检索结果-南通市图书馆

Subgrain microstructures and tensile properties of 316L stainless steel manufactured by selective laser melting

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2021年第9期28卷 1159-1167页

作者： Xin Yang Wen-jun Ma Yao-jia Ren Shi-feng Liu Yan Wang Wan-lin Wang Hui-ping Tang College of Materials Science and Engineering Xi’an University of TechnologyXi’an710048ShaanxiChina School of Metallurgical and Engineering Xi’an University of Architecture and TechnologyXi’an710055ShaanxiChina State Key Laboratory of Porous Metal Materials Northwest Institute of Nonferrous MetalsXi’an710016ShaanxiChina

316L stainless steel samples were manufactured by selective laser melting(SLM).The microstructure of SLM-made 316L stainless steel and the room temperature tensile properties both perpendicular and along the building direction were studied and *** static temperature field during the molten pool formation was simulated by finite element *** indicates that the nonlinear asymmetrical inclined temperature gradient in SLM process produces a large surface tension *** melt forms a Marangoni flow with different convection modes under the action of surface tension as well as a micro-molten pool morphology with subgrain structures such as strip,hexagonal and elongated cellular *** addition,there are also epitaxially grown columnar *** growth of columnar crystals is not affected by the boundary of the molten *** structures and low-angle grain boundaries make the tensile strength and the elongation of SLM-made 316L sample higher as compared to those of the cast and wrought *** room temperature tensile strength of the sample perpendicular to the building direction is higher than that of the sample along the building direction,while the elongation is lower than that of the sample along the building direction.

关键词： Selective laser melting 316L stainless steel Finite element simulation Microstructure Mechanical property

急性淋巴细胞白血病患儿医院感染防控对策研究

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

现代医药卫生 2024年第14期40卷 2393-2396页

作者：王勤毛彦娜王俊刘慧萍林佳郑州大学附属儿童医院/河南省儿童医院/郑州儿童医院感染防控科河南郑州450018 郑州大学附属儿童医院/河南省儿童医院/郑州儿童医院血液肿瘤科河南郑州450018

目的探讨急性淋巴细胞白血病患儿医院感染的防控对策。方法选取2019年1月至2022年6月该院血液肿瘤科收治的282例急性淋巴细胞白血病住院患儿,将其随机分为对照组(n=138)、观察组(n=144),2组均实施常规治疗及护理措施,观察组增加预防医... 详细信息

目的探讨急性淋巴细胞白血病患儿医院感染的防控对策。方法选取2019年1月至2022年6月该院血液肿瘤科收治的282例急性淋巴细胞白血病住院患儿,将其随机分为对照组(n=138)、观察组(n=144),2组均实施常规治疗及护理措施,观察组增加预防医院感染防控对策,对比2组患儿医院感染率、感染部位及总体健康水平。结果对照组患儿共发生医院感染22例25例次,观察组共发生医院感染10例12例次,对照组、观察组患儿医院感染发生率分别为15.94%、6.94%,对照组、观察组患儿医院感染例次发生率分别为18.12%、8.33%,观察组患儿医院感染发生率、医院感染例次发生率均低于对照组,差异均有统计学意义(P<0.05);感染主要部位为上呼吸道,革兰阴性菌为主要感染病原菌;观察组生活质量(QOL)评分[(69.87±3.41)分]高于对照组[(63.88±3.09)分],差异有统计学意义(P<0.05)。结论对急性淋巴细胞白血病采取感染防控对策可有效降低患儿医院感染发生率,提高其总体健康水平,有效缓解负性情绪。

关键词：急性淋巴细胞白血病恶性肿瘤医院感染防控对策

Uptake and accumulation of phenanthrene and pyrene in spiked soils by Ryegrass(Lolium perenne L.)

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2005年第5期17卷 817-822页

作者： XU Sheng-you CHEN ying-xu lin Qi WU Wei-xiang XUE Sheng-guo SHEN Chao-feng Department of Environmental Engineering Zhejiang University Hangzhou 310029 China Department of Resource and Environment Huangshan University Huangshan 245000 China

