bluuebunny/crossref_metadata_2025 huggingface dataset:
Paper and carbon ink enabled low-cost, eco-friendly, flexible, multifunctional pressure and humidity sensors
Authors: Duan Zaihua , Jiang Yadong , Huang Qi , Wang Si , Wang Yang , Pan Hong , Zhao Qiuni , Xie Guangzhong , Du Xiaosong , Tai Huiling
Published: April 2021

For a long time, the daily paper and carbon ink have been used for writing and painting. With the development of the electronic technology, they are expected to play new roles in electronic devices. Herein, combining the unique characteristics of the paper (rough surface, hydrophilicity) and carbon ink (conductivity), this work rationally proposed two low-cost, eco-friendly, flexible, multifunctional pressure and humidity sensors. The results show that as-fabricated paper-based (PB) pressure sensor has a good sensitivity of 0.614 kPa−1 in the pressure range of 0–6 kPa. The PB humidity sensor has a large response of ∼2120 (current ratio at 91.5% relative humidity (RH) and 0% RH). The PB pressure sensor is proven to be useful for multiple pressure related contact detections, and the PB humidity sensor can be used for many humidity related non-contact detections. Interestingly, combining the different detecting modes of pressure and humidity sensors, some same detecting functions (e.g. switch, respiratory frequency and speech recognition) are realized from contact to non-contact using PB pressure and humidity sensors, which greatly enhance the wearable comfort. Compared with previous reports, this work demonstrates a much simpler approach without expensive raw materials, toxic reagents and high temperature treatment to achieve outstanding sensing performances of the multifunctional pressure and humidity sensors.
Tuning ensemble-averaged cargo run length via fractional change in mean kinesin number
Authors: Wilson John O , Zaragoza Arturo D , Xu Jing
Published: April 2021

The number of motors carrying cargos in biological cells is not well-defined, instead varying from cargo to cargo about a statistical mean. Predictive understanding of motility in cells therefore requires quantitative insights into mixed ensembles of cargos. Toward this goal, here we employed Monte Carlo simulations to investigate statistical ensembles of cargos carried by a Poisson-distributed number of motors. Focusing on the key microtubule-based motor kinesin-1, our simulations utilized experimentally determined single-kinesin characteristics and alterations in kinesin’s on- and off-rates caused by cellular factors and/or physical load. We found that a fractional increase in mean kinesin number enhances the ensemble-averaged cargo run length and amplifies run-length sensitivity to changes in single-kinesin on-rate and off-rate. These tuning effects can be further enhanced as solution viscosity increases over the range reported for cells. Together, our data indicate that the physiological range of kinesin number sensitively tunes the motility of mixed cargo populations. These effects have rich implications for quantitative and predictive understanding of cellular motility and its regulation.
Migration and shape of cells on different interfaces*
Authors: Wang Xiaochen , Fan Qihui , Ye Fangfu
Published: April 2021

Impacts of microenvironments on cell migration have been reported in various interaction modes. A rapid tumor metastasis occurs along topological interfaces in vivo, such as the interface between the blood vessels and nerves. In this work, we culture MDA-MB231 cells at dish-liquid, dish-hydrogel, and hydrogel-liquid interfaces, respectively, to study how these different interfaces influence cell dynamics and morphology. Our results show that the migration mode of cells changes from an amoeboid motion to a mesenchymal motion but their speed do not change obviously if the interface changes from hydrogel-liquid to dish-liquid. In contrast, the migration mode of cells at a dish-hydrogel interface maintains as a mesenchymal motion, whereas their speed increases significantly.
State-to-state dynamics of reactions H + DH’(ν = 0,j = 0) → HH’(ν’,j’) + D/HD(ν’,j’) + H’ with time-dependent quantum wave packet method*
Authors: Zhao Juan , Yue Da-Guang , Zhang Lu-Lu , Gao Shang , Liu Zhong-Bo , Meng Qing-Tian
Published: April 2021

State-to-state time-dependent quantum dynamics calculations have been carried out to study H + DH’ → HH’ + D/HD + H’ reactions on BKMP2 surface. The total integral cross sections of both reactions are in good agreement with earlier theoretical and experimental results, moreover the rotational state-resolved reaction cross sections of H + DH’ → HH’ + D at collision energy E
C = 0.5 eV are closer to the experimental values than the ones calculated by Chao et al. [J. Chem. Phys.
117 8341 (2002)], which proves the higher precision of the quantum calculation in this work. In addition, the state-to-state dynamics of H + DH’ → HD’ + H reaction channel have been discussed in detail, and the differences of the micro-mechanism of the two reaction channels have been revealed and analyzed clearly.
A simple method for implanting free-floating microdevices into the nervous tissue
Authors: Khalifa Adam , Eisape Adebayo , Coughlin Brian , Cash Sydney
Published: April 2021

