检索结果-南通市图书馆

Effect of slow shot speed on externally solidified crystal,porosity and tensile property in a newly developed high-pressure die-cast Al-Si alloy

在线全文

学校读者我要写书评

暂无评论

China Foundry 2024年第1期21卷 11-19页

作者： Wen-ning Liu Wei Zhang Peng-yue Wang Yi-xian Liu Xiang-yi Jiao Ao-xiang Wan Cheng-gang Wang Guo-dong tong Shou-mei Xiong School of Materials Science and Engineering Tsinghua UniversityBeijing 100084China Key Laboratory for Advanced Materials Processing Technology Tsinghua UniversityBeijing 100084Beijing China FAW Group Co. Ltd.Changchun 130013China China FAW Foundry Co. Ltd.Changchun 130013China

The effect of slow shot speed on externally solidified crystal(ESC),porosity and tensile property in a newly developed high-pressure die-cast Al-Si alloy was investigated by optical microscopy(OM),scanning electron microscopy(SEM)and laboratory computed tomography(CT).Results showed that the newly developed AlSi9MnMoV alloy exhibited improved mechanical properties when compared to the AlSi10MnMg *** AlSi9MnMoV alloy,which was designed with trace multicomponent additions,displays a notable grain refining effect in comparison to the AlSi10MnMg *** elements Ti,Zr,V,Nb,B promote heterogeneous nucleation and reduce the grain size of primaryα-*** a lower slow shot speed,the large ESCs are easier to form and gather,developing into the dendrite net and *** an increase in slow shot speed,the size and number of ESCs and porosities significantly *** addition,the distribution of ESCs is more dispersed and the net-shrinkage *** tensile property is greatly improved by adopting a higher slow shot *** ultimate tensile strength is enhanced from 260.31 MPa to 290.31 MPa(increased by 11.52%),and the elongation is enhanced from 3.72%to 6.34%(increased by 70.52%).

关键词： hypoeutectic Al-Si alloy high pressure die casting porosity externally solidified crystal tensile property

Solar observation with the Fourier transform spectrometer Ⅰ:Preliminary results of the visible and near-infrared solar spectrum

在线全文

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2021年第10期21卷 257-267页

作者： Xian-Yong Bai Zhi-Yong Zhang Zhi-Wei Feng Yuan-Yong Deng Xing-Ming Bao Xiao Yang Yong-Liang Song Li-yue tong Shuai Jing Key Laboratory of Solar Activity National Astronomical ObservatoriesChinese Academy of SciencesBeijing 100101China School of Astronomy and Space Science University of Chinese Academy of SciencesBeijing 101408China

The Fourier transform spectrometer(FTS)is a core instrument for solar observation with high spectral resolution,especially in the *** Infrared System for the Accurate Measurement of Solar Magnetic Field(AIMS),working at 10-13μm,will use an FTS to observe the solar *** Bruker IFS-125 HR,which meets the spectral resolution requirement of AIMS but simply equips with a point source detector,is employed to carry out preliminary experiment for AIMS.A sun-light feeding experimental system is further *** experiments are taken with them during 2018 and 2019 to observe the solar spectrum in the visible and near infrared wavelength,*** also proposed an inversion method to retrieve the solar spectrum from the observed interferogram and compared it with the standard solar spectrum *** there is a wavelength limitation due to the present sun-light feeding system,the results in the wavelength band from 0.45-1.0μm and 1.0-2.2μm show a good consistency with the solar spectrum atlas,indicating the validity of our observing configuration,the data analysis method and the potential to work in longer *** work provided valuable experience for the AIMS not only for the operation of an FTS but also for the development of its scientific data processing software.

