bluuebunny/crossref_metadata_2025 huggingface dataset:
A new model for rehabilitation training: a compliant driven hand exoskeleton design
Authors: Liu Hongxin
Published: December 2022

Robot-assisted rehabilitation for limb dysfunction caused by stroke is one of the key research topics today. Some researchers have found that the structure and driving mode of the exoskeleton will produce physiological deviation during training. Therefore, this paper will explore a kind of mechanical exoskeleton with optimized structure and suitableness for the characteristics of the human hand. This paper analyzes and improves the function and composition of the exoskeleton by investigating the physiological structure and movements of human hands. Based on the DH parameters of the model and the relationship between mechanical geometry, the motion trajectory is simulated with MATLAB to verify its motional realizability. The simulation results show that the manipulator can safely realize the movement in line with the characteristics of the human hand, and its installation and alignment can adapt to different human hand sizes. The inverse dynamics analysis of the model with the Jacobin matrix will promote the design of dynamics and control functions of the model.
Analysis and Research of Water Sprays in Civil Aircraft
Authors: Liu Ming
Published: December 2022

In the process of designing a new type of civil aircraft, the main manufacturer needs to obtain the type certificate, including the water spray test. Using the method of engineering estimation at the beginning of the design, we can effectively find the potential design problems in the initial stage and reduce the risk of subsequent tests. This paper studies water sprays under different runway water depths, tire parameters and speeds, obtains the basic track of the water sprays and determines the risk of the water sprays in compliance of civil aircrafts. It finds out the causes of the water sprays, analyzes them, and guides the model design.
Research on Testing and Calculation Analysis of Cargo Bay Fire-Extinguishing Agent Concentration Based on Different Loading in Civil Aircraft
Authors: Kou Hongfei
Published: December 2022

In the history of international aviation, there have been many fire accidents of the cargo compartment. To ensure that the fire is extinguished in time when the cargo compartment is on fire, and to ensure the safety of aircraft and personnel, the design of the cargo compartment fire extinguishing system needs to be verified according to CCAR 25. According to the AC851-1 guidance, the verification of the cargo compartment's fire extinguishing system design aims to test and calculate the concentration of fire extinguishing agents used for the C-class cargo compartment based on different loading conditions of civil aircraft. Through the flight test of the cargo compartment under a no-load condition, it can be seen that the concentration of fire extinguishing agents in the cargo compartment is higher than 5% in the initial phase, higher than 3% in the 39,000ft and 10,000ft level flight phase, and the entire flight test phase is maintained above the suppression concentration required by the test, which meets the system design requirements. The concentration of fire extinguishing agents in the cargo compartment under a no-load condition is calculated and analyzed according to the maximum load rate (full load), and the result is higher than the required 3% suppression concentration.
Function Design of Civil Aircraft Brake System Based on Model
Authors: Huang Renyu , Li Haomin
Published: December 2022

In view of the practical problems in aviation field, such as increasingly complex systems and relationships among systems, great uncertainty in cross-industry and multi-discipline, traditional systems engineering is gradually weak. In this paper, combined with the functional architecture design of civil aircraft brake system, model-based systems engineering (MBSE) is introduced. In this paper, the function of civil aircraft brake system is defined and analysed by this method, and the functional architecture model of civil aircraft brake system is built through repeated iterations, and the state switching logic among system functions is presented digitally to ensure the clarity, comprehensiveness and reliability of the functional architecture.
Shock Train Leading Edge Detection Method under the Condition of Steady Back Pressure and Fluctuating Back Pressure
Authors: Tian Mengyang , Zhao Meng , Liu Xinyi , Liu Zhiju , Yang Yaojia , Liu Xinyu , Xiong Bing
Published: December 2022

In this paper, the shock train in the isolator is taken as the research object, and the method of detecting the leading edge position of the shock train during self-excited oscillation and forced oscillation is studied by conducting the wind tunnel test. A steady-state throttling system and a fluctuating throttling system are designed to apply the required steady-state and fluctuating back pressure downstream of the isolator. Then, the four methods of pressure ratio method, pressure difference method, standard deviation method, and Fast Fourier Transform (FFT) analysis method are used to detect and study the position of the shock train leading edge under steady and fluctuating back pressure to verify their applicability. The results show that under the condition of steady-state back pressure, the four methods can get effective results, and the results are consistent. Under the condition of fluctuating back pressure, the pressure difference method could not give effective results, but the other three methods could give effective and consistent results. And the results of the standard deviation method and the Fast Fourier Transform analysis method are similar in image and principle.
Research and Verification on the Solution of Bleed Air Temperature Deviation of Civil Aircraft Pneumatic System
Authors: Peng Danqi
Published: December 2022

