矿业权评估技术在国内矿山资源并购中的应用研究

在中国的矿产资源并购中,矿业权评估技术的应用已经成为关键的一环。通过对矿产资源的储量、品质及经济性进行科学、客观、全面的评估,可帮助投资者降低投资风险,提高并购成功率。矿业权评估技术的方法包括综合信息分析法、收益法、市场方法、成本法、折现现金流法、相对比较法。在中国矿山资源并购中的应用存在法律法规不完善、数据收集不全面、评估标准不完善及评估人员水平参差不齐等问题。为此,需要统一评估标准,加强数据披露,提高评估师水平,引入第三方评估机构,强化监管,充分利用新技术并积极与国际接轨,建立高效的交易平台,提高矿业权交易成功率。     

矿业权价值评估相关方法

在我国社会现代化发展水平不断提高以及各项法律法规内容不断完善的背景下,矿业权价值评估方法得到了多元化发展,所涉及的内容越来越广泛。在我国社会经济整体发展水平不断提高的环境下,在矿产行业中,矿业权交易在无形资产评估领域具有的重要性越来越高,选择的矿业评估参数和评估方法是否具有较高合理性,对矿业权评估价值具有重要影响本人针对矿业权价值评估相关方法展开详细分析,为我国矿产行业整体发展水平的进一步提高奠定坚实基础。     

矿业权价值评估相关方法

在我国社会现代化发展水平不断提高以及各项法律法规内容不断完善的背景下,矿业权价值评估方法得到了多元化发展,所涉及的内容越来越广泛。在我国社会经济整体发展水平不断提高的环境下,在矿产行业中,矿业权交易在无形资产评估领域具有的重要性越来越高,选择的矿业评估参数和评估方法是否具有较高合理性,对矿业权评估价值具有重要影响本人针对矿业权价值评估相关方法展开详细分析,为我国矿产行业整体发展水平的进一步提高奠定坚实基础。     

矿业权转让存在问题分析及对策

随着矿业的持续发展,矿业权交易随之大量涌现,交易双方因地质资源/储量、经济技术指标、评估方法等意见不同,导致矿业权价值很难确定,最终导致矿权交易项目不能顺利进行。就其原因,主要涉及地质储量备案、资源开发利用方案编制、可行性研究报告的编制、评估机构专业技术人员的水平等存在一定问题。该文针对这些问题,提出了相应的措施,以供同仁参考。     

宏观政策

国土资源部发布文件规范矿业权评估管理为规范我国矿业权评估管理,促进矿业权评估行业健康发展,近日,国土资源部制定发布《矿业权评估管理办法(试行)》、《关于规范矿业权评估报告备案有关事项的通知》、《关于规范矿业权出让评估委托有关事项的通知》3个文件。主要内容是明确管理者、管理相对人各自的权利和义务,核心是强调评估     

矿业权评估中的风险处理技术

针对当前国内尚不够成熟的矿权交易市场和矿权评估方法,通过专家调查多方位多角度地建立起隶属于矿业系统的风险因素指标评价体系,运用Ｍｏｎｔｒ Ｃａｒｌｏ模拟法和ＡＨＰ法,使风险影响因素以可靠的数量化形式融入评估计算,得出了一种比较可行的矿业权价值评估方法。     

国土资源部发布3个文件规范矿业权评估管理权力

为规范我国矿业权评估管理，促进矿业权评估行业健康发展，近日国土资源部制定发布《矿业权评估管理办法（试行）》、《关于规范矿业权评估报告备案有关事项的通知》、《关于规范矿业权出让评估委托有关事项的通知》3个文件。主要内容是明确管理者、管理相对人各自的权利和义务，核心是强调评估管理过程公开，规范矿业权评估管理权力，阳光行政。     

我国矿业权评估管理研究

分析了矿业权评估管理体系和我国矿业权评估现状，提出了促进我国矿业权评估发展的建议。     

项目价值评估方法探究

介绍项目价值评估现金流量折现法及其内在局限性;分析项目投资的实物期权特性,将项目投资看成蕴含着经济价值的实物期权,引出项目价值评估实物期权法,利用二叉树期权定价模型优化项目投资决策。     

国土资源部发出通知对矿业权评估行业实行属地化管理

近日,国土资源部发出了《关于加强矿业权评估行业管理的通知》（下称《通知》）,对矿业权评估行业实行属地化管理制度。《通知》明确了国土资源主管部门、矿业权评估行业协会的职责。     

