bluuebunny/crossref_metadata_2025_split huggingface dataset:
Optical evidence of many-body effects in the zincblende Al

x

Ga

1−x

N alloy system
Authors: Baron Elias , Feneberg Martin , Goldhahn Rüdiger , Deppe Michael , Tacken Fabian , As Donat J 
Published: September 2020

Abstract
We present a quantitative description of the change in optical properties of zincblende aluminium-gallium-nitride thin films dependent on the free-carrier concentration due to band filling and renormalization effects. Free-electron concentrations above 1020 cm−3 in GaN are achieved by introducing germanium as a donor. Spectroscopic ellipsometry in the infrared and ultraviolet spectral range yields the dielectric function (DF). The plasmon contribution for the infrared part of the DF allows to determine the free-electron concentration all-optically. Furthermore, by utilizing the Kane model for the band structure of semiconductors near the Γ-point of the Brillouin zone as well as taking into account Burstein-Moss-shift and band-gap renormalization, measured transition energies are efficiently described.
Determining accurate hand positions in three-dimensional space using twin-axis electrogoniometer sensors
Authors: Zargaripour Elham , Fallah Ali , Maleki Ali , Naghibi Seyedeh Somayeh 
Published: September 2020

Abstract
Electrogoniometers are low price sensors which are easily attached to the body in any environment. Although electrogoniometer sensors are typically used for angular measurements, they can also be used to determine position. This study aimed to accurately determine hand position during the performance of five daily life activities using two electrogoniometer sensors to measure shoulder and elbow angles simultaneously. The measurement of joint angles involves some errors which are divided into intrinsic and extrinsic errors. These errors cause considerable inaccuracies in the estimated hand positions. To overcome this issue, the errors identified are compensated for in two phases, the angular phase and the positional phase, in which a polynomial function and an Elman neural network are used for error compensation, respectively. The derived hand trajectories and the decrease of the
root mean square error at every stage of the error compensation, along with the variance accounted for of the Elman networks for each task, show the effectiveness of the proposed method.
Numerical investigation of tensile response of notched bulk metallic glass composite specimens
Authors: Dutta Tanmay , Chauniyal Ashish , Singh I , Narasimhan R 
Published: September 2020

Abstract
In this work, plane strain finite element and atomistic simulations of tensile response of double edge notched bulk metallic glass composite (BMGC) samples are conducted. A special constitutive model is used to represent the response of the bulk metallic glass matrix along with J
2 flow theory of plasticity to characterize the crystalline dendrites in the former, while a CuZr based glass matrix containing single crystal Cu dendrites is modeled in the latter. It is found that the ratio of notch root radius to the distance between the notch tip and the nearest dendrite, R/l
1, is an important parameter that governs the plastic deformation behavior and possible failure mechanisms. Both finite element and atomistic analyses show that as R/l
1 increases from a small to moderate value, a transition occurs in plastic flow through multiple shear banding with deflection by dendrites to ligament necking. On further increase in the above notch acuity parameter, the deformation behavior again changes to multiple shear banding without much hindrance from dendrites. Specimens with moderately blunt notches (as characterized by the value of R/l
1) having high hardening elongated dendrites exhibit pronounced plastic deformation along the ligament resulting in necking. The influence of BMGC microstructure and hardening of dendrites is also investigated from the finite element analyses.
Lateral monolayer MoS2 homojunction devices prepared by nitrogen plasma doping
Authors: Lu Jingjing , Guo Zhenyu , Wang Wenzhao , Lu Jichang , Hu Yishuo , Wang Junhao , Xiao Yonghong , Wang Xiya , Wang Shibo , Zhou Yufei , Zeng Xiangbin 
Published: September 2020

