期刊文献+
共找到68篇文章
< 1 2 4 >
每页显示 20 50 100
ZnO纳米粒子制备过程中XRD的研究 被引量:11
1
作者 孙晓君 井立强 +4 位作者 徐跃 高忠民 蔡伟民 王志平 郭海忱 《哈尔滨工业大学学报》 EI CAS CSCD 北大核心 2001年第3期381-384,共4页
以前驱物碱式碳酸锌热分解法制备ZnO纳米粒子 ;利用小角X射线散射 (SAXS)、广角X射线衍射(WAXD)技术 ,研究了原料、焙烧温度、焙烧时间和浸洗淋洗等条件对ZnO纳米粒子制备的影响 .结果表明 ,前驱物不淋洗有利于获得较小粒径的ZnO微晶 ,... 以前驱物碱式碳酸锌热分解法制备ZnO纳米粒子 ;利用小角X射线散射 (SAXS)、广角X射线衍射(WAXD)技术 ,研究了原料、焙烧温度、焙烧时间和浸洗淋洗等条件对ZnO纳米粒子制备的影响 .结果表明 ,前驱物不淋洗有利于获得较小粒径的ZnO微晶 ,三种原料Zn(CH3COO) 2 、ZnCl2 和ZnSO4 ·7H2 O中 ,以Zn SO4 ·7H2 O为原料制备的晶粒最小 ;前驱物经焙烧、浸洗、乙醇淋洗后得到了晶粒分布均匀、纯相的ZnO纳米粒子 ,其晶粒尺寸随着焙烧温度、时间的增加 ,晶粒逐渐长大 ;随着晶粒尺寸的减小 ,ZnO的晶胞体积逐渐减小 ,而二类应变均方根值却逐渐增加 。 展开更多
关键词 氧化锌 纳米粒子 小角散射 广角衍射 量子尺寸效应 表面效应 XRD
下载PDF
激光清洁技术及其应用 被引量:12
2
作者 陈林 杨永强 《红外与激光工程》 EI CSCD 北大核心 2004年第3期274-277,共4页
介绍了一种新型材料加工技术———激光清洁技术。对其优点、作用机理和分类都进行了详细阐述,并分析了激光功率密度,脉冲数量,入射角和波长等因素对其清洁效果的影响。此外,还介绍了激光清洁的应用实例,结果表明:激光清洁的效果令人满意。
关键词 激光加工技术 激光清洁 爆发性蒸发 基体 微粒
下载PDF
The Substructure of Elementary Particles Demonstrated by the I-Theory
3
作者 H. H. Swami Isa Christophe Dumas 《Journal of High Energy Physics, Gravitation and Cosmology》 CAS 2024年第2期469-514,共46页
Present studies in physics assume that elementary particles are the building blocks of all matter, and that they are zero-dimensional objects which do not occupy space. The new I-Theory predicts that elementary partic... Present studies in physics assume that elementary particles are the building blocks of all matter, and that they are zero-dimensional objects which do not occupy space. The new I-Theory predicts that elementary particles do indeed have a substructure, three dimensions, and occupy space, being composed of fundamental particles called I-particles. In this article we identify the substructural pattern of elementary particles and define the quanta of energy that form each elementary particle. We demonstrate that the substructure comprises two classes of quanta which we call “attraction quanta” and “repulsion quanta”. We create a model that defines the rest-mass energy of each elementary particle and can predict new particles. Lastly, in order to incorporate this knowledge into the contemporary models of science, a revised periodic table is proposed. 展开更多
关键词 I-Theory I-Particle Causal Subtle Gross Quanta Attraction Quanta Repulsion Quanta elementary particles LEPTONS BOSONS Hadron Periodic Table Black Matter White Matter Red Matter Gravitation Strong Force Weak Force Quantum Theory Heat Quantum Photon Neutrino
下载PDF
Characterizations That Help Explain Particle and Cosmic Data
4
作者 Thomas Joel Buckholtz 《Journal of High Energy Physics, Gravitation and Cosmology》 CAS 2024年第3期1304-1357,共54页
This paper suggests explanations for otherwise seemingly unexplained data about elementary particles and cosmology. The explanations have bases in coordinate-based modeling and in integer-based characterizations for s... This paper suggests explanations for otherwise seemingly unexplained data about elementary particles and cosmology. The explanations have bases in coordinate-based modeling and in integer-based characterizations for some catalogs. One catalog features properties—including charge, mass, and