bluuebunny/crossref_metadata_2025 huggingface dataset:
Dynamic response of the mooring system in the floating photovoltaic power station
Authors: Yu Fei , Su Yi , Liu Yuliang , Liu Haibo , Duan Fei
Published: November 2021

The floating photovoltaic power (FPV) station becomes popular to decrease carbon emission. However, limited research has been done on the dynamic response of the mooring lines of the FPV array. Based on a typical 2.14MW FPV array, this study investigates the displacement of the array and the mooring tension of the mooring lines. The numerical model of the FPV array is built through three-dimensional potential theory with 124 mooring lines. Firstly, the effect of the environment on the response is investigated under wave-only, current-only and wind-only conditions. Then, the tension and motion in the combined environmental loads are analyzed. It is found that the wind load has the greatest influence on the motion and mooring tension on the FPV power station, the effect of wave and current on the response is very limited.
Study on Frequency Regulation of Energy Storage for Hydropower Station
Authors: Jiang Yun , Wan Yuan , Pan Pingheng , Fu Liang , Zhang Xinhua , Shi Zhineng , Wang Pei
Published: November 2021

The paper firstly proposes energy storage frequency regulation for hydropower stations. Taking the actual operating hydropower station as an example, it analyzes the necessity of configuring energy storage to participate in frequency regulation for hydropower stations, and according to the hydropower station AGC regulate situation, the battery capacity of the energy storage frequency regulation system is designed, and the frequency regulation performance of the energy storage frequency regulation system at different battery capacities is analyzed. It provides reference for hydropower stations with similar needs.
Influence of Mooring Tension on Dynamic Performance of Semi-submersible Wind Turbine under Typhoon Condition
Authors: Zhang Liwei , Sun Zhi , Qiu Boyuan , Hou Yilie , Li Xin
Published: November 2021

A numerical model of a 5 MW semi-submersible wind turbine is established based on the reference wind turbine of American national renewable energy laboratory (NREL). The nominal diameter of the mooring chains was determined after the static wind load and wave load of the turbine under the action of typhoon being calculated by CFD method and Morison method. Finally, the dynamic responses of the turbine and the internal forces of the chains are obtained by the dynamic finite element analysis for three cases. The results show that when pretension chains are used, the turbine motion frequency is consistent with wave frequency, the surge is small, the pitch is reciprocally symmetrical, and the peak internal force of the chains is quite high. When mooring chains without pretension are adopted, the motion of the turbine consists of low-frequency drift and forced motion in sync with the wave frequency, the pitch is asymmetrical, and the internal tension force of the chains is relatively low.
Optimization of Corona Ring Design Used in UHV Composite Insulator by PSO Algorithm
Authors: Zhang Shiling
Published: November 2021

The three-dimensional model for the V and I type composite insulators used in AC 1000kV single-circuit tangent power transmission tower has been established, and conducted E-field calculation in FEM software, the results show that maximum electric field strength of corona ring used in V type insulator is about 13.9% and insulator surface 29.2% higher than that of I type, thus corona ring structure should be further optimized. So PSO algorithm has been implemented, meanwhile, submodeling technique was also used to solve such large calculation amount problem due to complexity of used model which can effectively reduce calculation amount without lose of accuracy. Then the method combining FEM and PSO algorithm has been applied to corona ring structure multi-parameter optimization used in V and I type insulators, finally, maximum E-field located in surface of ring and insulator shed can meet the electric control value, and no corona discharges can be observed when corona rings were used in actual project. The method proposed in the paper can solve structure optimization problem for large field domain and multi-media complex model, meanwhile, have reference value for researching field of insulation structure optimization with PSO algorithm.
Design of a High-precision 5V/10V DC Voltage Reference Source
Authors: Yang Yubo , Meng Jing , Yao Wenbo
Published: November 2021

This paper introduces a self-developed DC voltage source, which uses the Zener reference LTZ1000 as the voltage reference element. Selecting high precise resistors and using appropriate measures to insulate and isolate, the short—time relative stability of 7V output voltage provided by LTZ1000 is 1.5×10-8. The voltage of 10V is increased up by a network, composed by high precise resistors with the same temperature coefficient, and its short—time relative stability is 2.2×10-8. The voltage of 5V is divided by a network, composed by high precise resistors with the same temperature coefficient, and its short—time relative stability is 3.6×10-7. The circuit is suitable for signal acquisition, voltage calibration and other applications.
INVESTIGATION OF CONJUGATED HEAT TRANSFER FOR A RADIAL TURBINE WITH IMPINGEMENT COOLING
Authors: Zhang Han , Chen Hua , Ma Chao , Guo Feng
Published: November 2021

