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阻燃低烟低毒复合材料在交通运输领域的发展Ⅱ.基体树脂分析

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热固性树脂 2016年第6期31卷 65-68页

作者：马洪霞常州轻工职业技术学院江苏常州213164

介绍了国内市场上常见几种阻燃树脂的阻燃低烟低毒(FST)性能,如不饱和聚酯、丙烯酸树脂、环氧树脂及酚醛树脂。分析指出在未来交通运输领域,高等级防火安全的酚醛复合材料具有很大的竞争力和发展机遇。

关键词：阻燃低烟低毒复合材料不饱和聚酯丙烯酸树脂环氧树脂酚醛树脂

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不同运动项目对聋人大学生身体自我的影响

体育学刊 2010年第6期17卷 55-59页

作者：马宏霞中州大学经济贸易学院河南郑州450044

利用健美操和篮球项目对聋人大学生进行连续干预研究。结果显示:实验后实验组与对照组自尊维度差异存在非常显著性,外表维度差异存在显著性。健美操组实验前、后自尊维度差异存在非常显著性,整体身体、外表维度差异存在显著性;篮球组实... 详细信息

利用健美操和篮球项目对聋人大学生进行连续干预研究。结果显示:实验后实验组与对照组自尊维度差异存在非常显著性,外表维度差异存在显著性。健美操组实验前、后自尊维度差异存在非常显著性,整体身体、外表维度差异存在显著性;篮球组实验前、后体育活动、自尊、身体肥胖维度差异存在显著性,结果说明不同运动项目对聋人大学生身体自我存在不同的影响。

关键词：运动心理学聋人大学生身体自我

Preparation and properties of waste tea leaves particleboard

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Forestry Studies in China 2006年第1期8卷 41-45页

作者： Shi Jin-shu Li Jian-zhang Fan Yong-ming ma hong-xia College of material Science and Technology Beijing Forestry University Beijing 100083 P. R. China Research Institute of Wood Industry Chinese Academy of Forestry Beijing 100091 P. R. China

Urea-formaldehyde （UF） adhesive is the main source of formaldehyde emission from UF-bonded boards. The components in waste tea leaves can react with formaldehyde to serve as a raw material in the production of low formaldehyde emission boards. In our study, waste tea leaves and UF adhesive were employed in the preparation of waste tea leaves particleboard （WTLB）. An orthogonal experimental method was applied to investigate the effects of process parameters on formaldehyde emission and mechanical properties of WTLB. The results indicated that： 1） waste tea leaves had the ability to abate formaldehyde emission from boards; and 2） density of the WTLB was a significant factor affecting its modulus of rupture （MOR）, modulus of elasticity （MOE） and internal bonding （IB）.

关键词： waste tea leaves particleboard (WTLB) formaldehyde emission mechanical property orthogonal design

不同配方吡唑醚菌酯包衣对玉米茎腐病的防治试验

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农药 2023年第2期62卷 154-156页

作者：郭宁于淑晶孙华马红霞边强河北省农林科学院植物保护研究所农业部华北北部作物有害生物综合治理重点实验室河北省农业有害生物综合防治工程技术研究中心河北保定071000 南开大学化学学院农药国家工程研究中心天津300071

[目的]明确不同配方的吡唑醚菌酯种衣剂对玉米茎基腐病的防治效果,筛选出最佳种衣剂。[方法]采用菌丝生长法测定吡唑醚菌酯对茎基腐病主要病原菌效果,测定不同吡唑醚菌酯种衣剂对玉米茎基腐病的田间防效。[结果]吡唑醚菌酯+咯菌腈+精甲... 详细信息

[目的]明确不同配方的吡唑醚菌酯种衣剂对玉米茎基腐病的防治效果,筛选出最佳种衣剂。[方法]采用菌丝生长法测定吡唑醚菌酯对茎基腐病主要病原菌效果,测定不同吡唑醚菌酯种衣剂对玉米茎基腐病的田间防效。[结果]吡唑醚菌酯+咯菌腈+精甲霜灵和吡唑醚菌酯+精甲霜灵包衣能有效的防治玉米茎基腐病,防效均达到80%以上。

关键词：吡唑醚菌酯玉米茎基腐病种衣剂

Transmission of ceftazidime-avibactam-resistant Escherichia coli among pets,veterinarians and animal hospital environment

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Biosafety and Health 2024年第3期6卷 191-198页

作者： Hegen Dai Dongyan Shao Yu Song Qi An Zhenbiao Zhang Haixia Zhang Siyu Chen Congming Wu Jianzhong Shen Yanli Lyu Yang Wang Shizhen ma Zhaofei xia National Key Laboratory of Veterinary Public Health Safety College of Veterinary MedicineChina Agricultural UniversityBeijing 100193China Key Laboratory of Animal Antimicrobial Resistance Surveillance Ministry of Agriculture and Rural AffairsCollege of Veterinary MedicineChina Agricultural UniversityBeijing 100193China Department of Clinical Veterinary Medicine College of Veterinary MedicineChina Agricultural UniversityBeijing 100193China Shanxi Key Laboratory for Modernization of TCVM College of Veterinary MedicineShanxi Agricultural UniversityTaiyuan 030801China Ruichen Pet Hospital Group Co. LtdXiamen 361004China