Objective. Free-floating implantable neural interfaces are an emerging powerful paradigm for mapping and modulation of brain activity. Minuscule wirelessly-powered devices have the potential to provide minimally-invasive interactions with neurons in chronic research and medical applications. However, these devices face a seemingly simple problem—how can they be placed into nervous tissue rapidly, efficiently and in an essentially arbitrary location? Approach. We introduce a novel injection tool and describe a controlled injection approach that minimizes damage to the tissue. Main results. To validate the needle injectable tool and the presented delivery approach, we evaluate the spatial precision and rotational alignment of the microdevices injected into agarose, brain, and sciatic nerve with the aid of tissue clearing and MRI imaging. In this research, we limited the number of injections into the brain to four per rat as we are using microdevices that are designed for an adult head size on a rat model. We then present immunohistology data to assess the damage caused by the needle. Significance. By virtue of its simplicity, the proposed injection method can be used to inject microdevices of all sizes and shapes and will do so in a fast, minimally-invasive, and cost-effective manner. As a result, the introduced technique can be broadly used to accelerate the validation of these next-generation types of electrodes in animal models.
Tagged-particle motion in quasi-confined colloidal hard-sphere liquids
Authors: Schrack Lukas , Petersen Charlotte F , Caraglio Michele , Jung Gerhard , Franosch Thomas
Published: April 2021

We investigate the tagged-particle motion in a strongly interacting quasi-confined liquid using periodic boundary conditions along the confining direction. Within a mode-coupling theory of the glass transition we calculate the self-nonergodicity parameters and the self-intermediate scattering function and compare them with event-driven molecular dynamics simulations. We observe non-monotonic behavior for the in-plane mean-square displacement and further correlation functions which refer to higher mode indices encoding information about the perpendicular motion. The in-plane velocity-autocorrelation function reveals persistent anti-correlations with a negative algebraic power-law decay t
−2 at all packing fractions.
Measurement Albedo Coefficient For Land Cover (Lc) And Land Use (Lu), Using Remote Sensing Techniques, A Study Case: Fallujah City
Authors: Nasif Al Fahdawi Younis M , Mashee Al Ramahi Fouad K , Hamadi Alfalahi Ahmed S
Published: April 2021

Albedo tests the total surface reflectance, offering plenty of useful details on the environment and a deeper understanding of the balance of environment features. Yet usually different sunlight wavelengths are not reflected equally, resulting in a variable surface color and variations in the absorption of certain wavelengths due to changes in the surfaces physical or chemical characteristics. Surface albedo differences can be measured using radiometers, or by using the general equation to extract the value of the albedo for surfaces if all the variables are available. Every space agency uses this equation according to its measured wavelengths. So, the general equation of the satellite landsat was chosen to extract the values of albedo. Surface whiteness is a modulus, and it represents a portion of the incident sunlight reflected by the surface of any feature, and the surface absorbs radiation that is not reflected. The study examined the effect of albedo on the climate of Fallujah and the thermal composition of that urban area. The study used a method that combines remote sensing and geographic information systems to achieve this. Basic samples representing the ten landmarks of Fallujah were taken, the coordinates of these points were measured, and simulated with the satellite images of Landsat 7 and 8 and the sensor (ETM +, OLI) to find the wavelengths of reflectance of these features. When applying the general equation, the albedo values were shown as follows (Buildings with a value of 0.19, Streets with a value of 0.20, Rivers and canals with a value of 0.16, Sand plains with a value of 0.16, River islands with a value of 0.16, Low density arable land with a value of 0.18, High density arable land with a value of 0.15, Gravel land and its value. 0.23, Industrial areas with a value of 0.20, Abandoned land and saline, a value of 0.21).
Study of Multiple Quantum Wire Hg0.8Cd0.2Te/CdTe Laser
Authors: Jassam M H
Published: April 2021

The optoelectronic properties of Hg0.8Cd0.2Te/CdTe quantum wire laser are investigated, with emphasis on the effect of wire width (W) and barrier width (B) on the optical confinement factor (Г), the optical threshold gain (gth
) and the effect number of well (Nw
) on the confinement factor have been calculated. The laser operation system has been studied in the two cases; the number of well (2 and 3). It found that in our theoretical study, the values affect the work of a multiple laser system operating a number of well 2 was (W= 65nm, B = 40 nm), the value of optical confinement factor equals (Г= 0.055) and the amount of optical threshold gain was (gth
= 38 cm
−1). Further, the suitable values for multi quantum wire system is running a number of well 3 was (W= 42 nm, B = 60 nm), optical confinement factor equal to (Г= 0.048) and the threshold gain (gth
= 42 cm
−1). Theoretically, the principle of operation of a laser device depends on the resonator, the effective medium, and the stimulated emission of light radiation which is represented the important process in the work of device. It is found that the effect of optical confinement factor causes an increase in the reflectivity of laser beam in the cavity therefore decrease in the amount of optical threshold gain, noted that the amount of reflection was installed to study the change of other electronic characteristics of the multiple quantum wire.
The Plasmon Effects of AgNPs on Wave Guide Consisting of Polymers Mixed with Rhodamine Dyes
Authors: Suheil S A , Shnan N S , Mohammed Salman Qussay
Published: April 2021

