bluuebunny/crossref_metadata_2025_split huggingface dataset:
106 New Emission-line Galaxies and 29 New Galactic H ii Regions are Identified with Spectra in the Unknown Data Set of LAMOST DR7
Authors: Lu Yan , Luo A-Li , Wang Li-Li , Wang You-Fen , Li Yin-Bi , Han Jin-Shu , Qin Li , Tang Yan-Ke , Qiu Bo , Zhang Shuo , Zhang Jian-Nan , Zhao Yong-Heng 
Published: April 2022

Abstract
This work is to retrieve emission-line spectra from the “Unknown” data set in LAMOST DR7 V1.2, most of which are low signal-to-noise ratios spectra. In the work, we perform emission line search and redshift calculations on the Unknown data set to get possible emission line galaxy spectra. Taking the galaxy spectra released by LAMOST as templates, the Product Quantization (PQ) based approximate nearest neighbor (ANN) search is used to retrieve the nearest neighbors of each spectrum. We keep the spectra for which the calculated redshift and the published redshift of the template meet the threshold, and 16,188 spectra with emission lines are obtained from the LAMOST DR7 Unknown data set. After visual inspection of spectra 10,266 spectra are left, in which 5828 spectra are identified as emission-line galaxies, 1782 spectra show ionization nebula features, and other 2656 are not clearly classified. Among 5828 spectra, 5720 can be found in Strasbourg astronomical Data Center catalog, Sloan Digital Sky Survey catalog, or NASA/IPAC Extragalactic Database catalog. The 108 spectra (corresponding to 106 unique coordinates of R.A. and decl.) which have no record in these three databases are new discoveries; for the 1782 spectra showing ionization nebula features, most of them have radial velocities less than 150 kilometers per second. We check them with the latest version of WISE H ii catalog V2.0 (short for HIICat V2) and 985 out of the 1782 spectra belong to 72 H ii regions. Of these H ii regions, 43 were previously identified while the other 29 are newly identified in this work including 797 newly observed spectra. Besides, there are still 2656 spectra that cannot be clearly classified although they have obvious emission lines and with small redshift. Finally, 106 new emission-line galaxies and 29 new Galactic H ii regions are identified, and we conclude that the ANN method sped up by the PQ algorithm is efficient in solving the problem of pairing spectra with massive data set to figure out their classes. We present our result at the link http://paperdata.china-vo.org/LY_paper/Work2/pressWork2_last.zip.
PASTE: FPGA-based Portable At-speed Scan Test Equipment
Authors: Luo Min , Hu Chunmei , Yin Xingyi , Wang Yaohua , Zhao Zhenyu , Hu Xiao 
Published: April 2022

Abstract
The increasing integration and complexity of chips driven by Moore’s Law has placed higher demands on chip verification and testing efforts. Automated Test Equipments (ATE) in conjunction with design for testability can effectively screen out faulty chips, but ATE is too costly and can be functionally redundant to be practical for small and medium-sized chip design companies and scientific research in universities. Therefore, in recent years, there has been a lot of research work on FPGA-based low-cost test equipment, but few studies have used the scan test method and have not been able to realize the at-speed test of the chip. In this paper, we propose a portable, low-cost and configurable FPGA-based chip scan test method, which can realize both normal and at-speed test, and can effectively filter the stuck-at faults and transition faults of the chip. We also optimize the test code size via run-length code compression algorithm and achieve a 68.16% compression rate for the test code, which effectively reduces the overall data storage and transmission overhead.
Design and Optimization of Metal Cavity Bandpass Filter and Fragmented Patch Antenna By Combining Simulation Software and Genetic Algorithm
Authors: Li Wenqi , Wong Sai-Wai , Ou-Yang Le , Wang Diji 
Published: April 2022

Abstract
An electromagnetic (EM) structure optimization method based on Genetic algorithm (GA) and EM simulation software is proposed. The aim is to accelerate optimization speed of electromagnetic structure and improve designed performance. An algorithm considered continuous and discrete problems is adopted to expand design domain of electromagnetic structures. In order to evaluate the performance of proposed method, a fourth-order cavity bandpass filter and a fragmented patch antenna are considered as two examples to verify the analysis.
A Fourth-order Dielectric Narrow-band Bandpass Filter Using Coaxial Resonator
Authors: Wang Diji , Wong Sai-Wai , Li Wenqi 
Published: April 2022

