试析墨子比喻的类型及作用

墨子在谈辩中对比喻曾有灵活多变的运用.就整体而论,这些比喻可划分为同喻和异喻.其中,前者又可进一步划分为单喻、复喻和博喻,后者又可进一步划分为本体全异于喻体、本体弱于喻体和本体强于喻体.墨子谈辩中比喻的作用是多方面的,主要涉及阐释己见、驳斥论敌、催人省悟以及止事成义.     

胜利油区砂岩成岩作用及油层保护措施研究

胜利油区不同埋藏成岩带的砂岩储集层的成岩矿物、孔隙类型、储集性以及敏感性矿物不同,造成储集层的潜在伤害类型的差异。浅埋藏砂岩储集层的潜在伤害是粘土膨胀和出砂,油层保护的重点措施是机械筛网、屏蔽暂堵和添加防膨剂;中埋藏砂岩储集层中微粒运移,粘土膨胀和孔喉堵塞是主要伤害形式,其保护措施主要是添加稳定剂和防膨剂;深埋藏砂岩储集层潜在伤害类型主要是固相颗粒堵塞,无机结垢等引起的渗透率下降,其保护措施主要是添加稳定剂及铁螯合剂,复合酸酸压和屏蔽暂堵等,同一埋藏深度的砂岩储集层,由于沉积特征,成岩演化和储集层特征的差异,决定了其潜在伤害类型的差异,应有针对性地采取措施,以获得最佳的经济效益。     

Axisymmetric fundamental solutions for a finite layer with impeded boundaries

Axisymmetrie fundamental solutions that are applied in the consolidation calculations of a finite clay layer with impeded boundaries were derived. Laplace and Hankel integral transforms were utilized with respect to time and radial coordinates, respectively in the analysis. The derivation of fundamental solutions considers two boundary-value problems involving unit point loading and ring loading in the vertical. The solut-ions are extended to circular distributed and strip distributed normal load. The computation and analysis of set-tlements, vertical total stress and excess pore pressure in the consolidation layer subject to circular loading are presented.     

A novel long-chain acyl-derivative of epigallocatechin-3-O-gallate prepared and purified from green tea polyphenols

Lipophilic tea polyphenols (LTP) were prepared by catalytic esterifieation of green tea polyphenols (GRIP) with hexadeeanoyl chloride. A novel long-chain aeyl-derivative of epigalloeateehin-3-o-gallate(EGCG) was first isolated from purification of LTP by high-speed eountereurrent ehromatography (HSCCC)using a solvent system composed of n-hexane-ethyl acetate-methanol-water ( 1 : 1 : 1 : 1, v/v) . The moleeularstructure of the acyl-derivative, Epigallocatechin-3-O-gallate-4‘-O-hexadeeanate , was elucidated by meansof elemental analysis, IR, 1H-NMR and MS spectra.     

Hf isotope composition of zircons and implication for the petrogenesis of Yajiangqiao granite,Hunan Province,China

In the peralumineous granite of Yajiangqiao zircon population can be divided into two groups (i.e. Zircon Ⅰ and Zircon Ⅱ), which were formed in magmatic chamber and in emplacement place, respectively. The Hf isotope compositions of two stages of zircon show that the host magma was essentially derived from crustal material by melting. However, some higher 176Hf/177Hf ratios indicate that the granitic zircons should contain fine crystal of zircon formed in mantle-derived magma. In fact, the backscattered electron imaging and the electron microprobe analysis reveal that there is another type of zircon included within Zircon Ⅰ, which is quite different from Zircon Ⅰ and Zircon Ⅱ in morphology and chemistry. They are considered to be the product of the mantle-derived magma intruded into the granitic magma chamber at the beginning of anatexis. Thus,it is suggested that the formation of Yajiangqiao granite is related to the underplating of mantle magma.     

Geochronology of source materials from high-pressure and ultrahigh-pressure metamorphic rocks in Jurassic sedimentary rocks of Hefei Basin

Eclogite cobbles were discovered by Wang et al. (2001) in the Fenghuangtai Formation of the northern margin of Dabie Mountains in the Dushan area of Anhui Province, China[1]. They proposed that after the formation during the Triassic, the high-pressure (HP) and ultra-high-pressure (UHP) metamorphic rocks reached the sur-face through exhumation and uplifting before the late Ju-rassic. However, they have not provided any evidence about isotopic ages. One kind of cobbles of HP-UHP rocks w…     

Effect of bromization on the propertises of a series of substituted 1,8,15,22—tetra（2,4—ditertbutylphenoxy） phthalocyanines

A series of 1,8,15,22-tetra(2,4-ditertbutylphen-oxy) phthalocyanines [α-（oAr）4PcM,M1=(H)2,M2=Pd,M3=Cu,M4=Zn,M5=Pb] were synthesized in this study.Each compound was bromized in two kinds of solvent.One is the solvent mixture of 1,1,2-trichloroethane and water,the other is 1,1,2-trichloroethane alone.The effects of solvent,bromine excess added and reaction duration on the bromization reaction were studied.The shift of maximum absorbance wave-length both is solution and in solid thin film was investigated comparatively,discovering that both were bathochromism but the former was more.TG data showed that the temperature of thermal decomposition decreased continuously with the increase of numbers of bromine.Finally,the fragments produced during the bromization of (OAr)4PcPb in 1,1,2-trichloroethane were characterized by GC/MS.Based on the electronic structure,the possible mechanism of decomposition of these compounds was presented and discussed.     

论煤炭企业统计工作指导生产的作用

介绍了统计工作在煤炭企业统计工作中的重要作用,并对煤炭企业如何做好统计工作,从3个方面进行了论述.     

异丙酚镇静遗忘作用在硬膜外麻醉期间的应用

探讨异丙酚的镇静遗忘效果,对200例在硬膜外麻醉下行下腹部手术的患者在手术中分别应用异丙酚或杜冷丁、氟哌利多,观察手术过程中的镇静遗忘效果.     

图书馆在学校教育中的作用

作者以自身实践出发,从5个方面论述了学校图书馆在学校教育中的作用。