bluuebunny/crossref_metadata_2025 huggingface dataset:
The January barometer in emerging markets: new evidence from the Gulf Cooperation Council stock exchanges
Authors: Siriopoulos Costas , Youssef Layal
Published: November 2019

International investors’ interest in the capital markets in the region of Gulf countries has dramatically increased in last two decades. Thus, it would be motivating to investigate their characteristics, where the January anomaly is a major one. This paper studies the veracity of the January effect rule in the Gulf Cooperation Council (GCC) stock markets and examines the predictive power of January returns. Seven GCC stock markets are tested – the market indices in Bahrain, Abu Dhabi, Dubai, Kuwait, Oman, Qatar, and Saudi Arabia – from January 1, 2001 until December 31, 2018, a timeframe which has rarely been analyzed. Ordinary least square (OLS)-based dummy variable regression equation was used as the conventional econometric procedure in the works of financial calendar anomalies in stock markets. Some evidence is reported for the markets of Dubai and Kuwait. The paper also provides an additional explanation for the performance of stock market of Kuwait. The findings are opposite to the well documented evidence that emerging markets are less efficient and hence it is likely that several market anomalies are further pronounced. The results suggest that the predictive power of the January anomaly can be considered as a temporary anomaly in the GCC markets, since it is concentrated in only a couple of GCC markets and does not persist in time.
Parametric insurance applicability in Zimbabwe: a disaster risk management perspective from selected practicing companies
Authors: Nyagadza Brighton , Nyauswa Tatenda
Published: November 2019

This study seeks to explore the possibility of adopting parametric insurance to manage disaster risk in Zimbabwe. The background of the research is caused by recurrent natural disasters and the failure of the government to offer disaster relief after such events. The main objective of the research is to come up with the success factors of adopting parametric insurance to manage disaster risk and its effectiveness in African countries. The study population consists of 32 employees from seven reinsurance companies and 5 from a regulatory body. Self-administered questionnaires and interviews were used to collect the data. The study assumes that Zimbabwe does not have sufficient infrastructure to establish parametric insurance, and the lack of financial capacity is another major problem. 61% of respondents confirmed that they were underwriting natural disasters and the remaining 39% were not. The natural disasters that are being covered in insurance market and under which insurance products are used were at 61%. About 39% of the reinsurance companies that are not underwriting natural disasters cited the major reasons why they do not. Most of respondents confirmed that there was no support from the government to underwrite catastrophic risks. 57% of the respondents indicated that it is not possible to adopt parametric insurance, whilst 43% of the respondents agreed that it was practical. Recommendations are made for the government and insurance providers, which include use of catastrophe bonds, government incentives and support, the creation of a clearing house and the involvement of international organizations and developing countries in adopting parametric insurance.
Establishing field-based consulting experience for MBA students: Lessons learned by a small-sized university
Authors: R. Rink David , L. Preece Gloria , E. VanAlstine Jason
Published: November 2019

Most major universities expect MBA students to take a full-course load each term. Also, as a condition of graduation, MBA students must work full-time in small teams on focused-based consulting (FBC) projects for large-sized corporations. After being given the assignment and deadline, team members work tirelessly to complete their project. Such experiences facilitate the transition of major universities’ MBA students into the real business world. On the other hand, most MBA students at small-sized universities work full-time for a company during the day and take one or two courses in the evening each semester. Despite these constraints, Indiana University Kokomo (IUK) (Kokomo, Indiana, USA) was able to successfully develop and implement a required MBA-level FBC course (C599). In addition to having a positive influence on IUK’s MBA students, this course has had a significant impact upon the economic development of small-sized firms in northcentral Indiana. This paper chronicles the “trials and tribulations” the School of Business encountered in creating and executing C599. After presenting representative comments from client companies and MBA students, six implementation problems with C599 are discussed along with subsequent modifications. Finally, suggestions for small-sized universities like IUK who want to develop and implement their own MBA consultative course are presented.
Dynamical System of the Mathematical Model for Tuberculosis with Vaccination
Authors: Ludji Dian Grace , Sianturi Paian , Nugrahani Endar
Published: November 2019

This research focused on the modification of deterministic mathematical models for tuberculosis with vaccination. It also aimed to see the effect of giving the vaccine. It was done by adding vaccine compartments to people who were given the vaccine in the susceptible compartment. The population was divided into nine different groups. Those were susceptible individuals (S), vaccine (V), new latently infected (E1), diagnosed latently infected (E2), undiagnosed latently infected (E3), undiagnosed actively infected (l), diagnosed actively infected with prompt treatment (Dr), diagnosed actively infected with delay treatment (Dp), and treated (T). Basic reproduction number was constructed using next-generation matrix. Sensitivity analysis was also conducted. The results show that the model comprises two equilibriums: diseasefree equilibrium (T0) and endemic equilibrium (T*). It also shows that there is a relationship between R0 and two equilibriums. Moreover, the disease-free equilibrium point is asymptotically stable local when it is R0 < 1. Then, the disease-endemic equilibrium point is asymptotically stable local when it is R0 > 1. Furthermore, the parameters of β, ρ, and γ are the most important parameter.
The Proposed Maintenance Task for Plastic Injection Machine Using Reliability and Risk Centered Maintenance (RRCM) method in Manufacturing Industry
Authors: Maulidina Liza Nafiah , Atmaji Fransiskus Tatas Dwi , Alhilman Judi
Published: November 2019

