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Method for rapid warning and activity concentration estimates in online waterγ-spectrometry systems

Nuclear Science and Techniques 2024年第3期35卷 1-12页

作者： Meng Wang Yi Gu Mao-Lin Xiong Liang-Quan Ge Qing-xian Zhang Guo-Qiang Zeng Heng Lu Sheng-Liang Guo College of Nuclear Technology and Automation Engineering Chengdu University of TechnologyChengdu 610059China Applied Nuclear Technology in Geosciences Key Laboratory of Sichuan Province (Chengdu University of Technology)Chengdu 610059China Chengdu New Ray Technology Co.Ltd Chengdu 610052China

Onlineγ-spectrometry systems for inland waters,most of which extract samples in situ and in real time,are able to produce reliable activity concentration measurements for waterborne radionuclides only when they are distributed relatively uniformly and enter into a steady-state diffusion regime in the measurement *** protect residents’health and ensure the safety of the living environment,better timeliness is required for this measurement *** address this issue,this study established a mathematical model of the online waterγ-spectrometry system so that rapid warning and activity estimates can be obtained for water under non-steady-state(NSS)*** addition,the detection efficiency of the detector for radionuclides during the NSS diffusion process was determined by applying the computational fluid dynamics technique in conjunction with Monte Carlo *** this basis,a method was developed that allowed the online waterγ-spectrometry system to provide rapid warning and activity concentration estimates for radionuclides in *** analysis of the NSS-mode measurements of^(40)K radioactive solutions with different activity concentrations determined the optimum warning threshold and measurement time for producing accurate activity concentration estimates for *** experimental results show that the proposed NSS measurement method is able to give warning and yield accurate activity concentration estimates for radionuclides 55.42 and 69.42 min after the entry of a 10 Bq/L^(40)K radioactive solution into the measurement chamber,*** times are much shorter than the 90 min required by the conventional measurement ***,the NSS measurement method allows the measurement system to give rapid(within approximately 15 min)warning when the activity concentrations of some radionuclides reach their respective limits stipulated in the Guidelines for Drinking-water Quality of the WHO,suggesting that this method con

关键词： Water radioactivity monitoring Dynamic detection efficiency Rapid warning Activity estimation

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Fluoro-functionalized plant biomass adsorbent:Preparation and application in extraction of trace perfluorinated compounds from environmental water samples

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Journal of Environmental Sciences 2024年第3期137卷 703-715页

作者： Xi Tan Yan Shi Chun-Feng Ma Quan Chi Yu-Hang Yang Wen-xiang Zhang Hua-ming Xiao xian Wang Key Laboratory of Analytical Chemistry of the State Ethnic Affairs Commission School of Chemistry and Materials ScienceSouth-Central Minzu UniversityWuhan 430074China School of Pharmaceutical Sciences South-Central Minzu UniversityWuhan 430074China Key Laboratory of Oilseeds Processing of ministry of Agriculture Hubei Key Laboratory of Lipid Chemistry and NutritionOil Crops Research Institute of the Chinese Academy of Agricultural SciencesWuhan 430062China

Perfuorinated compounds(PFCs)are toxic and widely present in the environment,and therefore effective adsorbents are required to remove PFCs from environmental *** the present study,a new type of fuorinated biomass materials was synthesized via an ingenious fuorosilanization *** adsorbents were applied for the adsorption of 13typical PFCs,including perfuorocarboxylic acids(PFCAs)and perfuorosulfonic acids(PFSAs).By comparing their adsorption performance,Fluorinated cedar slag(FCS)was discovered to have the best absorption efficiency and enabled highly efficient enrichment of *** adsorption recovery of FCS with the investigated PFCs is greater than 90%under the optimal adsorption *** to the high affinity of F-F sorbent-sorbate interaction,FCS had good adsorption capacities of PFCs from aqueous solution,with the maximum adsorption capacity of 15.80 mg/g for PFOS and 10.71 mg/g for PFOA,***,the adsorption time could be achieved in a short time(8 min).Using the FCS absorbent,an innovative FCS-solid phase extraction assisted with high performance liquid chromatography-electrospray-tandem mass spectrometry(FCS-SPE-HPLC-ESI-MS/MS)method was first developed to sensitively detect PFCs in the environmental water *** intra-day and inter-day recovery rates of the 13 compounds ranged from 90.7%-104.3%,with the RSD of 2.1%-4.7%(intra-day)and 2.5%-8.5%(inter-day),*** research demonstrates the potential of the newly fuoro-functionalized plant biomass to adsorb PFCs from environmental water,with the advantages of high adsorption efficiencies,high antiinterference,easy operation and low economic cost.