Absorption of sodium diclofenac after ocular administration in rabbit

Sodium diclofenac (DCF, CAS 1507-79-6) is a non-steroidal anti-inflammatory drug whose activity is mainly due to an inhibitory effect on the synthesis of the prostaglandins. At present, a tendency towards its topical use in the treatment of the inflammatory state of the anterior segment of the eye as an alternative to the steroid drugs is observed. The pharmacokinetics of DCF was studied in rabbits by assessing the ocular and systemic absorption of DCF after administering DCF eye drops. The chromatographic methods available were not sensitive enough to quantify the extremely low drug concentrations which appeared in the biological fluids after ocular treatment. For this reason, the concentrations of DCF in plasma and aqueous humor were evaluated by a coupled liquid chromatography/gas chromatography (LC/GC) method. DCF was absorbed well through the cornea with the aqueous humor concentration peak being 757.8 ng/ml at 120 min. This good ocular absorption of DCF was confirmed by the concentrations observed in plasma. The presence of tramazoline (TMZ, CAS 74195-73-6) in the eye drops increases the levels of DCF in aqueous humor.     

选矿生产技术计划管理的探讨

分析与总结选矿生产技术计划的编制、下达、执行、调整管理程序,通过强化绩效考核、工艺技术标准落实、科研技改,保障计划的完成。以提升选矿技术管理水平为目标,实现选矿技术管理科学化、规范化、制度化、标准化。     

Sensitivity to a metabolite of diclofenac as a cause of acute immune hemolytic anemia

A 75-year-old woman taking the nonsteroidal anti-inflammatory drug diclofenac (DCF) presented with acute Coombs-positive hemolytic anemia and subsequently developed renal failure. A drug-dependent antibody specific for red blood cells (RBCs) could not be demonstrated by in vitro testing with DCF. However, her serum was found to contain an IgM antibody that reacted strongly with RBCs in the presence of urine from any of four subjects who had ingested DCF. The active substance in urine was isolated, subjected to high-performance liquid chromatographic (HPLC) analysis, and found to be a glucuronide conjugate of a known DCF metabolite, 4'-hydroxydiclofenac (4'-OH DCF). Negative results were obtained with four other DCF metabolites. Two 4'-OH DCF glucuronides were synthesized in vitro using a liver microsomal system. One promoted agglutination of normal RBCs by the patient's serum and was identified as the glucuronide ester of 4'-OH DCF by proton nuclear magnetic resonance (NMR) analysis. Studies with a panel of RBCs showed that the patient's antibody reacted preferentially with the e antigen of the Rh system. Acute immune hemolytic anemia in this patient appears to have been caused by sensitization to DCF modified by 4' hydroxylation and glucuronidation. This is the first reported example of immune cytopenia caused by sensitivity to a glucuronide conjugate of a drug metabolite. Since glucuronidation is a common pathway of drug metabolism, studies of the frequency with which glucuronide derivatives of primary medications cause immune cytopenia seem warranted.     

某多金属矿床中银的物相分析方法研究

根据电子探针能谱分析，相关分析，镜下鉴定及各单矿物分析结果，银绝大部份呈固溶体分散赋存于方铅矿，铜矾，铅铁矾等铅的含氧酸盐矿物中。在砂矿和岩矿中的银，铅大部份不呈矿物状态，分散状态存在于褐铁矿和锰结核中，本方法既适合该矿的各种矿石分析，也适合用于该矿选矿产品的银物相分析。     

微细粒浸染型金矿金的赋存状态研究

某金矿系属于微细粒浸染型矿床 ,矿床赋存于三叠系底部一套粉砂岩与粘土岩组成的沉积岩中 ,物质组成简单 ,自然金是唯一的有用矿物 ,金的颗粒极其微细 ,多数呈非游离不可见金 (超显微粒状金 ) ,主要赋存在毒砂、黄铁矿等硫化物中 ,次为粘土或石英中。常规光学显微镜下鉴定极为困难 ,根据矿石特点 ,采用以选择性溶解试验为主与镜下鉴定的试验相结合的研究方法 ,基本查明了金的赋存状态及工艺特性。解决了单一镜检从半定量、相对含量提高到绝对量的高标准 ,从而为选冶工艺提供更可靠的数据。     

