高校图书馆电子信息资源利用情况调查分析——以东北电力大学图书馆为例

采用调查问卷的形式,对东北电力大学图书馆电子信息资源的利用情况和读者需求情况做了调查分析,针对当前高校图书馆电子信息资源利用存在的问题,从电子信息资源的扩大宣传、加强培训、合理配置和提高信息服务等方面,提出合理化建议,以其达到提高电子信息资源利用效率的目的。     

Discrimination between Japanese and Chinese Products using trace elements concentration of kernel in pickled Japanese apricot

pp. 875–880

The trace-element composition of kernel in pickled Japanese apricot (Prunus mume Sieb. et Zucc.) was determined using an inductively coupled plasma optical emission spectrometer in order to distinguish between Japanese products and Chinese products.

Strontium and barium concentrations in the kernels of Chinese products were 10 or more times those of the Japanese ones. When based on 8.0 mg kg^?1 of strontium concentration in kernel, 93.2% of sample was distinguished as Japanese products or Chinese ones.

Applying principal component analysis using 9 elements (Mn, Zn, Fe, Ni, Ba, Sr, Cu, Co, Cr), the pickled Japanese apricots tend to separate into two countries. Linear discriminant analysis (LDA) using 9 elements allowed a reasonable classification of pickled Japanese apricots according to the country of production.

The result of the analysis of K-nearest neighbors (KNN) was better than that of LDA.     

中草药制剂对泌乳奶牛机体免疫性能的影响

试验采用大青叶、大黄、党参等19味中草药分别组成内服和子宫灌注制剂治疗奶牛子宫内膜炎，并采集颈静脉血测定淋巴细胞刺激指数（SI）和中性粒细胞吞噬力，以观察中草药制剂对奶牛免疫性能的影响。结果显示，中草药制剂均可提高奶牛免疫力，内服中草药制剂应用效果优于子宫灌注制剂（P〈0．05）；复方制剂优于单味中草药制剂（P〈0．05）；复方中草药内服制剂可使淋巴细胞刺激指数（SI）和中性粒细胞吞噬力分别提高53．76％和4．58％（P〈0．01）；复方子宫灌注制剂可使淋巴细胞刺激指数（SI）和中性粒细胞吞噬力分别提高39．58％和1．98％（P〈0．01）。     

Examination of thermal and acid hydrolysis procedures in characterization of soil organic matter

Abstract

Differential thermogravimetry (DTG), differential scanning calorimetry (DSC), and stepwise thermogravimetry (STG), together with two acid hydrolysis methods (hydrolysis with hydrochloric acid in a single step, and hydrolysis with sulfuric acid in two steps), were evaluated to determine the quality of four plant materials (Medicago sativa, Eucalyptus globulus, Quercus ilex, and Pinus halepensis) before and after mixing with a red earth. These quality indices were then compared with the same materials in the field, whether their decomposition could be predicted. All the thermal methods gave poor results. In both DTG and DSC, the presence of the mineral matrix gave rise to strong distortions in the spectra. Since the spectrum of any mixture is not simply the sum of the spectra of the two components (organic matter + mineral matter), these distortions could not be corrected by simply subtracting the spectrum of the red earth alone. STG trials also gave poor results, because the presence of the mineral matrix greatly increased the quality indices, and reduced the ability of the method to distinguish between organic matter qualities. In view of our results, the usefulness of thermal methods in the characterization of soil organic matter would seem to be restricted to certain organic horizons (L, F, and perhaps H). In contrast, methods based on acid hydrolysis were comparatively more satisfactory. Their resolution (ability to distinguish organic matter qualities) was much higher than that of thermal methods. However, they were able to distinguish carbon more accurately than nitrogen. The sulfuric acid method, unlike the hydrochloric acid method, was affected by the presence of a mineral matrix. While both methods could be improved, in their present form they seem to operate as good predictors of carbon and nitrogen mineralization.     

基于项目的模拟电子技术课程教学模式研究

以《模拟电子技术》课程为对象,对基于项目的教学模式进行了探讨,主要提出了项目法教学的研究内容及需要解决的关键问题,并给出了具体的实施办法。     

变采样周期和数据包随机丢失的NCS鲁棒H∞ SymboleB控制

在消费者对商品价格与供货时间的偏好假设下，建立一个厂商关于电子商务与传统商务交易方式选择的完全信息静态博弈模型，其纳什均衡表明了电子商务与传统商务潜在的发展趋势，特别是两者可能的市场剖分关系.确切而言，若市场满足既定假设，均衡条件下的电子商务交易方式表现为较长的供货时间及低于传统商务约40%的市场交易价格，将获得三分之一的市场份额.     

Intellectual Property: Information Ownership in the Electronic Age: The Government Perspective: Government's Role in Striking a Balance in the Public Interest

ABSTRACT

An overview of the National Agricultural Library's eleven specialized information centers is presented that includes information on electronic access to their databases, publications, and information.     

Can epidemiology and economics make a meaningful contribution to national animal-disease control?

The general role of veterinary epidemiology and economics to national animal-disease control throughout the world is considered for the four main groupings of animal diseases: zoonotic, food-borne, endemic and epidemic diseases. This is done by considering how veterinary epidemiology and economics has contributed to priority setting (which diseases come first?), decision-making (for a given disease, which strategy is best?), and disease control implementation (how can optimal delivery and adoption of selected interventions best be achieved?). Within each of these categories, progress made and future opportunities are discussed. In addition, a review is made of how veterinary epidemiology and economics has been institutionalised. We conclude that veterinary epidemiology and economics holds a unique role in the development of national policies and strategies for improved animal health world-wide. However, we consider that we must capitalise more on the unique comparative advantage of the partnership between veterinarians and agricultural economists. We believe that much remains to be done to improve the "institutionalisation" of veterinary epidemiology and economics, and the adoption and impact of the products of our unique partnership, particularly in countries of the developing world.