bluuebunny/crossref_metadata_2025 huggingface dataset:
Modeling the actuation of curved ionic polymer metal composites
Authors: Zhang Peng , Porfiri Maurizio
Published: January 2022

An ionic polymer metal composites (IPMC) is a soft actuator that consists of an ionomer membrane, neutralized by mobile counterions and plated by metal electrodes. Despite their early promise in robotics, medical devices, and microsystem technologies, widespread application of IPMC actuators is far from being reached. Recent advancements in additive manufacturing technologies have the potential to expand the reach of IPMCs by affording the realization of complex, design-specific geometries that were impossible to attain with standard manufacturing techniques. For this potential to be attained, it is critical to establish physically-based models that could inform 3D printing, beyond the flat, thin, non-tapered geometries that have been the object of investigation for almost three decades. Here, we bridge this gap by presenting an analytical framework to study actuation of a double-clamped IPMC arch under an applied voltage. We adopt a thermodynamically the consistent continuum model to describe the coupled electrochemo-mechanical phenomena taking place within the IPMC. We establish an analytical solution for the electrochemistry using the method of matched asymptotic expansions, which is, in turn, utilized to compute osmotic pressure and Maxwell stress. The mechanical response of the IPMC arch is modeled as a plane strain problem with an induced state of eigenstress, which is solved with the use of a smooth Airy function. The accuracy of our analytical solution is validated through finite element simulations. Through a parametric analysis, we investigate the effect of curvature on the deformation and the reaction forces exerted by the clamps. The proposed analytical framework offers new insight into the response of curved IPMCs, in which progress on 3D printing should be grounded.
Design and implementation of a new fractional-order Hopfield neural network system
Authors: Zhou Ziwei , Wang Shuo
Published: January 2022

In this work, a novel chaotic system of fractional-order based on the model of Hopfield Neural Network (HNN) is proposed. The numerical solutions of the 4-neurons-based HNN fractional-order chaotic system are obtained by using the Adomain decomposition method. The dynamical performances of the 4-neurons-based HNN fractional-order chaotic system are explored through attractor trajectories, bifurcation diagrams, Lyapunov exponents, SE complexity and chaotic diagram based on SE complexity. In addition, the 4-neurons-based HNN fractional-order chaotic system is implemented based on the Multisim platform. The experimental results indicate that the 4-neurons-based HNN fractional-order chaotic system has rich dynamic behavior, and the influence of different order on the dynamical properties of the system are particularly great. This research will provide theoretical foundation and experimental basis for the hardware implementation and application of the 4-neurons-based HNN fractional-order chaotic system.
On Shapiro time delay in massive scalar-tensor theories
Authors: Dyadina P.I. , Labazova S.P.
Published: January 2022

The problem of defenition of the post-Newtonian parameter γ in massive scalar-tensor theories is considered. We demonstrate an equivalent correspondence between the post-Newtonian parameter γ and the parameter appearing in the equation of a null geodesic in massive scalar-tensor theories. We show that massive scalar-tensor theories can be distinguished from general relativity via the Shapiro time delay. All calculations are performed for hybrid metric-Palatini f(R)-gravity for the sake of illustration. The expression for Shapiro time delay in hybrid f(R)-gravity is obtained for the first time.
Reconstructing cosmic polarization rotation with ResUNet-CMB
Authors: Guzman Eric , Meyers Joel
Published: January 2022

Cosmic polarization rotation, which may result from parity-violating new physics or the presence of primordial magnetic fields, converts E-mode polarization of the cosmic microwave background (CMB) into B-mode polarization.
Anisotropic cosmic polarization rotation leads to statistical anisotropy in CMB polarization and can be reconstructed with quadratic estimator techniques similar to those designed for gravitational lensing of the CMB.
At the sensitivity of upcoming CMB surveys, lensing-induced B-mode polarization will act as a limiting factor in the search for anisotropic cosmic polarization rotation, meaning that an analysis which incorporates some form of delensing will be required to improve constraints on the effect with future surveys.
In this paper we extend the ResUNet-CMB convolutional neural network to reconstruct anisotropic cosmic polarization rotation in the presence of gravitational lensing and patchy reionization, and we show that the network simultaneously reconstructs all three effects with variance that is lower than that from the standard quadratic estimator nearly matching the performance of an iterative reconstruction method.
BOSS full-shape analysis from the EFTofLSS with exact time dependence
Authors: Zhang Pierre , Cai Yifu
Published: January 2022

