检索结果-南通市图书馆

在线全文

学校读者我要写书评

暂无评论

高管权力、环境责任与市场价值

华北电力大学学报（社会科学版） 2024年第5期 46-57页

作者：李涛张欣宇伊力奇华北电力大学经济与管理学院北京102206 内蒙古财经大学会计学院内蒙古自治区呼和浩特010051

高管权力、环境履责与市场价值三者之间表现为何种相关关系,高管权力特征是否可以在环境履责与市场价值之间发挥调节作用,对上述问题的研究有利于企业更好的贯彻执行“双碳”目标、塑造良好企业形象、走可持续发展之路。本文以2011—202... 详细信息

高管权力、环境履责与市场价值三者之间表现为何种相关关系,高管权力特征是否可以在环境履责与市场价值之间发挥调节作用,对上述问题的研究有利于企业更好的贯彻执行“双碳”目标、塑造良好企业形象、走可持续发展之路。本文以2011—2021年中国沪深交易所A股上市企业为研究样本,检验了高管权力、环境责任与市场价值三者间的相关关系以及高管权力具体特征的调节效应。研究结果表明:高管权力与环境履责以及市场价值呈现显著的正向关系,并且企业环境责任承担对市场价值存在正向影响。此外,高管兼任股东单位职务对环境责任与市场价值的相关关系存在显著的正向调节作用。基于上述结果,提出树立高管环境治理理念、鼓励地方政府考察企业环境治理能力、完善环境信息披露制度的建议。

关键词：高管权力环境责任市场价值调节效应

城市文化建设的成就与挑战——以哈尔滨市城市文化建设为例

在线全文

学校读者我要写书评

暂无评论

当代教研论丛 2024年第3期10卷 121-124页

作者：李轶琦常淑云哈尔滨学院黑龙江哈尔滨150086

城市文化建设是城市发展的重要组成部分,对于提升城市形象、增强城市竞争力具有重要意义。作为东北地区的重要城市,哈尔滨市的城市文化建设具有一定的特殊性和重要性。文章探讨了哈尔滨城市文化建设的现状,基于其存在的问题提出了相应... 详细信息

城市文化建设是城市发展的重要组成部分,对于提升城市形象、增强城市竞争力具有重要意义。作为东北地区的重要城市,哈尔滨市的城市文化建设具有一定的特殊性和重要性。文章探讨了哈尔滨城市文化建设的现状,基于其存在的问题提出了相应的解决方案和建议,以期为哈尔滨市的城市文化建设提供参考。

关键词：城市文化建设实践路径

Dependence of Size and Morphology on Shear Flow for PS-based Amphiphilic Block Copolymer Micelles in Aqueous Solution

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2017年第5期35卷 641-648页

作者： Zhi-da Wang Chang-feng Yan ying Huang li-qi yi Key Laboratory of Renewable Energy Guangzhou Institute of Energy ConversionChinese Academy of Sciences Guangdong Key Laboratory of New and Renewable Energy Research and Development University of Chinese Academy of Sciences

This contribution focuses on the impact of shear flow on size and nanostructure of PS-based amphiphilic block copolymer （BC） micelles by varying the stirring rate and copolymer composition. The results show that the vesicles formed from diblock copolymer （di-BC） of PS-b-PAA remain with vesicular morphology, although the average size decreases, with the increase of stirring rate. However, the multi-compartment micelles （MCMs） formed from tri-block copolymer （tri-BC） of PS-b-P2VP-b-PEO are quite intricate, in which the copolymer first self-assembles into spheres, then to clusters, to large compound micelles （LCMs）, and finally back to spheres, as stirring rate increases from 100 r/min to 2200 r/min. Formation mechanism studies manifest that vesicles form simultaneously as water is added to the di-BC solution, termed as direct- assembly, and remain with vesicular structure in the flowing process. While for the PS-b-P2VP-b-PEO copolymer, spherical micelles at initial stage can further assemble into clusters and LCMs, termed as second-assembly, due to the speeding-up- aggregation of the favorable stirring. As a result, an invert V-relationship between tri-BC micelle dimension and stirring rate is observed in contrast to the non-linear decreasing curve of di-BC vesicles. It is by investigating these various amphiphilic BCs that the understanding of shear dependence of size and morphology of micelles is improved from self-assembly to second-assembly process.

