共查询到20条相似文献，搜索用时 140 毫秒
1.
在ｆｘ－３８００Ｐ计算器上编制了计算程序，不仅可以简便运算岩矿分析允许相对双差，依次显示修正系数Ｃ，测定结果Ｘ，允许相对双差值Ｙ等主要参数，且可以直接获得《地质矿产实验室质量管理规范》附表Ｂ中的全部内容。 相似文献
2.
用Excel软件插入函数功能分析测试质量 总被引：2，自引：0，他引：2
以金矿样品分析、1:5万化探样品分析为例,在Excel中插入幂函数(POWER)、统计函数(COUN,AVERAGE,STDEV)及相关计算公式,计算岩矿分析允许相对双差,样品测定双差,化探分析准确度、精密度.通过插入逻辑函数(IF,OR,AND)将计算允许相对双差与样品测定双差,化探分析准确度、精密度与规范规定值自动比较,监控分析测试质量,并通过图表插入功能自动绘制化探分析日常质量监控曲线,评价分析测试质量是否达到规范要求. 相似文献
3.
《岩土力学》2020,(6)
相对安全率搭建了岩土工程确定性设计和可靠度设计安全判据的桥梁。广义可靠指标相对安全率克服了相对安全率受分布类型限制的局限,拓宽了相对安全率准则的应用范围。提出了在给定目标失效概率(或目标可靠指标)的条件下基于广义可靠指标相对安全率,标定允许安全系数的方法和流程。将所提允许安全系数标定方法应用于地基承载力安全判据研究,分别标定了传统抗力荷载比值法和强度折减法对应的地基承载力允许安全系数。通过地基承载力算例说明了不同工况下可靠指标相对安全率与广义可靠指标相对安全率的相互关系,探讨了不同参数和计算模型对地基承载力允许安全系数的影响。根据所标定的允许安全系数得到的确定性设计可行域与可靠度设计可行域相同,验证了所提方法在地基承载力允许安全系数标定中的有效性。 相似文献
4.
地下水资源评价主要解决是符合给定水质条件下的允许开采量，允许开采量的计算方法应在前即行确定，并以此指导勘探，勘探所取得的资料可以修正，识别和检验数学模型，只有经过识别和检验的数学模型，方可进行模拟计算。 相似文献
5.
根据误差理论和统计检验原理，提出用双份分析之差允许限推导出不确定度允许限的计算公式．从不确定度可以进一步判断分析数据的质量和可信度． 相似文献
6.
氢化物—原子荧光法测定大洋沉积物中的砷 总被引：14，自引：0，他引：14
试验了常用酸及还原剂用量对测定Ａｓ的影响，选择了仪器的最佳工作条件，考察了大洋沉积物中主量及常见元素对测定的干扰情况，并给出了这些元素不干扰测定的允许存在量。方法用于测定海底沉积物标准样品，结果与标准值吻合，相对标准偏差（ｎ＝１２）小于５％。 相似文献
7.
氯化钠—硝酸溶矿—化学光谱法测定化探样品中的痕量金 总被引：2，自引：0，他引：2
化探样品经灼烧去除易挥发组及有机物后，用硝酸和氯化钠分解，活性炭吸附柱分离富集，采用发射光谱分析法测定金。方法的检出限为0.25ng/g。用化探金标准物质进行测定，其结果与标准值相符，在允许误范围之内，标准物质平行测定15次的相对标准偏差为14.4%。 相似文献
8.
本文通过用２：８灰土挤密桩处理湿陷性黄土地基的几个典型工程试验成果的分析与总结，揭示了灰土桩复合地基桩土应力比值ｎ与荷载、相对应变之间的关系，给出了在允许承载力下ｎ值的大小及计算桩间土承载力和复合地基承载力的相应公式，为灰土挤密桩地基设计提出了更为方便的、切合实际的计算方法，便于工程设计人员使用． 相似文献
9.
示波极谱法测定铁矿石中微量砷 总被引：6，自引：0，他引：6
报道了H2SO4－Te(Ⅳ）－NH4I体系极谱法测定铁矿石中的微量砷。试验表明，采用HNO3、HCl混合酸分解试样，溶液中大量铁不需分离，在测定体系中Fe^3 允许存在量为6mg。方法经部级标样分析验证，结果与推荐值相符，6次测定的相对标准偏差小于14％。 相似文献
10.