Phytoremediation has long been recognized as a cost-effective method for the removal of polycyclic aromatic hydrocarbons （PAHs） from soil. A study was conducted to investigate the uptake and accumulation of PAHs in root and shoot of Lolium perenne L. Pot experiments were conducted with series of concentrations of 3.31-378.37 mg/kg for phenanthrene and those of 4.22-365.38 mg/kg for pyrene in a greenhouse. The results showed that both ryegrass roots and shoots did take up PAHs from spiked soils, and generally increased with increasing concentrations of PAH in soil. Bioconcentration factors（BCFs） of phenanthrene by shoots and roots were 0.24- 4.25 and 0.17-2.12 for the same treatment. BCFs of pyrene by shoots were 0.20-1.5, except for 4.06 in 4.32 mg/kg treatment, much lower than BCFs of pyrene by roots （0.58-2.28）. BCFs of phenanthrene and pyrene tended to decrease with increasing concentrations of phenanthrene and pyrene in soil. Direct uptake and accumulation of these compounds by Lolium perenne L. was very low compared with the other loss pathways, which meant that plant-promoted microbial biodegradation might be the main contribution to plant-enhanced removal of phenanthrene and pyrene in soil. However, the presence of Lolium perenne L. significantly enhanced the removal of phenanthrene and pyrene in spiked soil. At the end of 60 d experiment, the extractable concentrations of phenanthrene and pyrene were lower in planted soil than in non-planted soil, about 83.24%-91.98% of phenanthrene and 68.53%-84.10% of pyrene were removed from soils, respectively. The results indicated that the removal of PAHs in contaminated soils was a feasible approach by using Lolium perenne L.

关键词： phytoremediation polycyclic aromatic hydrocarbons(PAHs) phenanthrene and pyrene uptake and accumulation

通窍活血汤加减联合甘露醇治疗椎动脉型颈椎病的临床疗效观察

在线全文

学校读者我要写书评

暂无评论

中国现代药物应用 2024年第3期18卷 134-137页

作者：林叶发周颖黄君李青青梁华庚宜春学院第二附属医院 336000 宜春市中医院 336000

目的探讨通窍活血汤加减联合甘露醇治疗椎动脉型颈椎病的临床疗效。方法50例椎动脉型颈椎病患者,选择随机数字表法分成对照组及观察组,各25例。对照组接受甘露醇注射液联合氟桂利嗪胶囊治疗,观察组在对照组基础上加用通窍活血汤加减治... 详细信息

目的探讨通窍活血汤加减联合甘露醇治疗椎动脉型颈椎病的临床疗效。方法50例椎动脉型颈椎病患者,选择随机数字表法分成对照组及观察组,各25例。对照组接受甘露醇注射液联合氟桂利嗪胶囊治疗,观察组在对照组基础上加用通窍活血汤加减治疗。比较两组治疗效果、治疗前后症状和体征积分与椎动脉血流指标[左侧椎动脉平均血流速(LVA-Vm)、右侧椎动脉平均血流速(RVA-Vm)、左侧椎动脉血流阻力指数(LVA-RI)、右侧椎动脉血流阻力指数(RVA-RI)]水平,安全性。结果观察组治疗总有效率96.00%高于对照组的76.00%(P<0.05)。两组治疗后症状和体征积分均高于同组治疗前,且观察组治疗后症状和体征积分(21.06±2.12)分高于对照组的(13.47±1.95)分(P<0.05)。两组治疗后LVA-Vm、RVA-Vm水平均高于同组治疗前,LVA-RI、RVA-RI水平均低于同组治疗前,且观察组治疗后LVA-Vm(31.20±3.32)cm/s、RVA-Vm(32.06±2.97)cm/s均高于对照组的(27.65±2.87)、(28.11±2.44)cm/s,LVA-RI(0.54±0.06)、RVA-RI(0.46±0.10)均低于对照组的(0.62±0.07)、(0.64±0.09)(P<0.05)。两组治疗期间均未出现三大常规异常或肝肾功能异常情况,也无其他不良反应,安全性良好。结论通窍活血汤加减联合甘露醇治疗椎动脉型颈椎病疗效显著,能够有效改善患者的椎动脉血流状况,且安全性良好。

关键词：椎动脉型颈椎病通窍活血汤甘露醇椎动脉血流

新型气相色谱-质谱法测定环境空气中多氯联苯的方法验证

在线全文

学校读者我要写书评

暂无评论

江西化工 2024年第1期40卷 35-41页

作者：程泽英易永胡海山刘永林江西省检验检测认证总院检测认证技术发展研究院江西南昌330029

多氯联苯(PCBs)长期广泛存在于环境中,并会对人体健康以及动植物造成极大危害。为满足环境空气中多氯联苯项目的监测要求,本论文采用一种新型的气相色谱-质谱法,即具有广谱PCBs测试的方法验证,按照《环境空气多氯联苯的测定气相色谱-质... 详细信息

