scholarly journals Modeling of the impact of a shock wave on port infrastructure facilities

2021 ◽  
pp. 146-152
Author(s):  
А.В. Фадеев
Keyword(s):  
Shock Wave ◽  
Particle Method ◽  
Point Explosion ◽  
Potential Risks ◽  
Three Stages ◽  
A Charge ◽  
Port Infrastructure ◽  
The Impact ◽  
The Mathematical Model

Факты возникновения аварийных и катастрофических состояний портовой инфраструктуры при погрузке (выгрузке) взрывчатых веществ свидетельствуют о наличии проблемы связанной с построением системы обеспечения безопасности при грузовых операциях и мест их складирования. Неправильно выбранные: место, техническое сопровождение и организация погрузки взрывчатых веществ, в определенных условиях становятся причинами возникновения катастрофических ситуаций разного уровня опасности. При моделировании ситуаций рассматривается использование метода крупных частиц и теории точечного взрыва при воздействии ударной волны на объекты портовой инфраструктуры. Математическая модель метода заключается в разделении по физическим процессам исходной нестационарной системы уравнений Эйлера, записанной в форме законов сохранения. Процесс вычислений состоит из многократных итераций, каждая из которых содержит три этапа. Основанием для разработки программы является необходимость компьютерного моделирования процесса возникновения и развития ударной волны в условиях сложного рельефа местности, вызванной подрывом заряда конденсированного взрывчатого вещества. Автор считает, что такой подход существенно улучшит скорость и качество оценки безопасности выбранной системы погрузки (выгрузки) взрывоопасных и взрывчатых веществ, потенциальных рисков возникновения различных катастрофических состояний, и прогноза сценария их развития. The facts of the occurrence of emergency and catastrophic conditions of the port infrastructure during the loading (unloading) of explosives indicate the existence of a problem associated with the construction of a security system for cargo operations and their storage locations. Incorrectly chosen: location, technical support and organization of loading of explosives, under certain conditions, become the causes of catastrophic situations of different levels of danger. When modeling situations, the use of the large particle method and the theory of a point explosion under the impact of a shock wave on port infrastructure facilities is considered. The mathematical model of the method consists in the separation by physical processes of the initial non-stationary system of Euler equations, written in the form of conservation laws. The calculation process consists of multiple iterations, each of which contains three stages. The basis for the development of the program is the need for computer modeling of the process of the occurrence and development of a shock wave in a complex terrain caused by the detonation of a charge of a condensed explosive. The author believes that such an approach will significantly improve the speed and quality of the safety assessment of the selected system of loading (unloading) of explosive and explosive substances, the potential risks of various catastrophic conditions, and the forecast of their development scenario.

Impact of Further Impoundments on the Oxygen Balance and Water Quality of the Danube in Germany

1990 ◽  
Vol 22 (5) ◽  
pp. 69-78 ◽  
Author(s):  
D. Müller ◽  
V. Kirchesch
Keyword(s):  
Water Quality ◽  
Quality Parameters ◽  
Nitrifying Bacteria ◽  
Oxygen Balance ◽  
Quality Model ◽  
Model Calculations ◽  
River Bed ◽  
The Impact ◽  
The Mathematical Model

The construction of two or three impounding dams in the remaining freely flowing reach (73 km) of the Danube is under discussion. The purpose of these impoundments is to guarantee a minimum navigable depth of 3 m needed for modern cargo ships and to produce electric power. The impact of these developments is discussed on the basis of experience with similar impoundments further upstream and of the results from water quality model calculations. The mathematical model used is of the deterministic type, calculating the growth of slowly-growing organisms (nitrifying bacteria, algae and zooplanktons) according to MONOD and MICHAELIS-MENTEN. Compared with impoundments on other German rivers or the Iron Gate impoundments on the Danube, the effect of the impoundments under discussion on water quality parameters is likely to be fairly small, reflecting the slight changes in morphology which would be necessary for attaining the water depth required. Therefore, the more important effects of these developments would be the changes in the ecologic situation at the river bed and near the banks of the river.

scholarly journals Efecto crítico de la pandemia por covid-19 en el empleo de México

