Grain alignment modulation and observed electrical transport properties of Ca3Co4O9 ceramics
Publication date: March 2019Source: Results in Physics, Volume 12Author(s): F.P. Zhang, J.L. Shi, J.W. Zhang, X.Y. Yang, J.X. ZhangAbstractThe polycrystalline Ca3Co4O9 oxide powders were synthesized by citrate acid sol-gel method, and the Ca3Co4O9 oxide ceramics with diverse grain alignments were prepared by sintering the pressed pellet bulks through controlling the procedures, respectively. The phase compositions, grain alignments, bulk microstructures, textures as well as the electrical transport properties were investigated by means of X-ray diffraction pattern XRD, scanning electron microscopy SEM, transmission electro...
Source: Results in Physics - December 3, 2018 Category: Physics Source Type: research

Creep degradation assessment in 9%Cr heat-resistant steel welded joints using ultrasonic methods
Publication date: March 2019Source: Results in Physics, Volume 12Author(s): Xiao Wang, Xue Wang, Bin Luo, Xian-long Hu, Ting-bi YuanAbstractThe assessment of creep degradation in a 9%Cr heat-resistant steel welded joint has been carried out by means of nonlinear ultrasonic and traditional linear ultrasonic technique. The ultrasonic measurements were conducted at several regions of welded joint, which include the WM, HAZ, and BM. The experimental results indicate that, as creep time extends, the nonlinear parameter show a general upward trend in each region, and the largest increase of nonlinear parameter occurred on the HA...
Source: Results in Physics - December 2, 2018 Category: Physics Source Type: research

DC and RF characteristics optimization of AlGaN/GaN/BGaN/GaN/Si HEMT for microwave-power and high temperature application
Publication date: March 2019Source: Results in Physics, Volume 12Author(s): Moujahed GASSOUMI, Abdelhamid HELALI, Hassen MAAREF, Malek GASSOUMIAbstractAlGaN/GaN/Si high electron mobility transistors (HEMTs) developed by molecular beam epitaxy (MBE) are studied with several methods for characterization, the most utilized are direct-current and radio-frequency measurements, to see power and microwave performance of components. The increase in these parameters is not based just with on improvement technological for example, decrease of length gate (Lg) and passivation. For sure, another very important point is to reduce the t...
Source: Results in Physics - December 1, 2018 Category: Physics Source Type: research

Use of lined-up auxiliary functions in the evaluation of overlap integrals over integer and non-integer n Slater type orbitals
Publication date: March 2019Source: Results in Physics, Volume 12Author(s): Israfil I. Guseinov, Zekayi Andıç, Bahtiyar A. Mamedov, Nurşen Seçkin GörgünAbstractA combined theory for the overlap integrals of integer and non-integer n χ-Slater type orbitals (χ-ISTO and χ-NISTO) is presented. This approach is based on the use of lined-up auxiliary functions introduced by one of the authors. The suggested theory guarantees a highly accurate calculation of the overlap integrals for the arbitrary values of quantum numbers and locations of orbitals.Graphical abstractThe lined-up auxiliary fun...
Source: Results in Physics - December 1, 2018 Category: Physics Source Type: research

Comparing a few distributions of transverse momenta in high energy collisions
Publication date: March 2019Source: Results in Physics, Volume 12Author(s): Qi Wang, Pei-Pin Yang, Fu-Hu LiuAbstractTransverse momentum spectra of particles produced in high energy collisions are very important due to their relations to the excitation degree of interacting system. To describe the transverse momentum spectra, one can use more than one probability density functions of transverse momenta, which are simply called the functions or distributions of transverse momenta in some cases. In this paper, a few distributions of transverse momenta in high energy collisions are compared with each other in terms of plots to...
Source: Results in Physics - December 1, 2018 Category: Physics Source Type: research

Stress analysis of a functionally graded plate integrated with piezoelectric faces via a four-unknown shear deformation theory
Publication date: March 2019Source: Results in Physics, Volume 12Author(s): A.M. Zenkour, R.A. AlghanmiAbstractAnalysis for stress and deformation of a functionally graded plate integrated with faces made of piezoelectric materials is proposed in this paper. Four-unknown shear deformation plate theory is applied to express the displacement components. The electric potential distribution is composed of a linear function along the thickness direction and a cosine function along the planar coordinate. The plate is under mechanical load and the piezoelectric faces are subjected to an applied voltage. The governing equations an...
Source: Results in Physics - December 1, 2018 Category: Physics Source Type: research

