Here, using the Scale-Symmetric Theory (SST) we explain the cosmological tension and the origin of the largest cosmic structures. We show that a change in value of strong coupling constant for cold baryonic matter lea...Here, using the Scale-Symmetric Theory (SST) we explain the cosmological tension and the origin of the largest cosmic structures. We show that a change in value of strong coupling constant for cold baryonic matter leads to the disagreement in the galaxy clustering amplitude, quantified by the parameter S8. Within the same model we described the Hubble tension. We described also the mechanism that transforms the gravitational collapse into an explosion—it concerns the dynamics of virtual fields that lead to dark energy. Our calculations concern the Type Ia supernovae and the core-collapse supernovae. We calculated the quantized masses of the progenitors of supernovae, emitted total energy during explosion, and we calculated how much of the released energy was transferred to neutrinos. Value of the speed of sound in the strongly interacting matter measured at the LHC confirms that presented here model is correct. Our calculations show that the Universe is cyclic.展开更多
Several parameters of a commercial Si-based Schottky barrier diode (SBD) with unknown metal material and semiconductor-type have been investigated in this work from dark forward and reverse I-V characteristics in the ...Several parameters of a commercial Si-based Schottky barrier diode (SBD) with unknown metal material and semiconductor-type have been investigated in this work from dark forward and reverse I-V characteristics in the temperature (T) range of [274.5 K - 366.5 K]. Those parameters include the reverse saturation current (I<sub>s</sub>), the ideality factor (n), the series and the shunt resistances (R<sub>s</sub> and R<sub>sh</sub>), the effective and the zero bias barrier heights (Φ<sub>B</sub> and Φ<sub>B0</sub>), the product of the electrical active area (A) and the effective Richardson constant (A**), the built-in potential (V<sub>bi</sub>), together with the semiconductor doping concentration (N<sub>A</sub> or N<sub>D</sub>). Some of them have been extracted by using two or three different methods. The main features of each approach have been clearly stated. From one parameter to another, results have been discussed in terms of structure performance, comparison on one another when extracted from different methods, accordance or discordance with data from other works, and parameter’s temperature or voltage dependence. A comparison of results on Φ<sub>B</sub>, ΦB0</sub>, n and N<sub>A</sub> or N<sub>D</sub> parameters with some available data in literature for the same parameters, has especially led to clear propositions on the identity of the analyzed SBD’s metal and semiconductor-type.展开更多
Intelligent structures like zero Poisson’s ratio(ZPR)cellular structures have been widely applied to the engineering fields such as morphing wings in recent decades,owing to their outstanding characteristics includin...Intelligent structures like zero Poisson’s ratio(ZPR)cellular structures have been widely applied to the engineering fields such as morphing wings in recent decades,owing to their outstanding characteristics including light weight and low effective modulus. In-plane and out-of-plane mechanical properties of ZPR cellular structures are investigated in this paper. A theoretical method for calculating in-plane tensile modulus,in-plane shear modulus and out-of-plane bending modulus of ZPR cellular structures is proposed,and the impacts of the unit cell geometrical configurations on in-plane tensile modulus,in-plane shear modulus and out-of-plane bending modulus are studied systematically based on finite element(FE)simulation. Experimental tests validate the feasibility and effectiveness of the theoretical and FE analysis. And the results show that the in-plane and out-of-plane mechanical properties of ZPR cellular structures can be manipulated by designing cell geometrical parameters.展开更多
描述了一种S波段简易压控振荡器(VCO)的设计。该设计基于负阻原理,利用微波有源器件的小信号S参数,采用低噪声晶体管和变容二极管作为核心器件降低振荡器的相位噪声。适当的匹配补偿电路有效地改善了VCO的调频(FM)线性度,同时,有效地抑...描述了一种S波段简易压控振荡器(VCO)的设计。该设计基于负阻原理,利用微波有源器件的小信号S参数,采用低噪声晶体管和变容二极管作为核心器件降低振荡器的相位噪声。适当的匹配补偿电路有效地改善了VCO的调频(FM)线性度,同时,有效地抑制了谐波分量。实际电路测试结果表明:该VCO的中心频率为3.09 GHz,输出功率为10.9 d Bm,调谐范围大于200 MHz,FM线性度优于3%,功率平坦度良好,相位噪声达到了-104.5 d Bc/Hz@100 k Hz,128.9 d Bc/Hz@1 MHz,且电路结构简单,工程应用性强。展开更多