We re-analyze the full shape of BOSS galaxy two-point function from the Effective-Field Theory of Large-Scale Structure at the one loop within ΛCDM with massive neutrinos using a big bang nucleosynthesis (BBN) prior, removing the Einstein-de Sitter (EdS) approximation in the time dependence of the loop, and, properly accounting for the redshift selection over the BOSS samples instead of assuming an effective redshift. We constrain, at 68%-confidence level (CL), the present-day matter fraction to Ωm = 0.322 ± 0.018, the Hubble constant to H
0 = 69.1 ± 0.14 (km/s)/Mpc, the log-amplitude of the primordial spectrum to ln (1010
A
s) = 2.97 ± 0.25, the spectral tilt to n
s = 0.938 ± 0.082, and bound the total neutrino mass to < 1.1 at 95%-CL. We find no significant shift in the posteriors of the cosmological parameters due to the EdS approximation, but a marginal difference in ln (1010
A
s) due to the effective redshift approximation of about 0.4σ, where σ is the 68%-confidence interval. Regarding the EdS approximation, we check that the same conclusion holds on simulations of volume like DESI in ΛCDM and wCDM, with a BBN prior. In contrast, for an approximate, effective redshift, to be assumed, we advocate systematic assessments on redshift selection for ongoing and future large-volume surveys.
Tracking the stochastic growth of bacterial populations in microfluidic droplets
Authors: Taylor Daniel , Verdon Nia , Lomax Peter , Allen Rosalind J , Titmuss Simon
Published: January 2022

Bacterial growth in microfluidic droplets is relevant in biotechnology, in microbial ecology, and in understanding stochastic population dynamics in small populations. However, it has proved challenging to automate measurement of absolute bacterial numbers within droplets, forcing the use of proxy measures for population size. Here we present a microfluidic device and imaging protocol that allows high-resolution imaging of thousands of droplets, such that individual bacteria stay in the focal plane and can be counted automatically. Using this approach, we track the stochastic growth of hundreds of replicate Escherichia coli populations within droplets. We find that, for early times, the statistics of the growth trajectories obey the predictions of the Bellman–Harris model, in which there is no inheritance of division time. Our approach should allow further testing of models for stochastic growth dynamics, as well as contributing to broader applications of droplet-based bacterial culture.
Solution of the simplified fluid dynamic equation for transient processes in a gas centrifuge
Authors: Zeng S , Borisevich V D , Smirnov A Yu , Sulaberidze G A
Published: January 2022

The equation describing a transient process in a gas centrifuge is a partial differential equation and has to be solved by using a numerical method. The Crank-Nicolson scheme and a central difference scheme are employed, respectively, for time discretization and space discretization. Under the condition of full circulation flow, the solution of the equation coincides with the result of the linear theory, verifying the correctness of numerical solution. The transient processes of a centrifuge are simulated with two withdrawal models to reveal the variations of the axial velocity with time in the processes. The results shows that for a given rotor peripheral speed, the radial distribution of the axial velocity depends mainly on the wall pressure and the withdrawal strength, but the influence of the withdrawals is much weaker than the wall pressure. The results also demonstrate that the partial differential equations describing the fluid dynamics in a transient process does exhibit the dynamic variations, and can be further applied to the analysis of separation performance.
Three-dimensional modeling of the flow around the gas scoop under optimal working regime of the Iguassu gas centrifuge at the hyper fast rotation
Authors: Bogovalov S. V. , Borman V. D. , Vasilyev A. V. , Tronin I. V. , Tronin V. N.
Published: January 2022

The problem of the gas withdrawal from an Iguassu gas centrifuge (GC) at the speed of rotation, over 1000 m/s is considered. We focus our attention on the problem of achieving of optimal waste flow and friction power of the gas scoop simultaneously. Calculations were carried out in a three-dimensional approximation for supersonic flow of UF
6 around a stationary gas scoop taken as a Pitot tube with a diameter of 2 mm. Attempts to achieve the optimal working regime of GC for the selected particular gas scoop were not successful. On the basis of this results we conclude that the optimal gas withdrawal and creation of the optimal axial circulation can be problematic for the hyper-speed gas centrifuges.
Ordinary cascades for purification of reprocessed uranium hexafluoride from 232, 234, 236U isotopes
Authors: Palkin V A , Maslyukov E V , Lubnin S S
Published: January 2022

Reprocessed uranium gained from the spent nuclear fuel contains 232, 234, 236U isotopes within, which considerably hamper its reuse. It is proposed to use an ordinary cascade to reduce the concentration of 232, 234U. The output purified from 232, 234U is obtained in the cascade waste. The authors analysed the peculiarities of reducing concentration of 236U after the enrichment of reprocessed uranium hexafluoride in terms of 235U in the ordinary cascade and its subsequent dilution. A computational experiment was performed. Parameters of cascade stages were predetermined, which allow to reduce the content of 232, 234, 236U to an acceptable level.
A simulation and experimental study of dual-wavelength dye laser amplifiers
Authors: Yang Q N , Zhang X W , Dai X K
Published: January 2022