Photoreduction of the fluorescent dye 2'-7'-dichlorofluorescein: a spin trapping and direct electron spin resonance study with implications for oxidative stress measurements

The photoreduction of 2'-7'-dichlorofluorescein (DCF) was investigated in buffer solution using direct electron spin resonance (ESR) and the ESR spin-trapping technique. Anaerobic studies of the reaction of DCF in the presence of reducing agents demonstrated that during visible irradiation (lambda > 300 nm) 2'-7'-dichlorofluorescein undergoes one-electron reduction to produce a semiquinone-type free radical as demonstrated by direct ESR. Spin-trapping studies of incubations containing DCF, 5,5-dimethyl-1-pyrroline N-oxide (DMPO) and either reduced glutathione (GSH) or reduced NADH demonstrate, under irradiation with visible light, the production of the superoxide dismutase-sensitive DMPO/*OOH adduct. In the absence of DMPO, measurements with a Clark-type oxygen electrode show that molecular oxygen is consumed in a light-dependent process. The semiquinone radical of DCF, when formed in an aerobic system, is immediately oxidized by oxygen, which regenerates the dye and forms superoxide.     

Cooperation of dopachrome conversion factor with phenoloxidase in the eumelanin pathway in haemolymph of Locusta migratoria (Insecta)

Dopachrome Conversion Factor (DCF) was found in the plasma of the locust Locusta migratoria. It has an apparent molecular mass of 85,000. Its K(m) was 0.2 mM at 22 degrees C and pH 7 with L-dopachrome as substrate. It had a high substrate specificity for L-dopachrome, methyl-L-dopachrome and L-dopachrome methyl ester but no activity on the corresponding D-isomers or on dopaminechrome. DCF was devoid of any phenoloxidase activity. Under action of DCF, L-dopachrome was converted into dihydroxyindole, which showed that a decarboxylation occured in the course of reaction. Locust DCF was inhibited by indole-3-propionic acid but not by indole-3- or indole-2-carboxylic acid. It was also inhibited by L-tryptophan in a competitive manner. Inhibition and substrate specificity suggest that a carboxyl group, either free or as a methyl ester, is necessary but not sufficient for enzyme recognition. When purified prophenoloxidase was activated and then added to dihydroxyindole either prepared by chemical synthesis or obtained by action of purified DCF on dopachrome, black pigments with a maximum absorption at 540 nm were generated. Therefore in the eumelanin pathway of locust plasma, phenoloxidase can catalyze the reaction that converts the product generated by DCF.     

Hemolytic-uremic syndrome due to deoxycoformycin: a report of the second case

A hypercalcemic patient with adult T-cell leukemia was treated with deoxycoformycin (DCF) in a dose of 5 mg/m2 daily for three days. Several days later, severe thrombocytopenia appeared abruptly and then microangiopathic hemolytic anemia ensued. Subsequently, renal failure and hypertension developed, and the patient died seven weeks after DCF therapy. Needle necropsy of the kidney showed glomerular damage including swelling of endothelial cells, mesangiolysis and segmental collapse. This is the second reported case of hemolytic-uremic syndrome due to DCF.     

萃取法精炼黄金的研究和工业实践

主要研究了用萃取法进行矿产金的精炼。用某溶剂作为金萃取剂,用某复合反萃还原剂在常温条件下进行一步还原;将箱式混合澄清槽经改进后作为萃取器。该工艺已成功用于工业化生产,年精炼能力30t以上,并可实现工艺流程的自动化控制。经专家鉴定,该项萃取精炼技术已达到国际先进水平。     

无取向硅钢表面绝缘涂层

无取向硅钢表面绝缘涂层分成有机涂层，无机涂层和半无机涂层三大类。无机涂层的基本成分是磷酸盐涂料和磷铝酸基涂料中添中胶态二氧化硅，氧化镁和硼酸。无机涂层具有良好的耐热和焊接性能，但其中冲制性和粘结性不佳，半无机涂层基本成分为磷酸盐，铬酸盐，乳胶树脂溶液，弥散促进剂和表面活性剂，其中弥漫促进剂和表面活性剂对涂层的质量具有重要作用。半无机涂层具有良好的冲制性和粘结性，但其耐热性和焊接性不及无机涂层。