bluuebunny/crossref_metadata_2025_split huggingface dataset:
Cow–calf efficiency of beef cows grazing different herbage allowances of rangelands: hepatic mechanisms related to energy efficiency
Authors: Casal Alberto , Garcia-Roche Mercedes , Cassina Adriana , Soca Pablo , Carriquiry Mariana 
Published: February 2022

Context Improvement in efficiency of energy utilisation of cow–calf systems could benefit beef production profitability and sustainability. Energy efficiency has been associated with mitochondrial function; therefore, hepatic mitochondrial function and oxidative stress could play a key role in energy efficiency of beef cows. Aim We evaluated the effect of two herbage allowances from rangelands (Campos biome) on cow–calf energy efficiency, hepatic mitochondrial density and function, and oxidative stress of purebred (Hereford and Aberdeen Angus) and reciprocal F1 crossbred beef cows. Methods Mature cows (n = 32) were used in a complete randomised block design with a factorial arrangement of herbage allowance (2.5 vs 4 kg dry matter/day; low vs high) and cow genotype (pure vs crossbred) over 3 years. At the end of the third year, cows were slaughtered at 190 ± 10 days postpartum. Liver was dissected and weighed, and samples were collected and snap-frozen pending analysis of mitochondrial density and oxidative stress markers. Estimated cow–calf energy efficiency was calculated by using total cow estimated metabolisable energy intake as input and calf energy retained at weaning as output. Key results Cow–calf energy efficiency was greater (P ≤ 0.07) for high than low herbage allowance and for crossbred than purebred cows. Mitochondrial density biomarkers (hepatic citrate synthase enzyme activity, citrate synthase mRNA, and mitochondrial:nuclear DNA ratio) were greater (P ≤ 0.03) for high than low herbage allowance. Plasma pro-oxidants and plasma antioxidant capacity were greater (P ≤ 0.07) for crossbred than purebred cows. Plasma oxidative stress index and expression of hepatic 4-hydroxynonenal protein adducts were affected (P ≤ 0.06) by herbage allowance × cow genotype interaction. Conclusion Greater cow–calf energy efficiency was associated with greater hepatic mitochondrial density without differences in mitochondrial function. Contrary to expectation, greater efficiency of crossbred than purebred cows was associated with increased hepatic oxidative damage, which probably reflects greater liver metabolic activity in crossbreds. Implications Herbage allowance and cow genotype affect cow–calf efficiency, hepatic mitochondrial function and oxidative stress markers. Greater efficiency of crossbred cows seems associated with increased hepatic oxidative damage.
Changes in leaf ecophysiological traits and proteome profile provide new insights into variability of salt response in the succulent halophyte
Authors: Belghith Ikram , Senkler Jennifer , Abdelly Chedly , Braun Hans-Peter , Debez Ahmed 
Published: February 2022

Natural variability of stress tolerance in halophytic plants is of significance both ecologically and in view of identifying molecular traits for salt tolerance in plants. Using ecophysiological and proteomic analyses, we address these phenomena in two Tunisian accessions of the oilseed halophyte, Cakile maritima Scop., thriving on arid and semi-arid Mediterranean bioclimatic stages (Djerba and Raoued, respectively), with a special emphasis on the leaves. Changes in biomass, photosynthetic gas exchange and pigment concentrations in C. maritima plants treated with three salinity levels (0, 100 and 300 mM NaCl) were monitored for 1 month. Comparative two-dimensional gel electrophoresis (2-DE) revealed 94 and 56 proteins of differential abundance in Raoued and Djerba accessions, respectively. These salinity-responsive proteins were mainly related to photosynthesis and oxidative phosphorylation (OXPHOS). Although Djerba accession showed a lower biomass productivity, it showed a slightly higher CO2 assimilation rate than Raoued accession when salt-treated. Photosynthesis impairment in both accessions under salinity was also suggested by the lower abundance of proteins involved in Calvin cycle and electron transfer. A significant increase of protein spots involved in the OXPHOS system was found in Djerba accession, suggesting an increase in mitochondrial respiration for increased ATP production under saline conditions, whereas a lesser pronounced trend was observed for Raoued accession. The latter showed in addition higher abundance of proteins involved in photorespiration. Salt-challenged plants of Djerba also likely developed mechanisms for scavenging ROS in leaves as shown by the increase in superoxide dismutase and thioredoxin, while an opposite trend was found in Raoued.
Nonlinear analysis of the internal resonance response of an L-shaped beam structure considering quadratic and cubic nonlinearity
Authors: Nie Xiaochun , Gao Xin , Wang Lingzhi , Tan Ting , Yan Zhitao , Yan Zhimiao , Liu Xinpeng 
Published: February 2022

