基于软件接收机的BDS/MEMS IMU深组合导航性能分析     

张学龙 《大地测量与地球动力学》2017,37(1):48-52

针对BDS/MEMS IMU深组合导航全物理实验难度较大的问题,提出一种基于软件接收机的BDS/MEMS深组合导航系统仿真分析方法。给出BDS软件接收机结构,介绍深组合导航系统结构设计及滤波算法,最后基于仿真数据进行验证。结果表明,在高动态条件下,就BDS/MEMS IMU导航系统而言,其深组合的导航精度较紧组合有较大提高,位置误差小于1 m,速度误差小于0.01 m/s。  相似文献   

Construction of a Muscle cDNA Library of Chinese Shrimp Fenneropenaeus chinensis and Sequence Analysis of the Troponin I Gene     

LI Jitao  CHEN Ping  LI Jian  LIU Ping  HE Yuying  WANG Qingyin 《青岛海洋大学学报(英文版)》2010,(1):81-86

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锦屏一级电站地下厂房岩锚梁载荷试验研究     

黄志鹏  周江平  许爱平  赫晓光  董燕君 《岩土力学》2011,32(Z1):471-0475

详细介绍了锦屏一级水电站工程地下厂房岩锚梁试验过程、安全监测方法及结果。试验结果表明,岩锚梁锚杆应力、接缝开度、围岩变形及锚索荷载变化主要由围岩二次应力调整引起的,试验荷载引起的增量远远小于各监测物理量,岩锚梁大多数锚杆承受拉应力,C锚杆的应力增量比A、B锚杆的应力增量反应更敏感;锚杆应力增量随着埋深增加迅速减小,岩锚梁荷载试验全过程中各监测物理量变化均小于设计控制标准值。建议在围岩变形较大的条件下,岩锚梁的设计、施工应考虑围岩和岩锚梁共同作用的影响  相似文献   

塔中上奥陶统方解石胶结物类型及其形成环境     

王振宇  ;吴丽  ;张云峰  ;韩剑发  ;张丽娟 《西安地质学院学报》2009,(3):265-271

通过对塔中地区上奥陶统数百块碳酸盐岩薄片和抛光面中各种方解石胶结物特征和成因的观察,并结合微量元素和碳、氧同位素分析,共识别出11种胶结物类型。详细描述了各胶结物的特征,并确定了胶结物的分布和形成次序。在此基础上对该区碳酸盐岩方解石胶结物形成环境进行了分析,共划分出海底成岩环境、大气水成岩环境和埋藏成岩环境。从而为该区孔隙演化史的建立和有利勘探目标预测提供了有力的依据。  相似文献   

Genesis of Tertiary Magnetite–Apatite Deposits,Southeast of Zanjan,Iran     

Hossein Azizi  Behzad Mehrabi  Afshin Akbarpour 《Resource Geology》2009,59(4):330-341

Magnetite–apatite deposits in the Alborz volcano–plutonic belt, southeast Zanjan, in Iran, have blade, lenzoid, and vein forms, which extend in an E‐W direction. There are many magnetite–apatite veins and veinlets in this region, and some of them are economically important, such as Zaker, Morvarid, Sorkheh–Dizaj, and Aliabad. The sizes of the vein orebodies vary between 2 and 16 m in width, 10–100 m in length, and 5–40 m in depth. Microscopic examination of thin sections and polishes indicate that they are composed of magnetite and apatite, with minor amounts of goethite, hematite, actinolite, quartz, muscovite–illite, talc, dolomite, and calcite. The geochemistry and mineralogy of the granitic host rock reveals that it is calc‐alkaline and I‐type. Field observations, mineral paragenesis, the composition of the orebodies, and the composition of the fluid inclusions in the apatite minerals with low salinity (less than 20 wt.% NaCl equivalent) indicate that these magnetite veins were hydrothermally generated at about 200–430°C and are not related to silica–iron oxide immiscibility, as are the major Precambrian magnetite deposits in central Iran.  相似文献   

塔中地区奥陶系碳酸盐岩储层裂缝发育特征及主控因素   总被引：9，自引：4，他引：5  

赵明  樊太亮  于炳松  王增香 《现代地质》2009,23(4)

主要依据塔中地区40多口钻井的奥陶系岩心裂缝观察、深浅侧向测井和FM I成像测井的响应特征等综合识别裂缝和获得裂缝特征参数。研究认为塔中地区奥陶系碳酸盐岩储层构造裂缝大量发育,以高角度缝和微裂隙最为发育,大、中缝较少,有近一半裂缝为未被充填的有效缝;平面上沿断裂带由西向东裂缝线密度变大,有效性增强;纵向上发育上奥陶统裂缝段、中—下奥陶统顶部100 m内裂缝段和深部裂缝段,中—下奥陶统顶部100 m内为裂缝集中发育段;裂缝发育程度与断裂构造和岩性关系密切,在断层发育密集区或多组断裂交汇处裂缝最发育,距离主断层或次级断层越近裂缝越发育,白云岩裂缝发育程度好于灰岩;好的裂缝发育区位于塔中地区东部多组断裂带交汇的部位。  相似文献   