关键词： Sun:general methods:observational instruments:Fourier transform spectrometer

Intrapartum and early postpartum glycemic profiles in women with gestational diabetes mellitus:an observational study

在线全文

学校读者我要写书评

暂无评论

Chinese Medical Journal 2022年第21期135卷 2547-2553页

作者： Yu Ding Xueying Zheng Yujie Liu Tian Wei tong yue Siqi Wang Suyu Chen Jianping Weng Sihui Luo Department of Endocrinology The First Affiliated Hospital of USTCDivision of Life Sciences and MedicineUniversity of Science and Technology of ChinaHefeiAnhui 230001China Department of Obstetrics and Gynecology The First Affiliated Hospital of USTCDivision of Life Sciences and MedicineUniversity of Science and Technology of ChinaHefeiAnhui 230001China Institute of Endocrine and Metabolic Diseases The First Affiliated Hospital of USTCDivision of Life Sciences and MedicineUniversity of Science and Technology of ChinaHefeiAnhui 230001China

Background: Data on the glycemic profile of pregnant women with gestational diabetes mellitus (GDM) during the perinatal period are sparse. This study described the intrapartum and early postpartum glucose profiles among pregnant women with GDM, and analyzed factors potentially affecting glycemic parameters during the ***: This was a prospective observational study conducted from March 2020 to November 2021. Pregnant women with GDM receiving lifestyle interventions alone during pregnancy and matched women with non-diabetic pregnancies (NDPs) were enrolled from among patients admitted to the obstetrics department for childbirth. Glucose monitoring was performed via a flash glucose monitoring (FGM) system on admission, and glucose readings during labor and early postpartum were analyzed. The clinical characteristics and FGM-based parameters of participants in the two groups were ***: A total of 124 participants (mean age: 29.5 ± 3.5 years, 92 [74.2%] primipara) were included in the final analysis. A total of 17,571 glucose readings were retrieved. There were no significant differences in clinical characteristics between the GDM (n = 60) and NDP (n = 64) groups. The average glucose level was 92.2 mg/dL, and the level was higher in the GDM group (95.5 ± 12.1 mg/dLvs. 89.1 ± 13.4 mg/dL,P = 0.008) during the intrapartum and early postpartum periods. The data were split into the intrapartum period (from the start of labor to delivery of the placenta) and the early postpartum period (within 24 h after placental delivery) for analysis. During intrapartum, women with GDM exhibited glycemic profiles and fluctuations similar to those in the NDP group. However, women with GDM had higher postpartum glucose levels (97.7 ± 13.4 mg/dLvs. 90.8 ± 15.3 mg/dL,P = 0.009), a longer time spent >140 mg/dL (8.7 ± 9.3%vs. 5.9 ± 10.3%,P = 0.011), and greater glycemic fluctuations than those with NDP. Postpartum hyperglycemia in GDM might be associated with high parity a

关键词： Blood glucose Flash glucose monitoring Gestational diabetes mellitus Glycemic profiles

在线全文

学校读者我要写书评

暂无评论

推进新时代中国社区心理学新形态建设

心理与行为研究 2023年第1期21卷 7-11,101页

作者：岳童陈红西南大学心理学部西南大学心理学与社会发展中心重庆400715

建设中国特色的社区心理学是时代的呼唤和要求。在党的二十大精神指引下,新时代中国社区心理学需要坚持中国化时代化的马克思主义为指导以推进理论建设;以新时代社区心理建设为场域,助力社会主义核心价值观培育;构建新时代中国社区心理... 详细信息

建设中国特色的社区心理学是时代的呼唤和要求。在党的二十大精神指引下,新时代中国社区心理学需要坚持中国化时代化的马克思主义为指导以推进理论建设;以新时代社区心理建设为场域,助力社会主义核心价值观培育;构建新时代中国社区心理学服务路径,助推人民共同富裕。总体而言,中国特色社区心理学的理论建设与实践探索需要关注新时代社区发展中涌现出的新问题,提出解决中国社区发展问题的中国办法和中国方案,努力推进中国社区心理学新形态的建设。

