bluuebunny/crossref_metadata_2025_split huggingface dataset:
An optical apparatus for inspecting adjacent surfaces defects of TEC components with equal-optical-path confocal imaging using optical wedge prisms
Authors: Shaobin Yan , Yafan Duan , Qilu Huang , Heng Zheng , Yantang Huang , Tingdi Liao 
Published: March 2022

Abstract
An optical apparatus with equal-optical-path confocal imaging has been proposed for simultaneously inspecting adjacent surfaces defects of thermoelectric cooler (TEC) components. The equal-optical-path confocal imaging of two adjacent surfaces with the desired separation can be obtained by using two optical wedges in the two optical imaging paths respectively. The optical apparatus has been designed and experimental investigations on defects inspection of two adjacent surfaces of TEC components have been conducted. The results showed that the proposed optical apparatus allows one to simultaneously inspect the defects of adjacent surfaces of TEC components. It was concluded that the optical apparatus can meet the technical requirements for inspecting adjacent surfaces defects of TEC components. The apparatus has advantages of freedom for imaging adjustment, increased inspection accuracy and improved system reliability etc. It has been found applications in the intelligent defects inspection system of TEC components.
Synthesis and research of a kind of perylene imide discoid molecule
Authors: Zhu Lei , Wang Ying , Wang Wenguang , Wu Xianyao , Wu Ti 
Published: March 2022

Abstract
Discotic liquid crystal molecules are excellent organic semiconductor materials due to their high carrier mobility. Dibenzocoronene derivatives obtained by nuclear expansion with perylene diimide as a matrix are one of the discotic molecules. The key factor for the application of this type of molecule is that it can form stable and long-range ordered organic nano-scale thin films. It can be used as an efficient carrier transport channel. This paper intends to use the “channel effect” to obtain the corresponding long-range orderly ideal film. The “channeling effect” referred to in this article is to bond functional discoid molecules on the substrate firstly, than generate the corresponding self-assembled monomolecular membranes (SAMs) to form an ordered channel on the surface which strongly induces and restricts the discoid molecules that arranged in parallel and orderly with each other along the “channels” created on the surface of the SAMs. Perylene diimide derivatives are a kind of good electron transport materials, which are characterized by high carrier mobility, low processing cost, and good thermal stability. However, it has the large rigid core and the melting point is relatively high. In this paper, a monobenzocoperylene diimide derivative is designed and synthesized, which will have a strong effect on the surface of the silicon substrate, and reduce the molecular melting point by reducing the size of the perylene imide discotic molecular core expansion.
Synthesis and Characterization of Novel Difuran-Coumarin Discoid Molecules
Authors: Wu Xianyao , Yv Zhen , Wang Wenguang , Zhu Lei , Li Zhongxiao 
Published: March 2022

Abstract
Two new types of novel difuran-coumarin discoid molecule substituted with long-chain alkyl groups were designed and synthesized, which furan-group was successfully coupled with coumarin as the starting material. In this paper, the synthesis method of the peripheral halogenation of novel difuran-coumarin discoid molecules was studied, and its solubility was improved through modification of its periphery, which makes them have high solution processability. And it can expectedly be used as one candidate of organic semiconductor materials.
A 3D Modulation Scheme for High-speed Baseband Digital Communication System
Authors: Feng Yeqing , Lai Zhengrong , Zhu Fusheng , Hu Zemin 
Published: March 2022

Abstract
To improve the transmission rate of wireless communications, the communication frequency band will gradually go higher, and the use of millimeter wave and terahertz will become mainstream in the future. However, the signal attenuation in high bands is considerable, which prevents the achievement of long-distance transmissions. In this paper, we propose a 3D modulation scheme that is especially suitable for high-speed baseband digital communication systems. The proposed scheme is simulated and tested in an experiment. With the same order of modulation, the 3D modulation shows a significant decrement in bit error rate and enables a longer transmission distance.
Research on DC voltage droop strategy based on optimal DC power flow
Authors: Dong J , Wang Z , Yan S , Wang Z , Jiang B , Zhu C , Wang C 
Published: March 2022

