维普中文期刊产品整合服务
84篇 您的检索式:作者名="Jiwang"
    题名 作者 年代 出处 被引量
1Epidemiological and risk analysis of the H7N9 subtype influenza outbreak in China at its early stage显示文摘Dozens of human cases infected with H7N9 subtype avian influenza virus (AIV) have been confirmed in China since March, 2013. Distribution data of sexes, ages, professions and regions of the cases were analyzed in this report. The results showed that the elderly cases, especially the male elderly, were significantly more than expected, which is different from human cases of H5N1 avian influenza and human cases of the pandemic H1N1 influenza. The outbreak was rated as a Grade Ⅲ (severe) outbreak, and it would evolve into a Grade IV (very severe) outbreak soon, using a method reported previously. The H7N9 AIV will probably circulate in humans, birds and pigs for years. Moreover, with the driving force of natural selection, the virus will probably evolve into highly pathogenic AIV in birds, and into a deadly pandemic influenza virus in humans. Therefore, the H7N9 outbreak has been assumed severe, and it is likely to become very or extremely severe in the future, highlighting the emergent need of forceful scientific measures to eliminate any infected animal flocks. We also described two possible mild scenarios of the future evolution of the outbreak.ZHUANG QingYe WANG SuChun WU MeiLi LIU Shuo JIANG WenMing HOU GuangYu LI JinPing WANG KaiCheng YU JianMin CHEN JiMing CHEN JiWang 2013Chinese Science Bulletin2013,58,26:18
2Effects of narrow plant spacing on root distribution and physiological nitrogen use efficiency in summer maize显示文摘The objective of this study was to understand the effects of plant spacing on grain yield and root competition in summer maize(Zea mays L.). Maize cultivar Denghai 661 was planted in rectangular tanks(0.54 m × 0.27 m × 1.00 m) under 27 cm(normal) and 6 cm(narrow) plant spacing and treated with zero and 7.5 g nitrogen(N) per plant. Compared to normal plant spacing, narrow plant spacing generated less root biomass in the 0–20 cm zone under both N rates, slight reductions of dry root weight in the 20–40 cm and 40–70 cm zones at the mid-grain filling stage, and slight variation of dry root weights in the 70–100 cm zone during the whole growth period. Narrow plant spacing decreased root reductive activity in all root zones, especially at the grain-filling stage. Grain yield and above-ground biomass were 5.0% and 8.4% lower in the narrow plant spacing than with normal plant spacing, although narrow plant spacing significantly increased N harvest index and N use efficiency in both grain yield and biomass, and higher N translocation rates from vegetative organs. These results indicate that the reductive activity of maize roots in all soil layers and dry weights of shallow roots were significantly decreased under narrow plant spacing conditions, resulting in lower root biomass and yield reduction at maturity. Therefore, a moderately dense sowing is a basis for high yield in summer maize.Wenshun Jiang Kongjun Wang Qiuping Wu Shuting Dong Peng Liu Jiwang Zhang 2013The Crop Journal2013,1,1:13
3Soil physical properties and maize root growth under different tillage systems in the North China Plain显示文摘The standard cultivation system in the North China Plain is double cropping of winter wheat and summer maize. The main effects of this cultivation system on root development and yield are decreases in soil nutrient content and depth of the plow layer under either long-term no-tillage or rotary tillage before winter wheat sowing and no tillage before summer maize sowing. In this study, we investigated the combined effects of tillage practices before winter wheat and summer maize sowing on soil properties and root growth and distribution in summer maize. Zhengdan 958(ZD958) was used as experimental material, with three tillage treatments: rotary tillage before winter wheat sowing and no tillage before summer maize sowing(RTW + NTM), moldboard plowing before winter wheat sowing and no tillage before summer maize sowing(MPW + NTM), and moldboard plowing before winter wheat sowing and rotary tillage before summer maize sowing(MPW + RTM).Tillage practice showed a significant(P < 0.05) effect on grain yield of summer maize. Grain yields under MPW + RTM and MPW + NTM were 30.6% and 24.0% higher, respectively, than that under RTW + NTM. Soil bulk density and soil penetration resistance