机制砂的性能及其对混凝土性能的影响

以往对混凝土的研究,土木工作者把更多的注意力放在了水泥、水灰比、外加剂以及粉煤灰和硅灰等外掺材料上。集料也是混凝土的重要组成部分,在混凝土中占有很重要的地位。随着土木建设的日趋发展和完善,天然砂日益紧缺,我们应重新审视集料对混凝土性能的影响。本文就着手研究用机制砂取代河砂对混凝土性能的影响。     

知识密集型组织的不确定性控制

随着知识密集型产业的发展,越来越多的企业面临着传统管理技术无法控制的不确定性。从表现、来源、可测性3个角度对不确定性进行了分类,提出了3种控制不确定性的能力——信息能力、沟通能力、适应能力。由于边际效应的限制,在高度不确定条件下,所有不确定性均归于不可知不确定性,要求企业必须发展适应能力,但由于经济效益的限制,总是优先发展适应能力是不经济的。通过一个坐标象限图,提出了不同不确定组合下组织最优资源投入的选择。     

私人生活、公共空间与信仰实践——以云南福贡基督教会为中心的考察

在云南福贡的傈僳村寨中,基督教不仅为傈僳村民提供了神学意义上的个人救赎,还全面渗入了他们的个体和家庭生活中,在重要的人生仪式和日常生活中有着直接的参与。更为重要的是,作为一个社群的基督教会本身就构成了一个乡村社会中日益稀缺的公共生活空间,并在乡村社会的具体运作中构成了社区互动和治理的组织基础和资源。     

Company name fluency and acquisition target analysis

This paper investigates the impact of company name fluency on acquisitions. We hypothesize that a company's name fluency, used by potential acquirers as a mental shortcut, influences not only its visibility to investors but also the level of interest from potential acquirers, increasing the company's acquisition probability. After correcting for endogeneity, company name fluency is positively associated with both the probability of being an acquisition target and an acquisition premium. Reasons for a higher acquisition premium for targets with higher name fluency are identified as reduced need to hire top-tier investment banks and higher synergy.     

An agile approach for supply chain modeling

This paper proposes the generic label correcting (GLC) algorithm incorporated with the decision rules to solve supply chain modeling problems. The rough set theory is applied to reduce the complexity of data space and to induct decision rules. This proposed approach is agile because by combining various operators and comparators, different types of paths in the reduced networks can be solved with one algorithm. Furthermore, the four cases of the supply chain modeling are illustrated.     

破解现代长江航运业发展难题的思考

用科学发展观析评长江航运业现状,阐释现代长江航运业发展面临的主要问题,提出解决问题的思路。     

煤矿安全监察的利剑 --祝贺《煤矿安全监察条例》施行

国务院颁布的《煤矿安全监察条例》 ,从今年 12月 1日起正式施行。这标志着煤矿安全监察工作进入一个新的阶段。这部行政法规的出台实施 ,不仅填补了煤矿安全监察法律法规上的一个空白 ,而且为新组建的煤矿安全监察机构提供了执法依据和法律武器。为此 ,我们热烈祝贺《条例》的颁布施行。向所有为这部法规出台付出辛勤努力的同志们 ,表示由衷的敬意 !煤矿的安全生产 ,号称天字号工程 ,是事关国家财产和矿工生命安全的头等大事。党和政府历来十分关心和重视煤矿的安全生产 ,制定了“安全第一、预防为主”的方针 ,采取一系列措施 ,帮助煤矿治…     

The momentum effect on Chinese real estate stocks: Evidence from firm performance levels

This paper investigates the momentum effects under different firm performance levels for Chinese real estate stocks using quantile regression with a dummy variable estimator. This paper finds that regardless of the momentum horizon, the momentum effects are positive under high-performing individual stocks, but they are negative under low-performing individual stocks. While prior literature only finds that this asymmetric phenomenon appears under different market states, and the findings on different horizons are inconsistent. Furthermore, this paper finds that the positive (negative) momentum effect under high (low) firm performance levels is stronger than that under bullish (bearish) markets. This implies that superior (inferior) fundamental business performance and bullish (bearish) markets can cause the stock prices to go up (down); however, the effect of the former is stronger than that of the latter. Moreover, this paper finds that the relation between future returns and past turnover ratios is positively correlated under high-performing stocks, but negatively correlated under low-performing stocks. Based on the above findings, this paper regards past turnover ratios as a leading indicator of stock returns and suggests two profitable investment portfolios which are superior to the average returns of real estate stocks.     

制造企业人工智能创新如何赋能高质量发展 ——来自中国上市公司的经验证据

制造企业作为人工智能创新战略的重要载体,在经济高质量发展过程中发挥着举足轻重的作用。基于2015—2019年596家制造业上市公司数据,从组织外部竞争和内部生产要素视角,通过构建个体固定效应非平衡面板模型,探讨人工智能创新驱动制造企业高质量发展的内在机制和边界条件。结果表明：人工智能创新能够有效推动制造企业高质量发展,人工智能创新双元性对高质量发展的影响无显著差异,而行业竞争能够强化人工智能创新对高质量发展的促进作用。进一步地,不同子行业人工智能创新对高质量发展的影响存在差异,劳动密集型企业和技术密集型企业人工智能创新能够促进高质量发展,而资本密集型企业人工智能创新对高质量发展的影响不显著。结论不仅有助于揭示人工智能对制造企业高质量发展的影响机制,还可为企业制定人工智能创新战略提供重要启示。