Radial turbine is widely used in micro-turbines, turbochargers, small jet engines and expanders, and the pursue of high system efficiency has resulted in elevated turbine inlet temperatures for some of its applications, threatening its reliability. There are, however, few cooling studies on radial turbines. This paper studies the jet impingement cooling of a turbocharger radial turbine. A small amount of air (coolant), which could come from compressor discharge cooled by an intercooler, is injected through a few jet holes on the heat shield of the turbine onto the upper part of turbine backdisc, to cool the rotor blades and the backdisc. Parameters that may affect the cooling were studied by a Conjugated Heat Transfer (CHT) numerical simulation using steady flow calculations. The influences to the cooling effects by different coolant-to-turbine mass flow ratios, Coolant-to-turbine inlet temperature ratio, number of the jets etc. were analysed by a steady flow simulation. The simulation results show that, when four jet holes are placed at blade leading edge radius, using 1.0% ~ 3.0% of the main gas mass flow of coolant, the average temperature on leading edge, inducer hub and backdisc surface is reduced by 2K ~ 17K,27K ~ 65K and 51K ~ 70K respectively. Turbine efficiency is mostly reduced little over 1% point.
Centralized on-line monitoring system for pipeline and cable environment and fresh air of air conditioning
Authors: Ye Zhihua , Xu Yudong , Bao Xinchao , Li Zhenghao , Zhang Wei
Published: November 2021

Aiming at the problem of on-line centralized monitoring error of pipeline and cable environment and fresh air of air conditioning, a utility model is designed, a centralized monitoring system of pipeline and cable environment and fresh air of air conditioning is disclosed, the system structure configuration is optimized, and the system performance is improved by combining multiple central air conditioning controllers, data processors, acquisition servers and other equipment, combined with LabVIEW technology, the system software function and operation process are improved. Finally, the experiment proves that the centralized online monitoring system for pipeline and cable environment and air conditioning fresh air can better reduce the monitoring error and ensure the real-time monitoring quality of pipeline and cable environment and air conditioning fresh air.
Design and Performance Analysis of Precision Micro-drive Amplification Mechanism
Authors: Lv Zhenyang , Yang Manzhi , Li Linyue , Wei Kaiyang , Zhang Xiaodong , Gui Haochen , Wang Liang
Published: November 2021

At present, there are shortcomings in the research of micro-drive amplification mechanism, such as insufficient precision and additional force. In this paper, a kind of micro-drive amplification mechanism is designed and its positioning accuracy is simulated. Firstly, a kind of micro-drive amplification mechanism is designed, which can accurately transform the input displacement of piezoelectric ceramic actuator (PZT) into the output displacement of a certain number of amplification. the theoretical motion magnification ratio of the mechanism is 3:1. Secondly, the kinematics and simulation of the mechanism were studied, and the conversion performance of the mechanism was analyzed. The results showed that the micro-drive amplification mechanism has the advantage of high positioning accuracy (maximum positioning error is 4.67%). Finally, through strength analysis and modal analysis, the performance of micro-drive amplification mechanism is studied. This study has some reference value for the research and application of precision micro-drive amplification mechanism.
Theoretical and Experimental Studies on Air-suction Roller-type Precision Seed-Metering Device
Authors: Si Huiping , Zhang Chunyuan , Lin Kaiyan , Wu Yusheng , Wu Junhui
Published: November 2021

The seed-metering device is the key component of a precision seeder. The methods to improve the seed suction and dropping efficiency of air suction drum precision seed metering device were discussed Establishing the force and equation of motion for sucking, carrying and dropping stages, the effect of the seeding parameters on the effect of sucking and seeding is analyzed. Then, the single factor and orthogonal test are carried out on the sucking pressure, the carrying pressure, the rotation rate and the dropping pressure as the experimental factors for the optimization analysis. And the optimum experimental parameters and the predicted values of each test index are obtained. That is, when the seeding pressure of -2.87kPa, the seeding pressure of -1.91kPa, the drum rotation rate of 18.72 r min-1 and the dropping pressure of 1.74kPa, the best effect that the single rate is 93.8%.
Simulation analysis of cooperative motion fuzzy control of distributed lifting units
Authors: Yang Yu , Jin Xing
Published: November 2021

In the technology of hydraulic lifting system, it is not only necessary to ensure that the displacement and velocity accuracy of each hoist reach a certain value, but also to ensure that under the control of load balance to make each hoist smooth lift. In the conventional method, the PID control method can realize the synchronization of the function. However, the system cannot be controlled and adjusted in real time during the control parameter period, resulting in instability and uncertainty of the system. Aiming at this problem, this paper adds the fuzzy adaptive controller to carry out the master-slave control of the system. AMESim and MATLAB co-simulation were used to model the overall model of the hydraulic system. At the same time, the pressure compensator and variable throttle port model in the hydraulic reservoir were selected to build. The pressure compensator is used to keep the pressure difference of the throttle orifice constant, so as to complete the control and design of the hydraulic lifting system. Finally, the simulation results obtained not only can effectively improve the instability of the hydraulic lifting process, but also greatly improve the operation speed of the system.
Research on Control Method of Neutral Point Potential Balance of T-Type Three-level Inverter Based on PLECS
Authors: Liu ZhuoQun , Ma JunChi , Liu KaiXu
Published: November 2021

