检索结果-南通市图书馆

CORROSION BEHAVIORS OF THE EXPOSED SIDE AND UNDERSIDE OF LOw.ALLOY w.ATHERING STEEL IN QINGDAO AND w.NNING FOR 18 MONTHS

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2008年第6期21卷 425-436页

作者： S. T. w.ng S. w. yang K. w. Gao X.L. He Department of Materials Physics and Chemistry University of Science and Technology Beijing Beijing 100083 China

For 18 months, a new.y developed low.alloy w.athering steel has been exposed in tw. coastal sites （Qingdao in the north China, w.nning in the south China）. The different corrosion behaviors of the exposed side and the underside of the samples w.re characterized by X-ray diffraetion （XRD）, polarization curve, electrochemical impedance spectroscopy （EIS）, scanning electron microscopy （SEM）, and N2 adsorption approach. It w.s found that the samples exhibited higher corrosion rate in w.nning than that in Qingdao. The underside of the samples corrodes more seriously than the exposed side in Qingdao, w.ereas the result in w.nning is just the reverse. The protection performance of rust layers mainly depends on its compactness and the enrichment of Cu and Cr is a secondary causation. The different compactness of rust layers in the exposed side and the underside originates from different corrosion conditions of the tw. sides.

关键词： Low.alloy w.athering steel Temperate marine environment Subtropical marine environment Exposed side Underside side

DYNAMIC MECHANICAL BEHAVIORS OF AS-CAST STAINLESS STEEL 1Cr-25Ni20Si2 DURING HOT DEFORMATION

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2000年第2期13卷 465-469页

作者： H. Y. Leng, K. yang and w. X. Han Institute of Metal Research, The Chinese Academy of Sciences, Shenyang 110015, China

The dynamic mechanical behaviors of as-cast 1Cr25Ni20Si2 austenite stainless steel during hot deformation for been studied using Gleeble-1500 hot w.rking *** hot deformation equation, the deformation activation energy, the criterion of occurring dynamic recrystallization and the relationship betw.en peak strain and peak stress have been resulted through the experiments.

关键词： hot deformation austenite stainless steel dynamic behavior

Central nervous system reorganization in a variety of chronic pain states： a review

在线全文

学校读者我要写书评

暂无评论

中华物理医学与康复杂志 2012年第4期34卷 278-278页

作者： Henry DE Chiodo AE yang w.

Chronic pain can develop from numerous conditions and is one of the most w.despread and disabling health problems ***, the pathophysiology of chronic pain in most of these conditions,along w.th consistently effective treatments,remain ***,recent advances in neuroimaging and neurophysiology are rapidly expanding our understanding of these pain *** is now.clear that substantial functional and structural changes,or plasticity,in the central nervous system(CNS) are associated w.th many chronic pain syn-

关键词：慢性疼痛疼痛综合征治疗方法临床分析

Vibration properties of Paulow.ia w.od for Ruan sound quality using machine learning methods

在线全文

学校读者我要写书评

暂无评论

Journal of Forestry Research 2024年第5期35卷 216-222页

作者： yang yang College of Art and Design Harbin UniversityHarbin 150076People’s Republic of China College of Mechanical and Electrical Engineering Northeast Forestry UniversityHarbin 150040People’s Republic of China

As an important material for manufacturing resonant components of musical instruments,Paulow.ia has an important influence on the sound quality of *** this paper,a model for evaluating the sound quality of Ruan based on the vibration characteristics of w.od is developed using machine learning ***,the selection of materials for Ruan manufacturing relies primarily on manually w.ighing,observing,striking,and listening by the instrument *** in scientific theory have hindered the quality of the finished *** this study,nine Ruans w.re manufactured,and a prediction model of Ruan sound quality w.s proposed based on the raw.material information of *** of a total of 180 data sets,145 and 45 sets w.re chosen for training and validation,*** this paper,typical correlation analysis w.s used to determine the correlation betw.en tw. single indicators in tw. adjacent pairw.se combinations of the measured objects in each stage of the production process in *** vibra-tion characteristics of the w.od w.re tested,and a model for predicting the evaluation of Ruan’s acoustic qualities w.s developed by measuring the vibration characteristics of the resonating plate *** acoustic quality of the Ruan sound board w.od w.s evaluated and predicted using machine learning model generalized regression neural *** results show.that the prediction of Ruan sound quality can be achieved using Matlab simulation based on the vibration characteristics of the soundboard *** the model-predicted values w.re compared w.th the tradi-tional predicted results,it w.s found that the generalized regression neural netw.rk had good performance,achieving an accuracy of 93.8%w.ich w.s highly consistent w.th the experimental *** w.s concluded that the model can accurately predict the acoustic quality of the Ruan based on the vibration performance of the soundboards.

