bluuebunny/crossref_metadata_2025_split huggingface dataset:
Terahertz waves polarization rotation in photoexcited single-wall carbon nanotube thin film
Authors: Kvitsinskiy A , Demchenko P , Novoselov M , Anoshkin I , Bogdanov K , Baranov A , Khodzitsky M 
Published: December 2020

Abstract
Terahertz time-domain spectroscopic polarimetry (THz-TDSP) method was used to experimental study polarization properties of unaligned single-wall carbon nanotube thin films with di˙erent geometric parameters on transparent float glass substrates in a frequency range from 0.2 THz to 0.8 THz (corresponding to a wavelength range from ∼1.50 mm to ∼0.37 mm) at a controlled room temperature of 291–293 K, and a relative humidity of 40–45 %. Frequency dependences of azimuth and ellipticity angles of a polarization ellipse (PE) of electromagnetic waves transmitted through the samples, and PEs at the frequencies of 0.2 THz, 0.5 THz, and 0.8 THz were obtained for values of 0.2 Wcm
−
2, 0.6 Wcm
−
2, and 1.0 Wcm
−
2 of an external 980 nm near infrared optical pumping, with an external static magnetic field of ∼0.3 T. Polarization properties were calculated from temporal waveforms of signals transmitted through the samples at the parallel and the crossed by 45° positions to a transmission direction of the polarizers. A change of 15° in the azimuth angle, and of 10° in the ellipticity angle was achieved. The results show that by using carbon nanomaterials-based structures it is possible to devise efficient and affordable magneto-optically tunable polarization modulators that can be used in the advanced areas of terahertz nanoscience and nanotechnologies.
Thermal poling of glasses to fabricate masks for ion exchange
Authors: Babich E , Reduto I , Redkov A , Reshetov I , Zhurikhina V , Lipovskii A 
Published: December 2020

AbstractIt has been demonstrated that thermally poled regions of silicate glasses are capable of blocking penetration of silver ions into the glasses in the course of ion exchange processing. This allows using locally poled regions of the glass surface as thick dielectric masks in the formation of ion exchanged structures, like channel optical waveguides, in glass substrates. This approach provides easy multiplication of the structures and, being based on the thermal electric field imprinting of the masks, allows avoiding both lithography with the use of liquid chemicals and the influence of metal masks on the spatial distribution of the ions penetrating the glass in the ion exchange.
Investigation of energy transitions in MoS2 by photoreflectance spectroscopy method
Authors: Mihin A O , Firsov D D , Komkov O S 
Published: December 2020

Abstract
Photoreflectance spectroscopy was used to study the energy spectra of natural molybdenum disulfide samples at various temperatures. Measurements using Fourier transform infrared spectrometer make it possible to observe a fine structure in the photoreflectance spectra which appears due to transitions involving excited excitonic states. The K-exciton binding energy obtained from our experiments is about 90 meV. In addition, an optical transition involving the excited state from the H-point of the Brillouin zone was observed, and the corresponding H-exciton binding energy was found to be 77 meV.
Development of focusing grating couplers for lithium niobate on insulator platform
Authors: Elmanov I , Sardi F , Xia K , Kornher T , Kovalyuk V , Prokhodtsov A , An P , Kuzin A , Elmanova A , Goltsman G , Kolesov R 
Published: December 2020

Abstract
In this paper, we fabricate and experimentally study focusing grating couplers for lithium niobate on an insulator photonic platform. The transmittance of a waveguide equipped with in- and out-couplers with respect to the grating period is measured with and without silicon dioxide cladding applied. Our results show the influence of silicon dioxide cladding on the efficiency and the central wavelength of grating couplers and can be used to improve grating coupling efficiency. Our study is supported by numerical simulations.
The research of temperature instability influence of optic communication line on the phase difference a deep-sea direction finder
Authors: Smirnova S M , Nikolaev D I , Davydov V V 
Published: December 2020

