Light screen velocity measuring method with unique advantages has been widely used in the velocity measurement of various moving bodies.For large air resistance and friction force which the big moving bodies are subje...Light screen velocity measuring method with unique advantages has been widely used in the velocity measurement of various moving bodies.For large air resistance and friction force which the big moving bodies are subjected to during the light screen velocity measuring,the principle of velocity correction was proposed and a velocity correction equation was derived.A light screen velocity measuring method was used to measure the velocity of big moving bodies which have complex velocity attenuation,and the better results were gained in practical tests.The measuring uncertainty after the velocity correction was calculated.展开更多
A nonlinear mathematic model taking the nutation and precession angles as variables for the coning motion of projectile was established according to a short period moment projection of the spining projectile. By intro...A nonlinear mathematic model taking the nutation and precession angles as variables for the coning motion of projectile was established according to a short period moment projection of the spining projectile. By introducing the generalized nutation angle and precession angular speed, the model that is difficult to be resolved can be transformed to a resolvable one. The interrelationship between nutation and precession was analyzed based on the linear model, and the stability condition was obtained for the spinning projectile. For the nonlinear model, the effects of the nutation and precession on the limit circle of the projectile's coning motion were investigated, and the analytical relations between the nutation angle and the precession angular speed in the steady coning motion of the spinning projectile were given.展开更多
科学的焦炭评价指标有利于焦炭的原料成本控制以及炼焦煤资源的更合理利用,即焦炭在高炉中的性能评价对于冶炼效率、产量和产品质量至关重要。为了解和统计焦炭在高炉中性能评价领域在1994—2023年的研究方向、热点以及研究进展,以中国...科学的焦炭评价指标有利于焦炭的原料成本控制以及炼焦煤资源的更合理利用,即焦炭在高炉中的性能评价对于冶炼效率、产量和产品质量至关重要。为了解和统计焦炭在高炉中性能评价领域在1994—2023年的研究方向、热点以及研究进展,以中国知网(CNKI)和Web of Science(WOS)的相关文章为研究材料,运用文献计量分析法对1994—2023年焦炭在高炉中性能评价领域的论文数量、研究学科、研究机构及作者、关键词、研究内容趋势与前沿热点进行分析。研究通过CiteSpace软件绘制焦炭在高炉中性能评价领域的关键词图谱、关键词时间轴图谱以及关键词突现图谱,并利用office软件对相关数据进行分析。结果表明:焦炭在高炉中性能评价领域国内发文量从1994年开始经历了快速上升、动态平衡、稳步上升3个时期,国外发文量在1994—2009年之间发文量为0,从2010年起经历了爆发式增加、稳步上升2个时期;同时焦炭在高炉中性能评价领域的文章涉及多个研究学科,体现了多学科交叉的特点;焦炭在高炉中性能评价研究领域伴随着环境保护重视程度的加重,国内侧重于关注焦炭热性能、光学组织、炼焦煤、微观结构等方面,国外侧重于焦炭在高炉中的反应行为、CO_(2)捕获等方面。因此加强基础研究、技术创新以及多学科交叉互融的全要素格局对提高焦炭在高炉中性能评价的科学性及其应用具有重要的作用,有助于推动冶金工业朝着更加高效、环保和可持续的方向发展。展开更多
Traditional intercept probability model has some drawbacks and can not meet the demands of command and control system. Aiming at this problem, a new calculation method based on search theory, terminal control area dis...Traditional intercept probability model has some drawbacks and can not meet the demands of command and control system. Aiming at this problem, a new calculation method based on search theory, terminal control area distribution function of anti-ship missile, target distribution function and missile's radar scan feature is proposed. Under the condition of common target distribution, an intercept probability model for present point attacking is determined. The simulation verifies its effectiveness and establishes the selecting model for aiming point when enemy ships evade in high speed.展开更多
Erosive burning is a common burning phenomenon of the gunpowder with inner holes.The actual combustion law of the gunpowder with inner holes can be changed by erosive burning.Pressure difference between the inner and ...Erosive burning is a common burning phenomenon of the gunpowder with inner holes.The actual combustion law of the gunpowder with inner holes can be changed by erosive burning.Pressure difference between the inner and the outer of hole caused by loading density variation of the propellant charge makes erosive burning occur at inner holes during in-bore burning.The effect of erosive burning on burning speed of the propellant is studied by using the effects of flow rate,heat transfer and erosion of the combustion gas in inner holes on burning rate.The mathematic model of erosive burning of the propellant is established.The effects of the factors such as loading density,inner hole size and grain length on erosive burning and interior ballistic performance are analyzed.The method to improve the bore pressure for small charge mass and small firing range by erosive burning is proposed.展开更多
