bluuebunny/crossref_metadata_2025_split huggingface dataset:
Wiener Filtration Algorithm of an Ensemble Pulsar Timescale Based on a Power-law Model of Pulsar Power Spectrum
Authors: Yang Ting-Gao , Tong Ming-Lei , Gao Yu-Ping 
Published: August 2022

Abstract
An ensemble pulsar timescale derived from the traditional Wiener filtration still contains some high level noise. To improve this situation we developed a Wiener filtration algorithm of the ensemble pulsar timescale based on a power-law model of power spectrum for pulsars. Our algorithm has three strengths: (1) mitigating spectral leakage between frequency bins for Fourier techniques; (2) using a power-law model for power spectrum; (3) signal realization in original residuals of data set by the power-law model. According to improved algorithm we constructed an ensemble pulsar timescale EPT−TAI using timing data with respect to International Atomic Time (TAI) about 16 yr time span of ten pulsars from International Pulsar Timing Array second data release (version A). The results show that EPT−TAI detected correctly the differences TT(BIPM2015)−TAI between terrestrial time TT(BIPM2015) and TAI. Fractional frequency stability σ

z
analysis shows that EPT−TAI does not indicate red noise for 16 yr time interval, and fractional frequency stability for 8 yr and longer time intervals is slightly better than that of TT(BIPM2015)−TAI. Stability for short time intervals of TT(BIPM2015)−TAI is better than that of EPT−TAI, but TT(BIPM2015)−TAI shows red noise for longer time intervals. Using the same algorithm we also derived an ensemble pulsar timescale EPT−TT(BIPM2015) with respect to TT(BIPM2015). The fractional frequency stability curve of EPT−TT(BIPM2015) shows similar characteristics as that of EPT−TAI but with slightly lower values.
Numerical Simulation of Acoustic Scattering by a Rotating Cylinder Based on the Enhanced Optimized Scheme
Authors: Yuan Siqi , Ma Ruixuan , Wu Conghai , Zhang Shuhai 
Published: August 2022

Abstract
In this paper, we develop a new physical model which involves a Taylor vortex around a rotating cylinder. The scattering of sound waves from this new model is investigated by solving the linearized Euler equations under the polar coordinate system in the time domain. We use the enhanced optimized scheme for numerical simulations. Numerical results show that scattering causes a change in the spatial distribution of sound energy as the sound wave passes through a rotating cylinder. The directionality of the scattered field varies significantly with the length ratio of the acoustic wavelength to the radius of the rotating cylinder and the vortex intensity. The influences of the ratio and the strength on the directivities and intensities of scattered fields are analyzed. It is shown that the intensity of the scattering cross-section increases with the strength of the vortex. The pressure of the scattered sound fields has a phase shift induced by the couple scattering from the cylinder and the vortex.
Research on the Influence of Sliding Piece Gap on Dredging Performance and Installation Technology Improvement
Authors: Liu Mingming , Hu Jingzhao , Zhuang Haifei , Yang Chunlei 
Published: August 2022

Abstract
In order to ensure the gap between the sliding piece of trailing suction hopper dredger and the hull suction to meet the operation requirements, taking a 4500 m3 trailing suction hopper dredger and a 12888 m3 trailing suction hopper dredger as examples, the solid-liquid two-phase flow method was used to simulate and analyze the influence of different gap between sliding piece and the hull suction on the dredging performance. On this basis, the sliding piece installation procedure was improved and successfully applied to a 6500 m3 trailing suction hopper dredger. The results indicate that the gap has a great influence on the production. The larger the gap, the lower the production and the stronger the non-uniformity of flow field distribution; When the gap is less than 4 mm, the production reduction rate is slow, and the dredging production decreases by about 2% when the gap is 2 mm,. When the gap is more than 4 mm, the dredging production decreases linearly with the increase of the gap. The application effect of the improved sliding piece installation technology is better, and the maximum gap of the sliding piece of the 6500 m3 trailing suction hopper dredger is only 0.45 mm, which meets the needs of dredging engineering.
Study the Effect of SEN Depth on Jet Flow and Level Fluctuation under Permanent Magnet Controlling in Continuous Casting Mould by Numerical Simulation
Authors: Han Zefeng , Wang Engang , Xu Lin 
Published: August 2022

