检索结果-南通市图书馆

Plasma-induced chemical etching generating Ni_(3)S_(2) for formaldehyde detection

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

Chinese Chemical Letters 2022年第6期33卷 3035-3038页

作者： Jiaxin Zhou Li Zhao Qiang Wang Lixin Zuo Ana Zhao Huimin Yu Xue Jiang xiaoli xiong College of Chemistry and Materials Science Sichuan Normal UniversityChengdu 610068China

In this paper,Ni_(3)S_(2)nanosheet(NS)was generated by chemical etching with sodium sulfide directly on the nickel foam(NF),which was induced by dielectric barrier discharge plasma in *** with other chemical etching methods of nickel-based nanomaterials,this method was not only rapid(40 min)and mild(at room temperature and atmospheric pressure),but also showed consistent stability and good *** Ni_(3)S_(2)NS/NF electrode showed excellent performance in the electrochemical detection of formaldehyde under alkaline *** had a good linear relationship with the concentration of formaldehyde in the range of 0.002-5.45 mmol/L(R^(2)=0.9957)and the limit of detection(LOD)was 1.23μmol/L(S/N=3).The sensitivity was 1286.9μA L mmol^(–1)cm^(–2),and the response time was about 5 *** plasma-induced chemical etching strategy provides a simple and stable electrode preparation method,which has great application prospects in nonenzymatic electrochemical sensors.

关键词： Chemical etching Microplasma Electrochemical detection Formaldehyde

Nickel-carbonate nanowire array： An efficient and durable electrocatalyst for water oxidation under nearly neutral conditions

在线全文

学校读者我要写书评

暂无评论

Frontiers of Chemical Science and Engineering 2018年第3期12卷 467-472页

作者： Yuyao Ji Min Ma Xuqiang Ji xiaoli xiong Xuping Sun College of Chemistry and Materials Science Sichuan Normal University Chengdu 610068 China College of Chemistry Sichuan University Chengdu 610064 China Key Lab of Process Analysis and Cont ol of Sichuan Universities Yibin University Yibin 644000 China

It is highly attractive but still remains a great challenge to develop an efficient electrocatalyst for oxygen evolution reaction under nearly neutral conditions. In this work, we report the transformation of Ni3S2 nanowire array on nickel foam into the amorphous nickel carbonate nanowire array on nickel foam （NiCO3/NF）. The resulting NiCO3/NF shows high electrocatalytic activity towards water oxidation and affords current density of 50 mA. cm-2 at overpotential of 395 mV in 1.0 mol·L^-1 KHCO3. Moreover, this NiCO3/NF is also durable with a long-term electrochemical durability of 60 h. This catalyst electrode achieves a high turnover frequency of 0.21 mol O2·s^-1 at the overpotential of 500 mV.

关键词： water oxidation NiCO3/NF nearly neutral conditions superior activity electocatalyst

媒体情绪与企业风险承担——基于机器学习和文本分析的证据

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

系统工程理论与实践 2024年第6期44卷 1869-1895页

作者：宫晓莉徐小惠熊熊青岛大学经济学院青岛266071 天津大学复杂管理系统实验室天津300072 天津大学管理与经济学部天津300072

媒体舆论作为企业运营过程中与外界信息交互的重要渠道,能够通过信息加工和反馈潜移默化地影响企业决策.基于优化机器学习方法测量得到的媒体情绪得分,本文发现媒体情绪会抑制企业风险承担,这一结论经过充分稳健性检验后仍然成立.机制... 详细信息

媒体舆论作为企业运营过程中与外界信息交互的重要渠道,能够通过信息加工和反馈潜移默化地影响企业决策.基于优化机器学习方法测量得到的媒体情绪得分,本文发现媒体情绪会抑制企业风险承担,这一结论经过充分稳健性检验后仍然成立.机制分析表明,媒体情绪主要通过影响信息不对称程度、感染投资者情绪和加剧分析师羊群行为实现对企业风险承担的抑制效应.异质性分析表明相比于负面媒体情绪,正面媒体情绪在这一过程中起主导作用.除此之外,这一抑制效应在行业竞争程度更激烈、外部监督程度更严格时显著性降低,且在融资约束更高、金融化程度更高、高管在职消费现象更严重时更加明显.本文的研究不仅有助于厘清媒体情绪对企业风险承担的影响方式和途径,对于如何利用媒体力量助力企业风险决策和价值提升,促进实体经济高质量发展也有一定的政策启示.

