检索结果-南通市图书馆

Numerical analysis and geophysical monitoring for stability assessment of the Northwest tailings dam at Westwood Mine

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Mining Science and Technology 2017年第4期27卷 701-710页

作者： Coulibaly yaya Belem Tikou Cheng liZhen Research Institute on Mines and Environment (RIME) Universite du Quebec en Abitibi-Temiscamingue Rouyn-Noranda J9X 5E4 Canada

The Westwood Mine aims to reuse the tailings storage facility #1(TSF #1) for solid waste storage, but,downstream of the Northwest dike is considered critical in terms of stability. This paper uses numerical modeling along with geophysical monitoring for assessing the Northwest dike stability during the restoration phase. The impact of waste rock deposition in the upstream TSF #1 is considered. The geophysical monitoring is based on electrical resistivity methods and was used to investigate the internal structure of the dike embankment in different deposition stages. The numerical simulations were performed with SlOPE/W code. The results show a factor of safety well above the minimum recommended value of 1.5. Geophysical monitoring revealed a vertical variation in the electrical resistivity across the dike, which indicates a multilayer structure of the embankment. Without any current in situ data, the geophysical monitoring helped estimating the nature of the materials used and the internal structure of the embankment. These interpretations were validated by geological observation of geotechnical log of the embankment. Based on this study, it is recommended that the water polishing pond be partly filled before waste rock is deposited in TSF #1. In addition, to ensure the stability of the dike, the piezometric head monitoring prior to and during waste rock deposition is recommended.

关键词： Mine tailings impoundment Dike Embankment Numerical analysis Factor of safety Geophysical monitoring

CFD-Based Numerical Analysis of the Thermal Characteristics of an Electric Vehicle Power Battery

在线全文

学校读者我要写书评

暂无评论

Fluid Dynamics & Materials Processing 2022年第1期18卷 159-171页

作者： yaya Wang Chao Ma Xi’an Traffic Enginering Institute Xi’an710000China Xi’an Technological University Xi’an710000China

Towards the end to solve the problem of temperature rise in the power battery of electric vehicles,a method based on the coupling of electrochemical,thermal and hydrodynamic aspects is *** method relies on the COMSOl Multiphysics software,which is used here to simulate the thermal behaviour,the related fluid-dynamics and the life attenuation of the power battery.A 3D battery model is built assuming a cylindrical *** diameter of the battery is 18 mm,and its length is 65 *** battery charges and discharges at 3C,and the initial temperature is 25°*** flow is set to 0.5 m/s after the air of the battery is *** results show that:(1)The highest temperature of the battery unit increases significantly from 1.14°C of the original nylon heat pipe to 0.17°C of the hot pipe core shaft;(2)When the short circuit of the battery is simulated,the temperature rise of the single battery is close to 20°C,the minimum rise is about 12°C,and their difference reaches 8°C.

关键词： Fluid mechanics power batteries thermal characteristics electrochemical coupling thermal control

Synthesis of Cu^Ⅱ/ZIF-8 Metal-organic Framework Catalyst and Its Application in the Aerobic Oxidation of Alcohols

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2019年第5期35卷 860-865页

作者： HOU Junying HAO Jianjun WANG yaya lIU Jingchun College of Mechanical and Electrical Engineering Agricultural University of Hebei ProvinceBaoding 071001P.R.China

The tliree-dimensional copper-doped zeolitic imidazolate framework ZIF-8(Cu^Ⅱ/ZIF-8) was prepared by a metal ion exchange process, using reaction of three different copper salts, zinc nitrate hexahydrate[Zn(NO)3·6H2O] and 2?methylimidazole(2-MelM) under nitrogen atmosphere at the room temperature. The TEM and PXRD results indicated that the morphology of Cu^Ⅱ/ZIF-8 was rhombic dodecahedron and the structure was intact after copper was doped into the porous ZIF-8. The synthesized Cu(NO3)2/ZIF-8 heterogeneous catalyst showed an excellent activity for tlie aerobic oxidation of primary alcohols employing molecular oxygen as oxidant. Moreover, tlie Cu(NO3)2/ZIF-8 heterogeneous catalyst can cycled 15 times without leaching of copper.

