bluuebunny/crossref_metadata_2025_split huggingface dataset:
Antiferromagnetic short-range order and cluster spin-glass state in diluted spinel ZnTiCoO4
Authors: Chowdhury Mouli Roy , Seehra Mohindar S , Pramanik Prativa , Ghosh Sayandeep , Sarkar Tapati , Weise Bruno , Thota Subhash 
Published: April 2022

Abstract
The nature of magnetism in the doubly-diluted spinel ZnTiCoO4 = (Zn2+)
A
[Ti4+Co2+]
B
O4 is reported here employing the temperature and magnetic field (H) dependence of dc susceptibility (χ), ac susceptibilities (χ′ and χ″), and heat capacity (C
p) measurements. Whereas antiferromagnetic (AFM) Néel temperature T
N = 13.9 K is determined from the peak in the ∂(χT)/∂T vs T plot, the fit of the relaxation time τ (determined from the peak in the χ″ vs T data at different frequencies) to the Power law: τ = τ
0 [(T − T
SG)/T
SG]−zν
yields the spin glass freezing temperature T
SG = 12.9 K, z
ν ∼ 11.75, and τ
0 ∼ 10−12 s. Since the magnitudes of τ
0 and z
ν depend on the magnitude of T
SG, a procedure is developed to find the optimum value of T
SG = 12.9 K. A similar procedure is used to determine the optimum T
0 = 10.9 K in the Vogel–Fulcher law: τ = τ
0 exp[E
a/k
B(T − T
0)] yielding E
a/k
B = 95 K, and τ
0 = 1.6 ×  10−13 s. It is argued that the comparatively large magnitude of the Mydosh parameter Ω = 0.026 and k
B
T
0/E
a = 0.115 (≪1) suggests cluster spin-glass state in ZnTiCoO4 below TSG. In the C
p vs T data from 1.9 K to 50 K, only a broad peak near 20 K is observed. This and absence of λ-type anomaly near T
N or T
SG combined with the reduced value of change in magnetic entropy from 50 K to 1.9 K suggests only short-range AFM ordering in the system, consistent with spin-glass state. The field dependence of T
SG shows slight departure (ϕ ∼ 4.0) from the non-mean-field Almeida–Thouless line T
SG(H) = T
SG(0) (1 − AH
2/ϕ
). Strong temperature dependence of magnetic viscosity S and coercivity H
C without exchange bias, both tending to zero on approach to T
SG from below, further support the spin-glass state which results from magnetic dilution driven by diamagnetic Zn2+ and Ti4+ ions leading to magnetic frustration. Magnetic phase diagram in the H–T plane is established using the high-field magnetization data M(H, T) for T < T
N which reveals rapid decrease of T
SG with increase in H whereas decrease in T
N with increase in H is weaker, typical of AFM systems. For T > T
N, the data of χ vs T are fit to the modified Curie–Weiss law, χ = χ
0 + C/(T + θ), with χ
0 = 3.2 × 10−4 emu mol−1 Oe−1 yielding θ = 4 K and C = 2.70 emu K mol−1 Oe−1. This magnitude of C yields effective magnetic moment = 4.65 μ
B for Co2+, characteristic of Co2+ ions with some contribution from spin–orbit coupling. Molecular field theory with effective spin S = 3/2 of Co2+ is used to determine the nearest-neighbor exchange constant J
1/k
B = 2.39 K AFM and next-nearest-neighbor exchange constant J
2/k
B = −0.66 K (ferromagnetic).
Flexible microstructured pressure sensors: design, fabrication and applications
Authors: Gao Yang , Xiao Ting , Li Qi , Chen Yang , Qiu Xunlin , Liu Jiawen , Bian Yuqing , Xuan Fuzhen 
Published: April 2022

AbstractIn recent years, flexible pressure sensors have caused widespread concern for their extensive applications in human activity and health monitoring, robotics and prosthesis, as well as human-machine interface. Flexible pressure sensors in these applications are required to have a high sensitivity, large detective limit, linear response, fast response time, and mechanical stability. The mechanisms of capacitive, piezoresistive, and piezoelectric pressure sensors and the strategies to improve their performance are introduced. Sensing layers with microstructures have shown capability to significantly improve the performances of pressure sensors. Various fabrication methods for these structures are reviewed in terms of their pros and cons. Besides, the interference caused by environmental stimuli and internal stress from different directions leads to the infidelity of the signal transmission. Therefore, the anti-interference ability of flexible pressure sensors is highly desired. Several potential applications for flexible pressure sensors are also briefly discussed. Last, we conclude the future challenges for facilely fabricating flexible pressure sensors with high performance and anti-interference ability.
Phosphine free synthesis of copper telluride nanocrystals in 1D and 2D shapes using Dipehylditelluride (DPDTe) as an air-stable source
Authors: Mishra Mohini , Patil Niraj Nitish , Zubair Maria , Kapuria Nilotpal , Lebedev Vasily , Adegoke Temilade Esther , Ryan Kevin M , Singh Shalini 
Published: April 2022