Abstract
The nonlinear behaviors of the L-shaped beam structure based on 1:2 internal resonance are investigated. The governing equations considering quadratic and cubic nonlinearity of the L-shaped beam structure are verified by the transient dynamic analysis of the finite element model. The approximate analytical solution for this system is derived by the method of multiple scales, and verified by the numerical solution. The Jacobian matrix of the modulation equation is employed to determine the equilibrium stability of the vibration response. The effects of the excitation frequency, amplitude and cubic nonlinear terms on the nonlinear responses of the primary resonance of the first and second modes are discussed. The bifurcation diagram, spectrum, phase plane and Poincaré section are applied to investigate the nonlinear vibration response. The results reveal that many nonlinear phenomena are observed, such as double-jump, hysteresis, Hopf bifurcation, modal saturation, multiple solutions, multi-softening and so on. The influence of cubic nonlinear term on internal resonance response should be considered. The broadband characteristics of internal resonance system are broadened by the nonlinear softening and hardening in the frequency response curve. In the primary resonance of the second mode, the hardening region in the frequency response curve becomes the softening region with the increase of excitation amplitude. The double-jump phenomenon is found in this newly formed softening region, and up to five solutions are observed in this region, including three sink points and two saddle-nodes. The broadband characteristics of the system is of great benefit to the application of broadband piezoelectric vibration energy harvesting.
Thermodynamics of an Ising-like XXZ chain in a longitudinal magnetic field in the framework of the quantum transfer matrix approach
Authors: Bibikov P N 
Published: February 2022

Abstract
Taking the Ising chain as a reference model we have derived a perturbative expression for the free energy density of the Heisenberg–Ising chain with strong easy-axis anisotropy. All calculations are performed on the ground of the quantum transfer matrix approach. The obtained result agrees with the direct high-temperature expansion. It also agrees with the low-temperature cluster expansion in the special subregime when quantum fluctuations are weak against thermodynamical ones.
Extracting stochastic dynamical systems with α-stable Lévy noise from data
Authors: Li Yang , Lu Yubin , Xu Shengyuan , Duan Jinqiao 
Published: February 2022

Abstract
With the rapid increase of valuable observational, experimental and simulated data for complex systems, much efforts have been devoted to identifying governing laws underlying the evolution of these systems. Despite the wide applications of non-Gaussian fluctuations in numerous physical phenomena, the data-driven approaches to extract stochastic dynamical systems with (non-Gaussian) Lévy noise are relatively few so far. In this work, we propose a data-driven method to extract stochastic dynamical systems with α-stable Lévy noise from sample path data based on the properties of α-stable distributions. More specifically, we first estimate the Lévy jump measure and noise intensity via computing mean and variance of the amplitude of the increment of the sample paths. Then we approximate the drift coefficient by combining nonlocal Kramers–Moyal formulas with normalizing flows. Numerical experiments on one- and two-dimensional prototypical examples including simulated and real world measurement data illustrate the accuracy and effectiveness of our method. This approach will become an effective scientific tool in discovering stochastic governing laws of complex phenomena and understanding dynamical behaviors under non-Gaussian fluctuations.
Research on cooperative control strategy of multi-motor system based on fuzzy inference
Authors: Hu Tianqi , Tan Yuegang , Li Ruiya 
Published: February 2022

