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The following points are emphasized:The operation models of adiabatic and diabatic distillation have been set up and the operation block, thermodynamics model and mathematical model in the simulation have been determined as well;(2)Based on the simulation and exergy analysis with Aspen Plus program, shortcut distillation design—DSTWU model and rigorous distillation design—RADFRAC model, the author has determined the heat duty, exergy losses and the distribution of exergy losses along the adiabatic column, which will help the simulation and optimization of the diabatic distillation;(3)Diabatic distillation under various operation conditions has been simulated by using energy balance method and exergy analysis;(4)How the different mixture and the various degree of separation, number of trays and feed location influence exergy saving in diabatic distillation have also been discussed;(5)On the basis of the total exergy losses along the column, different schema of the heat transfer distribution along the column have been compared and analyzed;they can be classified in three categories: heat duty equipartition approach, empirical approach, separation degree matching approach. In conclusion, different heat transfer distribution along the column will have effect on total exergy losses. In particular, most satisfactory results have been obtained by using separation degree matching approach. In order to diminish the exergy losses, heat transfer distribution should meet the needs of the request of separation degree.And on this premise, the author makes his suggestion in increasing the proportion of heat supplied to the tray with minimum exergy losses and decreasing the proportion of heat supplied to the tray with the maximum exergy losses.
本文对透热精馏过程进行了模拟并对其节能效果的影响因素做了较为全面的分析和深入的研究,主要研究内容如下:(1)建立了常规精馏和透热精馏过程的模拟操作模块、热力学模型以及数学模型;(2)利用化工模拟软件Aspen Plus并分别采用DSTWU简捷模型和RADFRAC严格计算模型对常规精馏进行模拟计算和有效能分析,确定常规精馏塔的公用工程热负荷、有效能损失及有效能损失在塔内的分布,为透热精馏的模拟和优化提供数据参考;(3)对不同物系在不同分离度条件下进行透热精馏的模拟,分别采用能量衡算法和有效能分析法进行计算和分析;(4)探讨了各种因素如物系的选择、不同分离度、塔板数、进料位置对透热精馏节能效果的影响;(5)以全塔总有效能损失为比较基准,对热量在塔内的三种分布方案即热负荷平均分配法、经验法和分离度匹配法进行了对比分析并得出结论:塔内热量的不同分布方案对于全塔总有效能损失会产生影响,其中以分离度匹配法的节能效果最为理想,为减少有效能的损失,应使塔内的热量分布满足各塔板的分离度要求,并在此前提下,尽量减小有效能损失大的塔板的热负荷和增加有效能损失小的塔板的热负荷。
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On monday.I have muesli,On tuesday, I have cornflakes,On wednesday, I have toast with jam.On tursday, I have rolls,On friday,I have brown bread,On saturday and sunday, I have a lot of pancakes
歌词大意:星期一,我的早餐是牛奶什锦早餐,星期二,我的早餐是玉米片,星期三,我的早餐是果酱加烤面包,星期四,我的早餐是面包卷,星期五,我的早餐是黑面包,星期六和星期日,我吃了很多的薄煎饼。
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In this paper, the 3-D finite element relocating mesh method is used to calculate the temperature field and the thermal creep stress field of spillway dam and mid level outlet dam in certain roller compacted concrete gravity dam, sensitivity analysis have been down with different parameters, such as placing temperature, the location of cooling pipe, cooling temperature, time for water supply, ascended-layer of concrete, intermissive time and different placing time, and the commendatory construction scheme have been put forward in such analysis; according by the test result on the two scheme of concrete aggregate combination (basalt as coarse aggregate and limestone as fine aggregate, basalt as coarse aggregate and basalt as fine aggregate), simulation analysis on temperature field and thermal creep stress field of the commendatory construction scheme have been down, and analysis have also been down on temperature field and thermal stress field of the two different aggregate combination, the result indicates that the spillway dam and mid level outlet dam which adopted these two aggregate combination can both satisfy the require of design crack resistance in concrete, furthermore limestone as fine is better than basalt as fine aggregate; the effect of summer water storage and winter water storage on the temperature field and thermal stress field have been analyzed, comparing with winter water storage, in summer water storage scheme the maximum tensile stress at abnormal concrete in upstream fill is decreased by 0.1~0.3MPa and there are no evidence change of the maximum tensile stress at other parts, which indicate that summer water storage is avail for the crack resistance of upstream fill; according to the simulation calculating result and comparing temperature simulation calculating results and temperature controlling measures of some similarity projects both completed and construction, synthesis appraise have been carried to the design temperature controlling measures of dam, and the temperature controlling measures of this project have been brought forward, all these have great reference value on the design of temperature controlling measures and the optimization of the construction scheme.
