bluuebunny/crossref_metadata_2025 huggingface dataset:
Tales from the South
Authors: Biar Liana de Andrade , Orton Naomi , Bastos Liliana Cabral
Published: December 2020

This article presents some of the theoretical-epistemological assumptions and methods which underpin Narrative Analysis in Brazil. In the niche we have carved out for ourselves, we combine (auto)ethnographic techniques with analytical tools which draw on both narrative analysis and sociolinguistics, as well as discourse analysis more widely speaking. In this paper, we especially seek to address what we consider the symbiotic relationship between the aforementioned field of study and contemporary transdisciplinary social research. This is done by showcasing examples of narrative research carried out in Brazil, particularly those motivated by sociopolitical concerns. Moreover, we aim to contribute to the debate ignited in post-truth times by the performative view we take of language, and so to speak narrative, by contemplating the practical repercussions of innovations stemming from the current state of affairs within the context of our own investigations.
Compressed sensing of large-scale local field potentials using adaptive sparsity analysis and non-convex optimization
Authors: Sun Biao , Zhang Han , Zhang Yunyan , Wu Zexu , Bao Botao , Hu Yong , Li Ting
Published: December 2020

Objective. Energy consumption is a critical issue in resource-constrained wireless neural recording applications with limited data bandwidth. Compressed sensing (CS) has emerged as a powerful framework in addressing this issue owing to its highly efficient data compression procedure. In this paper, a CS-based approach termed simultaneous analysis non-convex optimization (SANCO) is proposed for large-scale, multi-channel local field potentials (LFPs) recording. Approach. The SANCO method consists of three parts: (1) the analysis model is adopted to reinforce sparsity of the multi-channel LFPs, therefore overcoming the drawbacks of conventional synthesis models. (2) An optimal continuous order difference matrix is constructed as the analysis operator, enhancing the recovery performance while saving both computational resources and data storage space. (3) A non-convex optimizer that can by efficiently solved with alternating direction method of multipliers is developed for multi-channel LFPs reconstruction. Main results. Experimental results on real datasets reveal that the proposed approach outperforms state-of-the-art CS methods in terms of both recovery quality and computational efficiency. Significance. Energy efficiency of the SANCO make it an ideal candidate for resource-constrained, large scale wireless neural recording. Particularly, the proposed method ensures that the key features of LFPs had little degradation even when data are compressed by 16x, making it very suitable for long term wireless neural recording applications.
On obtaining information about the structure and quality of investigated objects revealed from streams of data through the method for identifying structures
Authors: Antonyuk N A , Kataev S G , Kataeva S S , Kelderman H , Klein Wolterink M , Miller A A
Published: December 2020

This work is devoted to the study of the possibility of using the Method of Identifying Structures in solving important practical problems. The first task is to recognize the type of raw material on the moving conveyor belt based on the reflected radar signal. The second is to determine the structure of the subsurface layer based on data obtained by gamma-ray logging and borehole measurements. The conducted research shows the effectiveness of the proposed method and possibility to obtain more information about the quality and state of the object by not only looking at a single measurement, but instead looking at consecutive measurements as on a data stream.
Extending phpMorhy with dialect words
Authors: Gromov Maxim L , Zemicheva Svetlana S
Published: December 2020

This paper describes the work done to create a tool for adding new (dialect) words into the dictionary of phpMorphy. PhpMorphy is a tool written in PHP which helps to annotate a word with grammatical information. It was chosen because it needs not to be trained and it can be integrated into PHP based text corpora search system relatively simply. The search is planned to be done over inverse index of words. The search requests are supposed to contain desired grammatical description of words (eg, “find all feminine adjectives”, etc.). For that reason inverse index should contain grammatical information. The process of adding new words into phpMorphy dictionary technically is not hard however it is time consuming and tedious. To facilitate this work the mentioned tool was developed. Also paper describes the process how the words to add into the phpMorphy dictionary were selected. The words from the given dialect dictionary were run through phpMorphy. If phpMorphy correctly recognizes a word, then it should not be added into the phpMorphy dictionary. Otherwise it should be.
Experience of ontological modeling as bases for use in BIM
Authors: Gushchin A N , Divakova M N
Published: December 2020

The traditional technology for designing building documentation uses a staged approach: first, an architect expresses a conceptual idea, which is then specifies by a planners and a constructor embodied in the building documentation. The transition to BIM technologies creates a fundamentally new environment for design. The article discusses how an architect have to adapt to new working conditions in order to maintain his leading role as a conceptual developer. It is demonstrated that the solution to the problem can be the use of the ontological modelling language by the architect.
Determining temperature and partial pressures of the components of a high-temperature gas mixture using artificial neural networks
Authors: Kashirskii D E
Published: December 2020

