综合物探方法在甘肃某金矿勘查中的应用

本文讨论了综合物探方法在甘肃某金矿勘查中的应用效果。通过在该金矿区开展激电中梯测量,研究分析了视极化率及视电阻率的特征,圈定解释了激电异常,初步推断划分了矿区地质构造。利用高密度电法剖面测量对推断的主要地质构造进行了查证。在综合研究地质、物探及化探资料的基础上,圈定了找矿靶区,为地质找矿和勘探工程布置提供了线索和依据。     

多不杂斑岩型铜矿激电中梯方法有效性试验分析

不同成矿条件下的斑岩型铜矿与周围岩石的物性参数差异是不同的,所以在进行全面物探工作前要筛选出合理的测量参数。优选在同一套测试参数下测试出的数据,选用有效数据指示找矿。本文通过分析区内各岩矿石的电性特征,选用地质资料全面的激电中梯测线,分析激电中梯有效性试验研究工作,得出视极化率对该地区找矿具有一定的指示性,而视电阻率指示效果较差,结合视极化率和视电阻率异常特征指导找矿。     

激发极化法在西藏革吉县某铜多金属矿勘探中的应用

在西藏革吉县某铜矿勘探中,其勘查区铜多金属矿属热液型矿床,岩矿石多为浸染围岩等地质和地球物理特征。运用大功率激电中梯扫面和激电测深相结合的方法进行勘查,圈出了具一定规模的矿致激电异常带三条,其结论与钻探工程揭露的已知矿化带的位置及走向一致,表明大功率激电法在本次铜矿勘探中方法正确、效果明显。     

大功率激电在内蒙古某多金属矿勘查中的应用

以内蒙古某多金属矿区找矿工程为例,利用大功率激电中梯圈定了地下蚀变矿化异常区,并使用大功率激电测深剖面对重点异常区进行重点查证,在测区圈定出了以硫化物为主的多金属矿化(蚀变)带,为工程验证提供了地质依据。     

大功率激电测深在青海某地区煤炭勘查中的应用

叙述了地质勘查中的大功率激电方法,以及在青海某煤炭勘查项目中的应用,指出此方法不仅可以获得电阻率还可获得极化率等参数,且勘探深度较大,利用实际勘查数据,给出了激电测深剖面ρs,ηs曲线。     

甘肃河西某石墨矿激电特征及找矿预测

石墨矿产在国民经济发展和现代化建设中占有重要的地位,近年全国掀起了勘查石墨矿的热潮。本文介绍了激发极化法在甘肃某石墨矿勘查中的成功应用效果。工作中利用激电中梯测量圈定了有利激电异常区,以激电测深法大致查明了激电异常体的空间分布特征。结合地质、钻探验证资料就找矿效果进行了初步探讨,总结提出了地质、地球物理找矿标志,初步建立了该区石墨矿勘查地质—地球物理找矿模型。     

时间域激发极化法在内蒙古小牛群铜多金属矿的应用

隐伏矿床由于埋藏深度大,地下地质构造特征复杂,因此隐伏矿床的勘查不仅需要地质成矿理论的指导,还需要地球物理技术获得矿体的深部异常信息。本文介绍了激电中梯和激电测深在内蒙古小牛群铜多金属矿区的应用,激电中梯扫面可以快速高效的发现和圈定矿致异常,激电测深可以确定矿体的埋深和空间赋存状态。通过地质资料和钻孔查证,发现本地区中高极化率异常与铜多金属矿有良好的空间对应关系,为进一步在本地区进行铜多金属矿体的勘查提供参考和指导。     

大功率激电在南京市凤凰山铜矿地质构造特征研究中的应用研究

利用大功率激电对南京市凤凰山铜矿勘查区进行电测深工作,采用等比对称四极装置进行测深工作,在勘查区内布置两条测线进行探测。对激电测深采集的数据进行分析,利用计算机软件得到视极化率反演剖面图和视电阻率反演剖面图。对图形分析认为:采用大功率激电进行勘测取得了较好的勘测结果,但实际操作过程中应考虑勘查区地形、电网的分布影响因素,对激电勘测到的异常区建议采用钻探验证。     

中梯装置主剖面非均匀场异常物理模拟及校正

通过水槽电法物理模拟研究了中梯装置主剖面非均匀场异常,并进行了校正试验,模拟研究表明：中梯装置测量剖面视电阻率需要校正,中梯装置实际测量区间可以扩展到2／3AB区间。     

激电中梯在内蒙古某金属矿勘查中的应用

介绍了激电中梯法在内蒙古某金属矿勘查中的具体应用,通过分析该矿区已有的地质、地球物理资料以及对野外测量数据的处理解释,共圈定3个激电异常区,并对异常进行了定性解释,推测了该区内极化体的分布情况,为后续找矿工作指明了方向。     

浅析高速公路工程招投标中的最低评标价法

结合目前高速公路施工项目招投标活动的实际情况,阐述了最低评标价法的概念,归纳了其优点及存在问题,对完善最低评标价法提出几点策略,以期促进招标投标市场更加规范有序。     

Place-Making in Megaprojects in Melbourne

This article analyses state-led place-making practices in Melbourne. The two levels of government that influence planning in Melbourne make much of the city as ‘culturally vibrant’ and ‘creative’, and have incorporated creative city-inspired place-making principles into many layers of the planning system. An examination of the development of two mixed-use megaprojects in central Melbourne reveals however that ideals of culturally engaging public places, and indeed of creative landscapes for middle-class consumption, wither in the face of more basic imperatives for economic development. In these case studies the ‘creative city’, no matter how the idea is interpreted, has little traction either as a set of inclusive place-making principles or as a gentrification strategy. The article concludes that the creative city-inspired place-making objectives in the planning system at both state and local levels are ambiguous in their overall intents and completely unsupported by statutory controls. Such place-making objectives as are realised are the compromised results of the interplay of uncoordinated decisions, delivered at the pleasure of the developer.     

