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| 1 | COVID-19 Cases Spread Through the K350 Train-Jilin and Heilongjiang Provinces,China,January 2021显示文摘As of 16∶00 on January 13,2021,95 positive cases of coronavirus disease 2019(COVID-19)were reported in Suihua City of Heilongjiang Province and an additional 35 cases have been linked across 7 cities in 3 provinces:Qiqihar City(7 cases),Mudanjiang City(4 cases),Harbin City(3 cases),and Yichun City(1 case)of Heilongjiang Province;Changchun City(9 cases)and Tonghua City(6 cases)of Jilin Province;and Weihai City of Shandong Province(1 case). | Lei Zhou Laishun Yao Peter Hao Chao Li Qinglong Zhao Huiling Dong Jinhua Dou Shengnan Wang George F.Gao Qun Li Biao Huang | 2021 | China CDC weekly2021，3，8： | 5 |
| 2 | Effects of in-situ TiB_(2)particles on machinability and surface integrity in milling of TiB_(2)/2024 and TiB_(2)/7075 Al composites显示文摘In-situ ceramics particle reinforced aluminum matrix composites are favored in the aerospace industry due to excellent properties.However,the hard ceramic particles as the reinforcement phase bring challenges to machining.To study the effect of in-situ TiB_(2)particles on machinability and surface integrity of TiB_(2)/2024 composite and TiB_(2)/7075 composite,milling experiments were performed,and compared with conventional 2024 and 7075 aluminum alloys.In-situ TiB_(2)particles clustered at the grain boundaries and dispersed inside the matrix alloy grains hinder the dislocation movement of the matrix alloy.Therefore,the milling force and temperature of the composites are higher than those of the aluminum alloys due to the increase of the strength and the decrease of the plasticity.In the milling of composites,abrasive wear is the main wear form of carbide tools,due to the scratching of hard nano-TiB_(2)particles.The composites containing in-situ TiB_(2)particles have machining defects such as smearing,micro-scratches,micro-pits and tail on the machined surface.However,in-situ TiB_(2)particles impede the plastic deformation of the composites,which greatly reduces cutting edge marks on the machined surface.Therefore,under the same milling parameters,the surface roughness of TiB_(2)/2024 composite and TiB_(2)/7075 composite is much less than that of2024 and 7075 aluminum alloy respectively.Under the milling conditions of this experiment,the machined subsurface has no metamorphic layer,and the microhardness of the machined surface is almost the same as that of the material.Besides,compared with 2024 and 7075 aluminum alloy,machined surfaces of TiB_(2)/2024 composite and TiB_(2)/7075 composite both show tensile residual stress or low magnitude of compressive residual stress. | Jie CHEN Weiwei YU Zhenyu ZUO Yugang LI Dong CHEN Qinglong AN Jiwei GENG Ming CHEN Haowei WANG | 2021 | Chinese Journal of Aeronautics2021，34，6： | 5 |
| 3 | How 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 | 2022 | The Crop Journal2022，10，3： | 2 |
| 4 | Introducing Degree Days to Building Thermal Climatic Zoning in China显示文摘Building thermal climatic zoning is a key issue in building energy efficiency.Heating degree days(HDD) and cooling degree days(CDD) are often employed as indexes to represent the heating and cooling energy demand in climatic zoning.However,only using degree days may oversimplify the climatic zoning in regions with complex climatic conditions.In the present study,the application of degree days to current building thermal climatic zoning in China was assessed based on performance simulations.To investigate the key indexes for thermal climatic zoning,the climate characteristics of typical cities were analyzed and the relationships between the climate indexes and heating/cooling demand were obtained.The results reveal that the annual cumulative heating load had a linear correlation with HDD 18 only in regions with small differences in altitude.Therefore,HDD is unsuitable for representing the heating demand in regions with large differences in altitude.A comprehensive index(winter climatic severity index) should be employed instead of HDD,or complementary indexes(daily global solar radiation or altitude) could be used to further divide climate zones.In the current official climatic zoning,the base temperature of 26℃ for CDD is excessively high.The appropriate base temperature range is 18℃ to 22℃.This study provides a reference for selecting indexes to improve thermal climatic zoning in regions with similar climates. | LIU Yan WEN Zeqiu LYU Kailin YANG Liu LIU Jiaping DONG Hong GAO Qinglong | 2023 | Journal of Thermal Science2023，32，3： | 1 |
| 5 | Network-based robust H∞ control of systems with uncertainty显示文摘 | Yue dong Han Qinglong James L | 2005 | Automatica2005，41，6： | 1 |
| 6 | State feedback con- troller design of networked control systems显示文摘 | Yue Dong Han Qinglong Peng Chen | 2004 | IEEE Trans-actions on Circuits and Systems II:Express Briefs2004，51，11： | 1 |
| 7 | Network-based robust H control of systems with uncertainty 显示文摘 | Yue Dong Han QingLong James Lam | 2005 | Automatica2005，41，： | 1 |
| 8 | Networked based robust control of systems withuncert-ain显示文摘 | Dong Yue QingLong Han James Lain | 2005 | Automatica2005，41，： | 1 |
