bluuebunny/crossref_metadata_2025_split huggingface dataset:
Identification and thermal stability of point defects in neutron-irradiated hexagonal boron nitride (h-BN)
Authors: Toledo J R , Krambrock K 
Published: October 2020

Abstract
Point defects in wide-bandgap semiconductors, such as hexagonal boron nitride (h-BN), have driven enormous amounts of research due to their interesting optical properties such as quantum emission at room temperature. Defect engineering by particle irradiation is a very interesting strategy for producing quantum emitters in a controlled way. The identification of most point defects is done by electron paramagnetic resonance and related advanced techniques. Following our recent works, we present new data about point defects produced by neutron irradiation at room temperature and investigate their thermal stability in crystalline, flake and ultrafine h-BN powder. Our experimental data indicate the formation of the nitrogen antisite defect next to a nitrogen vacancy in its neutral charge state, (NBVN)0, with spin S= 1/2 in all types of h-BN showing strong axial hyperfine interaction (A
|| ≈ 95 MHz and A
⊥ ≈ 5 MHz). It is thermally stable up to ~600 ºC, which is similar to the disappearance of the negative charged boron vacancy,

V

B

−

. In addition, after neutron irradiation of h-BN powder samples, a spin S= 1/2 point defect is observed presenting an axial superhyperfine interaction with two equivalent nitrogen nuclei (14N, I = 1, 99.68%), which we tentatively assign to the CNVB defect. It is thermally stable up to ~850 ºC. Another, yet-unidentified S = 1/2 center acts as a charge compensating defect at specific annealing temperatures. Our experimental results are compared and discussed with theoretical models available in the literature.
Assisted laser impedance spectroscopy to probe breast cancer cells
Authors: Mesa F , Paez-Sierra B A , Romero A , Botero P , Ramírez-Clavijo S 
Published: October 2020

Abstract
Confidence and integrity are critical in the physical and chemical analyses of tissues and living cells. However, many of the probes targeting biological markers for confocal spectroscopy affect cells’ molecular identity. Hence, we combined photonics with electrical analysis in an assisted laser impedance spectroscopy facility and applied it to characterize two breast cancer cell lines (BT-474 and MCF-7) and lymphocytes (as a normal control). The setup comprised a sample holder with a ∼15 000 cell capacity fitted with two isolated conducting electrodes arranged concentrically and connected to an impedance analyser with a 20 Hz–1 MHz sweeping frequency. Capacitive transconductance measurements showed bands at 3491, 3494 and 3470 Hz corresponding to the BT-474, MCF-7, and lymphocytes, respectively. Under photonic stimulation by a 532 nm laser, these dark reference bands shifted to 3518, 3566 and 3674 Hz, respectively, reflecting optical transitions favouring ionic transport in the cells. Based on the experimental Nyquist diagrams and taking into account the roughness nature of the cell membrane, a constant phase element (CPE) was introduced in the circuit. The CPE was explained through a fractional parameter, α, based on fractional calculus. Results showed that, under photonic stimulation, α is less than ½, and the minimum change of series and membrane resistances are about 28.95% and 58.88%, respectively.
Partitioning interatomic force constants for first-principles phonon calculations: applications to NaCl, PbTiO3, monolayer CrI3, and twisted bilayer graphene
Authors: Lee Chi-Cheng , Hsu Chin-En , Hsueh Hung-Chung 
Published: October 2020

Abstract
First-principles phonon calculations have been widely performed for studying vibrational properties of condensed matter, where the dynamical matrix is commonly constructed via supercell force-constant calculations or the linear response approach. With different manners, a supercell can be introduced in both methods. Unless the supercell is large enough, the interpolated phonon property highly depends on the shape and size of the supercell and the imposed periodicity could give unphysical results that can be easily overlooked. Along this line, we discuss how a traditional method can be used to partition the force constants at the supercell boundary and then propose a more flexible method based on the translational symmetry and interatomic distances. The partition method is also compatible with the mixed-space approach for describing LO–TO splitting. We have applied the proposed partition method to NaCl, PbTiO3, monolayer CrI3, and twisted bilayer graphene, where we show how the method can deliver reasonable results. The proper partition is especially important for studying moderate-size systems with low symmetry, such as two-dimensional materials on substrates, and useful for the implementation of phonon calculations in first-principles packages using atomic basis functions, where symmetry operations are usually not applied owing to the suitability for large-scale calculations.
The effects of sub-bandgap transitions and the defect density of states on the photocurrent response of a single ZnO-coated silica nanospring
Authors: Wojcik Peter M , Bastatas Lyndon D , Rajabi Negar , Bakharev Pavel V , McIlroy David N 
Published: October 2020

