oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

2019 ( 78 )

2018 ( 1592 )

2017 ( 1727 )

2016 ( 1734 )

Custom range...

Search Results: 1 - 10 of 85668 matches for " 诸林 "
All listed articles are free for downloading (OA Articles)
Page 1 /85668
Display every page Item
天然气含水量的估算
,王兵
天然气工业 , 1995,
Abstract: ?文章对确定天然气含水量的算图进行了归纳,并介绍了一种新的算图,通过对比分析,推荐采用麦凯塔-瓦赫(mcketta-wehe)算图与韦切尔特(wichert)辅助计算图结合来估算活性天然气的含水量.
生物质空气气化过程的有效能分析
,陈虎,蒋鹏
过程工程学报 , 2015,
Abstract: 以空气为气化介质,选取松木、玉米秸秆、木屑为气化原料,运用ASPENPLUS软件并结合Fortran编程对基于自热固定床反应器的生物质气化过程进行了模拟,探讨了空气当量比(ER)和生物质含水量对干气低位热值、气化炉温度、干气组成和气化有效能效率的影响.结果表明,在生物质含水量一定时,随ER增加,干气低位热值降低,气化温度升高,干气中CO含量先增加后减少,H2含量降低,有效能效率先升高后降低;ER一定时,随生物质含水量增加,干气低位热值降低,气化温度先降低后升高,干气中CO含量降低,H2含量先升高后降低;当松木、玉米秸秆、木屑的含水量为20%(w)、ER分别取0.25,0.2和0.15时,最大有效能效率分别为61.67%,60.23%和54.98%.
土地利用遥感动态监测应用研究——以兰州安宁区为例
云强,孙九
资源科学 , 2006,
Abstract: 土地利用遥感动态监测能够快速提取土地利用变化信息,更新土地利用现状图,对于土地资源合理利用、科学管理具有重要的意义。探讨了土地利用遥感动态监测的技术流程:遥感影像处理、年度变化信息提取、外业调查、内业后处理与精度评定。重点对遥感纠正模型选择、融合方法和精度评定方法进行了比较研究。为了兼顾山区和平原2种地形,采用分区选点,山区采用有限元模型,平原采用多项式模型进行纠正,分区接边处保证10个~50个像素的重叠带。由于土地利用动态遥感监测主要是监测建设用地、耕地的变化,因此融合方法选用能够充分利用多光谱影像信息突出地物纹理边界的主分量变换法。以兰州市安宁区为例,提取了该区2002年~2003年度的土地利用变化信息,利用点位中误差法对其监测精度进行了评定。研究结果表明安宁区2002年~2003年度土地利用变化全部发生在城区,基本上是由农用地变化为建设用地,这与安宁区近几年为满足国家经济开发区和兰州高新技术产业区建设、经济发展的需求,加快了城市建设有直接关系。
土壤的养分状况和作物的营养诊断――以饲料作物对钾的吸收为例
?英行,心清
南京农业大学学报 , 1981, DOI: 10.7685/j.issn.1000-2030.1981.03.013
Abstract: 这是摘译于《日本土壤肥料学杂志》1979年第50卷第4期的一篇文献综述。文章将作物营养诊断和土壤养分状况联系起来,在理论及生产应用上做了综述,同时也反映出目前国际上这方面研究工作的进展情况。原文附有日、美等国文献65篇,文内论据均注明文献出处,刊登时将其删略。
基于化学链制氧的煤气化集成系统工艺参数分析
,张政,范峻铭
化工进展 , 2014,
Abstract: 利用化学链制氧(chemicalloopingairseparation,CLAS)取代传统空气分离制氧技术,提出了基于化学链制氧的煤气化集成系统。以Mn2O3/Mn3O4为氧载体,依据Gibbs自由能最小化原理,利用AspenPlus对该集成系统进行模拟研究。结果表明,当还原温度高于840℃时,还原程度和粗煤气温度不随还原温度增加而发生明显变化,H2、CO和CH4流量及含量变化趋势较平缓,冷煤气效率为80%左右;随CO2循环比增大,水蒸气用量逐渐减少,粗煤气中H2流量和含量降低,CO流量和含量升高,CH4流量和含量基本不变,冷煤气效率升高,粗煤气温度降低。气化压力变化对粗煤气中H2、CO和CH4流量和含量无明显影响,气化压力升高会降低冷煤气效率,提高粗煤气温度。
天然气含水量的公式化计算方法
,白剑,王治红
天然气工业 , 2003,
Abstract: ?天然气含水量的计算是天然气工业有关工艺设计、生产装置考核、水合物抑制剂的使用等过程中经常用到的主要计算。公式化计算又分成两类:一类是基于已知气体干基组成,通过使用状态方程进行水烃体系平衡计算获得;另一类则基于已知温度、压力条件,采用经验或半经验的对已有实验数据或图表的回归分析而获得。公式化计算避免了图算法的人为误差,同时又方便计算机处理,在天然气处理和加工计算中得到普遍认同。文章对目前国内外已有的主要公式化的计算方法进行了归纳分析,考查了计算结果并推荐了可信的计算方法。
苏叶有效成分的提取及其测定
刘宗,思燕
食品科学 , 2001,
Abstract: ?苏叶的有效成分为挥发油,腺嘌呤和黄酮类化合物,对挥发油的气一质色谱分析,其主要成分为芳樟醇、紫苏酮、异白苏烯酮、反式丁香烯及丁香烯的氧化物。
pt/nd2o3-wo3/zro2催化甘油氢解制1,3-丙二醇
晓东,陈长
南京工业大学学报(自然科学版) , 2013, DOI: 10.3969/j.issn.1671-7627.2013.01.005
Abstract: 制备不同nd2o3质量分数的2%pt/nd2o3-wo3/zro2催化剂。通过n2物理吸附,nh3程序升温脱附(nh3-tpd)、h2程序升温脱附(h2-tpd)、co脉冲吸附等方法表征催化剂的物理化学性质。用固定床连续流动反应器考察催化剂对甘油氢解制1,3-丙二醇反应的催化性能。结果表明,引入nd2o3提高了催化剂的h2吸附量,进而提高了催化剂的催化活性;焙烧温度对催化剂性能有重要影响。在4mpa、130℃、质量分数为60%甘油水溶液进料、液体体积空速(lhsv)0.25h-1反应条件下,2%pt/0.25ndwz(700,450)催化剂催化甘油氢解反应,甘油转化率为75.2%,1,3-丙二醇产率达28.9%,产物中n(1,3-丙二醇)/n(1,2-丙二醇)达到21.9。
NEW STARTING POINT OF ENVIRONMENTAL GEOCHEMISTRY:RESEARCH OF NONLINEAR ENVIRONMENTAL GEOCHEMICAL PROCESSES
环境地球化学的新起点——非线性环境地球化学过程的研究

