bluuebunny/crossref_metadata_2025_split huggingface dataset:
Influence of GaAs substrate misorientation on gallium and arsenic evaporation rates
Authors: Spirina A A , Shwartz N L 
Published: April 2021

Abstract
The dependence of the Ga and As evaporation rates on GaAs(111)A substrate misorientation was analyzed using Monte Carlo simulation. The gallium and arsenic desorption rates are proportional to the step density of vicinal substrates at congruent (layer-by-layer) evaporation. With incongruent evaporation (gallium droplet formation on the surface), the arsenic desorption rate weakly depends on the substrate misorientation and the gallium desorption rate is independent of it.
Resonant activation of resistive switching in ZrO2(Y) films
Authors: Ryabova M A , Filatov D O , Koriazhkina M N , Antonov D A , Antonov I N , Gorshkov O N , Kharcherva A A , Dubkov A A 
Published: April 2021

Abstract
Local resistive switching (RS) in ZrO2(Y) films on conductive substrates has been studied using Conductive Atomic Force Microscopy (CAFM). Switching was performed by triangle voltage pulses with superimposed a high-frequency (HF) sinusoidal signal applied to the contact of the CAFM probe to the ZrO2(Y) film (together constituting a nanometer-sized virtual memristor). Earlier, the enhancement of the RS performance has been observed when the HF signal was superimposed onto the switching pulses. The effect was attributed to the resonant activation of the migration of oxygen ions via oxygen vacancies by an external alternating electric field. In the present study, this assumption was confirmed by measuring the frequency dependence of the difference between the probe currents in the low-resistance and high-resistance states with a maximum at about 5 kHz. This frequency corresponds to the characteristic one of the jumps of oxygen ions onto adjacent oxygen vacancies in ZrO2(Y) at 300 K. The experimental results were compared with the results of simulation based on the Chua model of an ideal memristor.
A study of the GaN/Si(111) epitaxial structures grown by PA MBE via coalescence overgrowth of GaN nanocolumns
Authors: Shubina K Yu , Mokhov D V , Berezovskaya T N , Nikitina E V , Mizerov A M 
Published: April 2021

Abstract
The GaN/Si(111) epitaxial structures were synthesized by coalescence overgrowth of GaN nanocolumns using the plasma-assisted molecular beam epitaxy (PA-MBE) technique. Such epitaxial structures can be used as a buffer layer for obtaining high quality GaN epilayers. Structural, electrical and chemical properties of these samples were studied. It was demonstrated that KOH etching of the grown GaN/Si(111) samples results in the separation of the GaN epilayer from the substrate.
Analysis of the AlN phase transition on a sapphire surface within a universal 2D lattice gas model in MBE
Authors: Milakhin D S , Malin T V , Mansurov V G , Galitsyn Yu G , Zhuravlev K S 
Published: April 2021

Abstract
The AlN phase transition on the (0001) Al2O3 surface was investigated. It was experimentally estimated that the AlN formation rate as a function of temperature has a different character in two temperature regions. In the region of relatively low temperatures (T < 1210 K), the AlN formation rate is limited by chemical reactions. At higher temperatures (T > 1210 K), the formation of an ordered AlN phase is determined by a continuous two-dimensional phase transition within the filled AlN-lattice-gas cells formed on the sapphire surface. A three-parameter isotherm is proposed to describe the process. The observed phase transition in the AlN lattice gas is a continuous phase transition or a second-order transition.
Selective-area growth and optical properties of GaN nanowires on patterned SiOx/Si substrates
Authors: Gridchin V O , Reznik R R , Kotlyar K P , Dragunova A S , Dvoretckaia L N , Parfeneva A V , Shevchuk D S , Kryzhanovskaya N V , Mukhin I S , Cirlin G E 
Published: April 2021

Abstract
We present the results of selective-area growth of GaN nanowires by molecular beam epitaxy on patterned SiOx/Si substrates without using seed layers. The morphological and optical properties of selectively grown GaN nanowires are compared to the properties of GaN nanowires grown on the amorphous SiOx layer. The experimental results show that the selectivity of GaN nanowires is achieved at a substrate temperature of 825 °C which is the lower limit for the selective-area growth of GaN nanowires on SiOx/Si substrates. The study of the photoluminescence spectra of the grown nanowires, measured at 77 K show an emission line at 3.47 eV, which corresponds to strain-free GaN.
Increase in the radiative decay rate of the indirect exciton due to application of the magnetic field
Authors: Belov P A 
Published: April 2021

