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Digital Revolution and Job Quality of Lower Class Workers: Quasi-experimental Evidence from the Broadband China Program

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China & World Economy 2024年第4期32卷 146-178页

作者： Xiumei Wang ye jiang Famin Yi School of Business Fuyang Normal UniversityChina Department of Economics Dickinson CollegeUSA School of Economics and Management South China Agricultural UniversityChina

This study examines the impact of the digital revolution on the job quality of workers with a specific focus on those at the lowest end of the spectrum in China's domestic labor market. Leveraging exogenous timing variations that result from the implementation of the Broadband China Program across different cities, it provides quasi-experimental evidence concerning the effects of the digital revolution on the job quality of lower class workers, particularly rural–urban migrant workers. Using data from China Migrants Dynamic Survey, this study reveals that migrants' comprehensive job quality index increased by 0.0138 (5.33 percent), and its component indices experienced positive effects after the Broadband China Program was implemented. This study also investigates heterogeneous policy treatment effects among workers with diverse demographic and occupational characteristics. Underlying mechanisms are considered, including positive macroeconomic shocks, increased social interactions, and Internet use. In particular, migrants' attitudes toward local settlement became more positive, suggesting that the positive effects of the digital revolution on livelihood lasted for some time. Taking China as an example, this study contributes valuable empirical evidence of how the digital revolution can affect lower class workers' employment or living conditions in a developing country. Related policy implications are also considered.

关键词： Broadband China Program digital revolution job quality lower clas workers rural-urban migrants

A novel integrated microfluidic chip for on-demand electrostatic droplet charging and sorting

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Bio-Design and Manufacturing 2024年第1期7卷 31-42页

作者： Jinhui Yao Chunhua He Jianxin Wang Canfeng Yang ye jiang Zhiyong Liu Guanglan Liao Tielin Shi State Key Laboratory of Intelligent Manufacturing Equipment and Technology Huazhong University of Science and TechnologyWuhan 430074China

On-demand droplet sorting is extensively applied for the efficient manipulation and genome-wide analysis of individual ***,state-of-the-art microfluidic chips for droplet sorting still suffer from low sorting speeds,sample loss,and labor-intensive preparation ***,we demonstrate the development of a novel microfluidic chip that integrates droplet generation,on-demand electrostatic droplet charging,and high-throughput *** charging electrode is a copper wire buried above the nozzle of the microchannel,and the deflecting electrode is the phosphate buffered saline in the microchannel,which greatly simplifies the structure and fabrication process of the ***,this chip is capable of high-frequency droplet generation and sorting,with a frequency of 11.757 kHz in the drop *** chip completes the selective charging process via electrostatic induction during droplet ***-demand charged microdroplets can arbitrarilymove to specific exit channels in a three-dimensional(3D)-deflected electric field,which can be controlled according to user requirements,and the flux of droplet deflection is thereby significantly ***,a lossless modification strategy is presented to improve the accuracy of droplet deflection or harvest rate from 97.49% to 99.38% by monitoring the frequency of droplet generation in real time and feeding it back to the charging *** chip has great potential for quantitative processing and analysis of single cells for elucidating cell-to-cell variations.

关键词： Copper wire Droplet generation Droplet sorting Microfluidic chips On-demand charging

Expression and significance of pigment epithelium-derived factor and vascular endothelial growth factor in colorectal adenoma and cancer

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World Journal of Gastrointestinal Oncology 2024年第3期16卷 670-686页

作者： ye Yang Wu Wen Feng-Lin Chen Ying-Jie Zhang Xiao-Cong Liu Xiao-Yan Yang Shan-Shan Hu ye jiang Jing Yuan Digestive Diseases Chengdu Qingbaijiang District People's HospitalChengdu 610300Sichuan ProvinceChina Digestive Diseases Chengdu Second People’s HospitalChengdu 610000Sichuan ProvinceChina Graduate School Chengdu Medical CollegeChengdu 610000Sichuan ProvinceChina

BACKGROUND The incidence and mortality of colorectal cancer(CRC)are among the highest in the world,and its occurrence and development are closely related to tumor *** the balance between pigment epithelium-derived factors(PEDF)that inhibit angiogenesis and vascular endothelial growth factors(VEGF)that stimulate angiogenesis is broken,angiogenesis is out of control,resulting in tumor ***,it is very necessary to find more therapeutic targets for CRC for early intervention and later *** To investigate the expression and significance of PEDF,VEGF,and CD31-stained microvessel density values(CD31-MVD)in normal colorectal mucosa,adenoma,and *** In this case-control study,we collected archived wax blocks of specimens from the Digestive Endoscopy Center and the General Surgery Department of Chengdu Second People's Hospital from April 2022 to October *** cases of specimen wax blocks were selected as normal intestinal mucosa confirmed by electronic colonoscopy and concurrent biopsy(normal control group),50 cases of specimen wax blocks were selected as colorectal adenoma confirmed by electronic colonoscopy and pathological biopsy(adenoma group),and 50 cases of specimen wax blocks were selected as CRC confirmed by postoperative pathological biopsy after inpatient operation of general surgery(CRC group).An immunohistochemical staining experiment was carried out to detect PEDF and VEGF expression in three groups of specimens,analyze their differences,study the relationship between the two and clinicopathological factors in CRC group,record CD31-MVD in the three groups,and analyze the correlation of PEDF,VEGF,and CD31-MVD in the colorectal adenoma group and the CRC *** F test or adjusted F test is used to analyze measurement data ***-Wallis rank sum test was used between groups for ranked *** chi-square test,adjusted chi-square test,or Fisher's exact test were used to compare the rates betwe