Radar absorbing combinatorial metamaterial based on silicon carbide/carbon foam material embedded with split square ring metal
Publication date: March 2019Source: Results in Physics, Volume 12Author(s): Wanchong Li, Lihai Lin, Chusen Li, Yan Wang, Jinsong ZhangAbstractA broadband radar absorbing combinatorial foam metamaterial (CFMM) was developed and evaluated via simulation and experimentation. CFMM was constructed using silicon carbide/carbon (SiC/C) foam material, a FR4 dielectric material, and a metal pattern. The SiC/C foam material was prepared using a template. The metal pattern consists of a square ring with four split gaps in the middle of the ring. As a result of this new design, the influence of metal pattern design geometrical dimensi...
Source: Results in Physics - December 1, 2018 Category: Physics Source Type: research

Wave propagation characteristics in nanoporous metal foam nanobeams
Publication date: March 2019Source: Results in Physics, Volume 12Author(s): Yan Qing Wang, Chen LiangAbstractThis research is devoted to the wave propagation characteristics analysis of nanobeams made of nanoporous metal foams. Three nanoporosity distribution models, namely, symmetry, asymmetry and uniform distributions, are taken into account. The nonlocal elasticity theory together with the Euler-Bernoulli and Timoshenko beam theories is used to model the present system. The wave dispersion relations for nanoporous metal foam nanobeams are derived detailedly. In addition, studies are carried out to scrutinize the effects...
Source: Results in Physics - December 1, 2018 Category: Physics Source Type: research

One-pot hydrothermal synthesis of Al-doped MoS2@graphene aerogel nanocomposite electrocatalysts for enhanced hydrogen evolution reaction
Publication date: March 2019Source: Results in Physics, Volume 12Author(s): Wenqiang Su, Ping Wang, Zhengyang Cai, Junhe Yang, Xianying WangAbstractMolybdenum disulfide (MoS2) has shown its promising performance for use as an electrocatalyst for hydrogen evolution reaction (HER). However, it has commonly suffered from limited edge active sites and stagnant conductivity in this regard. Therefore in the present work, with integrating graphene aerogel (GA) supporting and Al ions doping, we report for the first time one-pot hydrothermal synthesis of Al-doped MoS2@GA aerogel electrocatalysts with 3D porous network architecture....
Source: Results in Physics - November 30, 2018 Category: Physics Source Type: research

Combined metal-assisted chemical etching and anisotropic wet etching for anti-reflection inverted pyramidal cavities on dendrite-like textured substrates
Publication date: March 2019Source: Results in Physics, Volume 12Author(s): Yu-Keng Lin, Yen-Shin Chen, Chun-Hway HsuehAbstractA simple and low-cost method using the combination of metal-assisted chemical etching (MacEtch) and anisotropic wet etching was performed to fabricate anti-reflection inverted pyramidal cavities on dendrite-like textured silicon substrates. To achieve this, a thin Ag film was deposited on an n-type (100) silicon substrate to form agglomerated Ag particles and MacEtch was performed to obtain vertically aligned etching holes on Si substrate. Subsequently, anisotropic wet etching was conducted and the...
Source: Results in Physics - November 30, 2018 Category: Physics Source Type: research

Experimental investigation of photon attenuation behaviors for concretes including natural perlite mineral
Publication date: March 2019Source: Results in Physics, Volume 12Author(s): Osman Agar, Hüseyin O. Tekin, M.I. Sayyed, Mehmet E. Korkmaz, Ozgur Culfa, Can ErtugayAbstractPerlite mineral contains relatively high water and in general hydrated obsidian forms the perlite which is mainly an amorphous volcanic glass. Photon attenuation properties for different concrete types including natural perlite mineral and B4C have been experimentally investigated by using different radioactive point sources at 81, 276, 303, 356, 384, 662, 1173, 1275 and 1333 keV. SEM and EDAX analyses were carried out to control the crystal structu...
Source: Results in Physics - November 29, 2018 Category: Physics Source Type: research

Simulation of atomic displacements cascades in α-zirconium near β-Nb-20%Zr precipitate
Publication date: March 2019Source: Results in Physics, Volume 12Author(s): P.E. Kapustin, M.Yu. Tikhonchev, R.T. Sibatov, V.V. SvetukhinAbstractThe evolution of atomic displacements cascades near the spherical binary precipitate Nb-20%Zr with the bcc lattice in the hcp α-Zr matrix was simulated using the method of molecular dynamics. The cascade is initiated by a 10 keV primary-knocked Zr atom at a distance ∼10 Å from the surface of spherical binary precipitate of radius ∼50 Å. The simulation results show that at the stage of the primary radiation damage, a change in the composition of the ...
Source: Results in Physics - November 29, 2018 Category: Physics Source Type: research

