检索结果-南通市图书馆

Heavy metals in road-deposited sediment and runoff in urban and intercity expressways

在线全文

学校读者我要写书评

暂无评论

Transportation Safety and Environment 2022年第1期4卷 40-48页

作者： Shuohan Gao xinjun Wang Hua Li Yaping Kong Jiding Chen zheng Chen Research Center for Environmental Protection and Water and Soil Conservation China Academy of Transportation Sciences240 HuixinliChaoyang DistrictBeijing 100029China Department of Environmental Science Xi’an Jiaotong-Liverpool UniversitySuzhou 215123China

Road-deposited sediments(RDS)accumulated on road surfaces are an important environmental medium that often provides transport for heavy *** order to understand the characteristics of heavy metals in RDS,we investigated the size distribution and heavy metal(***,Cr,Cu,Ni,Pb and Zn)concentrations in RDS and road runoff in typical expressways of suburban and rural area in *** results demonstrated that RDS particles from all impervious expressway surfaces were predominantly coarse particles(>250μm,58.4%±3.8%)and the RDS on all expressways contained more heavy metals than background ***,the concentrations of Cd,Cr,Cu,Ni,Pb and Zn increased with traffic volume,suggesting that these heavy metals are mainly derived from traffic ***,it is found that although heavy metals were concentrated in fine grain fractions,the total loading is highest for the coarsest particles due to their large mass ***,it reveals that the heavy metal concentrations in road runoff of suburban expressway are higher than that in urban *** findings enhance the understanding of expressway pollution,and imply that for controlling runoff pollution from RDS,transportation agencies should be concerned with both fine and coarse particles and take cleaning methods into account.

关键词： heavy metal road-deposited sediment runoff expressway pollution

Enhancing the performance of organic solar cells by modification of cathode with a self-assembled monolayer of aromatic organophosphonic acid

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2023年第4期34卷 526-530页

作者： Wenlong Liu Hao Lu Yan Zhang Hao Huang Xinming zheng Yahui Liu Youzhi Wu xinjun Xu School of Materials Science and Engineering Lanzhou University of TechnologyLanzhou 730050China Key Laboratory of Energy Conversion and Storage Materials College of ChemistryBeijing Normal UniversityBeijing 100875China College of Textiles&Clothing State Key Laboratory of Bio-fibers and Eco-textilesQingdao UniversityQingdao 266071China

We use a single-molecule self-assembled layer of an aromatic organophosphonic acid(2PACz) to modify the cathode interface layer in inverted organic solar cells(OSCs). The modified OSCs not only have an obvious improvement in power conversion efficiency(PCE), but also demonstrate greatly enhanced air stability. Ultraviolet photoelectron spectroscopy shows that the work function of cathode interlayer after modification by 2PACz is more suitable for electron extraction. In addition, the surface energy is reduced without affecting the film deposition, which will be beneficial to reduce the interfacial traps. As a result,the PCE of OSCs based on the PBDB-T:IT-M system is increased, and its stability in air is greatly improved(remaining 88% of its initial PCE after 555 h in air). Therefore, we provide a new strategy for constructing high-performance non-fullerene OSCs with enhanced air stability.

关键词： Organic solar cells Interface modification Self-assembled monolayer Stability PCE

在线全文

学校读者我要写书评

暂无评论

续筋接骨液促进急性肌腱损伤修复的机制研究

中国中医骨伤科杂志 2024年第6期32卷 25-29页

作者：郑含笑谢先敏王鹏李梓宸谢心军湖南中医药大学第一中医临床学院长沙410208 湖南中医药大学第一附属医院湖北省中医院

目的:采用横行贯通切断大鼠跟腱纵轴制作急性肌腱损伤模型,用续筋接骨液灌胃治疗,探讨续筋接骨液影响肌腱愈合的作用机制。方法:将45只SD大鼠随机分为5组,分别为模型组、假手术组、续筋接骨液低、中、高剂量组,每组9只。假手术组切开皮... 详细信息

