检索结果-南通市图书馆

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

筒壁沟槽式火炮制退机的流场数值仿真

机械制造与自动化 2024年第2期53卷 153-156页

作者：徐明珂南京理工大学机械工程学院江苏南京210094

为了研究某火炮筒壁沟槽式制退机在火炮后坐运动过程中内部流体的流动状态,研究不同后坐速度下制退力的特性,应用Fluent软件建立了制退机的等效流场模型,由工作腔压力和流量,推导出液压阻力系数K并分析流速、沟槽面积和液压阻力系数K的... 详细信息

为了研究某火炮筒壁沟槽式制退机在火炮后坐运动过程中内部流体的流动状态,研究不同后坐速度下制退力的特性,应用Fluent软件建立了制退机的等效流场模型,由工作腔压力和流量,推导出液压阻力系数K并分析流速、沟槽面积和液压阻力系数K的关系。对比分析仿真和实验数据表明:无论活塞杆匀速还是变速运动,同截面上两不同流道的流液速度几乎相等,且同截面不同流道的流量比近似等于各流道的面积比。

关键词：火炮制退机流场仿真

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

女性产品广告中的男性形象及存在问题分析

艺术科技 2024年第4期37卷 211-213页

作者：许铭珂上海理工大学出版印刷与艺术设计学院上海200093

目的:随着女性主义的盛行和消费主义的兴起,男性代言人开始大量出现在女性产品广告中,文章的研究目的在于梳理女性产品广告中的男性形象类型,分析女性产品广告中男性形象存在的问题,并为女性产品广告代言人的选择提供建议。方法:在梳理... 详细信息

目的:随着女性主义的盛行和消费主义的兴起,男性代言人开始大量出现在女性产品广告中,文章的研究目的在于梳理女性产品广告中的男性形象类型,分析女性产品广告中男性形象存在的问题,并为女性产品广告代言人的选择提供建议。方法:在梳理相关概念和前人研究的基础上,以典型男性代言的女性产品广告为分析对象,对其中的男性形象元素进行梳理,结合受众认知与销售情况分析其中存在的问题,并提出优化建议。结果:当前,女性产品广告中的男性形象愈发多元,尤其是在消费主义的推动下,男性的外在形象得到凸显和强调。女性产品广告中的男性形象主要有五种类型,分别为成功精英型、温柔体贴型、鲜肉美男型、运动活力型、个性潮流型。结论:女性产品广告中的男性形象主要存在三个问题。第一,主次不分,降低产品关注度;第二,男性形象气质与产品不符,影响了产品的销量和品牌形象;第三,消费者对男性形象并不认同。因此,女性产品应凸显和强调产品本身,使代言人与产品和品牌产生紧密关联,使广告中的产品给受众留下更深刻的印象,同时要根据产品类型选择合适的代言人,以免使消费者产生反感,最后要提前调查消费者认知及代言人的相关情况,做好突发事件的应急方案,若出现突发事件,应根据情况寻找合适的新代言人,重塑消费者对产品和品牌的认知。

关键词：女性产品广告男性形象代言人

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

压铸机液压伺服系统转速环设计

电气应用 2024年第10期43卷 8-13页

作者：黄效师吴茂刚胥茗珂宁波钢铁有限公司浙江宁波315807 杭州电子科技大学浙江杭州310018

由于压铸机液压控制系统惯性大,采用常规方法设计的伺服系统转速环容易转速超调导致压力过冲,针对此问题,提出一种应用于压铸机液压伺服系统的抗饱和转速环设计方法。对采用i_(d)=0矢量控制方法的永磁同步电动机伺服系统进行了转速环设... 详细信息

由于压铸机液压控制系统惯性大,采用常规方法设计的伺服系统转速环容易转速超调导致压力过冲,针对此问题,提出一种应用于压铸机液压伺服系统的抗饱和转速环设计方法。对采用i_(d)=0矢量控制方法的永磁同步电动机伺服系统进行了转速环设计,包括转速环的结构设计和参数整定方法。结合实际应用案例,进行了仿真分析和实验验证。仿真分析表明抗饱和算法能有效抑制转速超调;实验结果表明,压铸机液压系统压力过冲小,证明所提转速环设计方法有效。

关键词：压铸机伺服系统转速环抗饱和

粮油食品企业社会责任对信贷可得性的影响研究——基于机构投资者持股的调节作用

维普期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

河南工业大学学报（社会科学版） 2024年第1期40卷 40-49页

作者：王晓刚徐茗珂赵雨路薛晨欣河南工业大学管理学院河南郑州450001

党的二十大报告指出,要确保粮食安全,加快建设农业强国。基于2010—2022年我国A股上市公司数据,以粮油食品行业中的上市企业为研究样本,构建多元回归模型研究粮油食品企业社会责任履行对信贷可得性的影响。研究发现:粮油食品企业履行社... 详细信息