Study of dielectric relaxation and thermally activated a.c. conduction in multicomponent Ge10−xSe60Te30Inx (0 ≤ x ≤ 6) chalcogenide glasses using CBH model
Publication date: March 2019Source: Results in Physics, Volume 12Author(s): Pravin Kumar Singh, S.K. Sharma, S.K. Tripathi, D.K. DwivediAbstractAmorphous Ge10−xSe60Te30Inx (0 ≤ x ≤ 6) chalcogenide glasses were prepared by melt quench technique. Surface morphology with the chemical composition of the prepared glass was examined using SEM and EDS analysis respectively. Dielectric properties and a.c. conductivity of the multicomponent Ge10−xSe60Te30Inx (0 ≤ x ≤ 6) chalcogenide glasses have been examined in the frequency range 100 Hz–1 MHz and temperature range 303–328 ...
Source: Results in Physics - November 29, 2018 Category: Physics Source Type: research

Preparation of polypropylene/short glass fiber composite as Fused Deposition Modeling (FDM) filament
Publication date: March 2019Source: Results in Physics, Volume 12Author(s): Gholamhossein Sodeifian, Saghar Ghaseminejad, Ali Akbar YousefiAbstractMechanical, morphological, rheological, and crystallinity properties of pure polypropylene (PP)/glass fiber (GF) and PP/GF composites containing maleic anhydride polyolefin (POE-g-MA) at three different weight percentages (10, 20 and 30 wt%) were investigated. The test specimens were provided using 3D printing (FDM) and compression molding (CM) methods. Given brittleness and insufficient flexibility of the prepared filaments, POE-g-MA was used at different weight percentages, ...
Source: Results in Physics - November 29, 2018 Category: Physics Source Type: research

Fabrication of α-alumina fibers by sol-gel and electrospinning of aluminum nitrate precursor solutions
Publication date: March 2019Source: Results in Physics, Volume 12Author(s): José Hafid Roque-Ruiz, Nahúm A. Medellín-Castillo, Simón Yobanny Reyes-LópezAbstractThe fabrication of dense alumina fibers at low cost by sol-gel and electrospinning, using aluminum nitrate as precursor is reported. Polyvinyl pyrrolidone was used as spinning polymer, while Pluronic 127 was used as additive to achieve a porous structure. The material was characterized at different stages of thermal treatment by SEM, EDS, FTIR, XRD, and thermal analyses. It was observed that the increase in precursor ratio is relat...
Source: Results in Physics - November 28, 2018 Category: Physics Source Type: research

Some characteristic parameters of proton from the bag model
Publication date: March 2019Source: Results in Physics, Volume 12Author(s): Z.G. Tan, Z.D. Li, Y. ChenAbstractWe treat the mass of a proton as the total static energy which can be separated into two parts that come from the contribution of quarks and gluons respectively. We adopt the essential of the bag model of hadron to discuss the structure of a proton and find that the calculated temperature, proton radius, the bag constant are acceptable if a proton is a thermal equilibrium system of quarks and gluons. (Source: Results in Physics)
Source: Results in Physics - November 28, 2018 Category: Physics Source Type: research

The relativistic computations of spectral lines of 129Xe I
Publication date: March 2019Source: Results in Physics, Volume 12Author(s): Wa'el Salah, Ola HassounehAbstractIn this paper, we present our achievement on the relativistic computations of the spectral lines for the levels belonging to the 6s[k]J, 4f[k]J, 5d[k]J, 6p[k]J, 7s[k]J, 5f[k]J, 6d[k]J, 7p[k]J and 8s[k]J intermediate Rydberg series in the heavy xenon-129 isotope. These spectral lines are identified by the energy levels, the transition rates, the oscillator strengths, the Landé gj-factors and the magnetic dipole hyperfine constant. Inasmuch as the transitions from the ground state to the 4f and 5f levels in ad...
Source: Results in Physics - November 28, 2018 Category: Physics Source Type: research

Enhanced NRZ multi-carriers modulation technologies for microresonators in THz technology applications
The objective of the research is to generate multi-carriers at infrared region and modulate them for the optical communication application using the microring resonators. At the transmitter part, series of microring resonators have been used to generate four different THz frequencies which can be either de-multiplexed and modulated individually using the NRZ modulation format or modulated without de-multiplexing them as these enter a series of microring resonator modulators and microring resonator drop filters. As results, the detection of the four NRZ modulated frequencies has been performed successfully with high signal ...
Source: Results in Physics - November 28, 2018 Category: Physics Source Type: research

