不同浓度秋水仙素处理对香蕉生理状况影响的研究

本试验主要探讨秋水仙素对香蕉组培苗的作用效应，所以本实验分别采用0．1％、0．2％、0．3％和O．4％浓度的秋水仙素对威廉斯组培苗单个茎尖进行不同时间（1、2、3、4、5d）的诱导处理，并对诱变处理后再生植株的生长情况和叶片过氧化物酶活性进行了检测。结果表明：0．2％浓度的秋水仙素处理的，香蕉叶片中的过氧化物酶表现是比较好的。     

非离子表面活性剂增敏催化动力学光度法测定痕量铁

研究了在硫酸介质中,以非离子表面活性剂吐温-80为增敏剂,Fe(III)催化过氧化氢氧化罗丹明B的褪色反应,以此建立了催化动力学光度法测定痕量铁。结果表明,Fe(III)的质量浓度在0~16μg/L范围内服从比尔定律,摩尔吸光系数为1.06×105 L.mol-.1cm-1。该法用于茶叶中痕量铁的分析,结果满意。     

包覆相脂解酶的特性研究

文章系利用硅酸(由tetramethoxysilane水解产生)及polyallylamine进行仿生氧化硅包覆脂解酶(from Pseudomonas cepacia),并以包覆后脂解酶催化大豆油或废食用油与甲醇进行转酯化反应。以反应曲面法和BoxBehnken实验设计探讨反应温度、受质莫耳比(methanol/oil)、含水量(w/w of oil)对生质柴油含量的影响。     

含铜类水滑石催化苯酚羟基化合成苯二酚

制备了一系列含铜类水滑石及含铜混合氧化物Cu-M-Al-O,考察了这些物质催化苯酚羟基化的性能。以铜铝水滑石为载体负载硝酸铋,经焙烧制备了Bi2O3/Cu-Al-O复合氧化物,考察了以Bi2O3/Cu-Al-O为催化剂催化苯酚羟基化的工艺条件。较佳工艺条件是:硝酸铋的负载量为Cu-AlHTLcs质量的3%,n(苯酚):n(过氧化氢)=1:1.5(mol/mol),溶剂水的用量为30mL/2g苯酚,催化剂的用量为苯酚质量的5%,反应温度为80℃,反应时间为90min。在上述条件下,苯酚的转化率可达86.8%,邻、对苯二酚的收率分别可达56.6%、18.4%。     

硅腈化反应的进展

简要的综述了近几年有关催化醛的硅腈化反应和催化酮的硅腈化反应的报道,包括金属络合物、小分子、环肽、非金属等作为催化剂在硅腈化反应中的应用。     

浅析煤焦油加氢饱和反应原理

烃类是加氢轻质化原料的主要成分,在催化加氢轻质化过程中,各种烃类物质的反应会直接影响到加氢产物油中物质的含量和分布.根据反应条件的不同,一般来说,烃类的加氢反应分可以分为两类:一类反应是加氢处理条件下不饱和烃的加氢饱和反应,这些反应与杂原子脱除反应同时进行,在加氢饱和反应过程中,碳原子数基本上不会发生变化.煤焦油中芳烃主要有烷基苯、烷基萘及蒽等,其典型的加氢反应如下:     

混凝土碱骨料反应浅析

<正>混凝土碱骨料反应是混凝土原材料中的水泥、外加剂、混合材和水中的碱(Na2O或K2O)与骨料中的活性成分发生的反应。混凝土碱骨料反应对建筑物的危害很大,此反应会在混凝土浇     

固定化过氧化物酶对生牛奶的保鲜研究

在常温下采集和运输鲜奶,因保鲜不好常会造成大量的鲜奶变质,而采用固定化过氧化氢酶保鲜技术对生牛奶保鲜,具有高效、安全、低耗、便用等特点,是一种值得推广的牛奶保鲜新方法。     

双协同催化动力学荧光法测定微量碘

文章基于Ag NPs和I~-对碳点(CDs)-过氧化氢(H_2O_2)氧化还原反应的双协同催化作用,使体系荧光猝灭,建立测定微量I~-的新方法。实验表明,在pH=6.6的磷酸二氢钾-氢氧化钠缓冲介质中,在35℃下反应10 min,体系达到稳定,线性范围为2.0~80.0×10~(-8)g/mL。用于食盐中I~-含量的测定,其回收率为98.1%~103.2%,RSD≤5.93%(n=6)。     

P-Phos-钯络合物催化吡啶硼酸的Suzuki偶联反应研究

将双齿膦配体P-Phos应用于钯催化的3-吡啶硼酸的Suzuki反应中,通过对溶剂和碱等反应条件的考察,确定了最佳的催化条件,并对一系列底物进行了普适性拓展。实验表明,该催化剂对大多数卤代芳烃底物起到了良好的催化效果,并且可以实现惰性底物氯代芳烃与吡啶硼酸的高效偶联,产率高达99%。     

B2C网站顾客忠诚度评价研究

文章基于B2C网站顾客忠诚度的驱动因素,构建了B2C网站顾客忠诚度的评价指标体系,利用层次分析法,结合调查问卷和专家评估构建模糊关系矩阵评估了B2C网站的顾客忠诚度,并以几家B2C网站为例,验证了该模型的实用性。     

