scholarly journals AN EXPERIMENTAL STUDY OF EXTREME WAVE KINEMATICS ON OPPOSING DEPTH-VARYING CURRENTS

2018 ◽  
pp. 37
Author(s):  
Xuyang Niu ◽  
Yuxiang Ma ◽  
Xiaozhou Ma ◽  
Guohai Dong ◽  
Yongbo Song
Keyword(s):  
Experimental Studies ◽  
Oceanic Circulation ◽  
Extreme Waves ◽  
Extreme Wave ◽  
Wind Force ◽  
Wave Kinematics ◽  
The Past ◽  
Key Factor ◽  
Generation Mechanisms ◽  
The Waves

In the past decades, there are numerous reports on the accidents caused by extremely large waves. A large number of papers have contributed to the study on the physical properties and the generation mechanisms of such large waves. However, most of the research has been carried out without presence of currents. In the real ocean, the waves most likely coexist with currents. In many circumstances, owing to wind force and oceanic circulation, the currents are commonly not uniform and vary with depth, which plays an important role in the evolution of gravity waves (Swan et al., 2001). Wave kinematics is a key factor in designing structures. However, experimental studies of the influence of depth-varying currents on extreme waves are mainly considered for the changing of spatial and temporal geometric characteristics (Yao and Wu, 2006). In the present study, the kinematics of extreme waves on opposing depth-varying currents will be investigated using the PIV technology.

scholarly journals EXTREME WAVE PRESSURES AND LOADS ON A PILE-SUPPORTED WHARF DECK - INFLUENCES OF AIR GAP AND WAVE DIRECTION

2018 ◽  
pp. 5
Author(s):  
Andrew Cornett
Keyword(s):  
Offshore Structures ◽  
Model Tests ◽  
Scale Model ◽  
Extreme Waves ◽  
Wave Direction ◽  
Coastal Structures ◽  
Extreme Wave ◽  
Wave Impact ◽  
The Past ◽  
Water Depths

Many deck-on-pile structures are located in shallow water depths at elevations low enough to be inundated by large waves during intense storms or tsunami. Many researchers have studied wave-in-deck loads over the past decade using a variety of theoretical, experimental, and numerical methods. Wave-in-deck loads on various pile supported coastal structures such as jetties, piers, wharves and bridges have been studied by Tirindelli et al. (2003), Cuomo et al. (2007, 2009), Murali et al. (2009), and Meng et al. (2010). All these authors analyzed data from scale model tests to investigate the pressures and loads on beam and deck elements subject to wave impact under various conditions. Wavein- deck loads on fixed offshore structures have been studied by Murray et al. (1997), Finnigan et al. (1997), Bea et al. (1999, 2001), Baarholm et al. (2004, 2009), and Raaij et al. (2007). These authors have studied both simplified and realistic deck structures using a mixture of theoretical analysis and model tests. Other researchers, including Kendon et al. (2010), Schellin et al. (2009), Lande et al. (2011) and Wemmenhove et al. (2011) have demonstrated that various CFD methods can be used to simulate the interaction of extreme waves with both simple and more realistic deck structures, and predict wave-in-deck pressures and loads.

Numerical Simulation of Wave in Deck Loading on Offshore Structures

2014 ◽  
Author(s):  
Yu Chen ◽  
Yanling Wu ◽  
Graham Stewart ◽  
Johan Gullman-Strand ◽  
Xin Lu
Keyword(s):  
Free Surface ◽  
Research Programme ◽  
Offshore Structures ◽  
Navier Stokes ◽  
Impact Loads ◽  
Extreme Waves ◽  
Extreme Wave ◽  
Existing Structures ◽  
The Impact ◽  
The Waves

Extreme wave impacts on the decks of offshore structures with insufficient air gap may cause damage or even collapse with safety, economic, and pollution consequences. In this study, the impact loads on a fixed platform deck have been predicted numerically by employing a Navier-Stokes solver with the free-surface captured by the volume of fluid (VOF) method. 3D numerical simulations of wave-deck interactions for long-crested extreme waves were performed. The simulations successfully captured the evolution of impact loads and free surface of the waves during the interaction with the platform deck. A detailed parametric analysis of wave-deck interactions showed significant differences in loads under various situations and confirmed the large magnitudes of the loads to be expected during impact. The results presented include a solid box and a more realistic case of under-deck beams. These provide a useful benchmark for predicting wave loadings on platform decks and through this research programme the longer term aim is to establish improved guidelines for assessing the risk of existing structures.

Bi19S27I3 nanorods: a new candidate for photothermal therapy in the first and second biological near-infrared windows

Nanoscale ◽  
2021 ◽  
Author(s):  
Jinsong Xiong ◽  
Qinghuan Bian ◽  
Shuijin Lei ◽  
Yatian Deng ◽  
Kehan Zhao ◽  
...  
Keyword(s):  
Cancer Therapy ◽  
Photothermal Therapy ◽  
Near Infrared ◽  
Research Interest ◽  
The Past ◽  
Nir Light ◽  
Considerable Research ◽  
Key Factor

Near-infrared (NIR) light induced photothermal cancer therapy using nanomaterials as photothermal agents has attracted considerable research interest over the past few years. As the key factor in the photothermal therapy...