The uplift resistance calculation is an important basis for the construction decisions of the jack-up wind installation vessel and the design of the jacking system,and determines the operation risk and reliability in ...The uplift resistance calculation is an important basis for the construction decisions of the jack-up wind installation vessel and the design of the jacking system,and determines the operation risk and reliability in the installation process of the wind turbine. The influence factors of the pile shoe's penetration depth and uplift resistance are analyzed,and the calculation model and flow of the uplift resistance are given. Based on a construction example,the influence rules are analyzed for the change of the pile shoe's structural parameters on the penetration depth and uplift resistance.The analysis results show that the penetration depth is more sensitive to the width of the pile shoe,and the height has greater influence on the uplift resistance than the length and width of the spud. With the increase of the height,the uplift resistance may increase rapidly.Although the decreases of the length,width and height of the pile shoe may reduce the uplift resistance,the penetration depth may increase in the meantime. This will increase the pulling pile time and reduce the construction efficiency. So the parameters of the pile shoe should be optimized according to the adaptable geology condition so as to obtain the optimal uplift resistance and working efficiency.展开更多
负泊松比结构由于优异的力学特性,逐渐被广泛应用于抗爆炸、抗侵彻等领域。提出了一种基于负泊松比结构的复合结构,从抗侵彻、抗爆炸两个角度设计了三个主要功能层,运用有限元仿真方法探究了异型陶瓷负泊松比复合结构在爆炸环境和弹丸...负泊松比结构由于优异的力学特性,逐渐被广泛应用于抗爆炸、抗侵彻等领域。提出了一种基于负泊松比结构的复合结构,从抗侵彻、抗爆炸两个角度设计了三个主要功能层,运用有限元仿真方法探究了异型陶瓷负泊松比复合结构在爆炸环境和弹丸侵彻下的响应特征,分析了防护机理并设计了参数优化方案,研究了陶瓷层最低厚度、负泊松比结构纵向蜂窝数、内凹六边形凹角、钢板厚度、聚脲层厚度等参数对结构抗爆抗弹性能的影响。通过能量吸收率(Specific Energy Absorption,SEA)、侵彻深度、中心点位移等指标评估不同参数组对应复合结构的防护能力。结果表明,陶瓷层最低厚度是影响结构抗侵彻能力的最大因素,聚脲层厚度和负泊松比结构纵向蜂窝数是影响结构抗爆能力的较大因素。在降低面密度的同时调整各参数,获得了最优抗爆抗侵彻的复合结构设计方案,实现了低面密度与高强防护的结合。研究提供了工程防护增强设计的新思路,助力推进了防护工程轻质化、模块化发展。展开更多
文摘Here, using the Scale-Symmetric Theory (SST) we explain the cosmological tension and the origin of the largest cosmic structures. We show that a change in value of strong coupling constant for cold baryonic matter leads to the disagreement in the galaxy clustering amplitude, quantified by the parameter S8. Within the same model we described the Hubble tension. We described also the mechanism that transforms the gravitational collapse into an explosion—it concerns the dynamics of virtual fields that lead to dark energy. Our calculations concern the Type Ia supernovae and the core-collapse supernovae. We calculated the quantized masses of the progenitors of supernovae, emitted total energy during explosion, and we calculated how much of the released energy was transferred to neutrinos. Value of the speed of sound in the strongly interacting matter measured at the LHC confirms that presented here model is correct. Our calculations show that the Universe is cyclic.
文摘Several parameters of a commercial Si-based Schottky barrier diode (SBD) with unknown metal material and semiconductor-type have been investigated in this work from dark forward and reverse I-V characteristics in the temperature (T) range of [274.5 K - 366.5 K]. Those parameters include the reverse saturation current (I<sub>s</sub>), the ideality factor (n), the series and the shunt resistances (R<sub>s</sub> and R<sub>sh</sub>), the effective and the zero bias barrier heights (Φ<sub>B</sub> and Φ<sub>B0</sub>), the product of the electrical active area (A) and the effective Richardson constant (A**), the built-in potential (V<sub>bi</sub>), together with the semiconductor doping concentration (N<sub>A</sub> or N<sub>D</sub>). Some of them have been extracted by using two or three different methods. The main features of each approach have been clearly stated. From one parameter to another, results have been discussed in terms of structure performance, comparison on one another when extracted from different methods, accordance or discordance with data from other works, and parameter’s temperature or voltage dependence. A comparison of results on Φ<sub>B</sub>, ΦB0</sub>, n and N<sub>A</sub> or N<sub>D</sub> parameters with some available data in literature for the same parameters, has especially led to clear propositions on the identity of the analyzed SBD’s metal and semiconductor-type.