Abstract
General distributed multi-motor control system has a low synchronization performance and a poor coordination control accuracy. In order to improve the deficiencies, the fuzzy control method is used. Firstly, the fuzzy PID controller is designed to improve the control accuracy of a single motor in the control system; Then, aiming at the shortcomings of the traditional deviation coupling structure, an adjacent deviation coupling control strategy based on fuzzy inference and a speed compensator are designed to improve the synchronization performance of the whole control system. The simulation results show that the tracking error of single motor and the synchronization error between motors are greatly reduced.
A Dual-band Bandpass Filter with The Second Passband Independently Tunable
Authors: Yang Hong , Zhang Dewei , Zhang Yi , Bian Chenge , Sun Guanghui 
Published: February 2022

Abstract
This article proposes a dual-band bandpass filter (BPF) based on stub-loaded resonator (SLR) with the second passband independently tunable. Varactors loaded on the end of the central stub are employed to independently tune the second passband. Two shunt quarter-wavelength open stubs and source-load (S-L) coupling are applied to generate transmission zeros (TZs) to enhance the selectivity and improve the out-band rejection. For verification, a tunable dual-band BPF is designed, fabricated and tested, which realizes frequency tuning range (FTR) of the second passband from 2.24 to 2.71 GHz with constant fractional bandwidth (CFBW) of 1.5±0.4%. The simulated and measured results are in good accordance.
A low-noise and fast transient response LDO design for high-speed SerDes
Authors: Song Shengyu , Chen Jianjun , Yuan Hengzhou , Xing Haiyuan , Wen Yi 
Published: February 2022

Abstract
In order to deal with the special needs of high-speed digital-analog hybrid circuits for power supplies, this article has designed a LDO circuit specifically applied to high-speed SerDes. In the design process, a cross-coupled charge pump was used to increase the swing and reduce power supply noise, and to increase the gain and reduce the area overhead, the design of an asymmetric operational amplifier was introduced. At the same time, the use of the cascode structure is also conducive to the frequency stability of the loop and provides sufficient phase margin for the circuit. Through simulation verification, the low-frequency maximum internal noise of this LDO is only 0.96uV/sqrt(Hz), the transient response time when the load changes from low to high is 38ns, the transient response time from high to low is 84ns, the phase margin is 87.3deg, and the PSRR is 56.8dB.
Comparison between the Ultra-wide Band based indoor positioning technology and other technologies
Authors: Wu Pengtao 
Published: February 2022

Abstract
In recent decades, there have been many applications of positioning and navigation systems, the most representative of which is GPS (Global Positioning System). This technique is very accurate for outdoor navigation, but it cannot provide reliable positioning data indoors. This paper firstly compares the different indoor positioning technologies and analyses their bottleneck. Then the suitable algorithm of UWB based on indoor positioning technology (IPT) is discussed including Angle of arrival (AoA), Time of arrival (ToA), Time difference of arrival (TDoA), and Received Signal Strength (RSS). Eventually, the paper finds that although UWB-based indoor positioning technology still has many problems such as high deployment equipment costs to be solved, it is suitable for widespread applications due to its special advantages such as strong resistance to multipath effects.
Intelligent decision-making system for realizing the automatic control of Yangzhuang sluice based on the internet of things technology
Authors: Zhou Wei , Chen Sen , Zou WenHai , Yang Jing , Wu Meng 
Published: February 2022

Abstract
Yangzhuang sluice is located on the Gaoyou Lake control line of the Huaihe River into the Yangtze river and was built in May 1970. Due to the inherent insufficient design and historical reasons, Management Office has been using manual operation scheduling management of the sluice gate. The safety risks are large and the scheduling accuracy is not high. In order to further improve the comprehensive scheduling performance of sluice andenhance the scientific level of scheduling management, establish automatic control system, automatic control to realize power distribution system and gate, meet the requirements of “unattended, less people on duty”, and build sluice management system based on the Internet of Things system, realize the automatic monitoring and management of sluice, which is also the development demand of modern water conservancy.
A design of high-Speed SMS4 cipher circuit
Authors: Wu Chenjie , Tang Ying , Wei Yi 
Published: February 2022

