Evaluation of Wettability of Solid Surface with Oil/ Refrigerant Mixture

Save this PDF as:
 WORD  PNG  TXT  JPG

Size: px
Start display at page:

Download "Evaluation of Wettability of Solid Surface with Oil/ Refrigerant Mixture"

Transcription

1 Purdue Unversty Purdue e-pubs Internatonal Compressor Engneerng Conference School of Mechancal Engneerng 16 Evaluaton of Wettablty of Sold Surface wth Ol/ Refrgerant Mxture Mtsuhro Fukuta Shzuoka Unversty, Japan, Junk Sumyama Graduate school of engneerng, Shzuoka Unversty, Masaak Motozawa Shzuoka Unversty, Japan, Akfum Hyodo Graduate school of engneerng, Shzuoka Unversty, Tadash Yanagsawa Shzuoka Unversty, Japan, Follow ths and addtonal works at: Fukuta, Mtsuhro; Sumyama, Junk; Motozawa, Masaak; Hyodo, Akfum; and Yanagsawa, Tadash, "Evaluaton of Wettablty of Sold Surface wth Ol/Refrgerant Mxture" (16). Internatonal Compressor Engneerng Conference. Paper Ths document has been made avalable through Purdue e-pubs, a servce of the Purdue Unversty Lbrares. Please contact for addtonal nformaton. Complete proceedngs may be acqured n prnt and on CD-ROM drectly from the Ray W. Herrck Laboratores at Herrck/Events/orderlt.html

2 54, Page 1 Evaluaton of Wettablty of Sold Surface wth Ol/Refrgerant Mxture Mtsuhro FUKUTA 1 *, Junk SUMIYAMA 2, Masaak MOTOZAWA 1 Akfum HYODO 2, Tadash YANAGISAWA 1 1 Shzuoka Unversty, Department of Mechancal Engneerng, Hamamatsu, Shzuoka, Japan , 2 Shzuoka Unversty, Graduate school of Engneerng, Hamamatsu, Shzuoka, Japan * Correspondng Author ABSTRACT In order to reduce an ol amount dscharged wth refrgerant from a refrgerant compressor, ol separaton from the refrgerant n a compressor shell or an ol separator has been nvestgated by many researchers. The ol separaton n the compressor shell or the separator strongly depends on droplet sze of ol mst generated n the compressor and condton of ol flm formed on an nner surface of the compressor shell or the separator. The ol mst dameter and generaton mechansm of the ol mst are affected by surface tenson of the ol, whle the condton of the ol flm on the nner surface s nfluenced by wettablty of the surface wth the ol. In addton, dssoluton of the refrgerant nto the ol changes the surface tenson and the wettablty of the surface. In ths study, the surface tenson of the ol/refrgerant mxture and the wettablty of the sold surface wth the ol/refrgerant mxture were examned as a frst step of the study on the generaton mechansm and the droplet behavor of the ol mst n the compressor. The surface tenson of PAG ol/co 2 mxture was measured by a pendant drop method and the wettablty of a PTFE sold surface wth the mxture was evaluated by measurng a contact angle. It s found that the surface tenson of the PAG/CO 2 mxture decreases steeply wth ncreasng the refrgerant concentraton n the ol. The droplet of the mxture keeps ts shape wth equlbrum condton on the PTFE plate. The contact angle on the PTFE surface decreases wth the refrgerant concentraton n the ol due to reducton of the surface tenson. 1. INTRODUCTION A part of lubrcaton ol stored n an ol sump of a refrgeraton compressor becomes fne ol mst n a compressor shell by motons of sldng parts and a dscharge valve, an entranment nduced by gas flow and rotaton of a motor rotor. Although some of the ol mst s separated from refrgerant n the compressor shell, a certan amount of the ol mst s dscharged wth refrgerant nto a refrgeraton cycle. The ol crculated wth refrgerant n the cycle degrades the heat transfer effcency of heat exchangers, ncreases pressure drop n lnes and the heat exchangers and sometmes reduces relablty of the compressor when an ol return from the cycle to the compressor s nsuffcent. It s therefore mportant to reduce the ol dscharge from the compressor to the cycle. There are many researches on the separaton of the ol mst n the compressor shell or an ol separator n a dscharge lne. The ol separaton n the compressor shell or the separator strongly depends on droplet sze of the ol mst generated n the compressor and condton of ol flm formed on an nner surface of the compressor shell or the separator. The ol mst dameter and generaton mechansm of the ol mst are affected by surface tenson of the ol, whle the condton of the ol flm on the nner surface s nfluenced by wettablty of the surface wth the ol. In addton, dssoluton of the refrgerant nto the ol changes the surface tenson and the wettablty of the surface. 23 rd Internatonal Compressor Engneerng Conference at Purdue, July 11-14, 16

3 54, Page 2 Weber number s nversely proportonal to the surface tenson and s one of the domnant parameters of lqud breakup (Majtha et al., 08; Sakura et al., 12). Khosharay and Varamnan (14) measured the surface tenson of (CH 4+H 2O), (C 2H 6+H 2O), (CO 2+H 2O) and (C 3H 8+H 2O) bnary system by a pendant drop method wth changng pressure and temperature. The surface tenson of the ol/refrgerant mxture was measured by Seeton and Hrnjak (06) by a maxmum bubble pressure method. Jensen and Jackman (1984) measured the surface tenson of the mxture by a rng method and proposed a correlaton between the surface tenson and the refrgerant concentraton. Fukuta (16) also measured the surface tenson of the mxture by the maxmum bubble pressure method under hgh temperature pressure condton. The condton of the ol flm formed on the sold surface affects the mst generaton due to the entranment by the flow. It s nfluenced by the wettablty of the surface wth the ol and the wettablty s evaluated by a contact angle of ol droplet on the surface. It s preferable that the contact angle of the ol on the nner wall of the compressor shell s small to avod the entranment of the ol mst by the gas flow. Vadgama and Harrs (07) measured a quas-statc advancng contact angle of refrgerant R134a on copper and alumnum surfaces by a drect optcal observaton technque where the lqud menscus at the surface of a vertcal plate was captured. It s shown that the contact angle vares between 8.3 and 5.6 for the alumnum and between 5.1 and 6.5 for the copper when the temperature rses from 0 C to 80 C. Ln et al. (16) nvestgated the wettng behavor of refrgerant-ol mxture on copper surface by the capllary rse method. They found that the protuberant lqud flm occurs n front of menscus durng evaporaton of the refrgerant-ol mxture, and the presence of ol sgnfcantly enhances the surface wettablty of refrgerant. In ths study, the surface tenson of the ol/refrgerant mxture and the wettablty of the sold surface wth the ol/refrgerant mxture are examned as a frst step of the study on the generaton mechansm and the droplet behavor of the ol mst n the compressor. The surface tenson of the ol/refrgerant mxture s measured by the pendant drop method that can be applcable to a pressurzed condton lke a refrgerant atmosphere. The contact angle of the mxture on the sold surface s measured by a Sessle Drop Method n parallel wth the surface tenson measurement. Polyalkylene glycol (PAG) ol and CO 2 are used as refrgeraton ol and refrgerant respectvely. As the test surface, polytetrafluoroethylene (PTFE) plate s used n the measurement of the contact angle of the mxture on the sold surface. 2. EXPERIMENT 2.1 Expermental Setup Fgure 1 shows a schematc of an expermental setup. A man vessel s desgned to wthstand pressure up to MPa. Two sght glasses are nstalled at opposte sdes of the man vessel. One s used to lght up an nsde of the vessel, and the other s used to take pctures of a droplet on a test plate. The ol/refrgerant mxture,.e. PAG/CO 2 mxture n ths study, s prepared n a sub vessel pror to the experment and fed to the man vessel by a gear pump. The PAG/CO 2 mxture flows through a capllary tube and the droplet drops from the tp of capllary tube on the test plate. Snce volume of the droplet n a Sessle Droplet Method s less than 4 μl, the capllary tube of 0.5 mm n outer dameter s used. The tp of the capllary tube s set at 5 mm above the test plate. The test plate s fxed on a rotary stage and the rotary stage s set on a thrust bearng. The rotary stage has two neodymum magnets on a sde of the stage. Ths confguraton allows us to rotate the test plate by operatng other magnets from outsde of the man vessel so that the measurement can be repeated at the same condton wth changng the droppng poston of the droplet by the rotaton of the test plate to confrm reproducblty. Polytetrafluoroethylene (PTFE) plate s used n ths study as the test plate. Refrgerant concentraton s measured by a samplng method. In the experment, the measurements of the contact angle, the surface tenson and the refrgerant concentraton of the mxture are carred out wth changng the pressure and the temperature of the PAG/CO 2 mxture. Purty of CO 2 used n ths experment s 99.95%. Vscosty grade of PAG used n ths study s 0 mm 2 /s at C. 2.2 Measurement of Contact Angle The contact angle of the mxture s measured by the Sessle Drop Method for the wettablty evaluaton. Fgure 2 shows a pcture of the droplet on the test plate taken by a CCD camera. The contact angle of the droplet s an angle between a horzontal lne and a tangental lne of the droplet at a contact pont of an edge of the droplet. The tangental lne s calculated by a curve fttng method. Frstly, detecton of droplet boundary s conducted 23 rd Internatonal Compressor Engneerng Conference at Purdue, July 11-14, 16