The objective of this research was to determine the optimal maintenance time interval for the selected critical components and the total cost of maintenance of a plastic injection machine. In determining the critical components, a risk matrix was used, and three components were selected, namely, hydraulic hose, barrel, and motor. Using the Reliability and Risk Centered Maintenance (RRCM) method, the researchers got a proposed maintenance policy and the total maintenance cost. Based on the result, it shows that there are seven proposed maintenance tasks with three scheduled oncondition tasks and four scheduled restoration tasks with an average maintenance interval of two months. The total maintenance cost proposed is IDR91.595.318. The cost is smaller compared to the actual maintenance costs of the company.
Effect of change in position of particle dampers on wind turbine blade for vibration suppression
Authors: Sandanshiv Santosh R. , Chavan Umesh S.
Published: November 2019

Wind turbine energy minimizes due to vibration of blade. In this research we focus on vibration suppression by using particle damping technique. Containers are used for fill the particles and mounted on the blade. As vibration of blade increases, it increases the movement of containers along with particles this brings particle to particle and particle to container wall collision takes place which results to energy loss. In this study we use four different positions for mounting containers, firstly on all four different positions we mount containers simultaneously and take three readings for three different ball sizes respectively, keeping 50 % fill constant in all readings. Then we reduce one container among four and take the readings. Repeat this procedure up to single container. Compare with damping results with without damping results and finding out optimum locations for mounting of dampers.
Structural, shock and vibration analysis of special water filter
Authors: Venkateswaran N. , Prabu P. S. Chenthil , Murugesan R. , Chandrasekar R. P.
Published: November 2019

The present work is focused on the finite element analysis carried out on special water filter used in the marine application developed by CVRDE. This paper describes specifically on various type of analysis such as structural, shock analysis and modal analysis for the special water filter. The analysis is carried out using finite element method and compared it with the test results. It is observed that the shock test and sine sweep vibration test carried out is in line with the predicted finite element simulation. The filter assembly is designed in such a way that the natural frequency is away from resonance frequency. Thus, the special water filter has been validated through analysis using the finite element technique which help reduce the repeated testing of all the filters.
Influence of damping coefficient into engine rubber mounting system on vehicle ride comfort
Authors: Tan Hoang Anh , Quynh Le Van , Liem Nguyen Van , Cuong Bui Van , Long Le Xuan , Truyen Vu The
Published: November 2019

This study presents a method to improve vehicle ride comfort using additional damping coefficient values for an internal combustion engine (ICE) rubber mounting system. To analyze the effect of the adding damping coefficient values into the rubber mounting system on vehicle ride comfort, a full-vehicle vibration model with 10 degrees of freedom is established under the combination of road surface roughness and ICE excitations. The damping coefficient values are added into ICE rubber mounting system which are respectively analyzed and evaluated according to the international standard ISO 2631-1 (1997). The study results do not only evaluate the influence of the adding damping coefficients on vehicle ride comfort but also suggest the optimal design solution for ICE mounting system to improve vehicle ride comfort.
Computational fluid dynamics (CFD) modelling of hybrid photovoltaic thermal system
Authors: Saurabh Ashish , Atheaya Deepali , Kumar Anil
Published: November 2019

In this paper an attempt has been made to simulate and evaluate the distribution of temperature and heat flux for the hybrid photovoltaic thermal system with CFD (computational fluid dynamics) module in ANSYS 19.1 software. The simulation was carried to determine the temperature and heat flux across the different layers of HPVT (hybrid photovoltaic thermal) system. The temperature and heat flux were found to gradually decrease from the top glass layer to the bottom tedlar layer. The temperature varied from 36.4 °C (ambient) to 26.8 °C across the layers from top glass layer to bottom tedlar layer. The heat flux of (561.2 W/m2) at the glass layer due to solar insolation was also found to gradually decrease with the increasing thickness. The reduction in temperature and heat flux with increasing thickness is attributed to fluid flowing beneath the system. The water flowing beneath the tedlar layer takes the excess heat out of the photovoltaic layer, thereby increasing the efficiency of the hybrid photovoltaic thermal system.
Dynamic analysis of slider-crank mechanism with clearance fault
Authors: Xiao Shungen , Song Mengmeng , Zhang Zexiong
Published: November 2019

In this paper, the dynamic behavior of the slider-crank mechanism with clearance fault is investigated. The revolute joint with clearance is equivalent to a virtual massless rod, and then the dynamic equation of the crank slider mechanism with clearance is established by the Lagrangian method. In addition, a three-dimensional dynamic model of the crank slider mechanism with clearance is also established by ADAMS. The numerical results show that the clearance affects the displacement and velocity response of the crank-slider mechanism in a weak way, but influences the acceleration response of the mechanism in a significant manner. Due to the existence of the clearance, the revolute joint of the mechanism produces a rub-impact phenomenon, and the larger the clearance, the greater the impact strength. During the rub-impact process, there are three kinds of motion states of separation, collision and contact occur.
Effects of accelerometer mass on natural frequency of a magnesium alloy cantilever beam
Authors: Yadav Anuj , Singh N. K.
Published: November 2019