The article deals with solving the inverse problem of gaseous media optics by determining the parameters of high-temperature gaseous media from its transmittances using the artificial neural networks. The study of the dependence of the maximum relative error in determining the desired parameters on the size of the training set and the artificial neural network configuration is carried out. The possibility of solving the inverse problem in the case of a four-component gas mixture (water vapor, carbon dioxide, carbon oxide and nitrogen oxide) is shown.
On the use of the project interface method when organizing instrumental observations irregular natural phenomena
Authors: Kudryavtsev N G , Yu Gozdarev A , Kudin D V , Uchaikin E O , Temerbekova A A
Published: December 2020

The work is devoted to the problem of organizing university infrastructure, which allows students to be involved in projects related to instrumental observations of irregular natural phenomena. The purpose of the work is to study factors that simplify the process of organizing and conducting regular measuring experiments, allowing students and teachers of higher Education institutions to study and research rare natural phenomena. At the beginning of the work, an overview of literature is given, which describes the experience of using the project approach as part of the educational process and additional education. The main part of the paper describes an example of creating an educational measuring polygon the GASU. The method of design interfaces is proposed as a technology that allows you to simplify the process of creating a polygon and maintaining it in working order. The final part of the work is devoted to a detailed analysis of an example of a scientific study of an irregular natural phenomenon, the data on which were recorded as a result of the measurement experiments. The discussion section of the work concludes that the project approach and the method of project interfaces make the process of introducing instrumental observations into the educational process effective and beneficial for students.
3D-simulation of emergency evacuation
Authors: Tugarinov M A , Shulga I D , Yurchenko E A , Ermakov A D
Published: December 2020

The article presents the results of the development of the 3D modelling system for the evacuation process of people in case of fire and test experiments. The article describes the choice of the programming environment and the behaviour of the characters. The results of the test simulations of character behaviour, including processes of assisting other characters and fire-extinguishing, are shown. The presented results are the basis for creating a complete simulation model with increased realism.
Use of information technologies in the laboratory practice in the course “measuring instruments and devices in radio engineering”
Authors: Vasilenko R A , Zhabin O S
Published: December 2020

The article discusses an example of the use of e-learning in a laboratory workshop in the discipline “Measuring instruments and radio engineering devices.” The structure of the organization of e-learning is considered. Some work of the workshop are described.
Feasibility of thermal photon measurements in heavy ion collisions at NICA energies
Authors: Ivanishchev D , Kryshen E , Kotov D , Malaev M , Riabov V , Riabov Yu
Published: December 2020

Thermal photons serve as valuable probes of the hot and dense medium produced in heavy ion collisions. The effective thermal photon temperature measured at RHIC and LHC energies far exceeds the temperature predicted for the phase space transition into the deconfined state of quarks and gluons, known as quark-gluon plasma (QGP). Direct photon measurements in heavy ion collisions at the future NICA collider may help to estimate the effective temperature of the produced medium at lower energies and trace the transition from QGP to the hadron gas state. In this contribution, we present feasibility studies on the thermal photon measurements in AuAu collisions using the photon conversion method in the MPD experiment at NICA.
Directed flow of protons with the event plane and scalar product methods in the HADES experiment at SIS18
Authors: Mamaev M , Golosov O , Selyuzhenkov I
Published: December 2020

Differential measurements of the directed flow of protons of Au+Au collisions at the beam energy of 1.23AGeV collected by the HADES experiment at SIS18 are presented. Measurements are performed with respect to the spectator symmetry plane estimated using the Forward Wall hodoscope. Corrections for the detector azimuthal non-uniformity are applied. Event plane and scalar product methods are used to evaluate the systematic uncertainty.
Recent highlights of top-quark physics with the ATLAS detector
Authors: Diez Pardos C
Published: December 2020

Highlights of the most recent top-quark measurements obtained using the full data set collected with the ATLAS experiment at the LHC at a centre-of-mass energy of 13 TeV, corresponding to 139 fb−1 of integrated luminosity, are presented. The results include inclusive and differential cross-section measurements of the production of top-quark pairs in association with a photon or a Z boson, the first evidence of four-top-quark production and a novel measurement of lepton flavour universality in top-quark topologies.
Recent three-flavor neutrino oscillation results from the NOvA experiment
Authors: Kolupaeva L
Published: December 2020

NOvA is a long-baseline experiment studying primarily neutrino oscillations in the NuMI beam from Fermi National Laboratory (FNAL), USA. It consists of two functionally identical, finely granulated detectors which are separated by 810 km and situated 14.6 mrad off the NuMI beam axis from FNAL. By measuring the transition probabilities P(vμ
→ ve
) and P(vμ
→ vμ
), NOvA is able to probe the following parameters:

Δ

m

32

2

, the mixing angle θ
23, the CP violating phase δCP
and the neutrino mass hierarchy. This document is devoted to the latest NOvA measurements of the neutrino oscillation parameters using neutrino and antineutrino disappearance and appearance obtained in 2020.
K effective factor in the ADSR using liquid lead target and (Th233U)O2, (Th235UO)2, (Th238U)O2 fuel mixture
Authors: Tien Tran Minh , Khanh Nguyen Kim , Hien Bui Thi Thanh , Luong Nguyen Thi Thuy , Phung Nguyen Hong Thien , Thi Nguyen Thi Mai
Published: December 2020

