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

农村随迁老人的社会融入研究

西安交通大学学报（社会科学版） 2019年第2期39卷 90-100页

作者：靳小怡刘妍珺西安交通大学公共政策与管理学院陕西西安710049

随着举家迁移成为农村人口流动的主要迁移模式,农村随迁老人的规模不断扩大,"人的城镇化"和农业转移人口市民化的目标群体亟需从农民工群体扩展到随迁老人,随迁老人的社会融入日益成为重要的社会问题。本文利用2013年12月深圳市P区"农... 详细信息

随着举家迁移成为农村人口流动的主要迁移模式,农村随迁老人的规模不断扩大,"人的城镇化"和农业转移人口市民化的目标群体亟需从农民工群体扩展到随迁老人,随迁老人的社会融入日益成为重要的社会问题。本文利用2013年12月深圳市P区"农村随迁老人生活状况专项调查"数据,构建农村随迁老人社会适应、心理接纳和身份认同等三个层次的社会融入框架,分析人力资本与社会资本对其社会融入水平的影响。研究发现,农村随迁老人的总体社会融入状况较好,尤其在心理维度表现出对城市人较高的接纳程度;人力资本的提升会促进农村随迁老人的社会融入;流入地的社会资本对农村随迁老人社会融入具有促进作用;经济水平的提升对农村随迁老人社会融入具有双重作用,退休金或养老金金额的增长有助于老人更快适应城市,但子女或亲属给予的经济支持却对其社会融入产生阻碍作用。

关键词：人口流动城镇化老龄化农村随迁老人社会融入人力资本社会资本

城镇化背景下农民工家庭代际关系及影响因素:基于性别与代次的分析

在线全文

学校读者我要写书评

暂无评论

当代经济科学 2021年第3期43卷 68-82页

作者：靳小怡刘妍珺杜巍西安交通大学公共政策与管理学院陕西西安710049

在快速城镇化背景下,中国农民工家庭的代际关系也处在不断变迁中。本文利用2018年“百村调查”数据,使用潜在类别分析方法,发现农民工家庭存在紧密型、传统型、接受型、亲近型和疏离型等五种代际关系类型,传统农村家庭代际关系已经衍生... 详细信息

在快速城镇化背景下,中国农民工家庭的代际关系也处在不断变迁中。本文利用2018年“百村调查”数据,使用潜在类别分析方法,发现农民工家庭存在紧密型、传统型、接受型、亲近型和疏离型等五种代际关系类型,传统农村家庭代际关系已经衍生发展出多种类型。其中,男性农民工更容易与父母产生紧密型或接受型关系,女性农民工更可能与父母有亲近型、传统型、疏离型关系;而新一代农民工更容易与父母产生紧密型、接受型、亲近型关系,老一代农民工更可能与父母有传统型或疏离型关系。同时,人口流动特征对农民工家庭代际关系的影响存在性别与代次差异,异地流动的男性农民工和新一代农民工与父母形成疏离型关系的可能性较低,但对女性农民工和老一代农民工的疏离型家庭代际关系具有显著正向影响。

关键词：农民工代际关系农村家庭代际团结人口流动城镇化

Simple electrode assembly engineering:Toward a multifunctional lead-acid battery

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2024年第9期96卷 536-543页

作者： Xiaojuan Cao Xiaoyu Yan Kai Zhao Le Ke xiaoyi Jiang Lingjiao Li Ning Yan Key Laboratory of Artificial Micro-and Nano-Structures of Ministry of Education School of Physics and TechnologyWuhan UniversityWuhan 430072HubeiChina Shenzhen Research Institute of Wuhan University Shenzhen 518057GuangdongChina

Electrochemical energy storage is a promising technology for the integration of renewable ***-acid battery is perhaps among the most successful commercialized systems ever since thanks to its excellent cost-effectiveness and safety *** of 165 years of development,the low energy density as well as the coupled power and energy density scaling restrain its wider application in real *** address this challenge,we optimized the configuration of conventional Pb-acid battery to integrate two gas diffusion *** novel device can work as a Pb-air battery using ambient air,showing a peak power density of 183 mW cm^(−2),which was comparable with other state-of-the-art metal-O_(2)*** can also behave as a fuel cell,simultaneously converting H_(2)and air into electricity with a peak power density of 75 mW cm^(−2).Importantly,this device showed little performance degradation after 35 h of the longevity *** work shows the exciting potential of lead battery technology and demonstrates the importance of battery architecture optimization toward improved energy storage capacity.