The aim of the paper is to study the effects of an accelerometer mass on natural frequency of a cantilever beam of AZ61 magnesium alloy. The fundamental natural frequency of the beam is determined experimentally using vibration analyzer OROS-34 for different location of accelerometer mass on the beam. Vibration in the beam is generated by a lightweight hand hammer. Analytical formulation is done to calculate modal properties of a mass loaded beam. Further, the problem is simulated using ANSYS and the simulated results are compared with the experimental and analytical results.
Effect of slant angle variation on the drag force for Ahmed body car model
Authors: Kumar Ashish , Singh Srijna , Bhalla Neelanchali Asija
Published: November 2019

In this paper, numerical investigation is carried out on two-dimensional Ahmed body model using Computational Fluid Dynamics in ANSYS Fluent 19.1. The 2-D model is designed in Catia v5 for 25°, 35° and 45° slant angles. The turbulent model used to analyze the flow dynamics is Realizable k-ε model. The drag coefficient variation with respect to slant angle is computed. The skin friction coefficient, wall shear stress and frictional velocity are also calculated.
Free vibration of circular annular plate with different boundary conditions
Authors: Jaiman Yash , Singh Baij
Published: November 2019

This paper deals with the numerical simulation of free vibration analysis of a thin circular annular plate for various boundary conditions at the outer edge and inner edge. Classical plate theory is used to derive the governing differential equation for the transverse deflection of the thin isotropic plate. The finite element method is used to evaluate the first six natural frequencies and mode shapes of the thin uniform circular annular plate with radius ratios (r1/r2) for different boundary conditions. These natural frequencies results are compared with those available in the literature. The results are verified with classical plate theory with our Abaqus results and checked with the previous research literature on the topic.
Computational investigation of cavitating flow around two dimensional NACA 4424 and MHKF-240 hydrofoil
Authors: Singh Srijna , Danish Mohammad , Saha Kaushik
Published: November 2019

This study focuses on the comparison of the performance of two unsymmetrical hydrofoils, NACA 4424 and MHKF-240 at 60 angle of attack under cavitation. The Schnerr and Sauer cavitation model along with Realizable k-ε turbulence model is used for numerical computation in commercial software ANSYS Fluent. The lift, drag and pressure coefficients for different cavitation numbers were studied. Among both the hydrofoils MHKF-240 gives a higher lift coefficient which is the parameter of better performance.
Impact on auxetic and metal foams
Authors: Kumar Nitish , Khaderi Syed Nizamuddin , Rao Koka Tirumala
Published: November 2019

Using the finite element method, we investigate the elasto-plastic impact of a rigid sphere on a half-space of auxetic and metal foams. The validity of the Hertz theory for elastic impacts is investigated for both positive and negative Poisson’s ratio. For elastic impacts, the results from Hertz theory are accurate within 20 % with the finite element simulations. The plasticity is modeled using the Deshpande-Fleck metal foam yield criterion. This yield criterion allows for plastic compressibility and can also accommodate materials having a negative Poisson’s ratio. The elasto-plastic simulations reveal that the coefficient of restitution decreases as the impact velocity is increased. The coefficient of restitution is also least for materials having a zero plastic Poisson’s ratio. Our study suggests for maximum energy dissipation the plastic Poisson’s ratio should be close to zero.
Numerical modelling of shear thickening fluid in nanosilica dispersion
Authors: Chauhan Vimal , Bhalla Neelanchali Asija , Danish Mohammad
Published: November 2019

In this paper, a numerical model of the shear thickening fluid (STF) is generated and the rheological properties are compared with the experimental data. Power Law model has been used to fit the rheological data for STF. Experimental data is taken from a performed study and a user defined function (UDF) has been written to develop the shear thickening behavior. The purpose of this study is to exactly model the behavior of shear thickening fluids by using UDF, to explain the shear-thickening mechanisms under different shear rates. Different parameters like viscosity, shear stress and velocity of the STF have also been reported.
Classification of diaphysis based on the mechanical response of femur bone
Authors: Gautam Diplesh , Rao Venkatesh K P
Published: November 2019

This work deal with the biomechanical analysis of the Captum Collum Diaphysis (CCD) femur bone. The femur is the largest bone in the upper leg. The angle between femur neck and femur shaft of the femora is a parameter in determining the CCD or FSA angle. 126 ° is the usual angle for a healthy adult and variation in this angle leads to the CCD. This angle in the femur bone helps in determining the knock knee and bow leggedness orthopaedic disease. This angle impacts on the distribution of stress and deflection in the femur bone during the daily activities. Computational Multi-Scale analysis has been done for homogenized properties of femur bone. A Numerical simulation has been made for the biomechanical analysis of CCD femur bone using Finite Element Method. There is significant impact of stress distribution and deflection over the femur bone in case of change in optimum CCD angle (coxa norma) and also leads to change the natural frequency of the bone. Predicted results shows the above mentioned disease behaviour over the healthy bone. The study of these deformity and their results are of clinical importance in musculoseketal behaviour of the human femur bone.
A breeze energy harvesting of vibration caused with a cantilevered piezoelectric beam
Authors: Li Jun , Zhang Ting , Wu Zidong , Zhang Guoguang
Published: November 2019

