主成分分析在企业发展评估的应用

在某国有银行财务报表中选取10个主要指标进行主成分分析,利用SPSS20软件求解出第一主成分和第二主成分的主成分得分和综合得分,并根据综合得分进行了排名。最后,总结出平均总资产回报率、风险加权资产收益率、不良贷款率、拨备覆盖率、一级资本充足率和总权益对总资产比率这6个指标的变化会对该企业的发展产生显著的影响。     

基于FPGA的脉冲参数测量系统

该系统是基于FPGA和单片机AT89S52的脉冲参数测试系统,能够测量脉冲信号的周期、频率、占空比、脉宽等参数。首 先由FPGA提供一个频率为50 MHz的信号源作为标准信号源,并在FPGA中构造2个32位的计数器,用来测量被测信号的各 个参数,最后将测量结果送入单片机中处理并显示。整个系统主要由按键电路、门控电路、2个32位计数器和显示电路等模块 组成。通过测试该系统抗干扰能力强,测量数据稳定可靠,测量精度高。     

非智力因素的培养对提升大学生就业能力的研究

自高校统招以来,高校毕业生就业能力不足所导致的就业难已经成为全社会普遍关注的问题。因此,要改善毕业生的就业难现状,不仅要重视经济结构的调整,加快发展服务业的吸纳能力,更要强化毕业生的就业能力培养。     

基于改进Sobel算法的焊缝X射线图像气孔识别方法

提出一种具有自适应能力的焊缝X射线图像气孔检测方法.通过局部动态阈值分割法设计了多方向的焊缝X射线图像模板,采用Sobel算法对复杂背景下的焊缝进行边缘检测和区域标记,并在标记区域对原始图像x和y方向的灰度梯度进行分析,以增强小气孔和粘连气孔的识别能力.检测应用效果表明,所提出的方法具有良好的自适应能力且准确快速,能够有效地克服人工评片中产生的漏判与误判等缺点,并且能够存储和查询检测数据.     

Synthesis, Crystal Structure, Fluorescent and Thermal Properties of Sodium Tridecafluorodizirconate Na5Zr2F13 Compound

1 INTRODUCTION Considerable research effort on the heavy metal fluoride glasses like barium, zirconium fluoride and a series of rare-earth fluorozirconate compounds du- ring the last two decades was initiated by the broad optical transmission window of these glasses and thereby the potential for ultralow-loss optical fi- bers[1~10]. The fluorozirconate of alkali metals was first reported in 1938[11], and most of the sodium and potassium fluorozirconates were reported amongthe 1940s and 19…     

Synthesis and Crystal Structure of a New Zn(II) Nitronyl Nitroxide Complex [Zn(NIT4Py)(PDA)(H2O)3]

1 INTRODUCTION Nitronyl nitroxides, independently or in combina- tion with metal ions, have been one of the most wi- dely studied systems in molecular magnetism for understanding radical-radical or metal-radical inte- ractions as well as for synthesizing organic ferroma- gnets and metal-radical magnetic materials[1～4]. Up to now, lots of metal-radical complexes have been reported[5～8]. On the other hand, cooperative inter- molecular interactions, such as coordination bonds, hydrogen bon…     

Correlation Study on Sweetness of Amino Acid with Different Configurations and Quantum Chemical Parameters

1 INTRODUCTION Since the introduction of QSAR by Hansch and Fujita in 1964, Deutsch and Hansch have quickly used it in the study of nitrophenylamine sweet reagents. They found good correlation between their distribution coefficients in octanol/water system and sweetness degree. Subsequently, they detected that vibration of aroma-substituent compounds has so- mething to do with sweetness. Henceforth, statistic correlations between structure and sweetness ofseries compounds have been inv…     

Crystallization and Preliminary Crystallographic Studies of Luffaculin 1, a Ribosome-inactivating Protein from the Seeds of Luffa Acutangula

1 INTRODUCTION The ribosome-inactivating proteins (RIPs) are RNA N-glycosidases[1, 2] which inactivate ribosomes by cleaving a single N–C glycosidic bond between adenine and ribose at A4324 in the 28s rRNA of rat. Because of the removal of one adenine from rRNA, elongation factorⅡ(EF-2) can not bind to the 60S subunit, so RIPs can arrest protein synthesis. RIPs can be classified into three types based on the struc- tures of genes and mature proteins[3]. Type 1 RIPs with molec…     

Studies on the Reaction Mechanism of Br2 ＋ I2 = 2IBr

1 INTRODUCTION Interhalogen compounds have played an impor- tant role in environment and chemical engineering production. During the course of ozone exhaustion induced by sunlight in polar region, Br2, BrCl and HOBr are all precursors of Br atom[1]. Lately, scien- tists have detected that the content of BrCl in polar region sunlight was 35 ppt, larger than that of Br2 (25 ppt). Previous studies suggested that the con- centration of BrCl and O3 exhibits obvious negative correlation: w…     

Synthesis and Crystal Structural Characterization of a Thiosemicarbazone Derived from 4-Acylpyrazolone

1 INTRODUCTION Pyrazol-5-one derivatives form an important class of organic compounds due to their structural che- mistry and biological activities as analgesic, antipy- retic, anti-inflammatory and hyperglycemic agents[1～4]. Even the simplest pyrazol-5-one derivatives like antipyrine and amidopyrine are widely used in anal- gesic medicine[5, 6]. On the other hand, thiosemicar- bazones, especially heterocyclic thiosemicarbazones, have been the subject of extensive investigations be- cause…