bluuebunny/crossref_metadata_2025_split huggingface dataset:
Evaluation of measurement uncertainty of HMP155A humidity sensor based on correlation analysis of input quantities
Authors: Wei Mingming , Wen Chunhua , Li Changchun 
Published: March 2022

Abstract
In view of the current situation that when the humidity sensor used GUM to evaluate the measurement uncertainty, the correlation between the input quantities was not analyzed. We taked the measurement result of the HMP155A humidity sensor at 55% RH as the research object, and analyzed the correlation of its input quantities. After compatibility judgment and calculation of correlation coefficients, the correlation degree was quantified. The evaluation results show that the extended uncertainty of the forward and reverse stroke are both 1.2%RH. The research results show that the measurement uncertainty deviated when the correlation between input quantities was not analyzed, which can easily lead to errors in the determination of instrument conformity. Using this method can effectively make up for the lack of correlation analysised in GUM’s evaluation of humidity sensors in the past, the evaluation content is closer to reality, and the evaluation results are more true and reliable.
Simulation and Optimization Design of Large Wave Power Generation Device Based on Group Array Module
Authors: Cai Nianqi , Li Detang , Zhang Shushu , Wang Jun , Gao weipeng 
Published: March 2022

Abstract
Based on the research achievements of the Haiyuan 1 oscillating buoy wave power generation device, this paper proposes the innovation about a group array of the buoy to increase the output of power generation and realize large-scale power generation. Firstly, the conversion efficiency of wave energy captured by buoys of arrays 3, 6, and 9 for power generation is theoretically estimated. According to wave theory, the energy conversion efficiency of buoy increases with the increase of array number. Then, the modeling and simulation of the buoy array wave energy generation system are carried out by using AMESim simulation software. Through the simulation and optimization of the parameters of the components in the array buoy storage power generation system, the stability and efficiency of the wave power generation device under different array buoys are studied. The simulation results show that by adjusting the volume of the accumulator, precharge pressure and the displacement of the hydraulic motor, the power generation system can not only realize the continuous power output, but also the power output increases with the increase of the number of accumulators. It is proved that the feasibility and rationality of the designed buoy power generation system in group array module, and the research results can make a reliable technical reference for the construction and implementation of large-scale wave power generation system.
Some Major Studies in Experimental Verifications of Bell Inequality
Authors: Tang Jiangmei , Zeng Qingsheng , Zhang Yandong , Qiu Tian 
Published: March 2022

Abstract
Bell inequality plays a crucial role in the debate between quantum mechanical completeness and local realism. It vigorously promoted researches on these aspects, macroscopic quantum superposition states, especially entangled states, and it has brought the debate from theory to experiment, which generated a new discipline, quantum information theory. Thus, this work briefly summarizes some major situations in the verification process of Bell inequality. At the same time, this work analyses existent some problems in the verification process of Bell inequality, and states own perception for the debate.This work can help people better understand the foundation knowledge of quantum information theory, thus quantum information theory can be applied to more actual situations.
Research and application of hydrodynamics modeling of channel in reservoir area-Case of Feilaixia station to Qingyuan station section
Authors: Wang Taiwei , Liu Li , Zhu Weiwei , Wang Yafei 
Published: March 2022

Abstract
In navigable rivers, channel depth and current are the main influencing factors of channel environmental risk, ship navigation mainly relies on channel maintenance water depth information regularly issued by channel departments as guidance, but the long forecast interval limits the full utilization of channel resources to a certain extent. In this paper, by studying the characteristics of the channel from Feilaixia to Qingyuan reservoir area, established the terrain model mesh for the section of the study area, and the two-dimensional shallow water equations are constructed as the control equations of flow simulation. The Model parameters are calibrated and verified. The typical schemes of the channel in the study area were simulated to obtain the channel water depth and velocity information, and the results were visualized, analyzed and discussed. Using two-dimensional hydrodynamic model to simulate channel conditions and calculate flow conditions can provide data support for ship navigation, which has important practical significance for improving navigation management ability.
Study on the dynamic characteristics of stable formation of single droplet in gas-liquid co-flow device
Authors: Gao Shanshan , Liu Zhaomiao , Li Mengqi , Ren Yanlin , Zheng Nan , Cai Fanming 
Published: March 2022

