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Journal articles on the topic 'Efficiency of Stratification'

Author: Grafiati

Published: 8 September 2023

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1

Rosengarten, G., G. Morrison, and M. Behnia. "A Second Law Approach to Characterising Thermally Stratified Hot Water Storage With Application to Solar Water Heaters." Journal of Solar Energy Engineering 121, no. 4 (1999): 194–200. http://dx.doi.org/10.1115/1.2888166.

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This paper presents a method of characterising and evaluating the performance of hot water storage systems in terms of their temperature distribution. The change in exergy from the stratified state to the delivery state depends on the stored energy and the stratification. It can thus he used to define the storage efficiency for sensible heat storage devices. A new parameter that isolates the stratification component of the exergy is defined and called the stratification efficiency. The effect of temperature distribution, delivery temperature and tank cross-section on exergy and stratification

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2

Sadooghi-Alvandi, S. M. "A NOTE ON THE EFFICIENCY OF PROPORTIONAL STRATIFICATION." Australian Journal of Statistics 30, no. 2 (1988): 196–99. http://dx.doi.org/10.1111/j.1467-842x.1988.tb00850.x.

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3

Roberts, Scott D., James N. Long, and Frederick W. Smith. "Canopy stratification and leaf area efficiency: a conceptualization." Forest Ecology and Management 60, no. 1-2 (1993): 143–56. http://dx.doi.org/10.1016/0378-1127(93)90028-l.

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Myllymäki, Mari, Terje Gobakken, Erik Næsset, and Annika Kangas. "The efficiency of poststratification compared with model-assisted estimation." Canadian Journal of Forest Research 47, no. 4 (2017): 515–26. http://dx.doi.org/10.1139/cjfr-2016-0383.

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Survey sampling with model-assisted estimation has recently gained popularity in forest inventory. Another option for utilizing the auxiliary information is to use poststratification, which is a special case of model-assisted estimation with class variables as explanatory variables. In this study, we compared the efficiency of poststratification with an increasing number of strata with model-assisted estimation. We carried out a study based on a simulated population. We considered four different types of poststratifications, namely (i) stratification based on predictions of a linear model, (ii

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Xie, Bing, John D. Clark, and David D. L. Minh. "Efficiency of Stratification for Ensemble Docking Using Reduced Ensembles." Journal of Chemical Information and Modeling 58, no. 9 (2018): 1915–25. http://dx.doi.org/10.1021/acs.jcim.8b00314.

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6

Ferrarini, Luca, Giancarlo Mantovani, and Marta Pagliarini. "Improving Energy Efficiency in Large Buildings with Thermal Stratification." IFAC Proceedings Volumes 47, no. 3 (2014): 4885–90. http://dx.doi.org/10.3182/20140824-6-za-1003.02532.

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7

Trinuruk, Piyatida, Papangkorn Jenyongsak, and Somchai Wongwises. "Comparative Study of Inlet Structure and Obstacle Plate Designs Affecting the Temperature Stratification Characteristics." Energies 15, no. 6 (2022): 2032. http://dx.doi.org/10.3390/en15062032.

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Temperature stratification between outgoing hot water and incoming cold water is a key factor in diminishing energy loss during the discharging process and maximizing the useful hot water delivered from the tank or enhancing the thermal efficiency of the heating device during the heating process. In this study, the inlet structure and the obstacle plate were designed and modified based on two main factors, the reduction of inlet water velocity and the stipulation of the water recirculation area, to develop temperature stratification through the computational fluid dynamics method. The simulati

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Han, Wang Kook, Jin Man Kim, Tae Hun Lim, Hae Eun Song, and Young Chull Ahn. "Temperature stratification using an air-cooled heat pump system with a mixing valve." Advances in Mechanical Engineering 12, no. 12 (2020): 168781402098465. http://dx.doi.org/10.1177/1687814020984653.

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The main factor determining the performance of a thermal storage method is the temperature stratification in the storage tank. At the ideal stratification, the energy efficiency of the storage tank is extremely high. However, when the heat pump is applied, the stratification is disrupted by heat exchange between the layers of the heat medium, and consequent convection in the tank. Therefore, this study analyzed the influence of stratification-related design factors in the water-piping facility area outside a tank heated by a heat pump. In particular, it assessed the thermal stratification and

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Wissink, Martin, and Rolf Reitz. "The role of the diffusion-limited injection in direct dual fuel stratification." International Journal of Engine Research 18, no. 4 (2016): 351–65. http://dx.doi.org/10.1177/1468087416661867.

