低碳经济型电子商务的发展与研究

介绍了中国电子商务发展的趋势,主要有电子商务销售规模大幅度高,电子商务企业发展迅速,交易日益多样化,移动网络成为交易平台,探讨了中国电子商务实施低碳发展的困境,它们是B2C小订单零售模式,小企业电子商务基础差,效率较低,建立科学的电子商务线路问题,促进电商低碳发展,提出了中国电子商务与低碳发展的趋势,主要是电子商务产业的信息服务平台,电子商务采用公车模式,鼓励电子商务大订单交易,电子商务交易不断优化创新,提高中国低碳发展水平.     

加筋土挡墙动力特性研究进展

加筋土挡墙表现出很好的抗震性能,对于加筋土挡墙的动力特性研究有利于更好地弄清楚其工作机理,为加筋土挡墙在动荷区特别是地震区的更广泛应用奠定基础。根据大量文献资料,从试验研究、数值模拟和传统的拟静力方法等三个方面阐述了目前加筋土挡墙动力特性的研究进展,并对今后的研究作了展望。     

新型光电检测技术在污泥处理中的应用

通过实验研究和理论分析,讨论了将透光脉动检测技术应用到污泥处理的过程中。结果表明,这项检测技术能够准确而灵敏地反映污泥的絮凝颗粒粒径的变化情况,是对污泥调理和脱水性能进行连续在线控制的一项有效检测指标。     

化学需氧量测定方法的研究进展

化学需氧量是水质监测的一项重要指标。对化学需氧量标准测定法围绕提高分析速度，缩短回流时间，降低试剂费用而进行的样品消解方法、测定手段、催化剂和氧化剂等方面的改进，及间接预测、在线自动监测研究进展作了简要综述。     

Transport of citrate and polymer coated gold nanoparticles (AuNPs) in porous media: Effect of surface property and Darcy velocity

With the release of nanoparticles(NPs) into the subsurface,it is imperative to better understand the fate and transport of NPs in porous media.Three types of stable AuNPs were used as model NPs to investigate the impact of surface coatings(type and coverage) and water velocity on the NP transport in a porous media(column studies).The NPs were electrostatic stabilized citrate AuNPs and sterically stabilized AuNPs with amphiphilic block co-polymer(PVA-COOH) in two particle/polymer ratios(weak vs.strong stabilization).The citrate AuNPs transport was sensitive to ionic changes in the mixing front of the plume,where destabilization occurred,and will therefore depend on the size/type of release.Blocking of deposition sites by aggregates was seen to facilitate transport,whereby a higher flow velocity(larger shadow zone) also resulted in better transport.The polymeric surface coating had great impact with steric repulsion as a main force contributing to the transport of NPs in the porous media.Sufficient polymer coating was crucial to obtain highly unfavorable attachment conditions(very low α) where the enhanced NP mobility was independent of the water velocity(comparable to solute tracer).Without sufficient steric stabilization,the transport and recovery was significantly reduced compared to the solute tracer,but increased with increasing water velocity.This highlights the importance of sufficient surface coating to achieve enhanced mobility,but also the increased risk of spreading to down-gradient receptors.For the(weakly) sterically stabilized NPs,the loss of polymer through ligand exchange with the porous media negates transport.     

大型海啸灾害后重伤员批量护理风险建模研究

大型海啸灾害等自然灾害的发生产生了大量重伤员,所以研究大型海啸灾害后重伤员的批量护理风险建模极为重要.通过大型海啸灾害救治流程预案启动和重伤员批量护理实施方法两部分研究大型海啸灾害后重伤员批量护理方法,并提出通过前馈控制性管理防范护理风险.提升护理风险管理的科学性以及全面性.通过护理风险防范预案提升重伤员护理质量将大型...     

