低

An optimal filter is designed specially for dq transform used in the voltage mea-surement of transfer switch,which is composed of lower-order notch filter and lower-order low pass filter with higher cut-off frequency in series.Its transfer function is presented by theoretical derivation.If the order is same,it is better in measuring the positive sequence of fundamental amplitude than the average filter and the low-pass filter.

针对转换开关电压检测法——dq变换设计了优化滤波器，该滤波器是利用低阶陷波滤波器和较高截止频率低阶低通滤波器串联形成的，通过理论推导给出了该滤波器的传递函数，在相同的滤波阶数下，该优化数字滤波器在提取基波正序幅值的性能比较中，优于平均值滤波法及低通数字滤波器法等。

Results (1) Compared with that of 4-Retro-decoction group and heart failure control group, the activity of Na〓-K〓-ATPase in low- and middle- dosage ginger group showed to be decreased with statistically significant difference. P＜0.05.(2) The activity of Ca〓-ATPase and Mg〓-ATPase in the lower- and middle-dosage ginger group were not statistically different from that of 4-Retro-decoction group and control group, but the activity of Ca〓-ATPase showed an ascending tendency in low-dosage ginger group.

结果 (1)低、中剂量干姜组的Na〓-K〓ATP酶活性明显偏低，与四逆汤组和心衰组比较，差别均具有显著性，P＜0.05；(2)低、中剂量干姜组的Ca〓-ATP酶和Mg〓-ATP酶活性与四逆汤组和心衰对照组比较，无统计学意义，但低剂量干姜组的Ca〓-ATP酶与其它三组相比有升高趋势。

Since 1999, low-fat, low-cholesterol products containing at least 6.25 grams of soy protein per serving – equal to about a half-cup of tofu or a cup of soy milk – can carry a label that says:"Diets low in saturated fat and cholesterol that include 25 grams of soy protein a day may reduce the risk of heart disease."

自1999年以来，任何低脂肪、低胆固醇产品，只要含有每餐至少6.25克大豆蛋白（相当于半杯豆腐或一杯豆浆），就可以在标识中带有以下字样："本产品饱和酸含量低，胆固醇含量低，含有每天所需的25克大豆蛋白，可以降低心脏病风险。"

First low order approximation of generating function and approximate optimal trajectory were obtained. Then using low order approximation of generating function of Hamilton "relative motion" to the approximate optimal trajectory, improvement of the approximate optimal trajectory was iteratively made. In this way, high order approximation accuracy can be obtained by only using low order approximation, which is much cost effective in computing.

首先以较低的计算代价，获得最优控制Hamilton系统生成函数的低阶近似，得到一条近似的最优轨线，然后将最优控制Hamilton系统相对于近似最优轨线求"相对运动"，该"相对运动"仍具有Hamilton性质，利用这一"相对运动"的生成函数低阶近似，可以对近似最优轨线进行迭代修正，从而以计算代价较小的低阶近似逼近计算代价高得多的高阶近似的精度。

Finally, by studying on using saw blades with different matrices cutting different stones, a basic compatibility rule about matrices and stones was concluded, say, when cutting a hard, high quartz and high alkalifeldspar content and strong bonded stone, a high impact strength and low wear-resistance matrix should be chosen; otherwise, when cutting a soft, low quartz or no quartz content and weak bonded stone, a high bending strength, low impact strength and high wear-resistance matrix should be chosen.

最后，通过对不同性能结合剂的锯片切割不同石材的切削寿命和磨损状态分析，得出了锯片结合剂性能与岩石性质之间的一般性匹配原则：即对于坚硬的、高石英含量的花岗岩，宜选用高强度、高冲击韧性、低耐磨性和对金刚石具有良好粘结性能的结合剂；对于低硬度、无石英或低石英含量的易切削花岗岩，宜选用高强度、高耐磨性和低冲击韧性的结合剂。

Numerical simulation of temperature field of soil around the horizontal ground pipe;2. The paper presents a new technique of producing methane with solar heating in cold area,develops the experiment system for producing methane with solar heating,studies the heat-transfer content、temperature difference of heat interchanger and temperature field of soil around the digester fermenting,gives the value of heat .

为解决北方地区由于冬季气温、地温低，沼气生产存在产气率低、使用率低、原料分解率低、沼气使用综合效益差等问题，文章介绍了一种利用太阳能加热制取沼气的方法，建立了太阳能加热制取沼气的试验系统，研究了换热器的加热量、进出口温差以及沼气池周围土壤温度场的变化情况，并给出了换热器的传热系数。

The paper presents a new technique of producing methane with solar heating in cold area,develops the experiment system for producing methane with solar heating,studies the heat-transfer content、temperature difference of heat interchanger and temperature field of soil around the digester fermenting,gives the value of heat .

为解决北方地区由于冬季气温、地温低，沼气生产存在产气率低、使用率低、原料分解率低、沼气使用综合效益差等问题，文章介绍了一种利用太阳能加热制取沼气的方法，建立了太阳能加热制取沼气的试验系统，研究了换热器的加热量、进出口温差以及沼气池周围土壤温度场的变化情况，并给出了换热器的传热系数。

Fig.4. Effects of acute hypoxia again on KV current in chronic intermittent hypoxic rat PASMCs.

急性缺氧对慢性间歇性低氧大鼠PASMCs KV电流仍有抑制作用(图4 A ，慢性间歇性低氧的细胞来自低氧25 d的大鼠)，而且这种抑制作用随着慢性间歇性低氧时间的延长而逐渐减弱(图4 C )。

Combined analysis of sedimentary environment,diagenesis and tectonic evolution has been applied to obtain the origin characteristics of low resistivity contrast pay.

通过建立低阻油层各种岩石物理成因与地质成因之间的关系，结合沉积环境、成岩作用、构造特征和成藏动力因素等综合分析低阻油层的发育特征，提出了5种具有典型意义的低阻油层有利勘探目标区带：（1）小规模、低幅度构造发育区，（2）天然水淹等构造运动活跃、流体非均质严重的区带，（3）岩性细、粘土矿物组合中蒙脱石含量高的区带，（4）弱水动力环境下砂泥岩薄互层发育区，（5）与火山碎屑沉积演化有关的黄铁矿等导电性矿物富集区。

For the increase rate of patent accept, the provinces showing significant "Low-Low" correlation mainly distributed in the northeast of China and the provinces of significant "High-High" correlation were mainly located at eastern China. For the increase rate of patent authorization, the provinces displaying significant "Low-Low" correlation mainly centered on southern China and the provinces of significant "High-High" correlation were mainly situated at western China and eastern China.

其中专利受理增长率"低-低"关联的省区主要集中分布于我国东北部区域，专利受理增长率"高-高"关联的省区则分布在我国东部地区；专利授权增长率"低-低"关联的省区主要分布于我国华南地区，而专利授权增长率"高-高"关联的省区则主要分布在我国西部地区和东部局部地区。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