scholarly journals DEM simulation of cyclic tests on an offshore screw pile for floating wind

2021 ◽  
Author(s):  
Wei Wang ◽  
◽  
Michael Brown ◽  
Matteo Ciantia ◽  
Yaseen Sharif ◽  
...  
Keyword(s):  
Accumulation Rate ◽  
Maximum Velocity ◽  
Uplift Capacity ◽  
Cyclic Performance ◽  
Cyclic Tests ◽  
High Demand ◽  
Dem Simulation ◽  
Screw Pile ◽  
Physical Tests ◽  
Very High

Screw piles need to be upscaled for offshore use e.g. being an alternative foundation and anchor form for offshore floating wind turbines, although the high demand of vertical installation forces could prevent its application if conventional pitch-matched installation is used. Recent studies, using numerical and centrifuge physical tests, indicated that the vertical installation force can be reduced by adopting over-flighting which also improved axial uplift capacity of the screw pile. The current study extends the scope to axial cyclic performance with respect to the installation approach. Using quasi-static discrete element method (DEM) simulation it was found that the over-flighted screw pile showed a lower displacement accumulation rate, compared to a pitch-matched installed pile, in terms of load-controlled cyclic tests. Sensitivity analysis of the setup of the cyclic loading servo shows the maximum velocity during the tests should be limited to avoid significant exaggeration of the pile displacement accumulation but this may lead to very high run durations.

Sources of Variability in Dose Response Platelet Aggregometry

1985 ◽  
Vol 53 (02) ◽  
pp. 219-220 ◽  
Author(s):  
M V Vickers ◽  
S G Thompson
Keyword(s):  
Dose Response ◽  
Maximum Velocity ◽  
Adenosine Diphosphate ◽  
Method Error ◽  
Platelet Aggregability ◽  
Differential Effects ◽  
Platelet Aggregometry ◽  
Simultaneous Comparison ◽  
Aggregation Parameters ◽  
Very High

SummaryAn experiment designed to assess the components of variability of a number of measures of platelet aggregability showed that the ADP ED50 (the estimated dose of adenosine diphosphate at which primary aggregation occurs at half its maximum velocity) had the least method error of any of the parameters measured, but that none had a very high between-person component of variability. A simultaneous comparison of a syringe technique and a free-flowing technique for venepuncture revealed no differential effects on the aggregation parameters measured. An enforced increase in the stirring speed in the aggregometer led to an experiment which showed that such a change did not apparently affect the ED50s.

Geochronology of Middle and Upper Pleistocene Loess Sections in Hungary

1997 ◽  
Vol 48 (3) ◽  
pp. 291-312 ◽  
Author(s):  
Manfred Frechen ◽  
Erzsébet Horváth ◽  
Gyula Gábris
Keyword(s):  
Accumulation Rate ◽  
Luminescence Dating ◽  
Glacial Cycle ◽  
Last Interglacial ◽  
High Accumulation ◽  
Oxygen Isotope Stage ◽  
Infrared Stimulated Luminescence ◽  
Derivatives Of ◽  
Very High ◽  
The Last Glacial

The application of both thermoluminescence and infrared stimulated luminescence dating to the extensively studied “classical” Hungarian loess/paleosol sequences from Basaharc, Mende, and Paks provides a reliable chronological framework and climatostratigraphic reconstruction for the last interglacial/glacial cycle. Based on this combined luminescence dating study a new chronology is proposed for the “Young Loess” in Hungary. Luminescence dating suggests that the loess below the MF2 horizon formed during the penultimate glaciation. The MF1 horizon probably formed during an interstade within oxygen isotope stage 3. For the youngest loess, overlying MF1, a very high accumulation rate was determined. Large time gaps occur above MF2 and MF1, indicating that most of the record of the last glaciation is missing in the standard sections at Basaharc, Mende, and Paks. Either large discontinuities or a very low accumulation rate occurred in all three type sections during the soil-forming periods. High-resolution studies of climatic proxies using this combined luminescence dating approach provide a reliable chronological framework for loess and loess derivatives of the last glacial cycle in Hungary, although a precise and complete chronostratigraphic reconstruction cannot be achieved from the incomplete records found at these sites.

Reducing Dissolved Oxygen Under Conditions of High Air Ingress

2002 ◽  
Author(s):  
Joseph W. Harpster
Keyword(s):  
Dissolved Oxygen ◽  
Measurement Data ◽  
Theoretical Description ◽  
Back Pressure ◽  
Design Features ◽  
High Demand ◽  
Free Air ◽  
Mixture Dynamics ◽  
Air Ingress ◽  
Very High

Recent considerations of steam and air mixture dynamics in operating condensers has led to a more thorough understanding of how condenser performance is affected by air in-leakage. Results of this model-based theoretical description, which are in agreement with measurement data from operating condensers, are reviewed and used to propose beneficial design features for new and re-tubed condenser assemblies. It is anticipated from this work, that condensers can be designed which significantly reduce the amount of dissolved oxygen in condensate from locations of free air ingress above the hotwell level. This reduction also applies to other undesirable noncondensables that enter condensate driven by the same mechanism contributing to dissolved oxygen. When air in-leakage becomes sufficiently high, it contributes to excess back pressure on the turbine. In this region of high air in-leakage, the amount of dissolved oxygen can become very high. The design therefore, minimizes or eliminates the corrosive effects of air inleakage, both high and low, which is particularly important during periods of high demand when load must be maintained.

