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58篇 您的检索式:作者名="Liwei Yan"
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1Diagnosis, treatment, and prevention of 2019 novel coronavirus infection in children: experts' consensus statement显示文摘Since the outbreak of 2019 novel coronavirus infection (2019-nCoV) in Wuhan City,China,by January 30,2020,a total of 9692 confirmed cases and 15,238 suspected cases have been reported around 31 provinces or cities in China.Among the confirmed cases,1527 were severe cases,171 had recovered and been discharged at home,and 213 died.And among these cases,a total of 28 children aged from 1 month to 17 years have been reported in China.For standardizing prevention and management of 2019-nCoV infections in children,we called up an experts' committee to formulate this experts' consensus statement.This statement is based on the Novel Coronavirus Infection Pneumonia Diagnosis and Treatment Standards (the fourth edition) (National Health Committee) and other previous diagnosis and treatment strategies for pediatric virus infections.The present consensus statement summarizes current strategies on diagnosis,treatment,and prevention of 2019-nCoV infection in children.Kunling Shen Yonghong Yang Tianyou Wang Dongchi Zhao Yi Jiang Runming Jin Yuejie Zheng Baoping Xu Zhengde Xie Likai Lin Yunxiao Shang Xiaoxia Lu Sainan Shu Yan Bai Jikui Deng Min Lu Leping Ye Xuefeng Wang Yongyan Wang Liwei Gao 2020World Journal of Pediatrics2020,16,3:56
2Mapping the hotspots and coldspots of ecosystem services in conservation priority setting显示文摘空间明确地热点和 coldspots 印射是在将保存放为生态系统服务(ES ) 的优先级的一个重要连接。然而,很少研究都没识别并且测试了他们的 ES 热点和 coldspots 的紧密和效率,它可以削弱生态的保存的有效性。在这学习,基于 RUSLE 模型和 Getis-Ord 官方补给 * 统计,我们确定了年度土壤保存服务(SC ) 的变化并且从 2000 ~ 2013 在中国的 Shaanxi 省识别了统计上重要的热点和 coldspots。结果显示那, 1 ) 有高 SC 的区域也介绍了一个显著地增加的趋势,当有低 SC 的区域仅仅稍微变化了时;2 ) SC 热点和 coldspots 证明热点主要是的明显的空间 differentiationthe 空间地在南部的 Shaanxi 聚集了,当 coldspots 主要在 Guanzhong 盆和沙多风的高原被散布时;并且 3 ) 识别热点有提供 SC 的最高的能力,与提供的 29.6% 全部的区域, 59.7% 总数满足。相反, coldspots 占据了 46.3% 全部的区域,但是仅仅提供了 17.2% 全部的 SC。除了保存单个 ES, Getis-Ord 官方补给 * 统计方法能也帮助为保存多重 ES 和生物多样性识别多功能的优先级区域。LI Yingjie ZHANG Liwei YAN Junping WANG Pengtao HU Ningke CHENG Wei FU Bojie 2017Journal of Geographical Sciences2017,27,6:19
3IL-10-producing regulatory B cells restrain the T follicular helper cell response in primary Sjögren’s syndrome显示文摘Increased numbers of T follicular helper(Tfh)cells have been implicated in the development of autoimmune diseases including primary Sjögren’s syndrome(pSS),but how the Tfh cell response is regulated during autoimmune pathogenesis remains largely unclear.Here,we first found negative correlations between IL-10^(+)regulatory B(Breg)cell numbers and Tfh cell responses and disease activity in patients with pSS and mice with experimental Sjögren’s syndrome(ESS).Moreover,we detected high expression of IL-10 receptor on Tfh cells and their precursors in both humans and mice.In culture,IL-10 suppressed human and murine Tfh cell differentiation by promoting STAT5 phosphorylation.By using an adoptive transfer approach and two-photon live imaging,we found significantly increased numbers of Tfh cells with enhanced T cell homing into B cell follicles in the draining cervical lymph nodes of RAG-2−/−mice transferred with IL-10-deficient B cells during ESS development compared with those of RAG-2−/−mice transferred with wild-type B cells.In ESS mice,CD19^(+)CD1d^(hi)CD5^(+)Breg cells with decreased IL-10 production exhibited severely impaired suppressive effects on T cell proliferation.Consistently,CD19^(+)CD24^(+)CD38^(hi) Breg cells from pSS patients showed significantly reduced IL-10 production with defective inhibitory function in the suppression of autologous Tfh cell expansion.Furthermore,the adoptive transfer of IL-10-producing Breg cells markedly suppressed the Tfh cell response and ameliorated ESS progression in ESS mice.Together,these findings demonstrate a critical role for IL-10-producing Breg cells in restraining the effector Tfh cell response during pSS development.Xiang Lin Xiaohui Wang Fan Xiao Kongyang Ma Lixiong Liu Xiaoqi Wang Dong Xu Fei Wang Xiaofei Shi Dongzhou Liu Yan Zhao Liwei Lu 2019Cellular & Molecular Immunology2019,16,12:13