The pneumatic system of civil aircraft is equipped with a precooler (PCE) to cool the high-temperature bleed air from the engine to meet the design requirement of a downstream user system. The PCE is usually a fork-flow heat exchanger. This heat exchange structure will make the outlet temperature difference especially large, which shall lead to the deviation of the inlet air temperature of the downstream wing anti-icing system and air conditioning system and cause the temperature of bleed air supplied to the wing anti-ice system unstable. During a flight test of a certain large passenger aircraft, it was found that the bleed temperature at the PCE outlet was lower than the piccolo inlet temperature of the wing anti-ice system when the wing anti-ice system was operated with two engine bleed systems on. This paper creatively proposes design ideas for the three kinds of mixers and determines the solution of adding a mixer downstream of the PCE to solve the temperature deviation problem. The mixer is installed at the hot side outlet of the PCE and used to mix the temperature field at the PCE outlet so that the air supplied to the downstream customer systems meets the design temperature requirements. According to the simulation calculation and laboratory test verification results, the design scheme of a certain large passenger aircraft is selected, which has successfully solved the problem of temperature stratification at the outlet of the PCE and supported the follow-up flight test.
Research on Beam Waveguide Focus Phase Calibration Method of Deep-space TT&C System
Authors: Xu Xiaofei , Hu Hongjun , Fu Shuhong , Yan Yalong
Published: December 2022

The angle auto-tracking capability is needed in the deep space system, but in the sum-differential dual channels tracking model, the deep-space TT&C system must calibrate its phase before tracking a satellite. Because of the big aperture and high frequency of the deep-space TT&C system antenna, it is impossible to build a calibrating tower which satisfy the far-field condition, and the traditional phase calibration method relies on the tower is not suitable. The radio star calibration method selects a appropriate satellite as the calibrating signal source, but the signal of which is very weak and is affected easily. In this paper, the principle of phase calibration is analyzed, and the beam waveguide focus calibration method is studied, the processes of antenna tracking and angle error signal demodulation are given. The beam waveguide focus calibration method simulates the far field signal through controlling the position of horn antenna which is at the focus of the beam waveguide. The method can be realized easily in engineering, and the limit of the traditional calibration tower and the affections of the weather in using radio star calibration method are avoided.
GIS-based Ecological Risk Assessment on Land Use In Chongqing City, China
Authors: Wang Ziyue
Published: December 2022

Ecological risk assessment (ERA) is a process of predicting the possibility of harmful effects of environmental pollutants on an entire or part of the ecosystem, which is closely connected with the early human health risk assessment. A rational assessment of ecological risks in an urban area can provide great significance for urban landscape pattern optimization, urban ecological risk warning mechanism establishment, and urban ecological environment risk reduction. This study is based on GIS system to assess the ecological risk of land use in Chongqing in 2020, according to the basic theoretical framework and method system of ecological risk assessment. The main process is using remote sensing image data to construct the Ecological Risk Index (ERI) from the perspective of landscape patterns to reflect the potential impact of resource-based urban land use on the ecological environment. In addition, the ArcGIS spatial analysis method was used to evaluate Chongqing's ecological risk. As a result, high-risk area close to the water body just occupied a small part of Chongqing City (around 5%) and this area should be taken into protective measures urgently.
Research on the Application of Small Area 3D Modeling Based on Consumer UAV—Take DJI Yu-2 UAV as an Example
Authors: Teng Zhan , Liu Wanqing , Yi Yaowu
Published: December 2022

The use of UAVs for geographic information mapping is a relatively mature technology. It has the advantages of a large measurement range, fast data collection speed and high efficiency. It is gradually becoming an important technical means that can partially replace traditional field measurement. 3D modeling of UAV image data is an important aspect of UAV surveying and mapping applications. Under the current background of “real China” and “digital twin”, UAV modeling will have very broad application prospects. The current UAV modeling is mainly based on large fixed-wing UAVs or professional rotary-wing UAVs, but their prices are relatively high, so this paper tries to use a relatively low-priced consumer-grade UAV-DJI Yu 2, the professional version of the UAV performs image control-free 3D modeling without ground control points and analyzes the accuracy of the results to verify its applicability in geographic information data collection.
Analysis of Integrated Navigation Technology Based on GNSS/UWB
Authors: Tian Ye , Zhou Lejie , Ji Xu
Published: December 2022

Aiming at the problem that a single positioning system cannot meet the indoor and outdoor high-precision positioning, GNSS/UWB integrated navigation system is proposed. Firstly, this paper introduces the development and research status of the global satellite navigation system; Secondly, The UWB positioning technology in indoor positioning technology is introduced; Finally, the development and research status of GNSS/UWB integrated navigation are introduced. The advantages and disadvantages of the single outdoor or indoor positioning system in the indoor and outdoor integrated navigation system are compared and analyzed. The results show that a single outdoor or indoor positioning system cannot meet the indoor and outdoor high-precision positioning, an effective method of GNSS/UWB fusion positioning is to improve the positioning accuracy and robustness, which can enhance the real-time in time, continuity in space and reliability in accuracy.
Research on the Construction Method of Remote Sensing Sensing Information Platform Based on Internet of Things
Authors: Zhou Hong
Published: December 2022

