检索结果-南通市图书馆

Possible effects of climate change of wind on aerosol variation during winter in Shanghai,China

Particuology 2015年第3期13卷 80-88页

作者： weidong zhou Xuexi Tie Guangqiang zhou Ping Liang Shanghai Center for Urban Environmental Meteorology Key Laboratory of Aerosol Science and Technology SKLLQGInstitute of Earth EnvironmentChinese Academy of Sciences National Center for Atmospheric Research Shanghai Climate Center

Several data sets were introduced to investigate the possible effects of climate-change-related variation of wind on aerosol concentration during winter in Shanghai, China. These data sets included the daily wind speed, wind direction, visibility, and precipitation from 1956 to 2010, hourly PM10 concentration from 2008 to 2010, and the NCEP/NCAR reanalysis data of global atmospheric circulation from 1956 to 2010. The trend of aerosol concentration and its correlations with wind speed and wind direction in winter were analyzed. Results indicated that there was an increase in the number of haze days in winter of 2.1 days/decade. Aerosol concentration, represented by PMl0 in this study, was highly correlated to both wind speed and direction in winter. The PMl0 concentration increased as wind speed decreased, reaching maximum values under static wind conditions. The PM10 concentration was relatively lower under easterly winds and higher under westerly winds. The analysis showed that weaker East Asia winter monsoons have resulted in a reduction of wind speed, increase in static wind frequency, and decline in the frequency of northerly winds since the 1980s. Moreover, the rapid expansion of urban construction in Shanghai has changed the underlying surface considerably, which has led to a reduction in wind speed. Finally, a wind factor was defined to estimate the combined effects of wind speed and wind direction on aerosol concentrations in Shanghai. The analysis of this factor indicated that changes in atmosphere circulation and urbanization have had important effects on the number of winter haze days in Shanghai.

关键词： AerosolWindClimate changeWinter monsoonShanghai

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

The calculation of the circulation in South China Sea by a diagnostic model

引用

Acta Oceanologica Sinica 2008年第Z1期27卷 31-45页

作者： zhou weidong YANG Yang DONG Danpeng South China Sea Institute of Oceanology Chinese Academy of Science Guangzhou 510301 China South China Sea Institute of Oceanology Chinese Academy of Science Guangzhou 510301 China South China Sea Institute of Oceanology Chinese Academy of Science Guangzhou 510301 China

A high resolved two-dimensional linear global diagnostic model combining with the dynamical calculation is used to calculate velocity field in the South China Sea(SCS). The study of model results shows that eddy diffusion does not change basic structure of circulation in the SCS and does not change the direction of invasive water, but changes the value of transport considerably especially in straits. The velocity field is not changed whether the wind stress is considered or not. This result shows the circulation is largely determined by a density field which well records most of the important contribution of the wind stress effect. Potential vorticity is calculated to testify the dynamics of the model results. The result shows that a good conservation of the nonlinear PV. This indicates most effects of the important nonlinear processes are well recorded in density and the nonlinear term is negligible so that the simplified model is reliable. The model results show the water exchanges between the SCS and open ocean or surrounding seas. Cold deep water invades through Luzon Strait and Warm shallow water is pushed out mainly through Karimata Straits. The model results also reveal the structure of the circulation in the SCS basin. In two circulations of upper and middle layers, a cyclonic one in the north and an anti-cyclonic one in the south, reflect the climatologic average of the circulation driven by monsoon. In the deep or bottom layer, these two circulations reflect the topography of the basin. Above the middle layer, invasive water enters westward in the north but the way of invasion of Kuroshio is not clear. Below the deep layer, a current goes down south near the east basin ,and invasive water enters in the basin from the west Pacific.

