二阶谱理论及在海浪研究中的应用

Ⅰ.二阶谱的性质   总被引：3，自引：0，他引：3       下载免费PDF全文

余宙文  丁平兴  孙孚 《海洋与湖沼》1993,24(5):553-559

针对目前国内对于二谱的研究及应用尚不普遍的状况，在参考国外文献以及我们已完成的有关研究基础上，系统地阐述了实过程的二阶谱，交叉二阶谱与矢量过程的旋转二阶谱，旋转交叉二阶谱的定义与概念，重点讨论了实过程二阶谱的有关性质。  相似文献   

X-射线荧光光谱法测定高炉渣和电炉渣中8种常见元素     

伊志宏  于想琼 《华东地质学院学报》2000,23(4):349-350

研究了借助熔片法制样,将高炉渣、电沪渣两种基体建于同一组工作曲线。所获曲线线性良好。分析结果与标准值或湿分析值吻合。  相似文献   

元素活动态测量的分析方法   总被引：4，自引：2，他引：2  

卢荫庥  白金峰 《物探与化探》2000,24(1):28-33

发展了元素活动态各相中11种以上元素的分析方法,讨论了提取操作和分析、测定中的关键  相似文献   

Remanent Magnetization in Portland-Cement-Based Materials     

Bidegain  J.C.  Sinito  A.M.  Rodriguez  M.E. 《Studia Geophysica et Geodaetica》1999,43(3):289-302

The purpose of this research is to demonstrate the possibility of applying one geophysical method to studying untraditional systems as is the case with Portland-cement-based materials. The research demonstrates how conventional paleomagnetic methodology can be employed in studying the mode of magnetic recording in present-day industrial materials. Portland-cement admixtures such as fly ashes and furnace slags should be discriminated, because those particles interact in soils and sediments in nature. Moreover, a better undertanding of magnetic remanent acquisition in model materials can serve to improve the interpretation of magnetic remanent acquisition in natural rocks formed a long time ago. The magnetic constituents of Portland-cement paste and mortar acquire a magnetic remanence due to their alignment with the earth's magnetic field at the casting place. This magnetization can be measured using ordinary paleomagnetic techniques. The alignment of the individual magnetic particles accounts for the intensity of the magnetic remanence, which can be increased by adding water and by vibration before setting and hardening. Blast furnace slag admixtures also add to the enhancement of the intensity of remanence. The magnetization of Portland-cement-based materials shows a near linear relationship with the water /cement (w/c) ratios employed in the experimental work; the w/c ratios range between 0.2 – 0.6 in pastes and 0.3 – 0.6 in mortar. Stable remanent magnetization was obtained during the first seven days of setting and hardening, a period necessary for magnetic particles to become locked parallel to the earth's magnetic field. The stability of magnetic remanence predicts the usefulness of the methodology in studying the properties of Portland cement and particularly in the control of iron-bearing admixtures.  相似文献   

无损钻切技术在宝钢二号高炉快速大修改造工程中的应用          下载免费PDF全文

曹友权  潘鸿宝 《探矿工程》2011,38(12):54-57

详细介绍了宝钢二号高炉快速大修改造工程中采用的无损钻切技术,即高精度水平钻孔、基础整体静力水平切割、注浆充填、抬升平移的施工方法及所用装置等。  相似文献   

Valorization of harbor dredged sediment activated with blast furnace slag in road layers     

Abdelwaheb Ben Slama  Nesma Feki  Daniel Levacher  Moncef Zairi 《国际泥沙研究》2021,36(1):127-135

The valorization solutions for dredged sediment have been the subject of a great number of investigations over the previous decades.In the current present study,treatment of polluted dredged sediment fom the commercial port of Sfax,Tunisia,is proposed.An industrial byproduct(blast furnace slag)was used to bind raw sediment for a reuse in road engineering.Following standards of this field,the raw sediment first was identified and classified according to the French technical guidance.Then an environmental assessment was applied due to the presence of heavy metals.The concentrations were measured on the raw sediment particles so as to control the binding effect on heavy metals.Sediment mixtures consisted of a mix of sand and a blast furnace slag activated with quicklime.Different mixtures were tested and some were proposed for sub-layer applications.The Sfax commercial port raw sediment is considered as a sandy loam with a very low fraction of clay.The measured concentrations of heavy metals exceed the recommended thresholds for cadmium,copper,lead,and zinc.These can induce hazardous effects in the case of their dumping into the sea.On the other hand,the concentrations of the detected elements after leaching tests run on raw sediment samples are very low compared to the thresholds;such results highlight a possible recycling of the raw sediment in subgrade layers without any negative impact.Suitable formulations were deduced for road engineering tests relying on the ratio the California Bearing Ratio index and the immediate bearing index.If the obtained ratio exceeds one,the treated sediment can be recycled and used in road layers.  相似文献   