Impact of ionizing radiation doses on nanocrystalline TiO2 layer in DSSC’s photoanode film
In this study, 10 µm thick TiO2 (Degussa-P25) was deposited as a photoanode film on microscopic glass slide with the doctor-blade coating. The deposited film was subjected to different gamma (γ) radiation doses (0–20 kGy) to study the effect of ionizing radiation on morphological, structural, optical and compositional characteristics of the film. At 10 kGy dose, dislocation density (DD), strain, crystallites per unit surface area (CPSA), specific surface area (SSA) of anatase phase (1 0 1) of the film were decreased abruptly, conversely, crystal size and morphology index (MI) were increased at t...
Source: Results in Physics - November 27, 2018 Category: Physics Source Type: research

Electronic transport and dynamical polarization in bilayer silicene-like systems
Publication date: December 2018Source: Results in Physics, Volume 11Author(s): Chen-Huan WuAbstractWe investigate the semiclassical electronic transport properties of the bilayer silicene-like systems in the presence of charged impurity. The trigonal warping due to the interlayer hopping, and its effect to the band structure of bilayer silicene is discussed. Besides the trigonal warping, the external field also gives rise to the anisotropic effect of the mobility (at finite temperature) which can be explored by the Boltzmann theory. The dynamical polarization as well as the scattering wave vector-dependent screening within...
Source: Results in Physics - November 27, 2018 Category: Physics Source Type: research

Breakdown of agreement between non-relativistic and relativistic quantum dynamical predictions in the non-relativistic regime
Publication date: March 2019Source: Results in Physics, Volume 12Author(s): Boon Leong Lan, Mehdi Pourzand, Rui Jian ChuAbstractTo study quantum dynamics in the non-relativistic regime, the standard practice is to use non-relativistic quantum mechanics, instead of the relativistic theory, because it is thought the approximate non-relativistic result is always close to the relativistic one. Here we present a theoretical argument that this expectation is not true in general. In addition, supporting numerical evidence for the free rotor and hydrogen atom also shows the agreement between the two theories can break down quickly...
Source: Results in Physics - November 27, 2018 Category: Physics Source Type: research

Comparison and analysis of wavelength calibration methods for prism – Grating imaging spectrometer
Publication date: March 2019Source: Results in Physics, Volume 12Author(s): Ci Sun, Mingjia Wang, Jicheng Cui, Xuefeng Yao, Jianjun ChenAbstractTo identify spectral information obtained from the prism - grating imaging spectrometer, it is essential to know the center wavelength for each spectral channel. In this letter, the wavelength calibration principle of push-broom imaging spectrometers is described, and a wavelength calibration device is built. The wavelength calibration of the self-developed prism-grating imaging spectrometer using the peak method and the gravity method is completed, and the center wavelength of eac...
Source: Results in Physics - November 27, 2018 Category: Physics Source Type: research

Study on influence of ambient temperature on biaxial stress and strength of flexible inflatable wing film
Publication date: March 2019Source: Results in Physics, Volume 12Author(s): Longbin Liu, Fan Hu, Zhenyu Jiang, Ting Liu, Yonggang XuAbstractWith advantages of small folding volume, light weight, simple structure, low cost and so on, the flexible inflatable wing has attracted many researchers' attention. However, the change of ambient temperature has a significant influence on the bearing stress of the flexible inflatable wing. Here the typical flat inflatable wing was taken as the object, and the biaxial stress analysis and the Mises stress of the influence of the ambient temperature of the inflatable wing were constructed...
Source: Results in Physics - November 27, 2018 Category: Physics Source Type: research

Evaluation of radiation absorption characteristics in different parts of some medicinal aromatic plants in the low energy region
Publication date: March 2019Source: Results in Physics, Volume 12Author(s): F. Akman, I.H. Geçibesler, A. Kumar, M.I. Sayyed, M.H.M. ZaidAbstractThe mass attenuation coefficients, effective atomic numbers and electron densities of different parts (aerial parts, root and flower) of four medicinal aromatic plants (Pimpinella tragium subsp. lithophila, Scutellaria orientalis subsp. orientalis, Tanacetum abrotanifolium and Stachys byzantina c. koch) have been determined experimentally using transmission beam method for gamma energies of 13.92, 17.75, 20.78, 26.34 and 59.54 keV. The obtained mass attenuation coefficien...
Source: Results in Physics - November 27, 2018 Category: Physics Source Type: research

Evaluation of the shielding parameters of alkaline earth based phosphate glasses using MCNPX code
Publication date: March 2019Source: Results in Physics, Volume 12Author(s): O. Agar, Z.Y. Khattari, M.I. Sayyed, H.O. Tekin, S. Al-Omari, M. Maghrabi, M.H.M. Zaid, I.V. KitykAbstractGlass systems of composition 16XO–3Al2O3–6CuO–20Na2O–55P2O5 (where X = Sr, Ca, Mg and Ba mol%) have been investigated to check its potential utilize as gamma ray shielding material. Different shielding quantities namely mass attenuation coefficient (µ/ρ), effective atomic number (Zeff), half value layer (HVL) and mean free path (MFP) have been evaluated using MCNPX code and XCOM program at different photon ...
Source: Results in Physics - November 27, 2018 Category: Physics Source Type: research

