bluuebunny/crossref_metadata_2025 huggingface dataset:
Particle Swarm Optimization and Texture Analysis Image Processing Techniques using MRI Images to Detect Brain Tumor in Human
Authors:   Assistant Professor, Dept. of Compter Science, Karnatak Science College, Dharwad, Karnataka, India, Naik* Lalitha R
Published: March 2020

Cosmetics and classification findings are the most difficult and powerful task of preparing. MRI (Magnetic Resonance Imaging) is a treatment, which is often used by the radio translator to represent the appearance of a person with no surgery. MRI provides much information on the human body's body, which helps to control the brain's brain. MRI is used for research on high resolution, speed of availability, and high profile profile for patients [19]. The deep part of the MRI shape is primarily responsible for the termination of the brain's brain from the computer that supports medical devices. This book focuses on planning the best way and the best way to diagnose MRI's brain detection if it supports brain arrest if its focus is on surveillance its vision is: benign or operated by using the SVM configuration process. The method we recommend is to create a configuration using the history and management of the process that will create a split by using a test feature (PSO), extracting compression using GLCM, reducing PCA features, to reduce the feature is also used by ICA (Self-Exam) to provide free access for the GLCM and for SVM format. The result is MATLAB2015.
Analysis of Transmission Tower u sing Stadd Pro
Authors:   civil department, Ujjain Engineering college ujjain, Madhyapradesh, India., Dhillon* Priya , Singh Raghvendra ,   civil department, Ujjain Engineering college Ujjain, Madhyapradesh, India.
Published: March 2020

Present days there are a lot of interest for power in the private and open parts in India has been expanded and to full fill, the interest of power a few activities is being taken by the legislature of India. From the source power to the customer the transmission tower is utilized as a transport framework. Right now, endeavor has been made to investigation a 36 m high transmission tower 3D model with the assistance of STAAD Pro (V8i) programming utilizing the codal arrangements of IS 800:2007 and furthermore the manual count of every part are determined for the examination as per codal arrangements.As per IS 875 (part III) code, the wind zone 3 height 36 m, landscape classification 2 and fundamental wind speed 39 m/sec are considered for the analysis. The damping ratio is 0.05 is also considered in the analysis. The results are concluded in terms of stability against wind force, structural, statically stable of all steel components.
Emission and Combustion Characteristics of Biodiesel with Dee Additive and Thermal Barrier Coated Piston
Authors:   Vinayaka Mission’s Kirupananda Variyar Engineering College, Salem, Tamil Nadu, India., Singh* Mr. Sanjay , Prabhahar Dr. M. ,   Professor in Aarupadai Veedu Institute of Technology, Chennai, Tamil Nadu, India
Published: March 2020

Continuous emissions of green house gases like carbon dioxide by industries and automobiles in atmosphere is increasing day by day and if not checked and regulated may bring disasters to human life. The existence and continuation of human life will be at risk. All technocrats, engineers and environmentalists have to work together for designing engineering systems and especially automobiles for combustion of fuels especially biodiesel which reduces emission of green house gases. Also there is a requirement of biodiesels to be renewable and obtained from biomass. The methyl ester produced from algae is used as a source of energy and is tested for its suitability in a variable compression ratio diesel engine (VCR). Blend B20 is added with 10% diethyl ether and tested for its combustion and emission characteristics with 200 micron zirconia coated piston. Improvement in performance is observed in comparison to the characteristics obtained with only coated piston and without additive.
WSN and IoT Based Monitoring of Various Macronutrient Parameters and Disease Control of Banana Crop
Authors:   Assistant Professor, E&TC Department, D.Y. Patil college of Engineering ,Ambi, Pune, Desai* Lina , Singh R.P. ,   Professor, Maulana Azad National Institute of Technology, Bhopal, MP, India., Khairnar D.G. ,   Professor, Electronics and Telecommunication Engineering, D.Y. Patil College of Engineering, Akurdi, Pune
Published: March 2020

In India, banana is an important fruit. In this research, we designed and develop a precision agriculture system to monitor the various macronutrients and various crucial parameters to control and early detection of various diseases of banana crop using Wireless Sensor Networks (WSN) and Internet of Things (IoT). Developed precision agriculture system is used various sensors to sense and measure various micronutrients like Magnesium (Mg), Calcium (Ca), Sulfur (S), nitrite content in soil, ground water quality, crop growth, pest detection, crop on line monitoring, animal intrusion into the field and so on. It also measures the different parameters like change in weather, temperature, humidity, moisture changes in soil, quality and fertility of soil, various weeds, and level of water. Precision agriculture system implemented using advance sensors and improved technologies like WSN, IoT. Research experimental results show significant improvement in quality of banana fruit and overall production of banana crop. Before design and implementation we have carried out a detailed literature review on various approaches of precision monitoring system using Internet of Things (IoT). Proposed precision agriculture system can be used to automate and complete control of all farming processes. Our major focused is on monitoring macronutrients like Magnesium (Mg), Calcium (Ca) and Sulfur (S) parameters, to supply balance macronutrients using automatic action and early detection of diseases and control of Banana Crops System which will result to increase the productivity and quality of Banana products. This precision agriculture system keep farmers/users updated and empowers with minimum manual tasks.
Development of Research Proposal Selection Based on Domain Ontology using K-Means Categorical Clustering
Authors:   Research Scholar, School of Computer Science, Engineering and Applications, Khajamalai Campus, Bharathidasan University, Tiruchirappalli, India., E.* Iyswarya , M. Balamurugan ,   Professor and Head School of Computer Science, Engineering and Applications, Khajamalai Campus, Bharathidasan University, Tiruchirappalli, India., N.J. Vinoth Kumar ,   Assistant Professor, Department of Electrical and Electronics Engineering, Government Polytechnic College, Nagercoil, India.
Published: March 2020