The T-type three-level inverter topology has the advantages of low electromagnetic interference, high efficiency, and low output harmonic content. This article combines constant power inverter, independent control of active and reactive power output, Analyzed and studied the neutral point potential balance control of the T-type three-level inverter topology. Through PI adjustment control on the amount of charge of the capacitor, the midpoint voltage of the capacitor is always maintained in a balanced state, and the fluctuation of the midpoint voltage is controlled within ±0.23%. This method can effectively avoid the influence of the difference of capacitance parameters on the DC side on the midpoint voltage. The PLECS software simulation verifies the reliability of the capacitor voltage equalization circuit under the condition of the voltage imbalance at the midpoint of the DC side voltage source supply capacitor voltage equalization.
Fixed points and stability of A class of Stochastic dynamical system driven by Brownian motion
Authors: Wang Chun-Sheng , Ding Hong , Tong Ouyang
Published: November 2021

In real life, many models and systems are affected by random phenomena. For this reason, experts and scholars propose to describe these stochastic processes with Brownian motion respectively. In this paper we consider a kind of stochastic Vollterra dynamical systems of nonconvolution type and give some new conditions to ensure that the zero solution is asymptotically stable in mean square by means of fixed point method. The theorems of asymptotically stability in mean square with a necessary conditions are proved. Some results of related papers are improved.
Small-signal modeling and stability analysis of grid-connected offshore wind power based on virtual synchronous generator control
Authors: Dong Lihu , Song Danqing , Chen Zhuo
Published: November 2021

With the increasing installed capacity of offshore wind power, the grid-connected of offshore wind power technology based on virtual synchronous generators (VSG) control can simulate the inertia and damping characteristics of synchronous generator, which is helpful to improve the networking ability and inertial supportability of grid-connected inverter. However, VSG control also inevitably causes system oscillation, endangers the safe and stable operation of the power grid. Hence, the main circuit and control circuit of offshore wind power grid connection are firstly modeled, and the small-signal model of offshore wind power grid-connected inverter based on VSG control is obtained. Then the correctness of the model is verified by Matlab/Simulink software. Finally, the root trajectory method is used to identify the effects of VSG control parameters and line parameters on the system stability. The results show that VSG control has a significant influence on the stability of the grid-connected system, and reasonable design parameters are needed to ensure the safe and stable operation of the power grid.
Research of Visual Synchronous Technology Based Control Method for PMSG Wind Power System
Authors: Xie Dongmei , Li Changjian , Jiang Yanxi
Published: November 2021

Commissioned for wind power system there are two main types of generators, one is doubly fed induction generator(DFIG), the other is permanent magnetic synchronous generator(PMSG). Compared to DFIG unit, PMSG wind power system is more economical for manufacturing and maintenance. With the higher penetration rate of wind power generation in the grid, the need for the renewable power units to provide active frequency support yields relevant control characteristics in their power converters, for which the visual synchronous generator control exhibits promising features. This paper proposes a visual synchronous technology based PMSG wind power system. The simulation results verified the effectiveness of this proposed controller.
A Finite Element Model of Partial Discharge in Solid Medium
Authors: Wang Wenqiang , Shi Zhen
Published: November 2021

The mechanism of partial discharge(PD) is the theoretical basis of the PD detection, insulation monitoring and risk assessment. The finite element analysis of partial discharge is an effective measure to study the characteristics of PD. In this work, a physical model of PD of a gas gap in solid dielectric using finite element analysis (FEA) method has been developed to determine the relationship between the inception electric field with different applied stresses, the cavity diameter and air pressure has been considered as the physical parameters that affect PD characteristics. The change of potential distribution before and after the discharge and the field strength during the discharge are analyzed.
Development and application of measurement data pre-processing tools for parameter identification considering q-axis voltage
Authors: Sun Dunxiang , Cui Lei
Published: November 2021

At present, when model parameter identification is carried out, measurement data from phase measurement units or fault recorders are generally used directly. These two types of devices can directly provide the fundamental positive sequence quantities required for parameter identification, but cannot output the dq components. If these measurement data can be fully utilized for parameter identification, it is very beneficial to improve the model accuracy. In this paper, according to the engineering needs of load model parameter identification, the extraction method and variation law of dq components are studied, and the data pre-processing tool is developed and put into use.
Hydraulic synchronizing lifting steel template based on AMEsim modeling simulation technology research
Authors: Li Dongbei , Wang Shenghui , Jin Xing
Published: November 2021

Steel formwork is used for concrete casting and forming, and plays a key role in the construction of high-rise buildings with asymmetrical large loads. In order to make the inner and outer formwork can be lifted synchronously, the difficult problem of unbalanced inner and outer formwork must also be overcome. According to the synchronization principle of the hydraulic lifting system and the performance parameters of its main components, AMESim model was created and the simulation was done for two hydraulic cylinders bearing the same heavy load and different weight load respectively. Therefore, the synchronization scheme of shunt valve is proposed.
Design and Implementation of Real-time Power Grid WebGIS Visualization Framework Based on New Generation Dispatching and Control System
Authors: He Yuan , Zhang Yuan , Zhang Yaowei , Fang Caishen , Huang Kun , Han Xiao
Published: November 2021