关键词：党的二十大精神新时代中国社区心理学马克思主义中华优秀传统文化

超滤膜技术对黄芪水提物理化性质及其抗氧化活性的影响

在线全文

学校读者我要写书评

暂无评论

中国现代中药 2024年第4期26卷 695-701页

作者：王悦彤刘红波徐思宁唐志书宋忠兴刘欢史鑫波李国龙陕西中医药大学/陕西中药资源产业化省部共建协同创新中心陕西咸阳712083 秦药特色资源研究与开发国家重点实验室(培育)/陕西中药产业研究院陕西咸阳712083 陕西中医药大学附属医院陕西咸阳712000 中国中医科学院北京100700

目的:考察超滤膜技术对黄芪水提物理化性质及其抗氧化活性的影响。方法:采用截留相对分子质量分别为10、30、50kDa的超滤膜对黄芪水提物进行分离纯化处理,考察超滤膜技术对黄芪水提物的溶液理化性质、皂苷类成分保留性及其吸湿性、油水... 详细信息

目的:考察超滤膜技术对黄芪水提物理化性质及其抗氧化活性的影响。方法:采用截留相对分子质量分别为10、30、50kDa的超滤膜对黄芪水提物进行分离纯化处理,考察超滤膜技术对黄芪水提物的溶液理化性质、皂苷类成分保留性及其吸湿性、油水分配系数等的影响。同时,采用体外抗氧化实验考察超滤膜技术对黄芪水提物抗氧化活性的影响。结果:超滤膜技术可降低黄芪水提物溶液的浊度,显著改善溶液的澄明度。经不同超滤膜分离纯化处理后,黄芪水提物中黄芪甲苷保留率>90%,总皂苷类成分保留率>85%,其总皂苷纯度提高了14%~19%。超滤膜技术可降低黄芪水提物的吸湿性,提高其抗氧化活性,并影响其皂苷类成分的油水分配系数。综合考虑杂质去除、有效成分保留及抗氧化活性,30kDa超滤膜对黄芪水提物的分离纯化效果较好。结论:超滤膜技术提高了黄芪水提物中皂苷类成分含量,增强了其生物活性,为中药的分离纯化提供了一种途径。

关键词：黄芪超滤膜技术分离纯化理化性质抗氧化

Removal of AlN from secondary aluminum dross by pyrometallurgical treatment

在线全文

学校读者我要写书评

暂无评论

Journal of Central South University 2021年第2期28卷 386-397页

作者： WANG Jian-hui ZHONG Ye-qing tong yue XU Xun-lin LIN Gao-yong School of Materials Science and Engineering Central South UniversityChangsha 410083China Key Laboratory of Nonferrous Materials Science and Engineering(Ministry of Education) Central South UniversityChangsha 410083China

A new process of AlN removal from secondary aluminum dross(SAD)by pyrometallurgical treatment with added cryolite was applied for solving the problem of recycling the secondary aluminum *** response surface methodology(RSM)was used to design experiments and optimize *** results show that adding the appropriate amount of cryolite can effectively promote the oxidation of AlN in the SAD,and too much cryolite will reduce the promotion *** effects of roasting temperature and cryolite on the denitrification rate are the most significant(p<0.0001)followed by holding *** values of the denitrification rate are found to be in good agreement with experimental values(R^(2)=0.9894 and R_(adj)^(2)=0.9775),which confirms the validity of the model *** optimum conditions of roasting temperature of 750°C,holding time of 194 min,mass fraction of cryolite of 17.7%are obtained according to the quadratic *** these conditions,the maximum actual denitrification rate reaches 94.71%and the AlN content in the SAD is only 0.55 wt%.The unfired brick with compressive strength of 18.62 MPa(GB/T 2542−2012)was prepared based on the roasted SAD.