4 54, Page 3 by usng an mage processng software and x-y coordnates (x, y) of ponts on the boundary are obtaned. Then, an approxmaton curve of the droplet boundary s calculated by the curve fttng wth an assumpton that the shape of the droplet boundary s perfect crcle when the volume of the droplet s small. Equaton (1) s used to obtan the approxmaton curve of the boundary by a least square method wth dentfyng a coordnate of the center (a, b), and radus r of the crcle from the dscrete ponts on the boundary. 2 2a x 2b = x y a2 + b2 r 2 x x y x y y y ( ( x3 + x y2 x2 y + y3 2 2 x + y ( ) ) ) (1) The broken lne n Fgure 2 s the approxmaton curve obtaned by Equaton (1). The tangental lne at the contact pont s calculated from the approxmaton curve and the coordnate at the contact pont. The contact angle θ s obtaned from the angle between the horzontal lne and the tangental lne of the approxmaton curve at the contact pont. γs, γl, and γsl shown n Fgure 2 expresses a balance of surface tenson and nterfacal tenson, and are explaned n the followng secton. Fgure 1 Expermental setup of wettablty evaluaton Fgure 2 Measurement of contact angle 23rd Internatonal Compressor Engneerng Conference at Purdue, July 11-14, 16

5 54, Page Measurement of Surface Tenson Snce the surface tenson of lqud s closely related to the contact angle of the droplet on the sold surface, the surface tenson of the ol/refrgerant mxture s also measured by the pendant drop method n the same expermental setup shown n Fgure 1. Durng drppng the droplet from the capllary tube, the surface tenson of the droplet s calculated by the shape of the droplet when the dameter of the droplet becomes the maxmum. When the maxmum dameter of the droplet s de, and the dameter at the pont where the heght from the bottom of the droplet s equal to de s ds (see upper left n Fgure 3), the surface tenson of the droplet s calculated from Equaton (2). γ = J g ρ (d e )2 (2) where, γ s surface tenson, g s the gravtatonal acceleraton, ρ s densty of the ol/refrgerant mxture. J s a correlaton factor and calculated by the followng equaton (Fordham, 1948). J = x x x (x = d s / de ) (3) 3. EXPERIMENTAL RESULTS AND DISCUSSIONS 3.1 Contact Angle of Pure PAG on PTFE Plate The contact angle of pure PAG on the PTFE test plate s measured at frst. An observaton results of the droplet shape are shown n Fgure 3 when the droplet s drpped from the capllary tube and colldes aganst the plate. The temperature condton s kept to 60 C durng the experment. The heght from the plate to the capllary tube s set to 5 mm. Tme s zero when the droplet colldes wth the plate. The droplet shape changes from sphere to hem-sphere on the plate at an nstant of the collson. Then, t slghtly spreads and becomes equlbrum condton after 5 seconds from the collson. The contact angle at each moment s obtaned from the mages and tme hstory of the contact angle of the pure PAG on the PTFE plate s shown n Fgure 4. It s found that the contact angle decreases at the nstant of the collson wth the plate and becomes stable after 2 second after the collson. In the followng experment, the contact angle s measured by the mage taken at seconds after the collson. In addton, the surface tenson of the droplet can be measured by the pendant drop method as prevously explaned at the secton 2.3. Fgure 3 PAG Droplet drpped from capllary tube on PTFE plate 23rd Internatonal Compressor Engneerng Conference at Purdue, July 11-14, 16

6 54, Page 5 Fgure 5 shows the contact angle of PAG on the PTFE plate measured wth changng the temperature as a parameter. The contact angle s measured 5 tmes at each condton, and an average value s plotted aganst the temperature. The contact angle decreases wth ncreasng the temperature. Under the equlbrum condton, Young s formula expressed by Equaton (4) s establshed as shown n Fgure 2. γ = γ cos θ + γ (4) S L SL where, γ S s sold surface tenson, γ L s surface tenson of lqud phase, γ SL s sold-lqud nterfacal tenson, and θ s the contact angle. Accordng to Equaton (4), the contact angle depends on the lqud surface tenson f the soldlqud nterfacal tenson are assumed to be constant aganst the temperature snce the sold surface tenson hardly changes n ths temperature range. The surface tenson of PAG measured by the pendant drop method s shown n Fgure 6 aganst the temperature. It s shown that the surface tenson of PAG decreases wth ncreasng the temperature, and t causes the reducton of the contact angle shown n Fgure 5. Relatonshp between the surface tenson and the contact angle s shown n Fgure 7. It s found that the contact angle ncreases wth the surface tenson. Duple s equaton shown by the followng equaton expresses a work of C 70 Contact angle [ ] 60 PAG PTFE plate Tme [s] Fgure 4 Change of contact angle from collson Contact angle [ ] 60 PAG PTFE plate Temperature [ C] Fgure 5 Contact angle of PAG on PTFE versus temperature 23 rd Internatonal Compressor Engneerng Conference at Purdue, July 11-14, 16

7 54, Page 6 adheson, whch s the work per unt area requred to separate the drop from the sold surface. W = γ + γ γ (5) A s L SL The work of adheson s an ndex of the wettablty and t s ndcated that the wettablty becomes better wth large work of adheson. Wth consderng that the droplet of the PAG mantans ts shape on the PTFE plate wth equlbrum condton, Young-Duple equaton s derved from Equatons (4) and (5) as follows. W γ ( 1+ cosθ ) (6) A = L The work of adheson under the equlbrum condton s a functon of the surface tenson of lqud and the contact angle as expressed by Equaton (6). The work of adheson s obtaned by the surface tenson and the contact angle, and found to be 45.5 mj/m 2 [mn/m] when the surface tenson s 29 mn/m. As a reference value, the work of adheson of PTFE flm wth glycerol s shown to be 45.9 mn/m by Glman (14). The contact angle calculated by Equaton (6) wth an assumpton of constant work of adheson of 45.5 mn/m s shown n Fgure 7 by sold lne. Although the calculated contact angle shows the smlar tendency as the expermental one, gradent of the calculated contact angle s larger than expermental one. It may be caused by the fact that the work of adheson vares wth the Surface tenson [mn/m] PAG Temperature [ C] Fgure 6 Surface tenson of PAG versus temperature Contact angle [ ] PAG PTFE plate W A = 45.5 mj/m 2 Expermental value Calculated by Eq. (6) Surface tenson [mn/m] Fgure 7 Influence of surface tenson on contact angle (PAG on PTFE) 23 rd Internatonal Compressor Engneerng Conference at Purdue, July 11-14, 16