Abstract
A coordinated control based on the optimal DC power flow for MTDC is proposed to improve the transmission efficiency of multi-terminal HVDC, which adopts hierarchical structure including processing layer and implementation layer. The dcOPF model of optimal DC power flow is established in the solving layer. The minimum of the generation cost is set as the objective function, and the constraints include the line capacity, generator capacity, converter station capacity and power balance. The optimal solution is applied to the executing layer. When disturbs occur in some converter stations, new optimal solution will be re–calculated and updated to the executing layer and reduce the generation cost. The stability of the system will not be affected by communication fault. A four-terminal VSC-MTDC simulation model in the MATLAB/Simulink platform is built in the paper. The simulation results show that the proposed control strategy can minimize the generation cost and the control strategy has the advantages of simple structure and easy implementation.
Research on dynamic aerodynamic performance of wind turbine airfoil under large blade deformation
Authors: Zhao Tiantian , Sun Haitao 
Published: March 2022

Abstract
With the increase of wind power blades, the amount of blade design pre-bending and deformation in motion has increased significantly. Under the condition of large deformation of the wind turbine blade, the pitch axis deviates greatly from the centerline of the airfoil. At this point, the pitch movement of the wind turbine blade will lead to the dynamic change of the airfoil angle of attack and the horizontal movement of the airfoil at the same time. Concerning this problem, the dynamic stall characteristic of the S809 airfoil under the condition of large deformation was studied using CFD technology. The results show that the horizontal motion caused by the deviation of the pitch axis from the airfoil center can significantly change the stall characteristic of the airfoil. Based on this, the fatigue load changes caused by changes in dynamic stall characteristics under typical operating conditions are studied.
Modal Investigation in Space Truss Deployable Antenna
Authors: Fang Yonggang , Zheng Shinkun , Dong Longlei , Xue Yonggang , Zhou Jiaming 
Published: March 2022

Abstract
Due to the large size, low frequency, and poor transmission of the space truss deployable antenna (STDA), it is not easy to perform experimental modal analysis (EMA) using hammers or exciters. In this paper, the operational methods ensure that both the low-frequency and high-frequency modes of the STDA are excited. A parameter estimation method called PolyMAX is employed to identify modal shapes, modal frequencies and modal damping of the STDA only using dynamic responses. Further, a gravity unloading system is used to simulate the microgravity environment of the STDA in space, and the dynamic responses in this state are collected and processed. Finally, we discuss the difference of STDA modal parameters under the gravity and microgravity conditions through the previous test results. The technology used in this study can be further applied to the similar STDA structures.
The Seismic Response of a Lined Tunnel under Plane P-wave in a Slope Site
Authors: Luo Yan-ping , Feng Quan , Zhou Tao , Liu Tao , Xiao Zheng-yong , Wang Sheng 
Published: March 2022

Abstract
The indirect boundary element method (IBEM) is adopted to solve the 2D scattering problem of circular underground lining tunnels near canyons and slopes to the P-wave. The numerical results show that the canyon and slope topography near the underground lining tunnel has an evident influence on the surface displacement. The horizontal displacement amplification reaches nearly two times. The presence of slopes has a shielding effect on the nearby underground tunnels. The stress concentration exists at the top and bottom of the arch of the lining tunnel. The dynamic interaction between the slope and the tunnel should be considered when building a tunnel close to the slope.
Dynamic behavior of PMMA under planar shock conditions
Authors: Li Jin , Li Yun-liang , Zhang Xiang-rong , Zhu Yu-rong , Tan Shu-shun , Zhang Guan-jun 
Published: March 2022