With the gradual rise and development of Internet of Things technology, the development of related industries has shown new vigor and vitality. From the definition and application of the Internet of Things and remote sensing monitoring, the application fields of the combination of the Internet of Things and remote sensing monitoring are given a specific description. On the basis of analyzing the research status and technology at home and abroad, using VS. NET method to build a three-layer network platform to realize the construction of the information platform, and verify the application of the information platform is better.
The Identification of Key Nodes in Aviation Networks
Authors: Chen Bin , Wang Yingming
Published: December 2022

Identifying key nodes of aviation networks is a challenging and valuable issue, which depends on the measurement and ranking of node importance. Node importance can be measured statically according to certain network topology characteristic. The efficiency of this method is high. Node importance can also be measured dynamically according to certain network dynamic process. The result measured by this method is more accurate and reasonable. The current situation of this research is systematically described. The future trend of this research is revealed as well.
Crucian carp position and pose recognition based on an improved photo-model method
Authors: Wen Changyi , Wang Jirong , Dai Xiangwu , Li Jun
Published: December 2022

This research aimed to solve the problem of fish position and pose recognition in the process of robot grasping fish. Crucian carp is the subject of this research and studies the position and pose recognition algorithm of crucian carp by photo-model-based stereo-vision. This research aims at the problem that the fitness algorithm has a poor effect in identifying photo models with more black and white information, this research proposes an improved fitness algorithm. The new fitness algorithm uses the improved HSV model and adds the Saturation and Value to the evaluation value of the original fitness algorithm. Then Real-Time Multi-step Genetic Algorithm (RM-GA) is used to verify the improvement effect of the fitness algorithm. We use the improved algorithm for experiments. The findings indicated that the peak fitness is significantly improved, with an average increase of about 95%. At the same time, the position and posture recognition error of crucian carp is reduced by more than 50%, and the real-time performance of the algorithm is improved.
Signal acquisition analyzer based on MSP432
Authors: Yue Chenyang , Xu Guoyuan , Yue Gangzheng , Sun Yanzhe , Mi Zhiyu
Published: December 2022

The system is based on digital signal processing technology, takes MSP432P401R single-chip microcomputer as the main controller, uses the on-board ADC to convert the input signal into a digital signal, and then carries out FFT transformation to obtain the amplitude of each harmonic component, so as to carry out spectrum analysis and calculate THD/ THDo/ Δ values for further signal processing. The system realizes the signal processing and the calculation of distortion and distortion measurement error and expands the functions of calculating the normalized amplitude of the fundamental wave and harmonic and recovering the input signal waveform. Distortion measurement error value Δ ≤3%, can process signal amplitude range 30mV~600mV, fundamental frequency range 1kHz~100kHz, and the calculation and processing time is less than 10 seconds.
Parameter Measurement Method of PD Radar Based on Non-coherent Accumulation
Authors: Wang Cong , Hu LongBiao , Fan MengQiu , Yang Qiu
Published: December 2022

With the improvement in the anti-reconnaissance performance of the new system radar, the signals sent by the radar are more and more difficult to be detected, which brings new challenges to electronic reconnaissance. In order to find the enemy earlier, the receiver usually needs high sensitivity to detect weak signals. Therefore, according to the characteristics of airborne PD radar pulses, a method of PD radar parameter measurement based on non-coherent accumulation is proposed, which is of great significance to improve the receiver sensitivity. In this paper, the main peaks’ solution of PD Radar spectrum after non-coherent accumulation and the method of pulse parameter measurement are introduced in detail. Finally, the effectiveness of this method is verified by simulation experiments.
An adaptive noise removal method for EEG signals
Authors: Chu Ruibo , Wang Jian , Zhang Qian , Chen Huanhuan
Published: December 2022

EEG signals are the response to the electrophysiological activity of brain nerve cells in the cerebral cortex, but the collected EEG signal generally contains noise. In order to effectively remove the noise and retain useful information, after research and analysis, this paper proposes an improved EEG noise-removing algorithm based on the threshold method where wavelet contraction is used. The improved adaptive threshold selection algorithm makes it possible that the threshold changes with the number of layers of decomposed signal, so it can be applied flexibly in practice. The wavelet transform is used to decompose the EEG signal into multiple layers of high- and low-frequency coefficients. Adaptive threshold processing is then applied to the wavelet coefficients in accordance with the various decomposition levels, and the scaled wavelet coefficients are then reconstituted to produce the denoised EEG signal. Using the Root Mean Square Error (RMSE) and Signal Noise Ratio (SNR) as quantitative measures of the denoising effect Through trials, the improved threshold method, hard and soft threshold method, and adaptive threshold method were contrasted. The experimental findings demonstrate that the wavelet shrinkage-based improved threshold approach has a better denoising effect than the other three threshold methods.
Main lobe interference suppression by FDA-MIMO radar based on a novel log function frequency offset
Authors: Lv Jihui , Xue Jinghong
Published: December 2022