Abstract
In this paper, a new method named permanent magnet controlling mould to get majorization flow pattern and suppress fluctuation of free surface was proposed. The effect of permanent magnet controlling on the molten steel in the continuous casting process is simulated by using k-ε turbulence model. The features of permanent magnetic field and flow field inside a 1450 mm × 230 mm mould with combined permanent magnets have been calculated. The calculated results showed that the magnetic field generated by combined permanent magnets could take over both meniscus region and jet flow impingement region. Additionally, Lorentz force generated by the combined permanent magnets can effectively control the upper vortex and suppress the level fluctuation. With the SEN depth increasing, the fluctuation of free surface becomes more stable. However, the lower vortex core gets into the deeper of the slab.
Numerical Simulation of Solid-Liquid Two-Phase Flow in Non-Clog Pump
Authors: Gao Xiongfa , Wang Junhua , Lu Hongzhong , Shi Weidong , Duan Junli , Meng Wanli , Jin Jiamin 
Published: August 2022

Abstract
This paper mainly based on the CFD numerical simulation method to analyze the solid-liquid two-phase flow of the vortex pump. Three kinds of solid-phase volume concentration and three solid-phase particle diameters were given respectively to carry out the numerical simulation of solid-liquid two-phase flow in the internal flow field of the pump. The distribution of solid particles in the impeller and the lateral cavity were analyzed to study the influence of different solid-phase particle diameters and solid-phase particle concentrations on the pump performance. The results showed that there was no obvious concentration distribution at the junction area between blades and hub. The solid phase concentration on the back is lower than that on the working face. Due to the characteristics of circulating flow in the vortex pump, some particles enter the lateral cavity from the blade working face, and some particles enter the blade back face from the lateral cavity under the action of low pressure on the back and circulating flow. Solid particles are mainly distributed in the center of the cavity and are circularly distributed. The overall fluctuation of the solid phase slip velocity on the working face is not large, while the magnitude of the solid phase slip velocity on the back is relatively disordered.
Hydraulic Structure Design of Changzhou Fishway Based on Optimization Calculation of Hydrodynamic Model
Authors: Ji Rui , Li Jing , Chen Bingsen 
Published: August 2022

Abstract
The Changzhou Water Conservancy Project is the first large-scale water conservancy project above the Pearl River Estuary, and its location is extremely important. This section of the river has historically been the main channel for the migration and fattening of various fishes in the Pearl River system; in order to meet the requirements of fish in this section, protect these rare fishes and achieve sustainable development and ecological balance of biological diversity. Purpose, it was decided to build a fish building structure and fish channel in the Cheung Chau Water Conservancy Project. The Cheung Chau Fishway has a total length of 1423 m, and the water head difference between the upstream and downstream is 15 m. It is the first large-scale fishway designed in China. The water head difference of domestic fishways is generally below 5.0 m, and there is very little experience to learn from. Since there was not much successful experience in the domestic fishway at that time, and the domestic fishway construction has been out of gear for nearly 30 years, through the safety appraisal and evaluation of the Cheung Chau fishway during the operation period, valuable opinions were summarized, which will be an important reference for future projects. The experience can be used as a reference for similar projects and promotion.
Research on the Performance on Frost-Free Air Source Heat Pump with Waste Heat Desorption
Authors: Zhao Zhaorui , Yuan Hao , Gao Sen , Tian Yafen 
Published: August 2022

