scholarly journals Numerical analysis of impact pressures on board during vessel movement in ice

2020 ◽  
Author(s):  
В.Г. Бугаев ◽  
В.В. Новиков ◽  
К.А. Молоков ◽  
Д.В. Славгородская
Keyword(s):  
Method Comparison ◽  
The Body ◽  
The Arctic ◽  
Design Stage ◽  
Shock Pulse ◽  
Good Convergence ◽  
The Many ◽  
Comparison Of The Results ◽  
The Impact ◽  
Contact Pressures

Вопросам прочности судов при эксплуатации во льдах в последнее время уделяется все больше внимания в связи возрастающим интересом к освоению Арктики. Несмотря на множество проведенных исследований, остаются не всегда ясными и трудно определимыми величина и характер ударных контактных давлений на корпус, что связано со сложным процессом соударения льда и корабля, зависящим от многочисленных факторов. В этой связи, важным является накопление и систематизация результатов исследований. В данной работе проведен расчетный анализ ударного воздействия льда на корпус ледокола, показано, как изменяются амплитуда, длительность и форма ударного импульса. Выполнена оценка напряжений, перемещений и деформаций, возникающих в процессе смятия и изгиба ледовой пластины, контактных давлений в зависимости от скорости соударения, массы, толщины и конфигурации льдины, а также от углов наклона борта к вертикали и ватерлинии к диаметральной плоскости. Исследование проведено при рассмотрении процесса удара на 3D-модели корпуса и аналитическим методом. Сравнение результатов анализа численного моделирования и аналитических расчетов показывают достаточно хорошую их сходимость. Картина взаимодействия корпуса судна со льдом, а также численные значения параметров (ударного импульса, состояния льда) свидетельствуют о пригодности нелинейного динамического исследования на этапе проектирования и инженерного анализа формы корпуса судна. Полученные данные о количественном влиянии рассмотренных параметров на интенсивность ударного давления могут быть учтены при разработке судовой поверхности ледокольных судов на начальной стадии проектирования, а также при составлении ледовых паспортов. Recently, more and more attention has been paid to the issues of ship durability during operation in ice due to the growing interest in the development of the Arctic. Despite the many studies performed, the magnitude and nature of impact contact pressures on the hull are not always clear and difficult to determine, which is associated with the complex process of collision of ice and the ship, depending on numerous factors. In this regard, the accumulation and systematization of research results is important. In this work, we performed a calculation analysis of the impact of ice on the icebreaker’s hull, showing how the amplitude, duration and shape of the shock pulse change. The stresses, displacements, and deformations arising during the crushing and bending of the ice plate, the contact pressures depending on the impact speed, mass, thickness and configuration of the ice floe, as well as on the angles of inclination of the bead to the vertical and the waterline to the diametrical plane, were estimated. The study was conducted when considering the impact process on a 3D model of the body and the analytical method. Comparison of the results of the analysis of numerical simulation and analytical calculations show a fairly good convergence. The picture of the interaction of the ship’s hull with ice, as well as the numerical values of the parameters (shock pulse, ice state) indicate the suitability of nonlinear dynamic research at the stage of design and engineering analysis of the shape of the ship’s hull. The obtained data on the quantitative influence of the considered parameters on the pressure intensity can be taken into account when developing the ship surface of icebreaking vessels at the initial design stage, as well as when compiling ice certificates.

Sea spray icing: The physical process, and review of prediction models and winterization techniques

2021 ◽  
pp. 1-26
Author(s):  
Sujay Deshpande ◽  
Ane Sæterdal ◽  
Per-Arne Sundsbø
Keyword(s):  
Prediction Models ◽  
Offshore Structures ◽  
Cold Climate ◽  
Working Environment ◽  
The Arctic ◽  
Design Stage ◽  
Sea Spray ◽  
Ice Accretion ◽  
Sea Wind ◽  
The Impact

