bluuebunny/crossref_metadata_2025_split huggingface dataset:
Multiple Photon Sampling Technique Based on Stochastic Progressive Photon Mapping
Authors: Yang Liyan , Kang Chunmeng 
Published: May 2020

Abstract
This paper introduces a multiple photon sampling technique based on stochastic progressive photon mapping. We use the image space concept to divide the scene into continuous sub-blocks and then we calculate our proposed distance function and photon number function in each of the sub-blocks. The distance function is used to calculate the distance error of the hit point and to determine whether each sub-block is located at a boundary between different objects. The photon number function is used to calculate the photon number error and to determine whether the photon distribution in each sub-block is uniform. Based on the values of the distance error and the photon number error, the multiple photon sampling technique is used to acquire multiple samples of the hit point in each sub-block. Instead of using a single radius for the radiance estimate, we use three different radii and compute the final radiance estimate as a weighted average of the three values. When compared with the existing stochastic progressive photon mapping method, our method provides a better solution to the photon distribution problem and can also reduce bias and noise, especially in the scene with drastic changes in light and dark.
Analysis and Modeling of UAV Near-ground Communication Channel
Authors: Hao-qi Bi , Xin Xiang , Na Li 
Published: May 2020

Abstract
UAV communication platform has become a reliable solution to meet the needs of users in some unexpected situations. In this paper, the statistical method of small area modeling is used to model the UAV near-ground communication channel. The channel is abstracted into three factors: time-delay power spectrum, Doppler power spectrum and Rice factor. As a result, a new method of channel delay generation is introduced, and the time-varying Doppler frequency gain factor is adopted. The simulation results show that the UAV near-ground communication channel is a Rice channel whose amplitude obeys Rayleigh distribution and phase obeys uniform distribution. The bit-error-rate of UAV near-ground communication channel is much higher than that of AWGN channel. At the same time, the constellation chart also shows that the signal passing through the UAV near-ground communication channel will cause strong inter-symbol crosstalk.
An Oscillation Energy Calculation Method Suitable for the Disturbance Source Location of Generator Control Systems
Authors: Guo Siyuan , Zhang Shoushou , Li Li , Song Junying , Zhao Yongsheng 
Published: May 2020

Abstract
Low frequency power oscillation threatens the secure and stable operation of power systems. Since the appearance of low frequency oscillation there are lots of approaches to analyze this problem. The oscillation source location method based on oscillation energy is adopted to find the cause of the oscillation, and to locate the oscillation source. Forced power oscillation is a kind of low frequency oscillation based on resonance mechanism, and the key is to quickly locate and remove the disturbance source. Aiming at the shortcomings of the existing disturbance source location methods, an oscillation energy calculation method suitable for the generator control systems level location is proposed. With the rich acquisition of generator data by means of phasor measurement unit (PMU), this method has the advantage of not relying on generator parameters. Taking the forced power oscillation caused by the abnormality of the governor system as an example, the superiority of the method is verified.
A possible approach to the identification of inertial parameters of large-sized space debris using a specialized nanosatellite
Authors: Lomaka I.A. 
Published: May 2020

Abstract
The paper substantiates the possibility of space debris parameters estimation using a specialized nanosatellite. It is proposed that the nanosatellite is deployed from the main spacecraft and then attached to the space debris object (the attachment method is not considered in the work) and, using on-board measuring instruments, determines dynamic and inertial characteristics, thereby fulfilling the role of a remote measuring instrument. This approach was called the contact method. Such approach has an advantage over non-contact ones, as it allows to get rid of the problems associated with the use of optical or infrared cameras, planning photographs. In addition, with the help of a nanosatellite, the problem of establishing a physical connection between a towing vehicle and space debris can also be solved. To show the solution of this problem, the second stage of the Cosmos 3M launch vehicle was used as an example
Testing of the sensing element of a capacitive micromechanical accelerometer
Authors: Styazhkina A.V. , Belogurov A.A. , Sharagina N.S. , Belyev Ya.V. , Moiseev N.V. 
Published: May 2020