angular momentum—of objects. Another catalog features all known and some possible elementary particles. Assumptions include that multipole-expansion mathematics has uses regarding long-range interactions, such as gravity, and that nature includes six isomers of all elementary particles other than long-range-interaction bosons. One isomer associates with ordinary matter. Five isomers are associated with dark matter. Multipole notions help explain large-scale aspects such as the rate of expansion of the universe. 展开更多
关键词 elementary particles Dark Matter Rate of Expansion of the Universe Galaxy Formation Neutrino Masses Vacuum Energy Dark Energy Quantum Gravity
下载PDF
低密度等离子体融断开关的粒子模拟研究 被引量:5
5
作者 卓红斌 常文蔚 +1 位作者 徐涵 马燕云 《强激光与粒子束》 EI CAS CSCD 北大核心 2001年第4期446-450,共5页
采用 2 .5维柱坐标粒子模拟程序研究了低密度等离子体融断开关 ( PEOS)工作过程中的物理现象 ,介绍了计算模型的建立和复杂边界的算法处理。模拟结果表明 :在 PEOS导通电流的过程中 ,电流通道最初在等离子体的发生器端形成 ,随着导通时... 采用 2 .5维柱坐标粒子模拟程序研究了低密度等离子体融断开关 ( PEOS)工作过程中的物理现象 ,介绍了计算模型的建立和复杂边界的算法处理。模拟结果表明 :在 PEOS导通电流的过程中 ,电流通道最初在等离子体的发生器端形成 ,随着导通时间的增大而向负载端漂移 ,离子的空间分布并没有明显的变化 ;当 PEOS发生断路时 ,等离子体离子的密度会迅速降低 ,并最终导致 PEOS阴极附近的等离子体的密度接近为零 ,此时阴极电子完全受磁场箍缩作用而不能到达阳极 。 展开更多
关键词 粒子模拟 融断开关 电流通道 PEOS 等离子体密度
下载PDF
Inelastic Scattering of Dark Matter with Heavy Cosmic Rays
6
作者 Keyu Lu Yue-Lin Sming Tsai +1 位作者 Qiang Yuan Le Zhang 《Research in Astronomy and Astrophysics》 SCIE CAS CSCD 2024年第6期68-80,共13页
We investigate the impact of inelastic collisions between dark matter(DM)and heavy cosmic ray(CR)nuclei on CR propagation.We approximate the fragmentation cross-sections for DM-CR collisions using collider-measured pr... We investigate the impact of inelastic collisions between dark matter(DM)and heavy cosmic ray(CR)nuclei on CR propagation.We approximate the fragmentation cross-sections for DM-CR collisions using collider-measured proton-nuclei scattering cross-sections,allowing us to assess how these collisions affect the spectra of CR boron and carbon.We derive new CR spectra from DM-CR collisions by incorporating their cross-sections into the source terms and solving the diffusion equation for the complete network of reactions involved in generating secondary species.In a specific example with a coupling strength of b_(χ)=0.1 and a DM mass of m_(χ)=0.1 GeV,considering a simplified scenario where DM interacts exclusively with oxygen,a notable modification in the boron-to-carbon spectrum due to the DM-CR interaction is observed.Particularly,the peak within the spectrum,spanning from 0.1 to 10 GeV,experiences an enhancement of approximately 1.5 times.However,in a more realistic scenario where DM particles interact with all CRs,this peak can be amplified to twice its original value.Utilizing the latest data from AMS-02 and DAMPE on the boron-to-carbon ratio,we estimate a 95%upper limit for the effective inelastic cross-section of DM-proton as a function of DM mass.Our findings reveal that at m_(χ)?2 MeV,the effective inelastic cross-section between DM and protons must be less than O(10^(-32))cm^(2). 展开更多
关键词 elementary particles nuclear reactions NUCLEOSYNTHESIS ABUNDANCES SCATTERING astroparticle physics (cosmology:)dark matter
