共查询到20条相似文献，搜索用时 62 毫秒
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Sushan Konar 《Resonance》2017,22(6):597-610
A star burns its nuclear fuel and balances gravitation by the pressure of the heated gas, during its active lifetime. After the exhaustion of the nuclear fuel, a low mass starfinds peace as a ‘white dwarf’, where the pressure support against gravitation is provided by Fermi-degenerate electrons. However, for massive stars, the gravitational squeeze becomes so severe that in the final phase of evolution, the average density approximately equals the nuclear density. At such densities, most of the protons combine with electrons to convert themselves into neutrons. A ‘neutron star’, composed of such neutron-rich material, is host to some fascinating physics arising out of its amazingly compact state of matter (where a solar mass is packed inside a sphere of radius ~ 10Km). 相似文献
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NomenclatureV-Relative velocity vectorV′-Absolute velocity vectorω-Relative vorticity vectorω′-Absolute vorticity vectorR-Pipe radiusa-Radius of cylinder for helical vortex filament2πl-Pitch of i mage helical vortex filamentQ-Flowrate in pipe with an arbitrary cross-sectionΓ-Circulation of each helical vortex filamentV0-Constant transferal velocity of vortex filaments along thez-axisΩ-Constant angular velocity of vortex filaments around thez-axis(a,χ1) ,(a,χ2) -Relative helical … 相似文献
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推导出了能谱为ε=∑i=1pi22m+12mi2r2i的n维经典谐振子的态密度,由于处于n维简谐势阱中的粒子可以看作n维谐振子,进而求出了服从玻尔兹曼分布、费米分布、玻色分布的n维简谐势阱中的粒子的状态方程及各热力学函数. 相似文献
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赵彦杰 《廊坊师范学院学报(自然科学版)》2009,9(3):53-54
给出了能谱为ε=αp^s的n维理想费米气体在经典非简并和高温弱简并条件下的化学势、内能、简并压等热力学量的普遍表达式,通过比较分析,得出T趋近于无穷大时,高温弱简并各热力学量过渡到经典非简并的结论。 相似文献
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M. N. Murty 《Resonance》2013,18(7):646-653
The energy levels of a particle in a box are degenerate. The degeneracy of an energy level is reduced or removed on slight distortion in the dimensions of the box without changing its volume. This phenomenon is analogous to the Jahn Teller Effct, which states that in an electronically degenerate state (i.e., more than one degenerate orbital is available for an electron), a nonlinear molecule undergoes distortion to remove the degeneracy by lowering the symmetry and thus lowering the energy. 相似文献
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This paper presents a theory on premix fuel combustion at near isoceles triangle type rate of heat release, describes the
measures taken for the combustion system, points out its many theoretical advantages, and that it can solve effectively the
problems of rough running, fuel consumption and exhaust emission. Two squish lip type combustion chambers are designed to
match separately with multiple holes injector and conical spray type injector in order to achieve premix combustion at near
isosceles triangle type rate of heat release. Experimental studies on two single cylinder diesel engines showed that premix
combustion at isosceles triangle type rate of heat release resulted in longer ignition delay period, larger amount of fuel
injected into cylinder during the ignition delay period, lower maximum pressure, better fuel economy, and better exhaust emission. 相似文献
