有效

基本解释 (translations)

effectivity  ·  hold  ·  validness

词组短语

be available for · be good for · hold true · in effect

与有效相关的网络例句 [注：此内容来源于网络，仅供参考]

Properties of efficient portfolios and the efficient frontier to the model are systematically analyzed. Our main results concerning the properties are: every efficient portfolio can be solved by minimizing portfolio risk under a given level of portfolio return or by maximizing portfolio return under a given level of portfolio risk; on the efficient frontier, the risk is a convex and strictly increasing function of the return and the return is a concave and strictly increasing function of the risk; the utility function on the efficient frontier can be expressed as a quasi-concave function of the risk or the return if the investor's utility function is quasi-concave.

从理论上系统地对该模型下的有效投资组合和有效前沿的性质进行了分析，结果表明：每一个有效投资组合可通过在给定期望收益水平的条件下最小化投资组合风险来获得，或者在给定风险水平的条件下最大化期望投资组合收益来获得；在有效前沿上，风险是收益的严格单调递增凸函数，收益是风险的严格单调递增凹函数；当投资者的效用函数是拟凹函数时，则有效前沿上的效用可表达成风险或收益的拟凹函数。

This thesis mainly discuss following issues, Theory and simple expressions for array covariance matrixes are derived when angular spread functions are symmetric distribution functions, i. e. the Uniform distribution, the Gauss distribution, the Laplace distribution and the Von Mises distribution, and a non-symmetric distribution function, i. e. the Gamma distribution. And the relation between the effective signal subspace and the array number, or and the nominal angle of the distributed source, the angular spread, the distributed functions, and the Signal-to-Noise Ratio is gained. The dimension of the effective signal subspace increases with increment of the array number. And it is more obvious to the non-symmetric distribution. The dimension of the effective signal subspace decreases with increment of the nominal angle. And the distributed source is equal to a point source as θ=π/2. The dimension of the effective signal subspace increases with increment of the angular spread.

本论文针对阵列信号处理中广泛存在的分布源现象，主要讨论了以下问题：推导了角度分布函数分别为对称的均匀分布、高斯分布、拉普拉斯分布、Von Mises分布和非对称的伽马分布时，分布源阵列接收信号协方差阵的严格模型和简化模型，得到了单个分布源的有效信号子空间随阵元数、分布源中心角、分布角、角度分布函数和信噪比的变化规律：随着阵元数的增加，对所有角度分布函数的有效信号子空间维数也随着增加，且非对称分布函数的有效信号子空间充满整个空间的可能性更大；随着分布源中心角逐步增加，有效信号子空间维数逐步减小，当θ=π/2时，等价于点源情形；随着分布源分布角逐渐加大，有效信号子空间维数也随之增加，直到有效信号子空间充满整个空间；随着信噪比的增加，有效信号子空间维数有一定程度的减少。

The results of optimization growth model with land input based on the RCK Model implied that when the economy convergences to one point in a saddle-shaped path, at this point the capital per capita and the consumption per capita will be unchanged, and higher efficient land input per capita will bring higher capital per capita and higher consumption per capita at that point.

在最优增长模型中，我们以RCK模型为框架，分析了当经济以鞍形路径收敛到某点时，该点的有效人均资本和有效人均消费水平，发现有效土地资本投入的增加使得经济收敛到一个具有更高有效人均资本水平和有效人均消费水平的收敛点。

At the same time, we can upbuild the improved schemes for DMUs from inefficiency to efficiency and from fuzzy efficiency to efficiency in view of the decision-maker's preconception, which can supply decision-makers with useful information and is the foundation for farther controlling and managing.

也能在系统评价时考虑决策者的个人偏好，给出决策单元从区间DEA非有效到区间DEA模糊有效或从区间DEA非有效到区间DEA有效的改进方案，为决策者提供有用的管理信息，为进一步有效管理和控制决策单元提供科学的依据。

At the same time, we can upbuild the improved schemes for DMUs from inefficiency to efficiency and from fuzzy efficiency to efficiency in view of the decision-maker 's preconception, which can supply decision-maker s with useful information and is the foundation for farther controlling and managing.