4Metal-Organic Framework Nanocarriers for Drug Delivery in Biomedical Applications显示文摘Investigation of metal–organic frameworks(MOFs)for biomedical applications has attracted much attention in recent years.MOFs are regarded as a promising class of nanocarriers for drug delivery owing to well-defined structure,ultrahigh surface area and porosity,tunable pore size,and easy chemical functionalization.In this review,the unique properties of MOFs and their advantages as nanocarriers for drug delivery in biomedical applications were discussed in the first section.Then,state-ofthe-art strategies to functionalize MOFs with therapeutic agents were summarized,including surface adsorption,pore encapsulation,covalent binding,and functional molecules as building blocks.In the third section,the most recent biological applications of MOFs for intracellular delivery of drugs,proteins,and nucleic acids,especially aptamers,were presented.Finally,challenges and prospects were comprehensively discussed to provide context for future development of MOFs as efficient drug delivery systems.Yujia Sun Liwei Zheng Yu Yang Xu Qian Ting Fu Xiaowei Li Zunyi Yang He Yan Cheng Cui Weihong Tan 2020Nano-Micro Letters2020,12,8:10
5A new perylene diimide-based colorimetric and fluorescent sensor for selective detection of Cu^(2+) cation显示文摘A new perylene diimide (PDI) ligand (1) functionalized with a dipicolylethylenediamine (DPEN) moiety was synthesized and first used as a colorimetric and fluorometric dual-channel sensor to specifically detect the presence of Cu2+ over a wide range of other cations. The solution of 1 (10 μmol/L) upon ad-dition of Cu2+ displayed distinguishing pink color compared with other cations including K+,Ni2+,Ca2+,Mn2+,Na+,Sr2+,Zn2+,Co2+,Cd2+,Mg2+,Cr3+,Ag+,and Ba2+,indicating the sensitivity and selectivity of 1 to Cu2+. Thus,the advantage of this assay is that naked-eye detection of Cu2+ becomes possible. More-over,among these metal ions investigated,only Cu2+ quenched more than half fluorescent intensity of 1. The ESI-TOF spectrum of a mixture of 1 and CuCl2 in combination of the fluorescence titration spectra of 1 (10 μmol/L) upon addition of various amounts of Cu2+ revealed the formation of a 2︰1 metal-ligand complex through the metal coordination interaction.YAN LiWei,YANG Li,LAN JingBo & YOU JingSong Key Laboratory of Green Chemistry and Technology of Ministry of Education,College of Chemistry,and State Key Laboratory of Biotherapy,West China Hospital,West China Medical School,Sichuan University,Chengdu 610064,China 2009Science China Chemistry2009,52,4:6
6Standardized Operational Protocol for Human Brain Banking in China显示文摘With the progress of society, there is an increasing need to tackle disorders of the central nervous system. Human brain tissue, unlike animal tissues, is an irreplaceable resource for the study of neurological diseases (1)Aimed at scientific research and education, the roles of human brain tissue repositories are to acquire brain tissue from donors, prepare, process, and preserve collected samples,provide tissue to specific eligible facilities, and determine the characteristics of each tissue sample.Wenying Qiu Hanlin Zhang Aimin Bao Keqing Zhu Yue Huang Xiaoxin Yan Jing Zhang Chunjiu Zhong Yong Shen Jiangning Zhou Xiaoying Zheng Liwei Zhang Yousheng Shu Beisha Tang Zhenxin Zhang Gang Wang Ren Zhou Bing Sun Changlin Gong Shumin Duan Chao Ma 2019Neuroscience Bulletin2019,35,2:6
7Controlled-release neurotensin-loaded silk fibroin dressings improve wound healing in diabetic rat model显示文摘Diabetic foot ulcers(DFU),which may lead to lower extremity amputation,is one of the severe and chronic complications of diabetic mellitus.This study aims to develop,and use dressings based on Silk fibroin(SF)as the scaffold material,gelatin microspheres(GMs)as the carrier for the neurotensin(NT),a neuropeptide that acts as an inflammatory modulator in wound healing and NT as accelerate wound healing drug to treat DFU.We evaluated the wound healing processes and neo-tissue formation in rat diabetic model by macroscopic observation,histological observation(H&E staining and Masson's trichrome staining)and immunofluorescence analysis at 3,7,14,21 and 28 post-operation days.Our results show that the NT/GMs/SF group