bluuebunny/crossref_metadata_2025_split huggingface dataset:
Investigation of the Pygmy Dipole Resonance in photon scattering experiments
Authors: Müscher Miriam , Isaak Johann , Savran Deniz , Schwengner Ronald , Wilhelmy Julius , Zilges Andreas 
Published: December 2020

Abstract
The Pygmy Dipole Resonance (PDR) is the dominating electric dipole excitation below and around the particle separation threshold and exhausts only a few percent of the energy-weighted sum rule. Nevertheless, it may have some impact on reaction rates in nucleosynthesis processes. Therefore, investigations to get more insights in this excitation mode are crucial. A common approach to study the PDR of atomic nuclei is the Nuclear Resonance Fluorescence method (NRF) which bases on real-photon scattering. Absolute cross sections, spin and parity quantum numbers are determined in a model-independent way if suited experimental setups are used. In general, there are two complementary NRF experiments which are presented in this paper.
Lifetime determination via the particle-γ coincidence Doppler-shift attenuation method
Authors: Prill S , Bohn A , Everwyn V , Färber M , Hennig A , Kluwig F , Petkov P , Scholz P , Spieker M , Weinert M , Wilhelmy J , Zilges A 
Published: December 2020

Abstract
This paper illustrates the principle of the Doppler-shift attenuation method (DSAM) using particle-γ coincidences, a method for determining lifetimes of excited nuclear levels in the range of few femtoseconds up to one picosecond. The coincident detection holds several advantages towards conventional DSAM experiments, such as the elimination of background and feeding transitions. Using the experimental data on 94Zr, the concept of the (p,p’γ) DSAM analysis is presented. Additional experimental results are highlighted.
Sensitivity of core+n potential on configuration mixing in ground state of neutron-rich exotic nuclei
Authors: Singh Jagjit , Horiuchi W. 
Published: December 2020

Abstract
We study the configuration mixing in the ground state of the neutron-rich exotic nuclei. The results for weakly-bound two-neutron halo nuclei 11Li and 22C, and the two-neutron unbound nucleus 26O are reported. For the present study, we use a three-body (core + n + n) structure model developed for describing the two-neutron halo system by explicit coupling of unbound continuum states of the subsystem (core + n). We use a density-dependent contact-delta interaction to describe the neutron-neutron interaction and its strength is varied to fix the binding energy. We report the two-neutron correlations in the ground state of these systems.
Exploring the latest quark-meson coupling model for finite nuclei
Authors: Martinez K L , Thomas A W , Stone J R , Guichon PAM 
Published: December 2020

Abstract
The quark-meson coupling (QMC) model describes atomic nuclei on the basis of the quark structure of nucleons and their self-consistent change as they interact with each other in the nuclear medium. The model has been successfully applied to even-even nuclei across the entire nuclear chart and results were comparable to other existing models despite having fewer adjustable parameters. Nuclear matter properties derived from the model are also within the widely used range of values. In this paper, we explore the latest version of the model, QMCπ-II. We put some emphasis on QMC predictions for neutron skin thickness which will be the subject for experiments in the near future. QMCπ-II predicts a value of around 0.15 and 0.16 fm for 48Ca and 208Pb, respectively, with the slope of symmetry energy at around 40 MeV.
Spectroscopy of 16B from quasi-free (p,pn) reaction with 17B
Authors: Yang Z. H. , Kubota Y. , Corsi A. , Authelet G. , Baba H. , Caesar C. , Calvet D. , Delbart A. , Dozono M. , Feng J. , Flavigny F. , Gheller J.-M. , Gibelin J. , Giganon A. , Gillibert A. , Hasegawa K. , Isobe T. , Kanaya Y. , Kawakami S. , Kim D. , Kiyokawa Y. , Kobayashi M. , Kobayashi N. , Kobayashi T. , Kondo Y. , Korkulu Z. , Koyama S. , Lapoux V. , Maeda Y. , Marqués F. M. , Motobayashi T. , Miyazaki T. , Nakamura T. , Nakatsuka N. , Nishio Y. , Obertelli A. , Ohkura A. , Orr N. A. , Ota S. , Otsu H. , Ozaki T. , Panin V. , Paschalis S. , Pollacco E. C. , Reichert S. , Roussé J.-Y. , Saito A. T. , Sakaguchi S. , Sako M. , Santamaria C. , Sasano M. , Sato H. , Shikata M. , Shimizu Y. , Shindo Y. , Stuhl L. , Sumikama T. , Sun Y. , Tabata M. , Togano Y. , Tsubota J. , Uesaka T. , Yasuda J. , Yoneda K. , Zenihiro J. 
Published: December 2020

