Decay Rate Kinetics of Ozone Gas in Rice Grains

The present study was carried out to evaluate the effects of ozone on rice grains for the following three conditions: saturation time, decay rate, and half-life of ozone. Experiments were performed in different bed thicknesses (5 and 10 cm) and moisture content (11.4 and 14.2% wb) at atmospheric conditions. The lowest saturation time of ozone was 119 min, with the concentration of 516 ppm for rice grains ozonated at 5-cm bed thickness with 11.4% (wb) moisture content. The decay rate kinetics of ozone obtained were consistent with a first-order model. Regarding the half-life of ozone, the lowest value obtained was 6.78 min for rice grains ozonated at 10-cm bed thickness with 14.2% (wb) moisture content.     

泡沫沥青稳定技术在新西兰的应用

介绍了泡沫沥青稳定技术在我国沥青路面冷再生中的一些应用情况。为了推动这项技术的快速发展，重点介绍新西兰泡沫沥青混合料配合比的设计方法及混合料的力学特性。主要包括比较两种油源各两种标号的沥青的发泡特性，提出了泡沫沥青的技术指标。采用常用的矿料级配配制泡沫沥青混合料，研究了混合料的设计方法（包括最佳含水量及泡沫沥青含量的确定），比较了3种室内压实方法对混合料密度的影响。同时，分析了水泥对泡沫沥青混合料不同龄期强度的影响，并推荐了泡沫沥青冷再生路面的开放交通时间。     

Purification and characterization of a novel glucoamylase from Fusarium solani

Thermostable enzymes are currently being investigated to improve industrial processes of starch saccharification. A novel glucoamylase was purified to electrophoretic homogeneity from the culture supernatant of Fusarium solani on a fast protein liquid chromatographic system (FPLC). The recovery of glucoamylase after gel filtration on FPLC was 31.8% with 26.2-fold increase in specific activity. The enzyme had a molecular mass of 40 kDa by SDS-PAGE and 41 kDa by gel filtration. The glucoamylase exhibited optimum activity at pH 4.5. The K_cat and K_m were 441/min and 1.9 mg/ml, respectively, for soluble starch, specificity constant (K_cat/K_m) was 232. The enzyme was thermally stable at 50 °C and retained 79% activity after 60 min at this temperature. The half-life of the enzyme was 26 min at 60°C. The enzyme was slightly stimulated by Cu²⁺ and Mg²⁺ and strongly inhibited by Hg²⁺, Pb²⁺, Zn²⁺, Ni²⁺ and Fe³⁺.     

Absorption of shocks in nonlinear autoregressive models

It generally is difficult, if not impossible, to fully understand and interpret nonlinear time series models by considering the estimated values of the model parameters only. To shed light on the characteristics and implications of a nonlinear model it can then be useful to consider the effects of shocks on the future patterns of the time series variable. Most interest in such impulse response analysis has concentrated on measuring the persistence of shocks, or the magnitude of their (ultimate) effect. A framework is developed and implemented that is useful for measuring the rate at which this final effect is attained, or the rate of absorption of shocks. It is shown that the absorption rate can be used to examine whether the propagation of different types of shocks, such as positive and negative shocks or large and small shocks follows different patterns. The nonlinear floor-and-ceiling model for US output growth is used to illustrate the various concepts. The presence of substantial asymmetries in both persistence and absorption of shocks is documented, with interesting differences arising across magnitudes of shocks and across regimes in the model. Furthermore, it appears that asymmetry became much less pronounced due to a large decline in output volatility in the 1980s.     

原子质量和核的基态特征常数子库的数据文件和管理－检索程序系统（CENPL·MCC－1）

原子质量和核的基态特征常数库是中国评价核参数库的一个子库，该子库存贮了核的质量亏损、丰度及基态半衰期。自旋、宇称等核的基本数据，并发展了库管理－检索程序系统。该系统不仅能检索库中的数据，还可用不同核素质量的组合，派生多种新数据。文章描述库数据文件及程序，系统，介绍了系统的功能、特点及使用方法。     

Identification of neutron-rich isotope 197Os

1 Introduction In the last few decades, the medium energy pro-ton facilities have played an important role in the dis-covery of new neutron-rich heavy isotopes.[1,2] Simul-taneously, a great number of new neutron-rich heavyisotopes have also been s…     

Novel Pragmatic Turbidimetric Data Analysis Method for Evaluating the Stability of Emulsions

A novel pragmatic turbidimetric data analysis method for evaluating emulsion stability by using a spectrophotometer is proposed. An overview of this method is shown in a flowchart. The advantage of this method is that it uses change in turbidity against time, which allows it to be applied to all emulsions and food scientists to easily calculate half-life time. A high half-life time shows that turbidity is decreased slowly and that the emulsion state can be kept for a long time. Due to this simplicity, it is hoped that this will become a commonly used method.     

142La半衰期的测定

142La是核燃料裂变燃耗测定用的重要核素,但其半衰期的文献值差异很大.本文详细阐述了用阱式HPGe探测器质量接续法和同轴型HPGe探测器连续跟踪法测定142La半衰期的原理和过程,测定结果为(90.78±0.16)min.     

Half-life estimation based on the bias-corrected bootstrap: A highest density region approach

The half-life is defined as the number of periods required for the impulse response to a unit shock to a time series to dissipate by half. It is widely used as a measure of persistence, especially in international economics to quantify the degree of mean-reversion of the deviation from an international parity condition. Several studies have proposed bias-corrected point and interval estimation methods. However, they have found that the confidence intervals are rather uninformative with their upper bound being either extremely large or infinite. This is largely due to the distribution of the half-life estimator being heavily skewed and multi-modal. A bias-corrected bootstrap procedure for the estimation of half-life is proposed, adopting the highest density region (HDR) approach to point and interval estimation. The Monte Carlo simulation results reveal that the bias-corrected bootstrap HDR method provides an accurate point estimator, as well as tight confidence intervals with superior coverage properties to those of its alternatives. As an application, the proposed method is employed for half-life estimation of the real exchange rates of 17 industrialized countries. The results indicate much faster rates of mean-reversion than those reported in previous studies.     

Half-life measurement of neutron-rich isotope 237Th

1 INTRODUCTIONIt has been rePorted[1l that the new neutron-rich isotoPe 237Th was produced via'"U(n,2P):"Th reaction by 14MeV/u neutron irradiations of natural uxedum and thehdelife of:3vTh has been given. Some experimental results reveal that in multi-nucleontransfer reaction (MNTR), neutron-rich projectile, neutron-rich taxget and reasonablyhigher incident energy favor the production of a heavy neutron-rich nuclei. In addition,dissiPative fragmntation of heavy taxget in the interme…