Abstract
The article of the methods for coordinates determination of the object coordinates are reviewed. The advantages of a passive method with the using of the direction finder are noted. The problems arising from the transmission of signals in the direction finder method are determined. The construction for the signal transmission of the fiber optic communication line is presented. It is established that the greatest influence on the error in determining the coordinates of the object by direction finder has a phase shift in the optical fiber during a change the temperature. The chart of the phase shift at the temperature for various cases of optical fiber placement are investigated. The obtained data of the experimental investigations are presented.
Comparison single- and double- spot detection efficiencies of SSPD based to MoSi and NbN films
Authors: Polyakova M I , Korneev A A , Semenov A V 
Published: December 2020

Abstract
In this work, we present results of quantum detector tomography of superconducting single photon detector (SSPD) based on MoSi film, and compare them with previously reported data on NbN. We find that for both materials hot spot interaction length coincides with the strip width, and the dependence of single and double-spot detection efficiencies on bias current are compatible with sufficiently large hot-spot size, approaching the strip width.
Bipolar resistive switching in memristors based on Ge/Si(001) epitaxial layers
Authors: Gorshkov O , Filatov D , Koveshnikov S , Shenina M , Soltanovich O , Shengurov V , Denisov S , Chalkov V , Antonov I , Pavlov D , Vorontsov V , Kruglov A , Yakimov E 
Published: December 2020

Abstract
The Ag/Ge/Si(001) stacks with threading dislocations in Ge layer demonstrating the I-V curves typical for the bipolar resistive switching were investigated. Cross-sectional transmission electron microscopy and electron beam induced current measurement confirmed the resistive switching mechanism to be the formation of conductive filaments consisting of the Ag atoms across the entire Ge layer via the electric-field driven transport of Ag+ ions along the threading dislocations.
Research of a micromechanical accelerometer with three sensitivity axes
Authors: Lysenko I E , Ezhova O A , Tkachenko A V , Naumenko D V 
Published: December 2020

Abstract
Micromechanical linear acceleration sensors are widely used in modern inertial orientation and navigation systems of technical equipment used in industry. The paper presents the developed design of MEMS linear acceleration sensor with three sensitivity axes, modal and static analysis is performed, design parameters are found that ensure equality of natural frequencies along the sensitivity axes, and experimental samples are created and studied.
Modeling of dispersive transport with inhomogeneous advection coefficient and memory kernel
Authors: Morozova E. V. 
Published: December 2020

Abstract
Dispersive transport in structures with spatially dependent memory kernel and advection coefficient V is considered. The variations in Φ and V can be related to a nonuniformly distributed electric field or to inhomogeneities in the spatial distribution of localized states. The transient current of the time-of-flight technique is calculated after neglecting the diffusion term. An explicit representation is obtained for a linear decrease in V (x) over the sample thickness for normal and dispersive transport. The variation in Φ and V leads to additional smearing of non-equilibrium particle package. Dispersive transient current curves can be observed even for normal transport for certain inhomogeneities in the advection term.
Study of the relationship of induction heating parameters and mechanical properties of commercial purity titanium
Authors: Shchelkunov A , Fomina M 
Published: December 2020

Abstract
In this work, the relationship between the parameters of voltage, inductor current, duration, temperature of induction heat treatment and the hardness of commercial purity titanium was studied. As a result, the temperature ranges at a fixed voltage and current of the inductor were established. At certain technological conditions, with various durations of heat treatment, the hardness of the titanium surface was determined.
Modification of glass durability in reactive ion etching with thermal poling and ion exchange
Authors: Raskhodchikov D V , Babich E S , Kaasik V. P. , Reshetov I V , Lipovskii A A 
Published: December 2020

Abstract
The influence of thermal poling and ion exchange on the rate of reactive ion etching of a soda-lime silicate glass in CF4-Ar plasma was studied. It is shown that the replacement of Na+ by Ag+ ions increases the durability of the glass etching while thermal poling of the glass increases the etching rate. The fastest etching was registered for the glasses poled using deposited metal film anodic electrode and using corona discharge in nitrogen atmosphere. Corona poling of the glass in atmospheric air instead of nitrogen essentially decreased the rate.
Analysis of a nanometer catalyst layer using various methods of spraying an active catalytic coating of an ion-exchange polymer membrane embedded in an electrolytic hydrogen cell
Authors: Gurin S A , Pecherskaya E A , Nesterov S A , Shelakhaev D A , Fimin A V 
Published: December 2020