Abstract
SMS4 cipher algorithm is a commercial cipher independently developed by china. This paper proposes a circuit design of high-speed SMS4 cipher algorithm, which adopts two-dimensional expansion and key path optimization technology. The round key generation module runs synchronously with the encryption module, and the running round is constant, which can effectively resist the side channel attack. Using Xilinx artix-7 for synthesis, the results show that the design function is correct, and achieves the balance of computing speed and resource occupation.
Secure transmission strategy of multi UAV relays in jamming environment
Authors: Yang Lei , Gao Song , Liu ZiYue , He ZhuoJun 
Published: February 2022

Abstract
This paper studies a multi UAV relays communication system based on secure transmission strategy in jamming environment. In the multi UAV relays communication system with interference, we use the physical layer security technology based on the physical layer to maximize the minimum average rate by optimizing the flight trajectory and resource allocation of the signal source and UAV relays, and adjust the channel state information of the legal communication channel, so as to improve the communication performance of the legal channel. Since the optimization problem and constraints are nonconvex and cannot be solved directly, we decompose it into two sub optimization problems: interference optimization and strategy optimization, which are solved respectively. Finally, the joint optimal solution of the original optimization problem is obtained by alternating iterative optimization, the simulation results show that by jointly optimizing the transmission power and flight trajectory of signal source and UAV relays, the influence of interference source on wireless communication is reduced and safer communication is realized.
Balance Control of an Inverted Pendulum on a Quadruped Robot by Reinforcement Learning
Authors: Wu Shangyu , Lei Xianqing , Ye Linqi 
Published: February 2022

Abstract
When a quadruped robot crosses some uneven terrain, its stability is a very important consideration. In practical applications, it is often difficult for researchers to obtain accurate models of quadruped robot systems and need quadruped robots to complete high-stability tasks. Balancing an inverted pendulum on a quadruped robot is a good way to test their balancing ability, which is of great research and practical value. According to the nonlinear, uncertain, and strong coupling characteristics of the quadruped robot inverted pendulum system, this paper proposes a quadruped robot balancing inverted pendulum algorithm based on reinforcement learning, the Q-learning algorithm. The advantage of this algorithm is that it can learn effective balancing policy directly from experience, and it does not depend on the accurate model of the quadruped robot. It has the characteristics of high efficiency and flexibility. Through a lot of training, it can break through the performance limit brought by model error to traditional methods. In this paper, a comparative experiment of a set of balanced inverted pendulums of quadruped robots with different sizes is completed in the V-REP simulation software. The experimental results show that the algorithm can effectively improve the balance ability of quadruped robots, and it also shows that the algorithm has good adaptability.
Design and Dynamic Analysis of Cleaning Robot for Cement Silos
Authors: Yang Jingkang , Duan Mingde , Zhang Bo , Shi Huadong 
Published: February 2022

Abstract
Aiming at the mechanization and automation of cleaning the hardening on the wall of the cement silo, a silo cleaning robot is designed. The kinematics and dynamics mathematical models of the cleaning robot are established respectively. With the 12000mm diameter silo as the cleaning object, the dynamics model is constructed with virtual prototype. There is an analysis of the relationship between the angular velocity and angular acceleration of the mechanical arm, and the relationship between the thrust of the cylinder over time were analyzed. The results show that the calculation results of the mathematical model and the simulation model are close, the change trend is consistent, and the movement is stable and meets the design requirements, which verifies the correctness of the mathematical model. The research results provide a theoretical basis for the next step of control system design and strength analysis. This silo cleaning robot solution can be extended to the cleaning construction of other silos such as coal bunkers, granaries and ore silo.
Investigation on vibration of Centrifugal Pump by Bearing supported position
Authors: Sun Tao , Liu Songge , Yu Wanbo , Shi Zhenyi 
Published: February 2022