In this research, the optical properties refractive index, absorption spectrum, and fluorescence spectrum of solutions of different concentrations have been studied in order to prepare thin films to obtain an efficient waveguide. A wave guide consisting of three layers has been prepared in which the middle layer has a relatively higher refractive index than the upper and lower layers. This optical wave guide was prepared by using different solutions of two concentrations of poly vinyl pyrrolidone (PVP) & poly vinyl alcohol (PVA) polymers. Different concentrations of the rhodamine pigments RhB & Rh6G were prepared. It is added to the middle layer of the optical wave guide in order to raise its refractive index first and to obtain a laser profit. The practical results have proven that there are specific concentrations of polymers and dyes that can be used to obtain wave guides that have the ability to transmit and amplify the input signal and operate within certain wavelengths. The PVA + RhB(10-4M) model showed the best laser emission performance and the PVA + Rh6G (10-5M) model showed the best signal transmission performance. Finally, the plasmon effect is clearly appears when we added the AgNPs on our samples it’s effecting on threshold pumping and increase the efficiency of wave guide.
Electron Beam Profile Assessment of Linear Accelerator Using Startrack Quality Assurance Device
Authors: Sabbar Ahmed R , Abdullah Siham S , Alabedi Haydar H , Alazawy Nabaa M , Al-Musawi Mustafa J
Published: April 2021

Electron beam therapy using linear accelerator done for patients with superficial cancerous tumors. Daily quality assurance is preferable to assess a good treatment for the patients. This study focuses on penumbra, flatness, and symmetry determination for four types of an electron beam using StarTrack 2D array for quality assurance. Eelectron beam with energies: 6MeV, 9MeV, 12 MeV, and 15MeV for both in-plane (x-axis) and cross-plane (y-axis) using Elekta synergy linac exposed to StarTrack 2D array readings during 16 weeks for testing the performance and stability of StarTrack. The testing protocol used is IEC.The beam profile estimation of variation, when compared with standard values of penumbra, flatness, and symmetry of electron beam energy at the time of commissioning, reveals that all had a variation but these variations are within the limits. It is concluded that StarTrack 2D array detector is favourable in the QA process. Their implementation is not only easy, but gives information about the beam’s temporal stability and is particularly suitable for beam steering mounting.
Statement of Study X-ray Generated in the Effect of Computerized Tomography Devices on Blood Samples
Authors: Ali Ahmed H , Abdulwahed Asmaa M , Khalid Alani Abd-Alrahman , Muhammed Albasher M , Noor A , Mustafa A
Published: April 2021

Studying the effect of X-ray emitted from the CT scanner devices on blood samples taken from a eleven persons between the ages of 10-20, 20-30, 30-40, and 40-60 years. The measurements were many of parameters of blood such as “WBC” White blood cell, “RBC” red blood cell, and “PLT” platelet count. It was noted that the parameters of blood properties that are exposed to X-rays are affected every time in a simple and within the normal range.
The Effect of Modulation Complexity Score (MCS) on the IMRT Treatment Planning Delivery Accuracy
Authors: Jubbier Omar N , Abdullah Siham S , Alabedi Haydar H , Alazawy Nabaa M , Al-Musawi Mustafa J
Published: April 2021

Intensity modulated radiation therapy (IMRT) is an effective treatment planning technique for various types of tumors such as head and neck (H&N) or pelvis. A complexity algorithm was invented to predict the deliverability and the accuracy for IMRT plans called the Modulation Complexity Score ranging from 0 to 1. The %GP is a metric depends on %DD /DTA to find the variation between the calculated dose from TPS and the measured dose from the phantom during the QA. This study is trying to assess the correlation between the MCS and planning verification outcome. Thirty-four patients treated with step and shoot IMRT technique for anatomical sites: H&N and pelvis. The planning process performed using Monaco 5.1 TPS then exported to Elekta Synergy linear accelerator. The phantom is used for the QA procedure is Octavius 4D-1500 with Verisoft 7.1 software analysis to evaluate the gamma passing rate for commonly used criteria 3%/3 mm at a 5% threshold. The MCS calculated using MATLAB 2019a. It results that the H&N plans are significantly more complex than the pelvis once with p-value 0.0192. The analysis shows a weak correlation between the MCS and MU for both treated sites. The complex H&N plans give a good value for %GP. Also, simpler pelvis plans obtain better global %GP results. Thus, modulation Complexity score can give a simple indication for pretreatment verifications of the IMRT plans for H&N and pelvis sites.
Effect of Thermal Annealing on the Electrical Properties and Gas Sensing for Pulsed Laser Deposition Cr2O3Thin Films
Authors: Kaleel Souad G , Suhail Mahdi H , Kamil Hawraa
Published: April 2021

In this study, a double frequency Nd: YAG deposited by Pulsed Laser Deposition (laser beam 1064 nm, 6 Hz repetition rate and 10 ns pulse duration) were used for a thin Cr2O3deposit on glass substrate. Many growth parameters have been considered to specify the optimum condition, namely substrate temperature at room temperature, oxygen pressure (2.8×10-4 mbar), laser energy (600) mJ and the number of laser shots was 500 pulses. The thickness was of about 160 nm and annealing temperature at (300, 400 and 500) °C. Using DC method, the conductivity and Hall coefficient of Cr2O3films were measured. The sensing properties of the p-type (Hall coefficient was positive) films for NO2gas have been studied, and the result revealed that the Cr2O3films have low sensitivity at room temperature, and it’s improved by increasing the annealing temperature to 500° C.
Optical and Morphology Properties of the Magnetite ( Fe3O4) Nanoparticles Prepared by Green Method
Authors: Abdallah Rusul M , Al-Haddad Raad M S
Published: April 2021