也能在系统评价时考虑决策者的个人偏好，给出决策单元从区间DEA非有效到区间DEA模糊有效或从区间DEA非有效到区间DEA有效的改进方案，为决策者提供有用的管理信息，为进一步有效管理和控制决策单元提供科学的依据。

Based on the facts of low soil fertility and unbalanced nutrient ratio in Ankou valley ,one soil sample was collected per 2 to 3 hm 2 according to the land use pattern and the relief determinant .

针对安口流域内土壤肥力水平低且养分比例失调的实际状况，按土地利用方式及地形部位每 2～ 3hm2 面积采集一个土壤样品，用常规分析方法测定了土壤有机质、有效氮、有效磷、有效钾、有效铜、有效锌等养分指标，编制了土壤养分丰缺对照表，对各测定项目进行了系统评价，并作了相应的推荐施肥建

In the horizontal direction,most of effective root for Black Locustdistributed in 30cm～90cm from stem basal,but it for Arborvitae distributed in 0～30cm.

其中，刺槐有效根长占总有效根长的51.58％，侧柏占58.38％；刺槐有效根干重占总有效根于重的63.01％，侧柏占71.09％；在水平方向上，刺槐有效根系密度呈二次抛物线型分布；侧柏则随距主干距离的增大而减小。

Total N increased significantly in the rhizosphere, hut total P and total K decreased. However, the available N, P and K in the rhizosphere behaved in an opposite way: with available N decreased but available P and available K increased in the rhizosphere except fur Phragmites communis Trin. Deficit of available N is the most significant, and accumulation of available P and available K were the least for Salsola nitraria Pall. among all seven halophytes.

在所有研究植物中，根际土壤中全N含量比土体的含量高，但全P和全K含量却比土体的含量低；根际土壤中有效态养分的变化则与全态相反，根际土壤中的有效N含量比土体中的都显著降低，除芦苇外，其他六种盐生植物根际土壤中有效P和有效K的含量都高于土体，但有效P的富集不及有效K富集的程度高。

Author was menstruated content of boron and researched the status of lack of Boron and researched relativity of its Influencing facto, the results showed that the average content of available boron in the yellow soil was 0.39±0.27 mg/kg, 80 percent of its was under 0.5mg/kg which was lack for boron and 17.44 percent of its was under 0.2mg/kg which was especially lack for boron; The distribute frequencies of available boron contents of yellow soils in Chongqing was dispersedly, its range of 0.07mg/kg to 1.99mg/kg. The diversity of different zoology area was distinct. The result of pertinence analyses showed that available boron contents had correlativity with the pH(r=0.181** n=281) and CEC（r=0.124** n=281 and It had correlativity with Organic matte When the content of organic matte is high; in addition, soil granule、clime was the Influencing factor of availability of boron in Yellow Soils in Chongqing.

笔者通过调查取样对重庆市黄壤硼的含量进行测定并分析了缺硼的程度，对其影响因素进行了相关性分析，研究结果表明：重庆市黄壤有效硼的平均含量为0.39±0.27mg/kg，其中近80%的土壤样品有效硼含量低于0.5mg/kg，属于低硼或缺硼土壤，还有17.44%的土壤样品有效硼含量低于0.2mg/kg，属于极度缺硼的土壤；而有效硼含量的分布频率比较分散，变幅较大，从0.07mg/kg~1.99mg/kg，变异系数达到69.41%，不同生态类型区土壤有效硼含量的差异十分明显；而相关性分析结果表明：土壤有效硼与土壤pH值(r=0.181** n=281)和CEC（r=0.124** n=281呈正相关，在有机质含量较高的条件下与其相关性也较为显著（r=0.347** n=90，而土壤质地以及气候也对重庆市黄壤硼的有效性有很大的影响

The reservoir rock types in the region of interest are grain limestone, algal limestone, cryptite, siltstone, muddy limestone and mudstone. The thesis identified as a result of changes in the deposition causing the heterogeneity in plane, and then the geological oil reserves have been calculated in accordance with the areal heterogeneity.3、Based on the data of core analysis, bore logging, array induction imaging log and FMI, porosity and permeability model were built using regression analysis. Through testing 45 rock samples, a, b, m, n value were obtained and used to calculate single-layer oil saturation value using the Archie formula. According to the theory of laterolog and inductolog, resistivity ratio and cross plot were used to identification effective thickness. Effective thickness was identified delicately in 103 wells. Based on the over work, active porosity and oil saturation was calculated accurately.4、According to observation of 100 pieces of the thin slices, cast thin slices and 383m core in three wells, the chief diagenesis in this area were compaction, cementation, denudation and cataclasis. Cementation and denudation were universally influenced active porosity this area. The intergranular pores, residual pores and secondary pores were formed in thin carbonated reservoir of lacustrine facies.5、The influence of reservoir heterogeneity to reservoir calculation was analyzed systematically using actual data. And the conclusions were as follows:①The principal reason leading to oil distribution unequal is interior structural feature of reservoir in structural hydrocarbon reservoir.

