马克思主义与当代中国经济学

传统社会主义经济学的弊端已被人们充分认识和批判。但是,我们在对传统社会主义经济学进行清算的时候,理应给予马克思主义以应有的评价。实践在发展,马克思主义也在不断发展。马克思主义对当代中国经济学的走向依然在发挥着重大影响,这个影响是如此真实,以至于在当代中国经济学所关注的所有重大问题中,无论人们承认与否,马克思主义的“幽灵”都无处不在。实践证明,中国经济学的发展和构建必须以马克思主义为基础。     

时光·梦想

生活在19世纪的人们,乐于听到工业革命的轰鸣声。他们知道,这是“现代”的召唤。21世纪的我们,现代的我们则渴望着回到自然的怀抱。这是文明的又一道曲线。它从一个欣欣向荣滑到另一个欣欣向荣。而这两个时代都打上了进步的鲜明烙印,都同样是我们光荣的、关于自身、关于梦想的珍贵记忆。如果好奇于日常生活中的周遭事务,并执着于探求它们的来源,我们会惊奇地发现:时常光顾的超市、购物中心、度假村、俱乐部,始于世界博览会;电视机、留声机、电灯,在世博会上首次展出;甚至第一台纺织机、第一架飞机竟也是从世博会步入我们的生活。“一切始于…     

A primal dual active set with continuation algorithm for high-dimensional nonconvex SICA-penalized regression

The smooth integration of counting and absolute deviation (SICA) penalty has been demonstrated theoretically and practically to be effective in nonconvex penalization for variable selection and parameter estimation. However, solving the nonconvex optimization problem associated with SICA penalty in high-dimensional setting remains to be enriched, mainly due to the singularity at the origin and the nonconvexity of the SICA penalty function. In this paper, we develop a fast primal dual active set (PDAS) with continuation algorithm for solving the nonconvex SICA-penalized least squares in high dimensions. Upon introducing the dual variable, the PDAS algorithm iteratively identify and update the active set in the optimization using both the primal and dual information, and then solve a low-dimensional least square problem on the active set. When combined with a continuation strategy and a high-dimensional Bayesian information criterion (BIC) selector on the tuning parameters, the proposed algorithm is very efficient and accurate. Extensive simulation studies and analysis of a high-dimensional microarray gene expression data are presented to illustrate the performance of the proposed method.     

A comparative study of confidence intervals to assess biosimilarity from analytical data

Assessment of analytical similarity of tier 1 quality attributes is based on a set of hypotheses that tests the mean difference of reference and test products against a margin adjusted for standard deviation of the reference product. Thus, proper assessment of the biosimilarity hypothesis requires statistical tests that account for the uncertainty associated with the estimations of the mean differences and the standard deviation of the reference product. Recently, a linear reformulation of the biosimilarity hypothesis has been proposed, which facilitates development and implementation of statistical tests. These statistical tests account for the uncertainty in the estimation process of all the unknown parameters. In this paper, we survey methods for constructing confidence intervals for testing the linearized reformulation of the biosimilarity hypothesis and also compare the performance of the methods. We discuss test procedures using confidence intervals to make possible comparison among recently developed methods as well as other previously developed methods that have not been applied for demonstrating analytical similarity. A computer simulation study was conducted to compare the performance of the methods based on the ability to maintain the test size and power, as well as computational complexity. We demonstrate the methods using two example applications. At the end, we make recommendations concerning the use of the methods.     

析体育生活对大学生社会化发展的影响

文章分析了处于青春期的大学生在社会化过程中的个体心理和社会心理的需要以及社会对大学生发展的要求,指出大学生的社会化发展是个体内在需要和社会环境影响辩证统一发展的结果.体育生活是大学生社会化发展所需的重要的社会环境和主要内容,对大学生的社会化发展有着非常重要的意义.     

天堂寨假日旅游市场调查分析

在实地考察与调查并拥有大量第一手资料的基础上,从旅游客源构成、旅游者行为特征及经济特征、旅游评价、旅游市场空间结构等方面,对天堂寨假日旅游市场进行了具体分析,并探讨了天堂寨旅游市场开发的对策与策略。     

大学生自我效能感与学业成绩关系的研究

学生的自我效能感是个体在特定情境中对自己的某种行为能力的自信程度,是个体对成功实施并达成特定目标所需行为能力的预期、感知和信心,是介于动机和行为之间的动力因素.自我效能感已成为现代教育心理学研究的热点之一.文章对85名在校大学生自我效能与学业成绩之间的关系进行研究.结果表明,(1)不同学业成绩的学生的自我效能感有显著性差异.优秀组的学生自我效能感明显高于较差组.(2)不同性别、不同专业的学生自我效能感的差异并不显著.     

DNS分光光度法测定牛奶中总糖含量的研究

建立了3,5-二硝基水杨酸分光光度法(DNS分光光度法)测定牛奶中总糖含量的方法,并与国标法(直接滴定法)进行比较.结果显示,DNS分光光度法测定结果的准确度与直接滴定法无明显差异.该法操作简单,试剂消耗体积少,稳定性较高,平均回收率为96%~103%.     

毛细管电泳法分离测定饮料中色素含量的研究

建立了毛细管电泳法直接分离测定饮料中日落黄、胭脂红、柠檬黄的方法,研究了缓冲溶液种类、浓度、pH值、电压等对分离的影响.在波长247 nm,分离电压15 kV,pH=10.0,10 mmol.L-1NaH2PO4-10 mmol.L-1Na2B4O7缓冲溶液中,日落黄、胭脂红、柠檬黄在8 min内得到了较好的分离,用于测定市售饮料中三组分含量得到满意结果.     

微型滴定实验研究中几个值得商榷的问题

根据定量化学分析对测定结果的要求和一些自制微型滴定装置的测定结果的比较,探讨了在微型滴定实验过程中出现的几个问题,指出提高微型滴定管读数的准确度,是微型滴定测定结果与常量滴定测定结果没有显著性差异的关键因素之一.