bluuebunny/crossref_metadata_2025 huggingface dataset:
Characterization of optical and radiation shielding behaviors of ferric oxide reinforced bismuth borate glass
Authors: Henaish A M A , Issa Shams A M , Zakaly Hesham M H , Tekin H O , Abouhaswa Aly
Published: April 2021

This study aimed to investigate the ferric oxide effect on optical and radiation shielding behaviors of bismuth borate glasses. Gamma-ray attenuation competencies of six glass samples along with optical properties were investigated in terms of their utilization suitability as a shield or personal protection equipment in industrial and medical fields. The chemical composition (60-x) B2O3 + 20Bi2O3 + 20Li2O+xFe2O3 with different Fe2O3 concentrations were prepared using the melt-quenching technique. Gamma-ray attenuation competencies of six glass samples along with optical properties were investigated in terms of their utilization suitability in industrial and medical fields. The outcomes of optical investigations indicated that direct optical band gap (Eg direct) decrease from 5.11 eV to 4.82 eV, while for indirect transition (Eg indirect) decrease from 4.62 eV to 3.79 eV, with increasing Fe2O3 concentrations. To determine the radiation shielding performance, mass attenuation coefficients (μ
m) of samples were calculated using FLUKA code and XCOM program between 0.015–15 MeV photon energy range. Accordingly, gamma shielding parameters such as mass (MAC) and linear (LAC) attenuation coefficients, half-value layer (HVL), tenth value layer (TVL), mean free path (MFP), effective atomic numbers (Zeff), electron density (Nel), and fast neutron removal cross sections (ΣR) were evaluated for all glass samples. The results showed that increasing Fe2O3 concentration in glass structure increased the MAC and Zeff. The Fe-10 was reported with the lowest HVL values in addition to the highest MAC and Zeff values.
Study of fuzzy fractional order diffusion problem under the Mittag-Leffler Kernel Law
Authors: Arfan Muhammad , Shah Kamal , Ullah Aman , Abdeljawad Thabet
Published: April 2021

Our research work is composed of designing the scheme for computation of some analytical results for fractional order fuzzy diffusion problem under Atangana-Baleanu and Caputo()fractional differential operator. We have obtained the required series type solution by using the Laplace transform along with decomposition techniques. By applying the said method, we have decomposed the required whole quantity into small parts and calculate the series solution for the first few terms We have tested the develop algorithm by three different problems of one, two and three dimensions. The numerical simulations confirm that the solutions of the problems converge to their exact values at the integer-order. Further, we conclude that the fractional-order derivative yields a complete spectrum of fuzzy solutions.
Local primordial non-Gaussianity in the relativistic galaxy bispectrum
Authors: Maartens Roy , Jolicoeur Sheean , Umeh Obinna , De Weerd Eline M. , Clarkson Chris
Published: April 2021

Next-generation galaxy and 21cm intensity mapping surveys will rely on a combination of the power spectrum and bispectrum for high-precision measurements of primordial non-Gaussianity. In turn, these measurements will allow us to distinguish between various models of inflation. However, precision observations require theoretical precision at least at the same level. We extend the theoretical understanding of the galaxy bispectrum by incorporating a consistent general relativistic model of galaxy bias at second order, in the presence of local primordial non-Gaussianity. The influence of primordial non-Gaussianity on the bispectrum extends beyond the galaxy bias and the dark matter density, due to redshift-space effects. The standard redshift-space distortions at first and second order produce a well-known primordial non-Gaussian imprint on the bispectrum. Relativistic corrections to redshift-space distortions
generate new contributions to this primordial non-Gaussian signal, arising from: (1) a coupling of first-order scale-dependent bias with first-order relativistic observational effects, and (2) linearly evolved non-Gaussianity in the second-order velocity and metric potentials which appear in relativistic observational effects.
Our analysis allows for a consistent separation of the
relativistic `contamination' from the primordial signal, in order to avoid biasing the measurements by using an incorrect theoretical model. We show that the bias from using a Newtonian analysis of the squeezed bispectrum could be Δ fNL∼ 5 for a Stage IV Hα survey.
A hybrid simulation of gravitational wave production in first-order phase transitions
Authors: Jinno Ryusuke , Konstandin Thomas , Rubira Henrique
Published: April 2021

The LISA telescope will provide the first opportunity to
probe the scenario of a first-order phase transition happening close
to the electroweak scale. In thermal transitions, the main
contribution to the GW spectrum comes from the sound waves
propagating through the plasma. Current estimates of the GW
spectrum are based on numerical simulations of a scalar field
interacting with the plasma or on analytical approximations — the
so-called sound shell model. In this work we present a novel setup
to calculate the GW spectra from sound waves. We use a hybrid
method that uses a 1d simulation (with spherical symmetry) to evolve
the velocity and enthalpy profiles of a single bubble after
collision and embed it in a 3d realization of multiple bubble
collisions, assuming linear superposition of the velocity and
enthalpy. The main advantage of our method compared to 3d
hydrodynamic simulations is that it does not require to resolve the
scale of bubble wall thickness. This makes our simulations more
economical and the only two relevant physical length scales that
enter are the bubble size and the fluid shell thickness (that are in
turn enclosed by the box size and the grid spacing). The reduced
costs allow for extensive parameter studies and we provide a
parametrization of the final GW spectrum as a function of the wall
velocity and the fluid kinetic energy.
Minimal Theory of Bigravity: construction and cosmology
Authors: De Felice Antonio , Larrouturou François , Mukohyama Shinji , Oliosi Michele
Published: April 2021