关键词： Fluoro-functionalized biomass Perfuorinated compounds(PFCs) Adsorption efficiency Mass spectrometry(MS) Fluorinated cedar slag(FCS)

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光伏电场对大容量体全息存储的影响与抑制

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中国激光 2003年第8期30卷 713-716页

作者：刘国栋何庆声李晓春金洪震王建岗邬敏贤金国藩清华大学精密仪器与测量国家重点实验室北京100084

Fe∶LiNbO3 晶体有很强的光伏效应。通过理论分析和实验验证 ,在全息存储过程中 ,光伏效应会在晶体表面产生非均匀的光伏直流电场 ,它不仅降低了材料的动态范围 ,并且引起了Bragg失配 ,使得再现图像失真。消除光伏直流电场的方法是使用... 详细信息

Fe∶LiNbO3 晶体有很强的光伏效应。通过理论分析和实验验证 ,在全息存储过程中 ,光伏效应会在晶体表面产生非均匀的光伏直流电场 ,它不仅降低了材料的动态范围 ,并且引起了Bragg失配 ,使得再现图像失真。消除光伏直流电场的方法是使用电解质溶液短路晶体表面电荷。采用这种方法 ,在晶体一个公共区域内 ,可存储 1 0 0

关键词：信息光学大容量体全息存储光伏效应光伏电场光折变晶体

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Study on the efficacy of early treatment with pirfenidone on the lung function of patients with idiopathic pulmonary fibrosis

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World Journal of Clinical Cases 2024年第22期12卷 4913-4923页

作者： Ying Lei Jian-Hui Sheng Xu-Ru jin xian-Bing Liu Xiao-Yan Zheng Xiao-Hua Xu Department of Pulmonary and Critical Care Medicine The Quzhou Affiliate Hospital of Wenzhou Medical UniversityQuzhou 324000Zhejiang ProvinceChina Department of Clinical Laboratory The Quzhou Affiliate Hospital of Wenzhou Medical UniversityQuzhou 324000Zhejiang ProvinceChina

BACKGROUND Idiopathic pulmonary fibrosis(IPF)is classified under fibrotic interstitial pneumonia,characterized by a chronic and progressive *** predominant clinical features of IPF include dyspnea and pulmonary *** To assess the effects of pirfenidone in the early treatment of IPF on lung function in *** A retrospective analysis was performed on 113 patients with IPF who were treated in our hospital from November 2017 to January *** patients were divided into two groups:control group(n=53)and observation group(n=60).In the control group,patients received routine therapy in combination with methylprednisolone tablets,while those in the observation group received routine therapy together with *** applying these distinct treatment approaches to the two groups,we assessed several parameters,including the overall effectiveness of clinical therapy,the occurrence of adverse reactions(e.g.,nausea,vomiting,and anorexia),symptom severity scores,pulmonary function index levels,inflammatory marker levels,and the 6-min walk distance before and after treatment in both *** The observation group exhibited significantly higher rates than the control group after therapy,with a clear distinction(P<0.05).After treatment,the observation group experienced significantly fewer adverse reactions than the control group,with a noticeable difference(P<0.05).When analyzing the symptom severity scores between the two groups of patients after treatment,the observation group had significantly lower scores than the control group,with a distinct difference(P<0.05).When comparing the pulmonary function index levels between the two groups of patients after therapy,the observation group displayed significantly higher levels than the control group,with a noticeable difference(P<0.05).Evaluating the inflammatory marker data(C-reactive protein,interleukin-2[IL-2],and IL-8)between the two groups of patients after therapy,the observation group

