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The Bright Single Pulse Emission from PSR B1133+16

Research in Astronomy and Astrophysics 2024年第4期24卷 253-261页

作者： Jun Tan Zhi-Gang Wen Zhen Wang Xue-Feng Duan Hong-Guang Wang Na Wang Vishal Gajjar Jian-Ping Yuan Rai Yuen Wen-Ming Yan Jian-Ling Chen Wei Han Hui Wang Cheng-Bing Lyu Ai-Jun Dong maths and Information Technology School Yuncheng UniversityYuncheng 044000China Xinjiang Astronomical Observatory Chinese Academy of SciencesUrumqi 830011China Xinjiang Key Laboratory of Radio Astrophysics Urumqi 830011China School of Physics and Materials Science Guangzhou UniversityGuangzhou 510006China Space Science Laboratory University of CaliforniaBerkeley 94710USA department of Physics and Electronic Engineering Yuncheng UniversityYuncheng 044000China School of Physics and Electronic Science Guizhou Normal UniversityGuiyang 550025China

We have conducted a comprehensive investigation into the bright single pulse emission from PSR B1133+16using the Giant Metrewave Radio *** time resolution data(61μs)were obtained at a center frequency of 322 MHz with a bandwidth of 32 MHz over a continuous observation period of 7.45 hr.A total of 1082 bright pulses were sporadically detected with peak flux densities ranging from 10 to 23 times stronger than the average pulse ***,no giant pulse-like emission with a relative pulse energy larger than 10 and extremely short duration was detected,indicating that these bright pulses cannot be categorized as giant pulse *** majority of these bright pulses are concentrated in pulse phases at both the leading and trailing windows of the average pulse profile,with an occurrence ratio of approximately *** pulse energy distribution for all individual pulses can be described by a combination of two Gaussian components and a cutoff power-law with an index of α=-*** updated nulling fraction of 15.35%±0.45% was determined from the energy *** emission of individual pulses follows a log-normal distribution in peak flux density *** is imperative that regular phase drifting in bright pulse sequence is identified in both the leading and trailing components for the first *** physical mechanisms are discussed in detail to provide insights into these observations.

关键词： (stars:)pulsars:general (stars:)pulsars:individual(PSR B1133+16) methods:observational methods:data analysis

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Comparative Study of the Reliability and Complexity of Symmetrical and Asymmetrical Cryptosystems for the Protection of Academic Data in the Democratic Republic of Congo

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Journal of Information Security 2024年第3期15卷 299-307页

作者： Mugaruka Buduge Gulain Jeremie Ndikumagenge Buhendwa Nyenyezi Justin Bulonza Masumbuko Alexis Katho Seba Jacques department of Management Computing for Companies Section of Commercial and Computing Sciences Teachers Training College of Bukavu Bukavu The Democratic Republic of the Congo Center of Research in Infracture Environment and Technology (CRIET) Doctoral School University of Burundi Bujumbura Burundi department of maths-Physics Section of Exact Sciences Teachers Training College of Bukavu Bukavu The Democratic Republic of the Congo Higher Institute of Medical Techniques of Bukavu Bukavu The Democratic Republic of the Congo department of maths-Physics Section of Exact Sciences Teachers Training College of Bunia Bunia The Democratic Republic of the Congo

In the digital age, the data exchanged within a company is a wealth of knowledge. The survival, growth and influence of a company in the short, medium and long term depend on it. Indeed, it is the lifeblood of any modern company. A companys operational and historical data contains strategic and operational knowledge of ever-increasing added value. The emergence of a new paradigm: big data. Today, the value of the data scattered throughout this mother of knowledge is calculated in billions of dollars, depending on its size, scope and area of intervention. With the rise of computer networks and distributed systems, the threats to these sensitive resources have steadily increased, jeopardizing the existence of the company itself by drying up production and losing the interest of customers and suppliers. These threats range from sabotage to bankruptcy. For several decades now, most companies have been using encryption algorithms to protect and secure their information systems against the threats and dangers posed by the inherent vulnerabilities of their infrastructure and the current economic climate. This vulnerability requires companies to make the right choice of algorithms to implement in their management systems. For this reason, the present work aims to carry out a comparative study of the reliability and effectiveness of symmetrical and asymmetrical cryptosystems, in order to identify one or more suitable for securing academic data in the DRC. The analysis of the robustness of commonly used symmetric and asymmetric cryptosystems will be the subject of simulations in this article.