The study of using liquid lead target for the accelerator driven subcritical reactor (ADSR) has been proposed by Nguyen Mong Giao, Vu Thi Diem Hang, Tran Minh Tien (International Journal of Modern Physics and Application. Vol. 2, No. 3, 2015). The calculations about neutron distribution, neutron fluxwith thorium fuel and thorium mixturehas been showed by Tran Minh Tien (Distribution of Neutrons from The Reaction (p, n) on the Liquid Lead Target in The Accelerator Driven System Reactor, J. Phys.: Conf. Ser. 1172 012066, 2019; Distributions of neutron flux from (p, n) reaction on the liquid lead target for accelerator driven subcritical reactor (ADSR), J. Phys.: Conf. Ser. 1324 012061, 2019). In this paper, the k effective factor is calculated with(Th233U)O2, (Th235U)O2and(Th238U)O2fuel mixture.
The influence of electromagnetic waves on conductivity tensor with the presence of a laser field in semiconductor
Authors: Ngoc Hoang Van
Published: December 2020

Currently strong laser radiation can affect the conductivity and other dynamic effects in semiconductors, not only changing the carrier concentration or temperature, but also changing the probability of electron scattering. It has also been shown that light radiation can change the magnitude of these effects and also expand their range of existence. Electron scattering in the presence of strong radiation can be complemented by the absorption and radiation of photons. This paper presents the influence of electromagnetic waves on conductivity tensor with the presence of a laser field in semiconductor. The conductivity tensor was calculated in the presence of an electromagnetic wave, a laser field from which to plot the conductor tensor dependence on the electromagnetic wave frequency and the laser field frequency.
ZnO-CuO nanocomposites: synthesis, characterization and antibacterial activity
Authors: Bandekar Sneha S , Hosamane Sateesh N , Patil Chidanand , Yaragatti Akshata , Hukerikar Akshay , Patil Sachin , Chachadi Pavan
Published: December 2020

Nanotechnology deals with the study of manipulation of the materials on molecular or an atomic scale. Nanomaterials and nanocomposites possess unique characteristics such as miniature particle sizes with a close particle size distribution properties and pose as a highly dispersed and non-agglomerative mass. The typical blend and diverse characteristics of these particles prove to be of added advantage in typical applications such as medical and pharmaceutical treatments for bacterial infections. This paper describes the detailed process of synthesizing nanocomposite oxide mixtures of copper and zinc through the sol-gel formulation route technique. The particle size distribution is assessed using Brunauer-Emmett-Teller and Scanning Electron Microscopy analysis. The mineralogical analysis of the nano-composite is carried out using X-Ray Fluorescence and X-Ray Diffraction techniques. The synthesized ZnO-CuO particles possess antibacterial properties against both gram-(positive/negative) bacteria and hence, they exhibited good results on E.coli, Staphylococcus aureus and Pseudomonas aeruginosa.
Effect of IR irradiation on the various properties of chemically prepared zinc sulphide thin films
Authors: Ribin K K , Navya N , Naseema K
Published: December 2020

Zinc sulphide thin films have been deposited on glass substrate using simple low cost chemical bath deposition method at 80°C for 2 hours. One of the samples is post irradiated with infrared radiation for one hour. Structural, optical and morphological studies were done for both samples and the results were compared. XRD pattern of the IR irradiated sample shows enhanced crystallinity. Optical band gap was found to be 3.31eV for pure ZnS and 3.93 eV for the IR irradiated ZnS thin film. The films prepared by using this facile method are suitable for optoelectronic applications.
Optoelectronic analysis of silicon doped ZnGa2S4: A first principle study
Authors: Gaur A , Khan K , Soni A , Dashora A , Sahariya J , Ahuja U
Published: December 2020

This paper depicts a comprehensive investigation of Si doping on the wide bandgap ternary semiconductor ZnGa2S4. The first principles Wien2k code is utilized by adopting the Perdew-Burkhe-Ernzerhof Generalized Gradient Approximation (PBE-GGA) method. Band engineering is done in order to get a suitable value of bandgap in the region of solar spectrum. For this purpose the doping of Si and its effect on ZnGa2S4 is investigated. The bandgap computed by the doping of Si atom has turned out to be 2.14 eV which has decreased in comparison to the bulk compound 2.38 eV. Electronic and optical properties of this doped material are studied. The integrated absorption curve offers a value of 61.205. The imaginary part of the dielectric tensor offers peaks which help in understanding the inter-band transitions. Also the values of reflection and refractive index are calculated exploring the feature of optical properties in the wien2k package.
Correlation analysis between element and aromatic bond count attributes of illicit drugs
Authors: Pon Mary Pushpalatha D , Joseph Pushparaj D , Gayathri R
Published: December 2020

World has large amount of data. Data has to be segregated according to the discipline. Biological data has many number of division. This research work the drug data has been taken as input. In this illicit drug data has been taken from data.world web site. There are many attributes are available, But the element count and aromatic bond count has been taken from the data set and the data has been statistically analyzed.
Dynamics of structural - inhomogeneous coaxial-multi-layered systems "cylinder-shells"
Authors: Mirsaidov M M , Safarov I I , Teshaev M Kh , Boltayev Z I
Published: December 2020

