bluuebunny/crossref_metadata_2025 huggingface dataset:
Impact of green manures of Vernonia amygdalina and Chromolaena odorata on growth, yield, mineral and proximate composition of Radish (Raphanus sativus L.)
Authors: Aboyeji Christopher Muyiwa
Published: November 2019

Field experiments were carried out during the 2016 and 2017 cropping seasons at the Teaching and Research Farm, Landmark University, Omu-Aran, Kwara State (latitude 8.9°N and longitude 50°61 E.), Nigeria, to study the effect of some green manures as an alternative to inorganic fertilizer on growth, yield, mineral and proximate composition of radish. Green manure composed of leaves of Vernonia amygdalina and Chromolaena odorata and were applied as follows: 10 tonnes ha−1 vernonia + 0 tonnes ha−1 chromolaena (T1), 7.5 tonnes ha−1 vernonia + 2.5 tonnes ha−1 chromolaena (T2), 5.0 tonnes ha−1 vernonia + 5.0 tonnes ha−1 chromolaena (T3), 2.5 tonnes ha−1 Vernonia + 7.5 tonnes ha−1 chromolaena (T4), 0 tonnes ha−1 vernonia + 10 tonnes ha−1 chromolaena (T5) while in-organic fertilizer (NPK 20:10:10) was applied at 200 kg NPK ha−1 (T6) and there was a control plot (T7). The experiment was laid out in a Randomized Complete Block Design (RCBD) replicated four times. Vegetative, yield and quality parameters of radish were taken. Data collected were subjected to Analysis of Variance (ANOVA) using Statistical Analysis Software (S.A.S), 2000. Treatment means were compared using Duncan Multiple Range Test (DMRT) at 0.05 level of probability. The study showed that application of green manures increased vegetative, yield and yield parameters and were comparable with application of NPK fertilizer while there was a significant increase in the nutritional composition of radish with application of green manures when compared with NPK and control. It can therefore be concluded that application 10 tonnes ha−1 vernonia + 0 tonnes ha−1 chromolaena (T1) as green manure increased vegetative, yield and yield parameters while application 7.5 tonnes ha−1 vernonia + 2.5 tonnes ha−1 chromolaena (T2) improved radish quality.
Track Structure Study for Energy Dependency of Electrons and X-rays on DNA Double-Strand Break Induction
Authors: Yachi Yoshie , Yoshii Yuji , Matsuya Yusuke , Mori Ryosuke , Oikawa Joma , Date Hiroyuki
Published: November 2019

Radiation weighting factor wR for photons and electrons has been defined as unity independently of the energy of the particles. However, the biological effects depend on the incident energies according to in vitro experimental data. In this study, we have quantified the energy concentration along electron tracks in terms of dose-mean lineal energy (yD) on chromosome (micro-meter) and DNA (nano-meter) order scales by Monte Carlo simulations, and evaluated the impact of photon energies on DNA double-strand break (DNA-DSB) induction from an experimental study of irradiated cells. Our simulation result shows that the yD values for diagnostic X-rays (60–250 kVp) are higher than that for therapeutic X-rays (linac 6 MV), which agrees well with the tissue equivalent proportional counter (TEPC) measurements. The relation between the yD values and the numbers of γ-H2AX foci for various photon energy spectra suggests that low energy X-rays induce DNA-DSB more efficiently than higher energy X-rays even at the same absorbed dose (e.g., 1.0 Gy). The relative biological effectiveness based on DNA-DSBs number (RBEDSB) is proportionally enhanced as the yD value increases, demonstrating that the biological impact of the photon irradiation depends on energy concentration along radiation tracks of electrons produced in the bio-tissues. Ultimately, our study implies that the value of wR for photons varies depending on their energies.
Subtype I (intrinsic) adenomyosis is an independent risk factor for dienogest-related serious unpredictable bleeding in patients with symptomatic adenomyosis
Authors: Matsubara Sho , Kawaguchi Ryuji , Akinishi Mika , Nagayasu Mika , Iwai Kana , Niiro Emiko , Yamada Yuki , Tanase Yasuhito , Kobayashi Hiroshi
Published: November 2019

We aimed to retrospectively analyze the risk factors of a continuous dienogest (DNG) therapy for serious unpredictable bleeding in patients with symptomatic adenomyosis. This is a retrospective study based on data extracted from medical records of 84 women treated with 2 mg of DNG orally each day between 2008 and 2017. 47 subjects were excluded from the original analyses due to an inadequate subcategorization into subtype I and subtype II and a lack of hemoglobin levels. The influence of various independent variables on serious unpredictable bleeding was assessed. Of the 37 eligible patients who received the continuous DNG therapy, 14 patients experienced serious unpredictable bleeding. Univariate analysis revealed that the serious bleeding group had subtype I adenomyosis (P = 0.027). There was no correlation between age, parity, minimum hemoglobin level before treatment, previous endometrial curettage, and duration of DNG administration, or uterine or adenomyosis size and the serious bleeding. A DNG-related serious unpredictable bleeding is associated with the structural type of adenomyosis (subtype I) in patients with symptomatic adenomyosis.
Bacterial cellulose films with ZnO nanoparticles and propolis extracts: Synergistic antimicrobial effect
Authors: Mocanu Alexandra , Isopencu Gabriela , Busuioc Cristina , Popa Oana-Maria , Dietrich Paul , Socaciu-Siebert Liana
Published: November 2019