Magnetite nanoparticles have been synthesized by a green method. For this process, ferricchloride hexahydrate, ferrouschloride tetrahydrate (2/1 molar ratio) solution was mixed with different amounts of carob leaves extract and NaOH solution was added to get pH(2, 5,8 and 11) heated for 30 min at (30,60,80 and 100) °C . In this report, a description was introduced for the synthesis of Fe304nanoparticles (NPs) in order to obtain the optimum (pH8 ,temperature and amount of extract) that have small particle size MNPs. The magnetite nanoparticles were characterized by UV-Vis absorption spectroscopy, through Field emission scanning electron microscopy (FESEM) and Atomic Force Microscope (AFM). In UV-Vis spectroscopy, the absorbance of surface plasmon resonance (SPR) of magnetite nanoparticles synthesized with different parameters, were observed a single visible peak located in the range of (290-519) nm and it was related to spherical monodisperse, peak shifts to shorter wavelength (blue shift) with change parameter. FESEM images confirm the Fe304NPs synthesized with different parameters were spherical shaped and lower than 50 nanoscale. AFM images of magnetite nanoparticles with different parameter. It is observed that each nucleus magnetite Nanoparticles is spherical in geometry
Measurements of Electron Beam Dose Distributions in Perspex Block for Different Field Size
Authors: Sami Safa , Hameed Ban S , Alazawy Nabaa M , Al-Musawi Mustafa J
Published: April 2021

The linear accelerator is used in radiotherapy to treat tumors whether it was benign or malignant. The megavoltage electron beam is used to treat superficial tumors that do not exceed 5cm depth. In this work the dose distribution before irradiating the patient to check whether the prescribed dose is matched with the irradiated dose to help the physicist to fix the errors or deviations if it is detected. The quality assurance (QA) measured of electron beam with energy 12 MeV at common different depths and field sizes using StarTrack 2D detector and to ensure that it does not exceed the recommended limits. The equipped QA device is a StarTrack 2D detector under the linear accelerator infinity from Elekta at 100 cm from source-to surface distance SSD. The tested energy 12 MeV at depths 0.5 cm and 1.5 cm for field sizes 6cm×6cm, 10cm×10 cm and 14cm×14cm as limits measured according to the International Electrotechnical Commissioning (IEC) protocols. Results show that the revealed an error in the output dose at 6cm×6cm and 10cm×10 cm field sizes for 1.5 cm depth but for 14cm×14cm field size at 0.5 cm depth, the dose found to be above the tolerance. Also it’s found that the output dose is highly reached to 1.5 cm depth than the 0.5 cm. Furthermore, all the rotation axis of the collimator are within the limits with a few noises in the signal at the inline and the crossline axis. We conclude that there was an error in the output does need to be recalibrated before irradiating the patients to electron beam therapy at 12 MeV to assure that the treatment is qualified and efficient.
Improving the Phenomenological Version of Alpha Decay Energy of Heavy and Super Heavy Nuclei
Authors: Mohammed Ali Al-jomaily Firas
Published: April 2021

The nuclear binding energy calculated by the quark model has been used in the current research to quantify alpha decay energy (Qα- value). The research dealt with the odd-even and even - even type of heavy and super-heavy nuclei within the range (78≤ Z ≤ 118). By knowing the number of Z and N for a given nucleus, regardless of its mass, it became possible to calculate the energy of alpha decay. By correlating the experimental nuclear binding energy values of the parent nucleus and its daughters with the theoretically computed values, the quark model was adapted. Graphically extracted calibration equations have been used to produce a modern version of the alpha decay energy by linear and logarithmic matching. As essential statistical instruments, the square root rate and standard deviation were determined to show the utility of adjusted models in testing decay energy and nuclear binding energy. The analyses revealed that the experimental results have been approved.
Impact of Sintering Temperature on Crystallite size and Optical Properties of SnO2Nanoparticles
Authors: Gatea Hamed A
Published: April 2021

Tin oxide (SnO2) nanoparticles synthesized by hydrothermal method and kept at sintering temperatures (800-1200 ºC). The tin (II) chloride dehydrate (SnCl2.2H2O) used to prepared the SnO2precursor solution. The Tin oxide nanoparticles have been characterized by X-ray diffraction (XRD), Field emission scanning electronic spectroscopy (FESEM), and UV-Visible spectroscopy. The nanoparticles size of SnO2depends on the degree of sintering temperature, it found crystallite size (22.12,27.34 , 36.11 and 42.02) nm of the SnO2at800, 900, 1000 and 1200°C, respectively. XRD shows a pure tetragonal rutile crystalline structure for SnO2nanoparticles. FESEM images revealed the particles size increased with increasing sintering temperature. The transmittance and absorption are affected by an increased degree of sintering temperature. The band gap of SnO2nanoparticles decreased with increasing sintering temperature (2.6 to 2.4) eV when temperature raised from 800 to 1200 ºC, which belongs to the effect of particle size
FPGA based area-power-performance analysis of LMS filter using conventional and proposed multipliers
Authors: Pathan A , Memon T D , Sohu F Khan
Published: April 2021