关键词：媒体情绪机器学习企业风险承担信息不对称投资者情绪

同方期刊数据库

Preventative effect of massage on gastric volvulus in infants with gastroesophageal reflux-induced pneumonia

在线全文

学校读者我要写书评

暂无评论

Journal of Traditional Chinese Medicine 2015年第5期35卷 520-527页

作者： Yan Suqi xiong xiaoli Wan Qi Liu Fan Tang Jianqiao Jiang Zhixia Zhou Lishan Yuan Kai Xie Dong Department of Integrated Traditional Chinese and Western Medicine Wuhan Children's Hospital Department of Pediatrics Zhongnan Hospital of Wuhan University Department of Radiology Wuhan Children's Hospital

OBJECTIVE:To study the preventative effects of massage on gastric volvulus(GV) in infants with gastroesophageal reflux(GER)-induced ***:One-hundred and eighty GV with GER-induced pneumonia inpatients were divided randomly into four groups:basic treatment 1(n =60),basic treatment 2(n = 30),massage treatment1(n = 60) and massage treatment 2(n = 30).Clinical examinations selected between groups 1 and 2were *** of the upper gastrointestinal tract using iodine-containing contrast was assessed in group 1 before and after treatment,whereas 24-h pH monitoring of the distal esophagus was assessed in group 2 before and after *** scores and chest radiography were assessed in all groups upon hospital admission and after *** effects were estimated after procedures in all *** prevalence of severe pneumonia among the four groups was ***:Massage treatment groups showed a significantly higher percentage of cure and total effect(P0.05)than basic treatment ***,massage treatment groups had remarkably lower scores for symptoms and signs(P<0.05,P<0.01),especially for choking on milk,than basic treatment *** was significant attenuation of chest inflammation(P<0.05,P<0.01),GV(P<0.05,P<0.01) and GER(P<0.05,P<0.01) in massage treatment groups compared with those in basic treatment ***,massage treatment groups demonstrated a lower prevalence of severe pneumonia than basic treatment groups(P<0.05).CONCLUSION:Massage treatment can prevent GV with GER-induced pneumonia in infants by timely correction of stomach rotation and subsequent attenuation of GER.

关键词： Pneumonia Infant Massage Stomach volvulus Gastroesophageal reflux

Cu_(2)Sb decorated Cu nanowire arrays for selective electrocatalytic CO_(2)to CO conversion

在线全文

学校读者我要写书评

暂无评论

Nano Research 2021年第8期14卷 2831-2836页

作者： Shiyong Mou Yonghao Li Luchao Yue Jie Liang Yonglan Luo Qian Liu Tingshuai Li Siyu Lu Abdullah M.Asiri xiaoli xiong Dongwei Ma Xuping Sun College of Chemistry and Materials Science Sichuan Normal UniversityChengdu 610068China Chemical Synthesis and Pollution Control Key Laboratory of Sichuan Province School of Chemistry and Chemical engineeringChina West Normal UniversityNanchong 637002China Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of ChinaChengdu 610054China Green Catalysis Center and College of ChemistryZhengzhou UniversityZhengzhou 450001China Chemistry Department Faculty of Science&Center of Excellence for Advanced Materials ResearchKing Abdulaziz UniversityP.O.Box 80203Jeddah 21589Saudi Arabia Key Laboratory for Special Functional Materials of Ministry of Education and School of Materials Science and Engineering Henan UniversityKaifeng 475004China

The advancement of cost-effective and selective electrocatalyst towards CO_(2) to CO conversion is crucial for renewable energy conversion and storage,thus to achieve carbon-neutral cycle in a sustainable *** this communication,we report that CujSb decorated Cu nanowire arrays on Cu foil act as a highly active and selective electrocatalyst for CO_(2) to CO *** CO_(2)-saturated 0.1 M KHCO_(3),it achieves a high Faraday efficiency(FE)of 86.5%for CO,at-0.90 V *** hydrogen electrode(RHE).The H_(2)/CO ratio is tunable from 0.08:1 to 5.9:1 by adjusting the *** is worth noting that HCOO-product was totally suppressed on such catalyst,compared with Sb *** improving selectivity for CO could be attributed to the bimetallic effect and nanowire arrays structure.

关键词： Cu_(2)Sb nanowire arrays electrochemical CO_(2)reduction CO_(2)to CO conversion

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

盆腔腹膜后血管球瘤一例

中华放射学杂志 2018年第12期52卷 965-966页

作者：熊小丽南昌大学第二附属医院影像中心 330006

患者女,48岁。体检发现盆腔包块4个月余。专科检查:子宫右后方可触及1个鸭蛋大小的包块,质软,界清,无活动度,无触痛;双侧附件无异常;右侧腹股沟淋巴结稍肿大,有压痛。既往行胆囊切除手术。实验室检查:人乳头瘤病毒43型阳性;血常规、生... 详细信息

患者女,48岁。体检发现盆腔包块4个月余。专科检查:子宫右后方可触及1个鸭蛋大小的包块,质软,界清,无活动度,无触痛;双侧附件无异常;右侧腹股沟淋巴结稍肿大,有压痛。既往行胆囊切除手术。实验室检查:人乳头瘤病毒43型阳性;血常规、生化检查、肝肾功能正常;癌胚抗原、甲胎蛋白、糖类抗原CAl25、CAl99均阴性。