Abstract
The indirect excitons in double quantum well structures can appear in the ground state under application of an external electric field along the growth axis. The relatively slow radiative decay rate of the indirect exciton can be enhanced by a magnetic field pointing in the same direction. In this report, we numerically calculate the exciton energy levels in the GaAs-based double quantum well structure as well as optimize parameters of the structure to allow a noticeable increase in the radiative decay rate of the indirect exciton there by application of the magnetic field.
Amplified spontaneous emission in colloidal solutions of two-photon-excited CdSe/CdS nanoplatelets
Authors: Laktaev I D , Saidzhonov B M , Vasiliev R B , Smirnov A M , Butov O V 
Published: April 2021

Abstract
Two-photon processes in CdSe/CdS nanoplatelets were investigated under high intensity excitation by femtosecond laser radiation (1064 nm, 100kHz). The open-aperture z-scan technique and the measurement of photoluminescence spectra were utilized for studying their nonlinear optical properties. As a result, two-photon absorption and amplified spontaneous emission at high intensity were found in these nanoplatelets.
InP nanowires on Si(111) for piezotronic applications
Authors: Vershinin A V , Soshnikov I P , Kotlyar K P , Kudryashov D A , Samsonenko Y B , Lysak V V , Cirlin G E 
Published: April 2021

Abstract
III-V nanowires (NWs) are a promising technology for piezotronic and nanooptoelctronic applications. In this work, we investigate the processes of fabricating a structure with InP NW arrays on a silicon substrate for piezotronic applications. The coating of the NW array with a polymer and the fabrication of a transparent electrical contact to NWs is studied. The piezoelectric effect for the structures with a nonzero piezoelectric modulus d
33 is demonstrated in an oil environment at voltage amplitudes of about 100 mV. The experimental electromechanical coupling is about 0.049, which is close to the theoretical estimate of 0.053.
Effect of additional annealing on the electrophysical properties of large-size CVD-graphene samples
Authors: Tonkov D N , Gasumyants V E 
Published: April 2021

Abstract
This paper is devoted to the comparative study of the resistivity temperature dependences for large-size 1–2 layered graphene samples prepared by the CVD method and subjected to additional annealing in an Ar/H mixture at different temperatures. The influence of the annealing temperature on the temperature dependences of resistivity was qualitatively analyzed for two types of initial samples demonstrating a metallic- or semiconductor-like ρ(T) dependence. This made it possible to elucidate the processes occurring in the samples upon annealing, as well as to assess the degree of their influence on the electrical properties of the annealed samples. This analysis showed that the main processes initiated by annealing are the formation of additional defects and cleaning of the graphene surface. To confirm this conclusion, we performed a numerical analysis of the experimental ρ(T) dependences, based on a model taking into account different scattering mechanisms of charge carriers in graphene samples. This allowed us to determine the concentrations of impurities on the graphene surface and defects in the graphene crystal structure for all investigated samples. The character of the change in these values depending on the annealing temperature for samples with different types of the ρ(T) dependence is discussed.
Passively Q-switched fiber laser with various phases of Ni-S as a saturable absorber
Authors: Kuznetsov P I , Savelyev E A , Sudas D P , Yakushcheva G G 
Published: April 2021

Abstract
Nanoparticles of NiS (amorphous α and crystalline β phases), Ni3S2 and Ni were obtained by passing H2S through a solution of NiSO4•7H2O followed by drying or annealing of washed precipitate in hydrogen or nitrogen atmospheres. The synthesized materials were mixed with a polymer (polydimethylsiloxane elastomer) and applied to the surface of chemically prepared conical constrictions on SMF-28 fiber. Passive Q-switches were integrated into a specially designed erbium ring fiber laser and tested. For the first time, the generation of µs pulses was realized using these compositions of the binary system Ni-S. The best parameters of a pulsed laser obtained using β-NiS nanoparticles as a saturable absorber were a repetition rate of 21.7 kHz, an average output power of 26.72 mW, and a pulse energy of 1230 nJ.
Characteristics of double-cascade photodiodes based on p-i-n AlGaAs/GaAs diodes connected by n++-GaAs/i-GaAs/i-AlGaAs/p++-AlGaAs tunnel diodes
Authors: Kontrosh E V , Kalinovskii V S , Klimko G V , Vaulin N V , Ya Ber B 
Published: April 2021