With the prompt improvement in research progress of various zones, selection of research proposals became a remarkable methodology in many research funding agencies and organizations. When a less number of research proposals are received, then it is ease to cluster the research proposals and the selection process became as non-problematic way. If a number of research proposals elevated, then the clustering and selecting the proposals became complicated. In current system, proposals grouping is done in manual-based or along with their similarities in subject disciplinaries which yield irrelevant results in some cases. The main goal of this research work is to develop an enhanced system in selection of research proposals based on Domain ontology, where the ontology acts as a searching criteria for the topics of research proposals. This proposed system will help to select the topics of research proposals in well-systematic way without the interference of manual progression. In this paper, an algorithm is proposed as Scikit-learn K-means Multiclass Document Clustering(SKMDC) to group each subject discipline according to their sub-topics and sub-domains. Here, the k-means clustering technique is implemented on categorical data to implement the clustering process. As, the categorical data are not able to applied directly in K-means clustering algorithm, the LabelEncoder method is implemented to encode the text data to numerical values and the dimensions of a dataset are reduced using Principal Component Analysis. This paper also overwhelms the weaknesses of k-means technique in specification of cluster number in initial stage. It is done through the determination of optimal number of clusters by using Elbow Curve method and it is cross-validated through Silhouette Score analysis.
Design and Implementation of Strong Authentication Model to Improve Performance of Cloud Computing in Hybrid Cloud Environment
Authors:   CSE Department, Mewar University, Chittorgarh (RJ), India,, Gupta* Anil , Mishra Durgesh Kumar ,   CSE Department, Sri Aurobindo Institute of Technology (SAIT), Indore, MP India
Published: March 2020

Cloud computing became a part of everyday life. We allow us to support the device with accessibility across platforms regardless of the location. It has become vulnerable to several security threats because of public environment and internet participation. At this point the attack by hackers can break down the security and leak the information. Data is recognized in the cloud computing as an important corporate asset which must be safeguarded from unwanted internal or external threats. Data encryption provides data protection on sensitive data but also raises computation and memory overhead during large data processing on cloud.Cloud computing also requires low overhead operation to keep the computation as soon as possible. To authenticate the client we apply modified Kerberos protocol.
Which ones are more important: characteristics or complexities? A study of the disclosure in local government financial reports
Authors: Purnama Hari Purnama , Alfina Putri
Published: March 2020

Local Government Financial Report (LGFR) is one form of local government transparency in financial reporting for a period. The study aims to determine the effect of characteristics as proxied by the assets and size of local government, and complexity as proxied by the number of LGFRs and size of Legislature on the extent of financial report disclosure of local government. The data employed in this study are Local Government Financial Reports from 9 Municipal Governments and 18 Regencial Governments in West Java for the period 2014-2017. The results of this study suggest that the asset and size of local government have a positive effect on the degree of financial report disclosure of local government. On the other hand, the number of LGFR and legislature size has no effect on financial report disclosure of local government.
PICA LEADING TO LITHOBEZOAR AND TRICHOBEZOAR IN ADULT MALE: A CASE REPORT
Authors: Sundararajan Bhuvana Lakshmi , Gowthaman Siddartha , Kumar Arul , M Ramanathan
Published: March 2020

INTRODUCTION: Pica is common in patients with developmental disabilities and can be life-threatening. It is
important to identify pica and manage it appropriately.
CASE REPORT:A 19-year-old male presented with history of abdominal pain and vomiting for two days.On imaging he
was found to have multiple foreign bodies within the small and large bowel.After trial of conservative management,he
was taken up for exploratory laparotomy. He was found to have trichobezoar and lithobezoar obstructing the bowel at
terminal ileum.Bezoars when removed via enterotomy.
DISCUSSION: Bezoars are conglomerates of non-absorbable food or fibre formed in the alimentary tract.Trichobezoar
forms following ingestion of hair and usually leads to gastric outlet obstruction.Lithobezoar refers to the accumulation of
stones in the GIT. Reports of colonic lithobezoar are rare. Pica is the persistent ingestion of non-nutritive substances
beyond a developmentally inappropriate age. Patients should be referred to a psychologist/behaviour analyst and
caregivers should also be educated
ANALISIS PENGENDALIAN KUALITAS KOPI PADA PRODUKSI KSU POM HUMBANG COOPERATIVE DENGAN METODE STATISTIC QUALITY CONTROL
Authors: Pardede Petrus Septo , Sinaga Christoper Janwar Saputra
Published: March 2020