With the strengthening of the integrated characteristics of power grid and the construction of the New Generation Dispatching and Control System with “physical distribution, logical integration”, the demand for global monitoring and analysis of power grid has gradually increased. On the basis of understanding of design of the new generation real-time dispatching and control data platform system, with the principles of componentization and servitization, the real-time power grid WebGIS visualization framework is designed and implemented. And this paper further introduces the design of the front-end secondary development interface and examples, as well as the cartographic generalization of the power grid WebGIS visual map. This framework has successfully supported the construction and online operation of several real-time power grid WebGIS visualization applications.
A Rapid Monte Carlo Reliability Evaluation Method for Integrated Energy Systems Based on Transformer
Authors: Liu Yu , Li Jianfeng , Jiang Tao , Zhang Zixin , Shi Zhe , Yang Bo
Published: November 2021

In this paper, a Transformer-based fast Monte Carlo reliability evaluation method for integrated energy systems is proposed. First, the faults of the system components are sampled and the corresponding minimum cut load amounts are calculated to obtain the sample data for training the machine learning model. Then, Transformer is used as a machine learning algorithm for mining the nonlinear mapping relationship between system component faults and the minimum cut load, and the estimation model of the minimum cut load under different faults is trained. Finally, the model is combined with Monte Carlo simulation method to randomly sample component states, and for each state, the minimum cut load amount is directly given by the trained estimation model, thus realizing fast evaluation of integrated energy system fast reliability. The proposed method is applied to the integrated energy system test case, which verifies its effectiveness.
Research on Defect Detection of Electric Energy Metering Box Based on YOLOv5
Authors: Yu Yong , Sun Yanchao , Zhao Chunxue , Qu Chong
Published: November 2021

The manual inspection for the damage state of the electric energy metering box consumes a lot of time, the workload is large, and the data storage is difficult. In order to solve these problems, this paper proposes an automatic detection method for the damage state of the electric energy metering box based on the YOLOv5 algorithm. The actual metering box pictures taken by the operation and maintenance inspectors are used as the training set, LabelImage is used to annotate the data set, and YOLOv5s model is used to train the data set. The experimental results show that the method proposed in this paper can accurately mark the position of the metering box lid and accurately predict its damage state. The average accuracy reaches 98%, which can meet the requirements for the detection accuracy of the power metering box damage state in the operation and maintenance inspection work.
Numerical simulation of the condensation process in high voltage switchgear based on the temperature and humidity distribution
Authors: Wang Peng , Sun Jingwen , Zhang Pipei , Wang Jiangwei , Zhao Zhonghua
Published: November 2021

The condensation on solid materials surface inside switchgear is an important reason threatening its safety and reliability. The formation of condensation is closely related to the temperature and humidity distribution inside the switchgear. A 3-D simplified finite element calculation model for the switchgear is established, including the bus bar, the wall bushing, the circuit breaker, the cables and other key components. Based on the electromagnetic-temperature-humidity multi-physical field coupling method, the temperature distribution inside the switchgear are calculated when the operating current flows through the bus-bar. Furthermore, the humidity diffusion process is also calculated when the relative humidity of external environment was 0.8, and the relative humidity inside the switchgear is obtained. The calculation results show that the surface humidity of the contact box of the circuit breaker is the highest whereas the temperature is the lowest, which is the location where the condensation is easy to occur.
Research on power system scheduling method based on cross-platform sharing
Authors: Lin FengKai , Li YanRong , Liu YaWei , Chen LingXiao
Published: November 2021

As a large, complex system with wide distribution and high real-time, the safe, stable and reliable operation of the power system is inseparable from the power automation system. In this paper, an in-depth study is conducted on the key issues of this solution in the process of software cross-platform integration around the EPRI graphic center method, combined with the power data interface standard. The dispatch center graphics system and the dispatch center power graphics application method are discussed in detail in the paper. In addition, the paper also explains the online calibration system for relay protection ratings with smart grid dispatching technology support system. The methods and sample systems in this paper have been practically applied in large scale power grid dispatching centers, providing a reliable guarantee for the safe and stable operation of the power grid.
Analysis of current characteristics of transformer bias caused by subway stray current based on measured data
Authors: Wang Zezhong , Wu Junling , Liu Lianguang , Li Yuyan , Chen Lu , Guo Zhiguang
Published: November 2021

The metro stray current, as the driving source which causes the magnetic bias of the urban network transformer, has the characteristics of rapid change, complex propagation path, and many influencing factors.It’s unknown where the stray current leaks from, and its specific value cannot be obtained through measurement methods.Therefore, this paper studies the characteristics of transformer neutral magnetic current bias based on the measured data and fault recording data in the process of measurement, and analyzes the influence of stray current on transformer in urban network.
Research on Recognition and Location Method of Insulator in Infrared Image Based on Deep Learning
Authors: Huang Hua , Huang Yongxi , Mu Xiaojing , Wang Xiaozhou
Published: November 2021