关键词： Pigment epithelium-derived factors Vascular endothelial growth factor Microvessel density Colorectal adenoma Colorectal cancer Targeted therapy

By the Liupan Mountains,Alongsidethe Qingshui River

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China Book International 2024年第2期 113-115页

作者： jiang ye 不详

The author shares his exploration of the Hexi Corridor,the banks of the yellow River,and the regions north and south of the Tianshan Mountains-encompassing historical sites,local customs,and folk traditions-within his personal experience of the long and splendid civilization of Northwestern China,offering his respect to the generations who have dedicated and toiled in this land.

关键词： Tianshan offering Mountains

Targeted metabolomics study of fatty-acid metabolism in lean metabolic-associated fatty liver disease patients

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World Journal of Gastroenterology 2024年第27期30卷 3290-3303页

作者： Pei-Qi Sun Yi-Fu Yuan Qin Cao Xiao-Yan Chen Yuan-ye jiang Wen-Min Dong Li-Li Guo Department of Gastroenterology Putuo HospitalShanghai University of Traditional Chinese MedicineShanghai 200062China Department of Pharmacy Shanghai Pudong HospitalFudan University Pudong Medical CenterShanghai 201399China Central Laboratory Shanghai Chest HospitalShanghai Jiao Tong University School of MedicineShanghai 200030China

BACKGROUND The annual incidence of metabolic-associated fatty liver disease(MAFLD)in China has been increasing and is often overlooked owing to its insidious *** 50%of the patients have a normal weight or are not *** are said to have lean-type MAFLD,and few studies of such patients are *** MAFLD is associated with abnormal lipid metabolism,lipid-targeted metabolomics was used in this study to provide experimental evidence for early diagnosis and *** and analyze metabolic ***-Q-Orbitrap/MS content determination was used to determine serum palmitic acid(PA),oleic acid(OA),linoleic acid(LA),and arachidonic acid(AA)levels in lean-type MAFLD *** Urea nitrogen and uric acid levels were higher in lean-type MAFLD patients than in healthy individuals(P*** levels of PA,OA,LA,and AA were significantly increased compared with healthy *** The metabolic profiles of lean-type MAFLD patients and healthy participants differed significantly,yielding 65 identified ***,OA,LA,and AA exhibited the most significant changes,offering valuable clinical guidance for prevention and treatment of lean-type MAFLD.

关键词： Lean-type metabolic-associated fatty liver disease Targeted serum metabolomics Fatty acids Principal component analysis Orthogonal partial least squares-discriminant analysis

法治化营商环境背景下数据要素流通交易的困境纾解

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China Legal Science 2024年第4期12卷 29-59页

作者：姜野 Hebei Normal University Commercial and Economic Law School of China University of Political Science and Law

在数字经济时代,数据要素合规高效流通交易构成法治化营商环境建设的关键环节,有助于推进新质生产力发展。在实践中,我国逐渐总结出政策引导先行先试、激活数据要素商业价值、活跃数据要素场内交易等先进经验。然而,数据要素流通交易仍... 详细信息

在数字经济时代,数据要素合规高效流通交易构成法治化营商环境建设的关键环节,有助于推进新质生产力发展。在实践中,我国逐渐总结出政策引导先行先试、激活数据要素商业价值、活跃数据要素场内交易等先进经验。然而,数据要素流通交易仍遇到数据要素确权、定价、存储和交易等方面的瓶颈,一定程度上影响营商环境建设。为此,有必要重塑数据要素的价格形成机制,完善数据要素收益再分配机制,通过政企合作增强数据保障,不断健全数据要素市场流通交易合规制度,充分发挥我国海量数据规模与丰富应用场景优势。

关键词：营商环境场内交易政企合作再分配机制要素收益价格形成机制海量数据数据保障

非饱和土地基中双层波阻板屏障对S波的隔离效应研究

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地震工程学报 2024年第5期46卷 1126-1141页