MODERN PERFORMANCE ON THE KAZAKH KOBYZ

2020 ◽  
Vol 1 (2) ◽  
pp. 176-180
Author(s):  
T. Zh. Yeginbayeva ◽  
Keyword(s):  
Cultural Development ◽  
Ancient History ◽  
Musical Culture ◽  
The Past ◽  
Ensemble Performance ◽  
Natural Tendency ◽  
New Development ◽  
Key Factor ◽  
History Of ◽  
Ancient Times

Global processes in the musical culture of Kazakhstan are the result of the numerous events that have taken place in the country over the past 20 years. The independence of the state has become a key factor that has had a decisive impact on the economic, socio-political and cultural development of the country. We have entered a new life, which has a rich cultural heritage and was carefully preserved by our ancestors. One of the proofs is the history of Kazakh kobyz art from ancient times to the present day. Modern kobyz art is closely connected with ancient history and has a rich natural tendency for new development, based on centuries of experience. Therefore, kobyz music of the XXth–XXIst centuries absorbed the traditions of European genres and styles, and is widely used in mass music, in various directions of ethnorock, art-rock, folk and others. Two lines of development of music for kobyz and music on kobyz existed in ancient times and nowadays. From here comes the divergence of creative direction among modern composers and in ensemble performance.

Biography and Autobiography

2021 ◽  
pp. 211-224
Author(s):  
Laura Marcus
Keyword(s):  
Life Writing ◽  
Crucial Aspect ◽  
Reading And Writing ◽  
To The Lighthouse ◽  
Victorian Era ◽  
The Past ◽  
Cultural Milieu ◽  
The Waves ◽  
Jacob's Room

This chapter explores the centrality of biography and autobiography to Woolf’s reading and writing life, and to her cultural milieu, in which experiments in life-writing were a crucial aspect of the modernist reaction against the Victorian era. It examines Woolf’s deep engagement in her fiction with life-writing forms, from the bildungsroman of The Voyage Out to the play with conventional biographical forms of Jacob’s Room, Orlando, The Waves, and Flush and the autobiographical foundations of To the Lighthouse. It also examines her biography of Roger Fry, and her own experiment in memoir-writing, the posthumously published ‘A Sketch of the Past’, in the context of concerns with the nature of memory, identity, and sexuality.

Arsenic Dispensing Powder Promotes Erythropoiesis in Myelodysplastic Syndromes via Downregulation of HIF1A and Upregulation of GATA Factors

2021 ◽  
pp. 1-25
Author(s):  
Teng Fan ◽  
Xiaomin Feng ◽  
Asumi Yokota ◽  
Weiyi Liu ◽  
Yuting Tang ◽  
...  
Keyword(s):  
Myelodysplastic Syndromes ◽  
Experimental Studies ◽  
Mice Model ◽  
Medical Sciences ◽  
Gata Factors ◽  
The Past ◽  
Drug Mechanism ◽  
China Academy ◽  
Significant Efficacy ◽  
Xiyuan Hospital

Traditional Chinese Medicine (TCM) is a practical medicine based on thousands of years of medical practice in China. Arsenic dispensing powder (ADP) has been used as a treatment for MDS patients with a superior efficacy on anemia at Xiyuan Hospital of China Academy of Chinese Medical Sciences. In this study, we retrospectively analyzed MDS patients that received ADP treatment in the past 9 years and confirmed that ADP improves patients’ anemia and prolongs overall survival in intermediate-risk MDS patients. Then, we used the MDS transgenic mice model and cell line to explore the drug mechanism. In normal and MDS cells, ADP does not show cellular toxicity but promotes differentiation. In mouse MDS models, we observed that ADP showed significant efficacy on promoting erythropoiesis. In the BFU-E and CFU-E assays, ADP could promote erythropoiesis not only in normal clones but also in MDS clones. Mechanistically, we found that ADP could downregulate HIF1A in MDS clones through upregulation of VHL, P53 and MDM2, which is involved in two parallel pathways to downregulate HIF1A. We also confirmed that ADP upregulates GATA factors in normal clones. Thus, our clinical and experimental studies indicate that ADP is a promising drug to promote erythropoiesis in both MDS and normal clones with a superior outcome than current regular therapies. ADP promotes erythropoiesis in myelodysplastic syndromes via downregulation of HIF1A and upregulation of GATA factors.

