检索结果-南通市图书馆

Verification of Bacteroidales 16S rRNA markers as a complementary tool for detecting swine fecal pollution in the Yangtze Delta

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2020年第4期32卷 59-66页

作者： Lihua fan Xiaofeng Zhang Ruoxue Zeng Suhua Wang Chenchen Jin Yongqiang He Jiangbing Shuai Department of Food Science and Nutrition Zhejiang Key Laboratory for Agro-Food ProcessingZhejiang UniversityHangzhou 310016China Zhejiang Academy of Science and Technology for Inspection and Quarantine Hangzhou 310058China

To correctly assess and properly manage the public health risks associated with exposure to contaminated water,it is necessary to identify the source of fecal pollution in a *** this study,we evaluated the efficacy of our two previously developed real time-quantitative PCR(qPCR)assays for the detection of swine-associated Bacteroidales genetic markers(gene 1-38,gene 3-53)in the Yangtze Delta watershed of southeastern *** results indicated that the gene 1-38 and 3-53 markers exhibited high accuracy(92.5%,91.7%conditional probability,respectively)in detecting Bacteroidales *** water *** to binary logistic regression(BLR),these two swine-associated markers were well correlated(P<0.05)with fecal indicators(Escherichia coli and Enterococci spp.)and zoonotic pathogens(*** O157:H7,Salmonella *** Campylobacter spp.)in water *** contrast,concentrations of conventional fecal indicator bacteria(FIB)were not correlated with zoonotic pathogens,suggesting that they are noneffective at detecting fecal pollution ***,the results obtained in this study demonstrated that a swinetargeted qPCR assay based on two Bacteroidales genes markers(gene 1-38,gene 3-53)could be a useful tool in determining the swine-associated impacts of fecal contamination in a watershed.

关键词： Bacteroidales genes markers Water pollution Real-time quantitative PCR Fecal indicators Zoonotic pathogens

Electrospun fiber membrane with asymmetric NO release for the differential regulation of cell growth

在线全文

学校读者我要写书评

暂无评论

Bio-Design and Manufacturing 2021年第3期4卷 469-478页

作者： Shengyu Chen fan Jia Luying Zhao Fuyu Qiu Shaohua Jiang Jian Ji Guosheng Fu Department of Cardiology Sir Run Run Shaw HospitalZhejiang University School of MedicineHangzhou 310016China MOE Key Laboratory of Macromolecule Synthesis and Functionalization Department of Polymer Science and EngineeringZhejiang UniversityHangzhou 310027China Co-Innovation Center of Efficient Processing and Utilization of Forest Resources College of Materials Science and EngineeringNanjing Forestry UniversityNanjing 210037China Key Laboratory of Cardiovascular Intervention and Regenerative Medicine of Zhejiang Province Hangzhou 310016China

The high incidence of cardiovascular disease has led to significant demand for synthetic vascular grafts in clinical ***-proliferation drugs are usually loaded into devices to achieve desirable anti-thrombosis effects after ***,the non-selectiveness of these conventional drugs can lead to the failure of blood vessel reconstruction,leading to potential complications in the long *** address this issue,an asymmetric membrane was constructed through electro-spinning *** bilayer membrane loaded and effectively released nitric oxide(NO),as hoped,from only one *** to the short diffusion distance of NO,it exerted negligible effects on the other side of the membrane,thus allowing selective regulation of different cells on both *** released NO boosted the growth of endothelial cells(ECs)over smooth muscle cells(SMCs)-while on the side where NO was absent,SMCs grew into *** overall structure resembled a native blood vessel,with confluent ECs as the inner layer and layers of SMCs to support *** addition,the membrane preserved the normal function of ECs,and at the same time did not exacerbate inflammatory *** preparing this material type that regulates cell behavior differentially,we describe a new method for its application in the cardiovascular field such as for artificial blood vessels.

关键词： Nitric oxide Asymmetric drug release Electrospun fiber membrane Artificial blood vessel

A Secure IoT Firmware Update Scheme Against SCPA and DoS Attacks

在线全文

学校读者我要写书评

暂无评论

Journal of Computer Science & Technology 2021年第2期36卷 419-433页

作者： Yan-Hong fan Mei-Qin Wang Yan-Bin Li Kai Hu Mu-Zhou Li School of Cyber Science and Technology Shandong UniversityQingdao 266237China Key Laboratory of Cryptologic Technology and Information Security(Shandong University) Ministry of Education Qingdao 266237China

In the IEEE S&P 2017,Ronen et *** side-channel power analysis(SCPA)and approximately 5000 power traces to recover the global AES-CCM key that Philip Hue lamps use to decrypt and authenticate new *** on the recovered key,the attacker could create a malicious firmware update and load it to Philip Hue lamps to cause Internet of Things(IoT)security *** by the work of Ronen et al.,we propose an AES-CCM-based firmware update scheme against SCPA and denial of service(DoS)*** proposed scheme applied in IoT terminal devices includes two aspects of design(i.e.,bootloader and application layer).Firstly,in the bootloader,the number of updates per unit time is limited to prevent the attacker from acquiring a sufficient number of useful traces in a short time,which can effectively counter an SCPA ***,in the application layer,using the proposed handshake protocol,the IoT device can access the IoT server to regain update permission,which can defend against DoS ***,on the STM32F405+M25P40 hardware platform,we implement Philips'and the proposed modified *** results show that compared with the firmware update scheme of Philips Hue smart lamps,the proposed scheme additionally requires only 2.35 KB of Flash memory and a maximum of 0.32 s update time to effectively enhance the security of the AES-CCM-based firmware update process.

