bluuebunny/crossref_metadata_2025_split huggingface dataset:
Analysis on The Status of Deep-well Geo-electrical Resistivity Observation in China Geoelectric Network
Authors: Wang Xiao , Ye Qing , Liu Gaochuan , Fan Ye 
Published: December 2023

Abstract
With the deterioration of the observation environment and the increasing interference of surface stray currents, the commonly used surface resistivity observation is facing severe challenges. China began to experiment and develop deep-well geo-electrical resistivity observation. In this paper, the characteristics of the observation system of each resistivity station are counted and analyzed, and the data quality of the deep-well geo-electrical resistivity observation and the ground resistivity observation at the same site is compared in terms of relative standard deviation and annual variation. The results show that the operation of deep-well geo-electrical resistivity observation stations is in good condition, and its data quality and anti-interference ability are superior to ground resistivity observations. The results provide support for the popularization and application of deep-well geo-electrical resistivity observation technology, which can better serve seismic analysis and prediction.
Study on Resistivity Imaging of Urban Landfill Leachate Channel Using 3D Electrical Resistivity Tomography with Annular Electrode Configuration
Authors: Cheng Jiulong , Zhang Yuqi , Shen Yifan , Li Yao , Huang Jiaxin 
Published: December 2023

Abstract
Urban garbage landfills are distributed mostly in a nearly circular shape with complex internal and external environments. The conditions on the top of the landfills are not conducive to the layout of electrical measuring lines and electrodes, resulting in difficulties in using the conventional linear or rectangular mesh high density electrical surveying system to achieve good results for the detection of leachate channel under the garbage body. This paper proposed 3D electrical resistivity tomography (ERT) method by annular electrode configuration with electrodes placed around the landfill. Through numerical simulation and indoor physical simulation experiments, we have discussed the feasibility and effectiveness of this method for circling the pollution range and channel location of landfill leachate. The study shows that the 3D ERT method with annular electrode configuration can effectively detect the spatial location and extension of garbage leachate channel, reflect the leakage of garbage leachate in landfills, and thus provide technical support for the fine detection of garbage leachate channel.
Numerical Simulation and Characteristics Analysis of VSP Seismic Data in Complex Loess Plateau Area
Authors: Fu Jiawei , Sun Zhangqing , Han Fuxing , Wang Ruihu , Liu Yaguang , Lu Jipu , Cen Wenpan , Gao Zhenghui 
Published: December 2023

Abstract
The numerical simulation and characteristic analysis of VSP seismic data in the complex Loess Plateau area is of great significance to the design of seismic acquisition systems and the velocity modeling in near-surface areas. In this paper, we establish a velocity model of complex Loess Plateau and design three VSP acquisition systems in this model. Then, a finite difference method (FDM) for seismic modeling in the complex topographical condition is used to simulate the VSP data in this model with the above acquisition systems. Finally, based on the analysis to these data, some basic characteristics of VSP data in the complex Loess Plateau area are obtained and their significances to seismic exploration in this area are given.
Application of Horizontal-to-vertical Spectral Ratio with a Dense Linear Array on Prospecting Urban Underground Active Faults: a Case in The Mingguang City, Anhui Province
Authors: Ni Hongyu , Zhang Ruohan , Huang Xianliang , Zheng Haigang , Li Junhui , Hong Dequan , Bao Ziwen 
Published: December 2023

Abstract
Reliable knowledge of sedimentary structures is beneficial for the study of active faults covered by sediments and can also provide important information for seismic hazard assessment, earthquake emergency response and urban planning. Based on the dense seismic array with a spacing of ∼ 60 m between stations and a length of ∼ 8 km, the horizontal-to-vertical spectral ratio (HVSR) curves were obtained at 133 stations with the ambient noise, and the two-dimensional sedimentary structures of the Quaternary and Neogene strata were imaged over two main faults of the Tanlu fault zone in the eastern Jiashan Basin by frequency-depth conversion. The variations (∼ 130 m) in the depth of the Quaternary and Neogene sedimentary basement directly beneath the fault zone agree well with the spatial characteristics of the fault revealed by the shallow seismic reflection profile with active sources at the same locations.
Analyze the Difference Between Rotational and Translational Motions Produced by High-speed Train
Authors: Rong Chao , Zhang Dingfan , Cao Yuwen , Li Zhengbin 
Published: December 2023

