陕西古农书大略

陕西古农书在我国农业遗产宝库中占有光彩夺目的地位,见诸古籍目录者约37种,现存28种。内容丰富,体裁多样,既有大全式整体农书,也有分门别类的专业农书.包含耕桑树畜各部门生产技术知识,具有传统经验农学的理论体系。本文在廓清历代官私书目基础上,分五个历史阶段,系统评述了陕西古农书起始、发展及最终被现代农业科学取代的历史过程,全面展示了陕西古代农业科学的光辉成就。     

论古农书的目录

农史学界历来有编纂古农书目录的传统,前辈学者的研究已经取得了很大的成绩。但是有四个问题值得反思:第一,农书目录对于"农书"本身的定义不清;第二,不同农书目录对于收书范围的认识差异颇大;第三,农书目录在著录时的错误依旧广泛存在;第四,农书目录的著录体例亟待更新。本文对以上四个问题的思考与提出意见,有助于新的农书目录编纂。     

古代农书中天文及术数内容的来源及流变——以《四时纂要》为中心的考察

传统农书中有大量天文术数内容,在这方面<四时纂要>是一个典型.通过分析,认为该书中的天文术数内容主要来自于月令书、<史记·天官书>等古天文书以及术数书;这些内容在战国至秦汉时期因农家与阴阳五行学说及民间方术之间的互动而进入农学领域,并因后世农书所采用的经学注疏方法而得以不断传承和拓展,<四时纂要>对前代农书中的天文术数内容作了系统的整理归纳.至于农书中引入天文术数内容的原因,现象授时的传统为天文术数内容进入农书打开了方便之门,而天文术数内容在农事安排中所起的背景作用使其有必要成为农书的一个组成部分,术数在唐朝社会上的流行则为<四时纂要>归纳整理农学中的天文术数内容提供了现实基础.     

浅谈高校图书馆书目信息服务

本文根据部分高校图书馆书目信息服务的现状,分析了书目信息服务中存在的问题,提出了建立完善的书目信息服务系统、服务创新等方面的解决对策。     

试论书目情报商品化

本文运用马克思主义商品经济理论,从书目情报的商品属性,生产书目情报的劳动二重性和书目情报价值与价格的确定等几个方面,对书目情报商品化这一问题进行探讨,以促进我国信息情报产业的发展,更好地为经济建设服务。     

常用外文图书网站评介

掌握网络书目的检索功能,善用网络书目是外文图书采访工作必备的技能.对亚马逊网上书店、布莱克维尔图书公司网站、中图书苑和中国教育图书进出口总公司进口部网站的检索功能、书目内容等进行了详细介绍.     

中国古代足踏式风扇车考释与复原

足踏式风扇车的图、文始见于元代的《王祯农书·农器图谱·飏扇》.图中的风扇车是半敞开风箱结构足踏驱动的风扇车,用于清除场圃间揉打脱粒后粮食籽粒中的糠、穰等杂物,也是目前所知我国古代唯一形制的足踏式风扇车.在辨析古今有关《王祯农书·农器图谱·飏扇》的释读错误的同时,考释了足踏式风扇车的结构、功用,并进行了复原,最后分析了包括设计、结构方面的局限等在内的导致其较早退出农业生产领域的原因.     

浅谈高校图书招标采购的后期质量控制

介绍了图书招标采购的组织模式,从采访书目、书目数据、到书率、到书周期等方面探讨了如何加强图书招标采购的质量控制。     

图书馆全面网络化和共享化实现的一个标志

本文从传统条件下的目录与书目的关系着手，揭示了目录与书目在作用对象、使用对象和编制目的等方面的差异。在现代计算机网络联机编目逐步广泛应用的背景下，分析了目录与书目在各方面的差异呈逐渐缩小的趋势，提出了“目录与书目的融合是图书馆界全面网络化和共享化实现的一个标志”这一观点。     

图书馆全面网络化和共享化实现的一个标志--浅谈目录与书目及其差异的日趋缩小化

本文从传统条件下的目录与书目的关系着手,揭示了目录与书目在作用对象、使用对象和编制目的等方面的差异。在现代计算机网络联机编目逐步广泛应用的背景下,分析了目录与书目在各方面的差异呈逐渐缩小的趋势,提出了“目录与书目的融合是图书馆界全面网络化和共享化实现的一个标志”这一观点。     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

橡胶颗粒沥青混合料低温抗裂性试验研究

以AC-13级配为基础,将橡胶颗粒代替部分集料掺入混合料中,以低温弯曲试验为评价方法对不同橡胶颗粒掺量下沥青混合料的低温抗裂性进行研究,并引入应变能密度值对混合料的低温抗裂性进行综合评价.试验结果表明:橡胶颗粒沥青混合料试件的破坏微应变均超过2 300,满足冬寒区的技术指标;无论是否掺加橡胶颗粒,随着温度的下降,沥青混合料破坏时的最大弯拉强度增大,弯拉应变降低,劲度模量增大;弯曲应变能密度在胶粒掺量为1%左右时具有较大的弯曲应变能密度值,此时橡胶颗粒沥青混合料具有较好的低温抗裂性.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-