bluuebunny/crossref_metadata_2025_split huggingface dataset:
High-precision tomography of ion qubits based on registration of fluorescent photons
Authors: Bogdanov Yu I , Dmitriev I A , Bantysh B I , Bogdanova N A , Lukichev V F 
Published: May 2023

Abstract
We develop a new method for high-precision tomography of ion qubit registers under conditions of limited distinguishability of logical states. It is not always possible to achieve low error rates during the readout of the quantum states of ion qubits due to the finite lifetime of excited levels, photon scattering, detector dark counts, low numerical aperture, etc. However, the model of fuzzy quantum measurements makes it possible to ensure precise tomography of quantum states. To do this, we developed a fuzzy measurement model based on counting the number of fluorescent photons. A statistically adequate algorithm for the reconstruction of quantum states of ion qubit registers based on fuzzy measurement operators is proposed. The algorithm uses the complete information available in the experiment and makes it possible to account for systematic measurement errors associated with the limited distinguishability of the logical states of ion qubits. We show that the developed model, although computationally more complex, contains significantly more information about the state of the qubit and provides a higher accuracy of state reconstruction compared to the model based on the threshold algorithm.
ZnO-NiO composite nanostructures produced by atmospheric PLD
Authors: Dikovska A , Avdeev G , Atanasova G , Dilova T , Nikov Ru , Nedyalkov N 
Published: May 2023

Abstract
In this study, ZnO-NiO binary metal oxides were synthesized by pulsed laser deposition regarding applications as gas sensors. The technology was applied in air at atmospheric pressure. A compound target fabricated by partially covering a ZnO pellet by a Ni slice was used for ablation. The structure, morphology, composition, and optical properties of the as deposited samples were studied. It was found that composites consisting of ZnO and NiO were formed during the ablation process in air. Generally, the morphology of the as deposited specimens represented a highly porous nanostructure. The samples’ microstructure indicated that the nanostructures were formed by spherically-shaped crystalline ZnO and NiO nanoparticles. The results demonstrated that the ZnO-NiO fabricated samples possessed a high surface-to-volume ratio with considerable number of components attributed to oxygen-deficient states and to adsorbed species, which makes them suitable for gas-sensing applications.
DIAL hygrometer based on powerful laser diodes: calibration function and modulation of laser radiation
Authors: Pencheva V , Penchev S , Dreischuh T 
Published: May 2023

Abstract
A differential absorption lidar method utilizing the spectral and energetic properties of high-power, pulsed laser diodes for remote sensing of atmospheric humidity is reported. The laser radiation of selected complementary laser diodes is multiplexed in dual spectral channels centered at optimal wavelength of 0.86µm and 0.911µm. Humidity profiles are retrieved integrating multiple resonance lines in the tunable range within the absorption spectrum of water vapor. The integral spectrum is less affected by the variable atmospheric pressure and temperature, which is an essential advantage allowing direct and reliable DIAL measurement.
Cyanocobalamin (vitamin B12) as insensitive porphyrinoid to solar LED irradiation
Authors: Mantareva Vanya , Iliev Ivan , Sulikovska Inna 
Published: May 2023

Abstract
Cobalamins are cobalt corrin complexes (vitamin B12) with typical porphyrinoid structure and absorption which partly overlaps with the solar spectrum of irradiation. This highly conjugated structure is assumed to have not only the well-known curative action as co-factor and vitamin, but also phototoxicity on dysfunctional, and, in a low extent, on normal cells. Moreover, the cobalamin can have properties as a photosensitizer at appropriate light conditions. The present study aims at characterization of the cyanocobalamin (CNCbl) as a synthetic cobalamin under solar-spectrum irradiation. The photo- and dark cytotoxicity studies were carried out on a normal cell line (BALB/c 3T3, A31) showing no effect due to light application. The photodynamic action of CNCbl due to its porphyrinoid-like structure was not observed. The results on two breast cancer cell lines (MDA-MB-231 and MCF-7) versus a non-tumorigenic cell line (MCF-10) showed similar values for cytotoxicity. A complete loss of viability was observed at approx. 10-4 M CNCbl after 24-hs incubation and soft irradiation (10 J/cm2) for the spectral range 360-960 nm of a LED Helios-iO solar simulator. The cobalt corrin complex showed non-photodynamic ability to reduce the viability of both breast tumor cells depending on the nature of the cell line but not on the light application.
Application of polymeric materials in free space optics for communications
Authors: Kasarova S N , Sultanova N G , Nikolov I D 
Published: May 2023