This paper compares LMS filter-based adaptive channel equalizer, implemented on Vertex 7 FPGA using several existing and proposed multipliers. The three main performance parameters taken into consideration are the consumed resources (in terms of lookup tables), utilized power (among various design components), and the performance achieved (in terms of observed frequency). The results show the area-power-performance tradeoff amongst the conventional and proposed multipliers based designs. It is to mention that the proposed multipliers result in more compact systems due to less utilization of resources in all means.
A Review of Cyber Security Assessment (CSA) for Industrial Control Systems (ICS) and Their Impact on The Availability of the ICS Operation
Authors: Bonandir Nor Afiq , Jamil Norziana , Nawawi Md Nabil Ahmad , Jidin Razali , Rusli Mohd Ezanee , Yan Lam Kwok , Maudau Loviana Lenyu Anak Dunstan
Published: April 2021

The equipment in industries in this digital age is controlled by systems connected via internet either wired or wireless connectivity. This technology is demanded in almost all organizations to perform their daily industrial operations. Hence, the system must run without any failure and the rate of system availability is a priority. Most importantly, the entire system must be secured from cyber security threats, vulnerability, and risks so as to ensure that the system is not exposed to the possibility of any cyber attack. Thus, initial security assessment must be conducted to ensure the security aspect of the system. Nevertheless, the evaluation shall not impact the system’s regular operations. As such, the study reviews and discusses the Cyber Security Assessment (CSA) for Industrial Control Systems (ICS) and their possible effect on the availability of ICS operations.
A Systematic review of Multi-Mode Fiber based on Dimensional Code in Optical-CDMA
Authors: Ghazi Alaan , Aljunid S.A. , Idrus Syed Zulkarnain Syed , Rashidi C.B.M , Al-dawoodi Aras , Mahmood Baban A. , Fareed Alaa , Zaenal Mohammed U. , Qasim Nameer Hashim , Rafeeq Ranjdr M.
Published: April 2021

This paper deals with optical code division multiple access (optical-CDMA) and provides a general analysis of multi-mode fiber (MMF). The purpose of this work is to classify the works in the literature that are related to Optical-CDMA based on MMF and to find the limitation of the researches done in this field. Several challenges that occur in the medium such as multiple-access interference (MAI), pulse dispersion (PD) and nonlinearity in optical fibers deteriorate system performances and become a major performance-limiting factor.
Ecology of kazakhstan: problems and ways of their solutions
Authors: Zh Sapanov S , Zhumabayeva K ZH , Makasheva K N , Kairgaliyeva G , Nigmetov B S
Published: April 2021

This article discusses the environmental problems in Kazakhstan, including the problem of the Aral Sea and the reasons which led to such consequences. Also the solutions were proposed, which require close cooperation between the countries. The issue of the international specialized exhibition EXPO 2017 to be held in Astana, devoted to energy future is raised. The article describes the history of such international exhibitions held in Kazakhstan. The main points of the Strategy “Kazakhstan – 2050” the program of N.A. Nazarbayev, the President of the Republic of Kazakhstan, relating to the topic of this article. The importance of environmental education in the modern world was marked.
Antioxidants and Characterization of Stability and Organoleptic Properties of Cocoa Facial Mask
Authors: Gani Siti Salwa Abd , Abd Halim Alyaa Nurathirah , Zaidan Uswatun Hasanah , Effendi Halmi Mohd Izuan , Abdul Wahab Norliza
Published: April 2021

Beauty products plant based are getting increasing interest from users and the cosmetic industry. Cocoa liquor is a natural source of antioxidants from (Theobrama cacao L.) cocoa beans, with potential health benefits. The present study was conducted to determine the stability of cocoa facial mask in different temperature, the durability of CFM in extreme high and low temperature and the prospect of integrating CFM offers additional skin defence capability by eliminating free radicals from the environment. CFM shown stabled with different storage conditions. The amount of ferric ion reducing power (FRAP) in CFM was evaluated by the reduction of ferric-TPTZ to blue ferrous-TPTZ color, while β-carotene linoleate bleaching (β-CB) assay were determined by using β-carotene emulsion. FRAP and β- carotene recorded values of 252.31 ± 0.001 mmol Fe2+/g and 83.42 ± 0.03%, respectively. The EC50 of β-carotene linoleate bleaching (β-CB) reported at 2.92 ± 0.03 mg/mL. The results suggest that CFM is a potential source of phytochemicals. The study presents scientific validation on its phytochemical contents showing presence of bioactive compounds with nutritional and therapeutic values which may have positive impact on skin health and suggesting its prospective use in value-added products such as skin care cosmetics.
Research on Citizen Participation of Public Information Service Platform Amidst the COVID-19 Outbreak in China
Authors: Tong Q W , Abas H B , Yang X D , Yusoff R C M
Published: April 2021