Abstract
The dynamic characteristics of the stable formation of a single droplet in a gas-liquid co-flow device are studied experimentally. The scaling laws of the dimensionless necking radius R of a droplet with dimensionless remaining time τ for different parameters are analyzed, and the reasons for the transformation between these scaling laws are discussed. The results show that the change in the main pressure has little effect on the scaling law. In the earlier necking, R follows a 1/5 power law with respect to τ. In the later collapse, a 2/3 power law is matched. When the auxiliary pressure changes, the pneumatic shear force has a large impact on the earlier necking, causing the scaling law to change, but only a slight effect on the later collapse. Simultaneously, the droplet size and jet limit length decrease significantly with an increase in auxiliary pressure. The results are of great significance for revealing the mechanism of droplet formation and reducing droplet formation size in gas-liquid co-flow devices and provide a theoretical reference for further study of stable droplet formation.
Mechanical Properties and Mechanism Analysis of Magnetorheological Shear Thickening Colloid
Authors: Fu Yankai , Du Chengbin 
Published: March 2022

Abstract
Magnetorheological shear thickening material is a new type of composite material, which has both magnetorheological properties and shear thickening properties.In this paper, the influence of two important factors to the magnetorheological properties and shear thickening properties have been studied. The factors includ boric acid status and the ratio of polydimethylsiloxane to post-treatment boric acid in the material fabrication process .The article also systematically analyzed the action mechanism of the magnetorheological shear thickening material, mainly explained the internal mechanism of cycle that the material changes from the initial chaotic state to the formation of a three-dimensional micro-magnetic particle chain network, and then returns to the initial state. The study of material preparation parameters provides an experiment basis which can provide parameter for the preparation of materials with specified properties.The clarification of the material mechanism provides an idea for the subsequent quantitative analysis of the action of carbonyl iron particles in the material under the three force systems, and provides a theoretical basis for the subsequent study of the material’s kinetic model.
Amplitude reduction optimization of time delay semi-active control for aircraft landing gear shimmy
Authors: Li Feifan , Zhao Yanying 
Published: March 2022

Abstract
Considering the time delay issue in the process of aircraft landing gear shimmy, the time delay semi-active control is used to achieve the purpose of amplitude reduction optimization. Firstly, in order to eliminate the influence of dimensionality and make the results better describe the objective universal law, after dimensionless treatment of the shimmy equations, the influence of dimensionless lateral bending damping coefficient and lateral bending stiffness coefficient of strut on the shimmy amplitude is analyzed. Then, in order to further reduce the amplitude, the time delay semi-active control term is introduced into the shimmy equations, and a mathematical method for solving the characteristic equation of the time-delay dynamic equation is proposed. Designing optimization criterion limits the amplitude of the first resonance to a small enough range. The time delay semi-active control can achieve good vibration reduction effect in the whole frequency domain and eliminate the second resonance. Finally, it is verified and compared in the frequency domain and time domain, the correctness of the calculation and the superiority of time delay semi-active control are proved.
Effect of strain-induced polarization field on band structure of MoS2 nanoribbon
Authors: Dan Minjiang , Hu Gongwei , Liu Nian , Zhang Yan 
Published: March 2022

Abstract
Single-layered transition metal dichalcogenides (TMDs) materials show intriguing device application potential due to their superior adjustability under various mechanisms. External strain can produce huge polarization fields inside two-dimensional piezoelectric semiconductor materials to modulate the relevant properties. In this paper, the strain-induced polarization field in monolayer zigzag MoS2 nanoribbon is specifically discussed. For comparison, we also study the deformation potential by means of the strain-modified bond lengths and hopping energies. The edge states and band gap indicate a distinct change due to polarization field. This work can put forward feasible perspectives for designing low-dimensional materials-based devices.
The Progress of Magnetoactive Origami Structures
Authors: Song Ruiyu 
Published: March 2022