Abstract
Spectroscopy of 16B plays an essential role in understanding the halo structure in 17B, but very limited knowledge has so far been obtained. We have carried out a kinematically complete measurement on the spectroscopy of 16B by using quasi-free (p,pn) reaction on 17B. The level scheme of 16B up to 5 MeV was made clear for the first time.
The 3D Nuclide Chart
Authors: Simpson E. C. 
Published: December 2020

Abstract
We present an overview of The 3D Nuclide Chart, a new online nuclide chart designed for producing high quality 3D nuclide chart images for use in publications, presentations, education and outreach. An historical overview of the design of nuclide charts is given, followed by a description of The 3D Nuclide Chart itself.
Theragnostics - Alternative production of terbium isotopes at the University of Birmingham using an MC40 cyclotron
Authors: Trinder R. R. , Kokalova Tz. , Parker D. J. , Wheldon C. , Phoenix B. , Ivanov P. , Russel B. , Webster B. , Regan P. , Robinson A. , Cullen D. , Pells S. , Allen R. , Pirrie S. , Turner A. , Santa Rita P. 
Published: December 2020

Abstract
In this work alternative methods for the production of terbium isotopes, and in particular 152Tb and 155Tb, have been investigated. These isotopes, which could be used for theragnostics, have been produced using an alpha and a proton beam incident on europium and gadolinium targets, respectively. The experimental results have been compared with the predicted cross-sections, calculated using TALYS and PACE4 code.
The influence of the cross-sectional shape of the body on the parameters of flexural-gravity waves during under-ice motion
Authors: Zemlyak V L , Kozin V M , Vasilyev A S , Rogozhnikova E G 
Published: December 2020

Abstract
When solving the problem of a submarine movement near the lower surface of the ice cover, the hull of the submarine, which has a complex geometry, is usually changed to a body of rotation, having a simplified form while maintaining basic characteristics. In turn, the cross-sectional shape of the hull can have a significant effect on the parameters of flexural-gravity waves generated by the movement of the submarine. The paper describes an experimental study of the influence of the cross-sectional shape of the models of submerged bodies having the same elongation, displacement and cross-sectional area, and a different ratio of the hull height to their width on the ice-breaking ability of flexural-gravity waves. It is analysed how the poorly hydrodynamic form of a submerged body affects the parameters of flexural-gravity waves. The nature of ice failure during the movement of submerged bodies of different forms is defined.
Some pioneering research in laboratory simulation of scaled astrophysical phenomena by Russian physicists
Authors: Baranov P F , Zatonov I A 
Published: December 2020

Abstract
The review about the problems of astrophysical phenomena pioneering researching by Russian recognized physicists – S.Anisimov, I.V.Minin, O.V.Minin, V.F.Minin and A.Velikovich - is carried out. For the first time, a mode of hypercumulative collapse of a conical cavity was proposed for the formation of an ultra-high-speed plasma jet. The description of “cumulative plasma jets” is presented. The main parameters of the cumulative plasma jet and the results of laboratory studies on the creation of a hyper cumulative plasma jet are described. It was shown that the proposed mechanism allows one to obtain record characteristics of such a jet, which have not been surpassed so far. Test data description of the numerical simulation of the inter action between plungers and a conic cavity on the explosive initiation of the D-D reaction with the aid of aluminum plungers is discussed. The mechanisms of the plunger surface acceleration are described. The generation of the Mach configuration of shock waves in the target was also used for the explosive production of wurtzite with a record yield of the mass of the synthesized material and to focusing of the shock waves in water using plane diffractive optics.
The study of pressing mechanically activated niobium and silicon powder mixtures
Authors: Shkoda O A 
Published: December 2020