Driving force for the swelling of montmorillonite as affected by surface charge and exchangeable cations: A molecular dynamic study
Publication date: March 2019Source: Results in Physics, Volume 12Author(s): Jianfei Peng, Hao Yi, Shaoxian Song, Weiquan Zhan, Yunliang ZhaoAbstractSwelling of montmorillonite (MMT) is a nonnegligible factor in many industrial processes owing to its great ability to absorb water in interlayer space. It is not easy to determine whether the exchangeable cations or the MMT layers interacts much stronger with water molecules to provide the dominant driving force for the swelling of MMT. In this work, driving force for the swelling of montmorillonite as affected by surface charge and exchangeable cations has been investigated t...
Source: Results in Physics - November 27, 2018 Category: Physics Source Type: research

Numerical investigation on the stress corrosion cracking of FV520B based on the cohesive zone model
Publication date: March 2019Source: Results in Physics, Volume 12Author(s): Longhao Xiang, Xuesong Wei, Songying ChenAbstractTensile failure process of plane specimens and unilateral V-notched specimens is simulated basing on cohesive zone model (CZM). The internal stress in corrosion scales and film-induced stress in matrix increases with the increase of corrosion scale thickness. The thicker the corrosion scales are, the smaller the crack initiation strength is and the easier to initiate and propagate for stress corrosion cracks are. Meanwhile, with the thickness of corrosion scale increasing, the stress corrosion cracki...
Source: Results in Physics - November 27, 2018 Category: Physics Source Type: research

Modelling the heat transfer of an antioxidant coating heating system in wide temperature and simulation
Publication date: March 2019Source: Results in Physics, Volume 12Author(s): Dongyang An, Jingmin Dai, Peng Xiao, Yong Wang, Shuhao JiaAbstractMoSi2 is regarded as the most potential coating material in high-temperature application. The present aims to explore a feasible resistance direct heating technique for thermogravimetric heating in the wide-temperature range (773–2573 K) of MoSi2 coating. The physical heat transfer model is derived for the first time. Furthermore, based on the method of finite element analysis, heat distribution and heat transfer mechanism of the surface of MoSi2 coating material before and a...
Source: Results in Physics - November 27, 2018 Category: Physics Source Type: research

Underwater sound absorption performance of acoustic metamaterials with multilayered locally resonant scatterers
Publication date: March 2019Source: Results in Physics, Volume 12Author(s): Kangkang Shi, Guoyong Jin, Ruijie Liu, Tiangui Ye, Yaqiang XueAbstractAlthough the conventional locally resonant acoustic metamaterials (LRAMs) have shown better sound absorption performance in the low frequency band, the effective frequency range of the sound absorption performance is quite narrow relatively. To overcome this drawback, a novel type of multilayered locally resonant acoustic metamaterials (M-LRAMs) is proposed in this paper. The sound absorption performance of the proposed LRAMs can be broadened and enhanced by coupled resonance wit...
Source: Results in Physics - November 27, 2018 Category: Physics Source Type: research

H2S and SO2 adsorption on Pt-MoS2 adsorbent for partial discharge elimination: A DFT study
This study provides a theoretical basis to prepare Pt-MoS2 adsorbents for the SF6 decomposition components removal. (Source: Results in Physics)
Source: Results in Physics - November 27, 2018 Category: Physics Source Type: research

Demonstration of hydrogen sensing operation of AlGaN/GaN HEMT gas sensors in extreme environment
Publication date: March 2019Source: Results in Physics, Volume 12Author(s): G.H. Chung, T.A. Vuong, H. KimAbstractExtreme environment operation of hydrogen gas sensing was demonstrated by AlGaN/GaN high electron mobility transistor (HEMT) sensors under the condition of high temperature and energetic irradiation. The HEMT-type gas sensors were fabricated on AlGaN/GaN-on-Si platform and the gate area was functionalized with platinum (Pt) as a floating electrode for hydrogen sensing. AlGaN/GaN HEMTs maintained stable current-voltage (I-V) characteristics up to 350 °C before and after they were exposed to proton-irradiat...
Source: Results in Physics - November 26, 2018 Category: Physics Source Type: research