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Low-temperature combustion offers an attractive combination of high thermal efficiency and low NO x and soot formation at moderate engine load. However, the kinetically-controlled nature of low-temperature combustion yields little authority over the rate of heat release, resulting in a tradeoff between load, noise, and thermal efficiency. While several single-fuel strategies have achieved full-load operation through the use of equivalence ratio stratification, they uniformly require retarded combustion phasing to maintain reasonable noise levels, which comes at the expense of thermal efficienc

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10

SON, HYO SEOK, JAE-WOOK KWON, SEONG HOON LEE, CHUL KIM, and HIKI HONG. "THE EFFECT OF UPPER-HEATING SYSTEM IN SOLAR WATER STORAGE TANK." International Journal of Air-Conditioning and Refrigeration 22, no. 04 (2014): 1450027. http://dx.doi.org/10.1142/s2010132514500278.

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Thermal stratification in the water storage tank of solar heating system is essential to increase the collection efficiency. We previously investigated the stratification performance of side-heating system, where the hot water returning from the collector heats up the side wall of storage tank. Subsequently, we studied an evolved heating system for further improvement, where we added an upper-heating to the side-heating. Here we thoroughly examine the stratification performance of the evolved heating system using TRNSYS-based simulation. As the essential result, contrary to expectation, evolve

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SAAD, ALIA. "Post Two Way Stratification Analysis for Vaccinations in Sudan." International Journal for Innovation Education and Research 7, no. 12 (2019): 08–14. http://dx.doi.org/10.31686/ijier.vol7.iss12.1689.

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The present research deal with post two stratification analysis for vaccinations data of MICS5 in Sudan. In order to guarantee more precision for estimated indicators: percentage of Child ever given BCG, Polio, PENTA and Measles or MMR vaccination. State and mother education level are determined as two stratification variables since the correlation between them is small and the correlation with target indicators are some of size. So the two way stratification analysis for the four indicators gives more precise estimates the post stratification with high relative efficiency.

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12

Monismith, Stephen G., Jeffrey R. Koseff, and Brian L. White. "Mixing Efficiency in the Presence of Stratification: When Is It Constant?" Geophysical Research Letters 45, no. 11 (2018): 5627–34. http://dx.doi.org/10.1029/2018gl077229.

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13

Xie, Bing, John D. Clark, and David D. L. Minh. "Correction to “Efficiency of Stratification for Ensemble Docking Using Reduced Ensembles”." Journal of Chemical Information and Modeling 59, no. 2 (2019): 944. http://dx.doi.org/10.1021/acs.jcim.9b00077.

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Yin, Lianhao, Gabriel Turesson, Tianhao Yang, Rolf Johansson, and Per Tunestål. "Partially Premixed Combustion (PPC) Stratification Control to Achieve High Engine Efficiency." IFAC-PapersOnLine 51, no. 31 (2018): 694–99. http://dx.doi.org/10.1016/j.ifacol.2018.10.160.

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15

Sahoo, Goloka Behari, and David Luketina. "Bubbler design for reservoir destratification." Marine and Freshwater Research 54, no. 3 (2003): 271. http://dx.doi.org/10.1071/mf02045.

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Two important bubbler-performance criteria, the mechanical efficiency, ηmech, and the destratification time, Γ, were analysed as functions of two dimensionless parameters, G, the strength of stratification, and M, the source strength. Equations to estimate the optimum airflow rate (via M) and corresponding ηmech and Γ for a known linear stratification G in a reservoir were derived. Owing to difficulties in accurately determining the actual G, it was demonstrated that it is appropriate practice to reduce the design G value by around 10%. It was shown that the equivalent linear stratification me

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Lawrie, Andrew G. W., and Stuart B. Dalziel. "Rayleigh–Taylor mixing in an otherwise stable stratification." Journal of Fluid Mechanics 688 (November 3, 2011): 507–27. http://dx.doi.org/10.1017/jfm.2011.398.

