资源类型

期刊论文 21

年份

2023 2

2022 3

2021 1

2020 2

2019 1

2018 2

2017 1

2016 2

2015 2

2014 1

2012 1

2010 1

2008 1

展开 ︾

关键词

(GaxIn1−x)2O3薄膜；带隙可调谐；磁控溅射 1

/III-V界面 1

Cu(Inx 1

Ga1–x)Se2 1

传播动力学模型 1

保护地空缺 1

国家公园 1

改进萤火虫算法；雷达监视网络；部署优化；无人机入侵防御 1

新冠病毒感染 1

流感样病例 1

流行曲线 1

深度学习 1

激光烧蚀短程热效应 1

环境因素 1

生态廊道 1

由P1引起的功率损耗 1

电池到模块的效率差距 1

界面态 1

病毒性感染 1

展开 ︾

检索范围：

排序： 展示方式：

Global influenza surveillancewith Laplacianmultidimensional scaling

Xi-chuan ZHOU,Fang TANG,Qin LI,Sheng-dong HU,Guo-jun LI,Yun-jian JIA,Xin-ke LI,Yu-jie FENG

《信息与电子工程前沿（英文）》 2016年 第17卷 第5期   页码 413-421 doi: 10.1631/FITEE.1500356

摘要： The Global Influenza Surveillance Network is crucial for monitoring epidemic risk in participating countries. However, at present, the network has notable gaps in the developing world, principally in Africa and Asia where laboratory capabilities are limited. Moreover, for the last few years, various influenza viruses have been continuously emerging in the resource-limited countries, making these surveillance gaps a more imminent challenge. We present a spatial-transmission model to estimate epidemic risks in the countries where only partial or even no surveillance data are available. Motivated by the observation that countries in the same influenza transmission zone divided by the World Health Organization had similar transmission patterns, we propose to estimate the influenza epidemic risk of an unmonitored country by incorporating the surveillance data reported by countries of the same transmission zone. Experiments show that the risk estimates are highly correlated with the actual influenza morbidity trends for African and Asian countries. The proposed method may provide the much-needed capability to detect, assess, and notify potential influenza epidemics to the developing world.

关键词： Surveillance gap     Influenza     Spatial-transmission model    

HTML PDF 收藏

Transforming bacterial disease surveillance and investigation using whole-genome sequence to probe the

null

《医学前沿（英文）》 2018年 第12卷 第1期   页码 23-33 doi: 10.1007/s11684-017-0607-7

摘要：

Two decades have passed since the first bacterial whole-genome sequencing, which provides new opportunity for microbial genome. Consequently, considerable genetic diversity encoded by bacterial genomes and among the strains in the same species has been revealed. In recent years, genome sequencing techniques and bioinformatics have developed rapidly, which has resulted in transformation and expedited the application of strategy and methodology for bacterial genome comparison used in dissection of infectious disease epidemics. Bacterial whole-genome sequencing and bioinformatic computing allow genotyping to satisfy the requirements of epidemiological study in disease control. In this review, we outline the significance and summarize the roles of bacterial genome sequencing in the context of bacterial disease control and prevention. We discuss the applications of bacterial genome sequencing in outbreak detection, source tracing, transmission mode discovery, and new epidemic clone identification. Wide applications of genome sequencing and data sharing in infectious disease surveillance networks will considerably promote outbreak detection and early warning to prevent the dissemination of bacterial diseases.

关键词： genome sequencing     genomic epidemiology     bacteria     surveillance     infectious diseases    

HTML PDF 收藏

Fluorene-based narrow-band-gap copolymers for red light-emitting diodes and bulk heterojunction photovoltaic

