Discussion on the issues of applying OTN in power grid communications by Xinnan CHEN, Weihua LIAN, Yining MA

“…With the gradual increase in the demand for communication bandwidth in the electric power grid, the application of optical transport network (OTN) in electric power communication has become increasingly extensive and in-depth.A series of problems to be solved have been found in the application process.The long-haul transmission problem, the interruption problem of OTN with polarization multiplexing carried by OPGW which is caused by lightning strikes, the problem of mismatch between trend of service requirement development and functions combination of OTN equipment.The background and principles of the above three issues were briefly sorted out and introduced.The forward and backward Raman amplifiers and remote optical pumping amplifiers were applied in the practical OTN system construction project.Theoretical calculations of the optical power distribution along the fiber were carried out and verified by field measured data, which quantitatively proved the gain of amplifiers mentioned above on the single-span transmission distance of OTN systems.The speed of the rotation of SOP caused by natural lightning strikes was theoretically estimated and measured in the practical OTN system.A test method for the SOP tracking ability of the OTN systems was proposed and carried out.An idea of applying the pakect optical transport network (POTN) to imporve the flexibility of OTN bandwidth administration was proposed.…”
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STUDY ON MESHING CHARACTERISTICS AND FATIGUE LIFE OF CYCLOIDAL SPUR GEARS WITH LOW SLIDING RATE by XU JianMin, ZHENG QingJie, LIU Kun, GONG XiaoYan, SONG Lei

“…In order to improve the transmission performance of gears,a low sliding rate cycloidal spur gear based on the meshing line principle was presented.Firstly,the equations of gear sub tooth profile and transition curve were derived from the gear meshing principle.Then,the maximum degree of overlap was calculated as 3.0134 based on the gear meshing principle and the overlap equation.Finally,computer simulation was conducted to analyze the stability,contact stress and fatigue life during the meshing process.The results show that the tangential meshing force between the teeth of the high overlap cycloidal gear is 1238.2 N,which is 5.24%smaller than that of the involute standard gear under the same working condition.The fatigue life analysis shows that the minimum fatigue life is 4.534×106times,and the tooth surface contact stress is mainly concentrated in the gear meshing position and the tooth root part,so the fatigue damage is easy to occur in the driving gear and driven gear meshing and tooth root part.…”
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A reduced-complexity compressed sensing channel estimation for underwater acoustic channel by Xuan YU, Xuan GENG

“…Aiming at the sparse characteristics of underwater acoustic channels for shallow seas, a reduced-complexity look-ahead backtracking orthogonal matching pursuit (RC-LABOMP) channel estimation algorithm was proposed.Firstly, two types of support sets of orthogonal matching pursuit and subspace pursuit channel estimation algorithms were calculated, and then prior information based on the intersection and union of the two support sets were preprocessed.At last, the preprocessed prior information was used to complete look-ahead backtracking orthogonal matching pursuit channel estimation.The preprocessed prior information leads to the decrease of the iteration number of original LABOMP, and reduction of the atom index range, thus the proposed algorithm can reduce the computational complexity of original LABOMP significantly.In addition, combining the proposed algorithm with the underwater acoustic Turbo equalization system is more suitable for underwater acoustic communication systems.Simulation results show that the proposed algorithm demonstrates high estimation accuracy and low bit error rate performance under both conditions of random channels and underwater acoustic channels.It also reduces the computational complexity of the LABOMP algorithm.Therefore, it is an effective method for shallow seas underwater acoustic channels estimation algorithm.…”
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High-cycle notch sensitivity of alloy steel ASTM A743 CA6NM used in hydrogenator turbine components by José Alexander Araújo, Jorge Luiz de Almeida Ferreira, Braitner Lobato da Silva

“…The specimens were tested under uniaxial fatigue loading with a load ratio equal to -1, and the considered stress concentration factors, Kt, values, calculated with respect to net area, were 1.55, 2.04 and 2.42. …”
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Current Status of Norovirus Infections in Children in Sub-Saharan Africa by Samuel Munalula Munjita

“…These statistics were calculated from studies carried out in 12 out of 48 Sub-Saharan African countries. …”
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Effect of Loading Rates on Mechanical Characteristics and Rock Burst Tendency of Coal-Rock Combined Samples by Jiang Hu, Jingang Li

“…And, the rock burst tendency was also calculated by the Rock Burst Energy Index KE. The results show that with the increase of the loading rate, the total input energy, elastic strain energy, and dissipation energy all show an increasing trend. …”
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Perception of uncertainty concerning illness and coping styles among parents of children with central nervous system tumors: a correlation analysis by Bai Lan, Zhao Qinqin, Li Ying, Zhou Zhihuan

“…Information about these children and their parents were analyzed using the modified Parents' Perception of Uncertainty in Illness Scale (PPUS) and the Coping Health Inventory for Parents to calculate correlations of parents' perceptions of uncertainty concerning illness and coping styles.ResultsThe total score of PPUS was 45.28 ± 8.428 for the parents of children. …”
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Design of A Novel Robot with Omni-directional Mobile and Obstacle-crossing Function by 臧红彬, 许雄, 周颖玥, 陶俊杰, 蔡勇, 赵登峰, 沈连婠

“…Then six typical layouts of four Mecanum wheels are illustrated and the optimal layout is picked out by calculating the Jacobian matrix rank of the six typical layouts. …”
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Interactive Multimodal Television Media Adaptive Visual Communication Based on Clustering Algorithm by Huayuan Yang, Xin Zhang