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AbstractWe seek to understand the distribution of irreversible energy conversions (mixing efficiency) between quiescent initial and final states in a miscible Rayleigh–Taylor driven system. The configuration we examine is a Rayleigh–Taylor unstable interface sitting between stably stratified layers with linear density profiles above and below. Our experiments in brine solution measure vertical profiles of density before and after the unstable interface is allowed to relax to a stable state. Our analysis suggests that less than half the initially available energy is irreversibly released as hea

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Grujic, I., A. Davinic, N. Stojanovic, J. Doric, and S. Narayan. "The influence of the fuel stratification on the IC engine working cycle with the compressed natural gas." IOP Conference Series: Materials Science and Engineering 1271, no. 1 (2022): 012004. http://dx.doi.org/10.1088/1757-899x/1271/1/012004.

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Abstract The gaseous fuels are very convenient from the economic aspect as well as from the ecology aspect. Fuel stratification allows the engine work with the globally lean mixture and in this way increase the engine efficiency and reduces the pump losses. The separation of the engine working space, on the area where the mixture will be always rich, and on the area where the mixture will be always lean, allows the spark ignition engine work with the globally lean mixture. In the paper it was investigated, how the fuel stratification ratio influences on the combustion process of the compressed

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18

Moreno, Y. M., A. A. Gardea, and A. N. Azarenko. "CALORIMETRIC MEASUREMENTS OF STRATIFYING PEACH SEEDS AND SEEDLING GROWTH." HortScience 27, no. 6 (1992): 685a—685. http://dx.doi.org/10.21273/hortsci.27.6.685a.

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`Lovell' peach seeds were stratified for 0 to 13 weeks at 4C under moist conditions. Heat of metabolism and CO2 evolution, measured by Differential Scanning Calorimetry, increased with stratification time. The calorespirometric ratio increased between 0 and 6 weeks and then remained constant until 13 weeks. Germination percentages paralleled this ratio and reached 80% only after 6 weeks of stratification. After radicle emergence, seedlings from different stratification treatments were grown for 3 weeks. Increasing stratification time resulted in taller seedling growth. Calorimetrically measure

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Xu, Shu Hui, Feng Jiao Zhang, Jian Kai Wang, and Chang Liu. "Numerical Simulation Study of a New Type Solar Collector Wall System." Advanced Materials Research 860-863 (December 2013): 98–102. http://dx.doi.org/10.4028/www.scientific.net/amr.860-863.98.

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In this paper, a new kind of solar collector wall system was designed. Numerical simulation for the orifice plate solar collector wall was carried out to analyze the change of the distributions of the temperature and velocity and the heat collecting efficiency under the conditions of different air inlet velocity. The results shows that the temperature stratification decreases with the increase of the inlet velocity, and the velocity field stratification enhances with the increase of the inlet velocity, and the collection efficiency first increases then decreases with the constantly increasing

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20

Dong, Shiwei, Hui Guo, Ziyue Chen, Yuchun Pan, and Bingbo Gao. "Spatial Stratification Method for the Sampling Design of LULC Classification Accuracy Assessment: A Case Study in Beijing, China." Remote Sensing 14, no. 4 (2022): 865. http://dx.doi.org/10.3390/rs14040865.

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Spatial sampling design is important for accurately assessing land use and land cover (LULC) classification results from remote sensing data. Spatial stratification can dramatically improve spatial sampling efficiency by dividing the study area into several strata when classification correctness is spatially stratified heterogeneous. By integrating the LULC classification results from different sources and spatial resolutions, a spatial stratification method for spatial sampling of accuracy assessment is presented in this paper. Its efficiency is demonstrated in the case study using LULC data

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21

O’Mahony, James F. "Risk Stratification in Cost-Effectiveness Analyses of Cancer Screening: Intervention Eligibility, Strategy Choice, and Optimality." Medical Decision Making 42, no. 4 (2021): 513–23. http://dx.doi.org/10.1177/0272989x211050918.