Abstract
For the novel frost-free air source heat pump system (FASHP), the compressor waste heat is used to assist desorption for the desiccant on the surface of the desiccant coated heat exchange (DCHE). It can promote the desorption efficiency of the DCHE in the FASHP and reduce the energy loss, which means the improvement of the stability and performance. In this paper, a DCHE model is established, and its accuracy is verified through experimental data. The model is then used to analyze the effect of working conditions and structural parameters on the adsorption rate, desorption rate, heat exchange and proportion of latent heat in the adsorption and desorption processes. The results show that the latent heat ratio is higher, the heat exchange of the DCHE is lower and the system performance is better when the temperature of the analytical circulating air increases and the velocity decreases to 25 °C/0.5 m/s. In addition, the performance is greatly affected by the fin length and width. With the increase of parameters, the heat exchange and proportion of latent heat can be increased to 115.9 J and 69.0%.
New Paper-based Microfluidic Analytical Devices for Kojic Acid Assay Based on Double-sided Adhesive Tape
Authors: Wang Jian , Hu Jing , Xiao Bo , Yang Tong , He Jingye , Yu Peng 
Published: August 2022

Abstract
Kojic acid is an antioxidant used by the cosmetics industry but the excessive usage of kojic acid may cause harm to human health. Therefore, it is important to detect the content of kojic acid in cosmetic products. In this work, the low-cost and simple paper-based analytical devices (μPADs) based on double-sided adhesive tape were developed for the colorimetric detection of kojic acid. The μPADs were fabricated by dissolving double-sided adhesive tape in toluene and then making the patterned adhesive tape penetrate into the filer paper. Ferric nitrate was used as the reagent to react with kojic acid, and the product of their chelating reaction caused the color change from colorless to orange-red. The ImageJ software was used to analyze the color intensity and the corresponding correction curve was determined. The μPADs for the detection of kojic acid exhibited a wide linear range (0.05 - 4 mM) and the detectable limit was 0.05 mM. The good selectivity and reproducibility were also demonstrated.
Discussion about the Relationship between Coating Life and Cathodic Protection Current Density of Offshore Pipeline
Authors: Li Xue , Wang Dan , Dong Changsuo , Jiang Weimin , Sun Jie 
Published: August 2022

Abstract
This article studies characteristics of 3LPE external coating material and cathodic protection technology for offshore pipeline firstly, analysis the mechanism of cathodic disbondment and specified properties, carries out cathodic disbonding tests base on different cathodic protection current density applied on coated samples at given temperature, and then analyses the relationship between coating failure life and index of cathodic protection using Arrhenius model and inverse power law model, puts forward a recommended maximal cathodic protection current density for offshore pipeline at a certain design life of coating.
Preparation and Characterization of Fluorine-free Superhydrophobic and UV-resistant Cotton Fabric
Authors: Liu Runlian , He Pingping , Xiao Zhongwei , Li Shiwei , Bi Shuguang 
Published: August 2022

Abstract
In this work, the superhydrophobic and UV-resistant cotton fabrics were fabricated via combining the nano titanium dioxide (TiO2) and silicone oil. The nano-TiO2 makes cotton fabrics possess outstanding ultraviolet (UV) resistance property, while increases the micro and nano size rough structure on the surface of cotton fabric. Then the cotton fabric was hydrophobically treated with silicone oil to make it superhydrophobic. The chemical constituents, structures, superhydrophobic and UV-resistant performance of cotton fabrics were analyzed. The cotton fabric treated with titanium dioxide and silicone oil not only showed excellent superhydrophobicity, but also displayed good UV-resistant ability. Water contact angle and UPF value can reach 161.32° and 55.17 respectively. Such multifunctional cotton fabric has broad commercial application prospects.
A Motion Control Simulation Based on Predictive Model
Authors: Li Chao , Huang Gang , Hao Zhongyang , Liu Cheng 
Published: August 2022

