bluuebunny/crossref_metadata_2025_split huggingface dataset:
Variational existence proof for multiple periodic orbits in the planar circular restricted three-body problem
Authors: Kajihara Yuika , Shibayama Mitsuru 
Published: February 2022

Abstract
The restricted three-body problem (R3BP) is an important research area that deals with significant issues in celestial mechanics, such as analyzing asteroid movement behavior and orbit design for space probes. We aim to show the existence of periodic orbits in the planar circular R3BP. To find these orbits, we adapt a variational approach and symmetry.
Characteristic analysis under small-stroke and medium-high frequency of magneto-rheological damper with pressure controlled mechanism
Authors: Dong X M , Li P Y , Yan M S , Li X 
Published: February 2022

AbstractDue to the high frequency hardening effect in applications of satellite and precision vibration isolation, it is an urgent need to analyze and improve the magnetorheological (MR) performance of MR damper under small-stroke and medium-high frequency excitations. In this paper, a compact MR damper with pressure controlled mechanism is proposed, analyzed and tested. Considering the inertial, pre-compression and compressibility of MR fluid, the dynamic physic model is established to analyze the output characteristics with pre-compressions under small-stroke and medium-high frequency excitations. And then, the critical model between the pre-yield region and post-yield region is obtained. The critical boundary between different excitations is derived and comparatively analyzed. Finally, the experiments with the proposed MR damper are carried out. Compared with theoretical results, the damping force and dynamic stiffness increase with the increase of the applied current and excitations. Besides these, the energy dissipated performance can be improved by the pre-compression. When the initial pressure increases to 5 MPa with the fixed frequency of 10 Hz, the energy dissipation is increased by 43.5%. So the pre-compression is an effective way to solve the high frequency hardening. Besides these, the derived critical model can predict the performance of MR damper at different excitations.
An angle sensor based on a sector ring patch antenna for bolt loosening detection
Authors: Wan Chunfeng , Zheng Zhiquan , Xue Songtao , Xie Liyu , Wan Guochun 
Published: February 2022

Abstract
This paper presents an angle sensor based on a sector ring patch antenna (SRPA) for loose bolt detection. The sensor is comprised of two parts, a ring substrate sandwiched between a ground plane and a sector ring radiation patch, and a sector ring substrate covered by a radiation patch. The two radiation patches are partially overlapped and the overlapped areas are in contact allowing the electric current to flow within the combined radiation patch. The resonant cavity theory is adopted to explain the relationship between the frequency shift and the overlapped angle. The Ansoft high frequency structure simulator software is used to simulate SRPA, and the dimensional parameters of the antenna are optimized to make the antenna perform better. For verification, two sets of SRPAs are fabricated and tested.
Production and attenuation of cosmic-ray boosted dark matter
Authors: Xia Chen , Xu Yan-Hao , Zhou Yu-Feng 
Published: February 2022

Abstract
Light sub-GeV halo dark matter (DM) particles up-scattered
by high-energy cosmic-rays (CRs) (referred to as CRDM) can be
energetic and become detectable by conventional DM direct detection
experiments. We perform a refined analysis on the exclusion bounds
of the spin-independent DM-nucleon scattering cross section
σχ p in this approach. For the exclusion lower bounds,
we determine the parameter of the effective distance Deff
for CRDM production using spatial-dependent CR fluxes and including
the contributions from the major heavy CR nuclear species. We obtain
Deff≃ 9 kpc for CRDM particles with kinetic energy
above ∼ 1 GeV, which pushes the corresponding exclusion
lower bounds down to σχ p∼ 4×
10-32 cm2 for DM particle mass at MeV scale and below.
For the exclusion upper bounds from Earth attenuation, previous
estimations neglecting the nuclear form factor leaded to typical
exclusion upper bounds of σχ
p∼𝒪(10-28) cm2 from the XENON1T
data. Using both the analytic and numerical approaches, we show that
for CRDM particles, the presence of the nuclear form factor strongly
suppresses the effect of Earth attenuation. Consequently, the cross
section that can be excluded by the XENON1T data can be a few orders
of magnitude higher, which closes the gap in the cross sections
excluded by the XENON1T experiment and that by the astrophysical
measurements such that for the cosmic microwave background (CMB),
galactic gas cloud cooling, and structure formation, etc..
Suppression of Stokes heating processes and improved optomechanical cooling with frequency modulation
Authors: Bao Yang , Liao Qinghong , Zhao Qingmin , Wu Jing 
Published: February 2022