decreased among tillage systems in the order RTW + NTM > MPW + NTM > MPW + RTM. Soil bulk densities were 3.3% and 515% lower in MPW + NTM and MPW + RTM, respectively, than that in RTW + NTM, and soil penetration resistances were respectively 17.8% and 20.4% lower,across growth stages and soil depths. Root dry matter and root length density were highest under MPW + RTM, with the resulting increased root activity leading to a yield increase of summer maize. Thus the marked effects of moldboard plowing before winter-wheat sowing on root length density, soil penetration resistance, and soil bulk density may contribute to higher yield.Baizhao Ren Xia Li Shuting Dong Peng Liu Bin Zhao Jiwang Zhang 2018The Crop Journal2018,6,6:10
4New innovations in pavement materials and engineering:A review on pavement engineering research 2021显示文摘Sustainable and resilient pavement infrastructure is critical for current economic and environmental challenges.In the past 10 years,the pavement infrastructure strongly supports the rapid development of the global social economy.New theories,new methods,new technologies and new materials related to pavement engineering are emerging.Deterioration of pavement infrastructure is a typical multi-physics problem.Because of actual coupled behaviors of traffic and environmental conditions,predictions of pavement service life become more and more complicated and require a deep knowledge of pavement material analysis.In order to summarize the current and determine the future research of pavement engineering,Journal of Traffic and Transportation Engineering(English Edition)has launched a review paper on the topic of'New innovations in pavement materials and engineering:A review on pavement engineering research 2021'.Based on the joint-effort of 43 scholars from 24 well-known universities in highway engineering,this review paper systematically analyzes the research status and future development direction of 5 major fields of pavement engineering in the world.The content includes asphalt binder performance and modeling,mixture performance and modeling of pavement materials,multi-scale mechanics,green and sustainable pavement,and intelligent pavement.Overall,this review paper is able to provide references and insights for researchers and engineers in the field of pavement engineering.JTTE Editorial Office Jiaqi Chen Hancheng Dan Yongjie Ding Yangming Gao Meng Guo Shuaicheng Guo Bingye Han Bin Hong Yue Hou Chichun Hu Jing Hu Ju Huyan Jiwang Jiang Wei Jiang Cheng Li Pengfei Liu Yu Liu Zhuangzhuang Liu Guoyang Lu Jian Ouyang Xin Qu Dongya Ren Chao Wang Chaohui Wang Dawei Wang Di Wang Hainian Wang Haopeng Wang Yue Xiao Chao Xing Huining Xu Yu Yan Xu Yang Lingyun You Zhanping You Bin Yu Huayang Yu Huanan Yu Henglong Zhang Jizhe Zhang Changhong Zhou Changjun Zhou Xingyi Zhu 2021Journal of Traffic and Transportation Engineering(English Edition)2021,8,6:7
5Algorithm of Micro-Grooving and Imaging Processing for the Generation of High-Resolution Structural Color Images显示文摘The use of submicron structures for structural coloration of surfaces has broad applications for color filters,projection displays,virtual reality,and anti-counterfeiting.Currently,structural color images lack high resolution due to low manufacturing accuracy.In this study,the axial-feed fly cutting(AFC)method is proposed to fabricate submicron grooves for the diffraction of visible light to create structural color images.We establish the relationship between the color information in the pixels of the original image and the parameters of the array units corresponding to the pixels.An algorithm to determine groove spacing and the tool path is established,and array units with the desired groove spacing are machined to reproduce the structural color images.The submicron grooves fabricated by AFC have high quality and good consistency.Due to the excellent diffraction performance of the machined grooves,images with high saturation and resolution can be reproduced.It is verified that images with various colors can be efficiently fabricated using the proposed method and algorithm.Tianfeng Zhou Yupeng He Tianxing Wang Xiaobin Dong Peng Liu Wenxiang Zhao Yao Hu Jiwang Yan 2020Nanomanufacturing and Metrology2020,3,3:4