本文采用三维有限元浮动网格法仿真计算程序,对某碾压混凝土重力坝的溢流坝段和中孔坝段分别进行了三维有限元温度场和温度徐变应力仿真计算分析,对浇筑温度、冷却水管的布置方式、冷却水温、通水时间、浇筑升程和间歇时间、不同开始浇筑日期等参数进行了敏感性分析,在此基础上提出了推荐的施工方案;根据两种骨料方案(玄武岩粗骨料+灰岩细骨料方案;玄武岩粗骨料+玄武岩细骨料方案)的混凝土性能试验研究成果,对推荐的施工方案进行了温度场和温度徐变应力仿真计算,并对比分析了两种不同骨料情况下的温度场和温度应力,结果表明溢流坝段及中孔坝段采用上述两种骨料均能满足混凝土的抗裂设计要求,且灰岩细骨料优于玄武岩细骨料;计算分析了夏季蓄水和冬季蓄水对坝体温度场和温度应力的影响,夏季蓄水方案与冬季蓄水方案相比,坝体上游变态混凝土区域最大拉应力小0.1~0.3MPa,其他部位最大拉应力无明显变化,夏季蓄水对坝体上游面混凝土的抗裂有利;根据仿真计算成果并通过比较国内一些已建和在建的类似工程的温度仿真计算成果及采取的温控措施,对大坝的设计温控措施进行了综合评价,并提出了该工程的温控措施,对温控设计和优化施工方案具有重要参考价值。
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Randomly adopted 1000 students from 6 country middle schools and 4 country elementary schools, and get 813 available subjects. We can find that: the percentage of Left-behind children is the largest in the whole children, especially Left-behind children who have only one parent; and mentally healthy situations of Left-behind children are poorer than those who are not, the poorest are children who are looked after by compeers or even no rearings; the situations of children who have been Left-behind children also are not so good, there are significant differences mentally healthy between them and those who have not been, while anxiety scores are only a little lower. And there are differences in sex, grade, quarter, single or not and years parents being out among those who are Left-behind children. There are differences of parenting styles among different styles of children caring. Totally speaking, the scores on positive parenting styles of no left-behind children(such as warmth of father and mother) are higher than those who are and who have been left-behind children, but the scores are obviously lower on negative parenting styles such as punishment from father or intervening punishment from mother. The regression equation of anxiety scores on left-behind children set by parenting styles also depends on children caring styles. Positive parenting behaviors of parents and caring people have positive influences on mentally healthy of children, for instance, some supporting and mood warmth., while some negative behaviors such as rejection have negative influences.