KSU POM Humbang Cooperative merupakan usaha yang mengolah biji kopi menjadi kopi bubuk dengan 3 (tiga) jenis produk. Dimana dari 3 produk ada 2 diantaranya yang memiliki bahan baku yang sama tetapi dengan kualitas yang berbeda yang dikarenakan oleh adanya cacat pada raw material. Penelitian ini memiliki tujuan untuk menganalisis jenis cacat yang paling banyak terjadi pada produksi serta mencari penyebab adanya kecacatan tersebut dan mencari solusinya. Metode analisis digunakan adalah Statistical Quality Control (SQC), yaitu metode statistik yang mengukur sejauh mana proses pengendalian kualitas pada suatu perusahaan. Hasil dari penelitian ini diharapkan dapat menunjukkan penyebab kualitas produk KSU POM Humbang Cooperative belum terkendali atau masih ditemukan produk cacat. Dari grafik histogram, didapatkan jenis cacat yang paling sering terjadi adalah pada biji pecah sebanyak 376.5 kg kemudian biji busuk sebagian sebanyak 219.2 kg. Faktor yang menjadi penyebab terjadinya cacat pada produksi adalah tenaga kerja yang kurang fokus dan kurangnya pengecekan, mesin yang digunakan tidak sesuai dengan spesifikasi, bahan baku yaitu biji yang kurang kering dikarenakan penjemuran yang masih manual, dan metode yang digunakan dimana penjemuran terlalu cepat dikarenakan belum adanya penjadwalan dalam penjemuran biji kopi.
ANALISIS PENGENDALIAN KUALITAS PRODUKSI KANTONG SEMEN DENGAN SEVEN TOOLS
Authors: Sanusi  , Abdurahman Nandar Cundara , Arifin Ahmad
Published: March 2020

Pengendalian kualitas produksi pada perusahaan baik perusahaan jasa maupun perusahaan manufaktur sangat diperlukan. Dengan kualitas jasa ataupun barang yang dihasilkan tentunya perusahaan berharap dapat menarik konsumen dan dapat memenuhi kebutuhan serta keinginan konsumen. Banyak perusahaan yang menggunakan metode tertentu untuk menghasilkan suatu produksi dengan kualitas yang baik. Kebijakan pengendalian kualitas dan standarisasi terhadap proses pengantongan semen dilakukan juga  oleh PT. Semen Bosowa Indonesia. Hal ini dilakukan agar proses pengantongan semen lebih berkualitas dan tidak terjadi kerusakan berupa kantong jebol dan kantong bocor.  Penelitian ini berfokus pada produksi semen yang berkapasitas 1.200.000/ tahun apabila terjadi defect pada produk akan menyebabkan kerugian dan menurunkan kualitas produksi. Untuk itu perlu diketahui jumlah defect yang terjadi serta langkah-langkah untuk mengurangi defect pada pengantongan semen. PT. Semen Bosowa Indonesia adalah salah satu anak perusahaan dari Bosowa Group di mana perusahaan yang bergerak dalam bidang manufacturing, yang berada di kawasan industri kabil batam, yang di mana PT. Semen Bosowa Indonesia berada di bawah bendera Bosowa Group yang berpusat di Indonesian bagian Timur tepatnya di Makassar Sulawesi Selatan serta mempunyai kantor pusat di Jakarta. Bosowa group di dirikan oleh Bapak H.M. Aksa Mahmud. PT Semen Bosowa Indonesia bergerak dalam industri manufaktur yang kegiatan utamanya memproduksi semen. Semua kegiatan produksi perlu dilakukan pengendalian terutama pengendalian kualitas untuk menjaga mutu produk tersebut. Maka dari itu tujuan penelitian ini dilakukan untuk mengidentifikasi pengendalian kualitas proses pengantongan semen yang cacat (defect) atau rework pada stasiun kerja packing menggunakan pengendalian kualitas dengan metode Seven Quality Tools dengan mengetahui mengetahui faktor penyebab defect pada proses pengantongan semen. Berdasarkan hasil penelitian dan analisa data di unit pengantongan semen Bosowa Indonesia sesuai metode Seven Quality Tools dapat diketahui jumlah produksi selama 2 bulan sebanyak 169.795 pcs dengan defect sebanyak 312 , dengan persentase tingkat defect yang terjadi adalah sebesar 0,2%. Defect yang paling sering terjadi adalah kantong jebol sebanyak 180 pcs, dengan persentase sebesar 57,69%. Sedangkan kantong semen yang bocor sebanyak 132 pcs, dengan persentase sebesar 42,30%.
Cervical Tuberculosis Infection and its Treatment
Authors: Copete-González Ivan , Ferràs-Tarragó Joan , Bas-Hermida Teresa
Published: March 2020