6Single-grain cutting based modeling of abrasive belt wear in cylindrical grinding显示文摘A systematic wear model of the cylindrical grinding process with an alumina abrasive belt from the perspective of single grain sliding wear was established in this study.The model consists of three parts:a single cutting force model derived by applying a stress integration method,a single grain wear height analysis based on the wear rate of alumina,and a grinding mileage prediction of multiple grains with Gaussian distributed protrusion heights.Cutting force,single grain wear height and full‐size grinding mileage verification experiments were conducted.The results indicated that the established model was in reasonable agreement with the experimental outcomes,which suggests that this model could be useful in the industry to predict the wear process of abrasive belts.Zhe HE Jianyong LI Yueming LIU Jiwang YAN 2020Friction2020,8,1:4
7Manufacturing technologies toward extreme precision显示文摘Precision is one of the most important aspects of manufacturing.High precision creates high quality,high performance,exchangeability,reliability,and added value for industrial products.Over the past decades,remarkable advances have been achieved in the area of high-precision manufacturing technologies,where the form accuracy approaches the nanometer level and surface roughness the atomic level.These extremely high precision manufacturing technologies enable the development of high-performance optical elements,semiconductor substrates,biomedical parts,and so on,thereby enhancing the ability of human beings to explore the macroand microscopic mysteries and potentialities of the natural world.In this paper,state-of-the-art high-precision material removal manufacturing technologies,especially ultraprecision cutting,grinding,deterministic form correction polishing,and supersmooth polishing,are reviewed and compared with insights into their principles,methodologies,and applications.The key issues in extreme precision manufacturing that should be considered for future R&D are discussed.Zhiyu Zhang Jiwang Yan Tsunemoto Kuriyagawa 2019International Journal of Extreme Manufacturing2019,1,2:3
8Exogenous SA or 6-BA maintains photosynthetic activity in maize leaves under high temperature stress显示文摘With global warming, high-temperature(HT) stress has become a major abiotic stress for crops, in particular summer maize in China. Photosynthesis is sensitive to HT. Salicylic acid(SA) and 6-benzyladenine(6-BA) can improve the adaptation of plants to various biotic and abiotic stresses. However, their contribution to maintaining photosynthetic activity and alleviating photoinhibition in maize leaves under HT stress is still unclear. The effects of exogenous SA or 6-BA on growth, photosynthesis capacity, photosystem Ⅱ(PSII) activity, subcellular ultrastructure, antioxidant system, and plant hormones in maize leaves under HT stress were investigated. Under HT conditions, application of SA or 6-BA up-regulated gibberellin and zeatin content in leaves, increasing leaf area index(LAI). It also expanded the stomata by reducing abscisic acid and jasmonic acid content in leaves, cooling them and increasing CO2supply to photosynthesis. A higher net photosynthetic rate, combined with increased activity of the antioxidant system, alleviated oxidative stress in maize plants sprayed with SA or 6-BA, allowing them to maintain their chloroplast ultrastructure and PSII activity, in particular electron transfer from QAto QB. The increased LAI and net photosynthetic rate per unit leaf area also resulted in the accumulation of more biomass.Yuting Li Xuetao Han Hao Ren Bin Zhao Jiwang Zhang Baizhao Ren Huiyuan Gao Peng Liu 2023The Crop Journal2023,11,2:2
9pH-Dependent Stability of EGX, A Multi-functional Cellulase from Mollusca, Ampullaria crossean显示文摘The cellulase activity and stability of EGX, a multi-functional cellulase previously purified from the mollusca Ampullaria crossean, was systematically studied under different pH. The pH induced con- formation and stability change of EGX have been investigated by using the intrinsic fluorescence, ANS fluorescence and CD spectrum. It has been found that the conformation and activity of this cellulase were strongly dependent on the pH. EGX was stable for both the enzyme activity and the conformation from pH 5.6 to pH 7.4. As shown by intrinsic and ANS fluorescence, no red shift of emission maximum occurred and a negligible intensity change was observed at pH 5.6–7.4. The activity of EGX remained about 80% in pH 5.6–7.4 and obviously decreased