Abstract
Design of free space polymeric optics for communications is presented. Selection of polymers is accomplished on base of their measured transmission spectra, refractive and dispersive properties. The proposed telescopic system of the transmitter consists of a doublet objective composed of styrenic and acrylic materials and an eye-piece made of carbonate and acrylic polymers to minimise the spherical aberrations. The receiver optics is more precise and is realised as a high aperture Cassegrain objective to collect as much as possible of the incoming light and to couple it to the optical fiber.
Structural and mechanical properties of magnetron-sputtering-deposited Ta- and Al- based coatings – a comparative analysis
Authors: Donkov N , Zykova A , Safonov V , Dudin S , Yakovin S , Dimov D 
Published: May 2023

Abstract
A comprehensive evaluation of the structure and the nano-mechanical characteristics of single and two-layer nano-structured coatings AlN/Al2O3, TaN/Ta2O5 grown on the surface of metallic materials. The formation of a two-layer structure improves the mechanical and tribological properties of the coating-substrate system, such as the plastic deformation resistance and anti-wear performance. The results indicate that the proposed two-layer nanostructured nitride-oxide coatings based on aluminum and tantalum are promising candidates for biomedical applications.
Robust optimal allocation of multi-energy storage in a power-heating system based on operational risk
Authors: Du Chong , Qin Bin , Zhang Simin , Li Cao , Guo Chuangxin 
Published: May 2023

Abstract
In this study, a configuration model that accounts for operational risks is proposed for the combined power-heating system with energy storage. First, the thermal network storage is taken into account to create a model of the thermal network’s quasi-dynamic operation, and then the combined optimization with the power grid is taken into account to improve the collaborative electric-thermal modeling. Then, the value-at-risk parameter is introduced to make the difficult-to-determine uncertainty interval of new energy self-adaptive, thereby balancing economy and robustness. Finally, the Nested-C&CG algorithm is used to solve the two-stage robust problem with 0 - 1 integer variables in the lower layer. The case study’s findings demonstrate the value of the model and algorithm suggested in this research.
Study on fault waveform library of PT high voltage side fuse in hydropower station
Authors: Ren Hongtao , Zhang Ying 
Published: May 2023

Abstract
In the arc-suppression coil grounding system of a medium voltage distribution network, high voltage side voltage transformer insurance fusing faults frequently occur, including fusing during startup and grid connection, fusing during operation, fusing during the shutdown, etc., which will directly affect the accuracy of measurement, metering, protection, and other secondary equipment. In this paper, we used the calculation of electromagnetic transient EMTP-ATP software, theoretical analysis of the typical hydropower station wiring and parameters of the medium voltage system, set up the improved model of neutral point grounding system, simulation of single-phase earth fault line and disappeared in the transient process, calculation of PT transient current, to verify that the way to study the mechanism of frequent fusing of fuse in the PT. Typical fault waveform databases are established under different bad working conditions (ferromagnetic resonance, low-frequency nonlinear oscillation, lightning wave invasion, etc.).
Double resonance peak phenomenon and balance method of rotating machinery with flexible bearing support
Authors: Zhang Xiaobin , He Lei , Yin Hang , Ma Wenzuo , Si Paiyou 
Published: May 2023

