导致混凝土钻芯取样强度差异的因素

混凝土钻芯取样一般用在试块强度存在差异、试块数量不足、构件强度存在疑义、旧建筑物构件混凝土强度鉴定、新建筑物验收时随机抽取构件强度上。取芯法检测混凝土强度比较直观，更能反映构件混凝土强度的实际情况，在工程检测中得到广泛的应用和认可。但该法若使用不当也会出现一定问题，甚至有时会造成严重的后果。     

浅谈回弹法推定混凝土强度在水运工程上的应用

回弹法推定混凝土强度是常用的混凝土无损检测方法之一。本文通过现行有效规范中对混凝土强度推定不同方法的比较，检验水运工程现行相关规范的适用性。     

关于实体混凝土强度的检验评定

对结构实体混凝土强度的合格性检测与评定是工程质量验收环节最基本的指标要求,可以有效地提高混凝土结构的施工质量.采用不同的检测技术都可以相对科学的、现实的反映结构实体混凝土强度,不管是立方体试件的“标准养护强度”和“同条件养护强度”,还是结构混凝土的“回弹强度”和“取芯强度”,它们都是评定结构实体安全性的重要参数.通过对各类强度代表值的合理应用,来构建和完善以“实体检验”基础上新的工程质量验收与评价理论体系具有现实意义.     

玄武岩纤维在干硬性混凝土中的应用

文章通过对不同长度的玄武岩纤维进行对比试验，测试其在不同掺量条件下对混凝土抗压强度、弹性模量和劈裂强度的影响规律，并对其作用机理进行系统分析。不同长度的玄武岩纤维对混凝土抗压强度的影响规律不同，但均对混凝土抗压强度的增长有促进作用，长度为１８ｍｍ的玄武岩纤维对混凝土抗压强度的增幅效果最优。玄武岩纤维对混凝土抗压强度的最佳掺量为３.０ｋｇ/ｍ３。随掺入玄武岩纤维掺量的增加，长度６ｍｍ和１２ｍｍ的玄武岩纤维混凝土弹性模量和劈裂强度先降低后增大；长度为１８ｍｍ的玄武岩纤维混凝土弹性模量和劈裂强度随掺量的增大而提高。     

施工现场混凝土强度检测刍议

施工现场混凝土强度的检测已经成为工程施工质量检测的关键。如何通过科学的检测方式有效确保检测的准确性不仅是对工程施工质量的有效保障，也对施工企业经济利益有着重要的影响。本文就施工现场混凝土的强度检测进行了论述。     

混凝土强度对SRC节点受力性能的影响

本文建立了钢骨混凝土梁柱节点有限元模型，采用了分割体技术划分单元，对节点核心区域及附近网格划分较密，而远离节点核心区网格划分较疏，以节省资源和运算时间。通过对钢骨混凝土梁柱节点模型进行非线性有限元计算，分析了不同混凝土强度等级节点的开裂情况、型钢应力和应史及其分布情况，得出节点的承载力随着混凝土强度的提高而提高，节点区型钢的应力和应变随着混凝土的强度的提高而减少，最后对节点混凝土强度等级的选用提出了建议。     

钢纤维混凝土强度性能试验研究

通过试验研究在不同的钢纤维掺量情况下,钢纤维混凝土的抗压、劈拉、抗折强度的影响规律,从而总结出钢纤维混凝土的增强效应规律,最终确定出合理的钢纤维掺量,可以为道路桥梁等工程的实际应用提供有效参考。     

山东诸城市行政事业单位国有资产管理体制改革探讨

通过试验研究在不同的钢纤维掺量情况下,钢纤维混凝土的抗压、劈拉、抗折强度的影响规律,从而总结出钢纤维混凝土的增强效应规律,最终确定出合理的钢纤维掺量,可以为道路桥梁等工程的实际应用提供有效参考。     

结构实体混凝土强度的检验与评定

通过本试验对结构实体混凝土强度检测方法及其特点与结果的分析,我们不难发现：在实际工程中,各种强度检测方法均能体现重要作用,且其表现结果各不相同,关键是如何根据具体工程情况以及检测方法的特点来选取合适的方案.每一种强度测试结果都能对结构实体混凝土强度鉴定起到重要作用,根据前面对哈尔滨掺合料商品混凝土“标准养护试件强度”、“同条件养护试件强度”、“结构回弹强度”和“结构取芯强度”的数据研究,本人建议将“标准养护试件强度”作为伴随检验项,“同条件养护试件强度”与“结构取芯强度”二者可以根据实际情况选取,“结构回弹强度”可作为“结构取芯强度”检测时的辅助鉴定方法.     

页岩陶粒混凝土受压性能分析

研究了水胶比及筒压强度对页岩陶粒混凝土受压性能的影响.研究结果表明:同种页岩陶粒配制的页岩陶粒混凝土的立方体抗压强度随混凝土水胶比的减小而增大,当到达一定程度后,继续降低水胶比,页岩陶粒混凝土的强度上升幅度很小.以相同的体积砂率配制的粉煤灰陶粒混凝土,在相同的水胶比0.36下,随着筒压强度的增大,页岩陶粒混凝土抗压强度明显提高.     