This study aimed to obtain possible materials for future antimicrobial food packaging applications based on biodegradable bacterial cellulose (BC). BC is a fermentation product obtained by Gluconacetobacter xylinum using food or agricultural wastes as substrate. In this work we investigated the synergistic effect of zinc oxide nanoparticles (ZnO NPs) and propolis extracts deposited on BC. ZnO NPs were generated in the presence of ultrasounds directly on the surface of BC films. The BC-ZnO composites were further impregnated with ethanolic propolis extracts (EEP) with different concentrations.The composition of raw propolis and EEP were previously determined by gas-chromatography mass-spectrometry (GC-MS), while the antioxidant activity was evaluated by TEAC (Trolox equivalent antioxidant capacity). The analysis methods performed on BC-ZnO composites such as scanning electron microscopy (SEM), thermo-gravimetrically analysis (TGA), and energy-dispersive X-ray spectroscopy (EDX) proved that ZnO NPs were formed and embedded in the whole structure of BC films. The BC-ZnO-propolis films were characterized by SEM and X-ray photon spectroscopy (XPS) in order to investigate the surface modifications. The antimicrobial synergistic effect of the BC-ZnO-propolis films were evaluated against Escherichia coli, Bacillus subtilis, and Candida albicans. The experimental results revealed that BC-ZnO had no influence on Gram-negative and eukaryotic cells.
Increase in negative charge of 68Ga/chelator complex reduces unspecific hepatic uptake but does not improve imaging properties of HER3-targeting affibody molecules
Authors: Rinne Sara S. , Dahlsson Leitao Charles , Gentry Joshua , Mitran Bogdan , Abouzayed Ayman , Tolmachev Vladimir , Ståhl Stefan , Löfblom John , Orlova Anna
Published: November 2019

Upregulation of the human epidermal growth factor receptor type 3 (HER3) is a common mechanism to bypass HER-targeted cancer therapy. Affibody-based molecular imaging has the potential for detecting and monitoring HER3 expression during treatment. In this study, we compared the imaging properties of newly generated 68Ga-labeled anti-HER3 affibody molecules (HE)3-ZHER3-DOTA and (HE)3-ZHER3-DOTAGA with previously reported [68Ga]Ga-(HE)3-ZHER3-NODAGA. We hypothesized that increasing the negative charge of the gallium-68/chelator complex would reduce hepatic uptake, which could lead to improved contrast of anti-HER3 affibody-based PET-imaging of HER3 expression. (HE)3-ZHER3-X (X = DOTA, DOTAGA) were produced and labeled with gallium-68. Binding of the new conjugates was specific in HER3 expressing BxPC-3 and DU145 human cancer cells. Biodistribution and in vivo specificity was studied in BxPC-3 xenograft bearing Balb/c nu/nu mice 3 h pi. DOTA- and DOTAGA-containing conjugates had significantly higher concentration in blood than [68Ga]Ga-(HE)3-ZHER3-NODAGA. Presence of the negatively charged 68Ga-DOTAGA complex reduced the unspecific hepatic uptake, but did not improve overall biodistribution of the conjugate. [68Ga]Ga-(HE)3-ZHER3-DOTAGA and [68Ga]Ga-(HE)3-ZHER3-NODAGA had similar tumor-to-liver ratios, but [68Ga]Ga-(HE)3-ZHER3-NODAGA had the highest tumor uptake and tumor-to-blood ratio among the tested conjugates. In conclusion, [68Ga]Ga-(HE)3-ZHER3-NODAGA remains the favorable variant for PET imaging of HER3 expression.
Using long and linked reads to improve an Atlantic herring (Clupea harengus) genome assembly
Authors: í Kongsstovu Sunnvør , Mikalsen Svein-Ole , Homrum Eydna í , Jacobsen Jan Arge , Flicek Paul , Dahl Hans Atli
Published: November 2019

Atlantic herring (Clupea harengus) is one of the most abundant fish species in the world. It is an important economical and nutritional resource, as well as a crucial part of the North Atlantic ecosystem. In 2016, a draft herring genome assembly was published. Being a species of such importance, we sought to independently verify and potentially improve the herring genome assembly. We sequenced the herring genome generating paired-end, mate-pair, linked and long reads. Three assembly versions of the herring genome were generated based on a de novo assembly (A1), which was scaffolded using linked and long reads (A2) and then merged with the previously published assembly (A3). The resulting assemblies were compared using parameters describing the size, fragmentation, correctness, and completeness of the assemblies. Results showed that the A2 assembly was less fragmented, more complete and more correct than A1. A3 showed improvement in fragmentation and correctness compared with A2 and the published assembly but was slightly less complete than the published assembly. Thus, we here confirmed the previously published herring assembly, and made improvements by further scaffolding the assembly and removing low-quality sequences using linked and long reads and merging of assemblies.
Crustal growth and reworking: A case study from the Erguna Massif, eastern Central Asian Orogenic Belt
Authors: Sun Chenyang , Xu Wenliang , Cawood Peter A. , Tang Jie , Zhao Shuo , Li Yu , Zhang Xiaoming
Published: November 2019