关键词： diagnostic model South China Sea potential vorticity circulation

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Nanosecond laser preheating effect on ablation morphology and plasma emission in collinear dual-pulse laser-induced breakdown spectroscopy

引用

Plasma Science and Technology 2022年第11期24卷 145-150页

作者： Na LI Edward HAREFA weidong zhou Key Laboratory of Optical Information Detection and Display Technology of Zhejiang Zhejiang Normal UniversityJinhua 321004People’s Republic of China

Focus-offset collinear dual-pulse laser-induced breakdown spectroscopy is designed and used to investigate the laser ablation and spectral intensity with an aluminum alloy *** laser crater morphologies and ablation volumes were *** inter-pulse time delay dependent ablation efficiency on a nanosecond laser-heated sample was observed,which was similar to the trend of spectral intensity versus inter-pulse time delay in the delay time less than 3μ*** on the observation,the nanosecond pulse laser preheating effect on subsequent second laser ablation and signal enhancement is discussed,which will be helpful for understanding the ablation and signal enhancement mechanism in the standard collinear DP-LIBS technique.

关键词： enhancement mechanism laser ablation crater morphology target preheating

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

LDA-ID:An LDA-Based Framework for Real-Time Network Intrusion Detection

引用

China Communications 2023年第12期20卷 166-181页

作者： weidong zhou Shengwei Lei Chunhe Xia Tianbo Wang Key Laboratory of Beijing Network Technology Beihang UniversityBeijing 100191China School of Cyber Science and Technology Beihang UniversityBeijing 100191China

Network intrusion poses a severe threat to the ***,existing intrusion detection models cannot effectively distinguish different intrusions with high-degree feature *** addition,efficient real-time detection is an urgent *** address the two above problems,we propose a Latent Dirichlet Allocation topic model-based framework for real-time network Intrusion Detection(LDA-ID),consisting of static and online *** problem of feature overlap is transformed into static LDA-ID topic number optimization and topic ***,the detection is based on the latent topic *** achieve efficient real-time detection,we design an online computing mode for static LDA-ID,in which a parameter iteration method based on momentum is proposed to balance the contribution of prior knowledge and new ***,we design two matching mechanisms to accommodate the static and online LDA-ID,*** results on the public NSL-KDD and UNSW-NB15 datasets show that our framework gets higher accuracy than the others.

关键词： feature overlap LDA-ID optimal topic number determination real-time intrusion detection

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Ocean Model Open Boundary Conditions with Volume, Heat and Salinity Conservation Constraints

引用

Advances in Atmospheric Sciences 2014年第1期31卷 188-196页

作者： WANG Qiang zhou weidong WANG Dongxiao DONG Danpeng State Key Laboratory of Tropical Oceanography South China Sea Institute of Oceanology Chinese Academy of Sciences University of Chinese Academy of Sciences

Open boundary conditions （OBCs） for a regional ocean model that can be integrated stably over a long timeframe, as well as satisfy the volume, heat and salinity conservation constraints, were developed. First, the idea that the inward and outward flux information can be treated separately in the OBCs was adopted. Second, in order to maintain the property that the volume, heat and salinity remains conserved in the simulation domain, conservation constraints were added to the OBCs, and an inverse method utilized to solve the constraint equations. Ideal experiments were designed to investigate the conservation property, and the OBCs were found to work efficiently to maintain the volume, heat and salinity conservation. It was found that simulations were comparable to observations when the OBCs were applied to a regional ocean model.

关键词： open boundary conditions modeling inverse method ocean circulation

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Anatomical study of sciatic nerve and common peroneal nerve compression

引用

Neural Regeneration Research 2008年第6期3卷 621-624页

作者： Mingzhao Jia Qing Xia Jinmin Sun Qiang zhou weidong Wang Department of Anatomy Tianjin Medical College Tianjin 300222 China