Abstract Ice accretion on marine vessels and offshore structures is a severe hazard in the Polar Regions. There is increasing activities related to oil and gas exploration, tourism, cargo transport, and fishing in the Arctic. Ice accretion can cause vessel instability, excess load on marine structures and represents a safety risk for outdoor working environment and operations. Freezing sea spray is the main contributor to marine icing. For safe operations in cold climate, it is essential to have verified models for prediction of icing. Sea spray icing forecast models have improved. Empirical and theoretical models providing icing rates based may be useful as guidelines. For predicting the distribution of icing on a surface at the design stage, Computational Fluid Dynamics has to be applied along with a freezing module. State-of-the-art models for numerical simulation of sea spray icing are still not fully capable of modelling complex ship-sea-wind interactions with spray generation and impact of shipped water. Existing models include good understanding of spray flow effects and freezing. Further development should focus on developing models for dynamic ship-sea-wind interactions, in particular including spray generation, effects of shipped water and distribution of icing on the vessel surface. More experimental and full-scale data is needed for development and verification of new and improved models. Models that estimate ice distribution may improve the winterization design process and reduce effort required for de-icing. Improved methods for de-icing and anti-icing will reduce the impact of sea spray icing and increase safety for marine operations in cold waters.

Personality Factors as Determinants of the Stress Experienced By the Adolescents

2016 ◽  
Vol 4 (1) ◽  
Author(s):  
Jyotsna Singh ◽  
Dr. Fariha Ishrat Ullah
Keyword(s):  
Peer Interactions ◽  
Emotional Experience ◽  
The Body ◽  
Personality Factors ◽  
Specific Response ◽  
Type D ◽  
Physical Maturation ◽  
Type A Personality ◽  
The Many ◽  
The Impact

Adolescence is an age of opportunity for children, and a pivotal time for us to build on their development in the first decade of life, to help them navigate risks and vulnerabilities, and to set them on the path to fulfilling their potential. During adolescents there are high rates of drug abuse, suicides, social withdrawals, alcohol abuse or sudden angry outbursts. The present study aims at investigating the personality factors as determinants of the stress experienced by the adolescents.  Anything that poses threat to our wellbeing is a stress for us. Stress is experienced by everyone from time to time. Not all stress is bad, thus, there is both eustress and distress. According to Baum (1990), stress is any uncomfortable emotional experience accompanied by predictable biochemical, physiological and behavioral changes. Hans Selye defined stress as a non-specific response of the body to any demand for change. Adolescence has been considered, almost by definition, a period of heightened stress (Spear, 2000) due to the many changes experienced concomitantly, including physical maturation, drive for independence, increased salience of social and peer interactions, and brain development (Blakemore, 2008; Casey, Getz, & Galvan, 2008a; Casey, Jones, & Hare, 2008b). Although new-found independence can be stimulating it may also lead to feelings of being overwhelmed by change, which has historically led some researchers to characterize adolescence as ridden with ‘storm and stress’ (Hall, 1904). Thus, being pushed under the pressure of increased competition mostly in career opportunities, parent/ peer/ teacher’s pressure, there is lot of stress among adolescents and there is high need to focus on this issue amongst them. Many factors affect stress, personality is one major amongst them. Specific inherited characteristics, early experience in life, and particular, learned cognitive predispositions make individuals more or less susceptible to the effects of stressors.  Intensity of stress response are greatly dependable on age, gender, intelligence, and numerous characteristics of personality, such as hardiness, locus of control, self-efficacy, self-esteem, optimism, hostility (component of type A personality) and type D traits (negative affectivity and social inhibition). The increasing number of suicide rates indicates that there is stress among adolescents, so we can work on the personality traits which help in reduction of stress amongst adolescents such as resilience, hardiness etc. Thus, to understand the relation between personality and stress, it is essential to recognize the impact of individual differences on stress. Quantitative method is being used by the researcher. Appropriate data analysis will be done.