8 temperature. It s also supposed that contamnaton on the PTFE surface affects the wettng phenomena. 54, Page Contact Angle of PAG/CO2 Mxture on PTFE Plate The nfluence of refrgerant dssolved nto the ol on the contact angle s nvestgated. Fgure 8 shows the relatonshp between the mass fracton of CO 2 dssolved n the PAG and the surface tenson of the mxture measured by the pendant drop method at C. The surface tenson of the PAG/CO 2 mxture decreases steeply wth ncreasng the CO 2 concentraton n the mxture. The contact angle of the PAG/CO 2 mxture s shown n Fgure 9 aganst the CO 2 concentraton n the mxture. It s shown that the contact angle of the PAG/CO 2 mxture on the PTFE plate decreases wth ncreasng the CO 2 concentraton n the mxture due to the reducton of the surface tenson of the mxture. Therefore, t s supposed that the wettablty of the sold surface wth the PAG/CO 2 mxture havng hgh CO 2 concentraton becomes hgh. The contact angle s re-arranged aganst the surface tenson as shown n Fgure. When the surface tenson of the mxture becomes smaller than 22.5 mn/m, the contact angle calculated by Equaton (6) wth the work of adheson of 45.5 mj/m 2 becomes zero, whch means that the wettng becomes a perfect one n whch the droplet spreads and does not keep the droplet shape. In the experment, however, the droplet of the mxture wth the surface tenson of mn/m keeps the equlbrum contact angle. Ths dfference may be caused by the fact that the work of adheson s not constant. Contamnaton on the PTFE surface s another factor that affects PAG/CO 2 mxture C Surface tenson [mn/m] CO 2 concentraton [wt%] Fgure 8 Surface tenson of PAG/CO 2 mxture versus refrgerant concentraton PAG/CO 2 mxture PTFE plate C Contact angle [ ] CO 2 concentraton [wt%] Fgure 9 Influence of refrgerant concentraton on contact angle of PAG/CO 2 mxture on PTFE 23 rd Internatonal Compressor Engneerng Conference at Purdue, July 11-14, 16

9 54, Page PAG/CO 2 mxture PTFE plate C Contact angle [ ] 60 W A = 45.5 mj/m 2 Expermental value Calculated by Eq. (6) Surface tenson [mn/m] Fgure Contact angle of PAG/CO 2 mxture on PTFE versus surface tenson the wettng phenomena. Snce metal materals have much larger sold surface tenson or work of adheson than those of the PTFE, the wettng on the metal surface wth the ol/refrgerant mxture wll tend to be the perfect one. 4. CONCLUSIONS In ths study, the wettablty of sold surface wth ol/refrgerant mxture s evaluated expermentaly. The followng conclusons are obtaned 1. The expermental apparatus developed n ths study s applcable to measure the contact angle and the surface tenson of ol/refrgerant mxture under hgh pressure and temperature condton. 2. The droplet of pure PAG on the PTFE plate becomes equlbrum condton after 2 second from the collson wth the plate. The contact angle of the pure PAG on the PTFE plate decreases wth ncreasng temperature due to the reducton of the surface tenson of the PAG. 3. The droplet of PAG/CO 2 mxture keeps the droplet shape wth the equlbrum condton on the PTFE plate, and the contact angle decreases wth ncreasng the CO 2 concentraton n the mxture snce the surface tenson of the mxture steeply decreases wth ncreasng the CO 2 concentraton. 4. The wettng of the ol/refrgerant mxture on the metal surface s supposed to be the perfect one due to the much hgher sold surface tenson of the metal than that of the PTFE. REFERENCES Fordham, S. (1948). On the calculaton of surface tenson from measurements of pendant drops, Proceedngs of Royal socety of London, Volume194, A. Fukuta, M., Sumyama, J., Motozawa, M., Yanagsawa, T. (16). Surface tenson measurement of ol/refrgerant mxture by maxmum bubble pressure method. Int. J. Refrg., submtted. Glman, A., Pskarev, M., Yablokov, M., Kechek yan, A., Kuznetsov, A. (14). Adhesve propertes of PTFE modfed by DC dscharge. J. Physcs: Conference Seres, 516, rd Internatonal Compressor Engneerng Conference at Purdue, July 11-14, 16

10 54, Page 9 Jensen, M.K., Jackman, D.L. (1984). Predcton of nucleate pool bolng heat transfer coeffcents of refrgerant-ol mxtures. J. Heat Transfer, 6, Khosharay, S., Varamnan, F. (14). Expermental and modelng nvestgaton on surface tenson and surface propertes of (CH 4+H 2O), (C 2H 6+H 2O), (CO 2+H 2O) and (C 3H 8+H 2O) from K to K and pressures up to 60 bar. Int. J. Refrg., 47, Ln, L., Peng, H., Dng, G. (16). Influence of ol concentraton on wettng behavor durng evaporaton of refrgerant-ol mxture on copper surface, Int. J. Refrg., 61, Majtha, A.K., Hall, S., Bowen P.J. (08). Droplet breakup quantfcaton and processes n constant and pulsed arflows. Proceedngs of the 22 nd European Conference on Lqud Atomzaton and Spray System, ILASS Sakura, Y., Kobayash, K., Fujkawa, T., Sanada, T., Watanabe, M. (12). Observaton of deformaton of sngle droplet mpact on sold surface (Effects of lqud propertes, surface roughness and surroundng gas pressure). Japanese Journal of Multphase flow, Vol.26 No.2, (n Japanese) Seeton, C.J., Hrnjak, P. (06). Thermophyscal propertes of CO 2-lubrcant mxtures and ther affect on 2-phase flow n small channels (less than 1 mm). Proceedngs of the Internatonal Refrgeraton and Ar Condtonng Conference at Purdue, R170. Vadgama, B., Harrs, K. D. (07). Measurements of the contact angle between R134a and both alumnum and copper surfaces. Expermental Thermal and Flud Scence, 31, ACKNOWLEDGEMENT The densty measurement of the ol/refrgerant mxture was done wth help by Mr. Tatsuhro Suzuk, workng at DENSO corp., when he was a student at graduate school of engneerng, Shzuoka Unversty, and the authors would lke to apprecate for hs effort. 23 rd Internatonal Compressor Engneerng Conference at Purdue, July 11-14, 16

Mass Transfer of CO 2 into Water and Surfactant Solutions

Mass Transfer of CO 2 into Water and Surfactant Solutions Mass Transfer of CO 2 nto Water and Surfactant Solutons Rouhollah Farajzadeh, Al Barat, Harm A. Dell, Johannes Brunng, Pacell L.J. Ztha Delft Unversty of Technology, Department of Geotechnology, Mjnbouwstraat

More information

Aerator Performance in Reducing Phenomenon of Cavitation in Supercritical Flow in Steep Channel Bed

Aerator Performance in Reducing Phenomenon of Cavitation in Supercritical Flow in Steep Channel Bed Engneerng Internatonal Conference UNNES Conservaton 13 Proceedng Aerator Performance n Reducng Phenomenon of Cavtaton n Supercrtcal Flow n Steep Channel Bed Yer Sutopo 1, Bud Wgnyosukarto, Istarto, dan

More information

A comparison study on the deck house shape of high speed planing crafts for air resistance reduction

A comparison study on the deck house shape of high speed planing crafts for air resistance reduction csnak, 2014 Int. J. Nav. Archt. Ocean Eng. (2014) 6:867~875 http://dx.do.org/10.2478/ijnaoe-2013-0218 pissn: 2092-6782, eissn: 2092-6790 A comparson study on the deck house shape of hgh speed planng crafts

More information

Influence of Gas Density on Hydrodynamics in a Bubble Column

Influence of Gas Density on Hydrodynamics in a Bubble Column Smulaton and Optmzaton Chna Petroleum Processng and Petrochemcal Technology 01, Vol. 16, No. 1, pp 66-70 March 30, 01 Influence of Gas Densty on Hydrodynamcs n a Bubble Column Tang Xaojn; Hou Shuand; Zhang

More information

High Speed 128-bit BCD Adder Architecture Using CLA

High Speed 128-bit BCD Adder Architecture Using CLA Hgh Speed 128-bt BCD Archtecture Usng CLA J.S.V.Sa Prasanth 1, Y.Yamn Dev 2 PG Student [VLSI&ES], Dept. of ECE, Swamy Vvekananda Engneerng College, Kalavara, Andhrapradesh, Inda 1 Assstant Professor, Dept.