关键词： Comparative Study Cryptosystems Symmetric Encryption Asymmetric Encryption

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A Novel Layered Double Hydroxide and Dodecyl Alcohol Assisted PCM Composite with High Latent Heat Storage Capacity and Thermal Conductivity

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Journal of Thermal Science 2024年第2期33卷 537-547页

作者： AL-AHMED Amir SARI Ahmet KHAN Firoz AL-RASHEIDI Masoud Hekimoğlu Gökhan AFZAAL Mohammad A.ALSULAMI Ahmed DAFALLA Hatim SALHI Billel A.ALSULAIMAN Fahad Interdisciplinary Research Center for Renewable Energy and Power Systems(IRC-REPS) King Fahd University of Petroleum&MineralsDhahran31261Saudi Arabia department of Metallurgical and Material Engineering Karadeniz Technical UniversityTrabzon61080Turkey maths and Natural Sciences Division Higher Colleges of TechnologyP.O.Box 7947SharjahUnited Arab Emirates department of Mechanical Engineering King Fahd University of Petroleum&MineralsDhahran31261Saudi Arabia Core Research Facilities King Fahd University of Petroleum&MineralsDhahran31261Saudi Arabia Interdisciplinary Research Center for Membranes and Water Security King Fahd University of Petroleum&MineralsDhahran31261Saudi Arabia

Dodecyl alcohol(DDA) is a promising solid-liquid phase change material(PCM) due to its favorable latent heat storage(LHS) ***,the leakage issue of PCM in a melted state during the heating period and low thermal conductivity restricts its utilization potential in thermal energy storage(TES) *** the same context,the present work aims to overcome the leakage issue and improve the thermal conductivity of the *** this in mind,a novel leak-proof layered double hydroxide(LDH)/DDA composite PCM is proposed through a solution-based impregnation *** leak-proof impregnation ratio of the DDA impregnated within the cavities of the synthesized Al/Fe-LDH was determined to be 60%.Detailed morphological,physicochemical,and thermal properties of the fabricated composite were studied by scanning electron microscopy(SEM),Fourier transforms infrared(FTIR) spectroscopy,X-ray diffraction(XRD)spectroscopy,differential scanning calorimetry(DSC),thermalgravimetric analysis(TGA),and thermal cycling *** results show that the LDH/DDA composite has a suitable phase change temperature(about 20℃) for passive solar thermal management of building *** composite PCM showed high LHS enthalpy(about136 J/g),good thermal stability,and cycling LHS *** also showed nearly 152% higher thermal conductivity compared to that of pure DDA,ultimately reducing the melting and solidification time of the pure DDA by 44.9% and 45.5%,respectively.

关键词： dodecyl alcohol layered double hydroxide composite PCM thermal conductivity thermal energy storage(TES)

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Controlled quantum state transfer via parity measurement

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Science China(Physics,Mechanics & Astronomy) 2009年第8期52卷 1203-1207页

作者： YUAN Quan LI JiuHui maths and Physics department Liaoning University of TechnologyJinzhou 121001China

In this work,a scheme for controlled quantum state transfer is proposed using parity measurement in a cavity-waveguide *** two special cases,two schemes of controlled quantum state transfer for one qubit and two qubits are investigated in *** important advantage is that controlled quantum state transfer can be completed by single-qubit rotations and the measurement of ***,the present scheme might be realized in the scope of current experimental technology.

关键词： controlled quantum state transfer parity measurement single qubit measurement

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Energy dependence of non-linear dynamical features in e^+e^- collisions

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Chinese Physics C 2008年第7期32卷 552-555页

作者：李迪开陈刚魏会领 department of Physics College of Maths and PhysicsChina University of GeosciencesWuhan 430074China

A study of the dynamical fluctuation properties at various c.m. energies in e^＋e^- collisions is performed using the Monte Carlo method. The results suggest that, after the normalized factorial moments of 3-dimensional phase space are analyzed using an isotropical phase space partition, the NFM describing non- linear dynamical properties show a power-law scaling, i.e., the dynamical fluctuations in higher dimensional phase space are isotropic. For c.m. energies √s≤ 80 GeV, the scaling exponents φq increase rapidly with the c.m. energy and for c.m. energies √s 〉 80 GeV, the φq gradually saturate.