Abstract
A simplified dynamic model of the rotor-bearing-support system is established considering the influence of pedestal flexibility. The vibration characteristics of the system with a flexible pedestal are analyzed. There are two resonance peaks during the run-up process for this kind of system. It is generally thought that the stiffness difference in the vertical and the horizontal direction is the main cause of the double resonance peak phenomenon. The results of the paper show that the flexible pedestal support also causes the double resonance peak phenomenon. The shaft relative vibration cannot reflect the influence of rotor unbalances well near the resonance zone. In this case, the bearing vibration should be preferred in the balance test. The vibration phenomenon on an actual unit is analyzed as an example.
Research on a Field Prompt Device for Substation Switch Remote Control Based on Station Control Layer Switch
Authors: Xiong Junfeng , Wu Linlin , Li Hao , Gao Shiqi , Chen Xiao , Li Tao 
Published: May 2023

Abstract
The switch in the substation is operated by remote control. To prevent the on-site personnel from being injured by the explosion of the fault switch, a prompt signal shall be sent to the on-site personnel to remind them to stay away from the operating equipment before the remote operation of the primary equipment is required from the perspective of safety. At present, the method of telephone notification or no notification is adopted, which is low in efficiency and poor in operability, and it is difficult to timely and effectively notify on-site personnel. The on-site prompt device for remote switch operation can send prompt signals to on-site personnel before remote switch operation without increasing any workload by monitoring the message of the station control layer switch, which can prevent personal injury and death caused by the explosion of remote switch operation and is of great significance to safety production.
Analysis of Fault of Wind Turbine in Offshore Wind Farm
Authors: Zhang Xiuqi , Yuan Shuai , Xin Donghao 
Published: May 2023

AbstractAccelerating advancement of a late-model electrical power system with new energy resources as the principal part is one of main measures to attain double-carbon goal. The international situation and policies have further promoted the rapid development of wind power. Because of massive reserves of wind energy resources in the sea area with its huge potential, development plan for wind power is gradually inclined to offshore wind power. In the article, offshore wind power’s advancement process and the typical topological structure of offshore wind farm access systems are described, the offshore wind farms’ problems existing in operation are classified and summarized, and the causes of the problems are analyzed from the perspective of wind turbine components or systems. And the directions worthy of further study are prospected, which can give support to the maintenance and overhaul for offshore wind turbines.
Experimental Study on Wind Noise Distribution Law of Transmission Lines
Authors: Shi Xin , Cui Xiangyu , Xie Lianke , Yin Jianguang , Li Lefeng , Zang Yuwei , Hou Xiaobang 
Published: May 2023

Abstract
Aiming at the problem of wind noise generated by transmission lines under windy weather conditions, this paper selects three groups of transmission lines in Shandong Province, China. Through the fixed-point measurement of the wind noise pressure of the conductor at the ground projection point of the side, phase conductor sags as the starting point, and the outward extension of 50 m as the endpoint, the frequency spectrum curve characteristics of the wind noise of the transmission line, the predominant frequency, the cut-off frequency, and the overall A sound level are analyzed. The results show that the transmission line conductor wind noise is mainly concentrated in the range of 500 - 2000 Hz, and its predominant frequency is around 650 Hz, which belongs to low-frequency noise. The wire wind noise attenuates with the increase of the distance from the projection point, and the attenuation is completed at 50m, and the wind noise fixed-point measurement decreases by 8 dB.
Research on diagnosis model of low-voltage distributed photovoltaic users increasing power generation without authorization
Authors: Shang Ying , Liu Xinran , Kang Liyan , Liao Liying , Cui He 
Published: May 2023

Abstract
With the promotion and popularization of national distributed photovoltaic projects, more and more residential users install distributed photovoltaic, which increases the income for residential users. However, for power companies, it is difficult to find out whether there are problems in the operation of photovoltaic equipment and whether users increase capacity privately during photovoltaic operation. Starting with the low-voltage distributed photovoltaic acquisition scheme, this paper establishes a low-voltage photovoltaic private capacity increase diagnosis model, so as to actively identify abnormal power generation and ensure the stability and safety of power grid operation.
Multi-layer Voltage Control Strategy for DC Microgrid without Communication
Authors: He Yuchao , Li Lirong , Qian Huimin , Yao Shenghong 
Published: May 2023

