检索结果-南通市图书馆

Preparation and Properties of Ultrathin Flexible Expanded Graphite Film via Adding Natural Rubber

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2019年第8期37卷 806-814页

作者： Yan-Ling Mo yu-Xin Tian yu-hang liu Feng Chen Qiang Fu College of Polymer Science and Engineering Sichuan University State Key Laboratory of Polymer Materials Engineering

Expanded graphite(EG) films exhibit potential use in a wide field including thermal management, conductive applications,and electromagnetic interference(EMI) shielding. However, their poor tensile strength and brittleness are crucial deficiencies for commercial applications. To address these defects, in our work, natural rubber(NR) is employed to improve EG films for better mechanical strength and flexibility. The origin of the strengthening effect of EG films by the addition of natural rubber mainly arises from the formation of a simulate shell structure. Compared to the neat EG films, the addition of merely 2 wt% NR can give rise to superior ductility. Further, the loading of 10 wt% NR realizes a significant mechanical enhancement of the EG/NR films, i.e., 2.4 and 11.4 times increase in tensile strength and elongation at break, respectively. Besides, EG/NR films containing 10 wt% NR can still sustain excellent thermal and electric conductivities of 173 W·m^-1·K^-1 and 75 S·cm^-1, respectively. Furthermore, a very high EMI of 41.4 dB is achieved as the film thickness reaches 50 μm. Thus, the lightweight EG/NR films with comprehensive performance as well as their virtue of green and simple large-scale preparation endow them with the possibility of designing next-generation flexible electronics.

关键词： Expanded graphite Natural rubber Composite films Thermal and electric properties

Rapid construction of the tricyclic cores of the abietane- and icetexane-type diterpenoids

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2011年第7期22卷 774-776页

作者： De Lin Chen Xiao yu liu hang Cheng Feng Peng Wang Department of Chemistry of Medicinal Natural Products West China College of Pharmacy Sichuan University Chengdu 610041 China

A short synthesis of the tricyclic 6-6-6 and 6-7-6 ring systems of the abietane- and icetexane-type diterpenoids from a common intermediate is presented, using alkylation and acid-catalyzed cyclization as key steps.

关键词： Abietanes Icetexanes Alkylation Cyclization

IMPULP:A Hardware Approach for In-Process Memory Protection via User-Level Partitioning

在线全文

学校读者我要写书评

暂无评论

Journal of Computer Science & Technology 2020年第2期35卷 418-432页

作者： Yang-Yang Zhao Ming-yu Chen yu-hang liu Zong-Hao Yang Xiao-Jing Zhu Zong-Hui Hong yun-Ge Guo State Key Laboratory of Computer Architecture Institute of Computing TechnologyChinese Academy of Sciences Beijing 100190China University of Chinese Academy of Sciences Beijing 100049China Peng Cheng Laboratory Shenzhen 518055China

In recent years many security attacks occur when malicious codes abuse in-process memory *** to the increasing complexity,an application program may call third-party code which cannot be controlled by programmers but may contain security *** a result,the users have the risk of suffering information leakage and control flow ***,current solutions like Intel memory protection extensions(MPX)severely degrade performance,while other approaches like Intel memory protection keys(MPK)lack flexibility in dividing security *** this paper,we propose IMPULP,an effective and efficient hardware approach for in-process memory *** rationale of IMPULP is user-level partitioning that user code segments are divided into different security domains according to their instruction addresses,and accessible memory spaces are specified dynamically for each domain via a set of boundary *** instruction related to memory access will be checked according to its security domain and the corresponding boundaries,and illegal in-process memory access of untrusted code segments will be *** can be leveraged to prevent a wide range of in-process memory abuse attacks,such as buffer overflows and memory *** verification,an FPGA prototype based on RISC-V instruction set architecture has been *** present eight tests to verify the effectiveness of IMPULP,including five memory protection function tests,a test to defense typical buffer overflow,a test to defense famous memory leakage attack named Heartbleed,and a test for security *** execute the SPEC CPU2006 benchmark programs to evaluate the efficiency of *** performance overhead of IMPULP is less than 0.2%runtime on average,which is ***,the resource overhead is less than 5.5%for hardware modification of IMPULP.