Following the path of minimalism in alternative theories of gravity, we construct the “Minimal Theory of Bigravity” (MTBG), a theory of two interacting spin-2 fields that propagates only four local degrees of freedom instead of the usual seven ones and that allows for the same homogeneous and isotropic cosmological solutions as in Hassan-Rosen bigravity (HRBG). Starting from a precursor theory that propagates six local degrees of freedom, we carefully choose additional constraints to eliminate two of them to construct the theory. Investigating the cosmology of MTBG, we find that it accommodates two different branches of homogeneous and isotropic background solutions, equivalent on-shell to the two branches that are present in HRBG. Those branches in MTBG differ however from the HRBG ones at the perturbative level, are both perfectly healthy and do not exhibit strong coupling issues nor ghost instabilities. In the so-called self-accelerating branch, characterized by the presence of an effective cosmological constant, the scalar and vector sectors are the same as in General Relativity (GR). In the so-called normal branch, the scalar sector exhibits non-trivial phenomenology, while its vector sector remains the same as in GR. In both branches, the tensor sector exhibits the usual HRBG features: an effective mass term and oscillations of the gravitons. Therefore MTBG provides a stable nonlinear completion of the cosmology in HRBG.
A search for ultrahigh-energy neutrinos associated with astrophysical sources using the third flight of ANITA
Authors: Deaconu C. , Batten L. , Allison P. , Banerjee O. , Beatty J.J. , Belov K. , Besson D.Z. , Binns W.R. , Bugaev V. , Cao P. , Chen C.H. , Chen P. , Chen Y. , Clem J.M. , Connolly A. , Cremonesi L. , Dailey B. , Dowkontt P.F. , Fox B.D. , Gordon J.W.H. , Gorham P.W. , Hast C. , Hill B. , Hsu S.Y. , Huang J.J. , Hughes K. , Hupe R. , Israel M.H. , Liewer K.M. , Liu T.C. , Ludwig A.B. , Macchiarulo L. , Matsuno S. , McBride K. , Miki C. , Mulrey K. , Nam J. , Naudet C. , Nichol R.J. , Novikov A. , Oberla E. , Prohira S. , Prechelt R. , Rauch B.F. , Ripa J. , Roberts J.M. , Romero-Wolf A. , Rotter B. , Russell J.W. , Saltzberg D. , Seckel D. , Schoorlemmer H. , Shiao J. , Stafford S. , Stockham J. , Stockham M. , Strutt B. , Sutherland M.S. , Varner G.S. , Vieregg A.G. , Wang N. , Wang S.H. , Wissel S.A.
Published: April 2021

The ANtarctic Impulsive Transient Antenna (ANITA) long-duration balloon
experiment is sensitive to interactions of ultrahigh-energy (E>1018 eV)
neutrinos in the Antarctic ice sheet. The third flight of ANITA, lasting 22
days, began in December 2014. We develop a methodology to search for
energetic neutrinos spatially and temporally coincident with potential source
classes in ANITA data. This methodology is applied to several source classes:
the potential IceCube-identified neutrino sources TXS 0506+056 and NGC 1068, flaring high-energy blazars reported by the Fermi All-Sky Variability Analysis, gamma-ray bursts, and supernovae. Among
searches within the five source classes, one candidate was identified as associated
with SN 2015D, although not at a statistically significant level. We proceed to place upper limits on the source classes. We further
comment on potential application of this methodology to more
sensitive future instruments.
Applying a global pulse disturbance to eliminate spiral waves in models of cardiac muscle*
Authors: Gao Jian , Gu Changgui , Yang Huijie
Published: April 2021

Removal of spiral waves in cardiac muscle is necessary because of their threat to life. Common methods for this removal are to apply a local disturbance to the media, such as a periodic forcing. However, most of these methods accelerate the beating of the cardiac muscle, resulting in the aggravation of the ventricular tachycardia, which directly threatens life. In the present study, in order to clear off spiral waves, a global pulse-disturbance is applied to the media based on three models of cardiac muscle. It is found that the spiral waves are eliminated and the frequency of the cardiac muscle is decreased in a short time, and finally, the state of the medium reaches the normal oscillation, which supports a target waves. Our method sheds light on the removal of spiral waves in cardiac muscle and can prevent the ventricular tachycardia as well as the ventricular fibrillation.x
Optical solitons supported by finite waveguide lattices with diffusive nonlocal nonlinearity*
Authors: Huang Changming , Deng Hanying , Dong Liangwei , Shang Ce , Zhao Bo , Suo Qiangbo , Zhou Xiaofang
Published: April 2021