关键词： e^+e^- collisions non-linear dynamical property factorial moments energy dependence

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Diffusion Dynamics of Cux Cluster on Cu（111） Surface

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Chinese Journal of Chemical Physics 2008年第1期21卷 27-31页

作者： Jian-feng Tang Mai-chang Xu Xue-song Li Wo-yun Long department of Applied Physics Hunan Agricultural University Changsha 410128 China department of maths and Physics Hunan Institute of Engineering Xiangtan 411104 China

The diffusion dynamics of small two-dimensional atomic clusters Cux （1≤x≤8） on Cu（lll） surface were studied using the molecular dynamics simulations and a modified analytic embedded-atom method in the temperature range from 200 K to 800 K. The cluster size and temperature dependence of the diffusion coefficients and migration energies are presented. Our simulations show that the diffusion migration energy of the CuT cluster is the highest and the prefactor for the CuT cluster is almost three orders of magnitude larger than that for single atom diffusion. This conclusion is consistent with the experimental results for similar metals. In addition, the dependence of cluster diffusion on film growth is also discussed.

关键词： Cluster Molecular dynamics Surface diffusion

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Appearance of metallic features in small tungsten clusters

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Chinese Physics B 2009年第6期18卷 2264-2270页

作者：雷雪玲王先明祝恒江罗有华 School of maths-Physics and Information Sciences Xinjiang Normal University department of Physics East China University of Science and Technology

The structures and properties of Wn （n = 2-14） clusters were studied by using the density functional theory （DFT） at LSDA level. The most stable structures of Wn （n = 2-14） clusters with global minimum were determined. The average binding energy （Eb）, the first and second difference of total energy （△E, △2E）, the vertical detachment energy （VDE）, and the HOMO-LUMO gap versus the size were also discussed. The abrupt decrease of VDE and HOMO-LUMO gap at size n = 8 and 10 implied that tungsten clusters of W8 and W10 appeared to have metallic features. These changes were also accompanied by the delocalization of electron charge density and the strong hybridization between 5d and 6s orbits in W8 and W10 clusters. Our results are in good agreement with the available experimental data.

关键词： Wn clusters density functional theory lowest-energy structures metallic features

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Electric-Current-Induced Heat Generation in Kondo Regime

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Communications in Theoretical Physics 2010年第7期54卷 171-174页

作者：陈桥张亚民 department of maths and Physics Hunan Institute of Engineering North College of Beijing University of Chemical Technology

Using the nonequilibrium Green's function technique,we investigate the current induced heat generationin Kondo *** Kondo effect influences the heat generation *** the curve of heat generation versusthe bias,a negative differential of the heat generation is *** symmetry of the heat generation is destroyed bythe strong electron-electron interaction and the electron-phonon interaction.

关键词： heat generation Kondo effect quantum dot nonequilibrium Green's function

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Conservation Laws and Self-Consistent Sources for a Super-Classical-Boussinesq Hierarchy

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Chinese Physics Letters 2011年第12期28卷 1-4页

作者： YU Fa-Jun College of maths and Systematic Science Shenyang Normal UniversityShenyang 110034

The super-classical-Boussinesq hierarchy with self-consistent sources is ***,infinitely many conservation laws for the integrable super-classical-Boussinesq hierarchy are established.

关键词： Boussinesq infinitely integrable

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Hawking Tunneling Radiation of Black Holes in Deformed Horava-Lifshitz Gravity

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Communications in Theoretical Physics 2011年第2期55卷 376-380页

作者：曾晓雄李玲 Journal of Sichuan University of Arts and Science department of maths and Finance-Economics Sichuan University of Arts and Science

Tunneling of scalar particles and Dirac particles from a black hole in the deformed Horava-Lifshitz gravity is discussed in this paper. We consider the case that the dynamical coupling constant λ= 1, when it reduces to Einstein＇s General Relativity at large scales and the black hole behaves like the Reissner-Nordstr6m black hole. The result shows that though the black hole entropy bears logarithmic correction, the tunneling probability is still related to its differences for the scalar particles and Dirac particles.

关键词： Horava-Lifshitz gravity tunneling black hole entropy

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