Abstract
The development of fiber optic gyroscope technology makes it possible to directly measure the rotational ground-motion. The joint observation of the three-component rotational seismometer and the traditional three-component translational seismometer is a trend of future. In this paper, the translational and rotational signals generated during the high-speed trainway are studied, and the three-component translational and rotational seismometers are fixed together to realize the joint recording of the high-speed trainway signal. Comparing the translational and rotational three-component data, we find that only one component waveforms and the spectrum have certain consistency. However, the difference between them indicates that the rotation and translation signals generated by the shallow surface wave signal have different frequency bands.
Seismic Velocity Response to the Ocean Waves Based on Borehole Array
Authors: Meng Yi , Guo Pan , Wang Liwei , Liu Zhikun 
Published: December 2023

Abstract
The ambient noise correlation in recent years has been widely used to study the seismic velocity temporal variation related to volcanoes, geothermal fields, earthquake source regions. However, in some regions and times, seasonal seismic velocity changes which could be attributed to environmental factors, including temperature, atmospheric pressure and groundwater, can also be observed. Eliminating the influence of these environmental factors in the temporal variation monitoring results of subsurface media will be helpful to obtain the clear changes of shallow media due to tectonic activities. We used the ambient noise correlation technique of multi-component and multi-frequent-band to obtain the seismic velocity variation of crustal media in Hailing Island, Guangdong Province, China. The results show that the seismic velocity variation of crustal medium in the study area has a strong correlation with the ocean wave height
Research on Body Wave Extraction Technology of Mixed Active Source Ambient Noise
Authors: Liu Di 
Published: December 2023

Abstract
In complex surface environments, active source seismic exploration methods are difficult to stimulate and costly, while ambient noise detection technology is fast and convenient, with a little environmental damage and low cost. Therefore, it has aroused extensive research by scholars at home and abroad. At present, the use of passive source surface wave method for subsurface medium imaging has become mature. However, due to the low content and weak energy of the body wave signal in the actual ambient noise, it is particularly difficult to extract body waves using seismic interferometry. At the same time, body wave exploration has larger exploration depth and higher resolution. In this paper, we propose an ambient noise detection technology of mixed active sources, namely, imposing artificial seismic sources in the continuous ambient noise data acquisition process. We refer to the ambient noise of mixed active sources as "mixed ambient noise". It is found that the virtual refraction wave obtained by the ambient noise detection method of mixed active sources has high signal-to-noise ratio, strong anti-interference ability, and can obtain the real velocity information of the deeper subsurface medium, but cannot reflect the accurate time information. Supplementing the active source signal in the far field can obtain virtual refractions with higher signal-to-noise ratio, while effectively reducing the mixing phenomenon of surface wave and surface interference waves in the virtual common-shot record.
Research on Low Noise Chopping Amplifier Circuit Based on Feedback Regulation
Authors: Wang Shengjie , Yan Fuxue , Sun Yishu , Zhang Yang , Lin Jun 
Published: December 2023

Abstract
In order to overcome the limitation of 1/f noise on long-period magnetotelluric sensors, it is necessary to use low-noise chopping technology for signal conditioning. However, the static operating point drift of Junction Field-Effect Transistor (JFET) is difficult to achieve stable amplification with the chopper technology. This paper proposes a low noise amplifier (LNA) with chopper technology based on feedback adjustment. The LNA reduces the turning frequency of the circuit, and maintains the JFET static point. At 375mHz, its noise is

2.55
nV
/

Hz

.
A DFT-Based Method for Extraction Effective High Density Electromagnetic Signal from Pseudo-random Code
Authors: Liu Xiaohan , Han Jiangtao , Liu Lijia , Guo Zhenyu 
Published: December 2023