More information

Comparative Deterministic and Probabilistic Analysis of Two Unsaturated Soil Slope Models after Rainfall Infiltration

Comparative Deterministic and Probabilistic Analysis of Two Unsaturated Soil Slope Models after Rainfall Infiltration Jordan Journal of Cvl Engneerng, Volume 11, No. 1, 2017 Comparatve Determnstc and Probablstc Analyss of Two Unsaturated Sol Slope Models after Ranfall Infltraton Manoj Kr. Sahs 1) and Partha Pratm Bswas

More information

Proceedings of the ASME nd International Conference on Ocean, Offshore and Arctic Engineering OMAE2013 June 9-14, 2013, Nantes, France

Proceedings of the ASME nd International Conference on Ocean, Offshore and Arctic Engineering OMAE2013 June 9-14, 2013, Nantes, France Proceedngs of the ASME nd Internatonal Conference on Ocean, Offshore and Arctc Engneerng OMAE June 9-,, Nantes, France OMAE-6 ROLL DAMPING COEFFICIENTS ASSESSMENT AND COMPARISON FOR ROUND BILGE AND HARD

More information

Stability Analysis for the Design of 5000-Tonnes Offshore Work Barge

Stability Analysis for the Design of 5000-Tonnes Offshore Work Barge Internatonal Journal of Engneerng and echnology Volume No. 9, September, Stablty Analyss for the Desgn of 5-onnes Offshore Work arge Ntonye Samson a, Ezenwa Ogbonnaya b, uve Ejabefo a a Department of arne

More information

Evaluation of a Center Pivot Variable Rate Irrigation System

Evaluation of a Center Pivot Variable Rate Irrigation System Evaluaton of a Center Pvot Varable Rate Irrgaton System Ruxu Su Danel K. Fsher USDA-ARS Crop Producton Systems Research Unt, Stonevlle, Msssspp Abstrat: Unformty of water dstrbuton of a varable rate center

More information

Product Information. Gripper for small components MPG-plus 40

Product Information. Gripper for small components MPG-plus 40 Product Informaton MPG-plus 40 MPG-plus More powerful. Faster. Longer fngers. MPG-plus grpper for small components 2-fnger parallel grpper wth smooth roller gudes of the base jaws Feld of applcaton Grppng

More information

HUMAN POWER TECHNICAL JOURNAL OF THE IHPVA. Number 50 Spring 2000 $5.50 NUMBER 50, SPRING 2000

HUMAN POWER TECHNICAL JOURNAL OF THE IHPVA. Number 50 Spring 2000 $5.50 NUMBER 50, SPRING 2000 HUMAN POWER TECHNICAL JOURNAL OF THE IHPVA NUMBER 50, SPRING 000 Number 50 Sprng 000 $5.50 Summares of artcles n ths ssue; mast................ Contrbutons to Human Power....................... Artcles

More information

Mass Spectrometry. Fundamental GC-MS. GC-MS Interfaces

Mass Spectrometry. Fundamental GC-MS. GC-MS Interfaces Mass Spectrometry Fundamental GC-MS GC-MS Interfaces Wherever you see ths symbol, t s mportant to access the on-lne course as there s nteractve materal that cannot be fully shown n ths reference manual.

More information

Aalborg Universitet. CLIMA proceedings of the 12th REHVA World Congress Heiselberg, Per Kvols. Publication date: 2016

Aalborg Universitet. CLIMA proceedings of the 12th REHVA World Congress Heiselberg, Per Kvols. Publication date: 2016 Aalborg Unverstet CLIMA 2016 - proceedngs of the 12th REHVA World Congress Heselberg, Per Kvols Publcaton date: 2016 Document Verson Publsher's PDF, also known as Verson of record Lnk to publcaton from

More information

Product Information. Gripper for small components MPG 80

Product Information. Gripper for small components MPG 80 Product Informaton MPG 80 MPG Precse. Compact. Relable. MPG grpper for small components 2-fnger parallel grpper wth smooth roller gudes of the base jaws Feld of applcaton Grppng and movng of small to medum-szed

More information

Comparisons of Means for Estimating Sea States from an Advancing Large Container Ship

Comparisons of Means for Estimating Sea States from an Advancing Large Container Ship Downloaded from orbt.dtu.dk on: Jan 31, 18 Comparsons of Means for Estmatng Sea States from an Advancng Large Contaner Shp Nelsen, Ulrk Dam; Andersen, Ingrd Mare Vncent; Konng, Jos Publshed n: Proceedngs

More information

Risk analysis of natural gas pipeline

Risk analysis of natural gas pipeline Rsk analyss of natural gas ppelne Y.-D. Jo 1, K.-S. Park 1, J. W. Ko, & B. J. Ahn 3 1 Insttute of Gas Safety Technology, Korea Gas Safety Corporaton, South Korea Department of Chemcal Engneerng, Kwangwoon

More information

Equilibrium or Simple Rule at Wimbledon? An Empirical Study

Equilibrium or Simple Rule at Wimbledon? An Empirical Study Equlbrum or Smple Rule at Wmbledon? An Emprcal Study Shh-Hsun Hsu, Chen-Yng Huang and Cheng-Tao Tang Revson: March 2004 Abstract We follow Walker and Wooders (200) emprcal analyss to collect and study

More information

Contractor's Material and Test Certificate for Underground Piping

Contractor's Material and Test Certificate for Underground Piping UNDERGROUND PPNG 13-97 Contractors Materal and Test Certfcate for Underground Ppng PROCEDURE Upon completon of work, nspecton and tests shall be made by the contractors representatve and wtnessed by an

More information

Cross-shore Structure of Longshore Currents during Duck94

Cross-shore Structure of Longshore Currents during Duck94 CHAPTER 283 Cross-shore Structure of Longshore Currents durng Duck94 Falk Feddersen 1, R.T. Guza 2, Steve Elgar 3, and T.H.C Herbers 4 Abstract The cross-shore structure of the mean longshore current on

More information

SEAKEEPING BEHAVIOUR OF A FRIGATE-TYPE TRIMARAN

SEAKEEPING BEHAVIOUR OF A FRIGATE-TYPE TRIMARAN Desgn & Operaton of Trmaran Shps, London, UK SEAKEEPNG BEHAVOUR OF A FRGATE-TYPE TRMARAN W Pastoor, Det Norske Vertas AS, Norway R van 't Veer, Martme Research nsttute Netherlands, The Netherlands E Harmsen,

More information

English Premier League (EPL) Soccer Matches Prediction using An Adaptive Neuro-Fuzzy Inference System (ANFIS) for

English Premier League (EPL) Soccer Matches Prediction using An Adaptive Neuro-Fuzzy Inference System (ANFIS) for Englsh Premer League (EPL) Soccer Matches Predcton usng An Adaptve Neuro-Fuzzy Inference System (ANFIS) for Amadn, F. I 1 and Ob, J.C. 2 Department of Computer Scence, Unversty of Benn, Benn Cty. Ngera.

More information

Investigating Reinforcement Learning in Multiagent Coalition Formation

Investigating Reinforcement Learning in Multiagent Coalition Formation Investgatng Renforcement Learnng n Multagent Coalton Formaton Xn L and Leen-Kat Soh Department of Computer Scence and Engneerng Unversty of Nebrasa-Lncoln 115 Ferguson Hall, Lncoln, NE 66588-0115 {xnl,

More information

Safety Impact of Gateway Monuments

Safety Impact of Gateway Monuments *Manuscrpt Clck here to vew lnked References Ye, Venezano, and Lord 1 Safety Impact of Gateway Monuments Zhru Ye a,*, Davd Venezano a, Domnque Lord b a Western Transportaton Insttute, Montana State Unversty,

More information

First digit of chosen number Frequency (f i ) Total 100

First digit of chosen number Frequency (f i ) Total 100 1 4. ANALYSING FREQUENCY TABLES Categorcal (nomnal) data are usually summarzed n requency tables. Contnuous numercal data may also be grouped nto ntervals and the requency o observatons n each nterval

More information

LGWP & HC Refrigerants Solubility Tests Performed in Running Scroll Compressor

LGWP & HC Refrigerants Solubility Tests Performed in Running Scroll Compressor Purdue University Purdue e-pubs International Compressor Engineering Conference School of Mechanical Engineering 2016 LGWP & HC Refrigerants Solubility Tests Performed in Running Scroll Compressor Pierre

More information

PERFORMANCE AND COMPENSATION ON THE EUROPEAN PGA TOUR: A STATISTICAL ANALYSIS

PERFORMANCE AND COMPENSATION ON THE EUROPEAN PGA TOUR: A STATISTICAL ANALYSIS PERFORMANCE AND COMPENSATION ON THE EUROPEAN PGA TOUR: A STATISTICAL ANALYSIS C. Barry Pftzner and Chrs Spence, Department of Economcs/Busness, Randolph-Macon College, Ashland, VA, bpftzne@rmc.edu, cspence@rmc.edu