Background: Extrapulmonar tuberculosis (TBC) frequently includes vertebral
affection but cervical levels are the less frequently affected. Its clinical
presentation is very variable depending on the age. Both the low frequency and the
clinical variations are the reason because its treatment in children is controversial
and different depending on the hospitals.
Methods: We show a 3 years woman with an cervical abscess and spondylodiscitis
because extrapulmonar TBC which presented with medullar and tracheal
compression. Patient needed anterior and posterior approach during the surgery to
release of the compression and arthrodesis.
Results: Clinical symptoms resolved after surgery. No new signs neither symptoms
after 18 months of fellowship and Magnetic Resonance Image (MRI) controls.
Conclusions: According with bibliography and our own experience, we recommend
to personalize each treatment for each patient to the correct treatment of this
disease, overall in the strange cases when surgery will be needed
THE INFLUENCE OF SILICON DIOXIDE «KOVELOS-SORB» ON GROWTH CHARACHTERISTICS OF RHODODENDRON ROSEUM (LOISEL.) REHDER CULTIVATED IN VITRO
Authors: Nemtsova Ye. V. , Harin A. V. , Razlugo I. A.
Published: March 2020

The article reveals a stimulating effect of synthetic amorphous silicon dioxide on growth parameters Rhododendron roseum (Loisel.) Rehder, propagating itself in vitro . The purpose of this study was to identify the optimum composition of culture medium on the basis of amorphous silica ‘Kovelos-Sorb’, used for clonal micropropagation of rhododendrons. It was established that it is preferable to add to Anderson culture medium 100 mg/L of amorphous silicon dioxide, which stimulated the growth of mericlone germs Rhododendron roseum (Loisel.) Rehder. In order to stimulate propagation and for receiving a vast amount of propagating material, it was optimal to use Anderson medium which contained 50 mg/L of amorphous silicon dioxide. For establishment of regenerative plants Rhododendron roseum (Loisel.) Rehder in vitro, it was optimal to use Anderson medium which contained synthetic amorphous silicon dioxide in amounts of 50-150 mg/L combined with indoleacetic acid in amounts of 1.5 mg/L.
Оценка производительности причала для целей имитационного моделирования
Authors: Kuznetsov A.L. , Galin A.V. , Semenov A.D. , Vinogradova E.V.
Published: March 2020

В работе отмечается, что одной из наиболее актуальных задач имитационного моделирования в области морских контейнерных перевозок является взаимодействие между собой контейнерных терминалов одного порта или нескольких портов морского побережья (морского фасада хинтерленда).По этой причине в статье рассматриваются методы оценки производительности причала, основанные на статистических данных и методе Монте-Карло, преимуществом которых является возможность оценить производительность всех операций контейнерного терминала с учетом случайного характера продолжительности отдельных движений путем наблюдения лишь за некоторыми, наиболее часто встречающимися операциями. Эти методы могут использоваться для решения задачи о взаимодействующих терминалах, когда суда осуществляют погрузо-разгрузочные операции на нескольких терминалах порта в рамках одного судозахода. Информация о производительности причала позволяет промоделировать данную систему без учета внутренних процессов контейнерного терминала. В работе доказывается, что существует зависимость между производительностью причала и размером судозахода судна. Корреляционно-регрессионный анализ позволил выявить наиболее подходящие формы зависимости линейную и степенную. В работе также получены оценки разброса выявленных зависимостей для целей имитационного моделирования. Полученная зависимость доказывает адекватность аналитических рассуждений о производительности причала, представленных в предыдущих работах.

The paper notes that one of the most important tasks of simulation in the field of container shipping is the interaction of container terminals of one port or several ports of the sea coast (sea front of the hinterland) .For this reason, the article discusses methods for assessing the performance of a berth based on statistical data and Monte Carlo method, the advantage of which is the ability to evaluate the performance of all operations of the container terminal, taking into account the random nature of individual movements by monitoring only for some of the most frequently used operations. These methods can be used to solve the problem of interacting terminals when ships carry out loading and discharging operations at several port terminals within the framework of a single call. Information about the berth productivity allows to simulate this system without taking into account the internal processes of the container terminal. The paper proves that there is a relationship between the berth productivity and the size of the ships call. Correlation-regression analysis revealed the most appropriate forms of dependence - linear and power-law. The paper also obtained estimates of the spread of identified dependencies for the purpose of simulation. The obtained dependence proves the adequacy of analytical reasoning about the performance of the berth presented in previous works.
Выбор порога селекции сигнала по уровню в обнаружителях с нормализованным индикаторным процессом
Authors: Egorov S.B. , Gorbachev R.I.
Published: March 2020

Предложена вероятностная модель работы автономного обнаружителя на этапе ожидания сигнала, когда момент появления сигнала неизвестен и по этой причине решающая статистика, сравниваемая с порогом, формируется непрерывно во времени в режиме скользящего окна . Ложная тревога в этом случае эквивалентна появлению хотя бы одного выброса помехового индикаторного процесса выше порога на максимально возможном интервале ожидания сигнала. Высота порога такова, что ложные выбросы являются редкими событиями, подчиняющимися закону Пуассона. На основе такой вероятностной модели показано, что вероятность ложной тревоги равна среднему числу ложных выбросов на максимально возможном интервале ожидания сигнала. Для обнаружителей с нормализованным индикаторным процессом получены соотношения, определяющие порог селекции сигнала по заданной вероятности ложной тревоги на заданном максимально возможном интервале ожидания сигнала. Показано, что в определении порога важную роль играет средняя квадратичная частота флюктуаций помехового индикаторного процесса. Дана численная оценка увеличения порога по сравнению с его значением, определенным по вероятности ложной тревоги в точке . Показано, что определение порога по предложенной методике особенно актуально для обнаружителей, работающих в длительном автономном режиме.

