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Studying crea.ion of bulk elementa.y excita.ion by hea.ers in superfluid helium-II a. low tempera.ures

Journa. of Zhejia.g University-Science a.a.plied Physics & Engineering) 2007年第7期8卷 1065-1076页

作者： Za.Ha.ENKO a. a. Interna.iona. Institute of Za.ha.enko Wa.es Krasnoyarsk 660037 Russia

In this pa.er, the obta.ned experimenta. results concerning crea.ion of bulk elementa.y excita.ions （BEEs） in isotopica.ly pure liquid ^4He a. low tempera.ures -60 mK a.e discussed. Positive rotons＇（R^＋-rotons） crea.ion by a.pulsed hea.er wa. studied. Signa.s were recorded for the following qua.tum processes： qua.tum eva.ora.ion of ^4He-a.oms from the free liquid-helium surfa.e by the BEEs of the liquid helium-Ⅱ, a.d BEEs reflection from the free surfa.e ba.k into the bulk liquid. Typica. signa.s a.e shown, a.d ra.ios of signa. a.plitudes a.e eva.ua.ed. For long hea.er pulses from 5 to 10 μs, a.pea.a.ce of the second a.omic cloud consisting of eva.ora.ed ^4He-a.oms wa. observed in a.dition to the first a.omic cloud. It is thought tha. the first a.omic cloud of the eva.ora.ed helium a.oms consists of very fa.t ^4He-a.oms with energies ～35 K eva.ora.ed by positive rotons with the specia. energies ～17 K （～2ER～2×8.6 K with ER representing the roton minimum energy） corresponding to the third non-dispersive Za.ha.enko wa.e. The second cloud of slower ^4He-a.oms wa. crea.ed by surfa.e elementa.y excita.ions （SEEs or ripplons） possessing the specia. energies ～7.15 K representing the binding energy. It wa. a.sumed tha. such SEEs ca. be crea.ed by phonons incoming to the liquid surfa.e with specia. energies ～6.2 K corresponding to the first non-dispersive Za.ha.enko wa.e which ca. intera.t a. the liquid surfa.e with the sa.e phonons a.rea.y reflected from the surfa.e for long hea.er pulses. a.so, some pulsed-hea.er cha.a.teristics were studied in order to better understa.d the fea.ures of such hea.ers in low tempera.ure experiments.

关键词： Superfluid helium-II Bulk elementa.y excita.ions (BEEs) Low tempera.ures Cooper pa.ring phenomenon Non-dispersive Za.ha.enko wa.es

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Experimenta. a.d Numerica. a.a.ysis of Oil-Wa.er Flow with Dra. Reducing Polymers in Horizonta. Pipes

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Fluid Dyna.ics & Ma.eria.s Processing 2023年第10期19卷 2579-2595页

作者： a.er a.a.dulra.ma. Ba.ha. J.kadhim Za.na. Y.Shna.n Ha.sa. Sh.Ma.idi a.a.er a.a.wa.ti Fa.ooq a.-Sheikh a.na. a.a.dulRa.a. Moha.med Shorba. Ma.in J.Shibeeb Chemica. Engineering Depa.tment University of TechnologyBaghdadIraq Depa.tment of Chemica. Engineering a.d Petroleum Industries Al-Mustaqbal University CollegeBabylonIraq Ea.t Ba.hda. Southern EBS PETROLEUM COMPa.Y BaghdadIraq

The well-known frictiona. effect rela.ed to liquid-liquid two-pha.eﬂow in pipelines ca. be reduced using dra.-reducing *** this study,such a. effect ha. been investiga.ed experimenta.ly using a.mixture of oil a.d ***,numerica. simula.ions ha.e been ca.ried out using the COMSOL simula.ion *** mea.surements were ta.en in a.horizonta. pipe with the length a.d dia.eter equa. to 3 a.d 0.125 m,***,Polyethylene oxide with 150 ppm wa. exploited to reduce the dra. effect while considering different wa.er-to-oil fra.tions(0.3,0.4,0.5,a.d 0.7)a.d a.consta.t tota.ﬂow velocity of 2.3 m/*** ma.e evident by the results,a.signiﬁca.t reduction ca. be obta.ned in terms of pressure drop,which becomes even more signiﬁca.t a. the wa.er to oil fra.tion is *** ma.imum a.hieved dra. reduction is 70%with a.wa.er fra.tion of *** results a.so show tha. the a.dition of polymer a.ditives ca. a.so ha.e a. impa.t on theﬂow ***-pa.ison of experimenta. a.d numerica.ly determined pressure drop indica.es tha. the error is sma.ler tha. 7%.

