检索结果-南通市图书馆

Dynamic phasor-based hybrid simulation for multi-inverter grid-connected system

在线全文

学校读者我要写书评

暂无评论

Global Energy Interconnection 2023年第2期6卷 197-204页

作者： Peng Yang Qian Li junyu zhao Juanjuan Lu Yunfei Xu State Grid Hebei Electric Power Co.Ltd. Shijiazhuang 050021P.R.China State Grid Baoding Power Supply Company Baoding 071051P.R.China State Grid Smart Grid Research Institute Co.Ltd. Beijing 102200P.R.China

To realize the efficient transient simulation of a grid-connected power generation system based on multiple inverters, this paper proposes a hybrid simulation method integrating the models of electromagnetic transient and dynamic phasors. Based on a demonstration of the concepts and properties of dynamic phasors, the models of single-phase and three-phase inverters described by dynamic phasors are established first. Considering the numerical compatibility problem between dynamic phasors and instantaneous values, an interface scheme between dynamic phasors and instantaneous values is designed, and the efficiency and precision differences of various transformation methods are compared in ***, by utilizing MATLAB/Simulink, a hybrid simulation platform of a multi-inverter grid-connected system is built, and the efficiency and accuracy of the hybrid simulation are validated via comparison with the full electromagnetic transient simulation.

关键词： Multi-inverter grid-connected system Electromagnetic transient Dynamic phasor Hybrid simulation

Effects of creative expression program on the event-related potential and task reaction time of elderly with mild cognitive impairment

在线全文

学校读者我要写书评

暂无评论

International Journal of Nursing Sciences 2021年第1期8卷 38-42,I0003页

作者： junyu zhao Hong Li Rong Lin Minzhi Xie Yinzhou Wang Huiying Chen School of Nursing Fujian Medical UniversityFuzhouChina Department of Nursing Fujian Provincial HospitalFuzhouChina Department of Neurology Fujian Provincial HospitalFuzhouChina Center of Patients Admission and Discharge Service Fujian Provincial HospitalFuzhouChina

Objectives:This study aimed to evaluate the effects of a 16-week creative expression intervention program(CrExp)on the event-related potential(ERP)and task reaction time in older individuals with mild cognitive impairment(MCI).Methods:This study is a randomized controlled clinical trial conducted in the Memory Center of Fujian Provincial ***-six MCI patients were randomly distributed into two *** group underwent a 16-week creative expression program(CrExp,n=18)and the other performed as a control group(CG,n=18)by general social *** amplitude and latency of ERP-P300 from the central(Cz),parietal(Pz),frontal(Fz)cortices and task reaction time(RT)were assessed at baseline,postinterventi on,and 24-week ***:The CrExp group showed greater differences than CG of P300 latency in Cz(F=4.37,P=0.015),Pz(F=2.78,P=0.009),Fz(F=6.45,P=0.031)brain area after 16 weeks of intervention and in Fz(F=3.23,P=0.028),Cz(F=3.79,P=0.024),and Pz(F=5.60,P=0.036)at 24 weeks ***,we analyzed the task reaction time between two groups and found that a shorten reaction time at postintervention(F=4.47,P=0.011)and 24 weeks follow-up(F=3.12,P=0.007)in the CrExp ***,there was no difference in P300 amplitude in either brain area between the two ***:The electrophysiological results of the creative expression cognitive therapy group were more obvious than those of the general cognitive therapy group,and the latency and task reaction time may be considered as supported parameters in diagnosing the effects during non-drug therapy intervention in clinical practice.

关键词： Aged Cognitive therapy Event-related potentials Mild cognitive impairment Reaction time

Efficacy and safety of vitamin D3 in patients with diabetic nephropathy： a meta-analysis of randomized controlled trials

在线全文

学校读者我要写书评

暂无评论

Chinese Medical Journal 2014年第15期127卷 2837-2843页

作者： zhao junyu Dong Jianjun Wang Haipeng Shang Hongxia Zhang Dongmei Liao Lin Division of Endocrinology Department of Internal MedicineShandong Provincial Qianfoshan Hospital Jinan Shandong 250014China Division of Endocrinology Department of Internal Medicine QiluHospital of Shandong University Jinan Shandong 250012 China Shandong Medical Imaging Research Institute Shandong UniversityJinan Shandong 250021 China