out of side the pH range. Urea-induced changes in EGX at pH 5.4 and pH 8.0 were measured by intrinsic fluorescence and CD spectrum. At pH 5.4, a significantly red shift of emission maximum occurred when the concentration of urea was 5 M compared to the concentration was 3 M at pH 8.0. The α-helix at pH 5.4 was 40.51% in the absence of urea and 31.04% in the presence of 4 M urea. At pH 8.0 the α-helix was 7.23% in the presence of 4 M urea. The data indicated that EGX was much susceptible to urea-induced unfolding at pH 8.0 and much stable at pH 5.4. The greater pH dependent stability of EGX may allow the enzyme to adequately catalyze the hydrolysis of cellulosic materials under natural or industrial extreme conditions.Wen-YingLI JiWANG Yan-HongLI MingDING Gen-JunXU Lan-YingLIU Fu-KunZHAO 2004Acta Biochimica et Biophysica Sinica2004,36,9:2
10How delaying post-silking senescence in lower leaves of maize plants increases carbon and nitrogen accumulation and grain yield显示文摘Planting maize at high densities leads to early leaf senescence,and the resulting reduction in the number of lower leaves affects the plant’s root function and lowers its grain yield.However,the nature of the process by which lower leaf senescence affects biomass accumulation and grain yield formation in maize is not clear.This study aimed to shed light on how these factors are related by investigating the effects of the plant growth regulator 6-benzyladenine(6-BA)on the senescence of lower leaves of maize plants.In two maize cultivars planted at densities of 67,500(low density,LD)and 90,000(high density,HD)plants ha^(-1),plants treated with 6-BA maintained a high green leaf area index(LAI)longer than control(CK)plants,enabling them to maintain a higher photosynthetic rate for a longer period of time and produce more biomass before reaching physiological maturity.Spraying the lower leaves of maize plants with a 6-BA solution increased the distribution of;C-photosynthates to their roots,lower leaves and bracts,a result that can be ascribed to a decreased retention of;C-photosynthates in the stem and grain.In both seasons of the experiment,maize plants treated with 6-BA accumulated more N in grain and maintained a higher N content in roots and leaves,especially in lower leaves,than CK.Increased C assimilation in the lower leaves may explain why N uptake in plants subjected to the 6-BA treatment exceeded that in CK plants and why both photosynthesis rate and dry matter accumulation were maintained throughout grain filling.Our results suggest that a suitable distribution of C and N in leaves post-silking may maintain plant root function,increase N use efficiency,maximize the duration of high LAI,and increase grain yield.Rongfa Li Dandan Hu Hao Ren Qinglong Yang Shuting Dong Jiwang Zhang Bin Zhao Peng Liu 2022The Crop Journal2022,10,3:2
11Generating Nanodot Structures on Stainless-Steel Surfaces by Cross Scanning of a Picosecond Pulsed Laser显示文摘Ultrashort pulsed laser-induced periodic surface structures(LIPSS)can be generated on difFerent kinds of materials,which are widely utilized for modifying surface properties such as wettability,adhesion,and tribological,as well as optical performances.Previous studies have focused mainly on one-dimensional LIPSS(i.e.,line structure)generation.In this study,a picosecond pulsed laser was used to irradiate stainless-steel surfaces for generating two-dimensional LIPSS,namely nanodot structures,by cross-scanning the laser beam for a different number of times.The obtained nanodot structures were found to be super hydrophilic just after laser irradiation,but turned to be hydrophobic after exposure in air for a few days.By cross・scanning the laser beam for the same number of times,local LIPSS rewriting was realized.This study showed the possibility of improving the homogeneity of the surface properties of steel materials through laser-induced nanodot structuring.Tomoki Kobayashi Jiwang Yan 2020Nanomanufacturing and Metrology2020,3,2:2
12Toll-like receptor signaling in hematopoietic homeostasis and the pathogenesis of hematologic diseases显示文摘像使用费的受体(TLR ) 在天生的有免疫力的房间被发现,响应感染和织物损坏是快速的煽动性的回答和适当 T 房间激活的必要调停人。积累的证据建议发信号的 TLR 涉及正常造血作用和特定的 hematologic 病理。特别 TLR 和他们的下游的发信号调停人不仅在严重地区分的天生的有免疫力的房间而且在早造血的祖先被表示。TLR 发信号的无菌的激活被要求产生早胚胎的造血的祖先房间。在成年动物,直接或间接地发信号的 TLR 在感染和织物损坏期间在损坏淋巴的房间和造血的干细胞的自强的的情况下支持 myeloid 房间的区别。MyD88 基因的激活的变化,为涉及 TLR 的一个关键适配器编码发信号,是通常在 B 房间检测了淋巴瘤和另外的 B 房间 hematopathologies。发信号的 Dysregulated TLR 贡献许多造血的混乱的致病,包括骨头髓失败, myelodysplastic 症候群,和尖锐 myeloid 白血病。完成正常、病原的造血作用的规定将为造血的混乱的改进处理证明珍贵到指向的治疗和策略的发展的发信号的 TLR 由调停的分子的机制的说明。Joseph Cannova 2015Frontiers of Medicine2015,9,3:2