党的二十大报告指出,要确保粮食安全,加快建设农业强国。基于2010—2022年我国A股上市公司数据,以粮油食品行业中的上市企业为研究样本,构建多元回归模型研究粮油食品企业社会责任履行对信贷可得性的影响。研究发现:粮油食品企业履行社会责任能有效促进信贷的可得性,伴随机构投资者持股比例的提高,两者之间的正向关系进一步强化;异质性研究发现,企业上市年限对社会责任履行和信贷可得性之间的正向关系起正向赋能作用,与其他地区相比,东部地区上市粮油食品企业的这种正向赋能作用更强一些;相较于粮油企业,食品企业的信贷可得性对社会责任履行具有更强的敏感性;托宾Q值在企业社会责任履行和信贷可得性之间的关系中起抑制作用,在总资产较高、托宾Q值更低的国有粮油食品企业中,履行社会责任和信贷可得性之间存在的正相关关系更明显。

关键词：粮油食品行业企业社会责任机构投资者持股信贷可得性

Riverine sulfate sources and behaviors in arid environment,Northwest China:Constraints from sulfur and oxygen isotopes

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2024年第3期137卷 716-731页

作者： Yifu xu Wenjing Liu Bing xu Zhifang xu Key Laboratory of Cenozoic Geology and Environment Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China Innovation Academy for Earth Science Chinese Academy of SciencesBeijing 100029China University of Chinese Academy of Sciences Beijing 100049China

The fate of riverine sulfate ion (SO_(4)^(2-)) and its environmental effects in arid environment are difficult to evaluate due to its complicated sources and strongly coupled behaviors with water cycle which is significantly modified by *** understand the sulfur cycle in aquatic systems in arid environment,the chemical and sulfur and oxygen isotopic compositions (δ^(34)S_(SO4)and δ^(18)O_(SO4)) of major rivers around the Badain Jaran Desert,northwestern China,were *** rivers had averaged SO_(4)^(2-)content at 1336μmol/L,over 10times higher than the global *** δ^(34)S_(SO4)and δ^(18)O_(SO4)values ranged from-5.3‰to+11.8‰and+1.6‰to+12.8‰,*** end-member analysis and the inverse model showed that riverine sulfate was mainly derived from evaporites dissolution (0-87%),sulfide oxidation (13%-100%) and precipitation (0-33%),indicating heterogeneity in sulfur sources and behaviors along the river drainage with the lithology variations and climate *** isotopic tools combining with hydro-chemistry compositions could be applied to reveal sulfur cycle in arid *** on the calculation,sulfide oxidation plays the primary role in the headwater and upstream in the Qilian-Mountains area,where sulfide is widely *** the proportion of evaporites dissolution contributing to riverine sulfate is much higher in downstream in a drier ***,less precipitation and higher temperature can lead to more intensive evaporation,affecting the process of sulfide oxidation and enhancing the rates of evaporites dissolution and sulfate precipitation in the basin.

关键词： Sulfur and oxygen isotopes Source apportionment Inverse model Arid environment Inland rivers Northwestern China

Laboratory evaluation of high-friction thin overlays for pavement preservation

在线全文

学校读者我要写书评

暂无评论

Frontiers of Structural and Civil Engineering 2024年第6期18卷 936-948页

作者： Ouming xu Rentao xu Lintong JIN School of Highway Chang’an UniversityXi’an 710064China School of Materials Science and Engineering Chang’an UniversityXi’an 710061China

Traditional asphalt concrete(AC)and stone matrix asphalt(SMA),which are used as thin asphalt overlays,are common maintenance strategies to enhancing ride quality,skid resistance,and ***,several studies have used a novel asphalt mixture known as a high-friction thin overlay(HFTO)to improve surface ***,it remains uncertain whether the laboratory properties of HFTO differ significantly from those of conventional *** study aims to evaluate the laboratory properties of HFTO mixtures and compare them with those of AC and *** mixtures with nominal maximum size of 9.5 mm were produced in the laboratory,and performance tests were conducted,including wheel tracking test,low temperature flexural creep test,moisture susceptibility test,Cantabro Abrasion Test,Marshall Test,sand patch test,British pendulum test,and indoor tire-rollingdown *** results showed that the HFTO exhibited a lower tire/pavement noise than the AC and ***,HFTO had superior high-temperature stability,larger macro texture,and higher skid resistance in comparison to those of AC,but lower than those of ***,HFTO mixtures may be considered a suitable replacement for traditional AC mixtures in regions where skid resistance and noise reduction are concerns.