AVLIS requires a high average power laser beam of multiple wavelengths. There are two general ways to achieve such a beam. One is generating different wavelength laser beams by individual dye laser MOPA chains, then spatially combining them by a beam combiner. The other is combining different wavelength laser beams into one beam first, then co-amplifying it by a common MOPA chain. The latter one is more efficient. To further develop the method, this paper demonstrates a simulation and experimental study of dual-wavelength dye laser amplifiers. The one of the most critical parameters of a dual-wavelength laser beam is the power ratio of the two constituent beams, which can vary during the co-amplification. The simulation results show that for two laser beams with small wavelength difference, the spatial combination mismatches of two beams are the more dominant factor than the spectral differences in affecting the power ratio during the co-amplification. The result of the experiment is in good agreement with the simulation.
Program for calculating the technological and structural characteristics of plate and packed distillation columns for separating two, multicomponent mixtures and isotopes
Authors: Sukhar P A , Orlov A A , Petrov M V
Published: January 2022

The article describes the developed and software implemented methods for calculating the technological and structural characteristics of plated and packed distillation columns for separating two-component, multicomponent and isotopic mixtures. The results of the verification of the methods are presented. A good convergence of the calculation results with the known literature data is shown.
Boron isotope separation by extraction method: features of the phase composition and flow reflux
Authors: Khoroshilov A V , Ivanov P I
Published: January 2022

The publication is devoted to comprehensive studies of boron isotope exchange in two-phase liquid-liquid systems and reflects the features of the extraction separation of boron isotopes, including reagent-free phase flow reflux. The achieved experimental values of the single stage enrichment factor are commensurate with the analogous values for the main production technologies ofr the 10B concentrating, and the reagent-free version of the flow reflux determines the competitiveness of such process. The method is considered an alternative to ion exchange and liquid chromatography, and, possibly, chemical exchange with the participation of boron trifluoride.
A Software Reuse Technology Based on Common Factor Method and Its Application in Fast Programming
Authors: She XF , Bian BB
Published: January 2022

In the application software development process with complex data content and constantly changing structure, it is difficult to cope with rapid changes in requirements only by relying on object inheritance and component technology, resulting in low software development efficiency. In order to improve the efficiency of software development, the paper proposes a software reuse technology based on the common factor method. In the process of writing code, first, use common factors to express the relationship between changes and unchanging parts; then; integrate component member variables, file UI component data initialization, data acquisition, addition, modification and verification, achieve more efficient code reuse. Taking the application practice of the research and development of the hospital nutrition department consultation software as a case, the research results show that the technology can quickly reuse the existing code, generate the code required for new requirements, ensure the quality of the software, and improve the efficiency of the development of the software.
Analysis of the Influence of AVC Reactive Power Optimization on Line Loss in High Proportion New Energy Area
Authors: Liu SC , Zhang J , Wang HB , Wang XM , Ma YF , Yan W
Published: January 2022

In order to effectively reduce line loss, this paper analyzes the impact of AVC reactive power optimization in high proportion new energy areas on line loss under typical mode, and calculates the impact of new energy output on line loss when net load changes, and summarizes the law of AVC reactive power optimization in high proportion new energy areas and the impact of new energy output changes on power grid line loss. The research results show that the line loss rate of the main grid and the line loss rate of each partial voltage tend to decrease in the three modes of new energy generation, small generation and zero generation.
Study on Calculation Method of Internal Force of Integral Abutment-Pile-Soil Interaction
Authors: Huang FY , Li L , Zhang F , Lin YW
Published: January 2022

Integral abutment jointless bridge (iajb) has the advantages of long service life, convenient construction and low construction and maintenance cost. At present, it has been widely used at home and abroad. Based on an actual iajb, an experimental model of integral abutment pile structure is designed and made. The quasi-static test is carried out under low cyclic displacement load, and the interaction between integral abutment, H-steel pile and soil is studied, with emphasis on the strain and bending moment of abutment and pile foundation. The test results show that the strain distribution of pile body is “Cup” shape when the abutment moves forward and “olive” shape when the abutment moves negatively. The maximum compressive stress and tensile stress under positive displacement load are greater than those under negative displacement load. Therefore, when the temperature increases, the internal force of pile foundation is greater than that when the temperature decreases, which means that H-shaped steel foundation pile is more unfavorable when the temperature increases in summer. In order to reduce the adverse effect of temperature on foundation piles, it is suggested that the overall closure temperature of the bridge should be slightly higher than the annual average temperature. In addition, the calculation also shows that when negative load is adopted, the pile bending moment calculated by these methods is not different from the test results, and the distribution law is similar to that of traditional foundation piles. However, under normal load, the pile bending moment calculated by classical theory or bridge code is quite different from the test results, and the distribution law is also different. In this paper, the moment of integral abutment pile-soil interaction is calculated accurately by polynomial fitting method and huanglin method, which can be used in practical engineering and provide reference for the design and application of iajbs.
A transmission line fault rate correction method for meteorological risk sources
Authors: Zhang F , Liu XM , Fan MZ , Dong X , Yu X
Published: January 2022