2021 ◽  
Vol 0 (128) ◽  
pp. 27-58
Author(s):  
Fidel Olivera ◽  
◽  
Guillermo Olivera ◽  
Keyword(s):  
Metropolitan Areas ◽  
Formal Employment ◽  
History Of ◽  
Monthly Changes ◽  
Three Stages ◽  
Using Data ◽  
State Size ◽  
The Impact ◽  
Social Security Institute

The cycle of formal employment during 2020, following the Covid-19 pandemic, is analyzed in three stages: paralysis with destruction, interrupted recovery, and relapse. Likewise, using data from the Mexican Social Security Institute on monthly changes to the numbers of insured workers, it was possible to identify the impact of govern-ment management, and trace the history of infection provoked by the disease, in lost or gained employment at each stage. Changes to the numbers of those in employment are illustrated by the economic sector, state, size of economic unit, salary range, sex and age group of the workers. The highest rate of unemployment was in tourism and recre-ational services, the most populous states with dense metropolitan areas, medium and large economic units, among young workers, the very young and those over 60 years old, and those with the worst wages. It is estimated that it will take at least until 2022 for the quality of work to recover and the accumulated deficit to be restored

Experimental Study of the Impact of a Strong Underwater Shock Wave on a Concrete Dam

2012 ◽  
Vol 152-154 ◽  
pp. 1063-1070 ◽  
Author(s):  
Lu Lu ◽  
Li Xin ◽  
Zhou Jing
Keyword(s):  
Shock Wave ◽  
Upstream Face ◽  
Downstream Face ◽  
Underwater Shock Wave ◽  
Concrete Dam ◽  
Acceleration Sensors ◽  
Input Pressure ◽  
Underwater Shock ◽  
The Impact

To study the effect of a strong underwater shock wave on a concrete dam, in this research the hammers impact were applied to simulate the underwater shock in a model test. The model scale was 200 according to the gravity-elasticity similitude law. Five acceleration sensors were imbedded along the downstream surface of the dam. The maximum input pressure was evaluated based on the recorded accelerations. The explosive charge and the distance between the explosion center and the dam were determined corresponding to the maximum impact pressure. After the hammers impacted, the upstream face of the dam was fractured and downstream was scabbed; some cracks extended from the upstream face to the downstream face; the head of dam was projected; and the dam appeared entirely displacement. Although the damage similarity of the model and prototype is not verified, this method may be used to verify the quality of a protection project and offered evidence to define a protection project.

scholarly journals The impact of mediterranean diet in perioperative nurses’ health

2020 ◽  
Vol 6 (1) ◽  
pp. 21
Author(s):  
Sofia Agriopoulou ◽  
Ioannis Koutelekos
Keyword(s):  
Mediterranean Diet ◽  
Eating Habits ◽  
Working Hours ◽  
Long Working Hours ◽  
Perioperative Nurses ◽  
Stressful Environment ◽  
Quality Life ◽  
Potential Risks ◽  
The Impact

Perioperative nurses are involved in the care of surgery patients, in a highly stressful environment with various risks. Unrealistic schedules and long working hours standing, and working shifts, make them more vulnerable to potential risks. Their health is affected by the quality of the work environment. Problems that may arise from the highly stressful work involve chronic stress, burnout, dissatisfaction, obesity and sleeping disorders. Nutritional problems result from the lack of time between shifts for food preparation, the extended time without food or liquid, reduced hydration, the irregular hours and times to eat, the less substantial meals and more caloric snacks. Mediterranean diet is a scientifically proven healthy diet, indicated for fighting obesity, heart disease and cancer. The consumption of fruit, vegetables, grains, nuts, and olive oil in the framework of Mediterranean diet which is rich in beneficial nutrients, could significantly improve perioperative nurses’ quality life, and their eating habits.

scholarly journals Application of Risk Management Quality Integrated And Impact on the Quality Students Improvement MAN 2 Medan Model

2021 ◽  
pp. 38-48
Author(s):  
Nur Azizah
Keyword(s):  
Quality Management ◽  
Total Quality Management ◽  
Theory Of Knowledge ◽  
Total Quality ◽  
Management Quality ◽  
Three Stages ◽  
Customer Services ◽  
Implementation Problems ◽  
The Impact