关键词： in-process isolation memory protection out-of-bounds user-level partitioning

Periprostatic fat thickness measured on MRI correlates with lower urinary tract symptoms,erectile function,and benign prostatic hyperplasia progression

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Asian Journal of Andrology 2021年第1期23卷 80-84页

作者： Bo Zhang Xiang Chen yu-hang liu yu Gan Pei-Hua liu Zhi Chen Wei-Ping Xia Guo-yu Dai Feng Ru Ze-Xiang Jiang Yao He Department of Urology Xiangya HospitalCentral South UniversityChangsha 410008China

This study investigated the correlation between periprostatic fat thickness(PPFT)measured on magnetic resonance imaging and lower urinary tract symptoms,erectile function,and benign prostatic hyperplasia(BPH)progression.A total of 286 treatment-naive men diagnosed with BPH in our department between March 2017 and February 2019 were *** were divided into two groups according to the median value of PPFT:high(PPFT>4.35 mm)PPFT group and low(PPFT<4.35 mm)PPFT *** the initial evaluation,all patients received a combination drug treatment of tamsulosin and finasteride for 12 *** the 286 enrolled patients,244 completed the drug treatment *** with high PPFT had larger prostate volume(PV;P=0.013),higher International Prostate Symptom Score(IPSS;P-0.008),and lower five-item version of the International Index of Erectile Function(IIEF-5)score(P=0.002)than those with low *** high and low PPFT groups showed significant improvements in PV,maximum flow rate,IPSS,and quality of life score and a decrease of IIEF-5 score after the combination drug *** decrease of IIEF-5 score was more obvious in the high PPFT group than that in the low PPFT *** addition,more patients in the high PPFT group underwent prostate surgery than those in the low PPFT ***,Pearson’s correlation coefficient analysis indicated that PPFT was positively correlated with age,PV,and IPSS and negatively correlated with IIEF-5 score;however,body mass index was only negatively correlated with IIEF-5 score.

关键词： benign prostatic hyperplasia clinical progression erectile function lower urinary tract symptoms periprostatic fat thickness

Hybrid magnetic resonance and optoacoustic tomography(MROT) for preclinical neuroimaging

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Light(Science & Applications) 2022年第12期11卷 2961-2971页

作者： Zhenyue Chen Irmak Gezginer Mark-Aurel Augath Wuwei Ren yu-hang liu Ruiqing Ni Xose Luis Dean-Ben Daniel Razansky Institute for Biomedical Engineering and Institute of Pharmacology and Toxicology Faculty of MedicineUniversity of ZurichZurichSwitzerland Institute for Biomedical Engineering Department of Information Technology and Electrical EngineeringETH ZurichZurichSwitzerland Zurich Neuroscience Center(ZNZ) ZurichSwitzerland

Multi-modal imaging is essential for advancing our understanding of brain function and unraveling pathophysiological processes underlying neurological and psychiatric *** resonance(MR)and optoacoustic(OA)imaging have been shown to provide highly complementary contrasts and capabilities for preclinical *** integration between these modalities can thus offer unprecedented capabilities for studying the rodent brain in *** report on a hybrid magnetic resonance and optoacoustic tomography(MROT)system for concurrent noninvasive structural and functional imaging of the mouse *** OA tomography was designed as an insert into a high-field MR scanner by integrating a customized MR-compatible spherical transducer array,an illumination module,and a dedicated radiofrequency coil.A tailored data processing pipeline has been developed to mitigate signal crosstalk and accurately register image volumes acquired with T1-weighted,angiography,and blood oxygenation level-dependent(BOLD)sequences onto the corresponding vascular and oxygenation data recorded with the OA *** demonstrate the concurrent acquisition of dual-mode anatomical and angiographic brain images with the scanner,as well as real-time functional readings of multiple hemodynamic parameters from animals subjected to oxygenation *** approach combines the functional and molecular imaging advantages of OA with the superb soft-tissue contrast of MR,further providing an excellent platform for cross-validation of functional readings by the two modalities.

关键词： scanner resonance illumination

Genome-wide analysis of Panonychus citrimicro RNAs witha focus on potential insecticidal activity of 4 micro RNAs toeggs and nymphs

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Insect Science 2024年第2期31卷 354-370页

作者： Chuan-Zhen Li yu-hang liu Deng Pan Meng-Hao Xia Qiang Zhang yu-Chuang Li Guo-Rui yuan Jin-Jun Wang Wei Dou Key Laboratory of Entomology and Pest Control Engineering College of Plant ProtectionAcademy of Agricultural SciencesSouthwestUniversityChongqingChina Key Laboratory of Agricultural Biosafety and Green Production of Upper Yangtze River(Ministry of Education) Academy of Agricultural SciencesSouthwest UniversityChongqingChina

Panonychus citriMcGregor(Acari:Tetranychidae),a destructive citrus pest,causes considerable annual economic losses due to its short lifespan and rapid ***(miRNA)-induced RNA interference is a promising approachfor pest control because of endogenous regulation of pest growth and *** for miRNAs with potential insecticidal activity ***,genome-wide analysis ofmiRNAs at different developmental stages was conducted,resulting in the identificationof 136 miRNAs,including 73 known and 63 novel miRNAs.A total of 17 isomiRNAsand 12 duplicated miRNAs were ***-1 and miR-252-5p were identified asreference miRNAs *** *** on differential expressionanalysis,treatments with miR-let-7a and miR-315 mimics and the miR-let-7a antagomirsignificantly reduced the egg hatch rate and resulted in abnormal egg ***-expression or downregulation of miR-34-5p and miR-305-5p through feeding significantlydecreased the adult eclosion rate and caused molting *** 4 miRNAs,miR-let-7a,miR-315,miR-34-5p,and miR-305-5p,had important regulatory functions and insectici-dal properties in egg hatching and adult *** general,these data advance our un-derstanding of miRNAs in mite biology,which can assist future studies on insect-specificmiRNA-based green pest control technology.