SUN Mingliang, WANG Li, XIA Yangjun, DU Bin, LIU Ransheng, CAO Yong

《化学科学与工程前沿（英文）》 2008年 第2卷 第3期   页码 257-264 doi: 10.1007/s11705-008-0052-x

摘要： A series of narrow band-gap conjugated copolymers (PFO-DDQ) derived from 9,9-dioctylfluorene (DOF) and 2,3-dimethyl-5,8-dithien-2-yl-quinoxalines (DDQ) is prepared by the palladium-catalyzed Suzuki coupling reaction with the molar feed ratio of DDQ at around 1%, 5%, 15%, 30% and 50%, respectively. The obtained polymers are readily soluble in common organic solvents. The solutions and the thin solid films of the copolymers absorb light from 300–590 nm with two absorbance peaks at around 380 and 490 nm. The intensity of 490 nm peak increases with the increasing DDQ content in the polymers. Efficient energy transfer due to exciton trapping on narrow-band-gap DDQ sites has been observed. The PL emission consists exclusively of DDQ unit emission at around 591–643 nm depending on the DDQ content in solid film. The EL emission peaks are red-shifted from 580 nm for PFO-DDQ1 to 635 nm for PFO-DDQ50. The highest external quantum efficiency achieved with the device configuration ITO/PEDOT/PVK/PFO-DDQ15/Ba/Al is 1.33% with a luminous efficiency 1.54 cd/A. Bulk heterojunction photovoltaic cells fabricated from composite films of PFO-DDQ30 copolymer and [6,6]-phenyl C butyric acid methyl ester (PCBM) as electron donor and electron acceptor, respectively in device configuration: ITO/PEDOT:PSS/PFO-DDQ30:PCBM/PFPNBr/Al shows power conversion efficiencies of 1.18% with open-circuit voltage () of 0.90 V and short-circuit current density () of 2.66 mA/cm under an AM1.5 solar simulator (100 mW/cm). The photocurrent response wavelengths of the PVCs based on PFO-DDQ30/PCBM blends covers 300–700 nm. This indicates that these kinds of low band-gap polymers are promising candidates for polymeric solar cells and red light-emitting diodes.

关键词： simulator     Efficient     band-gap     PFO-DDQ50     intensity    

HTML PDF 收藏

Trends of foodborne diseases in China: lessons from laboratory-based surveillance since 2011

null

《医学前沿（英文）》 2018年 第12卷 第1期   页码 48-57 doi: 10.1007/s11684-017-0608-6

摘要：

Foodborne disease is one of the most important public health issues worldwide. China faces various and unprecedented challenges in all aspects of the food chain. Data from laboratory-based foodborne disease surveillance systems from 2013 to 2016, as well as different regions and ages, can be found along with differences in the patterns of pathogens detected with diverse characteristics. has been the leading cause of infectious diarrhea in China, especially among adults in coastal regions. has been a serious and widely distributed pathogen responsible for substantial socioeconomic burden. was mostly identified in Northwest China and the inland province (Henan) with less-developed regions among children under 5 years. Data from foodborne disease outbreak reporting system from 2011 to 2016 showed that poisonous animals and plant factors responsible for most deaths were poisonous mushrooms (54.7%) in remote districts in southwest regions. The biological hazard that caused most cases reported (42.3%) was attributed to the leading cause of foodborne outbreaks. In this review, we summarize the recent monitoring approach to foodborne diseases in China and compare the results with those in developed countries.

关键词： foodborne diseases     surveillance     TraNet     China    

HTML PDF 收藏

Air bearing center cross gap of neutron stress spectrometer sample table support system

Yang LI,Yunxin WU,Hai GONG,Xiaolei FENG

《机械工程前沿（英文）》 2016年 第11卷 第4期   页码 403-411 doi: 10.1007/s11465-016-0405-y

摘要：

A support system is the main load-bearing component of sample table for neutron stress spectrometer, and air bearing is an important element of a support system. The neutron stress spectrometer sample table was introduced, and the scheme for air bearing combination was selected. To study the performance of air bearing center cross gap, finite element models (FEMs) were established based on air motion and Reynolds equations, effects of air supply pressure, and gap parameters on the overturning moment and bearing capacity of air bearing center cross gap were analyzed. Results indicate that the width, depth, and height differences of the marble floor gap played important roles in the performance of the air bearing. When gap width is lesser than 1 mm and gap depth is lower than 0.4 mm, bearing capacity and overturning moment would vary rapidly with the variation of the width and depth. A gap height difference results in the bearing capacity dropping rapidly. The FEM results agree well with experimental results. Further, findings of the study could guide the design of the support system and marble floor.

关键词： neutron stress spectrometer     sample table     support system     air bearing     center cross gap     simulation     experiment    

HTML PDF 收藏

PulseNet China, a model for future laboratory-based bacterial infectious disease surveillance in China

null

《医学前沿（英文）》 2012年 第6卷 第4期   页码 366-375 doi: 10.1007/s11684-012-0214-6

摘要：

Surveillance is critical for the prevention and control of infectious disease. China’s real-time web-based infectious disease reporting system is a distinguished achievement. However, many aspects of the current China Infectious Disease Surveillance System do not yet meet the demand for timely outbreak detection and identification of emerging infectious disease. PulseNet, the national molecular typing network for foodborne disease surveillance was first established by the Centers for Disease Control and Prevention of the United States in 1995 and has proven valuable in the early detection of outbreaks and tracing the pathogen source. Since 2001, the China CDC laboratory for bacterial pathogen analysis has been a member of the PulseNet International family; and has been adapting the idea and methodology of PulseNet to develop a model for a future national laboratory-based surveillance system for all bacterial infectious disease. We summarized the development progress for the PulseNet China system and discussed it as a model for the future of China’s national laboratory-based surveillance system.