Implementation of Total Quality Management of in school has a purpose main give satisfaction to the customer services of education either internal or external to the results of product quality . Implementation of Total Quality Management in schools requires at least three stages of implementation , namely : preparation , planning , and implementation . Problems are contained in the study times this include How the implementation of management quality integrated in Man 2 Model Terrain , How is the impact of the implementation of management quality integrated in the improvement of the quality of the participants didikdi Man 2 Model Medan method of research that is done is to use approach qualitative with technique of collection of data such as observation , interview and documentation . The results of his research is the management quality integrated merupaka a theory of knowledge management who directs the leadership of the organization and its personnel to carry out repairs quality constantly are focused on achieving the satisfaction of customers internal and customers externally. Implementation of the management quality integrated in MAN 2 Model Terrain increasingly in improved based on the needs of customers in order to graduate from madrash that can fulfill the wishes and expectations of the community . The impact of the implementation of management quality terpdusejauh it can be seen from the attitude , behavior behavior , and ways of view of students and residents madrsah lainny to continue melakukn repair and can compete dier digital now this. Constraints that expressed by the head of the madrassa in the improvement of the quality of the participant students in the form of time which is in charge sometimes not in accordance with the conditions and expectations

scholarly journals Research of brick dynamic strength when subjected to shock loading by method of computer modelling

2019 ◽  
Vol 221 ◽  
pp. 01041
Author(s):  
Andrei Plyaskin ◽  
Nikolai Belov ◽  
Nikolai Yugov ◽  
Artem Ryshkov ◽  
Aleksei Yugov ◽  
...  
Keyword(s):  
Mathematical Model ◽  
Shock Wave ◽  
Shock Loading ◽  
Computer Modelling ◽  
Dynamic Strength ◽  
Drop Weight ◽  
The Impact ◽  
The Mathematical Model

The study represents the mathematical model of distorting and destruction of ordinary brick and masonry when subjected to shock-wave loadings. The research of the impact dynamic strength of the masonry's two fragments to the steel drop-weight of 1-2 m, weighing 197-1000 kg, was conducted by using the method of the computer modelling.

scholarly journals Risk committee, corporate risk-taking and firm value

2020 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Md. Borhan Uddin Bhuiyan ◽  
Muhammad A. Cheema ◽  
Yimei Man
Keyword(s):  
Risk Taking ◽  
Firm Value ◽  
Firm Risk ◽  
Content Type ◽  
Potential Risks ◽  
Risk Committee ◽  
Corporate Risk ◽  
The Impact ◽  
Practical Implications

PurposeThe authors empirically examine the impact of the stand-alone risk committee on corporate risk-taking and firm value.Design/methodology/approachThe authors argue that the existence of a stand-alone risk committee enhances the quality of corporate governance, which reduces corporate risk-taking and strengthens the firm value that might improve investor protection.FindingsThe authors find corporate risk-taking decline significantly for firms that have a stand-alone risk committee compared with firms that have a joint audit and risk committee. The authors also find that the presence of a stand-alone risk committee is positively associated with firm value.Practical implicationsThe evidence is consistent with the proposition that firms with a stand-alone risk committee can effectively evaluate potential risks and implement a proper risk management system.Originality/valueThis is the first paper that investigates the association between the existence of a stand-alone risk committee and firm risk-taking in a multi-industry setting. Also, our research extends the association between a stand-alone risk committee and firm value.

scholarly journals The Application of Shock Wave in the Therapy of Patients with Calcaneal Spur

2019 ◽  
Vol 61 (4) ◽  
pp. 252-256
Author(s):  
Agnieszka Dakowicz ◽  
Bogumiła Wasilczuk ◽  
Agnieszka Bajko ◽  
Diana Moskal-Jasińska ◽  
Anna Kuryliszyn-Moskal
Keyword(s):  
Quality Of Life ◽  
Shock Wave ◽  
Shock Wave Therapy ◽  
Calcaneal Spur ◽  
Pain Disability ◽  
Foot Function Index ◽  
Function Index ◽  
Foot Function ◽  
The Impact