Abstract
How to improve target tracking efficiency, how to track targets with different motion forms, and establish target motion models are the main research directions. This paper expounds a motion control algorithm based on the prediction model. By establishing the motion equation and prediction model of the target, setting the estimated parameters, optimizing the initial value setting, and predicting the motion state of the target, the simulation analysis based on MATLAB is completed. The simulation results show that the motion control algorithm based on the prediction model has good robustness and real-time performance, realizes the feedback control closed-loop of “prediction-error-correction-prediction”, and can effectively reduce the real-time calculation amount of target tracking. Good target tracking accuracy.
Power Transformer Fault Detection Based on Improved Capsule Coverage Algorithm
Authors: Zhang Peng , Zhang Ying , Si Xinhua , Yu Zhibin 
Published: August 2022

Abstract
In the process of transformer fault detection, oil chromatographic analysis is usually used to observe the change of the dissolved gas content in the transformer oil, warn and judge the internal fault of the transformer. However, in the actual monitoring environment, there inevitably are the problems of missing data, redundancy, and uncertain dimensions. In order to solve the problem of low recognition efficiency or even incorrect recognition caused by the above problems in transformer fault detection, the idea of nuclear is introduced to the improved capsule coverage algorithm. The experimental results obtained by this improved algorithm indicate that the optimized capsule coverage algorithm can realize the accurate identification of transformer faults, it can not only improve the fault maintenance efficiency, but also ensure the transformer has a good power supply level, which is beneficial to improve the construction of national comprehensive power grid.
Research on Reservoir Operation Rules Extraction Based on Decision Tree and Its Ensemble Model
Authors: Dai Ling , Luo Guanglei 
Published: August 2022

Abstract
Reservoir operation rules, as an important tool to guide reservoir operation, are not only the decision-making reference in the period of reservoir planning and design, but also one of the key technologies affecting the comprehensive benefits of the reservoir in the stage of operation and management. Therefore, the reservoir operation rules extraction method based on decision tree and its ensemble model was proposed in this paper. The time index, early water level, inflow, outflow and current inflow were selected to form the input factor set with the reservoir scheduling principle. Comprehensively considering the characteristics of operation data and the principle of decision tree, reservoir water level at the end of period was determined as the model output and then the corresponding simulated water level evaluation index was proposed based on the reservoir regulation capacity. Furthermore, in view of the difficulties in selecting input factors and calibrating the hyperparameters of models, the F test method and mutual information were used as the correlation evaluation index of model input factors, and the Tree-structured Parzen Estimator was introduced. Finally, the proposed methods were applied in Ahai and Ertan Reservoirs, the results showed that the extracted operation rules have high precision, which demonstrated the proposed methods is practicable and effective in the reservoir operation rule extraction.
Kinematics and Dynamics Simulation of a Stewart Platform
Authors: Liang Fengchao , Tan Shuang , Zhao Xiaolin , Fan Jiankai , Lin Zhe , Shi Zhicheng , Kang Xiaojun 
Published: August 2022

Abstract
Position and orientation adjustment of the secondary mirror is one of the effective ways to improve the image quality of space camera. In order to optimize the structural design of a 6-DOF Stewart platform for secondary mirror, simulation method of kinematics and dynamics of parallel manipulator based on virtual prototyping technology was studied. Firstly, the ADAMS parametric model and inverse mathematical model are built. Secondly, theory analysis of inverse kinematics of Stewart platform was performed, and the analytical results of inverse kinematics were obtained by mathematical modeling. Thirdly, simulation of inverse kinematics run in ADAMS after the virtual prototype of parallel manipulator was established. The simulation results in ADAMS and analysis results are consistent, which proved the correctness of the virtual prototype model. Lastly, the kinematics and inverse dynamics simulation were realized by driving each strut using result of inverse kinematics. The analysis method of kinematics and dynamics of parallel manipulator provided a theoretical basis for optimizing design of a Stewart platform.
Understanding of IoT smart home environment based on the transformation of domestic interior spatial morphology: Case study of Beijing families
Authors: Yao Yanhua 
Published: August 2022