A transmission line fault rate correction method for meteorological risk sources is proposed in this paper. Firstly, a complex weather risk source model considering lightning, rainfall, wind, temperature, relative humidity and other meteorological factors is established by introducing the overrun penalty variable weight entropy theory, and the corresponding comprehensive meteorological factors are calculated by using the model; Then, based on the electrical equipment health index model, a transmission line fault rate correction method based on meteorological risk sources is designed. Finally, the effectiveness of the method is verified by simulation experiments.
Analysis and Research on Anti-seismic Scheme of Railway Simple Supported Beam Bridge
Authors: Li X , Li DY , Jia LZ , Song JP , Yue JS
Published: January 2022

In order to improve the seismic performance of railway simply supported beam bridges, the seismic design schemes in different seismic intensity areas are compared and analyzed in this paper. The results show that the relative displacement of beam piers is too large when the simply supported beam bridge (≥ 0.3g) in high intensity earthquake area only adopts damping and isolation bearings. In order to reduce the displacement after earthquake, it is necessary to increase damping energy dissipation devices. Simply supported beam bridge in low intensity earthquake area (≤ 0.2g) adopt shock-absorbing isolation bearing. The cost of bearing will not increase, and the safety of bridge under earthquake will be greatly improved. It is recommended to adopt isolation design in low intensity seismic area.
Dynamic response analysis of isolated curved beam bridge under multi-dimensional non-stationary random excitation considering the torsion component
Authors: Li XM , Wang JC , Pu K , Mu BH
Published: January 2022

The coupling effect of bending and torsion caused by plane irregularity of the isolated curved beam bridge makes its seismic response more complex than that of the isolated straight beam bridge. In order to study the influence of multi-dimensional non-stationary random excitation considering torsion component on seismic response of tqiongw@mls.sinanet.com he isolated curved beam bridge. The classical Bouc-Wen model was used to simulate the hysteretic characteristics of the curved beam bridge, and the nonlinear dynamic equation considering the eccentricity of superstructure was established. The pseudo excitation was transformed into harmonic external load by Euler formula, and combining with the precise integration method, the precise integration forms of the special solution under different modulation functions were derived. By using these integral forms to solve the response at each time, the time-varying variance of displacement of the isolated curved beam bridge under multi-dimensional non-stationary random excitation was obtained, and the law of time-varying variance of displacement, including the upper and lower structures of the isolated curved beam bridge, was analyzed with different deck width, curvature radius and yield ratio of bearing. The results show that the multi-dimensional non-stationary random excitation with torsion component has significant influence on the seismic response of the isolated curved beam bridge. Under the rare non-stationary random excitation, the dynamic response of the isolated curved beam bridge presents strong non-stationarity, and the time-lag phenomenon is apparent. For the isolated curved beam bridge with large deck width and small yield ratio of bearing, the influence of non-stationary random excitation on the structure is particularly obvious. The influence of non-stationary random excitation considering torsion component on dynamic response of the isolated curved beam bridge with large deck width, small curvature radius and large yield ratio of bearing is more significant.
Experimental analysis of corbel of pile slab subgrade
Authors: Lei J
Published: January 2022

In order to realize the reasonable design of new type pile slab subgrade, this study, relying on the reconstruction and expansion project of Lintou Longxi Interchange Section of G5011 Wuhe expressway, constructs a pile slab subgrade model with 15 holes and each hole is 6m. The weakest section of the corbel is determined by checking the mechanical performance of the corbel section, and the mechanical performance of the bracket of the new vertical limited expansion joint of the pile slab subgrade under the most unfavorable load is obtained by the full-scale model. Based on the separation modeling method, the nonlinear analysis of the full-scale specimen under the test loading condition with the load displacement curve in good agreement with the measured results is achieved. Combined with the static performance test of full-scale components, it is verified that the pile slab subgrade has good bearing capacity, which can be applied to engineering.
Evaluation method of building decoration engineering based on interactive information model
Authors: Liu T
Published: January 2022

In order to improve the accuracy of architectural decoration engineering evaluation, a new evaluation method based on interactive information model is proposed in this paper. First, the paper establishes iim model to complete the evaluation index system of architectural decoration engineering. Then, the weight vectors of the criterion layer and the target layer are determined by the mathematical analytic hierarchy process. Finally, the comprehensive evaluation result of low-carbon Green building design scheme is obtained by calculating the whitening weight function of each gray class. The experimental results show that the method has high accuracy and strong practicability.
Experimental verification and data analysis of Wet joint of pile slab
Authors: Zhang Y
Published: January 2022

In order to realize the reasonable design of the new-type pile-slab subgrade, this study relied on the reconstruction and expansion project of the G5011 Wuhe Expressway from Lintou to Longxi Interchange to construct a pile-slab subgrade model with 15 holes and 6m each. The displacement of the wet joint of the pile-slab subgrade was obtained through the full-scale model. Based on the separate modeling method, the load-displacement curve and the load-stress curve are in good agreement with the actual test results. Linear analysis. Combined with the full-scale component static performance test, it is verified that the wet joints of the constructed pile-slab subgrade are basically in the linear elastic working stage under the design load frequency combination condition, which can be applied to engineering.
Study on seismic mitigation Performance of Long-span High-speed Railway Continuous Beam Bridge with Viscous Damper
Authors: Quan W , Yu HM , Wen X , Liu ZX
Published: January 2022