目的:采用横行贯通切断大鼠跟腱纵轴制作急性肌腱损伤模型,用续筋接骨液灌胃治疗,探讨续筋接骨液影响肌腱愈合的作用机制。方法:将45只SD大鼠随机分为5组,分别为模型组、假手术组、续筋接骨液低、中、高剂量组,每组9只。假手术组切开皮肤后直接缝合皮肤,其余4组建立跟腱损伤模型并手术修复肌腱缝合皮肤。续筋接骨液低、中、高剂量组分别用3.12,6.25,12.50 mL/kg灌胃干预,模型组与假手术组用等量的生理盐水灌胃干预。4周后观察各组大鼠肌腱愈合情况,ELISA法检测各组大鼠血清中转化生长因子β1(TGF-β1)和碱性成纤维细胞生长因子(bFGF)的表达情况;RT-PCR法检测肌腱组织中磷脂酰肌醇-3激酶(PI3K)、蛋白激酶B(Akt)、雷帕霉素靶蛋白(mTOR)、TGF-β1及bFGF的表达水平。结果:与模型组比较,其余4组大鼠血清中TGF-β1和bFGF表达水平均降低,差异有统计学意义(P0.05)。与续筋接骨液高剂量组比较,假手术组大鼠血清中TGF-β1和bFGF表达水平降低,差异有统计学意义(P<0.05);肌腱组织中TGF-β1、bFGF、PI3K、Akt及mTOR表达水平降低,差异有统计学意义(P<0.05)。结论:续筋接骨液在大鼠肌腱愈合过程中有促进作用,并可以减少肌腱粘连发生,其作用机制可能与其抑制TGFβ1、bFGF及PI3K-Akt-mTOR通路表达有关。

关键词：续筋接骨液肌腱损伤碱性成纤维细胞生长因子转化生长因子β1 磷脂酰肌醇3激酶/蛋白激酶B信号通路

在线全文

学校读者我要写书评

暂无评论

低渗透油田水淹井治理技术研究与现场应用

石油化工应用 2014年第3期33卷 36-39页

作者：梁晓芳景文杰郑新军赵荣奎郝颖平董青春冯小兵中国石油长庆油田分公司第三采油厂宁夏银川750006

本文立足长庆油田第三采油厂采用注水开发历经40年后的油田调查结果,针对储层裂缝和局部高渗带引起注入水单向突进,造成油井水淹的严重问题,通过油井堵水技术,深部调剖技术,以及机械堵水技术的研究和实施效果的分析,提出了水淹井治理技... 详细信息

本文立足长庆油田第三采油厂采用注水开发历经40年后的油田调查结果,针对储层裂缝和局部高渗带引起注入水单向突进,造成油井水淹的严重问题,通过油井堵水技术,深部调剖技术,以及机械堵水技术的研究和实施效果的分析,提出了水淹井治理技术在采油三厂的选择条件。结合实施效果,对双开关找堵水一体化工艺技术在低渗透油田的具体应用进行了阐述,为水淹井治理技术的进一步实施提出了参考建议。

关键词：深部调剖油井堵水机械堵水选择条件

狼疮肾炎合并Libman-Sacks心内膜炎男性1例

在线全文

学校读者我要写书评

暂无评论

中华心血管病杂志 2024年第8期52卷 932-934页

作者：罗静杜歆茹徐倩云王妍华胡楠吕晓虹蒲丹雷新军郑幸龙余晓洋何岚西安交通大学第一附属医院风湿免疫科西安710061 西安交通大学第一附属医院心血管内科西安710061 西安交通大学第一附属医院心血管外科西安710061 西安交通大学第一附属医院肾内科西安710061

系统性红斑狼疮是一种致病性自身抗体和免疫复合物形成并介导器官、组织损伤的慢性自身免疫病。狼疮累及心脏瓣膜可产生非感染性疣状赘生物, 称为Libman-Sacks心内膜炎。Libman-Sacks心内膜炎的诊断及治疗方案目前尚无指南推荐。该文报... 详细信息

