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The characteristic of fuel consumption at aero-engine afterburning condition was analyzed.Based on the fact that the efficiency of main combustor is higher than that of the afterburner,this article puts minimum fuel consumption mode into use at aero-engine afterburning condition.
分析了发动机加力状态燃油消耗的特点,利用主燃烧室燃烧效率远大于加力燃烧室燃烧效率的特点,将性能寻优控制中的最小油耗模式扩展至加力状态。
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The characteristic of fuel consumption at aero-engine afterburning condition was analyzed. Based on the fact that the efficiency of main combustor is higher than that of the afterburner, this article puts minimum fuel consumption mode into use at aero-engine afterburning condition.
分析了发动机加力状態燃油消耗的特点,利用主燃烧室燃烧效率远大於加力燃烧室燃烧效率的特点,將性能寻优控制中的最小油耗模式扩展至加力状態。
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This study analysised the condition of Xinjiang's petroleum resource and made an evaluation and it points out that the development of petroleum and natural gas of Xinjiang is still in the developing period in which it aims at discovering the petrol field and increasing its reserves.Although it has a great exploring potential,because of its geograghy limitation and a lack of exploring funds,the exploring level is till low,even lower than the everage level of the whole country. The study is based on theories of industry distributions,its concentration,macroscopic analysis,government regulations and continuing development.From microcosmic and macroscopic aspects,it scientifically and systematically analyses the problems in the development of petroleum industry in Xinjiang.It points that the developments of middle and upper reaches lack a balance and have no rational industry structures.So it is hard to form an integral industry chains.Moreover,the upper reach covers a too much large proportion in the development,so it can not give a strong impetus to other industries.Based it,the paper points the industrial concentration of Petroleum Chemical Products Manufacture of Xinjiang should be enhanced and Input to Petroleum Chemical Products Manufacture of Xinjiang should be increased.Due to a lack of an established fair and competitive market and government's perfect laws and regulations on petroleum industry,it points that the phenomenon of mixed operation has become common in monolopied business and competitive business,so the systems of petroleum industry needs to be restructured.It states clearly that the country should take the development and benefits of Xinjiang's economy into consideration when making strategies for petroleum development .Besides,the allocation of profits between the center and the local should be well arranged so that we can guarantee the profits of Xinjiang ,considered as a resource area.It also reveals that we should not only overcome limitations of resources,environment,economy and technology on continuring development,but also we should deal with some realistic problems well.For instance,contradictions between the concept of limited resource and continuing development,the relationship between petroleum industry's own features and continuing development,the contradictions between the limits on supply of petroleum and the need of future development of continuing resource ,outdated petroleum technology and the need of advanced technology for continuing development,tremendous damages to environment and requirements of environment protection for continuing development and Xinjiang continuing economic development,outdated policy of industry and continuing development,the relationship between continuing development of Xinjiang petroleum industry and continuing economic development of Xinjiang.
本研究以产业布局理论、产业集中度理论、灰关联分析理论、政府规制理论、可持续发展理论为依据,从微观、宏观两个层面,科学、系统、全面地分析新疆石油产业的发展问题,指出:新疆石油天然气目前仍处于油气田发现和增储的主要发展阶段,开发潜力巨大,但由于地质原因及勘探投入的不足,石油天然气探明程度偏低,低于全国平均水平;新疆石油产业产业结构布局不合理、上中下游发展不平衡,难以形成完整的产业链条,对工业的带动力与其本身具有的经济总量很不匹配;新疆石油开采业和石油加工业属于高度寡头垄断的市场类型,新疆石油化工业属于竞争型的市场结构,要想石油产业对新疆经济有较强的带动作用,新疆石油化工业必须上升到一定的层次和规模,在提高规模的基础上,提高新疆化工业的产业集中度;新疆石油加工业和化工业与农业呈现较高的关联度,加大对石油加工业和化工业的投入,对新疆经济的协调发展有着深远的影响;政府要从石油产业本质特征和发展趋势为着眼点,实施规制改革,分开政府规制政策的制定部门和监管部门职能,建立健全石油产业法律法规体系,对垄断性业务和竞争性业务实施分类规制;国家石油发展战略的制定应兼顾新疆区域经济的发展和利益,应切实处理好新疆与中央的利益分配,切实保证新疆作为资源产区合理的资源收益;新疆石油产业要想得以可持续发展,不仅要克服影响可持续发展的资源、环境、经济和技术等客观因素,还要处理好观念、需求、政策等诸多主观因素。
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After that, the author investigated the current condition of the feeding of the old peasants from two aspects: 1 the domestic condition of the aged peasants and the changes from generation to generation; 2 the essential condition of the aged peasants and their degrees of approbation on the issue of the current endowment insurance.