Despite being the largest accretionary orogen on Earth, the record of crustal growth and reworking of individual microcontinental massifs within the Central Asian Orogenic Belt (CAOB) remain poorly constrained. Here, we focus on zircon records from granitoids in the Erguna Massif to discuss its crustal evolution through time. Proterozoic–Mesozoic granitoids are widespread in the Erguna Massif, and spatiotemporal variations in their zircon εHf(t) values and TDM2(Hf) ages reveal the crustal heterogeneity of the massif. Crustal growth curve demonstrates that the initial crust formed in the Mesoarchean, and shows a step-like pattern with three growth periods: 2.9–2.7, 2.1–1.9, and 1.7–0.5 Ga. This suggests that microcontinental massifs in the eastern CAOB have Precambrian basement, contradicting the hypothesis of significant crustal growth during the Phanerozoic. Phases of growth are constrained by multiple tectonic settings related to supercontinent development. Calculated reworked crustal proportions and the reworking curve indicate four reworking periods at 1.86–1.78 Ga, 860–720 Ma, 500–440 Ma, and 300–120 Ma, which limited the growth rate. These periods of reworking account for the crustal heterogeneity of the Erguna Massif.
Author Correction: Silk physico-chemical variability and mechanical robustness facilitates intercontinental invasibility of a spider
Authors: Viera Carmen , Garcia Luis F. , Lacava Mariángeles , Fang Jian , Wang Xungai , Kasumovic Michael M. , Blamires Sean J.
Published: November 2019

An amendment to this paper has been published and can be accessed via a link at the top of the paper.
Aktina Vision: Full-parallax three-dimensional display with 100 million light rays
Authors: Watanabe Hayato , Okaichi Naoto , Omura Takuya , Kano Masanori , Sasaki Hisayuki , Kawakita Masahiro
Published: November 2019

Natural three-dimensional (3D) images, perceived as real objects in front of the viewer, can be displayed by faithfully reproducing light ray information. However, 3D images with sufficient characteristics for practical use cannot be displayed using conventional technologies because highly accurate reproduction of numerous light rays is required. We propose a novel full-parallax light field 3D display method named ‘Aktina Vision’, which includes a special top-hat diffusing screen with a narrow diffusion angle and an optical system for reproducing high-density light rays. Our prototype system reproduces over 100,000,000 light rays at angle intervals of less than 1° and optimally diffuses light rays with the top-hat diffusing screen. Thus, for the first time, light field 3D image reproduction with a maximum spatial resolution of approximately 330,000 pixels, which is near standard-definition television resolution and three times that of conventional light field display using a lens array, is achieved.
Publisher Correction: Decomposition and oxidation of methionine and tryptophan following irradiation with a nonequilibrium plasma jet and applications for killing cancer cells
Authors: Uchida Giichiro , Mino Yusuke , Suzuki Tensho , Ikeda Jun-ichiro , Suzuki Takashi , Takenaka Kosuke , Setsuhara Yuichi
Published: November 2019

An amendment to this paper has been published and can be accessed via a link at the top of the paper.
Direct visualization of human myosin II force generation using DNA origami-based thick filaments
Authors: Fujita Keisuke , Ohmachi Masashi , Ikezaki Keigo , Yanagida Toshio , Iwaki Mitsuhiro
Published: November 2019

The sarcomere, the minimal mechanical unit of muscle, is composed of myosins, which self-assemble into thick filaments that interact with actin-based thin filaments in a highly-structured lattice. This complex imposes a geometric restriction on myosin in force generation. However, how single myosins generate force within the restriction remains elusive and conventional synthetic filaments do not recapitulate the symmetric bipolar filaments in sarcomeres. Here we engineered thick filaments using DNA origami that incorporate human muscle myosin to directly visualize the motion of the heads during force generation in a restricted space. We found that when the head diffuses, it weakly interacts with actin filaments and then strongly binds preferentially to the forward region as a Brownian ratchet. Upon strong binding, the two-step lever-arm swing dominantly halts at the first step and occasionally reverses direction. Our results illustrate the usefulness of our DNA origami-based assay system to dissect the mechanistic details of motor proteins.
Novel and green synthesis of a nanopolymer and its use as a drug delivery system of silibinin and silymarin extracts in the olfactory ensheathing cells of rats in normal and high-glucose conditions
Authors: Shiri Sabah , Abbasi Naser , Alizadeh Kamal , Karimi Elahe
Published: November 2019

A schematic of a new synthesized nanopolymer (CGONP) and its use as a drug delivery system of silibinin and silymarin extract in the olfactory ensheathing cells (OECs) of rats in normal and high-glucose conditions.
Preparative separation of structural isomeric pentacyclic triterpene oleanolic acid and ursolic acid from natural products by pH-zone-refining countercurrent chromatography
Authors: Wang Chaoyue , Wang Xiang , Zhao Shanshan , Sun Wenyu , Tong Shengqiang
Published: November 2019

pH-zone-refining countercurrent chromatography was investigated in preparative separation of oleanolic acid and ursolic acid from three different natural products,Aralia chinensis, apple peels andEriobotrya japonicaThunb.
Enhanced catalytic activity of inhomogeneous Rh-based solid-solution alloy nanoparticles
Authors: Sarker Md Samiul Islam , Nakamura Takahiro , Kameoka Satoshi , Hayasaka Yuichiro , Yin Shu , Sato Shunichi
Published: November 2019

Catalytic Rh-based alloy nanoparticles (NPs) with inhomogeneous solid-solution structures were prepared from homogeneous solid-solution alloy NPs.
Laccase-immobilized tannic acid-mediated surface modification of halloysite nanotubes for efficient bisphenol-A degradation
Authors: Zhang Liting , Tang Wen , Ma Tonghao , Zhou Lina , Hui Chenggong , Wang Xiaoli , Wang Ping , Zhang Changai , Chen Chao
Published: November 2019

