您现在的位置: 首页> 研究主题> displacement

displacement

displacement的相关文献在1989年到2022年内共计122篇,主要集中在肿瘤学、数学、金属学与金属工艺 等领域,其中期刊论文122篇、相关期刊69种,包括中国科学、中国科学院近代物理研究所和兰州重离子研究装置年报:英文版、中国有色金属学会会刊:英文版等; displacement的相关文献由325位作者贡献,包括Alireza Boorboor、Derek T. Rensing、Eiji Tomita等。

displacement—发文量

期刊论文>

论文:122 占比:100.00%

总计:122篇

displacement—发文趋势图

displacement

-研究学者

  • Alireza Boorboor
  • Derek T. Rensing
  • Eiji Tomita
  • Jianping Yuan
  • Kazuya Tsuboi
  • Longyan Wang
  • Mahmood Hosseini
  • Mohammad M. Tabanjeh
  • Nahid Shabestary
  • Peng Yu
  • 期刊论文

搜索

排序:

年份

期刊

关键词

    • Keqi YE; Yuelin ZHAO; Feng WU; Wanxie ZHONG
    • 摘要: The numerical oscillation problem is a difficulty for the simulation of rapidly varying shallow water surfaces which are often caused by the unsmooth uneven bottom,the moving wet-dry interface,and so on.In this paper,an adaptive artificial viscosity(AAV)is proposed and combined with the displacement shallow water wave equation(DSWWE)to establish an effective model which can accurately predict the evolution of multiple shocks effected by the uneven bottom and the wet-dry interface.The effectiveness of the proposed AAV is first illustrated by using the steady-state solution and the small perturbation analysis.Then,the action mechanism of the AAV on the shallow water waves with the uneven bottom is explained by using the Fourier theory.It is shown that the AVV can suppress the wave with the large wave number,and can also suppress the numerical oscillations for the rapidly varying bottom.Finally,four numerical examples are given,and the numerical results show that the DSWWE combined with the AAV can effectively simulate the shock waves,accurately capture the movements of wet-dry interfaces,and precisely preserve the mass.
    • Ugbe Maurice-Joel Ugbe; Ekpereonne Babatunde Esu; Joseph Ajah Efut; Marvin Muji Bisongedam; Theresa Mark Awa; Ofem Irom Ekpo
    • 摘要: Background Displaced persons in Nigeria experience various difficultiesat different stages of their displacement,including mental and physical proble ms.These experiences have been associated with different types of mental disorders.Aims This study sought to identify sociodem ographic correlates and other factors associated with depression and anxiety among internally displaced adults in Ogoja,Cross River State,Nigeria.Methods A cross-sectional study was conducted using non-probabilityand probability sampling techniques.Internally displaced adults(n=335)were identified in Ogoja locations with a high prevalence of internally displaced persons(IDPs).Their mental health symptoms were assessed using the Common Mental Disorder Questionnaire.and asemistructured questionnaire was employed to collect data on sociodemographic and displacement-related characteristics.Data were analysed using descriptive statistics.x^(2)analysis and multivariable logistic regression.Results The prevalence of subtypes was 66.0%for anxiety disorder and 73.4%for depression.Factors found to be significant in each bivariate x^(2)analysis were modelled for each outcome.The multivariate analysis revealed that prolonged displacement(adjusted odds ratio(AOR)=3.64;p=0.048),reduced family size(AOR=0.28;p<0.001)and fears of reprisal attacks(AOR=4.19;p=0.004)were significantly associated with anxiety disorder.Male gender(AOR=2.09;p=0.015).prolonged displacement(AOR=3.55;p-0.020).reducedfamily size(AOR=0.55;p=0.049),financial strain(AOR=5.43 p=0.023)and loss of loved ones(AOR=1.92;p=0.040)were significantly associated with depression.Conclusions The implications of the findings underline the complex aetiology of these two mental problems and the need to cater to the well-being of those at risk who have been exposed to trauma-related events.Accessible and affordable mental health services should be provided for these persons while also considering a social welfare scheme that covers their health expenses.Moreover socioeconomic conditions targeting IDPs in the Ogoja Government Area should be improved by conducting largescale mapping to identify this population.
    • S.M.Sivagami; A.Bovas Herbert Bejaxhin; R.Gayathri; T.Raja Vijay; K.Punitharani; P.Keerthi Vasan; M.Meignanamoorthy
    • 摘要: A foot bracket is a metal panel bracket used to mount and support the footrest in two-wheeler systems.It holds the footrest in place while rigidly supporting it.In working conditions,this element has often been observed to fail when specific load-fluctuation conditions are established at its rear end.Appropriate materials therefore need to be identified to overcome such a recurring failure.To address these issues,the present study has been implemented with the specific objective to determine the response of selected Al6061-T6 and Al7075-T6 Hybrid Metal Matrix Composites(HMMC).The results,obtained using the ANSYS Software,show that the selected composites can withstand 636,962 N/m^(2)of maximum stress and 8.88×10^(−6)m of minimum displacement.These results are also compared with relevant mathematical models and it is concluded that the identified material combination provides the required improvement of structural stability that can withstand the load fluctuation on the foot bracket.