关键词： Pirfenidone Early intervention Idiopathic pulmonary fibrosis Pulmonary function Effect evaluation

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Pb、Zn和Cd复合重金属潜在超富集植物的筛选与胁迫响应特征

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环境科学 2024年第8期45卷 4870-4882页

作者：范拴喜张楠孙旻涵侯宪东陕西地建西安交大土地工程与人居环境技术创新中心西安710049 宝鸡文理学院地理与环境学院宝鸡721013 陕西省灾害监测与机理模拟重点实验室宝鸡721013

为了筛选Pb、Zn和Cd复合重金属超富集植物,对宝鸡市典型铅锌矿和冶炼厂区优势植物进行调查、采样和分析,初步筛选出一种潜在的Pb、Zn和Cd复合重金属超富集植物,并采用土培盆栽试验观测其在Pb、Zn和Cd复合重金属胁迫下叶绿素(叶绿素a、... 详细信息

为了筛选Pb、Zn和Cd复合重金属超富集植物,对宝鸡市典型铅锌矿和冶炼厂区优势植物进行调查、采样和分析,初步筛选出一种潜在的Pb、Zn和Cd复合重金属超富集植物,并采用土培盆栽试验观测其在Pb、Zn和Cd复合重金属胁迫下叶绿素(叶绿素a、叶绿素b、类胡萝卜素、总叶绿素)、抗氧化酶(SOD、CAT、POD)和其他生理指标(MDA、脯氨酸)的响应特征,再通过大田试验,进一步验证并确定了其对Pb、Zn和Cd复合重金属的富集能力,以期为Pb、Zn和Cd复合重金属污染土壤修复提供科学依据和技术支撑.结果表明,野外调查发现聚合草对Pb、Zn和Cd的富集量、富集系数(BCF)和转移系数(TF)均满足国际上超富集植物指标限值要求,是一种潜在的Pb、Zn和Cd复合重金属超富集植物;土培盆栽试验显示,随着Pb、Zn和Cd复合重金属胁迫梯度的提高,聚合草叶片中叶绿素a、叶绿素b和总叶绿素含量逐渐降低,直至胁迫梯度大于等于Ⅳ时,导致植物光合系统紊乱;蓖麻叶片中的叶绿素含量呈现“低促高抑”现象,而胁迫过高则激发了自身其他保护系统使得毒害减轻而升高;另外,与CK相比,聚合草和蓖麻的叶绿素a、叶绿素b、类胡萝卜素和总叶绿素各自均存在显著性差异(P<0.05).聚合草和蓖麻叶片中的SOD酶活性均呈现先增加后降低再增加的趋势;聚合草叶片中CAT酶活性先升后降的趋势,呈现“低促高抑效应”,而蓖麻叶片中CAT酶活性呈现持续降低的趋势;聚合草叶片中POD酶活性总体呈现增加趋势,而蓖麻叶片中POD酶活性先升后降低再升高;聚合草叶片中MDA含量总体呈现下降趋势,而蓖麻叶片中MDA含量总体呈上升特征;此外,各胁迫梯度之间,聚合草和蓖麻的SOD、CAT、POD、MDA及脯氨酸均存在显著性差异(P<0.05).大田试验结果表明,聚合草对Pb、Zn和Cd的富集量、BCF和TF均可以达到超富集植物指标限值要求,是一种潜在的Pb、Zn和Cd复合重金属超富集植物种质资源,能作为Pb、Zn和Cd复合重金属污染土壤修复的优选植物.