关键词： Self-assembly Shear Size Nanostructure Block copolymer

Visible light Indoor Positioning System Based on Pisarenko Harmonic Decomposition and Neural Network

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Electronics 2024年第1期33卷 195-203页

作者： li ZHAO yi REN qi WANG Lange DENG Feng ZHANG School of Electronic Information Engineering Xi’an Technological University

Visible-light indoor positioning is a new generation of positioning technology that can be integrated into smart lighting and optical communications. The current received signal strength(RSS)-based visible-light positioning systems struggle to overcome the interferences of background and indoor-reflected noise. Meanwhile, when ensuring the lighting, it is impossible to use the superposition of each light source to accurately distinguish light source information; furthermore, it is difficult to achieve accurate positioning in complex indoor environments. This study proposes an indoor positioning method based on a combination of power spectral density detection and a neural network. The system integrates the mechanism for visible-light radiation detection with RSS theory, to build a back propagation neural network model fitting for multiple reflection channels. Different frequency signals are loaded to different light sources at the beacon end, and the characteristic frequency and power vectors are obtained at the location end using the Pisarenko harmonic decomposition method. Then, a complete fingerprint database is established to train the neural network model and conduct location tests. Finally, the location effectiveness of the proposed algorithm is verified via actual positioning experiments. The simulation results show that, when four groups of sinusoidal waves with different frequencies are superimposed with white noise, the maximum frequency error is 0.104 Hz and the maximum power error is 0.0362 W. For the measured positioning stage, a 0.8 m × 0.8 m × 0.8 m solid wood stereoscopic positioning model is constructed, and the average error is 4.28 cm. This study provides an effective method for separating multi-source signal energies, overcoming background noise, and improving indoor visible-light positioning accuracies.

关键词： Neural networks Measurement uncertainty Position measurement Harmonic analysis light emitting diodes Frequency estimation Indoor positioning systems

Hybrid Analytical and Data-Driven Model Based Instance-Transfer Method for Power System Online Transient Stability Assessment

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

CSEE Journal of Power and Energy Systems 2024年第4期10卷 1664-1675页

作者： Feng li qi Wang yi Tang Yan Xu Jie Dang School of Electrical Engineering Southeast UniversityNanjing 210000China Center for Power Engineering(CPE) School of Electrical and Electronic EngineeringNanyang Technological UniversitySingapore 639798Singapore Central China Branch of State Grid Corporation of China Wuhan 430077China

Data-driven methods are widely recognized and generate conducive results for online transient stability ***,the tedious and time-consuming process of sample collection is often *** functioning of power systems involves repetitive sample collection due to the constant variations occurring in the operation mode,thereby highlighting the importance of collection *** a means to achieve high sample collection efficiency following the operation mode change,we propose a novel instance-transfer method based on compression and matching strategy,which facilitates the direct acquisition of useful previous samples,used for creating the new sample ***,we present a hybrid model to ensure rationality in the process of sample similarity comparison and selection,where features of analytical modeling with special significance are introduced into data-driven *** the same time,a data-driven method can also be integrated in the hybrid model to achieve rapid error correction of analytical models,enabling fast and accurate post-disturbance transient stability *** a paradigm,we consider a scheme for online critical clearing time estimation,where integrated extended equal area criterion and extreme learning machine are employed as analytical model part and data-driven error correction model part,*** results validate the credible efficacy of the proposed method.

关键词： Critical clearing time extreme learning machine instance-transfer method transient stability assessment

Gabapentinoids for the treatment of stroke

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

Neural Regeneration Research 2024年第7期19卷 1509-1516页

作者： ying Zhang Chenyu Zhang Xiaoli yi qi Wang Tiejun Zhang Yuwen li Department of Pharmacy West China HospitalSichuan UniversityChengduSichuan ProvinceChina Department of Neurosurgery West China HospitalSichuan UniversityChengduSichuan ProvinceChina

Gabapentinoid drugs(pregabalin and gabapentin) have been successfully used in the treatment of neuro pathic pain and in focal seizure *** research has demonstrated their potent activities in modulating neurotransmitter release in neuronal tissue,oxidative stress,and inflammation,which matches the mechanism of action via voltage-gated calcium *** this review,we briefly elaborate on the medicinal history and ligand-binding sites of *** systematically summarize the preclinical and clinical research on gabapentinoids in stroke,including ischemic stro ke,intracerebral hemorrhage,subarachnoid hemorrhage,seizures after stro ke,cortical spreading depolarization after stroke,pain after stroke,and nerve regeneration after stro *** review also discusses the potential to rgets of gabapentinoids in stroke;however,the existing results are still unce rtain regarding the effect of gabapentinoids on stroke and related *** preclinical and clinical trials are needed to test the therapeutic potential of gabapentinoids in ***,gabapentinoids have both opportunities and challenges in the treatment of stroke.

