检索结果-南通市图书馆

低温等离子体空气净化器在高速公路收费岗亭的干预效果分析

在线全文

学校读者我要写书评

暂无评论

环境与职业医学 2024年第5期41卷 474-481页

作者：刘松荣周世军肖燕萍周鹏晏致涛马非钟永力蔡姣刘炜浙江交投高速公路运营管理有限公司技术研发中心浙江杭州310020 重庆科技大学建筑工程学院重庆401331 重庆科技大学健康环境研究院重庆401331 重庆市能源投资集团科技有限责任公司重庆400061

[背景]高速公路收费站空气污染严重,收费人员存在较高的职业暴露风险,亟须研发适用于高速公路收费岗亭气载颗粒物和微生物病原体的净化方法。[目的]验证低温等离子体空气净化器对高速公路收费岗亭室内气载颗粒物和微生物的净化效果。基... 详细信息

[背景]高速公路收费站空气污染严重,收费人员存在较高的职业暴露风险,亟须研发适用于高速公路收费岗亭气载颗粒物和微生物病原体的净化方法。[目的]验证低温等离子体空气净化器对高速公路收费岗亭室内气载颗粒物和微生物的净化效果。基于对照干预实验设计,选取某高速公路收费站三个收费岗亭作为测点,开展6 d的现场对照干预实验(无干预期:前3 d未开启低温等离子体净化器;干预期:后3 d每天9:00-17:00开启净化器)。实验期间持续监测室内外等效直径小于2.5μm(PM_(2.5))和小于10μm(PM_(10))的可吸入颗粒物浓度;每天上午(9:00)、中午(12:00)和下午(17:00),使用浮游微生物采样器采集收费岗亭室内外空气样品,分析气载细菌总数;每天9:00-17:00采用智能中流量颗粒物采样器持续采集最外侧出站口室内的气载颗粒样品,使用基因测序分析样品内含细菌和真菌种属明细及其相对丰度。采用独立样本t检验比较干预期和无干预期室内气载PM_(2.5)、PM_(10)和细菌总数的浓度差异;采用α多样性分析、β多样性分析和t检验(两组比较),比较干预期3 d和无干预期3 d气载颗粒样品内含细菌和真菌具体种属及样品内含典型致病细菌和真菌病原体种属的物种多样性和相对丰度差异,以反映低温等离子体空气净化器对气载PM_(2.5)、PM_(10)和微生物的净化效果。[结果]干预期室内PM_(2.5)和PM_(10)浓度及细菌总数的均值均低于无干预期室内均值(P<0.01或P<0.001);干预期PM_(2.5)和PM_(10)的室内浓度/室外浓度值(I/O)均低于无干预期(P<0.001);但干预期细菌总数的I/O值与无干预期比较,差异无统计学意义。以上午9:00收费岗亭室内PM_(2.5)的平均浓度为基准,中午12:00和下午17:00的室内PM_(2.5)平均净化率分别为49.0%和46.1%,PM_(10)为49.7%和45.4%,细菌总数为50.8%和49.9%。β多样性分析显示干预期和无干预期细菌种水平,真菌属水平和种水平上的物种组成成分均存在差异。与无干预期相比,干预期颗粒样品内含乳杆菌属等10种细菌和圆酵母菌属等7种真菌的相对丰度更低,但干预期枝孢霉科未分类属、多臂菌属和尾孢菌属真菌的丰度更高(均P<0.05)。对于典型致病菌,干预期乳杆菌属细菌和狭窄梭菌属细菌的相对丰度分别降低了73.5%和86.9%,干预期篮状菌属真菌降低了53.5%,差异均有统计学意义(P<0.05)。[结论]低温等离子体空气净化器对高速公路收费岗亭室内气载PM_(2.5)、PM_(10)和浮游细菌具有较好的净化效果,但对室内气载颗粒内含部分真菌的净化作用可能有限。