系统性红斑狼疮是一种致病性自身抗体和免疫复合物形成并介导器官、组织损伤的慢性自身免疫病。狼疮累及心脏瓣膜可产生非感染性疣状赘生物, 称为Libman-Sacks心内膜炎。Libman-Sacks心内膜炎的诊断及治疗方案目前尚无指南推荐。该文报道狼疮肾炎合并Libman-Sacks心内膜炎1例, 为Libman-Sacks的诊治提供一定的经验及依据。

关键词： Libman-Sacks心内膜炎系统性红斑狼疮狼疮肾炎瓣膜置换术

Durability of Hepatitis B surface antigen seroclearance in patients experienced nucleoside analogs or interferon monotherapy: A real-world data from Electronic Health Record

在线全文

学校读者我要写书评

暂无评论

Genes & Diseases 2023年第3期10卷 1019-1028页

作者： Zongqi Shi Huizhi zheng Miaomiao Han Jieli Hu Yuan Hu Xiaosong Li Wenyan Zhu xinjun He Haijun Deng Quanxin Long Ailong Huang Key Laboratory of Molecular Biology on Infectious Diseases Ministry of EducationThe Second Affiliated Hospital of Chongqing Medical UniversityChongqing 400010China Medical Data Research Institute of Chongqing Medical University Chongqing 400010China YiduCloud(Beijing)Technology Co. LtdBeijing 100089China

Little is known about the difference in durability of HBsAg seroclearance induced by nucleoside analogs (NAs) or by interferon (IFN). A real-world, retrospective cohort study was conducted. Patients were assigned into two groups: NAs monotherapy-induced HBsAg seroclearance subjects and IFN monotherapy induced-HBsAg seroclearance subjects. A total of 198 subjects, comprised by 168 NAs monotherapy-induced and 30 IFN monotherapy-induced, who achieved HBsAg seroclearance were included in this study. The one-year probabilities of confirmed HBsAg seroclearance were significantly different in patients with NAs monotherapy and IFN monotherapy (0.960 (with 95% CI 0.922–0.999) vs. 0.691 (with 95% CI 0.523–0.913), log-rank-P = 4.04e-4). 73.3% (11 of 15) HBsAg recurrence occurred within one year after HBsAg seroclearance. The one-year probabilities of confirmed HBsAg seroclearance were higher in IFN monotherapy patients with anti-HBs than in IFN monotherapy patients without anti-HBs (0.839 (with 95% CI 0.657–1.000) vs. 0.489 (with 95% CI 0.251–0.953), log-rank test, P = 0.024). Our study thus provided novel insights into the durability of HBsAg seroclearance induced by NAs or IFN monotherapy. In particular, the HBsAg seroreversion rate was relatively high in IFN monotherapy subjects. The presence of anti-HBs was significantly correlated with a longer durability of functional cure induced by IFN treatment. And one-year follow-up in HBsAg seroclearance achieved individuals is proper for averting HBsAg seroreversion and other liver disease.

关键词： anti-HBs Chronic hepatitis B Infection Clinical outcomes after HBsAg seroclearance Durability of HBsAg seroclearance Interferon monotherapy Nucleosi de analogs monotherapy

Generation of tail-free short pulses using high-pressure CO_(2) laser

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

Chinese Optics Letters 2022年第5期20卷 14-18页

作者： Yue Lu Ziren Zhu Jinzhou Bai xinjun Su Rongqing Tan Jinghan Ye Yijun zheng Aerospace Information Research Institute Chinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China Science and Technology on Particle Transport and Separation Laboratory Tianjin 300180China

The spectral linewidth of a transversely excited pulsed CO_(2) laser is broadened at high working *** phenomenon causes a decrease in the upper-level lifetime such that the pulse width is significantly *** the tail part of CO_(2) laser pulses owns a non-negligible proportion of total energy,it has minor effects during the interaction process between photons and materials due to its low ***,it is of great significance to yield the tail part and generate a narrow pulse in most *** this study,a continuously tunable pulsed CO_(2) laser with a low nitrogen proportion in the mixture is developed to generate tail-free short pulses;a minimum pulse width of 30.60 ns with a maximum pulse energy of 481 mJ is synchronously achieved at a pressure of 7 atm,and the estimated peak power is above 15 MW.A numerical simulation is also conducted for comparison with the experimental *** contribution of the spectral gain toward the compression of the pulse width is discussed in the last section of this paper.