Abstract
This paper presented a multi-layer voltage control strategy for a stand-alone DC Microgrid. The unbalanced power of the system is compensated by the hybrid energy storage. The bus actual voltage is used as a message to implement the coordination of various terminals. By dividing the bus voltage, different voltage layers correspond to different working modes of each terminal of the system. The novelty of the presented control strategy is that the energy management performance of the DC Microgrid is improved, which is independent of the communication link. The DC Microgrid model is established in MATLAB/Simulink environment, and the simulation result shows that the presented strategy is feasible under different setting scenarios.
Voltage Optimization Control and Risk Assessment Technology for High-proportion Distributed Photovoltaic Access to Distribution Network
Authors: Xu Ke , Wang Yang , Li Zepeng , Li Xiaoqian , Song Honghe 
Published: May 2023

Abstract
The high proportion of distributed photovoltaic connected to the distribution network will lead to an increase in terminal voltage and network loss, which will not only generate many adverse effects on the safe and reliable operation of the distribution network but also easily lead to power supply disconnection and power supply interruption accidents caused by voltage out of limit. At present, the voltage control of the distribution network does not fully consider the regulation characteristics of the photovoltaic inverter itself and ignores the impact of different control methods on the distribution network security risk management and control. Therefore, this paper establishes a voltage closed-loop control model for high-proportion distributed photovoltaic access to the distribution network and proposes a real-time active voltage optimization control strategy with the goal of minimizing the deviation of the actual operation state of the distribution network from the scheduling plan. Finally, a typical industrial park is taken as a case for calculation and analysis. The results show that using real-time data to formulate a real-time voltage optimization control strategy can not only ensure the economic operation of each voltage regulating unit in the distribution network but also reduce operational risks. The control method proposed in this paper provides a new idea for improving the voltage control level of distributed photovoltaic access distribution network and fully guarantees the operation reliability of the entire distribution network.
A micro-force measurement torsion pendulum design with dual laser detection
Authors: Zhao Yujie , Wu Bojian , Jia Yuandong , Li Zongfeng 
Published: May 2023

Abstract
Aiming at the ground test and evaluation of the suspended test bench of the high microgravity scientific experiment cabinet in the Tianhe core module of the space station to obtain its exact thrust resolution, a micro-force measurement torsion device with dual laser detection is designed. The main configuration of the device is the suspension fiber torsion pendulum, and tungsten wire with a length of 400 mm and a diameter of 800 μm is used as the suspension fiber. Under micro thrust, the suspension fiber is twisted, which drives the mirrors at both ends of the scale arm to rotate along the suspension fiber. The displacement detection of the reflector is carried out, and the magnitude of the micro thrust is calculated in combination with the theorem of momentum. Experimental results indicate that the design of the torsion of micro-force measurement provides an effective test method for the ground test of the suspension test bench. The device can be used to measure and evaluate the micro-propulsion force of the air jet port. After replacing the tungsten fiber with a diameter of 1mm, it can also replace the air floating platform to carry out the air jet closed-loop control verification work, which can effectively and accurately complete the ground test and evaluation of the suspension test bench.
Semiconductor Bridge Temperature Change Study under Different Excitation Methods and Sizes
Authors: Huang Nianrong , Feng Feng , Duan Jianing , Tan Bingdong 
Published: May 2023