Pathogens in septage in Vietnam

Septage is widely acknowledged as a major source of infectious pathogens while disposal of septage, and the operation and maintenance of septic tanks, is not regulated in many developing countries. Twenty untreated septage and septage sludge samples were taken from Can Tho City, Vietnam to examine their pathogen content, and indicator micro-organisms. Escherichia coli and Enterococcus spp. were detected in all samples, regardless of sludge storage time. Phages were detected in 80% of samples. Salmonella spp. were detected in 70% of the untreated septage and 60% of septage sludge samples. Concentrations of phages and bacteria tested in septage sludge after many years of tank storage were much higher than the expected levels. Helminth ova were present in 95% of untreated septage samples with an average of 450 ova l^− 1, and were detected in all septage sludge samples with an average of 16,000 ova l^− 1. Twelve varieties of helminth ova were identified. More helminth ova varieties in higher concentrations were found in septage than those reported from stool samples. The varieties' frequency ranged from 10% to 50% and Ascaris lumbricoides predominated. Results show that pathogens and indicator micro-organisms, especially helminth ova, accumulate in sludge. Thus helminth ova should be considered when septage sludge is treated and used for agriculture. Proper health protection measures must be applied for people handling septage.     

新时期广东城市化的新特点

新时期广东城市化出现以下特点:知识源导向、城市由单体向群体化发展、产业集群推动、政府主导自上而下的集约化发展、城镇化向城市化转变、由重“数量”发展向重“质量”发展的转变。     

在市场中实践在实践中学习在学习中进步--工程公司市场化进程的回顾与展望

近两年来，工程公司在提高市场竞争意识、推动市场化进程中做了大量工作，其中坚持走出去的方针是我们自我加压、推行加快市场化步伐的一个重要战略步骤。     

新形势下高校强化基建财务管理的探讨

在市场条件下高校基建财务人员在加强日常财务管理的同时,必须树立起高度的工作责任心,抓好事前监督、事中监督、事后监督三个环节,全面理解、贯彻执行《高等学校财务制度》,管好用好各项基本建设资金,提高基建财务管理水平,更好地完成高校各项基建任务,以有限的投资,最快的建设速度,获得最大的投资效益。     

Variation in property taxation in Tulsa

Conclusions It may be reasonably concluded from this study that the range of variation in these ratios of assessed to actual value are of a reasonable size for the great majority of cases. The frequency distribution of these sample ratios was not normal, however, as was assumed a process of this type would produce. On the other hand, the failure of the regression analysis to identify any significant variables which would explain these variations would tend to re-enforce the assumption that the fluctuations were indeed of a random nature.To sum it up in one paragraph, aside from a few extreme cases, the assessing process appears to give estimates which are more consistent than would be expected under the assumption that any errors would be of a random nature, but the regression analysis was unable to isolate any particular socioeconomic characteristics which would explain the variation which was present.Financial support for this research project was furnished by the University of Tulsa.     

2008年日本火灾情况

<正>1火灾总数在2008年(1～12月),日本发生的火灾总数为52 394起,与2007年相比减少了2 188起(4.0%)。这相当于平均1天大约发生143起火灾,每10min发生一起火灾。火灾类别(见表1)。     

谈城市历史保护规划的误区

由于缺乏起码的历史文化知识,忽视历史文化遗产的保护,错误的决策导致了建设性的破坏,要加强城市保护的教育,培养合格人才。     

Experiences in radon-safe building in Finland

A study was made of radon-safe buildings in 300 Finnish low-rise residential buildings using data obtained from a questionnaire study. The study also aims at finding the main defects in design and implementation and how the guidance given on radon-safe buildings in slab-on-grade houses has been followed. According to the guidelines, the prevention of the flow of radon-bearing air from the soil into the house is recommended to be carried out through installation of aluminised bitumen felt and use of elastic sealants. Second, as a precaution perforated piping should be installed in the subsoil of the floor slab. The median indoor radon concentration in the houses was 155 Bq/m3. This is 32% lower than the median of the estimated reference values. The action level of 200 Bq/m3 was still exceeded in 40% of the houses. In most houses with slab-on-grade the prevention was based only on the installation of a sub-slab depressurisation system. Sealing was performed in a low number of houses. In 80% of houses with a sub-slab piping connected to an operating fan, radon concentration was below the action level of 200 Bq/m3. In houses with piping but no fan, the corresponding fraction was only 45%. Sub-slab piping without a fan had no remarkable effect on radon concentration. In houses with crawl-space and edge-thickened slabs, radon concentrations were low. The choice of foundation system thus significantly affects the indoor radon concentration. The importance of complete and careful sealing work should be stressed in advice and guides concerning radon prevention.