检索结果-南通市图书馆

DNL-16:A new zeolitic layered silicate unraveled by three-dimensional electron diffraction

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

chinese Journal of Structural chemistry 2024年第4期43卷 4-6页

作者： chao Ma Peng Guo Zhongmin Liu School of chemistry Dalian University of TechnologyDalianLiaoning116024China National engineering Research center of Lower-carbon catalysis technology Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalianLiaoning116023China University of chinese Academy of Sciences Beijing100049China

two-dimensional(2D)zeolitic layered silicates(ZLSs)are drawing increasing attention since they have large external surface areas,easy convenience for further pillaring or exfoliating for desirable properties,and even promising candidates for constructing novel three-dimensional(3D)zeolites[1,2].From the structural point of view,basic building units SiO4 in ZLSs are interconnected through sharing the bridging oxygen atoms.

关键词： layered silicate SiO4

A promising application of bulk metallic glasses in torque sensor

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(technological Sciences) 2024年第8期67卷 2505-2514页

作者： LU WenHao MA Jiang WANG chao LIU YanHui Institute of Physics Chinese Academy of SciencesBeijing 100190China Shenzhen Key Laboratory of High Performance Nontraditional Manufacturing College of Mechatronics and Control EngineeringShenzhen UniversityShenzhen 518060China

torque sensors are essential components of robotic joints. In the past, structure optimization of force-sensing elements has been the common approach to improve the performance of the torque sensors. In this work, we demonstrate a torque sensor with bulk metallic glasses as a force-sensing element. compared with the sensors made of stainless steel and aluminum alloy, the use of bulk metallic glass as a force-sensing element significantly improves sensor sensitivity, linearity, repeatability, hysteresis, and measuring range. Our work not only opens up a new avenue for the application of bulk metallic glasses, but also provides opportunities for enhancing the performance of force/torque sensors through materials optimization.

关键词： bulk metallic glasses amorphous alloys force sensors

同方期刊数据库

Off-farm employment,agriculture production activities,and household dietary diversity in environmentally and economically vulnerable areas of Asia

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Agriculture 2024年第2期23卷 359-373页

作者： Yunli Bai Xuanye Zeng chao Fu Linxiu Zhang Key Laboratory of ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China United Nations environment Programme-International ecosystem Management Partnership(UNeP-IeMP) Beijing 100101China University of chinese Academy of Sciences Beijing 100101China

Access to off-farm employment has been expected to be a critical approach to ending hunger and all forms of malnutrition,two important targets of achieving Zero *** study aims to investigate the role of off-farm employment in improving dietary diversity through substitution effect and complementary effect with agricultural production activities and income *** study adopts Poisson/tobit/Probit/OLS regressions and the instrument variable method based on the primary survey data collected among 1,282 households at 12 sites in environmentally and economically vulnerable areas of china,Nepal,cambodia,thailand,and Myanmar in *** results show that off-farm employment is positively associated with household dietary diversity and the consumption of flesh meat,fish and other aquatic animals,fruits,and milk and dairy products,which are rich in protein and *** results of mechanism analysis show that off-farm employment contributes to household dietary diversity by improving crop diversity,especially for poor households,boosting the probability of livestock raising for households with the middle one-third disposal income,and increasing household *** positive association between off-farm employment and household dietary diversity is much higher for households with the bottom one-third disposal income,low illiteracy,and from upper-middle income *** findings imply that off-farm employment does play a vital role in achieving multiple benefits of poverty alleviation,malnutrition reduction,and agrobiodiversity conservation in environmentally and economically vulnerable ***,it may enlarge the gaps in dietary diversity between households with low human capital and from low and lower-middle income countries and those with high human capital and from middle-high countries.

关键词： off-farm employment dietary diversity income effect substitution effect complementary effect

A novel predictive braking energy recovery strategy for electric vehicles considering motor thermal protection

在线全文

学校读者我要写书评

暂无评论

Science china(technological Sciences) 2024年第4期67卷 1253-1269页

作者： YANG chao SUN tongLin YANG LiuQuan ZHANG YuHang WANG WeiDa School of Mechanical engineering Beijing Institute of TechnologyBeijing 100084China