Abstract
Today, the industrial production of hydrogen by traditional methods (high-temperature conversion of hydrocarbons, steam-water conversion of natural gas) against the background of a reduction in natural resources does not allow achieving the necessary purity of the produced gas and imposes serious economic and environmental restrictions. As a result, the solution of the task of developing technologies providing the improvement, high specific and operational characteristics of new methods for producing hydrogen is extremely urgent.
Study of spontaneous bioelectrical activity of two hierarchically connected neural networks in vitro
Authors: Pigareva Y , Grinchuk O , Gladkov A , Kolpakov V , Bukatin A , Kazantsev V , Mukhina I , Pimashkin A 
Published: December 2020

Abstract
Synchronization of neuronal subpopulations and spiking pattern propagation are essential features for bioelectrical activity of the brain. In this study, we proposed an engineering method to grow hierarchically connected networks in vitro through the microchannels and investigated the relations of local spiking propagation through the microchannels with integrated bursting events in the chambers.
Defect properties of multilayer GaP/Si nanoheterostructures grown by plasma deposition
Authors: Baranov A I , Morozov I A , Uvarov A V , Kudryashov D A , Gudovskikh A S 
Published: December 2020

Abstract
Periodic nanoheterostructures GaP/Si grown by PE-ALD with argon plasma treatment on GaP wafers were studied by capacitance methods. The response from silicon quantum well was clearly observed by capacitance-voltage characteristics as peak on profile of concentration of free charge carriers in sample GaP (50 cycles)/Si (22 s) with 7 wells. It is explained by higher doping of GaP layers due to higher total time of silane flow in growth process unlike samples with smaller numbers of silicon wells or lower time of silicon deposition. Further, response from defect level was observed with capture cross-section (1–10)×10−15 cm−2, and its energetic level decreases from 0.51 eV to 0.39 eV under conduction band with increasing of total time of silane flow.
Recycling of Pineapple (Ananas comosus) Leaf Agro-waste as One of the Raw Materials for Production of Eco-friendly New Paper
Authors: Teo Pao Ter , Zakaria Siti Koriah , Azhar Taib Mustaffa Ali , Budiman Faisal , Mohamed Mazlan , Yusoff Abdul Hafidz , Ahmad Sobri Sharizal 
Published: December 2020

Abstract
This project aimed to recycle pineapple (Ananas comosus) leaf agro-waste and wastepaper into new paper using simple processing routes that involve pulping, mixing, sieving, compaction and drying. Subsequently, physical and mechanical properties, as well as the morphology of the pineapple leaf fiber (PALF)-based paper were investigated accordingly. Two different samples were prepared whereby the first sample is pineapple leaf fiber mixed with wastepaper, and another sample is pure pineapple leaf fiber paper. The samples were tested for tensile properties by using the universal testing machine, morphological analysis using scanning electron microscopy, and density measurement using a densitometer. It was found that the sample consist of pineapple leaf and wastepaper shows a higher tensile strength than the sample containing only PALF. Moreover, the density of paper with pineapple leaf fiber and wastepaper mix was higher than the paper with only pineapple leaf fiber. In the future, further modification of body formulation is necessary to further improve the properties of the pineapple leaf fiber-based paper.
Box-Behnken-Design based optimization strategy for alkaline pretreatment of palm oil mill effluent for producing reducing sugar
Authors: Izzi AZ , Yusuf NNAN , Ishak WFW , Kim H 
Published: December 2020