More information

ALASKA DEPARTMENT OF FISH AND GAME DIVISION OF COMMERCIAL FISHERIES NEWS RELEASE

ALASKA DEPARTMENT OF FISH AND GAME DIVISION OF COMMERCIAL FISHERIES NEWS RELEASE ALASKA DEPARTMENT OF FISH AND GAME DIVISION OF COMMERCIAL FISHERIES NEWS RELEASE Cora Campbell, Commssoner Jeff Regnart, Drector Contact: Cordova ADF&G Steve Mofftt, PWS Fnfsh Research Bologst 401 Ralroad

More information

arxiv: v1 [cs.ne] 3 Jul 2017

arxiv: v1 [cs.ne] 3 Jul 2017 Modelng preference tme n mddle dstance trathlons Iztok Fster, 1 Andres Iglesas, 2 Suash Deb, 3, 4 Dušan Fster, 5 and Iztok Fster Jr. 6 1 Unversty of Marbor, Faculty of Electrcal Engneerng and Computer

More information

WHOI MOORING OPERATIONS TECHNIQUES OF THE BUOY PROJECT AT THE WOODS HOLE OCEANOGRAPHIC INSTITUTION. Robert H. Heinmi11er, Jr.

WHOI MOORING OPERATIONS TECHNIQUES OF THE BUOY PROJECT AT THE WOODS HOLE OCEANOGRAPHIC INSTITUTION. Robert H. Heinmi11er, Jr. WHO-76-69 )' MOORNG OPERATONS TECHNQUES OF THE BUOY PROJECT AT THE WOODS HOLE OCEANOGRAPHC NSTTUTON by Robert H. Henm11er, Jr. ~" co ft co.. Õ ru :~ cr :: 3: c: c: == ld-,-c,. ft c: -C WOODS HOLE OCEANOGRAPHr'C

More information

MODEL : LDF7810WW/ LDF7810BB/ LDF7810ST LDF7811WW/LDF7811BB / LDF7811ST LDS5811WW/ LDS5811BB/ LDS5811ST LDF6810WW/LDF6810BB / LDF6810ST

MODEL : LDF7810WW/ LDF7810BB/ LDF7810ST LDF7811WW/LDF7811BB / LDF7811ST LDS5811WW/ LDS5811BB/ LDS5811ST LDF6810WW/LDF6810BB / LDF6810ST _/ / _ III IRL III" Dshwasher MODEL : LDF7810WW/ LDF7810BB/ LDF7810ST LDF7811WW/LDF7811BB / LDF7811ST LDS5811WW/ LDS5811BB/ LDS5811ST LDF6810WW/LDF6810BB / LDF6810ST Please read ths manual carefully Retan

More information

Response based sea state estimation for onboard DSS Safe and Efficient Marine Operations

Response based sea state estimation for onboard DSS Safe and Efficient Marine Operations Response based sea state estmaton for onboard DSS Safe and Effcent Marne Operatons Ulrk Dam Nelsen AMOS Workshop, NTNU, Trondhem, 13 th and 14 th November, 2014 Contents Introducton: Context Montorng and

More information

Algorithms of Digital Processing and the Analysis of Underwater Sonar Images

Algorithms of Digital Processing and the Analysis of Underwater Sonar Images 9 Algorthms of Dgtal Processng and the Analyss of Underwater Sonar Images S.V. Sa, A.G. Shoberg and L.A. Naumov 2 Pacfc natonal unversty 2 Insttute of Marne Technology Problems FEB RUS Russa Open Access

More information

COMPENSATING FOR WAVE NONRESPONSE IN THE 1979 ISDP RESEARCH PANEL

COMPENSATING FOR WAVE NONRESPONSE IN THE 1979 ISDP RESEARCH PANEL COMPENSATING FOR WAVE NONRESPONSE IN THE 1979 ISDP RESEARCH PANEL 1. Introducton Graham Kalton, Unversty of Mchgan ames Lepkowsk, Unversty of Mchgan Tng-Kwong Ln. Natonal Unversty of Sngapore The choce

More information

Planning of production and utility systems under unit performance degradation and alternative resource-constrained cleaning policies

Planning of production and utility systems under unit performance degradation and alternative resource-constrained cleaning policies 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 Plannng of producton and utlty systems under unt performance degradaton

More information

Autumn Antics Open Play Day Horse Show

Autumn Antics Open Play Day Horse Show Slver Knolls Spurs 4-H Club Presents The Twenty Frst Annual Autumn Antcs Open Play Day Horse Show Saturday, October 7, 2017 Start Tme: 9:00 AM UNR Equestran Center 1290 Valley Rd, Reno, NV 89512 Corner

More information

Modeling the Performance of a Baseball Player's Offensive Production

Modeling the Performance of a Baseball Player's Offensive Production Brgham Young Unversty BYU ScholarsArchve All Theses and Dssertatons 006-03-09 Modelng the Performance of a Baseball Player's Offensve Producton Mchael Ross Smth Brgham Young Unversty - Provo Follow ths

More information

Chinese and foreign men s decathlon performance comparison and structural factor correlation test based on SPSS regression model

Chinese and foreign men s decathlon performance comparison and structural factor correlation test based on SPSS regression model ISSN : 0974-7435 Volume 10 Issue 3 Chnese and foregn men s decathlon performance comparson and structural factor correlaton test based on SPSS regresson model Pengfe Zhang*, Jngjng Lu Insttute of Physcal

More information

FK240 FLAT SOLAR COLLECTORS ROOF-TOP INSTALLATION FOR WORCESTER SOLAR SYSTEMS

FK240 FLAT SOLAR COLLECTORS ROOF-TOP INSTALLATION FOR WORCESTER SOLAR SYSTEMS FK240 FLAT SOLAR COLLECTORS ROOF-TOP INSTALLATION FOR WORCESTER SOLAR SYSTEMS G INSTALLATION INSTRUCTIONS About ths manual Ths nstallaton manual contans mportant nformaton for the safe and approprate nstallaton

More information

AMP-O-MATIC* Side-Feed Stripper-Crimper III Machine No [ ] customer manual TOOLING ASSISTANCE CENTER

AMP-O-MATIC* Side-Feed Stripper-Crimper III Machine No [ ] customer manual TOOLING ASSISTANCE CENTER AMP-O-MATIC* Sde-Feed Strpper-Crmper III Machne No. 1320895-[ ] Customer Manual 409-10012 28 DEC 11 SAFETY A. PRECAUTIONS READ THIS FIRST!............................ 2 customer manual 1. INTRODUCTION.......................................................

More information

BICYCLE MANUAL ROAD BIKE

BICYCLE MANUAL ROAD BIKE PURE CYCLING BICYCLE MANUAL ROAD BIKE 1 13 14 2 3 4 5 c a 15 16 17 6 7 8 9 10 11 12 e d b 18 19 20 21 22 23 24 25 Attenton! Assembly nstructons page 10. Before your frst rde please read pages 5-9.! Your

More information

Hydraulic DTH Fluid Hammer Drilling as a Seismic While Drilling (SWD) Source for Geothermal Exploration and Drilling Prediction

Hydraulic DTH Fluid Hammer Drilling as a Seismic While Drilling (SWD) Source for Geothermal Exploration and Drilling Prediction Proceedngs World Geothermal Congress 2015 Melbourne, Australa, 19-25 Aprl 2015 Hydraulc DTH Flud Hammer Drllng as a Sesmc Whle Drllng (SWD) Source for Geothermal Exploraton and Drllng Predcton Poletto

More information

Standard Bourdon tube pressure gauges EN 837-1

Standard Bourdon tube pressure gauges EN 837-1 Bourdon tube Pressure gauges Standard Bourdon tube pressure gauges EN 837-1 For pneumatc and heatng system applcatons (e. g. pressure reducers, water flters) Desgn as per EN 837-1 Accuracy class 1.6 Corroson-resstant,

More information

Power Generation Scheduling of Thermal Units Considering Gas Pipelines Constraints

Power Generation Scheduling of Thermal Units Considering Gas Pipelines Constraints World Academy of Scence, Engneerng and Technology Internatonal Journal of Electrcal and Computer Engneerng Vol:3, No:1, 29 ower Generaton Schedulng of Thermal Unts Consderng Gas pelnes Constrants Sara