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ＩＮＴＲＯＤＵＣＴＩＯＮＴｈｅｐｒｅｓｓｕｒｅｇｒａｐｈｇｉｖｅｎｂｙＬｉｎｉｎ 1 960ｏｆｆｏｕｒｔｙｐｅｓｋｉｎｄｓｏｆｒａｔｅｏｆｈｅａｔｒｅｌｅａｓｅｓｈｏｗｅｄｔｈａｔｔｈｅｉｓｏｓｃｅｌｅｓｔｒｉａｎｇｌｅｔｙｐｅｒａｔｅｏｆｈｅａｔｒｅ ｌｅａｓｅｗａｓｉｄｅａｌｏｎｃｏｎｄｉｔｉｏｎｏｆｔｈｅｓａｍｅｍａｘｉ ｍｕｍｐｒｅｓｓｕｒｅ .Ｔｈｅｃｏｎｃｌｕｓｉｏｎｉｓａｌｓｏｒｅａｃｈｅｄｉｎｔｈｅｒｍｏｄｙｎａｍｉｃｓ.Ｉｔｉｓｐｏｐｕｌａｒｌｙａｃｃｅｐｔｅｄｔｈａｔｔｈｅｌａｒｇｅ… 相似文献
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曹峥嵘 《十堰职业技术学院学报》2011,24(4):37-40
文章主要论述了我国星级酒店在快速发展中遇到的问题与对策。强调要统筹规划,使其建设布局合理,规模适当;经营实行差异化战略,充分发挥自身优势;文化彰显无限魅力,形成新的生产要素,确保星级酒店在快速发展中尽快良性运营。 相似文献
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Liquid or gaseous fuel scramjet technology has made great progress, and there has been some research attention to solid-fuel scramjet. A new scramjet configuration using solid fuel as propellant, namely solid-fuel rocket scramjet, is tested experimentally. It consists of two combustors. One is a rocket combustor used as gas generator, and the other is a supersonic combustor used for secondary combustion. The experiment simulates a flight Mach number of 4 at high altitude (stagnation temperature and pressure are 1170 K and 1.16 MPa, respectively), and metalized solid fuel is used as propellant. The results reveal that fuel-rich gas from the gas generator can burn with air in the supersonic combustor. Preliminary evaluation results show that the combustion efficiency of the propellant is about 90%, and the total pressure recovery coefficient in the supersonic combustor is about 0.6. These results indicate that the configuration of solid-fuel rocket scramjet is feasible. 相似文献
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It has been shown that thin-walled hyperelastic tubes could bulge under inflation. In this paper we investigate the possibility of bulging for thin-walled tubes composed of plastoelastic/viscoelastic materials. A general bifurcation condition is derived by near-critical post-bifurcation analysis, which can degenerate into an existing special one for hyperelastic tubes. It is demonstrated that the linearly elastic and plastoelastic tubes can bulge under inflation, but viscoelastic tubes cannot bulge unless the value of inflating pressure is just equal to the one of the critical pressure for the corresponding elastic tubes. 相似文献
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史晨阳 《湖北广播电视大学学报》2010,30(5):59-60
明星访谈类节目是一类以明星为访谈对象的谈话类节目,明星访谈类节目对观众的吸引力源于明星人物在普通大众中的影响力,在一部分明星访谈节目取得成功后,我国出现了明星访谈的热潮,但由于各种原因,导致节目质量良莠不齐,很多明星访谈类节目陷入了发展的困境。要想使明星访谈节目重获发展的活力,就需要在深入剖析当前所面临困境的基础上重新思考节目未来的发展方法和思路。 相似文献
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为减小喷油器容积腔内的压力波动,提高高压共轨喷油器喷射的稳定性,基于系统仿真软件AMEsim建立喷油器模型,分别对普通喷油器和储压喷油器进行仿真计算,并作比较。结果表明,在喷油器进油口处增加储压器能使容积腔内的压力波动明显减小。这可为喷油器的设计与开发提供依据。 相似文献
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胡文燕 《忻州师范学院学报》2012,28(2):3-4
对于拟线性退化抛物方程,很多学者已经对其Cauchy问题的粘性解进行了讨论,但如果考虑的是弱解,将会有不同的处理方法,文章对一类二阶拟线性退化抛物方程的Cauchy问题进行了研究,利用压缩半群理论,证明了其弱解的存在性。 相似文献
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越来越多的商家意识到明星的社会影响力,在其产品或服务中邀请明星担任证明者、推荐者或形象代言人。由于某些利益的驱动,明星在商业广告中,传达虚假信息,甚至欺诈误导消费者的情况已屡见不鲜,由此引发的潜在社会危害性不可低估,众多消费者因明星效应而屡屡上当受骗,司法实践中也曾出现状告明星的现象,但明星对此是否应承担法律责任,承担怎样的法律责任,该问题还未引起法学界足够的关注。本文在对明星虚假广告的法律性质分析的基础上,通过对明星虚假广告有悖诚信原则、属于共同欺诈、构成侵权等相关问题的探讨,以期引起法学界的重视和深入研究。 相似文献