Abstract
As a non-metallic low wave impedance material, PMMA has been widely used in experiments of blast and shock. But the dynamic performances of different kinds of PMMA vary greatly. In this paper, the plane shock-wave experiments were performed with a 57 mm bore single-stage light gas gun in order to determine the dynamic behavior of PMMA at stress levels between 0.4 and 3.8 GPa. The particle velocity and shock wave velocity were measured with electromagnetic particle velocity sensors embedded into the samples directly, and the velocity of the flyer was measured with a laser velocity measuring system. The typical wave forms of particle velocity and the Hugoniot data of the experiments were presented in this paper. The dynamic stress–strain relations of experiments at different pressure ranges were obtained by the Lagrangian analysis method based on one dimensional strain, and the loading and unloading characteristics of which were discussed.
Influence of angle-of-attack on drag force
Authors: Ma AIXIANG , Zhou SHIJIN , Wu QIAN , Zhu CHUANLEI 
Published: March 2022

Abstract
During the airdrop process, when the incoming flow flows through the parachute system at a certain angle of attack, it will affect the deceleration performance of the parachute system. This work studied the influence of angle-of-attack on the drag force of the parachute system. The elements of the “T- 11” parachute and “T- 11 reserve” parachute system were introduced. Numerical simulation was used to approach the real condition. The simulation results show that for a single canopy, the increase of angle-of-attack will cause the drag coefficient of the canopy to decrease; for the parachute system with load under the canopy, when the angle-of-attack is less than 20º, the increase of angle-of-attack will increase the drag coefficient of the canopy, and when the angle-of-attack continues to increase, the drag coefficient of the canopy will gradually decrease. In these simulations, the deformation of the parachute is not concerned.
Research on the collapse of Tacoma narrows bridge under the finite element application ANSYS of computational mechanics
Authors: Lin Yichang , Xie Xizhe , Yan Lingan , Zhou Yifan 
Published: March 2022

Abstract
Compared with the collapse of the Tacoma Bridge in 1940, other bridges constructed around the same period remain functional. This research objective is to compare Tacoma Bridge and George Washington Bridge to determine the critical factors of collapsing behavior. In order to accomplish the goal, two bridge models are constructed for analysis and comparison. The finite difference method is applied to modeling in this process. From the modal analysis in ANSYS, the data of total deformation of Tacoma bridge is much higher than that of George Washington Bridge. Therefore, four factors are combined to demonstrate the collapse of Tacoma. This 1940s event is regarded as having landmark meaning and provide relative experience in the modern bridge constructions.
Electrowetting Characteristics of an Insulating Droplet under Coplanar Electrode
Authors: He Yijia , Zhao Rui , Zhang Yue , Liang Zhongcheng , Kong Meimei , Chen Tao 
Published: March 2022

Abstract
Electrowetting on dielectric (EWOD) has become an effective droplet manipulation method in microfluidic technology. In this paper, a theoretical model based on energy conversation is established to depict the electrowetting behavior of an insulating droplet located on a coplanar electrode in conductive liquid. To validate the correctness of the theory, COMSOL is carried out to simulate wettability evolution of the silicone oil droplet surrounded by propylene glycol (PG) containing with 1 wt% tetrabutylammonium chloride (TBAC). Relative experiments are conducted to detect the contact angle (CA) and height (H) of the insulating droplet at different voltage. When the voltage is increased, the wettability of the conductive liquid changes and consequently the insulating droplet is squeezed inward. The silicon oil droplet in PG exerts continuous change in CA and H by operation of voltage adjustment. When the voltage is increased to 110V, the CA changes from 42.5° to 134°, and the relative H reaches up to 3.46 mm. The results show that theoretical model is basically consistent with the facts.
Seismic performance of buckling-restrained braced steel frames subjected to earthquake main shock-aftershock sequences
Authors: Gong Chao , Jia MingMing , Cheng XuanHao , Gritcuk Mishel 
Published: March 2022