Abstract
The electrical and optoelectronic properties of nanometer-sized ZnO structures are highly influenced by its native point defects. Understanding and controlling these defects are essential for the development of high-performance ZnO-based devices. Here, an electrical device consisting of a polycrystalline ZnO-coated silica nanospring was fabricated and used to characterize the electrical and photoconductive properties of the ZnO layer using near-UV (405 nm) and sub-bandgap (532 and 633 nm) excitation sources. We observe a photocurrent response with all three wavelengths and notably with 532 nm green illumination, which is the energy associated with deep oxygen vacancies. The polycrystalline ZnO-coated silica nanospring exhibits a high responsivity of 1740 A W−1 with the 405 nm excitation source. Physical models are presented to describe the photocurrent rise and decay behavior of each excitation source where we suggest that the rise and decay characteristics are highly dependent on the energy of the excitation source and the trapping of electrons and holes in intermediate defect levels in the bandgap. The energy levels of the trap depths were determined from the photoconductive decay data and are matched to the reported energy levels of singly and doubly ionized oxygen vacancies. A phenomenological model to describe the dependence of the saturation photocurrent on excitation intensity is presented in order to understand the characteristics of the observed breaks in the slopes of the saturation photocurrent versus excitation intensity profile.
Graphene-facilitated synthesized vertically aligned hexagonal boron nitride nanowalls and their gas adsorption properties
Authors: Sun Xiaoyan , Li Dongdong , Gao Wei , Yin Hong 
Published: October 2020

Abstract
The capability of hexagonal boron nitride (h-BN) to adsorb gas atoms may stimulate various promising applications in environment remediation and energy storage, while the interactivity with gas molecules yet remains challenging due to its inherent chemical inertness. In this article, we report a feasible and effective route for the scalable synthesis of vertically aligned h-BN nanowalls assisted by reduced graphene oxide (rGO) without metallic catalysts. The average thickness of the fine h-BN nanowalls is few-atomic layers about 3.7 nm, that grow on the large substrate-like flakes transformed from the pristine rGO. The hierarchical h-BN nanowalls exhibit an enhanced gas adsorption performance, not only through physisorption owing to the synergistic combination of different porous geometries, but also through chemisorption via the open edge groups. Moreover, it demonstrates a significantly enhanced adsorption of CO2 over CH4 as compared to the h-BN nanosheets with similar sizes. Density functional theory calculations reveal that the –OH edge groups can effectively increase the adsorption capability towards CO2, accompanied by a shortened adsorption distance when the gas molecule is energetically stabilized. The wetting characteristics of h-BN nanowalls was further examined by contact angle goniometry.
Microdosimetry of a therapeutic proton beam with a mini-TEPC and a MicroPlus-Bridge detector for RBE assessment
Authors: Conte V , Agosteo S , Bianchi A , Bolst D , Bortot D , Catalano R , Cirrone G A P , Colautti P , Cuttone G , Guatelli S , James B , Mazzucconi D , Rosenfeld A B , Selva A , Tran L , Petringa G 
Published: October 2020