关键词： Internet of Things firmware update authenticated encryption side-channel power analysis denial of service

Removal of arsenic by pilot-scale vertical flow constructed wetland

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

Frontiers of Environmental Science & Engineering 2021年第4期15卷 351-363页

作者： Yaocheng fan Tiancui Li Deshou Cun Haibing Tang Yanran Dai Feihua Wang Wei Liang State Key Laboratory of Freshwater Ecology and Biotechnology Institute of HydrobiologyChinese Academy of SciencesWuhan430072China University of Chinese Academy of Sciences Beijing100049China

Four pilot-scale Vertical Flow Constructed Wetlands(VFCWs)filled with gravel and planted with Phragmites australis were operated for seven months in the field to study the efficiency of arsenic removal in contaminated *** average arsenic removal efficiency by the VFCWs was 52.0%±20.2%,52.9%±21.3%,and 40.3%±19.4%at the theoretical concentrations of 50µg/L(CW50),100µg/L(CW100),and 500µg/L(CW500)arsenic in the wastewater,*** results also showed no significant differences in the removal efficiency for conventional contaminants(nitrogen,phosphorus,or chemical oxygen demand)between wastewater treatments that did or did not contain arsenic(P>0.05),except for phosphorus in *** highest average monthly removal rate of arsenic occurred in August(55.9%–74.5%)and the lowest in November(7.8%–15.5%).The arsenic removal efficiency of each VFCW was positively correlated with temperature(P<0.05).Arsenic accumulated in both substrates and plants,with greater accumulation associated with increased arsenic concentrations in the *** maximum accumulated arsenic concentrations in the substrates and plants at the end of the experiment were 4.47 mg/kg and 281.9 mg/kg,respectively,both present in *** translocation factor(TF)of arsenic in the reeds was less than 1,with most of the arsenic accumulating in the *** arsenic mass balance indicated that substrate accumulation contributed most to arsenic removal(19.9%–30.4%),with lower levels in plants(3.8%–9.5%).In summary,VFCWs are effective for the treatment of arsenic-containing wastewater.

关键词： Constructed wetland Arsenic Removal efficiency Mass balance

The methodology flaws in Hinman's acupuncture clinical trial, Part Ⅱ: Zelen design and effectiveness dilutions

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Medicine 2015年第3期13卷 136-139页

作者： Arthur Yin fan McLean Center for Complementary and Alternative Medicine PLC.

In the October 2014 publication of JAMA, Dr. Hinman and colleagues published the study “Acupuncture for Chronic Knee Pain： A Randomized Clinical Trial,” which concluded that in patients older than 50 years with moderate or severe chronic knee pain, neither laser nor needle acupuncture conferred benefit over sham for pain or function. Our findings do not support acupuncture for these patients.

关键词： acupuncture chronic knee pain Hinman Zelen design clinical trial statistics flaws

Molecular Dynamics Simulations of Displacement Cascade in Ni-Based Concentrated Solid Solution Alloys

在线全文

学校读者我要写书评

暂无评论

Acta Mechanica Solida Sinica 2024年第1期37卷 82-89页

作者： Chaoquan Zhao Rongxuan Xie Chuanlong Xu Xiaobao Tian Qingyuan Wang Wentao Jiang Haidong fan Department of Mechanics Sichuan UniversityChengdu 610065China

Single-phase concentrated solid solution alloys(SP-CSAs),including high-entropy alloys,have received extensive attention due to their excellent irradiation *** this work,displacement cascade simulations are conducted using the molecular dynamics method to study the evolution of defects in Ni-based *** with pure Ni,the NiCr,NiCo,and NiCu alloys exhibit a larger number of Frankel pairs(FPs)in the thermal peak stage,but a smaller number of surviving ***,the NiFe alloy displays the opposite *** explain these different observations for NiFe and other alloys,the formation energy and migration energy of interstitials/vacancies are *** the NiFe alloy,both the formation energy and migration energy barrier are *** the other hand,in NiCr and other alloys,the formation energy of interstitials/vacancies is lower,as is the migration energy barrier of *** energy analysis agrees well with previous *** present work provides new insights into the mechanism behind the irradiation resistance of binary Ni-based SP-CSAs.