The power of spirituality

2018 ◽  
Vol 30 (4) ◽  
pp. 867-888 ◽  
Author(s):  
Muhammad Abid Saleem ◽  
Lynne Eagle ◽  
Asif Yaseen ◽  
David Low
Keyword(s):  
Negative Impact ◽  
Moderated Mediation ◽  
The Body ◽  
Mediation Model ◽  
Content Type ◽  
Moderated Mediation Model ◽  
Perceived Consumer Effectiveness ◽  
The Many ◽  
The Impact ◽  
Environmental Behaviours

Purpose In the wake of growing environmental issues, active public and corporate interventions are inevitable to reduce the negative impact of human activities on global environments. Building on the Norm Activation Model and Value-Belief-Norm Theory, the purpose of this paper is to report on research exploring consumers’ eco-socially conscious behaviours related to the choice and use of personal cars in a developing country, Pakistan. Design/methodology/approach To test a moderated-mediation model of environmental values, perceived consumer effectiveness (PCE), spirituality and eco-socially conscious consumer behaviours (ESCCBs), data were collected from 447 customers of three automobile manufacturing firms from eight different cities of Pakistan. The data collection was undertaken by using a self-administered questionnaire based on key themes in the literature. Findings Analysis of the data revealed that altruistic and egoistic values were negatively while biospheric values were positively associated with eco-ESCCB. PCE mediated all the relationships and spirituality moderated the mediated paths. Originality/value Although there are several models that explain purchase and use of personal cars in isolation or in conjunction with other general pro-environmental behaviours, an explanation of the eco-social aspects of purchase and use of personal cars in one theoretical model is rare to find. Second, among the many theoretical predictors and intervening factors explaining several pro-environmental behaviours, some culture-specific factors have been ignored – spirituality being one of them. This study contributes to the body of knowledge related to pro-environmental behaviours by conceptualising and testing the impact of spirituality in a moderated-mediation model.

scholarly journals LANDSCAPE THERAPY FOR DISORDERS OF VISUAL PERCEPTION IN THE FAR NORTH

2021 ◽  
Vol 7 (1) ◽  
pp. 7-19
Author(s):  
V. K. Zhirov ◽  
Yu. N. Zakrevsky ◽  
O. B. Gontar ◽  
V. V. Megorsky ◽  
A. A. Koygerova ◽  
...  
Keyword(s):  
Visual Perception ◽  
Good Health ◽  
The Body ◽  
The Arctic ◽  
Prolonged Stay ◽  
Far North ◽  
Dimensional Classification ◽  
Military Facilities ◽  
The Impact

The development of the Russian Arctic continental shelf with the production of large volumes of oil products, the continuation of the functioning of the well-known mining enterprises of the Kola North for the extraction of rare earth and non-ferrous metals necessary for the country’s industry, the basing of the Northern Fleet as the most important component of the country’s defense capability require good health of all categories of workers and military personnel of the continental zone and the Arctic islands in the Far North. Psychoneurological diseases, including those associated with disorders of visual perception, developing on the basis of the «polar tension syndrome», acquire special significance in these conditions. Based on the results of generalization of the views existing in the scientific literature on the integrity of the mechanisms of visual perception, a two-dimensional classification of various forms of its variability has been developed, which can be used as a methodological basis for the construction of virtual and physical medical landscapes in recreational areas of military facilities, departmental sanatoriums and rest homes for prophylaxis and treatment of neuropsychiatric disorders caused by functional disorders of the body due to the impact of «polar load» and prolonged stay in closed technological spaces.

Representing utility and deploying the body

2020 ◽  
Vol 43 ◽  
Author(s):  
David Spurrett
Keyword(s):  
Functional Activity ◽  
Degrees Of Freedom ◽  
The Body ◽  
Target Article ◽  
Processing Demands ◽  
The Many

Abstract Comprehensive accounts of resource-rational attempts to maximise utility shouldn't ignore the demands of constructing utility representations. This can be onerous when, as in humans, there are many rewarding modalities. Another thing best not ignored is the processing demands of making functional activity out of the many degrees of freedom of a body. The target article is almost silent on both.