关键词： infectious disease     laboratory-based infectious disease surveillance     pulse field gel electrophoresis     multilocus sequencing typing     PulseNet China    

HTML PDF 收藏

Bridging the gap: Neuro-Symbolic Computing for advanced AI applications in construction

《工程管理前沿（英文）》   页码 727-735 doi: 10.1007/s42524-023-0266-0

摘要： Deep Learning (DL) has revolutionized the field of Artificial Intelligence (AI) in various domains such as computer vision (CV) and natural language processing. However, DL models have limitations including the need for large labeled datasets, lack of interpretability and explainability, potential bias and fairness issues, and limitations in common sense reasoning and contextual understanding. On the other side, DL has shown significant potential in construction for safety and quality inspection tasks using CV models. However, current CV approaches may lack spatial context and measurement capabilities, and struggle with complex safety and quality requirements. The integration of Neuro-Symbolic Computing (NSC), an emerging field that combines DL and symbolic reasoning, has been proposed as a potential solution to address these limitations. NSC has the potential to enable more robust, interpretable, and accurate AI systems in construction by harnessing the strengths of DL and symbolic reasoning. The combination of symbolism and connectionism in NSC can lead to more efficient data usage, improved generalization ability, and enhanced interpretability. Further research and experimentation are needed to effectively integrate NSC with large models and advance CV technologies for precise reporting of safety and quality inspection results in construction.

关键词： advanced AI in construction     safety and quality inspection     Neuro-Symbolic Computing     Deep Learning     computer vision    

HTML PDF 收藏

Wide gap active brazing of ceramic-to-metal-joints for high temperature applications

K. Bobzin,L. Zhao,N. Kopp,S. Samadian Anavar

《机械工程前沿（英文）》 2014年 第9卷 第1期   页码 71-74 doi: 10.1007/s11465-014-0291-0

摘要：

Applications like solid oxide fuel cells and sensors increasingly demand the possibility to braze ceramics to metals with a good resistance to high temperatures and oxidative atmospheres. Commonly used silver based active filler metals cannot fulfill these requirements, if application temperatures higher than 600°C occur. Au and Pd based active fillers are too expensive for many fields of use. As one possible solution nickel based active fillers were developed. Due to the high brazing temperatures and the low ductility of nickel based filler metals, the modification of standard nickel based filler metals were necessary to meet the requirements of above mentioned applications. To reduce thermally induced stresses wide brazing gaps and the addition of Al2O3 and WC particles to the filler metal were applied. In this study, the microstructure of the brazed joints and the thermo-chemical reactions between filler metal, active elements and WC particles were analyzed to understand the mechanism of the so called wide gap active brazing process. With regard to the behavior in typical application oxidation and thermal cycle tests were conducted as well as tensile tests.

关键词： wide gap     active brazing     nickel filler metals     high temperature application     WC     Al2O3    

HTML PDF 收藏

Organophosphate esters in sediment from Taihu Lake, China: Bridging the gap between riverine sources

《环境科学与工程前沿（英文）》 2022年 第16卷 第3期 doi: 10.1007/s11783-021-1464-9

摘要：

• Eleven OPEs were detected in river sediment and lake sediment in Taihu Lake.

关键词： Organophosphate esters     Partition     Vertical distribution     Composition profile     Positive matrix factorization    

HTML PDF 收藏

Investigating the role of exiting vehicles and turn indicator usage in gap acceptance at single-lane

Nathan P. BELZ

《结构与土木工程前沿（英文）》 2017年 第11卷 第1期   页码 8-16 doi: 10.1007/s11709-016-0365-7

摘要： Roundabouts are becoming a preferred form of intersection control type due to their safety and capacity benefits. Yield control at roundabout entries inherently reduces fuel consumption and emissions when compared to other conventional intersection types. However, these benefits can be limited by poor driver behavior and judgment when entering the roundabout. This research addresses the nature of gap distributions and use of turn indicators by exiting vehicles at three single-lane roundabouts in Vermont, New York, and Alaska. Presented here is a comparison of vehicle headways measured at two different locations in each roundabout. Rejected headways are analyzed in the context of priority abstaining events when entering drivers yield to vehicles exiting on the same leg of the roundabout suggesting that “true” critical gaps are being overestimated. Results indicate that exiting vehicles, particularly those that do not use their turn indicators when departing from the major-stream of traffic have an influence on the entry decision of drivers on the same approach. This behavior is of particular concern for intersection efficiency (i.e., delay) and sustainability (i.e., excess fuel consumption and emissions). Results prompt the consideration of more consistent guidance on and enforcement of turn indicator use during roundabout negotiations.

