检索结果-南通市图书馆

钢渣用量对碱激发钢渣-矿渣基灌浆材料性能的影响

在线全文

学校读者我要写书评

暂无评论

新型建筑材料 2017年第8期44卷 10-13页

作者：孙幸福彭小芹张广智王淑萍曾路重庆大学材料科学与工程学院重庆400045

基于碱激发胶凝材料的原理,以钢渣-矿渣为主要原材料,制备了一种新型绿色灌浆材料。在固定水玻璃模数、碱当量(10%或12%)、水固比、外加剂掺量的条件下,研究了钢渣用量对钢渣-矿渣基灌浆材料流动性、凝结时间、固结强度和干燥收缩等性... 详细信息

基于碱激发胶凝材料的原理,以钢渣-矿渣为主要原材料,制备了一种新型绿色灌浆材料。在固定水玻璃模数、碱当量(10%或12%)、水固比、外加剂掺量的条件下,研究了钢渣用量对钢渣-矿渣基灌浆材料流动性、凝结时间、固结强度和干燥收缩等性能的影响。试验结果表明:当碱当量为12%、钢渣用量为30%时,灌浆料的初始流动度最大为290 mm,30 min流动度保留值最小约148 mm;当碱当量为12%、钢渣用量为40%时,灌浆料的凝结时间最短为91 min;当碱当量为10%、钢渣用量为40%时,固结强度最大为54.6 MPa;钢渣用量在30%~70%时,增加钢渣用量能显著改善其干燥收缩性能。

关键词：碱激发钢渣矿渣灌浆材料性能

在线全文

学校读者我要写书评

暂无评论

水化硅酸钙超细粉体微观结构分析

沈阳建筑大学学报（自然科学版） 2008年第5期24卷 823-827,836页

作者：彭小芹杨巧黄滔许国伟重庆大学材料科学与工程学院重庆400045

目的研究水热合成水化硅酸钙超细粉体的微观结构，扩充对非结晶态水化硅酸钙的微观结构的认识．方法对用不同硅质原料经水热反应制备的水化硅酸钙粉体，采用XRD、DSc／TG、SEM、TEM等测试手段研究其微观结构．结果经XRD以及DSC／TG分析... 详细信息

目的研究水热合成水化硅酸钙超细粉体的微观结构，扩充对非结晶态水化硅酸钙的微观结构的认识．方法对用不同硅质原料经水热反应制备的水化硅酸钙粉体，采用XRD、DSc／TG、SEM、TEM等测试手段研究其微观结构．结果经XRD以及DSC／TG分析，粉体的水化产物主要为弱结晶态的CASH（B）以及类似硬硅钙石的C—S—H凝胶等．SEM观察到粉体为粒径20um左右、分布均匀的颗粒．不同硅质原料制得的粉体在TEM电镜下呈现不同的微观形貌：以硅藻土为硅质原料、钙硅摩尔比为1制得的粉体由50nm左右的球状粒子连接成链状；而以石英砂作为硅质原料、／2（Ca）／n（Si）为0．95制得的粉体为针状纤维，直径为10～20nm，交错叠加在一起．结论水化硅酸钙超细粉体呈现纤维絮状且结晶不良，硅质原料中[SiO4]^4-的聚合结构对反应程度以及反应产物的形貌有较大影响．

关键词：水化硅酸钙超细粉体微观结构 [SiO4]^4- 聚合结构

在线全文

学校读者我要写书评

暂无评论

蔬菜穴盘育苗精量播种机研究

中国农机化学报 2020年第2期41卷 13-18页

作者：杨昌敏庄文化徐一唐波魏鼎才彭晓琴四川省农业机械研究设计院成都市610066 四川大学水利水电学院成都市610066

针对小粒径蔬菜种子穴盘育苗播种精度差、效率低等问题,测试三种蔬菜种子的形状尺寸、千粒重、休止角、孔隙度,设计滚筒直径,吸孔大小、孔型、排列等关键结构参数,研制一种穴盘育苗精量播种机。该机采用气力式滚筒播种,步进电机加同步... 详细信息