Taking the 128m long-span high-speed railway continuous beam bridge commonly used in China as the example, a reasonable finite element analysis model with seismic mitigation devices of the bridges is established, and nonlinear dynamic time history analysis is used to analyze the seismic mitigation of viscous dampers. three seismic waves with the same peak acceleration but different spectral components are selected to perform optimization analysis on the viscous damper parameters, damping index and damping coefficient. Numerical analysis results show that: (1) The viscous damper can play a very good damping effect. (2) Under the action of the El Centro wave and Tianjin wave, the damping rates of the fixed pier reached more than 81%. Under the action of Taft wave, except for the relative displacement of the fixed-pier, the damping rates of the structure reached more than 74%; The internal force of the other piers and the displacement of the top of the pier increase, but the increase is not large compared with the response value of the fixed pier, and the forces on the piers tend to be uniform and reasonable. (3) The three kinds of seismic wave have different optimization results for the mechanical parameters of the viscous damper model. When selecting the actual devices parameters, the ground motion with the corresponding spectral characteristics should be selected according to the bridge site for optimization analysis. Besides, the devices structure, size requirement and other reason should be considered comprehensively.
Study on Mechanical Properties of Simply Supported Girder Bridge after Jointless
Authors: Guo WQ , Luo XY , Tang YF , Fu RH , Javanmardi A
Published: January 2022

The jointless bridges includes integral bridges, semi-integral bridges and extended deck bridges. The integral bridges adopts an integral abutment, and its main girder, abutment and pile under abutment are fixed together to bear the force together. The expansion joint and expansion device are cancelled, and the integrity, durability and driving comfort of the bridge are improved. In this paper, a simply supported girder bridge in Fujian Province of China is taken as the research background, and it is transformed into an integral bridge. Midas/Civil software is used to establish the finite element models of the original bridge and the integral bridge, and the mechanical properties of the main girder and the pile under the combined action of dead load and overall temperature rise of 25 °C are analyzed. The results show that due to the consolidation of the main girder and abutment of the integral bridge, the internal force at the girder end under the combined action of temperature and dead load is greater than that of the simply supported beam bridge. The pile deformation of the integral bridge is significant under the combination of temperature and dead load. With the increase of the height-to-thickness ratio of the abutment of integral bridge, the bending moment at the girder end and the mid-span are increasing. Different abutment height-to-thickness ratio has little influence on the horizontal displacement of the girder end of integral bridge. With the increase of height-to-thickness ratio of the abutment of integral bridge, the deformation of pile decreases. The flexible abutment with large height-to-thickness ratio can improve the mechanical properties of pile and achieve the purpose of protecting the pile.
Comparative study of numerical simulation methods for seismic pounding of adjacent girder of curved girder bridges
Authors: Jiao CY , Cheng MZ , Cheng H , Xiao X , Wu YF
Published: January 2022

Under seismic action, non-uniform collision will occur between the main beams of curved beam bridge, which may lead to local damage of front beam or rear beam. At present, the research on collision effect is mainly based on straight beam bridge, and there is still a lack of relevant research on seismic collision of curved beam bridge. Taking two adjacent typical curved bridges as examples, this paper establishes contact elements (linear elastic model, Kelvin model and Hertz model) and solid elements (three-dimensional contact friction model) which can fully reflect the physical characteristics of seismic collision of curved bridges. By comparing the numerical simulation methods of seismic collision, the advantages and disadvantages of the existing numerical simulation methods in the seismic response analysis of curved bridges are evaluated. The results show that the calculation results of Kelvin model and three-dimensional contact friction model have the least error and high calculation efficiency, and are suitable for the seismic analysis of curved beam bridges.
Research on distributed network attack source tracking method based on interference suppression
Authors: Hu PG , Chen XQ
Published: January 2022

In order to improve the security of distributed network operation, a distributed network attack source tracking method based on interference suppression is proposed. According to the structural characteristics of distributed network, the signal expression relationship between different distributed hosts is constructed, and the generalized cross-correlation weighting function is constructed to suppress the interference of distributed network. Based on this, particle swarm optimization algorithm is used to collect a sufficient number of attack marking information packets through multiple iterations. The interference signal of the separated signal is obtained through blind source separation. After signal separation, the tracking results of different attack source signals are obtained. The experimental results show that compared with the traditional attack source tracking method, this method not only reduces the tracking time, but also greatly improves the tracking accuracy.
The Optimization Method of Mechanical Fault Diagnosis Based on Artificial Intelligence Technology
Authors: Song JY , Li ZX , Li YX , Han DS
Published: January 2022

