甘肃省地矿局六十年地质工作综述 ——纪念甘肃省地矿局建局60周年     

张新虎  王世宇  牛洪斌  丁宏伟  刘建宏  贾志磊 《甘肃地质》2016,25(3):1-12

甘肃省地矿局建局60年来,先后完成了全省中小比例尺的区域地质矿产调查,发现并探明了资源储量世界排名第3的金川铜镍矿和白银铜矿、镜铁山铁矿、玛曲大水金矿、敦煌方山口钒矿、肃北塔尔沟钨矿、合作早子沟金矿、西和大桥金矿、肃南卡瓦铁矿、阿克塞余石山铌钽矿等为代表的大中型矿床180余处,发现各类矿产地875余处;完成了全省中小比例尺区域地质、水工环地质调查,评价了主要水源地和地质灾害的勘察;取得了一批地质科研成果,获得多项国家及省级科技成果奖励;为我国及甘肃省的经济社会发展做出了贡献。文章对甘肃省地矿局承担的基础地质调查、矿产地质勘查、水工环地质、地质科技等方面进行较系统、全面总结,对今后地质工作具有启示和借鉴意义。  相似文献   

焦页60-5HF井钻井技术          下载免费PDF全文

曾涛 《探矿工程》2016,43(7):52-58

焦页60-5HF井是处于焦石坝构造东南翼的一口页岩气水平井,该井设计井深5290 m,井斜69.30°,垂深3945.04 m,闭合位移2513.99 m。在实际施工中为确保水平段在储层中延伸,经多次调整后,最终完钻井深5235.00 m,井斜81.8°,垂深3820.56 m,水平位移2509.53 m,水平段长1775.00 m,为重庆涪陵工区垂深最深的一口水平井。实际施工中为保证井眼轨迹在储层中穿行,克服了井下工具抗高温、水平段摩阻大、定向托压、井眼轨迹防碰等诸多问题,成功完成了该井的施工任务,为该地区施工超深井提供了可借鉴的经验。  相似文献   

Seakeeping standard series for oblique seas (a synopsis)     

G. J. Grigoropoulos  T. A. Loukakis  A. N. Perakis 《Ocean Engineering》2000,27(2)

The seakeeping performance in oblique seas for a series of 72 cruiser-stern hull forms has been evaluated analytically and is presented in a systematic way. The hull form series have been created by Loukakis and Chryssostomidis (1975) by extending the principal characteristics of the Series 60 to cover usual shipbuilding practice. In that work, however, only the seakeeping performance in head seas was presented. Recently, the seakeeping performance of the Extended Series 60 was re-evaluated for both head seas and oblique seas. The complete results are presented in tabular and graphical form as a function of the principal characteristics of the ship, the Froude number (including Fn=0, missing in the original series), the non-dimensional modal wave period and the heading angle in a separate NTUA report (Grigoropoulos et al., 1994). In the present paper, the results for one case are given in tabular form accompanied by graphical representation. They include: heave, pitch, bending moment amidships, added resistance, absolute vertical acceleration and relative vertical motion at the bow and the stern regions and relative vertical velocity at stations 2 and 4 where slamming is likely to occur.  相似文献   

Entrainment of fine-grained surface deposits into new ice in the southwestern Kara Sea,Siberian Arctic     

Dirk Dethleff  Gesa Kuhlmann 《Continental Shelf Research》2009

The entrainment of bottom deposits (silt and clay) into newly formed ice was investigated in the Amderma/Vaygach flaw lead in the southwestern Kara Sea, Siberian Arctic. Fine-grained bottom deposits and sea ice sediments (SIS) were analyzed by granulometry, scanning electron microscopy and X-ray diffractometry. On average, SIS contain by a factor of four times more silt than the shelf deposits (66.7% vs. 16.3%), and the SIS clay percentage is more than three-fold of the bottom value (31.2% vs. 9.1%). Sand-sized particles are significantly less abundant in SIS compared to bottom sediment (2.1% vs. 74.6%). The preferred entrainment of silt into ice is underpinned by the enhanced silt-to-clay-ratio in SIS compared to bottom deposits. Though silt is preferably entrained into SIS, no evidence was found for preferential ice-entrainment of any silt sub-fraction (coarse, medium or fine). However, sub-angular- and angular-discoidal silt particles are favorably entrained into local sea ice. Clay mineral assemblages in SIS and shelf surface sediments match very well revealing that no individual clay mineral is preferably enriched in SIS or reduced at the bottom. The general textural, compositional and statistical match of fine-grained shelf surface deposits and SIS proves that bottom sediment is the principle source for ice-entrained material in the study area. We propose e.g. wave action and thermohaline convection to take sediment particles upward from the bottom nepheloid layer into the well-mixed 10–40 m deep water column of the Amderma/Vaygach flaw lead, and the turbulent process of suspension freezing to bring sediment particles and frazil crystals into contact, finally leading to the formation of sediment-laden ice. The role of SIS entrainment and export for local/regional shelf erosion and coastal retreat is of minor importance in the SW Kara Sea compared to other circum-Arctic shelf seas. However, the characteristic clay mineral assemblage of local SIS and bottom deposits can help identify the origin of SIS both on regional and Arctic-wide scales.  相似文献   

Bifurcation of nonlinear Kelvin wave-CISK with conditional heating in a truncated spectral model: A possible mechanism of 30–60-day oscillation at the equator     