作者：江烨马强青海大学土木工程学院青海西宁810016 青海省建筑节能材料与工程安全重点实验室青海西宁810016

在传统波阻板的基础上,将屏障隔振改进为相同厚度的双层波阻板。基于非饱和多孔介质和弹性介质中的波动理论,研究非饱和土地基中双层波阻板对S波的隔离效应。根据Helmholtz原理,获得S波入射下非饱和土地基中设置双层波阻板后地表竖向位... 详细信息

在传统波阻板的基础上,将屏障隔振改进为相同厚度的双层波阻板。基于非饱和多孔介质和弹性介质中的波动理论,研究非饱和土地基中双层波阻板对S波的隔离效应。根据Helmholtz原理,获得S波入射下非饱和土地基中设置双层波阻板后地表竖向位移解答。首先研究双层波阻板的材料参数对其隔振性能的影响规律,研究发现通过调控双层波阻板的密度和剪切模量能够使双层波阻板隔振屏障获得最优隔振效果;然后对比双层波阻板与相同材质的单层均质波阻板的隔振效果,并分析入射角、频率、饱和度、波阻板的厚度和埋深等物理力学参数对其隔振性能的影响规律。研究结果表明:同一厚度的波阻板隔振体系中,双层波阻板的隔振效率比同等材质的单层波阻板分别提高了49.18%和42.59%;双层波阻板对低频、中频和高频的环境振动均有较好的隔振效果。

关键词：双层波阻板环境振动隔振效果非饱和土振幅衰减系数

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血清miR-499与急性冠脉综合征患者冠状动脉病变严重程度的相关性分析

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上海交通大学学报（医学版） 2024年第4期44卷 469-473页

作者：唐冬娟江来江叶上海交通大学医学院附属新华医院麻醉与重症医学科上海200092

目的·探讨急性冠脉综合征(acute coronary syndrome,ACS)患者血清中miR-499表达水平对冠状动脉病变严重程度的预测价值。方法·纳入就诊于上海交通大学医学院附属新华医院的ACS患者74例,根据Gensini评分将患者分为轻度组(30例)、中度组... 详细信息

目的·探讨急性冠脉综合征(acute coronary syndrome,ACS)患者血清中miR-499表达水平对冠状动脉病变严重程度的预测价值。方法·纳入就诊于上海交通大学医学院附属新华医院的ACS患者74例,根据Gensini评分将患者分为轻度组(30例)、中度组(21例)及重度组(23例)。荧光实时定量聚合酶链反应(real-time quantitative polymerase chain reaction,qPCR)技术检测血清miR-499的表达量,同时检测肌钙蛋白(cTnI)、肌酸激酶同工酶(CK-MB)、肌红蛋白(Mb)、脑钠肽(BNP)、左心室射血分数(LVEF)等实验室指标。采用Spearman相关分析评估miR-499表达水平与Gensini评分、冠状动脉病变血管支数的相关性。受试者操作特征(receiver operating characteristic,ROC)曲线分析miR-499对冠状动脉病变严重程度的评估价值。结果·miR-499的表达水平随着冠状动脉病变程度的加重呈上升趋势,组间差异有统计学意义(P=0.000)。miR-499表达水平与Gensini评分、cTnI水平呈正相关(r值分别为0.331、0.143,P0.05);Gensini评分与cTnI、LVEF均无相关性(P>0.05)。ROC曲线分析结果显示,miR-499评估冠状动脉病变严重程度的AUC为0.802(95%CI 0.698~0.906),灵敏度为65.2%,特异度为80.4%。miR-499表达水平随着冠状动脉病变支数的增多呈升高趋势,且与冠状动脉病变支数呈正相关(r=0.368,P<0.05)。结论·ACS患者血清中miR-499表达水平与冠状动脉病变严重程度及病变支数相关,对冠状动脉病变严重程度具有一定评估价值。

关键词： miR-499 急性冠脉综合征生物标志物冠状动脉狭窄

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绚烂的意象——张举毅的水彩画艺术

美术 2024年第9期 149-151页

作者：王远蒋烨中南大学建筑与艺术学院

作为20世纪湖湘水彩画的重要代表画家之一,张举毅的水彩作品情韵隽永、意趣盎然,呈现出畅快之感,他的画风在笔耕不辍的勤勉中形成了将中国传统写意观与西方印象派相结合的意象特征。本文着重从张举毅意象水彩的缘起、审美构建以及成果... 详细信息

作为20世纪湖湘水彩画的重要代表画家之一,张举毅的水彩作品情韵隽永、意趣盎然,呈现出畅快之感,他的画风在笔耕不辍的勤勉中形成了将中国传统写意观与西方印象派相结合的意象特征。本文着重从张举毅意象水彩的缘起、审美构建以及成果三个方面阐述其水彩艺术的绚烂之美,以艺术哲学视域赏析作品的民族性与艺术性,同时回望张举毅水彩画对20世纪湖湘水彩发展的重要贡献。

关键词：张举毅湖湘水彩意象水彩水彩画绚烂美