Frequency diverse array (FDA), which can be combined with Multiple-input-Multiple-output (MIMO) to improve the performance of system, and the range information provided by FDA-MIMO radar provides a new idea for suppressing main lobe interference. However, the periodicity of the angle-range two-dimensional beam pattern also causes some safety hazards to the radar beamforming process. When the interference is located in the grating lobe of FDA-MIMO radar, the related algorithm of beamforming will appear serious distortion. The traditional nonlinear frequency offset method to remove the periodicity of the beam pattern will cause the problem of large main lobe width. In this paper, a new log function frequency offset is proposed, which can not only achieve the periodic removal of the FDA-MIMO radar beam pattern but also has a narrower main lobe bandwidth of 3dB compared with the traditional nonlinear frequency offset method
A high dynamic weak spread spectrum signal acquisition strategy based on the transfer model
Authors: Yang Fan , Meng Zhijun , Wang Guangming , Guo Xiye , Yan Enqi , Zhang Yufeng
Published: December 2022

To solve the problem of low Earth orbit (Leo) satellite constellation link spread spectrum signal acquisition in the high dynamic weak environment, this paper proposes a acquisition strategy based on transfer model. In this paper, we analyze the dynamic characteristics of link signal. An improved method of parallel code phase search acquisition based on transfer model acquisition strategy is introduced, the improvement of the proposed acquisition strategy to the traditional acquisition algorithm is illustrated through theoretical analysis. Simulation results verify the superiority of the acquisition strategy based on the transfer model for high dynamic weak signal acquisition.
Main lobe interference suppression method of Skywave OTHR based on fast-time STAP
Authors: He Tao , Sun Guangjun , Ding Shujuan
Published: December 2022

For the sky-wave over-the-horizon radar (OTHR), how to effectively suppress the radio frequency interference (RFI)from the main-lobe direction is a problem. To solve this problem, this paper proposes a new space-fast time adaptive processing (fast-time STAP) which merges the matched filter coefficients used for pulse compression and the time steering vector of fast-time STAP. To compare with conventional methods, the method improves the match between the space-time steering vector of fast-time STAP and the real target signal, while the RFI and the noise from RFI are effectively suppressed by the interference-plus-noise covariance matrix which is composed of raw data. At the same time, the signal-to-noise ratio is improved. Compared with the traditional method, this method can be better applied to practical engineering. The results of computer simulation and experiments with real radar data verify the effectiveness of the proposed method.
Design of Occupational Accident Prevention System for Transportation Vehicles Based on TOF
Authors: Zhu Xuebin , Wang Zhoulin , Su Jiang
Published: December 2022

This paper proposes a system concept to prevent work accidents caused by vehicles transporting goods within a particular space. Furthermore, the system uses image processing methods to avoid these accidents. This is meant to allow the system to calculate motion vectors for all objects in the vehicle's path, so such a design can predict possible collisions. In addition to this, additional person detection has a higher priority, enabling a two-stage warning. This way, collisions endangering people can be warned earlier than collisions with other obstacles.
Programmable logic controller memory management vulnerability analysis
Authors: Geng Yangyang , Ma Rongkuan , Wei Qiang , Wang Wenhai
Published: December 2022

Programmable logic controller (PLC) is omnipresent in industrial control system (ICS), which plays an imperative part in critical infrastructures. However, once a PLC is compromised by an attacker, it will create destructive effects on critical infrastructures. The memory systems in PLCs are considered significant targets for attackers to disrupt real-world physical processes. In this paper, we proposed five types of attacks on the PLC memory management mechanism. Furthermore, we evaluated the feasibility of our memory attack generation approach on six PLCs from three leading controller vendors. A total of 22 memory attack payloads are implemented with several vulnerabilities on the target PLCs.
A Robust Beamforming Suppressing Deceptive Jamming Method Based On FDA-MIMO Radar
Authors: Zhang Yimeng , Li Wenxing , Yang Bin , Zhao Yu
Published: December 2022

In comparison to phased array (PA) radar that just transmits a beampattern with angle-dependent, frequency diverse array (FDA) radar with adding a feature of distance dimension performs well in main-beam deceptive jamming suppression domain. However, in practical conditions, estimating an inaccuracy of the covariance matrix(CM) has a significant negative impact on algorithm performance, also as a mismatch of target SV has. Hence, a robust adaptive beamforming technique comes up in this article that selects the principal eigenvector to get accurate signal steering vectors (SV), further gets the reconstruction interference-plus-noise CM (IPNCM). According to experiments, the proposed algorithm keeps a robust and good performance under non-ideal circumstances.
Multi-target tracking algorithm based on YOLO+DeepSORT
Authors: Chen Yuntao , Wu Bin , Luo guangzhi , Chen xiaoyan , Liu junlin
Published: December 2022

After several years of development, the multi-target tracking algorithm has significantly transitioned from being researched to being put into practical production and life. The application field of human detection and tracking technology is closely related to our daily life. In order to solve the problems of the background complexity, the diversity of object shapes in the application of multi-target algorithms, and the mutual occlusion between multiple tracking targets and the lost target, this paper improves the DeepSORT target tracking algorithm, uses the improved YOLO network to detect pedestrians, inputs the detection frame to the Kalman filter for prediction output, and then uses the Hungarian algorithm to realize a tracking frame and detection frame of the predicted output. The experimental results show that target tracking accuracy is increased by 4.3%, the running time is the shortest, and the number of successfully tracked targets is relatively high.
SAR Autofocus Algorithm of iterative error compensation based on PGA
Authors: Hou Xiaoze , Ma Yanheng
Published: December 2022