Infrared thermography technology is widely used in the thermal condition detection of insulators due to its advantages of non-contact, sensitive, online detection. To realize the automatic detection of the operating condition of insulators in complex environments, this paper proposes a method for the recognition and location of the insulator based on Region-based Fully Convolutional Networks (R-FCN). The model was trained and tested on the constructed insulator infrared data set, compared with the SSD model. The results showed that the R-FCN detecting insulators can not only accurately locate insulators, but have an AP (average precision) value as high as 89.2%. Therefore, the findings in this paper have verified that R-FCN has great advantages in the recognition and location of infrared images of insulators and has practical application value.
Edge detection of foreign matter suspension image of high voltage transmission line based on improved Canny operator
Authors: Lin Yongjian , Liu Kanglin , Wei Baorong , Wei Yantai , Long Kaiyuan
Published: November 2021

In the edge detection of foreign object hanging image of high voltage transmission line, it is easy to appear that multiple responses will appear at one image edge point, which affects the detection effect. Based on the improved Canny operator, an edge detection method for foreign matter suspension image of high voltage transmission line is designed. The collected image is preprocessed in three steps: gray processing, optical correction and noise reduction, so as to better reflect the characteristics of the original image and improve the image quality. The non-uniform distribution of potential energy of foreign body hanging image data field is used to locate the image area of foreign body hanging. The morphological filter can extract the local noise and make the image clearer. The Canny operator is improved to obtain the partial derivative of the distance measurement function and automatically update the threshold to eliminate the multi-level response. The test results show that the method in this paper is better than the image edge detection method based on Canny operator and Sobel operator in three indexes: positive detection rate, false detection rate and missed detection rate.
Digital comparative analysis of simulation results of radioactive deposition field of nuclear explosion
Authors: Liu Yunlong , Geng Xiaobing , Xu Mei
Published: November 2021

The radioactive settlement of nuclear explosion is simulated by Lagrange particle diffusion model. The simulated settlement map and the measured data map are digitally extracted into the same format. The effectiveness measurement (MOE) method and normalized absolute difference (NAD) method are used to conduct numerical comparative analysis between each dose simulation area and the measured area.
Research and application of graphic software architecture for power grid dispatching control system
Authors: Fang CaiShen , Lv Zhimeng , He Yuan , Peng Hui , Huang Kun , Han Xiao , Yan Zhen , Xu Hua
Published: November 2021

Currently, the independent design and development of power grid automation system cannot meet the urgent requirements of integrated system for electric dispatching, monitoring and synthetic analysis and decision-masking. In accordance with this situation, a general power grid dispatching control graphics software architecture based on the modular hierarchical theory is proposed. The architecture extracts and abstracts the common modules of different system graphics software architectures to build an integrated basic development platform. Based on this platform, an integrated graphical interactive software for power grid dispatching, power distribution network or substation supervision can be quickly developed. In this paper, the overall architecture, modular hierarchical theory, graphics general API and the key technologies for this architecture are described in detail. This architecture has been applied to the development of multiple power grid control graphics software, and the engineering application is performing well in reality. In a word, the architecture proposed in this paper satisfies the needs of power grid control integration, and effectively reducing system
Progress on Feynman Integrals for 2 → 3 scattering at NNLO
Authors: Canko D D , Kardos A , Papadopoulos C G , Smirnov A V , Syrrakos N , Wever C
Published: November 2021

We present recent results on two-loop five-point Feynman Integrals with one off-shell leg that are relevant to the study of many 2 → 3 scattering processes of interest at the LHC, especially for the leading-colour W + 2 jets production. The calculation is based on the Simplified Differential Equations approach.
Progress on 2—loop Amplitude Reduction
Authors: Bevilacqua G , Canko D D , Kardos A , Papadopoulos C G
Published: November 2021

We collect results on 2-loop 2 → 3 amplitude reduction computations and discuss the progress done for the upgrade of the HELAC framework, in order to be able to compute 2—loop scattering amplitudes.
Search for physics beyond the standard model in final states with two or three soft leptons and missing transverse momentum in proton-proton collisions at

s=13

TeV
Authors: Papavergou Ioanna , Vourliotis Emmanouil
Published: November 2021

The most recent CMS results from a search for supersymmetry (SUSY) with a compressed mass spectrum in leptonic final states will be presented. The search is targeting signatures with missing transverse momentum and two or three low-momentum (soft) leptons. The dataset used is collected by the CMS experiment during the Run–2 proton-proton collisions at

s

=
13

TeV at the LHC, and corresponds to an integrated luminosity of up to 137 fb−1. The observed data are found to be in agreement with the Standard Model prediction and exclusion upper limits are set on the SUSY particles production cross section. The results are interpreted in terms of electroweakino and top squark pair production. In both cases, a small mass difference between the produced SUSY particles and the lightest neutralino is considered. A wino-bino and a higgsino simplified models are used for the electroweakino interpretation. Exclusion limits at 95% confidence level are set on