We report a simple tannic acid (TA)-mediated surface modification strategy for the fabrication of HNT-based efficient enzyme immobilization supports.
Formation of sulfur trioxide during the SCR of NO with NH3over a V2O5/TiO2catalyst
Authors: Xiong Jin , Li Yuran , Lin Yuting , Zhu Tingyu
Published: November 2019

Formation of SO3over a V2O5/TiO2catalyst involves SO2adsorption, SO2oxidation and SO3desorption. NOxpromotes the SO2oxidation due to the valence transition of vanadium. H2O or NH3inhibits the SO3desorption due to the formation of sulfate.
Assembly of reduced graphene oxides into a three-dimensional porous structure via confinement within robust cellulose oligomer networks
Authors: Hata Yuuki , Saito Yoshitaka , Sawada Toshiki , Matsumoto Hidetoshi , Serizawa Takeshi
Published: November 2019

Reduced graphene oxides were assembled into a fine porous structure via confinement within robust cellulose oligomer networks.
An antimonene/Cp*Rh(phen)Cl/black phosphorus hybrid nanosheet-based Z-scheme artificial photosynthesis for enhanced photo/bio-catalytic CO2 reduction
Authors: Ji Xiaoyuan , Kang Yong , Fan Taojian , Xiong Qingqing , Zhang Songping , Tao Wei , Zhang Han
Published: November 2019

A biomimicking Z-scheme photocatalytic system was constructed using dual-functionalized polymer covalent cross-linking electron mediator to catenate antimonene and black phosphorus nanosheets.
Branched polymer-incorporated multi-layered heterostructured photoanode: precisely tuning directional charge transfer toward solar water oxidation
Authors: Wei Zhi-Quan , Dai Xiao-Cheng , Hou Shuo , Li Yu-Bing , Huang Ming-Hui , Li Tao , Xu Shuai , Xiao Fang-Xing
Published: November 2019

Two unidirectional electron and hole transfer channels were simultaneously constructed in a multilayered heterostructured photoanode via an efficient layer-by-layer assembly for solar-driven water oxidation.
Identifying high-mobility tetracene derivatives using a non-adiabatic molecular dynamics approach
Authors: Ziogos Orestis George , Giannini Samuele , Ellis Matthew , Blumberger Jochen
Published: November 2019

Alkylated tetracenes offer an attractive route towards flexible columnar organic electronics applications with unprecedented hole mobilities and robust charge transfer mechanisms.
Bifurcation transition in a system of two microwave oscillators during coherence destruction
Authors: Novikov Sergey
Published: November 2019

The fine structure of bifurcation changes of oscillatory regimes in a system of two microwave oscillators in the region of mutual resonant strong coupling is experimentally investigated. Briefly discusses the methods for circuit implementation of strong resonant interactions, as well as their analytical threshold, above which synchronous modes lose stability and the system goes into dynamic chaos mode.
Construction of models of microwave transistors when changing the probing signal in the frequency and power range
Authors: Evseev Vladimir , Ivlev Mikhail , Morugin Stanislav , Nikulin Sergey
Published: November 2019

It is shown that to model a transistor in the form of S-parameters in the large signal mode, it is necessary to present the model as two S-matrices that describe the transistor at two phase differences between the incident and reflected waves equal to 0 and 90 degrees. The problem of matching a transistor with a load is reduced to solving a nonlinear equation with respect to a previously unknown phase difference, after which the load impedance is selected from the complex-conjugate matching condition.
Methods for mutual time delay estimation of wideband signals based on nonlinear digital filtering
Authors: Ershov Roman , Morozov Oleg
Published: November 2019

Methods for mutual time delay estimation of wideband signals propagating in satellite communication systems are proposed. The signals are propagated in different channels and received with low signal-to-noise ratio. A characteristic feature of satellite channel is the presence of the Doppler Effect, which leads to a shift and scaling the signal spectrums. The proposed approaches are based on the separation of narrow-band channels from the studied signals, using non-linear digital filtering algorithms in each channel, and subsequent optimal (correlation) processing. The accuracy of the proposed methods and the reliability of the determination of time delay are investigated.
Ultra-wideband chaotic radio pulse reception in the case of inter-pulse interference
Authors: Kuzmin Lev , Grinevich Alexander
Published: November 2019

The problem of receiving ultra-wideband (UWB) chaotic radio pulses of microwave band that passed through a multipath channel is considered. Based on measurements of UWB chaotic radio pulse propagation through a real wireless channel, a method for reception is proposed that is not affected by interpulse interference.
Formation the radio signal for the system of space-time signal processing
Authors: Gelozhe Yuri , Klimenko Pavel , Maksimov Aleksander
Published: November 2019

The work is devoted to digital information transmission systems using space-time signal processing. The formation of radio signals whose carrier frequencies are determined by the frequency-time matrices is considered. The signal shaper is based on a PLL system with a programmable frequency divider. The analysis of the processes in the phase automatic system under the influence of large destabilizing factors and frequency switching of the generated oscillations is carried out. It is theoretically and experimentally shown that in the above-mentioned conditions the automatic system may lose stability. The algorithm for controlling the PLL has been developed, which ensures the stability of processes under large disturbances. Experimental studies have been carried out that have shown the efficiency of the improved system.
Methods for broadband signals mutual time delays estimating enhancement
Authors: Grin Ilya , Morozov Oleg
Published: November 2019