Abstract
The paper presents the results obtained in the study of the pressing process of mechanically activated powder mixtures of the niobium – silicon system. Pressing often precedes the process of self-propagating high-temperature synthesis and the initial density of the compressed samples can have a significant impact on the regime of subsequent high-temperature combustion, on the composition and properties of the final product (niobium silicide). The obtained dependences of porosity on the time of mechanical activation showed the features of pressing, which are associated with the formation of layered agglomerates in the process of mechanical activation. It was found that the compression curves of mechanoactivated powders differ qualitatively from the standard compression curves of fine powders. The paper considers the influence of mechanical activation time on the density of the compressed samples obtained by varying the pressing pressure and the time spent under the press. The relationship between the density of compresses and layered agglomerates, which are formed during mechanical activation, is considered.
Calculation of gas flow through the flow of axial turbocompressors
Authors: Lubysheva A I , Potashev A V , Potasheva E V 
Published: December 2020

Abstract
When designing centrifugal compressors, much attention is paid to increasing the efficiency of the compression process with a wide range of changes in the operating modes of the stages. In this regard, the role of methods that make it possible to calculate the characteristics taking into account the compressibility of the gas flow through the elements of the flow path increases. In this work, the development of the method for solving the second two-dimensional problem is given, which makes it possible to calculate the subsonic gas flow. In this case, impellers with both single-row and multi-row blade elements are considered.
Investigation of the turbulent structure in a flame and the effect of small infrasonic exposure on it using IR thermography methods
Authors: Loboda E L , Agafontsev M V , Klimentiev A S , Kasymov D P , Loboda Y A , Martynov P S , Reyno V V 
Published: December 2020

Abstract
The paper presents the results of studies of gasoline and diesel fuel diffusion combustion using IR thermography methods. Experimental results of the effect of small amplitude pressure pulsations with various frequencies on the spectra of temperature changes in the flame and other characteristics are obtained. It is shown that the effect of pressure pulsations with certain frequencies leads to a change in the flame height, fuel burning-up rate and the appearance of characteristic frequency maximum in the spectra of temperature changes in the flame.
Modification of the fictitious absorption method for solving integral equations of mixed problems for arbitrary simply connected regions
Authors: Telyatnikov I S , Pavlova A V , Kapustin M S 
Published: December 2020

Abstract
We presented a modification of the fictitious absorption method (FAM), which is used to solve integral equations (IE) of mixed dynamic problems. The method was generalized for the case of the defector stamp occupying a non-convex in plane area. For regions of complex configuration, we assumed the possibility of their representation as a union of convex bounded closed regions, possibly with common boundary sets. We proposed to modify the method in terms of the selection of basis functions that are present in the solution only under the signs of integral operators. The derivatives of Dirac delta functions with supports in the boundary sets of the considered regions were chosen as such. A more complex form of the functions used provided a more convenient form of the solution. As an illustration of the modified MFA use in the basis functions we present solutions of integral equations of the first kind for an axisymmetric problem of steady-state vibrations of an elastic layer with a clamped bottom edge under the action of a surface load and a horizontally oriented internal source.
Effectiveness of Seismically Resistant Braced Frames to Blast Loading
Authors: Kapoor Akshay , Setia Saraswati 
Published: December 2020

Abstract
The increment in the tally of terrorist radicalisation from the past time has exhibited that the consequence of blast loads on structures is a crucial matter that should be taken into cogitation. This paper considers the effect of blast load on seismically designed framing systems namely Moment Resisting Frame (MRF), Concentric Braced Frame (CBF), Eccentric Braced Frame (EBF) and Buckling Restraint Braced Frame (BRBF). The bracings are one of the efficient lateral load resisting systems and their behaviour is observed under the blast loading. The burst load is estimated to be an unconfined surface burst explosion on front face of the structure. Comparative analysis of storey displacement among different framing systems is performed. Failure of members is studied through the analysis of plastic hinge formation. The results indicate that braced frames perform better when exposed to such kind of impact load. Buckling Restraint brace (BRB) exhibited higher level of resistance to blast loading due to its ability to yield in both compression and tension.
Shear Mode Damper Testing Using Flake Shape Based Magnetorheological Fluids
Authors: Patel D. M. , Bhatt D. V. , Upadhyay R. V. 
Published: December 2020