Braking energy recovery(BeR)aims to recover the vehicle's kinetic energy by coordinating the motor and mechanical braking torque to extend the driving range of the electric vehicle(eV).to achieve this goal,the motor/generator mode requires frequent switching and prolonged operation during *** this case,the motor temperature will unavoidably rise,potentially triggering motor thermal protection(MtP).Activating MtP increases the risk of motor component failure,and the eV typically disables the BeR ***,maximizing BeR while reducing the risk of motor overheating is a challenging *** address this issue,this article proposes a predictive BeR strategy with MtP using the non-smooth Pontryagin Minimum Principle(NSPMP)for ***,a Markov long short-term memory(MLStM)model is designed to obtain future velocity ***,the BeR problem with MtP in the studied eV is embedded in a model predictive control(MPc)***,under the MPc framework,the NSPMP strategy is proposed to resolve the problem of ***,the performance of the proposed strategy is verified through simulation and a hardware-in-loop *** results show that in two real-world driving cycles,compared to the rule-based strategy,the proposed strategy reduced power consumption by 1.24%and0.96%,respectively,and effectively limited motor ***,under global cycle conditions,this strategy demonstrated better MtP control performance compared to other benchmark strategies.

关键词： electric vehicle braking energy recovery strategy motor thermal protection non-smooth PMP

Fatigue crack Propagation Law of corroded Steel Box Girders in Long Span Bridges

在线全文

学校读者我要写书评

暂无评论

computer Modeling in engineering & Sciences 2024年第7期140卷 201-227页

作者： Ying Wang Longxiao chao Jun chen Songbai Jiang Key Laboratory of concrete and Prestressed concrete Structures of Ministry of education School of Civil EngineeringSoutheast UniversityNanjing211189China Jiangsu Provincial engineering construction Standard Station Nanjing210036China

In order to investigate the fatigue performance of orthotropic anisotropic steel bridge decks,this study realizes the simulation of the welding process through elastic-plastic finite element theory,thermal-structural sequential coupling,and the birth-death element *** simulated welding residual stresses are introduced into the multiscale finite element model of the bridge as the initial ***,the study explores the impact of residual stress on crack propagation in the fatigue-vulnerable components of the corroded steel box *** results indicate that fatigue cracks at the weld toe of the top deck,the weld root of the top deck,and the opening of the transverse diaphragm will not propagate under the action of a standard vehicle ***,the inclusion of residual stress leads to the propagation of these *** considering residual stress,the fatigue crack propagation paths at the weld toe of the transverse diaphragm and the U-rib weld toe align with those observed in actual *** the absence of residual stress,the cracks at the toe of the transverse diaphragm with a 15%mass loss rate are categorized as type I ***,when residual stress is considered,these cracks become I-II composite *** stress significantly alters the cumulative energy release rate of the three ***,incorporating the influence of residual stress is essential when assessing the fatigue performance of corroded steel box girders in long-span bridges.

关键词： Residual stress crack propagation corroded steel box girder cumulative energy release rate

enhanced degradation of refractory organics in ORR-eO system with a blue tiO_(2)nanotube array modified ti-based Ni-Sb co-doped SnO_(2)anode

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

chinese chemical Letters 2024年第8期35卷 391-395页

作者： Yifen He chao Qu Na Ren Dawei Liang Department of Materials chemistry School of Materials Science&EngineeringBeihang UniversityBeijing 102206China Department of environmental Science Faculty of Environment&LifeBeijing University of TechnologyBeijing 100124China

Recently,a novel 2-electron oxygen reduction reaction(ORR)based electro-oxidation(eO)system was developed,which utilizes a H_(2)O_(2)generation cathode instead of H_(2)evolution cathode.A ti-based Ni-Sb co-doped SnO_(2)(ti/NAtO)anode was selected for efficient degradation of refractory organics and O_(3)*** synergistic reaction of O3/H_(2)O_(2)further accelerated the generation of hydroxyl radicals(·OH)in the ORR-eO ***,the catalytic activity and long-term effectiveness of the ti/NAtO anode limited the large-scale application of the ORR-eO *** this study,a blue tiO_(2)nanotube array(blue-tiO_(2)-NtA)inter-layer was introduced into the fabrication process between the ti substrate and NAtO catalyst *** to the ti/NAtO anode,the ti/blue-tiO_(2)-NtA/NAtO anode achieved higher efficiency of organic removal and O_(3)***,the accelerated lifetime of the ti/blue-tiO_(2)-NtA/NAtO anode was increased by 7 times compared to the ti/NAtO *** combined with cNts-c/PtFe air cathode in ORR-eO system,all anodic oxidation and O_(3)/H_(2)O_(2)processes achieved higher•OH *** 92%of tOc in leachate bio-effluent was effectively eliminated with a relatively low energy cost of 45 kWh/t.