“…The method divides the similarity calculation in the clustering algorithm to improve the clustering efficiency of the algorithm. …”
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Study on Flood Season Staging in Longtan Reservoir Based on Fisher Optimal Dissection Method by LI Dongqin, HUANG Ya, YI Ling, HOU Guibing, LI Yuanyuan

“…Based on the daily data of precipitation and runoff over the Longtan reservoir from 1960 to 2015,this paper selects four weight assignment methods to calculate the feature vector of flood season stages based on Fisher optimal dissection method,and analyzes the number of optimal flood season stages of the reservoir.The results show that:When ten days are used as the unit of flood season staging,the weight coefficients have little influence on the result of flood season staging.The flood season staging results of the Longtan reservoir based on the Fisher optimal dissection method can better reflect the characteristics of rainstorms and flood in the flood season of the basin,and the optimal number of flood season stages is five.According to the optimal staging results,the flood season in the Longtan reservoir is divided into pre-flood transition period (April 1~April 30),pre-flood period (May 1~May 20),main flood period (May 21~July 20),post-flood period (July 21~September 10) and post-flood transition period (September 11~October 31).…”
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A Multicomponent Magnetic Proxy for Solar Activity by Harry P. Warren, Linton E. Floyd, Lisa A. Upton

“…To compute this proxy we project Carrington maps, such as the synchronic Carrington maps computed with the Advective Flux Transport (AFT) surface flux transport model, to heliographic cartesian coordinates and determine the total unsigned flux as a function of absolute magnetic flux density. Performing this calculation for each day produces an array of time series, one for each flux density interval. …”
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Correlation coefficients of vibration signals and machine learning algorithm for structural damage assessment in beams under moving load by Toan Pham-Bao, Vien Le-Ngoc

“…Take measurements from different locations and calculate correlation coefficients between them, then use these as features to evaluate the structure. …”
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Improvement of Bayesian Water Supply Network Evaluation Model Based on Triangular Fuzzy Number and Its Application by SHI Xiaolin, DING Xiangyi, LIU Siran, LING Minhua

“…In view of the shortcomings of the single weight determination method and the uncertainty of the pipeline health level determination method in the Bayesian water supply network evaluation model based on triangular fuzzy number, this paper improves it by the coefficient of variation method and the fuzzy analytic hierarchy process (FAHP) to calculate the comprehensive weight, thus determine the pipeline health level based on the overall score, and applies the improved model to the health status assessment of the water supply network in Yunhe County, Zhejiang Province.The results show that: for health grades, 53% of the pipelinesare in class I, 44% of the pipelines are in class II,and 3% are in class III. …”
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First D0 + D0 measurement in nucleus-nucleus collisions at SPS energies with NA61/SHINE by Merzlaya Anastasia

“…The results will be compared and discussed in the context of several model calculations including statistical and dynamical approaches.…”
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Study on the Nonlinear Characteristics of a Rotating Flexible Blade with Dovetail Interface Feature by Chaofeng Li, Zengchuang Shen, Bingfu Zhong, Bangchun Wen

“…The numerical integration method is employed to calculate the vibration reduction characteristics of the nonlinear constrained rotating blade. …”
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A method of synthetic speech spoofing detection using constant Q modulation envelope by Jia XU, Zhihua JIAN, Honghui JIN, Chao WU

“…In response to the low accuracy of synthetic speech spoofing detection based on traditional acoustic feature parameters, poor detection performance for unknown types of synthetic speech, and performance degradation in noisy environments, a method for detecting spoofing synthetic speech was proposed using constant Q modulation envelope (CQME) .The motivation of the method was from the fact that the temporal envelope of speech contained abundant information and there was a big difference in detail between the envelope of synthetic speech and genuine speech.The modulation envelope spectrum of speech was obtained by employing constant Q transform (CQT), and the root mean square of each frequency component was calculated to derive the CQME feature vector.And then the CQME feature vector was used to train the random forest classifier for discriminating genuine speech from spoofing synthetic speech.Experimental results demonstrate that the random forest trained with CQME features achieves high detection performance on the ASVspoof 2019 dataset and exhibites good detection efficacy for unknown types of synthetic speech.Furthermore, the proposed method shows high detection performance even under various noise conditions, having excellent noise robustness.…”
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Green finance as a tool to stimulate investments in environmentally sustainable projects by U. S. Karimov

“…The article also provides a   methodology for calculating the greenium that investors are willing to   pay the issuer. …”
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New strategies for probing $$B\rightarrow D^*\ell \bar{\nu }_\ell $$ B → D ∗ ℓ ν ¯ ℓ lattice and experimental data by M. Bordone, A. Jüttner

“…Abstract We present an analysis of the exclusive semileptonic decay $$B\rightarrow D^*\ell \bar{\nu }_\ell $$ B → D ∗ ℓ ν ¯ ℓ based on the Belle and Belle II data made public in 2023, combined with recent lattice-QCD calculations of the hadronic transition form factors by FNAL/MILC, HPQCD and JLQCD. …”
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The application research of ancient calligraphy recognition model based on improved filtering and AI technology in calligraphy education in colleges and universities by Xing You

“…The recognition model will filter and denoise the input image data, open and close calculation, binarization, data amplification and skeletonization. …”
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Geometric Condition of Planar Engagement and Stress Analysis of Cup Bottom of Bell Shaped Harmonic Gear by Xing Jingzhong, Pang Manyi, Chen Xiaoxia, Yao Yunpeng

“…The connection condition between the bell shaped shell and the cup bottom is solved and according to the theory of circular thin plate，the calculation method of the deformation and stress of the cup bottom is proposed. …”
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