Abstract
Pseudo-random signal, also known as pseudo-random code, which has statistical properties similar to random signal and can be repeatedly generated, so it is widely used in the field of signal transmission. Pseudo-random code is used as the carrier of an improved high-density electromagnetic system to improve the reliability and stability of the measurement. However, how to effectively extract the effective signal in the pseudo-random code is very important.In this paper, a method based on Discrete Fourier Transform (DFT) is proposed to extract effective signal from pseudo-random code. By analyzing the amplitude-frequency characteristics of the discrete spectrum of pseudo-random code, the search range of frequency bands can be narrowed. Find the maximum of a one-dimensional array to obtain the best estimate of the target frequency and its magnitude in the limited range of frequency bands. Simulation experiments and measured data show that the frequency data extracted by the method in this paper is highly consistent with the preset frequency, with little amplitude loss and less alias. Therefore, the method can extract the response information of the specified frequency contained in the pseudo-random code effectively with high efficiency.
An Efficient Seismic AVA Inversion Method with Uncertainty Quantification Using Ensemble Kalman Filter Scheme
Authors: Li Guangcai , Wang Xinyug , Wang Tong , Yong Fan 
Published: December 2023

Abstract
The Ensemble Kalman Filter (EnKF) has attracted large amount of attention and it has become a relatively competitive method. The rationale underpinning the Ensemble Kalman-based methods is that it uses the Kalman formula to generate an ensemble of inverse estimates of the geophysical and geologic properties. Each ensemble member may be updated via an iterative or non-iterative way and in sequential (filtering) or all-at-once (smoothing) basis. We try to perform AVA inversion via EnKF to extract the subsurface elastic parameters including P-wave velocity, S-wave velocity and density, which is of significance for further delineation in oil reservoir. We apply this method on a synthetic AVA dataset of 40 degrees using a well data. Numerical tests with the synthetic data have revealed the success of the proposed methods.
Depth-to-basement Estimation of Basin Relief Using the BP Network
Authors: Li Qiang , Wang Rui , Li Guowei , Xu Zhengwei 
Published: December 2023

Abstract
Nonlinear gravity inversion is a popular method for determining basin bottom relief and delineating basin configuration. However, traditional gravity inversion presents certain challenges, including the complexity and time demand of calculating and transforming large matrices, as well as instability and non-uniqueness caused by the inherently ill-posed nature of inversion problems. Over the past decade, deep learning, a subset of machine learning, has seen successful applications in geophysical interpretation and exploration. In this study, we propose an innovative method for estimating two-dimensional (2D) depth-to-basement using a BP network structure. This structure leverages the Leaky Rectified Linear Unit (ReLU) as an activation function, yielding more realistic geophysical models.
Marine Absolute Gravimetric Survey Based on Atomic Gravimeter
Authors: Qiao Zhongkun , Yuan Peng , Zhou Yin , Wu Bin , Lin Qiang 
Published: December 2023

Abstract
Atomic gravimeter can be used for absolute gravity measurement and has the advantages of low drift, high accuracy and good long-term stability. It can be combined with traditional gravimeter to realize long period and high precision dynamic measurement of gravity field at sea. With the development of relevant technologies and the increasing demand of the application market, mobile and miniaturized atomic gravimeters at home and abroad have stepped out of the laboratory and gradually tried to measure absolute gravity in dynamic environments on platforms such as vehicle, ship and airborne. Based on the Marine atomic gravity measurement system of Zhejiang University of Technology, this paper introduces the system composition, measurement principle and existing difficulties. Based on this system, the first Marine absolute gravity network measurement in China is carried out, and the accuracy of repeated internal check is better than 1mGal.
The 18th Siam Physics Congress (Quantum Era : Together and Beyond; SPC2023)
Authors: Laosiritaworn Y , Choopan S , Boonyawan D , Aukkaravittayapun S , Tawkomnoy J , Soonthornthum B 
Published: December 2023