重力式挡土墙抗滑稳定分析安全判据和标准 总被引：1，自引：0，他引：1
探讨水利、交通等领域挡土墙设计规范中对抗滑稳定安全系数规定的允许值的合理性,认为其相应值与国外相关规定相比偏小。从理论上分析,使用抗力除以土压力的安全系数定义计算土压力相应的强度参数是标准值,而非经分项系数或安全系数折减后的标准值,其允许安全系数宜大于边坡等同类土方构筑物的相应值。认为建立在可靠度理论指导下的分项系数方法可以从根本上摆脱在安全判据方面存在的缺陷。在假定一级建筑物的允许可靠指标为3.7、土的黏聚力和摩擦系数变异系数分别为0.2和0.1的条件下,对一个特定的算例,填土的黏聚力、摩擦系数和基底的摩擦系数分项系数标定值分别为 1.301, 1.209和 1.170,应用提出的相对安全率判据,可以发现上述的分项系数标定值具有普适意义。该成果可以为相关规范的制订提供参考。 相似文献
11.
P. A. Vassilev 《Mathematical Geology》1972,4(2):115-121
The possible (permissible) number of hurricane samples (or sections) within block boundaries is established on the basis of statistics and probability theory. The number of samples possible with hurricane-metal content is always three if the number of samples is between 20 and 500. With respect to the total number of samples, this amounts to 15.0 and 0.6 relative percent, respectively. The relative percentage of the possible samples with a hurricane-metal content decreases, consequently, with an increase in total number of samples within the block boundaries in which reserves are calculated. 相似文献
12.
用OpenGL绘制物化探数据等值线 总被引：1，自引：0，他引：1
在Visual C 6．0环境下调用OpenGL库用网格法绘制标准物化探数据等值线，以图示形式给出数据集的二维和三维方式的等值线图，并给出相应的数字高程模型图，方便用户分析和理解数值分布情况。用线性内差法计算所有网格边上的等值点，横边上的等值点到前一个最近网格点的距离存放在二维数组X中，纵边上的等值点到下一个最近网格点的距离存放在二维数组Y中。调用自编的搜索函数在网格边上搜索等值线的线头，用追踪函数对这个线头所在线上的点进行追踪，并把追踪到的等值点的坐标按顺序存放在二维数组DW中，用OpenGL中绘制Bezier曲线的方法分段连接DW数组中的等值点，并按颜色从红到蓝递变的顺序在屏幕上绘制等值线。 相似文献
13.
Two different goals in fitting straight lines to data are to estimate a true linear relation (physical law) and to predict values of the dependent variable with the smallest possible error. Regarding the first goal, a Monte Carlo study indicated that the structural-analysis (SA) method of fitting straight lines to data is superior to the ordinary least-squares (OLS) method for estimating true straight-line relations. Number of data points, slope and intercept of the true relation, and variances of the errors associated with the independent (X) and dependent (Y) variables influence the degree of agreement. For example, differences between the two line-fitting methods decrease as error in X becomes small relative to error in Y. Regarding the second goal—predicting the dependent variable—OLS is better than SA. Again, the difference diminishes as X takes on less error relative to Y. With respect to estimation of slope and intercept and prediction of Y, agreement between Monte Carlo results and large-sample theory was very good for sample sizes of 100, and fair to good for sample sizes of 20. The procedures and error measures are illustrated with two geologic examples. 相似文献
14.
Human Health Risk Assessment Model of Organic Pollution in Groundwater: Shijiazhuang Industrial Zone
In this study, a risk-based management model is developed and applied to an industrial zone. The models proposed by the United States Environmental Protection Agency and Han Bing have been improved by adding a residual ratio of volatile organic compounds (VOC) after boiling and deleting the related parameters in half-life. Using this improved model, an integrated process was used to assess human health risk level in the study area. Compared with water quality analysis, the results highlight the importance of applying an integrated approach for decision making on risk levels and water protection. The results of this study demonstrated that: (1) Compared with these permissible level standards in China (GB 3838-2002) and National Primary Drinking Water Regulations of the United States, the residents’ daily life had not been affected by the groundwater in this area (except for relative bad water quality of HB3-4 and HB3-6); (2) The typical detected organic contaminants of all groundwater samples were chloroform, carbon tetrachloride, trichloroethylene and tetrachloroethene, and the pollution sources were mainly industrial sources by preliminary investigations; (3) As for groundwater, the non-carcinogenic risk values of all samples do not exceed the permissible level of 1.0 and the carcinogenic risk values are relatively lower than the permissible level of 1.00E-06 to 1.00E-04; (4) Drinking water pathway of trichloroethylene and tetrachloroethylene mainly contribute to increasing the health risk of residents’ in study areas; (5) In terms of non-carcinogenic risk and carcinogenic risk, the health risk order for drinking water pathway and dermal contact pathway was: drinking water pathway > dermal contact pathway. 相似文献
15.