关键词：低温等离子体收费岗亭可吸入颗粒物细菌总数基因测序净化效果

土壤微塑料污染和农业安全:来源、影响和去除

在线全文

学校读者我要写书评

暂无评论

贵州师范大学学报（自然科学版） 2024年第4期42卷 31-43页

作者：张永江陈洪敏吴丽君潘小丽肖艳平重庆化工职业学院重庆401220 重庆市江津区生态环境监测站重庆402260

土壤中广泛存在的微塑料可以通过影响农业产物品质的方式来对人体健康造成危害。为此,分析了土壤中微塑料的主要来源途径(地膜的使用、污水的灌溉、有机肥的施用以及大气的沉降),探究了微塑料污染对农业生产的影响,主要包括影响农业作物... 详细信息

土壤中广泛存在的微塑料可以通过影响农业产物品质的方式来对人体健康造成危害。为此,分析了土壤中微塑料的主要来源途径(地膜的使用、污水的灌溉、有机肥的施用以及大气的沉降),探究了微塑料污染对农业生产的影响,主要包括影响农业作物(粮食作物、经济作物等)、干扰农业动物(陆生动物和水生动物)以及破坏土壤健康(土壤结构、理化性质、微生物等),讨论了缓解土壤微塑料污染的方式(减少土壤微塑料输入、增强土壤微塑料去除、加快可降解塑料的替代)及未来可研究的工作。

关键词：微塑料农业生产土壤污染农业安全人体健康

维普期刊数据库博看期刊

血清甲状腺球蛋白在分化型甲状腺癌患者术后疗效及预后评价中的应用效果

在线全文

学校读者我要写书评

暂无评论

医疗装备 2024年第14期37卷 13-16页

作者：徐海燕肖燕萍林青福建医科大学肿瘤临床医学院·福建省肿瘤医院福建福州350000

目的探讨血清甲状腺球蛋白(Tg)在分化型甲状腺癌(DTC)患者术后疗效及预后评价中的应用效果。方法选取2015年6月至2016年5月于医院拟行清甲术治疗的171例DTC患者作为研究对象,根据患者预后分为复发组(9例)和未复发组(162例)。比较两组手... 详细信息

目的探讨血清甲状腺球蛋白(Tg)在分化型甲状腺癌(DTC)患者术后疗效及预后评价中的应用效果。方法选取2015年6月至2016年5月于医院拟行清甲术治疗的171例DTC患者作为研究对象,根据患者预后分为复发组(9例)和未复发组(162例)。比较两组手术前后患者血清Tg水平,分析血清Tg预测DTC患者术后复发的最佳临界值,并分析血清Tg水平与DTC患者术后生存期的关系。结果术前,两组血清Tg水平比较,差异无统计学意义(P>0.05);术后,复发组血清Tg水平高于未复发组,差异有统计学意义(P<0.05);术后第12个月,DTC患者血清Tg水平对预测无病生存的受试者工作特征(ROC)曲线下面积(AUC)为0.748,最佳截断值为1.70μg/L,约登指数最大(0.53),对应的灵敏度和特异度分别为0.86和0.99(P<0.05)。结论血清Tg可作为DTC患者术后疗效及预后评价的监测指标。

关键词：分化型甲状腺癌甲状腺球蛋白预后,相关性

维普期刊数据库博看期刊

血流感染肺炎克雷伯菌毒力基因分布和临床分子特征

在线全文

学校读者我要写书评

暂无评论

检验医学 2024年第3期39卷 249-255页

作者：俞凤胡龙华肖艳萍杨军平江西中医药大学附属医院检验科江西南昌330006 南昌大学第二附属医院检验科江西南昌330006

目的分析血流感染肺炎克雷伯菌的毒力基因分布和临床分子特征。方法收集2016年1月—2017年3月南昌大学第二附属医院158株肺炎克雷伯菌非重复临床分离株。采用自动化鉴定药敏仪进行菌种鉴定和体外药物敏感性试验。采用拉丝试验筛选高毒... 详细信息