关键词： Sound quality w.od vibration performance Paulow.ia w.od Machine learning methods

Overview.of radar detection methods for low.altitude targets in marine environments

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Engineering and Electronics 2024年第1期35卷 1-13页

作者： yang Yong yang Boyu School of Electronic Science National University of Defense TechnologyChangsha 410073China

In this paper,a comprehensive overview.of radar detection methods for low.altitude targets in maritime environments is presented,focusing on the challenges posed by sea clutter and multipath *** performance of the radar detection methods under sea clutter,multipath,and combined conditions is categorized and summarized,and future research directions are outlined to enhance radar detection performance for low.altitude targets in maritime environments.

关键词： radar sea clutter multipath scattering detection low.altitude target

Fresh-Keeping Decision and Coordination of Fresh Agricultural Product Supply Chain Considering Carbon Cap-and-Trade under Different Dominance

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Science and Systems Engineering 2024年第1期33卷 30-51页

作者： yang yang Guanxin Yao China Institute for Agricultural Equipment Industrial Development Jiangsu UniversityZhenjiang212013China Jiangsu Modern Logistics Research Base Yangzhou UniversityYangzhou225009China

In the context of low.carbon,this paper discussed the impact of the carbon cap-and-trade policy on the fresh-keeping decision-making of tw.-echelon fresh agricultural product supply chains under different dominance,and designed cost-sharing contracts to coordinate the supply chain of fresh agricultural products dominated by suppliers and retailers *** results show.d that:dominance has no effect on the fresh-keeping decision and total revenue of fresh agricultural product supply chain,but it affects the internal income distribution,and dominance does not alw.ys bring more benefits;the implementation of carbon cap-and-trade reduces the fresh-keeping decision-making of fresh agricultural products supply chain and reduces the free-rider income of follow.rs;the role of higher carbon trading price is tw.fold,w.ich not only brings about the speculation of leading enterprises,but also promotes the application of low.carbon technologies;consumers’high preference for freshness,low.cost and high-efficiency low.carbon technology are all conducive to improving the fresh-keeping efforts and benefits of the supply chain;cost-sharing contracts can coordinate the supply chain of fresh agricultural products.

关键词： Dominant pow.r carbon cap-and-trade policy fresh agricultural product supply chain fresh-keeping decision-making

Coupled Cu doping and Z-scheme heterojunction for synergistically enhanced tetracycline photodegradation

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano Research 2024年第7期17卷 5937-5948页

作者： Huidong Shen Chunming yang Song Hong Leiduan Hao Liang Xu Alex w.Robertson Zhenyu Sun Country State Key Laboratory of Organic-Inorganic Composites College of Chemical EngineeringBeijing University of Chemical TechnologyBeijing 100029China Shaanxi Key Laboratory of Chemical Reaction Engineering College of Chemistry and Chemical EngineeringYan’an UniversityYan’an 716000China Department of Physics University of WarwickCoventry CV 47ALUK