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Introduction There is increasing interest in risk-stratified approaches to cancer screening in cost-effectiveness analysis (CEA). Current CEA practice regarding risk stratification is heterogeneous and guidance on the best approach is lacking. This article suggests how stratification in CEA can be improved. Methods I use a simple example of a hypothetical screening intervention with 3 potential recipient risk strata. The screening intervention has 6 alternative intensities, each with different costs and effects, all of which vary between strata. I consider a series of alternative stratificatio

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Brown, John P., and Richard G. Oderwald. "Sampling estimators of total mill receipts for use in timber product output studies." Canadian Journal of Forest Research 42, no. 3 (2012): 476–89. http://dx.doi.org/10.1139/x11-183.

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Data from the 2001 timber product output study for Georgia was explored to determine new methods for stratifying mills and finding suitable sampling estimators. Estimators for roundwood receipts totals comprised several types: simple random sample, ratio, stratified sample, and combined ratio. Two stratification methods were examined: the Dalenius–Hodges (DH) square root of the frequency method and a cluster analysis method. Three candidate sizes for the number of groups were selected from the cluster analysis and subsequently used in the DH stratification as well. Relative efficiency improved

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Górnik, Krzysztof, Mieczysław Grzesik, Regina Janas, Edward Żurawicz, Ewa Chojnowska, and Renata Góralska. "The Effect of Apple Seed Stratification with Growth Regulators on Breaking the Dormancy of Seeds, the Growth of Seedlings and Chlorophyll Fluorescence." Journal of Horticultural Research 26, no. 1 (2018): 37–44. http://dx.doi.org/10.2478/johr-2018-0004.

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Abstract The aim of the study was to shorten the period of breaking dormancy in apple seeds and to improve the growth of the seedlings of ‘Gold Milenium’, ‘Ligol’ and ‘Szampion’. The whole seeds were removed from fruits directly after the harvest and were subjected to stratification (3 °C for 90 days in darkness) in distilled water or an aqueous solutions of 500 mM salicylic acid (SA), 10−3 M jasmonic acid (JA), gibberellin A3 (GA3) and 6-benzylaminopurine (BAP) at 250 mg·dm−3 and 100 mg·dm−3, respectively. Growth regulators were applied separately or in a mixture containing SA, JA, GA3 and BA

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Kovalnogov, V. N., R. V. Fedorov, and D. A. Generalov. "Study of the thermal state of urbomachine blades by means of software complex." Izvestiya MGTU MAMI 8, no. 4-1 (2014): 27–32. http://dx.doi.org/10.17816/2074-0530-67641.

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The article considers the method for calculating of thermal state of turbomachine blades using software complex. The authors consider the possibility of using of gas dynamic temperature stratification phenomenon to improve efficiency of turbomachine blade cooling systems. The mathematical formulation is given for non-stationary problem of calculating of blades thermal state under the gas-dynamic temperature stratification.

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Tsynaeva, A. A., E. A. Tsynaeva, and E. V. Shkolin. "Using heat pipes to improve the efficiency of gas-dynamic thermal stratification." VESTNIK of the Samara State Aerospace University, no. 3-2(41) (December 25, 2013): 192. http://dx.doi.org/10.18287/1998-6629-2013-0-3-2(41)-192-197.

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Yelskyi, I. K., A. A. Vasylyev, and N. L. Smirnov. "THE EFFICIENCY OF PROGNOSTIC SCALES IN STRATIFICATION OF ACUTE PANCREATITIS. LITERATURE REVIEW." Surgical practice, no. 3 (December 4, 2020): 17–28. http://dx.doi.org/10.38181/2223-2427-2020-3-17-28.

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The work carried out by analyzes of the literature data on assessing the severity of acute pancreatitis and predicting its course and mortality. A comparison of traditional point scales for assessing the severity of AP was made.As a result of a comparative analysis, it was found that the most objective instrumental method for diagnosing acute pancreatitis and its complications was MSCT with the determination of the CT index of severity. Balthazar scale allows assessing the severity of the disease and forming a prognosis for the development of complications. However, computed or magnetic resona

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Tsynaeva, Anna A., Maxim N. Nikitin, and Ekaterina A. Tsynaeva. "Study of thermal and hydraulic efficiency of supersonic tube of temperature stratification." Journal of Physics: Conference Series 891 (November 10, 2017): 012047. http://dx.doi.org/10.1088/1742-6596/891/1/012047.