performance the best not only in macroscopic healing and less scars in 28 post-operation days,but also in fibroblast accumulation in tissue granulation,collagen expression and deposition at the wound site.From release profiles,we can know the GMs are a good carrier for control release drugs.The SEM results shows that the NT/GMs/SF dressings have an average pore size are 40–80μm and a porosity of∼85%,this pore size is suit for wound healing regeneration.These results suggest that the NT/GMs/SF dressings may work as an effective support for control release NT to promote DFU wound healing.Jianghui Liu Liwei Yan Wei Yang Yong Lan Qiyu Zhu ongjie Xu Canbin Zheng Rui Guo 2019Bioactive Materials2019,4,1:5
8Formation Mechanism and Numerical Model of Quartz in Fine-Grained Organic-Rich Shales: A Case Study of Wufeng and Longmaxi Formations in Western Hubei Province, South China显示文摘The difference in quartz types in shales not only affects the porosity and permeability of the rocks,but also reflects the difference in the sedimentary environments.We established the formation mechanism and numerical model of quartz in shales of Wufeng and Longmaxi formations in the Wangjiawan Section,South China,based on thin-section studies using SEM(scanning electron microscope),SEM-CL(cathodoluminescence),XRD(X-ray diffraction)and geochemical analyses.There are two types of quartz in the shales:detrital quartz and authigenic quartz.Detrital quartz is mostly silt-size,typically ranging from 10 to 60μm in size and subangular to angular monocrystal in shape,and brighter than authigenic quartz by CL intensity;authigenic quartz is present in two phases in shape:grain overgrowths and crystallite grains.Overgrowth surfaces are subhedral.Crystallite grains are typically less than 10μm in size,euhedral or subhedral monocrystal in shape.Authigenic quartz can be subdivided into biogenic quartz and clay mineral transformed quartz according to the source of silicon.In the numerical model,the content of detrital quartz is relatively consistent(20%);the content of biogenic quartz ranges from 40%to 70%,with a sharp fall(0–30%)in the Guanyinqiao mudstone.During the Katian,a lower anoxic and dense water column make the dissolution of biogenic silica well preserved.Biogenic quartz is the major contributor to the sediment.During the early Hirnantian interval,due to the drop of sea level and the oxygenation of seafloor,the sediment is mainly composed of clay transformed quartz and detrital quartz.During the latest Hirnatian and Rhuddanian,rapid sea level rise and anoxic ocean enhance the preservation of the biogenic silica,thereby biogenic quartz re-emerges as the major contributors to the sediment.Authigenic crystallite grains and grain overgrowths have filled in primary pore space and have decreased the interparticle porosity,however,as a rigid framework,they can suppress compaction and maintain the internal pore structure.The formation of authigenic quartz results in the increase of total quartz,which fortifies the brittleness of rocks and is beneficial to the development of shale gas.Bao Zhang Detian Yan Hassan Jasmine Drawarh Xiangrong Yang Jin He Liwei Zhang 2020Journal of Earth Science2020,31,2:4
9Energy-Optimal Braking Control Using a Double-Layer Scheme for Trajectory Planning and Tracking of Connected Electric Vehicles显示文摘Most researches focus on the regenerative braking system design in vehicle components control and braking torque distribution,few combine the connected vehicle technologies into braking velocity planning.If the braking intention is accessed by the vehicle-to-everything communication,the electric vehicles(EVs)could plan the braking velocity for recovering more vehicle kinetic energy.Therefore,this paper presents an energy-optimal braking strategy(EOBS)to improve the energy efficiency of EVs with the consideration of shared braking intention.First,a double-layer control scheme is formulated.In the upper-layer,an energy-optimal braking problem with accessed braking intention is formulated and solved by the distance-based dynamic programming algorithm,which could derive the energy-optimal braking trajectory.In the lower-layer,the nonlinear time-varying vehicle longitudinal dynamics is transformed to the linear