We investigate the properties of fundamental, multi-peak, and multi-peaked twisted solitons in three types of finitewaveguide lattices imprinted in photorefractive media with asymmetrical diffusion nonlinearity. Two opposite soliton self-bending signals are considered for different families of solitons. Power thresholdless fundamental and multi-peaked solitons are stable in the low power region. The existence domain of two-peaked twisted solitons can be changed by the soliton self-bending signals. When solitons tend to self-bend toward the waveguide lattice, stable two-peaked twisted solitons can be found in a larger region in the middle of their existence region. Three-peaked twisted solitons are stable in the lower (upper) cutoff region for a shallow (deep) lattice depth. Our results provide an effective guidance for revealing the soliton characteristics supported by a finite waveguide lattice with diffusive nonlocal nonlinearity.
Silicon micropillar electrodes of lithiumion batteries used for characterizing electrolyte additives*
Authors: Hu Fangrong , Zhang Mingyang , Qi Wenbin , Zheng Jieyun , Sun Yue , Kang Jianyu , Yu Hailong , Wang Qiyu , Chen Shijuan , Sun Xinhua , Quan Baogang , Li Junjie , Gu Changzhi , Li Hong
Published: April 2021

The 〈 100 〉 crystal-oriented silicon micropillar array platforms were prepared by microfabrication processes for the purpose of electrolyte additive identification. The silicon micropillar array platform was used for the study of fluorinated vinyl carbonate (FEC), vinyl ethylene carbonate (VEC), ethylene sulfite (ES), and vinyl carbonate (VC) electrolyte additives in the LiPF6 dissolved in a mixture of ethylene carbonate and diethyl carbonate electrolyte system using charge/discharge cycles, electrochemical impedance spectroscopy, cyclic voltammetry, scanning electron microscopy, and x-ray photoelectron spectroscopy. The results show that the silicon pillar morphology displays cross-shaped expansion after lithiation/delithiation, the inorganic lithium salt keeps the silicon pillar morphology intact, and the organic lithium salt content promotes a rougher silicon pillar surface. The presence of poly-(VC) components on the surface of FEC and VC electrodes allows the silicon pillar to accommodate greater volume expansion while remaining intact. This work provides a standard, fast, and effective test method for the performance analysis of electrolyte additives and provides guidance for the development of new electrolyte additives.
Rotational Velocity and Dynamical Mass for the Nuclear Disk of the ULIRG Arp 220
Authors: Azeez Jazeel H. , Zghair Ammar A. , Fadhil Sadeem A. , Zainal Abidin Zamri
Published: April 2021

In this manuscript we use a very high spatial resolution CO (J = 6 - 5) data from Atacama Large Millimeter/Sub-millimeter Array (ALMA) focused to the center region of Arp 220, at distance D = 77.4 Mpc (1 arcsecond = 375 parsec). The CO emission is resolved efficiently by ALMA beam (0.43” x 0.26”). We use long-slit along different direction of our sample to study the kinematic properties of the warm molecular gas within the inner region of Arp 220. We find the observed position - velocity (PV) diagram for this galaxy from its emission line. The major part of the molecular gas in Arp 220 was located mainly in the east and west nucleus. We measure 0.23 × 1010 Mʘ dynamical mass in the central of this galaxy.
Synthesis, and Study the Electrical Properties of Conductive (PVA:PANI)/CuI Blend Composite
Authors: Hassan Ahmed A , Hammed Mohammed G
Published: April 2021

PVA:PANI/CuI thin film composites were prepared by adding (CuI) nanoparticles to the blend of the poly vinyl alcohol and conductive polyaniline with various concentrations (0, 2, 4, 6, and 8% wt) using the casting method technique on glass substrate at room temperature. The type, concentration of charge carriers, and Hall mobility (µH) had estimated from Hall measurement and shown that the polymer thin films before additive of CuI nanoparticles were positive Hall coefficient (P-type). While the polymer thin films for all concentration of CuI nanoparticles have negative Hall coefficient (n-type) except of sample with concentration 6 %wt was remained positive Hall coefficient (P-type). In D.C measurement, increasing of temperature value leads to reduce the electrical resistance, also the D.C conductivity of the thin film composites rises with increasing additive concentration of CuI nanoparticles. The activation energy values for PVA:PANI polymer blend composites decreased when the concentration of CuI nanoparticles increased. Alternating electrical conductivity (σac) increases when the frequency of all samples increases. While the alternating electrical conductivity (σac) remains constant at very low frequency.
Microwave Absorption Properties of PTFE Using T/R Rectangular Waveguide, Nicholson-Rose-Weir, and Finite Element Method
Authors: Yahya Salih Ethar , Khalid Alani Abd-Alrahman , Jawad Mohammed A. , Abbas Zulkifly
Published: April 2021

In this manuscript, the S-parameters, reflection and transmission coefficients, of PTFE at different thicknesses for microwave absorption applications were investigated in conjunction with WR90 T/R rectangular waveguide. Subsequently, the reflection and absorption shielding effectiveness SER
and SEA
values were calculated using the measured S-parameters values, in which an inversely proportional relation was found. Furthermore, using Nicholson-Rose-Weir (NRW) and Finite Element Method (FEM) approaches, the measured S-parameters were validated. Herein, the mean relative errors were calculated; in particular, it was found that the FEM delivers an upright agreement with the measured data in comparison to the utilized NRW. This suggests the usefulness of the FEM approach as a low-cost alternative for the actual laboratory investigation.
The Effect of Plasma Jet on Blood Components of Mice Infected With Diabetes
Authors: Majeed Neean F , Ali Alyaa H , Mazhir Sabah N , Hanon Marwa S
Published: April 2021