关键词： Lead-acid battery Decoupled electrode reaction Energy storage Discharge capacity Fuel cell

Cellular Cd^(2+)fluxes in roots confirm increased Cd availability to rice(Oryza sativa L.)induced by soil acidifications

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2024年第5期139卷 516-526页

作者： xiaoyi Sun Meng Wang Luyao Qin Lei Yu jing Wang Han Zheng Wenneng Zhou Shibao Chen State Key Laboratory of Efficient Utilization of Arid and Semi-arid Arable Land in Northern China/Institute of Agricultural Resources and Regional Planning Chinese Academy of Agricultural SciencesBeijing 100081China Guangdong Provincial Key Laboratory of Water Quality Improvement and Ecological Restoration for Watersheds School of EcologyEnvironment and ResourcesGuangdong University of TechnologyGuangzhou 510006China

Soil acidifications become one of the main causes restricting the sustainable development of agriculture and causing issues of agricultural product *** order to explore the effect of different acidification on soil cadmium(Cd)availability,soil pot culture and hydroponic(soil potting solution extraction)were applied,and non-invasive micro-test technique(NMT)was *** three different soil acidification processes were simulated,including direct acidification by adding sulfuric acid(AP1),acid rain acidification(AP2)by adding artificial simulated acid rain and excessive fertilization acidification by adding(NH_(4))_(2)SO_(4)(AP3).The results showed that for direct acidification(AP1),DTPA-Cd concentration in field soils in Liaoning(S1)and Zhejiang(S2)increased by 0.167-0.217 mg/kg and 0.181-0.346 mg/kg,respectively,compared with control *** soil pH decreased by 0.45 units in S1,the Cd content of rice stems,leaves and roots increased by 0.48 to 6.04 mg/kg and 2.58 to 12.84mg/kg,respectively,When the pH value of soil S1 and S2 decreased by 0.20 units,the average velocity of Cd^(2+)at 200μm increased by 10.03-33.11 pmol/cm~2/sec and 21.33-52.86pmol/cm^(2)/sec,respectively,and followed the order of AP3>AP2>*** summary,different acidification measures would improve the effectiveness of Cd,under the same pH reduction condition,fertilization acidification increased Cd availability most significantly.

关键词： Soil acidification Cadmium Non-invasive micro-test technique Bioavailability

Rapid prediction of flow and concentration fields in solid-liquid suspensions of slurry electrolysis tanks

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2024年第9期31卷 2006-2016页

作者： Tingting Lu Kang Li Hongliang Zhao Wei Wang Zhenhao Zhou xiaoyi Cai Fengqin Liu State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China State Key Laboratory of Intelligent Optimized Manufacturing in Mining&Metallurgy Process Beijing 102628China School of Materials Science and Engineering Lanzhou University of TechnologyLanzhou 730050China School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China

Slurry electrolysis(SE),as a hydrometallurgical process,has the characteristic of a multitank series connection,which leads to various stirring conditions and a complex solid suspension *** computational fluid dynamics(CFD),which requires high computing resources,and a combination with machine learning was proposed to construct a rapid prediction model for the liquid flow and solid concentration fields in a SE *** scientific selection of calculation samples via orthogonal experiments,a comprehensive dataset covering a wide range of conditions was established while effectively reducing the number of simulations and providing reasonable weights for each ***,a prediction model of the SE tank was constructed using the K-nearest neighbor *** results show that with the increase in levels of orthogonal experiments,the prediction accuracy of the model improved *** model established with four factors and nine levels can accurately predict the flow and concentration fields,and the regression coefficients of average velocity and solid concentration were 0.926 and 0.937,*** with traditional CFD,the response time of field information prediction in this model was reduced from 75 h to 20 s,which solves the problem of serious lag in CFD applied alone to actual production and meets real-time production control requirements.