Abstract
Monolayer MoS2 possesses good electron mobility, structural flexibility and a direct band gap, enabling it to be a promising candidate for flexible and wearable optoelectronic devices. In this article, the lateral monolayer MoS2 homojunctions were prepared by a nitrogen plasma selective doping technique. The monolayer MoS2 thin films were synthesized by chemical vapor deposition and characterized by photoluminescence, atom force microscope and Raman spectroscopy. The electronic and photoelectric properties of the lateral pn and npn homojunctions were discussed. The results showed that the rectifying ratio of the pn homojunction diode is ∼103. As a photodetector of pn homojunction, the optical responsivity is up to 48.5 A W−1, the external quantum efficiency is 11 301%, the detectivity is ∼109 Jones and the response time is 20 ms with the laser of 532 nm and the reverse bias voltage of 10 V. As a bipolar junction transistor of npn homojunction, the amplification coefficient reached ∼102. A controllable plasma doping technique, compatible with traditional CMOS process, is utilized to realize the monolayer MoS2 based pn and npn homojunctions, and it propels the potential applications of 2D materials in the electronic, optoelectronic devices and circuits.
Unlocking the potential of metal organic frameworks for synergized specific and areal capacitances via orientation regulation
Authors: Deng Ting , Shi Xiaoyuan , Zhang Wei , Wang Zizhun , Zheng Weitao 
Published: September 2020

Abstract
Metal organic frameworks (MOFs) with numerous potential pseudocapacitive sites are quite appealing to supercapacitors with high specific and areal capacitances. However, MOFs suffer from a low conductivity nature, resulting in a mediocre electrochemical performance. Herein, we propose a template-growth strategy of MOF to enhance both specific and areal capacitances of MOF as the electrode material for supercapacitor. As the loading mass of MOF increases from 2 to 5 mg, the specific capacitance also increases from 937 to 2387 Fg−1 (431 to 1098 Cg−1) and areal capacitance 1.87 to 11.94 Fcm−2 (0.86 to 5.49 Ccm−1). Accordingly, a hybrid MOF//AC supercapacitor can deliver a maximum energy density of 67 Wh kg−1 and a maximum power density of 6000 W kg−1. These results point to a way to fabricate MOF electrode of supercapacitor with high specific and areal capacitance, which leads them to a more practical future.
Ionization waves in the PK-4 direct current neon discharge
Authors: Hartmann Peter , Rosenberg Marlene , Juhasz Zoltan , Matthews Lorin S , Sanford Dustin L , Vermillion Katrina , Carmona-Reyes Jorge , Hyde Truell W 
Published: September 2020

Abstract
The PK-4 system is a micro-gravity dusty plasma experiment currently in operation on-board the International Space Station. The experiment utilizes a long DC discharge in neon or argon gases. We apply our 2D particle-in-cell with Monte Carlo collisions discharge simulation to compute local plasma parameters that serve as input data for future dust dynamics models. The simulation includes electrons, Ne+ ions, and Ne
m
metastable atoms in neon gas and their collisions at solid surfaces including secondary electron emission and glass wall charging. On the time scale of the on-board optical imaging, the positive column appears stable and homogeneous. On the other hand, our simulations show that on microsecond time scales the positive column is highly inhomogeneous: ionization waves with phase velocities in the range between 500 m s−1 and 1200 m s−1 dominate the structure. In these waves, the electric field and charged particle densities can reach amplitudes up to 10 times of their average value. Our experiments on ground-based PK-4 replica systems fully support the numerical findings. In the experiment, the direction of the DC current can be alternated, which has been found to favor dust particle chain formation. We discuss possible mechanisms for how the highly oscillatory plasma environment contributes to the dust particle chain formation.
Design, prototyping, and evaluation of a concept for a shape-changing smart material building surface tile
Authors: Zupan Robert J , Clifford Dale T , Beblo Richard V , Brigham John C 
Published: September 2020

Abstract
A design concept for shape-changing smart material tiles for applications in environmentally responsive building facades is presented. In particular, the application considered is a tile that would change the shape of the building surface to favorably affect the interaction with solar irradiance. A lab-scale prototype system for smart material tiles composed of 3D printed thermally responsive shape memory polymer (SMP) and utilizing localized thermal material activation and uniform pressure actuation is examined. Tests utilizing the prototype tile are used to create and validate a computational (finite element) representation of the adaptive surface tile system. Toward developing this computational representation, a strategy is presented to determine and validate the material parameters for the 3D printed SMP by matching the tile shape predicted by the numerical model to the tile shape measured experimentally. This numerical representation was then implemented into a computational approach to explore the design space for this adaptive tile to have an effect on the solar irradiance on a building surface. More specifically, a series of numerical examples are considered that determine the location and size of material activation that minimize the area of the tile exposed to solar irradiance. Results indicate that the adaptive tile can change the surface of a structure to considerably improve the structure’s interaction with solar irradiance. Additionally, the importance of the control strategy for a multi-tile system was displayed, particularly with respect to the capability to significantly reduce the energy cost and affect the solar irradiance to a higher degree by accounting for neighboring tile interaction.
Optimization study on magnetorheological fluid components and process parameters of cluster magnetorheological finishing with dynamic magnetic field for sapphire substrates
Authors: Pan Jisheng , Zheng Kun , Yan Qiusheng , Zhang Qixiang , Lu Jiabin 
Published: September 2020