In order to overcome the problems existing in the traditional mechanical fault diagnosis, and to improve the accuracy of mechanical fault diagnosis, an optimization method of mechanical fault diagnosis based on artificial intelligence technology is proposed in this paper. The optimization method combines a variety of current popular high and new technologies, such as artificial intelligence technology, expert system and artificial neural network technology. at the same time, the optimization method also breaks the traditional mechanical fault diagnosis mode based on fuzzy set theory. Based on this, the optimization method also makes an in-depth analysis and research on artificial intelligence technology, which promotes the application and development of artificial intelligence technology, and expands the application scope and application field of artificial intelligence technology. The research results show that the optimization method can scientifically overcome the problems existing in the traditional mechanical fault diagnosis, and can improve the accuracy and scientificalness in the process of mechanical fault diagnosis, so it has strong feasibility.
Construction monitoring of cable stayed bridge with unequal span and single tower and single cable plane
Authors: Feng XQ
Published: January 2022

In order to improve the efficiency of bridge construction, a bridge construction monitoring method based on MIDAS civil finite element software is designed in this paper. Taking the construction monitoring of the main bridge of Huangshuihe bridge on Tonghai road in Xining City as an example, the monitoring parameters of the top deflection of the main tower and the simulation of temperature change during construction are described in detail. The effectiveness of the method is verified by the comparative analysis of theoretical data and measured data.
Thermomechanical Fatigue Life Prediction Method of the Trailing Edge Holes in the Turbine Blade for Turboshaft Engine
Authors: Qian Zhengming , Li Gaiqi , Mi Dong , An Xin
Published: January 2022

In this paper, a thermomechanical fatigue (TMF) life analysis method considering stress relaxation was established for turbine blade in a turboshaft engine. The nonlinear creep deformation of a superalloy is predicted by coupling creep damage in the framework of viscoplastic theory. The results revealed that the calculation error of the model for the elastic-plastic stress-strain curve was less than 5%, while the simulation accuracy for the creep curve is within the dispersion range of the inherent properties of material creep deformation. Based on the elastic-plastic creep analysis of a turbine blade, the creep damage and its evolution law of the leading edge and trailing edge of the blade are clarified, and a new method is provided for determining the local dangerous points on the blade. With the help of the linear damage cumulative life theory, the fatigue creep life of the trailing edge hole of a turbine blade considering the stress relaxation is obtained, which provides a more reasonable and better engineering application method for the blade life evaluation.
Creep Prediction Model of Concrete-Filled Steel Tube under Different Core Concrete Conditions
Authors: Xiong Zeyu , Zhang Rongling , Ma Lina , Hao Zhaofeng , Lv Wenda , Li Wenbo
Published: January 2022

To reasonably predict the creep law of concrete-filled steel tubular (CFST) members under different working conditions, four groups of creep tests were carried out, and the creep curves of CFST specimens with defects were obtained. Based on the creep prediction formula given in the code for the design of CFST highway arch bridges issued in 2015, the creep prediction models of CFST under different core concrete conditions are studied. The results show that the concrete microcracks around the cavity defects are continuously generated and expanded during the compression process, resulting in the dislocation and sliding of the concrete. It increases the additional deformation of CFST; debonding defects hinder the redistribution of stress between the steel tube and the core concrete, weaken the interaction effect between the steel tube and the concrete, and increase the creep deformation of the core concrete. According to Different core concrete states, appropriate reference factors are selected to modify the creep prediction formula of CFST, which greatly improves the creep prediction accuracy of CFST members and defective members.
Fatigue Damage of Stayed Cables Due to Buffeting Induced by Eastern-Zhejiang Typhoon
Authors: Peng Wei
Published: January 2022

In this paper, a 450 km simulation circle method is used to extract all meteorological records from 1949 to 2018, and to obtain random samples. The Yanmeng typhoon wind field model is compiled by MATLAB, the optimal typhoon wind profile index α is calculated. The harmonic superposition method is used to simulate the typhoon wind field at the construction site. Stress time-history of cables under buffeting is analyzed using ANSYS and MATLAB. Palmgren-miner linear cumulative fatigue damage method is used for fatigue damage analysis, combined with rain flow counting method and S-N curve. It is shown that the damage value of cable increases with the growth of wind speed. The damage of cable has a similar trend with the variance of axial stress. The cable of middle span, about an eighth of the way to bridge tower, is extremely sensitive to the wind. The low stress region is the main circulating region of the cable. The region of low stress expands with the increase of wind speed. The amplitude of cable stress mainly circulates from low amplitude to high amplitude with the increase of wind speed.
Effect of Zr-La-TiO2 Catalyst on Denitrification for Coal Combustion
Authors: Cheng Weiliang , Liu Meng , Fu Yi , Liu Mingzhu , Wang Shuqin
Published: January 2022