Abstract
Use of anisotropic iron particles in the magnetorheological (MR) fluid having a high yield stress is a challenge as it increases the viscosity of the fluid in off-state. In this clause, a novel flake shaped iron powder based MR fluid with high yield stress is synthesized and used in shear mode MR damper (SMMD). MR damper design is optimized using fluid properties and Bingham model. Damping performance of newly synthesized MR fluid damper is at par with the available friction based damper used in front loaded washing machine. The unique feature of this design is minimal volume of the fluid (1.5 ml) required to achieve damping force of 50N. Effect of different volume percentage of particles in MR fluid is evaluated in terms of damping force. Effect of testing parameters like displacement and frequency of excitation on damping force was evaluated. Effect of settling of particle on damper performance is discussed in this work. It shows that the flakes shaped-based MR fluid show better stability against gravity. The smaller quantity of present flake shaped-based MR fluid will reduce the cost of shear mode damper.
Surface Characteristics Enhancement of Biocompatible Mg Alloy AZ31B by Cryogenic Milling
Authors: Chhetri Subham , Tariq Mohammad , Mohapatra Stephen Dilip , Vikali Sumi V , Zhimomi Alomi P , Davis Rahul , Singh Abhishek 
Published: December 2020

Abstract
The mechanical, physical and chemical properties of Magnesium alloys have undoubtedly proven compatible and efficient for their aid in biomedical sector. Magnesium tends to corrode rapidly in in-vivo environment limiting its efficiency and life expectancy as a biomedical implant. This has led to the study and research of the properties of these excellent materials in order to increase its corrosion resistivity property. In the recent years through thorough research and study it has been proven that cryogenic machining is an efficient technique for surface integrity improvements which plays a vital role in the increment of corrosion resistivity of a material. This work in particular is one of the studies in which the milling operation is carried out on a CNC milling machine on the commercially available AZ31B Magnesium alloy by a cemented carbide tool under two different milling environments namely wet and cryogenic. Different machining factors were opted and comparative investigation was conducted between the two machining conditions. The post machined results were further compared for minimum surface roughness. The comparative analysis presented a better surface finish in case of cryogenic milling than wet milling.
Reduction of positional error in a path of a 2 DOF serial planar manipulator
Authors: Tatte R N , Thorat H T , Deosant P V 
Published: December 2020

Abstract
Tracing a path is one of the major applications of a robotic arm. In this paper, a 2 DOF serial planar manipulator which traces the desired path is discussed. Quite often the path is defined by accuracy points lying on it. To trace these points, joints of links of the manipulator are required to be given as a coordinated inputs θ
1 and θ
2 (input angles of two links). This path is traced with a desired speed indicated by the time at which the accuracy points are reached.
In open-loop control, this is achieved by giving time, voltage/current input to driving motors. This path is determined based on the torque, acceleration, velocity of the linkages and individual joints. Hence the relationship between time and joint angles is necessary. When joint angles θ
1 and θ
2 are interpolated between two accuracy points, precise coordinated motion is not possible. Some deviation from the desired path will occur. This is the positional error for tracing the path. Here, analysis has been done to find the effect of degree of interpolation on the positional error.
Bending analysis of a sandwich plate with elliptical/circular cutout
Authors: Lal Achchhe , Sutaria B.M , Kumar Rahul 
Published: December 2020

Abstract
Applications of sandwich plate as light weight structural member rapidly increased since last two decades because of its higher flexural rigidity to weight ratio. From aerospace vehicle to racing car, from giant submarine to small boat, from bicycle to high speed train all these weight sensitive areas have various parts made up by composite sandwich plates. Sometimes these members have hole of various shape for access of internal parts, lighting, ventilation etc. due to presence of these geometrical discontinuities in the form of hole, the structure gets more vulnerable to failure. During functioning, these parts usually acted upon by transverse force which may cause large deflection in the member or failure of the structure. Therefore, proper analysis of these structural member is desired for efficient and safe design. In the present work bending analysis of sandwich plate with elliptical and circular hole is carried out using finite element based first order shear deformation theory. A MATLAB program is developed for the present analysis. The efficiency of the program is found good as present results shows good agreements with the already published results.
Post-buckling analysis of the shape memory polymer sandwich composite beam under dynamic temperature variation
Authors: Lal Achchhe , Markad Kanif 
Published: December 2020

