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Design and Performance Study of Clutch Disc Assembly of Wide-Angle, Large-Hysteresis, Multistage Damper

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Chinese Journal of Mechanical Engineering 2021年第3期34卷 345-357页

作者： Maoqing Xie Leigang Wang yao huang School of Materials Science and Engineering Jiangsu UniversityZhenjiang 21200China Zhejiang Tieliu Clutch Co. Ltd.Yongkang 321300China

The clutch is an important component of the vehicle driveline *** of its major functions is to attenuate or eliminate the torsional vibration and noise of the driveline system caused by the *** on experiments of vibration damping under different vehicle conditions,the structure and functional principle of a clutch-driven disc assembly for a wide-angle,large-hysteresis,multistage damper is investigated in this study using an innovative combined ***,a systematic integration of key technologies,including wide-angle low-stiffness damping technology,large-hysteresis clutch technology,a novel split pre-damping structure technology,damping structure technology for component cushioning,and multistage damping structure technology,is *** results show that the total torsional angle of the wide-angle large-hysteresis,multistage damper is more than twice that of the traditional clutch *** multistage damping design allows a better consideration of various damping requirements under different vehicle conditions,which can effectively address problems of severe idle vibrations and torsional resonance that occur under idled and accelerated ***,the use of a large-hysteresis structure and wear-resistant materials not only improves the vibration damping performance,but also prolongs the product service life,consequently resulting in multi-faceted optimization and innovative products.

关键词： Clutch Noise Vibration Wide angle Low stiffness Large-hysteresis Multistage damper

Reverse genetics systems for SARS-CoV-2:Development and applications

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Virologica Sinica 2023年第6期38卷 837-850页

作者： Hou-Li Cai yao-Wei huang Department of Veterinary Medicine Zhejiang UniversityHangzhou310058China State Key Laboratory for Animal Disease Control and Prevention South China Agricultural UniversityGuangzhou510642China Guangdong Laboratory for Lingnan Modern Agriculture College of Veterinary MedicineSouth China Agricultural UniversityGuangzhou510642China

The recent emergence of severe acute respiratory syndrome coronavirus 2(SARS-CoV-2)caused serious harm to human health and struck a blow to global economic *** on SARS-CoV-2 has greatly benefited from the use of reverse genetics systems,which have been established to artificially manipulate the viral genome,generating recombinant and reporter infectious viruses or biosafety level 2(BSL-2)-adapted non-infectious replicons with desired *** tools have been instrumental in studying the molecular biological characteristics of the virus,investigating antiviral therapeutics,and facilitating the development of attenuated vaccine ***,we review the construction strategies,development,and applications of reverse genetics systems for SARS-CoV-2,which may be applied to other CoVs as well.

关键词： SARS-CoV-2 Reverse genetics systems Infectious clones Replicons Live attenuated vaccines

Changes in topsoil organic carbon of croplands in China's Mainland over the last two decades

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Chinese Science Bulletin 2006年第15期51卷 1785-1803页

作者： huang yao SUN Wenjuan LAPC Institute of Atmospheric Physics Chinese Academy of Sci ences Beijing 100029 China College of Resources and Environmental Sciences Nanjing Agricultural University Nanjing 210095 China

By searching literature databases, we obtained more than 200 articles published since 1993 that related to the measurements of topsoil organic carbon (SOC) in different regions. To objectively evaluate the changes in the SOC over the last two decades, we selected 132 representative articles from these documented articles. More than sixty thousand soil samples and/or sampling sites were included in the selected articles. Results from ana- lyzing these data sets indicated that the concentra- tion of SOC increased in 53%-59%, decreased in 30%-31% and stabilized in 4%-6% of the national croplands, respectively. A further investigation showed that the total increment of SOC in Chinese croplands ranged from 311.3 Tg to 401.4 Tg. In terms of administrative region, significant increase occurred in eastern and northern China and decrease in northeastern China, respectively. When evaluated by soil great groups, the SOC increased considerably in paddy soils and fluvo-aquic soils and reduced con- spicuously in black soils. The increase of SOC is attributed to the amendments of crop residues and organic manure, the augment of synthetic fertilizer application and the optimal combination of nutrients, and the development of no-tillage and reduced-tillage practice. Water loss and soil erosion and low input induced a great decrease of the SOC in black soils. In order to effectively enhance soil C sequestrations and to greatly control the SOC reduction in north- eastern China, future efforts should be made in de- veloping new techniques, training farmers and con- summating the policy of governmental compensation,by which the application of crop straw, the improve- ment of fertilization, the practice of no-tillage and reduced-tillage, and the control of water loss and soil erosion could be further realized. To respond to the increasing pressure from the Kyoto Protocol thence- forward, four aspects were further addressed for fu- ture research needs, including the quantification of SOC