基于CiteSpace分析的国内外战略环境影响评价研究进展

为探究我国战略环境影响评价（简称战略环评）研究发展与演变特征,以近20年Web of Science 和中国知网收录文献作为研究对象,运用CitesSpace文献分析工具绘制知识图谱,对比分析国际上与国内战略环评的研究力量、演变特征等信息,结合实践探索情况以及聚类分析实证结果,重点分析战略环评领域研究热点,通过对比国际上战略环评研究成果,提出新时期我国环境影响评价宏观管理的展望与设想。通过国际上与国内战略环评研究重点的对比可知,战略环评是公认的参与全球环境治理的工具,它适用于复杂动态巨系统的预测评价,是优化国土开发格局、保障生态安全的政策工具,为多利益相关方提供了对话、协商与决策的平台。尽管近年来我国大区域战略环评实践与生态环境分区管控研究成果显著,对比国外属于创新性研究实践,但整体上依然存在发文力度不大、国际合作不足等现象。为进一步提升战略环评预防效应,一方面,需积极融入生态文明建设,系统总结战略环评实践成果,实践—理论—再实践,不断完善适合我国国情的战略环评宏观理论和方法,推广我国研究成果走向国际;另一方面,需持续注入研究活力,加快构建涵盖多学科、多领域的专家库,集成各类技术资源,联合各方技术力量,为提高政策、战略、规划的“绿色含量”出谋划策。

     

基于文献计量的减污降碳协同减排研究进展与展望

开展污染物和二氧化碳的协同减排是当前我国推进生态文明建设的关键途径和重要抓手,分析国内外研究热点与趋势,有助于为我国协同减排治理理论研究与实践路径提供参考。运用CiteSpace对Web of Science核心数据库和中国知网的中英文相关文献进行梳理分析,探讨该领域研究的发展态势。结果表明：该领域发文量呈上升趋势且有一定阶段性,美国和中国发文量较高,其他发文主要集中于欧美与东亚地区国家;除了环境科学类期刊发文较多外,国外的能源类期刊影响力较大,国内则是经济与管理类期刊有较大影响力;国内外研究关注该领域的应对策略和政策及其效应评估,此外国外研究关注排放模拟,国内研究关注特定行业和区域及减污降碳领域的体制机制构建。未来研究的重点是综合考虑区域协同发展背景及多重环境政策的影响机制,研究减污降碳、协同减排的路径及其政策体系。

     

矿用耐崩风筒在掘进迎头的性能研究

进行矿用风筒现场应用的实际性能实验,可以全面直观的检验风筒的通风性能和抗炮崩能力,对于风筒产品的质量考核和掘进迎头的通风安全具有重要意义。本文针对新型Kevlar耐崩风筒,研究矿用风筒性能的判定指标和检测方法,并在全岩巷道掘进工作面、半煤岩巷道掘进工作面以及全煤巷道掘进工作面进行Kevlar风筒现场应用实验,与我国目前矿山普遍使用的玻纤布风筒的现场应用进行对比,从物理机械强度、通风性能以及掘进成本等方面分析Kevlar耐崩风筒的实际性能,研究Kevlar风筒替代玻纤布风筒的可行性。经过现场应用的实验和检验,Kevlar风筒比目前国内应用的玻纤布风筒性能优越,具有经济、安全、耐用、便捷的特点。     

Enhanced hydrolytic removal of tylosin in wastewater using polymer-based solid acid catalysts converted from polystyrene

Antibiotic production wastewater usually contains high concentrations of antibiotic residues, which can cause instability and deterioration of biological wastewater treatment units and also domestication and proliferation of antibiotic-resistance bacteria. An effective pretreatment on antibiotics production wastewater is expected to selectively reduce the concentration of antibiotics and decrease the toxicity, rather than mitigate organic and other contaminants before further treatments. In this work, two polymer-based solid acids, PS-S and CPS-S bearing high concentrations of -SOH₃ groups (up to 4.57 mmol/g), were prepared and successfully used for hydrolytic mitigation of 100 mg/L tylosin within 20 min. The co-existence of high concentrations of COD and humic substances did not affect the mitigation of tylosin obviously, while more than 500 mg/L of nitrogenous compounds suppressed the hydrolytic efficiency. Recycle and reuse experiments showed that the solid acids performed well in five cycles after regeneration. Three transformation products (P1, P2 and P3) were identified using UPLC-QTOF-MS/MS. Sugar moieties including mycarse, mycaminose, and mycinose detached and released simultaneously or in order from the 16-member lactone ring through desugarization, which led to a dramatic decrease in antibacterial activity as revealed by cytotoxicity evaluations using S. aureus. Ecotoxicity estimation indicated the acute toxicities of the hydrolyzed products to model species (e.g., fish, daphnid and green algae) were classified as “not harmful”. This work suggested an effective and selective method to pretreat tylosin-contained production wastewater by using polymer-based solid acids. These results will shed light on effective elimination of antibiotics pollution from pharmaceutical industries through strengthening the pretreatments.