目的分析血流感染肺炎克雷伯菌的毒力基因分布和临床分子特征。方法收集2016年1月—2017年3月南昌大学第二附属医院158株肺炎克雷伯菌非重复临床分离株。采用自动化鉴定药敏仪进行菌种鉴定和体外药物敏感性试验。采用拉丝试验筛选高毒力肺炎克雷伯菌(hvKP)。采用聚合酶链反应(PCR)检测肺炎克雷伯菌毒力基因、耐药基因和5种常见荚膜血清型。对菌株进行多位点序列分型(MLST)和同源性分析。收集感染患者相关临床资料,比较碳青霉烯类耐药肺炎克雷伯菌(CRKP)和常用抗菌药物敏感肺炎克雷伯菌(SKP)感染患者的临床特征。结果158株肺炎克雷伯菌中,CRKP 22株(13.9%),SKP 29株(18.4%)。CRKP菌株均为多重耐药菌,全部表达碳青霉烯类耐药基因blaKPC-2,其中1株同时携带金属酶碳青霉烯类耐药基因blaIMP-4。拉丝试验结果显示,51株血流感染肺炎克雷伯菌中,有13株为hvKP,其中CRKP 2株、SKP 11株。SKP菌株uge、iutA、mrkD、alls、aerobactin基因检出率高于CRKP菌株,ybtA基因检出率高于CRKP菌株(P70%,其中A型(5株)、B型(9株)、C型(3株)均为ST11型CRKP,4株ST23型SKP均为D型。CRKP和SKP感染患者接受侵入性操作、使用碳青霉烯类抗菌药物和预后差异均有统计学意义(P0.05)。结论肺炎克雷伯菌毒力基因ybtA、uge、mrkD、alls、iutA和aerobactin可作为hvKP的毒力标记物。CRKP菌株耐药基因复杂多样,感染患者预后差,建议临床尽早进行CRKP筛查。

关键词：肺炎克雷伯菌血流感染毒力基因多位点序列分型临床特征

基于六经辨证的热敏灸联合肌内效贴治疗腰椎间盘突出症临床观察

在线全文

学校读者我要写书评

暂无评论

中国中医药现代远程教育 2024年第1期22卷 122-125页

作者：肖艳平刘秋连张敏索艳荣刘宁南方医科大学南方医院赣州医院/赣州市人民医院脊柱外科江西赣州341000 南方医科大学南方医院赣州医院/赣州市人民医院中医科江西赣州341000

目的探究基于六经辨证的热敏灸联合肌内效贴治疗腰椎间盘突出症(LDH)的临床效果。方法选取2020年1月—2021年10月南方医科大学南方医院赣州医院收治的88例LDH患者,以随机数字表法分为观察组和对照组,各44例。对照组采用常规热敏灸联合... 详细信息

目的探究基于六经辨证的热敏灸联合肌内效贴治疗腰椎间盘突出症(LDH)的临床效果。方法选取2020年1月—2021年10月南方医科大学南方医院赣州医院收治的88例LDH患者,以随机数字表法分为观察组和对照组,各44例。对照组采用常规热敏灸联合肌内效贴(KT)治疗,观察组则采用基于六经辨证的热敏灸联合KT治疗。观察2组疼痛情况、情绪状态、腰痛症状、腰椎活动度、临床疗效和血清相关指标的差异。结果治疗后,观察组疼痛视觉模拟量表(VAS)评分、汉密尔顿抑郁量表(HAMD)评分和血清白细胞介素-6(IL-6)、肿瘤坏死因子-α(TNF-α)以及单核细胞趋化蛋白-1(MCP-1)含量均显著低于对照组(P<0.05);观察组日本骨科协会腰痛评价量表(JOA)评分、腰椎前屈和后伸的活动度均显著高于对照组(P<0.05)。观察组临床总有效率为93.18%(41/44),高于对照组的81.82%(36/44)。结论基于六经辨证的热敏灸相对于常规热敏灸疗法,在联合KT治疗腰LDH时,具有更佳的临床效果,值得推广应用。

