TBM工法在台格庙矿区大埋深、长距离斜井井筒施工中适应性的研究

本文通过对国际、国内最先进的TBM隧洞施工技术分析,结合神华新街台格庙矿区工程地质及水文地质情况,创造性地将这一先进工法引入到大埋深、长距离斜井井筒施工中,开创煤矿建井历史的先河。     

榆树井近距离煤层组“两带”高度研究

为确定榆树井近距离煤层组"两带"的高度,深入研究开采覆岩破坏规律,并为合理留设露头区安全煤岩柱提供数据依据,本文以榆树井矿区近距离煤层组工作面为例,利用实测对比法、《三下采煤规程》经验公式法和综放开采"两带"公式法,预测了工作面的垮落带和裂隙带高度。结果表明:榆树井煤矿11204工作面垮落带最大高度为8.5m,垮采比5;11204工作面导水裂缝带最大高度为55.58m,按照综合采厚计算裂采比为12.43;近距离厚煤层组下组煤开采时,上层煤的底板破坏范围与下层煤的垮落带发育范围有重合区域,加剧了下层煤垮落带的高度发育。     

蒸发波导条件下海上超视距通信距离研究

大气波导的存在对海上电磁波传播产生严重影响,蒸发波导因发生概率、波导高度等特殊性对舰载微波通信装备影响尤为突出。研究了蒸发波导特征及电磁波形成波导传播条件。利用抛物线方程分布傅里叶算法计算蒸发波导条件下电磁波传播损耗,提出了基于蒸发波导条件下海上超视距通信距离估算方法及计算流程。仿真分析不同波导高度电磁波传播损耗,验证了该方法的可行性。仿真结果表明蒸发波导条件下,可实现海上微波超视距通信,能够定量估算有效通信距离,通信距离可达上百公里。研究结论对指导舰载微波频段的通信应用具有重要意义。     

Economies of scale in the Swedish sawmill industry

In this study, scale elasticity and optimal size of the Swedish sawmill industry is investigated. An input distance function is used to compute scale elasticity. The result of the study shows that the average scale elasticity is above 1, indicating existence of economies of scale in the industry. By comparing the size of the average input - output vectors with the inefficiency adjusted input vector and the output vector for scale efficient units, we could see that, in general, there are gains to be made by expansion. However, some units may gain from becoming smaller.     

长距离输水工程调度与管理机制研究

以平山水源工程为例，研究长距离输水工程的调度与管理机制，提出长距离输水管线的管理与维护措施：健全组织机构，明确管理责任；建立监控系统，保障调度安全；加强日常维护，完善检修制度。     

A Distance-Based Collective Preorder Integrating the Relative Importance of the Group's Members

In this paper, we propose an aggregation procedure, which includes two steps. In the first one, the group's members elaborate individually a preorder (total or partial) on the alternatives set. These preorders can be obtained, for example, by applying a multicriterion aggregation procedure such as ELECTRE III, PROMETHEE I or II. In the second step, these individual preorders (total or partial) are aggregated into a collective preorder (total or partial). For this purpose, we first built a distance measure between pairs of binary relations in order to quantify the divergence between two preorders. Then we determine, for each pair of alternatives, the relative importance coefficients of the group's members by using a method based on subjective and objective components. These coefficients and the distance measure are finally exploited by an iterative algorithm in order to elaborate a collective preorder synthesizing the individual preorders.     

含有模糊权值的模糊质量综合评判

针对权值的不确定性,结合L-R模糊数的近似算法,用海明距离测度工具来度量不同评语集之间的差异,提出一种新的模糊质量评判方法,该方法能够更有效处理质量综合评判中的不确定性的非量化信息。用广义的归一化方法对模糊权值和模糊评判值归一化处理,使评判结果能够落在给定的区间内。此外,含有模糊权值的模糊质量综合评判方法,可以作为基本方法应用于质量工程的研究中。     

城市群经济视角下多维邻近性与跨区域创新合作的再审视——来自科研产出的经验证据

城市群建设是否能够重塑跨区域创新合作的网络结构和空间格局?在缺乏足够理论支撑和经验证据的情况下,对这一问题的研究将为我国整体资源优化配置和创新能力提升提供重要的经验借鉴。通过采用社会网络分析法(SNA)以及空间计量模型等方法,对2000-2016年我国八大城市群内143个地级市跨区域创新合作的空间分布状况及其演化机理进行了实证研究,结果显示,城市群建设能够强化通信邻近和方言距离对跨区域创新合作的正向影响,以此来提高跨区域创新合作水平及其空间相关性。而这主要是借由高铁网络的建设以及劳动力市场一体化水平的提高而实现的。最后,在城市群建设过程中,通信邻近会逐渐弱化地理距离对跨区域创新合作的不利影响,同时加强方言距离对跨区域创新合作的正向作用,但即便如此,地理邻近对跨区域创新合作的影响依旧存在,且不容忽视。     

Adaptation to Temporal Shocks: Influences of Strategic Interpretation and Spatial Distance

Even when shocks in a firm's environment are predictable, their consequences are not. Using the relocation of the Dallas Cowboys Stadium as a rich case of such a disruption, we investigate how combinations of strategic interpretation and spatial distance influence incumbent business owners' decisions to pursue temporal adaptation as a response. Temporal adaptation (TA) comprises timing rather than content changes by the firm seeking to adjust to the reconfigured environment. Survey data from 168 business owners show that strategic interpretation directly influences TA decisions. However, the effect of strategic interpretation on the TA decision is moderated by the spatial (geographic) distance of the incumbent firm from the locus of the disruption. Furthermore, results suggest that through strategic interpretation, spatial distance also indirectly affects the business owners' decisions to make temporal changes. Data collected 1.5 and 4 years later suggest that TA responses are related to performance and may be indicative of a particular type of TA, organizational entrainment (OE), which concerns the synchronization of organizational activity cycles with cycles in the environment.     

近距离煤层采空区底板破坏特征及影响分析

针对近距离煤层开采过程过中,上层煤开采过后导致下层煤巷道围岩受扰动破坏,下层煤回采巷道围岩破碎严重、完整性较差的实际情况,利用滑移线场理论再结合部分矿场,进行实际计算不同采高时上层煤采空区底板破坏的范围,并根据两煤间距变化情况对不同状况下下层煤巷道稳定性进行分析,得出了采空区底板最大破坏深度随采高的增加而增大、两煤间距越大对下层煤巷道稳定性影响越小的结论。