下载PDF
一个新的射流颗粒速度差公式 被引量:4
7
作者 秦承森 李勇 《爆炸与冲击》 EI CAS CSCD 北大核心 2001年第1期8-12,共5页
从射流拉伸过程的能量关系出发 ,导出了相邻颗粒间速度差的理论公式。这个公式表明 ,速度差与射流初态及物质特性有关 ,因而也与断裂颗粒的几何形状有关。对一般颗粒形状 ,理论给出的无量纲速度与实验结果有较好的一致性。
关键词 成型装药 射流 颗粒化 速度差
下载PDF
The Standard Model Theory [May Be] a Wrong Theory
8
作者 Vaggelis Talios 《Journal of High Energy Physics, Gravitation and Cosmology》 2023年第3期602-610,共9页
The Standard Model is the theory of Physics that describes the elementary particles of matter and the strong, weak and electromagnetic interactions, between them. The theory of the Standard Model does not include the ... The Standard Model is the theory of Physics that describes the elementary particles of matter and the strong, weak and electromagnetic interactions, between them. The theory of the Standard Model does not include the description of the gravitational interactions. It is a very well founded theory that has predicted many experimental results, such as the existence of many particles and has withstood many experimental tests. The key missing piece of the theory to fill in was the Higgs boson, whose existence was reasonably suspected and confirmed by CERN’s ATLAS and CMS experiments in 2012. The current synthesis of the theory was completed in the mid-1970s, after the experimental confirmation of the existence of the quarks, and then confirmed, with the discovery of the Higgs boson, in 2012. All these, are according to the established views of science. But according to the opinions of many scientists, opinions with which I as the author of this paper agree, the theory of the Standard Model is a wrong theory because, while it makes some successful predictions, it does not answer to a number of many other questions that it should answer for its final establishment. Specifically and according to established views, the theory cannot explain the existence of dark matter and dark energy, the behavior of neutrinos and the existence of particles with very different masses. It is also questionable whether the Higgs boson, discovered in the ATLAS experiment is actually the particle that contributes to the creation of the mass of the elementary particles of matter, and whether the Higgs mechanism is theoretically a correct mechanism. There is doubt if the interactions, actually be created by the exchange of bosons? If bosons are really exist? And not any convincing explanation is given by the theory, for the case that, the bosons exist as particles, where were they found? And how do they work? For replace, or fill the void will be left by the theory of the Standard Model, which I believe sooner or later will be renewed or reti 展开更多
关键词 Standard Model elementary particles Higgs Boson New Model INTERACTIONS
下载PDF
哲学与物理学相遇在量子世界 被引量:5
9
作者 郝刘祥 《中国科学院院刊》 CSSCI CSCD 北大核心 2021年第1期28-36,共9页
文章通过分析量子力学中量子态的本体论地位问题、量子场论中何谓基本粒子问题,以及量子引力理论中时间是否存在的问题,表明科学理论的内核是一些基本的形而上学预设。文章指出,哲学与物理学的关系,颇类似于数学与物理学的关系,因此在... 文章通过分析量子力学中量子态的本体论地位问题、量子场论中何谓基本粒子问题,以及量子引力理论中时间是否存在的问题,表明科学理论的内核是一些基本的形而上学预设。文章指出,哲学与物理学的关系,颇类似于数学与物理学的关系,因此在物理学和哲学之间建立更紧密的联盟,会有助于这些问题的澄清与解决。 展开更多