关键词： Two-pha.e flow dra. reduction polymer COMSOL

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a.isymmetric smooth conta.t for a. ela.tic isotropic infinite hollow cylinder compressed by a. outer rigid ring with circula. profile

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a.ta.Mecha.ica.Sinica 2006年第1期22卷 46-53页

作者： a. a.ci a. Bulu a. Ya.ici Mecha.ica. Engineering Depa.tmentSelguk UniversityKonya 42075Turkey

a.conta.t problem for a. infinitely long hollow cylinder is considered. The cylinder is compressed by a. outer rigid ring with a.circula. profile. The ma.eria. of the cylinder is linea.ly ela.tic a.d isotropic. The extent of the conta.t region a.d the pressure distribution a.e sought. Governing equa.ions of the ela.ticity theory for the a.isymmetric problem in cylindrica. coordina.es a.e solved by Fourier tra.sforms a.d genera. expressions for the displa.ements a.e obta.ned. Using the bounda.y conditions, the formula.ion is reduced to a.singula. integra. equa.ion. This equa.ion is solved by using the Ga.ssia. qua.ra.ure. Then the pressure distribution on the conta.t region is determined. Numerica. results for the conta.t pressure a.d the dista.ce cha.a.terizing the conta.t a.ea.a.e given in gra.hica. form.

关键词： Ela.tosta.ic conta.t Thick-wa.led cylinder Singula. integra. equa.ion Rigid indenter

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Experimenta. investiga.ion of therma. performa.ce cha.a.teristics of sintered copper wicked a.d grooved hea. pipes:a.compa.a.ive study

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Journa. of Centra. South University 2021年第11期28卷 3507-3520页

作者： Sa.f Ulla. KHa.ID Ha.iz Muha.ma. a.I Muha.ma. a.i Na.IR Riffa. a.im Pa.Ha.Za.a. Sa.D L.Sya. SUNDa. a.med kadhim HUSSEIN Mecha.ica. Engineering Depa.tment University of Engineering and TechnologyTaxila 47050Pakistan Mecha.ica. Engineering Depa.tment King Fahd University of Petroleum&Minerals(KFUPM)Dhahran 31261Saudi Arabia Interdisciplina.y Resea.ch Center for Renewa.le Energy a.d Power Systems(IRC-REPS) King Fahd University of Petroleum and MineralsDhahran 31261Saudi Arabia Susta.na.le a.d Renewa.le Energy Engineering Depa.tment College of EngineeringUniversity of SharjahSharjah 27272United Arab Emirates Centre for Mecha.ica. Technology a.d a.toma.ion(TEMa.Ua. Department of Mechanical EngineeringUniversity of AveiroAveiro 3810-131Portugal Mecha.ica. Engineering Depa.tment College of EngineeringUniversity of BabylonBabylon CityHillaIraq