The researches of wind energy harvesting have been more and more popular in recent years. In the paper, a vibration energy caused by a breeze is harvested with a cantilevered beam using a piezoelectric patch. When a swaging fan applies a breeze environment, the alternating voltage generates from the piezoelectric patch. Moreover, by designing a full wave rectifier, the alternating voltage from the piezoelectric patch is transformed as a DC voltage. Through some experiments, the amplitude of the alternating voltage is about 2.70 V and its frequency is 2.60 Hz (the first natural frequency of the cantilevered beam). And the gained DC voltage is about 2.45 V and can be made a luminous diode be on. These experimental results indicate that vibration energy caused by the breeze can be harvested with a full wave rectifier.
Dynamic load effect on the transportation safety of tank containers as part of combined trains on railway ferries
Authors: Fomin Oleksij , Lovska Alyona , Píštěk Václav , Kučera Pavel
Published: November 2019

Maintaining the leading position of railway transport in the international transportation market led to the creation of its combined interaction with other modes of transport. In countries that have access to international traffic through the sea, rail-ferry services have been developed. At the initial stage of functioning of this symbiosis, only freight and passenger cars were transported by sea. At the moment, it has become possible to follow container trains on railway ferries by sea. An example would be the international Silk Road corridor, which connects Ukraine with China. Important components of this corridor are two rail-ferry routes through the waters of the Black and Caspian Seas.
Experimental study of self-sustainable hybrid solar photovoltaic cleaning mechanism coupled with water distillation unit
Authors: Guptaa Yash , Katakam Sai Manoj , Aligireddy Susheel Reddy , Shameer Waseem , Atheaya Deepali
Published: November 2019

In the present research work a novel self-sustainable hybrid solar photovoltaic cleaning mechanism coupled with water distillation unit has been proposed. The experiments were conducted on the PV (photovoltaic) modules at Bennett University, Greater Noida A-block terrace from 7th to 13th October, 2019. Post installation, the average efficiencies of the solar PV module system with and without cleaning were compared to obtain a hike by 1.34 %. The water used for cleaning was recycled using a single slope basin type solar still which indicated a working efficiency of 67.94 %. On an average the solar still yielded 5.3 Litres of pure water every day during the experiment with a TDS (total dissolved solids) level of 104 ppm.
Unknown input reconstruction in non-linear dynamical systems using homotopy optimization
Authors: Manikantan R. , Chakraborty Sayan , Vyasarayani C. P.
Published: November 2019

In this work, a homotopy optimization method is proposed for reconstructing unknown inputs in non-linear dynamical systems. The unknown inputs are parametrized using a B-spline basis. This parameterization of inputs converts the unknown input identification problem into a parameter identification problem. The unknown parameters are identified through an optimization process. The proposed homotopy-based optimization method is designed to converge to the global optimal solution instead of a local minimum. The unknown parameters are obtained through a series of iterations guided by a homotopy parameter and an optimization algorithm.
Vibration analysis of cantilever beam in time domain and frequency domain using Arduino platform
Authors: Reddy Chetan , Shenoy Sucheth , Sharma Ramesh S.
Published: November 2019

In this paper, analysis is made in the field of mechanical vibrations using Arduino and MATLAB code. Test was conducted on a cantilever beam to extract the first three natural frequencies. Two specimens made of Aluminium and Mild Steel were considered for the analysis. The frequencies were first determined using experimental setup utilizing Arduino and MATLAB, later verified with the help of two methods: (1) Traditional “strike method” using 8-channel FFT analyser with Data Acquisition System (2) Analytical solutions available in Robert D Blevins for idealized continuous beam model. The results obtained for both specimens through these methods were compared with Arduino MATLAB code and found to be in very good agreement. Hence, in this work an attempt is made with the use of Arduino to extract few frequencies for simple structures which is less expensive, fast and provides reasonably good results and can be a substitute for FFT analyser, which is very expensive and time consuming.
Hyperparameter optimization for enabling multi-level feature classification in a wind turbine gearbox
Authors: Inturi Vamsi , Chetti Karthick , N Shreyas , G R Sabareesh
Published: November 2019

Majority of the previous research investigations on fault diagnostics in a wind turbine gearbox are limited to binary classification, i.e., either detecting the type of defect or severities of defect. However, wind turbine gearbox consists of multiple speed stages and components, therefore performing the binary classification is not adequate. In the present study, a multi-level classification scheme which is capable of classifying the defects by stage, component, type of defect and severity level is proposed. Experiments are performed and the response is recorded through vibration, acoustic signal and lubrication oil analysis. Later, an integrated multi-variable feature set is achieved by combining the statistical features of the above mentioned individual condition monitoring strategies. Further, the obtained integrated multi-variable feature set is subjected to multi-level classification using various machine learning models and the learning model that best suits for carrying the multi-level classification is investigated. Finally, the hyperparameters of the learning models are optimized by an iterative process of reducing the objective function. It is observed that, optimized support vector machine model has yielded favorable results when compared to other machine learning models with the overall classification accuracy of 82.52 % for the four-level classification.
Numerical analysis of single grit grinding on aluminum workpiece
Authors: Bode Srinivasa Reddy , Kumar Ashish , Singh Baij Nath
Published: November 2019