关键词 量子态 基本粒子 时间问题 实在 实体 关系 性质
原文传递
正弦平方势和形变超晶格的沟道特征 被引量:5
10
作者 邵明珠 《Journal of Semiconductors》 EI CAS CSCD 北大核心 1993年第6期353-360,共8页
本文利用我们曾提出的粒子-晶体相互作用势(正弦平方势)讨论了带电粒子在形变超晶格中的运动行为,导出了共振退道时的退道系数,指出了用沟道技术研究形变超晶格的灵敏性、可靠性和重要性。
关键词 半导体材料 超晶格 外延生长 沟道
下载PDF
中子星内部非奇异-奇异夸克物质的相变 被引量:5
11
作者 戴子高 陆■ 彭秋和 《物理学报》 SCIE EI CAS CSCD 北大核心 1993年第8期1210-1215,共6页
研究了中子星内部从两味夸克物质到三味夸克物质的相变过程。发现这个过程的时标短至10^(-7)s,并且在相变中奇异夸克所参加的半轻子过程是中微子能量损失的主要过程。这样,1.4M_⊙质量的中子星内部的非奇异-奇异夸克物质相变会有几个10^... 研究了中子星内部从两味夸克物质到三味夸克物质的相变过程。发现这个过程的时标短至10^(-7)s,并且在相变中奇异夸克所参加的半轻子过程是中微子能量损失的主要过程。这样,1.4M_⊙质量的中子星内部的非奇异-奇异夸克物质相变会有几个10^(51)erg的能量以中微子形式发射出去,这将表现为一种中微子爆现象。 展开更多
关键词 中子星 夸克 相变 奇异性
原文传递
A New Version of Unified Field Theory—Stochastic Quantum Space Theory on Particle Physics and Cosmology 被引量:3
12
作者 Zhi-Yuan Shen 《Journal of Modern Physics》 2013年第10期1213-1380,共168页
Stochastic Quantum Space (SQS) theory is a new version of unified field theory based on three fundamental postulations: Gaussian Probability Postulation, Prime Numbers Postulation, Vacuon Postulation. It build a frame... Stochastic Quantum Space (SQS) theory is a new version of unified field theory based on three fundamental postulations: Gaussian Probability Postulation, Prime Numbers Postulation, Vacuon Postulation. It build a framework with theoretical results agree with many experimental data well. For more information, please refer to the PDF. 展开更多
关键词 Unified Field THEORY SPACE Structure elementary particles Gaussian Probability Prime Numbers SPORADIC Groups GUT DARK Matter DARK Energy Cosmos INFLATON MULTIVERSE Anthropic Principle General Relativity Primary Basic Equations
下载PDF
X-ray flares of γ-ray bursts: Quakes of solid quark stars? 被引量:3
13
作者 XU RenXin1 & LIANG EnWei2 1 School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China 2 Department of Physics, Guangxi University, Nanning 530004, China 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS 2009年第2期315-320,共6页
A star-quake model is proposed to understand X-ray flares of both long and short γ-ray bursts (GRBs) in a solid quark star regime. Two kinds of central engines for GRBs are available if pulsar-like stars are actually... A star-quake model is proposed to understand X-ray flares of both long and short γ-ray bursts (GRBs) in a solid quark star regime. Two kinds of central engines for GRBs are available if pulsar-like stars are actually (solid) quark stars, i.e., the SNE-type GRBs and the SGR-type GRBs. It is found that a quark star could be solidified about 103 to 106 s later after its birth if the critical temperature of phase transi- tion is a few Metga-electron-volts, and then a new source of free energy (i.e., elastic and gravitational ones, rather than rotational or magnetic energy) could be possible to power GRB X-ray flares. 展开更多
关键词 γ-rays bursts: X-rays NEUTRON STARS elementary particles
原文传递
小粒子体系的自发磁化 被引量:1
14
作者 孙继荣 沈中毅 +1 位作者 刘勇 蒲富恪 《物理学报》 SCIE EI CAS CSCD 北大核心 1993年第1期134-141,共8页
从自旋波理论出发,通过直接求解Heisenberg模型,研究了低温下小粒子自旋体系的自发磁化规律。研究表明:极低温下自旋波被冻结;在任何温度范围内,Bloch T^(3/2)定律都不再严格成立。同时,本文还给出了小粒子中自旋受激反转几率随位置的分... 从自旋波理论出发,通过直接求解Heisenberg模型,研究了低温下小粒子自旋体系的自发磁化规律。研究表明:极低温下自旋波被冻结;在任何温度范围内,Bloch T^(3/2)定律都不再严格成立。同时,本文还给出了小粒子中自旋受激反转几率随位置的分布,指出低温下不存在运动明显剧烈的表面层。 展开更多