The diabetes can be induced by injecting “Alloxan” into animals. it shows a good response in animals specially in “mice, rabbits, mice, dog, and rats”. The drug dosage is between “90 and 200mg/kg of the body weight”. The “Alloxan” motivate “blood glucose” and the experimental animals shows response to the injected drug. The samples which are used in this study are mice male gender with age ranging between three and four months and weight (20-25)gm, these mice are injected with “Alloxan” with a dose of alloxan(200mg/kg) to study effect of alloxan on blood compounds (The cells of white blood, the cells of Red blood and platelets) and study the effect of plasma jet on the infected mice for different time exposure, the component of blood shows different response to the plasma jet effect the White Blood Cells (WBC) and the Platelets(PLT) approach the normal case in the 30 second, the Red Blood Cells (RBC) , HGB the concentration of hemoglobin in whole blood and (HCT) the ratio of red blood cells to the volume of blood plasma approach the normal case in 50 second, the (MCV) mean cell volume approach the normal value in 10 second.
Studying Inelastic Electron Scattering of Magnetic Form Factors M1 for 48Ca Nucleus Using Skyrme Interaction
Authors: Afar Omar Q , Majeed F Z
Published: April 2021

The M1 inelastic scattering form factors from 48Ca nucleus have been investigated through nuclear shell theory. The nuclear effective two body interaction fpbm of Richter has been utilized to generate the two body wave vectors with Harmonic oscillator wave function as a single particle wave function in Fp shell model space. Core polarization effect has been used to include the discarded space (core+ higher configuration) via model space with realistic interaction of Skyrme Sly5 to couple the model space active particles with the pair (particle-hole) excited in energy of 2ћω. Calculated results has been compared to available experimental data.
Annual Average Internal Dose Based on Alpha Emitters in Milk Sample
Authors: Kareem Hashim Abdalsattar , Mezher Hamza A. , Hadi Kadhim Suha , Abid Abojasim Ali
Published: April 2021

Natural radioactivity is common in the environment. As well as in geological formations such as soil, rock, air, water and plants. Which required extensive researches in many countries are due to the global interest in exposure to natural radioactivity. Ten different samples of milk collected from Iraqi markets were evaluated for concentration of alpha radioactivity (uranium concentration, effective radium content and radon concentrations) using CR-39. After exposure, the detectors were etched in a (NaOH) solution of normality (6.25 N) at a temperature of 70 °C for 8 hours. The tracks were calculated by the microscope track-counting system. At a rate of 0.171 ppm, uranium concentrations ranged between 0.079 – 0.263 ppm. While, the effective radium content varied from 53.724 - 178.47 mBq/kg with an arithmetic rate of 116.096 mBq/kg. The variation of the radon exhalation values for the mass unit and for the area unit was also observed between 0.406 - 1.349 mBq/kg.h and 3.076 -10.217 mBq/m
2.h, at a mean rate of 0.943 mBq/kg.h and 6.646 mBq/m2.h, respectively. The average of annual average internal effective dose (AAIED) due to ingestion of 222Rn in milk samples in children and adults has been found 0.60 nSv/y and 0.2 nSv/y respectively, there are excellent correlation between radium concentrations and radon exhalation rate and uranium concentration(R2=1). Thus, the results of this study do not constitute a health hazard to the lives of people because they are within the limits allowed internationally.
Investigating the Level of Radon 222Rn and Radium 226Ra in Soil Samples Taken From Al-Amarah in the South of Iraq
Authors: Atiah Al-zahy Younis M , Mzahiwat Murtadha
Published: April 2021

Radon (222Rn) is created in the soil by radioactive decay of Radium (226Ra) and then emitted from the ground into the atmosphere (exhalation), environmental assessments of radon gas (222Rn) are keys to the assessment of air pollution. The major objective of the current study was to examine the (222Rn) exhalation rates and the (226Ra) concentrations in the soil samples. Thirty soil samples have been collected from ten streets in the region. The (222Rn) exhalation rate and concentrations of (226Ra) in soil samples were calculated using “Can Technique”. The measurements have shown that the surface and mass exhalation rate were varied from 3.9∓0.3 to 18.3∓0.3 μBq.kg−1.s −1, with a mean value of 7.8∓0.3 μBq.kg−1.s−1, and 12.9∓0.5 to 60.7∓1 μBq.m−2.s−1, with a mean value of 25.5∓0.9 μBq.m−2.s−1, respectively. In addition, the results showed that the values for 226Ra concentrations ranged from 1.8∓0.04 to 8.7∓0.1 Bq.kg−1, with a mean value of 3.7∓0.1 Bq.kg−1. Overall, the indications showed that the levels of (226Ra) in soil samples are less than the hazardous levels of human health 370 Bq.kg−1.
A mobile learning application for Malaysian sign language education
Authors: Siong T J , Nasir N R M , Salleh F H M
Published: April 2021