Grinding is a finishing process used in almost every industry. The purpose of this research is to study the effects of grinding on aluminum. Finite Element Method (FEM) is used to numerically simulate grinding by using microscale modeling. It is found that though under grinding, stress mises developed do not exceed yield stress. The force variation and displacement parameters have been correspondingly discussed. The effects of grinding on the workpiece with and without lubrication.
Pozzolanic Mortars for Restoration of Sacred Tuff Masonry Structures
Authors: Guadagnuolo Mariateresa , Frunzio Giorgio , Monaco Michelina , Tafuro Anna
Published: November 2019

Recent earthquakes have shown the seismic vulnerability of the Italian Architectural heritage and the need of interventions. The restoration design should take into account not only assessment and rehabilitation, but also the need of fruition of the cultural assets. These aspects have been considered in the last Italian seismic codes, a performance-based set of technical requirements to be addressed in the design process. In this framework, the requirements that the materials, meant to repair or replace historic ones, should fulfill are a key issue. In particular, for tuff masonry structures, the evaluation of the mechanical characteristics of the mortar is essential. Tests performed directly on samples withdrawn on site are perhaps the most reliable tools to determine the strength characteristics of a mortar to be used for restoration. Unfortunately, the possible dimensions of the samples are not compatible with the minimum required for a reliable mechanical test, so that the characterization of the old mortars and their historic context can be made obtaining information by the treatises of the time: components and their proportions, together with curing operations are often reported in the manuals. In particular, in the Middle Age the Roman knowledge about pozzolanic mortars was somewhat lost, and the results can be seen in the durability problems of several monuments of the period. These last considerations are the motivations of this paper, in which a study of the pozzolanic mortars in tuff masonry structures is provided. As a case study, the tuff masonry structures of the Paleocristian Basilica in Cimitile are considered and examined.
Degradation of high-concentration simulated organic wastewater by DBD plasma
Authors: Wang Xing-Quan , Li Xing , Zhou Ren-Wu , Huang Jun , Chen Wei , Wang Feng-Peng , Lu Xiu-Yuan , Wen Qian
Published: November 2019

In this study, a high-concentration simulated organic wastewater, made by dissolving methyl violet in water, was degraded using dielectric barrier discharge (DBD) plasma generated in air and O2 respectively. The decoloration rate and chemical oxygen demand (COD) of wastewater were evaluated during plasma treatments with the initial concentration of methyl violet of 300 mg L−1. Results showed that the highest decoloration rate of around 100% within 10 min and the highest COD decrease of 33% within 60 min could be achieved with the O2 plasma treatment at the discharge voltage of 10 kV, while air plasma treatment showed lower efficiency in decolorizing the methyl violet solution and lower COD decrease (24%) after 60 min treatment. UV-Vis spectroscopy and chemical analysis of generated by-products during the plasma-enabled degradation process revealed that the methyl violet molecules could be completely decomposed into some refractory organics in the solution. Based on the experimental results and literature review, a pathway of methyl violet degradation attributed to energetic electrons and highly reactive species generated by DBD was proposed.
Federal Service of the Russian Federation National Guard Troops in the System of Bodies Ensuring the State and Public Safety
Authors: Buriakov Vadim Nikolaevich , Vorontsov Dmitrij Anatolevich
Published: November 2019

The article is devoted to the created powerful Federal Executive body – the Federal service of the Russian Federation national guard troops. The authors emphasize that the creation of this body was due to the desire to protect the rights and freedoms of man and citizen, and to ensure state, public and information security, which are the most important elements of the national security of the country. The tasks and powers of the Russian Federation national guard troops are described.
Main Approaches to Damage Assesment from Hazardous Processes (On the Example of the Central Federal District)
Authors: Burova Valentina Nikolaevna
Published: November 2019

This article discusses the manifestation of dangerous hydrometeorological processes in the Central Federal district. The analysis of manifestation dynamics of these dangers is carried out. The dependences of the hazardous processes cases number in general and by categories of on the temperature regime consequences are considered in the article. It was found out that within areas where average annual temperature exceeds annual temperature in the Central Federal district the number of hurricanes and heavy rains exceeds the average value, and the number of cases leading to negative consequences associated with blizzards and snowfall well below their average long-term manifestations, but the number of floods above their average values. The algorithm of calculation of forecast economic damages from manifestation of hydrometeorological dangers is offered.
Hervey Cleckley: A Man ahead of Time
Authors: Antsyborov Andrey Viktorovich , Dubatova Irina Vladimirovna
Published: November 2019

Hervey Cleckley is one of the most influential psychiatrists of the 20th century. Part of his scientific research still causes debates in the scientific world, especially his works about «successful psychopaths» and the curability of psychopathy. Most of Cleckley’s scientific works in the field of the study of psychopathy are well known to most modern scholars, and some of his articles have become textbooks. At the same time, his works on dissociative personality are less known in the professional community. Through the time, his scientific achievements have not lost their relevance and scientific novelty.
Information Technologies in Education
Authors: Myskova Anastasiya Evgenievna
Published: November 2019