关键词： Molecular dynamics simulation Displacement cascade Point defect Ni-based concentrated solid solution alloys

Relationship of species diversity between overstory trees and understory herbs along the environmental gradients in the Tianshan Wild Fruit Forests, Northwest China

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

Journal of Arid Land 2020年第4期12卷 618-629页

作者： CHENG Junhui SHI Xiaojun fan Pengrui ZHOU Xiaobing SHENG Jiandong ZHANG Yuanming Xinjiang Key Laboratory of Soil and Plant Ecological Processes College of Grassland and Environmental SciencesXinjiang Agricultural UniversityUrumqi 830052China State Key Laboratory of Desert and Oasis Ecology Xinjiang Institute of Ecology and GeographyChinese Academy of SciencesUrumqi 830011China

In forest ecosystems, interactions between overstory trees and understory herbs play an important role in driving plant species diversity. However, reported links between overstory tree and understory herb species diversity have been inconsistent, due to variations in forest types and environmental conditions. Here, we measured species richness(SR) and diversity(Shannon-Wiener(H') and Simpson's(D) indices) of overstory trees and understory herbs in the protected Tianshan Wild Fruit Forest(TWFF), Northwest China, to explore their relationships along the latitudinal, longitudinal, elevational, and climatic(current climate and paleoclimate) gradients in 2018. We found that SR, and H' and D diversity indices of overstory trees and understory herbs exhibited a unimodal pattern with increasing latitude and elevation(P<0.05) and negative associations with longitude(P<0.01). Along the climatic gradients, there were U-shaped patterns in SR, and H' and D diversity indices between trees and herbs(P<0.05). SR, and H' and D diversity indices for overstory tree species were positively associated with those for understory herbs(P<0.01). These findings indicate that overstory trees and understory herbs should be protected concurrently in the TWFF to increase effectiveness of species diversity conservation programs.

关键词： diversity indices overstory trees understory herbs paleoclimate current climate elevation

Towards characterizing bug fixes through dependency-level changes in Apache Java open source projects

在线全文

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2022年第7期65卷 102-120页

作者： Di CUI Lingling fan Sen CHEN Yuanfang CAI Qinghua ZHENG Yang LIU Ting LIU School of Computer Science and Technology Xi'an Jiaotong University College of Cyber Science Nankai University College of Intelligence and Computing Tianjin University Department of Computer Science Drexel University School of Computer Science and Engineering Nanyang Technological University School of Cyber Science and Engineering Xi'an Jiaotong University

The complexity and diversity of bug fixes require developers to understand bug fixes from multiple perspectives in addition to fine-grained code changes. The dependencies among files in a software system are an important dimension to inform software quality. Recent studies have revealed that most bug-prone files are always architecturally connected with dependencies, and as one of the best practices in the industry,changes in dependencies should be avoided or carefully made during bug fixing. Hence, in this paper, we take the first attempt to understand bug fixes from the dependencies perspective, which can complement existing code change perspectives. Based on this new perspective, we conducted a systematic and comprehensive study on bug fixes collected from 157 Apache open source projects, involving 140456 bug reports and182621 bug fixes in total. Our study results show that a relatively high proportion of bug fixes(30%) introduce dependency-level changes when fixing the corresponding 33% bugs. The bugs, whose fixes introduce dependency-level changes, have a strong correlation with high priority, large fixing churn, long fixing time,frequent bug reopening, and bug inducing. More importantly, patched files with dependency-level changes in their fixes, consume much more maintenance costs compared with those without these changes. We further summarized three representative patch patterns to explain the reasons for the increasing costs. Our study unveils useful findings based on qualitative and quantitative analysis and also provides new insights that might benefit existing bug prediction techniques. We release a large set of benchmarks and also implement a prototype tool to automatically detect dependency-level changes from bug fixes, which can warn developers and remind them to design a better fix.

关键词： empirical software engineering Empirical Software Engineering software maintenance Software Maintenance Software Evolution software evolution Software Architecture software architecture software design Software Design

同方期刊数据库

Photocatalytic Methane Conversion:Insight into the Mechanism of C(sp^(3))-H Bond Activation

在线全文

学校读者我要写书评

暂无评论

CCS Chemistry 2023年第1期5卷 30-54页

作者： Yuheng Jiang Yingying fan Siyang Li Zhiyong Tang Chinese Academy of Science(CAS)Key Laboratory of Nanosystem and Hierarchy Fabrication CAS Center for Excellence in NanoscienceNational Center for Nanoscience and TechnologyBeijing 100190 Center for Advanced Analytical Science School of Chemistry and Chemical EngineeringSchool of Civil EngineeringAnalytical and Testing CenterGuangzhou UniversityGuangzhou 510006 Center for Nanoscale Science and Technology Academy for Advanced Interdisciplinary StudiesPeking UniversityBeijing 100871 University of Chinese Academy of Sciences Beijing 100049

Mild and direct conversion of methane into high value-added products is a desired goal for chemistry,energy,and *** active species generated in the photocatalytic reaction system under mild conditions activate the inert C-H bond in methane and promote methane *** review focuses on the developed mechanisms for C(sp^(3))-H bond activation in photocatalytic methane conversion,including radical and active site *** emphasis is placed on the detailed summary of mechanism,characterization method,and corresponding application in photocatalytic methane *** also discuss the challenges and prospects for future direction on C(sp^(3))-H bond activation mechanism in photocatalytic methane *** review aims to promote the development of photocatalytic methane conversion and provides guidance for the design of high-efficiency photocatalysts.

关键词： photocatalysis methane C-H bonds radical active site