Abstract
In this paper, a compact fourth-order dielectric bandpass filter is proposed. The filter adopts the mode of linear coupling and is composed of four coaxial resonators and two coupling slots, which are fed by two probes, and the four coaxial resonators are resonated to form a passband. The resonant frequency can be controlled by the radius and height of the resonators, and the inter-cavity coupling is controlled by the width of the coupling windows formed by the coupling slots. At last, the simulation results of the filter show that the filter has narrow bandwidth and good in-band matching performance and out-of-band suppression.
Implementation and Verification of Steganography IP Core Based on HLS and OpenCV
Authors: He J J , Sun W , Jiang H 
Published: April 2022

Abstract
Steganography is a safe transmission method that hides secret data in public information to avoid attacks as much as possible. However, the current steganography research and application mainly stay in the software stage. Although the secure transmission of data is realized, it is difficult to realize the purpose of high-speed data transmission. This thesis solves this problem with the help of a fully parallel, high-speed and high-bandwidth FPGA. This paper uses HLS to design a steganography IP core that can be applied to FPGA, and uses OpenCV to quickly and effectively verify the IP core. The final result proves that this paper successfully designed a high-performance IP core that can realize steganography, which effectively solves the problem of difficult high-speed transmission of encrypted data. This IP core combines the AXI bus protocol, which not only facilitates data interaction with DDR3 and other devices, but also conducive to the design and optimization of the complete secret data transmission system in the future.
Multi-scale cooperative search simplified particle swarm optimization algorithm and performance analysis
Authors: Zheng Yanling , Wang Zhankui 
Published: April 2022

Abstract
A multi-scale cooperative searching simplified PSO (MSPSO) was put forward to avoid the standard PSO (SPSO) premature, which was put forward by simulating ants working cooperatively in nature. Its particles trajectories were analyzed and its convergence was proved. The numerical experiment indicates that the MSPSO has better searching performance, especially in solving the higher dimensional optimization problems.
An Improved Particle Swarm Optimization Algorithm for Unmanned Aerial Vehicle Route Planning
Authors: Wang Xiaolu , Huang Chen , Chen Fuhao 
Published: April 2022

Abstract
A global path planning method based on improved particle swarm optimization (PSO) algorithm was proposed to find a high quality flight trajectory in three-dimensional complex environment under multiple threats for UAV. The improved path planning algorithm combines the standard PSO with A* method to compensate for the slow convergence rate of PSO. The objective function with multiple constraints of A* method is used to evaluate the quality of the waypoint, and the objective function of PSO algorithm is designed to evaluate the quality of the candidate path. To verify the effectiveness of the improved algorithm, the improved PSO algorithm is used to compare with basic PSO algorithms. The experiment in complex environment shows it has stronger search ability, convergence ability due to the improvement of population diversity and convergence speed.
A FPGA-based Accelerator Implementation for Path Planning using Q_learning Algorithm
Authors: Liu Xiaojuan , Diao Jietao , Li Nan 
Published: April 2022

Abstract
As one of the most classic reinforcement learning, Q_learning has a very wide range of applications in the control filed of robot. Path planning which is the center of robot control has high computation speed requirements for algorithms, so we need to accelerate by hardware while planning path using Q_learning. In this paper, a hardware accelerator architecture based on FPGA is implemented to accelerate Q_learning while used in path planning. And we evaluate our design on Artix-7 DDR3 board, leading to less FPGA resource consumption and swifter computation speed. Comparing to Q_learning which implemented based on CPU, the speed has improved approximately 519 times, achieving the purpose of accelerating the Q_learning algorithm.
Research on High Precision Linear Motor Driving Technology
Authors: Zhu Min , Shang Zhixia 
Published: April 2022

Abstract
Aiming at the problem that the output of motor driver driving linear motor is not stable enough and will be accompanied by large power ripple, which makes the motor speed unstable and has a great impact on the accuracy, a linear driver is designed. The AB power amplifier circuit is mainly used by the linear driver to achieve linear output of current, and the negative current feedback is used to stabilize the output current. For the software part, a program based on ARM is designed to parse the commands of the upper computer and control the hardware circuit according to the commands, so as to achieve specific functions. The test results show that the non-linear error of the power amplifier driver is only 3.6%, and the three-phase sinusoidal current with different frequencies and amplitudes can be output as needed.
Coplanar Dual-Band Dual-Polarized Shared-Aperture Antenna Array For 4/5G Base Station Applications
Authors: Lin Yecong , Wong Sai-Wai 
Published: April 2022