Abstract
In this paper, we have developed a ‘phosphine-free’ method for synthesising copper telluride nanocrystals using diphenyl ditelluride as an air-stable tellurium source. The diphenyl ditelluride is shown to have optimal reactivity for the colloidal synthesis of Cu2Te, allowing optimal control over the phase and morphology. Using this unexplored Te precursor for copper telluride synthesis, 1D nanorods of hexagonal phase (Cu2Te) were synthesised at a moderate temperature of 180 °C. The precise control over key parameters for this system results in Cu2−x
Te nanocrystals forming with varied shapes (1D nanorods and 2D nanoplates), sizes, and crystal phases (hexagonal Cu2Te and orthorhombic Cu1.43Te).
Visible-light responsive ZnSe-anchored mesoporous TiO2 heterostructures for boosted photocatalytic reduction of Cr(VI)
Authors: Alsheheri Soad Z , Shawky Ahmed , Alsaggaf Wejdan T , Zaki Z I 
Published: April 2022

Abstract
The accumulation of Cr(VI) ions in water can cause serious influences on the environment and human health. This work reports a humble synthesis of ZnSe nanoparticles anchored to the sol-gel prepared TiO2 for visible-light-driven photocatalytic reduction of Cr(VI) ions. The 7.9 nm ZnSe nanoparticles were attached to TiO2 surfaces at a content of 1.0−4.0 wt% as experiential by TEM investigation. The designed nanocomposite unveiled mesostructured surfaces exhibiting surface areas of 176−210 m2 g−1. The impregnation of ZnSe amended the visible-light absorption of TiO2 due to the bandgap decrease from 3.14 to 2.90 eV. The photocatalytic reduction of Cr(VI) applying the optimized portion of 3.0 wt% ZnSe/TiO2 was achieved at 177 μmol min−1. This photocatalytic activity is higher than the common Degussa P25 and pristine TiO2 by 20 and 30 times, respectively. The improved performance is signified by the efficient interfacial separation of charge carriers by the introduction of ZnSe. This innovative ZnSe/TiO2 has also shown photocatalytic stability for five consecutive runs.
Self-powered, low-noise and high-speed nanolayered MoSe2/p-GaN heterojunction photodetector from ultraviolet to near-infrared wavelengths
Authors: Sandhu Harmanpreet Kaur , John John Wellington , Jakhar Alka , Sharma Abhishek , Jain Alok , Das Samaresh 
Published: April 2022

Abstract
Integration of nanolayered metal chalcogenides with wide-bandgap semiconductors forming pn heterojunction leads to the way of high-performance photodetection. This work demonstrates the fabrication of a few nanometer thick Molybdenum diselenide (MoSe2)/Mg-doped Gallium Nitride (p-GaN) heterostructure for light detection purposes. The device exhibits low noise broadband spectral response from ultraviolet to near-infrared range (300–950 nm). The band-alignment and the charge transfer at the MoSe2/p-GaN interface promote self-powered photodetection with high photocurrent to dark current ratio of 2000 and 1000 at 365 nm and 640 nm, respectively. A high responsivity of 130 A W−1, detectivity of 4.8 × 1010 Jones, and low noise equivalent power of 18 fW/Hz1/2 at 365 nm is achieved at an applied bias of 1 V. Moreover, the transient measurements reveal a fast rise/fall time of 407/710 μsec for the fabricated device. These outcomes exemplify the viability of MoSe2/p-GaN heterostructure for high-speed and low-noise broadband photodetector applications.
Cumulants of the chiral order parameter at lower RHIC energies
Authors: Herold C , Limphirat A , Saikham P , Nahrgang M 
Published: April 2022

