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Effect of thermal exposure on precipitation behavior and hardness of alloy 718

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中国有色金属学会会刊：英文版 2000年第3期10卷 340-344页

作者：耿林郑镇洙 na Yong-Sang Park Nho-Kwang School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001P.R.China Korea Institute of Machinery and Materials 66 Sangnamd

The precipitation and grain growth behavior during isothermal treatment of hot extruded alloy 718 was investigated. It is found that the hardness of the hot extruded alloy 718 increases with holding time at 600～700 ℃, but slightly decreases at 800 ℃. When the exposure temperature reaches above 900 ℃, a rapid decrease in hardness of alloy 718 occurs before the holding time of 0.3 h. Above the δ solvus temperature, γ ′ and γ ″ phases are dissolved directly into the matrix without δ precipitation, resulting in a rapid grain growth.

关键词： precipitation grain growth superalloys isothermal treatment

Biopolymer-Based Aerogels for Electromagnetic Wave Shielding and Absorbing

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Chinese Journal of Chemistry 2023年第3期41卷 322-334页

作者： Mingrui Han Runa Zhang Qilei Wu na Wu Jiurong Liu Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials Ministry of Education and School of Materials Science and EngineeringShandong UniversityJinanShandong250061 China Science and Technology on Electromagnetic Compatibility Laboratory China Ship Development and Design CentreWuhanHubei430064 China Department of Chemistry and Applied Biosciences ETH ZurichCH-8093 ZurichSwitzerland

The rapid development of communication technology and electronic industry has brought unprecedented serious electromagnetic interference(EMI)and electromagnetic wave(EMW)*** EMI shields and EMW absorbers based on metal or magnetic materials were used to solve these problems,they have long been criticized for their high price,high density and easy *** order to achieve low density and efficient dissipation of electromagnetic energy,aerogels stand out among manifold ***,constructing aerogels with good EMI shielding or EMW absorption performance and acceptable mechanical properties is not an easy *** biopolymers,such as cellulose,lignin,chitin/chitosan and alginate,breathe new life into aerogels for high-efficiency EMW shielding and ***,we reviewed the contributions of biopolymers in the fields of aerogels for EMW shielding and *** the same time,some challenges and outlook were also pointed out,aiming to promote the advance of aerogel-based EMI shields and EMW absorbers as well as the rational utilization of biopolymers.

关键词： Polymers Sustainable chemistry Electromagnetic interference(EMI)shielding Electromagnetic wave(EMW)absorbing Biomass Aerogels Biopolymers

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基于贝叶斯网络评价中医药疗效思路与方法

中国中西医结合杂志 2024年第4期44卷 486-491页

作者：甘叶娜李多多梁少伟陈可冀刘建平北京中医药大学东直门医院推拿疼痛科北京100700 深圳市人工智能与机器人研究院深圳518129 中国中医科学院西苑医院心血管病中心北京100091 北京中医药大学循证医学中心北京100029

中医药疗效评价研究是推动中医药现代化、国际化发展的重要内容,但通过现有疗效评价方法常难以表示和呈现真实世界研究证据间潜在的因果关联。贝叶斯网络可利用网络来解析场景中潜在的因果关联,并对其进行动态更新,若能运用此方法来表... 详细信息

中医药疗效评价研究是推动中医药现代化、国际化发展的重要内容,但通过现有疗效评价方法常难以表示和呈现真实世界研究证据间潜在的因果关联。贝叶斯网络可利用网络来解析场景中潜在的因果关联,并对其进行动态更新,若能运用此方法来表示和呈现中医药诊疗研究证据,将有望从因果关联视角更清晰地了解、说明和评价中医药临床疗效的研究证据。

关键词：中医药疗效评价贝叶斯网络临床研究方法真实世界研究证据

数字创新能力对农业价值链变革的影响——基于两家农业企业的案例研究

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管理案例研究与评论 2024年第2期17卷 242-262页

作者：侯娜张靖怡赵婉争常红郝越刘雯雯北京林业大学经济管理学院北京100083 河北大学经济学院保定071000 北京师范大学经济与工商管理学院北京100875

数字化是产业升级的切入点,农业企业应该借助数字化来优化传统农业,进而完成农业价值链的升级与再造。基于数字创新能力与农业价值链变革理论,选取认养一头牛和丰农控股两家农业企业作为研究对象,通过构建融合数字创新能力与农业价值链... 详细信息

