凹土对渗透结晶型防水砂浆性能影响的研究

通过介绍煅烧850℃原矿凹土对渗透结晶防水砂浆的性能影响,研究了掺0%、2%、4%、6%、8%的850℃煅烧凹土与渗透结晶防水剂复合后对防水砂浆的保水性,28d抗压强度、黏结强度以及抗渗压力的影响.试验结果表明,煅烧凹土对防水砂浆的抗渗性有显著提高,且以850℃煅烧凹土替代部分渗透结晶防水剂可以大大降低防水砂浆的成本.     

水泥搅拌桩施工工艺及质量控制分析

文章通过施工经验总结，简要介绍了软基处理中水泥搅拌桩的施工工艺及质量控制，为以后在工程施工中遇到类似的软基处理提供参考.     

关于贵州地区矿产地质勘查与找矿技术要点探讨

全球化经济不断扩大、市场竞争日益激烈,矿产资源也越来越紧缺。本文参考以往地质勘查和找矿技术研究成果,并且总结我在贵州多年的实地地质勘查工作经验,按着将贵州地区划分为不同的区域的方针,来阐述贵州地区的地质条件,并且探讨贵州地质勘查与找矿技术要点;同时就如何实现贵州地质矿产勘查的可持续发展、矿产勘查如何更好的服务经济建设进行探讨。     

长江三角洲地区的硬粘土及其成因

从颜色、矿物成分、结构、构造和古生物等方面分析硬粘土的沉积特征,重点分析了硬粘土的沉积环境和成土过程。硬粘土成土母质为末次冰期最盛期陆架沙漠化吹扬的风尘沉积,沉积物堆积在长江三角洲两翼的河漫滩上。古季风的强弱变化,使洪、枯水期交替出现。洪水期水位升高,淹没堆积在河漫滩上的沉积物;洪水期过后,沉积物开始成土过程,同时接受新的沉积,沉积始于成土的整个过程;分析了硬粘土与该区其它土壤的区别与联系。     

东北地区矿产资源产业竞争力提升研究

新世纪以来,受各种因素的影响制约,东北地区矿产资源型产业改革和结构调整步伐相对滞后,成为当前体制矛盾和结构矛盾最为突出的地区.要改变这种面貌,东北地区资源产业应培植自身的优势,把重点放在对现有矿产资源产业经济基础的调整方面,既要用现代高技术改造和提升原有传统产业,又要不失时机地发展新兴产业和市场前景看好的传统产业.     

库伦理论中粘性土等效换算的讨论

从郎肯土压力理论出发，按剪应力等效原则，推导出关于粘性土压力计算的简化方法，并得出两个土压力换算系数，该法有助于土压力计算的简化，尤其适用于库伦土压力理论在粘性土中的应用。     

西部能矿资源开发问题浅析

世纪之交，随着国务院西部地区开发会议的召开，西部大开发战略的实施问题被提上议事日程，这对于当前拉动经济增长的积极作用是不言而喻的。然而，西部大开发并非一蹴而就的易事，而是一项系统工程和长期任务，其中要面临诸如资金、技术、基础设施滞后一系列问题，必须有针对性的加以研究和解决。     

Beta spatial linear mixed model with variable dispersion using Monte Carlo maximum likelihood

We propose a beta spatial linear mixed model with variable dispersion using Monte Carlo maximum likelihood. The proposed method is useful for those situations where the response variable is a rate or a proportion. An approach to the spatial generalized linear mixed models using the Box–Cox transformation in the precision model is presented. Thus, the parameter optimization process is developed for both the spatial mean model and the spatial variable dispersion model. All the parameters are estimated using Markov chain Monte Carlo maximum likelihood. Statistical inference over the parameters is performed using approximations obtained from the asymptotic normality of the maximum likelihood estimator. Diagnosis and prediction of a new observation are also developed. The method is illustrated with the analysis of one simulated case and two studies: clay and magnesium contents. In the clay study, 147 soil profile observations were taken from the research area of the Tropenbos Cameroon Programme, with explanatory variables: elevation in metres above sea level, agro‐ecological zone, reference soil group and land cover type. In the magnesium content, the soil samples were taken from 0‐ to 20‐cm‐depth layer at each of the 178 locations, and the response variable is related to the spatial locations, altitude and sub‐region.     

重要矿产资源总量调控实施效果分析与评价--煤炭、钨、锑、锡、钼、稀土、萤石

综合分析我国煤炭、钨矿、锑矿、锡矿、钼矿、稀土和萤石等重要矿产资源总量调控实施效果：钨矿超指标生产情况严重,但价格提升,出口效益大增;锡、锑矿总量控制实施总体情况较好,但正在失去资源优势;钼矿生产年度计划指标执行较好,但各地投资热情高涨,一旦失控,将对市场形成巨大压力;稀土超指标生产势头得到遏制,虚报瞒报、走私出口问题严重。政策建议：提高总量调控监测手段;提高矿产资源开发市场的准入门槛;建立部际协调会商制度,完善管理制度体系;加快战略性矿产的储备基地建设;调整矿业税费政策;推动资源整合和企业兼并重组;加快推进国家规划矿区建设;加强法制建设;强化市场投资推动作用,抑制产能过剩。     

Determinants of Conflict Minerals Disclosure Under the Dodd–Frank Act

This paper examines conflict minerals disclosure (CMD) as mandated by the Dodd–Frank Act. We rely on a thorough content analysis conducted by the Responsible Sourcing Network on a sample of 122 firms that filed CMDs with the US Securities and Exchange Commission in 2015. We document that firms with long‐term oriented incentives, a greater number of board meetings, strong corporate governance systems and inclusion in a sustainability index are associated with higher levels of CMD. Our results suggest that in the presence of enforcement leniency, both internal and external firm‐specific factors affect strategic (non‐)compliance with a mandatory social disclosure regime. We provide implications for supply chain managers, corporate reporters and policy‐makers involved in the adoption of responsible sourcing strategies. © 2018 The Authors. Business Strategy and The Environment published by ERP Environment and John Wiley & Sons Ltd