Abstract
Characteristics of double-cascade nonmonolithic p-i-n AlGaAs/GaAs photovoltaic converters of high-power laser radiation, electrically combined with n++-GaAs/i-GaAs/i-AlGaAs/p++-AlGaAs tunnel diodes, have been studied. The AlGaAs/GaAs p-i-n structures of the photovoltaic converters and n++-GaAs/i-GaAs/i-AlGaAs/p++-AlGaAs tunnel diodes were grown by molecular-beam epitaxy. The photoelectric characteristics of the double-cascade AlGaAs/GaAs photovoltaic converters were examined in the temperature range from 103 to 298 K under excitation with a laser light wavelength of 809 nm and a power density ⩽92 W/cm2. The double-cascade p-i-n AlGaAs/GaAs nonmonolithic photovoltaic converters of planar design had a fill factor of 0.88 and efficiency of 58.2% at a temperature of 103 K. It was shown experimentally that the current-voltage characteristics of the connecting n++-GaAs/i-GaAs/i-AlGaAs/p++-AlGaAs tunnel diodes affect the photoelectric parameters of the double-cascade photovoltaic converters of high-power laser light.
Centers of cold electron emission from molybdenum thin films
Authors: Bizyaev I S , Osipov V S , Babyuk V Ye , Struchkov A I , Gnuchev N M 
Published: April 2021

Abstract
Thin-film semiconductor devices and functional metal-oxide-semiconductor structures have drawn attention as being applicable for on-chip electronics. Similar structures, however, were also reported to be promising as efficient sources of electrons. This paper presents the results of scanning electron microscopy analysis of molybdenum thin films capable of low-macroscopic-field electron emission. Supposedly, the images show the centres of cold-field emission at different stages of their life cycles from activation to destruction. It is assumed that initially continuous Mo films experience dewetting under heating and ion bombardment, which are caused by the emission current flow. The results contribute to understanding the mechanism of low-field emission from thin metal films, which seems to be different from those previously proposed for thin carbon coatings.
Utilization of chitosan clam bloodshells as a coagulant for processing electroplatting waste
Authors: Wulandari C D , Setyobudiarso H , Koteldae M 
Published: April 2021

AbstractUtilization of coagulants with natural ingredients has been widely developed, the advantage of using biocoagulant is the availability of abundant material, easy to obtain it, from renewable materials, and low toxicity. This research compare chitosan clam bloodshells (Anadara granosa) coagulan and alum coagulan, to reduce concentration total chrome, nickel and turbidity in electroplating waste. The variations of coagulan, 300 mg/l and 600 mg/l, variation of the speed used is 150 rpm and 300 rpm. Results of the research, Alum and Chitosan can reduce the concentration of TSS, Nickel and Total Chrome. Alum can removel TSS by 93.75% at dose 300 mg/l, stirring speed of 150 rpm, Nickel by 32.49% at dose of 600 mg/l, stirring speed of 300 rpm, total Chrome removal of 64.09% at dose of 600 mg/l, stirring speed of 300 rpm. Coagulant chitosan TSS by 97.79% at dose 300 mg/l and 600 mg/l, stirring speed of 150 rpm, Nickel by 50,73% at dose of 600 mg/l, stirring speed of 150 rpm, the total chromium by 72.88% at dose of 600 mg/l, stirring speed of 150 rpm. Alum and chitosan coagulant the ability to neutralize the pH in accordance with the standard quality standard of electroplating waste, from 6.2 to 7.6.
Comparison of phenolic, flavonoid, and tannin contents from ethanol extract of Kratom stem (Mitragyna speciosa Korth.) and senggani flower (Melastoma malabathrium L.)
Authors: Hanifah H N , Hadisoebroto G , Dewi L 
Published: April 2021

Abstract
Indonesia is a country known for its useful natural resources, especially for a health maintenance and treatment of diseases. Some of the plants that can be used as traditional medicine are kratom (Mitragyna speciosa Korth) and Senggani (Melastoma malabathrium L.). The purpose of this research was to determine the total phenolic content, total flavonoids content, and total tannins content in the ethanol extract of kratom stems and flowers using the UV-Vis spectrophotometric method. The comparator used in determining the phenolic content was gallic acid, for the flavonoid content was quercetin, and for the tannin content was tannic acid. The results of this study showed that the total phenolic content in the kratom stem extract was 23.59 mg/gram of extract, while in the senggani flower was 43.97 mg/gram of extract. The total flavonoid content in the kratom stem extract was 10.65 mg/gram of extract, while the senggani flower was 11.26 mg/gram of extract. Lastly, the total tannin content in the kratom stem extract was 17.99 mg/gram of extract, while in the senggani flower it was 13.74 mg/g extract.
The effect of different storage times at 5°C on the quality of yogurt with the addition of local taro starch (Colocasiaesculenta) as stabilizer
Authors: Krisnaningsih A T N , Rosyidi D , Radiati L E , Purwadi P , Hadiani D P P , Wae R L 
Published: April 2021