Abstract
Sapphire is used as the base material of high-brightness LED devices, high-speed and high-frequency wireless communication devices, and solar photovoltaic conversion chips. Its surface quality determines the performance of the device. Magnetorheological (MR) finishing can avoid scratches and surface/subsurface damage caused by uneven abrasive particles due to the viscoelasticity of the polishing pad. When MR polishing was used to polish sapphire substrates, the adaptability of the MR fluid components and the rationality of polishing process was the key to quickly obtain high-quality workpiece surface. In this study, sapphire substrates were polished using cluster MR finishing with dynamic magnetic fields formed by multiple synchronous rotation magnetic poles. The components of the MR fluid were optimized by single-factor experiments, and the polishing process parameters were optimized through orthogonal experiment. The results showed that an ultra-smooth surface of Ra 0.27 nm could be obtained when sapphire substrate was polished 8 h by using the optimized MR fluid, which contained 120 nm silica sol with a mass fraction of 8 wt% and W3 carbonyl iron powders with a mass fraction of 16 wt%, also with the optimized process parameters as the machining gap, the workpiece speed, the magnetic pole speed and the rotation speed of the polishing disc were 1 mm, 350 r min−1, 45 r min−1 and 40 r min−1, respectively.
From the Jaynes–Cummings model to non-abelian gauge theories: a guided tour for the quantum engineer
Authors: Kasper Valentin , Juzeliūnas Gediminas , Lewenstein Maciej , Jendrzejewski Fred , Zohar Erez 
Published: September 2020

Abstract
The design of quantum many body systems, which have to fulfill an extensive number of constraints, appears as a formidable challenge within the field of quantum simulation. Lattice gauge theories are a particular important class of quantum systems with an extensive number of local constraints and play a central role in high energy physics, condensed matter and quantum information. Whereas recent experimental progress points towards the feasibility of large-scale quantum simulation of abelian gauge theories, the quantum simulation of non-abelian gauge theories appears still elusive. In this paper we present minimal non-abelian lattice gauge theories, whereby we introduce the necessary formalism in well-known abelian gauge theories, such as the Jaynes–Cumming model. In particular, we show that certain minimal non-abelian lattice gauge theories can be mapped to three or four level systems, for which the design of a quantum simulator is standard with current technologies. Further we give an upper bound for the Hilbert space dimension of a one dimensional SU(2) lattice gauge theory, and argue that the implementation with current digital quantum computer appears feasible.
Nonlocal vibrations and instability of three-dimensionally accelerated moving nanocables
Authors: Kiani Keivan , Efazati Mahdi 
Published: September 2020

Abstract
By considering the small-scale parameter, bilateral vibrations of a moving nanocable with three components of velocity and axial acceleration are investigated. The equations of motion associated with the transverse vibrations are derived using the Hamilton principle in the framework of Eringen’s elasticity theory. The newly developed governing equations are then solved for natural frequencies using Galerkin approximation and the exact methods for fixed-end conditions. To ensure the accuracy of the calculations, the results of the Galerkin method are compared with those of the method, and the capability of the Galerkin method in predicting the vibrational behavior is proved. The influence of the small-scale parameter, length, tensile force, and diameter on the mechanical behavior of the three-dimensionally moving nanostructure is investigated carefully. It is observed that by increasing the small-scale parameter and the diameter, the critical speeds and the fundamental frequency would lessen. Additionally, with increasing the tensile force and the axial acceleration, the lateral stiffness of the nanocable grows, leads to an increase of the critical speed as well as the fundamental frequency.
Bifurcation of Periodic Solutions and Its Maximum Number in a Circular Mesh Antenna System with 1:2 Internal Resonance
Authors: Jiang Lishuang , Li Jing , Zhang Wei 
Published: September 2020