Cercis siliquastrum Tree Leaves as an Efficient Adsorbent for Removal of Ag(I): Response Surface Optimization and Characterization of Biosorption     

Javad Zolgharnein  Tahere Shariatmanesh  Neda Asanjarani 《洁净——土壤、空气、水》2013,41(12):1183-1195

The Cercis siliquastrum tree leaves are introduced as a low cost biosorbent for removal of Ag(I) from aqueous solution in a batch system. FT‐IR, XRD analysis, and potentiometric titration illustrate that the adsorption took place and the acidic functional group (carboxyl) of the sorbent was involved in the biosorption process. In addition, it was observed that the pH beyond pH_pzc 4.4 is favorable for the removal procedure. The effect of operating variables such as initial pH, temperature, initial metal ion concentration, and sorbent mass on the Ag(I) biosorption was analyzed using response surface methodology (RSM). The proposed quadratic model resulting from the central composite design approach (CCD) fitted very well to the experimental data. The optimum condition obtained with RSM was an initial concentration of Ag(I) of 85 mg L^?1, pH = 6.3 and sorbent mass 0.19 g. The applicability of different kinetic and isotherm models for current biosorption process was evaluated. The isotherm, kinetic, and thermodynamic studies showed the details of sorbate‐sorbent behavior. The competitive effect of alkaline and alkaline earth metal ions during the loading of Ag(I) was also considered.  相似文献   

Water Supply Maps for the Western Front (Belgium and Northern France) Developed by British,German and American Military Geologists during World War I: Pioneering Studies in Hydrogeology from Trench Warfare     

《The Cartographic journal》2013,50(2):76-103

Abstract

Innovations for the British Army during World War I included use of a military geologist to compile 'water supply' maps and to guide well drilling. Between June 1915 and November 1918, W. B. R. King served as a staff lieutenant at General Headquarters of the British Expeditionary Force deployed on the Western Front. He pioneered British development of water supply maps for parts of Belgium and northern France, in several different styles and at scales of 1 : 100 000, 1 : 250 000 and 1 : 40 000. These assisted planning for advances into enemy-occupied territory or the development of water supply infrastructure within the region held ultimately by five British armies: in total about 1,500,000 men with some 500,000 horses and mules, each man/animal requiring on average 10 gallons (45 L) per day of potable water. The maps guided emplacement of over 470 military boreholes to supply drinking water to British forces, especially in provinces underlain by Cretaceous Chalk: Picardy and Artois. German forces also made use of military geologists at the Front, but in much greater number: up to about 300 in total. Water supply tasks were given high priority, and German water supply maps were finally standardized like other medium scale German geotechnical maps at 1 : 25 000. Six geologists were deployed with the American Expeditionary Force late in the war, and for their sector of the Front compiled at least two water supply maps at 1 : 80 000, and 11 at 1 : 50 000 that were supported by explanatory reports. Wartime imperatives thus generated expertise in hydrogeology that became available for civilian use post-war, and laid the foundation for further military development during World War II.  相似文献   

Mapping for history: the influence of the 7th Field Survey Company’s 1917 operation maps on the historiography of the 3rd Battle of Gaza     

Joel Radunzel 《制图学和地理信息科学》2013,40(6):502-517

ABSTRACT

During Palestine Campaign of World War I, the British Army’s Egyptian Expeditionary Force produced a series of operation maps to track and control the progress of their offensive into Palestine. These maps demonstrated innovation in both their form and function, and they have been referenced and reproduced by both map scholars and military historians ever since. Leaning on J.B. Harley and Matthew Edney’s ideas about critical map history, this essay provides a critical examination of these operation maps to illuminate the sociocultural context of their creation and examines the maps’ influence over the broader historiography of the Palestine Campaign. In doing so it highlights the interdisciplinary value of critical map histories.  相似文献   

塔中地区构造应力场数值模拟研究     

邱登峰  郑孟林  张瑜  张仲培 《大地构造与成矿学》2012,36(2):168-175

构造应力场研究对于油气运聚分析及储层特征描述具有重要的理论和实际意义。本文根据塔中隆起断裂特征及其演化史,结合钻井资料,选择中下奥陶统碳酸盐岩为主要研究对象,应用大型有限元分析软件ANSYS,在处理断层问题时运用非连续的接触算法,模拟了中奥陶世末、中泥盆世末、三叠纪末、新近纪末的构造应力场,研究了该区不同时期的古应力分布特征。研究表明,最大主压应力受东部车尔臣-星星峡走滑断裂影响显著,在隆起区沿断裂带呈条带状低值分布,在不同时期塔中Ⅰ号断裂带无一例外地位于最大主压应力的最低区,反映了塔中断裂带尤其是塔中Ⅰ号断裂带是油气运移的有利指向区。最小主压应力沿断裂带呈条带状高值分布,在断裂的上盘、断裂走向发生变化和断裂的倾末端是张应力高值区,为张裂缝发育的重要构造部位。最小主压应力和最大剪应力受车尔臣-星星峡走滑断裂的影响明显减弱。  相似文献