检索结果-南通市图书馆

Guidelines for Acute Ischemic Stroke Treatment

在线全文

学校读者我要写书评

暂无评论

Neuroscience Bulletin 2020年第10期36卷 1229-1232页

作者： Shuwei Qiu yun xu Department of Neurology Drum Tower HospitalMedical School and The State Key Laboratory of Pharmaceutical BiotechnologyInstitute of Brain ScienceNanjing UniversityNanjing 210008China Jiangsu Key Laboratory for Molecular Medicine Medical School of Nanjing UniversityNanjing 210008China Jiangsu Province Stroke Center for Diagnosis and Therapy Nanjing 210008China Nanjing Medical Center for Neurology Nanjing 210008China

Acute ischemic stroke(AIS)is one of the serious diseases endangering human health worldwide;it usually leads to serious handicap with a high risk of recurrence and *** the global burden of stroke,great advances are still being *** the publication of the 2013 guidelines for the early management of AIS patients,new high-quality evidence has resulted in prominent changes in the evidence-based treatment of AIS,such as image assessment.

关键词： Acute diseases spite

在线全文

学校读者我要写书评

暂无评论

基于液晶回音壁模式传感的光谱标定方法研究

光谱学与光谱分析 2025年第1期45卷 30-37页

作者：麻镇宇李晓强刘永军严云翔哈尔滨工程大学纤维集成光学教育部重点实验室黑龙江哈尔滨150001 哈尔滨工程大学海洋光子材料与器件物理工业和信息化部重点实验室黑龙江哈尔滨150001 哈尔滨工程大学青岛创新发展中心山东青岛266000

液晶回音壁模式(WGM)传感技术结合了液晶材料的高敏感性和光学WGM的高精度特性,在物质检测、环境监测和生物医疗等领域具有广阔的应用前景。为提升传感测量的精度和灵敏度,除了改善传感器的结构特性以外,如提高品质因子、实现窄线宽、... 详细信息

液晶回音壁模式(WGM)传感技术结合了液晶材料的高敏感性和光学WGM的高精度特性,在物质检测、环境监测和生物医疗等领域具有广阔的应用前景。为提升传感测量的精度和灵敏度,除了改善传感器的结构特性以外,如提高品质因子、实现窄线宽、提升波长移动范围等,准确标定WGM光谱谱线是一个重要内容。然而,实际应用中,WGM光谱的非规则分布给谱线标定带来了挑战。本文针对此问题提出了一种基于Savitzky-Golay(SG)滤波和高斯平滑的WGM非规则光谱标定方法,并提出了光谱标定的对称性、高线性和合理性三原则。将WGM光谱标定分为规则和非规则两类。对于规则光谱,具有良好的洛伦兹线型和高斯包络轮廓,可以选择最高强度谱线或中心波长,或者具有相同自由光谱范围(FSR)的相邻模式谱线作为谐振波长。而对于非规则光谱,可以分为三类:(1)光谱缺峰和强度突变,主要由于谐振条件的损耗变化所致;(2)光谱非规则劈裂,液晶微腔中可能存在微小的缺陷或杂质,导致光谱的非对称劈裂;(3)混合型变化光谱,受到复杂测量环境的影响,可能出现多种不规则变化。通过SG滤波和高斯平滑处理,有效地恢复光谱的对称性,提升拟合线性度,实现光谱标定。为验证该方法的有效性,根据不同类型光谱标定情况,分别设计了利用液晶WGM对不同生物分子的传感实验,包括胰蛋白酶(浓度0.75~2.00μg·mL^(-1))、pH(4.55~6.86)、DNA(浓度90~490μg·mL^(-1))等。实验结果表明,采用本文方法和三原则进行液晶WGM光谱标定和谐振峰选取,传感灵敏度的线性度均在0.99以上,具有较好的可靠性和稳定性。该研究创新之处在于提出了针对液晶WGM光谱非规则分布的有效标定方法和三原则,为提高液晶WGM传感测量的准确性和有效性提供了有效解决方案和重要的理论和方法支持,具有重要的应用和理论意义。

关键词：液晶回音壁模式光谱标定 Savitzky-Golay滤波

Differentially private feature selection under MapReduce framework

在线全文

学校读者我要写书评

暂无评论

The Journal of China Universities of Posts and Telecommunications 2013年第5期20卷 85-90,103页