Hydrogen Cyanide Polymers from the Impact of Comet P/Shoemaker-Levy 9 on Jupiter

1997 ◽  
Vol 161 ◽  
pp. 179-187
Author(s):  
Clifford N. Matthews ◽  
Rose A. Pesce-Rodriguez ◽  
Shirley A. Liebman
Keyword(s):  
Amino Acids ◽  
Solar System ◽  
Hydrogen Cyanide ◽  
Nitrogen Heterocycles ◽  
Laboratory Studies ◽  
Heterogeneous Solids ◽  
The Many ◽  
Comet Halley ◽  
The Impact ◽  
By Products

AbstractHydrogen cyanide polymers – heterogeneous solids ranging in color from yellow to orange to brown to black – may be among the organic macromolecules most readily formed within the Solar System. The non-volatile black crust of comet Halley, for example, as well as the extensive orangebrown streaks in the atmosphere of Jupiter, might consist largely of such polymers synthesized from HCN formed by photolysis of methane and ammonia, the color observed depending on the concentration of HCN involved. Laboratory studies of these ubiquitous compounds point to the presence of polyamidine structures synthesized directly from hydrogen cyanide. These would be converted by water to polypeptides which can be further hydrolyzed to α-amino acids. Black polymers and multimers with conjugated ladder structures derived from HCN could also be formed and might well be the source of the many nitrogen heterocycles, adenine included, observed after pyrolysis. The dark brown color arising from the impacts of comet P/Shoemaker-Levy 9 on Jupiter might therefore be mainly caused by the presence of HCN polymers, whether originally present, deposited by the impactor or synthesized directly from HCN. Spectroscopic detection of these predicted macromolecules and their hydrolytic and pyrolytic by-products would strengthen significantly the hypothesis that cyanide polymerization is a preferred pathway for prebiotic and extraterrestrial chemistry.

Consideration of Geopolitical Challenges within the Analysis of Geoenvironmental Risks for Oil and Gas Development of the Russian Arctic

2019 ◽  
Vol 16 (6) ◽  
pp. 50-59
Author(s):  
O. P. Trubitsina ◽  
V. N. Bashkin
Keyword(s):  
Oil And Gas ◽  
Oil And Gas Industry ◽  
Optimal Operation ◽  
The Arctic ◽  
Stage Model ◽  
Oil And Gas Development ◽  
Gas Industry ◽  
The Impact ◽  
Further Development ◽  
Geopolitical Risks

The article is devoted to the consideration of geopolitical challenges for the analysis of geoenvironmental risks (GERs) in the hydrocarbon development of the Arctic territory. Geopolitical risks (GPRs), like GERs, can be transformed into opposite external environment factors of oil and gas industry facilities in the form of additional opportunities or threats, which the authors identify in detail for each type of risk. This is necessary for further development of methodological base of expert methods for GER management in the context of the implementational proposed two-stage model of the GER analysis taking to account GPR for the improvement of effectiveness making decisions to ensure optimal operation of the facility oil and gas industry and minimize the impact on the environment in the geopolitical conditions of the Arctic.The authors declare no conflict of interest

The Impact of Shariah Governance and Corporate Governance on the Risk Management Practices: Evidence from Local and Foreign Islamic Banks in Malaysia

2018 ◽  
Vol 15 (2) ◽  
pp. 1-20
Author(s):  
Sabri Embi ◽  
Zurina Shafii
Keyword(s):  
Risk Management ◽  
Corporate Governance ◽  
Management Practices ◽  
Principal Component ◽  
T Test ◽  
The Body ◽  
Primary Data ◽  
Islamic Banks ◽  
Shariah Governance ◽  
The Impact