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Dandekar, Rajat, Vaseem A. Shaik, and Arezoo M. Ardekani. "Swimming sheet in a density-stratified fluid." Journal of Fluid Mechanics 874 (July 4, 2019): 210–34. http://dx.doi.org/10.1017/jfm.2019.445.

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In this work, we theoretically investigate the swimming velocity of a Taylor swimming sheet immersed in a linearly density-stratified fluid. We use a regular perturbation expansion approach to estimate the swimming velocity up to second order in wave amplitude. We divide our analysis into two regimes of low ($\ll O(1)$) and finite Reynolds numbers. We use our solution to understand the effect of stratification on the swimming behaviour of organisms. We find that stratification significantly influences motility characteristics of the swimmer such as the swimming speed, hydrodynamic power expend

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JOURDAIN, BENJAMIN, BERNARD LAPEYRE, and PIERGIACOMO SABINO. "CONVENIENT MULTIPLE DIRECTIONS OF STRATIFICATION." International Journal of Theoretical and Applied Finance 14, no. 06 (2011): 867–97. http://dx.doi.org/10.1142/s0219024911006772.

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This paper investigates the use of multiple directions of stratification as a variance reduction technique for Monte Carlo simulations of path-dependent options driven by Gaussian vectors. The precision of the method depends on the choice of the directions of stratification and the allocation rule within each strata. Several choices have been proposed but, even if they provide variance reduction, their implementation is computationally intensive and not applicable to realistic payoffs, in particular not to Asian options with barrier. Moreover, all these previously published methods employ orth

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Ijichi, Takashi, and Toshiyuki Hibiya. "Observed Variations in Turbulent Mixing Efficiency in the Deep Ocean." Journal of Physical Oceanography 48, no. 8 (2018): 1815–30. http://dx.doi.org/10.1175/jpo-d-17-0275.1.

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AbstractRecent progress in direct numerical simulations (DNSs) of stratified turbulent flows has led to increasing attention to the validity of the constancy of the dissipation flux coefficient Γ in the Osborn’s eddy diffusivity model. Motivated by lack of observational estimates of Γ, particularly under weakly stratified deep-ocean conditions, this study estimates Γ using deep microstructure profiles collected in various regions of the North Pacific and Southern Oceans. It is shown that Γ is not constant but varies significantly with the Ozmidov/Thorpe scale ratio ROT in a fashion similar to

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de Lavergne, Casimir, Gurvan Madec, Julien Le Sommer, A. J. George Nurser, and Alberto C. Naveira Garabato. "The Impact of a Variable Mixing Efficiency on the Abyssal Overturning." Journal of Physical Oceanography 46, no. 2 (2016): 663–81. http://dx.doi.org/10.1175/jpo-d-14-0259.1.

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AbstractIn studies of ocean mixing, it is generally assumed that small-scale turbulent overturns lose 15%–20% of their energy in eroding the background stratification. Accumulating evidence that this energy fraction, or mixing efficiency Rf, significantly varies depending on flow properties challenges this assumption, however. Here, the authors examine the implications of a varying mixing efficiency for ocean energetics and deep-water mass transformation. Combining current parameterizations of internal wave-driven mixing with a recent model expressing Rf as a function of a turbulence intensity

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Hassan, Jafar Mehdi, Qussai Jihad Abdul-Ghafour, and Mohammed Fowzi Mohammed. "Experimental Study of the Thermal Performance of Flat Plate Solar Collectors Array by Different Connection Configurations." Journal of Engineering 21, no. 5 (2015): 55–71. http://dx.doi.org/10.31026/j.eng.2015.05.05.

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The current research illustrates experimentally the effect of series and parallel connection (Z-I Configurations) of flat plate water solar collectors array on the thermal performance of closed loop solar heating system. The study includes the effect of changing the water flow rate on the thermal efficiency. The results show that, the collector's efficiency in series connection is higher than the parallel connection within flow rate level less than (100) ℓ/hr. Moreover, the collector efficiency in parallel connection of (I-Configurations) is more than the (Z- Configurations) with increasing th

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Jackson, P. Ryan, and Chris R. Rehmann. "Laboratory Measurements of Differential Diffusion in a Diffusively Stable, Turbulent Flow." Journal of Physical Oceanography 33, no. 8 (2003): 1592–603. http://dx.doi.org/10.1175/2405.1.