Abstract
Proton beams are widely used worldwide to treat localized tumours, the lower entrance dose and no exit dose, thus sparing surrounding normal tissues, being the main advantage of this treatment modality compared to conventional photon techniques. Clinical proton beam therapy treatment planning is based on the use of a general relative biological effectiveness (RBE) of 1.1 along the whole beam penetration depth, without taking into account the documented increase in RBE at the end of the depth dose profile, in the Bragg peak and beyond. However, an inaccurate estimation of the RBE can cause both underdose or overdose, in particular it can cause the unfavourable situation of underdosing the tumour and overdosing the normal tissue just beyond the tumour, which limits the treatment success and increases the risk of complications. In view of a more precise dose delivery that takes into account the variation of RBE, experimental microdosimetry offers valuable tools for the quality assurance of LET or RBE-based treatment planning systems. The purpose of this work is to compare the response of two different microdosimetry systems: the mini-TEPC and the MicroPlus-Bridge detector. Microdosimetric spectra were measured across the 62 MeV spread out Bragg peak of CATANA with the mini-TEPC and with the Bridge microdosimeter. The frequency and dose distributions of lineal energy were compared and the different contributions to the spectra were analysed, discussing the effects of different site sizes and chord length distributions. The shape of the lineal energy distributions measured with the two detectors are markedly different, due to the different water-equivalent sizes of the sensitive volumes: 0.85 μm for the TEPC and 17.3 μm for the silicon detector. When the Loncol’s biological weighting function is applied to calculate the microdosimetric assessment of the RBE, both detectors lead to results that are consistent with biological survival data for glioma U87 cells. Both the mini-TEPC and the MicroPlus-Bridge detector can be used to assess the RBE variation of a 62 MeV modulated proton beam along its penetration depth. The microdosimetric assessment of the RBE based on the Loncol’s weighting function is in good agreement with radiobiological results when the 10% biological uncertainty is taken into account.
Contact resistance assessment and high-frequency performance projection of black phosphorus field-effect transistor technologies
Authors: Valdez-Sandoval Leslie , Ramirez-Garcia Eloy , Jiménez David , Pacheco-Sanchez Anibal 
Published: October 2020

Abstract
In this work, an evaluation of the contact quality of black phosphorus field-effect transistors from different technologies previously reported is performed by means of an efficient and reliable contact resistance extraction methodology based on individual device practical characteristics. A good agreement is achieved between the extracted values with the Y-function method used here and reference values obtained with other methods considering internal values as well as with more expensive methods involving fabricated test structures. The method enables a direct evaluation of different steps in the same technology and it embraces the temperature dependence of the contact characteristics. Channel phenomena have no impact on the extracted contact resistance values. High-frequency performance projections are obtained for fabricated devices based on the extracted contact resistance.
Rapid threshold switching dynamics of co-sputtered chalcogenide Ge15Te85 device for selector application
Authors: Sengottaiyan Rathinavelu , Saxena Nishant , Shukla Krishna Dayal , Manivannan Anbarasu 
Published: October 2020

Abstract
Threshold switching is a unique characteristic feature in amorphous chalcogenide materials that establishes stable and fast switching between a high resistance OFF state and a conductive ON state in the amorphous phase, envisaging the electronic nature of two-terminal ovonic threshold switch (OTS) selectors in vertically stackable cross-point memory arrays. In this paper, we demonstrate voltage-dependent nanosecond threshold switching dynamics and stable OFF–ON transitions of co-sputtered thin Ge15Te85 film devices using ultrafast time-resolved current–voltage measurements. The time-resolved measurement of device current upon the application of voltage pulse reveals a stable threshold switching and OFF–ON transient characteristics of OTS devices and the measured delay time is found to decrease to few nanoseconds upon increasing the amplitude of the applied voltage pulse and such OTS characteristics are found to be stable even above 60% of the high value of threshold voltage. These experimental results found to be consistent with analytical solutions and also demonstrate a systematic trend in the voltage dependent switching properties enabling ultrafast threshold switching characteristics suitable towards designing reliable and stable OTS selector devices.
A model for photothermal conversion of graphene-filled nanocomposites under NIR irradiation
Authors: Li Fang , Wang Lanlan , Tian Hongyan , Zhang Haiyu , Lin Yongshui 
Published: October 2020

Abstract
Graphene, acted as an excellent photothermal inorganic filler in photothermal smart composites, has triggered the fast increasing research upsurge in biomedical imaging, photothermal therapy, photothermal driving and so on recently. Many studies have shown that a low mass loading graphene nanosheets (GNSs) in a matrix can provide the nanocomposite with high photothermal conversion efficiency in the near-infrared (NIR) region due to its strong NIR adsorption and high thermal conductivity. Aiming to indicate the photothermal conversion mechanism, we present an analytical approach based on the Maxwell electromagnetic wave theory, thermodynamics method and effective medium approximation. The influence mechanism of graphene concentration and size, light intensity of NIR irradiation, interfacial thermal resistance between graphene and matrix on the photothermal conversion are all explained in this paper.
Elinvar effect in β-Ti simulated by on-the-fly trained moment tensor potential
Authors: Shapeev Alexander V , Podryabinkin Evgeny V , Gubaev Konstantin , Tasnádi Ferenc , Abrikosov Igor A 
Published: October 2020