Abstract
A novel dual-band dual-polarized shared-aperture antenna array is presented for fifth generation wireless communication application. This novel antenna array is a combination of a low-band antenna and four high-band antennas. In order to simplify the design model while achieving broadband, antenna working on low-band (from 0.68 to 0.99 GHz) and antenna working on high-band (from 3.3 to 5.1 GHz) are both loop-shape radiator fed by Y-shape feed. Coplanar, dual-band and shared-aperture are resolved by embedding four HB antenna elements in the LB antenna. From simulation, the proposed coplanar antenna array respectively achieves 43% (from 0.68 to 0.99 GHz) and 37% (from 3.3 to 5.1 GHz) impedance bandwidth in the low-band and high-band.
PANDORE: an environmental box for ITk integration tests
Authors: Costanza F. , Allemandou N.G. , Chabanne E. , Cornudet E. , Delebecque P. , Gaglione R. , Jeremie A. , Leveque J. , Massol N. , Mievre I. , Prevost O. , Vilalte S. 
Published: April 2022

Abstract
PANDORE is the environmental box that is going to be used for the quality control of loaded local supports of the ATLAS ITk Pixel Outer Barrel at LAPP (Annecy, France). First PANDORE, its interlock system, diphasic CO2 cooling station, and data acquisition system are described. Subsequently, the results of the qualification tests are shown. Given the complexity of the ITk Pixel Outer Barrel system, several loading sites are going to be needed. By documenting the state-of-the-art of PANDORE, this note aims to help the wide ITk Pixel community in the discussion for standardizing the quality control procedure and equipment of the loaded local supports.
A modular and flexible data acquisition system for a cosmic rays detector network
Authors: Saito G.T. , Leite M.A.L. , Menegasso R. , Kuriyama M.K. , Munhoz M.G. , de Paula R.E. 
Published: April 2022

Abstract
In this paper, we describe a modular data acquisition system developed as the foundation of a cosmic ray detector network. Each detector setup (henceforth referred as a station) is composed of an independent hardware device that can be controlled and read-out through the Internet. This device is designed to acquire and process the signal of up to eight different detector planes. Each of these detector planes uses plastic scintillator slabs that are optically coupled to silicon photomultipliers (SiPM). Within a single station, different geometries and plane orientations are possible using the same baseline design. The main readout is based on a programmable system-on-a-chip (PSoC), a flexible and re-configurable commodity hardware that is used to implement the trigger and timing logic. A Time to Digital Converter (TDC) is used to determine the precise timing of the event relative to a GPS timing signal and to estimate the signal amplitude through the Time-over-Threshold (ToT) method. An auxiliary set of sensors provide environmental information and station detector planes orientation that, together with other operation data, are periodically sent to a server using the MQTT protocol. Data is cached using an in-memory database for online monitoring and further persisted into a SQL database for offline analysis. The server framework is based in software application containers allowing easy replication of the server infrastructure.
A radiation tolerant 12 bit, 160 MS/s data conversion and transmission ASIC for the CMS electromagnetic calorimeter
Authors: Mazza G. , Argirò S. , Dellacasa G. , Mignone M. , Soldi D. , Varela J. , Wheadon R. 
Published: April 2022

Abstract
The readout electronics for the CMS electromagnetic calorimeter is undergoing a re-design in order to cope with the LHC ugrade. In particular, a fourfold increase in the sampling frequency (from 40 to 160 MS/s) is required. Therefore a new readout ASIC has been developed. The ASIC, named LiTE-DTU, is designed in a CMOS 65 nm technology. The LiTE-DTU embeds two 12 bit, 160 MS/s ADCs, a time window based sample selection, lossless data compression and 1.28 Gb/s serialization. An on-chip PLL provides the 1.28 GHz clock required by the ADCs and the serializers from the 160 MHz clock.
Hydrodynamic cavitation through a bio-inspired fast-closing plunger mechanism: experiments and simulations
Authors: Godínez F A , Guzmán J E V , Salinas-Vázquez M , Valdés R , Palacios C , Chávez O 
Published: April 2022