Abstract
The purpose of this research was to determine the effect of storage time at 5°C on the quality of yogurt with the addition of local Taro Starch as Stabilizer. The materials were used: fresh cow’s milk, skim milk, starter and taro starch. The research method used was a laboratory experiment using a Completely Randomized Design (CRD) with different storage times at 5°C, namely: 5 treatments including: P1: 1 day, P2: 7 days, P3: 14 days, P4: 21 days, P5: 28 days. Each treatment was repeated 4 times so that 20 research units were obtained. The variables observed were the syneresis, WHC, pH, and total acid of the yogurt. Data were analyzed by one way Anova and followed by Duncan’s multiple range test (DMRT). The results showed storage time at a refrigerator temperature of 5°C gave a very significant difference (P≤0.01) to the syneresis, WHC, pH, and total acid of the yogurt. Based on the research results, it can be concluded that the storage time of yogurt can last up to 21 days.
Chemical analysis and organoleptic properties of banana blossoms (Musa paradisiaca) as filler for catfish (Clarias sp.) fish floss
Authors: Perdana W W , Widowaty W , Sofia D R , Setiawan Y , Hadayanti D , Zakaria A 
Published: April 2021

Abstract
Meat floss or known as Abon (Indonesian) made from dried meat and has a fluffy texture similar to cotton coarse. The crude protein content of meat floss was less than 15%. Catfish (Clarias sp.) has rough fiber and does not contain many bones that are ideal for the main ingredients for meat floss. Catfish (Clarias sp.) cultivated from freshwater can be used as main ingredients for meat floss. To raise the economic value of meat floss, some use banana blossoms (Musa paradisiaca) as a filler. This study aims to determine the effect of banana blossoms as a filler and frying temperature on the chemical quality and organoleptic properties of catfish meat floss. The Method of this research is to make catfish meat floss with various banana blossoms and various frying temperatures. The method used is the analysis of variance or the factorial pattern of analysis of variance (ANOVA). The result showed the most preferred sample was the treatment sample with 60% banana blossoms filling and a frying temperature of 170 °C. The samples have the moisture content of 6,8%, the protein content of 14,91%, and fat content of 9,73%, as well as the preferred parameters of color, fragrant, flavor, and texture. The results showed that the use of banana blossoms as a filler in catfish floss improved the quality of shredded and has the potential to be used as a form of food product diversification.
Quality evaluation for chili hybrid variety candidate cultivated on highland
Authors: Rahayu S T , Kirana R , Levianny P S 
Published: April 2021

Abstract
Chili is one of potential vegetable due to its high demand and as an important source of nutrition. Hybrid chili has several advantages so it is beneficial to be cultivated. The purpose of this study is to examine the quality of several prospective varieties of large chili hybrids which will be released as new varieties. This research was conducted in Indonesian Vegetable Research Institute in 2019 at the Post Harvest Physiology Laboratory, West Bandung Regency, West Java. The materials used in the study were 3 chili variety candidates and 2 existing varieties that harvested in Lembang during rainy season. The study used randomized block design with 5 treatments and 5 replications. Physical parameters observed were weight, diameter, length, and texture. Chemical parameters include water content (gravimetric method), Total Soluble Solid (TSS), vitamin C (titration method), and ash content. Organoleptic test was carried out by 15 untrained panelists using scale from 1 (like extremely) to 5 (dislike extremely) in order to determine consumer acceptance of the freshness of chillies. The organoleptic tests were conducted on days 0, 4, and 7. The results showed Genotype number. 4 had weight, diameter and vitamin C close to the comparative varieties. Genotypes number 2 and 3 have quality parameters (color, shape, size, appearance, and freshness) preferred by consumers during storage until the 7th day at room temperature in Lembang area of West Java.
Biodiversity of prokaryotic microorganisms in whey tofu from Lembang, Sumedang and Garut West Java
Authors: Junitasari A , Warganegara F M , Widhiastuty M P 
Published: April 2021