This paper proposes a motion compensation algorithm based on PGA. Our algorithm first uses the PGA algorithm to estimate roughly the phase error of the SAR data, which is then exploited through several iterations to compensate for the phase error and the range migration caused by the motion error to obtain a focused SAR image. A single iteration not only improves the image quality, but also improves the motion error compensation accuracy of the PGA algorithm in the next iteration. The simulation and measured data show that the algorithm can effectively compensate the motion error with fast convergence speed, good SAR image focusing effect and high error compensation accuracy.
Time Difference of Arrival Estimation of Stationary Targets Utilizing Deep Neural Network
Authors: Xie Wupeng , Liu Guanghong , Xiang Xiaoxiao , Xing Kang , Zhang Xiaojuan
Published: December 2022

Time difference of arrival (TDOA) is widely used in the field of passive location because of its flexible base station deployment and simple principle. However, when solving the solution of stationary targets position, the traditional method, such as the two-stage weighted least squares (TSWLS) algorithm, is easily affected by noise, and cannot achieve good localization results in practical situations. To solve this problem, we propose a deep neural network (DNN) for TDOA estimation of stationary targets. First, a large number of simulation samples are generated according to the TDOA model. Each sample contains the time difference from each secondary base station to the main base station, the error of time difference, and the real three-dimensional (3-D) coordinates of the targets. Next, a suitable DNN architecture is designed to solve the solution of the stationary target position. The simulation results prove that the method proposed herein outperforms TSWLS for multiple base stations based on the TDOA model.
Characterization of the photo-detection efficiency temperature dependence of silicon photomultipliers from -30°C to 70°C
Authors: Schmailzl Wolfgang , Piemonte Claudio , Schelhase Stefan , Hansch Walter
Published: December 2022

We present photon detection efficiency (PDE) measurements of three different silicon photomultipliers (SiPM) and report the temperature coefficient of this parameter using a direct measurement method.
This study provides first results in such a wide temperature and wavelength range, from
-30°C to 70°C and from 365 nm to 900 nm respectively.
To carry out this study we developed a setup providing stable illumination of the device under test in temperature.
The PDE is evaluated using a photon-counting method and the wavelength-dependent PDE temperature coefficients of all devices are determined.
The different designs are compared and the individual contributors to the temperature dependence of the PDE are discussed.
The PDE is shown to be linearly dependent on temperature for all designs and the temperature coefficient depends on wavelength and bias voltage.
At shorter wavelengths, the temperature dependency approaches values close to zero for one design whereas all devices show increasing temperature coefficients for increasing wavelengths.
This study shows that despite the more complex designs of SiPMs, compared to silicon photodiodes, similar factors contribute to the temperature dependence of the PDE.
Operation modes of the KATRIN experiment Tritium Loop System using 83mKr
Authors: Marsteller Alexander , Böttcher Matthias , Bornschein Beate , Enomoto Sanshiro , Fengler Caroline , Lebeda Ondřej , Machatschek Moritz , Priester Florian , Ráliš Jan , Röllig Marco , Röttele Carsten , Schlösser Magnus , Michal Šefčík , Sturm Michael , Vénos Drahoslav
Published: December 2022

The KArlsruhe TRItium Neutrino (KATRIN) experiment aims to search for the effective electron antineutrino mass with a sensitivity of 0.2 eV (90 % C.L.).
In order to achieve this goal, KATRIN measurement phases focusing on the neutrino mass search are alternated with phases of investigations of systematic effects.
During these phases, metastable 83mKr is used as a calibration source.
The monoenergetic conversion electrons emitted accompanying the decay of 83mKr allow a direct access to the starting conditions of β-electrons produced inside the windowless gaseous tritium source (WGTS) of KATRIN.
To make use of 83mKr in the WGTS, the Tritium Loop System, which provides a stable flow of tritium to the WGTS, needs to be operated in special modes.
This paper focuses on the technical implementation of these modes and their performance with regard to the achievable 83mKr-rates, gas densities, and gas compositions inside the WGTS.
Improved bunching and longitudinal emittance control in an RFQ
Authors: Jameson Robert A. , Yee-Rendon Bruce
Published: December 2022

A new application of vane modulation variation in a Radio Frequency Quadrupole (RFQ) cell has been applied that significantly improves beam bunching and longitudinal emittance control to achieve lower longitudinal rms emittance at the RFQ output. This procedure occurs in the individual cells, is independent of the overall design, and therefore is general, affording an extra parameter for beam manipulation. It can be applied besides the usual goals of vane modulation variation, e.g., to achieve higher acceleration efficiency. Examples of the cumulative effects on the overall design are provided to point out further exploration avenues for the designer.
Non-intrusive inspection of cargo containers using the C-BORD Rapidly Relocatable Tagged Neutron Inspection System
Authors: Pino F. , Fontana C.L. , Nebbia G. , Carasco C. , Pérot B. , Sardet A. , Poli J.P. , Sebert A.G. , Sannié G. , Iovene A. , Tintori C. , Sibczynski P. , Grodzicki K. , Swiderski L. , Slegt M. , de Goede R. , Moretto S.
Published: December 2022