数字化是产业升级的切入点,农业企业应该借助数字化来优化传统农业,进而完成农业价值链的升级与再造。基于数字创新能力与农业价值链变革理论,选取认养一头牛和丰农控股两家农业企业作为研究对象,通过构建融合数字创新能力与农业价值链变革的综合分析框架,深入揭示企业数字创新能力驱动农业价值链变革的机制。研究发现,数字创新能力作为企业的“二阶”能力,会根据不同目标适应性部署,且以活动增值、架构重组、逻辑重塑为表现形式的微观机制能够推动农业价值链变革,实现渐进性和突破性的辩证统一。研究结论可为数字创新能力和价值链变革问题提供新的解释框架和思路,也可为数字化情境下企业推动农业价值链变革实践提供有效路径和理论指导。

关键词：数字创新能力农业价值链变革案例研究

In situ synthesis of red fluorescent gold nanoclusters with enzyme-like activity for oxidative stress amplification in chemodynamic therapy

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Chinese Chemical Letters 2022年第3期33卷 1331-1336页

作者： Wenying Mi Shuang Tang Shaoshi Guo Hejing Li na Shao College of Chemistry Beijing Normal UniversityBeijing 100875China

Chemodynamic therapy (CDT) has attracted tremendous interest in cancer therapy because it is independent of oxygen and photoirradiation. However, the therapeutic efficacy of CDT is restricted by insufficient H_(2)O_(2) levels in tumor cells. Herein, employing endogenous GSH as a template and cationic polymeric chitosan (CS) as crosslinker and stabilizer exhibiting easy cell uptake, red luminescent gold nanoclusters (denoted CS-GSH@AuNCs) were successfully synthesized in HeLa cells. The in situ synthesized CS-GSH@AuNCs exhibited both superoxidase dismutase (SOD) and peroxidase (POD)-like activity, which could promote the production of H_(2)O_(2) from superoxide anion radicals (O_(2)^(·-)) and then ^(·)OH. The combination of GSH elimination and H_(2)O_(2) elevation boosted the generation of ^(·)OH, which could trigger cancer cell apoptosis and death. The enzyme-like activity of CS-GSH@AuNCs could be effectively activated under acidic conditions, and showed a high killing effect on tumor cells but minimal toxicity to normal cells. The developed GSH consumption and ^(·)OH promotion theranostic platform is an innovative route for enhanced CDT by the amplification of oxidative stress.

关键词： Chemodynamic therapy In situ synthesis Gold nanoclusters Superoxidase dismutase and peroxidase(POD)-like activity Oxidative stress amplification

Integrative proteomic-transcriptomic analysis revealed the lifestyles of Lactobacillus paracasei H4-11 and Kluyveromyces marxianus L1-1 under co-cultivation conditions

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Food Science and Human Wellness 2023年第6期12卷 2195-2210页

作者： na Liu Likang Qin Haiying Zeng Anyan Wen Song Miao School of Liquor and Food Engineering Guizhou UniversityGuiyang 550025China Key Laboratory of Plant Resource Conservation and Germplasm Innovation in Mountainous Region(Ministry of Education) Collaborative Innovation Center for Mountain Ecology&Agro-Bioengineering(CICMEAB)College of Life Sciences/Institute of Agro-bioengineeringGuizhou UniversityGuiyang 550025China Teagasc Food Research Centre MooreparkFermoyP61 C996 Co.CorkIreland

Compared with the rice-acid soup inoculated with single starter,the synergistically intensifi ed rice-acid soup inoculated with Lactobacillus paracasei H4-11(*** H4-11)and Kluyveromyces marxianus L1-1(*** L1-1)contained more fl avor *** acids mainly included L-lactic acid and the main volatile fl avor component was ethyl ***,the signal intensity of astringency and bitterness and the total concentration of volatile sulfur compounds were *** combined analysis results of Rna sequencing(Rna-seq)technology and 4D label-free quantitative(4D LFQ)proteomics explained the fl avor formation pathways in rice-acid soup inoculated with *** H4-11 and *** *** *** H4-11,L-lactate dehydrogenase,phosphoglucomutase,acetate kinase,alcohol dehydrogenase and acetyl-CoA were up-regulated and D-lactate dehydrogenase and N-Acetyltransferase were *** *** L1-1,Acetyl-CoA,acetaldehyde dehydrogenase,acyl-coenzyme A,N-acetyltransferase,and L-lactate dehydrogenase were up-regulated and hexokinase,alcohol dehydrogenase,and alcohol O-acetyltransferase were *** above up-regulation and down-regulation synergistically promoted the formation of characteristic fl avor compounds(mainly L-lactic acid and ethyl acetate).Enzyme-linked immunoassay(ELISA)and parallel reaction monitoring(PRM)quantitative analysis respectively verifi ed that 5 key metabolic enzymes and 27 proteins in *** H4-11 and *** L1-1 were associated with the characteristic fl avor of rice-acid soup,as confi rmed by the quantitative results of 4D LFQ.