Abstract
Contemporarily, smart materials are utilized for origami fabrication to achieve self-assembly under external stimulation. This technique provides a method to realize remote control of origami structures that can be applied to a variety of areas, e.g., biomedicine and robotics. Thereinto, magnetoactive origami structures were demonstrated in many studies, including the fields of medicine, soft robotics, biotic structure. Their design and manufacture incorporate structural mechanisms, material and additive manufacturing technology, as well as control strategies. This review summarizes existing magnetoactive origami structures as well as their materials and properties. Besides, potential directions and development suggestions are proposed for researchers in the fields of both origami structure and smart magneto-sensitive smart soft materials.
Thermal impact on ultrafast helicity independent all-optical switching of GdxCo100-x
Authors: Fan Xiaofei , Lin Xiaoyang 
Published: March 2022

Abstract
Ultrafast all-optical switching by single femtosecond laser pulse has recently been considered as one of the most potential technologies for the application on high-speed and energy efficient memory device. Here, to ensure such a sophisticated technology to be applicable to more complex environments, we report the dependence of all-optical switching of the ferrimagnet, GdCo, on the ambient temperature. Through heating the GdCo film up to 380 K, we demonstrate the distinct magnetic behaviours and the critical laser fluences of all-optical switching under different composition of Gd. It is found that the thermal stability for AOS will be significantly improved when there are more rare-earth elements, Gd in GdCo. This work provides a deep insight into the thermal effect on helicity independent all-optical switching and will optimize the application of ultrafast technology on the spintronic devices and magnetic memories.
Impact and quasi-static bending tests for a novel composite structure of ceramic and polymeric matrix composites
Authors: Kong Weiyi , Yang Yang , Zhang Xuan , Bao Jiawei , Wang Yangwei 
Published: March 2022

Abstract
To resolve the dilemma between impact resistance and structural stiffness of fan containment casing of modern civil aeroengines, a novel composite structure (CS) is proposed. It combines the hard and stiff ceramic which layered at the impact side and the lightweight and tough polymeric matrix composites (PMC) on the back side. The new structure was tested under ballistic impact loadings and quasi-static four-point bending. The results indicate that the impact resistance of the new structure is improved, compared with the PMC-only samples. Meanwhile, the bending stiffness of the new structure is also substantially larger at the cost of much lower bending strength.
Research on Detonation Growth Characteristics of the Cast CL-20
Authors: Li Shuang , Fan Wenqi , Shen Chen , Yan Shi , Liu Hailun , Nie Jianxin , Guo Xueyong 
Published: March 2022

Abstract
In order to study the detonation growth characteristics of the cast CL-20, shock initiation experiments were carried out. The ∅50mm samples content of 84wt% CL-20, 5wt% mental fuel and 11wt% HTPB binder were prepared. The one-dimension Lagrangian gauge measuring method was used to obtain the pressure histories of the cast CL-20. The results showed that when the loading pressure decreased, the growth of the leading shock wave speed and the front pressure of the explosive slowed down and the time to form a stable detonation was longer. The binder elastomer network effectively reduced the shock wave sensitivity of the cast CL-20 and the critical initiation pressure is 1.40GPa∼2.17GPa. A two-dimension axisymmetric shock initiation numerical model was established. The adaptive genetic algorithm compiled by MatLab was used to call the nonlinear finite element fluid dynamics software (LS-DYNA) to calculate the reaction rate equation parameters of the ignition growth model of the cast CL-20 combined with the results of shock initiation experiments.
Dynamic Behavior of Clay with different Density under Planar Impact
Authors: Li Jin , Li Yunliang , Wu Zutang , Tan Shushun , Zhou Gang , Zhang Guanjun 
Published: March 2022