Abstract
Ground-state cooling of mesoscopic mechanical objects is still a major challenge in the unresolved-sideband regime. We present a frequency modulation (FM) scheme to achieve cooling of the mechanical resonator to its ground-state in a double-cavity optomechanical system containing a mechanical resonator. The mean phonon number is determined by numerically solving a set of differential equations derived from the quantum master equations. Due to efficient suppression of Stokes heating processes in the presence of FM, the ground-state cooling, indicated by numerical calculations, is significantly achievable, regardless of whether in the resolved-sideband regime or the unresolved-sideband regime. Furthermore, by choosing parameters reasonably, the improvement of the quantum cooling limit is found to be capable of being positively correlated with the modulation frequency. This method provides new insight into quantum manipulation and creates more possibilities for applications of quantum devices.
Gonioreflectometer for measuring 3D spectral BRDF of horizontally aligned samples with traceability to SI
Authors: Lanevski Dmitri , Manoocheri Farshid , Ikonen Erkki 
Published: February 2022

Abstract
Present article describes a 3D gonioreflectometer developed at Aalto University for the measurement of spectral bidirectional reflectance distribution function (sBRDF) of horizontally aligned samples, needed to study sBRDF of sand from satellite calibration test sites. The new set-up incorporates three motorized arms that allow to measure in- and out-of-plane sBRDF. Illumination of the sample is provided by a supercontinuum laser coupled with laser line tunable filters and detection is performed with two types of photodiodes (Si and InGaAs) enabling collection of sBRDF in the spectral range from 450 nm to 1700 nm. The instrument is operated in the relative mode and its traceability to SI is achieved with the help of a 2D absolute reference gonioreflectometer available at Aalto University. The calibration procedure as well as system’s uncertainty estimation are described. The performance of the 3D gonioreflectometer is validated by measurements of a ceramic diffuse reflectance sample.
Real-time modeling and feature extraction method of surface electromyography signal for hand movement classification based on oscillatory theory
Authors: Xiao Feiyun , Mu Jingsong , Lu Jieping , Dong Guangxu , Wang Yong 
Published: February 2022

Abstract

Objective. Research of surface electromyography (sEMG) signal modeling and feature extraction is important in human motion intention recognition, prosthesis and exoskeleton robots. However, the existing methods mostly use the signal segmentation processing method rather than the point-to-point signal processing method, and lack physiological mechanism support. Approach. In this study, a real-time sEMG signal modeling and separation method is developed based on oscillatory theory. On this basis, an sEMG signal feature extraction method is constructed, and an ensemble learning method is combined to achieve real-time human hand motion intention recognition. Main results. The experimental results show that the average root mean square difference value of the sEMG signal modeling is 0.3838 ± 0.0591, and the average accuracy of human hand motion intention recognition is 96.03 ± 1.74%. On a computer with Intel (R) Core (TM) i5-8250U CPU running Matlab 2016Rb, the execution time for the sEMG signal with an actual duration of 2 s is 0.66 s. Significance. Compared with several existing methods, the proposed method has better modeling accuracy, motion intention recognition accuracy and real-time performance. The method developed in this study may provide a new perspective on sEMG modeling and feature extraction for hand movement classification.
Effect of fast electron transport on neoclassical tearing mode stabilization by electron cyclotron current drive
Authors: Wang Xiaojing , Zhang Yang , Zhang Xiaodong , Hu Liqun , Liu Haiqing 
Published: February 2022

Abstract
Recent studies have shown that the stabilization of neoclassical tearing modes (NTMs) by electron cyclotron current drive (ECCD) in ITER may be impeded when the injected electron cyclotron wave beam is broadened by plasma density fluctuations. This paper starts with the analysis of NTM stabilization by ECCD using the modified Rutherford equation (MRE). It is shown that with a wide wave deposition, the most effective approach for mode stabilization is to apply modulated ECCD early during the mode growth when the magnetic island is small, as expected. Numerical simulations based on reduced magnetohydrodynamic equations have been further carried out, and the results show the same trend as those obtained from the MRE. However, the perpendicular transport of fast electrons, taken into account in numerical simulations, is found to significantly degrade the mode stabilization by modulated ECCD. The modulated driven current required for mode stabilization is proportional to the square root of the perpendicular diffusivity of fast electrons and is increased by several times when the diffusivity reaches the anomalous transport level due to plasma turbulence. If the radial misalignment of the driven current from the resonant surface reaches ∼4% of the plasma minor radius, the mode stabilization can be degraded to a great extent, depending on the wave deposition width and the perpendicular diffusivity of fast electrons.
Intensive agriculture, nitrogen legacies, and water quality: intersections and implications
Authors: Ilampooranan Idhayachandhiran , Van Meter Kimberly J , Basu Nandita B 
Published: February 2022