关键词： Metal organic framework Heterogeneous catalyst Molecular oxygen

Self-Dual Hadamard Bent Sequences

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Systems Science & Complexity 2023年第2期36卷 894-908页

作者： SHI Minjia lI yaya CHENG Wei CRNKOVIC Dean KROTOV Denis SOléPatrick Key laboratory of Intelligent Computing Signal Processing Ministry of EducationSchool of Mathematical SciencesAnhui UniversityHefei 230601China State Key laboratory of Information Security(Institute of Information Engineering) Chinese Academy of SciencesBeijing 100093China. lTCI Télécom ParisParis91120 PalaiseauFrance Secure-IC S.A.S. 104 Bd du Montparnasse75014 Paris Faculty of Mathematics University of RijekaNovosibirsk 630090Russia Sobolev Institute of Mathematics Novosibirsk 630090Russia Aix Marseille Univ CNRSCentrale MarseilleI2MMarseilleFrance

A new notion of bent sequence related to Hadamard matrices was introduced recently,motivated by a security application(Solé,et al.,2021).The authors study the self-dual class in length at most *** authors use three competing methods of generation:Exhaustion,linear Algebra and Gr?bner *** Hadamard matrices and Bush-type Hadamard matrices provide many *** authors conjecture that if v is an even perfect square,a self-dual bent sequence of length v always *** authors introduce the strong automorphism group of Hadamard matrices,which acts on their associated self-dual bent *** authors give an efficient algorithm to compute that group.

关键词： Bent sequences bush-type Hadamard matrices Hadanard matrices PUF functions regular Hadamard matrices

Blood pressure-controlling behavior in relation to educational level and economic status among hypertensive women in Ghana

在线全文

学校读者我要写书评

暂无评论

Family Medicine and Community Health 2018年第3期6卷 115-123页

作者： Bishwajit Ghose Sanni yaya Faculty of Social Sciences School of International Development and Global StudiesUniversity of OttawaOttawaONCanada

Objective:To explore the association between economic status and educational level with self-management behavior(medication adherence,controlling body weight,reducing salt intake,performing physical exercise,reducing alcohol consumption,abstaining from smoking,increasing fruit and vegetable consumption)among hypertensive women in ***:Cross-sectional data on 598 women were collected from the Ghana Demographic and Health Survey of *** association between economic status and educational level with self-management behavior was measured by logistic regression ***:Mean systolic blood pressure and diastolic blood pressure were 131.4 and 86.58 mm Hg,*** regard to self-management behavior,81.8%of women reported taking medication to control high blood pressure,44.4%reported controlling body weight,22.5%reported reducing salt intake,48.3%reported performing physical exercise,74.2%reported reducing alcohol consumption,74.2%reported abstaining from alcohol and smoking,and 20.2%reported consuming more fruits and *** living in the wealthiest households had significantly higher odds of maintaining healthy weight,reducing salt intake,and ***:The findings imply that socioeconomic factors may play important roles in women’s adherence to blood pressure-controlling *** is therefore suggested that policy makers focus on improving women’s economic status as a strategy to encourage cardiovascular health-promoting behavior.

关键词： Economic status education Ghana hypertension blood pressure management behavior women

Distributed Flexible Job-Shop Scheduling Problem Based on Hybrid Chemical Reaction Optimization Algorithm

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Complex System Modeling and Simulation 2022年第2期2卷 156-173页

作者： Jialei li Xingsheng Gu yaya Zhang Xin Zhou laboratory of Smart Manufacturing in Energy Chemical Process Ministry of EducationEast China University of Science and TechnologyShanghai 200237China

Economic globalization has transformed many manufacturing enterprises from a single-plant production mode to a multi-plant cooperative production *** distributed flexible job-shop scheduling problem(DFJSP)has become a research hot topic in the field of scheduling because its production is closer to *** research of DFJSP is of great significance to the organization and management of actual production *** solve the heterogeneous DFJSP with minimal completion time,a hybrid chemical reaction optimization(HCRO)algorithm is proposed in this ***,a novel encoding-decoding method for flexible manufacturing unit(FMU)is ***,half of initial populations are generated by scheduling *** with the new solution acceptance method of simulated annealing(SA)algorithm,an improved method of critical-FMU is designed to improve the global and local search ability of the ***,the elitist selection strategy and the orthogonal experimental method are introduced to the algorithm to improve the convergence speed and optimize the algorithm *** the experimental part,the effectiveness of the simulated annealing algorithm and the critical-FMU refinement methods is firstly ***,in the comparison with other existing algorithms,the proposed optimal scheduling algorithm is not only effective in homogeneous FMUs examples,but also superior to existing algorithms in heterogeneous FMUs arithmetic cases.