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Abstract Laboratory experiments were performed to determine the conditions under which differential diffusion occurs and to evaluate its effect on the mixing efficiency. Diffusively stable profiles of temperature and salinity were stirred steadily by horizontally oscillating vertical rods. The two-component stratification ensures that both scalars experience the same stratification and forcing, or Richardson and Reynolds numbers. The eddy diffusivities KT and KS, for temperature and salinity, were estimated by fitting theoretical solutions of diffusion equations to measured profiles, and the m

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Rabiu, Adam, Abubakar Yahaya, and Muhammad Abdulkarim. "MODIFICATION OF SEPARATE RATIO TYPE EXPONENTIAL ESTIMATOR: A POST-STRATIFICATION APPROACH." FUDMA JOURNAL OF SCIENCES 5, no. 2 (2021): 404–12. http://dx.doi.org/10.33003/fjs-2021-0502-629.

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In this research, modification of separate ratio type exponential estimator introduced in an earlier study is proposed. Expressions for the bias and mean square error (MSE) of the proposed estimator up to first degree of approximation are derived. The optimum value of the constant which minimize the MSE of the suggested estimator is also obtained. In the same vein, efficiency comparisons between the proposed estimator and some related existing ones under the case of post-stratification is conducted. Empirical studies have been conducted to demonstrate the efficiencies of the suggested estimato

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Tsynaeva, A. A., and M. N. Nikitin. "Effect of Heat Transfer Surface Shape on Efficiency of Gas Dynamic Temperature Stratification." Russian Aeronautics 60, no. 4 (2017): 627–31. http://dx.doi.org/10.3103/s1068799817040213.

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Arnold, Christian Cornelius, Jens von der Grün, Mark Christoph Brekner, et al. "Risk stratification by anamnesis increases SARS-CoV-2 test efficiency in cancer patients." Strahlentherapie und Onkologie 198, no. 4 (2021): 354–60. http://dx.doi.org/10.1007/s00066-021-01853-7.

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Abstract Purpose To evaluate the impact of testing asymptomatic cancer patients, we analyzed all tests for severe acute respiratory syndrome coronavirus-2 (SARS-CoV-2) before and during radiotherapy at a tertiary cancer center throughout the second wave of the pandemic in Germany. Methods Results of all real-time polymerase chain reaction (RT-PCR) tests for SARS-CoV‑2 performed at our radio-oncology department between 13 October 2020 and 11 March 2021 were included. Clinical data and anamnestic information at the time of testing were documented and examined for (i) the presence of COVID-19-rel

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Otto, Henning, Christian Resagk, and Christian Cierpka. "Optical Measurements on Thermal Convection Processes inside Thermal Energy Storages during Stand-By Periods." Optics 1, no. 1 (2020): 155–72. http://dx.doi.org/10.3390/opt1010011.

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Thermal energy storages (TES) are increasingly important for storing energy from renewable energy sources. TES that work with liquid storage materials are used in their most efficient way by stratifying the storage fluid by its thermal density gradient. Mixing of the stratification layers during stand-by periods decreases the thermal efficiency of the TES. Tank sidewalls, unlike the often poorly heat-conducting storage fluids, promote a heat flux from the hot to the cold layer and lead to thermal convection. In this experimental study planar particle image velocimetry (PIV) measurements and ba

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Hu, Zongjie, Junjie Zhang, Magnus Sjöberg, and Wei Zeng. "The use of partial fuel stratification to enable stable ultra-lean deflagration-based Spark-Ignition engine operation with controlled end-gas autoignition of gasoline and E85." International Journal of Engine Research 21, no. 9 (2019): 1678–95. http://dx.doi.org/10.1177/1468087419889702.