Abstract
There are two difficulties in designing a future home for urban dwellers. First is the uneven understanding between the physical built environment and everyday activities led by technological development. Second is the vague understanding between family living culture and the spatial arrangement of a dwelling. The invention of new digital technologies, such as big data, artificial intelligence (AI), and internet of things (IoT), has entirely transformed the lifestyle of urban dwellers. The gap between technology promotion in urban living environments and knowledge of living environment structures has raised the question of how smart homes could be designed in future cities. Therefore, in this paper, I examine the transformation of dwelling interior morphology for Beijing families. Five typical families are selected from 30 family samples according to the time of residence, original housing typology, family structure and occupations. The distinctiveness of family culture and spatio-temporal distribution of domestic activities could be found in the 1980s between five families, which tend to be influenced by the macro changes socially, economically, politically and technologically. The nature of IoT smart home environments and the communication between devices builds a context-awareness system based on technology. I argue that the smartness of homes could be achieved without a cultural perspective, which raises the question of design strategy for future IoT smart homes.
Tangent normalization for somatic copy-number inference in cancer genome analysis
Authors: Gao Galen F , Oh Coyin , Saksena Gordon , Deng Davy , Westlake Lindsay C , Hill Barbara A , Reich Michael , Schumacher Steven E , Berger Ashton C , Carter Scott L , Cherniack Andrew D , Meyerson Matthew , Tabak Barbara , Beroukhim Rameen , Getz Gad 
Published: August 2022

Abstract

Motivation
Somatic copy-number alterations (SCNAs) play an important role in cancer development. Systematic noise in sequencing and array data present a significant challenge to the inference of SCNAs for cancer genome analyses. As part of The Cancer Genome Atlas, the Broad Institute Genome Characterization Center developed the Tangent normalization method to generate copy-number profiles using data from single-nucleotide polymorphism (SNP) arrays and whole-exome sequencing (WES) technologies for over 10 000 pairs of tumors and matched normal samples. Here, we describe the Tangent method, which uses a unique linear combination of normal samples as a reference for each tumor sample, to subtract systematic errors that vary across samples. We also describe a modification of Tangent, called Pseudo-Tangent, which enables denoising through comparisons between tumor profiles when few normal samples are available.

Results
Tangent normalization substantially increases signal-to-noise ratios (SNRs) compared to conventional normalization methods in both SNP array and WES analyses. Tangent and Pseudo-Tangent normalizations improve the SNR by reducing noise with minimal effect on signal and exceed the contribution of other steps in the analysis such as choice of segmentation algorithm. Tangent and Pseudo-Tangent are broadly applicable and enable more accurate inference of SCNAs from DNA sequencing and array data.

Availability and implementation
Tangent is available at https://github.com/broadinstitute/tangent and as a Docker image (https://hub.docker.com/r/broadinstitute/tangent). Tangent is also the normalization method for the copy-number pipeline in Genome Analysis Toolkit 4 (GATK4).

Supplementary information
Supplementary data are available at Bioinformatics online.
The formation mechanism and homeostasis of extrachromosomal DNA
Authors: Tao Yifang , Ning Qian , Wang Zewei , Tang Nanyang , Zhao Xuhong , Tang Shengsong 
Published: August 2022

Abstract
Extrachromosomal DNA, referred to as extrachromosomal DNA (ecDNA), was found in most cancers and nearly absent in normal cells. The properties of ecDNA enable tumor cells to be more responsive to various environments. The non-Mendelian genetic mechanism of ecDNA could arouse increasing tumor heterogeneity. Besides, ecDNA would promote tumor invasiveness and provide resistance mechanisms associated with poorer survival consequences. Furthermore, ecDNA could profoundly impact oncogene activation, genome instability, tumor heterogeneity, etc. Consequently, they may offer potential possibilities for tumor diagnosis and therapeutics. We primarily reviewed the classification, several primary formation mechanisms, homeostasis maintenance and frontier progress of ecDNA and late emphasized its fundamental roles in tumorigenesis and put forward some new insights.