scholarly journals Assessment of rainwater harvesting tank size for livestock use

2017 ◽  
Vol 18 (2) ◽  
pp. 555-566 ◽  
Author(s):  
P. A. Londra ◽  
A. T. Theocharis ◽  
E. Baltas ◽  
V. A. Tsihrintzis
Keyword(s):  
Rainwater Harvesting ◽  
Daily Rainfall ◽  
Annual Rainfall ◽  
Dry Period ◽  
High Demand ◽  
Sheep Farm ◽  
Daily Water ◽  
Demand Scenario ◽  
Very High ◽  
Of Greece

Abstract Rainwater harvesting is an ancient practice aiming to cover water needs for domestic, irrigation and livestock uses. In this study, the rainwater harvesting tank size was investigated to meet five water-need levels of a mixed goat–sheep farm using a daily water balance method. This method was applied using daily rainfall data for a period of 16 years from six meteorological stations in selected regions of Greece, characterized by different rainfall regimes and well-developed livestock activity, taking into account, among other parameters, the water needs of animals, the rainwater collection area and the runoff coefficient. There is a great variation in the rainwater harvesting tank size among the stations studied due to differences in the annual rainfall and the maximum dry period. Results showed that meeting full demands (100% reliability) requires tank sizes ranging from 20 m3 for short dry period stations–low demand scenario (320 L/day) to 115 m3 for long dry period stations–high demand scenario (576 L/day), assuming a maximum collection area of 450 m2. Correspondingly, reliability analysis showed that very high values of reliability (95%) can be obtained with tank sizes ranging from 10 to 85 m3, respectively.

scholarly journals Prevalence of insomnia in elderly and drug prescriptions

2014 ◽  
Vol 5 (1) ◽  
pp. 5-12
Author(s):  
Consuelo Ibañez ◽  
Diego R. Dueñas ◽  
Mª Rosa Sánchez-Waisen
Keyword(s):  
Older People ◽  
Sleep Disorders ◽  
Psychotropic Drugs ◽  
Well Being ◽  
The Elderly ◽  
Medical Comorbidity ◽  
High Demand ◽  
Health And Well Being ◽  
Very High ◽  
Diagnosis Age

Sleep disorders are very frequent in the elderly and it affects health and well-being of older people. Some authors estimate that the prevalence of insomnia in the elderly is very high, close to 60%. Sleep disorders in the elderly are frequent and it causes high demand for care. Some authors think that it will affect a lot in health of older people and those who take care of them. This could bring an increase of institutionalization. With this work we wanted to measure prevalence of insomnia in those chronic and psychogeriatric patients who are in nursing-homes, and which psychotropic drugs are prescribed for control it. In addition, we have studied if there is significant relationship between psychiatric diagnosis, neurologic diagnosis, age or sex, medical comorbidity, and the presence of insomnia.

scholarly journals Mengelola Pendapatan Kamar Hotel yang Optimum (Yield Management)

Media Wisata ◽  
2021 ◽  
Vol 5 (2) ◽  
Author(s):  
Budi Hermawan
Keyword(s):  
Low Income ◽  
Yield Management ◽  
Optimum Level ◽  
Hotel Management ◽  
High Demand ◽  
Know How ◽  
The Individual ◽  
High Level ◽  
Occupancy Rates ◽  
Very High

The market is always changing and increasing competition. In this condition, the hotel needs to improve responsiveness to the environment to service. Hotels should be able to establish a policy with the best results. Yield management offers a concept for each hotel is able to put himself in the best position in the changing environment. Revenues need to be managed well for a more popular method is called yield management or revenue management Currently, yield management, has become a very important innovation in the hospitality industry. The main objective of yield management is to maximize the occupancy room and at the same price achieved average room rate is high. The rooms are the same product, but have different market segments, both used by the guest or guest tours individual. Each market segment may be subject to different prices for the same period. Demand for each segment in the future, have a fairly high level of uncertainty in thiscase, management does not know how much and when the individual guest is coming. Individual guest room reservations typically do on arrival or a few days prior to say, while guest tour groups generally pay full price and keep the rooms are not already sold to the tourist gueist at cheap prices or discounts. Profit oriented hotel management and have broad freedom of action to increase revenue at the optimum level of demand for rooms is very high. This is to compensate low income or cover losses in the period of very Iow occupancy rates, where rooms are sold at discount in nearly all segments. Room sales management to achieve optimum opinions need to plan how many rooms are sold at a discount and how many rooms were sold at full price. In addition . to avoid loss of revenue due to cancellation of booking rooms during periode of high demand for rooms, management needs to accept room reservations exceeds the number of rooms available for sale

CFD Analysis on the Influence of Coolant Distribution Blocks on the Core Hot Spot Temperature in a Prismatic Very High Temperature Reactor