Malaysian Sign language is the primary means of communication among the deaf-mute community in Malaysia for many years since it was first created in 1998 when the Malaysian Federation of Deaf was first established. Although Malaysian Sign Language is widely used among the deaf-mute community, hearing individuals often have little or no exposure to the usage of sign language due to the lack of pervasive environment for the usage of sign language. There is also a lack of effective mobile learning application that encourages and facilitates the learning of sign language. This creates a communication gap among the deaf-mute community and the hearing individuals. The objective of the project is to design a mobile application that can facilitate the learning of sign language and ultimately bridging the gap between deaf-mute communities and hearing individuals. A survey was carried out to elicit the requirements of potential users. The sample population was drawn from Bahasa Isyarat Malaysia (BIMMFD) Facebook group and Universiti Tenaga Nasional (UNITEN) students. The questionnaire consists of multiple-choice questions, open-ended question and dichotomous questions which can be logically divided into demographic questions, questions on the experience of a participant on sign language, preferred learning methods and the preferred features of the application. The findings show that there is a need for an effective and interactive mobile application for learning sign language. Most of the respondents agreed that video tutorials are their preferred learning method as it is more dynamic than learning via images or books. A majority of the respondents also have no experience in using a sign language learning application due to the lack of availability on the market. Moreover, most of the participants also show interest in using a mobile application in learning Malaysian Sign Language. Some respondents also requested the feature of a built-in dictionary. Thus, the findings validate that SLEM has its demand and potential to provide a more accessible and user-friendly means to learn Malaysian Sign Language. The application has the potential to be commercialized to industries and communities such as sign language learning institutions, the public and individuals who are related to deaf or verbally challenged individuals. This paper provides directions and guidance for further development of this educational mobile application.
PARKEY : ticket-less parking system using license plate recognition approach
Authors: Kamaruzaman M A M B , Nasir Naziffa Raha Md
Published: April 2021

As of recent practice, the majority of current parking systems are still implementing the same traditional method of giving entry to parking visitors which is by giving out a physical ticket. This has caused several problems for mall visitors. Therefore, it is planned to propose a system that can eliminate the problems and provide further improvement to the current systems. Our proposed system named PARKEY is a Ticket-less Parking System that has been designed to provide a new method of parking entry and exiting while implementing new features in the parking system. The objective of the project is to provide a working ticket-less entry and exit system by using a virtual ticket with the help of image recognition technology. With the proposed system being developed, it will help to solve problems that are present in the current systems and give an implementation of a parking system that is up to par with the current standard of technology. Before the system was developed, interviews, observation, and requirement reuse were used as methods to elicit requirements that will provide useful insights for the development of the system. Before the system was developed, interviews, observation, and requirement reuse were used as methods to elicit requirements that will provide useful insights for the development of the system. This includes providing questions to users, making observations to current systems deployed, and studying existing systems ranging from older systems to newer, similar systems. Using the stated elicitation techniques, some findings were gathered and are beneficial to the development of the system. The use of observation to current parking systems helps provides data that will be used as a benchmark for the proposed system to identify how quick the proposed system reaction time should be to provide an on-par performance with the current systems. Interviews with several potential users were done to gather information on their experience from the current parking systems and their opinions on what can be improved and expectations of the proposed system. Other than that, studying the currently available systems gives a better understanding of the drawbacks and limitations of the current systems and provides some functionalities from those systems that can be combined and implemented to benefit the proposed system’s improvement during development. The developed proposed system applies a combined usage of a web application, license plate recognition technology, and an e-wallet based payment system to tackle current parking system problems.
Properties of corrugated roofing sheet material from sugarcane bagasse fibers
Authors: Kittisak B , Prayoon S
Published: April 2021

This research was aimed to study the properties of corrugated roofing sheet material from sugarcane bagasse fibers by using 10% adhesive substances comprising Phenol formaldehyde (PF) and polymeric diphenylmethane diisocyanate (PMDI) resins. The corrugated roofing sheet had a density of 500, 700 and 900 kg m−3 and a thickness of 6 mm. Physical, mechanical and thermal properties tests were performed according to industry standards. The results revealed that sheets with high density had low moisture content, low water absorption and low thickness swelling. PMDI resin provided the best adhesive quality. As for the mechanical property investigation, modulus of rupture, modulus of elasticity, the impact strength. Regarding the thermal property investigation, were thermal conductivity and resistance covered. It was also found that the higher density they had, the better mechanical properties they owned. The PMDI-based corrugated roofing sheet with 900 kg m−3 density achieved the best mechanical properties. They can be highly possible to be used as a substitute material for asbestos roofing tiles.
PLS-SEM algorithm for the decision to purchase durian milk with seeds
Authors: Mai D S , Hai P H , Cuong D T , Khoi B H
Published: April 2021

This research’s primary purpose was to research these factors’ influence on buying decision durian milk with seeds. We gathered research data from 300 consumers in Ho Chi Minh City, Vietnam. The research model was proposed from previous researches. Besides, we applied the PLS-SEM Algorithm with SmartPLS software for data analysis. Partial least squares (PLS) path modeling is a variance-based structural equation modeling (SEM) method that is broadly implemented in business and social sciences. It is a new statistical tool for the research method. The research results showed that factors (brand, product availability, product reference group, product quality, and promotion activities) positively affected purchasing decisions.
Precursors and ramifications of creativity on innovation in product design teams - A study on Indian information technology sector
Authors: Pandey S , Ruhela V , Ruhela S
Published: April 2021

