企业效益影响因素和获利能力的分析评价方法研究

阐述了影响企业效益因素重要程度的 D 值分析法.对企业获利能力建立了多元线性回归分析模型,尝试性地作了评价方法的阐述.     

Role of Nd-Ni on structural,spectral and dielectric properties of strontium-barium based nano-sized X-type ferrites

The influence of neodymium and nickel substitution on structural and dielectric parameters was investigated in strontium-barium X-type hexagonal ferrites having composition SrBaCu_2?xNi_xNd_yFe_28?yO₄₆ (x = 0, 0.2, 0.4, 0.6, 0.8, 1 and y = 0, 0.02, 0.04, 0.06, 0.08, 0.1). Sol-gel method was employed for synthesizing these hexagonal ferrites. The XRD plots of all studied materials which were annealed at 1250 °C show single phase characteristics. Lattice parameter ‘c’ increased as a consequence of larger radius of rare earth ion (Nd³⁺) as compared to (Fe³⁺), while lattice parameter ‘a’ showed very small variation. The cell volume was obtained in the range 2508.32–2523.75 (ų). The inclusion of Nd-Ni also affected X-ray density, bulk density and porosity. The FTIR spectroscopy indicated the particular absorption peaks of hexagonal ferrites and it was performed in the range of 500–700 cm^?1. On account of Nd-Ni doping, the dielectric constant, dielectric loss and AC-conductivity showed decreasing trend. The occupancy of Nd³⁺ ions at octahedral site impedes the valence alternation of Fe³⁺; therefore there was decrease in dielectric permittivity. Ac conductivity has been decreased from 9.14 to 6.49 (Ω cm)^?1 at frequency of 2.7 GHz. The Cole-Cole plots of synthesized materials noticeably revealed grain boundary contribution. The appearance of single semi-circle in impedance Cole-Cole graphs confirms the exceptional role of grain boundaries in the conduction process. The considerably lower dielectric parameters of investigated nano X-type ferrites propose their feasibility for high-frequency applications (phase shifters, dielectric resonators, stealth technology etc).     

Estimation of Thermodynamic Properties of Polysaccharides

Polysaccharides are the most important components of herbal biomass with a high application potential. Their thermochemical characteristics, however, have been little studied. In the present paper, an effective thermodynamic analysis was carried out with the aim of setting a method for reasonably estimating the thermochemical properties of polysaccharides such as cellulose. The properties of formation and heat capacities were estimated by general thermodynamic methods like group contribution methods as well as methods followed from synthetic polymer studies. The results were compared with those obtained by empirical correlations derived from the data for short chain carbohydrates, the only literature data available for validation. The properties were determined depending on the degree of polymerization and temperature.     

The influence of temperature on stacking fault energy in Fe-based alloys

Temperature has great influence on the stacking fault energy (SFE). Both SFE and dr0/ d T for Fe-based alloys containing substitutional or interstitial atoms increase with increasing tempera-ture. Based on the thermodynamic model of SFE, the equation dr0/dT=drcn/dT+drseg/dT+drMG/dT and thoseexpressions for three items involved are established. The calculated dr0/dT is generally consistent with the experimental. The influence of chemical free energy on the temperature dependence of SFE is almost constant, and is obviously stronger than that of magnetic and segregation contributions. The magnetic transition and the segregation of alloying elements at stacking faults cause a decrease in SFE of the alloys when temperature increases; that is, drMG/dT<0 and dyseg/dT<0. Meanwhile, such an influence decreases with increasing temperature, except for the drseg/d 7 of Fe-Mn-Si alloys. With these results, the experimenal phenomena that the SFE of Fe-based alloys is not zero at the thermo-dynamically equilibrated tem     

生物降解混源油混合比例估算方法

研究生物降解混源油的混合比例时的关键是根据研究对象的降解程度，选择既能抗该降解程度又能有效区分烃源岩贡献的生物标志化合物，作为估算原油生物降解前的混合比例的参数，并通过配比实验检验估算结果的可靠程度。在研究渤海PL19—3油田生物降解混源油的混合比例时，选用源自沙河街组三段和东营组下段烃源岩的典型油样，以三芳甾烷／三芳甲藻甾烷作为参数，用估算法计算了PL19—3—4井(最靠近渤中凹陷)生物降解原油混合比例，东营组下段烃源岩的贡献约占30％，该井以南的PLl9—3—2井、PL19—3-8井和PL19—3—5井东营组下段烃源岩的贡献逐步下降，最低约占10％。图4表3参15     

Partially linear model for harmonic contribution determination

Harmonic contribution determination is the premise on which the improvement of power system harmonic management is based. Calculating the harmonic impedance accurately is the key issue in harmonic contribution determination. The fluctuation method is a mature method for calculating the harmonic impedance in engineering applications. However, this method is ineffective when the background harmonic fluctuation is dominant. To make up the deficiency of the fluctuation method, the partial linear regression model for the harmonic impedance calculation is proposed in this paper, and then a two‐stage method is derived for the unbiased estimation of the model. The method proposed in the paper can calculate the harmonic impedance whether or not the background harmonic fluctuation is dominant, and then the harmonic contribution can be determined. The effectiveness of the proposed method is verified by the IEEE14‐bus system simulation and field test. © 2016 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.     

一种基于KNMF的非线性故障诊断方法

将核非负矩阵分解方法引入到过程监控中,设计了K2和SPE统计量反映原始数据的能量波动情况,进而检测过程故障的发生。同时提出一种KNMF贡献图计算方法,根据变量和非线性数据的相关性,计算变量贡献值并绘制贡献图,用于故障辨识。在TE模型上的仿真结果验证了KNMF故障检测的良好性能,利用KNMF贡献图可以较好地辨识故障变量。     

泸州老窖对中国白酒发展的贡献

据考证,泸州老窖今天工艺的雏形始于宋代,泸州老窖拥有我国“老窖”最多,“窖龄”最老的老窖池群,泸州老窖酒以其“醇香浓郁,清冽甘爽,回味悠长,饮后尤香”的风格,驰名中外,成为珍贵的民族遗产,被誉为酒中泰斗,浓香型鼻祖,为了提高中国白酒质量,泸州老窖人将其研究所得科技成果向全国传播、推广,培训酿酒技术人才,为中国白酒香型的发展和质量的提高作不可磨灭的贡献。     

知乎网用户贡献影响因素实证分析

兼具社交性与媒体性的问答型网站知乎网,在近两年内迅速崛起并形成了强大的社会影响力,其核心要素在于成功地激励了知乎网用户进行内容贡献。本文基于TRA、TPB、社会资本理论等学说,以知乎网的实际运行生态为背景进行实证观察,具体分析共同愿景、存在感、知识共享意愿等激励知乎网用户贡献的构成要素。知乎社区中,"用户"的主要角色由信息接收终端转变为信息的生产者或信息的传播枢纽;极少数的意见领袖在生产内容、传播信息方面发挥着不可小觑的影响力。把握18~35岁的主体用户的需求,处理好大V用户和草根用户之间、用户数量和用户质量之间的矛盾,有助于激励知乎网用户进行持续性贡献。