The 18th Siam Physics Congress (SPC2023) was successfully held during 14–16 June 2023, co-hosted by the Thai Physics Society and the Chiang Mai University. To motivate collaborative academic environment, the congress was organized to be a 100% on-site meeting at the Empress Convention Center in Chiang Mai (Thailand).
This year, we had 329 research abstracts submitted for both oral and poster presentations. There were 3 plenary speakers, 17 invited speakers, 110 accepted oral presentations, 187 accepted poster presentations, and 116 full papers submitted for possible publication in all 10 tracks(topics). The scientific program was announced on the SPC2023 website (https://spc2023.science.cmu.ac.th) and also distributed via email to all participants.
The opening ceremony was given by the President of Thai Physics Society and the President of Association of Asia Pacific Physical Societies (AAPPS). After opening ceremony, Prof. Dr. Junichi Yokoyama (The University of Tokyo, Japan) gave the 1st plenary talk (onsite), Prof. Dr. Jian-Wei Pan (University of Science and Technology of China) gave this 2nd plenary talk (zoom), Assoc. Prof. Dr. Tawatchai Onjun (Thailand Institute of Nuclear Technology) gave the 3rd plenary talk (onsite), where the size of the audience attending the plenary talks is approximately 500 participants. The oral presentations were arranged into 5 parallel rooms in total of 10 sessions. Each invited speaker was allowed 30-minutes presentation while regular presenter had 15 minutes including questions and answers. The audience-size of each room varied between 30 and 50 people. The poster presentations were held in the poster hall and lasted for 2 hours, which offered extended opportunity to gain insights into the latest research. For full papers, authors of accepted abstracts were invited to submit their full-scale works through the Morressier website for a possible publication in the Journal of Physics : Conference Series.
List of Topic, Plenary Speaker, Organizing Institutions, Advisory Committee, Organizing Committee, Scientific Committee, Ceremony Committee, Finance Committee, Registration Committee, Venue and Transportation Committee, Sponsorship and Fundraising Committee, Public Relations Committee, Audio Visual Aid Committee, Sponsors are available in this Pdf.
Evaluation of the effectiveness of an electromagnetic shielding enclosure at low frequencies
Authors: Wungmool P , Osaklung J , Kijamnajsuk P , Luengviriya C 
Published: December 2023

Abstract
We construct an electromagnetic shielding enclosure with dimensions of 95 cm × 95 cm × 95 cm. It is made from aluminum and copper which are high electrical conductors and nonmagnetic materials, so the enclosure does not produce additional static magnetic field. The enclosure is composed of a cubic frame (25-mm aluminium rails) and 6 removable panels. Each panel consists of a copper mesh (wire diameter of 0.25 mm and 0.58 mm spacing) sandwiched in a double layered aluminium frame, two aluminium handles, and 4 aluminium hooks. The electromagnetic shielding effectiveness of the enclosure is evaluated using the standard method at low frequencies, 0.4–25 MHz. A function generator and a circular flat coil with a diameter of 5 cm are used to transmit sinusoidal electromagnetic waves directed to the enclosure. The electromagnetic waves transmitted into the enclosure are measured by a spectrum analyser and another similar circular flat coil. The measurements show that when the frequency is increased from 0.4–2.5 MHz, the shielding effectiveness slightly increases from 42.2–48.6 dB. For the frequency between 3–25 MHz, the shielding effectiveness remains at around 49.6 dB with a standard deviation of 0.6 dB. Such shielding enclosure is potentially improving the accuracy of many investigating techniques which use electromagnetic waves with low frequencies including nuclear quadrupole resonance and magnetic induction tomography.
Assessing conceptual understanding of learning in energy and momentum by using Socrative online polling in physics classes
Authors: Umma K , Gatemunee T 
Published: December 2023