13Surface coal mining impacts on land use change and ecological service value:a case study in Shengli coalfield,Inner Mongolia显示文摘Coal plays a crucial role in global economic development and remains the most common and widely distributed fossil fuel worldwide.As the world's largest developing country,China's mining and utilization of coal resources have contributed signifcantly to the country’s rapid economic growth.Inner Mongolia is an ecologically fragile arid and semi-arid area of China.The exploitation of opencast mining has seriously hindered the sustainable use of regional land and the residents'well-being.Using ENVI-based remote sensing images from 2000,2005,2010,2015,and 2020,this study employed a random forest algorithm to divide land utilization types into construction land,vegetation,cultivated land,bare land,and water areas and analyzed the characteristics of land use and ecosystem service value changes over the past 20 years.The results were as follows:(1)Construction land in the mining area changed minimally from 2000 to 2020;vegetation and water bodies showed a decreasing trend,whereas bare and cultivated lands showed an increasing trend.Bare land exhibited the largest change in area proportion and water bodies the smallest.(2)The total ecosystem service value of the mining area declined from 10.939 to 9.527 billion Yuan.Vegetation ecosystem service value was the highest,followed by cultivated land and water,with the bare land ecosystem service value the lowest.(3)On a spatial scale,the total ecosystem service value of the Shengli mining area decreased year by year,indicating that land use changes in the mining area do have an impact on ecosystem service value.Lijia Zhang Xu Zhou Yan Zhou Ji Zhou Jiwang Guo Zihan Zhai Yan Chen Xiangyan Su Lingxiao Ying Liwei Wang Ying Qiao 2022International Journal of Coal Science & Technology2022,9,5:1
14Investigation on The Viscoelasticity of Optical Glass in Ultraprecision Lens Molding Process 显示文摘Zhou Tianfeng Yan Jiwang Masudab Jun 2008Journal of Materials Processing Technology(S0924-0136)2008,354,:1
15Modeling high-temperature glass molding process by coupling heat transfer and viscous deformation analysis 显示文摘Yana Jiwang Zhou Tianfeng Masudab Jun 2009Precision Engineering(S0141-6359)2009,33,2:1
16Low-temperature crystallization of Eu-doped red-emitting CaAlSiNB3 from alloy-derived ammonom etallates显示文摘Jiwang Li Tomoaki Watanabe Hiroshi Wada 2007Chem Mater2007,19,:1
17Synthesis of a multinary nitride,Eu-doped CaAlSiNB3 from alloy at low temperatures显示文摘Jiwang Li Tomoaki Watanabe Naonori Sakamoto 2008Chem Mater2008,20,:1
18Moldeing High-temperature Glass Molding Process by Coupling Heat Transfer and Viscous Deformation Analysis显示文摘Yah Jiwang Zhou Tiangfeng MASUDA jun 2009Precision Engineering2009,33,2:1
19Some observations on the wear of diamond tools in ultra-precision cutting of single-crystal silicon显示文摘Jiwang Yan Katsuo Syoji Jun’ichi Tamaki 2003Wear2003,255,:1
20Surface modification and functionalization by electrical discharge coating:a comprehensive review显示文摘Hard coatings are extensively required in industry for protecting mechanical/structural parts that withstand extremely high temperature,stress,chemical corrosion,and other hostile environments.Electrical discharge coating(EDC)is an emerging surface modification technology to produce such hard coatings by using electrical discharges to coat a layer of material on workpiece surface to modify and enhance the surface characteristics or create new surface functions.This paper presents a comprehensive overview of EDC technologies for various materials,and summarises the types and key parameters of EDC processes as well as the characteristics of resulting coatings.It provides a systematic summary of the fundamentals and key features of the EDC processes,as well as its applications and future trends.Pay Jun Liew Ching Yee Yap Jingsi Wang Tianfeng Zhou Jiwang Yan 2020International Journal of Extreme Manufacturing2020,2,1:1
返回顶部 每页显示:
共5页 首页 上一页 第1页 下一页 末页 /5 跳转

网站首页 | 关于我们 | 联系我们 | 产品服务 | 客服中心 | 广告服务 | 版权声明 | 网站联盟 | 友情链接 | 售卡网点

版权所有© 渝B2-20050021-1 渝公网安备 50019002500403号 违法和不良信息举报中心

互联网出版许可证 新出网证(渝)字10号 全国400电话 - 免长途话费