为了解谢苗诺夫热爆炸开创性研究论文在科学领域的知识扩散情况,从Web of Science数据库中采集了317篇引用谢苗诺夫(1928)的论文,并分别对该论文的时间和空间扩散、作者层面的扩散、主题层面的扩散及与关联文献的协同扩散进行了分析。...为了解谢苗诺夫热爆炸开创性研究论文在科学领域的知识扩散情况,从Web of Science数据库中采集了317篇引用谢苗诺夫(1928)的论文,并分别对该论文的时间和空间扩散、作者层面的扩散、主题层面的扩散及与关联文献的协同扩散进行了分析。结果表明,在过去90多年中,谢苗诺夫的热爆炸开创性论文受到了持续的引用扩散,并扩散到了美国、以色列、英国、中国及德国等37个国家或地区和以色列内盖夫本-古里安大学、英国利兹大学、中国台湾云林科技大学、俄罗斯科学院及北京理工大学等187个研究机构。该论文的主要引用者包含Gol'dshtein Vladimir、Gray P、Boddington T、Goldfarb I及Zinoviev A等一批热爆炸研究学者。谢苗诺夫(1928)扩散到论文的主题与热爆炸关系密切,包含积分流形、燃烧、差示扫描量热法、失控反应及自热等热爆炸研究主题及研究方法。其中,近期主要扩散到的主题有热失控、锂电池及差示扫描量热法等。谢苗诺夫(1928)与关联文献的协同扩散展示了知识扩散的知识基础及其各个时期的演化情况,揭示了热爆炸从早期理论探索到近期实践研究的历程。展开更多
文摘Light screen velocity measuring method with unique advantages has been widely used in the velocity measurement of various moving bodies.For large air resistance and friction force which the big moving bodies are subjected to during the light screen velocity measuring,the principle of velocity correction was proposed and a velocity correction equation was derived.A light screen velocity measuring method was used to measure the velocity of big moving bodies which have complex velocity attenuation,and the better results were gained in practical tests.The measuring uncertainty after the velocity correction was calculated.
基金Sponsored by the National Science Foundation of China (10972034)
文摘A nonlinear mathematic model taking the nutation and precession angles as variables for the coning motion of projectile was established according to a short period moment projection of the spining projectile. By introducing the generalized nutation angle and precession angular speed, the model that is difficult to be resolved can be transformed to a resolvable one. The interrelationship between nutation and precession was analyzed based on the linear model, and the stability condition was obtained for the spinning projectile. For the nonlinear model, the effects of the nutation and precession on the limit circle of the projectile's coning motion were investigated, and the analytical relations between the nutation angle and the precession angular speed in the steady coning motion of the spinning projectile were given.
文摘科学的焦炭评价指标有利于焦炭的原料成本控制以及炼焦煤资源的更合理利用,即焦炭在高炉中的性能评价对于冶炼效率、产量和产品质量至关重要。为了解和统计焦炭在高炉中性能评价领域在1994—2023年的研究方向、热点以及研究进展,以中国知网(CNKI)和Web of Science(WOS)的相关文章为研究材料,运用文献计量分析法对1994—2023年焦炭在高炉中性能评价领域的论文数量、研究学科、研究机构及作者、关键词、研究内容趋势与前沿热点进行分析。研究通过CiteSpace软件绘制焦炭在高炉中性能评价领域的关键词图谱、关键词时间轴图谱以及关键词突现图谱,并利用office软件对相关数据进行分析。结果表明:焦炭在高炉中性能评价领域国内发文量从1994年开始经历了快速上升、动态平衡、稳步上升3个时期,国外发文量在1994—2009年之间发文量为0,从2010年起经历了爆发式增加、稳步上升2个时期;同时焦炭在高炉中性能评价领域的文章涉及多个研究学科,体现了多学科交叉的特点;焦炭在高炉中性能评价研究领域伴随着环境保护重视程度的加重,国内侧重于关注焦炭热性能、光学组织、炼焦煤、微观结构等方面,国外侧重于焦炭在高炉中的反应行为、CO_(2)捕获等方面。因此加强基础研究、技术创新以及多学科交叉互融的全要素格局对提高焦炭在高炉中性能评价的科学性及其应用具有重要的作用,有助于推动冶金工业朝着更加高效、环保和可持续的方向发展。
文摘Traditional intercept probability model has some drawbacks and can not meet the demands of command and control system. Aiming at this problem, a new calculation method based on search theory, terminal control area distribution function of anti-ship missile, target distribution function and missile's radar scan feature is proposed. Under the condition of common target distribution, an intercept probability model for present point attacking is determined. The simulation verifies its effectiveness and establishes the selecting model for aiming point when enemy ships evade in high speed.
文摘Erosive burning is a common burning phenomenon of the gunpowder with inner holes.The actual combustion law of the gunpowder with inner holes can be changed by erosive burning.Pressure difference between the inner and the outer of hole caused by loading density variation of the propellant charge makes erosive burning occur at inner holes during in-bore burning.The effect of erosive burning on burning speed of the propellant is studied by using the effects of flow rate,heat transfer and erosion of the combustion gas in inner holes on burning rate.The mathematic model of erosive burning of the propellant is established.The effects of the factors such as loading density,inner hole size and grain length on erosive burning and interior ballistic performance are analyzed.The method to improve the bore pressure for small charge mass and small firing range by erosive burning is proposed.