Abstract
Sensing element is one of the main parts of a micromechanical accelerometer. It determines a lot of parameters of the whole device. Its design flow is a complex process including the steps from the analysis of technical and technological requirements to testing the manufactured devices. Testing is one of the most important steps because it allows not only getting the final characteristics of the chip, but also verifying and specifying the mathematical model of the sensing element for future designs. The paper presents the results of micromechanical accelerometer sensing element testing. Special attention is given to the steps of wafer-level testing and testing with an integrated circuit in the accelerometer.
State-feedback anisotropy-based robust control of linear systems with polytopic uncertainties
Authors: Belov A.A. 
Published: May 2020

Abstract
In this paper, linear discrete-time systems with polytopic uncertainties affected by random external disturbances are under consideration. The input disturbance is supposed to be a stochastic signal with known mean anisotropy, which stands for a spectral color of the signal. The anisotropic norm of the system indicates its stochastic gain from the input disturbance with the same mean anisotropy level to the output of the system. The problem is to find state-feedback control law that robustly stabilizes the uncertain system and guarantees desired performance index subject to input disturbance for all possible uncertainties. In order to solve this problem, Lyapunov functions technique and matrix inequalities approach are used to obtain the numerically effective procedure. To illustrate the efficiency of the proposed conditions, a numerical example is considered.
Development of fast prototyping laser technique for production of surface acoustic wave gyroscopes
Authors: Kukaev A.S. , Safronov D. V. 
Published: May 2020

Abstract
Solid-state micromechanical gyroscopes based on surface acoustic waves (SAW) have good vibration and shock resistance because of absence of elastic suspensions, ability to work at 50 000 g loads, small dimensions, cheap in mass production, etc. Unfortunately, there are some limits for further development of such gyroscopes because it requires prototype production in small series. In this study we have investigated laser ablation method to solve this problem. Idea of this method is to evaporate unnecessary metallization from the piezoelectric crystal surface, e.g. to “draw” the electrode topology with a powerful laser beam. Main advantages of the method are as follows: possibility of fast and cheap sensors prototyping even with complicated topologies; reduction of the number of production process stages; possibility of topology correction (especially in case of transparent crystal housing); operation with thicker metal layers then traditional photolithography method, etc.
Salivary Protein Profiling of Head and Neck Cancer Patients at West Nusa Tenggara Province General Hospital: A preliminary study based on single dimension SDS-PAGE analysis
Authors: Kadriyan H , Yudhanto D , Sulaksana M A , Depamede S N 
Published: May 2020

Abstract
The initial aim of this study was to investigate the protein profiles found in the saliva of head and neck cancer (HNC) patients at the Regional General Hospital of West Nusa Tenggara Province, Indonesia. Saliva samples were collected from 21 patients with head and neck cancer (confirmed from the results of anatomical and pathology examination). Mainly the types of HNC are sinonasal and nasopharyngeal cancers. As the control, saliva samples from 10 healthy individuals were used. Each subject thoroughly rinsed their mouth with a commercial mineral water and around 2-3  mL of un-stimulated saliva was collected in a 10 mL disposable plastic container with screw cap and immediately placed on ice. Sodium azide and protease inhibitors were added into the collected saliva and then transported to the laboratory within 1 hour of sample collection and centrifuged. The supernatant was taken; the protein concentration was measured, and then lyophilized. Protein profiles were analyzed using 1D-SDS-PAGE at 12.5% running gel. The data obtained were analyzed descriptively. In this preliminary study protein bands with a molecular weight range of 35-63 kDa were observed in the saliva of HNC patients, which were not found in the saliva of healthy individuals. Whether the expression of the specific protein bands can be used as a non-invasive biomarker in patients with head and neck cancer; needs to be investigated further.
Design and Research of Intelligent Mobile Robot Based on IOT Information Fusion
Authors: Wang J J 
Published: May 2020