The article deals with the issue of using the latest information technologies in education and provides examples of using them in this field. The significance and effectiveness of implementing and using the information technology in Russian education are also analyzed in this article. The study suggests that information technologies in education allow using a greater number of teaching methods than traditional techniques, and that they are an innovative way to improve and organize the educational process.
Surgical treatment of a patient with stent restenosis in the mouth of the general carotid artery and the proximal department of the internal carotid artery
Authors: Kazantsev A. , Burkov N. , Shabayev A. , Volkov A. , Ruban E. , Lider R. , Anufriyev A.
Published: November 2019

The results of surgical intervention on a patient with stent restenosis at the mouth of the common carotid artery (CCA) and proximal internal carotid artery (ICA) are presented herein. In 2013, the patient underwent stenting of the CCA and ICA. One month later, the aortic valve was replaced with a mechanical prosthesis MedEng-23 (MedEng, Penza, Russia) and mammarocoronary anastomosis with an envelope artery was performed under extracorporeal circulation. After the intervention, the patient regularly received 3.75 mg of warfarin, and was under the observation of a cardiologist. In 2018, the patient suffered a transient ischaemic attack. Subsequent examination of the patient revealed sub-occlusion of the left subclavian artery and signs of vertebral–subclavian steal syndrome on the left, and confirmed patency of the mammarocoronary shunt in envelope artery. The patient underwent carotid–subclavian shunting using the BASEX (A.N. Bakulev National Medical Research Center of Cardiovascular Surgery, Moscow, Russia) (8-mm prosthesis. Nine months after the patient underwent carotid–subclavian shunting, 85% restenosis was observed in the stent of the left ICA using control multi-spiral computed tomography with angiography (MSCT AG). The patient also exhibited up to 94% restenosis of the stent of the left ICA, occlusion of the right ICA, and up to 81% stenosis of the proximal anastomosis of the carotid–subclavian shunt. The patient underwent surgery for the removal of the following: the stent from the ICA with endarterectomy from the CCA, ICA with arterial plastic patches from the xenopericardium and prosthesis on the left (8-mm Vascutek prosthesis, Vascutek Ltd., UK). The brain was protected by raising the patient’s systemic blood pressure to 180/90 mm Hg. During the postoperative period, MSCT AG was performed to image the ICA. The MSCT AG images indicated that the prosthesis was passable. Presently, no clear standards exist for achieving revascularisation in this category of patients. The present clinical case emphasised the requirement for the detailed observation of patients after reconstructive interventions in different arteries as well as the possibility of surgically correcting the revealed lesions.Received 13 August 2019. Revised 8 November 2019. Accepted 9 November 2019.Funding: The study did not have sponsorship.Conflict of interest: Authors declare no conflict of interest.Author contributionsDrafting the article: A.N. KazantsevLiterature review: R.Yu. LiderIllustrations: A.R. Shabayev, A.N. VolkovCritical revision of the article: N.N. Burkov, A.I. AnufriyevPreoperative patient preparation: A.R. Shabayev, E.V. RubanPostoperative care: A.N. VolkovNeurological examination: E.V. RubanFinal approval of the version to be published: A.N. Kazantsev, N.N. Burkov, A.R. Shabayev, A.N. Volkov, E.V. Ruban, R.Yu. Lider, A.I. Anufriyev
Investigation of the cytotoxic effects of magnesium alloys on cell cultures
Authors: Frolova T. , Boykov A. , Tarkova A. , Orishchenko K. , Prokhorikhin A. , Malaev D. , Sinicyna O. , Baystrukov V. , Kretov E. , Pryamov M. , Merson D. , Vinogradov A.
Published: November 2019

Background. Metallic stent implantation is associated with an increased risk of adverse events, such as prolonged endothelial dysfunction, constant traumatisation of the vessel wall, chronic local inflammation and thrombosis. Thus, the development and manufacturing of bioresorbable stents, which maintain the required support during the vessel healing period and completely dissolve without any side effects, is highly relevant. At present, magnesium alloys are regarded the most applicable for this purpose due to their low corrosion resistance and high biocompatibility.Aim. To assess the cytotoxicity of different magnesium alloys in vitro.Methods. Using strain tempering, seven samples with different yield stress levels were produced: sample 1, MgZnZr (ZK60) 310 МPа; sample 2, MgZnCa (ZX10) 60 МPа; sample 3, MgZnCa (ZX40) 130 МPа; sample 4, MgYZn (WZ31) 300 МPа; sample 5, MgYZn (WZ31) 275 МPа; sample 6, MgYZn (WZ20) 340 МPа and sample 7, MgZnZr (ZK60) 180 МPа. The samples were incubated in a culture medium to obtain the extract, which was further tested on immortalised human fibroblasts. The cytotoxicity of the obtained extract was assessed using 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay, flow cytometry, optical microscopy and pH test.Results. In MTT assay, sample 7 was significantly cytotoxic (mean cell survival: 48% [2% ± 1%]), whereas sample 5 was slightly cytotoxic (mean cell survival: 81% [4% ± 14%]). In optical microscopy, the same samples showed the lowest cell density. In flow cytometry, the number of necrotic cells significantly increased in sample 7 (8.25%) and only slightly increased in samples 1 and 5 (3.449% and 3.626%, respectively). Furthermore, samples 5 and 7 showed the highest medium pH.Conclusion. The composition and strain tempering method magnesium alloys are directly correlated with the degree of cell necrosis, change in morphology and medium pH in vitro.Received 7 June 2019. Revised 28 October 2019. Accepted 6 November 2019.Funding: The work is supported by the Ministry of Science of Russian Federation (project RFMEFI58317X0070).Conflict of interest: Authors declare no conflict of interest.
Use of optical coherence tomography for intermediate coronary artery lesions
Authors: Ermolaev P. , Khramykh T. , Vyaltsin A.
Published: November 2019