关键词：表层土农田有机碳中国变迁

Quantification of soil organic carbon sequestration potential in cropland:A model approach

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Science China(Life Sciences) 2010年第7期53卷 868-884页

作者： QIN ZhangCai huang yao State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry(LAPC) Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China

Agroecosystems have a critical role in the terrestrial carbon cycling *** organic carbon(SOC) in cropland is of great importance for mitigating atmospheric carbon dioxide increases and for global food *** an understanding of soil carbon saturation,we analyzed the datasets from 95 global long-term agricultural experiments distributed across a vast area spanning wide ranges of temperate,subtropical and tropical *** then developed a statistical model for estimating SOC sequestration potential in *** model is driven by air temperature,precipitation,soil clay content and pH,and explains 58% of the variation in the observed soil carbon saturation(n=76).Model validation using independent data observed in China yielded a correlation coefficient R2 of 0.74(n=19,P<0.001).Model sensitivity analysis suggested that soils with high clay content and low pH in the cold,humid regions possess a larger carbon sequestration potential than other *** a case study,we estimated the SOC sequestration potential by applying the model in Henan *** estimations suggested that carbon(C) density at the saturation state would reach an average of 32 t C ha-1 in the top 0-20 cm soil *** SOC density in the 1990s as a reference,cropland soils in Henan Province are expected to sequester an additional 100 Tg C in the future.

关键词： cropland model soil organic carbon potential saturation

Using Organic Matter and pH to Estimate the Bulk Density of Afforested/Reforested Soils in Northwest and Northeast China

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Pedosphere 2017年第5期27卷 890-900页

作者： CHEN Yue huang yao SUN Wenjuan State Key Laboratory of Vegetation and Environmental Change Institute of Botany Chinese Academy of Sciences

Regression models for predicting soil bulk density(BD) have usually been related to organic matter content, but it remains unknown whether soil acidity modifies this relationship, particularly for afforested/reforested soils. We measured soil BD along with organic matter content and pH in an afforested/reforested area in Northwest and Northeast China. Using these measurements, we parameterized and validated three BD models: the Adams equation, and exponential and radical models. Model validation showed that the Adams equation failed to predict the BD of the afforested/reforested soils, producing a large overestimation. Incorporation of soil pH into the Adams equation significantly improved its performance. The exponential and radical models parameterized by the measured data simulated soil BD quite well, particularly when soil pH was incorporated. However, incorporation of soil texture variables into these models did not improve model performance compared with the pH-modified models. This led to the conclusion that the Adams equation, exponential, and radical models with pH modification are applicable to afforested/reforested soils with various acidities.

关键词： Adams equation regression model soil bulk density soil organic carbon soil pH

Instant Effects of Radiofrequency Electromagnetic Wave on Hemoglobin in Single Living Intact Red Blood Cell

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Chinese Chemical Letters 2005年第8期16卷 1121-1124页

作者： Cheng Can yao Xiao Kun LI yao Xiong huang College of Pharmacy Jinan University Guangzhou 510630 Institute of Biomedical Engineering Jinan University Guangzhou 510630

The absorption spectrum of the hemoglobin （Hb） in single riving intact red blood cell（RBC）, exposed in 900 MHz radiofrequency electromagnetic wave （RF-EMW）, was non-invasive,in situ, real-time measured by employing a highly sensitive fast multi-channel microspectrophotometer system. Both the absorption intensity and site of intracellular Hb were altered after RBCs were exposed in 900 MHz RF-EMW with power density at 5 mW/cm^2. It was indicated that not only the concentration of Hb in living RBCs was decreased, but the molecular structure of Hb was changed by the RF-EMW action.

关键词： Radiofrequency electromagnetic wave hemoglobin absorption spectrum structure and function.