关键词： slurry electrolysis solid-liquid suspension computational fluid dynamics K-nearest neighbor algorithm rapid prediction

仿生扑翼飞行机器人柔性翅试验研究及其理论解释

在线全文

学校读者我要写书评

暂无评论

中国机械工程 2007年第9期18卷 1028-1032页

作者：金晓怡颜景平周建华东南大学扬州大学扬州225009

以柔性翅为研究对象,在自行研制的气动力测量试验平台上进行升力试验研究,旨在为柔性翅的理论研究提供依据。试验结果表明,柔性翅能产生较之刚性翅更大的升力,说明柔性翅将更适合仿生飞行。针对翅变形对昆虫飞行高升力有贡献的试验结果... 详细信息

以柔性翅为研究对象,在自行研制的气动力测量试验平台上进行升力试验研究,旨在为柔性翅的理论研究提供依据。试验结果表明,柔性翅能产生较之刚性翅更大的升力,说明柔性翅将更适合仿生飞行。针对翅变形对昆虫飞行高升力有贡献的试验结果,给出了一种基于柔性楔形效应的升力机制的理论解释。

关键词：仿生扑翼飞行机器人柔性翅升力柔性楔形效应

家庭人口禀赋对城乡夫妻抚幼投入与分工的影响——基于西部县域调查数据的分析

在线全文

学校读者我要写书评

暂无评论

人口学刊 2022年第3期44卷 31-45页

作者：段朱清靳小怡杜巍西安交通大学公共政策与管理学院陕西西安710049

为应对人口老龄化与低生育率,国家提倡一对夫妻可以生育三个子女并将婚嫁、生育、养育、教育一体考虑,因此完善家庭抚幼功能迫在眉睫。本文基于2021年陕西N县城乡家庭专项调查数据,运用多元线性回归分析与多分类回归分析等方法,分析西... 详细信息

为应对人口老龄化与低生育率,国家提倡一对夫妻可以生育三个子女并将婚嫁、生育、养育、教育一体考虑,因此完善家庭抚幼功能迫在眉睫。本文基于2021年陕西N县城乡家庭专项调查数据,运用多元线性回归分析与多分类回归分析等方法,分析西部典型农业县中家庭人口禀赋对夫妻抚幼投入与分工的影响。研究发现城乡女性在家庭抚幼中依然占据绝对主导地位,男性参与度较差,农村男性尤甚;伴随家庭抚幼负担加重,仅妻子的抚幼投入增加,“父职”缺位明显;祖辈健康状况越好,对家庭抚幼的帮助效应越显著;作为家庭的刚性需求,抚幼功能表现出较强的稳定性,家庭养老负担的增加并未对家庭抚幼产生挤占效应;县外流动的打工经历明显削弱了夫妻的抚幼投入。研究揭示了西部县域家庭抚幼功能发挥面临的诸多阻力,为进一步发挥与完善西部县域家庭功能,须持续关注家庭内部两性分工的科学性与平等性,促进教育体系改革,提升西部地区男性受教育程度,强化其个体资源与家庭责任意识,促进就地城镇化,避免远距离流动带来的家庭离散,保障西部地区家庭抚幼功能与儿童成长权益。

关键词：家庭人口禀赋抚幼投入抚幼分工城乡差异

维普期刊数据库博看期刊

Regulation of the pore structure of carbon nanosheets based electrocatalyst for efficient polysulfides phase conversions