More information

PERFORMANCE AND CHARACTERISTICS OF COMPRESSOR/EXPANDER COMBINATION FOR CO 2 CYCLE ABSTRACT

PERFORMANCE AND CHARACTERISTICS OF COMPRESSOR/EXPANDER COMBINATION FOR CO 2 CYCLE ABSTRACT PERFORMANCE AND CHARACTERISTICS OF COMPRESSOR/EXPANDER COMBINATION FOR CO 2 CYCLE M. FUKUTA, T. YANAGISAWA, S. NAKAYA (b), and Y. OGI Shizuoka University, 3-5-1 Johoku Hamamatsu, 432-8561, Japan Fax +81-53-478-158,

More information

Instrumentation. Pumps Valves Instrumentation

Instrumentation. Pumps Valves Instrumentation Instrumentaton Pumps Valves Instrumentaton Standards n perfecton and safety ASV Stübbe s an nternatonal manufacturer of pumps, valves, nstrumentaton and control systems made of thermoplastcs. As a system

More information

2018 GIRLS DISTRICT-SPECIFIC PLAYER DEVELOPMENT GUIDE

2018 GIRLS DISTRICT-SPECIFIC PLAYER DEVELOPMENT GUIDE 2018 GIRLS DISTRICT-SPECIFIC PLAYER DEVELOPMENT GUIDE GENERAL OVERVIEW USA Hockey Grls Player Development Dstrct-Specfc Gude The USA Hockey Grls Player Development Dstrct-Specfc Gude outlnes the 2018 grls

More information

Development of Large Capacity CO2 Scroll Compressor

Development of Large Capacity CO2 Scroll Compressor Purdue University Purdue e-pubs International Compressor Engineering Conference School of Mechanical Engineering 2008 Development of Large Capacity CO2 Scroll Compressor Kenji Yano Mitsubishi Electric

More information

Scroll Compressor Operating Envelope Considerations

Scroll Compressor Operating Envelope Considerations Purdue University Purdue e-pubs International Compressor Engineering Conference School of Mechanical Engineering 1992 Scroll Compressor Operating Envelope Considerations M. J. Maertens Tecumseh Products

More information

Domain Decomposition Method for 3-Dimensional Simulation of the Piston Cylinder Section of a Hermetic Reciprocating Compressor

Domain Decomposition Method for 3-Dimensional Simulation of the Piston Cylinder Section of a Hermetic Reciprocating Compressor Purdue University Purdue e-pubs International Compressor Engineering Conference School of Mechanical Engineering 2006 Domain Decomposition Method for 3-Dimensional Simulation of the Piston Cylinder Section

More information

ASSEMBLY INSTRUCTIONS. TECHART roof spoiler

ASSEMBLY INSTRUCTIONS. TECHART roof spoiler Part no. 070.100.650.009 Roof spoler Contents I Important safety nformaton...3 II Preparaton...5 III Installaton...6 1 Preparng the vehcle...6 2 Fttng the...6 3 Fnal nspecton...6 TECHART Verson 01 Page

More information

Major League Duopolists: When Baseball Clubs Play in Two-Team Cities. Phillip Miller. Department of Economics. Minnesota State University, Mankato

Major League Duopolists: When Baseball Clubs Play in Two-Team Cities. Phillip Miller. Department of Economics. Minnesota State University, Mankato Major League Duopolsts: When Baseball Clubs Play n Two-Team Ctes Phllp Mller Department of Economcs Mnnesota State Unversty, Mankato September 2006 Abstract: Ths paper focuses on examnng the attendance

More information

COMPARATIVE ANALYSIS OF WAVE WEATHER WINDOWS IN OPERATION AND MAINTENANCE OF OFFSHORE WIND FARMS AT HSINCHU AND CHANGHUA, TAIWAN

COMPARATIVE ANALYSIS OF WAVE WEATHER WINDOWS IN OPERATION AND MAINTENANCE OF OFFSHORE WIND FARMS AT HSINCHU AND CHANGHUA, TAIWAN Journal of Marne Scence and Technology, Vol. 5, No. 5, pp. 563-570 (07) 563 DOI: 0.69/JMST-07-0703- COMPARATIVE ANALYSIS OF WAVE WEATHER WINDOWS IN OPERATION AND MAINTENANCE OF OFFSHORE WIND FARMS AT HSINCHU

More information

2017 GIRLS DISTRICT-SPECIFIC PLAYER DEVELOPMENT GUIDE

2017 GIRLS DISTRICT-SPECIFIC PLAYER DEVELOPMENT GUIDE 2017 GIRLS DISTRICT-SPECIFIC PLAYER DEVELOPMENT GUIDE GENERAL OVERVIEW USA Hockey Grls Player Development Dstrct-Specfc Gude The USA Hockey Grls Player Development Dstrct-Specfc Gude outlnes the 2017 grls

More information

Propagation of Big Island eddies

Propagation of Big Island eddies JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 106, NO. C1, PAGES 935-944, JANUARY 15, 2001 Propagaton of Bg Island eddes Chrstna L. Holland and Gary T. Mtchum College of Marne Scence, Unversty of South Florda,

More information

CAREER DURATION IN THE NHL: PUSHING AND PULLING ON EUROPEANS?

CAREER DURATION IN THE NHL: PUSHING AND PULLING ON EUROPEANS? UNC CHARLOTTE ECONOMICS WORKING PAPER SERIES CAREER DURATION IN THE NHL: PUSHING AND PULLING ON EUROPEANS? Crag A. Depken II Johnny Duckng Peter A. Groothus Workng Paper No. 2016-005 THE UNIVERSITY OF

More information

Gas Vapor Injection on Refrigerant Cycle Using Piston Technology

Gas Vapor Injection on Refrigerant Cycle Using Piston Technology Purdue University Purdue e-pubs International Refrigeration and Air Conditioning Conference School of Mechanical Engineering 2012 Gas Vapor Injection on Refrigerant Cycle Using Piston Technology Sophie

More information

IBIS: ATestbed for the Evolution of Intelligent Broadband Networks toward TINA

IBIS: ATestbed for the Evolution of Intelligent Broadband Networks toward TINA BS: ATestbed for the Evoluton of ntellgent Broadband Networks toward TNA Marc0 Lstant, Unversty of Roma "La Sapenza" Stefan0 Salsano, CoRTeL ABSTRACT Ths artcle analyzes a possble path for the evoluton

More information

SCIENTIFIC COMMITTEE THIRTEENTH REGULAR SESSION. Rarotonga, Cook Islands 9-17 August, 2017

SCIENTIFIC COMMITTEE THIRTEENTH REGULAR SESSION. Rarotonga, Cook Islands 9-17 August, 2017 SCIENTIFIC COMMITTEE THIRTEENTH REGULAR SESSION Rarotonga, Cook Islands 9-17 August, 2017 Relatve abundance of yellowfn tuna for the purse sene and handlne fsheres operatng n the Phlppnes Moro Gulf (Regon

More information

Multi-Criteria Decision Tree Approach to Classify All-Rounder in Indian Premier League

Multi-Criteria Decision Tree Approach to Classify All-Rounder in Indian Premier League Internatonal Journal of Adanced Scence and Technology Mult-Crtera Decson Tree Approach to Classfy All-Rounder n Indan Premer League Pabtra Kumar Dey 1, Dpendra Nath Ghosh 2, Abhoy Chand Mondal 3 1 Assstant

More information

Quantitative gas saturation estimation by frequencydependent

Quantitative gas saturation estimation by frequencydependent Quanttatve gas saturaton estmaton by requencydependent AVO analyss Xaoyang Wu, * Mark Chapman, Xang-Yang L, and Patrck Boston Ednburgh Ansotropy Project, Brtsh Geologcal Survey, Murchson House, West Mans

More information

Experimental Testing and Model Validation for Ocean Wave Energy Harvesting Buoys

Experimental Testing and Model Validation for Ocean Wave Energy Harvesting Buoys Expermental Tetng and Model Valdaton for Ocean Wave Energy Harvetng Buoy Dougla A. Gemme 1, Steven P. Baten 1, Raymond B. Sepe, Jr. 1, John Montgomery 2, Stephan T. Grll 2, Annette Grll 2 1 Electro Standard