Physical properties of spinel-type superconductors CuRh2S4 and CuRh2Se4: A DFT study
Publication date: March 2019Source: Results in Physics, Volume 12Author(s): Md. Ibrahim Kholil, Md. Tofajjol Hossen BhuiyanAbstractThe structural, elastic, electronic, Vickers-Hardness, vibrational, Optical and thermodynamical properties of potentially technologically significant superconductors CuRh2S4 and CuRh2Se4 have calculated using density functional theory (DFT) with CASTEP code. The calculated lattice parameters and other properties have compared with available experimental values and found good agreement with them. The mechanical stability found for CuRh2S4 and CuRh2Se4 under Born stability conditions. Pugh’...
Source: Results in Physics - November 26, 2018 Category: Physics Source Type: research

Solution of different geometries reflected reactors neutron diffusion equation using the homotopy perturbation method
Publication date: March 2019Source: Results in Physics, Volume 12Author(s): Mohammed ShqairAbstractThe Homotopy Perturbation Method (HPM) proves continuous efficiency for a long time in solving linear and nonlinear mathematical differential equations and their applications in physical and engineering phenomena. In this work, HPM is applied to formulate new analytic solutions of time-independent neutron diffusion equation for different reflected reactor geometries, which is essential in describing the behaviour of the neutrons in the nuclear reactors. The reflector part is added to the core to minimize the critical dimensio...
Source: Results in Physics - November 25, 2018 Category: Physics Source Type: research

Experimental investigation on segregation and remelting behaviors of boron-containing steel with low carbon
Publication date: March 2019Source: Results in Physics, Volume 12Author(s): Hangyu Zhu, Jian Sun, Wei Wang, Weisheng Wang, Jialiu Lei, Zhengliang XueAbstractBoron in low carbon steel can improve hardenability and hot ductility remarkably. However, defects including cracks, internal half way cracks, and even breakouts commonly appear during the continuous casting process, due to the segregation and remelting behaviors of boron-containing steel. In the present investigation, morphology characteristics around the crack were observed by optical microscope (OM). The segregation and distribution of boron around grain boundary we...
Source: Results in Physics - November 25, 2018 Category: Physics Source Type: research

Biosynthesis of Ag nanoparticles using Cynara cardunculus leaf extract: Evaluation of their antibacterial and electrochemical activity
Publication date: December 2018Source: Results in Physics, Volume 11Author(s): Álvaro de Jesús Ruíz-Baltazar, Simón Yobanny Reyes-López, María de Lourdes Mondragón-Sánchez, Miriam Estevez, Angel Ramón Hernández-Martinez, Ramiro PérezAbstractThe present study reports the green synthesis of silver nanoparticles (AgNP’s) using Cynara cardunculus leaf extract in aqueous media. The silver ions reduction was carried out by the antioxidant component presents in the Cynara cardunculus. Transmission electron micrographs revealed that the synthesized ...
Source: Results in Physics - November 24, 2018 Category: Physics Source Type: research

Electric field-induced new structure transition of negative nematic liquid crystals confined to submicron cylinder cells
Publication date: December 2018Source: Results in Physics, Volume 11Author(s): Sibo Chen, Xuan Zhou, Zhidong ZhangAbstractBased on Landau-de Gennes theory, electric field-induced structure transition of negative nematic liquid crystals in submicron-confined cylinder cells was investigated. The easy orientation of the weak anchoring conditions on the cylindrical side surface was prescribed along the radial direction. When we kept the cell gap d unchanged and gradually increased the voltage U, system showed an unexpected structure transition. At a critical value of U = Uc, two-dimensional (2D) local order reconstruction ...
Source: Results in Physics - November 23, 2018 Category: Physics Source Type: research

All-d-metal equiatomic quaternary Heusler hypothetical alloys ZnCdTMn (T = Fe, Ru, Os, Rh, Ir, Ni, Pd, Pt): A first-principle investigation of electronic structures, magnetism, and possible martensitic transformations
Publication date: December 2018Source: Results in Physics, Volume 11Author(s): Yilin Han, Mengxin Wu, Minquan Kuang, Tie Yang, Xuebin Chen, Xiaotian WangAbstractA new series of Zinc-based all-d-metal equiatomic quaternary Heusler hypothetical alloys ZnCdTMn (T = Fe, Ru, Os, Rh, Ir, Ni, Pd, Pt) were designed, and their ground state, electronic structures, magnetism, and possible martensitic transformations, as well as the competition between the austenitic phase and the martensitic phase, were studied in this work. ZnCdTMn alloys have large magnetic moments, all larger than 3 µB, which mainly come from the Mn at...
Source: Results in Physics - November 23, 2018 Category: Physics Source Type: research