Abstract
A combination of quantum mechanics calculations with machine learning techniques can lead to a paradigm shift in our ability to predict materials properties from first principles. Here we show that on-the-fly training of an interatomic potential described through moment tensors provides the same accuracy as state-of-the-art ab initio molecular dynamics in predicting high-temperature elastic properties of materials with two orders of magnitude less computational effort. Using the technique, we investigate high-temperature bcc phase of titanium and predict very weak, Elinvar, temperature dependence of its elastic moduli, similar to the behavior of the so-called GUM Ti-based alloys (Sato et al 2003 Science
300 464). Given the fact that GUM alloys have complex chemical compositions and operate at room temperature, Elinvar properties of elemental bcc-Ti observed in the wide temperature interval 1100–1700 K is unique.
Genetic differences and population structure of spotted barb (cyprinidae) collected from three rivers in Java Island
Authors: Astuti S S , Hariati A M , Kusuma W E , Wiadnya D G R 
Published: October 2020

Abstract

Barbodes binotatus is an endemic species and most dominant freshwater fish in Indonesia. This prelilinary study aimed to calculate genetic differences of the species from three different rivers in Java island. A total of 90 specimens were collected from each river and a total of 26 sequences were analyzed using mitochondrial DNA (mtDNA) region Cytochrome Oxidase Subunit I (COI). BLAST analysis showed > 97 % similarity of B. binotatus with another research. The result of sequence analysis showed that B. binotatus from Central Java were not significantly different from B. binotatus from East Java, and B. binotatus from West Java were significantly different from two others. The genetic differences of B. binotatus from three locations were observed in five basepair (335 bp, 399 bp,449 bp, 497 bp, and 545 bp). The result of population structure analysis showed an FST value of 1.00. It suggested that there was genetic differentiation between populations of Pasuruan, Yogyakarta and Cirebon. Inter-location analysis requires to be done to confirm the genetic differences from another regions.
Factor Analysis of Lipid Profile in Early Adulthood with Inappropriate Food Consumption Habit: Screening Approach Dyslipidemia Induce Atherogenesis Acceleration
Authors: Kumboyono K , Cesa F Y , Wihastuti T A , Nurwidyaningtyas W 
Published: October 2020

Abstract
Dyslipidemia is a risk factor for cardiovascular disease through atherogenesis induction. The productive age of early adulthood today has different eating habits in relation to increasing culinary lifestyles and food hunter habits. In general, dyslipidemia rarely causes early phase symptoms. We suspect that there is an increase in the group with impaired lipid profiles related to dietary habits that do not pay attention to the essential needs of eating. The collected serum was carried out using a venous puncture procedure on 45 early adult subjects (men n = 9; women n = 36) aged 19-27 years in Malang City. The lipids were analysed for lipid profiles including TC, TG, HDL-c, and LDL-c. The results of men respondents showed higher differences in the lipid profiles of TC (p = 0.000), TG (p = 0.001), and LDL (p = 0.000) than women while HDL-c levels (p = 0.010) in women had higher differences than men. Dumpling (contains noodles and beef) has positive correlation with TG, TC, and LDL. At least in this study, we found that men in early adult had a higher lipid profile compared to women. This is of course related to diet have an impact on increasing lipid levels. For this reason, it is advisable to maintain a more productive eating habits to reduce the risk of dyslipidemia.
A Comparative Study on Nutritional Value of Purple Sweet Potatoes from West Java and Central Java, Indonesia
Authors: Kurnianingsih Nia , Ratnawati Retty , Nazwar Tommy Alfandy , Ali Mulyohadi , Fatchiyah Fatchiyah 
Published: October 2020

Abstract
This study aimed to compare the nutritional value of two local cultivars of purple sweet potatoes from West Java and Central Java Indonesia. The proximate analysis was conducted to investigating the percentage of protein, carbohydrate, ash, water, total fat, total energy and energy from fat. Amino acid analysis was conducted using Ultra Performance Liquid Chromatography except the tryptophan by High Performance Liquid Chromatography. West Java cultivar were relatively higher content of carbohydrate, ash, total fat and total energy than Central Java cultivar. Central Java cultivar relatively higher protein and amino acid content. The three highest amino acids in Central Java cultivar were aspartate 2550.2 mg/kg, glutamic acid 1711.9 mg/kg and leucine 1127.8 mg/kg. Meanwhile, the three highest from West Java cultivar were aspartate 1214.8 mg/kg, glutamic acid 1177.8 mg/kg, and phenylalanine 667.9 mg/kg. Methionine was detected as the lowest amino acid in Central Java cultivar and were not detected in West Java cultivar. We assumed that Central Java cultivar have better protein and amino acid content than West Java cultivar. Further study is required to explore the nutrition benefit of both cultivars.
Effect of temperature and pH combination on vegetative cell growth of Bacillus megaterium
Authors: Mahariawan I M D , Kusuma W E , Yuniarti A , Hariati A M 
Published: October 2020

