检索结果-南通市图书馆

Interharmonic Analysis Model of Photovoltaic Grid-connected System with Extended Dynamic Phasors

在线全文

学校读者我要写书评

暂无评论

Journal of Modern Power Systems and Clean Energy 2021年第6期9卷 1540-1547页

作者： Qing Zhong Yangxin Qiu Yuming Zhao Haifeng Li Gang Wang Fushuan Wen School of Electric Power South China University of Technology shenzhen Power Supply bureau Co. Ltd. School of Electrical Engineering Zhejiang University

The interactions between randomly fluctuating power outputs from photovoltaic(PV) at the DC side and background voltage distortions at the AC side could generate interharmonics in the PV grid-connected system(PVGS). There is no universal method that can reveal the transmission mechanism of interharmonics and realize accurate calculation in different scenarios where interharmonics exist in the PVGS. Therefore, extended dynamic phasors(EDPs) and EDP sequence components(EDPSCs) are employed in the interharmonic analysis of the PVGS. First, the dynamic phasors(DPs) and dynamic phasor sequence components(DPSCs) are extended into EDPs and EDPSCs by selecting a suitable fundamental frequency other than the power frequency. Second, an interharmonic analysis model of the PVGS is formulated as a set of state space equations. Third, with the decoupling characteristics of EDPSCs,generation principles and interactions among the interharmonics in the PVGS are presented by the sequence components,and its correctness is verified by simulation and *** presented model can be used to accurately calculate the interharmonics generated in the PVGS both at the AC and DC sides. Because of the decoupling among the EDPSCs, the set of state space equations can effectively describe the principle.

关键词： Dynamic phasor sequence component(DPSC) harmonic interharmonic photovoltaic grid-connected system(PVGS) power quality

Nurses’ knowledge, perceptions, and behaviors regarding antineoplastic drugs:the mediating role of protective knowledge

在线全文

学校读者我要写书评

暂无评论

Frontiers of Nursing 2022年第2期9卷 155-163页

作者： Ning Liu Hong Lu Xiao-Qing Yi Yang Yang Xiao-Hong Huang Nursing Faculty Zhuhai Campus of Zunyi Medical UniversityZhuhaiGuangdong 509041China Department of Nursing Chinese Academy of Medical Sciences Cancer Hospital Shenzhen HospitalShenzhenGuangdong 518116China Department of Nursing Baoan District People’s Hospital of ShenzhenShenzhenGuangdong 518101China Department of Nursing Longgang District Central Hospital of ShenzhenShenzhenGuangdong 518116China

Objective:To explore the relationships between Chinese nurses’knowledge,perceptions,and attitudes and their behavior and actual implementation of safety measures when handling antineoplastic drugs(ADs)in their daily ***:This was a multisite study conducted in 8 public hospitals in China.A self-administered questionnaire was sent to par ticipants querying the degree of contact with *** hypothesized relations were explored using structural equation modelling via the bootstrap *** analysis was applied to explore the mediating role of protective knowledge regarding AD exposure on the associations among protective training,using warning labels,and using protective ***:A total of 305 nurses were *** average age of all par ticipants was 30.2(standard deviation[SD]:6.2)*** who had received protective training for AD exposure were more likely to use labels for ADs after age,body mass index(BMI),length of service,marital status,education,and department were controlled as *** bias-corrected bootstrap of 95%confidence interval(CI)indicated that protective knowledge significantly mediated(23.4%)the association between protective training and using labels(indirect effect=0.202,95%CI:0.009,0.495);the proportion of mediation was 23.4%.Protective knowledge significantly mediated the association between protective training and using protective masks(indirect effect=0.157,95%CI:0.048,0.325);the propor tion of mediation was 27.2%.Conclusions:The findings of this study have provided baseline information on the current state of Chinese nurses’perceptions,knowledge,and preventive behaviors toward ADs as the crisis is *** is also recommended to improve nurses’perceptions of the risks associated with ADs.