确定了由于沉积微相的变化而导致的平面非均质性，进而在平面上按照平面非均质单元计算了石油地质储量。3、利用岩心分析、常规测井曲线与阵列感应、成像测井资料相结合，分岩性利用回归分析方法建立了储层孔隙度、渗透率模型；通过对45块岩样进行岩电试验，获取了a、b、m、n值，利用阿尔奇公式计算了各单层含油饱和度值；根据侧向电阻率和感应电阻率串并联特性，利用电阻率比值法与常规交会图法相结合重建了有效厚度图版，对全区103口井目的层段进行了有效厚度精细划分，通过以上工作，准确求取了储量计算单元内有效厚度参数、有效孔隙度参数以及含油饱和度参数。4、通过对研究区3口井383m岩心观察，100余块薄片、铸体薄片镜下鉴定得出：油泉子油田上、下油砂山组储层主要成岩作用是压实作用、胶结作用、溶蚀作用和破裂作用，其中溶蚀作用、胶结作用最普遍，这两种作用对有效孔隙度影响最大，以上成岩作用形成了原生粒间孔、粒间残余孔和次生孔隙(如粒间溶孔、粒内溶孔、铸模孔、晶间孔等)为主的薄层湖相碳酸盐岩储层。5、利用实际资料，系统分析了油藏非均质对储量计算的影响，认为：①对于构造油气藏而言，油气藏构造及断裂特征是造成油气分布不均的首要原因，储集条件相同的条件下，构造高部位有利于储存油气，油气在垂向的重力分异体现了油气藏内部构造的不均一特征。

与有效相关的网络解释 [注：此内容来源于网络，仅供参考]

actual life：实际寿命,有效有效

Actual focal spot 实际有效焦点 | Actual life 实际寿命,有效有效 | Actual size 实际尺寸,实际大小.

effective aperture：有效口径;有效孔径

有效重力加速度 effective acceleration of gravity | 有效口径;有效孔径 effective aperture | 有效面积 effective area

payload capability：有效载荷能力/有效负载能力

Pavement Life 路面寿命 | payload capability 有效载荷能力/有效负载能力 | payload mass 有效负载质量

label.effectiveDateFrom","Effective Date From：有效日期从 ","有效日期从

"label.effectiveDate","Effective Date","生效日期 ","有效... | "label.effectiveDateFrom","Effective Date From","有效日期从 ","有效日期从 " | "label.effectiveDateTo","Effective Date To","有效日期 "

available nutrient：有效养分 有效養分

available nitrogen 有效氮 有效(性)氮 Y | available nutrient 有效养分 有效養分 Y | available phosphorate 有效磷 有效(性)磷 Y

Effective permeability：有效磁导率,有效渗透性

effective magnetic moment 有效磁距 | effective permeability 有效磁导率,有效渗透性 | effective power 有效功率

Effective permeability：有效磁导率 有效渗透率 相对渗透率

Effective magnetic permeability 有效磁导率 | Effective permeability 有效磁导率 有效渗透率 相对渗透率 | Effective reflection surface of flaw 缺陷有效反射面

available phosphorate：有效磷 有效(性)磷

available nutrient 有效养分 有效養分 Y | available phosphorate 有效磷 有效(性)磷 Y | available water 有效水 可利用水 Y

volts：电压真有效值和基波真有效值

Volts 电压真有效值和基波真有效值 | Amps 电流真有效值和基波真有效值 | Watts 有功功率和基波功率

effective downwash：有效下洗流;有效下向氣流

effective disc area 有效盤形面積 | effective downwash 有效下洗流;有效下向氣流 | effective exhaust velocity 有效排氣速度