This paper considers methods for estimating the mutual time delay of broadband signals recorded by satellites based multi-position systems for determining the location of a radiation source. All methods considered are based on modified algorithms for calculating the ambiguity function. The presented algorithms are based on the extraction of narrowband channels from the studied signals and their further optimal processing. The reliability criterion for mutual time delay estimation by the presented methods was evaluated. Based on the results and analysis of computational efficiency, viability of methods considered and their modifications was determined.
Assessment of the applicability of the known principles of implementation of ground-based radio systems for problem solving of spacecraft control and identification
Authors: Polyakov A. L. , Afonin I. L. , Polyakov D. A.
Published: November 2019

The creation of separate radio systems for solving the task of identifying spacecraft (SC) for uncontrolled radiation of on-board equipment requires considerable expenses, which makes it expedient to create hardware identification means as part of the already existing ground- based radio systems used for providing spacecraft control.
Test data distribution system for OSS/BSS-systems testing
Authors: Nikolaev Steven , Sitnikov Igor
Published: November 2019

OSS/BSS-systems used by telecommunication companies to conduct their business are a combination of several subsystems that closely interact with each other. Since the activities of telecommunications companies are related to the processing of personal data of individuals and legal entities, such systems should be subjected to testing, which should continue until the end of the life cycle. The huge size of telecommunications companies' databases, as well as the number of tests required to cover the entire functionality of OSS/BSS-systems are an obstacle to conducting rapid testing. This article describes an approach to testing organization that solves this problem, based on the selection and keeping the test data up to date. The effectiveness of the proposed approach has been demonstrated experimentally.
Cell search and synchronization in 5G NR
Authors: Kryukov Yakov , Pokamestov Dmitriy , Rogozhnikov Eugeniy
Published: November 2019

An overview of the physical signals foreseen by the 3GPP 5G New Radio specification for frame synchronization and cell search in fifth- generation wireless broadband access systems is presented in the paper. The frame synchronization algorithm and the cell initialization procedure are demonstrated. An estimate of probability of error detection of a physical identifier by the signals of the primary and secondary synchronization is obtained. The comparison of the successful synchronization in AWGN channel for 4G LTE and 5G NR is shown.
Design ICCreatech semiconductor wafer accounting and probe measurement automatization software
Authors: Argunov Dmitry , Shiryaev Boris , Bezruk Alexey , Yushenko Alexey
Published: November 2019

The different manufacturing processes automatization and creating a modern digital document transferring system is an important problem for enhancing factory performance. This paper presents the results of developing an automated information system for manufacturing monolithic integrated circuits. Server and client solutions have been developed supported features of electronic covering documents, making automated on-wafer electrical characteristics measurement, and measurement data analysis.
Applying intelligent methods of risk analysis in information communication systems
Authors: Maslova Maria
Published: November 2019

In the modern world there is a constant growth of information and information technologies, a risk-oriented approach to managing information security of information and communication systems of companies seems increasingly promising. But apart from development, there are threats and risks that affect both the image and the financial component of companies. Therefore, one of the main tasks is to assess, analyze and prevent the risks of information security in information communication systems using modern methods in conjunction with the use of intelligent analysis methods.
Optical visibility range estimation device for safety improvement of unmanned navigation
Authors: Nacharov Denis , Mickhayluck Yurij
Published: November 2019

Novel methodology for daytime optical visibility range estimation using digital images is presented. Proposed methodology is proved to be effective by results of computational experiments that are presented in this article. Technical suggestions about calibration, hardware and software requirements visibility range estimation device are made.
Design and analysis of the digital phased antennas characteristics using modern systems of the atomized design (CAD)
Authors: Burykin Andrey , Kuprits Vladimir , Mescheryakov Alexander
Published: November 2019

There are discussed methods of the digital phased antennas design using the modern (computer aided design) CAD. There are given examples of digital antenna blocks and elements design using different CADs.
Extension of the operating band of printed emitters using distributed excitation
Authors: Voskresenskiy Dmitriy , Ovchinnikova Elena , To Nguen Dinh , Van Vinh Pham , Khaung Ye Htut
Published: November 2019

Models of printed emitters are developed. The possibility of expanding the operating band with the help of spikes is displayed. The directional and frequency characteristics of printed emitters are determined.
Modeling of multicomponent diffraction structures based on optimization approaches and numerical methods
Authors: Lvovich Igor , Lvovich Yakov , Preobrazhenskiy Andrey , Choporov Oleg
Published: November 2019

The paper proposes a methodological approach in which the representation of objects in the form of a set of diffraction structures is their Association into groups. Using neural network modeling, expert evaluation and application of optimization based on genetic algorithm, there is a formation of the object with the desired scattering properties. An example of modeling an object presented as a set of two-dimensional cylinders is given.
Parameter optimization for the three-frequency feed for the mirror antenna of the non-linear radar
Authors: Slyozkin Vitaly , Nevedrov Mikhail
Published: November 2019

Analyzed below is a radiating structure represented by a flat self-complementary three-sector structure fed by three segments of the microstrip line and located above the stepped metal screen, and to be used as an exciter for the non-linear radar antenna. When proper matching with the feeding coaxial cable is achieved, results of the numerical simulation proved that the antenna can provide near-circular polarization of radiation at the probing signal frequency, and linear polarization at the second and third harmonics of this signal.
Development of transformable reflectors of mirror space antennas
Authors: Reznik Sergey , Prosuntsov Pavel , Denisov Oleg , Denisova Liliana , Zavaryev Vladimir , Mikhailovsky Konstantin
Published: November 2019