A mathematical model and a technique for assessing the efficiency of the dissipative ability of structurally inhomogeneous mechanical systems consisting of multilayer cylinders bonded to a thin viscoelastic shell of finite length have been developed. A detailed analysis of the known works devoted to this problem is given. A model, methodology, and algorithm for studying the natural and forced oscillations of a system to assess the damping ability of structurally inhomogeneous elastic and viscoelastic mechanical systems, taking into account the influence of the geometric and physico-mechanical parameters of the shell and cylinderhave been developed. In solving the problems considered, the method of divided variables, the method of the theory of potential functions, the Mueller method, the Gauss method and the orthogonal sweep method were used. The complex eigenfrequencies, amplitudes of forced oscillations are determined, and the largest dephasing abilities of the considered structurally inhomogeneous systems are estimated. It has been revealed that, the effect of the greatest damping ability in structurally heterogeneous systems is manifested when the real parts of complex natural frequencies come closer due to the interaction of close natural forms with each other.
Influences of series resistance and epitaxial doping densities on the terahertz performance of gallium nitride avalanche transit time source: A high-power 1.0 THz radiator
Authors: Khan S , Acharyya A , Biswas A , Sarkar B , Inokawa H , Dhar R S
Published: December 2020

Two-dimensional large-signal and noise simulations are used to study the terahertz (THz) performance of Gallium Nitride (GaN) avalanche transit time source (ATT) source. A comprehensive model of parasitic series resistance has been developed by which the effect of series resistance on the large-signal and noise performance of the 1.0 THz GaN ATT source has been investigated; the proposed model is based on time varying depletion width modulation under large-signal oscillating condition. Significant amount of deterioration in power output and efficiency have been observed due to the existence of series resistance of the device. On the other hand, the realization of the optimized structure and doping profile as per the theoretical design is a tricky job by considering the state-of-the-art GaN fabrication technology. Especially, achieving the absolute values of epitaxial doping densities is almost an unrealistic task. Therefore, it is very important to acquire the knowledge about how much extent the power output, series resistance and noise measure of the source are affected due to the change in doping level of both n- and p-layers. In the present study, the sensitivities of the above-mentioned parameters with respect to the change in the doping densities of n- and p-layers have been investigated.
Statistical analysis of SNR and optical power distribution in an indoor VLC System
Authors: Chaurasia Akshit , Sharma Mayank , Akansha  , Garg Abhinav , Rani Rekha
Published: December 2020

VLC(Visible Light Communication) is a new and emanating technique which uses light for communication. For indoor wireless ommunications, it is considered as a promising scheme for both information bearing communication as well as illumination. It provides high data rate performance at reduced cost. The aim of this paper is the analysis of optical power distribution and signal to noise ratio in an indoor VLC system. Analysis of power distribution and SNR is done by changing the direction of LEDs. It is observed that the noise in the optical channel link between the LED and photodetector dominates the data transmitted. Finally, simulation results and various parameters affecting the performance of VLC is also studied
Patch antenna with circular and rectangular notches and slots for millimeter waves
Authors: Singh Ashish , Shetty Ramya , Deepa K , Shet Krishnananda , Prasad Durga
Published: December 2020

This manuscript presents Rectangular patch antenna with slots and notches for mm wave. An antenna has dual band with two resonating bands at 24GHz and 39 GHz. First resonating band gives ultra wide band of 27.08% while second resonating band is narrow band. Antenna characteristics have been observed such as radiation pattern, radiation efficiency, impedance and reflection co-efficient. The radiation efficiency of 80% and broadside radiation pattern d has been observed at center frequency. The variation of dielectric constant on the patch has been also observed in achieving dual band. This antenna can be used in various wireless applications such as 5G allocation band of European countries, vehicular communication.
Review of physical and mathematical modelling aspects of thermal management of induction motors
Authors: Sachin S , Sriram A T
Published: December 2020

This review paper summarizes the importance of thermal management system and mathematical models used in the prediction of temperature distribution of an induction motor. The lumped parameter thermal network modelling approach is explained in detail with a suitable example. The recent computational methods and their pros and cons on estimating the temperature distribution are discussed. The experimental method on estimating equivalent value for thermal resistance and capacitance is highlighted from the literature. The understanding on physical mechanism of heat transfer is emphasized to recognize thermal flow path for better utilization of cooling techniques. The recent trend in coupling electromagnetic and thermal phenomena is also considered. This study will be helpful on future design of induction motor to meet difficult constraints.
Analysis of cracks in structures and buildings
Authors: Velumani P , Mukilan K , Varun G , Divakar S , Muhil Doss R , Ganeshkumar P
Published: December 2020