Facing the global epidemic prevention and control situation, public information services are an important part of ensuring the smooth operation of the government and the normal life of citizens. Among them, Internet companies assume a significant part in assisting with uncovering epidemiological information, such as the “same journey query” platform that can query the public transportation itinerary of patients with pneumonia suspected diagnosis. Citizens can understand their health status and make independent declarations to avoid the spread of immunity. To better understand the requirements, willingness, and elements impacting citizen participation, this study constructs a citizen participation model based on the public service system, combined with the Chinese government’s public information interactive management process. Through empirical analysis of the survey data, it is discovered that expectations and perceived quality are the key factors that can significantly affect public participation. It can be concluded that improving the quality of the platform and public expectations will help increase public satisfaction and trust, and ultimately increase public participation. The result is conducive to the better participation of enterprises, governments, and citizens in public information services, and gives insight to future related research.
Calculation of the efficiency of electrically small MF antenna for mine communications
Authors: Kolesnikov A V , Fedosov D V , Nikolaev A V
Published: April 2021

Today, the developers of electrically small antenna equipment are faced with the problem of reliable modeling of electrically small antennas. The existing methods of computer modeling of electrically small antennas, as experience has shown, are resource-intensive. One of the ways to solve this problem is to use the method of replacing the antenna with an equivalent electrical circuit. This method is based on the assumption that any part of the antenna can be replaced by equivalent values of inductance, capacitance or active resistance, which can be investigated together with the elements of the tuning and matching circuit. The resulting equivalent electrical circuit can be analyzed by the methods of the theory of electrical circuits, and most of the antenna characteristics of interest to the developer can be determined. These include efficiency, quality factor, frequency dependences of impedance and voltage standing wave ratio (VSWR). In this work, a sample of an electrically small resonant medium frequency (MF) antenna and its equivalent circuit are presented, and its characteristics are analyzed using the theory of electrical circuits. The graphs of the dependence of the efficiency on the frequency at the resonant tuning of the antenna are plotted.
Parametric optimization of the cables with the modal filtration effect
Authors: Belousov A O , Vlasova N O
Published: April 2021

The work presents the results of simulation and optimization of multiconductor modal filters with a circular cross section. Four 2–5 conductor structures with a circular cross-section were considered. Optimization was performed according to the amplitude and time criteria. As a result, a complete decomposition of the exciting interference signal was achieved in all structures with a maximum attenuation of 4.18 times.
Closed-loop power supply for an autonomous object with a DC power transmission line and voltage drop compensation
Authors: Chekh V , Rulevskiy V , Pravikova A , Lyapunov D
Published: April 2021

The paper considers a closed-loop power supply for an autonomous object that is operated remotely. The power to the object is delivered via a direct current (DC) power transmission line representing a three-wire cable. The length of the cable is considered to be 8 km. The model in MATLAB Simulink has been created to investigate the essentials of the power supply operation and adjust the voltage controller. To compensate the voltage drop across the cable (over 500 V) the current signal correction was introduced. This correction proved to be a reliable method to provide a stable load voltage of 1200 V±2% in steady-state operating modes of electric equipment within the autonomous object structure. This will significantly enhance the overall performance of the equipment that is placed on the considerable distance from the power supply.
Development of a behavioural model of the MEMS accelerometer
Authors: Lysenko I E , Sevostyanov D Y , Ezhova O A
Published: April 2021

This article presents a method for deriving the transfer function for the developed design of a micromechanical accelerometer. A behavioural model of the MEMS accelerometer has been developed taking into account its dynamic and static properties. The obtained simulation results confirm the reliability of the constructed model. For example, under the influence of 5g acceleration, the movement of the sensitive element is 0.9 µm. Reducing the natural frequency increases the stroke of the sensitive element by 0.5 µm.
Improving the criteria for quality assessment of image processing algorithms
Authors: Dubinin D V , Kochegurov A I , Geringer V E
Published: April 2021

Quality criteria are the essence of a measurement system. The goal of assessing the quality of software elements (algorithms) used for image processing is to ensure control of technical performance indicators of the system as a whole or its individual functional units under the reduction of costs associated with minimizing the loss function (tuning and debugging). The correct choice of individual metrics for the generalized quality indicator to solve tasks in a particular subject area is one of the key steps in system optimization. It ensures the most flexible approach to testing the developed software elements, identifying and eliminating their functional shortcomings. At the same time, we can say that in this way the generalized indicator of the entire system (its goal function) is optimized.
Application of the Schottky diode as a detector of continuous terahertz radiation
Authors: Badin A V , Moskalenko V D , Pidotova D A
Published: April 2021

The results of research of the electrophysical and frequency characteristics of the semiconductor structure of a Schottky diode based on gallium arsenide are presented. The diode structure was modelled in the Sentaurus TCAD software package. A comparison of the current-voltage characteristics obtained by mathematical modeling and by experiment are presented. The frequency response in the range of 115-257 GHz is shown. The use of a Schottky diode as a continuous terahertz radiation detector is shown.
Quasi-static analysis of a two-conductor modal filter with a thin passive conductor
Authors: Zhechev Y S , Zabolotsky A M , Gazizov T R
Published: April 2021