关键词：腰痛腰椎间盘突出症六经辨证热敏灸肌内效贴

Stripping of aggregate from mortar in waste concrete heated by microwave:Mechanisms of differential-temperature stress and vapor expansion pressure

在线全文

学校读者我要写书评

暂无评论

Journal of Traffic and Transportation Engineering(English Edition) 2024年第3期11卷 538-558页

作者： yanping Sheng xiao Huan Peizhen Hu Liangliang Li Ahmed Abdulakeem Zhoujing Ye Linbing Wang yanping Yin School of Materials Science and Engineering Chang'an UniversityXi'an 710064China Engineering Research Center of Transportation Materials Ministry of EducationChang'an UniversityXi'an 710064China National Center for Materials Service Safety University of Science and Technology BeijingBeijing 100083China School of Environmental CivilAgricultural and Mechanical EngineeringCollege of EngineeringUniversity of GeorgiaAthensGA 30602USA

Microwave heating,which is used for pre-treatment of concrete before it is comminuted,stands as a strong candidate for selective liberation of multiphase materials like *** paper is concerned with the selective liberation of concrete's raw constituents(particularly aggregate)for recycling by considering the water content of concrete as a parameter of microwave heating for the first *** deterioration law of the concrete's performance was characterized by the variation in the splitting tensile strength and relative dynamic modulus after heating by microwave at different water ***,tests were conducted to evaluate the performance of the interface transition zone(ITZ)between aggregate and mortar as well as to investigate the reasons for the stripping behavior of aggregate-mortar,which included the interface tensile strength test,temperature measurement,and porosity *** deterioration law of splitting tensile strength and relative dynamic modulus revealed that the performance of concrete was subject to different degrees of damage depending on the water ***,experimental results showed that interface bonding strength between aggregate and mortar was dramatically impaired,and a large temperature difference was generated between the aggregate and mortar during microwave ***,the permeable pores increased considerably even when the specimens were *** the presence of water,the intactness of ITZ between aggregate and mortar was destroyed by microwave heating,and its performance was significantly lowered,which led to the occurrence of stripping behavior between aggregate and *** was reaffirmed by the microstructure presented by scanning electron ***,the newly developed microwave pretreatment improved by providing appropriate water contents for concrete corresponding to different strength grades is a promising method for recycling aggregate from waste concrete.

关键词： Waste concrete Recycled aggregate Microwave heating Stripping behavior Differential-temperature stress Vapor expansion pressure

New steelmaking process based on clean deoxidation technology

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2024年第6期31卷 1249-1262页

作者： Zhongliang Wang yanping Bao State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China

After the converter steelmaking process,a considerable number of ferroalloys are needed to remove dissolved oxygen from the molten steel,but it also forms a lot of oxide inclusions that cannot be completely *** the same time,it increases the carbon emis-sions in the steel production *** years of research,our team have developed a series of clean deoxidation technologies,includ-ing carbon deoxidation,hydrogen deoxidation,and waste plastic deoxidation of molten steel to address the aforementioned *** this study,thermodynamic calculations and laboratory experiments were employed to verify that carbon and hydrogen can reduce the total oxygen content in the molten steel melt to below 5×10^(-6) and 10×10^(-6),*** analysis of the deoxidation mechanisms and ef-fects of polyethylene and polypropylene was also *** addition,the applications of carbon deoxidation technology in different steels with the hot-state experiment and industrial production were discussed *** carbon deoxidation experimental results of different steels were as follows:(1)the oxygen content of bearing steel was effectively controlled at 6.3×10^(-6) and the inclusion number density was lowered by 74.73%compared to aluminum deoxidized bearing steel;(2)the oxygen content in gear steel was reduced to 7.7×10^(-6) and a 54.49%reduction of inclusion number density was achieved with almost no inclusions larger than 5μm from the average level of industry gear steels;(3)a total oxygen content of M2 high-speed steel was as low as 3.7×10^(-6).In industrial production practice,car-bon deoxidation technique was applied in the final deoxidation stage for non-aluminum deoxidized bearing steel,and it yielded excellent results that the oxygen content was reduced to below 8×10^(-6) and the oxide inclusions in the steel mainly consist of silicates,along with small amounts of spinel and calcium aluminate.