x
˜

2
0

/

x
˜

1
±

masses up to 280 GeV for a mass difference between the

x
˜

2
0

/

x
˜

1
±

and the lightest neutralino of 10 GeV for the wino-bino production. In the higgsino interpretation

x
˜

2
0

/

x
˜

1
±

masses are excluded up to 210 GeV for a mass difference of 7.5 GeV and up to 150 GeV for a mass difference of 3 GeV. The results for the higgsino production are additionally interpreted in terms of a phenomenological minimal SUSY extension of the standard model, excluding the higgsino mass parameter μ up to 180 GeV for bino mass parameter M1
= 800 GeV. Upper limits at 95% confidence level are set on the top squark pair production interpretation, excluding top squark masses up to 530 GeV in the four-body top squark decay model and up to 475 GeV in the chargino-mediated decay model for a mass difference between the top squark and the lightest neutralino of 30 GeV.
The Micromegas Surface Commissioning For the ATLAS New Small Wheel
Authors: Kourkoumeli-Charalampidi Athina , Fassouliotis Dimitrios
Published: November 2021

In order to cope with the required precision tracking and trigger capabilities from Run III onward in the ATLAS experiment, the innermost layer of the Muon Spectrometer end-cap (Small Wheels) will be upgraded. Each of the two New Small Wheels (NSW) will be equipped with eight layers of MicroMegas (MM) detectors and eight layers of small-strip Thin Gap Chambers (sTGC), both arranged in two quadruplets. MM detectors of large size (up to 3m2) will be employed for the first time in HEP experiments.

Four different types of MM quadruplet modules (SM1, SM2, LM1, LM2), built by different Institutes, compose the NSW. The modules are then sent to CERN, integrated into double wedges (DW), tested and sent for commissioning on the wheel itself. At the commissioning stage the MM double wedges along with the sTGC wedges are assembled together into sectors which are then installed and tested on the wheel. Each wheel comprises 8 small (made of SM1 and SM2 modules) and 8 large (made of LM1 and LM2 modules) sectors, in order to provide full coverage of the end caps.

The first of the two wheels (NSW-A) has been fully commissioned, installed in ATLAS and the first tests are currently ongoing. The second wheel (NSW-C) is currently under commissioning and is expected to be ready by October this year.
Construction and operation of large scale Micromegas detectors for the ATLAS Muon upgrade
Authors: Maniatis I. , Sampsonidis D. , Lampoudis Ch. , Manthos I. , Petridou Ch. , Tzamarias S.E. , Kordas K. , Dima K. , Kallitsopoulou A. , Kalaitzidou I. , Karkanias I. , Kompogiannis S. , Maznas I. , Maragkou E. , Tsopoulou M. , Paschalias P. , Koutsosimos T. , Tsiafis I.
Published: November 2021

After the forthcoming upgrade of the LHC accelerator at CERN, its luminosity will increase up to 7.5 × 1034 cm−2s−1. That will raise the readout rates and the background data to unmanageable levels for the existing ATLAS muon spectrometer. The ATLAS collaboration has proposed to replace the present small wheel muon detector with the New Small Wheel (NSW) to surpass those limitations. The new wheels consist of Micromegas (MM) and small-strip Thin Gap Chambers (sTGC). The first technology aims for precision tracking, and the last one for trigger purposes. Each wheel will be equipped with eight small and eight large sectors, while each sector will have a double MM wedge surrounded by sTGC wedges. The MM detectors for the NSW will be the largest developed Micro Pattern Gaseous Detector (MPGD) as they will cover an area up to 1280 m2. During detectors’ manufacture have been used various custom materials (PCBs, mesh) and innovative construction techniques. This paper describes the MM drift panels production at Aristotle University of Thessaloniki laboratory. Then will be presented resolution results of the MM detectors with cosmic-ray tests at CERN facilities.
Methods used for Gas Tightness Test and percent Oxygen Monitoring of the NSW Micromegas Detectors of LHC-ATLAS Experiment
Authors: Alexopoulos T. , Gazis E. N. , Maltezos S. , Koutelieris G. , Koutsoupi S. , Tzanis P. , Tzanos S. , Vlachos S.
Published: November 2021

In the frame of the LHC-ATLAS Upgrade of phase I, the New Small Wheel detector system is under integration and commissioning at CERN Laboratories. One of the detector type, the Micromegas detectors, during their integration are tested in several stages for gas tightness validation. In particular, the novel method we are using for the gas tightness test, that we called “Flow Rate Loss”, has been realized in several semi-automatic fixed, portable and stand-alone setups for testing either the Micromegas Quads or the final Double Wedges. The obtained measurements up-to-date are presented as well as their obtained statistical distribution. Additionally, during the performance evaluation of the detectors, a percent oxygen monitoring is also performed in 24-hour base. The methods and techniques we developed and used are presented analytically in this work.
A program to drive the ATLAS Local Trigger Interface (ALTI) at the ATLAS experiment
Authors: Trantou Foteini
Published: November 2021