time-varying system,then an efficient model predictive controller is designed and solved by quadratic programming algorithm to track the original energy-optimal braking trajectory while ensuring braking comfort and safety.Several simulations are conducted by jointing MATLAB and CarSim,the results demonstrated the proposed EOBS achieves prominent regeneration energy improvement than the regular constant deceleration braking strategy.Finally,the energy-optimal braking mechanism of EVs is investigated based on the analysis of braking deceleration,battery charging power,and motor efficiency,which could be a guide to real-time control.Haoxuan Dong Weichao Zhuang Guodong Yin Liwei Xu Yan Wang Fa’an Wang Yanbo Lu 2021Chinese Journal of Mechanical Engineering2021,34,5:3
10New insights into follicular helper T cell response and regulation in autoimmune pathogenesis显示文摘Follicular helper T (Tfh) cells play a key role in driving B cell activation and differentiation during germinal center reactions in immune responses and autoimmune development, and these cells are characterized by high expression of CXCR5, PD1, ICOS, IL-21 and BCL6. Increasing evidence indicates that the functional dysregulation of Tfh cells contributes to the pathogenesis of autoimmune diseases, including primary Sjögren’s syndrome (pSS), which is a common autoimmune disease characterized by lymphocytic infiltration and tissue inflammation in salivary glands (SGs) and lacrimal glands that leads to dry mouth and dry eyes.1 Here, we provide a brief commentary on recent advances in understanding the Tfh cell response with a focus on new insights into Tfh cell regulation and therapeutic implications in autoimmune diseases.Fan Xiao Man Han Ke Rui Xiangyan Ai Jie Tian Wen Zhang Futao Zhao Yan Zhao Quan Jiang Liwei Lu 2021Cellular & Molecular Immunology2021,18,6:3
11Stability,Thermal Conductivity and Photothermal Conversion Performance of Water-Based ZnO Nanofluids显示文摘Water-based ZnO nanofluids were prepared via the two-step method,and the influences of dispersant type and mass fraction on the stability and particle size distribution of the nanofluids were investigated.The spectral transmittances of the nanofluids were obtained by a UV-Vis-NIR spectrophotometer.Thermal conductivities of the nanofluids with various mass fractions were measured at different temperatures and a fitted nonlinear correlated equation was established for low-concentration application and compared with existing models.The photothermal conversion performance of the nanofluids was evaluated by theoretical and experimental methods at three optical depths.The results showed that,CTAB as the dispersant provides better physical stability of water-based ZnO nanofluids than SDBS or GA does.Effect of the temperature on the nanofluid thermal conductivity is remarkable with the increase of nanoparticle mass fraction,especially in the range 55°C to 75°C.The maximum thermal conductivity of the studied nanofluids is 0.9488 W/(m·℃)at 75°C,43.61%higher than that of water.The minimum thermal conductivity of the studied nanofluids is 0.6376 W/(m·℃)at 25°C,5.16%higher than that of water.The photothermal conversion performance of the nanofluids is quite good with a maximum average absorption efficiency of 0.47,135%higher than that of water(η=0.2),and the maximum SAR is 527.5 W/g.HAN Xiaofei LU Liwei YAN Suying YANG Xiaohong TIAN Rui ZHAO Xiaoyan 2021Journal of Thermal Science2021,30,5:3
12Facile synthesis of hierarchical Na2Fe(SO4)2@rGO/C as high-voltage cathode for energy density-enhanced sodium-ion batteries显示文摘Fe-based sulfates are ideal cathode candidates for sodium-ion batteries(SIBs) owing to their high operating voltage and low cost but suffer from the nature of poor power performance. Herein, a hierarchical porous Na2Fe(SO4)2@reduced graphene oxide/carbon dot(Na2Fe(SO4)2@rGO/C) with low carbon content(4.12 wt%) was synthesized via a facile homogeneous strategy benefiting for engineering application,which delivers excellent sodium storage performance(high voltage plateau of 3.75 V, 85 m Ah g-1 and330 Wh kg-1 at 0.05 C;5805 W kg-1 at 10 C) and high Na+diffusion coefficient(1.19 × 10-12 cm2 s-1).Moreover, the midpoint voltage of assembled full cell could reach 3.0 V. The electron