Hea. pipes a.e most frequently used for therma. ma.a.ement *** of right type of hea. pipe for a.specific scena.io is utmost necessa.y for best *** purpose of this resea.ch is compa.ison of therma. performa.ce cha.a.teristics of sintered copper wicked a.d grooved hea. pipes,which a.e mostly used types of hea. *** wa.er filled hea. pipes were tested through experimenta.ion in gra.ity a.sisted *** outcomes ha.e been compiled in terms of ca.illa.y pressure,opera.ing tempera.ure,therma. resista.ce a.d hea. tra.sfer *** pressure is high in sintered hea. pipes compa.ed to grooved hea. pipes irrespective of groove *** hea. pipes ha.e lower opera.ing tempera.ure compa.ed to sintered hea. pipes a. the sa.e hea. *** 8 W,compa.ed to sintered hea. pipes,grooved hea. pipes ha.e 8.24% lower condenser surfa.e tempera.ure,4.41% lower eva.ora.or surfa.e tempera.ure a.d 7.79% lower sa.ura.ion *** resista.ce of sintered hea. pipe is much lower tha. grooved hea. *** ma.imum rela.ive difference of 63.8% wa. observed a. 8 *** tra.sfer coefficient of sintered hea. pipe wa. observed double compa.ed to grooved hea. pipe a. 8 W hea. *** resista.ce a.d hence hea. tra.sfer coefficient of sintered hea. pipe cha.ge a.most in a.linea. ma.ner with respect to hea. loa. but unexpectedly turning point is observed in therma. resista.ce a.d hea. tra.sfer coefficient of grooved hea. *** hea. pipes a.ta.n equilibrium much ea.lier compa.ed to sintered *** hea. loa.s from 4 to 20 W ca.ses va.ia.ion in equilibrium esta.lishment time from 7 to 4 min for grooved a.d from 10 to 7 min for sintered hea. pipes.

关键词： hea. pipe therma. resista.ce hea. tra.sfer coefficient therma. performa.ce ca.illa.y pressure

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a.Comprehensive Review of the Inﬂuence of Hea. Excha.ge Tubes on Hydrodyna.ic,Hea.,a.d Ma.s Tra.sfer in Bubble a.d Slurry Bubble

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Fluid Dyna.ics & Ma.eria.s Processing 2023年第10期19卷 2613-2637页

作者： Da.ia.S.Ma.ki Ha.a. Sh.Ma.di a.er a.a.dulra.ma. a.ba. J.Sulta. Za.ra. W.Ha.a. La.th S.Sa.ri Ba.ha. J.kadhim Mutha.na.Ha.-Da.ha. Depa.tment of Chemica. Engineering University of Technology-IraqBaghdadIraq Depa.tment of Chemica. Engineering a.d Petroleum Industries Al-Mustaqbal University CollegeBabylon51001Iraq Depa.tment of Chemica. a.d Biochemica. Engineering Missouri University of Science and TechnologyRollaMOUSA

Bubble a.d slurry bubble column rea.tors(BCRs/SBCRs)a.e used for va.ious chemica.,biochemica.,a.d petro-chemica. *** ha.e severa. opera.iona. a.d ma.ntena.ce a.va.ta.es,including excellent hea. a.d ma.s tra.sfer ra.es,simplicity,a.d low opera.ing a.d ma.ntena.ce ***,a.ca.a.yst is present in a.dition to biochemica. processes where microorga.isms a.e used to produce industria.ly va.ua.le *** most a.plica.ions involve complica.ed ga.-liquid,ga.-liquid-solid,a.d exothermic processes,the BCR/SBCR must be equipped with hea.-excha.ging tubes to dissipa.e hea. a.d control the rea.tor’s overa.l *** this review,pa.t a.d very recent experimenta. a.d numerica. investiga.ions on such systems a.e critica.ly ***,ga.s to beﬁlled a.d critica. a.pects still requiring investiga.ion a.e identiﬁed.

关键词： Fischer-tropsch synthesis bubble/slurry bubble column rea.tors hea. excha.ging tubes hydrodyna.ic hea. tra.sfer ma.s tra.sfer

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非角膜地形图引导PRK联合角膜胶原交联术治疗圆锥角膜（英文）

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国际眼科杂志 2019年第3期19卷 358-362页

作者： Suza. a.a.a.Ra.ta. Seif a.sha.a.ti Kha.il M a.-Sa.em Ma.ir kadhim Muta.ha. 巴格达大学 Al kindy医学院伊拉克158001 a.qa.isiya.大学医学院伊拉克258001 Muta.大学医学院眼科约旦alkarak361710

目的:评估非角膜地形图引导圆锥角膜患者行光折变角膜切除术(PRK)和角膜胶原交联术(CXL)的视力、屈光度和临床疗效。方法:术后1mo, 3mo, 6mo a.d 12mo对34例患者未矫正视力(UDVa.和矫正距离视力(CDVa.,平、陡角膜测量读数以及并发症进... 详细信息

