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关键词： 伸缩缝   组合模板   狭小空间   快速安拆  

摘要： 针对传统高层建筑伸缩缝剪力墙施工时,因伸缩缝处空间狭小而导致的施工困难、剪力墙成形质量不高的问题,研发了高层建筑伸缩缝剪力墙组合模板快速安拆施工技术。新工艺操作简便,能确保伸缩缝处剪力墙模板体系的安全性和有效性,并能提高施工效率和施工质量,具有较好的社会效益和经济效益。

关键词： 屋顶绿化   中小学   校园   构建模式  

摘要： 中小学作为城市的重要组成部分,其校园屋顶绿化对于发展绿色校园,提升校园整体生态环境,促进师生身心健康发展具有重要意义。本文分析当前国内中小学屋顶绿化的现状及问题,探索适合中小学校园的屋顶绿化构建模式,并对几种模式进行对比分析,以期为中小学校园屋顶绿化建设提供一定的参考价值。

关键词： 市政道路   桥梁建设   伸缩缝   施工技术  

摘要： 在开展市政道路桥梁建设工作时,其施工技术的质量会在很大程度上影响工程的质量,其中伸缩缝施工技术是一种常用的技术,但它的实际操作难度相对较高.现场工作人员为了更好地利用该技术进行现场施工操作,需要加强技术注意事项以及技术操作步骤的研究.

关键词： 城市隧道   防水   混凝土   沉降缝  

摘要： 近年来,随着人口聚集、车辆的增多、城镇化的快速发展,城市隧道在道路交通中广泛应用,有效地缓解了交通压力。城市隧道结构设计使用年限一般为100年,因此对于防水工程的可靠性和耐久性等都提出了较高的要求,以防止隧道渗水漏水状况的发生,确保地下隧道的运行安全。

关键词： Arsenic trioxide   Red blood cells   Methylated arsenic   HPLC-HG-AFS   HIGH-RISK   BINDING   METABOLITES   HEMOGLOBIN   SPECIATION   APL   PLASMA   URINE   ACID  

摘要： Background: Arsenic trioxide (ATO) has been successfully applied in the treatment of acute promyelocytic leukemia (APL). Arsenic metabolites including inorganic arsenic and methylated arsenic could lead to different toxicity and curative effect. This study aims to establish a method to determine arsenic species in red blood cells (RBCs), clarify the distribution characteristics of arsenic species in RBCs. Methods: Steady state blood samples were collected from 97 APL patients. H2O2 and HClO4 were used to release the hemoglobin bounding arsenic and precipitate protein. Arsenite (iAs(III)), arsenate (iAs(V)), monomethylarsonic acid (MMA(V)) and dimethylarsinic acid (DMA(V)) in plasma and RBCs were detected by HPLC-HG-AFS. Free and bound arsenic species in RBCs were separated by 30 kDa molecular mass cutoff filters and determined to evaluate hemoglobin binding capacity of different arsenic species. Results: The method was validated with accuracy ranged from 84.75% to 104.13%. Arsenic species in RBCs followed the trend iAs > MMA > DMA (p < 0.01), while the concentration of DMA was significantly higher than iAs and MMA in plasma (p < 0.01). The correlation between iAs concentration in plasma and corresponding RBCs arsenic level was weak. And the concentrations of DMA and MMA in plasma were moderately positive correlated with those in RBCs. Hemoglobin-binding ratios of iAs, MMA and DMA were all over 70 %. Conclusions: In this study, we provided a reliable method to determine arsenic species in RBCs of APL patients treated with ATO by HPLC-HG-AFS. It was confirmed that the concentration of DMA is the highest in plasma, while MMA is the most predominant methylated arsenic in RBCs. High affinity of MMA with human Hb was responsible for the accumulation of arsenic in RBCs of APL patients. (C) 2021 Elsevier B.V. All rights reserved.

关键词： 高职院校   生源多元化   分层分类教学  

摘要： 自2019年高职百万扩招开始,高职院校生源更加多元化。来自不同渠道的学生,层次不一、基础不同、发展需求不一致、个体差异很大。单一的人才培养模式难以满足多元化生源的需求。在此背景下,通过学情分析,开展生源精准分层分类、全面的专业指导、科学制定人才培养方案、建设分层分类课程体系、分步实施分层分类教学等方面的研究,制定了各项保障措施以探索高适用性的分层分类教学模式。

关键词： 塔头狭叶黄芩   抗旱   耐贫瘠   屋顶绿化  

摘要： 塔头狭叶黄芩是唇形科黄芩属植物,通过在北京地区引种观测,总结出其栽培技术。塔头狭叶黄芩在露地种植生长过程中易养护,表现出较好的抗旱、耐贫瘠、覆地效果佳等性状,作为绿化植被在园林应用尤其是屋顶绿化的应用有着广阔的前景。

关键词： 高速公路   双连拱隧道   中隔墙   施工技术  

摘要： 以某高速公路中的隧道工程为例,分析了双连拱隧道中隔墙施工技术,包括控制测量、锚杆超前支护、开挖中导坑等内容。分析结果表明,在双连拱隧道中隔墙施工时,要做好控制测量和超前支护工作并开挖中导坑。同时,施工中隔墙的过程中,要控制好浇筑和振捣工序,保证施工质量,做好防排水措施,避免渗水对隔墙造成不利影响。

关键词： Functionally graded carbon nanotube-reinforced composite   Regular polygon built-up structure   Vibration   Flutter   Supersonic airflow   COUPLED RECTANGULAR-PLATES   POWER TRANSMISSION   SHAPED PLATES   INPLANE   PANELS  

摘要： The paper is dedicated to the vibration and flutter analysis of functionally graded carbon nanotube-reinforced composite (FG-CNTRC) regular polygon built-up (RPB) structures with general boundary conditions. By employing the first-order shear deformation theory (FSDT) and quasi-steady supersonic piston theory, the energy functional expressions of the system are formulated. The governing equations of the system are derived based on the Hamilton's principle and the solutions for the dynamic problems of the system are obtained by using the modified Ritz method. The accuracy and efficiency of the proposed model are validated by comparing the obtained solutions with those from the FEM and literature. Finally, the effects of the boundary condition, volume fraction of carbon nanotubes (CNT) and CNT distribution on the vibration and flutter characteristics of the CNTRC RPB structures are discussed by carrying out the parametric studies.

关键词： 森林公园   资源调查   景观评价   功能分区   发展策略  

摘要： 以江西鄱阳莲花山国家森林公园为研究对象,对该森林公园内的森林风景资源进行了调查评价,对其进行功能分区及核心景观区、一般游憩区、管理服务区、生态保育区等进行了发展定位,提出了森林公园发展策略。