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2024年第4期171卷 37-46页

作者： Xiaoyang Liu jingbo Zhang Kangli Liu Shijie Zhang Rouhan Hou xiaoyi Hu Peng Zhang Guosheng Shao State Center for International Cooperation on Designer Low-Carbon&Environmental Materials(CDLCEM) School of Materials Science and EngineeringZhengzhou UniversityZhengzhou 450001China Zhengzhou Materials Genome Institute(ZMGI) Xingyang 450100China

The practical applications of lithium-sulfur(Li-S)batteries are hampered by the sluggish redox kinetics and polysulfides shuttle in the cyclic process,which leads to a series of problems including the loss of active materials and poor cycling *** this paper,the pore structures of carbon nanosheets based electrocatalysts were precisely controlled by regulating the content of water-soluble KCl *** relationship between pore structures and Li-S electrochemical behavior was studied,which demonstrates a key influence of pore structure in polysulfides phase *** the liquid-sloid redox reaction of polysulfides,the micropores and small mesopores(d20 nm)and macropores played a decisive *** a typical exhibition,the nickel-embedded carbon nanosheets(Ni-CNS)with a high content of large mesopores and macropores can aid Li-S batteries in exhibiting stable cycling performance(760.1 mAh g^(-1)at 1 C after 300 cycles)and superior rate capac-ity(847.8 mAh g^(-1)at 2 C).Furthermore,even with high sulfur loading(8 mg cm^(−2))and low electrolyte(E/S is around 6μL mg^(-1)),the high area capacity of 7.7 mAh cm^(−2)at 0.05 C could be *** work can provide a guideline for the design of the pore structure of carbon-based electrocatalysts toward high-efficiency sulfur species redox reactions,and afford a general,controllable,and simple approach to constructing high performance Li-S batteries.

关键词： Hierarchical porous carbon network Electrocatalyst Molten salt templating method Modified separators Li-S batteries

A novel mechanism of PHB2-mediated mitophagy participating in the development of Parkinson's disease

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8期19卷 1828-1834页

作者： Yongjiang Zhang Shiyi Yin Run Song xiaoyi Lai Mengmeng Shen Jiannan Wu Junqiang Yan Key Laboratory of Neuromolecular Biology The First Affiliated HospitalCollege of Clinical Medicine of Henan University of Science and TechnologyLuoyangHenan ProvinceChina Department of Neurology The First Affiliated HospitalCollege of Clinical Medicine of Henan University of Science and TechnologyLuoyangHenan ProvinceChina

Endoplasmic reticulum stress and mitochondrial dysfunction play important roles in Parkinson s disease,but the regulato ry mechanism remains ***-2(PHB2)is a newly discove red autophagy receptor in the mitochondrial inner membrane,and its role in Parkinson’s disease remains *** kinase R(PKR)-like endoplasmic reticulum kinase(PERK)is a factor that regulates cell fate during endoplasmic reticulum *** is regulated by PERK and is a target of the unfolded protein *** is unclear whether PERK regulates PHB2-mediated mitophagy thro ugh *** this study,we established a 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine(MPTP)-induced mouse model of Parkinson’s *** used adeno-associated virus to knockdown PHB2 *** res ults showed that loss of dopaminergic neurons and motor deficits were aggravated in the MPTP-induced mouse model of Parkinson’s *** rexpression of PHB2 inhibited these *** also established a 1-methyl-4-phenylpyridine(MPP+)-induced SH-SY5Y cell model of Parkinson’s *** found that ove rexpression of Parkin increased co-localization of PHB2 and microtubule-associated protein 1 light chain 3,and promoted *** addition,MPP+regulated Parkin involvement in PHB2-mediated mitophagy through phosphorylation of *** findings suggest that PHB2 participates in the development of Parkinson’s disease by intera cting with endoplasmic reticulum stress and Parkin.

关键词： endoplasmic reticulum dopaminergic neuron microtubule-associated protein 1 light chain 3 mitophagy oxidative stress Parkin Parkinson’s disease PKR-like endoplasmic reticulum kinase reactive oxygen species prohibitin-2