Analyzing and identifying cracks is the most vital step in the construction process. The manual crack detection process will take longer and will be subjectively assessed by the inspectors. This research provides a conceptual base for the image processing methodology for the automated identification and examination of cracks. This model uses the Gray Intensity Correction Method ( i.e.) Min Max Gray Level Differentiation (M2GLD) for Image Improvement and the Otsu Image Binarization Process. The experimental result shows that the combination of the M2GLD method and the Otsu test will effectively detect crack defects in digital images. This model can therefore be a useful tool for building construction agencies and structural maintenance engineers.
Application of earned value method and earned schedule method for a residential apartment
Authors: Vaibhava S , Prakash Rao B , Shetty Dheeraj Vishwanatha , Prakash Chandra
Published: December 2020

Earned Schedule Management (ESM) gives an estimate of schedule and milestone achievement dates. Earned Value Management (EVM) assists to follow the project performance by giving the schedule variance, cost variance and their performance index. EVM &ESM helps the project manager to foresee cost and schedule for the real project. The objective of this study is to apply EVM & ESM to the real time residential apartment project which is upcoming in Bengaluru, Karnataka, India and then to compare the results of two deterministic forecasting methods EVM and ESM. The EVM and ESM parameters are generated by using the data procured from the planning department. It shows much fluctuation in the project performance but the last months (M10) results reveal that the project is behind schedule, unfavorable budget and needs more amelioration. The project has an unfavorable Cost Variance of -0.91(budget in crores of INR, 1 crore = 10millions)) and schedule variance of -6.71months. It is also observed from the results and actual project situations that Earned Value and Earned Schedule methods in conjunction gives more accurate interpretation than using each of them detachedly.
Multiple regression analysis to predict the value of a residential building and to compare with the conventional method values
Authors: Shetty Dheeraj Vishwanatha , Prakash Rao B , Prakash Chandra , Vaibhava S
Published: December 2020

Valuation is an art which has found various use in different sectors. But it is seldom restricted to the boundaries of engineers and architects when it comes to property valuation. In the present study, the market value of a residential building situated in Udupi, Karnataka State, India is predicted using Multiple Regression Analysis (MRA) based on the factors affecting the value of the property. This value is then compared with the values obtained by the conventional approaches of valuation like Land and Building method, Rental Income Approach, Composite Rate method and by detailed estimation approach. The property under valuation has a plinth area of 2545.42 square feet standing on a free hold land of 4207.896 square feet. The market value predicted by Multiple Regression Analysis (MRA) shows a variation of 14.10% in comparison with Land and Building method, a variation of - 22.17% in comparison with Rental Income approach, a variation of 4.90% in comparison with Composite Rate method and a variation of 8.81% in comparison with detailed estimate method. The advantage of using MRA is that it uses statistical modelling and reduces the chance of human bias and error.
Exploring popular topic models
Authors: Tijare Poonam , Jhansi Rani P
Published: December 2020

Information from micro-blogging site such as Twitter is a huge repository of data. A lot of research is happening on sentiments, discovering patterns and prediction. One challenging task is dividing this humongous unstructured data into clusters. Several topic modeling methods are proposed by researchers. This paper presents a brief summary of topic modeling methods LDA, LSI and NMF and their applications. Experiments are conducted on the Twitter based datasets created using tweets on keywords Cauvery river, Lokpal bill and Rahul Gandhi. Paper covers a brief discussion on evaluating the accuracy of topics formed using perplexity, log-likelihood and topic coherence measures. Best topics formed are then fed to the Logistic regression model. The model created is showing better accuracy with LDA.
An empirical evaluation on the performance of food service industry in Malaysia with TOPSIS model
Authors: Hoe Lam Weng , Siew Lam Weng , Fai Liew Kah , Xin Agnes Lai Jing , Fun Lee Pei
Published: December 2020

The food service industry makes impacts on society and plays a key role in expanding economic and business opportunity. Besides that, the economic sector is also contributed by the food and beverage industry. Therefore, performance evaluation is vital for the food service industry in a highly competitive environment in order to improve the decision-making process in an organization. The objective of this study is to propose a conceptual framework in evaluating and ranking the financial performance of the food companies from the consumer products sector in Malaysia with Technique for Order Preference by Similarity to Ideal Solution (TOPSIS) model. Current ratio, return on equity, profit margin, debt to equity ratio, earnings per share, dividend yield and price earnings ratio are the financial ratios employed in this study. The results of this study show that HEXZA gives the highest performance, followed by TGUAN, 3A and finally CANONE. This study is significant as it helps to evaluate the financial performance of food service industry in Malaysia with the proposed conceptual framework using TOPSIS model.
Alternate material for pressure cooker gasket
Authors: Zalaki Kartik , Patil Sharad , Patil Sujay , Chatta Aakash , Patil Shubham Naik Arun Y , Kotturshettar B B
Published: December 2020