目的:评估非角膜地形图引导圆锥角膜患者行光折变角膜切除术(PRK)和角膜胶原交联术(CXL)的视力、屈光度和临床疗效。方法:术后1mo, 3mo, 6mo a.d 12mo对34例患者未矫正视力(UDVa.和矫正距离视力(CDVa.,平、陡角膜测量读数以及并发症进行评估。结果:共34例患者平均年龄为23.3±4.0岁。UDVa.CDVa.著提高,且术后1a.复平稳。通过超过1a.定期随访,T检验显示术前术后值有显著不同(Pa.CDVa.屈光状态。术后3mo达到稳定状态,与非角膜地形图引导PRK相比,地形图引导的唯一优势可能是通过Fourier术后分析,在某些患者中,球镜和柱镜轴位漂移。

关键词：圆锥角膜屈光手术屈光性角膜磨镶术角膜胶联疗法非角膜地形图引导屈光性角膜切除术近视散光

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Virtua. Experimenta. System to Qua.tita.ive Cha.a.teriza.ion of Corroded Sa.ples Using Monte Ca.lo Simula.ion

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Journa. of Physica. Science a.d a.plica.ion 2016年第1期6卷 182-193页

作者： a.i N. Moha.med a.a. B. kadhim Luma.Y. a.ba. Depa.tment of Physics College of Science University of Mustansiriyah Baghdad Iraq Depa.tment of a.tronomy College of Science University of Baghdad Baghdad Iraq

a.computer simula.ion progra. ba.ed on Monte Ca.lo method a.d photon ba.ksca.tering technique wa. designed a.d written to be a. virtua. experimenta. system, instea. of the rea. experimenta. system, concerning nondestructive testing of corroded ma.eria.s. The simula.ion ba.ed on this progra. wa. a.le to a.a.yze the energy distribution of photons tha. rea.h a.detector system a.ter suffering severa. successive Compton sca.tering events in a.ta.get. The informa.ion ha. been obta.ned by this technique is strongly rela.ed to the ma.eria. density, this a.lows cha.ges in the ma.eria. uniformity to be monitored. On these ba.es, the present computer simula.ion progra. is described to qua.tita.ively cha.a.terize the corrosion sta.us of steel sa.ples under insula.ion. The progra. is ca.ded out on FeO, Fe203, Fe304, Fe（OH）2 a.d F^C12. The results of this work were compa.ed with the theoretica. a.d experimenta. da.a. The compa.ison showed tha. a.e in good a.reement with the published da.a. Our simula.ion results a.e useful for tra.ning a.d development of huma. resources, sta.f a.d students, in the field of a.plica.ion of nuclea. techniques, pa.ticula.ly, in structura. industries a.d industry of petroleum a.d ga..

关键词： Corrosion NDT Compton sca.tering ga.ma.ba.ksca.tering Monte Ca.lo method.

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Mobile Communica.ion through 5G Technology (Cha.lenges a.d Requirements)

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Interna.iona. Journa. of Communica.ions, Network a.d System Sciences 2017年第5期10卷 202-207页

作者： Na.eer Hwa.di a.kha.a.li Ra.d a.dulja.ba. a.jizna.i Sa.a.Qa.im Ja.ba. Dheya. Ja.im kadhim Signa. School of Electronic Informa.ion a.d Communica.ion Engineering Huazhong University of Science and Technology Wuhan China Ministry of Communica.ion Iraqi Telecommunication and Post Company Baghdad Iraq Electrica. Engineering Depa.tment University of Baghdad Baghdad Iraq

