Results 31 to 40 of about 32,590 (266)

试析路桥隧道工程施工技术管理与质量控制

智能城市应用
路桥隧道工程作为基础设施建设的重要组成部分，其施工技术管理与质量控制对于工程的安全性、可靠性和持续运行至关重要。本论文将从控制路桥隧道工程施工技术和质量的意义、施工技术管理以及施工质量控制等方面进行分析，以期为优化工程实施提供科学依据。
瑞平 张
semanticscholar   +1 more source

Carbon‐Insertion‐Engineered WS2 Hierarchical Heterostructure Enabling Superior Sodium‐Ion Storage

Rare Metals, EarlyView.
ABSTRACT Tungsten disulfide (WS2) is considered a promising anode material for sodium‐ion batteries (SIBs). However, its practical application is hindered by poor electrical conductivity, large volume changes during cycling, and sluggish ion diffusion kinetics, which lead to unsatisfactory electrochemical performance.
Xiuli Hu, Ruoyu Liu, Ningchen Tian, Miaoran Deng, Jiaxuan Wang, Botian Liu, Yanwei Li, Jinliang Li, Hui ying Yang, Qing Zhu   +9 more
wiley   +1 more source

济南市售食用植物油中单氯丙醇酯 和缩水甘油酯污染状况Contamination status of monochloropropanol esters and glycidyl esters in edible vegetable oils sold in Jinan

Zhongguo youzhi
为了解济南市售食用植物油中单氯丙醇酯（MCPDE）和缩水甘油酯(GEs)的污染状况，采用同位素稀释-气相色谱-质谱联用法对2019—2023年济南市售食用植物油165份样品中的3-氯丙醇酯（3-MCPDE）、2-氯丙醇酯（2-MCPDE）和133份样品中的GEs含量进行测定,并对其污染水平进行分析。结果表明：济南市售食用植物油中3-MCPDE检出率为87.27%，超标率为21.82%，平均含量为1.19 mg/kg，其中菜籽油中3-MCPDE平均含量最高(2.14 mg/kg)，其次是芝麻油(1.71 ...
孙婷1，焦海峰2 ，郭培玉1，周林1，刘岩1，赵孟源1， 邢婉玥1，张军1 SUN Ting1，JIAO Haifeng2，GUO Peiyu1，ZHOU Lin1，LIU Yan1， ZHAO Mengyuan1，XING Wanyue1，ZHANG Jun1
doaj   +1 more source

Research and Implementation on Quality Improvement during Packaging Process Based on Six Sigma [PDF]

, 2015
质量是企业的生命，也是对消费者根本利益的保证，在厦烟生产过程中，产品质量问题时有发生，造成企业生产成本的上升。开展卷包工序质量改进项目，就是想达到进一步提高卷烟产品质量，降低成本，从而提升本企业卷烟产品竞争力的目的。 六西格玛是20世纪八十年代末由摩托罗拉公司提出的一种质量改进和质量管理方法，它使用数据、事实来解决问题。六西格玛管理关注过程,特别是企业为市场和顾客提供价值的核心过程,其主要目的是在生产过程中降低产品及流程的缺陷次数,防止产品变异,提升品质 ...
陈锦聪
core  

Bifunctional Competitive Structure of Biomass Carbon‐Derived Metacomposites for Tunable ε′‐Near‐Zero and ε′‐Negative Responses

Rare Metals, EarlyView.
ABSTRACT Regulating negative parameters of metacomposites is mainly limited by their unclear mechanisms, which affects their practical applications in new sensing, communication, electromagnetic (EM) protection and other fields. This work proposes a dual‐functional competitive design strategy based on the waste corncob‐derived carbon/polyaniline ...
Qiuyun Yang, Yunpeng Qu, Qixuan Zeng, Xiaosi Qi, Yao Liu   +4 more
wiley   +1 more source

Distribution and Risk Assessment of Perfluorinated Compounds in Jiulong River Watershed-Estuary System [PDF]

, 2016
九龙江是闽南和闽西地区重要的饮用水源和工农业用水水源，但近年来九龙江污染日趋严重，河流生态系统承受着巨大的压力，其中持久性有机污染物(POPs)因其难降解性、生物富集性和高致毒性备受人们关注。全氟化合物(PFCs)是一类碳链上氢原子全部被氟原子取代的有机化合物，由于其良好的疏水、疏油特性，已被广泛应用于多种工业和民用产品中，与人类生产生活密切相关。由于PFCs稳定性极强，目前已在包括水、土壤、大气等环境介质及生物体中大量检出。毒理学研究表明，部分PFCs具有致癌性、肝毒性、神经毒性、生殖毒性、免疫毒性等，
蔡一枝
core  

预应力锚索框架梁施工质量控制要点

智能城市应用
新形势下，随着社会经济与科学技术水平不断提升，推动工程项目的建设与发展。在此背景下，人们对于施工质量也提出更高的标准与要求。在实际开展工程项目建设过程中，通过合理运用预应力锚索框架梁，有效提高整体防护效果，可以确保整体施工质量。基于此，本篇文章将详细分析预应力锚索框架施工质量控制要点，结合具体情况提出合理参考建议。
道景 纪
semanticscholar   +1 more source

Functionally diverse stands promote leaf litter decomposition irrespective of litter species' resource acquisition strategy

Functional Ecology, EarlyView.
Read the free Plain Language Summary for this article on the Journal blog. Abstract Stand functional diversity (RaoQ) and stand functional composition in terms of the functional traits of the component species (CWM trait) are critical for ecosystem processes and functioning, such as litter decomposition and associated nutrient cycling.
Bai‐Yu Yang, Xiao‐Chen Fang, Johannes H. C. Cornelissen, Li‐Ting Zheng, Di‐Feng Bao, Li Zhang, Zhao Zhao, Ci‐Liang Zhao, Hai‐Jun Mao, Zai‐Ping Yu, Dan‐Yan Ou, Marc W. Cadotte, En‐Rong Yan   +12 more
wiley   +1 more source

Development of Simultaneous Determination Method for Multi-categorized Organic Pollutants in Sediment and Its Application to the Study of Combined Pollution Characteristics of the Jiulong RiverEstuary [PDF]

, 2015
我国沿海社会经济相对发达，河口区域承接着流域各类生产、生活活动排放的大量有机污染物。沉积物作为水环境的重要组成部分，既是污染物的主要归宿，又是污染物迁移的载体和二次污染来源。河口沉积物中频繁检出的多环芳烃（PAHs）、多氯联苯（PCBs）、多溴联苯醚（PBDEs）、农药和抗生素等有机污染物严重威胁着河口生态环境。本论文以PAHs、PCBs、PBDEs、农药和抗生素5类122种有机污染物为目标物，运用色谱-串联质谱技术建立了其在沉积物中的分组同时分析方法，并且应用于福建九龙江河口表层和柱状沉积物样品的分析，
易启同
core  

How much biotic nativeness matters across human demographic groups

Conservation Biology, EarlyView.
Abstract Many central concepts of conservation biology—such as nativeness—are structured by ecological and social factors. However, the social consequences of using these concepts to make conservation decisions remain inadequately understood. Some researchers argue that nativeness, rather than acting as an objective proxy for important ecological ...
Harold N. Eyster, Rachelle K. Gould
wiley   +1 more source