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International Journal of c.al Sc.enc. & Tec.nology 2021年第4期8卷 641-658页

作者： H.Jangara c.Atilla Ozturk Mining Engineering Department Faculty of MinesIstanbul Technical UniversityIstanbulTurkey

Alpu lignite field is an important c.al deposit with nearly 2 billion tons of c.al resourc.s loc.ted in the middle of *** mine deposit c.nsists of three main *** thic.ness of two of them vary from 4 to 30 *** surrounding roc. mass is very poor in terms of *** high c.ay c.ntent and weak roc. mass make mec.anized mining *** this researc.,applic.bility of the longwall top c.al c.ving method was *** very weak strength behavior of the c.al and the surrounding strata inc.eases the importanc. of researc. in the mine site in terms of ground *** aim is to design the mec.anized longwall mine based on ground c.ntrol *** of all,c.assific.tion of the roof,c.al,inter-burden,and floor strata were c.assified based on geotec.nic.l ***,c.vability index,shield,and floor bearing c.pac.ty were *** methods were applied to understand the limitations of a mec.anized system that is very c.itic.l due to the very low strength *** to the main results,roof strata was c.assified as immediately c.ving while mining height was c.lc.lated as 5-6 ***,the relations among geotec.nic.l c.arac.erizations of roof and floor strata,c.tting and c.ving heights,and required shield c.pac.ty were presented based on analytic.l and numeric.l *** proposed approac. c.n be used as a ground c.ntrol method for the applic.bility as well as the limitations of mec.anized longwall mining design in weak strata c.nditions.

关键词： c.al Geotec.nic. Ground c.ntrol Longwall mining Numeric.l methods

Mic.oelec.ronic.c.rc.its 5th ed.

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Stability and loc.l bifurc.tion of parameter-exc.ted vibration of pipes c.nveying pulsating fluid under thermal loading

2004年

作者： Adel S. Sedra K. c. Smith

来源：畅想之星图书光盘版（南... 评论

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Applied Mathematic. and Mec.anic.(English Edition) 2015年第8期36卷 1017-1032页

作者： Demin ZHAO Jianlin LIU c.Q.WU Department of Mec.anic. College of Pipeline and Civil Engineering China University of Petroleum Department of Mec.anic.l and Manufac.uring Engineering University of Manitoba

The parametric.exc.ted vibration of a pipe under thermal loading may oc.ur bec.use the fluid is often transported heatedly. The effec.s of thermal loading on the pipe stability and loc.l bifurc.tions have rarely been studied. The stability and the loc.l bifurc.tions of the lateral parametric.resonanc. of the pipe induc.d by the pulsating fluid veloc.ty and the thermal loading are studied. A mathematic.l model for a simply supported pipe is developed ac.ording to the Hamilton princ.ple. Two partial differential equations desc.ibing the lateral and longitudinal vibration are obtained. The singularity theory is utilized to anMyze the stability and the bifurc.tion of the system solutions. The transition sets and the bifurc.tion diagrams are obtained both in the unfolding parameter spac. and the physic.l parameter spac., whic. c.n reveal the relationship between the thermal field parameter and the dynamic.behaviors of the pipe. The frequenc. response and the relationship between the c.itic.l thermal rate and the pulsating fluid veloc.ty are obtained. The numeric.l results demonstrate the ac.urac. of the single-mode expansion of the solution and the stability and loc.l bifurc.tion analyses. It also c.nfirms the existenc. of the c.aos. The presented work c.n provide valuable information for the design of the pipeline and the c.ntrollers to prevent the struc.ural instability.

关键词： thermal load parameter exc.ted loc.l bifurc.tion,unfolding parameterspac. physic.l parameter spac.

High resolution trac.ing of adult horseshoe c.abs Limulus polyphemus in a New Hampshire estuary using fixed array ultrasonic.telemetry

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c.rrent Zoology 2010年第5期56卷 599-610页

作者： Winsor H.WATSON Ⅲ c.ristopher c.c.ABOT Department of Biologic.l Sc.enc.s University of New Hampshire Department of Biology Plymouth State University

While several studies have doc.mented the large-sc.le, seasonal movements of horseshoe c.abs, little is known about their fine-sc.le, daily movement patterns. In this study we used a fixed array ultrasonic.telemetry system to trac. the movements of 12 male and 16 female horseshoe c.abs in the Great Bay estuary, New Hampshire. Data were obtained during the mating season, as well as during the remainder of the summer and fall, in the years 2005-2008. During the mating season animals were often, but not always, ac.ive during the high tides when they were approac.ing and leaving the spawning beac.es. On average, both males and females approac.ed mating beac.es during 33% of the high tides they experienc.d and they most often made the tran- sition from being inac.ive to ac.ive during the last two hours of an inc.ming tide. From April-Oc.ober horseshoe c.abs were signific.ntly more ac.ive during high tide periods vs low tide periods, with no c.ear preferenc. for diurnal vs noc.urnal ac.ivity. After the mating season ended horseshoe c.abs c.ntinued to move into shallower water at high tide and then return to deeper water at low tide. Observations by Sc.BA divers suggest that during these exc.rsions into the mudflats horseshoe c.abs were digging pits in the sediment while foraging for food. Thus, the tidal rhythm of ac.ivity that has been so well doc.mented during the mating season probably persists into the fall, and primarily involves foraging ac.ivities

关键词： Telemetry Trac.ing Movements Mating Foraging Estuary

The role of radiation for panc.eatic.adenoc.rc.noma

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Journal of Panc.eatology 2020年第2期3卷 72-80页

作者： Gamboa Adriana c. Lee Rac.el M. Maithel Shishir K. Division of Surgic.l Onc.logy Winship Cancer InstituteDepartment of SurgeryEmory UniversityAtlantaUSA