然后从两个方面对我国老年农民养老的现状展开了实证调查:一是农民老人的家庭状况及代际变化情况;二是老年农民的个人情况及对目前养老保险的认可程度。
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Firstly, the soil samples are gathered from the same section such as surface layer soil samples gathered from 0cm to 15cm depth and representation on studied object. Secondly, the precondition of tested samples must be the same. This study indicates that the tested samples must be 1mm diameter, over-dried at 40℃ for 24h and airtight cooling for 24h before measured for air-dry samples, and softly planish the surface at measuring. Lastly, the illuminating condition of light must be the same. This study indicates that the testing geometric condition are light source angle 15°, light source distance 30cm and sensor distance 15cm for soil hyperspectra indoor. The surface of white reference must be the same plane of that of sample.
第一个环节的"相同"是指田间土壤样品采集时的剖面位置一致,如表层土都采集0~15cm深度范围内的土壤,且所采集的样品应能尽量具备研究对象的代表性;第二个环节的"相同"是指土壤制备过程中的一些前处理条件应一致,建议土壤光谱测试样品的粒径1mm,风干土壤样品测试前在40℃恒温条件下烘24小时,然后密闭冷却24小时,测试时土壤表面进行稍稍压平处理;第三个环节的"相同"是保证测试光照条件的一致性,建议在50W卤素灯、8°探头角条件下,采用15°的光源照角度、30cm的光源距离和15cm作为室内士壤高光谱测试几何条件,测试时除遵循光谱测试指南的要求外,还须保证参考板表面与测试土壤样品的表面在同一平面上。
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It is found that the validity of modal series method and linear modal method is not influenced by the second-order resonance condition, which has a great influence on normal form method. When the operating condition is near the second-order resonance condition, the valid area of normal form method is quite small.
发现模态级数法和线性模式分析法的有效性均不受系统共振的影响,而正规形法的有效性受系统共振情况的影响较大,在系统的2阶共振点附近,其有效域面积较小。
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The fourth part, based on the comparison to the four big cities of northeast, analyzes the actual development condition and the status of Changchun; Using the quantitative analysis method, carries on the whole appraisal of the Changchun industrial development situation as well as the connectional development situations with other industries; According the actual development condition, discussed that the Changchun's new-type industrial system should be prioritize develop several industries and the mentality of their construction and development; Proposed several suggestions to carries on the macro economical regulation and control to the Changchun's new-type industrial system.
第四部分,在对东北地区四大中心城市进行比较的基础上,分析长春市的实际发展状况和地位;利用定量分析的方法,对长春市的工业发展情况以及与其它产业关联发展的情况进行整体评价;根据实际发展状况,探讨了长春市新型工业体系应重点发展的几大系统以及它们的建设和发展思路;提出了对长春市新型工业体系进行宏观调控的几点建议。
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By the numerical analysis of the ultimate bearing capacity of two- and three-dimensional footing under combined loading mode, the results show that the effect of alteration of underground water lever on bearing capacity of three-dimensional foundation is more than on that of two-dimensional foundation, the effect of soil gravity on bearing capacity of three-dimensional foundation is more than that of two-dimensional foundation. At the same time, the numerical calculation process of ABAQUS indicates that whether the geostatic stress is balanced or not has great effect on the numerical convergence. In view of the effect extent of dilation angle of soil on the ultimate bearing capacity and the failure pattern of foundation, the condition of two-dimensional plane strain is higher than that of the three-dimensional foundation.