针对小粒径蔬菜种子穴盘育苗播种精度差、效率低等问题,测试三种蔬菜种子的形状尺寸、千粒重、休止角、孔隙度,设计滚筒直径,吸孔大小、孔型、排列等关键结构参数,研制一种穴盘育苗精量播种机。该机采用气力式滚筒播种,步进电机加同步带传动,提高播种效率和精度。针对试制的播种机,以油菜种子为试验对象,选择真空度、气室正压力和滚筒转速三因素做正交试验,并对试验结果进行极差和方差分析。试验结果表明:在真空度4.0 kPa,气室正压力3.0 kPa,滚筒转速14 r/min时,播种机单粒率94.06%,重播率3.11%,漏播率2.83%,满足穴盘育苗精量播种的精度和效率要求。

关键词：蔬菜种子物理特性排种器穴盘育苗精量播种

基于“雁阵效应”的团队建设在临床科室耗材管理的应用研究

在线全文

学校读者我要写书评

暂无评论

现代医院 2022年第7期22卷 1068-1070页

作者：陈晓丽黎清彭小勤东莞市第八人民医院//东莞市儿童医院广东东莞523325

目的探讨“雁阵效应”的团队建设在临床科室耗材管理的应用研究。方法根据耗材管理方法将我院骨关节科不同时期分为观察组和对照组,对照组使用传统耗材管理模式;观察组给予“雁阵效应”的团队建设联合“ABC”分类法对临床科室耗材进行管... 详细信息

目的探讨“雁阵效应”的团队建设在临床科室耗材管理的应用研究。方法根据耗材管理方法将我院骨关节科不同时期分为观察组和对照组,对照组使用传统耗材管理模式;观察组给予“雁阵效应”的团队建设联合“ABC”分类法对临床科室耗材进行管理,并与传统耗材管理模式进行比较,评价及分析“雁阵效应”的团队建设联合“ABC”分类法对临床科室耗材进行科学管理,提升管理效率,节约医院运行成本的效果。结果观察组在科学化管理医用耗材,提升管理效率,节约医院运行成本的效果明显优于对照组(P<0.05)。结论“雁阵效应”的团队建设联合“ABC”分类法对临床科室耗材进行管理,有助于提高管理效率及护理人员的自我满意度,降低科室耗材成本。

关键词：雁阵效应团队建设 ABC分类法科室耗材管理

外周血EOS、IL-17A、TNF-α、VEGF与小儿肺炎支原体感染伴喘息的相关性分析

在线全文

学校读者我要写书评

暂无评论

国际检验医学杂志 2024年第10期45卷 1188-1192页

作者：卢太苓彭效芹孙逊徐州市儿童医院呼吸内二科江苏徐州272000

目的探究外周血嗜酸性粒细胞(EOS)、白细胞介素-17A(IL-17A)、肿瘤坏死因子-α(TNF-α)、血管内皮生长因子(VEGF)与小儿肺炎支原体感染伴喘息的相关性。方法选取2022年1月至2023年5月该院诊治的小儿肺炎支原体感染患儿98例为研究组,... 详细信息

目的探究外周血嗜酸性粒细胞(EOS)、白细胞介素-17A(IL-17A)、肿瘤坏死因子-α(TNF-α)、血管内皮生长因子(VEGF)与小儿肺炎支原体感染伴喘息的相关性。方法选取2022年1月至2023年5月该院诊治的小儿肺炎支原体感染患儿98例为研究组,研究组根据是否伴喘息将其分为喘息组(32例)和非喘息组(66例),另选取同期行纤维支气管镜检查非支原体感染,并无喘息的大叶性肺炎患儿30例作为对照组。比较不同组别外周血EOS、IL-17A、TNF-α、VEGF水平差异,并分析这4项指标与小儿肺炎支原体感染伴喘息的相关性。结果研究组外周血EOS、IL-17A、TNF-α、VEGF水平均显著高于对照组,差异有统计学意义(P<0.05)。3组外周血EOS、IL-17A、TNF-α、VEGF水平比较,差异有统计学意义(P<0.05),具体为喘息组外周血EOS、IL-17A、TNF-α、VEGF水平显著高于非喘息组和对照组,差异有统计学意义(P<0.05),非喘息组外周血EOS、IL-17A、TNF-α、VEGF水平显著高于对照组,差异有统计学意义(P<0.05)。Pearson相关性分析结果显示,外周血EOS、IL-17A、TNF-α、VEGF水平与小儿肺炎支原体感染伴喘息呈正相关(P<0.05)。以是否存在喘息为状态变量,绘制受试者工作特征(ROC)曲线发现,外周血EOS、IL-17A、TNF-α、VEGF鉴别小儿肺炎支原体感染伴喘息曲线下面积为0.658、0.960、0.948、0.937。结论外周血EOS、IL-17A、TNF-α、VEGF水平与小儿肺炎支原体感染伴喘息呈正相关,可用于临床鉴别小儿肺炎支原体感染伴喘息。