Currently, the task of designing large structures of space antennas is becoming increasingly important due to active research and development in the area of creating remote sensing and communication satellites. Designing such structures is a complicated task due to geometric features, a large number of joints, compactness requirements, as well as operating conditions of the outer space. These factors require special methods for assessing the workability of these structures. This paper presents the results of simulation and experimental studies aimed at creating transformable antenna reflectors. The results of choosing general structural layouts are considered. It is noted that the main reason for the reflector shape distortion is non-uniform heating by the solar radiation and radiation fluxes coming from the Earth. The paper presents the results of numerical modeling of temperature and stress-strain state of transformable antenna reflectors from metallic mesh sheet meeting the requirements for operating on the geostationary orbit.
Diffraction mode selection in planar lasers with Bragg resonators
Authors: Ginzburg Naum , Sergeev Alexander , Kocharovskaya Ekaterina , Malkin Andrey , Egorova Ekaterina , Zaslavsky Vladislav
Published: November 2019

Using the coupled-wave approach supplemented by the quasioptical approximation, we investigate the possibilities of diffraction mode selection with respect to the transverse index in planar distributed-feedback lasers. Quality factors and spatial structures of planar Bragg resonators with finite width and length of the corrugate area were found. Allowable values of the Fresnel parameter were determined at which the diffraction losses at the resonator edges lead to effective discrimination of modes with large numbers of transverse variations and thus provide conditions for the onset of a stationary single-mode laser generation regime.
Electromagnetic eigenmodes of spherical thin films
Authors: Kharlanov Alexander V.
Published: November 2019

Eigenmodes of the spherical and ellipsoidal dielectric thin films have been analyzed. The results of calculations of frequencies of natural electromagnetic oscillations of spherical thin films depending on their sizes and dielectric permeability of external environment are presented.
Integro-differential equations of magnetostatics for calculation of nonlinear inductances in low-pass filters
Authors: Kornev Igor , Shapovallov Alexander
Published: November 2019

In this work on the basis of the obtained integral relations, including integral equations, taking into account the influence of magnetic screens from a nonlinear magnetic on the inductance of multilayer coils in dependence of the current strength, the frequency and nonlinear properties of inductances of noise suppression radio reactors of electric transport are obtained. The radio reactors properties behavior in the circuit under nonstationary effects is studied.
Magnetopiezofiber
Authors: Ivanov Sergey , Semenov Gennady , Kovalenko Denis
Published: November 2019

The results of the magnetoelectric effect study in the magnetopiezofiber are presented. Magnetopiezofiber consists of mechanically coupled piezoelectric (one layer of lead zirconate titanate) and magnetostrictive (two metglass layers) fibers. The layers were joined together by epoxy under pressure and heating. The sample active area dimensions were 28x7x0,34 mm. The study of the magnetoelectric effect was carried out in the frequency range from 0 to 150 kHz and external magnetic field range from 0 to 100 Oe. Maximum value of the ME voltage coefficient αE = 62,75 V/cm-Oe was measured on the electromechanical resonance frequency f = 61 kHz with an external magnetic field of 4,5 Oe. Obtained results indicate the prospects of the proposed design in magnetoelectric devices application.
Quantum mechanical state of the quantum system, and tunneling effect (a new approach)
Authors: Torkhov Nikolay
Published: November 2019

A physical model proposed in this paper resolves existing contradictions between wave and corpuscle properties of quantum particles (electrons) in tunneling effect. By means of AFM methods the work shows that the existence of the second electron on the other side of potential barrier is necessary to realize a tunneling effect in a probe-surface system. At this, only quantum mechanical state of the electron — not its corpuscular properties — described by the wave function tunnels (penetrates) through the potential barrier. The presence of the second electron on the other side of the potential barrier is necessary to establish concatenation with the first, so to say, ‘tunneling’ one. At lack of the second electron on the other side of the potential barrier, only tunneling quantum mechanical state of the first electron is possible — without transferring its corpuscular properties.
Peculiar properties of the electron beam dynamics simulation by particle-particle methods taking into account delay effects
Authors: Alikov Sergey , Shein Alexandr
Published: November 2019

An analysis of the plane influence separating the interaction space from the electron beam-forming region is made by the particle-particle simulation method with the delay effect. During the simulation, it was shown that the boundary conditions on the surface have a significant effect on the electron beam dynamics in a longitudinal magnetic field and affect the time of formation of the virtual cathode and the particle velocity in the interaction space.
Estimation of the microwave load parameters' measurement error, caused by imperfection of the probe, used for study of the electromagnetic wave’s phase distribution in the transmission line
Authors: Gimpilevich Yu.B. , Zebek S.E.
Published: November 2019

The study concerns the influence of a non-ideal probe on a measurement error of the complex parameters of microwave nodes in the implementation of the quadrature measurement method based on the analysis of the electromagnetic wave’s phase distribution in the transmission line. A mathematical model of the quadrature measurement method has been developed using an imperfect probe, and relations have been obtained that allow one to calculate measurement errors. A program for error modelling and calculating was developed and multiple numerical studies were performed using this program. It is shown that for practically important cases, the relative error in the measurement of the module does not exceed 0.5%, and the absolute error of the argument does not exceed 2 degrees.
Radiofrequency method for measurement of liquefied petroleum gas mass in the tank of a gas tank truck
Authors: Sovlukov Alexander , Tereshin Victor
Published: November 2019