基金supported by the National Natural Science Foundation of China(No.11872207)the Aeronautical Science Foundation of China (No. 20180952007)+1 种基金the Foundation of National Key Laboratory on Ship Vibration and Noise(No.614220400307)the National Key Research and Development Program of China (No.2019YFA708904)。
文摘Intelligent structures like zero Poisson’s ratio(ZPR)cellular structures have been widely applied to the engineering fields such as morphing wings in recent decades,owing to their outstanding characteristics including light weight and low effective modulus. In-plane and out-of-plane mechanical properties of ZPR cellular structures are investigated in this paper. A theoretical method for calculating in-plane tensile modulus,in-plane shear modulus and out-of-plane bending modulus of ZPR cellular structures is proposed,and the impacts of the unit cell geometrical configurations on in-plane tensile modulus,in-plane shear modulus and out-of-plane bending modulus are studied systematically based on finite element(FE)simulation. Experimental tests validate the feasibility and effectiveness of the theoretical and FE analysis. And the results show that the in-plane and out-of-plane mechanical properties of ZPR cellular structures can be manipulated by designing cell geometrical parameters.
文摘描述了一种S波段简易压控振荡器(VCO)的设计。该设计基于负阻原理,利用微波有源器件的小信号S参数,采用低噪声晶体管和变容二极管作为核心器件降低振荡器的相位噪声。适当的匹配补偿电路有效地改善了VCO的调频(FM)线性度,同时,有效地抑制了谐波分量。实际电路测试结果表明:该VCO的中心频率为3.09 GHz,输出功率为10.9 d Bm,调谐范围大于200 MHz,FM线性度优于3%,功率平坦度良好,相位噪声达到了-104.5 d Bc/Hz@100 k Hz,128.9 d Bc/Hz@1 MHz,且电路结构简单,工程应用性强。
基金Department of Transportation Technology of Construction Project,China(No.2013328225080)Natural Science Foundation of Liaoning Province,China(No.2015020121)the Fundamental Research Funds for the Central Universities,China(Nos.3132015087,3132014303)
文摘The uplift resistance calculation is an important basis for the construction decisions of the jack-up wind installation vessel and the design of the jacking system,and determines the operation risk and reliability in the installation process of the wind turbine. The influence factors of the pile shoe's penetration depth and uplift resistance are analyzed,and the calculation model and flow of the uplift resistance are given. Based on a construction example,the influence rules are analyzed for the change of the pile shoe's structural parameters on the penetration depth and uplift resistance.The analysis results show that the penetration depth is more sensitive to the width of the pile shoe,and the height has greater influence on the uplift resistance than the length and width of the spud. With the increase of the height,the uplift resistance may increase rapidly.Although the decreases of the length,width and height of the pile shoe may reduce the uplift resistance,the penetration depth may increase in the meantime. This will increase the pulling pile time and reduce the construction efficiency. So the parameters of the pile shoe should be optimized according to the adaptable geology condition so as to obtain the optimal uplift resistance and working efficiency.
文摘负泊松比结构由于优异的力学特性,逐渐被广泛应用于抗爆炸、抗侵彻等领域。提出了一种基于负泊松比结构的复合结构,从抗侵彻、抗爆炸两个角度设计了三个主要功能层,运用有限元仿真方法探究了异型陶瓷负泊松比复合结构在爆炸环境和弹丸侵彻下的响应特征,分析了防护机理并设计了参数优化方案,研究了陶瓷层最低厚度、负泊松比结构纵向蜂窝数、内凹六边形凹角、钢板厚度、聚脲层厚度等参数对结构抗爆抗弹性能的影响。通过能量吸收率(Specific Energy Absorption,SEA)、侵彻深度、中心点位移等指标评估不同参数组对应复合结构的防护能力。结果表明,陶瓷层最低厚度是影响结构抗侵彻能力的最大因素,聚脲层厚度和负泊松比结构纵向蜂窝数是影响结构抗爆能力的较大因素。在降低面密度的同时调整各参数,获得了最优抗爆抗侵彻的复合结构设计方案,实现了低面密度与高强防护的结合。研究提供了工程防护增强设计的新思路,助力推进了防护工程轻质化、模块化发展。