2011 ◽  
Author(s):  
Min-Hwan Kim ◽  
Nam-il Tak ◽  
Jae Man Noh ◽  
Goon-Cherl Park
Keyword(s):  
High Temperature ◽  
Hot Spot ◽  
Maximum Velocity ◽  
Unit Cell ◽  
Normal Operation ◽  
The Core ◽  
Very High Temperature Reactor ◽  
Velocity Deviation ◽  
High Temperature Reactor ◽  
Very High

Two design options of core distribution block (CDB) for a cooled-vessel design in the Very High Temperature Reactor (VHTR) were developed and the influence on the core hot spot was investigated by the commercial computational fluid dynamics (CFD) code, CFX-11. Isothermal CFD analyses were performed to estimate the coolant flow variation at the inlet of the coolant channel. The results predicted about 5% of the maximum velocity deviation when applying the core pressure drop of NHDD PMR200. A unit-cell CFD model was used to access the effect of the velocity deviation on the core hot spot. The unit-cell analyses were carried out for the velocity deviation of 0%, 5%, and 10%. Not only a constant power but also a local maximum power profile was considered. According to the results, the maximum fuel temperature was increased by about 30°C for the velocity deviation of 10% but still below the normal operation limit of 1250°C.

scholarly journals Iron Transport across Symbiotic Membranes of Nitrogen-Fixing Legumes

2021 ◽  
Vol 22 (1) ◽  
pp. 432
Author(s):  
David A. Day ◽  
Penelope M. C. Smith
Keyword(s):  
Iron Transport ◽  
Root Nodules ◽  
Nitrogen Fixing ◽  
High Demand ◽  
Symbiosome Membrane ◽  
Essential Nutrient ◽  
Infected Cells ◽  
Very High

Iron is an essential nutrient for the legume-rhizobia symbiosis and nitrogen-fixing bacteroids within root nodules of legumes have a very high demand for the metal. Within the infected cells of nodules, the bacteroids are surrounded by a plant membrane to form an organelle-like structure called the symbiosome. In this review, we focus on how iron is transported across the symbiosome membrane and accessed by the bacteroids.

scholarly journals Prevalence of insomnia in elderly and drug prescriptions

2014 ◽  
Vol 5 (1) ◽  
pp. 5-12
Author(s):  
Consuelo Ibañez ◽  
Diego R. Dueñas ◽  
Mª Rosa Sánchez-Waisen
Keyword(s):  
Older People ◽  
Sleep Disorders ◽  
Psychotropic Drugs ◽  
Well Being ◽  
The Elderly ◽  
Medical Comorbidity ◽  
High Demand ◽  
Health And Well Being ◽  
Very High ◽  
Diagnosis Age

Sleep disorders are very frequent in the elderly and it affects health and well-being of older people. Some authors estimate that the prevalence of insomnia in the elderly is very high, close to 60%. Sleep disorders in the elderly are frequent and it causes high demand for care. Some authors think that it will affect a lot in health of older people and those who take care of them. This could bring an increase of institutionalization. With this work we wanted to measure prevalence of insomnia in those chronic and psychogeriatric patients who are in nursing-homes, and which psychotropic drugs are prescribed for control it. In addition, we have studied if there is significant relationship between psychiatric diagnosis, neurologic diagnosis, age or sex, medical comorbidity, and the presence of insomnia.

scholarly journals Model Sistem Perparkiran Kendaraan di Bandar Udara Sentani Jayapura

2018 ◽  
Vol 22 (2) ◽  
pp. 137-142
Author(s):  
Johanis Taran ◽  
Sakti Adji Adisasmita ◽  
Mubassirang Pasra
Keyword(s):  
Data Analysis ◽  
Data Collection ◽  
Accumulation Rate ◽  
Parking Space ◽  
Parking Lots ◽  
Turn Over ◽  
The Impact ◽  
The Relationship ◽  
Very High

This study aims to determine the characteristics of existing conditions, the perceptions of respondents of parking users, and the need for parking space based on the highest accumulation rate. Methods of data collection are done by a direct survey to the field to record the number and time of the vehicle when entering and exiting and survey the perception of respondents parking users by using questionnaires. The result of data analysis shows that the average daily vehicle volume is 2649 with the highest average accumulation is 639. Average vehicle duration per day is 1.65 vehicles/hour, average parking turn over value of 6 and parking index of 1.48%, this means that on average per day only 6 vehicles alternately occupy 1 parking space. Low parking turnover is due to the very high vehicle volume with a long parking duration but parking space available is very less ie as many as 432 parking spaces, so that the impact on over-capacity parking that can be seen from the high number of parking accumulation that occurred at the peak hour is at 12:30 to 13:00 pm. Of 313 respondents of parking users who responded to 16 parameters about the characteristics of parking lots, 5% stated very worthy, 23% stated feasible, 57% said it was not feasible, 11% expressed bad, and 5% said very badly. The model of parking space needs shows the relationship between vehicle volume and accumulation of R = 0,67 with the modely = 0,06972x + 454,07, Capacity and accumulation of R = 0,62,with the model y = 0,0696x + 454,07, Duration and accumulation of R = 0,60 with the model y = -91,72x + 789,49.

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