作者： CHEN Kai WAN Wen-qiang LI yun College of Computer Science Nanjing University of Posts and Telecommunications Jiangsu High Technology Research Key Laboratory for Wireless Sensor Networks Nanjing University of Posts and Telecommunications Institute of Computer Technology Nanjing University of Posts and Telecommunications

Privacy preserving data mining algorithms are crucial for the personal data analysis, such as medical and financial records. This paper focuses on feature selection and proposes a new privacy preserving distributed algorithm, which can effectively select features based on differential privacy and Gini index under the MapReduce framework. At the same time, the theoretic analysis for privacy guarantee is also presented. Some experiments are conducted on bench-mark datasets, the simulation results indicate that during the selection of important features, the proposed algorithm can preserve privacy information to a certain extent with less time cost than on centralized counterpart.

关键词： data mining feature selection differential privacy MapReduce

The primary influence of shear band evolution on the slope bearing capacity

在线全文

学校读者我要写书评

暂无评论

Journal of Rock Mechanics and Geotechnical Engineering 2023年第4期15卷 1023-1037页

作者： Lanting Wei qiang xu Shanyong Wang xu Ji Chengdu University of Technology ChengduChina Priority Research Centre for Geotechnical Science and Engineering School of EngineeringUniversity of NewcastleNewcastleAustralia

Slope bearing capacity is one of the most important characteristics in slope engineering and is strongly influenced by weak planes,loading conditions,and slope *** presenting the evolution of slip surfaces,this paper explored how the slope bearing capacity is affected by widely observed influencing *** initiation and propagation of slip surfaces are presented in laboratory model tests of slope using the transparent soil *** band evolution under various weak planes,loading conditions,and slope geometries were experimentally presented,and slope bearing capacities were analyzed with the process of shear band *** paper verified that slip surface morphologies have a strong relation with the slope bearing *** same slip surface morphology can have different evolutionary *** this case,it is the shear band evolution that determines the slope bearing capacity,not the morphology of the slip *** influencing factors such as pre-existing weak planes,loading conditions,and slope geometry strongly affect the slope bearing capacity as these factors govern the process of shear band evolution inside the slope.

关键词： Slope bearing capacity Shear band evolution Failure mechanism Transparent soil

Blow-up of Solutions for a Time-space Fractional Evolution System

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

Acta Mathematica Sinica,English Series 2013年第6期29卷 1067-1074页

作者： Yong qiang xu Zhong TAN Department of Mathematics and Information Sciences Zhangzhou Normal University School of Mathematical Sciences Xiamen University

In this paper, firstly, we study the local existence and uniqueness of mild solutions for fractional evolution systems with nonlocal in time nonlinearity. Then, we claim that such a mild solution is weak solution of t... 详细信息

关键词： Local existence fractional integrals and derivatives evolution systems

Seasonal and Annual Variations of CO_2 Fluxes in Rain-Fed Winter Wheat Agro-Ecosystem of Loess Plateau, China

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Agriculture 2013年第1期12卷 147-158页

作者： WANG Wen LIAO yun-cheng GUO qiang College of Agronomy Northwest A&F University

To accurately evaluate the carbon sequestration potential and better elucidate the relationship between the carbon cycle and regional climate change, using eddy covariance system, we conducted a long-term measurement of CO 2 fluxes in the rain-fed winter wheat field of the Chinese Loess Plateau. The results showed that the annual net ecosystem CO 2 exchange （NEE） was （-71.6±5.7） and （-65.3±5.3） g C m-2 y-1 for 2008-2009 and 2009-2010 crop years, respectively, suggesting that the agro-ecosystem was a carbon sink （117.4-126.2 g C m-2 yr-1）. However, after considering the harvested grain, the agro- ecosystem turned into a moderate carbon source. The variations in NEE and ecosystem respiration （R eco ） were sensitive to changes in soil water content （SWC）. When SWC ranged form 0.15 to 0.21 m3 m-3, we found a highly significant relationship between NEE and photosynthetically active radiation （PAR）, and a highly significant relationship between R eco and soil temperature （T s ）. However, the highly significant relationships were not observed when SWC was outside the range of 0.15-0.21 m3 m-3. Further, in spring, the R eco instantly responded to a rapid increase in SWC after effective rainfall events, which could induce 2 to 4-fold increase in daily R eco , whereas the R eco was also inhibited by heavy summer rainfall when soils were saturated. Accumulated R eco in summer fallow period decreased carbon fixed in growing season by 16- 25%, indicating that the period imposed negative impacts on annual carbon sequestration.