关键词： growth and development microRNAs Panonychus citri referencemiRNAs regulation small RNA libraries

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

融合均匀变异与高斯变异的蝙蝠优化算法

控制与决策 2017年第10期32卷 1775-1781页

作者：李煜裴宇航刘景森河南大学管理科学与工程研究所河南开封475004 河南大学计算机与信息工程学院河南开封475004 河南大学智能网络系统研究所河南开封475004

为提高蝙蝠算法的寻优精度和收敛速度,提出一种融合均匀变异和高斯变异的蝙蝠优化算法.算法引入变异开关函数,该函数使所有蝙蝠个体在任何时期都有概率发生变异,使种群保持较高的多样性和活跃性.同时在算法整个寻优过程中融入均匀变异... 详细信息

为提高蝙蝠算法的寻优精度和收敛速度,提出一种融合均匀变异和高斯变异的蝙蝠优化算法.算法引入变异开关函数,该函数使所有蝙蝠个体在任何时期都有概率发生变异,使种群保持较高的多样性和活跃性.同时在算法整个寻优过程中融入均匀变异和高斯变异,两种变异机制共同协作使算法首先快速定位到全局最优解区域,随后完成局部精确搜索.仿真结果表明,改进后的算法寻优性能显著提高,具有较快的收敛速度和较高的收敛精度.

关键词：蝙蝠算法均匀变异高斯变异变异开关函数

Sustained Ventricular Tachycardia Secondary to Cardiac Metastasis of Lung Cancer

在线全文

学校读者我要写书评

暂无评论

Chinese Medical Journal 2018年第3期131卷 352-353页

作者： Ying-Ying Li Hua Wang Ya-Dong Cui hang-yu liu Jie-Fu Yang Department of Cardiology Beijing Hospital National Center of Gerontology Beijing 100730 China Department of Radiology Beijing Hospital National Center of Gerontology Beijing 100730 China

Although primary cardiac tumors are rare,cardiac metastasis of malignant tumors is not as infrequent as we might *** pericardium is the most frequently involved site and myocardial involvement is less *** this report,we present the case of a patient with a metastatic tumor on the left ventricular wall secondary to the lung cancer with sustained ventricular tachycardia （VT）.

关键词：

Low-intensity walking as mild medication for pressure control in prehypertensive and hypertensive subjects:how far shall we wander?

在线全文

学校读者我要写书评

暂无评论

Acta Pharmacologica Sinica 2019年第8期40卷 1119-1126页

作者： Qin Lu Sheng-ming Wang Yi-xiao liu Hong Chen Rui Zhang Wen-hui Zhang yuan-yuan Zou Jia-wei Zhou Xin-yi Guo Ying Zhang Teng-Li Huang yu-hang liu Si-qi Zhang Kyosuke Yamanishi Hiromichi Yamanishi Hideaki Higashino Haruki Okamura Department of Pharmacology and Chemical Biology Shanghai Jiao Tong University School of Medicine Hirakata Ryoikuen

Successful prevention and treatment of hypertension depend on the appropriate combination of antihypertensive drug therapy and nondrug lifestyle *** most hypertension guidelines recommend moderate-to high-intensity exercise,we decided to explore a mild yet effective type of exercise to add to hypertension management,especially in populations with complications or *** comparing the short-term cardiovascular effects of low-speed walking versus high-speed walking for 3 kilometers(km)(3 km/h versus 6 km/h)in young,healthy volunteers,we delivered low-speed walking(low-intensity walking,2.5 metabolic equivalents of task,METs)as exercise therapy in 42 prehypertensive and 43 hypertensive *** found that one session of 3 km low-intensity walking exerted a transient pressure-lowering effect as well as a mild negative chronotropic effect on heart rate in both the prehypertensive and hypertensive subjects;these short-term benefits on blood pressure and heart rate were accompanied by a brief increase in urine β-endorphin *** we prescribed regular low-intensity walking with a target exercise dose(exercise volume)of 500-1000 METs-min/week(50-60 min/day and 5-7 times/week)in hypertensive subjects in addition to their daily *** low-intensity walking also showed mild but significant blood pressure-lowering and heart rate-reducing effects in 7 hypertensive subjects within two *** is hypothesized that regular low-intensity exercise of the necessary dose could be taken as a pragmatic and supplementary medication for hypertension management.

关键词： hypertension prehypertension exercise medication low-intensity walking metabolic equivalent of task blood pressure heart rate urine β-endorphin