Abstract
We study cumulants of the chiral order parameter as function of beam energy as a possible signal for the presence of a critical end point and first-order phase transition in the QCD phase diagram. We model the expansion of a heavy-ion collision by a fluid dynamic expansion coupled to the explicit propagation of the chiral order parameter sigma via a Langevin equation. We evolve the medium until a parametrized freeze-out condition is met where we calculate event-by-event fluctuations and cumulants of sigma which are expected to follow the trend of net-proton number cumulants. We emphasize the role of a nonequilibrium first-order phase transition: The presence of an unstable phase causes the well-known bending of the trajectories in the space of temperature and baryochemical potential. For these cases at lower beam energies, the system crosses the freeze-out line more than once, allowing us to calculate a range of cumulants for each initial condition which are overall enhanced for the second hit of the freeze-out line. We thus find not only the critical end point but also the phase transition of the underlying model clearly reflected in the cumulants. The impact of volume fluctuations is demonstrated to play a measurable role for fluid dynamical evolutions that last significantly long.
Cosmic bounce with α(e
−β
G
− 1) + 2λ
T model
Authors: Yousaf Z , Bhatti M Z , Aman H 
Published: April 2022

Abstract
We consider a model of f(G, T) gravity to study the bouncing phenomenon of our universe with FLRW metric. We take f(G, T) = α(e
−β
G
− 1) + 2λ
T and develop field equations for a particular form of Hubble parameter. The explicit forms of energy density and pressure are formulated for a perfect cosmic fluid, that gives energy conditions and well explained the bouncing. The role of deceleration parameter, jerk, and snap are explored. The graphical demonstration is also done for these terms with fixed values of model parameters. Finally, we discuss a special form of f(G, T) gravity model that ensures the bouncing universe.
New method of exponential potentials reconstruction based on given scale factor in phantonical two-field models
Authors: Fomin I.V. , Chervon S.V. 
Published: April 2022

Abstract
We investigate two-field cosmological model with phantom and canonical fields (phantonical model as a generalisation of the quintom model for global universe evolution, including early inflationary stage). The model is represented as the chiral cosmological model with the target space conformal to 2D pseudo-Euclidean space. We found three sorts of exact solutions for a constant potential by direct integration
of dynamic equations and proposed new method of exact solution construction also extended for e-folds N-formalism for the case of non-constant exponential potential. We show that the exact solutions of cosmological dynamic equations can be obtained in explicit form for any type of scale factor evolution a(t) which implies the explicit inverse dependence t = t(a), considering the quasi de Sitter expansion of the universe with non-negligible kinetic energies of scalar fields and showing that the appeared effective cosmological constant can be considered as the source of second accelerated expansion of the universe. Further we analyze cosmological perturbations in the two-field model under consideration reducing it to the single field one. Such transition give us the way of cosmological parameters calculation and comparison them to observational data. We find that in proposed two-field cosmological model the isocurvature perturbations are negligible, and observable curvature perturbations are induced by adiabatic modes only. The series of phantonical models based on exact inflationary solutions are represented, and it is shown the correspondence to observational data for these models.
Research on Dynamics and Large Angle Attitude Robust Control Technology of “Dumbbell” Spacecraft
Authors: Ai Qingmu , Fan Hongwei , Wang Qian , Liu Dun , Li Shunli 
Published: April 2022

Abstract
In this work, the deployment state dynamics modeling and large angle attitude control of “dumbbell” spacecraft are studied. Firstly, based on the principle of multi-body dynamics, the rigid flexible coupling dynamic model is established by using Newton Euler method and finite element technology. Secondly, using Lagrange equations of the second type, the vibration equation is established. Furthermore, the unconstrained modal method is used to solve the unconstrained modal frequencies and formations. Finally, according to the large angle control requirements of “dumbbell” spacecraft, its stability is analyzed. A PD controller with robust term is designed to realize the large angle attitude control.
GA and RBFNN based PID for altitude-depth control of the multirotor Hybrid Aerial Underwater Vehicles
Authors: Zongcheng Ma , Xianyong Jing , Zhuoran Zhang , Shuchen Xiao , Tian Zhao , Guoshuai Li 
Published: April 2022