Abstract
Artificial intelligence-based intelligent robots are becoming more and more popular at present, and robot navigation is an instruction issued by the neural network of the robot. Therefore, a variety of sensors need to be distributed in the neural network of the robot to issue commands for the navigation of the robot., Plan the path, and perceive external information and adjust your position during the process. Therefore, the multi-sensor information fusion technology based on the Internet of Things is very important. It can provide a better information foundation for robot navigation, improve the robot navigation system and improve accuracy with the IOT information fusion technology.
Assessing effect of cotton and rice rotation on rotated cotton yield using observational data from remote sensing satellite
Authors: Sun L , Zhu Z S 
Published: May 2020

Abstract
The purpose of this paper is to study the effect of rice rotated with cotton on the yield of rotated cotton with the vegetational data or observational data from remote sensing satellite. For such rotation and yield relationship, this observational study to the remote sensing image supplies the causal inference from the cotton sample data to the cotton population. These data should be collected as a random sample. The conclusion straight away is that the differences in the vegetation indices under rotation and continuous systems were associated with raising cotton yield. That is, the yield of the cotton rotated with rice is usually greater than the yield of the continuous cotton.
Improving the environmental performance of laminated wood products
Authors: Krivorotova A I , Usoltsev O A 
Published: May 2020

Abstract
Modification of the formaldehyde resins with an extracts of softwood bark makes it possible to reduce a free formaldehyde emission from laminated wood products, in particular plywood, to increase the strength in chipping and static bending of plywood, to reduce the cost price of adhesive composition.
Green plants in environmental monitoring of the environment of the large industrial city
Authors: Avdeeva E V , Poletaikin V F 
Published: May 2020

Abstract
The urgency of the problem is determined by the unfavorable ecological situation in the large industrial centers of Siberia, formed under the influence of man-made loads that determine the modification of the environment. This leads to changes in the properties of individual biotic components and, as a result, the quality of life of the population. An important element of the natural framework of urban ecosystems and a means to improve its urban planning qualities is the system of gardening. Currently, the existing methods of creating a system of greening the city of Krasnoyarsk and other cities of Siberia, the landscape-aesthetic principles of its formation, as well as the regulatory and technical design base do not provide the comfort of the urban environment. The basis for the development of directions and principles for the reconstruction of the greening system should be the results of environmental studies of landscape processes, the identification of the main sources of environmental stress, the study of the integrated impact of man-made stressors.
Post-fire succession in scots pine forests of southern taiga central Siberia
Authors: Ivanov V A , Ivanova G A , Kovaleva N M 
Published: May 2020

Abstract
Fire is one of the main disturbance factors in the boreal forests of Russia. Forests dominated by Scots pine (Pinus sylvestris L.) are widespread in Central Siberia, with large areas burned annually. We studied post fire succession of ground vegetation following experimental fires of various intensities on typical Scots pine forest sites. The greatest changes in ground vegetation and biomass of these pine forests were after fires of high intensity. After fires of low intensity ecosystem components recovered rather quickly to pre-fire composition. These results are important for determining the effects of fire behavior and intensity on rates and patterns of post-fire vegetation recovery in southern taiga Scots pine forests of Siberia.
Simulation of forest ecosystems dynamic processes message
Authors: Ushanov S V , Shevelev S L , Kulakova N N , Vais A A , Nemitch V N 
Published: May 2020

Abstract
Dynamic characteristics of changes in the diameter of larch forests in the Lower Angara region are being analyzed. Larch stands of the herbal group of fox types is the object of the present research. This research is based on the data of field inventory 858 forest areas with larch predominance. The structure of the forest average diameter is approximated by the exponential function, statistical analysis of which has been carried out using a non-linear least-squares method and simulation methods by conducting 50000 statistical tests. Regularities of error distribution, parameters and calculation accuracy of approximating function have been defined. Estimations of parameter correlations approximating function have been suggested. Holetsky’s method helped to receive two dimensional parameter generator. The defined regularities of the dynamics of average diameters allow to design economic activities in forest stands of larch herbal groups types in the region under study.
Conditions for residents attracting of the priority territories social and economic development of closed administrative and territorial unions of the Rosatom State Corporation
Authors: Avramchikova N T , Puchkin M B , Chuvashova M N 
Published: May 2020