Luo Dehai 《大气科学进展》1999,16(2):279-296

In this paper, the nonlinear Kelvin wave equations with “positive-only” nonlinear (conditional) heating at the equator are reduced to a sixth-order nonlinear ordinary differential equation by using the Galerkin spectral truncated method. The stability analysis indicates that when the heating parameter increases, the supercritical pitchfork and Hopf bifurcations can occur for the prescribed three heating profiles. Numerical calculations are made with the help of the fourth-order Rung-Kutta method. It is found that the convec-tion heating-related Hopf bifurcation can lead to limit cycle and chaotic solutions. In a wide range of heat-ing parameter, the solutions possess 30-60-day periods, and are dominated by wavenumbers one and two, especially by wavenurnber-one. In addition, the zonal winds of the low-frequency solutions have a phase reversal between the upper and lower tropospheres. Thus, it appears that the convection heating-related Hopf bifurcation might be a possible mechanism of 30-60-day oscillation in the tropical atmosphere.  相似文献   

BBVS-120型甚宽频带数字地震计典型地震波形记录特征   总被引：1，自引：1，他引：0  

梁永烨 《地震地磁观测与研究》2018,39(4):109-115

对太原基准地震台BBVS-120型甚宽频带地震计记录的不同震中距及不同类型天然地震和非天然地震波形进行分析和对比,结果表明,该地震计能够清晰记录近震、远震、极远震及爆破、塌陷等震相,对各类地震具有较好的监测能力,基本实现全频带观测,可为获得丰富的震相资料并提升地震台监测能力及速报质量,提供技术保障。  相似文献   

基于以太网的射电天文制冷接收机的监视系统     

吕金泉  陈卯蒸  李健  徐进  汪小妹 《天文研究与技术》2010,7(1)

制冷接收机是射电望远镜的核心设备,它是否正常工作直接决定望远镜观测的效果。制冷接收机的制冷温度和杜瓦真空度是反映接收机是否正常工作的最重要、最直接的指标之一。因此实现制冷接收机制冷温度和杜瓦真空度的远程实时监控,及时了解接收机是否正常工作对保证射电望远镜正常运行、提高观测效率有重要意义。为乌鲁木齐天文站25m射电望远镜1.3cm制冷接收机研制的一套基于单片机和以太网的数据采集和数据传输的远程监视系统,实现了制冷接收机制冷温度和杜瓦真空度的远程实时监控。该系统采用了美国ATMEL公司生产的8位单片机AVR ATmega16、Microchip Technology公司生产的ENC28J60以及MAXIM公司生产的MAX7219,实现对射电天文制冷接收机制冷温度和杜瓦真空度的数据采集,并利用以太网传输数据实现了远程实时监控接收机的制冷状态。阐述了以太网数据采集及远程监控电路的设计原理及其实现方法。该系统首次在国内大型射电望远镜上实现了对制冷接收机工作状态的远程实时监控,对于保证乌鲁木齐天文站25m射电望远镜1.3cm波段的观测效果有重要作用。  相似文献   

赤点石斑鱼HSP60基因克隆及弧菌应激前后的组织表达特性分析          下载免费PDF全文

曲朦  施晓峰  张之文  丁少雄 《海洋学报》2011,33(1):111-120

HSP60(heat shock protein 60,热休克蛋白60)作为高度保守的热休克蛋白家族的一员,不仅可以在应激状态下帮助其他蛋白正确折叠并恢复天然构象,还可作为危险信号作用于天然免疫系统.基于HSP60的EST序列设计特异引物,采用RACE技术成功克隆获得赤点石斑鱼HSP60 cDNA全序列及基因组全序列....  相似文献   

WRF、EC和T639模式在福建沿海冬半年大风预报中的检验与应用     

曾瑾瑜  韩美  吴幸毓  林青  廖廓 《海洋科学》2015,39(7):75-85

基于福建省冬半年沿海和港湾岛屿自动站的逐时极大风观测资料和WRF(Weather Research and Forecast)、EC(European Centre for Medium-Range Weather Forecasts)细网格以及T639(TL639L60)三种模式预报的10 m 风场资料, 将模式预报的风向风速与观测资料进行对比检验, 结果表明: 福建省沿海冬半年大风的盛行风向以东北风为主, 大风的时空分布极为不均, 沿海风力的脉动性、跳跃性、局地性突出。从三种模式对风速风向的模拟效果来看, WRF 和EC 细网格的预报效果较好, 有可参考性, T639可参考性不高。对于风速, 模式预报结果相比实况极大风速偏小, 港湾岛屿代表站风速的平均绝对误差均小于沿海代表站, 预报平均误差由沿海向内陆逐渐减小, 由中部向南北逐渐减小。风向相比风速的预报效果要差, WRF 和EC 细网格的风向预报误差在45°～50°, 有一定的参考意义; 港湾岛屿代表站风向的平均绝对误差大于沿海代表站, 以浮标站的误差最大。当观测风速出现7 级及以上风速时, 若对大风进行分级检验, 则较低风速的预报平均绝对误差小于较高风速; 风向预报的平均绝对误差也大大降低, 且误差都在45°以内, 具有良好的参考性。  相似文献   

The evolution of BD+60°2522: with mass loss and overshooting     

D. N. Dawanas  A. Wardana  H. L. Malasan 《Astrophysics and Space Science》2007,312(1-2):23-25

The ionizing star BD+60°2522 is known as the central star of Bubble Nebulae NGC 7635—wind-blown bubble created by the interaction of the stellar wind of BD+60°2522 (O6.5 IIIef, V=8.7 mag, mass loss rate 10^−5.76 M _⊙/year) with the ambient interstellar medium. From the evolutionary calculations for the star with mass loss and overshooting, we find that the initial mass of the star is 60M _⊙, its present age is 2.5×10⁶ years, and the present mass is 45M _⊙.  相似文献