Abstract
Multirotor Hybrid aerial underwater vehicle (HAUV) is the vehicle which could operate both in air and underwater powered by multi-rotors. The water-air trans-domain process is very changeling for the change of the floatage and added mass and ‘ground effect’. This paper researched on the effect of the intelligent algorithms on the trans-media control. And the genetic algorithm (GA) based and radial basis function (RBFNN) based proportional-integral-derivative (PID) controllers are developed for the trans-domain process. Then simulations and conclusions are made for these two controllers. It shows that the GA based PID controller is suitable for the trans-domain process. The RBFNN based PID controller could even do better work with the repeated optimized PID parameters value of GA. But one must pay attention to that the RBFNN-PID is very sensitive with the initial PID values. The initial values of PID parameters must be repeated optimized with GA to guarantee the better effect of the RBFNN-PID.
Optimal Calculation Method for Buried Depth of Ground Anchor of Carrying Rope of Material Ropeway of Transmission Line
Authors: Chen Liu , Yongzhong Huang , Lianmao Li , Fei Wang , Huazhong Chen 
Published: April 2022

Abstract
The article adopts the soil weight method to propose an optimized calculation method for the buried depth of the ground anchor of carrying rope of material ropeway of transmission line, considering the shallow burial and deep burial situations. In the case of different soil types and conditions, the angle between the carrying rope and the horizontal ground, etc., a calculation process was designed to determine the minimum buried depth of ground anchor that meets the requirements of anti-pulling stability. The calculation result meets the construction safety requirements of ground anchor burying, and provides a calculation basis for the construction of ground anchor burying of carrying rope of material ropeway of transmission line.
The Application of Geodesic in Deployable Antenna Mesh Dividing
Authors: Duan Yu Zhu , Hu Fei , Zhang Lei , Li Yi Chen , Guan Yue Chao , Zhu Jia Long 
Published: April 2022

Abstract
Space deployable antennna has the characteristics of Lightweight, large diameter, high precision etc, which can meet the requirements of the launch vehicle carrying and payload’s Electromagnetic performance. Antenna’s mesh dividing have the direct bearing on payload’s Electromagnetic performance, geodesic mesh dividing has the advantage of shortest length of mseh line. but the equation solving of geodesic is complicated,which Impeding the geodesic’s application In academic and engineering fields. in this paper, a method has be proposed to solve the difficulty of geodesic equation solving. the solving result can be used in antenna’s mesh dividing, meanwhile the solving result can be used in Robot trajectory planning, Air route planning,Navigation route planning,Architectural structure design,etc. great care should be taken in constructing both.
Analysis of an Abnormal Faults of UHV DC Low-end YD-A Phase Converter Oil Chromatography
Authors: Zhou Xiu , Ma Bo , Liu Weifeng , Tian Tian , Luo Yan , Ma Yunlong , Wang Hehu 
Published: April 2022

Abstract
The article introduces an abnormal malfunction of YD-A converter oil chromatogram at the low end of UHVDC converter station, through oil chromatography data, ultrasonic positioning, on-site feeding, returning to plant disassembly and simulation calculation, which confirmed that the breakage of the isopotential of the converter electrostatic plate is the cause of the abnormal oil chromatogram and put forward corresponding suggestions and measures.
Design of Load Path-oriented BCCz Lattice Sandwich Structures
Authors: Zhao Shengjie , Zong Xinxiang , Wu Nan 
Published: April 2022

Abstract
Lattice structures are increasingly used in lightweight designs due to the advances of additive manufacturing. The overall performance of the lattice structures highly depends on the lattice cell arrangement. Previous studies show that body-centered cubic with z-axis reinforcement (BCCz) lattice has higher stiffness and strength compared to regular body-centered cubic (BCC) lattice subject to unidirectional compression. In this report, a load path-based methodology for the design of BCCz lattice sandwich structure with variable reinforcement directions is presented. A homogenization model of the sandwich structure with a specified volume fraction is developed first. Load path analysis is then conducted on the homogenization model to calculate the pointing stress vectors, which are lastly used to determine the orientations of BCCz cells. Based on the numerical simulations of a cantilever sandwich structure, the proposed lattice design has superior specific stiffness over the designs based on BCC or uniformly oriented BCCz unit cells.
Research on Axial Modification of Traction Gear
Authors: Shi Chunxiang , Xu Weipeng 
Published: April 2022