Aim. To compare the results of interventions for intermediate coronary lesions, which were operated via angiography and optical coherence tomography (OCT).Methods. We performed a study including 130 stable patients with intermediate coronary lesions (40%–70%). The first group (n = 65) underwent angiography control; the second group (n = 65) underwent OCT control. Morphometric coronary indicators were analyzed intraoperatively. During the 12-month follow-up period, major adverse cardiovascular events incidence, angina recurrence frequency, restenosis, and stent thrombosis were assessed.Results. More pronounced coronary changes were noted in the OC group, as evidenced by stenosis indicators (51.5% [45.2–68.4] vs. 78.6 [65.7–80.3], p = 0.012), lesion length (18.4 mm [15.6–20.3] vs. 26.8 [24.6–32.2], p = 0.038), and plaque instability frequency (4.6% [3/65] vs. 12.3% [8/65], p = 0.048). In the OCT group, decision to perform stenting was more common (33.8% [22/65] vs. 83.1%) [54/65], p < 0.001). In stented patients, differences were noted in major adverse cardiovascular events frequency (13.6% vs. 0%, p = 0.021), angina return (36.3% vs. 3.7%, p < 0.001, odds ratio (OR) 14,857 [2,830–77,990]), and stent restenosis (31.8% vs. 1.8%), p < 0.001, OR 24,733 [2,817–217,125]), with an advantage in favor of OCT. In patients receiving drug therapy, differences were noted in angina recurrence frequency (60.5% vs. 18.1%, p = 0.005, OR 6,882 [1,322–35,824]), with an advantage in favor of OCT.Conclusion. The use of OCT for intermediate coronary lesions revealed prominent lesions and optimized intervention outcomes, accompanied by reduced major adverse cardiovascular events frequency, myocardial infarction, angina recurrence, and stent restenosis at 12 months.
Received 5 July 2019. Revised 29 October 2019. Accepted 5 November 2019.
Funding: The study did not have sponsorship.
Conflict of interest: Authors declare no conflict of interest.
Theoretical models of changes in haemodynamic parameters and gas exchange in univentricular circulation
Authors: Khubulava G. , Naumov A. , Marchenko S. , Chupaeva O. , Seliverstova A. , Pilyugov N. , Tereshenko O. , Aleksandrovich Yu. , Pshenisnov K. , Popova L. , Andreev M. , Nevmerzhitskaya O. , Volkov A.
Published: November 2019

Aim. To develop theoretical models of changes in haemodynamic parameters of patients with univentricular haemodynamics.
Methods. We analysed the effects of redistributing blood flow between the two circulatory systems (pulmonary and systemic) on systemic oxygen delivery and examined changes in the arterial and venous blood gas compositions. Mathematical analyses on the basis of oxygen flow into the pulmonary circulatory system and its consumption during circulation were performed according to Fick principle for cardiac output. Calculations were performed using equations describing changes in the delivery and consumption of oxygen during univentricular circulation. Furthermore, computer simulations were employed to investigate changes in haemodynamic parameters and gas exchange associated with pathological processes such as pulmonary venous hypoxemia, reduction in systemic flow rate and mixed venous blood desaturation. Calculations were performed under conditions with oxygen concentration of >0% or <100%.
Results. A number of theoretical models were developed, which described (i) the distribution of systemic and pulmonary blood flow and changes in arterial oxygenation depending on Qp/Qs; (ii) the ratio of systemic blood flow to Qp/Qs; (iii) changes in arterial oxygenation depending on Qp/Qs at different levels of central venous saturation; (iv) changes in pulmonary venous saturation depending on arterial saturation and Qp/Qs under conditions of normal and reduced blood flow; (v) level of central venous saturation depending on changes in Qp/Qs and SpvO2 at systemic SaO2 of 75% and (vi) PaO2 dynamics depending on changes in PpvO2 and Qp/Qs.
Conclusion. Changes in the oxygen status of patients with univentricular haemodynamics with sufficient combined cardiac output are indicative of the distribution of blood flow. Assessments of the developed models demonstrated that a number of additional factors affect changes in the oxygen composition of blood including (i) the initial level of arterial oxygenation; (ii) the level of oxygenation in the pulmonary veins and (iii) the ratio of pulmonary to systemic blood flow. In addition, the results indicated that PCO2 recorded in the pulmonary veins, arteries and mixed venous blood largely depends on Qp/Qs. The theoretical models presented here can be used to compare the results of haemodynamic status assessments of patients with univentricular physiology.
 