关键词 小粒子体系 自旋波 磁化 低温
原文传递
Elementary Particles Result from Space-Time Quantization 被引量:2
15
作者 A. Meessen 《Journal of Modern Physics》 2021年第11期1573-1605,共33页
We justify and extend the standard model of elementary particle physics by generalizing the theory of relativity and quantum mechanics. The usual assumption that space and time are continuous implies, indeed, that it ... We justify and extend the standard model of elementary particle physics by generalizing the theory of relativity and quantum mechanics. The usual assumption that space and time are continuous implies, indeed, that it should be possible to measure arbitrarily small intervals of space and time, but we ignore if that is true or not. It is thus more realistic to consider an extremely small “quantum of length” of yet unknown value <em>a</em>. It is only required to be a universal constant for all inertial frames, like<em> c</em> and <em>h</em>. This yields a logically consistent theory and accounts for elementary particles by means of four new quantum numbers. They define “particle states” in terms of modulations of wave functions at the smallest possible scale in space-time. The resulting classification of elementary particles accounts also for dark matter. Antiparticles are redefined, without needing negative energy states and recently observed “anomalies” can be explained. 展开更多
关键词 Standard Model elementary particles Space-Time Quantization Dark Matter B Mesons DM Detection X 17 Ice Cube Muon Anomaly Do Decay Matter-Antimatter Asymmetry QUANTUM-GRAVITY Big Bang
下载PDF
Conservation Laws of Physics in Dirac Vacuum and β-Decay of Nuclei 被引量:1
16
作者 Erich R. Bagge (Institute for Pure & Applied Nuclear Physics, Christian Albrechts University, Kiel, Germany) 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 1995年第4期45-58,共14页
The laws of conservation of energy, linear momentum. and angular momentum of a system form a closed unit according to Noether's theorem. A generalization of these laws (including spin) for elementary par- ticles ... The laws of conservation of energy, linear momentum. and angular momentum of a system form a closed unit according to Noether's theorem. A generalization of these laws (including spin) for elementary par- ticles taking into account the states of negative energies of the Dirac vacuum is given. A new interpretation of the β-decay of nuclei without neutrinos. using interactions with Dirac's anti-world is discussed, which ex- plains all characteristics of the β-continuum. A quantum-electrodynamic theory of β-decay is presented in which Fermi's constant g of weak interactions is determined from first principles (without neutrinos). The lat- ter is an expression of e, h, c, m, M, and R, i.e., g is not an independent constant of physics nor is it necessa- ry to measure it. 展开更多
关键词 Conservation laws elementary particles β-Decay EM interactions Fermi interaction Coupling constants Dirac vacuum Anti-world.