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Lean operation of Spark-Ignition engines can provide higher thermal efficiency compared to standard stoichiometric operation. However, for a homogeneous lean mixture, the associated reduction of flame speeds becomes an important issue from the perspective of robust ignition and fast flame spread throughout the charge. This study is focused on the use of a lean partial fuel stratification strategy that can stabilize the deflagration, while sufficiently fast combustion is ensured via the use of end-gas autoignition. The engine has a spray-guided Direct-Injection Spark-Ignition combustion system

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Chung, Bryan Ping Ho. "Stratification of stroke rehabilitation: Five-year profiles of functional outcomes." Hong Kong Physiotherapy Journal 38, no. 02 (2018): 141–47. http://dx.doi.org/10.1142/s1013702518500129.

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Background: Stroke rehabilitation in inpatient setting requires high intensity of manpower and resources. Early stratification of patients with stroke could facilitate early discharge plan and reduce avoidable length of stay (LOS) in hospital. Stratification of patients with stroke in clinical setting is usually based on functional scores which are quite time-consuming and require a special training to complete the full score.Objective: The objective of the study was to explore whether Modified Functional Ambulation Category (MFAC) can serve as a stratification tool of patients with stroke in

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Poletto, Tales, Marlove Fátima Brião Muniz, Igor Poletto, Valdir Marcos Stefenon, Caciara Gonzatto Maciel, and Jéssica Emilia Rabusque. "Dormancy overcome and seedling quality of pecan in nursery." Ciência Rural 46, no. 11 (2016): 1980–85. http://dx.doi.org/10.1590/0103-8478cr20150835.

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ABSTRACT: This study evaluated the efficiency of methods to overcome seed dormancy in different storage periods in the production of pecan seedlings. Seeds were submitted to the following treatments: T1, T4 and T7 - control treatments (seeds with no treatment, stored at room temperature for 30, 60 and 90 days, respectively), T2, T5 and T8 - stratification (seeds were distributed in boxes with wet sand maintained at a temperature of 4°C for 30, 60 and 90 days, respectively), T3, T6 and T9 - scarification + stratification (seeds scarified with sandpaper n.80 and stratified by 30, 60 and 90 days,

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Alvandi, Amirhossein, and Armin Hatefi. "Analysis of Ordinal Populations from Judgment Post-Stratification." Stats 6, no. 3 (2023): 812–38. http://dx.doi.org/10.3390/stats6030052.

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In surveys requiring cost efficiency, such as medical research, measuring the variable of interest (e.g., disease status) is expensive and/or time-consuming; however, we often have access to easily obtainable characteristics about sampling units. These characteristics are not typically employed in the data collection process. Judgment post-stratification (JPS) sampling enables us to supplement the random samples from the population of interest with these characteristics as ranking information. This paper develops methods based on the JPS samples for estimating categorical ordinal populations.

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Smusz, Robert, Paweł Kielan, and Damian Mazur. "Analysis of thermal stratified storage tank." Archives of Electrical Engineering 66, no. 3 (2017): 631–42. http://dx.doi.org/10.1515/aee-2017-0048.

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Abstract The basic aim of the task is to compile a temperature stratification system in an accumulation tank. The range of the thesis concerns the shape and dimensions of a stratification system for an accumulation tank. Thermal stratification is a process that comprises the maintaining of temperature stratification at different levels of an accumulation tank which reduce to a minimum the process of temperature equalization. It results from the fact that the thermal stratification in a tank significantly increases the installation efficiency and improves the process of energy storing. It is co

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Houšková, Kateřina, Jan Klepárník, and Oldřich Mauer. "How to accelerate the germination of Scots pine and Norway spruce seeds?" Journal of Forest Science 67, No. 3 (2021): 134–42. http://dx.doi.org/10.17221/133/2020-jfs.

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The aim of the study was to confirm and compare efficiency of methods enhancing the vitality of Scots pine and Norway spruce seeds: soaking in water, cold stratification, additional moistening and incubation according to IDS method. The examined parameters included water content in the seeds, germination energy, mean germination time and germination capacity before the seed treatment, after its treatment by the tested methods and after drying. Results show that all the tested methods accelerate germination of seeds; cold stratification is the most efficient and recommended method for Scots pin

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Suverneva, A. A., and I. V. Ignatko. "Current approach to perinatal risk stratification." Voprosy ginekologii, akušerstva i perinatologii 20, no. 4 (2021): 69–77. http://dx.doi.org/10.20953/1726-1678-2021-4-69-77.

