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Search Results: 1 - 10 of 304185 matches for " 刘文胜 "
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柴油机过量空气系数的防熄火要求
Requirements for the Excess Air Coefficient to Avoid Flameout in Diesel Engine
 [PDF]

, 金良安, 高占
Journal of Security and Safety Technology (JSST) , 2015, DOI: 10.12677/JSST.2015.31001
Abstract:
柴油机这一当前应用最广泛的重要动力装置,往往由于过量空气系数降低而影响动力性能甚至直接熄火。本文根据柴油机过量空气系数与其平均有效压力、排气平均温度等主要参数的关系,基于缸内燃料燃烧过程的热力学计算,对柴油机过量空气系数的防熄火要求进行分析,给出了柴油机防熄火的临界过量空气系数理论值求解方法,从而在理论上进一步阐述了随着过量空气系数的降低,柴油机的动力性降低、热负荷增加、燃烧质量下降的现象;特别是当过量空气系数低于临界值时,柴油机会熄火,无法维持正常工作。所得结论对柴油机理论与应用的深入研究,提高其在各种不同条件下工作的可靠性具有实际意义。
As the most widely used and important power plant at present, due to the decrease of excess air coefficient (EAC), the dynamic performance of diesel engine often receives great influence even direct flameout. According to the relationship between EAC and main parameters such as mean effective pressure and mean exhaust temperature, based on the thermodynamic calculation about fuel combustion process in cylinder, this paper analyses the requirements for the EAC to avoid flameout in diesel engine and provides the method of calculating the critical EAC, and thus we can give further elaboration to the phenomenon that with the loss of EAC, the power performance re-duces, the thermal load increases and the combustion quality reduces in theory; especially when EAC is less than the critical value, the diesel engine will face flameout and can’t maintain normal work. The conclusion has practical significance to the further study of diesel engine theory and application, the reliability increase under all kinds of different conditions.
Grads在海浪大数据处理中的优势
The Advantage of Grads Software in Dealing with the Wave Big Data
 [PDF]

高占, 田妍妍, 陈璇,
Adances in Marine Sciences (AMS) , 2016, DOI: 10.12677/AMS.2016.32004
Abstract:
在信息爆炸的大数据时代,选择高效的应用工具,是从大数据中获取有用信息的重要保证。本文在此利用Grads (Grid Analysis and Display System)软件对海洋数据进行处理、绘图,同时利用其他软件进行对比,发现Grads程序更适合应用于海洋大数据处理,理由如下:1) Grads程序简洁、不易出错,程序简短。2) Grads处理效率明显高于其与软件。还利用Grads软件进行滑动平均、求线性变化趋势、求相关系数、结合Fortran程序统计频率、以及一些常用函数的计算,发现该软件在这些方面都具有非常强大、高效的运算能力、显示能力。在未来的工作中,还可以尝试着将Grads软件应用于海浪以外的其与数据,为海洋建设做贡献。
In the big data times of information explosion, the selection of efficiency software is to get the im-portant guarantee of useful information from big data. In this paper, we use Grads (Grid Analysis and Display System) software to handle and draw the big marine data, at the same time using other software to compare with Grads. The results show that Grads program is more suitable in marine data handling, with following reasons: 1) Grads program is succinct, hardly to make mistakes; 2) Grads has advantages in handling efficiency over other software obviously. In addition, based on Grads, by calculating the moving average, linear trend, correlation coefficient, statistical frequency combined with Fortran program and some common used functions, we found that Grads had advantages in these aspects with higher efficient calculating capability and graphic display ability. In future, we can make contributions for oceanic development by using Grads for other data not in ocean wave field.
吉兰泰盐湖区域地质特征及其形成演化的遥感解译
兴起,
海洋与湖沼 , 2002,
Abstract: 采用吉兰泰盐湖地区TM数据进行标准假彩色图像处理,对研究区构造、地貌、水系分布等地质特征进行解译和分析,探讨了吉兰泰盐湖的形成演化过程和盐湖形成的水体来源。结果表明,研究区贺兰山隆起带、吉兰泰沉降带、巴音乌拉山隆起带所组成的北北东向右行多字型斜列的基本构造格局,不仅控制着吉兰泰盐湖古湖盆的演化,而且控制着吉兰泰盐湖形成的水体来源。
大型多钩槽绦虫在黄鳝体内寄生的研究
方建平,
动物学杂志 , 1999,
Abstract:
紫花针茅生殖器官形态的变异及其与环境因子的关系
,齐丹卉
草业科学 , 2015, DOI: 10.11829\j.issn.1001-0629.2014-0426
Abstract: ?紫花针茅(Stipapurpurea)是青藏高原分布面积最广的植物之一,对高原环境具有广泛的适应性。该植物具有的锥形繁殖体(包括种子和附属结构),是其适应环境的主要特征之一。为揭示该植物对高原环境的适应性表现,本研究对不同纬度的20个紫花针茅种群繁殖体的形态特征及其与环境的关系进行比较研究。结果表明,1)种长的变化幅度为0.692~1.255cm,种宽的变化幅度为0.392~0.713mm,芒长的变化幅度为2.394~8.736cm,种子重的变化幅度为0.678~1.560mg。芒长和种子重具有较高的种群间变异系数。种子重与种长呈极显著正相关关系(P<0.01),和芒长呈显著正相关关系(P<0.05);种长、种宽、芒长相互之间均呈极显著正相关关系。2)种长、种子重与等效纬度均呈显著正相关关系,与年均降水量均呈显著负相关关系;种长与年均温呈现出凸型变异的关系。3)20个种群依据繁殖体特征进行聚类分析可分为3组,聚类结果与地理分布基本一致。
上海浦东机场T2航站楼结构模型模拟地震振动台试验研究
吕西林,,
地震工程与工程振动 , 2009,
Abstract: 上海浦东机场T2航站楼为下部钢筋混凝土框架、上部钢屋盖,两者通过Y形钢斜柱联接而成的大跨度空间混合结构,建筑造型新颖,结构形式复杂。为研究它在地震作用下的抗震性能,进行了135缩尺的模型结构振动台试验。本文详细介绍了航站楼结构体系、模型材料的选取、动力相似关系的确定以及试验方案的设计,并通过对试验现象和数据结果处理分析,考察了结构的动力特性,以及加速度、位移和应变反应。试验结果表明,组成此混合结构的框架结构、钢斜柱和钢屋盖在地震反应上各具特点,差异较大。该结构体系合理,具有足够的抗侧刚度,能够满足"小震不坏"、"大震不倒"的抗震设防要求。
试论中国共产党作为“三个先锋队”的统一
李达龙,周代怀,
天府新论 , 2005,
Abstract: 中国共产党从“两个先锋队”的统一向“三个先锋队”统一的转变,是在改革开放新的历史时期党的先进性的延伸、拓展和发展,它是由中国共产党所处的历史地位,党所肩负的历史重任的转变的要求,在新的历史条件下实现社会主义本质和党的最高纲领的需要,是解决党的建设所面临的两大历史性课题的必然结果。
卡那霉素叶片涂抹法筛选转基因大豆植株的有效性
斌?,吴 迪?,
西北农林科技大学学报(自然科学版) , 2006,
Abstract: 以吉林小粒1号大豆为材料进行卡那霉素梯度涂抹试验,确定卡那霉素筛选的最佳浓度和筛选临界观察时间,并在此基础上,对转基因大豆植株(含nptⅱ基因)分离后代进行卡那霉素涂抹检测和pcr检测,检验2种方法的符合度。结果表明,卡那霉素的最佳筛选浓度为500mg/l,观察时间以3d为宜;抗和高抗卡那霉素植株2种检测方法的符合度为90.8%,感和高感卡那霉素植株的符合度为87.1%。可见,卡那霉素叶片涂抹法完全可以用于大豆转基因植株的快速筛选。
HS油田注水系统腐蚀原因分析
Analysis of Corrosion Factors in HS Oilfield Injection System
 [PDF]