The paper presents the results of the quasi-static analysis of a two-conductor modal filter with a thin passive conductor. The geometrical parameters of the structure under investigation were optimized using a genetic algorithm. The authors performed the quasi-static simulation in the time domain with and without losses. It revealed that with a significant reduction in the thickness of the passive conductor it is possible to preserve or improve the electromechanical properties of the modal filter. The authors showed that in the proposed configuration the difference of per-unit-length delays increased from 0.43 to 0.93 ns, and the maximum output voltage decreased from 501 to 498 mV.
Protective holster for firearms
Authors: Kotilevets I D , Ivanova I A
Published: April 2021

At the moment, the information development of modern society is increasingly associated with the expansion of the influence of the Internet of Things, however, there are quite specific areas that require special attention. One of these areas is firearms. In this area, there is a problem of monitoring and controlling the circulation and use of weapons. This article discusses examples of Informatization of firearms. The article also suggests the development of a software and hardware complex in the form of a prototype holster for firearms.
Designing a low-mass, high-current modal filter for the spacecraft power bus
Authors: Kosteletskii V P , Zabolotsky A M , Gazizov T R
Published: April 2021

The paper presents the results of a quasi-static simulation of a modal filter with a reduced cross-section of conductors that are conducting a significant current. Time characteristics in differential and common modes are considered. The dependence of the attenuation coefficient on the thickness of the conductors is shown.
Studying the structures of modal filter with circular reflection symmetry
Authors: Chernikova E B
Published: April 2021

The paper considers the protection of radio-electronic equipment (REE) against ultrashort pulses (USPs) by using the symmetry to decompose a USP into a doubled number of pulses with half as small amplitude. For the first time, we performed a quasistatic simulation of the time response of a 4-conductor and 8-conductor MFs with circular reflection symmetry. It is shown that these MFs are able to decompose the USP into a sequence of pulses of smaller amplitude. However, in order to obtain the required attenuation level, additional optimization by several criteria is required.
Continuous terahertz wave imaging of microelectronics objects
Authors: Berdyugin A I , Badin A V
Published: April 2021

The results of using a terahertz imaging system for microelectronic flaw detection are presented. The distribution of the transmitted radiation through the plastic leaded chip carrier microchip at frequencies of 206 and 806 GHz is obtained. The possibility of using quasi-optical systems with a continuous terahertz radiation source for microelectronic flaw detection has been evaluated.
Time-dependent non-Hermitian systems: pseudo-squeezed coherent states
Authors: Elaihar Lamine , Koussa Walid , Bouguerra Yacine , Maamache Mustapha
Published: April 2021

We introduce a pseudo-squeezed bosonic ladder operator defined as a time-dependent non-Hermitian linear invariant and related to their adjoint operators via the bounded Hermitian invertible operator or metric operator. In fact, they are obtained from the squeezed transformation of the pseudo-bosons annihilation and creation operators. Thus, the pseudo-bosonic squeezed coherent states are just obtained as pseudo-displacement operator method acting on the ground pseudo-squeezed state. To our knowledge, the time-dependent pseudo-squeezed coherent states have not been constructed until now. As an illustration, we study the time-dependent non-Hermitian displaced harmonic oscillator, and the properties of these states are analysed with respect to the localization in position and to uncertainty principle.
On universality of homogeneous Euler equation
Authors: Konopelchenko B G , Ortenzi G
Published: April 2021

Master character of the multidimensional homogeneous Euler equation is discussed. It is shown that under restrictions to the lower dimensions certain subclasses of its solutions provide us with the solutions of various hydrodynamic type equations. Integrable one dimensional systems in terms of Riemann invariants and its extensions, multidimensional equations describing isoenthalpic and polytropic motions and shallow water type equations are among them.
Synthesis and Characterization of K2SiF6 Hexafluorosilicate
Authors: Singh Vartika S. , Moharil S.V.
Published: April 2021

Hexafluorosilicates such as K2SiF6 (Hieratite) exists in nature as minerals. The common formula is M2SiF6 where M represents alkali ion. All the alkali fluorosilicates including K2SiF6 decomposes in the temperature range of 300 to 700 °C with SiF4 as residual product. SiF4 has an important application in the solar cells fabrication industry. Due to low thermal stability, it is difficult to prepare these complex fluorides by the conventional methods. Hence, a one step simple wet-chemical route was adopted. Confirmation of successful precipitation of K2SiF6 during our process of synthesis was done by using various analysis techniques. Results obtained through XRD, EDAX and SEM measurements are reported and discussed here in brief.
A review on exergy analysis of ejector refrigeration system
Authors: Verma Sameer Kumar , Kumar Satyajeet , Sachdeva Gulshan
Published: April 2021