Abstract
More than a century of land-use changes and intensive agriculture across the Mississippi River Basin (MRB) has led to a degradation of soil and water resources. Nitrogen (N) leaching from the excess application of fertilizers has been implicated in algal blooms and the development of large, coastal ‘dead zones’. It is, however, increasingly recognized that water quality today is a function not only of the current-year inputs but also of legacy N within the watershed—legacy that has accumulated in soil and groundwater over decades of high-input agricultural practices. Although attempts have been made to quantify the extent to which soil organic nitrogen (SON) is being sequestered in agricultural soils with intensive fertilization, improved residue management, and the adoption of conservation tillage practices, the controls on accumulation dynamics as well as linkages between legacy N accumulation and water quality remain unclear. Here, we have used the process-based model CENTURY to quantify accumulation and depletion trajectories for soil N across a range of climate and soil types characteristic of the MRB. The model was calibrated against crop yield data and soil N accumulation data from a long-term field site. Model runs highlighted that under current management scenarios, N accumulation is greatest in regions with the highest crop yield, and this can be attributed to the higher residue rates with greater yields. We thus find that humans, through management practices, have homogenized spatial patterns of SON across the landscape by increasing SON magnitudes in warmer and drier regions. Results also suggest a regime shift in the relationship between soil organic N and N mineralization fluxes, such that N fluxes are greater now than in the 1930s, despite similar soil organic N magnitudes, mainly due to higher proportions of labile, unprotected soil organic matter. This regime shift leads to elevated N leaching to tiles and groundwater in landscapes under intensive agriculture.
Continuous frames in tensor product Hilbert spaces, localization operators and density operators
Authors: Balazs P , Teofanov N 
Published: February 2022

Abstract
Continuous frames and tensor products are important topics in theoretical physics. This paper combines those concepts. We derive fundamental properties of continuous frames for tensor product of Hilbert spaces. This includes, for example, the consistency property, i.e. preservation of the frame property under the tensor product, and the description of the canonical dual tensors by those on the Hilbert space level. We show the full characterization of all dual systems for a given continuous frame, a result interesting by itself, and apply this to dual tensor frames. Furthermore, we discuss the existence on non-simple tensor product (dual) frames. Continuous frame multipliers and their Schatten class properties are considered in the context of tensor products. In particular, we give sufficient conditions for obtaining partial trace multipliers of the same form, which is illustrated with examples related to short-time Fourier transform and wavelet localization operators. As an application, we offer an interpretation of a class of tensor product continuous frame multipliers as density operators for bipartite quantum states, and show how their structure can be restricted to the corresponding partial traces.
The Impact of Train Operation Time with Ground Borne Vibration Induced by Railway Traffic
Authors: Lazi M K A M , Adnan M A , Sulaiman N 
Published: February 2022

Abstract
Ground-borne vibration caused by rail transport has detrimental effects on residential areas along the railway tracks. The residents who are subjected to daily ground-borne vibration may also experience more severe health issues over the long term. This involves the mental well-being of the people who live nearby. The efficiency and quality of life of residents may also theoretically be impaired by direct exposure to ground-borne vibration caused by trains. As the government decided to invest further in public infrastructure, especially in the railway transport system, the railway transport system in Malaysia is changing to a higher level. Complaints about human discomfort and irritation caused by the ground-borne vibrations created by rail transport have been reported to increase as a result of the expansion of coverage for rail transport. Many previous studies have investigated the influence of different parameter variables on ground-borne vibrations. The ground-borne vibrations are considered as the dependent variable by some of the inquiries, and the other parameters are classified as independent variables. However, depending on the nature and source of the study performed, the results of the independent variables will differ from the researchers. This analysis aims to examine one of the variables which is the train operating hour in terms of peak and non-peak hours against the ground-borne vibrations caused by the train using local conditions.
Application of Alternative Filler in Asphalt Mixture: An Overview from Indonesia Perspective
Authors: Maha M R A , Idham M K , Hainin M R , Naqibah S N , Amirah N A 
Published: February 2022

AbstractA good quality and proper quantity of filler material is one of the significant factors in producing asphalt mixture. Many studies have been highlighted waste material as an alternative filler to improve asphalt mixture performance. Hence, this paper reviewed the performance of asphalt mixture using rice husk ash (RHA) as filler in terms of the Marshall properties. It shows that 6% RHA by weight of total aggregate was commonly used and depicted better in Marshall properties than the others. This study also found that the RHA can be used to replace up to 100% of the conventional filler. Even though, higher RHA content could significantly reduce the stability yet it still within the acceptable range and could be applied at medium traffic load road. In return, the higher the RHA content the more waste material can be utilized for road construction. Thus, minimized the usage natural source materials.
Durability of POFA-modified dense-graded cold mix asphalt
Authors: Usman K R , Hainin M R , Satar M K I M , Warid M N M , Bilema M A , Usman A , Zulfiqar A J 
Published: February 2022

