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We adopted the spectrum analysis method and the BAYTAP-G method to analyze the geoelectric potential data at the Niijima station during 1998~2000. After the quantitative analysis of the tide reaponse of geoelectric potential changes at the above station, we obtained some main characteristics of the tide response. Besides the tidal components with various periods such as diurnal tide, semi-diurnal tide, and so on, semimonthly and semi-yearly variations of tide response were also detected from the geoelectric potential data at the Niijima station.

本文通过采用频谱分析和BAYTAP-G方法对位于日本伊豆群岛的新岛台跨度达三年（1998~2000年）的地电场的观测资料进行了分析研究，对该台地电场的潮汐响应进行了定量提取与分析，得到了地电场潮汐响应的一些主要特征，例如除了存在全日分潮、半日分潮等不同周期的潮汐成分外，还呈现出明显的半月、半年等不同周期的活动规律。

According to the computational stability analysis conducted to the linear term time difference scheme in simple harmonic motion equation, one new semi-implicit integration scheme also is designed. By adopting a kind of revised time-explicitdifference scheme to these linear terms still included in spectral model governing equations, this defect of spectral model only partly used in semi-implicit integrating scheme, can be overcome to some degree.

以简谐振动方程中线性项时间差分格式对其计算稳定性影响为理论依据，本文设计了一种新谱模式半隐式时间积分方案，此方案通过对一般谱模式求解框架中那些隐含的线性项采用了一种显式修正的差分格式，可有效克服其国际谱模式半隐式时间求积方案实质上只是部分应用了半隐式差分格式的问题。

At last, we provide the upper semi-continuity and compactness of the spectral scalar solution set mapping under some suitable conditions, and the necessary and sufficient conditions to guarantee the lower semi-continuity of the spectral scalar solution set mapping by virtue of the concept of essential solution.

最后，给出了谱标量解集映射满足上半连续且紧的充分条件及下半连续的充分必要条件。

In the first part, the opinions and ideas from some main figures concerning the North-western regions in modern history; In the second part, the process of three vital stages(Yang-Wu Movement, the "New Deal" in the last period of Qing Dynasty, Anti-Japanese War) are studied, and the characteristics of each stage are generalized falling into four categories, such as: military、feudal、comprador and nation-monopoly etc; In the third part, four reasons of the low efficiency of the industrial and mineral exploration are explored, they are the dominant role natural economy, the low level of productive forces, the science and technology, lack of capital accumulation and investment, lack of systematic policies and support from the government, In a word, as Mao Tsetung said:"It"s impossible to get rich, develop industry, strengthen national defence in semi-colonel and semi-feudal China.

全文共分四部分，第一部分论述了近代一些主要的阶级关注西北的言论和思想；第二部分对西北近代工矿业开发的三个最重要的阶段，即洋务运动时期、清末"新政"时期、抗日战争时期的开发过程做了梳理，并对每一个阶段的特点做了初步地概括，大致可以归纳为军事性、封建性、买办性以及国家垄断性等；第三部分对西北近代工矿业开发成效不高的原因做了论述，主要有四点：第一，小农业与家庭手工业紧密结合的自然经济占统治地位；第二，生产力水平低下，科学技术落后；第三，缺乏资金的积累和投入；第四，缺乏政府系统的政策支持和保障。

In this paper, a free vibration equation of the semi-rigid frame structure is built. The formula to calculate the natural periods is deduced. Furthermore, the effects of semi-rigid connection on natural periods are studied.

建立了半刚性连接框架结构的自由振动方程，推导出半刚性连接框架结构基本自振周期的计算公式，分析了连接刚度对基本自振周期的影响。

Combined with research of archaeological time and civilization stages, the physical environment change of Wuhan district during middle and late Neolithic Age is reconstructed in detail, which comes through stages of warm and humid, semi\|warm and semi\|humid, dry and cold, relatively torridity and humid, warm and humid successively.

运用植硅石分析新方法对武汉周边先秦遗址考古土壤进行分析研究，发现其中植硅石含量丰富，且具有一定的组合分带性，结合考古年代与文化期研究，揭示出武汉地区新石器中晚期( 50 0 0 - 2 70 0 a BP)气候环境变化信息，即先后经历了温湿期、温凉期、干冷期、暖湿期、温湿期。

And we show that if such a immersion is also semi-parallel, it must be totally geodesic. Moreover the same results hold for semi-symmetric submanifolds in a nontrivial complex-space-form.

我们证明了如果它还是半平行的，则它必是全测地浸入，而且这一结果对于复射影空间和复双曲空间中的半对称浸入也成立。

In late Qing Dynasty,it is the fact of the modern China's "semi-colonial and semi-feudal" societal structure that the treaty port network centered on Shanghai stood up as an equal to the traditional political capital of Beijing.

晚清时期以上海为中心的通商口岸体系与以北京为代表的传统政区体系分庭抗礼，是近代中国"半殖民地半封建"社会的结构性写照。

According to a semi-infinite truncated cone model, in Laplace space the approximate analytical solutions of the bottom surface of rigid circular plate and semi-infinite viscoelastic medium are obtained and the calculating model and formulae of seismic forces are presented.

根据半无限截头圆锥模型，在拉氏空间中获得刚性圆板底面与半无限弹性介质相互作用的近似分析解，提出了刚性圆板地震力计算模型及计算公式。

A nonlinear semi-discrete model of investment dynamic system is set,and the existence and unique of solution for semi-discrete system are discussed.

建立了投资动力系统的一个非线性半离散模型，并讨论了半离散系统解的存在唯一性，给出了线性半离散系统稳定的一些充分条件。

Cynanchum Lingtai apricot production in the average weight 65 grams, the brightly-colored fruit, juicy rich, sweet-sour taste, sweet from the nucleolus, when the late Qing Dynasty famous Shaanxi, Gansu provinces, the Qing imperial court Tongzhi tribute for years.

灵台生产的牛心杏平均单果重65克，果实色泽鲜艳，汁多味浓，甜酸适口，离核仁甜，清末时就驰名陕、甘两省，清同治年间曾为朝廷贡品。

Chenopodium album,Solanum nigrum, and Amaranthus retroflexus were very susceptible to the herbicides. Polygonum persicaria and Abutilon theophrasti were relatively less susceptible to the herbicides, and Lycopersicon esculentum was not susceptible to it. The relationship between reduction rates of weed biomass and PPM values of weed leaves 2,4, and 6 days after treatment was established.

供试的6种杂草对该混剂的敏感性存在显著差异：红心藜Chenopodium album、龙葵Solanum nigrum和反枝苋Amaranthus retroflexus对该混剂最敏感，ED90值分别为47.65、71.67和29.17g/hm2；春蓼Polygonum persicaria和苘麻Abutilon theophrasti敏感，ED90值分别为96.91、114.20g/hm2；而番茄不敏感。