Abstract
Experimental and numerical results are reported for the internal and external flow fields evolving in a bio-inspired snapping plunger. The experimental evidence underlines the nature of the dynamic-coupling between the processes taking place inside and outside the device. Two main structures dictate the properties of the external flow field: a strong jet which is followed by a vortex ring. Internally, complex patterns of cavitating structures are simultaneously produced in the chamber and the venturi-like conduit. We find the cavitation cycle to be suitably described by the Rayleigh–Plesset model and, thus, proceed to characterize the coupling of both fields in terms of the fluctuations of the velocity. All main parameters, as well as the energy released to the fluid during the collapse, are found to be within the same order-of-magnitude of previously known experimental results for isolated bubbles of comparable size.
Diurnal and seasonal patterns of global urban dry islands
Authors: Meili Naika , Paschalis Athanasios , Manoli Gabriele , Fatichi Simone 
Published: April 2022

Abstract
Urban heat islands (UHIs) are a widely studied phenomenon, while research on urban-rural differences in humidity, the so called urban dry or moisture islands (UDIs, UMIs), is less common and a large-scale quantification of the seasonal and diurnal patterns of the UDI is still lacking. However, quantification of the UDI/UMI effect is essential to understand the impacts of humidity on outdoor thermal comfort, building energy consumption, and urban ecology in cities worldwide. Here, we use a set of globally distributed air temperature and humidity measurements (1089 stations) to quantify diurnal and seasonal patterns of UHI and UDI resulting from rapid urbanization over many regions of the world. The terms ‘absolute UDI’ and ‘relative UDI’ are defined, which quantify urban–rural differences in actual and relative humidity metrics, respectively.
Results show that absolute UDI is largest during daytime with the peak humidity decrease in urban areas occurring during late afternoon hours. In contrast, relative UDI is largest during night and the peak urban relative humidity (RH) decrease and vapor pressure deficit (VPD) increase occurs in the late evening hours with values of around −10% to −11% for RH and 2.9–3.6 hPa for VPD between 20–00 local time during summer. Relative and absolute UDIs are largest during the warm season, except for daytime RH UDI, which does not show any seasonal pattern. In agreement with literature, canopy air UHI is shown to be a nighttime phenomenon, which is larger during summer than winter. Relative UDI is predominantly caused by changes in actual humidity during day and UHI during nighttime.
Spatiotemporal analysis of deforestation patterns and drivers reveals emergent threats to tropical forest landscapes
Authors: Jamaludin Johanness , De Alban Jose Don T , Carrasco L Roman , Webb Edward L 
Published: April 2022

Abstract
As deforestation breaches into new tropical frontiers, proactive conservation strategies require a trifecta of information on where deforestation is accelerating (emergent), how drivers of deforestation vary spatiotemporally, and where to focus limited conservation resources in protecting the most integral yet threatened forested landscapes. Here we introduce Emergent Threat Analysis, a process integrating Emerging Hot Spot Analysis of deforestation, visual classification of deforestation outcomes over time, and spatial quantification of contemporary forest condition. We applied Emergent Threat Analysis to tropical Southeast Asia, a global epicentre of biodiversity threatened by deforestation. We found that emergent hot spots (EHS)—a subset of hot spots characterized by strong, recent, and clustered patterns of deforestation—accounted for 26.1% of total forest loss from 1992 to 2018, with deforestation within EHS proceeding at 2.5 times the regional rate of gross loss. Oil palm and rubber plantation expansion were the principal drivers of deforestation within EHS of insular and mainland SE Asia, respectively. Over the study period, oil palm shifted in importance from Sumatra and Sarawak to Papua and Kalimantan, whereas rubber became prominent in Cambodia and Tanintharyi from 2006 to 2015. As of 2019, more than 170 000 km2 of SE Asia’s remaining forest occurred within EHS, of which 21.7% was protected. High and medium-integrity forest constituted 19.2% and 49.1% of remaining EHS forest, respectively, but of these, 35.0% of high-integrity and 23.9% of medium-integrity EHS forest were protected. Because we anticipate that tree plantation expansion will continue to drive deforestation in SE Asia, significantly heightened protection is needed to secure the long-term preservation of high and medium-integrity forest, especially in highly contested forest frontier regions. Finally, as a flexible, integrated process, Emergent Threat Analysis is applicable to deforestation fronts across the global tropics.
Intermediate statistics in singular quarter-ellipse shaped microwave billiards*
Authors: Dietz Barbara , Richter Achim 
Published: April 2022

