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Tomography is an inverse problem of integral geometry, its practicc in linear and complete case may be found in medical diagnostics . In seismic tomography, the problem becomes more complicated because of nonlinear and incomplete data.

Tomography是积分几何的反问题,医学诊断中的CT技术是tomography的线性完全数据成像的例子,地震层析成像是tomography的非线性、不完全数据成像的例子。

To investigate the influence of st ratified characters of soil , numerical examples of single pile in representative soil st rata were studied.

为考察地基土成层性对单桩性状的影响,还对几种典型层状地基中的单桩进行了参数分析。

AFGF shows greatpotential for clinical applications for therapy of a variety of diseases, such as Parkinson'sdisease, spinal cord contusion injury, neural regeneration in reimplantation of broken-offfinger, brain ischemia, renal ischemia, myocardial infarction, occlusive vascularitis, retinalischemia, gastric ulcer and nonhealing wound and so on. We expressed human acid fibroblast growth factor gene transiently in tobacco byAgro-bacterium mediated vacuum infiltration and studied the factors, which influenced theexpression level.

人类酸性成纤维细胞生长因子(aFGF,FGF-1)是成纤维细胞生长因子超家族成员,来自于三个胚层的多种细胞都可以表达aFGF.aFGF在治疗帕金森综合症、急性脊柱扭曲性损伤、断指中神经功能重建、脑缺血、肾缺血、心肌梗塞、闭塞性脉管炎、视网膜缺血、胃溃疡及难愈合性伤口等多种临床应用方面具有巨大潜力。

The results show that a MgSnO3·H2O conversion film is formed by treatment in the stannate solution at 90℃, and the immersion test and potentiodynamic polarization show that the corrosion resistance of the AZ91D alloy is improved to some extent.

结果表明:锡酸盐转化处理后合金表面形成了以MgSnO3·H2O为主要成分的转化膜,可对合金起到一定的防护作用;转化膜由细小的球形颗粒密积而成,颗粒之间存在间隙,它可以为化学镀镍的前处理过程提供良好的吸附条件;转化膜上的化学镀镍层组织致密、无缺陷, MgSnO3·H2O转化膜在镀镍层与基体之间起到过渡作用,镀层的磷含量达到9%,与基体结合良好;在3.5% NaCl (pH=7)溶液中的动电位极化测试表明,镀镍以后的合金在阳极极化过程中发生了明显的钝化,耐腐蚀性能进一步提高,对基体起到了较好的防护作用。

Premium刘光成by the view that the macro level, on the whole of the land market, land supply is the lack of flexibility.

溢价刘光成的观点,即宏观层面上,对整个土地市场,土地供应是缺乏灵活性。

Also, Petrologic features, diagenesis and pore evolution features, and reservoir feature were worked and evaluated. The study direction of Neopaleozoic reservoir geology in this area was pointed out too.

同时,对区内砂岩储层的岩石学特征、成岩作用及孔隙演化特征和储集特征方面等进行了综合研究和客观评价,并分析讨论了今后该区上古生界油气储层地质的研究方向。

The time of the pedogenic process was in the last ice age, therefore this area was colder and drier in climate and lower in sea level than today. The main chemical process in the soil was oxidation, a period of the formation of oxide minerals such as limonite. With the deposition and covering of the marine facies layer in the postglacial period, the soil turned into diagenetic process. Consequently the chemical process in the soil was dominated by reduction and this process was the main development period for nodules of iron-manganese carbonate to form.

成土期处于末次冰期低海面、气候寒冷干燥期,土壤的化学过程是以氧化作用为主,是褐铁矿等氧化性矿物形成时期;冰后期海相层的沉积覆盖使土壤层进入成者阶段,土壤层的化学过程以还原作用为主,成岩过程是铁锰碳酸盆结核的主要生成期。

Based on the comparison of oil-rich and gas-rich sag s in the Bohai Bay basin,two main controlling factors of gas reservoir-forming are summarized: gas-rich sag s have source rock of partial humic or high maturation sapropel type;thick abnormal pressure mudstone in lower Tertiary is the cap,or "quilt".

对比研究渤海海域及周边陆地油区主要气田特征,发现渤海海域天然气成藏的主控因素有两点:存在相对富气凹陷,气源岩为偏腐殖型或高成熟腐泥型;富气凹陷的古近系发育高压异常厚层泥岩封盖层。

Tectonic condition is the key factor for igneous rock reservoir, which produce crack and improve reservoir character, abundant generating rock is the foundation for igneous rock reservoir, lithology condition is the important supplement for igneous rock reservoir, it is easy for trachyte to produce crack.

综合分析构造条件是火山岩成藏的关键,其产生的裂缝改善了火山岩储层的储集性能;充足的油源条件是火山岩成藏的基础;岩性条件是火山岩成藏的重要补充,即粗面岩容易在构造作用下形成构造裂缝,最终形成火山岩油气藏。

On the basis of the topological structure of FBB and their polymerization in borates(isolate, chain, layer and framework), a new systematic borate-classification is put forward,and all available borates are classified.

依据FBB自身的拓扑结构不同和在晶体结构中的排布方式不同(孤立、成链、成层、成三维网架)对所有可用的硼酸盐进行了系统的分类。

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As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸,那乌黑、忧郁的眼睛,她便会相信,他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失

But because of its youthful corporate culture—most people are hustled out of the door in their mid-40s—it had no one to send.

但是因为该公司年轻的企业文化——大多数员工在40来岁的时候都被请出公司——一时间没有好的人选。