关键词： antineoplastic drugs Chinese nurses developed city mediation occupational exposure

Pushing the high-k scalability limit with a superparaelectric gate layer

在线全文

学校读者我要写书评

暂无评论

Journal of Advanced Ceramics 2024年第4期13卷 539-547页

作者： Kun Wang Chao Liu Yuan Zhang Fuyu Lv Jun Ouyang Houbing Huang Rui-Long Yang Yu-Yao Zhao Hongbo Cheng Hanfei Zhu Xiaoming Shi Yun Tian Institute of Advanced Energy Materials and Chemistry Jinan Engineering Laboratory for Multi-scale Functional MaterialsSchool of Chemistry and Chemical EngineeringQilu University of Technology(Shandong Academy of Sciences)Jinan 250353China Key Laboratory for Liquid-Solid Structure Evolution and Processing of Materials(Ministry of Education) School of Materials Science and EngineeringShandong UniversityJinan 250061China China Tobacco Shandong Industrial Co. Ltd.Jinan 250104China Department of Materials Science and Engineering Southern University of Science and TechnologyShenzhen 518055China Key Laboratory of Key Film Materials&Application for Equipments(Hunan Province) School of Material Sciences and EngineeringXiangtan UniversityXiangtan 411105China Advanced Research Institute of Multidisciplinary Science and School of Materials Science and EngineeringBeijing Institute of TechnologyBeijing 100081China Key Laboratory of Magnetic Molecules and Magnetic Information Materials of Ministry of Education School of Chemistry and Materials ScienceShanxi Normal UniversityTaiyuan 030032China

To meet the expectation set by Moore’s law on transistors,the search for thickness-scalable high dielectric constant(k)gate layers has become an emergent research *** investigations have failed to solve the“polarizability–scalability–insulation robustness”*** this work,we show that this trilemma can be solved by using a gate layer of a high k ferroelectric oxide in its superparaelectric(SPE)*** the SPE,its polar order becomes local and is dispersed in an amorphous matrix with a crystalline size down to a few nanometers,leading to an excellent dimensional scalability and a good field-stability of the k *** an example,a stable high k value(37±3)is shown in ultrathin SPE films of(Ba_(0.95),Sr_(0.05))(Zr_(0.2),Ti_(0.8))O_(3)deposited on LaNiO_(3)-buffered Pt/Ti/SiO_(2)/(100)Si down to a 4 nm thickness,leading to a small equivalent oxide thickness of~0.46 *** aforementioned characteristic microstructure endows the SPE film a high breakdown strength(~10.5 MV·cm^(−1)for the 4 nm film),and hence ensures a low leakage current for the operation of the complementary metal oxide semiconductor(CMOS)***,a high electrical fatigue resistance is displayed by the SPE *** results reveal a great potential of superparaelectric materials as gate dielectrics in the next-generation microelectronics.

关键词： high-k transistors Moore's law superparaelectric insulation robustness

Helicobacter pylori plays a key role in gastric adenocarcinoma induced by spasmolytic polypeptide-expressing metaplasia

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

World Journal of Clinical Cases 2023年第16期11卷 3714-3724页

作者： Mian-Li Li Xin-Xin Hong Wei-Jian Zhang Yi-Zhong Liang Tian-Tian Cai Yi-Fei Xu Hua-Feng Pan Jian-Yuan Kang Shao-Ju Guo Hai-Wen Li Department of Gastroenterology Shenzhen Hospital of IntegratedTraditional Chinese and Western MedicineShenzhen 518033Guangdong ProvinceChina Department of Gastroenterology Shenzhen Traditional Chinese Medicine HospitalShenzhen 518033Guangdong ProvinceChina Science and Technology Innovation Center Guangzhou University of Traditional Chinese MedicineGuangzhou 510405Guangdong ProvinceChina

Heliobacter pylori(H. pylori), a group 1 human gastric carcinogen, is significantly associated with chronic gastritis, gastric mucosal atrophy, and gastric *** 20% of patients infected with H. pylori develop precancerous lesions, among which metaplasia is the most critical. Except for intestinal metaplasia(IM), which is characterized by goblet cells appearing in the stomach glands, one type of mucous cell metaplasia, spasmolytic polypeptide-expressing metaplasia(SPEM), has attracted much attention. Epidemiological and clinicopathological studies suggest that SPEM may be more strongly linked to gastric adenocarcinoma than IM. SPEM, characterized by abnormal expression of trefoil factor 2, mucin 6, and Griffonia simplicifolia lectin II in the deep glands of the stomach, is caused by acute injury or inflammation. Although it is generally believed that the loss of parietal cells alone is a sufficient and direct cause of SPEM, further in-depth studies have revealed the critical role of *** is controversy regarding whether SPEM cells originate from the transdifferentiation of mature chief cells or professional progenitors. SPEM plays a functional role in the repair of gastric epithelial injury. However, chronic inflammation and immune responses caused by H. pylori infection can induce further progression of SPEM to IM, dysplasia, and adenocarcinoma. SPEM cells upregulate the expression of whey acidic protein 4-disulfide core domain protein 2 and CD44 variant 9, which recruit M2 macrophages to the wound. Studies have revealed that interleukin-33, the most significantly upregulated cytokine in macrophages, promotes SPEM toward more advanced metaplasia. Overall, more effort is needed to reveal the specific mechanism of SPEM malignant progression driven by *** infection.