AbstractWe report on experiments with a flat, superconducting microwave billiard with the shape of a quarter ellipse simulating a singular billiard, that is, a quantum billiard containing zero-range perturbations. The pointlike scatterers were realized with long antennas. Their coupling to the microwaves inside the cavity depends on frequency. A complete sequence of 1013 eigenfrequencies was identified rendering possible the investigation of spectral properties as function of frequency. They exhibit intermediate statistics and are well described by analytical results derived by Bogomolny, Gerland, Giraud and Schmit for singular billiards with shapes that generate an integrable classical dynamics. This comparison revealed a quadratic frequency dependence of the coupling parameter. The size of the chaotic component induced by the diffractive effects of the scatterers was determined by comparison with analytical results derived by Haake and Lenz for an additive random-matrix model, which interpolates between the models applicable for quantum systems with an integrable and chaotic classical dynamics, respectively.
The role of land use/cover type in influencing hydrological component of a watershed in Chancho and Sorga Sub-watersheds, East Wollega Zone, Oromia, Ethiopia
Authors: Megersa Tolera , Nedaw Dessie 
Published: April 2022

Abstract
Watershed hydrology can be influenced by land use/cover types of the study areas. The activities of humans exert more pressure in influencing the natural dynamism of the watersheds and hydrology through continuous and steep slope cultivation of land. The objective of this study was to assess the influences of land use/cover types and slope gradient on hydrological component of a watershed. The hydrological component of a watershed was simulated by SWAT model with arc-GIS where land use/cover map, slope map and hydrological response unit were used as an input. Farmland land has produced more surface runoff and water yield as compared to the other land use types followed by urban land, while Forest and grassland produced less surface runoff and water yield but higher in evapotranspiration, percolation, ground and lateral flow of water than cultivated and urban land. Area of farmland land is more responsive to the change of surface runoff and water yield than others land use/cover types. As farmland land size increases both surface runoff and water yield tends to decrease and had a negative correlation, whereas, other hydrological variables were less responsive to the change in land size. Slope gradient of land use/covers type contributes to the water imbalance of the watersheds. As slope increases surface runoff and water yield also decreases in farmland, grass, and forest land, whereas, increases in urban land as slope increased. The influences of land use/cover types and slope gradient on the watershed hydrology were more observed where human action is high in terms of continuous and steep slope cultivation and urban built-up expansion and appropriate land use and watershed management is paramount important for water balance in the watershed.
Identification of Sambiloto agroecology as a basis for utilization and conservation of germplasm
Authors: Pujiasmanto Bambang , Rumia Manurung Ida 
Published: April 2022

Abstract
Climate change can affect the diversity and growth of tropical plants, one of which is Sambiloto. Sambiloto is a wild plant with medicinal potential that is experiencing scarcity due to climate change in Indonesia. This study aims to identify the agroecological suitability of Sambiloto. The research was carried out using the survey method. The survey method includes the study of description and identification and the distribution pattern of sambiloto. The results showed that Sambiloto could grow at an altitude of 180 – 861 meters above sea level with a temperature of 20.32 °C -26.93 °C, relative humidity 78% - 87%, rainfall 2053.2-3555.6 mm/year. Sambiloto can grow on soils with moderate N, low P, low Mg, very low to low Ca, low to moderate organic C, while the pH is slightly acidic to acidic. The distribution pattern of sambiloto in the middle and lowlands is clustered, while in the highlands, it is uniform. The highest andrographolide content was obtained from sambiloto in the middle plains (2.27%), while in the lowlands (1.37%) and highlands (0.89%). Sambiloto is more commonly found in the middle lands (RD 76.87%, RF 10%, RK 27.75%, IVI 114.62%) than in the lowlands (RD 59.50%, RF 9.09%, RK 31.41%, IVI 99.98%), and highlands. (RD 42.20%, RF 3.88%, RK 11.62%, and IVI 78.21%).