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可靠性约束下的重型数控机床维修策略

机床与液压 2024年第8期52卷 189-195页

作者：陈红霞郭春成李宏悦李晨光张俊峰内蒙古工业大学机械工程学院内蒙古呼和浩特010051 内蒙古自治区先进制造技术重点实验室内蒙古呼和浩特010051

针对TH65140重型数控机床的各个子系统进行危害度分析,制定经济高效的预防性维修策略。通过威布尔分布对重型数控机床进行可靠性建模,在可靠度约束下,建立以最小维修费用和最大可用度为目标的机床子系统定期预防性维修模型,对模型进行... 详细信息

针对TH65140重型数控机床的各个子系统进行危害度分析,制定经济高效的预防性维修策略。通过威布尔分布对重型数控机床进行可靠性建模,在可靠度约束下,建立以最小维修费用和最大可用度为目标的机床子系统定期预防性维修模型,对模型进行求解得到了最优的维修次数及维修间隔期,制定出了重型数控机床的预防性维修策略。

关键词：重型数控机床威布尔分布维修策略可靠性

补骨脂提取物对去卵巢骨质疏松大鼠骨代谢水平的影响

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中西医结合研究 2024年第1期16卷 35-38页

作者：张峰王春成王冰薛士鹏南阳医学高等专科学校教务处河南南阳473000 南阳医学高等专科学校中医系河南南阳473000 南阳医学高等专科学校针灸骨伤系河南南阳473000 南阳医学高等专科学校基础医学部河南南阳473000

目的探讨补骨脂提取物对去卵巢骨质疏松大鼠骨代谢指标的影响。方法将60只雌性SD大鼠随机分为对照组、模型组、补骨脂提取物组和西药组,每组15只。除对照组外,各组通过切除大鼠两侧卵巢组织进行造模,对照组大鼠仅暴露卵巢而不行切除术... 详细信息

目的探讨补骨脂提取物对去卵巢骨质疏松大鼠骨代谢指标的影响。方法将60只雌性SD大鼠随机分为对照组、模型组、补骨脂提取物组和西药组,每组15只。除对照组外,各组通过切除大鼠两侧卵巢组织进行造模,对照组大鼠仅暴露卵巢而不行切除术。造模成功后,补骨脂提取物组给予补骨脂素(88 mg/kg)灌胃,西药组给予阿仑膦酸钠(7 mg/kg)灌胃,对照组和模型组则灌胃等体积生理盐水;连续12周。采用酶联免疫吸附实验检测各组大鼠血清骨钙素(osteocalcin,OCN)、骨特异性碱性磷酸酶(bone-specific alkaline phosphatase,BAP)、Ⅰ型胶原交联C-末端肽(C-terminal telopeptide of typeⅠcollagen,CTX)水平;采用RT-PCR法检测大鼠股骨和胫骨骨髓中Wnt3a和β-catenin的mRNA表达;采用双能X线骨密度仪检测大鼠腰椎和股骨的骨密度(bone mineral density,BMD)。结果与对照组比较,模型组大鼠血清CTX水平显著升高(P0.05)。与对照组比较,模型组大鼠股骨和胫骨骨髓中Wnt3a、β-catenin的mRNA表达明显降低(P均0.05)。结论补骨脂提取物能提高去卵巢骨质疏松大鼠骨密度,改善骨代谢指标,其作用可能与活化Wnt/β-catenin有关。

关键词：补骨脂提取物骨质疏松大鼠骨代谢

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双阳水管NS分量异常分析及其预报效能评估

防灾减灾学报 2024年第2期40卷 57-62页

作者：唐春呈张仁鹏焉恒琦张帆乔天罡吉林省地震局吉林长春130117

利用中国地震局《震情会商技术方法业务应用推荐清单(2022)》中列装的异常判定方法,对双阳台DSQ型水管倾斜仪NS分量2008-2023年观测数据进行处理,整理归纳出现的异常,利用R值评分对该测项预报效能进行评估,结果显示:速率分析法R值为0.6... 详细信息

利用中国地震局《震情会商技术方法业务应用推荐清单(2022)》中列装的异常判定方法,对双阳台DSQ型水管倾斜仪NS分量2008-2023年观测数据进行处理,整理归纳出现的异常,利用R值评分对该测项预报效能进行评估,结果显示:速率分析法R值为0.6,且通过R值检验,可以用于该测项的预测预报工作;破年变分析法和趋势转折法虽未通过R值检验,但都是对应率高、漏报率和虚报率低,也为该测项的预测预报工作提供了参考。

关键词：水管倾斜仪震情会商技术方法异常分析预报效能评估 R值检验

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The effect of a conductive polyaniline/carbon black composite on the performance of a semiconductive layer

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High Voltage 2022年第2期7卷 233-241页

作者： Enmin Wang Sheng zhang Ciyao Wang Shumei Chen chuncheng Hao Qingquan Lei Institute of Advanced Electrical Materials Qingdao University of Science and TechnologyQingdaoChina State Key Laboratory of Advanced Power Transmission Technology(Global Energy Interconnection Research Institute Co. Ltd.)BeijingChina

In this study,conductive polyaniline(PANI)ribbons were introduced to a semi-conductive layer to improve the conductivity stability of the layer during thermal expansion and enhance its ability to inhibit charge injection into the insulating *** maximise the effect of PANI,PANI and carbon black(CB)were preformed into a uniformly dispersed composite,which was then added to the polymer matrix of the semiconductive *** experimental results show that the resistivity of the semi-conductive layer containing the PANI/CB composite is more stable during thermal expansion than that of the semiconductive layer only doped with *** is attributed to the conductive CB network being enhanced by the PANI *** addition,due to the unique conductivity mechanism and high dielectric constant of PANI,the semiconductive layer has a strong ability to inhibit space charge injection into the insulating layer.