关键词： Pb、Zn和Cd复合污染超富集植物生理特性植物修复聚合草蓖麻

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Data-driven surrogate model for aerodynamic design using separable shape tensor method

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CHINESE JOURNAL OF AERONAUTICS 2024年第9期37卷 41-58页

作者： Pang, Bo Zhang, Yang Li, Junlin Wang, Xudong Chang, min Bai, Junqiang Xi An Jiao Tong Univ State Key Lab Strength & Vibrat Mech Struct Xian 710049 Peoples R China Northwestern Polytech Univ Unmanned Syst Res Inst Xian 710072 Peoples R China

In the context of increasing dimensionality of design variables and the complexity of constraints, the efficacy of Surrogate-Based Optimization (SBO) is limited. The traditional linear and nonlinear dimensionality reduction algorithms are mainly to decompose the mathematical matrix composed of design variables or objective functions in various forms, the smoothness of the design space cannot be guaranteed in the process, and additional constraint functions need to be added in the optimization, which increases the calculation cost. This study presents a new parameterization method to improve both problems of SBO. The new parameterization is addressed by decoupling affine transformations (dilation, rotation, shearing, and translation) within the Grassmannian submanifold, which enables a separate representation of the physical information of the airfoil in a highdimensional space. Building upon this, Principal Geodesic Analysis (PGA) is employed to achieve geometric control, compress the design space, reduce the number of design variables, reduce the dimensions of design variables and enhance predictive performance during the surrogate optimization process. For comparison, a dimensionality reduction space is defined using 95% of the energy, and RAE 2822 for transonic conditions are used as demonstrations. This method significantly enhances the optimization efficiency of the surrogate model while effectively enabling geometric constraints. In three-dimensional problems, it enables simultaneous design of planar shapes for various components of the aircraft and high-order perturbation deformations. Optimization was applied to the ONERA M6 wing, achieving a lift-drag ratio of 18.09, representing a 27.25% improvement compared to the baseline configuration. In comparison to conventional surrogate model optimization methods, which only achieved a 17.97% improvement, this approach demonstrates its superiority. (c) 2024 Production and hosting by Elsevier Ltd. on behalf of Chine

关键词： Aerodynamic design Grassmannian manifold Shape parameterization Surrogate-based optimization Data dimensionality reduction WING DESIGN OPTIMIZATION

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Expert consensus on the diagnosis, treatment, and prevention of respiratory syncytial virus infections in children

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World Journal of Pediatrics 2024年第1期20卷 11-25页

作者： xian-Li Zhang Xi Zhang Wang Hua Zheng-De Xie Han-min Liu Hai-Lin Zhang Bi-Quan Chen Yuan Chen Xin Sun Yi Xu Sai-Nan Shu Shun-Ying Zhao Yun-Xiao Shang Ling Cao Yan-Hui Jia Luo-Na Lin Jiong Li Chuang-Li Hao Xiao-Yan Dong Dao-Jiong Lin Hong-Mei Xu De-Yu Zhao Mei Zeng Zhi-min Chen Li-Su Huang Department of Infectious Disease Children's HospitalZhejiang University School of Medicine3333 Binsheng RoadBinjiang DistrictHangzhou 310052China Clinical Research Unit Xin Hua Hospital Affiliated to Shanghai Jiao Tong University School of MedicineShanghaiChina Beijing Pediatric Research Institute Beijing Children's HospitalCapital Medical UniversityBeijingChina Department of Pediatric Pulmonology West China Second University HospitalSichuan UniversityChengduChina Department of Pediatric Pulmonology the Second Affiliated Hospital&Yuying Children's HospitalWenzhou Medical UniversityWenzhouChina Department of Infectious Disease Anhui Provincial Children's HospitalHefeiChina Department of Pediatrics the Second Hospital of Hebei Medical UniversityShijiazhuangChina Department of Pediatrics Xijing Hospitalthe Fourth Military Medical UniversityXi'anChina Department of Infectious Disease Guangzhou Women and Children's Medicine CenterGuangzhou Medicine UniversityGuangzhouChina Department of Pediatrics Tongji HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhanChina Department of Respiratory Disease Beijing Children's HospitalCapital Medical UniversityBeijingChina Department of Pediatric Respiratory Shengjing Hospital of China Medical UniversityShenyangChina Respiratory Department Children's Hospital Affiliated to Capital Institute of PediatricsBeijingChina Department of Clinical Epidemiology Aarhus UniversityAarhusDenmark Department of Respirology Children's Hospital of Soochow UniversitySuzhouChina Department of Respiratory Children's Hospital of ShanghaiChildren's Hospital Affiliated to Shanghai Jiao Tong University School of MedicineShanghaiChina Department of Infectious Disease Hainan Women and Children's Medical CenterHaikouChina Department of Infectious Disease Children's Hospital of Chongqing Medical UniversityChongqingChina Department of Respiratory Children's Hospital of Nanjing Medical UniversityNanjingChina Department of Infectious Di