Abstract
Alkaline pretreatment is used as a substrate prior to subsequent biological processes for palm oil mill effluent (POME) treatment. In the present study, Sodium hydroxide (NaOH) was used to recover reducing sugar from POME. Important process parameters, such as reaction time (min), reaction temperature (°C), and concentration (%) (w/v), were optimized using Box-Behnken Design in Response Surface Methodology (RSM). POME treated with NaOH yielded the reducing sugar of up to 3640.84 mg/L under the optimum conditions of 58.78 min, 77.06°C, and 2.58% (w/v) for reaction time, reaction temperature, and concentration of NaOH, respectively. The analysis of variance (ANOVA) indicated that the quadratic model for reducing sugar production had an R2 coefficient of 0.979. Conformity testing for optimum conditions proved the validity of the model, yielding reducing sugar at a 9.35% increase, relative to untreated POME. This study verified the importance of statistical tools such as RSM for enhanced reducing sugar production from the industrial waste stream (POME) and its usefulness and efficiency in energy conversion.
Comparative Efficacy of Estrus Synchronisation between Modified Herbs and Control Internal Drug Release (CIDR) in Goats
Authors: Nur Nazhiifah Amiirah M.S. , Khairatun Nisaa’ A.B. , Raja Ili Airina R.K. 
Published: December 2020

AbstractEstrus synchronisation promises proper breeding management where manipulation of the estrus cycle in animals was achieved at the same time. Control Internal Drug Release (CIDR) is a common practice and commercially used to obtain estrus in the female goats. Conversely, this method is expensive with several limitations. Alternatively, specific herbs were proved to have beneficial effects and therapeutic properties towards animals. Thus, the objective of the present study was to analyse the efficacy of estrus synchronisation using herbs and CIDR in goats. The female goats were divided randomly into two groups, (A) CIDR (n=4) and (B) herbs (n=4). The female goats were inserted with CIDR application devices, feeding with herbs and allow to response to estrus naturally for group (A) and (B) respectively. The estrus signs were observed four times daily (0900, 1200, 1500 and 1800 hours, respectively) after CIDR withdrawal (n=14 days) and feeding herbs (n=3 days) respectively. The results indicated that estrus detection was higher in herbs compared to CIDR (80.56% vs 77.78%, respectively) while conception and pregnancy rate was 100%, for both groups. Pregnancy was confirmed with ultrasound scanning at the second trimester of gestation. The onset of estrus was earlier in the females treated with CIDR than those in herbs (22.15h vs 24.4h, respectively). The maximum estrus duration in this study was recorded at 57.5h and 56h for CIDR and herbs, respectively. The estrus response for CIDR and herbs were higher in the morning 100%, for both compared to evening (66.67% vs 83.3%, respectively). In conclusion, the current study suggests that the utilization of herbs for estrus synchronisation is possible because both treatments gave similar result.
Plant Cell and Callus Cultures as an Alternative Source of Bioactive Compounds with Therapeutic Potential against Coronavirus Disease (COVID-19)
Authors: Ferid A , Mohammed Arifullah , Khalivulla Shaik Ibrahim , Korivi Mallikarjuna , Abdul Razab Mohammad Khairul Azhar 
Published: December 2020

Abstract
Plant cell and callus cultures are important tools for the mass production of bioactive compounds (secondary metabolites) from plants cell or tissue under a controlled environment. From past few decades the bioactive compounds assumed to play a key role in the development of novel drugs against several viral diseases, causing serious threat and even death to thousands of human lives. The recent, pandemic coronavirus disease (COVID-19) outbreak upraised the importance of developing an effective therapeutic drug or vaccine as quick as possible to treat or prevent further spread. The research studies are in progress to find coronavirus therapeutics among existing antiviral drugs. Of these drugs, hydroxychloroquine and azithromycin have emerged as frontrunners and shown early promising results in treating COVID-19 in both in vitro and in vivo studies. However, these drugs have adverse side-effects and they became ineffectual due to eventual drug-resistance. Research is continuing by several means in search of potential therapeutics with minimal side-effects. The natural bioactive compounds from a plant sources generally have minimal toxicity can exert inhibitory capacity against coronavirus is of great interest. Up to now, various phytochemical compounds, namely arctiin, scutellarin, forsythoside, kaempferol, secoxyloganin, nicotianamine, saikosaponin, reported to have anti-SARS-CoV-2 activity. The mechanism of action appears to be inhibiting virus replication and blocking viral infection. Due to time taking cultivation, expensive extraction and isolation of bioactive constituents, it is essential to develop alternative techniques for the mass production of bioactive compounds in a less timeframe using in vitro methods of plant cell and callus culture methods. In the present work, we highlighted the importance of modern biotechnological approaches including cell or tissue or callus culture methods and plant-based antiviral compounds currently being tested to treat novel coronavirus.
Research on Piezoelectric Energy harvesting from Multi-Direction Wind-Induced Vibrations
Authors: Chen Yuansheng , Gu Cong , Zhao Pengcheng , Chen Wei 
Published: December 2020