多氯联苯(PCBs)长期广泛存在于环境中,并会对人体健康以及动植物造成极大危害。为满足环境空气中多氯联苯项目的监测要求,本论文采用一种新型的气相色谱-质谱法,即具有广谱PCBs测试的方法验证,按照《环境空气多氯联苯的测定气相色谱-质谱法》(HJ902—2017)的标准,最终获得优异的测试结果。实验结果表明,此种新型方法验证对27种多氯联苯及其衍生物在浓度范围为25.0~500μg/L内都呈现出较好的线性关系,其中相关系数均超过0.997,并且此方法验证的检出限、精密度、准确度均满足HJ902—2017标准。此结果表明此方法可以测定环境空气中27种氯联苯及其衍生物的能力。

关键词：多氯联苯方法验证气相色谱-质谱联用仪

广义等效均匀剂量生物优化法在食管癌调强计划的应用

在线全文

学校读者我要写书评

暂无评论

承德医学院学报 2024年第1期41卷 5-9页

作者：葛佳林何瑞龙廖润超许士奇承德医学院生物医学工程系河北承德067000 承德医学院附属医院

目的探讨食管癌调强计划中广义等效均匀剂量生物优化法的应用。方法选取承德医学院附属医院8例食管癌患者。每位患者使用三种方式进行运算,分别是对心脏和肺采用单目标物理优化法(PlanA),多目标物理优化法(PlanB)以及广义等效均匀剂量... 详细信息

目的探讨食管癌调强计划中广义等效均匀剂量生物优化法的应用。方法选取承德医学院附属医院8例食管癌患者。每位患者使用三种方式进行运算,分别是对心脏和肺采用单目标物理优化法(PlanA),多目标物理优化法(PlanB)以及广义等效均匀剂量生物优化法(PlanC)。脊髓及其外放的约束条件保持不变,对比3组计划的优劣。结果在靶区和脊髓以及脊髓外扩剂量没有发生明显变化时,用广义等效均匀剂量生物优化法设计的计划在肺和心脏的大部分均值都下降,Plan A与Plan C对比显示,肺的V5、V10、V20、V30及Dmean均有差异且具有统计学意义(P<0.05),心脏的V5、V10、V20及Dmean均有差异且具有统计学意义(P<0.05)。Plan B与PlanC对比显示,肺的V5、V10、V20、V30、V40及Dmean均有差异且具有统计学意义(P<0.05),心脏的V5、V20及Dmean均有差异且具有统计学意义(P<0.05)。在剂量体积直方图(DVH)的显示中,在计划靶区(PTV)曲线没有明显变化且脊髓及脊髓外扩也没有明显变化的情况下,肺和心脏的曲线均有不同程度的左移。并且肺的正常组织并发症概率(NTCP)下降且具有统计学意义(P<0.05)。结论采用广义等效均匀剂量生物优化法可以降低肺和心脏的照射剂量。广义等效剂量生物优化法要更优于多目标优化法和单目标优化法,可以更好的保护危及器官。

关键词：广义等效均匀剂量生物优化法食管癌单目标优化法多目标优化法

经验性膳食炎症指数与老年冠心病患者病情及炎症状态的关系

在线全文

学校读者我要写书评

暂无评论

中国食物与营养 2024年第3期30卷 78-82页

作者：任琳王倩陈皓赵甲彧马利祥秦皇岛市第一医院心血管内科河北秦皇岛066000 秦皇岛市第一医院老年病科河北秦皇岛066000

目的:探讨经验性膳食炎症指数(eDⅡ)与老年冠心病患者病情及炎症状态的关系。方法:选取2021年1月—2023年1月在本院收治的老年冠心病患者45例作为病例组,选取同期30名健康体检者作为对照组。进一步依据Gensini评分评估患者病情,分为轻... 详细信息