Abstract
The paper considers a special legal regime for conducting business and other activities in the field of taxation in order to attract residents of territories of priority socio-economic development (TPSED) of closed administrative-territorial unions (CATU) of the Rosatom State Corporation. This contributes to the accelerated development of the economy and improvement of the quality of life. The authors describe a brief feature of TPSED in terms of the interests of their potential resident and identify promising technical areas for attracting innovative small and medium companies as residents of TPSED of Rosatom State Corporation, which includes using the approaches of the circular economy in the implementation of innovative projects. The conditions that must be corresponded by representatives of small and medium businesses to obtain the status of a TPSED resident of Rosatom State Corporation. The existing criteria for the selection of residents in the TPSED of Rosatom State Corporation were considered. In addition, proposals to strengthen the motivation to attract representatives of small businesses and individual entrepreneurs as residents of TPSED are given.
Influence of Graft and Stock on the Stability of Grafted Pinus Sibirica Trees
Authors: Scherba Iu E , Matveeva R N , Butorova O F , Bratilova N P , Martynov V S 
Published: May 2020

Abstract
The growth characteristics of a 30-year-old Pinus sibirica grafted with cuttings from plus trees and a 36-year-old one of different geographical origin on the rootstock of Pinus sylvestris and Pinus sibirica, the results of their studying are presented in the article. The analysis of accretion of grafted components depending on the type, age of the rootstock was done. It has been established that 36-year-old grafted trees using cuttings of Pinus Sibirica of different geographical origin (Altai, Biryusa, Sverdlovsk, Khanty-Mansi) on the Pinus sylvestris tree differ in the growth of scion with rootstock. Ramets with good accretion (without exceeding the diameter of the stem of the scion over the stock) with maximum incompatibility (13.1 cm) were selected. The growth of 30-year-old grafted trees depends on the genotype of plus trees. The most intensive growth of ramet is noted at clone 91/55 in comparison with 100/64 and 94/58. The grafted trees of one clone (91/55) on the Pinus sylvestris had an average graft stem excess of 6.2 cm; there is practically no excess on the Pinus sibirica stock. It is recommended to use the selected specimens without sagging in the places of accretion of grafted components as uterine trees for their further reproduction and the creation of target plantations for the accelerated cultivation and use of industrial wood from Pinus sibirica.
The Cayley graphs of a centralizer of the Burnside group B
0(2,5)
Authors: Kuznetsov Alexander A , Kuznetsova Alexandra S , Kishkan Vladimir V 
Published: May 2020

Abstract
Let B
0(2, 5) = 〈a
1, a
2〉 be the largest two-generator Burnside group of exponent five. It has the order 534. We define an automorphism φ under which every generator is mapped into another generator. Let C

B
0(2,5)(φ) be the centralizer of φ in B
0(2, 5). It is known that |C

B
0(2,5)(φ)| = 517. We calculated the growth function of this group relative to the minimal generating set and also the symmetric generating set. As the results, the diameters and the average diameters of C

B
0(2,5)(φ) were computed.
Tribocorrosion behaviors of TiSiCN nanocomposite coatings deposited by high power impulse magnetron sputtering
Authors: Wang Haoqi , Ou Yixiang , Zhang Xu , Liao Bin , Ou Xuedong , Luo Jun , Pang Pan , Chen Lin , Hua Qingsong , Bao Manyu 
Published: May 2020