Methods used for the estimation of analytical precision commonly suffer from two deficiencies which give rise to misleading results. These are: (1) the methods take no account of changes in absolute or relative error over the concentration range, and (2) they tend for other reasons to produce optimistically-biassed results. The difficulties can be avoided by the correct use of duplicate determinations. One method presented allows precision parameters to be estimated. The other gives rise to a simple control chart for use in geochemical analysis. 相似文献
16.
Tungsten minerals (scheelite and wolframite) from two genetic types of granitoids show significant differences in REE distribution,
probably due to different material sources and origins. Tungsten minerals in granite porphyry of the crust-mantle source are
relatively high in ΣREE(1884ppm on average). Σ Ce is rich relative to Σ Y and Σ Ce/ΣY is relatively high (>1). The chondrite-normalized
REE distribution patterns are characterized by a group of rightward-inclined curves. Tungsten minerals in quartz veins intruding
the granites of crust origin have lower ΣREE (335 ppm on average). ΣY is rich relative to ΣCe and ΣCe/ΣY is relatively low
(<1). The chondrite-normalized REE distribution patterns are characterized by a group of leftward-inclined curves. So the
REE distribution patterns can be used to discriminate the sources of rock-and ore-forming materials and the genetic types
of W deposits so as to provide clues to ore prospecting. 相似文献
17.
Budzyń Bartosz Harlov Daniel E. Kozub-Budzyń Gabriela A. Majka Jarosław 《Mineralogy and Petrology》2017,111(2):183-217
Mineralogy and Petrology - The relative stabilities of phases within the two systems monazite-(Ce) – fluorapatite – allanite-(Ce) and xenotime-(Y) – (Y,HREE)-rich fluorapatite... 相似文献
18.
Henry Lehmann 《Geostandards and Geoanalytical Research》2003,27(1):99-117
The dependence of the count rate of singly charged secondary ions of the elements Mg, Si, Ca, Sc, Fe, Y, La and Lu on the bulk composition of the sample (known as the matrix effect) was systematically investigated for synthetic silicate glasses using a Cameca IMS 3f ion microprobe. Matrix elements in these samples, with the composition of a Mg-Fe-Ca pyroxene, comprised Mg, Si, Ca and Fe to which were added the minor elements Sc, Y, La and Lu (each at 0.1 atom %). The matrix dependence of all elements was determined quantitatively by ratioing their count rate response to the Ca or Fe yields of the sample. Measurements were conducted using four energy offsets: 0 eV, 40 eV, 80 eV and 120 eV (each 20 eV) with primary beam currents of between 0.5 and 3 nA. For the four minor elements investigated, a non-linear dependence of the absolute sensitivity factors on the Fe content was found at all the energy ranges studied. This matrix effect decreased with increasing secondary ion energy. For the major elements Mg, Si, Ca and Fe, linear as well as non-linear dependences of the absolute sensitivity factors on the Fe content were found, depending on the element and the energy level considered. Because of their importance in the geosciences, relative sensitivity factors of the elements under study relative to Si as reference element (in some cases also relative to Mg) were determined. For low energy ions, a Fe-dependent matrix effect also occurred. For Mg, Y, La and Lu, the matrix effect vanished for some values of the secondary ions energy range. 相似文献
19.
拉拉铜矿含矿岩系地球化学特征及其构造意义 总被引：1，自引：0，他引：1
四川会理拉拉铜矿床是我国著名大型富铜矿床,矿床的形成与古元古代河口群海相火山岩密切相关。河口群火山岩除个别样品Nb/Y较低,其他多数样品有一致高的Nb/Y比值(0.7~3.0),属碱性玄武系列;在Nb/Th-Zr/Nb和Zr/Y-Nb/Y图上,HFSE比值成分点主要投在EM1型富集地幔附近,落入洋岛玄武岩(OIB)范围;火山岩较陡的REE分布型式和"驼峰"状微量元素原始地幔标准化分配型式,以及缺乏Nb、Ta负异常,与大陆玄武岩十分吻合;岩石形成于板内裂谷环境。这些地球化学特征表明,河口群火山岩形成于陆间裂谷,来源于地幔深部,指示了矿床的火山喷流沉积成矿作用。同时,岩石大离子元素和轻稀土元素比值不太稳定,变化较大,Eu负异常与蚀变重晶石、萤石和矿化有关,还暗示了岩石遭受了后期变质作用,以及与之有关的矿床变质成矿成因。 相似文献