复合加载模式下,通过对三维矩形基础和二维条形基础进行数值分析,结果表明:黏性土地基中地下水位的变化,对三维矩形基础极限承载力的影响程度高于对二维条形基础的影响;在求解地基极限承载力的过程中,土体重度对三维矩形基础的影响明显高于对二维条形基础的影响,同时ABAQUS数值计算过程表明,地基土体地应力能否合理平衡,对数值求解过程中是否收敛有很大的影响;就土体剪胀角对地基极限承载力的影响程度而言,二维平面应变情况下土体剪胀角对极限承载力的影响比三维情况下的影响更明显,即土体剪胀角对条形基础极限承载力的影响高于三维矩形基础。
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But in practical operating, overvoltage caused by reignition of the vacuum switching device frequently appears, and it result in damage of the capacitor bank or the switchgear itself. Ensuring the switchgear against reignition and installing a protective device are two main approaches to avoid the phenomenon. In this paper, a study on overvoltage caused by reignition due to capacitor bank switching with the vacuum switching device and its preventive measures are carried out. The main work which has been done and researches are as follows: 1. The producing mechanism of overvoltage and its influence factor are analyzed. It is pointed out that single-phase reignition is the main reason for damage of the switchgear and two-phase reignition is the main reason for damage of the capacitor bank,so overvoltage of single-phase reignition and two-phase reignition are the emphases of prevention. 2. Analysis of the special working condition of the operating switch for capacitor bank is carried out. It indicates that the vacuum switching device is difficult to realize no-reignition under this operation condition, so it is more practical to adopt protection devices. 3. Analyses of protection effect of RC and MOA and their shortages are carried out. It shows that the two methods can only restrain effectively overvoltage caused by single-phase reignition, and they cannot protect the capacitor bank when reignition of two-phase occurs. 4. The operation principle of G-R damping device is analyzed and discussed emphatically.
本文针对真空开关投切电容器组时因重燃而产生的过电压及其防治措施进行了研究,所开展的主要工作和研究结果如下: 1、对过电压的产生机理及其影响因素进行了分析,指出单相重燃是导致开关设备损坏的主要原因,而两相重燃则是导致电容器组损坏的主要原因,因此单相重燃和两相重燃过电压是防护的重点; 2、对电容器组操作开关的特殊运行条件进行了分析,指出在这种运行条件真空开关难于实现不重燃,因此采用保护装置更具有现实意义; 3、对RC与MOA的保护效果和存在的不足进行了分析,指出这两种方法均只能有效抑制单相重燃过电压,而不能在发生两相重燃时保护电容器组; 4、重点对G-R阻尼装置的工作原理进行了分析和讨论,指出该装置接入后线路中将会出现两种频率的高频振荡,而电容器组上的过电压是由这两种振荡共同决定的; 5、根据对上述两种振荡的分析指出存在一个最佳电阻值使得过电压最低,并提出了电容器组电压和最佳电阻值的近似求解方法; 6、使用电气暂态分析软件MATLAB对G-R装置的保护效果进行了仿真计算,证实该装置确实可以有效抑制重燃时的电容器组过电压; 7、根据仿真与近似计算结果的偏差提出了近似计算的修正方法,经过修正后的过电压计算结果与仿真结果吻合较好; 8、对G-R装置中放电装置G与阻尼电阻R的要求进行了分析,指出采用编织电阻和真空间隙可能是最佳选择。
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The birth and the development of concept of talents that is people oriented are inevitable. The historical development of talents concept depends on the different kinds of value pursuance of human development. Concept of talents of apotheosized morality which under the condition of natural economy in accent times, concept of talents of materialized intellectual which is under the condition of commodity economy in modern society, concept of talents of humanized free personality under the condition of product economy in the future society.
人的发展的不同形态的价值追求决定了人才观念演进的历史逻辑:古代自然经济形态下&神化&的&德性&人才观,现代商品经济社会形态下&物化&的&知性&人才观,未来产品经济社会形态下&人化&的&个性&的人才观。
- 推荐网络例句
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This brought fixed cost, but it also is meant at the same time use a source to won't make you singlehanded assume a problem.
这带来了一定的成本,但它同时也意味着使用开源不会让你独力承担问题。
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He gained a small fortune in real estate.
他在房地产上发了一笔小财。
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Well I do not accept second-place for the United States of America.
我不接受美国坐在世界第二的位置上。