随机抽取了江西省的6所农村中学和4所农村小学,调查学生被试共计1000人,有效被试为813人,对调查数据进行分析后发现:留守儿童所占的比重在全体儿童中最大,尤其是单亲看护人的留守儿童;而且,留守儿童的心理健康状况也显著低于非留守儿童,情况最差的是同辈看护或无看护的留守儿童;曾留守儿童的心理状况也不尽如人意,它与非留守儿童的心理健康差异达到了显著水平,心理焦虑总分只是稍低于留守儿童总体;并且,留守儿童的心理健康同样存在着性别、年级、独生与否、住宿与否以及父母打工年数的差异;不同看护类型的留守儿童父母教养方式存在着差异,总的来说,非留守儿童积极性的教养方式(如父亲温暖、母亲温暖等)得分要高于留守儿童和曾留守的儿童,而在很多消极性的教养方式如父亲惩罚、干涉,母亲干涉惩罚等等上,留守儿童与曾留守儿童的得分又要显著高于非留守儿童;家庭教养方式对留守儿童焦虑总分的回归方程视儿童的看护类型而定,父母和看护人的一些积极性的抚养行为对儿童的心理健康有着积极的影响,比如情感温暖或者支持温暖等,但是一些消极的比如拒绝等对留守儿童的心理健康就有负面的影响。
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Leifeng Pagoda was first built in Northern Song Dynasty 977 AD, two years of peace and rejuvenating the country, originally for the King of Wu and Yue Feng Qian-shu Tibetan Buddhism as a relic to pray for peace and prosperity Luo Ji-fat built, the original name of Princess tower, tower of brick-wood structure leifeng well-known high tower, and Chinese folk legend of White Snake widespread myth is closely related to the story in the embodiment of white snake Bai Suzhen have been a result of the pursuit of true feelings and sea monk imprisoned in Leifeng Pagoda, the Leifeng Pagoda and therefore the statement of history far and wide Leifeng Pagoda on the fire hit twice, the first declared in the Northern Song Dynasty and years, because of Fang La uprising, a torch outside the wooden structure burned to the tower to the Southern Song Dynasty years, have been rebuilt Leifeng Pagoda, West Lake, one of Dusk is the leifeng circulated Leifeng Pagoda at that time subjected to fire the second Jiajing in the Ming Dynasty, when the pirates violation of Hangzhou, Leifeng Pagoda burnt again, remaining tower stands on the shore of West Lake, this case continued until the end of the Qing, Leifeng Pagoda finally collapsed due to overwhelming cause of the collapse on the Leifeng Pagoda in history is also very controversial, in general there are two versions of the previous two years in the clean-up sites Leifeng Pagoda time, found that a considerable portion of the tower of brick side of a small hole in the cave there are Buddhist in the past, people have incorrectly relay erroneous messages will pass into a gold brick by brick, the tower blocks have take-home, resulting in the collapse of the tower argument argument, one of the two, due south is the land of plenty since ancient times, but Hangzhou is the House of silk and tea, the history of Hangzhou on the rich silk, and every year when the silkworms cocoon silk, a variety of reasons, tend to have a large number of cocoon death, Over the past superstition, misconception that cocoon cursed, while the Leifeng Pagoda is a town of white snake demon, thinking that would be the Pagoda bricks at home, they can withstand the erosion of Yao Xie, you have to take a sericulture, his family wealth take a course of time, in particular, Taki shaft damage due to the common people, coupled with those in power are indifferent Leifeng Pagoda finally at 13:40 on September 25, 1924 came crashing down
雷峰塔初建于北宋太平兴国二年公元977年,原本为吴越国王钱淑为奉藏佛螺髻发舍利子以祈祷国泰民安所建,原名叫皇妃塔,塔为砖木结构雷峰塔的知名度之高,与中国民间广泛流传的神话传说白蛇传密切相关,故事中白蛇的化身白素贞因追求人间真情而被法海和尚囚禁于雷峰塔下,雷峰塔因而声明远播历史上的雷峰塔曾两次遭遇大火,第一次是在北宋宣和年间,因方腊起义,一把火把外面的木结构塔身加以焚毁到了南宋年间,曾重修雷峰塔,西湖十景之一的雷峰夕照就是在那个时候流传的雷峰塔第二次遭受火烧是在明朝的嘉靖年间,当时倭寇侵犯杭州,雷峰塔再次把火焚,仅剩塔身屹立于西湖之滨这种情形一直持续到清末民初,雷峰塔终因不堪重负而倒塌了关于雷峰塔倒塌的原因,历史上也很有争论,一般来讲有两种说法,前两年在清理雷峰塔遗址的时候,发现有相当一部分的塔砖一侧有一个小洞,在洞里有佛经而在过去,老百姓们以讹传讹将经砖传成金砖,纷纷将塔砖拿回家,从而导致塔的倒塌此说法之一说法之二,由于江南自古就是鱼米之乡,而杭州又是丝茶之府,历史上的杭州就盛产丝绸,而每年蚕宝宝吐丝结茧之时由于多种原因,往往有大量的蚕茧死亡,过去的人迷信,误以为蚕茧中了邪,而雷峰塔是镇妖的白蛇,以为将雷峰塔的砖放在家里,就可以抵挡妖邪的侵蚀,你家养蚕拿一块,他家求财拿一块,久而久之,塔身特别是塔基由于老百姓的破坏,加上当权者的漠不关心,雷峰塔终于在1924年9月25日下午1点40分轰然倒塌
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I have been first, the most wretched of men, and then the most unhappy, and I have traversed sixty years of life on my knees, I have suffered everything that man can suffer, I have grown old without having been young, I have lived without a family, without relatives, without friends, without life, without children, I have left my blood on every stone, on every bramble, on every mile-post, along every wall, I have been gentle, though others have been hard to me, and kind, although others have been malicious, I have become an honest man once more, in spite of everything, I have repented of the evil that I have done and have forgiven the evil that has been done to me, and at the moment when I receive my recompense, at the moment when it is all over, at the moment when I am just touching the goal, at the moment when I have what I desire, it is well, it is good, I have paid, I have earned it, all this is to take flight, all this will vanish, and I shall lose Cosette, and I shall lose my life, my joy, my soul, because it has pleased a great booby to come and lounge at the Luxembourg.