This article proposes a probabilistic model of the autonomous detector in standby mode, when the moment of the signal appearance is unknown and for this reason the decisive statistics is generated continuously in time in the sliding window mode and compared with the threshold value. In this case, false alarm is equivalent to the appearance of at least one outlier of the jamming indicator process above the threshold at the maximum possible signal waiting interval. The threshold level match case when the false alarm are rare events and obey the Poisson law of distribution. Based on such a probabilistic model, we show that the probability of a false alarm is equal to the average number of false emissions at the maximum possible interval for a signal waiting. For detectors with a normalized indicator process, are obtained relations that determine the threshold for signal selection by a given probability of false alarm at a given maximum possible signal waiting interval. It is shown that in determining the threshold, the mean square frequency of fluctuations of the interference indicator process plays an important role. Also, a numerical estimate of the increase in the threshold is given compared with its value determined by the probability of false alarm at a point . It is shown that the determination of the threshold by the proposed method is especially relevant for detectors operating in a long autonomous mode.
Разработка и исследование математической модели проектирования патрульного катера для Союза Мьянма
Authors: Gaikovich A.I. , Nikitin N.V. , Pyae S.
Published: March 2020

В статье описывается математические модель проектирования для обоснования концепции патрульного катера, предназначенного для Союза Мьянма. Основные кораблестроительные элементы определяются как результаты решения задачи математического программирования (оптимизации). В состав математической модели входят расчеты нагрузки, вместимости, остойчивости, ходкости, запаса плавучести. Критерием эффективности взято отношение вероятности перехвата нарушителя к приведенным годовым затратам. Для решения оптимизационной задачи используется алгоритм случайного поиска. Для реализации разработанной математической модели проектирования создан программный комплекс модульной архитектуры в оболочке DELPHI. В рамках исследования математической модели оценивалась её адекватность, чувствительность и устойчивость. Результаты исследования оказались удовлетворительными, что доказывает возможность применения разработанной математической модели для решения проектных задач на начальных стадиях разработки проекта патрульного катера.

The article describes a mathematical design model to substantiate the concept of a patrol boat intended for the Union of Myanmar. The main shipbuilding elements are defined as the results of solving the problem of mathematical programming (optimization). The mathematical model includes calculations of the load, capacity, stability, propulsion, stock of buoyancy. The efficiency criterion is the ratio of the probability of interception of the intruder to the given annual costs. To solve the optimization problem, a random search algorithm is used. To implement the developed mathematical design model, a software package of modular architecture in the DELPHI shell was created. As part of the study of the mathematical model, its adequacy, sensitivity, and stability were evaluated. The research results were satisfactory, which proves the possibility of using the developed mathematical model to solve design problems in the initial stages of the design of a patrol boat project.
Комплекс физико-математического моделирования при функционировании мультиагентных систем
Authors: Nechaev YU.I.
Published: March 2020

Рассматривается повышение эффективности функционирования мультиагентных систем при использовании программного комплекса физико-математического моделирования (ФММ). Функциональные элементы комплекса обеспечивают контроль экстремальных ситуаций на основе динамической модели современной теории катастроф (СТК), интегрирующей интеллектуальных технологии и высокопроизводительные вычисления. Особенности построения комплекса связаны с развитием новых подходов к физико-математическому моделированию динамики сложных систем в эволюционирующей среде. Вычислительная среда эволюционной динамики представлена как активная динамическая система (АДС) на основе совокупности взаимодействующих интеллектуальных агентов (ИА) в среде мультиагентного моделирования (Multiagent Modeling System MMS), обеспечивающей информационные и управляющие связи, реализующие модель коллективного интеллекта при взаимодействии ИА в режиме экстренных вычислений (Urgent Computing UC) 1 5. Модели контроля экстремальных ситуаций разрабатываются в рамках логического базиса нечеткой формальной системы (НФС). Приведены примеры реализации разработанной стратегии в бортовых интеллектуальных системах новых поколений.