During the High Luminosity upgrade of the Large Hadron Collider at CERN, the LHC experiments will undergo a series of upgrades in order to maintain high physics performance following an increased data rate. The largest Phase 1 upgrade project at the ATLAS muon system is the replacement of the current inner station (end-cap regions) with the New Small Wheels. In addition, the ATLAS Local Trigger Interface (ALTI), a part of the Timing, Trigger and Control (TTC) system, will replace the four existing TTC modules. In normal operation, the detectors, along with the surrounding electronics, will receive TTC related signals from the Central Trigger Processor (CTP). This information is forwarded to the front-end electronics of each of the ATLAS sub-detectors through an optical network via the ALTI. The interface currently produces an artificially generated pulse pattern that contains the TTC information. This paper will summarize the creation of a program that generates pulse pattern files which are used to drive ALTI. Various tests have been conducted in order to study the performance of the NSW trigger electronics while using these files. Software development and data analysis using ROOT framework were used to validate the results of these tests.
The Detector Control System for the magnetic field sensors in New Small Wheel phase I upgrade of ATLAS detector
Authors: Tzanos Stamatios
Published: November 2021

In conjunction with the High Luminosity upgrade of the Large Hadron Collider accelerator at CERN, the ATLAS detector is also undergoing an upgrade to handle the significantly higher data rates. The muon end-cap system upgrade in ATLAS, lies with the replacement of the Small Wheel. The New Small Wheel (NSW) is expected to combine high tracking precision with upgraded information for the Level-1 trigger. To accomplish this, small Thin Gap Chamber (sTGC) and MicroMegas detector technologies are being deployed. Due to their installation location in ATLAS, the effects of Barrel Toroid and End-Cap Toroid magnets on NSW must be measured. For the final experiment at ATLAS, each sTGC large double wedge will be equipped with magnetic field Hall effect sensors to monitor the magnetic field near the NSW. The readout is done with an Embedded Local Monitor Board (ELMB) called MDT DCS Module (MDM). For the integration of this hardware in the experiment, first, a detector control system was developed to test the functionality of all sensors before their installation on the detectors. Subsequently, another detector control system was developed for the commissioning of the sensors. Finally, a detector control system based on the above two is under development for the expert panels of ATLAS experiment. In this paper, the sensor readout, the connectivity mapping and the detector control systems will be presented.
The REINFORCE citizen-science project and the search for new long-lived particles at the LHC
Authors: Angelidakis S
Published: November 2021

The REINFORCE project engages and supports citizens to cooperate with researchers and actively contribute to the development of new knowledge for the needs of science and society. The overall aim is to bridge the gap between them, and reinforce society’s science capital. Within this context, the demonstrator titled “New Particle Search at CERN” will engage citizen-scientists in searches for new elementary particles produced in the high-energy proton-proton collisions at the LHC. To make this possible, the demonstrator adopts a three-stage architecture. The first two stages use simulated data from the ATLAS detector to train citizens, but also to allow for a quantitative assessment of their performance and a comparison with machine learning algorithms. The third stage, on the other hand, uses real data from the ATLAS Open-Data subset, providing two research paths: (a) study of Higgs boson decays to two photons, one of which could be converted to an electron-positron pair by interaction with detector material, and (b) search for yet undiscovered long-lived particles predicted by certain theories Beyond-the-Standard-Model.
Increasing cloud water resource in a warming world
Authors: Cheng Jingya , You Qinglong , Zhou Yuquan , Cai Miao , Pepin Nick , Chen Deliang , AghaKouchak Amir , Kang Shichang , Li Mingcai
Published: November 2021

Under global warming, terrestrial water resources regulated by precipitation may become more unevenly distributed across space, and some regions are likely to be highly water-stressed. From the perspective of the hydrological cycle, we propose a method to quantify the water resources with potential precipitation capacity in the atmosphere, or hydrometeors that remain suspended in the atmosphere without contributing to precipitation, namely cloud water resource (CWR). During 2000–2017, CWR mainly concentrates in the middle-high latitudes which is the cold zone of the Köppen classification. In a warming world, CWR shows a significant increase, especially in the cold zone. Climate change with Arctic amplification and enhanced meridional circulation both contribute to the change of CWR through influencing hydrometeor inflow. By studying the characteristics of CWR and its influencing mechanisms, we demonstrate a potential for human intervention to take advantage of CWR in the atmosphere to alleviate terrestrial water resource shortages in the future.
The noncommutative geometry of the Landau Hamiltonian: differential aspects
Authors: De Nittis Giuseppe , Sandoval Maximiliano
Published: November 2021

In this work we study the differential aspects of the noncommutative geometry for the magnetic C*-algebra which is a 2-cocycle deformation of the group C*-algebra of

