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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.

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At least 37 records · Page 2
All sourcesNASA NTRSDOE OSTI
DOE OSTI2019

Synthesis and Characterization of Natural Nano-hydroxyapatite Derived from Turkey Femur-Bone Waste

Hydroxyapatite (HAp) is a bioactive and vital material which has found many applications in the biomedical and clinical fields. This bio-ceramic powder can be synthesized via different bio-waste materials. In this study, the production of natural nanohydroxyapatite was produced through calcination of untreated turkey femur-bone waste powder at 850 °C followed by ball milling the powder. The obtained powder was characterized using X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR) analysis. The morphology, size, and elemental composition of obtained turkey hydroxyapatite (THA) particles were investigated by scanning electron microcopy (SEM), transmission electron microcopy (TEM), and energy dispersive spectroscopy (EDS) analysis, in which the average particle size of ball milled THA was found to be about 85 nm with a Ca/P ratio of 1.63. The powder was then cold pressed and later sintered at 850, 950, 1050, and 1150 °C to evaluate its mechanical properties in terms of compressive strength and hardness. The results revealed that the strength and hardness of the samples increased by increasing the sintering temperature up to 1150 °C. Finally, the maximum values of hardness and compressive strength of the sintered THA were obtained at 1150 °C (37.44 MPa and 3.2 GPa, respectively).

60 APPLIED LIFE SCIENCES↗
DOE OSTI2023

ANN-based ground motion model for Turkey using stochastic simulation of earthquakes

SUMMARY Turkey is characterized by a high level of seismic activity attributed to its complex tectonic structure. The country has a dense network to record earthquake ground motions; however, to study previous earthquakes and to account for potential future ones, ground motion simulations are required. Ground motion simulation techniques offer an alternative means of generating region-specific time-series data for locations with limited seismic networks or regions with seismic data gaps, facilitating the study of potential catastrophic earthquakes. In this research, a local ground motion model (GMM) for Turkey is developed using region-specific simulated records, thus constructing a homogeneous data set. The simulations employ the stochastic finite-fault approach and utilize validated input-model parameters in distinct regions, namely Afyon, Erzincan, Duzce, Istanbul and Van. To overcome the limitations of linear regression-based models, artificial neural network is used to establish the form of equations and coefficients. The predictive input parameters encompass fault mechanism (FM), focal depth (FD), moment magnitude (Mw), Joyner and Boore distance (RJB) and average shear wave velocity in the top 30 m (Vs30). The data set comprises 7359 records with Mw ranging between 5.0 and 7.5 and RJB ranging from 0 to 272 km. The results are presented in terms of spectral ordinates within the period range of 0.03–2.0 s, as well as peak ground acceleration and peak ground velocity. The quantification of the GMM uncertainty is achieved through the analysis of residuals, enabling insights into inter- and intra-event uncertainties. The simulation results and the effectiveness of the model are verified by comparing the predicted values of ground motion parameters with the observed values recorded during previous events in the region. The results demonstrate the efficacy of the proposed model in simulating physical phenomena.

Karimzadeh, Shaghayegh (ORCID:0000000337531676)↗
DOE OSTI2022

AmeriFlux FLUXNET-1F CA-TP3 Ontario - Turkey Point 1974 Plantation White Pine

This is the AmeriFlux Management Project (AMP) created FLUXNET-1F version of the carbon flux data for the site CA-TP3 Ontario - Turkey Point 1974 Plantation White Pine. This is the FLUXNET version of the carbon flux data for the site CA-TP3 Ontario - Turkey Point 1974 Plantation White Pine produced by applying the standard ONEFlux (1F) software. Site Description - White pine plantation established in 1974 over sandy abandoned land