An increase in the efficiency of multi-agent systems is considered when using the software package for physical and mathematical modeling (FMM). The functional elements of the complex provide control of extreme situations on the basis of a dynamic model of modern catastrophe theory (MCT), integrating intelligent technologies and high-performance computing. Features of the complex construction are associated with the development of new approaches to the physical and mathematical modeling of the dynamics of complex systems in an evolving environment. The computing environment of evolutionary dynamics is presented as an active dynamic system (ADS) based on a set of interacting intelligent agents (IA) in a Multiagent Modeling System (MMS), which provides information and control communications that implement the collective intelligence model in the interaction of IA in urgent computing mode (Urgent Computing - UC). Models for controlling extreme situations are developed within the framework of the logical basis of the fuzzy formal system (FFS). Examples of the implementation of the developed strategy in the onboard intelligent systems of new generations are given.
Определение расходных характеристик сопловых аппаратов с сверхзвуковыми прямоугольными соплами при моделировании переменных режимов малорасходных турбин
Authors: Simashov R.R. , Chekhranov S.V. , Khankovich I.N.
Published: March 2020

В работе приводятся обобщающие зависимости коэффициентов расхода сопловых аппаратов с сверхзвуковыми прямоугольными соплами в широком диапазоне изменения определяющих геометрических и режимных параметров, базирующиеся на экспериментальном материале по коэффициентам расхода для транс- и дозвуковых решеток профилей. Получены эмпирические формулы, учитывающие влияние степени конфузорности, относительной высоты сопел и числа Рейнольдса на коэффициент расхода соплового аппарата. Показано слабое влияние на коэффициент расхода относительного шага сопел в области его оптимальных значений определенных по минимуму потерь кинетической энергии и числа Маха. Переменные режимы работы сопла учитываются зависимостью относительного коэффициента расхода в функции от числа Рейнольдса. Полученные в работе эмпирические зависимости позволяют использовать их при моделировании переменных режимов и многорежимной оптимизации малорасходных турбин.

The research introduces generalizing functions of mass flow rates in supersonic rectangular nozzle diaphragms in wide variation range of controlling geometry and duty parameters, based on experimental material on the mass flow rates for trans- and subsonic cascades. Empirical functions which take into account influence of convergence ratio, the relative height of the nozzles and the Reynolds number on the mass flow rate of nozzle diaphragms are obtained. It is shown that the relative nozzle step in the area of its optimal values determined from the minimum kinetic energy loss and Mach number slightly effects on the mass flow rate. Variable duties of the nozzle are taken into account by the dependence of the relative mass flow rate from the Reynolds number. The empirical dependences obtained in the paper allow using them in modeling variable duties and multimode optimization of low-consumption turbines.
Результаты экспериментальных исследований по обнаружению пловцов при развитой структуре интерференционного гидроакустического поля в прибрежной акватории берегового клина
Authors: Viktorov R.V. , Lipovetskiy A.O.
Published: March 2020

В статье показано, что прилегающая к особо важным объектам акватория берегового клина, остается не освещенной, и при подсветке высокочастотным сигналом, в ней формируется интерференционное гидроакустическое поле, в котором можно регистрировать движущихся пловцов. Рассматривается механизм возникновения амплитудной модуляции при отражении гидроакустического сигнала от взволнованной морской поверхности. Приведены результаты компьютерного моделирования, а также лабораторных исследований, показывающие принципиальную возможность выделения на приемном устройстве амплитудных флуктуаций, вызванных движением подводного объекта в созданном интерференционном поле. Представлена модель адаптивного компенсатора помех, а также приведены результаты натурных экспериментальных исследований, которые показывают, что предлагаемый компенсатор позволяет подавить помеху, вызванную отражением высокочастотного сигнала от взволнованной поверхности на приемном устройстве и выделить амплитудные флуктуации, вызванные движением пловца. Показана эффективность снижения среднеквадратической ошибки помехи на измерительном приемном устройстве после адаптивного компенсатора, а также предложена схема обнаружителя движущегося подводного объекта.

The article shows that the water area of the coastal wedge adjacent to particularly important objects remains unlit, and when illuminated by a high-frequency signal, an interference hydroacoustic field is formed in it, in which moving swimmers can be registered. The mechanism of occurrence of amplitude modulation at reflection of a hydroacoustic signal from the agitated sea surface is considered. The results of computer simulation and laboratory studies are presented, showing the principal possibility of isolation on the receiving device amplitude fluctuations caused by the movement of an underwater object in the created interference field. The model of adaptive interference canceller and the results of field experimental studies, which show that the proposed compensator can suppress interference caused by reflection of high-frequency signal from the rough surface on the receiving device and to allocate the amplitude fluctuations caused by the movement of the swimmer. The efficiency of reducing the RMS error of interference on the measuring receiver after the adaptive compensator is shown, and the scheme of the detector of a moving underwater object is proposed.
Определение весовых коэффициентов по факторам влияния эргатического элемента судна на морскую аварийность в Дальневосточном регионе
Authors: Druz I.B. , Gomzyakov M.V.
Published: March 2020

Проведен анализ аварийности морского флота в дальневосточных морях за период 2011-2018 гг. Целью работы является установление весовой доли эргатического элемента, структурированной по функциям и уровням ПДНВ-78 с поправками 2010 года, в создании предпосылок к аварии при эксплуатации судовых энергетических установок и их основных элементов: главных и вспомогательных двигателей, рулевых машин, электрических и других систем. Основные задачи для достижения цели: анализ аварийности на предмет некорректной функциональности судового персонала согласно минимальным стандартам компетентности международной конвенции ПДНВ-78 с поправками определение меры ответственности причастных к АС лиц определение эргатических весовых коэффициентов и направлений для их практического применения. Результаты исследования имеют большое значение для прогнозирования безопасной эксплуатации судов и их судовых энергетических установок в дальневосточном регионе.