关键词： Lactobacillus paracasei Kluyveromyces marxianus Proteomic-transcriptomic Lifestyles Rice-acid soup

Ocean surface current retrieval and imaging with a new shore-based X-band radar based on time-shifted up-and-down linear frequency modulated signal

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Acta Oceanologica Sinica 2021年第3期40卷 112-121页

作者： Yijun He Xin Song Baochang Liu na Yi Xiuzhong Li School of Marine Sciences Nanjing University of Information Science and TechnologyNanjing 210044China Laboratory for Regional Oceanography and Numerical Modeling Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266237China

This paper proposes a multifunction radar that can not only measure sea currents but also perform sea-surface *** fundamental aspect of the proposed radar comprises transmitting time-shifted up-and-down continuous wave linear frequency modulated signals that allow for the offset of two one-dimensional range images of the sea surface that respectively correspond to the upward linear frequency modulated(LFM)signal and the downward LFM *** to the Doppler frequency shift from the sea surface,a range offset,which is proportional to the radial velocity of the sea surface,occurs between the upward and downward LFM *** using the least-squares linear fitting method in the transformed domain,the range offset can be measured and the current velocity can be ***,we verify the accuracy of current measurement with simulation results.

关键词： shore-based radars signal processing ocean surface currents up-and-down CWLFM

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轻型汽油车NH_(3)排放研究

汽车工程 2024年第3期46卷 483-488页

作者：方娜陈涛管永超方勇万建刘成田颖秦建宾王小涛康文霞东风汽车集团有限公司技术中心武汉430058

研究了某1.5T SUV车不同排放测试循环(WLTC与CLTC)和催化剂不同状态(新鲜和老化)对NH_(3)排放的影响。通过试验研究表明:发动机原始NH_(3)排放量很低,而经过第一块三元催化剂后,NH_(3)排放量大幅增加。催化剂老化后OSC降低,内部空燃比... 详细信息

研究了某1.5T SUV车不同排放测试循环(WLTC与CLTC)和催化剂不同状态(新鲜和老化)对NH_(3)排放的影响。通过试验研究表明:发动机原始NH_(3)排放量很低,而经过第一块三元催化剂后,NH_(3)排放量大幅增加。催化剂老化后OSC降低,内部空燃比波动幅度大,经过老化催化剂的NH_(3)排放相对新鲜催化剂的NH_(3)排放有所增加。催化剂状态、排放测试循环和发动机空燃比等对NH_(3)排放有明显影响,这些对于催化剂设计和标定优化均有指导意义。

关键词： NH_(3)排放三元催化剂排放循环空燃比

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慢性萎缩性胃炎规范化治疗效果分析

中国标准化 2024年第12期 257-260页

作者：赵涵丁娜商振宁吉林省四平市中心人民医院

目的:分析消化内科临床规范化治疗应用于慢性萎缩性胃炎的效果。方法:选取吉林省四平市中心人民医院于2023年1月至12月期间收治的80例慢性萎缩性胃炎患者为研究对象,对照组采用常规治疗,观察组采用规范化治疗,根据病情选用替普瑞酮联合... 详细信息

目的:分析消化内科临床规范化治疗应用于慢性萎缩性胃炎的效果。方法:选取吉林省四平市中心人民医院于2023年1月至12月期间收治的80例慢性萎缩性胃炎患者为研究对象,对照组采用常规治疗,观察组采用规范化治疗,根据病情选用替普瑞酮联合雷贝拉唑钠开展药物治疗,对比两组患者在治疗期间的各项指标。结果:治疗后,患者的临床指标均得到有效改善,其中观察组患者治疗有效率、幽门螺杆菌清除率以及转阴、复发率均优于对照组患者,数据差异明显(P<0.05)。结论:使用替普瑞酮联合雷贝拉唑钠进行规范化药物治疗,能够有效改善患者体内幽门螺杆菌数量,提高整体治疗有效率。

关键词：消化内科临床规范化治疗慢性萎缩性胃炎雷贝拉唑钠替普瑞酮