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天津加快建设国际消费中心城市的价值意蕴、困境和关键策略

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天津商务职业学院学报 2024年第2期12卷 3-10页

作者：李名梁常馨月天津外国语大学“一带一路”天津战略研究院天津300204 天津外国语大学国际商学院天津300204

本文从国际消费中心城市的内涵及特征出发,分析天津市建设国际消费中心城市的重大价值,结合天津市居民消费水平和现状,指出天津市在建设国际消费中心城市时存在消费性服务业比重偏低,企业自主创新能力不足,居民收入水平偏低以及城乡收... 详细信息

本文从国际消费中心城市的内涵及特征出发,分析天津市建设国际消费中心城市的重大价值,结合天津市居民消费水平和现状,指出天津市在建设国际消费中心城市时存在消费性服务业比重偏低,企业自主创新能力不足,居民收入水平偏低以及城乡收入差距增加和营商环境有待优化等现实困境。基于上述问题,提出了提升新兴服务业的比重,加快产业结构转型升级;聚焦本地优质资源,培育消费新平台;加强研发资金投入,建设创新型人才队伍;提高居民收入水平,缩小城乡差距;打造高效透明的政务环境,创造公平开放的市场环境的策略建议,对于天津市加快建设国际消费中心城市具有重要借鉴意义。

关键词：天津国际消费中心城市价值意蕴现实困境策略

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刺五加籽氨基酸提取工艺及其水果配制酒研究

粮食与油脂 2024年第10期37卷 125-128页

作者：杜妍霖郝晓亮常欣月张文朋辽宁科技大学化学工程学院辽宁鞍山114051

以刺五加籽为原料,采用超声提取氨基酸,并以氨基酸提取液为基酒制备水果配制酒。在单因素试验的基础上,分别采用正交试验优化氨基酸提取工艺及水果配制酒配方。结果表明:最佳氨基酸提取工艺为刺五加籽粉添加量1.00 g、料液比1∶25(g/mL... 详细信息

以刺五加籽为原料,采用超声提取氨基酸,并以氨基酸提取液为基酒制备水果配制酒。在单因素试验的基础上,分别采用正交试验优化氨基酸提取工艺及水果配制酒配方。结果表明:最佳氨基酸提取工艺为刺五加籽粉添加量1.00 g、料液比1∶25(g/mL)、超声时间25 min,在此条件下氨基酸得率为6.36%。水果配制酒的最佳配方为苹果汁15 mL、糖水1.0 mL、柠檬汁2 mL、基酒5.0 mL,在此条件下水果配制酒的感官评分为21.30。

关键词：刺五加籽氨基酸提取工艺基酒

2002—2021年中国城乡居民尘肺病死亡率及其变化趋势

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现代预防医学 2024年第14期51卷 2541-2547页

作者：常馨月徐小诺丁宁何静葛晓燕崔凯锦州医科大学公共卫生学院锦州医科大学医疗学院

目的分析2002—2021年中国居民尘肺病死亡率变化趋势、影响因素及其在城市与农村人口间的差异。方法采用国家统计局年鉴数据，通过Joinpoint模型分析中国城乡居民尘肺病粗死亡率及标化死亡率，计算年度变化百分比(APC)和平均年度变化... 详细信息

目的分析2002—2021年中国居民尘肺病死亡率变化趋势、影响因素及其在城市与农村人口间的差异。方法采用国家统计局年鉴数据，通过Joinpoint模型分析中国城乡居民尘肺病粗死亡率及标化死亡率，计算年度变化百分比(APC)和平均年度变化百分比(AAPC)。通过年龄—时期—队列模型，分析三种效应对尘肺病死亡率变化的影响。结果城市标准化死亡率整体呈下降趋势(APC=-0.2%,P>0.05),农村2004—2021年呈上升趋势(APC=7.9%,P<0.001)。年龄效应显示城乡尘肺病死亡率均随年龄增高而增大。时期效应随时间增加，且在城乡间有不同表现，城市死亡风险呈下降趋势，农村死亡风险呈上升趋势。队列效应显示，城市居民出生越晚死亡风险越低，农村居民出生队列呈波动趋势。结论年龄、时期、队列效应的增加对农村尘肺病死亡率的影响高于城市。

