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Primary care physicians'knowledge,attitude and perception towards homosexuality in Singapore

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Global Health journal 2021年第4期5卷 209-214页

作者： derek Lim Seng Bin Ang Kandang Kerbau Women’s and Children’s Hospital 100 Bukit Timah Road Singapore

Aims:This study aim to gain insights into attitudes,acceptance and knowledge levels among family physicians toward homosexual people,which are important as they may affect care among this at-risk ***:An anonymized self-administered questionnaire in English was posted with the assistance of the College of Family Physicians Singapore in February 2015 to its 1529 members with self-addressed,pre-stamped envelopes for *** questionnaire included demographic questions such as age group,gender,religion,ethnicity,marital status and place of *** and scales that measured attitude,acceptance,knowledge and perception of colleagues who are homosexual were also included in the ***:451 responses(29.5%)were obtained,of which 441 were valid(28.84%).About 52.8%of participants were found to have negative,8.9%neutral and 38.3%positive attitudes toward ***(75.6%)were accepting of homosexuals,with 9.3%neutral and 15.1%not *** levels were poor,with a mean score of 6.9 out of a maximum of 13.A strong correlation was found between the attitudes towards lesbians and gay men(ATLG)and acceptance of homosexuals scales(r=0.69,Pjority of family physicians having negative attitudes towards homosexuality,most are able to accept *** better education in sexual orientation in the medical educational curriculum,the increase in knowledge will lead to better care for people with homosexuality.

关键词： Attitudes Acceptance Family physician Homosexuality Knowledge Stigma Sexual orientation Singapore

Error modeling, sensitivity analysis and assembly process of a class of 3-DOF parallel kinematic machines with parallelogram struts

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Science China(Technological Sciences) 2002年第5期45卷 467-476页

作者：黄田李亚唐国宝李思维赵兴玉 David.j.Whitehouse derek G.Chetewyn Xianping Liu School of Mechanical Engineering Tianjin University Tianjin 300072 China

This paper presents an error modeling methodology that enables the tolerance design, assembly and kinematic calibration of a class of 3-DOF parallel kinematic machines with parallelogram struts to be integrated into a unified framework. The error mapping function is formulated to identify the source errors affecting the uncompensable pose error. The sensitivity analysis in the sense of statistics is also carried out to investigate the influences of source errors on the pose accuracy. An assembly process that can effectively minimize the uncompensable pose error is proposed as one of the results of this investigation.

关键词： parallel kinematic machine, error modeling, sensitivity analysis, assembly process.

Effect of non-uniform swelling on coal multiphysics during gas injection: The triangle approach

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journal of Rock Mechanics and Geotechnical Engineering 2024年第4期16卷 1362-1372页

作者： Yifan Huang jishan Liu Yaoyao Zhao derek Elsworth Yee-Kwong Leong Department of Chemical Engineering School of EngineeringThe University of Western Australia35 Stirling HighwayWA 6009Australia State Key Laboratory of Coal Resources & Safe Mining China University of Mining& TechnologyBeijing100803China Department of Energy and Mineral Engineering G3 Centre and Energy InstituteThe Pennsylvania State UniversityUniversity ParkPA16802USA

In current dual porosity/permeability models,there exists a fundamental assumption that the adsorption-induced swelling is distributed uniformly within the representative elementary volume (REV),irrespective of its internal structures and transient ***,both internal structures and transient processes can lead to the non-uniform *** this study,we hypothesize that the non-uniform swelling is responsible for why coal permeability in experimental measurements is not only controlled by the effective stress but also is affected by the adsorption-induced *** propose a concept of the swelling triangle composed of swelling paths to characterize the evolution of the non-uniform swelling and serve as a core link in coupled multiphysics.A swelling path is determined by a dimensionless volumetric ratio and a dimensionless swelling *** swelling paths have the same start and end point,and each swelling path represents a unique swelling *** swelling path as the diagonal of the triangle represents the case of the uniform swelling while that as the two perpendicular boundaries represents the case of the localized *** paths of all intermediate cases populate inside the *** corresponding relations between the swelling path and the response of coal multiphysics are established by a non-uniform swelling *** define this method as the triangle approach and corresponding models as swelling path-based *** proposed concept and models are verified against a long-term experimental measurement of permeability and strains under constant effective *** results demonstrate that during gas injection,coal multiphysics responses have a close dependence on the swelling path,and that in both future experiments and field predictions,this dependence must be considered.

