太平洋牡蛎(Crassostrea gigas)精液的超低温保存研究     

韩龙江  黄雯  刘清华  纪利芹  张国范  李军  温海深 《海洋与湖沼》2014,45(5):1085-1091

筛选了六种抗冻保护剂(GLY[甘油],DMSO[二甲基亚砜],PG[丙二醇],EG[乙二醇],DMA[二甲基乙酰胺],MeOH[甲醇])及其五种不同浓度(6%,8%,10%,12%,14%,V/V)、三种稀释液(HBSS溶液,人工海水[ASW],过滤海水[FSW])、四种稀释比例(1︰1,1︰2,1︰4,1︰6)、三种添加剂(蔗糖,葡萄糖,海藻糖)、三个分步降温程序(程序A,程序B,程序C)对太平洋牡蛎(Crassostrea gigas)精液冷冻保存的影响,成功建立了太平洋牡蛎精液超低温保存方法:以10%DMSO为抗冻保护剂,HBSS溶液为稀释液,1:4的稀释比例,添加海藻糖,采用分布降温法冷冻保存太平洋牡蛎的精液,37°C水浴解冻后精液运动率达到71.27%±3.24%,显著高于其它实验组(P0.05),受精率和孵化率分别达到95.04%±1.99%、93.33%±1.33%,与鲜精(88.89%±15.16%,94.90%±0.95%)、程序冷冻前精液(95.96%±2.15%,92.67%±14.83%)差异不显著(P0.05),证明该太平洋牡蛎精液超低温保存方法可以应用于生产实践和科学研究中。  相似文献   

Radiative transfer in a static model atmosphere     

J. A. G. Aston  W.-L. Chan  D. R. Moore  I. C. Walton 《地球物理与天体物理流体动力学》2013,107(3-4):253-287

  相似文献   

Edge‐, bottom‐, and Rossby waves in a rotating stratified fluid     

Peter Rhines 《地球物理与天体物理流体动力学》2013,107(3-4):273-302

Abstract

It is found that in a rotating stratified fluid bounded by a single rigid wall, edge waves may occur at all frequencies less than or equal to N sin a (a is the angle of the wall from the horizontal and N the Brunt‐Vaisala frequency). These decay exponentially away from the boundary, in a distance of O(S) wavelengths, for α = O(1), or O(S ^‐1) wavelengths, for αS ≤ O(1), where S is the ratio of N to the Coriolis parameter f, taken for illustration to be large. The phase and energy both move with a component to the left, facing shallow water. The waves could, for example, appear as an internal tide at the continental rise or as baroclinic meandering of currents over a slope.

The low‐frequency limit, αS ? 1, is studied in detail. To allow for large scales of motion other rigid boundaries and variations in f are included. The edge (actually “bottom") waves then merge with topographic‐planetary waves as the wavelengths increase; the familiar depth‐independent mode is found to be possible in the sea for wavelengths exceeding about 450 km. The ß‐effect introduces modes complementary to that trapped at the bottom, which instead are isolated from it.  相似文献   

Combined tectonics and climate forcing for the widespread aeolian dust accumulation in the Chinese Loess Plateau since the early late Miocene     

《International Geology Review》2012,54(14):1861-1876

Currently mechanisms for the onset of the widespread aeolian dust accumulation in the Chinese Loess Plateau since 8–7 Ma remain elusive. In this study, we compile 11 records of climate (14–7 Ma) and tectonic activity of the Tibetan Plateau and its adjacent areas (15–6 Ma). The results suggest that strong tectonic activity in the northeastern Tibetan Plateau has produced massive debris and dust, which was deposited in the piedmont basins and reworked by weathering and fluviolacustrine erosion. At the same time, global cooling and uplift of the Tibetan Plateau over the period of 14–7 Ma intensified the East Asian winter monsoon and westerly winds (westerlies) while weakening the Asian summer monsoon, which led to the spread of dry land vegetation and aridification in interior China. Sediments in the piedmont basins were then exposed in the aridity and transported by the westerlies to the Chinese Loess Plateau and the North Pacific. We suggest that tectonic activity in the northeastern Tibetan Plateau and shifting global climate together triggered the widespread aeolian dust accumulation in the Chinese Loess Plateau and the North Pacific since 8–7 Ma.  相似文献   

西准噶尔晚古生代花岗岩类侵入体(40)~Ar/(39)~Ar热年代学     

李江瑜  陈宣华  丁伟翠  王志宏  陈文  李冰  黄鹏辉 《大地构造与成矿学》2016,(2):386-404

西准噶尔成矿带夹持在天山断裂与额尔齐斯断裂之间,是中亚成矿域西部的核心区域之一,广泛发育晚古生代深成岩浆活动、走滑断裂构造和斑岩铜矿、造山型金矿成矿作用。本文在西准噶尔成矿带包古图岩体、康德岩体、加曼岩体、库鲁木苏岩体、别鲁阿嘎希岩体、哈图岩体、阿克巴斯套岩体、庙尔沟岩体、克拉玛依岩体及红山岩体采集12个样品,通过黑云母和钾长石(40)~Ar/(39)~Ar阶段升温测年,给出了该地区(40)~Ar/(39)~Ar冷却年龄。其中,黑云母(40)~Ar/(39)~Ar年龄处在326~302 Ma范围内,钾长石(40)~Ar/(39)~Ar年龄为297~264 Ma,反映了西准噶尔地区晚石炭世-中二叠世的区域中温冷却历史。结合前人报道的锆石U-Pb、角闪石(40)~Ar/(39)~Ar、辉钼矿Re-Os、磷灰石裂变径迹等年龄数据,构建了西准噶尔成矿带晚古生代岩浆侵入,成矿作用与构造抬升,以及晚中生代剥露过程的整个热历史;并与区域左行走滑断裂活动的时间进行了对比,讨论了(40)~Ar/(39)~Ar冷却年龄的构造意义。  相似文献   