    • Koji Watanabe; Daigo Yoshiga; Teppei Sago; Masafumi Oda; Izumi Yoshioka; Seiji Watanabe; Yasuhiro Morimoto
    • 摘要: Supernumerary tooth in the upper central incisor region is called mesiodens. Mesiodens causes serious complications such as displacement, retarded eruption, and rotation in the adjacent permanent incisors, inducing inhibition of oral development. This report was aimed to provide epidemiology of mesiodens in Japanese children. Using dental record, panoramic radiographs and images of cone-beam computed tomography in 128 non-syndromic child patients, patients’ age at their first visit, gender composition, shape of mesiodens, position of mesiodens, posture of mesiodens, and age distribution of the patients based on each complication were investigated. In addition to the survey, patient age was compared between the groups with and without each complication. Patients’ age ranged 3 - 10 years old. Male-to-female ratio was approximately 3:1. Conical shape (75%) and inverted position (49%) were the most frequent among the patients. Displacement was the commonest complication. Age comparison indicated that patients with displacement or retarded eruption consulted the dentist younger than those without the complications. The present study provided etiology of mesiodens in Japanese children that will contribute to daily clinical practice in the field of pediatric dentistry.
    • Shirley Thompson; Kaoru Suzuki
    • 摘要: Four participatory video research projects were undertaken over eight years with two Indigenous communities displaced by a flood. The films focus on how floodwaters were diverted away from non-Indigenous regions to Indigenous communities at Lake St. Martin by Canada’s colonial government. This displacement repeats the colonial pattern of forcibly relocating Indigenous people away from their land, resources, and good life. This participatory video research of flood stories underwent a content, process, and outcome analysis. The environmental, social, cultural, health and economic impacts are documented in the films, including poverty, environmental injustice, gang predation, separation of families, food insecurity, illness, culture loss, addictions, and racism. The films captured the lived experience of Elders, youth and, families during their eight years of displacement to temporary, unsuitable accommodations and upon relocation. In terms of process, community members engaged in filming, scriptwriting, and narrating to tell their stories. The process was transformative, decolonizing, and built community research capacity. The participatory video research was helpful for lawyers advocating for compensation. The popularity of the videos online exceeded that of academic papers and helped fuel a movement to wake people to the ongoing colonial injustices faced by Indigenous people across Canada. This paper not only analyzes the films but traces the roots of Indigenous displacement by man-made flooding to the Indian Act and colonization, calling for abolishing the Indian Act and decolonization.
    • Shengli ZHANG
    • 摘要: Dear editor,Quantum illumination [1] is a new quantum information technique for detecting quantum targets with low reflectivity via quantum entanglement and correlation measurements.Compared with its classical variant, quantum illumination offers a higher signal-to-noise ratio and lower energy consumption.
    • Guoxiao Yin; Qingsong He; Xiangman Zhou; Yuwei Wu; Hongkai Li; Min Yu
    • 摘要: In this work,we printed a Nafion precursor membrane by fused deposition modeling(FDM)rapid prototyping technology and further fabricated IPMCs by electroless plating.The ion-exchange capacity of the Nafion membrane was tested,and the morphology of IPMCs was observed.The electro-mechanical properties of IPMCs under AC voltage inputs were studied,and grasping experiments were performed.The results show that the Nafion membrane after hydrolysis has a good ion-exchange ability and water-holding capacity.SEM observed that the thickness of the IPMC’s electrode layer was about 400 nm,and the platinum layer was tightly combined with the substrate membrane.When using a square wave input of 3.5 V and 0.1 Hz,the maximum current of IPMCs reached 0.30 A,and the displacement and blocking force were 7.57 mm and 10.5 mN,respectively.The new fabrication process ensures the good driving performance of the printed IPMC.And two pieces of IPMCs can capture the irregular objects successfully,indicating the feasibility of printing IPMCs by FDM technology.This paper provides a new and simple method for the fabrication of three-dimensional IPMCs,which can be further applied in flexible grippers and soft robotics.