Creativity and creative ideas rest at the heart of designing a novel product. Having said that, the understanding of the source and the process of these exquisite ideas that ultimately form the foundation of novel products is not very extensive. This study takes its lead from the design outlook at the organisational level suggested by Dave Ulrich. It goes one-step forward to grasp the mediating role of creativity between dynamics of the team and the competitive advantage it gives the product. Delving deeper, the aim is to understand the creativity in teams that design these novel products in terms of the product itself and the program to market such product. Exploring the influence of creativity on the strategic outcomes associated with innovation, this study empirically tests the impact of group dynamics, both within and outside these groups on the novel product and the program to market them. The study takes into account inputs from 206 employees in information technology sector in India. Maximum likelihood estimation has been used test the model by placing it in a structural equation. Upon analysis, novelty and meaningfulness come out as the dimensions that impact dynamics of teams. The novelty of a new product emerges as the resultant of divergent processes primarily impacted by factors outside of the team such as reward systems and the process of planning. In addition, the meaningfulness that comes with the new product is derived from a convergent process prominently affected by factors within the team - provisions and superordinate identity. Moreover, the newness of the market program is determined by the cohesion in a social setting, formalisation in the process of planning and risk taking likelihood. The study also indicates that the newness of the new product and its meaningfulness has a more profound mediating role in ensuring a competitive edge. Thus, it can be concluded that an organisation gains a significant edge in competition if it manages the dynamics of teams to foster creative novel products and programs to market them.
Advanced MF antennas for underground communications
Authors: Fedosov D V , Kolesnikov A V , Nikolaev A V
Published: April 2021

The paper considers the features of underground radio communication at medium frequency (MF) range. The perspective and most effective antenna solutions at MF range are presented. The characteristics of the antennas are given: the reflection coefficient, the dependence of the input impedance. Antennas are matched with voltage standing wave ratio (VSWR) less than 1.2. Attention is focused on some features of the operation of these antennas. The results of comparative tests of antennas are presented.
Parametric and structural optimization of the modal filter on a double-sided printed circuit board
Authors: Samoylichenko M A , Gazizov T R
Published: April 2021

The effect of reducing the foil thickness and removing of one or two reference conductors in a modal filter on a double-sided printed circuit board is considered. The simulation of the ultra-short pulse propagation in such structures demonstrated that the signal is attenuated by 2 times in relation to half the e.m.f. when the foil thickness is 70 µm and by 3 times when the top left reference conductors is removed.
Quasi-static analysis of susceptibility of the spacecraft power bus bar to the effects of electrostatic discharge
Authors: Drozdova A , Komnatnov M
Published: April 2021

We performed a quasi-static analysis of susceptibility of the spacecraft power bus bar to the effects of electrostatic discharge (ESD). For the analysis, we used a schematic diagram of a power bus bar model with branch conductors. The schematic diagram consists of series-connected transmission lines, which represent the cross-sections of each power bus bar element. An ESD pulse with a current shape of fourth severity level was accepted as an excitation. The work shows the voltage waveforms at the beginning and end of the power bus bar when ESD impacts the branch conductors. We localized the maximum amplitude of the voltage in the bus section under ESD exposure. It revealed that when ESD affects the shielding tape covering the negative branch, there is a maximum attenuation (13.5 times) at the positive branch and a minimum attenuation (1.6 times) at the negative branch.
Intelligent tools for analyzing NON-factors of the project environment
Authors: Bulygina O V , Emelyanov A A , Ivanova O A
Published: April 2021

The implementation of complex innovative projects to create high-tech products is usually associated with a high level of uncertainty, which is due to the lack of “quality” (accurate, complete, reliable, consistent, etc.) data on their internal and external environment. In this regard, special attention must be paid to the stage of project planning, which takes into account the results of identification and analysis of risk situations that may arise during the project implementation. In conditions of information uncertainty, it is advisable to use data mining methods to solve these problems. So, to identify the factors of the internal and external environment, which can negatively affect the project, it is proposed to use a neural fuzzy classifier. The analysis of the identified factors must be carried out taking into account the possibility of the simultaneous occurrence of several risks, i.e. the appearance of a systemic effect, which can be assessed using the Hartley emergence coefficient. In turn, the obtained values of this indicator determine the choice of analysis tools: in the case of a low value, it is proposed to use fuzzy logical inference according to the Mamdani algorithm, otherwise - fuzzy pyramidal networks.
Prototype of EMC Expert system for optimal design of radio-electronic equipment
Authors: Kvasnikov A A , Kuksenko S P , Idrisov F F
Published: April 2021

This paper presents the results of the development of a prototype EMC expert system for optimal design of radio-electronic equipment. The work outlines the general structure of the system and describes the development features of the interference signals database, the analytical report generation module, the ready-made solutions database, the shielding effectiveness module and the degradation trend module.
Multicriteria optimization of a four-layer reflection-symmetric modal filter parameters for ESD protection
Authors: Zhechev Y S , Ivantsov I A , Zabolotsky A M
Published: April 2021

The paper presents the results of a quasi-static analysis of a four-layer reflection-symmetric modal filter (MF) in the time domain. The authors analyzed its effectiveness in protecting electronic equipment against electrostatic discharge (ESD). The work presents the results of a genetic algorithm optimization of the geometric parameters of the structure under study. The results show that the investigated MF with optimal parameters can suppress the ESD peak emission at a shorter length.
Experimental study of a high current electromagnetic interference filter for the spacecraft power bus
Authors: Zhechev Y S , Kosteletskii V P , Zabolotsky A M
Published: April 2021