程鸿德,庆华,,
第四纪研究 , 1993,
Abstract: This paper systematically reviewed and summarized the research of environmental geochemistry, based on the author's experiences of more than 20 years study, the latest development in this area at home and abroad predicted its potential trend, and finally put forward the new starting point of 90's Chinese scientific research of environmental geochemistry research of nonlinear environmental geochemical processes. Either natural phenomenon or social phenomenon possess one generality——nonlinear interaction. Linear model is only the first approximation of understanding the development processes of objective matter, while nonlinear model is a sophisticated fit of revealing their development and change processes. It is a g(?)neral historical trend to study the laws of nature and society by nonlinear mathematic model. It is undoubtly the needs of times and the development of this field that this model should be applied in the research of environmental geochemical processes. There exists a remarkable difference between environmental geochemical processes and general geochemical processes because the system structure of the former is open and involves more complex influencial factor, not only, influenced by sorts of natural action, but also suffered enormous anthropogenic disturbances hence causing the polytropic character of its evolution rate and direction. Therefore it is rather difficult or even impossible to study the complex processes by traditional geochemical method. Along with the scientific advancement, especially the development of computer technique, a feasible research way has become available for people to study complex nonliear environmental geochemical processes. Environmental geochemical processes generally occur on the environmental media and interface of external geosphere, i. e., atmosphere, hydrosphere, biosphere and lithosphere, where matter flow and energy flow are continiously exchanged, and nature is also changing unceasingly. New achievement of modern sciences, including chemical thermodynamics, chemical kinetics, nonlinear planning, special function, spectrum analysis, Laplace transform, mathematic geology, measuring technique and so on, provides condition and method for the research of nonlinear environmental geochemical processes. Several nonlinear mathematic models of environmental geochemical processes in common use are summarized, including nonlinear static state model of environmental geochemistry, nonlinear dynamic state model of environmental geochemical processes, kinetics model of life elements in geochemical cycle processes, nonlinear coupling model of element cycle, reaction mecharnism model of environmental geochemical processes and so on. In these researches, the theory of in- terface reaction, nonequilibrium process thermodynamics and nonreversible process thermodynamics is widely applied. The approach of nonlinear environmental geochemical processes——the combination of comprehensive analysis, systematic analysis a
盐酸介质中双子表面活性剂对N80钢的吸附缓蚀性能
刘红,,,邓骥
腐蚀科学与防护技术 , 2014, DOI: 10.11903/1002.6495.2013.247
Abstract: 采用静态失重法、电化学方法和扫描电镜等方法,研究了一种双子表面活性剂(DBA2-12)对N80钢在盐酸介质中的吸附缓蚀性能。结果表明,DBA2-12对N80钢在1mol/L的盐酸溶液中具有较好的缓蚀性能。随着缓蚀剂浓度的增加,缓蚀率增大;随着实验温度升高,缓蚀率减小。该缓蚀剂在N80钢表面的吸附遵循Langmuir吸附等温式,是一种混合抑制型缓蚀剂。
Page 1 /85668
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.