关键词： Transient process Heterogeneity Swelling triangle Swelling path Non-uniform swelling coefficient

Social media growth of orthopaedic surgery residency programs in response to the COVID-19 pandemic

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World journal of Orthopedics 2022年第8期13卷 693-702页

作者： joseph S Geller Dustin H Massel Michael G Rizzo Ean Schwartz jacob Eric milner Chester j Donnally III Department of Orthopaedic Surgery University of Miami Miller School of MedicineMiamiFL 33136United States Department of Orthopedics University of Miami Miller School of MedicineMiamiFL 33136United States University of Miami Leonard M.Miller School of Medicine University of Miami Miller School of MedicineMiamiFL 33136United States Miller School of Medicine University of MiamiMiamiFL 33136United States Texas Spine Consultants Texas Spine ConsultantsAddisonTX 75001United States

BACKGROUND In the Spring of 2020,residency programs across the country experienced rapid and drastic changes to their application process as a result of the coronavirus disease 2019(COVID-19)*** response,residency programs shifted to virtual events and began harnessing social media to communicate with *** To analyze the changes in social media usage by orthopaedic surgery programs in response to the COVID-19 *** Based on the 2019 residency and fellowship electronic database,accredited US orthopaedic surgery programs were reviewed for social media presence on Instagram and *** 47000 tweets from 2011-2021 were extracted through the Twitter application programming *** extracted:Total number of followers,accounts following,tweets,likes,date of account creation,hashtags,and *** language processing was utilized for tweet sentiment analysis and classified as positive,neutral,or *** data was collected and deemed current as of August 11,*** account foundation date analysis was based on the date recognized as the start of the COVID-19 outbreak in the United States,before or after March 1,*** A total of 85(42.3%)orthopaedic surgery residency program Twitter handles were ***-five(41.2%)programs joined Twitter in the nine months after the 2020 covid *** 2020,there was a 126.6%increase in volume of tweets by orthopaedic surgery residency accounts as compared to *** median number of followers was 474.5(interquartile range 205.0-796.5).The account with the highest number of tweets was Hospital for Special Surgery(@HSpecialSurgery)with 13776 tweets followed by University of Virginia(@UVA_Ortho)with 5063 and Yale(@OrthoAtYale)with *** analysis before 2020 revealed 30.4%positive,60.8%neutral,and 8.8%negative sentiments across ***,the positive sentiment percentage increased in 2020 from 30.4%to 34.5%.Of the 201 ACGME-accredited ortho

关键词： Social media COVID-19 Orthopaedic surgery Residency

Gouge stability controlled by temperature elevation and obsidian addition in basaltic faults and implications for moonquakes

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International journal of Mining Science and Technology 2024年第9期34卷 1273-1282页

作者： Shutian Cao Fengshou Zhang Mengke An derek Elsworth Manchao He Hai Liu Luanxiao Zhao Department of Geotechnical Engineering College of Civil EngineeringTongji UniversityShanghai 200092China Key Laboratory of Geotechnical&Underground Engineering of Ministry of Education Tongji UniversityShanghai 200092China Department of Energy and Mineral Engineering EMS Energy Institute and G3 CenterThe Pennsylvania State UniversityUniversity ParkPA 16802USA Department of Geosciences The Pennsylvania State UniversityUniversity ParkPA 16802USA State Key Laboratory for Geomechanics and Deep Underground Engineering China University of Mining and Technology-BeijingBeijing 100083China School of Civil Engineering Guangzhou UniversityGuangzhou 510006China School of Ocean and Earth Sciences Tongji UniversityShanghai 200092China