耀, 丽丽, 李媛, , 于元英, 欧阳诗昆, 李克华
Advances in Energy and Power Engineering (AEPE) , 2015, DOI: 10.12677/AEPE.2015.35017
Abstract:
HS油田注水系统腐蚀严重,结合注水系统的水质,分析了腐蚀原因:矿化度和温度是影响注水系统腐蚀主要因素,除此之外,清水系统的4个站点的细菌含量以及采出水的SRB、硫化物含量均是影响腐蚀速率的重要因素。
HS oilfield water injection system is corroded severely. Combined with the water quality of HS oilfield water injection system, the reasons of corrosion are as follows. Salinity and temperature are important factors affecting the corrosion rate, and in addition, the bacteria content of four sites in fresh water system, the content of SRB and sulphide of produced water are also important factors affecting the corrosion rate.
氨基硫脲在盐酸中对碳钢的缓蚀性能研究
Inhibition Performance of Thiosemicarbazide on Carbon Steel in Hydrochloric Acid
 [PDF]

李媛, 丽丽, 于元英, ,耀, 李克华
Advances in Energy and Power Engineering (AEPE) , 2015, DOI: 10.12677/AEPE.2015.35023
Abstract:
采用失重法和电化学极化法研究了氨基硫脲在盐酸清洗剂中对碳钢的缓蚀行为,并初步探讨其吸附性能。结果表明:氨基硫脲属于混合型缓蚀剂,在盐酸介质中缓蚀作用良好,20℃下氨基硫脲为30 mg/L时,其缓蚀效率可达93.3%。氨基硫脲的缓蚀效率受温度的影响较大,其在碳钢表面的吸附符合Langmuir吸附规律。
The corrosion inhibition behavior of thiosemicarbazide for carbon steel in a hydrochloric acid so-lution was studied by weight loss and electrochemistry polarization method, and the absorbance of thiosemicarbazide on carbon steel was preliminary discussed. The results showed that thiose-micarbazide, as a complex inhibitor, gave nice inhibition efficiency on carbon steel in hydrochloric acid medium. The inhibition efficiency of thiosemicarbazide was up to 93.3% when the thiosemi-carbazide reached 30 mg/L at room temperature. The inhibition performance of thiosemicarbazide is affected by temperature, and its absorbance behaviors can be expressed by the equation of Langmuir model.
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