Abstract
This research investigates the understanding and learning gains of students learning between online and onsite classes on topics of Energy and Momentum. In this study, twenty-five questions relating to Energy and Momentum, including Energy Concepts, Work Done by Gravitational Forces, Work Done by Nonconservative Forces, Conservation of Mechanical Energy, Momentum Concepts, Momentum Conservation, Completely Inelastic Collisions, and Applications of the Impulse-Momentum Theorem, were used. One hundred and ninety-five students from the Faculty of Engineering at Rajamangala University of Technology Lanna, Chiang Mai campus, were tested through online and onsite learning between 2021 and 2022, respectively. The collected data were evaluated using Socrative online polls. Statistics, including average percentage, standard deviation, and the normalized gain method, were used to analyze the understanding of learning between the pre-test and post-test of online and onsite classes. The results found that after classes, the mean of correct answers for online classes was 18.76 (SD = 2.81) and 20.68 (SD = 3.19) for onsite classes. The average normalized gain <g> for online classes was 0.01, and for onsite classes was 0.05. These results demonstrated that onsite learning was more effective than online learning.
Enhancing particle size characterization performance through proficiency testing program: result and insights from inter-laboratory comparison
Authors: Ngansalung B , Chanthawong N , Buajarern J 
Published: December 2023

Abstract
The proficiency testing (PT) for particle size characterization by inter-laboratory comparison was organized by the dimensional metrology department of the National Institute of Metrology Thailand (NIMT). This program aims to enhance and to expand the efficiency and capability of testing laboratories in the field of particle size characterization using various techniques, including atomic force microscope (AFM), transmission electron microscope (TEM), scanning electron microscope (SEM), and dynamic light scattering (DLS). The measurement range covers nanometer to micrometer scale. These instruments are importance for research and development especially to nanotechnology related industries. The PT program was conducted in 2022 where five artifacts were used: monodispersed gold nanoparticle (diameter 20 nm), monodispersed polystyrene particle (diameter 100 nm, 500 nm, and 1500 nm) and monodispersed silica oxide particle (diameter 100 nm). The monodispersed polystyrene particles, diameter 100 nm and 1500 nm are certified reference materials (CRMs). These two artefacts were used as the reference to evaluate accuracy of participant laboratories. The other 3 artefacts are reference material under development. Hence, the assigned values were calculated from consensus among all participants. To evaluate the performance of participant laboratories, En
values and z-scores were calculated for each artefact and each measuring technique. The assessment of participant performance through performance scores allows the participant to determine how accurate and how appropriate the measurement results and measurement uncertainties evaluation are. From the results, unsatisfied results can be categorized into three scenarios. First, the measurement uncertainties were not appropriately evaluated. Secondly, measurands obtained from all measuring techniques are not the same. Lastly, the magnification used in microscopy techniques plays a crucial role to resolution and accuracy of size determination.
An application of polychromatic UV-Vis-NIR spectroscopy on detection of beryllium treatment in ruby and yellow sapphire
Authors: Monarumit N , Lhuaamporn T , Schwarz D , Wathanakul P , Wongkokua W 
Published: December 2023

Abstract
The ultraviolet-visible-near infrared (UV-Vis-NIR) spectroscopy has been essentially used to characterize gem materials and their treatments. The spectrophotometer was designed using a diffraction grating to provide the monochromatic light from a tungsten lamp in analyzing a sample. The signal is recorded by a photodiode, resulting in a characteristic spectrum of a gemstone sample. While the monochromatic UV-Vis-NIR spectrophotometer is used for characterizing treated ruby and yellow sapphire samples; however, some indicative characteristic absorptions could be missing. The technique may not be able to clearly differentiate the Be-treated ruby and yellow sapphire samples from the natural ones. Therefore, polychromatic UV-Vis-NIR spectroscopy could be utilized. The polychromatic light from a tungsten lamp passing through the sample provides the polychromatic UV-Vis-NIR spectrum produced by the spectrophotometer comprising a diffraction grating with a diode array CCD or CMOS detector. Both natural and Be-treated ruby and yellow sapphire samples were measured using both spectrophotometers. The experiment reveals that the polychromatic UV-Vis-NIR excitation spectroscopy can be used to differentiate the Be-treated ruby and yellow sapphires from the natural ones. Moreover, the polychromatic UV-Vis-NIR spectrophotometer offers the advantages of portability, measuring time, and low cost.