More information

The Apportioning of Port Areas Between Suction and Discharge Valves in Reciprocating Compressors

The Apportioning of Port Areas Between Suction and Discharge Valves in Reciprocating Compressors Purdue University Purdue e-pubs nternational Compressor Engineering Conference School of Mechanical Engineering 1982 The Apportioning of Port Areas Between Suction and Discharge Valves in Reciprocating

More information

Valuing Beach Quality with Hedonic Property Models

Valuing Beach Quality with Hedonic Property Models Valung Beach Qualty wth Hedonc Property Models Crag E. Landry* Department of Economcs Center for Natural Hazards Research East Carolna Unversty, Greenvlle, NC 27858 landryc@ecu.edu; 252-328-6383 and Paul

More information

Cost theory and the cost of substitution a clarification

Cost theory and the cost of substitution a clarification Cost theory and the cost of substtuton a clarfcaton Walter J. ReMne The cost of substtuton has been wdely msnterpreted, whch has lmted ts utlty. Ths paper clarfes the cost concept and re-establshes ts

More information

Introduction Match analysis is used to investigate technical and tactical behaviors within judo studies, and it can also be applied to improve

Introduction Match analysis is used to investigate technical and tactical behaviors within judo studies, and it can also be applied to improve Introducton Match analyss s used to nvestgate techncal and tactcal behavors wthn judo studes, and t can also be appled to mprove athletc performance. Ths type of data can be used n a varety of means to

More information

Predicting the Suction Gas Superheating in Reciprocating Compressors

Predicting the Suction Gas Superheating in Reciprocating Compressors Purdue University Purdue e-pubs International Compressor Engineering Conference School of Mechanical Engineering 2014 Predicting the Suction Gas Superheating in Reciprocating Compressors Jonatas Ferreira

More information

Evaluating the Effectiveness of Price and Yield Risk Management Products in Reducing. Revenue Risk for Southeastern Crop Producers * Todd D.

Evaluating the Effectiveness of Price and Yield Risk Management Products in Reducing. Revenue Risk for Southeastern Crop Producers * Todd D. Evaluatng the Effectveness of Prce and Yeld Rsk Management Products n Reducng Revenue Rsk for Southeastern Crop Producers * Todd D. Davs ** Abstract A non-parametrc smulaton model ncorporatng prce and

More information

Performance Analysis of Centrifugal Compressor under Multiple Working Conditions Based on Time-weighted Average

Performance Analysis of Centrifugal Compressor under Multiple Working Conditions Based on Time-weighted Average Purdue University Purdue e-pubs International Compressor Engineering Conference School of Mechanical Engineering 2014 Performance Analysis of Centrifugal Compressor under Multiple Working Conditions Based

More information

Development of a High Pressure, Oil Free, Rolling Piston Compressor

Development of a High Pressure, Oil Free, Rolling Piston Compressor Purdue University Purdue e-pubs International Compressor Engineering Conference School of Mechanical Engineering 1994 Development of a High Pressure, Oil Free, Rolling Piston Compressor S. J. Delmotte

More information

IDENTIFICATION OF TRANSPORTATION IMPROVEMENT PROJECTS IN PHNOM PENH CONSIDERING TRAFFIC CONGESTION LEVEL

IDENTIFICATION OF TRANSPORTATION IMPROVEMENT PROJECTS IN PHNOM PENH CONSIDERING TRAFFIC CONGESTION LEVEL Proceedngs of the Eastern Asa Socety for Transportaton Studes, Vol. 5, pp. 1265-1280, 2005 IDENTIFICATION OF TRANSPORTATION IMPROVEMENT PROJECTS IN PHNOM PENH CONSIDERING TRAFFIC CONGESTION LEVEL Sambath

More information

CIVL Paragliding and Hang-Gliding Committees CIVL GAP. Centralised Cross-Country Competition Scoring for Hang-Gliding and Paragliding

CIVL Paragliding and Hang-Gliding Committees CIVL GAP. Centralised Cross-Country Competition Scoring for Hang-Gliding and Paragliding CIVL Paragldng and Hang-Gldng Commttees CIVL GAP Centralsed Cross-Country Cometton Scorng for Hang-Gldng and Paragldng 2014 Edton Revson 1.1 Publshed March 23, 2014 CIVL GAP Centralsed Cross-Country Cometton

More information

Chapter 3 Reserve Estimation. Lecture notes for PET 370 Spring 2012 Prepared by: Thomas W. Engler, Ph.D., P.E.

Chapter 3 Reserve Estimation. Lecture notes for PET 370 Spring 2012 Prepared by: Thomas W. Engler, Ph.D., P.E. Chapter 3 Reserve Estmaton Lecture notes for PET 370 prng 2012 Prepared by: Thomas W. Engler, Ph.D., P.E. Volumetrc N ol n 7758A B o place, n h f (1 1 ) here, N = ol n place, stb A = dranage area, acres

More information

An Enforcement-Coalition Model: Fishermen and Authorities forming Coalitions. Lone Grønbæk Kronbak Marko Lindroos

An Enforcement-Coalition Model: Fishermen and Authorities forming Coalitions. Lone Grønbæk Kronbak Marko Lindroos An Enforcement-Coalton Model: Fshermen and Authortes formng Coaltons Lone Grønbæ Kronba Maro Lndroos December 003 All rghts reserved. No part of ths WORKING PAPER may be used or reproduced n any manner

More information

Comparison of volume controlled with pressure controlled ventilation during one-lung anaesthesia

Comparison of volume controlled with pressure controlled ventilation during one-lung anaesthesia Brtsh Journal of Anaesthesa 1997; 79: 306 310 Comparson of volume controlled wth pressure controlled ventlaton durng one-lung anaesthesa M. TUĞRUL, E. ÇAMCI, H. K ARADENI Z, M. ŞENTÜRK, K. PEMBECI AND

More information

Engineering Flettner Rotors to Increase Propulsion

Engineering Flettner Rotors to Increase Propulsion Engineering Flettner Rotors to Increase Propulsion Author: Chance D. Messer Mentor: Jeffery R. Wehr Date: April 11, 2016 Advanced STEM Research Laboratory, Odessa High School, 107 E 4 th Avenue, Odessa

More information

Scroll Compressor Performance With Oil Injection/Separation

Scroll Compressor Performance With Oil Injection/Separation Purdue University Purdue e-pubs nternational Compressor Engineering Conference School of Mechanical Engineering 1996 Scroll Compressor Performance With Oil njection/separation R. T. Drost United Technologies

More information

Axial and Radial Force Control for CO2 Scroll Expander

Axial and Radial Force Control for CO2 Scroll Expander Purdue University Purdue e-pubs International Compressor Engineering Conference School of Mechanical Engineering 28 Axial and Radial orce Control for CO2 Scroll Expander Akira Hiwata Akira Ikeda Takashi

More information

Lubrication of Screw Compressor Bearings in the Presence of Refrigerants

Lubrication of Screw Compressor Bearings in the Presence of Refrigerants Purdue University Purdue e-pubs International Compressor Engineering Conference School of Mechanical Engineering 1994 Lubrication of Screw Compressor Bearings in the Presence of Refrigerants B. Jacobson

More information

Development of High Efficiency 4K Two-Stage Pulse Tube Cryocooler

Development of High Efficiency 4K Two-Stage Pulse Tube Cryocooler Development of High Efficiency 4K Two-Stage Pulse Tube Cryocooler M. Xu, H. Takayama and K. Nakano Sumitomo Heavy Industries, Ltd. Nishi-tokyo-city, Tokyo, Japan 188-8585 ABSTRACT Sumitomo Heavy Industries

More information

2, ELEMENTS IN THE ABOVE TYPICAL SECTION MAY BE DELETED WHERE THEY ARE NOT REQUIRED AND

2, ELEMENTS IN THE ABOVE TYPICAL SECTION MAY BE DELETED WHERE THEY ARE NOT REQUIRED AND ROAD EASEMENT (see NOTE 7) LL ot L ol l-lo 10' 't2' 12' 8 Fl(J 10' tl ot ol o- ûa BORDER OR SDEWALK (see NOTE 2) PARKNG (see NOTE 2) - 2k% \EHCLE ES (see NOTE 6 i q SEE NOTE 4 2%% + FNSHED GROUND L 5 1

More information

NSPAA SLOW PITCH SOFTBALL POLICY AND PROCEDURES HANDBOOK

NSPAA SLOW PITCH SOFTBALL POLICY AND PROCEDURES HANDBOOK NSPAA SLOW PITCH SOFTBALL POLICY AND PROCEDURES HANDBOOK Revsed January 1, 2017 The Slow Ptch Softball Board (upon approval by the NSPAA Board) reserves the rght to edt, modfy, or change any polcy and/or

More information

CAUTION When using any equipment, always follow the manufacturer s instructions for safe operation.