青南乌丽冻土区天然气水合物钻进工艺及应用研究          下载免费PDF全文

李小洋  张永勤  孙建华  梁健  王汉宝  李鑫淼  吴纪修  李宽  尹浩 《探矿工程》2016,43(6):13-17

在介绍了国内外冻土区天然气水合物勘探开发现状的基础上,针对我国青南冻土区水合物的勘探要求,设计了水合物勘探孔TK-2孔的钻孔结构,合理配置了钻探设备,采用了大直径绳索取心钻进工艺+泥浆制冷技术。同时,分析了冻土覆盖层融化扩孔和钻杆内壁结泥皮现象,并采取了相应的解决措施。野外试验结果表明,钻进台月效率达到702.07 m,全孔平均岩心采取率为93.5%,且在孔深229～234 m处岩心有冒泡助燃现象,验证了TK-2孔配套的钻进工艺是切实可行的。  相似文献   

钎焊金刚石钻头制造过程热动力学仿真          下载免费PDF全文

柳凯  赵记兰  伍亦文  卜长根 《探矿工程》2016,43(9):79-84

本文以钎焊金刚石钻头为研究对象,对它在高温钎焊炉中的生产升温过程和降温冷却成型过程热动力学理论进行了分析总结,对整个实体模型从钎焊炉中取出后的降温冷却过程进行了数值仿真模拟。分析了钎焊金刚石钻头及石墨模具装配体降温过程的温度场,及其对钎焊钻头应力场的影响,分析了石墨心模与钎焊金刚石钻头之间的应力,并把仿真数据与解析解理论计算值进行比较,验证了钎焊金刚石钻头降温冷却过程数值仿真与理论解析值具有较好的一致性。  相似文献   

Rapid cooling of the Yanshan Belt,northern China: Constraints from 40Ar/39Ar thermochronology and implications for cratonic lithospheric thinning     

《Journal of Asian Earth Sciences》2014

The Yanshan Orogenic Belt is located in the northern part of the North China Craton (NCC), which lost ∼120 km of lithospheric mantle during Phanerozoic tectonic reactivation. Mesozoic magmatism in the Yanshan fold-and-thrust belt began at 195–185 Ma (Early Jurassic), with most of the granitic plutons being Cretaceous in age (138–113 Ma). Along with this magmatism, multi-phase deformational structures, including multiple generations of folds, thrust and reverse faults, extensional faults, and strike-slip faults are present in this belt. Previous investigations have mostly focused on geochemical and isotopic studies of these magmatic rocks, but not on the thermal history of the Mesozoic plutons. We have applied ⁴⁰Ar/³⁹Ar thermochronology to biotites and K-feldspars from several Lower Cretaceous granitic plutons to decipher the cooling and uplift history of the Yanshan region. The biotite ⁴⁰Ar/³⁹Ar ages of these plutons range from 107 to 123 Ma, indicating that they cooled through about 350 °C at that time. All the K-feldspar step-heating results modeled using multiple diffusion domain theory yield similarly rapid cooling trends, although beginning at different times. Two rapid cooling phases have been identified at ca. 120–105 and 100–90 Ma. The first phase of rapid cooling occurred synchronously with widespread extensional deformation characterized by the formation of metamorphic core complexes, A-type magmatism, large-scale normal faults, and the development of half-graben basins. This suggests rapid exhumation took place in an extensional regime and was a shallow-crustal-level response to lithospheric thinning of the NCC. The second phase of rapid cooling was probably related to the regional uplift and unroofing of the Yanshan Belt, which is consistent with the lack of Upper Cretaceous sediments in most of the Yanshan region.  相似文献   

晚第四纪南海北部陆坡沉积物常量元素比值对气候变冷事件的指示意义   总被引：2，自引：1，他引：1  

张俊  孟宪伟  王湘芹 《海洋学报》2013,35(4):106-111

南海北部陆坡柱状沉积物的常量元素统计分析表明, 沉积物中的Ti、Al、Fe、K、Mn、Mg代表了陆源元素组合;而消除粒度效应的陆源元素比值Al/Ti、Fe/Ti和K/Ti等的变化曲线与浮游有孔虫氧同位素曲线对比表明, 在气候变冷事件(Heinrich事件、Younger Dryas事件、PME斜室普林虫低值等事件)期间, 陆源常量元素比值明显降低。这一对应特征, 一方面体现了气候变冷事件的发生对陆源区化学风化强度的制约, 另一方面也说明与指示长时间尺度气候相似, 陆源元素比值对短时间尺度的气候变化也具有明显的指示作用。  相似文献   

The abundance profile of CO in Neptune's atmosphere     

Brigette E. Hesman  Gary R. Davis  Glenn S. Orton 《Icarus》2007,186(2):342-353

The J = 3-2 rotational line of CO in Neptune has been measured using the heterodyne receiver B3 at the JCMT. The spectral resolution was 1.25 MHz and 25 tunings were used to cover a frequency range of almost 20 GHz. The measured line shape, encompassing both the broad absorption feature arising in the lower atmosphere and a narrow emission core from the upper stratosphere, indicates that the CO mole ratio is not uniform with altitude, with best-fit values of in the upper stratosphere and 0.6±0.4×¹⁰⁻⁶ in the lower stratosphere and troposphere. The higher stratospheric abundance indicates that a dual, internal and external, origin of CO is most likely.  相似文献