关键词： scheduling problem distributed flexible job-shop chemical reaction optimization algorithm heterogeneous factory simulated annealing algorithm

Grain carbon emission transfer and its spatiotemporal shifts based on the increasing supply-demand separation in China over the past three decades

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China Earth Sciences 2023年第5期66卷 1087-1107页

作者： Xinxian QI Xianjin HUANG yaya SONG Danyang WANG Tianze ZHONG Zemiao lIU School of Geography and Ocean Science Nanjing UniversityNanjing210023China Key laboratory of Carbon Neutrality and Territory Optimization Ministry of Natural ResourcesNanjing210023China

The food system is one of the major sources of anthropogenic greenhouse gas(GHG)*** impact of emission transfer due to the separation between food production and consumption within the context of carbon neutrality remains *** this study,we constructed an emission inventory for three types of grains at the production stage of their life cycle and then analysed the spatiotemporal evolution characteristics of the grain supply and *** the use of a spatial equilibrium model,we simulated the spatial distribution flow of the different types of grains from 1990 to 2018 and calculated the resulting GHG emission transfer *** main results include the following:(1)The imbalance between the grain supply and demand intensified,which was mainly reflected in the distance between the geographic centre of the grain supply and consumption increasing 3.2 times,and thus,the self-sufficiency decreased.(2)The total emission transfer TET of rice and wheat decreased because of the increase in the intra-regional supply,while that of maize gradually increased due to the increase in the inter-regional supply.(3)Overall,grain trade improved the carbon efficiency of grain production in *** trade efficiency of crops varied,with wheat and maize leading to overall effective carbon reductions,while the carbon transfer efficiency of rice from trade was relatively low.(4)The carbon footprint of grain production in China's provinces exhibited a downward trend,but due to the intensified separation between the grain supply and demand,certain major grain-producing areas achieved inefficient carbon ***,we suggest further optimization of the spatial structure of planting and breeding,strengthening of the grain supply in the region,and enhancement in the optimization of the low-carbon production structure and adjustment of cultivated land use combined with regional governance *** application of these measures could contribute to achieving d

关键词： Grains life cycle Greenhouse gases Spatial equilibrium Transfer efficiency Spatiotemporal shifts

SIR approach in modeling data packets forwarding at a leaky bucket

在线全文

学校读者我要写书评

暂无评论

International Journal of Modeling, Simulation, and Scientific Computing 2020年第5期11卷 118-130页

作者： Yaming Zhang yaya H.Koura Yanyuan Su School of Economics and Management Yanshan University Qinhuangdao 066004P.R.China

When network users are intensively interacting during rush hour,avoiding data loss and latency is a concern in guaranteeing segment *** a leaky bucket could be needed to achieve flows effective monitoring by generating network of queues at given output *** associated with different sessions and originated from different hosts may be mixed up and queuing delay may become longer,depending on network segment state,buffering strategy,users’behavior among other *** is interesting to assimilate these stages of packets traveling through network segment to the concept of epidemic *** paper proposes a SIR(Susceptible-Infected-Recovered)approach in modeling data packets transmission at a leaky bucket at peak *** focused our analysis on packets buffering and recovery strategy impact on segment forwarding performance in heavy load *** results suggested adapting buffering strategy and packets recovery to enhance transmission and network overall performance.

关键词： Packets transmission buffer occupancy SIR model congestion control

Beginning from the end:the presynaptic terminal as a pathomechanism hub in frontotemporal dementia and amyotrophic lateral sclerosis

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Neural Regeneration Research 2025年第11期20卷 3217-3218页

作者： laura Huggon Emma l.Clayton UK Dementia Research Institute at King’s College london LondonUK Department of Basic and Clinical Neuroscience Institute of Psychiatry Psychology&NeuroscienceKing’s College LondonLondonUK

Frontotemporal dementia and amyotrophic lateral sclerosis:Frontotemporal dementia(F T D)and amyo t rophic lateral sclerosis(AlS)are neurodegenerative diseases with significant overlapping *** these neurodegenerative diseases affect different neuronal populations(with FTD affecting neurons of the frontal and temporal lobes,and AlS affecting upper and lower motor neurons),these two diseases are complexly *** and AlS exist on a disease spectrum,with shared genetic causes,clinical presentations,and pathologies.

关键词： diseases amyotrophic sclerosis