R

2

. This algebra is intimately related to the study of the quantum Hall effect in the continuous, and our results aim to provide a new geometric interpretation of the related Kubo’s formula. Taking inspiration from the ideas developed by Bellissard during the 80s, we build an appropriate Fredholm module for the magnetic C*-algebra based on the magnetic Dirac operator which is the square root (à la Dirac) of the quantum harmonic oscillator. Our main result consist of establishing an important piece of Bellissard’s theory, the so-called second Connes’ formula. In order to do so, we establish the equality of three cyclic 2-cocycles defined on a dense subalgebra of the magnetic C*-algebra. Two of these 2-cocycles are new in the literature and are defined by Connes’ quantized differential calculus, with the use of the Dixmier trace and the magnetic Dirac operator.
Pedaro formation, equivalent of Plover sandstone at Savu Island, Outer Banda Arc
Authors: Santy L D , Widiatama A J
Published: November 2021

Plover Sandstone have been widely known as a good quality of oil and gas reservoir in NW Australia. As the continuity of NW Australia margin, outer Banda Arc become the distribution area of the equivalent of Plover Sandstone units. Therefore, a clear distinction and characterization of equivalent of Plover Sandstones distributed in this area is needed. Thick unit of quartz rich sandstone is scrap out in south Savu Island. Refers to the location where the lithology is found widely distributed, the unit is suggested to be called as Pedaro Formation. The characteristic of the lithology is determined through detailed measured section from two trajectories and laboratory analysis, including fourteen samples of petrography analysis, eight samples of Scanning Electron Microscope (SEM) analysis, and three samples of X-Ray Difraction (XRD) analysis. The lower part of the unit is initiated by braided fluvial conglomerates which gradually become tidal sand flat association of shale layers, coal seams and sandstone insertion. While the upper part of the unit is consisting of thick bedded quartz sandstone with thin siltstone insertion, deposited in the shoreface environment. Those facies association developed at transgressive conditions in the estuarine environment. The characteristic of the sandstone unit of Pedaro Formation is thickly bedded quartz wacke to quartz arenite, white to light grey in color, moderately to very well sorted, mostly mature sand. Pedaro Formation is identified to be deposited at Early Jurassic in interior craton tectonic setting. The characterization of sandstone unit of Pedaro Formation is showing that the unit can be correlate to the equivalent of Plover Sandstone found in Timor. Sandstone unit of Pedaro Formation can play a role as reservoir candidate in petroleum system of Savu and surrounding area.
Study of
Elodea canadensis
elimination of Sodium Dodecyl Sulphate and NH4Cl
Authors: Sergienko S E , Timofeeva S S , Kupchinsky A B , Chaneva G , Stom D I , Kashina N F
Published: November 2021

The absorption of an anionic surfactant - sodium dodecyl sulfate (SDS) by a Elodea canadensis was studied. Macrophyte (20 g/L wet weight) reduced the concentration of this surfactant from 2 mg/L by 90% within 2 days. A negative effect of SDS on the elimination of ammonium nitrogen by E. canadensis was shown with its content from 1·10-4 M. Thus, in the presence of 1·10-4 M SDS, E. canadensis reduced the concentration of ammonium nitrogen by 51% of the initial value in 2 days (in the control - without surfactants - 92% of the pollutant was absorbed).
Hybridity of economic and social activities on informal market in Jakarta
Authors: Hantono D , Prayitno B , Pramitasari D
Published: November 2021

For more people, public open space plays an important role in everyday life. High accessibility causes a variety of activities to take place, both according to planning and those that take place without being planned. One of the activities that occur spontaneously and continue continuously so that it becomes a permanent construction is the formation of an informal market. The market is a meeting place for two actors, namely sellers and buyers, in economic activities in the form of buying and selling. However, unlike modern markets, traditional markets also take place in hybrid social activities. To find the hybridity of these two activities, it is necessary to conduct a research using a qualitative descriptive approach. The results of this study indicate that these two activities take place alternately and simultaneously. This hybridity is also a factor for their survival in the pressure of an environmental situation that was formed without a plan.
Identification of application of biological architecture in the South Nias’s traditional House in Indonesia
Authors: Siahaan F
Published: November 2021

Nias Selatan is located in the west of the island of Sumatra, Indonesia, has a unique traditional house in the form of a stilt house with a sloping roof, and a wooden frame construction where all the building materials are made of biological materials, obtained from the natural surroundings. Buildings are strongly influenced by the environment and its inhabitants, which are in harmony with the principles of biological architecture. This study aims to identify the application of biological architecture in South Nias traditional houses. The research method used is qualitative content analysis, namely research methods with in-depth conceptual integration. The environment (climate, location, vegetation, land and water) and people / inhabitants (basic human needs, culture, beliefs / religions, and livelihoods) are important indicators as well as factors causing the birth of the traditional house of South Nias. These factors will be analyzed to determine the impact (architectural design, materials, construction) on the building. From the research results, it can be concluded that the traditional houses of South Nias apply biological architecture that reflects the genius locus of their ancestors.