The article contains the analysis in the sea accidents at Far Eastern region for the period 2011-2018. The main idea of the article is the finding of ergatic weights of human factor in the accidents at sea into STСW-78 with amendments standards, and the role of the human factor in creating of the failures for the ships power plants background. Most of failures of ship technical equipment are: breakdowns of the main engines, auxiliary diesel generators, auxiliary mechanisms, steering gear, electrical equipment, automation systems. The main objectives of the article is crew competency analysis involved in the accident with failures of ship technical equipment, finding of ergatic weights of human factor, forming a base of ergatic scales in the format of professional competences, making practical recommendations. Research findings are important for making the forecast of shipping safety, safety ship control and reliable operation of power plants at Far Eastern region.
Определение оптимального числа причалов в порту
Authors: Lugovets A.A. , Sirotkin A.D. , Terenteva L.V. , Funtusov A.A.
Published: March 2020

Определение числа грузовых причалов является одной из основных задач, решаемых при проектировании морских терминалов. Согласно Нормам технологического проектирования морских портов, потребное число грузовых причалов определяется в зависимости от грузооборота порта, месячной пропускной способности и коэффициента занятости причала. Для контейнерных терминалов значение коэффициента занятости причала рекомендуется принимать равным 0,4-0,5. В статье показано, что такой подход к определению оптимального числа причалов является не вполне корректным и может приводить к существенным просчетам. В статье рассматривается более корректный метод решения задачи с применением методов теории массового обслуживания. В качестве критерия оптимальности используется комплексный оценочный показатель минимальные суммарные издержки вследствие простоев судов и причалов.

Number of berths is one of the key parameters in the design of a port terminal. The Guidelines for the design of seaports approved by the Ministry of Transport suggest that the number of berths should be determined using a formula which is based mainly on the cargo throughput, the ship loading (discharging) rate and the berth occupancy factor. For container terminals the recommended value of the berth occupancy factor is 0.4-0.5. The aim of this article is to show that such approach to determining the optimum number of berths in a seaport can be quite misleading because it ignores the fact that optimum berth utilization is dependent on a number of various factors and can vary over a very widerange. A more accurate queueing-theory-based approach to determining the optimum number of berths is proposed.
Методика для трибодиагностики судовых крейцкопфных дизелей на основе имитационного моделирования
Authors: Golenishev A.V. , Nadezkin A.V. , Starchenko M.E.
Published: March 2020

Рассматриваются подходы по определению пороговых значений концентрации продуктов износа в отработанном цилиндровом масле, характеризующие переход объекта диагностирования судового крейцкопфного дизеля из одного технического состояния в другое. Показано, что существующие методики не учитывают индивидуальные особенности и техническое состояние деталей цилиндропоршневой группы. Предложено для решения задачи их трибодиагностики использовать разработанную имитационную модель, позволяющую провести моделирование процесса изнашивания цилиндровой втулки и поршневых колец судового дизеля и на основании полученных расчетов определить концентрацию продуктов износа поступивших в отработанное цилиндровое масло при различной скорости изнашивания трущихся деталей. Данные о фактической концентрации продуктов износа в отработанном цилиндровом масле в дальнейшем соотносятся с результатами моделирования, что позволяет оценить техническое состояние деталей цилиндропоршневой группы двигателя. Представлены результаты моделирования по определению пороговых значений концентрации продуктов износа в отработанном цилиндровом масле, характеризующее переход судового дизеля из исправного в несправное техническое состояние. Даны практические рекомендации по выбору пороговых значений содержания продуктов износа в отработанном цилиндровом масле для различных типов судовых крейцкопфных дизелей и условий их эксплуатации.

The article examines approaches to determine the threshold values of the concentration of wear debris in used cylinder oil that characterize the transition of a ship crosshead diesel engine unit under test from one technical condition to another. It is shown that the existing methods do not take into account the individual characteristics and technical condition of the parts of the cylinder-piston group. To solve the problem of tribodiagnostics, it is proposed to use the developed simulation model, which allows modeling the wear process of the cylinder bushing and piston rings of a marine diesel engine and, based on the obtained results, determining the concentration of wear products issued in the used cylinder oil at different wear rates of the moving parts. The data on the actual concentration of wear products in the used cylinder oil are subsequently correlated with the simulation model results, which makes it possible to evaluate the technical condition of the parts of the engine cylinder-piston group. The article presents the results of modeling of threshold values determination of the concentration of wear products in used cylinder oil, that measure the transition of a marine diesel engine from a working condition to a malfunctioning technical condition. Practical recommendations are given on choosing threshold values for the concentration of wear products in used cylinder oil for various types of marine crosshead diesel engines and their operating conditions.
Domestic Tourism: Challenging the Notion Through a Geopolitical Lens
Authors: Timothy Dallen J.
Published: March 2020