Abstract
Vibration is one of the main problems which should be considered seriously in designing and operating a marine centrifugal pump to decrease vibration for the reliability of equipment and safety of ship. The reduction for vibration also can provide a guarantee for enhancing concealment, which will be benefit for military ships with higher requirements for concealment to improve combat effectiveness. A numerical calculation model of whole centrifugal pump was established in this paper. The emphasis of this article is that influence of bearing supported position on vibration of centrifugal pump. And conclusion was obtained that vibration peak can be reduced through adjust supported position of bearing reasonably. The simulation results was proved by experiment which was carried out in the Shaking Table Test.
Effect of micro-arc oxidation coatings with different thickness on high cycle fatigue performance of Ti-6Al-4V titanium alloy
Authors: Ba Hongbo , Fu Yuzhu 
Published: February 2022

Abstract
Micro-arc oxidation (MAO) coatings with 2 μm, 5 μm and 10 μm in thickness were produced on Ti-6Al-4V titanium alloy by MAO treatment, and the effect of coating thickness on the high cycle fatigue property was investigated. The microscopies and phases of coatings were analyzed by scanning electron microscopy (SEM) and X-ray diffraction (XRD) techniques. The results indicated that the coatings were mainly composed of anatase TiO2. The MAO process generated micro pits at the substrate surface. The micro pits played a role of the notches, which induced the crack initiation during fatigue loading. The fatigue life of samples decreased with the increase of coating thickness. The micro pits were the main factor for the decrease of the fatigue life.
Compact-design, Modeling and Simulation of the Internal Permanent Magnet of Magnetically Guided Capsule Endoscope
Authors: Zhang Guanqing , Yin Ruixue , Wang Kemin , Zhang Wenjun 
Published: February 2022

Abstract
Miniaturization is a challenge for the magnetically guided capsule endoscope (MGCE), especially considering the multifunction of MGCE. This paper proposes a compact-design of internal permanent magnet (IPM), which contributes to the miniaturization of MGCE. The IPM is a complex of actuator and shell of the MGCE, which frees the occupation of conventional IPM. The IPM is for the first time designed with a streamline shape for good kinematics. A magnetic propulsion model of the proposed IPM is established and a magnetic propulsion simulation based on finite element (FE) and boundary element (BE) analysis for guaranteeing steady locomotion and navigation is conducted. The simulation is validated by comparison of the analytical model. At last, the locomotion modes and navigation of IPM are simulated based on the justified simulation. In conclusion, the compact-design of IPM can guarantee the locomotion and navigation of MGCE, and increase the available inner space of MGCE.
Experimental on the vortex induced motion suppression of floating spar-type wind turbine
Authors: Xiao Yanghong , Fu Chunli , Bai Xinlan , Li Lei 
Published: February 2022

Abstract
To investigate the suppression performance of the spar-type wind turbine vortex induced motion(VIM) with the addition of splitter plate, VIM model tests were carried out in a circulating water channel. Two different splitter plates width conditions were tested. In all the conditions, the cylinder was free to oscillate with one DOF. Results regarding response amplitudes and characteristic frequencies were presented and discussed. There was no obvious lock-in phenomenon on the vortex excitation motion of the cylinders with splitter plate, only some synchronization was observed. W/D=0.2 has better suppression performance than W/D=0.4 in vortex induced motion.
Research and Analysis Based on Three-dimensional Precision Inspection Process Planning Technology
Authors: Sun Ri , Bai Yuewei 
Published: February 2022

Abstract
Three-dimensional precision inspection has the characteristics of digitization, completeness, and timeliness. The manufacturing industry needs to research and improve the existing inspection process planning technology. Carried out research on the key technology of three-dimensional inspection process planning, including inspection information extraction, inspection point planning, path planning, etc., compared and analyzed the offline inspection technology represented by the coordinate measuring machine and the online inspection technology represented by the machining center. Studied and analyzed the system architecture, main functional modules of process planning software tools for these two types of inspections; finally, it looks forward to the future development trend.