The use of Gasket or sealing ring is one of the most important and just less than a perfect method to prevent leakage of fluids both during the static and dynamic condition. Moreover, the subject of using natural or organic materials has gained prime importance amongst both designers and researchers to reduce environmental impact. This study focuses on the design and Analysis of gasket material which has a combination of Latex and Natural Fibres. Significant areas where gaskets are used have thermal and pressure force as a boundary condition, which demands the need for various sealing ring material. The model of Gaskets is prepared as per standards in SOLIDWORKS 2016 Comparison based on equivalent stress, deformation, thermal expansion, thermal stress and strain are done between Silicon rubber and natural composite materials in ANSYS workbench 18.2. The model was analysed between three materials which are Silicon rubber, Latex and Banana fibres, Latex and Coconut coir. Mathematical interpolation is used to obtain various mechanical properties of the natural Fibre using volume fraction. The critical properties considered for the Analysis are young’s modulus, the thermal expansion coefficient of the Natural Fibres
The effects of thermal overload in chimney caused by insulation damage
Authors: Maj M , Ubysz A
Published: December 2020

Modern approach to Structural Health Monitoring of building structures demands for reliable data concerning current technical condition of analysed structure or its parts. Data are provided preferably by means of non-destructive testing or visual inspections. When the analysed object is non- or hardly accessible (like in the case of tall industrial chimneys), remote techniques based on displacement, vibration or temperature control are appreciated. The current study focuses on the problem of thermal overload induced internal forces caused by insulation damage. Condensation inside the chimney affects the internal thermal insulation and migrates through the chimney wall from the inside. Moistening of the internal thermal insulation causes a progressive loss of its insulating properties. The corrosion of concrete and reinforcing steel is therefore progressive due to the increase in the temperature gradient in the reinforced concrete wall of the chimney, causing a large increase in internal forces, mainly tensile and shear stresses, and the appearance of additional cracks in the wall. The estimation of internal forces related to thermal influences given in the presented example indicates the significant threats that these influences may generate. In conclusion, it was pointed out that the proposed thermographic tests can be very helpful in monitoring temperature changes and signalling growing problems with the durability of chimney walls.
Design cycle implementation on a customized steering knuckle for a competition ATV
Authors: Deshpande Aditya , Ekabote Nagaraj , Sridhar A S , Vernekar Akshay
Published: December 2020

The design cycle in its most basic terms can be defined as investigate, plan, create and evaluate. It has been adopted by every engineering team in its own way to strengthen the intended design. The crucial factor of any mechanical design is consideration of service loads for components proposed function. This paper talks about the implementation of the design cycle on three iterations of a customized steering knuckle for BAJA SAE India competition. Effect of terrain and road profiles on vehicle along with conventional knuckle design process is highlighted. The authors outline the criteria and limitations of knuckle design for a competition and discuss the first design and its performance and failures, failure analysis and how the lessons learnt were incorporated in the second design. The design cycle was revisited for optimization resulting in a third design. Finally, the optimized design steering knuckle was fabricated and tested in actual terrain of the competition for validation.
Global, regional and national trends of atmospheric ammonia derived from a decadal (2008–2018) satellite record
Authors: Van Damme Martin , Clarisse Lieven , Franco Bruno , Sutton Mark A , Erisman Jan Willem , Wichink Kruit Roy , van Zanten Margreet , Whitburn Simon , Hadji-Lazaro Juliette , Hurtmans Daniel , Clerbaux Cathy , Coheur Pierre-François
Published: December 2020

Excess atmospheric ammonia (NH3) leads to deleterious effects on biodiversity, ecosystems, air quality and health, and it is therefore essential to monitor its budget and temporal evolution. Hyperspectral infrared satellite sounders provide daily NH3 observations at global scale for over a decade. Here we use the version 3 of the Infrared Atmospheric Sounding Interferometer (IASI) NH3 dataset to derive global, regional and national trends from 2008 to 2018. We find a worldwide increase of 12.8 ± 1.3 % over this 11-year period, driven by large increases in east Asia (5.80 ± 0.61% increase per year), western and central Africa (2.58 ± 0.23 % yr−1), North America (2.40 ± 0.45 % yr−1) and western and southern Europe (1.90 ± 0.43 % yr−1). These are also seen in the Indo-Gangetic Plain, while the southwestern part of India exhibits decreasing trends. Reported national trends are analyzed in the light of changing anthropogenic and pyrogenic NH3 emissions, meteorological conditions and the impact of sulfur and nitrogen oxides emissions, which alter the atmospheric lifetime of NH3. We end with a short case study dedicated to the Netherlands and the ‘Dutch Nitrogen crisis’ of 2019.
Protecting quantum correlations in presence of generalised amplitude damping channel: the two-qubit case
Authors: Goswami Suchetana , Ghosh Sibasish , Majumdar A S
Published: December 2020

Any kind of quantum resource useful in different information processing tasks is vulnerable to several types of environmental noise. Here we study the behaviour of quantum correlations such as entanglement and steering in two-qubit systems under the application of the generalised amplitude damping channel and propose two protocols towards preserving them under this type of noise. First, we employ the technique of weak measurement and reversal for the purpose of preservation of correlations. We then show how the evolution under the channel action can be seen as an unitary process. We use the technique of weak measurement and most general form of selective positive operator valued measure (POVM) to achieve preservation of correlations for a significantly large range of parameter values.
Weyl–Wigner representation of canonical equilibrium states
Authors: Nicacio F
Published: December 2020