This article argues that the traditional way of defining and measuring domestic tourism may be overly simplistic and is not necessarily as straightforward as is commonly thought. This discussion provides insights into certain geographic conditions and spatial anomalies that give cause
to rethink situations that might be labeled "domestic tourism" but that in reality may not be truly domestic, or that might deviate from the strictest tenets of the domestic tourism phenomenon. Conditions of travel between noncontiguous territories, the effects of a country's size or shape,
a country's physical geography and accessibility, visiting contested territories or sections of partitioned states, and international sameday excursions while visiting a domestic destination call into question the customary measure of travel within one's country of residence as the only defining
criterion of domestic tourism. These exceptions to the normative practices of domestic travel have important policy, legislative, management, and research implications.
Insights for farmer training programs from system dynamics: A case study from Northern Michigan
Authors: Schmitt Olabisi Laura , Elegbede Obafemi , Raven Matt
Published: March 2020

Training programs for new farmers are proposed as a solution to rural food insecurity, rural development, and the recruitment and training of younger farmers simultaneously. However, evaluation of these programs and evidence for their individual or collective impact is sparse. In this paper, we use in-depth interviews combined with an exploratory model to evaluate the current and potential effectiveness of a farmer training program in Michigan’s Upper Peninsula. We use the model to represent the theoretical progression of farmers through three subsequent stages of skill acquisition: training, new farmer (practicing skills on land owned by the program) and experienced (farming on their own). We find that recruitment, access to local markets, rapidity of skill acquisition, and access to start-up costs are all important factors that facilitate trainees’ transition to farming on their own, but of these, start-up costs for independent farming appear to be the most significant barrier. While this model is exploratory and not predictive, these insights can inform the design of effective programs for training farmers. In addition, this study also demonstrates how systems dynamics can be a valuable method to evaluate and maximize the effectiveness of training programs.
MARKERS OF ANGIOGENESIS IN PATIENTS WITH ALOPECIA AREATA
Authors: Serbina Inessa Mykhailivna
Published: March 2020

This study was aimed to evaluate the level of production of angiogenesis markers, namely VEGF, sVEGFR1, EGF and NO system in 67 patients with alopecia areata, depending on the pathology severity and activity. The content of stable metabolites of NO (NO2 and NO3) and NOS was studied in blood plasma using a spectrophotometric method. Growth factors and sVEGFR1 were investigated in serum by solid enzyme−linked immunosorbent assay. At an active stage with a moderate to serious severity of alopecia areata, the VEGF value was significantly higher. In chronic course, the VEGF level was significantly decreased at all severity levels, but the minimum was observed in the patients with a severe stage. The most significant decrease in the concentration of sVEGFR1, an increase in the content of EGF was diagnosed at an active stage with a severe alopecia areata. With signs of disease progression to severe stage, the level of NO, NO3, iNOS was as high as possible. At a chronic stage, their significance was significantly reduced relative to secretion in active manifestations of the disease (p < 0.01). In patients at an active stage with moderate and severe course of alopecia areata, the content of NO2 and cNOS was significantly lower than the level of indices at chronic disease. Correlation analysis revealed the existence of complex relationships between angiogenic factors, features of the disease course. Identified disorders can create conditions for the development of endothelial dysfunction and indicate a direct involvement of them into the mechanisms of formation of alopecia areata. Key words: alopecia areata, angiogenesis, endothelial dysfunction.
DIAGNOSTIC RADIOLOGY METHODS OF DEGENERATIVE CHANGES IN LUMBAR INTERVERTEBRAL DISCS IN YOUNG PEOPLE
Authors: Mammadov Ilhar Halyb ohly
Published: March 2020

In recent years, the number of scientific studies investigating the prevalence of low back pain among schoolchildren has been significantly increased. Degenerative disease of the discs is often accompanied by a low back pain with irradiation into the legs in representatives of different age groups, in particular, in older children. The main factors of its development are genetic predisposition, trauma, obesity, lack of exercise. Most of the components of the vertebral motor segment have the nerve endings and reflex influences, accompanied by inflammation, microcirculatory disorders, and their combination contributes to an appearance of back pain. Diagnosis of degenerative disc disease includes the study of the patient's medical history, analysis of clinical symptoms, use of functional tests and various types of imaging to clarify the degree of macrostructural changes in disks, among which the main place is taken by the magnetic resonance imaging. The development of degenerative changes in intervertebral discs as early as childhood, which requires a further study using non−invasive, accessible and informative methods, especially ultrasound ones. The results of ultrasonography of lumbar intervertebral discs were analyzed in 36 adolescents aged 16−18 years, diagnosed for the protrusion when the MRI was applied. Paramedian protrusion was found to be significantly more frequent than posterolateral, median, and circular ones. Due to its non−invasiveness, low price and information value, the ultrasound can be the most popular method not only as a screening one but also for the expert evaluation of lumbar intervertebral disc protrusion in schoolchildren.

Key words: diagnostic radiology, lumbar intervertebral discs, adolescents.