The effect of exclusive distribution on the sales of ready-made meals in online retail

This study examines the impact of exclusive distribution on sales for online retailers and the moderating effects of product assortment (width and depth) and within-category competitive intensity on this relationship. This study used panel data for 3285 ready-made meal products which are newly introduced from August 2018 to August 2021 at a leading online grocery retailer in Korea. The random-effects panel regression was applied to test the proposed model. The results show that exclusive distribution increases sales, and this effect is intensified with greater product depth and greater within-category competitive intensity. These findings provide useful implications for retailers to increase their likelihood of success when adopting an exclusive distribution strategy. This study also contributes to expanding the scope of the literature on the effect of exclusive distribution on sales in the context of online retail.     

现浇连续箱梁支架验算及施工方案

现浇连续箱梁支架施工是连续箱梁施工的重点过程,也是保证连续箱梁施工安全性的重要条件,本文介绍了满堂脚手架作为连续箱梁支架的强度校核计算,木方,模板的受力验算等.     

The Advertising Agency Selection Process

Commercial avoidance and audience erosion are two interrelated problems that marketing executives and media planners have been aware of for more than 30 years. With the rapid advancement of technology the problem of ‘zapping’ has become even more predominant. In this article the intensity of the problem is examined and several concrete recommendations are made.     

液压滑模技术在立筒仓施工中的应用

液压滑模是一种连续成型的快速施工方法。与常规方法相比,它减少了劳动强度、加快了施工进度、节约了资源、降低了工程成本,充分体现了混凝土的连续性施工特点,所以一直在民用与工业建筑如高层民宅、烟囱、筒仓等领域中有广泛应用。本文对这一施工技术在立筒仓施工中的应用进行了阐述。     

黑龙江省国有困难企业改革现状的分析

黑龙江省经过20多年的改革发展,取得了世人瞩目的成就,但在体制转变的过程中依然存在着改革的具体措施不配套、不规范、国有企业发展缺乏国家支持等诸多问题。应该按照先改制后改造、先调整后改造、先招商后改造的程序,采取国有企业主辅分离改制、加快制度创新、制定相配套的法律、法规和可持续发展政策等多种措施,探索改革的有效途径,促进全省国企改革向纵深发展,加快东北老工业基地的振兴。     

Besting the status quo: the effect of abstract versus concrete mindsets on emotional trade-off difficulty and avoidant coping behavior

Building on past emotional trade-off difficulty and construal level research, we investigate the conditions under which consumers engage in avoidant coping behavior to reduce negative emotions that arise from trading off valued attributes (e.g., quality and price). Results from three studies offer evidence that an abstract (vs. concrete) mindset systematically decreases avoidant coping behavior (e.g., the selection of a status quo option) by reducing the intensity of the negative emotion consumers experience. This effect replicates across construal level manipulations and product categories. Thus, in addition to the harmful effects of negative emotions and coping behavior on consumer choice identified in past research, we find that an abstract (vs. concrete) mindset can help consumers make better (i.e., more normative) choices. Together, these findings have implications for marketers of new or unfamiliar products as well as products that are not incumbents or category leaders (i.e., status quo options) when consumers face difficult trade-offs.     

Trade Costs and Current Accounts

Are trade cost reductions a plausible explanation for growing global current account imbalances? I advocate that changes in trade costs affect trade and production structures, which is likely to affect national savings and investment. Explicitly adding trade costs à la Markusen and Venables into Jin's framework, this augmented model predicts that trade cost reductions affect the current account through changes in the industrial structure. Empirical evidence confirms that the interaction of trade costs and capital intensity drives current account balances. I also provide evidence that the response of current accounts to changes in trade costs depends on the capital intensity of production and on the depth of regional agreements on trade and factor mobility. Aside from the direct effect generally emphasised in standard macro‐level analysis, changes in production patterns could therefore be an additional channel of impact of regional integration on current accounts.     

The career path to instructional design project management: an expert perspective from the US professional services sector

There are well‐documented competency standards for instructional/training designers and for project managers. However, there is little research about what skills and abilities employers expect from those seeking to become instructional/training design project managers, particularly within specific industry sectors. Focusing on the US professional services sector, the sector in which firms have a global impact and in which human capital is the largest asset, this article addresses the ‘must have’ skills/competencies, characteristics and organizational conditions associated with career advancement from instructional designer to instructional design project manager by means of an expert study that is grounded in an in‐depth literature review. In addition to enhancing knowledge of instructional designers’ competency development for career advancement in the professional services sector, this study also offers some concrete recommendations and implications for research and practice.     

浅析纤维混凝土的研究开发与应用

随着建筑业的不断发展,建筑业对混凝土的需求量迅速增加,混凝土的使用量也越来越大.在现在建筑物中,几乎找不到没有使用混凝土的.但是普通混凝土抗拉强度与抗压强度比非常低,纤维混凝土克服了普通混凝土的缺点,本文主要探讨了纤维混凝土的研究开发与应用.     

建筑工程施工中混凝土施工质量控制的探讨

混凝土结构在建筑工程中占有很大的比重,在结构的安全、可靠度和耐久性方面起绝对的作用,是建筑工程的重要组成部分,其施工质量直接影响到整个工程的质量.如何控制好混凝土工程的施工质量?首先控制好原材料的质量.其次科学配制混凝土是保证质量的先决条件.因此,对混凝土的施工质量进行控制至关重要.本文对本建筑工程施工中混凝土施工要点进行了简要的分析和讨论.