关键词：尘肺病死亡率年龄—时期—队列模型

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磁共振成像技术应用于针灸治疗的研究进展

时珍国医国药 2024年第2期35卷 429-431页

作者：仲思潼吕晓琳朱瑾怡杨成妍常新玥殷建涛孙忠人尹洪娜黑龙江中医药大学研究生院黑龙江哈尔滨150006 黑龙江中医药大学附属第二医院黑龙江哈尔滨150001

目前,针灸被广泛应用于临床治病及预防保健中,已经成为独特的治疗体系,然而,国际医学界对针灸疗效的认可度仍然存在争议,如何客观、科学探讨针灸治疗量化与标准化是近几年针灸领域中的研究焦点。磁共振成像技术作为现代科学技术,不仅能... 详细信息

目前,针灸被广泛应用于临床治病及预防保健中,已经成为独特的治疗体系,然而,国际医学界对针灸疗效的认可度仍然存在争议,如何客观、科学探讨针灸治疗量化与标准化是近几年针灸领域中的研究焦点。磁共振成像技术作为现代科学技术,不仅能显示微观形态结构及其功能变化为中医针灸学提供清晰客观的临床信息和可视化依据,亦可反映针灸治疗与中枢系统之间的联系以证实针灸治疗学具有科学性,为推动针灸现代化研究进展作出巨大贡献。文章通过整理磁共振成像技术应用于反映针灸治疗效应、针刺手法量学、针灸治病效应机制3个方面以总结其应用优势,探索出提高针灸疗效的新目标与新方法。

关键词：针灸治疗磁共振成像技术预防机制研究进展

Improvement for creep strength of a second-generation single crystal superalloy by design of heat treatments

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Rare Metals 2024年第1期43卷 342-350页

作者： Wan-Shun Xia xin-Bao Zhao Jia-Chen Xu Quan-Zhao yue Qing-Qing Ding Huan-chang Duan yue-Feng Gu Hong-Bin Bei Ze Zhang Institute of Superalloys Science and Technology School of Materials Science and EngineeringZhejiang UniversityHangzhou 310027China State Key Laboratory of Silicon and Advanced Materials School of Materials Science and EngineeringZhejiang UniversityHangzhou 310027China

Design of heat treatments is related to the key technology for development of nickel-based single crystal superalloys(Ni-SXs). Based on the full understanding of the solidification characteristics, this work applies optimization design of heat treatments for a second-generation Ni-SX. Microstructure evolution and creep properties are compared in the material under conventional/standard(Std.) and optimized(Opt.) treatments. For the Std. sample,strong dendritic segregations determine inconsistent microstructure evolution in the dendritic(D) and interdendritic region(ID), while the latter serves as weak area to have the prior microcrack initiation, damaging overall performance of the alloy. The Opt. treatment applies higher homogenization temperature, leading to overall reduced segregations, while not inducing incipient melting. A lower temperature of first-step ageing is used to lower the size ofγ'particles. These help to form the more uniform microstructure in dendritic and interdendritic region and relieve the inconsistent microstructure evolution. The balanced local strength makes ID no longer as the weak area,thus restricting microcrack initiation. Great improvement of high temperature and low stress property is obtained by this progress, leading to the pronounced increase of creep rupture life under 1100 °C/140 MPa.

关键词： Single crystal superalloy Heat treatment Segregation Solidification Creep property

Seed Dormancy and Seedlings Physiological Response to Topramezone in Green Foxtail(Setaria viridis)

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Journal of Northeast Agricultural University(English Edition) 2023年第4期30卷 32-42页

作者： Ding Wei chang xin-yue Cheng Zhuo Cheng Peng College of Plant Protection Northeast Agricultural UniversityHarbin 150030China College of Resources and Environmental Sciences Northeast Agricultural UniversityHarbin 150030China Agricultural Technology Extension Station of Heilongjiang Province Harbin 150010China

Green foxtail(Setaria viridis)is a notorious weed in corn fields in Heilongjiang *** investigate the best method to break the seed dormancy of green foxtail and its physiological response to topramezone,this study selected newly harvested and one-year stored green foxtail seeds as research *** seeds were treated with HCl,Na OH,gibberellic acid(GA),different water temperatures and polyethylene glycol(PEG)to study the seed dormancy and drought resistance of green *** results showed that newly harvested seeds exhibited dormancy,and treatments with HCl,NaOH and different water temperatures were unable to break the *** the seeds in GA could overcome dormancy,but the seeds failed to germinate when exposed to 25%PEG *** topramezone was applied at rates of 22.5 and 45.0 g a.i.·hm^(-2)at the 3-leaf and 5-leaf stages,respectively,the chlorophyll content reached the lowest value at 28 days after treatment(DAT).At the 7-leaf stage,the chlorophyll content reached the lowest value at 7 *** activity of 4-hydroxyphenylpy-ruvate dioxygenase(HPPD)enzyme after topramezone application reached the maximum value at 7 DAT for different leaf ages,and the higher the leaf age,the higher the HPPD activity,which was an important factor contributing to the resistance of green foxtail to topramezone.