Abstract
When locomotive traction gear is meshed in transmission, unbalanced loading is easily formed due to various factors such as deformation and error. The research shows that axial modification can avoid this problem. In order to meet the design requirements of axial modification on different types of traction gear, the idea of parameterization can effectively reduce the development cycle. In this paper, on the premise of clarifying the structural form of locomotive driving device, the working characteristics of traction gear are introduced, the force analysis of motor shaft and axle is carried out in consideration of various aspects, the deflection deformation of each part is computed and superposed according to material mechanics, and the mathematical model of axial modification is established by combining the driving direction of motor comprehensively. The calculation model of load distribution is determined according to the actual error. Taking a certain type of locomotive traction gear as an example, the feasibility of the algorithm is verified by comparing the theoretical calculation value with the measured data and load distribution patterns before and after modification, and the results show that this method has guiding significance for axial modification.
Gunpowder Throwing Environment Simulation Test Method Research
Authors: Yang Bin , Sheng Dilun , Ni Debin , Fu Dongxiao , Chen Yilin , Hu Yahong 
Published: April 2022

Abstract
This method provides an initiating explosive device and charge of gunpowder scatters environment simulation device, the device instead of using real bomb throwing explosive gunpowder, the explosive subjected to high overload damage environment process, dramatically reducing the test cost. This device to throw environment adjustment is convenient, can be obtained by changing the shear plate thickness adjustment cast pressure; by changing the charge structure, regulation of projection velocity; test through the acquisition of the combustion chamber P - T curve and the dispersal velocity to evaluate the gunpowder scatter effect.
Design of linear steam distillation machine with arduino remote connection via messaging
Authors: Arizapana Renojo K K , Lazo Tapia W A , Sifuente Lopez J A 
Published: April 2022

Abstract
This study aims to design a piece of distillation equipment, with greater efficiency and extraction capacity. Currently, there are steam distillation machines, most of these equipment has the capacity to distill between 1 to 100 kilograms of material. In the present design, a linear vapor trace distillation is applied, with a capacity to distill 200 kilograms of schinus “molle” on the other hand, the equipment will have connection to a mobile phone through Arduino, from which it will be possible to make emergency stops. This research was obtained through calculations showing that 1.89 liters of essential oil can be extracted from every 200 kilograms of molle. Finally, it is concluded that the current still is theoretically more efficient, extracting much more oil than the other still. Also, it has the capacity to distill all those roots, stems, leaves, flowers, and seeds that have an essence.
Design and Analysis of Micron Chip Transformer
Authors: Wenyu Jiang , Yingjie Qu , Jin Meng , Hao Tang 
Published: April 2022

Abstract
With the rapid progress of power electronics high frequency conversion technology, the traditional magnetic components are more and more difficult to meet the requirements of modern electrical product design. In contrast, chip magnetic components have the advantages of small volume, low height and light weight in structure, small leakage inductance, low electromagnetic interference and high efficiency in electrical characteristics. They are very attractive in switching power supply with high frequency and high-power density. This paper studies the design and analysis of components, which has done useful work for the development of component magnetic design.
A TCAR method for common clock source single difference carrier phase observation ambiguity fixing
Authors: Xiao Ling , Si Changzhe , Ye Xin , Zhang Bangshuang , Qin Gang , Bai Yue 
Published: April 2022

Abstract
The ambiguity resolution is the key issue for global navigation satellite system (GNSS) high precision position. As the traditional three carrier ambiguity resolution (TCAR) method has shortcoming when solving the carrier ambiguity of single difference carrier phase measurement. A single difference carrier phase (SDCP) three carrier ambiguity resolution method was proposed by using the estimation of the relative position between two receiving antennas. It is illustrated by the test experiments that the success rate of SDCP ambiguity resolution with using the proposed algorithm is more than 98%; and the three-dimension(3D) position accuracy based on the ambiguity free SDCP measurements is about 58% higher than the position accuracy that using double differences carrier phase (DDCP) measurements.
A multipath migration method for common clock source SDCP observation using polynomial fitting technique
Authors: Xiao Ling , Si Changzhe , Ye Xin , Zhang Bangshuang , Qin Gang , Bai Yue 
Published: April 2022

Abstract
The multipath error is the major error source for high precision positions. One sidereal filtering multipath migration method is proposed for single difference carrier phase(SDCP) measurement based on polynomial fitting technique. The multipath error prediction is estimated by constructing a piecewise polynomial function based on polynomial fitting of one sidereal period multipath errors. Then the multipath error of the measurement is eliminated by subtracting the corresponding prediction. The effectiveness of the proposed method was verified by field experiments. The experimental results show that the 3-dimension (3D) accuracy of proposed method is improved by 68.9%, compared with the results that without multipath error eliminating.