Background Respiratory syncytial virus(RSV)is the leading global cause of respiratory infections and is responsible for about 3 million hospitalizations and more than 100,000 deaths annually in children younger than 5 years,representing a major global healthcare *** is a great unmet need for new agents and universal strategies to prevent RSV infections in early life.A multidisciplinary consensus development group comprising experts in epidemiology,infectious diseases,respiratory medicine,and methodology aims to develop the current consensus to address clinical issues of RSV infections in *** sources The evidence searches and reviews were conducted using electronic databases,including PubMed,Embase,Web of Science,and the Cochrane Library,using variations in terms for"respiratory syncytial virus","RSV","lower respiratory tract infection","bronchiolitis","acute","viral pneumonia","neonatal","infant""children",and"pediatric".Results Evidence-based recommendations regarding diagnosis,treatment,and prevention were proposed with a high degree of *** supportive care remains the cornerstone for the management of RSV infections,new monoclonal antibodies,vaccines,drug therapies,and viral surveillance techniques are being rolled *** This consensus,based on international and national scientific evidence,reinforces the current recommendations and integrates the recent advances for optimal care and prevention of RSV *** improvements in the management of RSV infections will require generating the highest quality of evidence through rigorously designed studies that possess little bias and sufficient capacity to identify clinically meaningful end points.

关键词： Consensus prevention Respiratory syncytial virus Treatment

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多元职业经历与家庭农场高质量发展——基于动态能力的中介效应

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农业现代化研究 2024年第4期45卷 649-660页

作者：兰勇胡敏谢先雄湖南农业大学商学院湖南长沙410128 湖南农业大学经济学院湖南长沙410128

家庭农场高质量发展需要复合型的农业经营管理人才,多元职业经历是塑造复合型农业人才的重要路径。本研究基于烙印理论、社会资本理论和动态能力理论,构建了“多元职业经历-动态能力-农场高质量发展”理论框架,通过对湖南省6市12县共29... 详细信息

家庭农场高质量发展需要复合型的农业经营管理人才,多元职业经历是塑造复合型农业人才的重要路径。本研究基于烙印理论、社会资本理论和动态能力理论,构建了“多元职业经历-动态能力-农场高质量发展”理论框架,通过对湖南省6市12县共292个家庭农场的调研数据,运用最小二乘结构方程模型(PLS-SEM),实证探究多元职业经历对家庭农场高质量的影响机理。研究发现:1)农场主多元化职业经历显著助推家庭农场高质量发展,这一效应不仅依靠认知烙印和社会资本积累发挥直接作用,还通过能力烙印塑造其动态能力发挥中介效果;2)学习创新能力、资源整合能力、环境适应能力在多元职业经历对农场高质量发展的影响中存在显著中介作用,且资源整合能力影响较高;3)多群组分析表明,多元职业经历更有助于促进高融资约束、低政策支持、非省级示范、养殖类和初创发展期的农场高质量发展。因此,可鼓励、引导具有多元职业经历的返乡创业人员经营家庭农场,注重培育和提升农场动态能力,促进家庭农场高质量发展。