Abstract
Cold mix asphalt (CMA) is a versatile and energy efficient mixture often prepared at ambient temperature. Efforts to improve the performance of CMA mixtures recorded appreciable success. Nonetheless, the critical performance measures of moisture and abrasive resistance still baffles researchers. Additionally, CMA’s design, production, testing, and site application is bedevilled by slow rate of strength gain, high void content, and absence of a globally acceptable mix design. This study aimed at assessing CMA’s durability measures using the modified Lottman (moisture damage) and Cantabro tests by adding a 3% palm oil fuel ash (POFA) as filler replacement and 3% cement. Fast-curing mixtures fabricated with a cationic quick-set (CQS-1h) and a rapid-set (RS-1K) emulsion both of medium viscosities with a nominal maximum aggregate size (NMAS) of 4.75 mm were evaluated. In addition to improving the Marshall volumetric properties, POFA’s inclusion is aimed at improving adhesion thereby enhancing the durability of the fine dense-graded cold mix asphalt (FGCMA-4.75 mm). The modified Marshall as stated in the asphalt institute (AI) manual series (MS-19) for dense-graded CMA was used for design. Results indicated that POFA reduces the void, improves stability, and enhance durability. Moreover, the CQS-1h has better durability for both control (FGCMA-C) and POFA-modified mixtures (FGCMA-P). While RS-1K has higher tensile strength in both dry and moisture-conditioned states with a higher tensile strength ratio (TSR) for both FGCMA-C and FGCMA-P mixtures. POFA’s pozzolanic capability proves effective in improving the durability and moisture damage resistance of FGCMA-P.
Utilization of Conch Shell Waste and Sugar Cane Dregs as Filler Substitutes in Concrete Asphalt Mixtures
Authors: Veranita  , Andi Y , Rahmat D 
Published: February 2022

Abstract
Aceh province is an area that has very diverse natural resource potentials, such as rivers and extensive plantations. In the river sector, we can find many types of animals that live in water, one of which is a freshwater conch. In plantation areas we often encounter sugar cane plants. Both of these wastes have not been used properly and only become waste. Therefore, this study aim to use conch and sugarcane as a filler material for the asphalt mixture. The addition of filler conch and sugar cane was made in 3 variations, namely 60:40; 50:50, and 25:75. The number of test objects for the first stage of testing was 45 specimens and the second stage was 18 specimens. The results obtained are the optimum asphalt content for 3 variations, namely 6.5%; 6.25%, and 6.5%. The second stage of testing obtained durability values in the three variations, namely 98.72%, 94.83%, and 106.45%. From the three filler variations, it can be concluded that the 25:75 variation has a higher durability value and good stability value. The conclusion of the three variations of conch shell filler and sugarcane is suitable for heavy traffic because it still meets General Bina Marga 2018 specifications.
Review of Runway Pavement Monitoring
Authors: Sholichin I , Ahyudanari E , Muntini M S 
Published: February 2022

Abstract
Research on runway pavement is very local, meaning that it is strongly influenced by the quality of the material, the quality of implementation in the field and the climate in which the runway is built. In Indonesia, there are not many runway pavement studies. On the other hand, most airports in Indonesia only have one runway. If there is any damage, the airport should be closed. Based on these conditions, it is necessary to research the behaviour of runway pavement. On the other hand, research on runway pavement has been widely carried out in several developed countries. This study examines various existing studies to be used as a methodology in similar research in Indonesia. A review of the runway behaviour research is carried out by identifying the methodology related to using sensors to describe the pavement reaction in accepting the load. These methods were evaluated to assess their possible application in Indonesia. With the obtained results related to the pavement behaviour monitoring method, it is hoped to provide an initial step to identify runway pavement behaviour in Indonesia.
Rainfall-Induced Hydraulic Properties for Unsaturated Soil in Klang Valley
Authors: Kechik F A , Izham I S , Ibrahim A , Hassan Z A , Mukhlisin M , Matlan S J , Kasim N 
Published: February 2022

Abstract
Klang Valley area is one of the most landslide-prone areas in Malaysia, especially at Hulu Kelang, Kuala Lumpur. The area has been frequently hit by landslide since 1990s. Soil instability is agreed by researchers occurred due to high precipitation and long duration of rainfall which cause property damage and leading to injury and fatality. Slope failure is also triggered by the antecedent rainfall leads to infiltration of rainwater into soil. Therefore, study of rainwater infiltration is vital to relates soil – water interaction and soil behaviour for varies of rainfall intensities and duration for unsaturated soil. The objective of this paper is to determine and compare soil water characteristic curve (SWCC) which is one of the soil hydraulic parameters for Klang Valley area. Samples were collected to determine the soil hydraulic properties at Hulu Kelang area, Universiti Kebangsaan Malaysia (UKM) and Universiti Pertahanan Nasional Malaysia (UPNM) campuses. SWCC was obtained by pressure plate extractor apparatus experiment and the analysis was performed using Van Genuchten equation. Result of parameters obtained shows significant differences of soil at Hulu Kelang area compared to soils at UKM and UPNM campuses. This research is relevant to supports national slope master plan 2009-2023.