我国急缺矿产资源战略储备量的确定

中国急需分步实施、建立适合自身发展的急缺矿产资源战略储备体系,作为其基础的战略储备量的合理确定应先行.文章在分析急缺矿产资源战略储备量常用确定方法的基础上,利用现实可供量与趋势需求量的波动关系构建了急缺矿产资源战略储备量的确定模型,并以精炼铜为例进行了演示,初步确定2008年底中国精炼铜战略储备的合理规模为46.11万...     

浅谈企业的库存管理

在提出库存概念，分析不合理库存造成的代价，阐述如何正确理解库存控制的基础上，提出了降低库存的一些做法。     

漂塘钨锡矿区矿体的重新圈定与储量分类

采用新颁发的《固体矿产资源/储量分类》国家标准 ,将钨锡矿区矿石品位划分为经济品位和边际经济品位 ,并将矿体储量划分为可采储量、经济基础储量、边际经济基础储量和资源量。根据所确定的品位指标 ,结合现有的探采资料 ,按照采矿方法、含脉率、产状、矿体成矿期次的不同对矿体进行了重新圈定和计算。     

中国黄金储备合理规模研究

中国经济持续增长,外汇储备迅猛增加,但外汇储备资产中货币错配、结构失衡现象特别明显,黄金储备只有1 054.1 t,仅占外汇储备的1.8%,不仅远低于西方发达国家水平,也远低于国际平均水平。文中分析了中国外汇储备结构,利用马科维茨资产组合模型,探讨了中国黄金储备的合理规模。     

船采砂金矿实际开采储量计算内容与方法

船采砂金矿实际开采储量计算是砂金矿山储量计算工作重要组成部分。本文根据采金船实际开采特点,具体提出了实际开采储量计算必需的基础资料与数据,并扼要地论述了实际开采储量的计算内容与方法。     

Current concepts of coronary flow reserve for clinical decision making during cardiac catheterization

Measurements of coronary flow reserve, once used only for research, have gained wide acceptance as an additional diagnostic approach in the decision-making process of diagnostic cardiac catheterization and coronary interventions. Apart from the noninvasive determination of coronary flow reserve, intracoronary Doppler flow wires have facilitated decision making in the catheterization laboratory. Different techniques, unstandardized procedures, and data from uncomparable patient populations have remained a confounding factor. This review examines current concepts of coronary flow reserve as well as methodologic considerations and pitfalls. Applications of coronary flow reserve for periinterventional assessment are evaluated on the background of practical guidance. According to a detailed examination of arterial structure and function, a normal coronary flow reserve exceeds a value of 3.0. Values below 3.0 suggest involvement of microvascular disease caused by functional or structural alterations. The influences of various factors such as age, hemodynamics, hypercholesterolemia, hypertrophy, hypertension, syndrome X, and coronary artery disease are discussed in relation to the effect on coronary flow reserve. From available information, measurements of coronary flow reserve are an adjunct to current interventional technology to optimize individual patient care. Further efforts should be undertaken to incorporate these new methods into our routine clinical decision making.     

Should we apply assisted reproduction technology to women without limitations of age?

The decline of female fertility with increasing age is due to a physiological diminution of the ovarian reserve of follicles. Hence, a reliable evaluation of the ovarian reserve before performing assisted reproductive technology in aged women provides them and the physician with information about the actual probabilities of pregnancy. Patients aged over 38 years should be accepted in assisted reproduction programs only after confirmation of a healthy ovarian reserve. Patients aged more than 42 years, even in case of a normal ovarian reserve assessment, should be only accepted in selected cases. After 42 years until 46 of age, techniques of in vitro fertilization with oocyte donation may represent an alternative chance of pregnancy to aged women.     

国外稀土等矿产资源储备的几点启示

简要介绍了国外稀土等矿产资源储备现状，分析了国外矿产资源储备目的，储备制度，储备目标和调整，储备管理的执行机构，储备专项资金筹措等，提出了我国建立和完善稀土战略储备制度的建议．     

谈企业后备干部管理中存在的问题及解决措施

当前企业后备干部管理工作中在一定程度上存在着思想认识不足、目标规划不明确、选拔程序不合理、管理机制不健全、培养使用相脱节等问题。为做好后备干部的管理工作，企业领导应在思想上高度重视；严格按规定开展这项工作；树立正确的用人观念，加大培养力度；并应做为考核企业领导班子政绩的一个重要指标。     

齐波夫定律在遂昌金矿矿产预测中的应用

应用齐波夫定律，利用已经查明的金矿产储量，建立齐波夫定律预测数学模型；对未知金矿产储量进行定量预测，为找矿勘探提供理论依据．     

我国实施稀土资源储备的现实困境与出路

基于国内外稀土资源形势、国家安全和增强国际市场话语权的需要,我国有必要实施稀土资源储备战略,但我国稀土资源储备面临着相关法律制度缺失、与地方经济发展矛盾、缺少资金支持以及稀土进口国对“出口配额管制”反对等困境.为此,应从构建稀土资源储备法律制度、完善储备方式、加强稀土资源储备资金保障和建立稀土资源矿产地储备补偿制度等方面寻找出路.      