Abstract
The temperature of the semiconductor bridge increases due to the Joule heat effect in the way of capacitive discharge voltage excitation and current excitation, but the temperature distribution and the effect of different excitation methods and different sizes on the temperature change are not very clear; aiming at this problem, the temperature distribution of the semiconductor bridge after electrical energy excitation is simulated by finite element simulation. The effects of excitation mode and bridge area size on the temperature rise process of the bridge were studied by the control variable method; finally, the high-temperature area of the bridge body is only distributed in the bridge area, the temperature of the bridge body is positively correlated with electrical energy but negatively correlated with the area of the bridge area, and the current excitation method is better than the effect of voltage excitation. In addition, the conclusion is that the appropriate increase in excitation energy and the reduction of bridge size can help the temperature rise to improve the efficiency of the semiconductor bridge in practical applications.
Structure design and analysis of upper limb wearable passive power-assisted exoskeleton robot
Authors: Ning Yeyan , Li Yunji , Zhang Zhenyu , Liu Kaixuan , Liu Jianwen , Cai Jun , Wang Chunlei 
Published: May 2023

Abstract
The upper limb exoskeleton robot has been a key research direction at home and abroad in recent years. Still, the existing upper limb exoskeleton robot has poor coupling with the human body, and the power assistance effect could be better. In this paper, the strength of each muscle group of the upper limb when the human body is carrying objects is measured as reflected by the surface EMG signal of the human body, and the human kinematics is analyzed to guide the design of the passive exoskeleton robot of the upper limb. First, the spring tension and compression system model is established for the upper limb of the human body. The model is statically analyzed, the forces and moments on each joint are calculated, and each muscle’s actual output data when carrying objects is estimated. Based on the muscle kinematics model, a passive upper limb exoskeleton robot is designed. The robot is divided into three modules, namely, the arm module, shoulder module, and back module, using ergonomics and modular design ideas. The energy storage module and joint degree of freedom of the exoskeleton are analyzed to ensure that the exoskeleton meets the requirements of ergonomics, and the key components are checked and simulated. The results show that the designed upper limb wearable passive power-assisted exoskeleton robot meets the strength requirements, which verifies the rationality of the structure design.
Civil Aircraft Airworthiness Noise Measurement
Authors: Chen Ling , Li Qiang , Zhang Yizhi , Xu Liang 
Published: May 2023

Abstract
Civil aircraft noise is the main source of the airport and its surrounding areas, in recent years, with the continuous development of the air transport industry, aircraft noise has attracted more and more public attention, according to the International Civil Aviation Convention Annex 16 Volume I [1] and China Civil Aviation Regulations CCAR36 [2] Aircraft Type and Airworthiness Certification Noise Regulations. The noise limit requirements for transport aircraft are put forward. According to the requirements of the regulations, it is the key to determine that the aircraft meets the requirements of the regulations to obtain the noise data through flight tests and to obtain the equivalent perceived noise level through data processing. In the process of noise certification flight test, the noise measurement system should be arranged accurately in strict accordance with the requirements of airworthiness clauses, to accurately measure and record the noise and obtain the required data. In this paper, the noise airworthiness certification flight test of a certain type of civil aircraft is taken as an example, and the noise measurement system of civil aircraft is designed.
Research on automatic driving control strategy based on improved model predictive control
Authors: Chu Jianzhen , Zhang Qingyu , Wang Zengxi , Jia Tong 
Published: May 2023

Abstract
As a new technology direction in the automotive industry in recent years, automatic driving technology has played an important role in reducing traffic accidents, promoting energy conservation and emission reduction, and improving the efficiency of high-speed and urban roads. As one of the key technologies of autonomous vehicles, the performance of control algorithm greatly affects the smoothness of vehicle driving and the accuracy of track tracking. In order to consider the lateral control and longitudinal control accuracy at the same time, and ensure that the vehicle travels according to the given trajectory, this paper first establishes the vehicle kinematics model, and improves the traditional model predictive control algorithm, which realizes the high dynamic control of the desired trajectory while ensuring the vehicle stability and comfort. Finally, based on the built real vehicle test platform for automatic driving, the acceleration and deceleration test and the high-speed serpentine test are designed. By analyzing the test data, it can be seen that the control algorithm proposed in this paper can effectively achieve the vehicle trajectory tracking, and the control accuracy is improved.