Abstract
Tofu is one of the products processed from soybeans that contain nutrients for the body. Tofu from Lembang, Tofu from Sumedang and Tofu from Garut are three types tofu that are produced in different places. Types of microorganisms found in whey can influence the flavor of tofu. This research was conducted to find out the type of microorganisms contained in whey Tofu from Lembang, Sumedang and Garut through metagenom approach. Through this approach, the microbial species in an environment can be known, even without the need to cultivate the microorganism. Whey samples filtered by cellulose acetate membrane of 0.2 µm. Total DNA was isolated by the Klijn method, and used as a template to obtain a fragment of 16S rRNA with ± 400 bp long using touchdown PCR. Amplicons obtained then separated again by DGGE analysis. Optimization of DGGE was made with 8% gel and a denaturant range of 30%-80%. The microorganisms contained in whey Tofu from Lembang have closer homology to the Bacterium EM, microorganisms contained in Tofu from Sumedang were closer with Acinobacter sp. and Uncultured Bacterium, while microorganisms contained in Tofu from Garut were closer to Uncultured bacterium.
The effect of concentration and temperature on the activities of kenikir (cosmos caudatus) leaf extract as iron corrosion inhibitor in electrolyte solution of NaCl
Authors: Sudiarti T , Yulianti Y , Supriadin A 
Published: April 2021

Abstract
Ethyl acetate extracts from kenikir leaves contain flavanoid, alkaloids and tannins compounds. This compound can be used as a corrosion inhibitor because it contains nitrogen and oxygen atoms with a pair of free electrons so that it allows adsorbed strongly on the surface of the iron and increases the activity of corrosion inhibition. The inhibitory activity was analyzed by wheel test method or measurement of weight loss in NaCl 1 % medium with variations in concentration, temperature and electron microscopy (SEM) analysis. The inhibitory activity of kenikir leaf extract increases with increasing concentration of inhibitor. The optimum inhibition efficiency of was obtained at a concentration of 32 ppm with an inhibition efficiency of 86.84%. An increase in temperature from 25-55 ° C causes decreased inhibitory activity and achieves optimum inhibition efficiency at 25°C. Kenikir leaf extract has adsorption properties that correspond to the Langmuir adsorption isotherm with free energy of ΔGads of -14.98 KJ/mol. The results of the surface analysis by Scanning Electron Microscopy (SEM) showed that the kenikir leaf extract could inhibit corrosion rates with iron surfaces that had fewer pores than without inhibitors.
Aplication of nanogold and nanosilver to reduce rheumatic arthritis: Case study at leprosy patients
Authors: Taufikurohmah T , Rusmini R , Soepardjo D 
Published: April 2021

Abstract
This study aims to ensure the treatment of rheumatoid arthritis cases suffered by leprosy patients. Special inspection is carried out every 2 weeks during the treatment. Treatment by giving nanogold and nanosilver volunteers every morning and night as much as 20 ml 20 ppm in drinking water. The number of volunteers 24 people with an age range of 40-70 years. The sex of male volunteers is 12 people and women are 12 people. The condition is divided into 4 categories; weight, moderate, mild and cured. In the beginning, volunteers were chosen in the weight and moderate categories. Research data were medical records and interviews. The results show a gradual recovery process towards recovery. One person with an initial condition in the weight category had not recovered for 3 months of treatment. Overall there was an improvement in conditions from weight to moderate, mild and recovered. Gender has no effect on the recovery process. The conclusions of the nanogold and nanosilver case studies succeeded in alleviating to cure rheumatoid arthritis volunteers for leprosy patients. This case study has the impact give new hopes for leprosy patients to keep their spirits alive. This is very important for the future of leprosy patients free from rheumatoid arthritis.
Investigating the potency of bioactive compounds from ficus religiosa as anti-inflammatory agent
Authors: Utami W , Aziz H A , Nasrudin D , Kusmawan A , Anwar Z , Maulana M , Daryanto M 
Published: April 2021

Abstract
The previous studies explain that bioactive compounds from Ficus religiosa are known as an anti-inflammatory agent. In this research, we investigated the potency of bioactive compounds from Ficus religiosa by using molecular docking between eight bioactive compounds and the COX-2 receptor. The eight ligands were collected from www.pubchem.ncbi.nlm.nih.gov., while the receptor was taken from www.rcsb.org. The result of this study could be a reference for the research in the synthesis of the bioactive compound to minimize failure. The collected data was calculated through Autodock Vina embedded in MGL Tools 1.5.6, and these processes were performed using 100 runs of the Lamarckian Genetic Algorithm (LGA). The lowest energy of complexes was visualized by using Biovia Discovery Studio Visualizer. This result proved that 28-Isofucosterol-COX-2 had smaller binding energy compared to the reference ligand.