关键词： CO 2 flux carbon sequestration soil water content rainfall event rain-fed winter wheat agro-ecosystem

An Efficient Federated Learning Framework Deployed in Resource-Constrained IoV:User Selection and Learning Time Optimization Schemes

在线全文

学校读者我要写书评

暂无评论

China Communications 2023年第12期20卷 111-130页

作者： qiang Wang Shaoyi xu Rongtao xu Dongji Li School of Electronics and Information Engineering Beijing Jiaotong UniversityBeijing 100044China National Mobile Communications Research Laboratory Southeast UniversityNanjing 210096China

In this article,an efficient federated learning(FL)Framework in the Internet of Vehicles(IoV)is *** the considered model,vehicle users implement an FL algorithm by training their local FL models and sending their models to a base station(BS)that generates a global FL model through the model *** each user owns data samples with diverse sizes and different quality,it is necessary for the BS to select the proper participating users to acquire a better global ***,considering the high computational overhead of existing selection methods based on the gradient,the lightweight user selection scheme based on the loss decay is *** to the limited wireless bandwidth,the BS needs to select an suitable subset of users to implement the FL ***,the vehicle users’computing resource that can be used for FL training is usually limited in the IoV when other multiple tasks are required to be *** local model training and model parameter transmission of FL will have significant effects on the latency of *** address this issue,the joint communication and computing optimization problem is formulated whose objective is to minimize the FL delay in the resource-constrained *** solve the complex nonconvex problem,an algorithm based on the concave-convex procedure(CCCP)is proposed,which can achieve superior performance in the small-scale and delay-insensitive FL *** to the fact that the convergence rate of CCCP method is too slow in a large-scale FL system,this method is not suitable for delay-sensitive *** solve this issue,a block coordinate descent algorithm based on the one-step projected gradient method is proposed to decrease the complexity of the solution at the cost of light performance *** are conducted and numerical results show the good performance of the proposed methods.

关键词： block coordinate descent concave-convex procedure federated learning learning time resource allocation

Generalized Hybrid Nanofluid Model with the Application of Fully Developed Mixed Convection Flow in a Vertical Microchannel

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2019年第8期71卷 903-911页

作者： Hang xu qiang Sun State Key Laboratory of Ocean Engineering School of Naval Architecture Ocean and Civil Engineering Shanghai Jiao Tong University Shanghai 200240 China Particulate Fluids Processing Centre Department of Chemical Engineering The University of Melbourne Parkville VIC 3010 Australia

The fully developed mixed convection hybrid nanofluid flow in a vertical microchannel is examined in *** simplified hybrid model that omits the nonlinear terms due to the interaction of different nanoparticle volumetric fractions is derived and compared with the existing *** generalized model describing hybrid nanofluid suspended with multiple kinds of solid particles is *** argument that the corresponding nanofluid solutions obtained by the homogenous model can be recovered from the results of the regular problems through simple arithmetic operations is *** in similarity form for this flow problem are formulated by means of a set of similarity *** effects of various parameters on important physical quantities are analyzed and discussed.

关键词： hybrid nanofluid vertical channel mixed convection slippery effect

Journal’s responsibility in maintaining scientifc integrity

在线全文

学校读者我要写书评

暂无评论

World Journal of Pediatrics 2022年第1期18卷 1-3页

作者： Li-Li Yang Si-yun xu Zhi-Yi Yang Zheng-Yan Zhao qiang Shu National Clinical Research Center for Child Health National Children’s Regional Medical CenterChildren’s HospitalZhejiang University School of MedicineHangzhou 310052China

Scientifc integrity has been regarded as a priority in scientifc development in China[1].The Chinese governmental agencies have paid unprecedented attentions on promoting scientifc integrity in recent *** May 2018,the Communist Party of China Central Committee and the State Council issued guidelines on promoting scientifc integrity[2].Ever-harsher punishments for researchers who committing scientifc misconduct were introduced by the Chinese government[3].In November,2018,43 penalties for major academic misconduct were endorsed by 41 national government ***,the Ministry of Science and Technology of China(MOST)were established a notifcation system for reporting cases involving in scientifc misconduct and the related penalties publicly.

关键词： integrity scient Communist