Abstract
Post-buckling analysis of the shape memory polymer sandwich composite (SMPSC) beam under HSDT utilizing von Karman kinematics using FEM is performed in present analysis. The aim of the study is to develop a model which accurately perform the buckling analysis. The nondimensional critical buckling load (NCBL) evaluation under the action of inplane uniform load with different boundary conditions (BC), plate thickness ratio, under dynamic temperature variation for SMPSC. The study clearly reveled the differentiation between SMPC and SMPSC beam.
ABAQUS Implementation to Analyze the Stress Intensity Factor for Laminated Composite Plate
Authors: Lal Achchhe , Vaghela M. B. 
Published: December 2020

Abstract
The objective of this work is Abaqus implementation to analyze the effect of fibre orientation angle on stress intensity factor for Single Edge Notched (SEN) 3D laminate composite plate under tensile loading by various cases. The Abaqus software is used to analyze the various problems through the extended finite element method (XFEM). The effects of various fibre orientation angles on Sress Intensity Factor (SIF), Von Misses stress and displacement are also investigated. The presented work would be useful for enhancing the use of Abaqus software to analyze the composite structure with crack and other discontinuities under various conditions.
Finite element analysis of AISI 8620 alloy spur gear hot forging
Authors: Kanani J B , Lalwani D I 
Published: December 2020

Abstract
Among all manufacturing processes, a forging process has a remarkable position in which parts with desired mechanical properties and minimum wastage of material can be produced. Despite of mentioned advantages, forging process has few drawbacks such as high tonnage capacity machineries, expensive dies, high initial investment and die failure. The overall cost of the forging process directly depends upon the required forging load, ejection load and dies arrangements. In this paper, Finite Element Analysis (FEA) of a spur gear forging process made of low carbon alloy steel (AISI 8620) is carried out. Two load reduction methods (elastically attached die and relief hole) are simultaneously used and analyzed using DEFORM- 3D software. The required forging load is compared between non-elastic die arrangements and elastic die arrangements with the relief hole. Velocity distribution is also discussed at nine different locations.
Effect of rotational speed on structural and optical properties of spin coated SnO thin films
Authors: Priyanka L , Hymavathi B , Kumar B Rajesh 
Published: December 2020

Abstract
Tin monoxide films were synthesized by sol-gel process followed by spin coating at the spinning speeds from 1000 to 3000 rpm. X-ray diffraction profiles of the films exhibits amorphous nature. Surface morphological and elemental confirmation of SnO films were studied by scanning electron microscope and energy dispersive of X-ray spectroscopy. The optical transmittance of the films had an increment from 60 to 72% with the increase of spinning speed from 1000 to 3000 rpm. The band gap of SnO thin films varied from 2.96 to 3.52 eV with an increment in rotational speed due to Burstein-Moss (B-M) effect. The estimated particle size from the optical absorbance spectra using effective mass approximation method is decreased from 23.6 nm to 11.6 nm with an increment in the spin speed from 1000 to 3000 rpm.
Heat Transfer Characteristics of Water Cooled Minichannel Heat Sink Using Different Fluid Flow Geometries
Authors: Makam Jugal Shrinivas , Totla Nilesh Balkishanji 
Published: December 2020

Abstract
Efficient heat transfer for compact electronic components has become a major need in these days. For this purpose, we require a minichannel heat sink with a liquid cooling system that makes these requirements as possible. In this work, both analytical and CFD investigations have been carried out to calculate the heat transfer performance of a minichannel heat sink consisting of cross sections with three different shapes of a rectangular, trapezoidal and hexagonal in which working fluid is made to flow. The simulation is conducted with water as the working fluid for three different shapes with Reynolds number ranging from 200 to 1000 and analyzed numerically for the single-phase laminar flow with the boundary condition of constant heat flux. The channel dimensions and inlet velocity effects on the Nusselt number, pressure drop, and heat transfer coefficient are studied. The 3D steady-state, laminar flow, and governing equations of heat transfer are solved using the finite volume method by commercial ICEM-Fluent software.