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The volcanic rocks consist of trachytic basalt, basaltic latite, latite and trachyte. The characteristics of this volcanic sequence are: low TiO2 and silica saturation, high alkalis, high K2O/Na2O value and Fe2O3/FeO value, high and variable Al2O3, enrichment in Rb, Sr, Ba, Zr, U, Th and LREE.

岩石硅近饱和，全碱含量（尤其是K2O）高，K2O／Na2O、Fe2O3／FeO比值大，Al2O3含量高且变化大，TiO2含量低，富集Rb、Sr、Ba、Zr、Th、U和LREE等元素，稀土配分为轻稀土富集型，锶、铅、氧等同位素显示了岩浆的幔源特征。

American Dupont NOMEX fragrant gathers the amide paper, it is (chromatographic analysis textile fiber and short fiber) is composed of two kind of shape aromatic polyamide polymer, uses the special papermaking or the system board method, agglutinates Cheng Jibo the fibrous reticulum, undergoes high temperature high pressure processing, carries on the densification and the calendering causes them reliable to fix lowly in the same place, becomes not penetrable, electrical and mechanicalness energy level high whole.

美国杜邦NOMEX芳香聚酰胺纸，它是是由两种形态的芳香族聚酰胺的聚合物组成，使用特殊的造纸或制板方法，粘合成极薄的纤维网，经过高温高压处理，进行密化和轧光使它们牢固低固定在一起，成为不可渗透的，电气和机械性能极高的整体。

Li-ion battery is preferred in the demand of high dependency and safety because of its high energy-weight ratio, high voltage and memoryless effect .

中文摘要微小卫星的发展对其电源系统设计提出了小型化和集成化的要求，而锂离子电池以高能比，高电压和无记忆效应等优点，很好的满足这些要求。

Based on the review of the description of subtropical high and the research on its formation, fluctuation characteristics and physical mechanisms, it is found that the subtropical high is refered to the area where pressure is relatively larger. Its formation is due to the existence of mean meridional circulation that accumulates air mass to subtropical areas. The subtropical high is belt-like with meridionally non-uniform feature and this is a zonal mean point of view.

通过对副高的描述、形成及演变特征和物理机理的研究进行回顾，认为：副高是相对的气压的高值，是由于平均经圈环流的存在，使得有空气质量在副热带地区的堆积而形成的，成为带状，表现出在经度方向的不均匀，这是一种纬向平均的观点；同时，在这个平均的高压带上常常有闭合的单体存在，表现出纬向的不均匀。

The characteristic of machined surface of high speed machining aluminum alloy 7050-T7451 is researched by micrographic experiments and analysis. The formation mechanics of machined metamorphism layer has been analyzed and studied. The dislocation-energy model in machined metamorphism layer was established and applied to explain the micrographic mechanics work-hardening using the thermo-mechanical coupling deformation theory and dislocation theory. The experimental results show that the interaction of high dislocation density effect on hardening is more remarkable than that of thermal stress in high speed machining.

利用显微观察方法对铝合金7050-T7451高速铣削加工的工件表面断面和不同深度的表层的微观形貌特征进行系统的研究，确定了高速切削加工铝合金7050-T7451的表面变质层深度为30～35μm；应用位错能量研究了高速铣削加工过程的热力耦合对变质层的影响机理，并通过微观形貌观察证明：与普通切削相比，高速铣削表层塑性变形的能量和位错密度更高；建立了位错密度的加工硬化的动力学模型，研究了加工硬化的热-力耦合形成机理；对微观裂纹的形成机理进行了理论分析，证明位错密度高的高速切削过程中较低速加工更容易产生明显的微裂纹，从分子级乃至原子级的水平进一步揭示高速切削加工表面变质层的形成特征。

The digital frequency source this paper researched uses high integrated DDS chip AD9851 as frequency sources and signal mirac processors AT89C51 as system control center, it can output 10Hz-20MHz signal with high-precision and high stability frequency. The evenness of signal within the range of 10MHz is low to 0.1dB degree, and the smallest step is low to 10Hz frequency.

本课题研究的数字频率源采用高集成度DDS芯片AD9851作为频率源；以单片机AT89C51作为系统的控制中心，实现了10Hz～20MHz的高精度、高稳定度的频率输出。10MHz内信号幅度的平坦度为0.1dB、频率最小步进为10Hz。

The digital frequency source this paper researched uses high integrated DDS chip AD9851 as frequency sources and signal mirac processors AT89C51 as system control center, it can output 10Hz-20MHz signal with high-precision and high stability frequency.

毕业论文字数：15850 页数：36）摘要：随着现代电子技术的发展，高精度数字频率源在通讯、雷达、宇航、电视广播、遥控遥测、电子测量等领域得到了广泛的应用。

In order to offer some worthy consulting for the development of the high-tech enterprise of our country, this text tries to proceed the homologous research that aims at the the core competence of the high-tech enterpriseProceeding the foundation that combed to the current domestic and international research result of the core competence, Firstly, this text studied the evaluation, the cultivation and the protection of the core competence of the high-tech enterprise, nextly, proceeded the study about the develop strategy based on the core ability.

本文试图针对高新技术企业的核心能力进行相应的研究，以期为我国高新技术企业的发展提供一些有价值的参考。本文在对现有的国内外企业核心能力研究成果进行梳理的基础上，首先对高新技术企业核心能力的评价、培育和保护进行了相应的研究，接着对基于核心能力的高新技术企业发展战略进行了探讨。

In the process of construction, some special geological hazards will be met because of the great depth and long distance, such as high external waterpressure, watergushing, high geostress, rockburst, high geotemperature and nocuous gas and so on.

大埋深将使隧洞开挖施工时遭遇到如高外水压及高压涌水、高地应力及岩爆、高地温、高瓦斯有害气体等一系列地质灾害问题，这成为制约深埋隧洞建设快速发展的主要因素。

The intensity and way of the cold high atmospheric pressure center,Ф568 (the latitude at the nodical point of the 5680 geopotential meter line with the 120°E line in the 500hPa high altitude) and Ф850(the latitude at the nodical point of the 0℃ temperature lute with the 120°E line in the 850hPa high altitude) were closely related to the minimum temperature. The equation of short-term forecast of low temperature weather for Fuzhou, Xiamen and Shaowu was established by stepwise regression analysis. The detemperature rate was estimated by cloud cover, wind velocity, humidity (N20, F20, U20) at 20:00 o'clock.

通过对历史资料分析，利用逐步回归分析方法分别建立了福州、厦门和邵武三个探空站最低气温t的短期预报方程，再利用各地当晚20时的云量、风速、湿度(N20、F20、U20)值估算当晚的降温幅度、进一步对最低气温t进行短时临近预报，然后结合各地果树主栽品种及其抗低温冻害指标、及时发布低温冻害预警预告，构成了福建省冬季果树冻害低温预报预警模式。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。