Material Behavior of 2D Steel Lattices with Different Unit-Cell Patterns

2021 ◽  
Vol 1046 ◽  
pp. 15-21
Author(s):  
Paiboon Limpitipanich ◽  
Pana Suttakul ◽  
Yuttana Mona ◽  
Thongchai Fongsamootr
Keyword(s):  
Elastic Modulus ◽  
Experimental Studies ◽  
Base Material ◽  
Unit Cell ◽  
Material Behavior ◽  
Closed Form Solutions ◽  
The Past ◽  
Weight Density ◽  
Unit Cells ◽  
Cell Patterns

Over the past years, two-dimensional lattices have attracted the attention of several researchers because they are lightweight compared with their full-solid counterparts, which can be used in various engineering applications. Nevertheless, since lattices are manufactured by reducing the base material, their stiffnesses then become lower. This study presents the weight efficiency of the lattices defined by relations between the elastic modulus and the weight density of the lattices. In this study, the mechanical behavior of 2D lattices is described by the in-plane elastic modulus. Experimental studies on the elastic modulus of the 2D lattices made of steel are performed. Three lattices having different unit cells, including square, body-centered, and triangular unit cells, are considered. The elastic modulus of each lattice is investigated by tensile testing. All specimens of the lattices are made of steel and manufactured by waterjet cutting. The experimental results of the elastic modulus of the lattices with the considered unit-cell patterns are validated with those obtained from finite element simulations. The results obtained in this study are also compared with the closed-form solutions founded in the literature. Moreover, the unit-cell pattern yielding the best elastic modulus for the lattice is discussed through weight efficiency.

scholarly journals Periodicity: Interpreting Waves of Information in Osundare’s Harvestcall

2017 ◽  
Vol 10 ◽  
pp. 42-70
Author(s):  
Taofeek Olaiwola Dalamu
Keyword(s):  
Time Frame ◽  
The Past ◽  
Systemic Analysis ◽  
Literary Device ◽  
Different Shapes ◽  
Analytical Tools ◽  
The Waves

The study investigated the waves of information of Osundara’s Harvestcall to show textual movements as layered by the poet. To achieve that objective, the poem of about 76 lines was collapsed into 44 clauses as a tradition that paves a way for systemic analysis of texts in different shapes, sizes and constructs. Halliday’s Theme and Rheme served as analytical tools that processed the text after which the investigation utilized tables and graphs as indicators of waves of information of Harvestcall. The analysis reveals three separate waves of the text, namely: (i) sectional organization – perceives Sections I, II and III are the Theme while Section IV is the Rheme; (ii) clause constructs – demonstrates multiple Themes that flow to rhematic structures; and (iii) time frame exposition – espouses the past farming commitment as Theme and its current neglect as Rheme. In addition, observation shows waves interference. That is, the switching of Theme 2 and Subject Theme in Sections I, II and III for Subject Theme and Theme 2 respectively in Section IV. As linguistic concepts can reveal so much meanings of a literary device, the study suggests their applications across the board of genres of literature.

scholarly journals Loads on a Point-Absorber Wave Energy Converter in Regular and Focused Extreme Wave Events

2020 ◽  
Author(s):  
Eirini Katsidoniotaki ◽  
Edward Ransley ◽  
Scott Brown ◽  
Johannes Palm ◽  
Jens Engström ◽  
...  
Keyword(s):  
Wave Energy ◽  
Wave Train ◽  
Offshore Structures ◽  
Wave Energy Converter ◽  
Extreme Waves ◽  
Extreme Wave ◽  
Energy Converter ◽  
Point Absorber ◽  
Wave Energy Converters ◽  
Extreme Loads

Abstract Accurate modeling and prediction of extreme loads for survivability is of crucial importance if wave energy is to become commercially viable. The fundamental differences in scale and dynamics from traditional offshore structures, as well as the fact that wave energy has not converged around one or a few technologies, implies that it is still an open question how the extreme loads should be modeled. In recent years, several methods to model wave energy converters in extreme waves have been developed, but it is not yet clear how the different methods compare. The purpose of this work is the comparison of two widely used approaches when studying the response of a point-absorber wave energy converter in extreme waves, using the open-source CFD software OpenFOAM. The equivalent design-waves are generated both as equivalent regular waves and as focused waves defined using NewWave theory. Our results show that the different extreme wave modeling methods produce different dynamics and extreme forces acting on the system. It is concluded that for the investigation of point-absorber response in extreme wave conditions, the wave train dynamics and the motion history of the buoy are of high importance for the resulting buoy response and mooring forces.

The History and Status of the Journal of Sport Psychology: 1979-1985

1986 ◽  
Vol 8 (3) ◽  
pp. 149-163 ◽  
Author(s):  
Daniel M. Landers ◽  
Stephen H. Boutcher ◽  
Min Q. Wang
Keyword(s):  
Sport Psychology ◽  
Statistical Tests ◽  
Experimental Studies ◽  
The Past ◽  
Subject Selection ◽  
Research Areas ◽  
Time Period ◽  
Methodological Problems ◽  
The Common ◽  
Single Set

In the past 7 years JSP has evolved to become a respected sport psychology journal. The journal has been uncompromising in the strong research posture it has taken. It is currently the only journal entirely devoted to sport psychology that uses a single set of criteria for evaluating the scientific merit of submitted manuscripts. Over this time period the submitted manuscripts have shown an increase in the number of female principal authors as well as authors being affiliated with departments other than physical education. Survey studies were the most common submittals, but lately there has been a greater emphasis in field experimental studies. Some potential problem areas are noted in subject selection and choice of statistical tests. An examination of research areas revealed that in recent years "motivation" was the most frequently submitted topic. It appeared that other research areas varied in terms of their publishability. The common methodological problems associated with rejection of these types of manuscripts are discussed.

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