BACKGROUND： Many diseases of the common peroneal nerve are a result of sciatic nerve injury. The present study addresses whether anatomical positioning of the sciatic nerve is responsible for these injuries. OBJECTIVE： To analyze anatomical causes of sciatic nerve and common peroneal nerve injury by studying the relationship between the sciatic nerve and piriformis. DESIGN, TIME AND SETTING： Observe and measure repeatedly. The experiment was conducted in the Department of Anatomy, Tianjin Medical College between January and June 2005. MATERIALS： Fifty-two adult cadavers 33 males and 19 females, with a total of 104 hemispheres, and fixed with formaldehyde, were provided by Tianjin Medical College and Tianjin Medical University. METHODS： A posterior cut was made from the lumbosacral region to the upper leg, fully exposing the piriformis and path of the sciatic nerve. MAIN OUTCOME MEASURES：（1） Anatomical characteristics of the tibial nerve and common peroneal nerve. （2） According to different areas where the sciatic nerve crosses the piriformis, the study was divided into two types-normal and abnormal. Normal is considered to be when the sciatic nerve passes through the infrapiriform foramen. Remaining pathways are considered to be abnormal. （3） Observe the relationship between the suprapiriform foramen, infrapiriform foramen, as well as the superior and inferior space of piriformis. RESULTS：（1） The nerve tract inside the common peroneal nerve is smaller and thinner, with less connective tissue than the tibial nerve. When pathological changes or variations of the piriformis, or over-abduction of the hip joint, occur, injury to the common peroneal nerve often arises due to blockage and compression. （2） A total of 76 hemispheres （73.08%） were normal, 28 were abnormal （26.92%）. The piriformis can be injured, and the sciatic nerve can become compressed, when the hip joint undergoes intorsion, extorsion, or abduction. （3） The structures between the infrapiriform and supra

关键词： sciatic nerve injury common peroneal nerve disease piriformis

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Nicotine suppresses lipopolysaccharide-induced release of interleukin-6 in mixed glia and microglia-enriched cultures

引用

Neural Regeneration Research 2011年第5期6卷 325-329页

作者： Zhihua Li Qingzan Zhao Hua Zhang Xiuhua Ren Mingfu zhou weidong Zang Department of Human Anatomy Basic Medical College Zhengzhou University Z.hengzhou 450052 Henan Province China

Inflammation plays an important role in the pathogenesis of Parkinson＇s disease （PD） through the over-activation of microglia. Epidemiological studies show that smoking is associated with a lower incidence of PD. This study hypothesized that the neuroprotective effect of nicotine is mediated by modulating the activation of microglia via cytokine release. This study found that nicotine pretreatment suppressed the lipopolysaccharide-induced inflammatory reaction in the nervous system, especially microglia activation and interleukin-6 production. The inhibitory effects of 100 pmol/L nicotine were stronger compared with 1 and 10 iJmol/L nicotine. These findings indicate that nicotine significantly decreases the production of proinflammatory interleukin-6 in mixed glia or microglia-enriched cultures, and plays an inhibitory effect on the lipopolysaccharide-induced inflammatory reaction.

关键词： nicotine glia cytokine lipopolysaccharides Parkinson's disease

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

High-performance flexible BiCMOS electronics based on single-crystal Si nanomembrane

引用

npj Flexible Electronics 2017年第1期1卷 1-7页

作者： Jung-Hun Seo Kan Zhang Munho Kim weidong zhou Zhenqiang Ma Department of Electrical and Computer Engineering University of Wisconsin-MadisonMadisonWI 53706USA Department of Electrical Engineering University of Texas at ArlingtonArlingtonTX 76019USA Department of Materials Design and Innovation University at BuffaloThe State University of New YorkBuffaloNY 14260USA

In this work,we have demonstrated for the first time integrated flexible bipolar-complementary metal-oxide-semiconductor(BiCMOS)thin-film transistors(TFTs)based on a transferable single crystalline Si nanomembrane(Si NM)on a single piece of bendable plastic *** n-channel,p-channel metal-oxide semiconductor field-effect transistors(N-MOSFETs&P-MOSFETs),and NPN bipolar junction transistors(BJTs)were realized together on a 340-nm thick Si NM layer with minimized processing complexity at low cost for advanced flexible electronic *** fabrication process was simplified by thoughtfully arranging the sequence of necessary ion implantation steps with carefully selected energies,doses and anneal conditions,and by wisely combining some costly processing steps that are otherwise separately needed for all three types of *** types of TFTs demonstrated excellent DC and radio-frequency(RF)characteristics and exhibited stable transconductance and current gain under bending ***,Si NM-based flexible BiCMOS TFTs offer great promises for high-performance and multifunctional future flexible electronics applications and is expected to provide a much larger and more versatile platform to address a broader range of ***,the flexible BiCMOS process proposed and demonstrated here is compatible with commercial microfabrication technology,making its adaptation to future commercial use straightforward.