The European H2020 project, entitled “effective Container inspection at BORDer control points” (C-BORD), aims to develop a framework of Non-Intrusive Inspection (NII) technologies,
for containers and large-volume freight at the EU borders. In this article the first results of the
field trials of the Rapidly Relocatable Tagged Neutron Inspection System (RRTNIS) are reported.
The tests were carried out at the customs administration of the Netherlands' (DCA) facility in the
seaport of Rotterdam, the Netherlands. For the tests mock-up cargo containers were prepared. The containers were analyzed using the whole set of NII subsystems of the C-BORD framework. Each container underwent a session of subsequent scans with all the subsystems, in order to realistically
reproduce the normal flow of inspections at the customs facility. The RRTNIS was tested under these realistic conditions, as well. The system was able to separate and identify the target materials, in mock-up containers, and improve the state-of-the-art in terms of the detected quantities.
Subseasonal swing of cold and warm extremes between Eurasia and North America in winter of 2020/21: initiation and physical process
Authors: Ma Shuangmei , Zhu Congwen
Published: December 2022

Eurasia and North America experienced a robust subseasonal swing of surface air temperature (SAT) extremes in 2020/21 winter, featuring severe cold (warm) extremes over Eurasia before (after) 15 January and conversely over North America. This sharp subseasonal swing of intercontinental cold and warm extremes exerted considerable severe impacts on human activities and the global economy. Here we examined the initiation and physical process based on data analyses. Our results show annual cycle (AC) anomalies of SAT caused this subseasonal alternating of temperature extremes in two regions. The AC anomalies of SAT are regulated by the phase transition of the North-Pacific-Oscillation-like (NPO-like) circumglobal Rossby wave (CRW) train. Unprecedented warming sea surface temperature over midlatitude Northwest Atlantic in early winter initiated a positive phase of the NPO-like CRW train, via eddy-mediated physical processes and the resultant feedback of sea ice loss over the Barents-Kara Seas. While, the subsequent downward feedback of stratospheric processes resulted in the negative phase of the NPO-like CRW pattern in late winter. This work advances the understanding of the subseasonal predictability of SAT extremes from impacts of AC anomalies and intercontinental seesawing.
On higher-dimensional superintegrable systems: a new family of classical and quantum Hamiltonian models
Authors: Rodríguez Miguel A , Tempesta Piergiulio
Published: December 2022

We introduce a family of n-dimensional Hamiltonian systems which, contain, as special reductions, several superintegrable systems as the Tremblay–Turbiner–Winternitz system, a generalized Kepler potential and the anisotropic harmonic oscillator with Rosochatius terms. We conjecture that there exist special values in the space of parameters, apart from those leading to known cases, for which this new Hamiltonian family is superintegrable.
Tensile Strength and Water Absorption of Oil Palm Mesocarp Fiber Reinforced Polyester Composites: Effect of Volume Fraction of Fiber
Authors: Bakri Bakri , Naharuddin  , Mustafa  , Seleng Kristian , Chandrabakty Sri , Iqbal Muhammad , Asmara Anjar , Hasan Ardiansyah , Safitri Azizah Ayu
Published: December 2022

Oil palm fiber has been developed for application of composite reinforcement. This fiber can be produced from the fruit of oil palm like mesocarp and empty fruit bunch fibers. In this paper, the oil palm mesocarp fiber used as reinforcement of composite was focused on the variation of volume fraction of fiber in the composite related to tensile strength and water absorption properties. The variation of volume fraction of fiber includes 10%, 20%, 30% and 40%. The unsaturated polyester was used as a matrix. Prior to the use of fiber, it was immersed in sodium bicarbonate (NaHCO3) with 12wt % during 120 hours. Composite fabrication method is hand lay-up with compression molding. The composite samples were tested by the tensile and water absorption tests. Then, the fracture of tensile test was analyzed by scanning electronic microscopy (SEM). The result shows that the tensile strength of composite increases with increase in the volume fraction. Meanwhile, the percentage of water absorption decreases with rise in the volume fraction.
Recovery and Improvement of Cocoa Production With the Use of Nutrients from Chitosan-Tonnage Blending Ash
Authors: Suherman  , Sabang Sri Mulyani , Rahmawati Sitti , Supriadi
Published: December 2022

