Spatial and Temporal Variation Characteristics of Drought in Guizhou Province Based on VCI and Division of Arid Regions by DAI Renli, ZHONG Jiusheng

“…Due to its unique dual hydrological structure of surface water and groundwater and typical karst low mountain and hilly landform area,the agricultural ecological environment of Guizhou Province is extremely fragile,and it is prone to agricultural disasters caused by meteorological factors,leading to reduced agricultural production.This paper calculates the VCI of Guizhou Province from 2001 to 2018 by remote sensing technology,explores the agricultural drought situation in Guizhou Province,divides the spatial distribution of seasonal arid regions in Guizhou Province with ArcGIS spatial overlay analysis,and analyzes the VCI trend characteristics of Guizhou Province through the unary linear trend method.The results show that:①The seasonal and inter-annual VCI in Guizhou Province generally show a downward trend,most obviously in karst areas,followed by non-karst areas;②Guizhou Province's seasonal droughts are mainly spring and winter droughts,and dry karst areas is a drought-prone area;③The drought time characteristics of Guizhou Province are mainly seasonal continuous drought and three-season continuous drought.…”
Get full text

Mining Taxi Pick-Up Hotspots Based on Grid Information Entropy Clustering Algorithm by Shuoben Bi, Ruizhuang Xu, Aili Liu, Luye Wang, Lei Wan

“…This algorithm uses a grid instead of original trajectory data to calculate and excavate taxi passenger hotspots. Through the comparison and analysis of the data of taxi loading points in Nanjing and Beijing, it is found that the experimental results are consistent with the actual urban passenger hotspots, which verifies the effectiveness of the algorithm. …”
Get full text

A New Method for Determining Optimal Regularization Parameter in Near-Field Acoustic Holography by Yue Xiao

“…The original inverse problem in calculating the source strengths is converted into a univariate optimization problem which is solved by a one-dimensional search technique. …”
Get full text

Sentiment Analysis of PeduliLindungi User Using Naïve Bayes Classifier Algorithm and Support Vector Machine by Rizki Rahmatullah, Jundi Nourfateha Elquthb, Fanya Nindha Al-Qurani, Annisa Uswatun Khasanah

“…Based on the two methods' calculations, the NBC algorithm's average classification accuracy was 83.81%, and the SVM algorithm was 93.84%. …”
Get full text

Detecting gravitational waves via coherence degradation induced by the Unruh effect by Pedro H. M. Barros, Helder A. S. Costa

“…In this background, we calculate the quantum coherence and interferometric visibility in the long-wavelength regime and large interaction time. …”
Get full text

Assessment of spatial heterogeneity of employment in Russian regions by R. I. Vasilyeva, D. M. Ampenova

“…As the main research method, the paper applies Moran’s methodology to calculate local and global spatial autocorrelation indices and Anselin’s methodology to form a spatial matrix. …”
Get full text

Characterization and Modeling Quality Analysis of Edible Oils Using Electrochemical Impedance Spectroscopy by T. A. Elmosalami, Mahmoud M. Kamel, I. Tomashchuk, Meshal Alzaid, Massaud Mostafa

“…The model built using COMSOL Multiphysics for the potential and electric field distributions for different oils and used to calculate the dielectric constant was simulated under various conditions in the AC/DC module. …”
Get full text

Study on the Mechanical Properties of Flexible Prefabricated Highway Structural Systems considering the Effect of Two-Way Fluid-Structure Interaction by Liang Huang, Wenbo Ma, Haotian Li, Shizhan Xu, Zebin Song, Yujie Hou

“…To adapt to the changes and development of the times, based on the water leakage mode of the flexibly assembled highway embankment, a new rainfall calculation model of the reinforced soil embankment is constructed and combined with the solid-fluid coupling physics theory, the sedimentation amount and slope stability of the embankment are analyzed at multiple levels, the mechanical properties of the new embankment under rainfall conditions are summarized, the factors affecting the settlement of the embankment and the stability of the slope are explored, and the reference model is provided for the construction of the new embankment, and the existing construction process is improved through multilevel cause analysis. …”
Get full text

GLOBAL ANTHRAX EPIZOOTOLOGY. 3. THE INDEX OF NIDALITY by V. V. Makarov, N. Ya. Makhamat

“…The indices of anthrax nidality, which are closest to reality and calculated using statistically reliable sample of average variants (number of outbreaks, exposed animals, mortality) for basic animal species, taken as a percentage of infected animals per one outbreak in average are 11% (from 0,6 to 19) for cattle; 4% (from 1 to 20) for small ruminants; 7% (from 6 to 33) for horses.…”
Get full text

The relationship of tax instruments and performance indicators of companies to ensure the environmental component of sustainable development in Russia by N. A. Zatsarnaya, N. I. Enatskaya

“…The correlation of   the profitability (profitability of   goods sold and profitability of   assets) and the tax burden indicators by  industries of  the Russian economy has been calculated. The results are ambiguous: it  is concluded that there is   no connection between the environmental friendliness of   the type of   activity and the interdependence between the industry indicators of   the tax burden and profitability. …”
Get full text