关键词： BiCMOS bipolar performance

来源：

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

A novel approach based on a modified mask R-CNN for the weight prediction of live pigs

引用

Artificial Intelligence in Agriculture 2024年第2期12卷 19-28页

作者： Chuanqi Xie Yuji Cang Xizhong Lou Hua Xiao Xing Xu Xiangjun Li weidong zhou State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-Products Institute of Animal Husbandry and Veterinary ScienceZhejiang Academy of Agricultural SciencesHangzhou 310021China College of Information Engineering China Jiliang UniversityHangzhou 310018China College of Hydraulic Engineering Zhejiang Tongji Vocational College of Science and TechnologyHangzhou 311231China

Since determining the weight of pigs during large-scale breeding and production is challenging,using non-contact estimation methods is *** study proposed a novel pig weight prediction method based on a mod-ified mask region-convolutional neural network(mask R-CNN).The modified approach used ResNeSt as the backbone feature extraction network to enhance the image feature extraction *** feature pyramid net-work(FPN)was added to the backbone feature extraction network for multi-scale feature *** channel at-tention mechanism(CAM)and spatial attention mechanism(SAM)were introduced in the region proposal network(RPN)for the adaptive integration of local features and their global dependencies to capture global in-formation,ultimately improving image segmentation *** modified network obtained a precision rate(P),recall rate(R),and mean average precision(MAP)of 90.33%,89.85%,and 95.21%,respectively,effectively segmenting the pig regions in the *** image features,namely the back area,body length,body width,average depth,and eccentricity,were *** pig depth images were used to build five regression algo-rithms(ordinary least squares(OLS),AdaBoost,CatBoost,XGBoost,and random forest(RF))for weight value *** achieved the best prediction result with a coefficient of determination(R^(2))of 0.987,a mean absolute error(MAE)of 2.96 kg,a mean square error(MSE)of 12.87 kg^(2),and a mean absolute percentage error(MAPE)of 8.45%.The results demonstrated that the machine learning models effectively predicted the weight values of the pigs,providing technical support for intelligent pig farm management.

关键词： Deep learning Modified mask R-CNN Image processing Pig weight Prediction

来源：

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

Recent progress on the modification of high nickel contentNCM:Coating,doping,and single crystallization

引用

Interdisciplinary Materials 2022年第3期1卷 330-353页

作者： Junqing Yan Hao Huang Junfan Tong Wei Li Xiaohang Liu Haoxuan Zhang Heqin Huang weidong zhou State Key Laboratory of Organic-Inorganic Composites Beijing Advanced Innovation Center for Soft Matter Science and EngineeringBeijing University of ChemicalBeijingChina Department of Chemical Catalysts&Battery Materials BASF Advanced Chemicals Co.Ltd.BASF(China)Co.Ltd.ShanghaiChina

High nickel content layered cathodes,represented by NCM(LiNi_(x)Co_(y)Mn_(z)O_(2),x+y+z=1),are now widely employed in the market of electric vehicles,owing to their high energy *** the gradual increase of nickel content and capacity,the issues on cycling life and safety become more *** this review,various strategies for improving the performance of high nickel NCM are summarized on the aspects of surface coating,ionic doping,and singlecrystal *** coating strategy was separately described according to the physical property of coating species,including inert material coating,Li^(+)-conductor coating,electronic conductor coating,and mixed conductor *** coating species help to suppress the interfacial oxidation of electrolytes by NCM,improving the cycling life and *** elemental doping in the crystal lattice of NCM is then presented in the aspects of cation,anion,and mixed-ion doping,which are beneficial to stabilize the layered structure during charge–discharge and so promote the electrochemical *** quite recent years,the strategy of single-crystal NCM was demonstrated to be a promising pathway,owing to the dramatically reduced surface area and grain ***,the remaining unsolved challenges and future strategies for further development of NCM cathode materials are outlined.

关键词： coating doping high nickel NCM layered cathode lithium-ion batteries

来源：

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

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：