基于fluent的综采工作面采空区内瓦斯浓度场研究

本文通过数值模拟采空区内瓦斯浓度场,从理论上确定了瓦斯浓度的分布情况。进而在对综采工作面瓦斯治理提供了科学的理论依据。     

Concentrated supply chain membership and financial performance: Chain- and firm-level perspectives

This study reports evidence that concentrated 3-firm supply chains achieve superior financial performance, and that supply chains’ financial performance varies systematically with measures of chain concentration and chain duration. Results from firm-level analyses suggest that the profitability benefits of supply chain relationships are captured predominantly by downstream chain members, whereas cash cycle benefits are realized throughout the supply chain. Firm-level tests also reveal that chain members’ financial performance varies systematically with measures of downstream bargaining power, downstream relationship duration, and degree of supply consolidation. The study's chain- and firm-level analyses employ data extracted from sample firms’ publicly available financial reports, including their major customer disclosures under Statement of Financial Accounting Standards Nos. 131 (1997) and 14 (1976).     

对口援疆背景下的新疆入境旅游发展研究

利用年际变动指数、地理集中指数对新疆入境旅游时空演变特征进行定量分析。研究表明:入境旅游呈现人数波动式增长,入境游客中外国游客占主导;入境旅游年际变化较大,客源市场不稳定。利用灰色系统模型GM(1,1)模型对新疆未来五年入境旅游指标进行预测,以期为新疆旅游管理部门和旅游企业提供参考。     

超细全尾砂连续充填工艺技术的研究与开发

冬瓜山铜矿采用阶段空场嗣后充填采矿法,设计生产能力13000t/d,充填能力3850m3/d,年需充填量120万立方。矿块分二步骤回采,即先采矿房,后采矿柱,为控制地压活动,采用隔三采一和隔一采一的采矿顺序。在矿石中有25%的难选矿石,为提高选矿回收率因此矿石粒级细且尾砂含硫较高,若用分级尾砂充填矿山充填材料缺口很大,同时在充填料浆中含有一定的有害气体。因此采用全尾砂高浓度连续充填和选择适宜的高强度充填胶结材料是冬瓜山铜矿实现安全文明生产,保证矿山生产能力的前提。     

同舟“共济”还是同舟“共挤”：供应链关系与成本行为

供应链关系既能发挥“协同效应”,也能发挥“侵占效应”,是影响企业成本管理决策的“双刃剑”。以2009—2020年沪深A股制造业上市公司为样本,探究供应链集中度与企业成本粘性之间的关系。实证结果发现,在供应链集中的三方关系下,制造商与供应商、客户之间更多地表现为“共济”效应,供应链集中能够通过信息机制和治理机制来抑制成本粘性。进一步研究表明,当外部宏观经济政策不确定性较低、区域发展环境较差时,供应链集中度表现出对成本粘性更强的抑制作用;此外企业财务柔性的增加也有益于促进供应链集中度对成本粘性的抑制效应;当企业为非国有企业时,供应链集中度对成本粘性的抑制效应更显著。研究结论肯定了供应链集中度发挥“共济”效应来降低成本粘性的积极作用,并进一步探讨了供应链集中度发挥“共济”作用的内外部条件,有助于企业发挥供应链关系的积极影响。     

社会融资规模作为金融宏观调控中介目标的适用性分析

本文采用2002年第1季度至2012年第2季度数据考察了三个备选的金融宏观中介目标——社会融资规模、人民币贷款和广义货币M2。图形直观分析、脉冲响应分析以及协整关系分析三种方法均表明：第一,M2不是一个理想的中介目标。第二,不论从与实体经济还是与物价指数的关系看、从中短期影响还是从长期均衡关系看,社会融资规模在三个中介目标中表现最好,建议我国以社会融资规模作为金融宏观调控的中介目标。第三,实体经济较物价指数更快受到金融宏观调控政策（中介目标变量）的影响。调控发生后,实体经济约5季后正效应达到最大,物价指数约在2至3年间响应达到最大。政策时滞对制定前瞻性的金融宏观政策具有一定指导意义。     

上市家族企业股权集中度与风险倾向、市场价值研究——基于市场化程度分组的实证

上市家族企业股权集中度与其风险倾向和市场价值之间究竟存在什么样的关系?家族集中控制到底是有利还是有弊?本文在总结现有研究的基础上,建设性地提出了以地区市场化程度作为分组变量,并且在对中小板上市家族企业数据的实证论证中得到支持。相比于其他国家的企业,转轨国家企业所面临的外部不确定性更高,所以,制度因素对企业行为的影响尤其明显。家族企业的发展和治理与外部环境的市场化程度是密切相关的,所以,它们会关注制度变迁过程中自身所面临的发展机遇,以及制度变迁对自身发展战略、投融资行为、经营决策、交易成本的影响。为了适应不同的市场化程度,家族企业会进行很多自适应的调试,其中包括家族对公司股权的集中控制。但是,在市场化程度不同的地区,股权集中对上市家族企业的影响是复杂的。在讨论中,本文也为相关部门的政策制定提出了有益的建议。     

Scarce collateral and bank reserves

If collateral for bank loans is scarce and, if as a result, access to secured loans is restricted, the allocation of resources is inefficient. In anticipation of future borrowing constraints, individuals over-invest in collateralized types of capital, and consume and invest inefficiently low levels while they are borrowing constrained. The dual counterpart of this misallocation of resources is inefficiently low interest rates. In this situation, bank reserves play a positive welfare role by adding liquidity to the economy and by increasing not only bank lending rates, but also, paradoxically, bank deposit rates. As a result, in economies with scarce collateral the optimal reserves–requirement ratio is positive.     

Prices and market structure: an empirical analysis of the supermarket industry in Chile

This article investigates empirically the relationship between market structure and consumer prices in the supermarket industry in Chile. A panel of monthly data from 16 cities in the period January 1998–September 2006 is used. We find that, the more concentrated the industry in a city, the higher the prices, while the participation of major national chains in cities tends to lower prices. In terms of magnitude, this latter effect prevails over the former. Moreover, the dominant local chain is found to behave differently depending on whether or not one of the national chains is present in the city. Finally, we find that prices rise when a national chain acquires another chain and both were previously in a city (inmerge) while if only one of the two was present (outmerge), prices fall.     

A Sraffian interpretation of classical monetary controversies

Abstract

The aim of this paper is to explore the contrasting views of inflation, exchange rate misalignments and determinants of gold flows held by different branches of the classical school during the first half of the nineteenth century. The properties of money neutrality and money endogeneity within the classical system are studied by reinterpreting these controversies through the analytical framework of the surplus approach as reconstructed by Sraffa [Production of Commodities by Means of Commodities. Cambridge: Cambridge University Press, 1960] and his followers.