关键词： cortical spreading depolarization gabapentinoid intracerebral hemorrhage pain after stroke stroke subarachnoid hemorrhage

Host-induced silencing of MpPar6 confers Myzus persicae resistance in transgenic rape plants

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Agriculture 2024年第1期23卷 187-194页

作者： qi Zhang Wenqin Zhan Chao li ling Chang yi Dong Jiang Zhang State Key Laboratory of Biocatalysis and Enzyme Engineering School of Life SciencesHubei UniversityWuhan 430062China Oil Crops Research Institute Chinese Academy of Agricultural SciencesWuhan 430062China Agricultural Genomics Institute at Shenzhen Chinese Academy of Agricultural SciencesShenzhen 518000China

Plant-mediated RNA interference(RNAi)has emerged as a promising technology for insect *** green peach aphid,Myzus persicae,feeds on over 400 species of host *** napus(rape)is the second most important oilseed crop *** persicae is highly reproductive and causes severe damage to the rape plants due to its quite flexible life *** this study,we tested the RNAi effects of transgenic rape plants on *** in vitro feeding *** with artificial diets containing double-stranded RNAs(dsRNAs)targeting seven aphid genes,we identified a new gene encoding the partitioning-defective protein 6(Par6)as the most potent RNAi ***-and stage-expression analysis of Par6 suggested this gene is highly expressed in the embryo and adult stage of *** next generated transgenic rape plants expressing ds Par6 by Agrobacteriummediated transformation and obtained nine independent transgenic *** to wild-type control plants,transgenic rape lines expressing ds Par6 showed strong resistance to *** assays revealed that feeding transgenic rape plants to *** significantly decreased MpPar6 expression and survival rate and impaired ***,we showed that the resistance levels to *** are positively correlated with ds Par6 expression levels in transgenic rape *** study demonstrates that transgenic rape plants expressing ds Par6 are efficiently protected from *** with the genes involved in embryo development could be the effective RNAi targets for controlling aphids and potentially other insect pests.

关键词： oilseed rape pest control aphid double-stranded RNA RNA interference

Trench gate GaN IGBT with controlled hole injection efficiency

在线全文

学校读者我要写书评

暂无评论

The Journal of China Universities of Posts and Telecommunications 2024年第2期31卷 10-16页

作者： Huang yi li Yueyue Gao Sheng Wang qi liu Bin Han Genquan School of Optoelectronic Engineering Chongqing University of Posts and TelecommunicationsChongqing 400065China School of Electronic Science and Engineering Nanjing UniversityNanjing 210008China School of Microelectronics Xidian UniversityXi’an 710126China

In this paper,a novel trench gate gallium nitride(GaN)insulated gate bipolar transistor(GaN IGBT),in which the collector is divided into multiple regions to control the hole injection efficiency,is designed and theoretically *** incorporation of a P+/P-multi-region alternating structure in the collector region mitigates hole injection within the collector *** the device is in forward conduction,the conductivity modulation effect results in a reduced storage of carriers in the drift *** a result,the number of carriers requiring extraction during device turn-off is minimized,leading to a faster turn-off *** results illustrate that the GaN IGBT with controlled hole injection efficiency(CEH GaN IGBT)exhibits markedly enhanced performance compared to conventional GaN IGBT,showing a remarkable 42.2%reduction in turn-off time and a notable 28.5%decrease in turn-off loss.

关键词： gallium nitride insulated gate bipolar transistor(GaN IGBT) hole injection trench gate turn-off loss

Recent Progress on Water-based liquid Embolic Agents in Endovascular Treatment

在线全文

学校读者我要写书评

暂无评论

CHEMICAL RESEARCH IN CHINESE UNIVERSITIES 2024年第5期40卷 776-785页

作者： qi, yi Fan, Hailong Hokkaido Univ Dept Hematol Fac Med Sapporo 0608638 Japan Hokkaido Univ Grad Sch Med Sapporo 0608638 Japan Hokkaido Univ Inst Chem React Design & Discovery WPI ICReDD Sapporo 0010021 Japan

Vascular embolization treatment, a minimally invasive surgery for various blood vessel-related conditions, has emerged as a crucial method in treating such as hemorrhage, arteriovenous malformation, aneurysms, and hypervascular tumors. liquid embolic agents are gaining prominence due to their distinct advantage in infiltrating distal regions, expanding the scope of embolization beyond the reach of solid agents. Recent strides in biomaterials and technologies have spurred the development of novel liquid embolic agents, addressing challenges posed by traditional options. This mini-review provides a concise overview of the recent progress in water-based liquid embolic agents, highlighting their potential to overcome limitations associated with current embolic materials. By presenting selected research outcomes, we illuminate advancements that enhance the efficacy of liquid embolic agents. Furthermore, the review outlines essential properties for effective liquid embolic agents, offering insights for future developments in this field.

关键词： Endovascular treatment Lquid embolic agent Hydrogel TRANSCATHETER ARTERIAL EMBOliZATION BENIGN PROSTATIC HYPERPLASIA ELASTINliKE PROTEIN POLYMER HEPATOCELLULAR-CARCINOMA POTENTIAL APPliCATION METHYLACRYLATE) NANOGEL VASCULAR OCCLUSION IN-VIVO PH HYDROGELS