硫脲介质-石墨炉原子吸收光谱法测定化探样品中微量银   总被引：2，自引：1，他引：1  

黄仁忠 《岩矿测试》2008,27(3):237-238

样品经王水分解,硫脲提取,石墨炉原子吸收光谱法测定化探样品中的微量银。方法检出限为0.058 ng/mL;精密度(RSD,n=6)为0.8%～5.4%;回收率为94%～105%。方法经国家一级标准物质验证,测定结果与标准值相符。  相似文献   

Research on Spatial Uniformity of Rainfall Generator     

Liu Bo  Wang Xiaolei  Kang Zhaojing  Su Teng  Zhai Dongli  Yuan Jing 《地球科学进展》2016,31(8):820-828

In order to improve the spatial uniformity of rainfall generator to natural rainfall uniformity, according to the rotation of the test platform, a rotary test platform was designed and developed, and the slip-ring was used to solve the problem of signal transmission in the process of the rotation. Besides, the relationship between rotational speed and spatial uniformity of rainfall generator was established. The results of tipping-bucket rain gauge tested in rainfall field and flow type rainfall intensity standard device testing demonstrated that rainfall generator as the rainfall accumulation and rainfall intensity of the test environment was feasible. Results showed that with the increase of the rotate speed, spatial uniformity first increased, and then decreases, and with the decrease of the test area, different speed presented different trends. When the rotational speed was 1 RPM, test area was 1.6 m×1.6 m and 1.2 m×1.2 m, its uniformity of rainfall generator reached maximum which was bigger than 95%; with the increase of the rotate speed, tipping-bucket rain gauge of RA and RI were of good consistency under the RPM 1 and RPM 2 and the RA maximum deviation reached minimum, 0.2 mm; the average of RA under flow type rainfall intensity standard device test consisted well with rotating test platform at speed RPM 1 and 2, which illustrated the rotary testing platform was consistent with the flow type rainfall intensity standard device. It showed that the method to improve the space uniformity of rainfall generator is feasible and it could find the dynamic difference of RA.  相似文献   

钒钛磁铁矿电炉渣工艺矿物学研究     

聂文林  张谦  阳小勇  丰奇成  文书明  周耀文  刘俊伯  杨秀竹 《岩石矿物学杂志》2021,40(3):542-550

以攀枝花钒钛磁铁矿电炉渣为研究对象,通过化学分析、X射线衍射及电子探针-能谱等手段对电炉渣的化学组成、矿物组成、矿物嵌布特征、元素分布情况进行了较为系统的研究,结果表明:电炉渣中有94.74%的钛赋存于黑钛石中,镁和铝主要以镁铝尖晶石形式存在,钙和硅主要存在透辉石中,而铁元素在各矿物中分布较为分散。有用矿物黑钛石主要与透辉石呈浸染关系,部分与镁铝尖晶石呈嵌布关系,同时有部分镁和铝以类质同像形式进入到黑钛石中,导致黑钛石中TiO_2含量仅82.04%。研究结果可为钒钛磁铁矿电炉渣的综合利用提供科学依据。  相似文献   

石墨炉原子吸收光谱法测定磷矿石中微量铅和铬   总被引：4，自引：2，他引：2  

杨小丽  王迪民  汤志勇 《岩矿测试》2010,29(1):51-54

应用石墨炉原子吸收光谱法测定磷矿石中微量铅和铬,优化了仪器工作参数及石墨炉升温程序,探讨了不同酸溶体系、基体改进剂及共存元素的影响。方法检出限为铅0.25μg/g,铬0.29μg/g;测定结果的相对标准偏差(RSD,n=12)在2.2%~7.0%;加标回收率为93.2%~107.7%。方法灵敏度高,干扰少,操作简便,应用于磷矿石中微量铅、铬的测定获得了满意的结果。  相似文献