Basalt is a major component of the earth and moon *** composition and temperature influence frictional instability and thus the potential for seismicity on basaltic *** performed velocitystepping shear experiments on basalt gouges at a confining pressure of 100 MPa,temperatures in the range of 100-400℃ and with varied obsidian mass fractions of 0-100%under wet/dry conditions to investigate the frictional strength and stability of basaltic *** observe a transition from velocity-neutral to velocity-weakening behaviors with increasing obsidian *** frictional stability response of the mixed obsidian/basalt gouges is characterized by a transition from velocitystrengthening to velocity-weakening at 200℃ and another transition to velocity-strengthening at temperatures>300℃.Conversely,frictional strengths of the obsidian-bearing gouges are insensitive to temperature and wet/dry *** results suggest that obsidian content dominates the potential seismic response of basaltic faults with the effect of temperature controlling the range of seismogenic ***,shallow moonquakes tend to occur in the lower lunar crust due to the corresponding anticipated higher glass content and a projected temperature range conducive to velocity-weakening *** observations contribute to a better understanding of the nucleation mechanism of shallow seismicity in basaltic faults.

关键词： Fault stability Basaltic fault Temperature elevation Obsidian content Shallow moonquakes

Measuring powder flowability with a modified Warren Spring cohesion tester

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Particuology 2011年第2期9卷 148-154页

作者： Salam A.Mohammed Ezzat C.Abdullah derek Geldart Abdul Aziz A.Raman Department of Chemical Engineering Faculty of EngineeringUniversity of Malaya Powder Research Ltd. Harrogate& University of Leeds

The measurement of powder flowability is a major concern for most industrial processes that deal with the handling of bulk solids as raw materials, intermediates, or products. The development of devices that measure the flowability of non-aerated powders has not progressed as rapidly as might have been hoped since most research activities have been based on various types of shear testers intended to aid the design of hoppers. A new flowability indicator named as weighted cohesion （WS） is established using newly improved version of direct cohesion texture. A cornerstone of the proposed technique is that the procedure is automated, using a digital Warren Spring tester called Warren Spring-University of Malaya cohesion tester （WSUMCT）, thus making results operator-insensitive. Besides being a practical tool to diagnose the cohesion of experimental powders, the ratio between measured cohesion （using WSUMCT） and aerated density （using Hosokawa PT-S） provides us with a powerful technique to research fundamental particle internal cohesion forces directly and use these data to indicate the flowability. In this work, a series of fine （9.4μm） and coarse （60 μm） porous silica gel particle mixtures, and mixtures of fine （28μm） and coarse （72 μm） glass ballotini as well, were used as test powders. The results from these tests agree well with relative flowability determined on our newly driven indicator using WSUMCT. The validation of aerated weighted cohesion （WSA） as a flowability indicator was authenticated by comparing the conducted parameter with established measured Hausner ratio （HR） and angle of repose （AoR）.

关键词： Flowability Cohesion strength Hausner ratio Particle sizeAngle of reposeCohesive powder

Physical investigation on the behaviours of voussoir beams

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journal of Rock Mechanics and Geotechnical Engineering 2020年第3期12卷 516-527页

作者： Chaoshi Hu derek Apel Les jozef Sudak Wei Victor Liu Zhaoyuan Chu School of Mining and Petroleum Engineering Department of Civil and Environmental EngineeringUniversity of AlbertaEdmontonT6G 1H9Canada Department of Mechanical and Manufacturing Engineering University of CalgaryCalgaryT2N 1N4Canada Anhui Yitong Construction Consulting and Management Ltd.YuexiAnqing246000China

It is important to understand the behaviour of voussoir beams in the design of underground *** are a large number of discrepancies between the re sults obtained by differe nt researchers so *** resolve these discrepancies,physically testing the stress distribution at the mid span and abutment of voussoir beam is the *** this paper,a simple two-block voussoir beam was built with loading *** displacement and strain of the voussoir beam were measured by a digital image correlation *** strain distribution along the joints of voussoir beams was firstly ***,the relationship between transverse load and midspan displacement of voussoir beam was *** is found that the stress distributions at the midspan and abutment are different both in shape and *** stress distribution is changing as the loading changes as well.