Abstract
The dynamic behaviour of clay with different initial density was researched by a single-stage light gas gun. Soil samples with four initial density (1.7, 1.8, 1.9 and 2.0 g/cm3) were investigated in this study, the water content, graininess and raw material of which were the same. Four electromagnetic particle velocity gauges were embedded directly into each sample, which was compressed by clay powder. And the motions of shock wave were detected by these gauges. Typical waveforms of the particle velocity and the Hugoniot data of the experiments were presented. The dynamic stress-strain relation could be determined by the Lagrangian analysis method which was utilized to the four particle velocity waveforms. The results show that, the initial density was possibly the most important factor to affect the dynamic behaviour of soft clay soil under intense dynamic load compared with the water content.
Simulation Research on Die Forging Process Optimization of the FDN Type Anti-vibration Hammer Head in UHV Transmission Lines
Authors: Liu Xuliang , Gao Chao , Zhang Shiyao , Li Dongqing , Gu Jian , Si Jianjun , Liu Shengchun 
Published: March 2022

Abstract
Traditional anti-vibration hammer heads are mainly manufactured by gravity casting technology, which has many internal defects and limited mechanical properties, which cannot meet the technical requirements for higher-strength anti-vibration hammers in the construction of UHV transmission lines. Die forging is an advanced material forming process for producing low defect and high strength anti-vibration hammer. However, the process parameters should be strictly controlled to realize the complete filling of forgings and reduce the damage of forgings and dies.In this paper, the die forging process of the FDN type anti-vibration hammer head was simulated by using Deform-3D software platform, and the optimal forging process parameters were proposed as follows: the diameter of the blank is 65mm, the length of the blank is 184mm, the pressing speed of the upper die is 200mm/s, and the preheating temperature range of the blank is 800?∼1000?. The mechanical properties of the anti-vibration hammer after process optimization met the requirements of the corresponding strength grade products.
LBL assembly of Ag@Ti3C2T
X
and chitosan on PLLA substrate to enhance antibacterial and biocompatibility
Authors: Wang Haibo , Dong Ao , Hu Kun , Sun Weiwei , Wang Jundong , Han Lu , Mo Lixin , Li Luhai , Zhang Wei , Guo Yan , Zhu Li , Cui Fuzhai , Wei Yen 
Published: March 2022

Abstract
Poly L-lactic acid (PLLA) is a non-toxic, biocompatible degradable polymer material with excellent mechanical properties after moulding. However, it faces challenges in the use of biomedical materials because of its intolerance to bacteria. Here, we use an easy-to-operate method to prepare a composite multilayer membrane: PLLA membrane was used as substrates to assemble positively charged chitosan and negatively charged Ag@MXene on the surface using the layer-by-layer (LBL) method. The assembly process was detected by fluorescein isothiocyanate-labelled chitosan and the thickness of the coating multilayer was also detected as 210.0 ± 12.1 nm for P-M membrane and 460.5 ± 26.5 nm for P-Ag@M membrane. The surface self-assembled multilayers exhibited 91.27% and 96.11% growth inhibition ratio against Escherichia coli and Staphylococcus aureus strains under 808 nm near-infrared laser radiation with a synergistic photothermal antibacterial effect. Furthermore, best biocompatibility of P-M and P-Ag@M membranes compare to PLLA membrane motivated us to further explore its application in biomedical materials.
Environmental justice criteria for new land protection can inform efforts to address disparities in access to nearby open space
Authors: Sims Katharine R E , Lee Lucy G , Estrella-Luna Neenah , Lurie Margot R , Thompson Jonathan R 
Published: March 2022