| 9 | Network-based robust H∞ control of systems with uncertainty显示文摘 | Yue Dong Han Qinglong Lam J | 2005 | Automatica2005，41，6： | 1 |
| 10 | State feedback controller design of networked control systems显示文摘 | Yue Dong Han Qinglong Peng Chen | 2004 | IEEE Transactions on Circuits and Systems II:Express Briefs2004，51，11： | 1 |
| 11 | Network-based robust H∞ control of systems with uneertainty显示文摘 | Yue Dong Han Qinglong Lam J | 2005 | Automatica2005，41，： | 1 |
| 12 | To Transmit or not to transmit:a discrete event-triggered communication scheme for networked TakagiSugeno fuzzy systems显示文摘 | Peng Chen Han Qinglong Yue Dong | 2013 | IEEE Transactions on Fuzzy Systems2013，21，1： | 1 |
| 13 | State feedback con- troller Design of networked control systems显示文摘 | Dong Yue Han Qinglong Chen Peng | 2004 | IEEE Transactions on Circuits and Systems II:Express Briefs2004，51，11： | 1 |
| 14 | Network-based robust H① filteringfor uncertain linear systems 显示文摘 | YUE Dong HAN Qinglong | 2006 | IEEE Transactions on SignalProcess2006，54，11： | 1 |
| 15 | Delayed feedback control of uncertain systems with time-varying input delay 显示文摘 | Yue Dong Han Qinglong | 2005 | Automatica2005，41，2： | 1 |
| 16 | Network-based robustcontrol of systems with uncertainty 显示文摘 | Yue Dong Han Qinglong Lam J | 2005 | Automatica2005，41，6： | 1 |
| 17 | Absolute Stability of Lur'e Systems with Time-Varying Delay显示文摘 | Han Qinglong Yue Dong | 2007 | IET Control Theory and Applications2007，1，3： | 1 |
| 18 | State feedback controller design of networked control systems 显示文摘 | YUE Dong HAN Qinglong CHEN Peng | 2004 | Circuits and Systems II : Express Briefs IEEE Transactions on2004，51，11： | 1 |
| 19 | Restructuring Tilth Layers Can Change the Microbial Community Structure and Affect the Occurrence of Verticillium Wilt in Cotton Field显示文摘Restructuring tilth layers(RTL)is a tillage method that exchanges the 0–20 and 20–40 cm soil layers that can be applied during cotton cultivation to increase cotton yield,eliminate weeds and alleviate severe disease,including Verticillium wilt.However,the mechanism by which RTL inhibits Verticillium wilt is unclear.Therefore,we investigated the distribution of microbial communities after rotary tillage(CK)and RTL treatments to identify the reasons for the reduction of Verticillium wilt in cotton fields subjected to RTL.Illumina high-throughput sequencing was used to sequence the bacterial and fungal genes.The disease incidence and severity of Verticillium wilt decreased by 28.57%and 42.64%,respectively,after RTL.Moreover,RTL significantly enhanced bacterial richness and evenness at 20–40 cm and-reduced the differences in fungal evenness and richness between soil depths of 0–20 and 20–40 cm.The number of Verticillium dahliae decreased,while the relative abundance of biocontrol bacteria such as Bacillus and Pseudoxanthomonas increased significantly following RTL.Overall RTL improved bacterial diversity,decreased the number of Verticillium dahliae and increased the relative abundance of biocontrol bacteria,which may have suppressed the occurrence of Verticillium wilt in cotton fields. | Ming Dong Yan Wang Shulin Wang Guoyi Feng Qian Zhang Yongzeng Lin Qinglong Liang Yongqiang Wang Hong Qi | 2023 | Phyton-International Journal of Experimental Botany2023，92，10： | 0 |
| 20 | A new method for deburring of servo valve core edge based on ultraprecision cutting with the designed monocrystalline diamond tool显示文摘Deburring of high-precision components to their micrometer features without any damage is very important but of great difficulty as the burr-to-functionality size ratio increases. To this end, this paper proposes a new deburring method in which the micro burr should be directly removed based on ultraprecision cutting with the designed monocrystalline diamond tool. To determine the feasibility of the proposed method, this paper applies it for deburring of the precision working edge of the servo valve core. Firstly, the monocrystalline diamond tool is carefully designed by covering a variety of topics like rake angle,clearance angle, edge radius. Then, the finite element(FE) simulation was conducted to characterize the deburring performance during the removal of the micro burr produced by the single abrasive grinding. Finally, an innovative self-designed deburring system was introduced and the deburring process was evaluated in terms of cutting forces, temperatures, tool wear mechanisms and deburring quality of the working edges by experiments. The FE simulation results indicate the suitability of the proposed deburring method. Meanwhile, the experimental findings agree well with simulation results and show that ultraprecision cutting with the specialized monocrystalline diamond tool could be successfully used for deburring of servo valve core edge without any damage. This work can provide technical guidance for similar engineering applications, and thus brings an increase to the machining efficiency for the manufacture of precision components. | AN QingLong DANG JiaQiang LIU GongYu Dong DaPeng MING WeiWei CHEN Ming | 2019 | Science China(Technological Sciences)2019，62，10： | 0 |
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