Ceftazidime-avibactam (CZA) is a recently approved combination synthetic β-lactamase inhibitor used in human clinical medicine. Cases of CZA resistance in humans have already been reported, but limited research has investigated CZA resistance in pets. This study explored the prevalence and transmission of CZA-resistant Escherichia coli (CZAREC) among pets, their owners, veterinarians, and the environment in animal hospitals. A total of 5,419 clinical samples were collected from dogs and cats, along with samples from the environment (n = 5,843), veterinarians (n = 557), and pet owners (n = 368) in animal hospitals. From these samples, 760 Escherichia coli (E. coli) isolates were obtained, out of which 60 were identified as CZAREC. These included 34 isolates from the environment (9.14 %, n = 372), three from veterinarians (8.11 %, n = 37), and 23 from animals (6.82 %, n = 337). No CZAREC isolates were found in pet owners. The predominant sequence types of CZARECs were ST156 (n = 20), ST410 (n = 19) and ST101 (n = 7). Bayesian analysis revealed six clusters comprising 47 isolates from the hospital environment, pets, and veterinaries, displaying genetic relatedness of less than 100 core genome single nucleotide polymorphisms (cgSNPs) between any two isolates in each cluster. Some CZAREC isolates with high genetic similarity persisted in the same animal hospital for four to six months. Moreover, discriminant analysis of principal components indicated that most isolates from different hosts shared a genetic source in the human/dog/cat merged cluster. Overall, evidence of CZARECs transmission was found among pets, the environment, and veterinarians in animal hospitals. The findings emphasize the importance of monitoring CZARECs in the veterinary clinical setting to ensure the health of both pets and humans.

关键词： Ceftazidime-avibactam(CZA) Escherichia coli(E.coli) Pets Animal hospital environment Veterinarians

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吸收对光子晶体偏振态的影响

人工晶体学报 2007年第4期36卷 922-925页

作者：刘启能马红霞重庆工商大学理学院重庆400067 人工晶体研究院北京100018

引入复折射率并利用特征矩阵法,研究了光子晶体的吸收对TE波和TM波的禁带的影响。得出：对TE波其禁带的反射率随消光系数的增加而迅速降低,当消光系数增加为0.03时其反射率降低到0.5。对TM波其禁带的反射率在小角度范围（0-0.9 rad）内... 详细信息

引入复折射率并利用特征矩阵法,研究了光子晶体的吸收对TE波和TM波的禁带的影响。得出：对TE波其禁带的反射率随消光系数的增加而迅速降低,当消光系数增加为0.03时其反射率降低到0.5。对TM波其禁带的反射率在小角度范围（0-0.9 rad）内随消光系数的变化特征与TE波相同,但在大角度范围出现“广义布儒斯特角”现象。“广义布儒斯特角”的位置不随消光系数变化,但“广义布儒斯特角”现象对应的入射角宽度随消光系数的增加而增大。

关键词：光子晶体特征矩阵消光系数偏振态

Development of a droplet digital polymerase chain reaction assay for the sensitive detection of total and integrated HIV-1 DNA

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Chinese Medical Journal 2024年第6期137卷 729-736页

作者： Lin Yuan Zhiying Liu Xin Zhang Feili Wei Shan Guo Na Guo Lifeng Liu Zhenglai ma Yunxia Ji Rui Wang xiaofan Lu Zhen Li Wei xia Hao Wu Tong Zhang Bin Su Beijing Key Laboratory for HIV/AIDS Research Clinical and Research Center for Infectious DiseasesBeijing Youan HospitalCapital Medical UniversityBeijing 100069China Beijing Institute of Hepatology Beijing Youan HospitalCapital Medical UniversityBeijing 100069China

Background:Total human immunodeficiency virus(HIV)DNA and integrated HIV DNA are widely used markers of HIV *** digital polymerase chain reaction(ddPCR)can be used for absolute quantification without needing a standard ***,we developed duplex ddPCR assays to detect and quantify total HIV DNA and integrated HIV ***:The limit of detection,dynamic ranges,sensitivity,and reproducibility were evaluated by plasmid constructs containing both the HIV long terminal repeat(LTR)and human CD3 gene(for total HIV DNA)and ACH-2 cells(for integrated HIV DNA).Forty-two cases on stable suppressive antiretroviral therapy(ART)were assayed in total HIV DNA and integrated HIV *** coefficient analysis was performed on the data related to DNA copies and cluster of differentiation 4 positive(CD4^(+))T-cell counts,CD8^(+)T-cell counts and CD4/CD8 T-cell ratio,*** assay linear dynamic range and lower limit of detection(LLOD)were also ***:The assay could detect the presence of HIV-1 copies 100%at concentrations of 6.3 copies/reaction,and the estimated LLOD of the ddPCR assay was 4.4 HIV DNA copies/reaction(95%confidence intervals[CI]:3.6-6.5 copies/reaction)with linearity over a 5-log_(10)-unit range in total HIV DNA *** the integrated HIV DNA assay,the LLOD was 8.0 copies/reaction(95%CI:5.8-16.6 copies/reaction)with linearity over a 3-log 10-unit *** HIV DNA in CD4^(+)T cells was positively associated with integrated HIV DNA(r=0.76,P<0.0001).Meanwhile,both total HIV DNA and integrated HIV DNA in CD4^(+)T cells were inversely correlated with the ratio of CD4/CD8 but positively correlated with the CD8^(+)T-cell ***:This ddPCR assay can quantify total HIV DNA and integrated HIV DNA efficiently with robustness and *** can be readily adapted for measuring HIV DNA with non-B clades,and it could be beneficial for testing in clinical trials.

