远程三维云桌面系统在地震解释上的应用

从事石油开采研究经常需要在异地进行成果展示和协同工作,用传统手段不仅效果差,且对网络带宽和终端设备性能要求较高。而DCV远程三维云桌面系统具有成本低、传输效率高、应用效果好的特点,可以在低带宽条件下,利用一般配置的办公微机上实现数据中心地震工区的异地三维显示,满足科研生产的需求。     

外错式低位巷穿层抽放治理瓦斯技术

八矿探索使用外错式低位巷穿层抽放治理突出采煤工作面瓦斯,保证了采面的正规循环作业,杜绝了瓦斯超限,保证了矿井安全生产,并为以后采面的抽排巷设计提供了依据。     

Panel unit root tests under cross section dependence with recursive mean adjustment

Utilizing recursive mean adjustment (RMA) we provide two unit root tests: the covariate RMA unit root test and the panel feasible generalized RMA unit root test. The proposed panel unit root tests are precise and powerful, especially when T > N.     

中部地区实现跨越式发展的路径选择

中部六省地处祖国内陆腹地,在全国地域分工中扮演着十分重要的角色。如何有效发挥中部地区综合优势,加速在全国区域经济板块中崛起,是摆在我们面前的重大课题。文章立足中部六省现状,在深入分析中部地区拥有的各项优势后,指出后发优势战略与比较优势战略相结合,大力发展混合所     

Housing Vouchers,Tenant Quality,and Apartment Values

Landlords face unique concerns in maximizing profits when they accept subsidized as well as unsubsidized tenants. Subsidized tenants come with lower rental collection risk because part or all of the rent is paid by a public agency and accepting subsidized tenants may widen the potential tenant market. But subsidized tenants tend to reduce overall tenant quality and to impose higher operating costs. By accepting subsidies, landlords may also subject themselves to periodic site inspections that may increase capital costs. Further, subsidized tenants may eventually crowd out unsubsidized tenants, lowering the average quality of the resident mix. Tests from Washington, DC apartments on accepting and advertising for Section 8 tenants support these qualitative predictions. Accepting Section 8 tenants enhances revenues, but advertising for them lowers revenues. More aggressive solicitation of subsidized tenants leads to a crowding out or displacement risk that dominates over any diminished collection risk.     

GPS RTK技术及在架空送电线路测量中的应用

文章结合横县220kV线路测量的实践,讨论了GPS RTK技术及在送电线路测量中的应用。     

尿素车间一段分解塔筒节局部减薄原因及防范对策

对某化肥公司尿素一段分解塔筒节进行了宏观检验、仪器测量和壁厚校核。根据实际检验情况对尿素一段分解塔筒节的腐蚀原因进行了分析。结合实际情况对尿素一段分解塔筒节的修理和使用提出了防腐措施。     

鹤煤二矿二部猴车支护整修及保运行方案

鹤煤二矿井下地质条件复杂,井下普遍压力较大、巷道变形严重,如不及时采取措施,二部猴车随时面临停运、瘫痪的可能。通过该方案的实施,整修期间没有出现任何工伤事故,而且巷道整体面貌焕然一新,为今后特殊支护段巷道整修积累了宝贵经验。     

ECONOMETRICS FOR GRUMBLERS: A NEW LOOK AT THE LITERATURE ON CROSS‐COUNTRY GROWTH EMPIRICS

Abstract Since the seminal contribution of N. Gregory Mankiw, David Romer and David N. Weil in 1992 the growth empirics literature has used increasingly sophisticated methods to select relevant growth determinants in estimating cross‐section growth regressions. The vast majority of empirical approaches, however, limit cross‐country heterogeneity in production technology to the specification of total factor productivity, the ‘measure of our ignorance’. In this survey, we present two general empirical frameworks for cross‐country growth and productivity analysis and demonstrate that they encompass the various approaches in the growth empirics literature of the past two decades. We then develop our central argument, that cross‐country heterogeneity in the impact of observables and unobservables on output as well as the time‐series properties of the data are important for reliable empirical analysis.     

设置动车运用所的客运站动车组走行线布置分析

车站与动车运用所的关系有多种可能，其布置形式都要遵循动车组列车运行的客观规律。以动车运用所为例，分析动车组走行线与车站布置的关系，以及机车牵引的列车与动车组列车在始发终到客运站的作业区别，并给出只衔接1条客运专线的始发终到客运站动车组走行线、和衔接多条客运专线的始发终到客运站动车组走行线的布置形式。指出只有弄清高速铁路运行规律，才能做好动车组走行线的布置。