关键词： electro-oxidation Blue tiO_(2)nanotube array O_(3)/H_(2)O_(2)process Refractory organics Leachate bio-effluent

Impacts of inter-satellite links on the ecOM model performance for BDS-3 MeO satellites

在线全文

学校读者我要写书评

暂无评论

Satellite Navigation 2024年第1期5卷 140-154页

作者： chao Yang Jing Guo Xiaolong Xu Longyu Wang Qile Zhao GNSS Research center Wuhan UniversityNo.129 Luoyu RoadWuhan430079China

Inter-satellite link(ISL)plays an essential role in current and future Global Navigation Satellite System(GNSS).In this study,we investigate the impact of ISL observations on precise orbit determination for BeiDou-3 Navigation Satellite System(BDS-3)Medium earth Orbit(MeO)satellites based on different extended cODe Orbit Models(ecOM).thanks to the better observation geometry of the Ka-band ISL data compared to the L-band data for BDS-3 MeO satellites,the ISL solution substantially reduces Orbit Boundary Discontinuity(OBD)errors,except for c30,which suffers from unstable Ka-band hardware *** the external quality analysis,ISL significantly enhances the reliability of the orbit of MeO satellites manufactured by the china Academy of Space technology(cASt).the standard deviation(StD)of the satellite laser ranging(SLR)residuals is approximately 2.5 cm,and the root mean square(RMS)is reduced by 10–23%compared to L-band ***,the Sun-elongation angle dependent systematic error in SLR residuals nearly vanishes based on the reduced 5-parameter ecOM(ecOM1)or extended 7-parameter ecOM(ecOM2)with ISL *** is because the ISL reduces the correlation between state parameters and solar radiation pressure(SRP)parameters as well as those among SRP parameters,leading to a more accurate estimation of both orbit and SRP perturbations,particularly those along B *** confirms that the deficiency of the SRP models for BDS-3 cASt satellites can be compensated by using better observation geometry from ISL *** the other hand,for the satellite manufactured by Shanghai engineering center for Microsatellites(SecM),the ISL allows for a more accurate estimation of the Bc_(1)parameter in the ecOM1 *** only reduces linear systematic error,possibly because the impact generated by the satellite bus cannot be entirely absorbed by the B-direction parameters.

关键词： BDS-3 MeO Inter-satellite link Solar radiation pressure ecOM

A new type of lipophilic hydrophobic self-repairing cellulose insulating paper developed with St-110/FAS/PtFe ternary system as coating substrate

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

High Voltage 2024年第2期9卷 474-483页

作者： Zhenglin Zeng Jinshan Qin Zuhao Wang Weimin tan chao tang college of engineering and technology Southwest UniversityChongqingChina International R&D center for New technologies of Smart Grid and equipment ChongqingChina

the moisture generated by the ageing of the oil-paper insulating system can easily lead to the deterioration of the performance of the insulating *** order to alleviate the impact of moisture on the performance of the insulating paper,we developed a kind of lipophilic hydrophobic self-repairing cellulose insulating paper(new insulating paper)based on the ternary system of polytetrafluoroethylene,fluorocarbon surfactant and fluorinated alkyl silane,and accelerated thermal ageing test for 45 days at 130°c was carried *** experimental results show that the new insulating paper with excellent lipophilic property can realise hydrophobic self-repairing through heat treatment after physical *** tensile strength and elongation at break of the new insulating paper increased by 5%–8%and 6.25%–27%respectively compared with the original cellulose insulating *** the end of ageing,the relative dielectric constant and dielectric loss factor of new insulating paper are 10.4%and 9.9%lower than that of the original cel-lulose insulating paper,while the breakdown voltage is 6.8%*** acid and moisture content produced during the ageing process of the insulating oil impregnated with new insulating paper are also less,indicating that the coating can delay the ageing of the insulating paper.

关键词： coating moisture cellulose

Understanding Discrepancy of Power System Dynamic Security Assessment with Unknown Faults: A Reliable transfer Learning-based Method

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

cSee Journal of Power and energy Systems 2024年第1期10卷 427-431页

作者： chao Ren Han Yu Yan Xu Zhao Yang Dong School of computer Science and engineering Nanyang Technological UniversitySingapore School of electrical and electronic engineering Nanyang Technological UniversitySingapore

this letter proposes a reliable transfer learning(RtL)method for pre-fault dynamic security assessment(DSA)in power systems to improve DSA performance in the presence of potentially related unknown *** takes individual discrepancies into consideration and can handle unknown faults with incomplete *** experiment results demonstrate high DSA accuracy and computational efficiency of the proposed RtL *** analysis shows RtL can guarantee system performance.

关键词： Adversarial training dynamic security assessment maximum classifier discrepancy missing data transfer learning