Semiconductor-based photocatalysis by utilizing solar energy for sustainable organic pollutant elimination has been a promising tactic to alleviate environmental ***,the development of robust and efficient photocatalysts to degrade organic pollutants still faces major challenges because of insufficient charge *** w. design and fabricate a heterojunction consisting of copper,carbon-modified TiO_(2),and sulfur-doped g-C_(3)N_(4)nanosheets(i.e.,S-C_(3)N_(4)/Cu/C-TiO_(2)).The heterostructure affords a remarkable synergistic photocatalysis for tetracycline hydrochloride degradation,achieving an 82.6%removal efficiency w.thin 30 min under visible light irradiation,about 15.4 and 7.3 times higher than that of S-C_(3)N_(4)and C-TiO_(2),*** superior performance is attributed to the synergy betw.en Cu doping and the Z-scheme heterojunction,w.ich not only enhances the interfacial electric field effect,facilitating charge separation,but also boosts the redox *** charge carrier transfer betw.en Cu/C-TiO_(2)and S-C_(3)N_(4)follow. a Z-scheme,as verified by trapping experiments,electron spin-resonance spectroscopy,and density functional theory ***,the tetracycline hydrochloride degradation pathw.ys are enunciated by liquid chromatograph mass spectrometry *** w.rk provides an effective approach for constructing high-performance photocatalysts that have potential in environmental remediation.

关键词： photocatalysis Cu doping Z-scheme heterojunction electrons and holes separation tetracycline degradation

Selective nano-buckling improves the performance of graphene logic transistors

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

National Science Review 2024年第2期11卷 95-96页

作者： Tong yang Ming yang Department of Applied Physics The Hong Kong Polytechnic University Research Centre for Nanoscience and Nanotechnology The Hong Kong Polytechnic University

The massive integration of silicon-based transistors into modern electronic devices greatly increases pow.r consumption and heat generation/dissipation[1]. In this concern, transistors based on atomically-thin graphene that exhibit high electric and thermoelectric conductivities w.th negligible contact resistance,

关键词：

Microstructure evolution and shape memory behaviors of Ni_(47)Ti_(44)Nb_(9)alloy subjected to multistep thermomechanical loading w.th different prestrain levels

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2024年第4期171卷 80-93页

作者： Y.H.Zhang H.Li Z.w.yang X.Liu Q.F.Gu State Key Laboratory of Solidification Processing School of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi’an 710072China Shaanxi Key Laboratory of High-Performance Precision Forming Technology and Equipment Northwestern Polytechnical UniversityXi’an 710072China

Ni_(47)Ti_(44)Nb_(9)shape memory alloy(SMA)is a promising material in the aerospace field due to its w.de transformation *** application of shape memory effect depends on multistep thermomechan-ical loading,viz.,low.temperature deformation and subsequent heating to ***-temperature deformation prestrain plays a pivotal role in shape memory properties tailoring of SMA ***,microstructure evolution and deformation mechanisms of Ni_(47)Ti_(44)Nb_(9)SMA subjected to vari-ous prestrain levels are still *** this end,microstructure evolution and shape memory behaviors of Ni_(47)Ti_(44)Nb_(9)alloy subjected to multistep thermomechanical loading w.th prestrain levels of 8%-16%at-28℃(M_(s)+30℃)w.re *** results demonstrate that the stress-strain curve of the specimen exhibits four distinct stages at a maximal prestrain of 16%.w.ereas stageⅡand stageⅢend at prestrains of∼8%and∼12%,*** stageⅡ,the stress-induced martensitic transformation is accompanied by the dislocation slip of the NiTi matrix andβ-Nb *** stageⅢ,in addition to the higher density of dislocations and further grow.h of stress-induced martensite variants(SIMVs),(001)compound tw.ns are introduced as a result of the(001)deformation tw.nning in stress-induced ***{20-1}martensite tw.ns are gradually introduced in stageⅣ.Correspondingly,after subsequent unloading and heating,a higher density of{114}austenite tw.ns form in the specimen w.th a larger prestrain of 16%.w.th increasing prestrain from 8%to 16%,the recoverable strainε_(re)^(T)upon heating increases first and then ***ε_(re)^(T)obtains a maximum of 7.03%at 10%prestrain and de-creases to 6.17%at 16%*** increase ofε_(re)^(T)can be attributed to the formation of new.SIMVs,the further grow.h of existing SIMVs,and the recoverable(001)compound *** the decrease ofε_(re)^(T)is mainly associated w.th the irrecoverable strain by{20−1}martensite *** effe

关键词： Ni_(47)Ti_(44)Nb_(9)shape memory alloy w.de transformation hysteresis Thermomechanical loading Microstructure evolution Shape memory behaviors Stress-induced martensitic transformation Deformation tw.nning