The purpose of this study is to examine the impact of Shariah governance and corporate governance (CG) on the risk management practices (RMPs) of local Islamic banks and foreign Islamic banks operating in Malaysia. The Shariah governance comprises the Shariah review (SR) and Shariah audit (SA) variables. The study also evaluates the level of RMPs, CG, SR, and SA between these two type of banks. With the aid of SPSS version 20, the items for RMPs, CG, SR, and SA were subjected to principal component analysis (PCA). From the PCA, one component or factor was extracted each for the CG, SR, and RMPs while another two factors were extracted for the SA. Primary data was collected using a self-administered survey questionnaire. The questionnaire covers four aspects ; CG, SR, SA, and RMPs. The data received from the 300 usable questionnaires were subjected to correlation and regression analyses as well as an independent t-test. The result of correlation analysis shows that all the four variables have large positive correlations with each other indicating a strong and significant relationship between them. From the regression analysis undertaken, CG, SR, and SA together explained 52.3 percent of the RMPs and CG emerged as the most influential variable that impacts the RMPs. The independent t-test carried out shows that there were significant differences in the CG and SA between the local and foreign Islamic banks. However, there were no significant differences between the two types of the bank in relation to SR and RMPs. The study has contributed to the body of knowledge and is beneficial to academicians, industry players, regulators, and other stakeholders.

The impact of cultural factors on attachment dynamics: a view from Irish society

2019 ◽  
Vol 13 (2) ◽  
pp. 207-223
Author(s):  
Michael O’Toole
Keyword(s):  
Significant Role ◽  
Emotional Development ◽  
Cultural Factors ◽  
Seamus Heaney ◽  
Irish Society ◽  
Irish Context ◽  
Key Points ◽  
The Many ◽  
The Impact ◽  
The Relationship

In this article I examine aspects of the relationship between mothers and sons from an attachment perspective in an Irish context. Through the works of Irish writers such as Seamus Heaney, John McGahern, and Colm Tóibín, I focus on particular aspects of this relationship, which fails to support the developmental processes of separation and individuation in the many men who come to me for psychotherapy. I illustrate key points concerning this attachment dynamic through the use of clinical examples of my work with two men from my practice. While acknowledging that many other cultural factors play a significant role in the emotional development of children, integrating the work of our poets, novelists, and scholars with an attachment perspective

Influence of DAFS-25+polizon composition on blood and functional state of liver of steers at fattening

2020 ◽  
pp. 15-18
Author(s):  
Inna R. Kilmetova ◽  
◽  
Igor A. Rodin ◽  
Nazira I. Khayrullina ◽  
Nikolay G. Fenchenko ◽  
...  
Keyword(s):  
Functional State ◽  
White Blood Cells ◽  
Live Weight ◽  
The Body ◽  
Farm Animals ◽  
Control Group ◽  
Standard Diet ◽  
The Impact ◽  
Experimental Group ◽  
Stimulation Of

Summary. The disbalanced feeding and the uneven distribution of micro- and macroelements in the environment leads to a trace element, in particular hypomelanosis. To accelerate the growth and preservation of young farm animals include in the diet of various biological additives and drugs, which include selenium. For stimulation of weight gain in the livestock industry, as well as for the prevention and treatment of pathological processes in addition to micro - and macrouse amino acids, primarily methionine. The aim of this work was to study the influence of composition of DAFS-25+Polizon on morpho-biochemical parameters of blood and functional state of the liver in fattening bulls of black-motley breed in the conditions of the Republic of Bashkortostan. Experiments using were conducted on bull-calves of black-motley breed of the properties in the properties age from 6 to 15 months. The first experimental group during the experiment was additionally given the composition of DAFS-25+Polizon at a dose of 2 mg/kg, the animals of the control group received a standard diet. To assess the impact of the composition DAFS-25+Polizon on metabolism cattle studied morphological and biochemical indicators of blood and conducted histological examination of the liver. It is established that the use of the composition of DAFS-25+Polizon at a dose of 2 mg/kg increases the number of erythrocytes and hemoglobin in the experimental group and reduces the amount of white blood cells. The serum content of total protein, phosphorus and calcium increases in the group of experimental animals. Microscopic examination of the liver revealed no changes in the structure of the organ and hepatocytes in the experimental group, whereas in the control group hemodynamic disorders and dystrophic changes in liver cells were observed. Thus, the use of the composition DAFS-25+Polizon at a dose of 2 mg/kg of live weight in fattening bulls black-and-white breed contributes to the increase of redox processes in the body, stimulation of metabolism, prevent the development of liver disorders of cellular mechanisms of metabolism, optimizes the structure of the liver, which generally provides higher productivity.

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