Information content of DSGE forecasts

This paper examines the question whether information is contained in forecasts from dynamic stochastic general equilibrium (DSGE) models beyond that contained in lagged values, which are extensively used in the models. Four sets of forecasts are examined. The results are encouraging for DSGE forecasts of real GDP. The results suggest that there is information in the DSGE forecasts not contained in forecasts based only on lagged values, and that there is no information in the lagged‐value forecasts not contained in the DSGE forecasts. The opposite is true for forecasts of the GDP deflator.     

加热方式对鸡肉制品不同部位脂质氧化的影响

为探讨鸡肉制品在不同加热方式及冷藏期间的氧化情况,选取黄羽肉鸡的胸肉、腿肉、皮下脂肪为原料,对比3个部位脂肪含量和脂质组成；整鸡分别进行微波、烤制、煮制、蒸制处理,检测其初级代谢产物过氧化值与次级代谢产物丙二醛含量。结果表明:中性脂肪含量在皮下脂肪中含量较高,与腿部、胸部存在明显差异,与磷脂分布规律相反；腿部中的多不饱和脂肪酸与必需脂肪酸含量显著高于其他部位；加工与冷藏显著增加各部位丙二醛的含量。储藏4d,各部位过氧化值先上升后下降,煮制后的胸部、腿部与皮下脂肪氧化速度最快,腿部在烤制后丙二醛增长速度最慢,各加热方式间存在明显差异(P<0.01)。     

具有极点型奇点的二阶线性方程与广义解

给出二阶线性方程二阶极点邻域的级数形式解.传统观念认为适合方程的收敛级数才是方程的解.在这种观念的支配下,一些简单情形求得的发散级数形式上使方程成为恒等式,被称为解的渐近展开.发散级数适合方程并非个别现象.这个事实促使我们改变观念,承认使方程成为恒等式的发散级数是方程的(广义).     

Characteristics of ultrafine particle from a compression-ignition engine fueled with low sulfur diesel

Number size distributions （NSDs, 10--487 nm） and composition of nanoparticle emitted from an engine fueled with ordinary diesel （OD） and low sulfur diesel （LSD） fuel were comparatively studied. The results indicate that, compared with the OD, the LSD was found to slightly decrease the mass concentration, and significantly reduce the number concentration of the total particles （10--487 nm）, and the reduction of number increased with the speed and load of engine. The NSD for the two fuels showed a similar bimodal structure under all test engine conditions. Under the same engine conditions, the nucleation mode for LSD fuel was significantly lower than that of ordinary diesel. However, the accumulation mode for the two fuels showed little difference. The elements composition of exhaust particles included C, O, Cl, S, Si, Ca, Na, AI and K. The S element was not detected in LSD fuel case. The main component of soluble organic fraction （SOF） of exhaust particles for the two fuels included saturated alkane （C15-C26）, ester and polycyclic aromatic hydrocarbons （PAHs）. However, PAHs were not found in LSD fuel case.     

天然植物脓疮草中的成分初探

用原子吸收分光光度法测定了脓疮草中的微量元素铁、锌、铜、锰的含量；用硅胶Ｇ薄层层析分离了脓疮草中的生物碱、用聚酰胺薄膜层析分离了脓疮草中的黄酮类有效成分。     

大学生人体成分的现状分析与对策

采用实验法,分析温州大学、温州医学院等高校学生人体成分的现状.结果显示,大四学生与大一、大二、大三学生之间体脂块(BMI)有显著差异,男女生体脂块(BMI)无显著性差异;学生腹部脂肪质量分数超质量型比例女生明显高于男生,大四学生明显高于大一、大二、大三学生;男女生上肢力量明显不足,女生左、右上、下肢肌肉质量分数正常型比例明显低于男生;大学生体内水分缺少比例最高,蛋白质缺少比例排第二.因而应制定合理的运动处方与营养处方,改善大学生人体成分现状,提高大学生的健康水平.     

CCTV-5跨媒体期刊《第五频道》娱乐的构成及运用

《第五频道》期刊围绕“炫与释放激情”的主题,以娱乐的风格报道体育新闻,打造了一本全新的时尚体育期刊,彰显出体育新闻中的娱乐元素在现今体育新闻报道环境中的适应性与丰富性,体现了时尚与体育融合的精彩.     

Whole-genome based Archaea phylogeny and taxonomy: A composition vector approach

The newly proposed alignment-free and parameter-free composition vector (CVtree) method has been successfully applied to infer phylogenetic relationship of viruses, chloroplasts, bacteria, and fungi from their whole-genome data. In this study we pay special attention to the phylogenetic positions of 56 Archaea genomes among which 7 species have not been listed either in Bergey’s Manual of Systematic Bacteriology or in Taxonomic Outline of Bacteria and Archaea (TOBA). By inspecting the stable monophyletic br...     

一种基于语义本体的Web服务自动组合算法

服务组合是Web服务应用的一个重要研究方向。提出了一种基于语义本体的Web服务自动组合算法,该算法用Web服务本体OWL-S和领域本体描述Web服务,将两个服务之间关联度的计算转化为加权二部图的最优匹配问题,然后利用改进的Kuhn-Munkres算法计算服务关联度;最后,在此关联度的基础上提出一种服务自动组合算法。实验结果表明,论文提出的服务组合算法可以根据用户请求动态的生成服务组合,并通过域值控制保证了服务组合的质量和效率。