关键词： road engineering pavement maintenance high friction thin overlay performance skid resistance tire/pavement noise

Aldehyde oxidase mediated enantioselective metabolic health risk of dinotefuran

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

Science China Chemistry 2024年第6期67卷 2079-2091页

作者： Liwei xu Xinxin xu Hua Kuang Chuanlai xu Xiaoling Wu State Key Laboratory of Food Science and Resources Jiangnan UniversityWuxi214122China International Joint Research Laboratory for Biointerface and Biodetection and School of Food Science and Technology Jiangnan UniversityWuxi214122China Collaborative Innovation center of Food Safety and Quality Control in Jiangsu Province Jiangnan UniversityWuxi214122China

Chiral pollutants often pose significant differential environmental health *** this study,the biotransformation of chiral dinotefuran(DIN)and its enantioselective metabolic toxicity mechanisms have been systemically ***,reversedphase chromatography-high resolution mass spectrometry was developed to quantify the content of DIN R/S chiral enantiomer with pg level sensitivity,revealing a lower elimination rate constant(K_(e))of S-DIN(0.730 h^(-1))than R-DIN(0.746 h^(-1)).Secondly,the interaction mechanism between DIN metabolism and important endogenous bioactive molecules,such as aldehyde oxidase(AOX)and neurotransmitters,was *** DIN nitro-group was converted into a guanidine group by the reducing site of nearby flavin adenine dinucleotide(FAD)in AOX with the preferred higher affinity of ***,the endogenous tryptophan(Trp)aldehyde metabolic intermediate,5-hydroxyindoleacetaldehyde(5-HIAL),provides a persistent electron donor for DIN reduction via the oxidation-catalyzed site in AOX,resulting in remarkable up-regulation of monoamine neurotransmitters such as serotonin and ***,the higher level of neurotransmitters further mediated dysregulation of oxylipin homeostasis via the serotonergic pathway,where S-DIN exhibited more pronounced liver lipid damage and environmental health risk with the accumulated lipid biomarkers,oxidized triglyceride(OxTG)and oxidized sphingomyelin(OxSM).This study elucidates the AOX-mediated enantioselectivity metabolic pathway of DIN,providing a new analytical method for chiral pollutants and paves the way for their health risk assessments.

关键词： neonicotinoid dinotefuran enantiomer aldehyde oxidase metabolomics health risk

Granting strength to aerogel fibers through encapsulation

在线全文

学校读者我要写书评

暂无评论

Science China Materials 2024年第4期67卷 1365-1366页

作者： Wenhui xu Department of Basic Chemistry School of PharmacyJiangxi University of Chinese MedicineNanchang 330004China

Aerogel fibers, distinguished by their lightweight nature, pronounced porosity, large surface area, and superior thermal insulation properties, have diversified applications in thermal management, energy devices, and environmental remediation[1]. However, compared with monolithic ones, these fibershaped aerogels exhibit limited mechanical strength and resilience due to their one-dimensional small size.

关键词： strength fibers thermal

Skeletal interoception in osteoarthritis

在线全文

学校读者我要写书评

暂无评论

Bone Research 2024年第2期12卷 241-254页

作者： Dinglong Yang Jiawen xu Ke xu Peng xu Department of Joint Surgery Honghui HospitalXi’an Jiaotong UniversityXi’an 710054China Department of Orthopedic Surgery and Orthopedic Research Institute West China HospitalSichuan UniversityChengdu 610041China

The interoception maintains proper physiological conditions and metabolic homeostasis by releasing regulatory signals after perceving changes in the internal state of the *** its various forms,skeletal interoception specifically regulates the metabolic homeostasis of ***(OA)is a complex joint disorder involving cartilage,subchondral bone,and *** subchondral bone undergoes continuous remodeling to adapt to dynamic joint *** findings highlight that skeletal interoception mediated by aberrant mechanical loads contributes to pathological remodeling of the subchondral bone,resulting in subchondral bone sclerosis in *** skeletal interoception is also a potential mechanism for chronic synovial inflammation in *** this review,we offer a general overview of interoception,specifically skeletal interoception,subchondral bone microenviroment and the aberrant subchondral *** also discuss the role of skeletal interoception in abnormal subchondral bone remodeling and synovial inflammation in OA,as well as the potential prospects and challenges in exploring novel OA therapies that target skeletal interoception.

关键词： homeostasis inflammation releasing