关键词： short pulse continuous tuning pulse compression

Retirement Shock and Urban Household Consumption:An Empirical Study Based on the Breakpoint Regression Design

在线全文

学校读者我要写书评

暂无评论

Retirement Shock and Urban Household Consumption:An Empirica...

作者： zheng Chao WANG xinjun Shandong University

Based on the data of China Health and Pension Tracking Survey and the breakpoint regression design,this paper conducts a study of the impact of retirement shock on household consumption in *** results show that retirement can significantly reduce household non-durable goods consumption by 31.2%.After removing work-related consumption,home food consumption and expenditures on leisure,culture,education and entertainment,the other non-durable goods consumption has not decreased *** retirement shock leads to a significant change on the household consumption *** makes a significant increase in health care spending,and a significant increase in the proportion of non-basic consumption,which helps to optimize the consumption *** results of further research indicate that retirement shock has significant heterogeneous effects on households with different levels of consumption and different consumption *** impact of retirement shock on the families at the left end of the distribution of health care consumption and the families at the right end of the distribution of non-basic consumption is even more ***,it is recommended to formulate a more robust social security system,promote the upgrading of the consumption structure of the elderly,and meet the multi-level material and cultural consumption needs of the elderly.

关键词： retirement shock household consumption aging breakpoint regression design

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

面向多设备协同场景的实时视频流分析系统

中国科学：信息科学 2023年第1期53卷 46-65页

作者：杨铮董亮蔡新军清华大学软件学院北京100084

实时视频流分析在智能监控、智能制造、自动驾驶等场景中具有重要价值,然而其存在计算负载高、带宽需求大和延迟要求严格等特点,难以通过传统的本地计算模式或者云计算模式进行部署.近年兴起的边缘计算范式,将复杂的计算任务从终端设备... 详细信息

实时视频流分析在智能监控、智能制造、自动驾驶等场景中具有重要价值,然而其存在计算负载高、带宽需求大和延迟要求严格等特点,难以通过传统的本地计算模式或者云计算模式进行部署.近年兴起的边缘计算范式,将复杂的计算任务从终端设备上传到物理临近的边缘服务器上,能够有效解决设备层面的部署问题.然而,例如无人机编队飞行、车队自动驾驶和多机器人协同等不断涌现的多设备协同场景,新增了系统层面的综合性能要求,包括智能分析的实时准确率、设备之间的性能一致性和系统容纳的设备数量上限.当前的边缘计算范式对多设备协同场景的优化尚显不足,未能有效解决设备之间对上传带宽和服务器算力的竞争问题,所以难以满足这类场景的要求.本文设计了MASSIVE系统,能够在多设备协同场景中,全面提升实时视频分析的综合性能.首先,MASSIVE系统提出了适合多设备协同场景中度量视频流分析系统综合性能的评价体系.其次,MASSIVE系统设计了帕累托改进调度器来计算帕累托最优的系统调度策略,使得系统在3个维度上同时取得了相比已有系统更好的性能表现.最后,MASSIVE设计了虚拟流量整形器来保证各个设备在无线网络中按照调度策略上传视频流数据.实验结果表明,MASSIVE在多种典型的视频分析任务中,相比于当前的代表性系统,至少达到了122.7%的实时准确率、1.8倍的系统容量和更好的系统一致性,并达到了帕累托最优.

关键词：实时视频流分析边缘计算多设备协同多目标优化帕累托最优