Background Several studies found that vitamin D3 might alter glucose metabolism,protect kidney from injury and even proposed the *** results from previous studies have been *** aim of this study was to evaluate the efficacy and safety of vitamin D3 in patients with diabetic *** underlying mechanism of vitamin D3 decreasing proteinuria is also *** We conducted a search of English and Chinese articles using database of Pubmed,Embase,Sinomed,CNKI,Wanfang and clinical trial register centers,for randomized controlled trials of vitamin D3 in diabetic nephropathy *** reviewers performed ***-analysis was used when studies were homogeneous *** Twenty studies,including 1 497 patients with diabetic nephropathy,were involved in this systemic *** D3-treated patients with diabetic nephropathy had a statistically significant reduction in 24-hour proteinuria （weighted mean difference-0.44,95% CI-0.54 to-0.34,Z=8.80,P 〈0.000 01） and urine albumin/creatine ratio （standardized mean difference-0.29,95% CI-0.48 to-0.10,Z=2.96,P=0.003）.But vitamin D3 supplementation did not significantly reduce blood pressure and hemoglobin A1c compared with control *** potential mechanisms about the renal protection of vitamin D3,including the inhibition of rennin-angiotensin system,the protection of kidney from inflammation,fibrosis and the structure change of kidney are *** addition,vitamin D3 did not significantly increase the incidence of adverse effects,including total adverse effects,gastrointestinal adverse effects and fluctuation of blood *** Vitamin D3 can ameliorate proteinuria and protect kidney from injury in patients with diabetic *** renoprotective effect is independent of blood pressure and glucose *** it does not increase any adverse effects than control,even in combination therapy with angiotensin converting enzyme inhibitors/angiotensin r

关键词： diabetic nephropathy vitamin D3 randomized controlled trials systemic review meta-analysis

Progress of Mid Infrared Spectroscopy in Soil Environment Research

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Meteorological and Environmental Research 2021年第3期12卷 1-5,10页

作者： Zehong zhao Jian TANG junyu zhao Zuoyu QIN Huili WANG Yuanyuan SHI Guangxi Zhuang Autonomous Region Forestry Research Institute/Guangxi Research and Development Center for New Forestry Fertilizer/Guangxi Key Laboratory of Superior Timber Trees Resource Cultivation Nanning 530002China

Soil is the basis of agricultural and forestry production,and it is of great significance to obtain soil information efficiently and comprehensively for soil *** to the complexity of soil organic components,it is difficult to obtain the information of soil organic components comprehensively by traditional chemical analysis *** a non-destructive,real-time and high-throughput analysis method,mid infrared spectroscopy(MIR)has the ability to obtain soil organic environmental information efficiently and *** can provide a large number of basic data for soil environmental monitoring,digital mapping,agricultural and forestry production,and help to realize the real-time monitoring of soil environment and the informatization of agriculture and *** this paper,the detection process of MIR obtaining soil environmental spectral information and processing methods of spectral data were briefly introduced,and the research progress on extraction and influencing factors of mid infrared spectrum characteristics of soil in recent years was ***,the significance and future development direction of soil science for the technology were discussed.

关键词： Organic matter Soil environment Spectroscopy analysis Portable spectrometer Allelopathy Agricultural informatization Research progress

Analysis of Soil Fertility Evolution Characteristics in Main Eucalyptus Producing Areas of Guangxi from 1993 to 2018

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Meteorological and Environmental Research 2021年第5期12卷 55-59,64页

作者： Chongfu XIAO Jian TANG junyu zhao Zuoyu QIN Huili WANG Yuanyuan SHI Zehong zhao Guaugxi State-owned Huangmian Forest Farm Luzhai 545600China Guangxi Zhuang Autonomous Region Forestry Research Institute Guangxi Research and Development Center for New Forestry FertilizerKey Laboratory of Central South Fast-growing Timber Cultivation of Forestry Ministry of ChinaNanning 530002China