Dynamic modeling and characteristic analysis of the periodically coupled plate structure based on the dynamic stiffness method
Publication date: December 2018Source: Results in Physics, Volume 11Author(s): Chunyu Zhang, Hu Ding, Hailong Chen, Guoyong Jin, Tiangui Ye, Yukun ChenAbstractIn this paper, the dynamic model of periodically coupled plate structure is formulated by the dynamic stiffness method (DSM). Geometrical construction is assumed to vary periodically in the whole plate structure. According to the coupling condition, the whole periodic plate structure is divided into appropriate individual rectangular plates firstly. To the individual plate, the displacement fields both of in-plane and out-of-plane are derived from the governing equat...
Source: Results in Physics - November 23, 2018 Category: Physics Source Type: research

Mathematical methods via construction of traveling and solitary wave solutions of three coupled system of nonlinear partial differential equations and their applications
Publication date: December 2018Source: Results in Physics, Volume 11Author(s): Dianchen Lu, Aly R. Seadawy, Mujahid IqbalAbstractIn this research work, we applying the modification form of extended auxiliary equation mapping method on three couple system of nonlinear ovulation equations which have odd and even partial derivatives. We investigated the new exact traveling and solitary wave solutions of coupled Whitham-Broer-Kaup, (2 + 1)-dimensional Broer-Kaup-Kupershmit and Drinfel’d-Sokolow-Wilson equations. We applied successfully this new method and obtained the new form of exact traveling and solitary wave sol...
Source: Results in Physics - November 23, 2018 Category: Physics Source Type: research

Morphology evolution of self-organized porous structures in silicon surface
Publication date: March 2019Source: Results in Physics, Volume 12Author(s): Joon-Gon Son, Jung Won Choi, Okkyun Seo, Do Young Noh, Do-Kyeong KoAbstractWe have investigated the morphology evolution of silicon surface by laser irradiation. A pulsed ns-laser interaction with silicon in aqueous medium can produce self-organized microporous concave cell array structure without any chemicals and auxiliary equipment. Low radiant power was applied to the photo-induced non-thermal silicon surface modification. At the early stage, hemispherical patterns of 2 ∼ 3 µm were formed, maintaining a constant distance from each...
Source: Results in Physics - November 23, 2018 Category: Physics Source Type: research

Characterization of beam quality of unstable laser beams with the multiple hyperbolas method
Publication date: March 2019Source: Results in Physics, Volume 12Author(s): Lingqiang Meng, Qingqing Kong, Kunhao Ji, Zhigang Han, Hua Shen, Rihong ZhuAbstractIn this paper, the multiple hyperbolas method is proposed for characterizing the beam quality of unstable laser beams. Based on the traditional beam quality analyzer equipment, the proposed method captures multiple intensity images at every measurement positions. Afterward, three different hyperbolas are fitted according to the widths of laser intensities. With the fitted hyperbolas, three parameters, which include the average beam quality factor (Maver2) and variati...
Source: Results in Physics - November 23, 2018 Category: Physics Source Type: research

A model for predicting the temperature field during selective laser melting
Publication date: March 2019Source: Results in Physics, Volume 12Author(s): Yang Du, Xinyu You, Fengbin Qiao, Lijie Guo, Zhengwu LiuAbstractTo solve the problem that the thermal behavior of powder bed during SLM process is difficult to be analyzed by direct test measurement, a model for predicting the temperature field of AlSi10Mg molten pool in SLM process was established based on the finite element method. In the prediction model, the thermal properties of the material and the variation of laser power absorptivity with temperature were taken into account; the laser heat source was regarded as a 3D Gaussian body heat sour...
Source: Results in Physics - November 23, 2018 Category: Physics Source Type: research

Approximate solutions of the Dirac equation with Coulomb-Hulthén-like tensor interaction
Publication date: December 2018Source: Results in Physics, Volume 11Author(s): C.A. Onate, O. Adebimpe, A.F. Lukman, I.J. Adama, E.O. Davids, K.O. DopamuAbstractThe solutions of spin and pseudospin symmetries with Trigonometric scarf potential are obtained in the presence of a new tensor interaction which breaks down the energy degeneracies in both symmetries leading to atomic stability. The nonrelativistic equation is obtained by taking the nonrelativistic limit of the spin symmetry. A simplified condition for energy equation for Formula method for special case is also given. Finally, we calculated Fisher information for ...
Source: Results in Physics - November 22, 2018 Category: Physics Source Type: research