关键词： Gastric cancers Helicobacter pylori Intestinal metaplasia Macrophages Spasmolytic polypeptide-expressing metaplasia

Discharge area segmentation of power equipment in UV image based on GVF snake model

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

仪器仪表学报 2014年第S1期35卷 180-185页

作者： He Zhenhua Deng Wei Li Lianlian Huang Wenwu Wang Wei Liu Xuming shenzhen Power Supply bureau Corp. State Grid Electric Power Research Institute

The dynamic transmission characteristics and the sensitivities of the three stage idler gear system of the new NC power turret are studied in the paper. Considering the strongly nonlinear factors such as the periodically time-varying mesh stiffness, the nonlinear tooth backlash, the lump-parameter model of the gear system is developed with one rotational and two translational freedoms of each gear. The eigen-values and eigenvectors are derived and analyzed on the basis of the real modal theory. The sensitivities of natural frequencies to design parameters including supporting and meshing stiffnesses, gear masses, and moments of inertia by the direct differential method are also calculated. The results show the quantitative and qualitative impact of the parameters to the natural characteristics of the gear system. Furthermore, the periodic steady state solutions are obtained by the numerical approach based on the nonlinear model. These results are employed to gain insights into the primary controlling parameters, to forecast the severity of the dynamic response, and to assess the acceptability of the gear design.

关键词： UV imaging image segmentation discharge region extraction gradient vector flow snake model

Remote control of the recruitment and capture of endogenous stem cells by ultrasound for in situ repair of bone defects

在线全文

学校读者我要写书评

暂无评论

Bioactive Materials 2023年第3期21卷 223-238页

作者： Yanni He Fei Li Peng Jiang Feiyan Cai Qin Lin Meijun Zhou Hongmei Liu Fei Yan Department of Ultrasound Institute of Ultrasound in Musculoskeletal Sports MedicineGuangdong Second Provincial General HospitalGuangzhou510317PR China The Second School of Clinical Medicine Southern Medical UniversityGuangzhou510515China Paul C.Lauterbur Research Center for Biomedical Imaging Institute of Biomedical and Health EngineeringShenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen518055People’s Republic of China Center for Cell and Gene Circuit Design CAS Key Laboratory of Quantitative Engineering BiologyShenzhen Institute of Synthetic BiologyShenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen518055People’s Republic of China

Stem cell-based tissue engineering has provided a promising platform for repairing of bone ***,the use of exogenous bone marrow mesenchymal stem cells(BMSCs)still faces many challenges such as limited sources and potential *** is important to develop new approach to effectively recruit endogenous BMSCs and capture them for in situ bone ***,we designed an acoustically responsive scaffold(ARS)and embedded it into SDF-1/BMP-2 loaded hydrogel to obtain biomimetic hydrogel scaffold complexes(BSC).The SDF-1/BMP-2 cytokines can be released on demand from the BSC implanted into the defected bone via pulsed ultrasound(p-US)irradiation at optimized acoustic parameters,recruiting the endogenous BMSCs to the bone defected or BSC *** by the daily p-US irradiation for 14 days,the alginate hydrogel was degraded,resulting in the exposure of ARS to these recruited host stem *** another set of sinusoidal continuous wave ultrasound(s-US)irradiation was applied to excite the ARS intrinsic resonance,forming highly localized acoustic field around its surface and generating enhanced acoustic trapping force,by which these recruited endogenous stem cells would be captured on the scaffold,greatly promoting them to adhesively grow for in situ bone tissue *** study provides a novel and effective strategy for in situ bone defect repairing through acoustically manipulating endogenous BMSCs.