关键词： green foxtail seed dormancy topramezone physiological response

Palladium-catalyzed multi components oxy-aminofluorination and aminofluorination of gem-difluoroalkenes

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Chinese Chemical Letters 2024年第2期35卷 420-425页

作者： Fen Wu xin Li Junbiao chang Dachang Bai State Key Laboratory of Antiviral Drugs NMPA Key Laboratory for Research and Evaluation of Innovative DrugKey Laboratory of Green Chemical Media and ReactionsMinistry of EducationSchool of Chemistry and Chemical EngineeringPingyuan LaboratoryHenan Normal UniversityXinxiang 453007China State Key Laboratory of Organometallic Chemistry Shanghai Institute of Organic ChemistryChinese Academy of SciencesShanghai 200032China

Organofluorine compounds are widely used in the realm of drug discovery and material ***,we developed palladium catalyzed intermolecular aminofluorination and oxy-aminofluorination of gem‑difluoroalkenes with N-fluorobenzenesulfonimide(NFSI),in which NFSI was used as the nitrogen source and *** reaction provides an efficient and straightforward synthesis route of a series ofα-trifluoromethyl benzylic ***,three/four components oxy-aminofluorination processes were realized to giveα-trifluoromethyl benzylic ether with a terminal amino group,which proceed through C(sp^(3))-O bond cleavage of easily available ether and simultaneous introduced a fluorine,an amino and an oxy substituent in one pot with excellent *** divergent reactivity not only included the incorporation of one ether molecular,but also much more challenged two ether insertion with excellent selectivity through succession C(sp^(3))-O bonds *** protocol allows for concise synthesis of high value amines with fluoroalkyl-substituents and selectively transformation of easily available ethers by high-valent palladium catalysis.

关键词： Palladium Multi components Aminofluorination Oxy-aminofluorination C(sp^(3))-O bond cleavage

Stage separation of recoverable liquid launch vehicle by using moving pulsating ball analogue for propellant sloshing

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Chinese Journal of Aeronautics 2024年第2期37卷 360-370页

作者： Yu LU Baozeng yue Bailong HAO Bole MA Feng LIU Yuanyuan chang School of Aerospace Engineering Beijing Institute of TechnologyBeijing 100081China Beijing Institute of Astronautical Systems Engineering Beijing 100076China

In the process of stage separation of recoverable liquid launch vehicles,because of the large amount of residual fuel in the storage tanks,the influence of liquid sloshing on separation safety must be *** calculation simplicity and operation practicability,the Moving Pulsating Ball Model(MPBM)of large amplitude liquid sloshing is introduced into the calculation of launch vehicle stage *** the dynamic equation of the model with the energy relationship during"breathing movement",the formula calculating the force of liquid on the rigid body is *** with the calculations of commercial CFD calculation software,the accuracy of MPBM model is ***,all the external forces and moments are applied to the rigid body of the stages,so that the translational and rotational dynamic equations of the stages are obtained *** to the relative position of the two stages,the geometric shape of the interstage section and the engine of the second stage,the minimum clearance in the separation process can be decided to guarantee that the separation process is safe.

关键词： Moving Pulsating Ball Model(MPBM) Dynamics of stage separation Large amplitude sloshing Recoverable liquid launch vehicle Flight dynamics

A systematic evaluation of computational methods for predicting translated non-canonical ORFs from ribosome profiling data

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Journal of Genetics and Genomics 2024年第1期51卷 105-108页

作者： Tianyu Lei yue chang Chao Yao Hong Zhang College of Ecology Lanzhou UniversityLanzhouGansu 730000China Cuiying Honors College Lanzhou UniversityLanzhouGansu 730000China

Ribosome profiling(Ribo-Seg)enables genome-wide survey of translational activities at nucleotide resolution by enriching and sequencing ribosome-protected fragments(RPFs)in the cell(Ingolia et al.,2009).Based on the characteristic distribution of RPFs in Ribo-Seq,such as enrichment in open reading frames(ORFs)and three-nucleotide periodicity,many computational methods have been developed to detect translated ORFs from Ribo-Seq data(Wang et al.,2020a).

关键词： translated enable canonical