Abstract
In this paper, we study the bifurcation of periodic solutions for a four-dimensional deployable circular mesh antenna system. The tools for proving these results are the averaging theory and Brouwer degree theory. Based on constructing displacement maps, we study the bifurcation of the periodic solutions of linear center, and to discuss the maximum number of periodic solutions in certain parameter control conditions. The results in this paper are helpful to the study of nonlinear dynamic characteristics and vibration control of deployable circular mesh antenna model.
Influences of Encapsulated HfO2 Film on the Performance of Graphene Filed Effect Transistors
Authors: Zhang Zhaohao , Wei Qianhui , Li Yudong , Zhang Qingzhu 
Published: September 2020

Abstract
Although the sensitivity of the traditional electrolyte-gated graphene FET is high, the graphene channel is easy to be polluted because of the direct contact between graphene and electrolyte, which leads to the poor stability of the device and not reusable. Ion sensitive field-effect transistors based on graphene (G-ISFET) with top dielectric layer could address the problems. However, deposing dielectric layer on graphene channel is a kind of doping process which debases the performance of G-ISFET. Therefore, the influences from the top dielectric layer in G-ISFET are important and should be studied. In this work, a bottom gate G-ISFET is designed and fabricated, which uses graphene as channel and insulating layer HfO2 as the protective film of graphene. Besides, through a series of electrical characterization, the influence of the deposited HfO2 top layer on graphene FET is analyzed, and the device’s characters as pH sensor is further explored.
Effect of Beam Oscillating Parameters on Laser Welding of Mg/Ti Joints
Authors: Dong Wen , Huang Rongrong , Zhao Hongyun , Tan Caiwang 
Published: September 2020

Abstract
Laser oscillating welding of AZ91 and Ti-6Al-4V was carried out and the influence of oscillating parameters on morphology and mechanical property was investigated. The joint strength obtained with beam oscillating was enhanced compared that without oscillating. With oscillating frequency increased, welding width of Mg improved while the melting amount of Ti decreased. The tensile strength improved initially and then decreased when oscillating frequency increased.
Structural Evolution of β’-In2Se3 under Pressure
Authors: Liang Juan , Jin Haolin , Zhang Jiang , Chen Xi 
Published: September 2020

Abstract
The structural evolution from β’ phase to β phase of the In2Se3 under high pressure is studied by X-ray diffraction (XRD) and Raman scattering. The XRD spectra show that the crystal transforms from β’ phase to β phase at 11.5 GPa, which is consistent with the previous studies. However, the red shift of Ag
4 Raman mode shifts at pressure ranging from 8.8 GPa up to 15.2 GPa which associates with the stretching In-Se bonds under high pressure. The result indicates that the change from low-symmetric phase to high-symmetric phase of the layered In2Se3.
Influencing Factors in Regional Income Gap in Guangdong
Authors: Xie Xiuzhen , Huang Hongwu 
Published: September 2020

Abstract
The widening income gap may lead to a “middle income trap”. As a province of economic strength in China, Guangdong’s widening regional income gap will have a negative impact on its economic development. By adopting a time series regression research method, this paper found that changes in educational human capital and traffic facility have a significant influence on the widening regional income gap. Therefore, it is suggested to narrow the regional income gap by increasing education expenditures, allocating education expenditures in various regions, as well as planning traffic routes rationally.
Simulation of Solidification Process of BGA Tin-Lead Solder ball Based on Cellular Automaton Method
Authors: Li Xiang , Gao Tianming , Guo Shuhan , Li Yang , Huo Shixing , Wang Hengrui , Li Shuai , Zhang Tao , Li Shu 
Published: September 2020

Abstract
A method based on cellular automata was established to simulate the solidification process of solder balls used in ball grid array (BGA) packaging technology. For the uniform and constant temperature distribution inside the droplets, the equiaxed crystal morphology and the equiaxed crystal solute field were studied. The simulation results are also shown for solidification process with the BGA tin-lead solder ball prepared by uniform droplet spray (UDS) process under the condition that the cooling rate of is invariable.
On Living Dam Planning for Earthquake Prevention and Disaster Reduction
Authors: Li Youfang , Zhao Shigang , Qin Xue , Li Dahua 
Published: September 2020