Cocoa is one of the plantation crops that provide a high economic contribution to Central Sulawesi Province in particular and Indonesia in general and be the main income for local farmers. Cocoa is a non-oil and gas export commodity with high demand, therefore the government has determined cocoa as a strategic commodity that needs to be increased in productivity and developed as a source of income for Indonesia and State of Sulawesi. The purpose of this study was to make chitosan-tonnage blending in the composition of 80%-90% and to characterize it and its optimal ratio to restore soil nutrients, so the plants can be resistant to pests and Vascular Streak Dieback (VSD). Furthermore, cocoa fruit were powdered to become as raw material for bispic products. Chitosan come from chitin, with shrimp as raw material, tonnage was cocoa pods which have been hit by black fruit borers. Cocoa plants come from a less productive farmer area of 1 Ha, located in Rantekala Village, Gumbasa District, SigiBiromaru Regency. The results of this study revealed that of the cocoa fruit diameter which is given nutrient elements from chitosan-blending ashesat fruit age ± 6 weeks was 23 cm, compared with the cocoa fruit diameter that only given ZA / NPK fertilizer was 14.5 cm at the age of 7 weeks. The length of the cocoa fruit that was given nutrient elements from chitosan-blending ash blending at ± 6 weeks fruit age was 28 cm, while the cocoa fruit that was given ZA fertilizer only was 21 cm in length at 7 weeks. The production of cocoa beans which were given nutrient elements with chitosan-tonnage blending ashes increased by 60% compared to those that were only given ZA fertilizer. The conclusion from this study was the nutrients from chitosan-tonnage blending ash could be increase the size of the cocoa fruit around 37% for diameters and 27% for lengths greater than those given with ZA fertilizer.
Growth and survival of Banggai cardinalfish (Pterapogon kauderni, Koumans 1933) reared with artificial microhabitat
Authors: Artayasa I K S , Manabanti M S , Karimullah  , Sari D E , Ndobe S
Published: December 2022

The Banggai cardinalfish (Pterapogon kauderni), endemic to the Banggai Archipelago (Central Sulawesi), has been declared the Indonesian National Marine Ornamental Fish Mascot. Sea urchins (Diadema sp.) are a key P. kauderni microhabitat. The decline of urchin populations due to harvesting for human consumption has adversely affected P. kauderni populations. The purpose of the study was to develop artificial microhabitat from environmentally friendly materials (coir and cement) and to determine the effectiveness of this artificial microhabitat in terms of fish growth and survival. The research was conducted in July 2021 at the Water Quality and Aquatic Biota Laboratory, Tadulako University. Two treatments were used (P. kauderni with live urchin microhabitat = BBA; P. kauderni with artificial microhabitat = BBB) with 8 replicates. T-test analysis showed net growth in weight differed significantly (p<0.05) between treatments (higher in BBA), as did survival rate (higher in BBB), while net growth in length did not differ significantly. Based on the results, it was concluded that the sea urchin-like artificial microhabitat developed could be effective as a surrogate P. kauderni microhabitat, at least in a controlled environment, and shows promise for supporting the conservation of P. kauderni. The next stage will be trials in the natural environment.
Assessment of forest road network alternatives in forest harvesting activity
Authors: Malik A , Santi N A
Published: December 2022

One of timber harvesting purposes is moving wood from the forest to sawmills. Road network planning requires consideration for alternatives. This paper purposed to determine decision-making in the selection of alternative road networks with utility analysis by considering economic, ecological, and social criteria. The indicator used were the length of the road, open area, cost of road construction, felling, skidding, and empowerment of forest communities. The analysis showed that the first alternative was the best forest road network of the three alternatives designed. The results are used in the decision-making plan for implementation in the next rotation.
Performance analysis of breadth-first search and depth-first search on MANET for health monitoring system
Authors: Alamsyah  , Amir A , Subito M , Fauzi R , Amirullah
Published: December 2022

The development of mobile ad-hoc network (MANET) technology is increasing and is directly proportional to the need. MANET is a wireless network consisting of several nodes moving freely and without using the infrastructure. MANET can be applied in various fields such as the military, natural disasters, and health services. The health sector, especially the health monitoring system, gets more attention because it involves maintaining patient safety. However, wireless devices installed in health services have not been able to reach patients. This condition causes the required time and energy consumption to increase. Therefore, the breadth-first search (BFS) and depth-first search (DFS) methods are indispensable in determining the quality of service (QoS) in MANET. QoS parameters analyzed include packet delivery ratio (PDR), throughput, packet loss, delay, and energy consumption. This study aims to choose a health data traffic route that can improve QoS when transmitting data. The simulation results using the 2018 version of MATLAB show that BFS has a better performance than DFS on delay and energy consumption parameters. Meanwhile, DFS has better performance than BFS on PDR, throughput, and packet loss parameters.
Etnochemistry Study of Medicine Plants for Liver Disease in The Community of Balane Village
Authors: Ningsih Purnama , Ijirana Ijirana , Mulyani Sri , Patanda Frischilia Febby
Published: December 2022

Based on their ethnochemical expertise, the study intends to find the types, sections of plants, processing methods, and ways of use used to treat the liver ailment in the community of Balane village, Kinovaro District, Sigi Regency, Central Sulawesi. A qualitative research method was used, which included interview techniques. To treat liver disorders, the Balane community uses six distinct types of herbs. Cakar ayam (Selaginella doederleinii Hieron), daun sendok (Plantago major L.), jarong (Stachytarpheta indica (L.) Vahl), pegagan (Centella asiatica (L.) Urban.), sambiloto (Andrographis paniculate (Burm. F) Wallich), temulawak (Curcuma zanthorrhiza Roxb.). Plant parts that are used as medicine include herbs, leaves, rhizomes, and grains. Boiling is used to prepare the medicinal herbs, and the treatment is used for 1-3 months or until the patient notices a difference or recovers.
The Relationship Between Pesticide Exposure and Hypertension Incidence on Paddy Farmers in Dolago Padang Village, Central Sulawesi
Authors: Salikunna NA , Kurniawan A , Fitriana Y , Ramadhan MZ
Published: December 2022