Evaluation of radioprotection properties of some selected ceramic samples
In this study, the gamma radiation attenuation features of barium zirconat, barium titanate (IV), magnesium nitride, barium pyrophosphate and silicon carbide were studied using the narrow beam geometrical setup in the energy range of 81 keV–1333 keV. The mass attenuation coefficients have been measured and then used to obtain half value layers, mean free paths and effective atomic numbers of the present materials. It is found that the change in the mass attenuation coefficient is considerable for low photon energies (between 81 and 276 keV), whereas the change in this parameter is comparatively small between 30...
Source: Results in Physics - November 22, 2018 Category: Physics Source Type: research

A prediction model for the slot depth of high pressure water jet
Publication date: December 2018Source: Results in Physics, Volume 11Author(s): Yongjiang Zhang, Quanle ZouAbstractCoal mines in China are characterized by low permeability, and hydraulic slotting is an effective technique to increase the gas permeability of coal. However, the slot depth cannot be accurately determined, which results in the layout parameters of the slotted borehole being empirically designed. In this paper, based on the law of momentum conservation, the velocity distribution law at the cross section of the water jet was derived. Based on the linear relationship between water jet impact power and the erosion...
Source: Results in Physics - November 22, 2018 Category: Physics Source Type: research

Properties of the finite Airy beam propagating in the misaligned slab system with a rectangular aperture
Publication date: December 2018Source: Results in Physics, Volume 11Author(s): Long Jin, Qiang Zhang, Zhiqiang YangAbstractIn this letter, we deduce the approximate analytical formula for the finite Airy beam propagating in the misaligned slab system with a rectangular aperture by using the generalized Huygens-Fresnel integral equation, the light transfer matrix and expanding the hard-edged rectangular function into a finite sum of complex Gaussian function. The particular cases of this beam propagating in the apertured aligned slab system, unapertured misaligned slab system and unapertured aligned one are further illustra...
Source: Results in Physics - November 22, 2018 Category: Physics Source Type: research

Electronic band structure of InAs/InAsSb type-II superlattice for HOT LWIR detectors
Publication date: December 2018Source: Results in Physics, Volume 11Author(s): T. Manyk, K. Michalczewski, K. Murawski, K. Grodecki, J. Rutkowski, P. MartyniukAbstractThe InAs/InAs1−xSbx type-II superlattices (T2SLs) grown on GaSb buffer layer and GaAs substrates have recently been applied for detectors for long wavelength infrared (LWIR) range and high operating temperature (HOT) conditions. The detailed modeling of T2SLs minibands structure required for detector’s design optimization process relies on accurate knowledge of the InAs1−xSbx bandgap and band edge position. The k∙p (8 × 8 method)...
Source: Results in Physics - November 22, 2018 Category: Physics Source Type: research

Optimizing the design of an embedded grating polarizer for infrared polarization light field imaging
Publication date: March 2019Source: Results in Physics, Volume 12Author(s): Siyuan Shen, Yuan Yuan, Zhaohui Ruan, Heping TanAbstractA silica-based embedded aluminum grating polarizer suitable for a near- and mid-infrared light field camera is investigated to fully utilize the direction information recorded by the detector in the light field camera. A grating with good polarizer performance was obtained by using the finite-difference time-domain (FDTD) method to simulate and optimize the structural parameters affecting the performance. The optimized structure reaches TM transmission efficiency exceeding 84% and extinction r...
Source: Results in Physics - November 22, 2018 Category: Physics Source Type: research

Detection of high-order Lamb waves using an end-face injection of ultrasonic pulses
Publication date: March 2019Source: Results in Physics, Volume 12Author(s): Jesus Manzanares-Martinez, Carlos Ivan Ham-Rodriguez, Maria Elena Zayas, Betsabe Manzanares-MartinezAbstractIn this work, we report the time-of-flight detection of high-order Lamb waves by using an end-face injection of ultrasonic pulses in plates. We used two piezoelectric transducers attached to the opposite edges of a rectangular plate. We applied the Short Time Fourier Transform (STFT) to determine the time-of-flight. We compare the contours of the STFT on the time-frequency spectrogram with the theoretical time-of-flight. This technique define...
Source: Results in Physics - November 22, 2018 Category: Physics Source Type: research

Fabrication of Ni, Cr, W reinforced new high alloyed stainless steels for radiation shielding applications
In this study, three types of high alloyed stainless-steel samples were produced. Before the production, GEANT4 Monte Carlo simulation toolkit was used to estimate the total fast neutron macroscopic cross sections and gamma mass attenuation coefficients. The hot-pressing process and the powder metallurgy method were applied. We tested samples’ chemical and mechanical strength. Samples were exposed to both gamma rays and fast neutrons. The obtained simulation and experimental results for both neutron and gamma radiation are compatible. According to the simulation and experimental results, neutron shielding capacity of...
Source: Results in Physics - November 22, 2018 Category: Physics Source Type: research