Secondary power supplies, including on-board electronic equipment, extend the range of operating frequencies in order to increase the efficiency of the converters. This leads to the deterioration of electromagnetic environment. We propose a protective device for the spacecraft power bus based on lumped elements, which is characterized by high reliability, radiation resistance, and low mass-dimensional parameters. This device suppresses common and differential conducted interference in high-current power circuits. The results of the circuit simulation and field experiments in the frequency domain are presented. The obtained results are analysed, and the practical recommendations are given regarding the design of noise-suppressing devices based on elements with lumped parameters.
Ultrashort pulse decomposition in the turn of a meander microstrip line with a passive conductor
Authors: Nosov A V , Surovtsev R S
Published: April 2021

The paper presents the results of evaluating the effect of changing the cross-section parameters of a meander microstrip line (MSL) with a passive conductor on the ultrashort pulse (USP) waveform and amplitude. The study revealed the occurrence of additional pulses in the structure under investigation in addition to cross-talk and main mode pulses. The delays of each pulse were determined and the conditions for USP decomposition in a meander MSL with a passive conductor into a sequence of seven pulses were formulated. By means of heuristic search optimization according to the criteria for fulfilling formulated conditions and the criterion of the minimum amplitude, we obtained the optimal parameters of the line cross-section, at which the USP is decomposed into a sequence of seven pulses with attenuation of 5.38 times relative to half of the electromotive force.
Modular operators and entanglement in supersymmetric quantum mechanics
Authors: Chatterjee Rupak , Yu Ting
Published: April 2021

The modular operator approach of Tomita–Takesaki to von Neumann algebras is elucidated in the algebraic structure of certain supersymmetric (SUSY) quantum mechanical systems. A von Neumann algebra is constructed from the operators of the system. An explicit operator characterizing the dual infinite degeneracy structure of a SUSY two dimensional system is given by the modular conjugation operator. Furthermore, the entanglement of formation for these SUSY systems using concurrence is shown to be related to the expectation value of the modular conjugation operator in an entangled bi-partite supermultiplet state thus providing a direct physical meaning to this anti-unitary, anti-linear operator as a quantitative measure of entanglement. Finally, the theory is applied to the case of two-dimensional Dirac fermions, as is found in graphene, and a SUSY Jaynes Cummings model.
Growth and development of vanda (Vanda sanderiana) explants in vitro on the effect of extracts of organic matter
Authors: Kasutjianingati  , Firgiyanto R , Pratama N P
Published: April 2021

This study aims to determine the appropriate extract of organic matter to be substituted on MS media, to obtain Vanda orchid Vanda sanderiana plantlets ready for acclimatization. The study consisted of 2 experiments, the first experiment, factorial Completely Randomized Design (CRD), the first factor was tomato extract, consisting of 3 levels (tomato extract 50 ml/l; tomato extract 100 ml/l, and tomato extract 150 ml/l) and the second factor consists of 3 levels of bean sprouts extract (100 ml/l bean sprouts extract, 150 ml/l bean sprouts extract, 200 ml/l bean sprouts extract). The second experiment compared the best or most efficient composition of the first experiment with BAP media (3 ppm), using the T-test. In the first experiment the growth variables (plant height and number of leaves) of all treatments were not significantly different, but the highest number of shoots was obtained at 50 ml/l tomato extract and 100 ml/l bean sprouts extract (6 shoots), the other 1-2 shoots. This treatment in the second experiment was proven to show a better plant height, leaf number and number of shoots than plant growth in BAP media (3 ppm).
Efficacy of coffee peel extract as natural antimicrobial in coconut oil soap to against staphylococcus aureus
Authors: Budiati T , Suryaningsih W , Wahyono A , Azizah DN , Firdaus SF , Imawati KK , Primaharani O , Kurniasari JA , Arlita AUF
Published: April 2021

The aim of the study was to evaluate the efficacy of coffee (Coffea canephora) peel extract as natural antimicrobial in coconut oil soap to against Staphylococcus aureus. S aureus, a pathogenic bacteria, was common to be found on human skin. By using Minimum Inhibitory Concentration (MIC) and inhibition zone, the antimicrobial activity of coffee peel extract were 16,7 + 7,22% and 0,38 + 0,21 mm, respectively. Phytochemical compounds of coffee were caffeic acid, cathecin, coumaric acid, gallic acid, hesperetin, kaempferol, hesperidin, luteolin, quercetin. Antimicrobial activity of coffee peel extract showed to be potential as natural antimicrobial in coconut oil soap to inhibit S. aureus.
Scale up and performance test of the rotary vacuum dryer type batch for drying oyster mushrooms
Authors: Djamila S , Iswahyono  , Bahariawan A
Published: April 2021

Rotary Vacuum Dryer Type Batch (RVDTB) is designed to reduce the moisture content of oyster mushrooms from ± 92% to ± 10%, at 60 °C with vacuum pressure 76 cm Hg and 8 hours drying time by capacity of 2 kg/process. Grinded dry oyster mushrooms produce flour used as a raw material due to its flexibility. This is in accordance with the Indonesian National Standard (SNI), therefore, there is a need to increase the dimensions (scale-up) of RVDTB capacity. The study aims to scale up and to test the RVDTB performance by increasing the drying capacity and suction power of the water jet pump. The methodology was used to redesign the RVDTB scale up, manufacture component, assemble, and test performance. The redesigning results shows on 36 cm diamater of cylindrical drying chamber with a length of 50 cm, and 2 HP suction pump power with the flight sets horizontally on 30°. The performance test results before and after the RVDTB scale-up were a) capacity of 2 kg and 3 kg, b) drying rate of 0.227 kg/hour, and 0.250 kg/hour, c) efficiency of 6.74 % and 7.42 %.
Physical characterization of coconut fruit (Cocos nucífera L) in the region of Jember regency
Authors: Nuraisyah A , Nugroho S A , Fatimah T
Published: April 2021