关键词：盆腔包块血管球瘤腹膜后实验室检查腹股沟淋巴结胆囊切除手术人乳头瘤病毒 CAl99

Q690高强钢焊接T形截面纵向残余应力分布数值模拟

在线全文

学校读者我要写书评

暂无评论

太原理工大学学报 2023年第1期54卷 107-116页

作者：熊晓莉卢梦丹卢娅囡河南工业大学土木工程学院郑州450001

焊接纵向残余应力是影响钢压杆整体稳定性的重要因素之一。基于ANSYS对Q690高强钢焊接T形截面纵向残余应力大小及分布情况进行数值模拟分析。通过与已有的研究成果对比,提出合理的有限元分析模型;借助该模型,分析纵向残余应力大小及分... 详细信息

焊接纵向残余应力是影响钢压杆整体稳定性的重要因素之一。基于ANSYS对Q690高强钢焊接T形截面纵向残余应力大小及分布情况进行数值模拟分析。通过与已有的研究成果对比,提出合理的有限元分析模型;借助该模型,分析纵向残余应力大小及分布随板件宽厚比和板厚的变化规律;以及翼缘和腹板残余应力的自平衡性;并提出适合Q690高强钢焊接T形截面的纵向残余应力分布模型。研究结果表明:提出的有限元分析模型适合焊接T形截面纵向残余应力研究;翼缘外伸端以及腹板中部的纵向残余压应力大小随板件宽厚比、板件厚度的增大成下降趋势,翼缘与腹板相交焊缝处和腹板外伸端的纵向残余拉应力大小与板件宽厚比和板件厚度没有多大联系;各板件内的残余应力均满足自平衡。基于数值模拟分析,提出的Q690高强钢焊接T形截面纵向残余应力分布模型,为后续T形截面残余应力的试验研究及压杆的整体稳定性数值分析提供参考。

关键词： Q690高强钢焊接T形截面纵向残余应力数值模拟热-结构耦合分析

Q460高强钢焊接T形截面纵向残余应力分布

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

焊接学报 2023年第8期44卷 63-73,I0007页

作者：熊晓莉卢娅囡卢梦丹管欣旺李璐河南工业大学郑州450001

采用分割法测量了4个Q460高强钢焊接T形截面的纵向残余应力分布;借助通用有限元程序ANSYS,采用热-结构耦合分析方法模拟钢板的切割和焊接过程,将数值模拟获得的纵向残余应力与试验值进行对比,从而验证有限元分析过程的正确性;基于有限... 详细信息

采用分割法测量了4个Q460高强钢焊接T形截面的纵向残余应力分布;借助通用有限元程序ANSYS,采用热-结构耦合分析方法模拟钢板的切割和焊接过程,将数值模拟获得的纵向残余应力与试验值进行对比,从而验证有限元分析过程的正确性;基于有限元方法获得更多不同截面尺寸的Q460高强钢焊接T形截面纵向残余应力分布,对丰富的数据进行汇总分析,重点研究板件宽厚比和板厚对残余应力大小及分布的影响.结果表明,残余拉应力分布在焊缝周边区域、翼缘和腹板外伸端,残余压应力则分布在翼缘外伸段中部及腹板中部区域;残余拉应力与板件宽厚比和板厚均无关,残余压应力与板件宽厚比和板厚成反比;翼缘和腹板的残余应力均达到自平衡.提出的Q460高强钢焊接T形截面纵向残余应力分布模型,可为后续钢压杆的整体稳定承载力数值分析提供重要参考.

关键词： Q460高强钢焊接T形截面纵向残余应力分割法热-结构耦合分析

国产Q460高强钢焊接T形截面轴心压杆整体稳定承载力研究

在线全文

学校读者我要写书评

暂无评论

建筑结构 2023年第10期53卷 62-66,121页

作者：熊晓莉都坤马萌河南工业大学土木工程学院郑州450001

为了研究国产Q460高强钢焊接T形截面轴心压杆的整体稳定承载力,用厚度为8mm和12mm的国产Q460高强度钢板制作了3根焊接T形截面试件进行轴心受压试验。基于实测的钢材力学性能、截面残余应力和试件几何尺寸,建立考虑了初始几何缺陷和力学... 详细信息

为了研究国产Q460高强钢焊接T形截面轴心压杆的整体稳定承载力,用厚度为8mm和12mm的国产Q460高强度钢板制作了3根焊接T形截面试件进行轴心受压试验。基于实测的钢材力学性能、截面残余应力和试件几何尺寸,建立考虑了初始几何缺陷和力学缺陷的有限元模型,分析预测试件的极限承载力,并将有限元结果与试验结果进行对比,验证有限元分析方法的正确性。利用经试验验证的有限元分析方法,补充计算了24根不同长细比压杆的整体稳定极限承载力,将相应的整体稳定系数与《钢结构设计标准》(GB 50017—2017)中的柱子稳定系数曲线进行比较。研究表明,国产Q460高强钢焊接T形截面轴心压杆的整体失稳形式为绕对称轴的弯扭失稳,失稳时压杆进入了弹塑性变形阶段,在设计过程中选取b类截面柱子曲线对其进行计算是安全可靠的。

关键词：高强钢焊接T形截面轴心压杆整体稳定极限承载力有限元分析