关键词： composite conductive layer

热塑性复合材料玻璃纤维环氧成膜剂的制备与性能研究

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复合材料科学与工程 2024年第6期 112-117页

作者：潘超超李鹏潘春呈侯勇张兆斌陆泽栋北京化工大学材料科学与工程学院北京100029 泰山玻璃纤维有限公司泰安271000 杭州环保科技咨询有限公司杭州310003

本文采用化学改性法,以环氧氯丙烷、共聚物P105、环氧树脂E-51和双酚A为原料,制备了一种水性环氧树脂乳液作为玻璃纤维成膜剂,研究了原料摩尔比、E-P105用量和乳化温度对乳液粒径和稳定性的影响。结果表明,当P105、ECH、NaOH摩尔比为1∶... 详细信息

本文采用化学改性法,以环氧氯丙烷、共聚物P105、环氧树脂E-51和双酚A为原料,制备了一种水性环氧树脂乳液作为玻璃纤维成膜剂,研究了原料摩尔比、E-P105用量和乳化温度对乳液粒径和稳定性的影响。结果表明,当P105、ECH、NaOH摩尔比为1∶1.5∶1.2,环氧树脂与双酚A摩尔比为2.25∶1,E-P105质量份数为环氧树脂和双酚A质量的20%,乳化温度为60℃时,乳液粒径为0.387μm,粒径分布均匀,具有良好的稳定性,经上浆处理后的玻璃纤维复合材料力学性能优异。

关键词：玻璃纤维成膜剂水性环氧树脂乳液化学改性法复合材料

一起副溶血性弧菌食物中毒事件中菌株全基因组测序与耐药性分析

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中国食品卫生杂志 2024年第5期36卷 528-532页

作者：李兵兵张茹刘靓李洁陈大伟李双姝杨鹏飞刘纯成邢亚东淮安市疾病预防控制中心江苏淮安223001 盱眙县疾病预防控制中心江苏淮安211700

目的对2023年淮安市一起食物中毒事件分离的副溶血性弧菌进行全基因组测序和耐药性分析,为副溶血性弧菌引起的食源性疾病的防控和临床治疗提供参考。方法采用Illumina测序平台进行全基因组测序,通过全基因组单核苷酸多态性(wg-SNP)和多... 详细信息

目的对2023年淮安市一起食物中毒事件分离的副溶血性弧菌进行全基因组测序和耐药性分析,为副溶血性弧菌引起的食源性疾病的防控和临床治疗提供参考。方法采用Illumina测序平台进行全基因组测序,通过全基因组单核苷酸多态性(wg-SNP)和多位点序列分型(MLST)分析进行溯源,在线数据库鉴定菌株携带的毒力和耐药基因,采用微量肉汤稀释法进行药敏实验。结果共分离到12株副溶血性弧菌,3株来自病例、9株来自留样食品。其中2株食物分离株与3株病例分离株wg-SNP差异数为0~2 bp,都属于ST3型,判断为同一克隆;其余7株食物分离株与病例分离株wg-SNP差异数为11341~37173 bp,判定为不同克隆。从病例和食品中分离的ST3型副溶血性弧菌都携带外毒素基因tdh和tlh,其余菌株仅携带tlh。本事件分离的副溶血性弧菌都携带blaCARB型耐药基因,且对头孢唑啉耐药率较高。结论通过全基因组测序分析,本起事件由携带tdh毒力基因的ST3型副溶血性弧菌污染食品引发,显示全基因组测序技术在中毒事件快速溯源中有较好的应用前景。该菌株对头孢唑啉耐药,可为临床治疗抗生素选用提供依据。

关键词：副溶血性弧菌食物中毒全基因组测序耐药性食源性致病菌毒力基因

CO_(2) capture by double metal modified CaO-based sorbents from pyrolysis gases

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Chinese Journal of Chemical Engineering 2022年第3期35卷 40-49页

作者： Xiaobin Chen Yuting Tang chuncheng Ke Chaoyue zhang Sichun Ding Xiaoqian Ma School of Electric Power South China University of TechnologyGuangzhou 510640China Guangdong Province Key Laboratory of Efficient and Clean Energy Utilization Guangzhou 510640China