关键词：家庭农场多元职业经历动态能力高质量发展偏最小二乘结构方程模型

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丙酸氟替卡松原料及其鼻喷雾剂中丙酸氟替卡松的含量和有关物质UPLC-MS/MS研究

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中国新药杂志 2024年第3期33卷 301-306页

作者：陈忠兰张雅军孙会敏王瑾吴先富中国食品药品检定研究院北京102629

目的:建立UPLC法测定丙酸氟替卡松原料及鼻喷雾剂中丙酸氟替卡松的含量,并利用UPLC-MS/MS法对丙酸氟替卡松杂质进行分析研究。方法:采用HALO 90A,C_(18)色谱柱(100 mm×2.1 mm,2.7μm),流动相为乙腈-0.1%甲酸(含0.1%乙酸铵)溶液,梯度洗... 详细信息

目的:建立UPLC法测定丙酸氟替卡松原料及鼻喷雾剂中丙酸氟替卡松的含量,并利用UPLC-MS/MS法对丙酸氟替卡松杂质进行分析研究。方法:采用HALO 90A,C_(18)色谱柱(100 mm×2.1 mm,2.7μm),流动相为乙腈-0.1%甲酸(含0.1%乙酸铵)溶液,梯度洗脱,流速0.3 mL·min^(-1),柱温40℃,检测波长239 nm。MS采用电喷雾离子(ESI)源,选择正离子模式检测,利用UPLC-MS/MS法对丙酸氟替卡松的杂质进行定性鉴别。结果:丙酸氟替卡松主成分色谱峰与各杂质之间分离良好,丙酸氟替卡松质量浓度在0.5~50.0μg·mL^(-1)范围内与峰面积呈良好的线性关系(R^(2)=0.9998),丙酸氟替卡松鼻喷雾剂的平均回收率为95.51%,RSD为1.59%(n=9),测得丙酸氟替卡松原料中丙酸氟替卡松的含量为99.54%,测得3批丙酸氟替卡松鼻喷雾剂含量为标示量的96.69%,98.32%,96.00%。结论:该方法快速、简便、灵敏,可用于丙酸氟替卡松及其鼻喷雾剂中丙酸氟替卡松的含量测定以及杂质的定性鉴别。

关键词： UPLC 丙酸氟替卡松鼻喷雾剂含量测定定性鉴别

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制造商资金约束闭环供应链的回收及融资决策

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数学的实践与认识 2024年第1期54卷 1-13页

作者：姚锋敏吴金闫颍洛滕春贤哈尔滨理工大学经济与管理学院黑龙江哈尔滨150080

针对由一个制造商和一个主导零售商组成的两阶段闭环供应链,研究制造商资金约束闭环供应链的回收及融资决策问题.构建了四种闭环供应链的决策模型,分析了不同回收模式及融资策略对闭环供应链成员及整体绩效的影响.研究发现,当采用零售... 详细信息

针对由一个制造商和一个主导零售商组成的两阶段闭环供应链,研究制造商资金约束闭环供应链的回收及融资决策问题.构建了四种闭环供应链的决策模型,分析了不同回收模式及融资策略对闭环供应链成员及整体绩效的影响.研究发现,当采用零售商信贷融资策略时,制造商和零售商都缺乏废旧品回收的能动性,且回收模式的不同并不影响闭环供应链最优融资策略的选择.无论哪一方作为回收主体,零售商信贷融资策略都更有利于增加闭环供应链成员利润.无论采用何种融资策略,制造商作为回收主体时更有利于提高闭环供应链的整体效益及废旧品回收率.

关键词：闭环供应链回收模式零售商主导资金约束融资决策

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