关键词：外周血嗜酸性粒细胞白细胞介素-17A 小儿肺炎支原体感染喘息血管内皮生长因子肿瘤坏死因子α

Recent advances in exploring new blood-based biomarkers for the early diagnosis of gastric cancer

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2025年第1期 35-45页

作者： Xinyu peng Qian Ma Da Han School of Life Science Shanghai University Institute of Molecular Medicine Shanghai Key Laboratory for Nucleic Acid Chemistry and Nanomedicine State Key Laboratory of Oncogenes and Related Genes Renji Hospital School of Medicine Shanghai Jiao Tong University Department of Research and Development Intellinosis Biotechnologies Co.Ltd.

Gastric cancer(GC) is a prevalent and lethal malignancy worldwide, and the 5-year survival rate is less than 30%. The absence of distinctive symptoms often leads to late-stage diagnosis, contributing to a grim prognosis. Early detection is pivotal for improving the survival rates and outcomes of GC patients. Traditional diagnostic methods, including gastroscopy and histopathological examination, are restricted in the early diagnosis of GC. Conventional protein biomarkers, such as carcinoembryonic antigen(CEA), carbohydrate antigen 19-9(CA19-9), and carbohydrate antigen 72-4(CA72-4), exhibit insufficient sensitivity and specificity for GC screening, which diminishes their clinical value. Recently, novel circulating biomarkers, such as circulating tumor cells(CTCs), circulating tumor cell DNA(ct DNA), and circulating free RNA(cf RNA), have emerged as promising candidates in the burgeoning field of liquid biopsy due to their superior sensitivity and specificity. This review focuses on the latest research on blood-based biomarkers for GC diagnosis and examines the clinical potentials and challenges associated with these emerging biomarkers.

关键词：

同方期刊数据库

Advances in genotypic antimicrobialresistance testing: a comprehensive review

在线全文

学校读者我要写书评

暂无评论

Science China Life Sciences 2025年第01期 130-143页

作者： Boheng Duan Xianjun Zeng Junping peng Huan Kui College of Nanchang University Department of Imaging The Second Affiliated Hospital of Nanchang University NHC Key Laboratory of Systems Biology of Pathogens National Institute of Pathogen BiologyChinese Academy of Medical Sciences & Peking Union Medical College Key Laboratory of Respiratory Disease Pathogenomics Chinese Academy of Medical Sciences & Peking Union Medical College Key Laboratory of Pathogen Infection Prevention and Control (Ministry of Education) State Key Laboratory of Respiratory Health and MultimorbidityNational Institute of Pathogen BiologyChinese Academy of Medical Sciences & Peking Union Medical College

Antimicrobial resistance(AMR) represents a substantial threat to global public health, complicating the treatment of common infections and leading to prolonged illness and escalated healthcare expenses. To effectively combat AMR, timely and accurate detection is crucial for AMR surveillance and individual-based therapy. Phenotypic antibiotic resistance testing(AST) has long been considered the gold standard in clinical applications, serving as the foundation for clinical AMR diagnosis and optimized therapy. It has significantly contributed to ensuring patients′ health and the development of novel antimicrobials. Despite advancements in automated culture-based AST technologies,inherent limitations impede the widespread use of phenotypic AST in AMR surveillance. Genotypic AST technologies offer a promising alternative option, exhibiting advantages of rapidity, high sensitivity, and specificity. With the continuous advancement and expanding applications of genotypic AST technologies, such as microfluidics, mass spectrometry, and high-resolution melting curve analysis, new vigor has been injected into the development and clinical implementation of genotypic AST technologies. In this narrative review, we discuss the principles, applications, and advancements of emerging genotypic AST methods in clinical settings. The comprehensive review aims to highlight the significant scientific potential of emerging genotypic AST technologies in clinical AMR diagnosis, providing insights to enhance existing methods and explore novel approaches.