Abstract
Micro electric devices have been widely applied in outdoor field work, but the battery power limits its performance. Piezoelectric energy harvesting from wind-induced vibration is an attractive power solution for the micro electric devices in field work. Its output characteristics of proposed system is analysed under different wind speed and direction. Experimental results show that the proposed system can harvest more energy if the incoming flow is parallel to the piezoelectric plate. Its output voltage increases from 2.5V to 10.3V when the wind speed ranges from 9m/s to 21m/s. The output voltage can achieve 8.5V, if the flow direction is vertical to the piezoelectric plate. But the proposed harvesting system outputs very small voltage in case the flow direction from the top. These results show that the piezoelectric energy harvesting system can collect the wind energy from multi-direction, and have potential application to power the micro electric devices.
Reconstruction of High-order Harmonic Signal in AT Power Supply System
Authors: Wei Zhende , Lv Xiaoqiang 
Published: December 2020

Abstract
In the process of power transmission, power quality disturbance is caused by the phenomenon of “excitation inrush current” and “leakage resistance” of the core equipment AT in the power supply system. Harmonic signals contain higher harmonics. In this paper, the power supply system under AT mode is modeled, and a damping trapezoidal algorithm is proposed to suppress the numerical oscillations caused by the coupling between AT windings. A new orthogonal matching pursuit algorithm for multi-spectral interpolation correction is proposed. (OMP-MIC), reconstructing the occurrence of higher harmonic signals, improving reconstruction efficiency and accurately recovering the original signal; finally, verifying the validity of the model and the superiority of the reconstruction algorithm through simulation.
Analysis of Abnormal Ground Current in 110kV Cable Line
Authors: Xiaopo Mao , Yi Kan , Yaodong Zhang , Zeqi Huang , Xiang Ren , Xueming Zhou , Zhiqiang Feng 
Published: December 2020

Abstract
In recent years, with the development of economy and the rapid growth of electricity consumption, the number and length of medium and high voltage cable lines have increased rapidly. As an important part of the power transmission and distribution network, to ensure the safe and reliable operation of cable lines and reduce unplanned power outages. Based on the field test and analysis of the abnormal ground current of the 110kV Luoyong line, it is found that the cross interconnection system has many defects such as phase sequence error and identification plate indication error. It is recommended that the cable cross interconnection system carry out a segmented insulation resistance test to exclude cables. Hidden dangers such as damage to the protective layer and damage to the protective layer.
Analysis on Differential Protection Sensitivity of Traction Transformers Based on Different Conversion Modes
Authors: Xiaobao Liu , Yuping Zheng , feng Long , Tonghua Wu , Shuyan Pan , Lin An 
Published: December 2020

Abstract
With the rapid development of high-speed rail technology in China, the traction transformers of various types have been used more and more extensively. The differential protection of traction transformers has different differential conversion modes [1-2] which are different in their sensitivities. In this paper, taking the YNV traction transformer as an example, by comparing the sensitivities of two different common differential conversion modes and through analysis, it shows that the sensitivities of differential protection are slightly different. The sensitivities of differential protections based on different principles depend on the retention degree of differential current to the positive sequence, negative sequence and zero sequence components in the internal fault current. The sensitivity of phase current minus zero sequence differential is the highest when single-phase grounded, which completely retains all the sequence components in the internal fault current. The sensitivity of interphase differential protection is the highest when interphase fault occurs. The widely used phase current differential and phase current minus zero sequence differential do not reflect the zero-sequence component of internal fault current, which provides the basis for field fault analysis and setting.