Owing to the human comfort, the utilization of refrigeration system has increased nowadays. In today’s scenario, the air conditioning system has led to the innovative changes in the lifestyle of human beings. The Heat driven ejector refrigeration machine is a favorable alternative to a compression based refrigeration system for the point of view of minimizing energy utilization. As Exergy is directly related to the second law of thermodynamics and the system performance can be only evaluated on the basis of this thermodynamics law. On the basis of efficient performance, it has been concluded that good quality of ejector is more performance oriented rather than other components like condenser, generator and evaporator. This paper presents the idea of ejector refrigeration systems, its exergy analysis and working fluids used. It profoundly investigates the ejector technology and behaviour, exergy analysis, properties of refrigerant and its effect on the ejector refrigeration system.
Performance analysis of ERS using R134a - An experimental investigation (Part 3) – Experimental results
Authors: Kumar Vikas , Tiwari Sandeep , Sachdeva Gulshan , Jain Vaibhav
Published: April 2021

The paper presents the experimental results of the ERS using R134a as a refrigerant. The performance analysis of the single-phase ejector is already analysed in the previous research paper of the series. Additionally, the design and dimension of the ERS is also calculated by the second research paper of the series. In this paper, the experimental results of the fabricated experimental setup are presented for various operating conditions.
Review of Recent Advancements Made In Flexible Energy Storage Devices
Authors: Kumar H , Kumar K , Bhardwaj H K
Published: April 2021

There are unlimited potentials have been seen in the fields of condition health monitoring, wearable consumer electronics and human motion tracking for the design of soft exosuits. Energy storage devices are the key element in all above mentioned fields, which can be of high capacitance, light weighted and flexible too. Fiber based supercapacitors are based fit to these. In last few decades’ different kind of fiber based supercapacitors have been developed, among them carbon nano-tube (CNT) based fiber electrodes showed that their capacitance, energy density and cycle life is higher as compared to conventional wire based electrodes. In this paper our aim is to review the advances made in the field of different type of fiber basedsupercapacitors.
Integral Sliding Mode Controller Design for the Global Chaos Synchronization of a New Finance Chaotic System with Three Balance Points and Multi-Stability
Authors: Vaidyanathan S , Hutapea H M , Feng B , Sambas A , Mamat M. , Subiyanto  , Renaldi F
Published: April 2021

This paper conveys new results of a new finance chaotic system with three unstable balance points of which one balance point is a hyperbolic saddle while the other balance points are saddle-foci. The new finance chaotic system involves three nonlinearities of which one is quadratic, the other is quartic and the third is absolute function nonlinearity. As an application of the new finance chaotic system, integral sliding mode control is invoked to achieve synchronization of master-slave finance chaotic systems. MATLAB simulations are carried out to explain the main results of this research report.
Survival Analysis Competing Risk using Fine-Gray Subdistribution Model with the Maximum Partial Likelihood Estimation Method
Authors: Ainurrochmah A , Purnami S W , Purhadi
Published: April 2021

Survival analysis is a statistical method which the variable of concern is the time until the event occurs. In survival analysis, there is a situation where an individual can experience more than one type of event and the occurrence of these events prevents the occurrence of other types of events. This situation is called competing risk. The situation causes the Kaplan Meier method, which is a method of estimating the survival function, cannot be used. The Cumulative Incidence Function method is proposed as a solution to solve competing risk events uses the probability of each type of event. The Cox regression model is also modified to allow for competing risk is called the Fine-Gray subdistribution model using the Maximum Partial Likelihood Estimation. This study examines the estimation of parameter Fine-Gray subdistribution model and applies it to melanoma case. Melanoma is a type skin cancer that can spread to other organs in the body. In the case of death, melanoma patients who experience death with other causes are called a competing risks and death with melanoma are considered as the event of interest. Study showed that factors that influence melanoma mortality are age, sex, tumor thickness, and cultured epidermal autografts. Patients death with melanoma was 1.400 times higher risk than death with other causes.
Comparison Analysis of the SAW Method and TOPSIS Method in the Decision Support System for Determining Permanent Teachers in SMK Pasundan 2 Banjaran
Authors: Jayanti S D , Budiman  , Yoga T P
Published: April 2021

The decision-making process is quite burdensome because it is necessary to issue the right decisions so many people do it carefully. Nowadays with the development of decision making system can help in the decision making process because it is done with measurable stages and with methods that have a high level of accuracy. By using the Decision Making System, the process of assigning teachers remains in SMK Pasundan 2 Banjaran can be done quickly, precisely and accurately so that it is expected that the results obtained can be accounted for. But here will be tried to do the decision-making process by using SAW method and TOPSIS method by doing comparison or comparison with the two methods with the aim of getting the right results who can be submitted as a permanent teacher of SMK Pasundan 2 Banjaran but also get advantages and disadvantages and which method is appropriately used for the determination of permanent teachers in SMK Pasundan 2 Banjaran from each method by conducting process trials. Each method certainly has stages in the process of determining results to assist in decision making and this can be a reference in looking at the accountable calculation process. Based on the results of comparison or comparison of SAW method and TOPSIS method which then carried out sensitivity test resulted in a method that is similar to this case study namely SAW method. With saw change value of 10.03168% and TOPSIS by 0.62590%.