关键词： roundabouts     exiting vehicles     turn indicator use     headways    

HTML PDF 收藏

Bridging the gap between laboratory and field moduli of asphalt layer for pavement design and assessment

Huailei CHENG; Liping LIU; Lijun SUN

《结构与土木工程前沿（英文）》 2022年 第16卷 第3期   页码 267-280 doi: 10.1007/s11709-022-0811-7

摘要： Asphalt pavement is a key component of highway infrastructures in China and worldwide. In asphalt pavement design and condition assessment, the modulus of the asphalt mixture layer is a crucial parameter. However, this parameter varies between the laboratory and field loading modes (i.e., loading frequency, compressive or tensile loading pattern), due to the viscoelastic property and composite structure of the asphalt mixture. The present study proposes a comprehensive frequency-based approach to correlate the asphalt layer moduli obtained under two field and three laboratory loading modes. The field modes are vehicular and falling weight deflectometer (FWD) loading modes, and the laboratory ones are uniaxial compressive (UC), indirect tensile (IDT), and four-point bending (4PB) loading modes. The loading frequency is used as an intermediary parameter for correlating the asphalt layer moduli under different loading modes. The observations made at two field large-scale experimental pavements facilitate the correlation analysis. It is found that the moduli obtained via laboratory 4PB tests are pretty close to those of vehicular loading schemes, in contrast to those derived in UC, IDT, and FWD modes, which need to be adjusted. The corresponding adjustment factors are experimentally assessed. The applications of those adjustment factors are expected to ensure that the moduli measured under different loading modes are appropriately used in asphalt mixture pavement design and assessment.

关键词： asphalt mixture layer     stiffness modulus     loading mode     UC/4PB/IDT     FWD     frequency    

HTML PDF 收藏

An extended cell-based smoothed discrete shear gap method (XCS-FEM-DSG3) for free vibration analysis

M. H. NGUYEN-THOI,L. Le-ANH,V. Ho-HUU,H. Dang-TRUNG,T. NGUYEN-THOI

《结构与土木工程前沿（英文）》 2015年 第9卷 第4期   页码 341-358 doi: 10.1007/s11709-015-0302-1

摘要： A cell-based smoothed discrete shear gap method (CS-FEM-DSG3) was recently proposed and proven to be robust for free vibration analyses of Reissner-Mindlin shell. The method improves significantly the accuracy of the solution due to softening effect of the cell-based strain smoothing technique. In addition, due to using only three-node triangular elements generated automatically, the CS-FEM-DSG3 can be applied flexibly for arbitrary complicated geometric domains. However so far, the CS-FEM-DSG3 has been only developed for analyzing intact structures without possessing internal cracks. The paper hence tries to extend the CS-FEM-DSG3 for free vibration analysis of cracked Reissner-Mindlin shells by integrating the original CS-FEM-DSG3 with discontinuous and crack−tip singular enrichment functions of the extended finite element method (XFEM) to give a so-called extended cell-based smoothed discrete shear gap method (XCS-FEM-DSG3). The accuracy and reliability of the novel XCS-FEM-DSG3 for free vibration analysis of cracked Reissner-Mindlin shells are investigated through solving three numerical examples and comparing with commercial software ANSYS.

关键词： cracked Reissner-Mindlin shell     free vibration analysis     cell-based smoothed discrete shear gap method (CS-FEM-DSG3)     extended cell-based smoothed discrete shear gap method (XCS-FEM-DSG3)     smoothed finite element methods (SFEM)    

HTML PDF 收藏

Review of hand, foot and mouth disease

Lan-Juan LI MD,

《医学前沿（英文）》 2010年 第4卷 第2期   页码 139-146 doi: 10.1007/s11684-010-0033-6

摘要： Hand, foot and mouth disease (HFMD) is an acute viral illness that primarily affects infants and young children, and often occurs in clusters or outbreaks. The major causative agents of HFMD are coxsackievirus A16 (CVA16), human enterovirus 71 (HEV71) and coxsackievirus A10 (CVA10), of the genus in the family Picornaviridae. HFMD caused by EV71 is associated with severe neurological complications and death. Since the late 1990s, several major epidemics of EV71 HFMD have swept through the Asia-Pacific region, associated with a rapid fulminant course, severe neurological complications, and a large number of fatalities. Until now, little has been known about the genetics and transmission trends of the fast-mutation virus, and there is no effective and specific antiviral therapy or vaccine for HFMD. It is time to step up efforts to understand the molecular epidemics and pathogenesis so that we can develop effective management strategies and surveillance programs.