Abstract
Recently, there are many papers report the development of some new buckling-restrained braced (BRB) frames and the evaluation of its characteristics. At the same time self-centering buckling-restrained braced (SCBRB) frames are considered as new solutions for the increasing of the structural resilience. In this thesis, the seismic performance of structures is analyzed subjected to earthquake main shock-aftershock sequences. There is comparison of two types of the additional BRB elements, and also there is comparison between them and original steel frame to show the effect of using BRB and SCBRB elements. To compare the seismic performance of BRBF and SCBRBF, the same main shock-aftershock sequences were used in this part. Because of the flag-shaped hysteretic curve of the SCBRB elements, big amount of the energy was dissipated during the motion. Compared to steel frame, smaller seismic responses and residual deformation occurred the structure. BRBF and SCBRBF can control the seismic responses effectively due to the energy dissipation of BRB, and SCBRB can also reduce the structural residual deformation. The earthquake aftershock after earthquake main shock can increase the structural damage and enlarge the structural seismic responses.
Fabrication and electron transport characteristics of suspended Graphene/hBN heterostructure Devices
Authors: Cui Ziru , Bai Zongqi , Luo Fang , Zhu Mengjian 
Published: March 2022

Abstract
Graphene has outstanding electrical properties such as high carrier mobility and large operation current density due to it’s unique two-dimensional carbon honeycomb lattice structure. However, the carrier mobility and on/off ratio in current of traditional silicon-integrated graphene devices are largely limited due to the substrate-induced scattering effect. Exploring new device structure to prepare graphene devices is an important way to improve their performance. In this work, we propose a new fabricate technique for suspended Graphene/hBN van der Waals heterostructure device with high vield. Combined with improved transfer technology, it greatly improves the probability of successful suspending graphene devices, and we found that the Dirac point of the suspended graphene device is located in nearly zero gate voltage, which reduced the doping in graphene effectively, and further proved the advantages of our device structure in fabricating suspended devices.
Research on sealing performance of special thread of tubing under complex load
Authors: Wang Chuanlei , Liu Xiangkang , Wang Hao , Li Yufei , Zhang Lin , Wang Han 
Published: March 2022

Abstract
In order to study the performance of a special threaded joint of a tubing under severe well conditions, a two-dimensional finite element model of this joint was established in the finite element software, and the mechanical properties and sealing performance of the special threaded joint under different working conditions were analyzed and studied. The results of the study indicate: under different make-up torques, the Mises stress value on the thread has a small difference, and there is a significant difference at the shoulder. When subjected to complex loads, the Mises stress on the load-bearing surface of the thread head and tail ends is high, the overall maximum Mises stress exceeds the yield limit of the material, but the stress level in most areas is low, there is no plastic penetration part and structural damage on the thread teeth. The sealing index of the threaded joint is greater than the critical sealing performance index. This shows that this threaded joint can meet the requirements of use.
Analytical investigation on the mechanical behavior of expansive soils: a simplified constitutive model
Authors: Xu Jianhua , Li Kai , Liu Mengmeng 
Published: March 2022

Abstract
Taking into account the high cost of damage to structures caused by uneven ground movements associated with expansive soils, the mechanical behavior of these materials is critically important to be studied theoretically and experimentally. A simplified constitutive model is proposed based on a 1-D mechanical design containing a parallel connection of the linear spring and the dashpot element, and its mathematical formation is presented in terms of the physical mechanism. The procedure of model parameters is introduced using cyclic suction-controlled tests by an expansive soil in France and a silt-bentonite mixture. The comparison between model simulations and tests is accomplished and this comparison explains that the simplified constitutive framework can describe basic features of expansive soils under wetting and drying cycles.
A beam dynamics study for efficient extraction from the VECC K500 superconducting cyclotron
Authors: Paul S. , Bhunia U. , Debnath J. , Dey M.K. , Bandyopadhyay A. , Som S. 
Published: March 2022