The research aimed to explore the impact of long-term continuous planting management mode on soil fertility evolution of eucalyptus plantation in Guangxi and evolution characteristics of each soil fertility index,and establish a reasonable management method of eucalyptus plantation in *** production area of eucalyptus in Guangxi was taken as the research object,and the soil fertility quality of eucalyptus plantation in Guangxi from 1993 to 2018 was evaluated by means of fuzzy mathematics by selecting soil chemical properties such as p H,organic matter,total nitrogen,total phosphorus,total potassium,alkali-hydrolyzed nitrogen,available phosphorus and available *** results showed that the soil p H value of eucalyptus plantation in Guangxi decreased from 4.83 to 4.63,a decrease of 4.14%.The contents of soil organic matter,total phosphorus,available nitrogen and available potassium all showed a significant decreasing *** soil fertility quality index( IFI) was between 0.475 and 0.613,and the overall fertility index was *** soil of eucalyptus plantation in Guangxi showed a trend of acidification under continuous management during *** the actual production,it should pay more attention to soil improvement,advocate soil testing and reasonable fertilization,reduce the use of acid fertilizer,increase the application of organic fertilizer and slow release fertilizer,and ensure the ecological health and sustainable development of eucalyptus plantation.

关键词： Eucalyptus Long-term continuous cropping High strength Plantation Soil fertility evaluation

Evaluation of Soil Fertility Quality and Environmental Driving Factors in Different Soil Types of Artificial Forests

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Meteorological and Environmental Research 2024年第2期15卷 64-70页

作者： Songyu YU Zhenhui LIAO Mingwu YANG Ronghui HU Yuanyuan SHI junyu zhao Guangxi Zhuang Autonomous Region State-owned Sanmenjiang Forest Farm Liuzhou 545006China Guangxi Zhuang Autonomous Region State-owned Huangmian Forest Farm Luzhai 545618China Guangxi Forestry Research Institute Nanning 530002China

The aim was to clarify the environmental driving factors of soil fertility indicators in artificial forests of Guangxi and comprehensively evaluate the soil fertility *** collecting data on the current status of soil in artificial forests,the spatial distribution of major soil fertility indicators was analyzed,and the distribution map of the fertility index of artificial forests in the entire region and the comprehensive fertility index of artificial forests of different soil types were *** correspondence analysis method was used to analyze soil fertility indicators and environmental factors,and the environmental driving factors of soil fertility indicators for artificial forests of the main soil types in Guangxi were *** results showed that over 90%of the soil fertility index of artificial forests in the entire region was between 0.20 and *** order of soil fertility index of different soil types of artificial forests from high to low was yellow brown soil>yellow red soil>yellow soil>red soil>limestone soil>latosolic red soil>*** artificial forests of latosolic red soil,the correlation between soil alkaline nitrogen and organic matter,annual average temperature was high,while the correlation between soil available phosphorus and organic matter,pH was high,and the correlation between soil available potassium and environmental factors such as slope,altitude,rainfall,accumulated temperature,and slope aspect was *** artificial forests of red soil,the correlation between soil alkaline nitrogen and slope,altitude was high,while the correlation between soil available phosphorus and accumulated temperature,rainfall was high,and the correlation between soil available potassium and pH was *** artificial forests of limestone soil,there was a high correlation between soil alkaline nitrogen and slope,organic matter,a high correlation between soil available phosphorus and accumulated temperature,rainfall,and a high correlation bet

关键词： Soil fertility index GIS Forest soil Canonical correspondence analysis

Should radioactive iodine therapy be administrated in patient of papillary thyroid carcinoma co-existence with medullary thyroid carcinoma？

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 Medical Journal 2014年第16期127卷 3039-3040页

作者： zhao junyu Dong Jianjun Sun Qing Wang Huanjun Zhang Zhongwen Zhou Xiaojun Liao Lin Division of Endocrinology Department of lntemal Medicine Shandong Provincial Qianfoshan Hospital Jinan Shandong 250014 China Department of Pathology Shandong Provincial Qianfoshan Hospital Jinan Shandong 250014 China Division of Endocrinology Department of Internal Medicine Qilu Hospital of Shandong University Jinan Shandong 250012 China

To the editor： A 57-year-old Chinese man was found to have multiple thyroid nodules by thyroid ultrasoundgraphy one year ago. The patient felt discomfort when swallowing since five months ago and a weight loss of 7 kg in five months. He denied any history of radiation in head and neck, and no family history of thyroid cancer and other endocrine disease. An enlarged thyroid and two hypoechoic nodules measuring about 17 mm × 11 mm and 6 mm × 5 mm in the right lobe with ill-defined boundary, inhomogeneous parenchyma and hyperechoic spots inside were detected by ultrasoundgraphy.