目的:探讨经验性膳食炎症指数(eDⅡ)与老年冠心病患者病情及炎症状态的关系。方法:选取2021年1月—2023年1月在本院收治的老年冠心病患者45例作为病例组,选取同期30名健康体检者作为对照组。进一步依据Gensini评分评估患者病情,分为轻度组、中度组、重度组。采用酶联免疫吸附法检测IL-6、IL-10、CTP、CatK、MMP-2、MMP-9,采用双抗体夹心酶联免疫吸附试验检测TNF-α,采用免疫散射比浊法检测hs-CRP。比较不同组eDⅡ评分、炎症因子、Gensini评分,相关性分析eDⅡ与病情及炎症状态的关系。结果:病例组eDⅡ、炎症因子均高于对照组(P<0.05);3组eDⅡ、炎症因子、Gensini评分比较差异有统计学意义(P<0.05),重度组最高,中度组次之,轻度组最低;3组斑块稳定性相关指标(CTP、CatK、MMP-2、MMP-9)比较差异有统计学意义(P<0.05),重度组最高,中度组次之,轻度组最低;相关性分析显示,老年冠心病患者eDⅡ与斑块稳定性相关指标、炎症因子均呈正相关(P<0.05)。结论:高eDⅡ值与较高的炎症因子水平和Gensini评分相关,提示了膳食炎症对冠心病的发展和炎症状态的影响,通过调整饮食以降低膳食炎症指数,可能有助于改善老年冠心病患者的病情和炎症状态。

关键词：老年冠心病经验性膳食炎症指数(eDⅡ) 炎症状态

维普期刊数据库博看期刊

Performance optimization of self-powered visible photodetectors based on Cu2O/electrolyte heterojunctions

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2020年第12期29卷 531-535页

作者： Zhi-Ming Bai ying-Hua Zhang Zhi-An Huang Yu-Kun Gao jia Liu School of Civil and Resource Engineering University of Science and Technology BeijingBeijing 100083China

The performance of the self-powered photodetectors based on the Cu2O/electrolyte heterojunctions is optimized by adjusting morphology and structure of the Cu2O *** Cu2O film with a deposition time of 2000 s possesses a largest current density of 559.6μA/cm2 under visible light illumination at zero bias,with a rising time of 5.2 ms and a recovering time of 9.0 *** optimized Cu2O film has a highest responsivity of about 25.8 mA/W for visible light,and a negligible responsivity for UV *** high crystallinity and excellent charge transfer property are responsible for the improved photodetection performance.

关键词： self-powered visible photodetector Cu2O photoelectrochemical

Phylogenetic and Structural Analysis of Major Surface Proteins Hemagglutinin and Neuraminidase of Novel Avian Influenza Virus A H7N9 from Chinese Patient

在线全文

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2013年第5期29卷 934-940页

作者： YUAN Xiao-hui WANG ying-chen QU Zhang-yi REN jia-yi WU Xiao-min WANG Jing-fei Department of Microbiology Public Health College Harbin Medical University Harbin 150081 P. R. China Institute of Pathogen Biology Chinese Academy of Medical Sciences & Peking Union Medical College Beijing 100176 P R. China Key Laboratory of Resource and Plant Biology of Anhui Province College of Life Science Huaibei Normal University Huaibei 235000 P. R. China Harbin Veterinary Research Institute Chinese Academy of Agricultural Sciences Harbin 150081 P R. China

This research reveals the phylogenetic history and structural information of the hemagglutinin（HA） and neuraminidase（NA） from novel avian influenza virus A/Hangzhou/1/2013（HTN9_2013） strain from human infected in China. Strains closely related to the HTN9 2013 strain were obtained from Nation Center for Biotechnology Information（USA）-basic local alignment search tool（NCBI-BLAST） searching, and the phylogenetic trees were con- structed. The 3D structures of HA and NA from H7N9 2013 strain were built by homology modeling technology, and molecular dynamics（MD） simulations were performed on the high-performance computer cluster. Characteristic amino acid sites were then screened from multiple sequence alignment（MSA） via home-made Python script and mapped onto the 3D structures. The thermodynamic characteristic root-mean-square-fluctuation （RMSF） of these sites in the structure was also analyzed with MD trajectories. The HA of HTN9_2013 strain is closely related to the A/duck/Zhejiang/12/2011 strain isolated in China, while the NA of HTN9 2013 strain is mostly related to the A/mallard/Czech Republic/13438-29K/2010 strain isolated in Europe. The 3D structures of HA and NA from H7N9 2013 stain are mostly identical to the existing structure of H7 and N9. A total of 11 and 14 characteristic ami- no acid sites were identified in HA and NA, respectively, in HTN9_2013. Structural analysis indicates that certain sites in the top region of HA are important, at which the mutation of some amino acids can impact the receptor bin- ding that may be related to its infection of human beings.

关键词： Avian influenza virus Hemagglutinin Neuraminidase Homology modeling Phylogenetic