Introduction: Calcaneal spur is a common condition associated with pain in the foot area. The disease enables proper foot load which leads to pain in other areas of the osteoarticular system. Among the proposed methods of conservative treatment, shock wave therapy is applied. Aim: The aim of the study was to assess the clinical effectiveness of focussed shock wave therapy in patients with calcaneal spur. What is more, the impact of therapy on patients quality of life has been assessed. Material and Methods: The study included 25subjects treated in outpatient conditions at the Department of Rehabilitation, University Hospital in Bialystok. To perform the procedures, a PiezoWave² byRichard Wolf Elevation Medical has been used. Patients underwent four shock wave procedures. Clinical assessment based on the physical and subjective examination has been conducted before and after the treatment. Pain has been assessed according to the VAS, Laitinen scale and the Foot Function Index has been used in order to measure pain, disability, activity limitation as well as Role and Maudsley scores. Results: After the application of shock wave procedures, pain relief assessed by VAS and Laitinenscale has been observed. Analysis of the effectiveness of therapy with Foot Function Index and the Role and Maudsley scale revealed significant improvements in examined subscales (pain, disability and limited activity). Conclusions: Focussed shock wave therapy reduces pain in patients with calcaneal spur. The proposed treatment improves the functional status of patients, contributing to the enhancement of their quality of life.

Public procurement quality assessment of a region: regression analysis

2020 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Olga S. Belokrylova ◽  
Kirill A. Belokrylov ◽  
Sergey S. Tsygankov ◽  
Vadim A. Syropyatov ◽  
Elena D. Streltsova
Keyword(s):  
Mathematical Model ◽  
Regression Analysis ◽  
Public Procurement ◽  
Mathematical Apparatus ◽  
Content Type ◽  
Correlation And Regression Analysis ◽  
The Impact ◽  
The Mathematical Model ◽  
Functional Attribute

PurposeThe paper aims to present the results of a study aimed at constructing economic and mathematical models used in decision-making in the management of budget procurement of a region, contributing to the efficient use of budget funds. One of the key problems in this area is the assessment of the quality of procurementDesign/methodology/approachOne of the key problems in this area is the assessment of the quality of procurement, the solution of which requires the application of economic and mathematical methods, models, tools and algorithms built into information systems for supporting decision-making. The introduction of these systems brings to a qualitatively new level the system of relations between subjects of budget procurement. The paper analyzes modern publications on the implementation of public procurement and related issues of efficiency (savings) of budgetary funds.FindingsThe indicators on the basis of which the evaluation of the quality of regional procurement is determined are proposed. The architecture of the information system for decision support in the evaluation of procurement quality has been developed. The system has the property of adapting to changes in the state of the environment through the constant accumulation of statistical data characterizing the procurement and adjustment of the parameters of the mathematical model in accordance with them. A mathematical model is built into the control loop that allows ranking the indicators of budget purchases by the degree of their influence on the effective attribute. The role of a functional feature is the quality of budget procurement. The mathematical model is based on the application of the mathematical apparatus of correlation and regression analysis. The impact of each of the factor attributes on the functional attribute has been assessed.Originality/valueThe mathematical model is based on the application of the mathematical apparatus of correlation and regression analysis. The impact of each of the factor attributes on the functional attribute has been assessed. Real statistics are given that characterize budget procurements carried out in retrospect. The coefficients of the linear regression model are determined based on the use of the STATISTICA application software package. The proposed decision support information system with a regression model built into it allows one to make scientifically and quantitatively sound decisions when assessing the quality of budget purchases of a region.

scholarly journals The Impact of Port Transport-logistics Infrastructure and LPI for Economic Growth

Pomorstvo ◽  
2019 ◽  
Vol 33 (1) ◽  
pp. 63-75 ◽  
Author(s):  
Madina Duzbaievna Sharapiyeva ◽  
Alfonz Antoni ◽  
Raikul Yessenzhigitova
Keyword(s):  
Economic Growth ◽  
Economic Impact ◽  
Structural Equation ◽  
International Agreements ◽  
Equation Model ◽  
High Quality ◽  
Port Infrastructure ◽  
The Impact ◽  
Transport Logistics

For this study, carried out as an empirical study, 37 landlocked countries have been selected. And a broader economic impact on the national economy, on the quality of the port infrastructure and logistics efficiency has been considered as well as investments on creating a high quality port infrastructure and its contribution to the economy, often questioned by politicians, investors and general public. The Structural Equation Model (SEM) has been used for providing empirical data about a significant economic impact on the port infrastructure quality and logistics efficiency. However, some countries that do not have access to the sea are not, according to international agreements, inferior to other countries in terms of economic growth.

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