High-temperature pyrolysis technology can effectively solve the problem of municipal solid waste ***,the pyrolysis gas contains a large amount of CO_(2),which would adversely affect the subsequent *** address this problem,a novel method of co-precipitation modification with Ca,Mg and Zr metals was proposed to improve the CO_(2)capture performance.X-ray diffraction(XRD)patterns and energy dispersive X-ray spectroscopy analysis showed that the two inert supports MgO and CaZrO_(3)were uniformly distributed in the modified calcium-based *** addition,the XRD results indicated that CaZrO_(3)was produced by the reaction of ZrO_(2)and CaO at high *** effects of doping ratios,adsorption temperature,calcination temperature,CO_(2)concentration and calcination atmosphere on the adsorption capacity and cycle stability of the modified calcium-based sorbent were *** modified calcium-based sorbent achieved the best CO_(2)capture performance when the doping ratio was 10:1:1 with carbonation at 700℃ under 20%CO_(2)/80%N_(2)atmosphere and calcination at 900℃ under100%N_(2)*** ten cycles,the average carbonation conversion rate of Ca-10 sorbent was 72%.Finally,the modified calcium-based sorbents successfully reduced the CO_(2)concentration of the pyrolysis gas from 37%to 5%.

关键词： Pyrolysis gas CO_(2)capture Co-precipitation CaO-based sorbents Modified sorbents

张小萍从脾胃气化论治胆汁反流性胃炎临证经验

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江西中医药 2024年第1期55卷 37-39页

作者：徐翠何雪琴吴春城张小萍江西中医药大学研究生院南昌330004 江西中医药大学附属医院南昌330006

胆汁反流性胃炎是消化系统常见病之一,张小萍针对胆汁反流性胃炎提出从脾胃气化切入,认为本病根本病机在于脾胃气化失常,气机逆乱上犯。张小萍根据病因病情主次不同分脾虚湿阻、肝胃不和、胆腑郁热、寒热错杂四型论治,以调护脾胃为主,... 详细信息

胆汁反流性胃炎是消化系统常见病之一,张小萍针对胆汁反流性胃炎提出从脾胃气化切入,认为本病根本病机在于脾胃气化失常,气机逆乱上犯。张小萍根据病因病情主次不同分脾虚湿阻、肝胃不和、胆腑郁热、寒热错杂四型论治,以调护脾胃为主,燥湿化痰、疏肝和胃、利胆消胀、平调寒热等为辅,旨在恢复脾胃气化功能。遣方用药上,善于并用经方时方,临证化裁而成张氏益胃汤、张氏胃炎方、张氏利胆消胀汤、张氏降逆汤等,疗效显著。

关键词：胆汁反流张小萍脾胃气化临证经验

Widespread glacier advances across the Tian Shan during Marine Isotope Stage 3 not supported by climate-glaciation simulations

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Fundamental Research 2023年第1期3卷 102-110页

作者： Qing Yan Lewis A.Owen chuncheng Guo Zhongshi zhang Jinzhe zhang Huijun Wang Nansen-Zhu International Research Centre Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China Key Laboratory of Meteorological Disaster/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters Nanjing University of Information Science and TechnologyNanjing 210044China Department of Marine Earthand Atmospheric ScienceNorth Carolina State UniversityRaleighNC 27695United States NORCE Norwegian Research Centre Bjerknes Centre for Climate ResearchBergenNorway Department of Atmospheric Science School of Environmental StudiesChina University of GeosciencesWuhan 430074China

Whether there were more extensive glaciations during the Marine Isotope Stage(MIS)3 relative to MIS 2 across the Tian Shan in Central Asia is intensely debated because of the uncertainty in chronological data and fully understanding the driving *** help resolve the ongoing debate,we assess the climate sensitivity of the glaciers and reconstruct the extent of glaciation during MIS 2 and 3 across the Tian Shan,using a glacier-resolving(250×250 m)ice sheet model asynchronously coupled with a global climate *** results demonstrate that the equilibrium-line altitude(ELA)over the Tian Shan decreases by∼180 m for every 1°C cooling under a modern precipitation regime,but precipitation reduction greatly lowers the sensitivity of the glaciers to temperature decrease(e.g.,the effect of 2°C cooling is broadly offset by a 50%decrease in precipitation).Under the modeled colder/drier-than-present climate,the model predicts an ELA depression(∆ELA)of∼75 m(162 m)over the Tian Shan during MIS 3 interstadials(stadials).The extent of MIS 3 glaciation is much smaller than that during MIS 2(i.e.,∆ELA=∼726 m).The more extensive glaciation during MIS 2 is largely attributed to the enhanced summer ***,through a site-to-site model-data comparison,we find that the closest match between the modeled glacier margin and the locations of the glacial deposits previously argued to be MIS 3 is generally achieved under MIS 2 climatic *** results suggest more extensive glacier advances over the Tian Shan during MIS 2 than MIS 3 on a regional scale,although MIS 3 glaciation may still occur in individual glacier *** pattern suggests general synchronicity with the timing of maximum Northern Hemisphere ice sheets during the last glacial,which should be further tested in a multimodel framework in the future.

关键词： Glacier modeling Glacier sensitivity MIS 3 MIS 2 Tian Shan Paleoclimate modeling