关键词： secondary aluminum dross(SAD) AlN pyrometallurgy treatment denitrification rate response surface methodology(RSM)

在线全文

学校读者我要写书评

暂无评论

认知神经研究中的积极共情

心理科学进展 2016年第3期24卷 402-409页

作者：岳童黄希庭西南大学心理学部重庆400715

积极共情指个体对他人积极情绪状态的理解和间接分享过程。虽然它与消极共情在产生过程中都依赖于镜像神经系统和心理理论系统的活动,但是两者在产生难度上不同。对于积极共情情感如何在大脑中表征的,不同的研究者观点各异:一些认为与... 详细信息

积极共情指个体对他人积极情绪状态的理解和间接分享过程。虽然它与消极共情在产生过程中都依赖于镜像神经系统和心理理论系统的活动,但是两者在产生难度上不同。对于积极共情情感如何在大脑中表征的,不同的研究者观点各异:一些认为与消极共情一致,都集中在脑岛及其相关脑区;而另一些则认为是大脑的愉悦系统。关于积极共情影响因素的研究主要集中于共情主体和客体的关系方面。今后需要进一步了解积极共情在产生机制和情感表征上的特点,拓展其影响因素的研究并展开对特质积极共情神经基础的探讨。

关键词：共情积极共情消极共情神经基础

在线全文

学校读者我要写书评

暂无评论

共情特质的神经生物学基础

心理科学进展 2016年第9期24卷 1368-1376页

作者：岳童黄希庭西南大学心理学与社会发展研究中心西南大学心理学部重庆400715

共情特质的个体差异是心理学研究领域中的一个重要主题。近些年来,研究者开始关注导致人们共情能力高低有别的神经生物学基础问题。研究发现,不论是情感共情特质还是认知共情特质,其个体差异均在大脑进行共情反应、脑结构态及静息态功... 详细信息

共情特质的个体差异是心理学研究领域中的一个重要主题。近些年来,研究者开始关注导致人们共情能力高低有别的神经生物学基础问题。研究发现,不论是情感共情特质还是认知共情特质,其个体差异均在大脑进行共情反应、脑结构态及静息态功能连接上有所体现。它们共同说明,人们的共情能力与其具身模仿能力,情感加工能力及情绪理解能力密切相关。不仅如此,共情特质也具有高度的可遗传性,一些基因类型与该能力存在着紧密的关系。在今后的研究中,需要扩展对共情特质结构的进一步认识,关注环境和基因在影响共情特质上存在的交互作用,并努力将理论研究成果应用于共情能力训练和提高的临床实践中。

关键词：共情特质脑机制脑结构静息态基因

在线全文

学校读者我要写书评

暂无评论

碳税征管的理论实践与策略选择

经济理论与经济管理 2023年第11期43卷 17-29页

作者：白彦锋岳童童健中央财经大学财政税务学院北京化工大学经济管理学院 102202

开征碳税是我国实现碳达峰、碳中和目标的要求所在,也是我国参与国际贸易谈判、取得国际话语权的重要抓手。本文明确了碳税在我国碳达峰、碳中和目标下,作为碳定价政策的“减碳”功能定位,并从与碳交易市场的对比分析中进一步明确了开... 详细信息

开征碳税是我国实现碳达峰、碳中和目标的要求所在,也是我国参与国际贸易谈判、取得国际话语权的重要抓手。本文明确了碳税在我国碳达峰、碳中和目标下,作为碳定价政策的“减碳”功能定位,并从与碳交易市场的对比分析中进一步明确了开征碳税的重要性;归纳总结了碳税税制设定的基本理论,税率设定问题形成了边际社会损害成本和动态税率定价理论,税制设定问题则形成了污染者付费定价原则;讨论了碳税的双重红利效果,并明确了实现双重红利既需要依靠绿色税制的变迁,又需要绿色财政政策配合;提出开征碳税的策略选择,结合各国碳税征管的实践和经验,提出以开征碳税为契机,构建并完善碳定价机制、碳减排复合机制和绿色财政体制等政策建议。

关键词：碳定价政策碳税碳交易市场绿色财税碳达峰与碳中和