The Weyl–Wigner representations for canonical thermal equilibrium quantum states are obtained for the whole class of quadratic Hamiltonians through a Wick rotation of the Weyl–Wigner symbols of Heisenberg and metaplectic operators. The behavior of classical structures inherently associated to these unitaries is described under the Wick mapping, unveiling that a thermal equilibrium state is fully determined by a complex symplectic matrix, which sets all of its thermodynamical properties. The four categories of Hamiltonian dynamics (parabolic, elliptic, hyperbolic and loxodromic) are analyzed. Semiclassical and high temperature approximations are derived and compared to the classical and/or quadratic behavior.
Convective potential of the atmosphere of Western Siberia amid global climate change
Authors: Gorbatenko V P , Pustovalov K N , Konstantinova D A
Published: December 2020

In the process of warming, the atmosphere of Western Siberia gets warmer and wetter due to local sources of moisture. This is accompanied with amplification of convection processes in the warm seasons and increasing frequency of extreme weather phenomena. Trends in atmospheric instability and their causes on a territory located in the Ob-Irtysh interfluve and limited by 50–64 °N, 60–95 °E, including the Vasyugan Swamp, are analyzed. The swamp boundaries distinctly marked on temperature maps in the last decade indicate changes in the thermal radiation of the swamp surface. These changes in heterogeneity of heating and heat exchange are reflected in changes in atmospheric instability as well. The greatest changes in the atmospheric temperature mode have been observed in the Great Vasyugan Swamp.
Simulation of near-bottom water warming in the Laptev Sea
Authors: Golubeva E , Kraineva M , Platov G
Published: December 2020

A coupled ice-ocean model forced by atmospheric reanalysis data is used to examine a change in the bottom layer of the Laptev Sea on a scale of several decades. The model shows that since the mid-1980s there has been a warming of bottom waters in the shelf region. Analyzing values of bottom temperature averaged over a decade, we show that since 2005 the intensity of warming of the bottom layer has increased. The main reason for this is disappearance of ice cover in summer accompanied by an influx of heat into the surface layer of the sea. Also, an essential factor is the dynamic state of the atmosphere. The intensification of surface currents due to wind action promotes mixing of waters and heat transfer to the bottom layer of the sea. The heat anomalies entering the near-bottom layer of the sea during the autumn cooling could exist during the winter period.
Modeling the temperature and humidity conditions of mineral soils in an active layer model taking into account in depth changes in the thermodynamic properties of the soil
Authors: Bogomolov V Yu , Dyukarev E E A , Stepanenko V M , Drozdov E D
Published: December 2020

The thermal regimes of peat and mineral soils differ significantly. Peat soils are characterized by the presence of a surface peat horizon, which is replaced by organogenic rock. The total thickness of the peat layer can reach several meters. The peat strata is a complex organomineral system with specific properties: high water content and porosity, the content of a large amount of little decomposed organic. For the correct modeling of this type of soil, a transition was made from the approach of modeling heat and moisture transfer in a porous medium with averaged thermodynamic characteristics (porosity, density, hydraulic conductivity …), to modeling heat and moisture transfer for each of the identified soil types with individual properties. In addition, in the modified model, all constants describing the thermodynamic properties of the soil are functions of depth. This made it possible to model soils with a complex soil profile, for example, bog ecosystems (peat deposit and a layer of mineral soil under it). To calculate the thermophysical characteristics of soils, the measured volumetric content of organic matter, mineral particles of different sizes, and soil porosity at all depths were used. Calculations based on the model of the active layer showed that within the framework of the approach used it is possible to correctly reproduce heat and moisture transfer in both mineral and organic soils without adding any runoff-related parameterizations, but using relevant thermophysical characteristics of the soil.
Analysis of turbulent kinetic energy decay power law in atmospheric boundary layer models
Authors: Tkachenko E V , Debolskiy A V , Mortikov E V
Published: December 2020

The transitional periods that take place in the atmospheric boundary layer are challenging to model due to their non-stationary nature. Large-eddy simulation (LES) models have proven to be sufficiently accurate for modeling the evening transitions, and now a possibility to adapt turbulent kinetic energy (TKE) closure models for calculations in single-column models appears to be very plausible. In this study, evening transition modeling is analysed with emphasis on the pattern of a TKE decay which follows the power law.E(t) αt−αThe effects of different parameters on the results of the simulations are explored, along with the geostrophic wind effect on the model. It is shown that the model presented here behaves in a manner similar to that of a LES model, thus showing that the above adaptation is possible and worth being investigated further.
Rossby wave breaking and blocking events associated with some atmospheric circulation regimes in the Northern Hemisphere based on a climate system model (PlaSim-ICMMG-1.0)
Authors: Krupchatnikov V N , Borovko I V
Published: December 2020