关键词： Voussoir beam Stress distribution Image correlation

Perforation optimization of layer-penetration fracturing for commingling gas production in coal measure strata

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Petroleum Science 2022年第4期19卷 1718-1734页

作者： Bing Hou Zhuang Cui ji-Hui Ding Feng-Shou Zhang Li Zhuang derek Elsworth State Key Laboratory of Petroleum Resources and Prospecting China University of Petroleum-BejingBejing102249China MOE Key Laboratory of Petroleum Engineering in China University of Petroleum Beijing 102249China Department of Geophysics Stanford University397 Panama MallStanfordCA94305USA Department of Geotechnical Engineering Tongji UniversityShanghai200092China Korea Institute of Civil Engineering and Building Technology Goyang10223South Korea The Pennsylvania State University University ParkPA16802USA

Optimization of fracturing perforation is of great importance to the commingling gas production in coal measure *** this paper,a 3 D lattice algorithm hydraulic fracturing simulator was employed to study the effects of perforation position and length on hydraulic fracture propagation in coal measures of the Lin-Xing block,*** on field data,three lithologic combinations are simulated:1)a thick section of coal seam sandwiched by sandstones;2)a thin coal seam layer overlay by gas-bearing tight sandstone;3)two coal seams separated by a thin layer of *** simulation shows that perforation position and length in multi-layer reservoirs play a major role in hydraulic fracture *** maximum stimulated volume requires consideration of lithologic sequence,coal seam thickness,stress states,and rock *** improve the combined gas production in coal measure strata,it is possible to simultaneously stimulate multiple coal seams or adjacent gas-bearing *** these cases,perforation location and length also significantly impact fracture propagation,and therefore should be carefully *** simulation results using 3 D lattice algorithm are qualitatively consistent with laboratory physical simulation.3 D lattice models can be used to effectively simulate the fracture propagation through layers in coal measure *** numerical results provide guidance for perforation optimization in the hydraulic fracturing of coal measure strata.

关键词： Coal measure strata Combined production 3D lattice algorithm Perforation scheme optimization Fracture propagation

Emerging alternative for artificial ammonia synthesis through catalytic nitrate reduction

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journal of Materials Science & Technology 2021年第18期77卷 163-168页

作者： derek Hao Zhi-gang Chen Monika Figiela Izabela Stepniak Wei Wei Bing-jie Ni Centre for Technology in Water and Wastewater(CTWW) School of Civil and Environmental EngineeringUniversity of Technology Sydney(UTS)UltimoNSW2007Australia Centre for Future Materials University of Southern QueenslandSpringfield CentralQueensland4300Australia School of Mechanical and Mining Engineering The University of QueenslandBrisbaneQueensland4072Australia Institute of Chemistry and Applied Electrochemistry Faculty of Chemical TechnologyPoznan University of TechnologyBerdychowo 4PL-60965PoznanPoland

Artificial catalytic synthesis of ammonia has become a hot research frontier in recent *** is regarded as a promising approach that may replace the Haber-Bosch process and reduce global carbon dioxide ***,it is extremely difficult for the cleavage of nitrogen molecules under ambient *** the ammonia yield rate is still low and the study is still limited in lab *** nitrites or nitrates are used as nitrogen sources,rather than nitrogen gas,the catalytic efficiency can be significantly improved,and the residual nitrate and nitrite contaminations in water systems can be efficiently eliminated and converted to energy sources at the same *** is an emerging alternative for artificial ammonia synthesis,while there is not enough focus on the reduction of nitrate and ***,we systematically compared the differences between the reduction of nitrogen and nitrates,as well as listed the challenges in this *** total conversion rate and energy efficiency of catalytic nitrate reduction are much higher than nitrogen gas reduction due to the much higher solubility and better converting pathway,which might be further enhanced by employing catalysts improvement ***,we also proposed suitable materials as well as a few future researches needs that may help boost the development of artificial ammonia synthesis using nitrate.

关键词： Nitrogen fixation Nitrate reduction Ammonia synthesis Electrocatalysis Photocatalysis