Radiofrequency method for measurement of liquefied petroleum gas mass under overload from gas tank trucks into tanks of automotive gas-filling stations and gas-holders is considered. Experience of application of radiofrequency measurement system SU-5D-MASS for mass measurement of various liquids and gas condensates under their storage in reservoirs and pumping through pipelines is taken into account. Optimization of measurement system is suggested implying equipment of 1–2 gas tank-cars by Coriolis flow-meters and radiofrequency sensor of liquefied petroleum gas mass in the tank of a gas tank-car while other gas tank-cars are equipped only such a mass sensor. New approach of calibration of tanks of gas tank trucks and automotive gas-filling stations is suggested.
Simulation of the thermal state of the workpiece made of polymer-matrix composites using microwave radiation
Authors: Prosuntsov Pavel , Reznik Sergey , Polsky Pavel
Published: November 2019

The simulation results of the thermal state of a cylindrical workpiece made of composite material and exposed to the action of microwave radiation are presented. The mathematical model of a workpiece allows the analysis of the interconnected thermal and electromagnetic processes in the equipment operating area, and also takes into account the exothermic effect associated with the curing of the polymer matrix.
Features of the microwave fields' influence on cereals
Authors: Poletaev Dmitrii , Shadrin Anatoliy , Nudga Alexander , Sokolenko Bohdan , Chmeleva Svetlana , Shabanova Yulia
Published: November 2019

In this paper we describe a study of microwave fields, influence on cereals. A change in the energy of germination and germination was noted. Descriptions of the methods of the experiments are presented. Methods for determining the wavelength of microwave radiation for irradiating cereal crops are proposed. Also hypothesized about the causes of the change in energy of germination and germination of cereals under the influence of the microwave field.
Polygon “Simeiz-Katsively” - the cycles in the climatic and the geophysical characteristics of the Crimea
Authors: Volvach Alexander , Kurbasova Galina , Dmytrotsa Andrej , Neyachenko Dmitry
Published: November 2019

Coherent variations are established with periods of about 10–12 years and 60–70 years, which are found in processes of different physical nature and can be attributed to global cycles in the solar system, the manifestation of which in climatic and geophysical local processes is the result of a general tendency to synchronize. Coherent variations with multiple or comparable frequencies are possible in this process. Analysis of climatic characteristics on the Crimean peninsula for the period 1983 - 2005 revealed an accelerated increase (in comparison with other points of the Crimea) with the insolation of the earth's surface in Kara -Dag and an abnormal decrease in the temperature of the Earth’s surface at Lantern
Electrodynamic model of relict radiation scattering by vegetation cover to improve the accuracy of soil moisture measurement by microwave radiometer
Authors: Chigikov Sergey , Gorbachev Dmitri , Taradin Alexey , Sidorova Maria
Published: November 2019

The possibilities of electrodynamic model of relict radiation scattering by vegetation cover to improve the accuracy of soil characteristics measurement by microwave radiometer are demonstrated. The dependence of the reflective characteristics of the soil-vegetation system on the type and parameters of vegetation cover is considered. The accuracy of measuring the radio brightness temperature of the soil is estimated depending on the type and characteristics of the vegetation cover.
A review of joint signal processing in ground multiradar system on experimental data
Authors: Rymov Aleksey I. , Savelyev Aleksey N. , Semenov Aleksandr N.
Published: November 2019

The dependence of the quality of the radar image according to the results of joint processing on the alignment of the dynamic range of the radar information from different radar sensors is shown. A simplified procedure is proposed for calibrating radar information for joint processing. Conclusions are made about the potential resolution of a multiradar system.
Immunity of coherent stroboscopic processing system of ultra wideband signals during synchronous mode
Authors: Pak Oleg , Zakharchenko Vladimir
Published: November 2019

Analyze of the radio pulse stroboscopic schema work in “synchronous” mode was made at clock interval synchronization by the second harmonic of intermediate frequency. It’s introduced relationships describing the input radio signal’s amplitude relationship during the phase modulation transforming in time during work the converter in synchronous mode. The results of semi natural modeling of the radio pulse gating system qualitative agreement with theoretical calculations.
Onboard equipment of L- and X-bands synthesized aperture radars for remote sensing of the Earth with higher resolution: requirements and implementation
Authors: Rovkin Mikhail
Published: November 2019

Requirements to the equipment of dual (L - and X-) band SAR, realizing increase of spatial resolution due to expansion of a spectrum of sounding signals are set. The technical decision of the main components of the onboard equipment and the results of bench tests of the layout of small - sized SAR of L - and X-bands for remote sensing of the Earth prepared for flight tests are described.
The struggle for the range of telephone communication before the invention of the audion Lee de Forest
Authors: Pestrikov Victor M. , Yermolov Pavel P.
Published: November 2019

The increase in the range of laying telephone lines at the beginning of the 20th century raised the issue of high-quality telephone signal transmission for scientists and engineers. The innovative technology for solving the problem was based on the “Heaviside condition”. AT&T engineer George Campbell, who received a patent for the design of load coils, was engaged in this task. He demonstrated that a telephone line loaded with coils can transmit clear voice signals twice as far as unloaded telephone lines. At about the same time, Columbia University professor Michael Pupin dealt with this problem, who also received a patent for a similar concept in priority over Campbell's application. As a result, load coils became known as “Pupin coils”. Ironically, Campbell lost the patent priority battle. The proposed innovation eliminated time delays and distortions in the signal, thereby significantly increasing the transmission speed.
Effect of crystallographic texture on the forming limit in microforming of brass
Authors: Mashalkar Anil , Nandedkar Vilas
Published: November 2019