关键词：

同方期刊数据库

Boosting bidirectional sulfur conversion enabled by introducing boron-doped atoms and phosphorus vacancies in Ni2P for lithium-sulfur batteries

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2025年第1期100卷 760-769页

作者： Lin peng Yu Bai Hang Li Meixiu Qu Zhenhua Wang Kening Sun Advanced Research Institute of Multidisciplinary Science Beijing Institute of Technology Beijing Key Laboratory of Chemical Power Source and Green Catalysis School of Chemistry and Chemical Engineering Beijing Institute of Technology

Lithium-sulfur （Li-S） batteries have gained great attention due to the high theoretical energy density and low cost,yet their further commercialization has been obstructed by the notorious shuttle effect and sluggish redox ***,we supply a strategy to optimize the electron structure of Ni2P by concurrently introducing B-doped atoms and P vacancies in Ni2P （Vp-B-Ni2P）,thereby enhancing the bidirectional sulfur *** study indicates that the simultaneous introduction of B-doped atoms and P vacancies in Ni2P causes the redistribution of electron around Ni atoms,bringing about the upward shift of d-band center of Ni atoms and effective d-p orbital hybridization between Ni atoms and sulfur species,thus strengthening the chemical anchoring for lithium polysulfides （LiPSs） as well as expediting the bidirectional conversion kinetics of sulfur ***,theoretical calculations reveal that the incorporation of B-doped atoms and P vacancies in Ni2P selectively promotes Li2S dissolution and nucleation ***,the Li-S batteries with Vp-B-Ni2P-separators present outstanding rate ability of 777 m A h g-1at 5 C and high areal capacity of 8.03 mA h cm-2under E/S of 5μL mg-1and sulfur loading of 7.20 mg *** work elucidates that introducing heteroatom and vacancy in metal phosphide collaboratively regulates the electron structure to accelerate bidirectional sulfur conversion.

关键词： Lithium sulfur batteries

Increase in the variability of terrestrial carbon uptake in response to enhanced future ENSO modulation

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Atmospheric and Oceanic Science Letters 2025年第1期18卷 32-38页

作者： Younong Li Li Dan Jing peng Qidong Yang Fuqiang Yang Key Laboratory of Regional Climate-Environment for Temperate East Asia Institute of Atmospheric PhysicsChinese Academy of SciencesBeijingChina Key Laboratory of Atmospheric Environment and Processes in the Boundary Layer over the Low-Latitude Plateau Region Department of Atmospheric ScienceYunnan UniversityKunmingChina

El Niño-Southern Oscillation(ENSO)is a major driver of climate change in middle and low latitudes and thus strongly influences the terrestrial carbon cycle through land-air *** the ENSO modulation and carbon flux variability are projected to increase in the future,but their connection still needs further *** investigate the impact of future ENSO modulation on carbon flux variability,this study used 10 CMIP6 earth system models to analyze ENSO modulation and carbon flux variability in middle and low latitudes,and their relationship,under different scenarios simulated by CMIP6 *** results show a high consistency in the simulations,with both ENSO modulation and carbon flux variability showing an increasing trend in the *** higher the emissions scenario,especially SSP5-8.5 compared to SSP2-4.5,the greater the increase in *** flux variability in the middle and low latitudes under SSP2-4.5 increases by 30.9%compared to historical levels during 1951-2000,while under SSP5-8.5 it increases by 58.2%.Further analysis suggests that ENSO influences mid-and low-latitude carbon flux variability primarily through *** occurrence may potentially be attributed to the increased responsiveness of gross primary productivity towards regional temperature fluctuations,combined with the intensified influence of ENSO on land surface temperatures.

关键词： Carbon variability ENSO modulation CMIP6 models