transfer and reaction kinetics are effectively boosted since the nanoscale Na2Fe(SO4)2 is supported by a robust crosslinked carbon matrix with rGO sheets and carbon dots. The slight rGO sheets sufficiently enhance the electron transfer like a current collecter and restrain the aggregation, as well as ensure smooth ion channels. Meanwhile, the carbon dots in the whole space connect with Na2Fe(SO4)2 and help rGO to promote the conductivity of the electrode. Ex-situ X-ray powder diffraction and X-ray photoelectron spectrometry analysis confirm the high reversibility of this sodiation/desodiation process.Ge Yao Xixue Zhang Yongliang Yan Jiyu Zhang Keming Song Juan Shi Liwei Mi Jinyun Zheng Xiangming Feng Weihua Chen 2020Journal of Energy Chemistry2020,29,11:3
13Home visits in brain tumor patient: how nurse and family members cooperate in tumor patient's family self-care显示文摘Purposes:We reported the roles and functions of nurses in home visits for brain tumor patients using the family health assessment guide in the study.Methods:One patient of brain glioma was chosen as the case illustration.The nurses assessed the patients’situation,their families and living environment individually.All these factors were analyzed together.Results:The nurses then implemented their knowledge and skills to adopt different measures in different conditions,investigated the patients’health problems and carried out personalized effective actions.Conclusions:Nurses should put effort into community nursing to allow patients to live in a safe environment,to satisfy the health needs of human being and their needs for health knowledge,and enhance their self-care abilities.Liwei Lang Zhiyue Yan Hailiang Tang 2013Chinese Journal of Cancer Research2013,25,6:2
14REMOTE SENSING OF ALGAL BLOOMS USING A TURBIDITY-FREE FUNCTION FOR NEAR-INFRARED ANDRED SIGNALS显示文摘This article presents a method for real- time mapping of algal blooms in turbid coastal waters using the remote sensing reflectance of red band (Channel 1, 580-680 nm) and near-infrared band (Channel 2, 720-1100 nm) of the AVHRR sensor on the NOAA series satellites. A turbidity-free function for near-infrared and red signals, α0 = (bb(1)/bb(2))(a(2)/ a(1)) based on the first order bb/(a+bb) model deduc-ing equation Rrs(2)?1 = α0 Rrs(1) ?1+ g?1 (1?α0), were se-lected as a chlorophyll-a related index for detecting algal blooms, and the algal blooms with chlorophyll-a concentration of 64-256 mg/L could be defined by window of 1.6 < α0 < 5.2 and 0.01< Rrs(2)/g < 0.2. Such turbidity-free two-band method is supported by both sea-truth data and remote sensing experiment for an algal blooms event on the near-shore water off the Minjiang estuary of southeastern China during early June of 2003. Comparisons of this algorithm with other published algorithms, one-band method (i.e. method of bright water) or two-band methods (i.e. method of ratio, method of NDVI, and method of subtracting) have suggested that the turbidity-free function method could be regarded as a standard algorithm in capabilities of AVHRR imagery or other high resolution but wide near-infrared and red band imagery for detecting algal blooms events in coastal waters.LI Yan SHANG Shaoling ZHANG Caiyun MA Xiaoxin HUANG Liwei WU Jingyu ZENG Yindong 2006Chinese Science Bulletin2006,51,4:2
15Surface 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
16Hydrogen-saturated saline protects intensive narrow band noise-induced hearing loss in guinea pigs through an antioxidant effect显示文摘Liwei C Ning Y Yan L 2014PLoS One2014,9,10:1
17On the Euclidean Distance of Images显示文摘Wang Liwei Zhang Yan Feng Jufu 0,,08:1
18On the euclidean distance of images显示文摘Wang Liwei Zhang Yan Feng Jufu 2000IEEE Transaction On Pattern Analysis And Machine Intelligence2000,27,8:1
19Frequent Deletion of Fas Gene Sequences Encoding Death and Transmembrane Domains in Nasal Natural Killer/T-Cell Lymphoma显示文摘Lijun Shen Anthony C.T. Liang Liwei Lu Wing Yan Au Yok-Lam Kwong Raymond H.S. Liang Gopesh Srivastava 2002The American Journal of Pathology2002,,6:1
20On the Euclidean distance of images显示文摘Wang Liwei Zhang Yan Feng Jufu 2005IEEE Transactions on Pattern Analysis and Machine Intelligence2005,27,8:1
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