关键词： Acoustically responsive scaffolds Biomimetic hydrogel scaffold complexes Endogenous stem cells Acoustic radiation force Bone defect repairing

Isolation and phylogenetic study of Rift Valley fever virus from the first imported case to 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

Virologica Sinica 2017年第3期32卷 253-256页

作者： Yongxia Shi Kui Zheng Xiaobo Li Liqiang Li Shufen Li Jinmin Ma Jun Dai Jingkai Ji Shuai Yuan Haorong Lu Jiandong Li Fangfang Sun Xun Xu Jicheng Huang Inspection and Quarantine Technology Center Guangdong Entry-Exit Inspection and Quarantine Bureau BGI-shenzhen China National Gene Bank-shenzhen BGI-Shenzhen Department of Biology University of Copenhagen BGI Education Center University of Chinese Academy of Sciences

Dear Editor,Rift Valley fever(RVF)is an anthropozoonosis caused by Rift Valley fever virus(RVFV).RVFV belongs to the Phlebovirus genus in the family Bunyaviridae,which is circulating among *** infection with RVFV is g... 详细信息

关键词：裂谷热病毒人畜共患传染病系统进口中国反刍动物人类感染并发症

Synthesis of arylsulfonyl-substituted indolo[2,1-a]isoquinolin-6(5H)-one derivatives via a TBAI-catalyzed radical cascade cyclization

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2022年第1期33卷 276-279页

作者： Shengxian Zhai Shuxian Qiu Shuai Yang Bingyan Hua Yongsheng Niu Chuchu Han Youzhu Yu Yuchao Li Hongbin Zhai College of Chemistry&Environmental Engineering Anyang Institute of TechnologyAnyang 455000China Department of Chemistry Guangdong University of EducationGuangzhou 510303China State Key Laboratory of Chemical Oncogenomics and Key Laboratory of Chemical Genomics Shenzhen Engineering Laboratory of Nano Drug Slow-ReleaseShenzhen Graduate School of Peking UniversityShenzhen 518055China

We have developed a metal-free radical cascade reaction of N-substituted 2-aryl indoles with readily available sulfonyl hydrazides for the rapid construction of arylsulfonyl-substituted indolo[2,1-a]isoquinolin-6(5H)-one *** the TBAI–TBHP catalytic system,a broad series of structurally diverse indolo[2,1-a]isoquinolin-6(5H)-one derivatives were obtained in moderate to excellent *** reaction features mild reaction conditions,operationally easiness,scaled-up feasibility,and high functional-group-tolerance.

关键词： TBAI-catalyzed Metal-free Radical cascade Cyclization Nitrogen-containing heterocycles Fused-indole derivatives

FUTURE CHANGE OF PRECIPITATION EXTREMES OVER THE PEARL RIVER BASIN FROM REGIONAL CLIMATE MODELS

在线全文

学校读者我要写书评

暂无评论

Journal of Tropical Meteorology 2016年第1期22卷 57-65页

作者：杜尧东杨红龙曹超雄刘蔚琴 Climatic Center of Guangdong Province Guangzhou 510080 China shenzhen National Climate Observatory Shenzhen 518040 China Guangzhou Institute of Tropical and Marine Meteorology/Guangdong Provincial Key Laboratory of Numerical Modeling China Meteorological Administration Guangzhou 510080 China

Based on RegCM4,a climate model system,we simulated the distribution of the present climate(1961-1990)and the future climate(2010-2099),under emission scenarios of RCPs over the whole Pearl River *** the climate parameters,a set of mean precipitation,wet day frequency,and mean wet day intensity and several precipitation percentiles are used to assess the expected changes in daily precipitation characteristics for the 21 st *** the return values of precipitation intensity with an average return of 5,10,20,and 50 years are also used to assess the expected changes in precipitation extremes events in this *** structure of the change across the precipitation distribution is very coherent between RCP4.5 and *** annual,spring and winter average precipitation decreases while the summer and autumn average precipitation *** basic diagnostics of precipitation show that the frequency of precipitation is projected to decrease but the intensity is projected to *** wet day percentiles(q90 and q95) also increase,indicating that precipitation extremes intensity will increase in the ***,the5-year return value tends to increase by 30%-45%in the basins of Liujiang River,Red Water River,Guihe River and Pearl River Delta region,where the 5-year return value of future climate corresponds to the 8-to 10-year return value of the present climate,and the 50-year return value corresponds to the 100-year return value of the present climate over the Pearl River Delta region in the 2080 s under RCP8.5,which indicates that the warming environment will give rise to changes in the intensity and frequency of extreme precipitation events.

关键词：区域气候模式流域降水珠江流域珠江三角洲地区平均降水量降水强度极值返回值