Abstract
Beam extraction from the K500 superconducting
cyclotron is very challenging due to its long extraction path of
about 330° with very high magnetic field gradient and low
acceptance. The initial attempts of beam extraction showed that the
pilot beams could successfully clear only a few magnetic
channels. To investigate the causes of the beam loss, magnetic field
measurements in different zones of the cyclotron were repeated. The
total field has been generated by superposition of the measured
field and the numerically computed field of the extraction
elements. Based on these data, extensive beam dynamics simulation
has been carried and beam distribution at the entry of the
extraction path obtained by accelerated orbit calculations. The
energy spread due to multi-turn deflector entry has been included in
the simulation. The beam envelope along the extraction path as well
as the beam transmission efficiency has been determined for
different positions of the extraction elements. The radial positions
of the extraction elements have been optimized parametrically to
compute the maximum transmission efficiency. The present studies
have enabled us to successfully extract the pilot beam (N4+)
from the cyclotron with beam current of around 20 enA.
Towards a transformational eco-metabolistic bio-based design framework in architecture
Authors: Thomsen Mette Ramsgaard , Tamke Martin 
Published: March 2022

AbstractThis paper discusses the foundations of a bio-based material paradigm for architecture. It argues that moving from a current reliance on the non-renewable materials of the geosphere, to the renewable and fundamentally cyclical materials of the biosphere can establish alternate foundations for thinking alternative sustainable building practices. By positioning architecture and the built environment as a particular case for bio-based materials, where the longer life spans of buildings support better carbon storage, this paper identifies the bottlenecks that limit their adaptation into the way architecture is thought, designed and built. If architectural ideation and design is traditionally understood through the durable and the permanent, our aim here is to challenge this foundation and bring forth the fundamental differences that bio-based materials engender. With focus on the embedded lifespans of living materials, the fundamental circularity and degradability of biomass and resulting transformative life cycles of the artefacts that they embody, this paper asks how a new representational framework for bio-based material paradigm can be conceptualised, instrumentalised and in turn materialised. The paper supports this positioning through a presentation of a series of methodological probes. The probes outline strategies for new methodologies by which we can capture, predict and steer the transformations of living materials and functionalise them as part of an architectural performance.
Quantum and braided ZX calculus*
Authors: Majid Shahn 
Published: March 2022

Abstract
We apply quantum group methods to quantum computing, starting with the notion of interacting Frobenius Hopf algebras for ZX calculus with noncommutative algebra and noncocommutative coalgebra. We introduce the notion of *-structures in ZX calculus at this algebraic level and construct examples based on the quantum group u

q
(sl
2) at a root of unity. We provide an abstract formulation of the Hadamard gate related to Hopf algebra self-duality. We then solve the problem of extending the notion of interacting Hopf algebras and ZX calculus to take place in a braided tensor category. In the ribbon case, the Hadamard gate coming from braided self-duality obeys a modular identity. We give the example of b

q
(sl
2), the self-dual braided version of u

q
(sl
2).
Noisy monitored quantum dynamics of ergodic multi-qubit systems
Authors: Schomerus Henning 
Published: March 2022

AbstractI employ random-matrix methods to set up and solve statistical models of noisy nonunitary dynamics that appear in the context of monitored quantum systems. The models cover a range of scenarios combining random dynamics and measurements of variable strength of one or several qubits. The combined dynamics drive the system into states whose statistics reflect the competition of randomizing unitary evolution and the measurement-induced backaction collapsing the state. These effects are mediated by entanglement, as I describe in detail by analytical results. For the paradigmatic case of monitoring via a single designated qubit, this reveals a simple statistical mechanism, in which the monitoring conditions the state of the monitored qubit, which then imposes statistical constraints on the remaining quantities of the system. For the case of monitoring several qubits with prescribed strength, the developed formalism allows one to set up the statistical description and solve it numerically. Finally, I also compare the analytical results to the monitored dynamics of a quantum kicked top, revealing two regimes where the statistical model either describes the full stationary dynamics, or resolves time scales during particular parts of the evolution.