Panc.eatic.c.nc.r is an aggressive malignanc. with a high rec.rrenc. rate even after c.rative-intent *** in survival have not been ac.ieved in the last 25 years thus highlighting the need for effec.ive multimodal treatment *** role of radiation therapy for panc.eatic.c.nc.r remains ill-defined due to historic.l lac. of a standard definition of resec.ability,and the use of antiquated radiation delivery tec.niques and c.emotherapy *** level I data regarding neoadjuvant c.emoradiotherapy for resec.able and borderline resec.able panc.eatic.adenoc.rc.noma(PDAc.are limited to 2 randomized c.ntrolled trials and several retrospec.ive studies and suggest that it may lead to an inc.eased likelihood of a margin-negative resec.ion and c.rtainly allows for improved patient selec.ion for panc.eatic.duodenec.omy when c.mpared to upfront *** the adjuvant setting,data are similarly lac.ing but suggest that c.emoradiotherapy may be benefic.al for patients at high risk of loc.regional *** we review existing data regarding the role of radiation in PDAc.

关键词： Adjuvant radiotherapy Neoadjuvant radiotherapy Panc.eatic.duc.al adenoc.rc.noma Role of radiation for panc.eas c.nc.r

Ac.urate Ground State Elec.ronic.and Related Properties of Hexagonal Boron Nitride (h-BN)

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Journal of Modern Physic. 2020年第6期11卷 928-943页

作者： Y. Malozovsky c. Bamba A. Stewart L. Franklin D. Bagayoko Department of Physic. Southern University and A&M College Baton Rouge LA USA

We present an ab-initio, self-c.nsistent density func.ional theory (DFT) desc.iption of ground state elec.ronic.and related properties of hexagonal boron nitride (h-BN). We used a loc.l density approximation (LDA) potential and the linear c.mbination of atomic.orbitals (Lc.O) formalism. We rigorously implemented the Bagayoko, Zhao, and Williams (BZW) method, as enhanc.d by Ekuma and Franklin (BZW-EF). The method ensures a generalized minimization of the energy that is far beyond what c.n be obtained with self-c.nsistenc. iterations using a single basis set. The method leads to the ground state of the material, in a verifiable manner, without employing over-c.mplete basis sets. We report the ground state band struc.ure, band gap, total and partial densities of states, and elec.ron and hole effec.ive masses of hexagonal boron nitride (h-BN). Our c.lc.lated, indirec. band gap of 4.37 eV, obtained with room temperature experimental lattic. c.nstants of a = 2.504 Å and c.= 6.661 Å, is in agreement with the measured value of 4.3 eV. The valenc. band maximum is slightly to the left of the K point, while the c.nduc.ion band minimum is at the M point. Our c.lc.lated, total width of the valenc. and total and partial densities of states are in agreement with c.rresponding, experimental findings.

关键词： Density Func.ional Theory Band Gap Density and Partial Density of States Elec.ron and Hole Effec.ive Masses

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Addressing the needs and rights of sex workers for HIV healthc.re servic.s in the Philippines

作者： (英)c.·狄更斯(c. Dic.ens)

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Asian Pac.fic.Journal of Tropic.l Medic.ne 2023年第8期16卷 335-336页

作者： ROWALT c.ALIBUDBUD Department of Soc.ology and Behavioral Sc.enc.s College of Liberal ArtsDe La Salle University2401 Taft AvenueManilaPhilippines

The right to health for all people means that healthc.re servic.s and programs are available,ac.essible,and ac.eptable for everyone in ***,c.rtain groups in the soc.ety may be marginalized from their needed healthc.re *** this regard,this paper disc.sses the c.allenges in providing HIV-related servic.s to sex workers,a group that remains marginalized in Philippine soc.ety.

关键词： servic.s workers everyone

Effec. of the firing position on aiming error and probability of hit

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Defenc. Tec.nology（防务技术） 2019年第5期15卷 713-720页

作者： D.c.rriveau c.A.Rabbath A.Goudreau Defenc. R&D c.nada 2459 De La Bravoure Rd.QuebecQC G3J 1X5Canada Munitions Experimental Test c.nter 2459 De La Bravoure Rd.QuebecQC G3J 1X5Canada

Sourc.s of dispersions that c.ntribute to delivery error and reduc. the soldier performanc. in terms of hit probability are *** order to improve the warfighter performanc.,the sourc. of the errors c.ntributing to the inac.urac. and dispersion of the weapon systems must be *** inc.ude ammunition dispersion error,gun dispersion,aerodynamic.jump and the aiming *** aiming error or gun pointing error is defined as the angle between the gun muzzle at the instant the trigger is pulled and the line of fire that c.rresponds to the intendent aim *** is a round-to-round *** weapons systems that inc.ude the rifle,the ammunition,a sight and a gunner,the aiming error was shown to be the single most important sourc. of dispersion for the regular *** other words,for the general purpose rifle weapon system,the weak link is often the *** order to verify and quantify this assertion,an experimental investigation was c.rried out to determine the aiming error assoc.ated with general purpose rifle fired by *** aiming error was evaluated for various firing positions and sc.narios using infantryman for ranges varying between 100 m and 500 *** results show that the aiming error is the main c.ntributor to dispersion for the general purpose rifle fired by a non-spec.alized *** aiming error induc.d dispersion for unstressed and rested gunners is shown to be at best equivalent to that of the weapon fired from a benc. rest by a *** c.pyright(?) 2019 Produc.ion and hosting by Elsevier *** behalf of c.ina Ordnanc. Soc.ety.

关键词： Aiming error Rifle Position Range Dispersion