Potential vorticity (PV) streamers and cutoffs are indicators of Rossby wave breaking (RWB) near the extratropical tropopause. The Rossby wave breaking forms an elongated high-PV stratospheric air tongue that extends to the equator and a tropospheric low PV air tongue that extends to the pole. There are two types of RWB: equatorward and poleward ones. Frequently, PV tongues stretch into narrow filaments, so-called PV streamers that split into PV cutoff vortices. Here the terms stratospheric PV streamer and cutoff refer to stratospheric features of isentropic surfaces (PV > 2 PVU; where 1 PVU = 10−6 K_kg−1 m2_s−1). In this paper, we study a configuration of the potential vortex field using model data. The main areas of RWB in winter and summer are shown. Atmospheric blocking events represent some of the most high-impact weather patterns in the mid-latitudes, but they have often been the cause of unsuccessful future climate projections. In this paper, we have examined the seasonal frequency of global blocking events in relation to a change in the mean EOF index based on some modeling results obtained by using a climate system model, PlaSim-ICMMG-1.0.
Selection of Scots pine seedling growth stimulants in extreme conditions of the Northern Kazakhstan steppe zone
Authors: Kabanova S A , Musoni W , Zenkova Z N , Danchenko M A , Scott S A , Kabanov A N
Published: December 2020

The aim of this research is to determine optimal methods of using stimulants in a pre-sowing treatment of common pine seeds to increase their germination and obtain high-quality planting material. A study has been performed in forest nurseries of the State Forest Natural Reserve (SFNR) “Ertis Ormany” (Pavlodar region) and the Arykbalyk Branch of the State National Natural Park (SNNP) “Kokshetau” (Akmola region). The research is done with one-and two-year-old seedlings of ordinary pine sowing of 2017. A presowing seed preparation is carried out according to six options by using various types of stimulants. A method of mathematical processing of the thus obtained measurements of the seedlings with an insufficient number of measured plants is proposed by using a bootstrap analysis with and without quantile information. It allows one to estimate the influence of stimulants on the average growth of one-and two-year-old seedlings at a reliable level. As a result of these studies, it has been revealed that the pre-sowing treatment of pine seeds with ordinary stimulants increases the average height of annual seedlings. However, the results obtained in this experiment depend on the region of nursery location, but the use of soil irrigation with an “EridGrow” activator has increased the average height in both nurseries: by 13.9% in the “Kokshetau” SNNP for one-year-old seedlings, by 37.2% for two-year-old seedlings compared with the average height of the control seedlings. For pine seedlings in the “Ertis Ormany” SFNR nursery the influence of the stimulants is insignificant, but the positive effect on the average growth with the “EridGrow” soil irrigation is a 7.3% increase in the first year and a 24.7% one in the second year.
Mapping of hazardous hydrological events in the Russian part of the Selenga River basin
Authors: Garmaev E Zh , Tsydypov B Z , Ayurzhanaev A A , Sodnomov B V , Pyankov S V , Shikhov A N , Abdullin R K
Published: December 2020

The Selenga River is a major tributary of Lake Baikal. Its basin is characterized by a fairly high degree of economic activity. Floods in the Selenga River basin are hazardous natural phenomena which can cause threats to people’s lives and enormous damage to the settlements and infrastructure. The flooded areas in the settlements are delineated by using various methods: hydro-morphological surveys, leveling of sections along riverbeds and floodplains (151 profiles in total), as well as results of hydrodynamic modeling of flooding processes by using a program, HEC-RAS, developed by U.S. Army Corps of Engineers. The flood zones are simulated for maximum water levels with 100, 33, and 20-years frequency. In the future, the compiled flood database is planned to be published as part of an online web map service, “Hydro-Ecological Safety in the Selenga River Basin”.
Analyzing extreme weather phenomena in northern regions in the context of modern climate change
Authors: Kuznetsova V P
Published: December 2020

At present, various world regions face statistically significant weather anomalies indicating transformations in the climate system. Climate change processes are manifested both at the global and regional levels under local physical and geographical conditions. Northern regions, where climate change is clearly observed, experience extreme weather phenomena able to affect the quality of land resources, livelihoods of the population, and the local economy. Depending on their distribution, manifestation, frequency and quantitative parameters, these phenomena are often characterized by a destructive potential which entails a need to monitor the unfavorable natural processes in order to take them into account when planning the territory. This paper analyses some dangerous hydrometeorological phenomena associated with climate changes observed in the Khanty-Mansiysk Autonomous Area Yugra.
Changes in climatic extremes of the south of Russia associated with El Niño events
Authors: Vyshkvarkova E , Sukhonos O
Published: December 2020

Spatial and temporal distributions of extreme temperatures and precipitation over the south of Russia in 1950–2018 are discussed, and their features are associated with El Niño events. Analysis of the temperature extremes shows some warming in the region during this study period. Extreme precipitation indices indicate upward tendencies on average in a region with strong spatial heterogeneity. The manifestations of some El Niño types in extreme temperatures are most noticeable in the winter-spring period, with warming during the eastern and cooling during the central type. The El Niño manifestations in extreme precipitation are less clear. Only the autumn season should be highlighted, when extreme precipitation is higher in the North Caucasus during the central El Niño type.