关键词： hand     foot and mouth disease     epidemiology     pathogenesis     management     surveillance    

HTML PDF 收藏

CRISPR基因编辑作物有望走上消费者的餐桌

Sarah C.P. Williams

《工程（英文）》 2023年 第20卷 第1期   页码 6-8 doi: 10.1016/j.eng.2022.11.002

HTML PDF 收藏

基于高κ/GaAs界面态起源的材料设计 Article

Weichao Wang,Cheng Gong,Ka Xiong,Santosh K.C.,Robert M. Wallace,Kyeongjae Cho

《工程（英文）》 2015年 第1卷 第3期   页码 372-377 doi: 10.15302/J-ENG-2015052

摘要：

为了满足微电子器件不断扩展到更小尺寸的需求，SiO2栅极介电层被高介电常量材料Hf(Zr)O2所替代，以尽可能减少流过介电薄膜的漏电流。然而，与高介电常量 (高κ) 电介质连接时，传统Si通道中的电子迁移率由于库仑散射、表面粗糙度散射、远程声子散射和介电电荷捕获而有所下降。III-V和Ge是两个有希望的候选材料，其迁移率均优于Si。尽管如此，与Si基界面相比，Hf(Zr)O2/III-V(Ge) 的界面结合更为复杂。成功制造高质量器件关键在于优化器件界面设计时对Hf(Zr)O2/III-V(Ge) 界面结合结构的理解与设计。因此，从原子尺度准确了解界面结合与界面态形成的机制变得尤为重要。在本文中，笔者利用第一性原理计算方法，对HfO2与GaAs之间的界面性质进行了研究。结果表明，隙间态主要由As—As二聚物键合、Ga部分氧化( 在3+和1+之间) 和Ga—悬挂键贡献。这些研究成果能为最优化界面钝化提供重要的指导意见。

关键词： 高迁移率器件     高&kappa     /III-V界面     界面态     第一性原理计算方法    

HTML PDF 收藏

标题 作者 时间 类型 操作

Global influenza surveillancewith Laplacianmultidimensional scaling

Xi-chuan ZHOU,Fang TANG,Qin LI,Sheng-dong HU,Guo-jun LI,Yun-jian JIA,Xin-ke LI,Yu-jie FENG

期刊论文

Transforming bacterial disease surveillance and investigation using whole-genome sequence to probe the

null

期刊论文

Fluorene-based narrow-band-gap copolymers for red light-emitting diodes and bulk heterojunction photovoltaic

SUN Mingliang, WANG Li, XIA Yangjun, DU Bin, LIU Ransheng, CAO Yong

期刊论文

Trends of foodborne diseases in China: lessons from laboratory-based surveillance since 2011

null

期刊论文

Air bearing center cross gap of neutron stress spectrometer sample table support system

Yang LI,Yunxin WU,Hai GONG,Xiaolei FENG

期刊论文

PulseNet China, a model for future laboratory-based bacterial infectious disease surveillance in China

null

期刊论文

Bridging the gap: Neuro-Symbolic Computing for advanced AI applications in construction

期刊论文

Wide gap active brazing of ceramic-to-metal-joints for high temperature applications

K. Bobzin,L. Zhao,N. Kopp,S. Samadian Anavar

期刊论文

Organophosphate esters in sediment from Taihu Lake, China: Bridging the gap between riverine sources

期刊论文

Investigating the role of exiting vehicles and turn indicator usage in gap acceptance at single-lane

Nathan P. BELZ

期刊论文

Bridging the gap between laboratory and field moduli of asphalt layer for pavement design and assessment

Huailei CHENG; Liping LIU; Lijun SUN

期刊论文

An extended cell-based smoothed discrete shear gap method (XCS-FEM-DSG3) for free vibration analysis

M. H. NGUYEN-THOI,L. Le-ANH,V. Ho-HUU,H. Dang-TRUNG,T. NGUYEN-THOI

期刊论文

Review of hand, foot and mouth disease

Lan-Juan LI MD,

期刊论文

CRISPR基因编辑作物有望走上消费者的餐桌

Sarah C.P. Williams

期刊论文

基于高κ/GaAs界面态起源的材料设计

Weichao Wang,Cheng Gong,Ka Xiong,Santosh K.C.,Robert M. Wallace,Kyeongjae Cho

期刊论文