下载PDF
Soliton-Like Spherical Symmetric Solutions to the Electromagnetic and Scalar Nonlinear Induction Field Equations in the General Relativity Theory
17
作者 Arnaud E. Yamadjako Alain Adomou +2 位作者 Yélomè J. F. Kpomahou Jonas Edou Siaka Massou 《Journal of High Energy Physics, Gravitation and Cosmology》 2022年第1期147-163,共17页
In this paper, we have used the static spherical symmetric metric. The parameter of the nonlinearity fields is included in the arbitrary function characterizing the interaction between the electromagnetic and scalar f... In this paper, we have used the static spherical symmetric metric. The parameter of the nonlinearity fields is included in the arbitrary function characterizing the interaction between the electromagnetic and scalar fields. Taking into account the own gravitational field of elementary particles, we have obtained exact static spherical symmetric solutions to the electromagnetic and scalar field equations of nonlinear induction. Considering all forms of the solution of Liouville equation, we proved that the metric functions are regular with localized energy density. Moreover, the total energy of the nonlinear induction fields is bounded and the total charge of the elementary particles has a finite value (soliton-like). In the flat space-time, soliton-like solutions exist. 展开更多
关键词 Interaction SCALAR ELECTROMAGNETIC Gravitational Fields Description Configuration elementary particles
下载PDF
The Higgs Boson in the Periodic System of Elementary Particles 被引量:1
18
作者 Ding-Yu Chung Ray Hefferlin 《Journal of Modern Physics》 2013年第4期21-26,共6页
It is proposed that the observed Higgs Boson at the LHC is the Standard Model Higgs boson that adopts the existence of the hidden lepton condensate. The hidden lepton is in the forbidden lepton family, outside of the ... It is proposed that the observed Higgs Boson at the LHC is the Standard Model Higgs boson that adopts the existence of the hidden lepton condensate. The hidden lepton is in the forbidden lepton family, outside of the three lepton families of the Standard Model. Being forbidden, a single hidden lepton cannot exist alone;so it must exist in the lepton condensate as a composite of μ’ and μ’± hidden leptons and their corresponding antileptons. The calculated average mass of the hidden lepton condensate is 128.8 GeV in good agreements with the observed 125 or 126 GeV. The masses of the hidden lepton condensate and all elementary particles including leptons, quarks, and gauge bosons are derived from the periodic system of elementary particles. The calculated constituent masses are in good agreement with the observed values by using only four known constants: the number of the extra spatial dimensions in the eleven-dimensional membrane, the mass of electron, the mass of Z boson, and the fine structure constant. 展开更多
关键词 HIGGS BOSON PERIODIC SYSTEM elementary particles
下载PDF
超新星核中的非奇异-奇异夸克物质相变 被引量:2
19
作者 戴子高 彭秋和 陆埮 《天文学报》 CSCD 北大核心 1994年第4期337-347,共11页
最近Gentile等研究了超新星核区从核物质到夸克物质的一级相变.沿着他们的工作,本文研究从两味夸克物质到三味夸克物质的相变过程.我们发现相变时标小于10-7秒.超新星的中心温度和核区的中微子总能量明显增大,这不仅会... 最近Gentile等研究了超新星核区从核物质到夸克物质的一级相变.沿着他们的工作,本文研究从两味夸克物质到三味夸克物质的相变过程.我们发现相变时标小于10-7秒.超新星的中心温度和核区的中微子总能量明显增大,这不仅会增加超新星爆发的成功机会,而且会提高复活激波的能量,同时会影响新生中子星的冷却.核区存在Schwarzschild对流. 展开更多
关键词 致密物质 基本粒子 中子星 超新星 星系核
下载PDF
等离子体融断开关磁场Hall渗透机制的模拟研究 被引量:2
20
作者 卓红斌 常文蔚 徐涵 《强激光与粒子束》 EI CAS CSCD 北大核心 2001年第6期711-716,共6页
利用自行研制的 2 -1 /2维全电磁柱坐标粒子模拟程序对等离子体融断开关磁场渗透机制进行了模拟研究。模拟结果表明在磁场 Hall渗透机制特征长度远远小于等离子体离子的无碰撞趋肤深度的条件下 ,等离子体内部磁场渗透过程主要由电子流... 利用自行研制的 2 -1 /2维全电磁柱坐标粒子模拟程序对等离子体融断开关磁场渗透机制进行了模拟研究。模拟结果表明在磁场 Hall渗透机制特征长度远远小于等离子体离子的无碰撞趋肤深度的条件下 ,等离子体内部磁场渗透过程主要由电子流体运动的 Hall项来控制。对于等离子体空间分布存在较大的密度梯度的物理问题 ,必须考虑二维空间特性对磁场渗透速度的影响。在磁场已渗透经过的等离子体区域中 ,等离子体呈现非电中性 ,离子受静电场的作用会加速运动到达阴极 。 展开更多
关键词 粒子模拟 等离子体融断开关 磁场渗透 PEOS Hall项 等离子体
下载PDF
上一页 1 2 4 下一页 到第
使用帮助 返回顶部