Microforming is an emerging technology to manufacture products in the light of miniaturization in several domains of industry. Plastic anisotropy is one of the material characteristics significantly affecting the micro forming process. The crystal orientation influences tensile strength, yield strength and ductility, depending on different grain sizes and principle sliding planes. The present work elaborates on the influence of the plastic anisotropic in microforming for a plane stress state condition. Yield function and constitutive equations for the anisotropic material with consideration of the crystal lattice constants and parameters of crystallography texture are proposed. The crystal orientation is considered in a subroutine VUMAT algorithm, as an internal variable based on the developed mathematical model which is implemented in Abaqus as an user material subroutine. Micro limiting dome height experimental tests for different strain paths are conducted with brass foils. The results are compared with that predicted with numerical analysis, considering critical damage and element deletions. The numerical and experimental results show a good agreement for the Alpha brass ultra-thin foils, using a set of failure criterion.
Keine rosigen Zeiten …
Authors: Albrecht Andrea
Published: November 2019

Nach erfolglosen Verhandlungen zwischen Krankenkassen und DKG zum Thema Pflegepersonaluntergrenzen hat BGM Jens Spahn (CDU) nun erneut Vorgaben für insgesamt acht pflegesensitive Krankenhausbereiche vorgelegt. Diese gelten ab dem 1. Januar 2020. Im Interview die Einschätzung einer Expertin.
Glukosemessung
Authors: Schnellbächer Elisabeth
Published: November 2019

Fünf Jahre nach der Erstauflage des „Leitfaden zur Blutglukose-Selbstkontrolle in Beratung und Therapie“ durch den Verband der Diabetes-Beratungs- und Schulungsberufe e. V. (VDBD e. V.) ist die aktualisierte Fassung im Mai 2019 erschienen. Sie trägt den Titel: „Leitfaden zur Glukose-Selbstkontrolle in Beratung und Therapie“. Im ersten Leitfaden wurde ausschließlich die Selbstmessung der Blutglukose (self monitoring of blood glucose; SMBG) durch Betroffene und deren Angehörige thematisiert. Adressaten des Leitfadens waren Health Care Professionals, die in ihrer täglichen Beratungspraxis unterstützt werden sollten.
Sekundäre Neuroprotektion beim Glaukom durch Augendrucksenkung
Authors: Unterlauft Jan Darius
Published: November 2019

Das bisherige zentrale Ziel der Glaukombehandlung liegt darin, den intraokularen Druck (IOD) auf medikamentösem und/oder chirurgischem Weg zu senken, um ein weiteres Voranschreiten der Erkrankung über einen möglichst langen Zeitraum hin suffizient zu verhindern. Eine Stabilisierung des Gesichtsfeldes und des Nervenfasersaums der Papille wurden bisher als bestenfalls zu erreichende Ziele der Therapie des Glaukoms angesehen. Mittels einer systematischen Literaturrecherche und Analyse der bisher zum Thema Neuroprotektion und funktionelle Verbesserung durch Augendrucksenkung bei Glaukom veröffentlichten Untersuchungen sollen die bisher beschriebenen Möglichkeiten der anatomischen und funktionellen Wiederherstellung von vormals verloren gegangenen Strukturen und Funktionen beleuchtet werden. Im Rahmen verschiedener, teils groß angelegter Studien konnten bereits Hinweise für eine anatomische Befundverbesserung am Sehnervenkopf und funktionelle Verbesserungen in den Ergebnissen der Perimetrie gefunden werden. Anatomische sowie funktionelle Befundverbesserungen bei der Behandlung des Glaukoms scheinen in einigen Fällen tatsächlich vorzuliegen. Allerdings finden sich solche Befunde häufig in solchen Fällen, in denen der IOD sehr stark im Vergleich zum Ausgangsbefund gesenkt wurde.
Evaluation of Different Types of Natural Surfactants by Lung Ultrasound in Respiratory Distress Syndrome
Authors: Bozkaya Davut , Dizdar Evrim Alyamaç , Korkut Sabriye , Ceran Burak , Alkan Mihriban , Oğuz Şerife Suna
Published: November 2019

Objective This study aimed to compare the lung ultrasonography (LUS) scores after two different natural surfactant administration as a parameter reflecting lung inflation.

Study Design Preterm infants of 32 gestational weeks and below who were diagnosed with respiratory distress syndrome (RDS) were randomly assigned to be administered either poractant alfa or beractant, prospectively. Serial LUS scans were obtained by an experienced neonatologist in a standardized manner before and after (2 and 6 hours) surfactant administration. The LUS scans were evaluated by protocols based on scores and lung profiles.

Results Thirty-seven infants received poractant alfa and 36 received beractant. The baseline characteristics and presurfactant LUS scores were similar in groups. The scores were significantly decreased after surfactant administration in both groups (2 hours, p = < 0.001; 6 hours, p = < 0.001). LUS scores in poractant group were significantly lower than beractant group when compared at each time point. At the end of 6 hours, the number of infants with the normal profile was significantly higher in the poractant group (∼65%) than the beractant group (22%).

Conclusion LUS is beneficial for evaluating lung aeration after surfactant treatment in preterm infants with RDS. A better lung aeration can be achieved in the early period with the use of poractant alfa.