关键词：癌碘家庭甲状腺甲状腺肿瘤血气分析钴铍

Effects of Long-term Application of Bag-controlled Slow-release Fertilizer on the Form and Availability of Phosphorus in Red Soil of Southern China

在线全文

学校读者我要写书评

暂无评论

Meteorological and Environmental Research 2022年第5期13卷 98-102页

作者： junyu zhao Bo PAN Zuoyu QIN Jian TANG Huili WANG Xiaorui HUANG Jizhao CAO Guangxi Zhuang Autonomous Region Forestry Research Institute Nanning 530002China Guangxi Research and Development Center for New Forestry Fertilizer Nanning 530002China

The insufficient supply of phosphorus is the main problem facing agriculture and forestry production in red soil region of southern *** investigate whether applying bag-controlled slow-release fertilizer can improve the phosphorus availability and available phosphorus component content,with Gaofeng State-owned Eucalyptus Plantations Forest Farm in Guangxi red soil region as the research object,comparative test of different fertilizer types and fertilizer amount of bag-controlled slow-release fertilizer with conventional fertilization(G1),bag-controlled slow-release fertilizer with reducing fertilization(G2),traditional compound fertilizer(G3),basal fertilizer(G4),and no fertilization(G5)was *** phosphorus classification method was used to determine the content of phosphorus components in the soil,and redundancy analysis was used to study the effects of components on tree *** results showed that:compared with traditional fertilization,bag-controlled slow-release fertilizer significantly increased the contents of AP,Pi,Fe-P and other components in soil;the phosphorus activation coefficients of G2 and G1 were significantly higher than those of the other three treatments,and the order was G2>G1>G4>G5>G3;redundancy analysis showed that PAC and Fe-P had the most significant effect on plant growth among all phosphorus *** application of bag-controlled slow-release fertilizer in red soil of eucalyptus plantation in southern China could promote the accumulation of phosphorus and increase the phosphorus *** mechanism of higher phosphorus use efficiency in bag-controlled slow-release fertilizer was mainly through the sustained phosphorus input and reducing phosphorus immobilization in soil by obstructing the contact of phosphorus with acid soil,to guarantee the phosphorus supply in tree growth process.

关键词： Bag-controlled slow-release fertilizer Phosphorus components Traditional fertilization Redundancy analysis

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

面向制造环境的工业机器人节能轨迹规划

机器人 2021年第6期43卷 653-663页

作者：赵俊宇张平李方陈昕叶华南理工大学计算机科学与工程学院广东广州510006

在制造环境中,工业机器人节能轨迹规划的实际应用存在2个问题:机器人动力学参数未知;现有节能轨迹规划方法无法保证结果的稳定性.因此,本文提出了面向制造环境的工业机器人节能轨迹规划,包括基于平行BP(backpropagation)神经网络的近似... 详细信息

在制造环境中,工业机器人节能轨迹规划的实际应用存在2个问题:机器人动力学参数未知;现有节能轨迹规划方法无法保证结果的稳定性.因此,本文提出了面向制造环境的工业机器人节能轨迹规划,包括基于平行BP(backpropagation)神经网络的近似动力学辨识和基于凸优化(CO)的节能轨迹求解法.以UR3机器人为实验平台,近似动力学模型的均方根误差(RMSE)可收敛至2.05×10^(−3) N·m;且凸优化轨迹规划的求解稳定性优于现有的参数化轨迹规划.实验结果表明:本文提出的节能轨迹规划方案,能应对制造环境中机器人动力学参数未知的情况,同时保证轨迹规划结果的稳定性,因此更适用于制造环境中的工业机器人.

关键词：智能制造工业机器人节能轨迹规划动力学辨识神经网络凸优化

同方期刊数据库