关键词： Human immunodeficiency virus HIV Integrated HIV-1 DNA Total HIV DNA Droplet digital polymerase chain reaction HIV reservoir Antiretroviral therapy

税收分成、财政激励与企业异地投资——基于增值税五五分成的准自然实验

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当代财经 2024年第3期 30-42页

作者：李红霞张亚璟马艳首都经济贸易大学财政税务学院北京100071

财政激励作为调节政府间财政分配关系的重要手段,深刻影响着地方政府决策行为。税收分成改革呈现不同的财政激励效果,引发地方税收竞争并传导至企业,对区域经济协调发展有至关重要的影响。将2016年增值税五五分成改革作为财政激励的外... 详细信息

财政激励作为调节政府间财政分配关系的重要手段,深刻影响着地方政府决策行为。税收分成改革呈现不同的财政激励效果,引发地方税收竞争并传导至企业,对区域经济协调发展有至关重要的影响。将2016年增值税五五分成改革作为财政激励的外生冲击变量,通过构建强度差分模型,实证检验税收分成改革带来的激励效应如何影响企业异地投资。研究表明:增值税分成比例提高会激励地方政府积极扶持本地企业留住税源,并抑制企业异地投资。进一步研究发现,无论是对高财政自给率地区还是低财政自给率地区,增值税分成比例变化均表现了强烈的抑制效应,且在低组别的抑制效应更大;地方政府更倾向于对直接控股的地方国有企业和异地投资比例较高的企业进行管控;改革带来的激励变化会促进企业信贷的获得和政府补助的提高。因此,建议提升流动税基的中央集中度,弱化地方政府对企业异地投资的干预动机;建立“赋权—控权”的财政激励机制,抑制地区间过度税收竞争及市场分割现象;推进地方政府从管理型向服务型政府转变,减少对企业异地投资的干预和控制。

关键词：税收分成财政激励企业异地投资增值税五五分成

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蒿本内酯对葡聚糖硫酸钠诱导的溃疡性结肠炎小鼠的改善作用

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食品工业科技 2024年第4期45卷 321-327页

作者：马广礼夏晓培马金亮许昌职业技术学医疗卫生学院河南许昌461000 河南科技大学食品与生物工程学院河南洛阳471000

目的:探究蒿本内酯(ligustilide,Lig)对葡聚糖硫酸钠(dextran sodium sulfate,DSS)诱导溃疡性结肠炎(ulcerative colitis,UC)小鼠的改善作用及机制。方法:将60只雄性SPF级C57BL/6小鼠随机分成6组,分别为空白组、DSS组、阳性药柳氮磺吡啶... 详细信息

目的:探究蒿本内酯(ligustilide,Lig)对葡聚糖硫酸钠(dextran sodium sulfate,DSS)诱导溃疡性结肠炎(ulcerative colitis,UC)小鼠的改善作用及机制。方法:将60只雄性SPF级C57BL/6小鼠随机分成6组,分别为空白组、DSS组、阳性药柳氮磺吡啶(sulfasalazine,SASP)组、Lig低、中、高剂量组。DSS组小鼠自由饮用3%DSS水溶液7 d复制UC模型,同时对Lig低、中、高剂量组小鼠灌胃给予药物干预治疗。通过记录小鼠每日体重和结肠长度,检测疾病活动指数(disease activity index,DAI)评分,采用酶联免疫吸附测定试剂盒定量检测血清中TNF-α、IL-6和IL-1β的表达水平,检测结肠中TLR4/NF-κB蛋白表达水平,并结合苏木素-伊红染色实验,探究Lig对小鼠UC的作用及机制。结果:与空白组比较,DSS组小鼠体重显著减轻(P<0.05),结肠长度显著缩短(P<0.05),DAI评分显著升高(P<0.05),肠道出现大量炎症性浸润现象,且结肠组织中TNF-α、IL-6和IL-1β表达水平显著升高(P<0.05);与DSS组比较,Lig中剂量组和高剂量组小鼠的肠道组织中TNF-α、IL-6和IL-1β的表达以及TLR4/NF-κB信号均被显著抑制(P<0.05),表明Lig中剂量组和高剂量组小鼠肠道损伤得到显著改善。结论:Lig能有效改善DSS诱导的小鼠UC,其机制可能是抑制NF-κB信号通路的激活。

关键词：蒿本内酯溃疡性结肠炎葡聚糖硫酸钠炎症因子