关键词： clean deoxidation carbon deoxidation hydrogen deoxidation waste plastics deoxidation

Development and prospects of molten steel deoxidation in steelmaking process

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2024年第1期31卷 18-32页

作者： Zhongliang Wang yanping Bao State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China

In the long traditional process of steelmaking,excess oxygen is blown into the converter,and alloying elements are used for *** inevitably results in excessive deoxidation of products remaining within the steel liquid,affecting the cleanliness of the *** the increasing requirements for steel performance,reducing the oxygen content in the steel liquid and ensuring its high cleanliness is *** more than a hundred years of development,the total oxygen content in steel has been reduced from approximately 100×10^(-6)to approximately 10×10^(-6),and it can be controlled below 5×10^(-6)in some steel grades.A relatively stable and mature deoxidation technology has been formed,but further reducing the oxygen content in steel is no longer significant for improving steel *** research team developed a deoxidation technology for bearing steel by optimizing the entire conventional *** technology combines silicon–manganese predeoxidation,ladle furnace diffusion deoxidation,and vacuum final *** successfully conducted industrial experiments and produced interstitial-free steel with natural decarbonization ***-aluminum deoxidation was found to control the oxygen content in bearing steel to between 4×10^(-6) and 8×10^(-6),altering the type of inclusions,eliminating large particle Ds-type inclusions,improving the flowability of the steel liquid,and deriving a higher fatigue *** natural decarbonization predeoxidation of interstitial-free steel reduced aluminum consumption and production costs and significantly improved the quality of cast billets.

关键词： steel deoxidation deoxidizer metallurgical equipment bearing steel IF steel

Copper-catalyzed C(sp)-H aryl amination enables modular synthesis of quinolines and 2-quinolinones

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2024年第2期67卷 595-603页

作者： Yang Gao Haixia Li Simin Yang yanping Huo Qian Chen Xianwei Li Zhe Wang xiao-Qiang Hu School of Chemical Engineering and Light Industry Guangdong University of TechnologyGuangzhou510006China Jieyang Branch of Chemistry and Chemical Engineering Guangdong Laboratory Jieyang515200China Key Laboratory of Catalysis and Energy Materials Chemistry of Ministry of Education&Hubei Key Laboratory of Catalysis and Materials Science School of Chemistry and Materials ScienceSouth-Central University for NationalitiesWuhan430074China

Herein,we disclose a novel copper-catalyzed C(sp)-H aryl amination of terminal alkynes with anthranils,enabling the rapid generation of highly reactive secondary N-aryl ynamines for the modular synthesis of structurally diverse C2-substituted quinolines and *** in-situ formed carbonyl-ynamines are prone to tautomerize to carbonyl-ketenimines,which can efficiently react with a series of nucleophiles,including amines,alcohols,phenols,thiols,thiophenols,active-methylene compounds,and even water to produce various quinoline derivatives with the generation of H_(2)O as a sole and green *** method also unlocks a practical route to create various quinoline-fused heterocycles and can be successfully applied to the late-stage modification of complex molecules and the concise synthesis of bioactive *** studies reveal a coppercatalyzed inner-sphere nitrene transfer process by using anthranils as novel aryl nitrene precursors.

关键词： copper catalysis anthranils C(sp)-H aryl amination carbonyl-ketenimines quinolines