    • Xu Guolin; Zhang Lingxin; Bai Yashuang; Sun Hao
    • 摘要: Mode superposition is a widely used method for solving the dynamic equilibrium equation in structural dynamic analysis.However,the accuracy of this method may be reduced when the dynamic equilibrium equations are set up using displacement excitation.A new method for developing solutions for dynamic equilibrium equations based on displacement excitation is introduced.The dynamic equilibrium equation is decomposed into two parts,namely displacement excitation and velocity excitation,and precise integration and mode superposition methods are combined to solve the equation.Ritz vectors are then used to calculate the static response of the truncated modes of the structure,and a method for determining the number of participating modes is obtained.Using multi-degree-of-freedom systems as two computational examples,the differences in the structural responses obtained from the displacement excitation and acceleration excitation are compared and analyzed.It is shown that the new solution method generates consistent accuracy between the displacement excitation and acceleration excitation.
    • Junfu Zhu; Qian Yin; Hongwen Jing; Xinshuai Shi; Minliang Chen
    • 摘要: This study experimentally and numerically investigated the anchorage properties,bolt force evolution,deformation and stress fields of blocky rock mass with various dip angles of joint surfaces under an applied axial load.The results show that due to bolt reinforcement,the axial stress-strain curves of anchorage blocky rock mass show typical strain-hardening characteristics,and comparedwithmodels without anchorage,the peak strength and elastic modulus increase by 21.56%and 20.0%,respectively.With an increase in axial stress,the lateral strain continuously increases,and restriction effects of bolts reduce the overall deformation of model surfaces.The axial stressstrain curves of anchorage blocky rock mass in the simulations present a“double peak strength”phenomenon due to bolt reinforcement,and the peak strength,second peak strength,residual strength,surface displacement field,as well as the principal stress fields all depend on the dip angles of joint surfaces.As a result of the bolt reinforcement effects,cone-shaped compression zones are produced in the models,and compression zones of adjacent bolts superimpose with each other to form anchorage belts,improving the overall bearing capacity of anchorage models.Obvious stress concentration can be observed at both bolt end and anchorage section.Not only the role of bolt support transfers the blocky rock mass to be a three-dimensional stress state through compression effects,but also it improves both tensile strength and shear resistance of both joint surfaces and the overall blocky rock mass.
    • Quanyou LIU12; Dongya ZHU12; Qingqiang MENG12; Jiayi LIU12; Xiaoqi WU12; Bing ZHOU12; Qi FU3; Zhijun JIN12
    • 摘要: As a relatively stable craton block in the earth system, the petroliferous basin is influenced by the evolution of the earth system from the early development environment of source rocks, hydrocarbon formation, and reservoir dissolution to hydrocarbon accumulation or destruction. As a link between the internal and external factors of the basin, deep fluids run through the whole process of hydrocarbon formation and accumulation through organic-inorganic interaction. The nutrients carried by deep fluids promote the bloom of hydrocarbon-generating organisms and extra addition of carbon and hydrogen source, which are beneficial to the development of high-quality source rock and enhancement of the hydrocarbon generation potential. The energy carried by the deep fluid promotes the early maturation of the source rock and facilitates the hydrocarbon generation by activation and hydrogenation in high-mature hydrocarbon sources. The dissolution alteration of carbonate rocks and clastic reservoirs by CO2-rich deep fluids improves the deep reservoir space, thus extending the oil and gas reservoir space into greater depth. The extraction of deeply retained crude oil by deep supercritical CO2 and the displacement of CH4 in shale have both improved the hydrocarbon fluidity in deep and tight reservoirs. Simultaneously, the energy and material carried by deep fluids(C, H, and catalytic substances) not only induce inorganic CH4 formation by Fischer-Tropsch(F-T) synthesis and "hydrothermal petroleum" generation from organic matter by thermal activity but also cause the hydrothermal alteration of crude oil from organic sources. Therefore, from the perspective of the interaction of the earth’s sphere, deep fluids not only input a significant amount of exogenous C and H into sedimentary basins but also improve the reservoir space for oil and gas, as well as their enrichment and accumulation efficiencies.
  • 查看更多

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号