Jember is known as the region that produces the source of coconut in abundant yet it is not utilized optimally in processing. The research was carried out in May to November 2020 at Jember: 1) in the lowland Wuluhan and Puger subdistrict with a height of 10-100 m above sea level; 2) in Medium region in Arjasa and Silo Subdistrict with an altitude of 100-350 m above sea level and 3) High region in Sumberjambe and Panti subdistrict, with an altitude 400 m above sea level. The measurement of the fruit was analyzed by using a ruler and digital weighing, involved 1) the weight of coconut, 2) fiber of the coconut, 3) water, 4) shell, 5) flesh coconut, and 6) Copra. Data of research are by description. Physical characteristics include the weight of the coconut fruit, the weight of coconut water, the weight of coconut flesh, the weight of the coconut shell, the weight of the copra and the thickness of the coconut flesh. The coconut showed optimally physical characteristics in the medium region (100-350 m above sea level).
Vernalization and benzylamino purine treatments on the generative growth of shallots (allium cepa var. ascalonicum l.) bauji variety in the lowlands
Authors: Siswadi E , Kurniasari L , Ramadhani R
Published: April 2021

True shallot seeds (Allium cepa var. ascalonicum L.) or True Shallot Seed (TSS) has begun to be used widely as planting material. However, not all types of shallot plants can flower and produce true seeds perfectly because the majority of shallot plants in Indonesia are grown in the lowlands with temperatures of more than 30°C. Although there are some local varieties, which naturally flower, they have not been tested until producing true seeds. This study aims to determine the effect of vernalization and benzyl amino purine (BAP) on the Bauji variety onion plants’ generative growth. The research was conducted from July to November 2020 in Jember Regency at an altitude of 89 asl. The research design using a factorial randomized block design. The first factor is vernalization, while the second factor is BAP concentration at 50, 100, and 150 ppm. The results showed an interaction between vernalization factors and the use of BAP, and single-use of BAP did not significantly affect the generative growth of Bauji variety shallot. The vernalization treatment separately actually gave an increasing effect on the percentage of flowering plants, the number of umbels per planting, the number of flowers per umbel, the number of capsules per umbel, the number of seeds per umbel, the TSS weight per umbel, and the weight per 100 seeds.
The effect of gamma radiation on the growth of black rice plants generation m1
Authors: Nurhidayah S , Firmansyah E , Rahayu S
Published: April 2021

Black rice is a food that can be consumed as a functional food ingredient. Black rice has not been widely cultivated while the seeds are not commercially available. Besides, black rice also has several weaknesses such as longevity, high plant habitus and low production. This study aims to test black rice accession using gamma ray irradiation in the M1 generation. The research was conducted in January - April 2020 in the experimental rice fields of Cineam District, Tasikmalaya Regency. The materials used are black rice seeds (PH2, PH3, PH5, PH7 and PH8). The treatments tested were 5 black rice accession (PH2M1, PH3M1, PH5M1, PH7M1 and PH8M1) that was irradiated with gamma rays (200 Gray) and 0 Gray as control. The results showed that irradiated and non-irradiated rice growth gave different responses. All black rice accessions after irradiation experienced stem shortening and decreased number of filled grains. Accession PH 7 showed shorter flag leaves, number of productive tillers and fewer total tillers after irradiation. Meanwhile PH8 showed the number of productive tillers and total tillers were more and the panicles were shorter after irradiation.
Evaluation of Kalibomo watershed water quality using the storet method
Authors: Wibowo M J , Winarno W , Hariono B , Wijaya R
Published: April 2021

The Kali Bomo watershed has a length of ± 7,417 km and passes through Rogojampi District, Banyuwangi Regency. Rogojampi sub-district consists of 10 villages, including Aliyan Village, Powder Village, Gitik Village, Gladak Village, Karangbendo Village, Kedaleman Village, Lemahbangdewo Village, and Mangir Village. The area of Rogojampi District is 102.25 km2 with a population of 94,268 people. There are 4 watersheds (DAS) in Rogojampi District, namely Binau, Tambong, Bomo and Lumbun which irrigate 11,819 hectares of rice fields and 1,113 hectares of land for corn cultivation. The main problem in watersheds in general is the occurrence of changes in land use due to development both upstream, middle and downstream as well as the conversion of forests into cultivated agricultural land. This has an impact on reduced water absorption function, increased erosion, sedimentation and river water quality. Based on the above conditions, it is very important to conduct water quality analysis, especially in the Kali Bomo watershed so that its sustainability can be maintained. The results of the water quality analysis using the STORET method show that the water quality of the Kali Bomo watershed in the 2017 period from January to April for class I, II, III and IV quality is poor, bad, moderate and moderate, respectively.