Hypertension is one of the leading causes of death in the world, including Indonesia. Pesticide exposure is one of the risk factors for hypertension. This study aims to determine the relationship between the length of work of farmers, the amount types of pesticides used, the time of spraying pesticides and the use of PPE on the incidence of hypertension. The research subjects were 80 paddy farmers who participated in this study, voluntarily. Blood pressure have been measured by sphygmomanometer. The other data has been collective by interview. The statistical analysis test used the chi square test. The results showed that there was a relationship between the length of work of farmers, the amount types of pesticides used, the time of spraying pesticides with the incidence of hypertension (p value < 0.05). There is no relationship between the use of PPE with the incidence of hypertension (p value > 0.05). The conclusion of this study is that there is a relationship between pesticide exposure and the incidence of hypertension in farmers in terms of length of work, the amount types of pesticides used and the time of spraying pesticides.
Potential of Liquifaction at Nasanapura Hospital Petobo Village Palu City
Authors: Rahayu A , Uno I I , Hidayat N , Dwijaka A , Yusuf M
Published: December 2022

The liquefaction event that occurred in Petobo Village, Palu City, Central Sulawesi, was caused by the Palu earthquake on September 28th, 2018 with a magnitude of 7.4 and a depth of 10 km. This study aims to determine the characteristics of the soil and also whether the area still has the potential for liquefaction based on the Test Swedish Weight Sounding (SWS), and Cone Penetration Test (CPT). The test is carried out at a location that is the limit of the cessation of liquefaction, which has a variety of soil types. Determination of soil characteristics is carried out by laboratory tests, Sieve Analysis and Atterberg Limits. The results of laboratory testing, the soil types at point A are poorly graded sand and silty sand (SP-SM). As for the results of SWS at point D the soil with an Nsw value of more than 180.00 n/m is at a depth of 3.68 m with a Nsw value of 274.73 n/m. From the results of the CPT calculation it was found that the soil at Point E at a depth of 0.80 m – 6.40 m has potential for liquefaction and soil at a depth of 6.60. m – 8.40 m no liquefaction potential.
Beach protection model in Palu Bay coastal area post tsunami 2018
Authors: Setiyawan  , Saparuddin  , Vera WA , Fildawati Y , Wisnu W
Published: December 2022

Talise Beach is a coastal area that has the potential of marine products and also as a means of tourism for the local community. Recently, Talise Beach and several areas along Palu Bay have experienced a lot of erosion by the impact of waves that threaten Country Road (Trans Sulawesi), settlements and other public places as a result of the earthquake and tsunami that occurred in 2018 with a wave height of 3-4 m which resulted in erosion and retreating of the coastline and even damaged several main road infrastructure and several other public facilities. The erosion problem is handled by constructing a Revetment-type coastal protection along the Talise Beach. The purpose of this study was to determine the height of the waves at Talise Beach, then to plan the technical design of the coastal protection structures at Talise Beach and to calculate the shear stability of the planned buildings. To test the stability of the Revetment, secondary data are needed in the form of wind data for 10 years (2011-2020), land contour data and tidal data for sea water and waves that are observed directly in the field. The results obtained from the calculation are the Hs is 4.466 meters, Ts is 4.5 seconds, the elevation of the lighthouse is 4.8 meters, the design water level elevation is 2.494 m. The revetment that is built consists of 3 layers using the main material is crushed stone.
Study Activities of Street Vendors in The Utilization of Space in Tatanga District, Palu City (case study: I Gusti Ngurah Rai Corridor)
Authors: Awalia Rezki , Saleh Rachmat , Achsan Andi Chairul , Astha Dwinsani Pratiwi , Chistin Dara Maria R
Published: December 2022

Street vendors (PKL) are included in the activities of the informal sector. Street vendors have the characteristic of buying and selling goods on the roadside or sidewalks. The presence of street vendors in the I Gusti Ngurah Rai Corridor is due to the low number of job opportunities, resulting in competition in finding work. Through this phenomenon, this study aims to study the activities of street vendors in the use of space. This research uses the Univariate (Proportion) analysis method. The results of the research related to the characteristics of street vendors in the corridor were 53% with >15-30 years, dominated by women; high school education level; 87% came from Palu City; 26% trading experience > 5 years and type of family-owned business and 36% income > 500,000-1 million. The activity of street vendors in this corridor is 60% dominated by consumer goods with a linear distribution pattern; 56% Static trading facility type; 50% of trading facilities in the form of containers/kiosks and semi-static service characteristics; 88% of street vendors occupy trading locations on the street and 52% on average 5-8 hours of trading time. The main factor in choosing a street vendor business location is close to consumers.