为生活,我用膝头爬了六十年,我受尽了人能受的一切痛苦,我不曾有过青春便已老了,我一辈子没有家,没有父母,没有朋友,没有女人,没有孩子,我把我的血洒在所有的石头上,所有的荆棘上,所有的路碑上,所有的墙边,我向对我刻薄的人低声下气,向虐待我的人讨好,我不顾一切,还是去改邪归正,我为自己所作的恶忏悔,也原谅别人对我所作的恶,而正当我快要得到好报,正当那一切都已结束,正当我快达到目的,正当我快要实现我的心愿时,好,好得很,我付出了代价,我收到了果实,但一切又要完蛋,一切又要落空,我还要丢掉珂赛特,丢掉我的生命、我的欢乐、我的灵魂,因为这使一个到卢森堡公园来游荡的大傻子感到有乐趣!
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Zhu's organization has set up mobile blood centers across Beijing to help to collect 16 liters of Rh-negative blood that he wants to have on standby for the Olympics.
朱瑞权的组织在北京各处建立了流动采血中心,帮助采集他希望为奥运会准备的16升Rh阴性血。
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In eastern Kansu we have on the whole done the same as in Sian .
在陇东,情况和西安大体相同。
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We underestimate how we can manifest and control our own destiny, as well as the effect that we can have on others.
我们低估了展示和掌控自我命运的能力,也低估了自己对他人的影响力。
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This thesis analyzed the possible influences which the great Spanish writer of the Golden Age, Migul de Cervantes, may have on the British novelists between the 18th and 19th centuries, in his novelistic masterpiece known as Don Quixote de la Mancha.
通过仔细阅读研究18、19世纪的英国小说,本题检验了它们体现的《堂吉诃德》影响,每部小说都体现出了对《堂吉诃德》接受的不同侧面,因为每位作家因为身处不同环境不同时代对《堂吉诃德》的理解就各不相同。
- 相关中文对照歌词
- Have A Drink On Me
- Angels We Have Heard On High
- (God Must Have Spent) A Little More Time On You
- A Mighty Fortress / Angels We Have Heard On High
- Angels We Have Heard On High
- Angels We Have Heard On High
- Angels We Have Heard On High
- Angels We Have Heard On High
- Angels We Have Heard On High
- When He Walks On You (Like You Have Walked On Me)
- 推荐网络例句
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We have no common name for a mime of Sophron or Xenarchus and a Socratic Conversation; and we should still be without one even if the imitation in the two instances were in trimeters or elegiacs or some other kind of verse--though it is the way with people to tack on 'poet' to the name of a metre, and talk of elegiac-poets and epic-poets, thinking that they call them poets not by reason of the imitative nature of their work, but indiscriminately by reason of the metre they write in.
索夫农 、森那库斯和苏格拉底式的对话采用的模仿没有一个公共的名称;三音步诗、挽歌体或其他类型的诗的模仿也没有——人们把&诗人&这一名词和格律名称结合到一起,称之为挽歌体诗人或者史诗诗人,他们被称为诗人,似乎只是因为遵守格律写作,而非他们作品的模仿本质。
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The relationship between communicative competence and grammar teaching should be that of the ends and the means.
交际能力和语法的关系应该是目标与途径的关系。
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This is not paper type of business,it's people business,with such huge money involved.
这不是纸上谈兵式的交易,这是人与人的业务,而且涉及金额巨大。