HPLC法测定辣椒及其制品中苏丹红色素含量

[目的] 建立辣椒及其制品中4种苏丹红(sudan)色素的高效液相色谱同时测定方法.[方法] 采用反相高效液相色谱法,以乙腈-酸性水溶液为流动相,采用梯度洗脱,以二极管阵列检测器(PDA)定性定量测定辣椒制品中的4种苏丹红色素,并以LC-MS对阳性样品中的苏丹红成分进行了结构确证.[结果] 在添加浓度1～4mg/kg范围内,4种苏丹红色素的回收率在 81.92%～97.87 %之间,相对标准偏差(RSD)≤5.23%,最低检出限(信噪比S/N=3)分别为0.102、0.097、0.074、0.099mg/kg.[结论] 本方法经实际应用证明,具有良好的稳定性和重现性,步骤简单、可操作性强.     

住房抵押贷款提前偿付率的宏观影响因素分析

本文从宏观视角,运用多元线性回归模型和半参数模型等对我国个人住房抵押贷款组合提前偿付率的影响因素及其作用机制进行了实证研究。研究发现货币市场中长期贷款利率的提高,会增加借款人再融资成本,从而降低提前偿付率;资本市场作为借款人的收入来源之一与提前偿付率之间存在正相关关系;家庭人均净收入与提前偿付率的关系是非线性的;此外,与国外研究一致,房价和累计提前偿付额也会影响提前偿付率。     

乌克兰危机与中国的选择

乌克兰危机的爆发,有极其复杂的国内因素的原因。同时,它更是以美国为首的西方和俄罗斯在地缘政治上博弈的结果。乌克兰危机对国际形势的影响虽然不如舆论界预期那么大,但它可能会影响美国＂重返亚太＂战略的部署和进度。中国应当冷静观察,沉着应对。在始终坚持＂以经济建设为中心＂的基础上,坚定既有原则立场,强调尊重独立国家的主权和领土完整,坚决反对干涉内政,同时也要积极有所作为,为政治解决乌克兰危机,发挥独特的大国作用。     

居民个人理财工具持有状况分析及理财规划——以镇江为例

随着中国市场经济体制的确立和发展,特别是金融业的发展,居民个人理财工具越来越多,且仍呈发展趋势。本文对理财工具进行了对比,重点将各理财工具的优缺点进行比较分析,并就镇江市居民理财工具持有现状通过调查问卷进行调查研究,最终,对单薪家庭、老年人、中年人和营业主、未婚青年等提出理财规划建议。     

Do dividend initiations signal a reduction in risk? Evidence from the option market

We investigate whether dividends convey information about the risk of a company by examining the reaction of implied volatility in the option market to the announcement of a dividend initiation. Implied volatility decreases after the announcement and the magnitude of the decline in volatility is positively related to both the magnitude of cumulative abnormal returns (CAR) in the equity markets and the size of the dividend. Additionally, firms with weaker (stronger) corporate governance experience larger (smaller) declines in implied volatility. Cross sectional analysis shows that a one-standard deviation decline in measures of risk increases the 2-day CAR by 74–137 basis points. Our results suggest that dividend initiations signal declining firm risk.     

Demarketing as a differentiation strategy

Demarketing discourages consumers from buying. This paper shows that demarketing can be a profitable alternative when differentiation through product improvements is not cost effective. The impact of differentiating demarketing on profit, market share, consumers, and total welfare is investigated.This research began while Hess was visiting MIT's Sloan School of Management and was finished while visiting University of Haifa; he thanks both for their support.     

社会事业家理论评析

1980年代末以来,关注民间组织卓越领导人的社会事业家理论开始建构.领袖-特质理论认为社会事业家是以其对社会使命的不懈追求和强烈的伦理整合性来促成社会价值的最大化.建构主义理论认为社会事业家嵌入特定的组织结构和规则当中,并致力于创造新的制度或改造既有制度.社会事业家有四种理想形态:传统的创业型社会事业家、传统的拓展型社会事业家、自给创业型社会事业家和自给拓展型社会事业家.我国应从理念到制度层面培育社会事业家.     

Does telic/paratelic user mode matter on the effectiveness of interactive internet advertising? A reversal theory perspective

Drawing on reversal theory (Apter, 2007), the current research proposes that internet users' metamotivational state (telic vs. paratelic) determines advertising interactivity's effectiveness. An online field experiment involving 141 Facebook and Twitter users tests this proposition. Research findings support telic state consumers form more positive attitudes toward a low-level interactive ad, whereas paratelic state consumers form more positive attitudes toward a high-level interactive ad. Further, this research shows that an arousal seeking tendency mediates the metamotivational state's impact on ad attitude.     

A logistic regression point of view toward loss given default distribution estimation

We propose a new procedure to estimate the loss given default (LGD) distribution. Owing to the complicated shape of the LGD distribution, using a smooth density function as a driver to estimate it may result in a decline in model fit. To overcome this problem, we first apply the logistic regression to estimate the LGD cumulative distribution function. Then, we convert the result into the LGD distribution estimate. To implement the newly proposed estimation procedure, we collect a sample of 5269 defaulted debts from Moody’s Default and Recovery Database. A performance study is performed using 2000 pairs of in-sample and out-of-sample data-sets with different sizes that are randomly selected from the entire sample. Our results show that the newly proposed procedure has better and more robust performance than its alternatives, in the sense of yielding more accurate in-sample and out-of-sample LGD distribution estimates. Thus, it is useful for studying the LGD distribution.     

Following brands on Twitter: an extension of theory of planned behavior

Due to its immediacy and efficiency, Twitter has recently emerged as a form of marketing communication tool that offers unique advantages for two-way communication between marketers and consumers. This study examines brand-following behavior on Twitter using the Ajzen's model of theory of planned behavior (TPB). Results show that attitude toward brand following, subjective norm, perceived behavioral control, and brand attachment are positively associated with intention to follow brands on Twitter. Consumers’ intention to create (i.e., intention to tweet at brands) and disseminate (i.e., intention to retweet the links of brands) brand-related information, as well as purchase intention, are the outcomes of intention to follow brands on Twitter. Overall findings suggest that TPB model can be used to predict Twitter users’ brand-following behavior. More importantly, our finding that brand attachment drives consumer intention to follow brands on Twitter extends the TPB framework. This study provides both theoretical and managerial implications.