Nanocomposites of TiO2 co-doped with La and Zr were prepared using the microwave-assisted sol-gel method. The samples were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), X-ray photoelectron spectroscopy (XPS), energy dispersive spectroscopy (EDS) and specific surface area measurement (BET). The XRD results revealed that all the catalysts showed an anatase phase. It was found that the particle size of La-Zr-TiO2 is much smaller than pure TiO2. Moreover, the denitrification efficiency of La-Zr-TiO2 was 65.77%, which was higher than that of the pure and mono-doped TiO2 in the experiment.
Effect of Fly Ash Content in Shotcrete on Mechanical Properties
Authors: Wu Bin , Chai Mingming , Li Shijia , Yang Jianping
Published: January 2022

As one of the key technologies of NATM (New Austrian Tunnel Method) construction, shotcrete has advantages such as simple, fast and adaptable technology, and becomes an indispensable modern construction method in tunnel construction. Adding some fly ash into shotcrete can reduce cracks, compensate shrinkage and improve workability. In this paper, raw materials are selected for mix design, and the mechanical properties of shotcrete with different fly ash content are experimentally studied. The test results show that the 28d compressive, flexural and tensile properties of sprayed concrete shotcrete gradually decrease with the increase of fly ash content. In order to avoid too much strength reduction and ensure structural safety, the fly ash ought to be controlled within a certain amount in the actual construction process.
Study on the Performances of an Anticoagulant Ice Coating Material for Asphalt Pavement
Authors: Wang Mingming , Gao Huarui , Chai Mingming , Sun Zhiping , Wang Jiawei
Published: January 2022

In order to improve the anti-icing performance of asphalt pavement and alleviate the effect of pavement freezing, the method of coating anticoagulant ice coating on the surface of asphalt pavement is adopted. In this article, application research is conducted on an anticoagulant ice coating material on asphalt pavement using standard test methods. With different dosages of anticoagulant ice agent, the major performance indexes, including the freezing point and ice adhesion on coating surface, of anticoagulant ice coating material are compared. By comparing and analyzing the results, the transformation rules and optimum dosage of anticoagulant ice agent are achieved. The results of this paper can effectively alleviate the freezing phenomenon of pavement and improve the traffic capacity of pavement.
Effect of Alkaline-Earth Metal Oxide on Compressive Strength and Flexural Strength of Alkali-Activated Slag Cement Mortar
Authors: Zheng Dengdeng , Ji Tao , Wang Guojie
Published: January 2022

The effect of CaO and MgO content on the compressive strength (CS) and flexural strength (FS) of alkali-activated slag mortar (ASM), which was activated by NaOH (Na2O% = 4%), was investigated. The pore structure of alkali-activated slag paste was investigated via mercury intrusion porosimetry (MIP). The morphology of ASM was observed by field emission scanning electron microscope (FSEM). The study shows that the CS and FS of ASM, which was activated by NaOH, increase first and then decrease with the improvement of CaO and MgO content. The optimal CaO and MgO content for CS are both 9% of the slag mass. The CS of ASM with optimal CaO and MgO content can achieve 46.54MPa and 47.79MPa, respectively. The optimal CaO and MgO content for FS are 6% and 3% of the slag mass, respectively. The FS of ASM with optimal CaO and MgO content can achieve 11.23MPa and 11.11MPa, respectively. The comprehensive mechanics performance of ASM are the best, when the CaO content is 6%.
Study of the Test Methods of Emission Rates in Different Ambient Temperature Fields
Authors: Zhao Xia , Jia Xin , Pei Lining , Shi Qufei , Wu Jian
Published: January 2022

With the wide application and rapid development of infrared temperature measurement, which has attracted wide spread interest in the field of non-contact temperature measurement due to its unique advantages. Measurement of the real temperature of the measured object is an important task in many disciplines, especially critical and difficult for the non-contact measurement. However, the accuracy of the infrared thermography technique is difficult to reach a satisfactory level, and cannot meet the requirements of high accuracy, due to the emissivity cannot be determined in outdoor environments. It is very meaningful to determinate the emissivity and accurate temperature of the object in outdoor heterogeneous environments. The influence of external environmental factors on the object surface emissivity are analyzed in this study, which is very important to improve the measurement accuracy of the infrared thermal imaging instrument. This study reveals that the increased temperature will lead in the increase of the emissivity of nonmetallic materials first and then decreases slowly. In addition, as the ambient temperature higher, the emission rate of non-metallic object becomes smaller.
Failure Mechanism of Water Wall Coating Prepared by Supersonic Arc Spraying
Authors: Yu Weixin , Tao Kangning , Dai Zhen , Zhang Yiwen , Chu Xi
Published: January 2022

In order to meet the requirements of environmental protection, low nitrogen combustion is widely used in thermal power plants, which causes serious high temperature corrosion of water wall on fire side. At present, some power plants use water wall anti-corrosion coating to improve their service life. n this paper, a power plant water wall coating off to explore, analysis of water wall corrosion mechanism and coating failure reasons. The results show that: The direct reason for the large-scale peeling off water wall coating is that S element penetrates through the pores of the coating and corrodes the coating, resulting in the decrease of the adhesion between the coating and the substrate and the generation of a large number of microcracks. The microcracks continue to expand and extend under the action of thermal stress and S corrosion, which eventually leads to the large-scale peeling off the coating.
Study on the Luminescence Properties of ZnS:Mn2+ Particles by High Temperature Solid Phase Method
Authors: Qian Xinyi , Chen Caifeng
Published: January 2022