Abstract
High-performance coatings originated in ingenious coating designs and advanced preparation techniques are expected to fulfill imperious demands in propulsion, bearings and mechanical seals, etc in marine systems for seawater lubrication. In this work, TiSiCN nanocomposite coatings were deposited by high power impulse magnetron sputtering at a power of 4–8 kW. As power is increased, TiSiCN coatings possess nanocrystalline (TiN, TiC, TiCN)/amorphous (Si3N4, SiC, sp2-C) nanocomposite structure without distinctly preferred orientation. The highest hardness (H) of 43 GPa and effective Young’s modulus (E*) of 360 GPa were achieved at 8 kW, while the highest H/E* of 0.123 and H3/E*2 of 0.61 appear at 7 kW due to refined nano-grains, uniform distribution, high surface/interface integrity and fully dense microstructure. Rockwell C adhesion level increased from HF2 at 4 kW to HF1 at 8 kW. TiSiCN coatings with high H, H/E*, H3/E*2 and adhesion exhibit high open circuit potential of −0.07 V, low friction coefficient of 0.25 and specific wear rate of 4.78 × 10−5 mm3 N−1 m−1, resulting from mild abrasive wear without the occurrence of pitting corrosion in 3.5 wt.% NaCl aqueous solution. Moreover, cycling tribocorrosion tests revealed that passive films possess strong abilities of regeneration and self-repairation on sliding contact surface.
Phase stability and mechanical response of tantalum nitrides to electronic excitation effect
Authors: Yan Gai-Qin , Cheng Xin-Lu , Zhang Hong 
Published: May 2020

AbstractBased on an analysis ofelectronic structures and phonon spectra calculationsas a function of electronic temperature Teusing the density functional theory, we investigated the phase stability and mechanical responseto electronic excitation effect on variousphases of tantalum nitrides TaNxwith fully or partially occupied nitrogen sublattices. The results suggest that the cubic phase exhibits lattice instability at room temperature, while the hexagonal phases are dynamically stable. The phase stability increases in the sequence TaN (δ-type), TaN0.43, TaN0.5, TaN (AsNi type), TaN0.83, TaN (θ-type), and TaN (ε-type). The nonmetal vacancies exhibit enhanced latticestability with hexagonal phasescompared to the cubicphase. The electronic excitation effect providedextra stability for cubicδ-TaNwith the increase inelectronic temperature, whilethe excitation results in a lower degree of stability for hexagonal phases.The physical origin of electronic excitation effects on both the cubic and hexagonal phase stability of TaN can be attributed to the peculiarities of their electronicdensities of states near the Fermi level and a combination of three different types of bonding characteristics.The counterintuitivebehavior oflattice stabilities appears or disappears as a response to mechanical properties under electronic excitation.
Microstructure and corrosion behaviors of AZ31 alloy with an amorphous-crystallin nano-composite film
Authors: Xu Fumin , Luo Lan , Liu Yong , Wan Jun , Xu Guixing 
Published: May 2020

Abstract
Magnesium (Mg) alloy has drawn considerable attention for lightweight structural and functional materials, whereas its corrosion resistance still requires to be enhanced. A new strategy for corrosion resistance has been proposed as making an amorphous-crystalline nano-composite film on Mg alloys. The film as the composition as Al2O3/GaN with a thickness of 20 nm was prepared on AZ31 Mg alloy by atomic layer deposition. Grazing incidence x-ray diffraction, scanning electron microscopy equipped with energy-dispersive spectroscopy, transmission electron microscopy, x-ray photoelectron spectroscopy, and nano indentation tester have been used to characterize the film in details. It is verified the sample has an amorphous/crystalline/Mg interface structure, and a surface with homogeneous elemental distribution and higher hardness. Neutral salt spray test shows the film changes the corroded mode from pitting corrosion to uniform corrosion. Furthermore, electrochemical measurements indicate that the film would raise Ecorr (ΔEcorr = +0.295 V), drop icorr (about 1/10 times), and make electrical equivalent circuits change from Rs (CPE Rct (RL L)) to Rs (CRf) (CPE Rct (RL L)). All evaluations show that better corrosion resistance has been by inducing the amorphous-crystalline nano film. The amorphous layer in the film would make a more homogeneous Cl− distribution in the surface and act as a barrier to block the penetration of corrosion medium in the early stage. During corrosion, the interface between the layers in the film could retard the corrosion crack propagating further. The film would be favorate to form a denser corrosion product layer finally. A more uniform and lower corrosion occurs for AZ31 Mg alloy with this nano-composite film.