Received 22 May 2019. Revised 4 November 2019. Accepted 10 November 2019.
 
Funding: The study did not have sponsorship.
 
Conflict of interest: Authors declare no conflict of interest.
Haemostasis and minimally invasive extracorporeal circulation
Authors: Kornev V. , Shelukhin D.
Published: November 2019

Advances in extracorporeal circulation using a minimally invasive circuit have rapidly emerged, and the components and biocoatings of the minimally invasive extracorporeal circuit (MiECC) have improved. The application range of minimally invasive cardiopulmonary bypass has expanded, however the main indications for the use of MiECCs during cardiac surgery have not yet been systematized. To the best of our knowledge, no guidelines for anticoagulant therapy regimens during minimally invasive cardiopulmonary bypass exist, and its effect on blood loss and the activation of coagulation in the perioperative period remain unclear. The present review highlighted the components of the circuit and the practical aspects of using MiECC. We formulated indications for the use of minimally invasive circuits and classified biocompatible coatings used to reduce the contact activation of haemostasis. According to the literature, when performing cardiopulmonary bypass with MiECC, the physiological haemostatic balance is disturbed. The detected changes in plasma haemostasis do not allow drawing conclusions regarding the advantages of MiECC, despite its clinical benefits. Multicentre randomized trials that comply with the rules of the pre-analytical stage of haemostasis and use global tests (thrombin generation test, thrombodynamics test, etc.) are required. The available studies on the haemostatic system using MiECC are not adequate for determining whether MiECCs on a haemostatic system are recommendable. However, MiECCs allow physicians to get closer to the fast track cardiac surgery ideal.Received 7 October 2019. Revised 14 November 2019. Accepted 18 November 2019.Funding: The study did not have sponsorship.Conflict of interest: Authors declare no conflict of interest.
Effect of Glyoxal Modification on a Critical Arginine Residue (Arg-31α) of Hemoglobin: Physiological Implications of Advanced Glycated end Product an in vitro Study
Authors: Banerjee Sauradipta
Published: November 2019

Background:

Non-enzymatic protein glycation is involved in structure and stability
changes that impair protein functionality, resulting in several human diseases, such as diabetes and
amyloidotic neuropathies (Alzheimer’s disease, Parkinson’s disease and Andrade’s syndrome).
Glyoxal, an endogenous reactive oxoaldehyde, increases in diabetes and reacts with several proteins
to form advanced glycation end products through Maillard-like reaction.

Objective:

Human hemoglobin, the most abundant protein in blood cells is subjected to nonenzymatic
modification by reactive oxoaldehydes in diabetic condition. In the present study, the
effect of a low concentration of glyoxal (5 μM) on hemoglobin (10 μM) has been investigated
following a period of 30 days incubation in vitro.

Methods:

Different techniques, mostly biophysical and spectroscopic (e.g. circular dichroism,
differential scanning calorimetric study, dynamic light scattering, mass spectrometry, etc.) were
used to study glyoxal-induced changes of hemoglobin.

Results:

Glyoxal-treated hemoglobin exhibits decreased absorbance around 280 nm, decreased
fluorescence and reduced surface hydrophobicity compared to normal hemoglobin. Glyoxal
treatment enhances the stability of hemoglobin and lowers its susceptibility to thermal aggregation
compared to control hemoglobin as seen by different studies. Finally, peptide mass fingerprinting
study showed glyoxal to modify an arginine residue of α-chain of hemoglobin (Arg-31α) to
hydroimidazolone.

Conclusion:

Increased level of glyoxal in diabetes mellitus as well as its high reactivity may cause
modifications of the heme protein. Thus, considering the significance of glyoxal-induced protein
modification under physiological conditions, the observation appears clinically relevant in terms of
understanding hydroimidazolone-mediated protein modification under in vivo conditions.
An Efficient LUT Based Approach Towards Channel Coding in GSM and its Implementation
Authors: Sutar Swapnil , Mekala Priyanka , Goel Supriya
Published: November 2019

Background & Objective:

The channel coding improves the performance of the mobile
network link by adding redundant bits in the message in order to detect and correct the errors occurred
during transmission of the data. The traditional method involved in channel coding for
GSM has a number of operations, its computation time and complexity were very high which increases
the latency in communication. To reduce the latency, we propose a novel and efficient
Look Up Table (LUT) based implementation using Fire codes for Control Channel Coding in
GSM.

Methods:

In this research paper, a new and competent LUT based implementation towards channel
coding in GSM is projected. This proposed technique will significantly decrease the computation time
and number of cycles with less complexity. The suggested method improvises the coding scheme of
FIRE codes adopted in GSM communication system by reducing the number of shift operations to zero.

Results:

The proposed LUT based method outperforms the conventional method by reducing the
number of cycles, XOR operations, shift operations, execution time and memory consumption.
Our algorithm achieved around 89% improvement in Fire code implementation compared to Shift
and XOR method, which is, considered as significant growth for GSM communication system.

Conclusion:

The proposed technique demonstrated the significant improvement in reducing the
latency and memory usage in comparison to the conventional method.