Mobile communica.ion through 5G technology is the key objective of this work. Existing resea.ch works in mobile communica.ion through 5G technology in world submitted a.grea. necessa.y development towa.ds 5G technology in different work a.proa.hes including ha.dwa.e a.d softwa.e. 4G technology includes severa. sta.da.ds under a.common umbrella. simila. to previous genera.ions of communica.ion technologies. a.tua.ly 4G is good for now, however if look a. it in five or ten yea.s, 4G will obviously not be a.le to meet requirements for new a.plica.ions coming up in the next few yea.s. With 5G will increa.e the da.a.ra.e, reduce the end-to-end la.ency, a.d improve covera.e. These properties a.e pa.ticula.ly importa.t for ma.y a.plica.ions rela.ed to IoT a.d D2D, which they a.e recognized a. ones of the technology components of the evolving 5G a.chitecture. The ma.or contribution of this pa.er is the key provisions of mobile communica.ion through 5G (Fifth Genera.ion) technology of which is seen a. consumer oriented. In 5G technology a.d mobile consumer ha. given top priority over others. 5G technology is to ma.e use of mobile phones within very high ba.dwidth. The consumer never experienced the utmost va.ued technology a. *** 5G technologies comprise a.l types of sophistica.ed fea.ures which ma.e 5G technology most governing technology in the vicinity of future.

关键词： 5G Technology WLa. GSM LTE PLMN

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Rela.ionship between a.mospheric Dew Point a.d Sintera.ility of a.-Si Ba.ed a.loy

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Journa. of Ma.eria.s Science & Technology 2013年第1期29卷 70-76页

作者： a. Ma.onukul a. Sa.ee Na.iona. Meta. a.d Ma.eria.s Technology Center 114 Thailand Science ParkPaholyothin Rd. Ta.ST Tokyo Tech a.tomotive Engineering Progra. International College King Mongkut’s Institute of Technology LadkrabangChalongkrung Rd.

a.-Si ba.ed a.loys a.e interestingly used to produce a.tomotive components. Fa.rica.ion of such components by powder meta.lurgy （PM） ha. been developed continuously. During PM, severa. pa.a.eters a.fect the sintera.ility of the a.uminium powder, including a.mospheric dew point which is rega.ded a. one of the crucia. pa.a.eters. The objective of this work wa. to investiga.e the effect of the a.mospheric dew point on the sintera.ility of a.-14.9Si-2.4Cu-0.55Mg by studying the sintering cha.a.ters obta.ned under va.ious a.mospheric dew points. The a.uminium a.loy powder wa. pressed into tensile specimens a.d subsequently sintered in a.nitrogen a.mosphere a. 560 ℃ for 60 min with va.ied a.mospheric dew points. The results show tha. a. the dew point decrea.ed, the sintered properties were improved. The a.mospheric dew point of -38.4 ℃ is sufficient to obta.n good sintering cha.a.ters a.d it is a.hieva.le in a.commercia. furna.e.

关键词： a.uminium a.loys Sintering Mecha.ica. cha.a.terisa.ion a.mospheric dew point

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Effects of irregula.ity a.d initia. stresses on the dyna.ic response of viscoela.tic ha.f-spa.e due to a.moving loa.

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a.ta.Mecha.ica.Solida.Sinica 2017年第3期30卷 306-317页

作者： a.K. Singh a. Da. a. La.shma. a. Negi a. Cha.topa.hya. Depa.tment of a.plied Ma.hema.ics Indian Institute of Technology (Indian School of Mines) Dhanbad 826004 Jharkhand India

The present a.ticle dea.s with the stresses developed in a. initia.ly stressed irregula. viscoela.tic ha.f-spa.e clue to a.loa. moving with a.consta.t velocity a. a.rough free surfa.e. Expressions for norma. a.d shea. stresses a.e obta.ned in closed form. The substa.tia. effects of influence pa.a.eters, viz., depth （from the free surfa.e）, irregula.ity fa.tor, ma.imum depth of irregula.ity, viscoela.tic pa.a.eter, horizonta. a.d vertica. initia. stresses, a.d frictiona. coefficient, on norma. a.d shea. stresses a.e investiga.ed. Moreover, compa.a.ive study is ca.ried out for three different ca.es of irregula.ity, viz., recta.gula. irregula.ity, pa.a.olic irregula.iW a.d no irregula.ity, which is ma.ifested through gra.hs.

关键词： Viscoela.tic Irregula.ity Moving loa. Frictiona. coefficient Stresses

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