CAUTION When using any equipment, always follow the manufacturer s instructions for safe operation. Cleanng 3M Controltac Decorated Graphc Vnyl Awnng Flmand Sgn Facngs Instructon Bulletn 6.1 Release I, Effectve March 2017 (replaces H, Oct 03) These cleanng nstructons are furnshed as a gude. The end-user

More information

Wind loads investigations of HAWT with wind tunnel tests and site measurements

Wind loads investigations of HAWT with wind tunnel tests and site measurements loads investigations of HAWT with wind tunnel tests and site measurements Shigeto HIRAI, Senior Researcher, Nagasaki R&D Center, Technical Headquarters, MITSUBISHI HEAVY INDSUTRIES, LTD, Fukahori, Nagasaki,

More information

OCCASIONAL PAPER SERIES

OCCASIONAL PAPER SERIES OCCASIONAL PAPER SERIES NO. 4 / DECEMBER 5 WHAT DOES EUROPEAN INSTITUTIONAL INTEGRATION TELL US ABOUT TRADE INTEGRATION? by Francesco Paolo Mongell, Ettore Dorrucc and Ita Agur OCCASIONAL PAPER SERIES

More information

Figure 1 Schematic of opposing air bearing concept

Figure 1 Schematic of opposing air bearing concept Theoretical Analysis of Opposing Air Bearing Concept This concept utilizes air bearings to constrain five degrees of freedom of the optic as shown in the figure below. Three pairs of inherently compensated

More information

Determination of the Optimal Pressure Support Level Evaluated by Measuring Transdiaphragmatic Pressure*

Determination of the Optimal Pressure Support Level Evaluated by Measuring Transdiaphragmatic Pressure* Determnaton of the Optmal Pressure Support Level Evaluated by Measurng Transdaphragmatc Pressure* 'Iomomasa Kmura, M.D.;t [un Takezawa, M.D., F.C.C.P;+ Kmtosh Nshwak, M.D.;t and Yasuhro Shmada, M ~ D F.C.C.R.,

More information

Two-Stage Linear Compressor with Economizer Cycle Where Piston(s) Stroke(s) are Varied to Optimize Energy Efficiency

Two-Stage Linear Compressor with Economizer Cycle Where Piston(s) Stroke(s) are Varied to Optimize Energy Efficiency Purdue University Purdue e-pubs International Compressor Engineering Conference School of Mechanical Engineering 2006 Two-Stage Linear Compressor with Economizer Cycle Where Piston(s) Stroke(s) are Varied

More information

By BETTY DEBNAM. All About Japan. Many tourists visit Mount Fuji, Japan's highest mountain.

By BETTY DEBNAM. All About Japan. Many tourists visit Mount Fuji, Japan's highest mountain. 4-1 (98) Especally and for famles ther e 1998 by Unversal Press Syndcate By BETTY DEBNAM from The Mn Page by Betty Debnam @1998 Unversal Press Syndcate The Host Country of the Wnter Olympcs All About Japan

More information

AN ISOLATED SMALL WIND TURBINE EMULATOR

AN ISOLATED SMALL WIND TURBINE EMULATOR AN ISOLATED SMALL WIND TURBINE EMULATOR Md. Arifujjaman Graduate Student Seminar: Master of Engineering Faculty of Engineering and Applied Science Memorial University of Newfoundland St. John s, NL, Canada

More information

Influence of the Main Parameters of the Suction Valve on the Overall Performance of a Small Hermetic Reciprocating Compressor

Influence of the Main Parameters of the Suction Valve on the Overall Performance of a Small Hermetic Reciprocating Compressor Purdue University Purdue e-pubs International Compressor Engineering Conference School of Mechanical Engineering 8 Influence of the Main Parameters of the Suction Valve on the Overall Performance of a

More information

By BETTY DEBNAM. In-Line Skating

By BETTY DEBNAM. In-Line Skating 49- (94) Especally for and famles ther e I 994 by Unversal Press Syndcate By BETTY DEBNAM from The Mn Page by Betty Debnam 994 Unversal Press Syndcate In. It'S In, In,., In-Lne Skatng In-lne skatng s the

More information

Offensive Strategy in the 2D Soccer Simulation League Using Multi-group Ant Colony Optimization

Offensive Strategy in the 2D Soccer Simulation League Using Multi-group Ant Colony Optimization Internatona Journa of Advanced Robotc Systems ARTICLE Offensve Strategy n 2D Soccer Smuaton League Usng Mut-group Ant Coony Optmzaton Reguar Paper Shengbng Chen *, Gang Lv Xaofeng Wang Key Lab of Network

More information

Minimum Viscosity for Bearing Reliability in Rotary Compressors

Minimum Viscosity for Bearing Reliability in Rotary Compressors Purdue University Purdue e-pubs nternational Compressor Engineering Conference School of Mechanical Engineering 1998 Minimum Viscosity for Bearing Reliability in Rotary Compressors P. Bushnell Carrier

More information

Municipal solid waste and dung cake burning: discoloring the Taj Mahal and human health impacts in Agra

Municipal solid waste and dung cake burning: discoloring the Taj Mahal and human health impacts in Agra Envronmental Research Letters LETTER OPEN ACCESS Muncpal sold waste and dung cake burnng: dscolorng the Taj Mahal and human health mpacts n Agra To cte ths artcle: Raj M Lal et al Envron. Res. Lett. 00

More information

Minimum Viscosity for Bearing Reliability in R290 Rotary Compressors

Minimum Viscosity for Bearing Reliability in R290 Rotary Compressors Purdue University Purdue e-pubs International Compressor Engineering Conference School of Mechanical Engineering 2012 Minimum Viscosity for Bearing Reliability in R290 Rotary Compressors Xingbiao Zhou

More information

LOW PRESSURE EFFUSION OF GASES adapted by Luke Hanley and Mike Trenary

LOW PRESSURE EFFUSION OF GASES adapted by Luke Hanley and Mike Trenary ADH 1/7/014 LOW PRESSURE EFFUSION OF GASES adapted by Luke Hanley and Mike Trenary This experiment will introduce you to the kinetic properties of low-pressure gases. You will make observations on the

More information

By Syed Ahmed Amin Shah 4 th semester Class No 8 Submitted To Engr. Saeed Ahmed

By Syed Ahmed Amin Shah 4 th semester Class No 8 Submitted To Engr. Saeed Ahmed EXPERIMENT # 01 DEMONSTRATION OF VARIOUS PARTS OF HYDRAULIC BENCH. HYDRAULIC BENCH Hydraulic bench is a very useful apparatus in hydraulics and fluid mechanics it is involved in majority of experiments

More information

Chemical behaviour of hydrophobic micro - pollutants during the melting of snow

Chemical behaviour of hydrophobic micro - pollutants during the melting of snow Modellng Snowmelt-Induced Processes (Proceedngs of the Budapest Symposum, July 986). IAHS Publ. no. 55,986. Chemcal behavour of hydrophobc mcro - pollutants durng the meltng of snow NORBERT SIMMLEIT* Insttut

More information

Small Variable Speed Hermetic Reciprocating Compressors for Domestic Refrigerators

Small Variable Speed Hermetic Reciprocating Compressors for Domestic Refrigerators Purdue University Purdue e-pubs International Compressor Engineering Conference School of Mechanical Engineering 1996 Small Variable Speed Hermetic Reciprocating Compressors for Domestic Refrigerators

More information

Peace Economics, Peace Science and Public Policy

Peace Economics, Peace Science and Public Policy Peace Economcs, Peace Scence and Publc Polcy Volume 17, Issue 1 2011 Artcle 1 Lone Wolf Terrorsm Peter J. Phllps Unversty of Southern Queensland, phllpsp@usq.edu.au Copyrght c 2011 Berkeley Electronc Press.

More information