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Objective. To develop a new approach to perinatal risk stratification based on the determination of prognostic criteria for antepartum and intrapartum fetal death, and early neonatal death to improve the efficiency of predicting adverse perinatal outcomes. Patients and methods. A retrospective case-control study with the participation of patients with antepartum (n = 134) and intrapartum (n = 41) fetal death, early neonatal death (n = 61), and favorable perinatal outcome (n = 50) was carried out. The Bayes–Wald–Gubler method was used to determine prognostic criteria. Comparative evaluation of

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Haller, Michel Y., Cynthia A. Cruickshank, Wolfgang Streicher, Stephen J. Harrison, Elsa Andersen, and Simon Furbo. "Methods to determine stratification efficiency of thermal energy storage processes – Review and theoretical comparison." Solar Energy 83, no. 10 (2009): 1847–60. http://dx.doi.org/10.1016/j.solener.2009.06.019.

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Azanov, Georgii M., and Alexander N. Osiptsov. "The efficiency of one method of machineless gasdynamic temperature stratification in a gas flow." International Journal of Heat and Mass Transfer 106 (March 2017): 1125–33. http://dx.doi.org/10.1016/j.ijheatmasstransfer.2016.10.090.

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Rosen, M. A., and I. Dincer. "THERMAL STORAGE AND EXERGY ANALYSIS: THE IMPACT OF STRATIFICATION." Transactions of the Canadian Society for Mechanical Engineering 23, no. 1B (1999): 173–86. http://dx.doi.org/10.1139/tcsme-1999-0012.

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The importance and usefulness of second-law analysis for evaluating and comparing thermal energy storage (TES) systems in meaningful ways is discussed. Some of the main thermodynamic factors to be considered in evaluating TES performance are identified and described, including determining important analysis quantities, obtaining appropriate measures of efficiency, pinpointing losses, assessing the effects of stratification, and accounting for time duration of storage. As an illustrative example, exergy analysis, a particular type of second-law analysis, is applied to stratified TES systems in

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Macdonald, R. J., and A. Ernst. "Disinfection Efficiency and Problems Associated with Maturation Ponds." Water Science and Technology 18, no. 10 (1986): 19–29. http://dx.doi.org/10.2166/wst.1986.0107.

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Reductions in densities of indicator organisms and pathogens were measured in maturation ponds receiving secondary effluents from trickling filter and activated sludge treatment works. Effluent detention times in the ponds were determined using dye tracing techniques and compared with nominal detention times calculated from pond volumes and effluent flow rates. Median detention times were substantially less than nominal times because of short circuiting due to pond design aspects and thermal stratification. Maturation ponds of 10 days median detention time were found to successfully disinfect

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Macdonald, R. J., and A. Ernst. "Disinfection Efficiency and Problems Associated with Maturation Ponds." Water Science and Technology 19, no. 3-4 (1987): 557–67. http://dx.doi.org/10.2166/wst.1987.0235.

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Reductions in densities of indicator organisms and pathogens were measured in maturation ponds receiving secondary effluents from trickling filter and activated sludge treatment works. Effluent detention times in the ponds were determined using dye tracing techniques and compared with nominal detention times calculated from pond volumes and effluent flow rates. Median detention times were substantially less than nominal times because of short circuiting due to pond design aspects and thermal stratification. Maturation ponds of 10 days median detention time were found to successfully disinfect

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Varodompun, Jatuwat, and Mojtaba Navvab. "HVAC Ventilation Strategies: The Contribution for Thermal Comfort, Energy Efficiency, and Indoor Air Quality." Journal of Green Building 2, no. 2 (2007): 131–50. http://dx.doi.org/10.3992/jgb.2.2.131.

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In Heating Ventilating and Air Conditioning (HVAC) systems, ventilation strategies impact building energy consumption, occupants' thermal comfort and Indoor Air Quality (IAQ). Ventilation strategies such as Mixing Jet Ventilation (MJV), Displacement Ventilation (DV), and Impinging Jet Ventilation (IJV) are operated on the different principals. MJV relies on dilution, while DV and IJV rely on both dilution and stratification. Due to climatic variation, ventilation strategies must be operated under different cooling and heating load scenarios. Typically, each ventilation strategy controls the in

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