Determining node duty cycle using Q-learning and linear regression for WSN

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Frontiers of Computer Science 2021年第1期15卷 17-23页

作者： Han yao huang Kyung Tae KIM Hee Yong YOUN College of Software Sungkyunkwan UniversitySuwon 440-746Korea

Wireless sensor network(WSN)is effective for monitoring the target environment,which consists of a large number of sensor nodes of limited *** efficient medium access control(MAC)protocol is thus imperative to maximize the energy efficiency and performance of *** most existing MAC protocols are based on the scheduling of sleep and active period of the nodes,and do not consider the relationship between the load condition and *** this paper a novel scheme is proposed to properly determine the duty cycle of the WSN nodes according to the load,which employs the Q-leaming technique and function approximation with linear *** allows low-latency energy-efficient scheduling for a wide range of traffic conditions,and effectively overcomes the limitation of Q-learning with the problem of continuous state-action ***3 simulation reveals that the proposed scheme significantly improves the throughput,latency,and energy efficiency compared to the existing fully active scheme and S-MAC.

关键词： wireless sensor network media access control duty-cycle scheduling Q-leaming linear regression

Novel Lightweight and Protective Battery System Based on Mechanical Metamaterials

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Acta Mechanica Solida Sinica 2021年第6期34卷 862-871页

作者： yao huang Weihua Guo Jiao Jia Lubing Wang Sha Yin Vehicle Energy and Safety Laboratory(VESL) Department of Automotive EngineeringSchool of Transportation Science and EngineeringBeihang UniversityBeijing100191China Institute of Unmanned System Beihang UniversityBeijing100191China Key Laboratory Impact and Safety Engineering Ministry of Education and Department of Mechanics and Engineering ScienceFaculty of Mechanical Engineering and MechanicsNingbo UniversityNingbo315211ZhejiangChina

The challenges facing electric vehicles with respect to driving range and safety make the design of a lightweight and safe battery pack a critical *** study proposes a multifunctional structural battery system comprising cylindrical battery cells and a surrounding lightweight lattice *** lattice density distribution was optimized via topological optimization to minimize stress on the battery during *** a single 18650 cylindrical battery cell,non-uniform lattices were designed featuring areas of increased density in an X-shaped pattern and then fabricated by additive manufacturing using stainless steel *** testing of the assembled structural battery system revealed that the stronger lattice units in the X-shaped lattice pattern resisted deformation and helped delay the emergence of a battery short ***,the short circuit of the structural battery based on a variable-density patterned lattice was∼166%later than that with a uniform-density *** element simulation results for structural battery systems comprising nine battery cells indicate that superior battery protection is achieved in specially packed batteries via non-uniform lattices with an interconnected network of stronger *** proposed structural battery systems featuring non-uniform lattices will shed light on the next generation of lightweight and impact-resistant electric vehicle designs.

关键词： Lightweight Lattices Metamaterials Structural battery Battery safety Internal short circuit

A super-junction SOI-LDMOS with low resistance electron channel

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Chinese Physics B 2021年第5期30卷 607-612页

作者： Wei-Zhong Chen Yuan-Xi huang yao huang Yi huang Zheng-Sheng Han College of Electronics Engineering Chongqing University of Posts and TelecommunicationsChongqing 400065China Institute of Microelectronics Chinese Academy of SciencesBeijing 100029China University of Chinese Academy of Sciences Beijing 100049China

A novel super-junction LDMOS with low resistance channel(LRC),named LRC-LDMOS based on the silicon-on-insulator(SOI)technology is *** LRC is highly doped on the surface of the drift region,which can significantly reduce the specific on resistance(R^(on,sp))in forward *** charge compensation between the LRC,N-pillar,and P-pillar of the super-junction are adjusted to satisfy the charge balance,which can completely deplete the whole drift,thus the breakdown voltage(BV)is enhanced in reverse *** three-dimensional(3D)simulation results show that the BV and R^(on,sp)of the device can reach 253 V and 15.5 mΩ·cm^(2),respectively,and the Baliga's figure of merit(FOM=BV^(2)/R^(on,sp))of 4.1 MW/cm^(2)is achieved,breaking through the silicon limit.

关键词： LDMOS breakdown voltage(BV) specific on resistance(R_(on,sp)) figure of merit(FOM)