Abstract

B. megaterium is a potential bacterial species to be recommended as a probiotic which has been tested to have beneficial effects for fish. Vegetative cells availability is not only influenced by culture media composition but is also affected by environmental conditions such as temperature and pH. The purpose of this study was to determine the effect of temperature and pH combination on vegetative cell production and growth rate of B. megaterium. This study used a combination of temperature treatment (37, 44 and 51 °C) and pH (4, 7 and 10) to produce B. megaterium planted in wheat flour (Triticum aestivum) media. Results showed that the highest vegetative density was found at 37 °C and pH of 10 as much as 11 x 108 cells. mL−1 with a growth rate of 0.65 hour−1. In addition, the morphology of bacteria from this study presented the length and width of B. megaterium at 2.44 – 3.82 µm and 1.11 – 1.31 µm, respectively.
The Two Peptides Fragments of Goat Milk CSN1S2 Protein Blocked Insulin Receptor to Interact Ligand: In Silico Study
Authors: Pertiwi Kadita Octavia , Fatchiyah Fatchiyah 
Published: October 2020

Abstract
Insulin is a hormone that plays important role for tissue development and glucose homeostasis, it has significant implications for many chronic diseases, especially diabetes mellitus (DM). Alpha casein S2 (CSN1S2) isolated from Ethawah goat’s milk has eight peptides residue contain seven to twelve amino acid residues and has multiple functions, such as antimicrobial, immunomodulatory, and anti-oxidant. The purpose of this study is to observe the interaction between CSN1S2 protein peptides and Insulin Receptor. 3-D structure of Insulin Receptor is done by accessing RCSB PDB (ID: 4ZXB), protein was prepared using Discovery Studio BIOVIA 2019 and ligands were prepared using PyRx. Insulin receptor was docked to CSN1S2 protein peptides using HEX 8.0 software and visualized using Discovery Studio BIOVIA 2019. The results of this study showed different binding patterns, most of the chemistry bond were resulted between protein and ligands interaction are hydrogen bonds and electrostatic, the binding energy of CSN1S2 fragment 41-47 and fragment 214-221 to insulin receptor are -186.9 kJ/mol and -172.7 kJ/mol respectively. The caprine CSN1S2 protein peptides have ability to be used as therapeutic agents, such as DM because they can bind to specific sites of the insulin receptor and may reduce the insulin resistance mechanism.
Nutrient content and endemic red fruit oil (Pandanus austrosinensis) fatty acid profile in Papua Indonesia
Authors: Renyaan A. W. A. , Suprayitno E , Aulani’am  , Hariati A M 
Published: October 2020

Abstract

Pandanaceae clan red fruit of the in Papua and West Papua provinces, there are as many as 600 to 700 species. The research location was in the village of Bowi Subur (Settlement Unit VI/SP VI) Masni District Manokwari Regency. This study aims to determine the nutritional content and fatty acid profile found in the Menja cultivar red fruit oil (Pandanus austrosinensis), Edewewits and Mengkin. The nutritional levels of Pandanus austrosinensis, Edewewits, and Mengkin are as follows: the protein is the same at 0.04%, the highest fat in the Menja cultivar (Pandanus austrosinensis) is 99.35%; Mengkin cultivars 98.46%; and Edewewits 98.06%. Consecutive water levels of the Menja cultivars (Pandanus austrosinensis) by 0.71%, Edewewits by 0.46%, and Mengkin by 0.40%. The successive values of the Edewewits cultivar were 4.95 milliequivalents/1000 g, Pandanus austrosinensis were 4.91 mEq/kg, and the Mengkin cultivar was 2.96 milliequivalents/1000 g. The dominant fatty acid content; Menja cultivars (Pandanus austrosinensis): oleic acid 70.55%, palmiticic acid 10.45%; Edewewits cultivar: oalmitic acid 72.00%; Mengkin kutivar: oleic acid 63.76% and palmitic acid 16.56%.