Abstract
Substantial funding is being allocated to new land protection and access to protected open space for marginalized communities is a crucial concern. Using New England as a study area, we show striking disparities in the distribution of protected open space across multiple dimensions of social marginalization. Using a quartile-based approach within states, we find that communities in the lowest income quartile have just 52% as much nearby protected land as those in the most affluent quartile. Similarly, communities with the highest proportions of people of color have just 47% as much protected land as those in the lowest quartile. These disparities persist across both public and private protected land, within urban, exurban and rural communities, for different sized buffers around communities, and across time. To help address these disparities in future conservation plans, we develop a screening tool to identify and map communities with high social marginalization and low nearby protected open space within each state. We then show that areas prioritized according to these environmental justice (EJ) criteria are substantially different from areas prioritized according to conventional conservation criteria. This demonstrates how incorporating EJ criteria in conservation prioritization processes could shift patterns of future land protection. Our work provides methods that can be used broadly across regions to inform conservation efforts.
Lie algebra for rotational subsystems of a driven asymmetric top
Authors: Pozzoli E , Leibscher M , Sigalotti M , Boscain U , Koch C P 
Published: March 2022

Abstract
We present an analytical approach to construct the Lie algebra of finite-dimensional subsystems of the driven asymmetric top rotor. Each rotational level is degenerate due to the isotropy of space, and the degeneracy increases with rotational excitation. For a given rotational excitation, we determine the nested commutators between drift and drive Hamiltonians using a graph representation. We then generate the Lie algebra for subsystems with arbitrary rotational excitation using an inductive argument.
The Gelfand–Tsetlin basis for infinite-dimensional representations of

gln(C)
Authors: Antonenko Pavel V 
Published: March 2022

Abstract
We consider the problem of determination of the Gelfand–Tsetlin basis for unitary principal series representations of the Lie algebra

g

l

n

(

C

)

. The Gelfand–Tsetlin basis for an infinite-dimensional representation can be defined as the basis of common eigenfunctions of corner quantum minors of the corresponding L-operator. The construction is based on the induction with respect to the rank of the algebra: an element of the basis for

g

l

n

(

C

)

is expressed in terms of a Mellin–Barnes type integral of an element of the basis for

g

l

n
−
1

(

C

)

. The integration variables are the parameters (in other words, the quantum numbers) setting the eigenfunction. Explicit results are obtained for ranks 3 and 4, and the orthogonality of constructed sets of basis elements is demonstrated. For

g

l

3

(

C

)

the kernel of the integral is expressed in terms of gamma-functions of the parameters of eigenfunctions, and in the case of

g

l

4

(

C

)

—in terms of a hypergeometric function of the complex field at unity. The formulas presented for an arbitrary rank make it possible to obtain the system of finite-difference equations for the kernel. They include expressions for the quantum minors of

g

l

n

(

C

)

L-operator via the minors of

g

l

n
−
1

(

C

)

L-operator for the principal series representations, as well as formulas for action of some non-corner minors on the eigenfunctions of corner ones. The latter hold for any representation of

g

l

n

(

C

)

(not only principal series) in which the corner minors of the L-operator can be diagonalized.
Design and physical validation of a non-planar interlocking element for tubular structures
Authors: Ermolai V , Sover A , Nagîţ G 
Published: March 2022

Abstract
An interlocking topological structure represents an arrangement of parts designed so that the degrees of freedom of each component are takeover by the surrounding neighbours. For the planar arrangements, there are multiple possibilities to design such assemblies via platonic solids such as tetrahedron, cube, octahedron and osteomorphic geometries. This paper describes the geometrical modelling process of a non-planar interlocking element that can be used to produce tubular structures. The geometric element was defined by two curved surfaces identified with the inner and outer shell of the tubular structure and joined by six curved surfaces, providing through those the interlocking design. The virtual geometry was produced using an additive manufacturing process generating the physical model of a tubular construction assembled from non-planar interlocking elements.
Rapid prototyping method for replacing non-circular gears
Authors: Rizescu D , Besnea D , Rizescu C , Moraru E , Panait I 
Published: March 2022

Abstract
The paper presents a modern method of obtaining non-circular gearwheels from by means of additive technologies. Such a method is useful in case of wear or failure of a mechanical gear which has in its composition such non-circular metal gearwheels in the case of technical systems that must ensure continuous operation. With the help of the FDM technology (Fused Deposition Modeling) it will be created a model of the non-circular gearwheel that will constitute casting model for future gear, or they can even be used as functional gears if a suitable material and a precise execution technology with optimal printing conditions are considered.