MECHANICAL ANALYSIS OF THE DRILL BIT IN THE DUAL CASING SIDETRACKING by KONG ChunYan, LIANG Zheng, ZHANG DeRong

“…Further reference the theory of metal cutting mechanics,researched cutting force and cutting torque of the drill bit in sidetracking the process,checked the sidetracking bit strength,provided technical advice to prevent the drill bit holded in and stuck fracture accident occurred in the dual casing sidetracking process. The analysis and calculation could provide the reference to designing the sidetracking bit and determinating construction parameters in the dual casing sidetracking process.…”
Get full text

Fault Diagnosis of Wind Turbine Gearbox based on LSGAN and VMD-MPE-KELM by Cihai Qin, Ruizhi Zhao, Yueqiang Wang, Yunfei Ding, Dong Huang, Xiaolin Lian

“…The VMD method is used to decompose the vibration signals of all kinds of faults in the sample set，and the MPE value of each modal component is calculated to extract the signal features. Then，KPCA method is used to reduce the dimension to obtain the feature vector of fault samples，which is substituted into KELM model for diagnosis. …”
Get full text

Error performance of CE-OFDM based AF systems with relay selection by Tao JIANG, Guangqiu LI, Jianhui CAI

“…Constant envelope (CE) orthogonal frequency division multiplexing (OFDM) can develop the advantages of OFDM,and eliminate the shortcomings of high peak-to-average power ratio (PAPR) and sensitivity to non-linear distortion of power amplifiers.The error performance of OFDM based amplify-and-forward (AF) cooperative system with relay selection will be deteriorated due to feedback delay and other factors.Minimum mean square error (MMSE) Wiener channel predictor can alleviate the deterioration of error performance of wireless systems caused by feedback delay.For this reason,the CE-OFDM based AF cooperative system with relay selection and MMSE channel prediction which can overcome the shortcomings of OFDM and the influence of feedback delay was proposed,and its lower bound expressions for the average bit error rate (ABER) of rectangular quadrature amplitude modulation over Rayleigh block fading channels were derived.The numerical calculation and simulation results show that the lower bound expressions for the ABER of the above system has high accuracy when the modulation coefficients are small and can be used to design the AF cooperative system with CE-OFDM,channel prediction,and relay selection.…”
Get full text

An Integrated Methodology for Supplier Selection under the Presence of Vagueness: A Case in Banking Sector, Turkey by Semih Onut, Suleyman Tosun

“…In the first phase, matrices used to define the importance of the supplier selection criteria and the technical requirements are calculated with the fuzzy ANP method. The technical requirements and the criteria are combined in the house of quality to evaluate the relationship between them. …”
Get full text

QSAR Study of the Biologically Active Organosulfurs in Natural Products by Fakhr M. Abu-Awwad

“…The semiempirical AM1 in Gaussian 2003 for windows was used to optimize the structures whereas a subsequent calculation of hundreds of various types of descriptors at the density functional (B3LYP/6-31G*) using CODESSA package was employed. …”
Get full text

Interference mitigation for satellite-terrestrial heterogeneous coexistence cognitive MIMO system based on DBF by Yong LIAO, Tao WANG, Huan CHEN, Xin ZHOU, Yu-feng LI

“…For the coexistence and increasing interference of satellite-terrestrial network and terrestrial wireless network,a typical scenario where the geostationary earth orbit (GEO) satellite-terrestrial network and the 4G mobile communication network coexist heterogeneously was analyzed.Besides,a multi-user cognitive system model that secondary satellite terminals interfere the primary multiple input multiple output (MIMO) 4G based stations was also proposed,with whose general signal processing was deduced.Meanwhile,digital beam forming (DBF) technology in 4G based station system was adopted to minimize the cognitive interference caused by multi-antennas and multi-users.And an optimal beam weight based on fixed azimuth interference (OBW-FAI) was proposed.Weight vector was only related to the azimuth of the interferences,thus the proposed algorithm does not need real-time and repeat calculations,and had small complexity.Finally,the numerical simulation results verify that the proposed system and algorithm can effectively reduce interference between satellite-terrestrial network and terrestrial wireless network to a certain extent.…”
Get full text

Experimental and Numerical Study of At-Rest Lateral Earth Pressure of Overconsolidated Sand by Magdi El-Emam

“…Results indicated that the measured horizontal earth force is about three times the value calculated by classical at-rest earth pressure theory. …”
Get full text

UNIFIED CORRELATION OF GEOMETRY CONSTRAINT WITH FRACTURE TOUGHNESS FOR THE INTERFACE CRACK IN BIMETALLIC JOINTS by YANG Jie, WANG GuoZhen, WANG YiHao

“…And the equivalent plastic strain distributions ahead of crack tips for specimens with different constraint were calculated by the FEM model. After the fracture toughness JICand Apunder different constraint conditions were obtained,the unified correlation of in-plane constraint and out-of-plane constraint with fracture toughness of bimetallic joint was investigated. …”
Get full text

Underwater Acoustic Image Encoding Based on Interest Region and Correlation Coefficient by Liu Lixin, Guo Feng, Wu Jinqiu

“…This paper applies the classification, reduction codebook, and correlation coefficient matching strategy to narrow the search range of the range block in order to solve the problem of the long encoding time and the calculation amount of encoding process is greatly reduced. …”
Get full text

Risk Assessment Method for Offshore Structure Based on Global Sensitivity Analysis by Zou Tao, Li Huajun, Liu Defu

“…The maximum structural stress and deformation of a Jacket platform are analyzed and compared with different design standards. The calculation result sufficiently demonstrates the new risk assessment method’s rationality and security.…”
Get full text