如何评价现代经济中的黄金储备

20世纪70年代后，黄金储备在储备体系中的地位逐步下降，黄金储备已不是货币稳定的基础，各国中央银行减持黄金储备已成为必然，而且现有的黄金储备对黄金市场金价的走势也会产生巨大的影响。     

增加黄金储备规避外汇风险

近几年，我国外汇储备逐年增加，而美元汇率偏弱，使我国承担很大的外汇风险。为了规避外汇风险，应增加黄金储备。文中提出了我国增加黄金储备总量的理由以及增加黄金储备的途径。这些建议具有可操作性，可以提供给有关部门参考。     

山东灵雀山金矿床深部成矿预测标志

山东灵雀山金矿床是近期在大面积变质岩区新发现的,深部或外围是否还存有隐伏矿体则显得较为重要,通过综合地质找矿标志的建立,已控制储量为112．22kg,预测储量155．490kg。     

“稀土企业可持续发展风险准备金制度”释义——基于当前几种制度的辨析

针对稀土产业生产经营的外部性特征,如环境污染、可持续发展困境等,建立稀土企业可持续发展风险准备金制度是非常有必要的.文中立足于对＂风险＂、＂保证金＂、＂可持续发展基金＂等制度的辨析,提出了＂稀土企业可持续发展风险准备金制度＂这一创新性概念,并从内涵和外延角度进行了释义,认为风险准备金属于稀土企业,不仅可以保证稀土企业充足的现金流,保证企业的可持续发展,促进资源合理开采和利用,也可以防止稀土企业将私人风险转化为公共风险,并能充分体现政府的宏观调控意图.     

Growth inhibition of human tumor cell lines by antisense oligonucleotides designed to inhibit p120 expression

Using a rat model of short- (4 weeks) and long-term (10 weeks) ascending aortic banding and debanding, we examined the relationship between coronary dilator reserve and morphological vascular changes. After 4 or 10-week banding, in vivo systolic left ventricular pressure and ventricular wt/body wt ratio increased to a similar level, compared with controls. The coronary dilator reserve measured in an isolated heart preparation decreased similarly in the two banded groups, compared with controls. The ratios of medial to luminal area and perivascular collagen to luminal area in coronary microvessels increased in the banded groups. At 4 weeks after debanding, cardiac hypertrophy regressed to the control level, and the duration of banding did not alter the extent of the regression. The coronary dilator reserve normalized in the group debanded after 4-week banding, but did not regress in the group debanded after 10-week banding. In both of the debanded groups, the hypertrophied media regressed completely. The increased perivascular collagen regressed almost completely in the group debanded after 4-week banding, but remained greater in the group debanded after 10-week banding than in the controls. From these results, we conclude that (i) the regression of medial hypertrophy does not always improve the decreased coronary dilator reserve, and (ii) the vascular fibrosis may be the major cause of the irreversibility of decreased coronary dilator reserve in long-term cardiac hypertrophy.     

黄金储备变动与黄金货币地位

自黄金非货币化后,各国央行调整黄金储备。其调整的目的分为二类：一类是把黄金作为商品,降低黄金储备量;另一类是充分利用黄金货币作用,使用黄金进口紧缺物资、贷款、偿还债务等。从金融机构调整黄金储备的动机与目的分析,笔者认为大部分央行并非刻意减少黄金储备,而是运用黄金货币职能,调整经济发展。     

Follicular fluid insulin-like growth factor-I and insulin-like growth factor-binding protein-1 and -3 vary as a function of ovarian reserve and ovarian stimulation

PURPOSE: Follicular fluid concentrations of insulin-like growth factor (IGF)-I, IGF-II, IGF-binding protein (BP)-1, and IGFBP-3 in 57 women undergoing in vitro fertilization and embryo transfer were examined to determine whether levels reflected differences in patients' exposure to gonadotropin stimulation and a diminished ovarian reserve. METHODS: Preovulatory follicular fluid was obtained from both gonadotropin-stimulated and unstimulated cycles. Subjects were grouped according to normal or decreased ovarian reserve and whether or not they received gonadotropin stimulation. RESULTS: The mean follicular fluid concentrations of IGF-I and IGFBP-1 were significantly lower in the "decreased" ovarian reserve group compared with the "normal" ovarian reserve group, with no change in estradiol or IGF-II levels. This resulted in a decreased molar IGF-I: BP ratio and an increased molar IGF-II:IGFBP-1 ratio. In unstimulated cycles, mean follicular fluid concentrations of IGFs did not differ significantly compared with those in stimulated cycles, whereas concentrations of IGFBP-1 and IGFBP-3 were significantly lower, leading to higher molar ratios of the IGFs to the binding proteins. CONCLUSIONS: Follicular fluid IGF and binding proteins vary as a function of ovarian reserve and gonadotropin stimulation. This may reflect either differences in oocyte quality or a suboptimal follicular fluid environment.     

Kinetics of synaptic depression and vesicle recycling after tetanic stimulation of frog motor nerve terminals

We measured the time courses of two key components of the synaptic vesicle cycle during recovery from synaptic depression under different conditions, and used this and other information to create a kinetic model of the vesicle cycle. End plate potential (EPP) amplitudes were used to follow recovery from synaptic depression after different amounts of tetanic stimulation. This provided an estimate of the time course of vesicle mobilization from the reserve pool to the docked (readily releasable) pool. In addition, FM1-43 was used to measure the rate of membrane retrieval after tetanic stimulation, and the amount of membrane transferred to the surface membrane. This provided a measure of the rate of refilling of the reserve pool with recycled vesicles. The time courses of both synaptic depression and endocytosis were slowed by prolonged tetanic stimulation. This behavior could be fitted by a simple model, assuming a first-order kinetics for both vesicle endocytosis and mobilization. The results show that a nearly 20-fold decrease in the rate constant of endocytosis greatly delays refilling of the depleted reserve pool. However, to fully account for the slower recovery of depression, a decrease in the rate constant of vesicle mobilization from the reserve pool of about sixfold is also required.     

黄金矿山储量管理信息系统的研究与实现

在对储量管理业务流程分析的基础上,开发了黄金矿山储量管理信息系统,并在湖北三鑫金铜股份有限公司得到了实际应用。根据系统开发实践,简要介绍系统的基本功能、开发模式、数据库设计和系统实现关键技术。