Abstract
Based on the comprehensive research on the technology of “geographical name code”, “modern nonmetallic structure”, “high temperature fermentation biogas digester waste disposal power generation”, “Internet plus earthquake prevention and disaster mitigation APP” and “new theory of securities public investment”, this paper puts forward a new concept of “earthquake prevention and disaster reduction” in dam, which will obviously alleviate the shortage of farmland, cross river traffic, small hydro-power development in mountainous areas, and environmental protection waste. One belt, one road area, and the county level place code are proposed to lay the foundation for the new intelligent platform for earthquake emergency international earthquake preparedness and disaster reduction. The basic theory of securities public investment and its application in the PPP project for earthquake prevention and disaster mitigation are put forward, and the specific planning plan and budget for the construction of the dam in the poverty-stricken mountainous area are put forward. We will demonstrate the one to one belt, one road and one country. This paper is originated from practice and has a new idea, which will obviously promote the new development of human earthquake prevention and mitigation.
Facile Synthesis of Au Nanoparticles Supported on TiO2 Inverse Opals with Biosensor
Authors: Chen Zhe , Fu Ming , Wu Zheli , Li Caixia , Jiang Jingwen 
Published: September 2020

Abstract
In this paper, a three-dimensional porous structure of TiO2 inverse opals loaded the large area gold nanoparticles (AuNPs) was used as an advanced material for detection of L-cysteine and Avidin molecule concentrations. We think that functionalized gold nanoparticles combined with TiO2 inverse opals of low cost can couple out a characteristic reflection peak. After biomolecules were successively linked to the gold particles supported on TiO2 inverse opals, it is found that the peak position linearly red shifted with a change of avidin concentration. The lower limit of detection concentration can be up to 2x10−7M. This maybe provide a kind of biosensor for detecting biomolecules in the future.
Tebeigai Soil Conditioner Can Increase Eggplant Yield, Reduce Heavy Metal Content and Improve Soil Acidification
Authors: Huang Dongfeng , Luo Tao , Li Yu , Qiu Xiaoxuan 
Published: September 2020

Abstract
The acidification of farmland soil in the red soil region of South China has led to the decrease of agricultural products, quality and soil degradation, which is in urgent need of improvement. In this paper, a field trial was implemented to study the effect of applying different amount of Tebeigai soil conditioner (namely 750, 1125, 1500, 1875 and 2250 kg/ha) on eggplant’s yield, heavy metal content and basic physical and chemical properties of soil in red soil area. The results showed that: compared with the control treatment, the application of different doses of Tebeigai soil conditioner could increase eggplant yield by 15.5%~55.8%; reduce As content of eggplant fruit by 12.8%~51.8%, Cr content by 33.7%~57.1%, Pb content by 1.9%~19.2%, Cd content by 14.3%~30.4%; at the same time, the soil pH increased by 5.8%~18.6%, exchangeable acid (potential acid) decreased by 37.6%~82.3%; and the contents of available Pb, Cd and Cr were decreased by 7.0% ~ 21.6%, 15.1% ~ 29.6% and 1.0% ~ 21.4%, respectively.
Study on Fault Characteristics of Lower Cretaceous in Lishu Fault Depression of Songliao Basin
Authors: Qu Shaodong 
Published: September 2020

Abstract
As one of the most important geological structures, faults are widely developed in the crust, and the formation of faults is closely related to the regional stress field. The study of the fault characteristics can reflect the properties of the regional stress field in different periods. The regional stress field in Lishu fault depression, southeast uplift area of Songliao Basin is analyzed based on the statistical analysis and the study on the strike and length of the faults in different periods. The results illustrated that the Lishu fault depression went through three stages, the NW-SE extension in Huoshiling period, the left-lateral extrusion in Shahezi period, and the NW-SE extension in Yingcheng period, in which research the maximum value of regional stress field. With its special tectonic characteristics, Lishu fault depression reflects and records the tectonic regime and the main stages of innovation, transformation and evolution in geodynamic environment since the Mesozoic of northeast Asia tectonic domain.