ZnS has attracted wide attention for its potential applications in optoelectronic fields, such as solid-state lighting, fluorescent probes, electroluminescent devices and field emission displays. In this work, Mn2+-doped ZnS with hexagonal structure were prepared by high temperature solid phase method using MnCO3 as manganese source, and the effect of Mn2+ doping on ZnS was studied. The results show that the particle shape of ZnS doped with Mn2+ is hexagonal structure, Mn2+ doping changes the position and intensity of ZnS absorption spectrum and photoluminescence band. The absorption peak at 340 nm progressively moves to the right as Mn2+ doping rises, a new conspicuous absorption peak forms in the visible area, and the maximum photoluminescence intensity of ZnS:Mn2+ steadily increases. However, when the Mn2+ doping exceeds the ratio of 4 at.%, the photoluminescence intensity showed a decreasing trend. This indicates that the number of effective emission centers reaches the maximum when the doping concentration of Mn2+ is the most suitable.
Research on the Influence of Environmental Pressure on the Combustion Characteristics and Fire Spread of Building External Wall Insulation Materials
Authors: Wei Xiaoli , Ding Chao , Lan Qingyuan , Cheng Binghong , Zhu Nannan , Wang Xianwei
Published: January 2022

Building external wall insulation materials are widely used in the construction industry, which is one of the main materials for building energy saving. In order to study the combustion characteristics and fire spread behaviour of typical exterior wall materials at different pressures. Four environmental pressures of 40KPa, 60KPa, 80KPa, and 101KPa were set in an experimental cabin, measuring the quality, temperature, heat radiation, and heat flow of rigid polyurethane foam (RPU) through experiments. The experimental results are as follows: the masses loss curve of RPU combustion approximately obeyed the quadratic curve, which was similar to the general solid fuel combustion law; the mass change was the most dramatic at 101KPa, the lower the pressure, the slower the mass change; as the pressure decreased, the flame temperature increased slightly, and the spread of the fire slowed down; as the pressure decreased, the peak value of the thermal radiation curve decreased, and the curve tends became flat, but the horizontal axis time increased, indicating that the total heat release remained the same.
Recent advances of engineered and artificial drug delivery system towards solid tumor based on immune cells
Authors: Sun Zhuqing , Chen Jingtong , Chen Guangcun , Zhang Can , Li Chunyan
Published: January 2022

Precise drug delivery in cancer treatment is a long-standing concern of modern medicine. Compared with traditional molecular medicines and nano-medicines, emerging cell-based biomimetic delivery strategies display numerous merits, including successive biological functions, innate biocompatibility and superior security since they originate from living organisms, providing a very promising approach. Among them, immune cells receive increasing attention because of their inherent ability in tumor resistance, pathogen elimination, and other significant physiological functions. Herein, we investigated the recent advances on immune cell-based high efficient delivery and therapeutic strategies in solid tumor treatment, mainly focus on T cells, natural killer cells and macrophages, which have been used as drug cargos directly or provided membrane/exosomes as nanoscale drug delivery systems. We also discuss the further potential applications and perspective of this innovative strategy, as well as the predictable challenges in forward exploration in this emerging area.
The response of bioactive titanium surfaces with different structure to UVC-irradiation to eliminate the negative effect on biological properties during aging time
Authors: Zuo Rui , Lu Xugang , Wei Changsheng , Xiong Shibing , Chen Jun , Zhang Siqi , Huang Ping , Yang Bangcheng
Published: January 2022

The biological aging of titanium implants affects the service lifetime negatively in clinical applications, and Ultraviolet (UV) irradiation is an applicable method to overcome the biological aging. This study investigated the changes in surface characteristics and biological properties of bioactive titanium surfaces with different structure and topography after Ultraviolet C (UVC) irradiation. The bioactive titanium surfaces were prepared by anodizing (AO), sandblasting and acid-etching (SLA), acid-alkali etching (AA), alkali-heat etching (AH) methods. Samples were stored at dark for 7 weeks to simulate biological aging process and then irradiated by UVC for 2 h. The results showed that the hydroxyl groups (Ti-OH) on surfaces, which are crucial to enhance the biological properties, were easier to be generated on AO surfaces by UVC-irradiation, owing to a mixture of anatase and rutile on surfaces. UVC-irradiation had the strongest effect on AO surfaces to enhance the bioactivity in bone-like apatite deposition and better biocompatibility in mesenchymal stem cells (MSCs) attachment and proliferation. Therefore, titanium surfaces with a mixture phase of anatase and rutile have the potential to effectively utilize the benefits of UVC-irradiation to overcome the negative effects of the biological aging and have a promising clinical application prospect.