纤痕量钒的催化光度法测定研究

在磷酸介质中,钒(V)强烈的催化溴酸钾氧化钙指示剂褪色的指示反应,研究了该催化反应的最佳实验条件,建立了测定钒的新方法。方法的测定范围是0～100pg/ml,检出限为2.36pg/ml。催化反应的表观活化能为44.91kJ/mol,表观速率常数为1.45×10-3 s-1。方法用于水样中痕量钒的测定,结果满意。     

环糊精衍生物对废水中几种金属离子处理的研究

环糊精作为一种环境友好材料近年来被广泛应用于水处理[1]、受污染土壤的治理和恢复[2],能够对有机污染物产生降解作用。对环糊精的结构修饰能够提高其溶解度,并且改变其空间结构,产生一些和环糊精本体不同的化学性质。各种金属造成的污染日趋严重,成为影响我国人民健康水平和社会经济发展的一个重要因素,研究新的环境友好材料消除金属的污染是当前的比较新颖的研究方向。本课题就是基于以上问题开展的研究工作。本实验采用经改性的β-环糊精,分析了其对Fe(Ⅱ)、Cu(Ⅱ)、Zn(Ⅱ)三种金属离子的去除效果[3,4],并研究了温度、反应时间、pH因素实验效果的影响。实验结果表明:β-环糊精的交联聚合物对Fe(Ⅱ)的去除率可以达到95.8%,对Cu(Ⅱ)的去除率为25.9%,对Zn(Ⅱ)的去除也有一定的效果。     

Antecedents and outcomes of acceptance of performance appraisal system in Korean non-profit organizations

This study identifies the antecedents of non-profit public service motivation (NPSM) and employee outcomes using Korean non-profit acceptance of performance appraisal system (APAS) survey data. We test an NPSM model and examine the concept through public service motivation (PSM) in the non-profit sector. We then apply findings on work motivation, PSM, and performance appraisal systems to quantitative research and test several hypotheses concerning how (1) the non-profit sector’s APAS affects and uniquely shapes non-profit workers’ motivation, (2) NPSM relates to organizational trust, and (3) organizational characteristics affect Korean non-profit employees. We discuss our findings’ implications for non-profit theory and practice.     

基于QR码应用的电子回单流程设计

有效的订单回单管理可以提高企业运作效率、加快企业资金周转。当前,很多企业都面临着订单回单返回慢、收不齐的问题,在已有二维条码技术的基础上,结合智能手机的特点,提出了基于QR码应用的电子回单流程设计,并作了成本分析和风险评价。     

Evaluating the impact of virtualization characteristics on SaaS adoption

Software as a service (SaaS) is a service model in which the applications are accessible from various client devices through internet. Several studies report possible factors driving the adoption of SaaS but none have considered the perception of the SaaS features and the organization’s context. We propose an integrated research model that combines the process virtualization theory (PVT), the technology-organization-environment (TOE) framework and the institutional theory (INT). PVT seeks to explain whether processes are suitable for migration into virtual environments via an information technology-based mechanism as SaaS. The TOE framework seeks to explain the effects of the intra-organizational factors, while INT seeks to explain the effects of the inter-organizational factors on the technology adoption. This research addresses a gap in the SaaS adoption literature by studying the internal perception of the technical features of SaaS and technology, organization, and environment perspectives. Additionally, the integration of PVT, the TOE framework, and INT contributes to the information system (IS) discipline, deepening the applicability and strengths of these theories.     

Market Reaction to Goodwill Impairments

This paper examines the information content of goodwill write-downs under International Accounting Standard (IAS) 36 (Impairment of Assets) and Statement of Financial Accounting Standards (SFAS) No. 142. We investigate whether the informational value depends on the reliability of the news. Using a sample of 564 goodwill write-down announcements issued from 2005 to 2009, we find a negative capital market reaction to announcements of unexpected goodwill write-offs. Our results indicate that investors react more negatively when a country's level of legal protection is low and allows more management discretion. We further report that market reaction is associated with managers explaining the write-down decision and depends on the verifiability of these explanations. Investors react more negatively when an unverifiable internal explanation is given and less negatively when a verifiable external explanation is provided. We do not find significant differences between write-down announcements under SFAS 142 and IAS 36.     

浅议企业环境会计制度的构建

我国目前对企业环境会计制度的研究尚处于起步阶段,尚未形成一套公认的、可以在实务中运用的环境会计制度。文章借鉴国外已有的研究成果,对环境会计制度的构建内容进行初步研究,并对在我国开展企业环境会计制度构建工作提出相关措施。     

Revisiting Oligopolistic Reaction: Are Decisions on Foreign Direct Investment Strategic Complements?

Knickerbocker (1973) introduced the notion of oligopolistic reaction to explain why firms follow rivals into foreign markets. We develop a model that incorporates central features of Knickerbocker's story—oligopoly, uncertainty, and risk aversion—to establish the conditions required to generate follow-the-leader behavior. We find that rival foreign investment will make risk-neutral firms less inclined to move abroad once its rivals have done so. We show that Knickerbocker's prediction relies on risk aversion and derive an expression for the minimum amount of risk aversion needed to generate oligopolistic reaction.