Arain, M. Altaf↗
DOE OSTI2022

AmeriFlux FLUXNET-1F CA-TPD Ontario - Turkey Point Mature Deciduous

This is the AmeriFlux Management Project (AMP) created FLUXNET-1F version of the carbon flux data for the site CA-TPD Ontario - Turkey Point Mature Deciduous. This is the FLUXNET version of the carbon flux data for the site CA-TPD Ontario - Turkey Point Mature Deciduous produced by applying the standard ONEFlux (1F) software. Site Description - The forest is approximately 90 years old. Naturally regenerated on sandy terrain and abandoned agricultural land. Predominantly hardwood species with a few scattered conifers. Site has been managed (thinned) in the past. It has a high biodiversity with 573 tree and plant species, 102 bird species, 23 mamal species and 22 reptile and amphibian species (SWALSREP Report, 1999). The dominant tree species is white oak (Quercus alba), with other scattered broadleaf Carolinian species including sugar and red maple (Acer saccharum, A. rubrum), American beech (Fagus grandifolia), black and red oak (Q. velutina, Q. rubra) and white ash (Fraxinus americana) . There are also scattered conifers, mostly white and red pine (Pinus strobes, P. resinosa), comprising about 5% of the trees. Average tree height is 25.7 m with a stand density of 504 ± 18 trees per hectare. Average tree diameter at breast height is 22.3 cm and basal area is 0.06 m2 or approximately 29 square meters per hectare.

Arain, M. Altaf↗
DOE OSTI2023

AmeriFlux FLUXNET-1F CA-TP1 Ontario - Turkey Point 2002 Plantation White Pine

This is the AmeriFlux Management Project (AMP) created FLUXNET-1F version of the carbon flux data for the site CA-TP1 Ontario - Turkey Point 2002 Plantation White Pine. This is the FLUXNET version of the carbon flux data for the site CA-TP1 Ontario - Turkey Point 2002 Plantation White Pine produced by applying the standard ONEFlux (1F) software. Site Description - Plantation established in 2002 on a former sandy agricultural field, which was abandoned three years prior to planting

Arain, M. Altaf↗
DOE OSTI2025

AmeriFlux CA-TPA Ontario Turkey Point Observatory Agricultural Site

This is the AmeriFlux version of the carbon flux data for the site CA-TPA Ontario Turkey Point Observatory Agricultural Site. Site Description - This agricultural flux tower site is located about 15 km southwest of Simcoe in southern Ontario, Canada. It was planted with corn (Zea mays) in 2020 and 2021, sweet potato (Ipomoea batatas) in 2022 and tobacco (Nicotiana tabacum) in 2023. The site is part of Turkey Point Environmental Observatory (TPEO). The establishment of the agricultural site has allowed TPEO to become representative of the major biomes in the Great Lakes region, encompassing coniferous and deciduous forests, as well as agricultural crops. The soil at this agricultural site is well-drained fine sandy loam. The area has a humid continental climate and has one of the longest-growing seasons in Canada with at least 150–160 frost-free days in a year.

Arain, M. Altaf [McMaster University]↗
DOE OSTI2026

AmeriFlux FLUXNET-1F CA-TP2 Ontario - Turkey Point 1989 Plantation White Pine

This is the AmeriFlux Management Project (AMP) created FLUXNET-1F version of the carbon flux data for the site CA-TP2 Ontario - Turkey Point 1989 Plantation White Pine. This is the FLUXNET version of the carbon flux data for the site CA-TP2 Ontario - Turkey Point 1989 Plantation White Pine produced by applying the standard ONEFlux (1F) software. Site Description - Plantation established in 1989 over sandy agriculture land

Arain, M. Altaf [McMaster University]↗
DOE OSTI2026

AmeriFlux FLUXNET-1F CA-TP4 Ontario - Turkey Point 1939 Plantation White Pine

This is the AmeriFlux Management Project (AMP) created FLUXNET-1F version of the carbon flux data for the site CA-TP4 Ontario - Turkey Point 1939 Plantation White Pine. This is the FLUXNET version of the carbon flux data for the site CA-TP4 Ontario - Turkey Point 1939 Plantation White Pine produced by applying the standard ONEFlux (1F) software. Site Description - White pine plantation established in 1939 over sandy abandoned land

Arain, M. Altaf [McMaster University]↗
DOE OSTI2019

137 Cs Body-Burden in Wild Turkeys at the Savannah River Site

The Hunter Dose Tracking System (HDTS) [1], created by the Savannah River National Laboratory (SRNL) in support of wildlife hunts at the Savannah River Site (SRS), was used to measure 137Cs in turkeys harvested during hunts in April of 2017 and 2018 and a special hunt conducted by the Savannah River Ecology Laboratory (SREL) in late April and early May of 2018. The seventy turkeys shot during these five events were harvested from 27 of the 50 unique hunt compartments at SRS. These 27 hunt compartments cover more than 50% of the area of the site and include both clean and radiologically contaminated (such as the Pond B dam) areas.

63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTAN↗
NASA NTRS1994

Informatics in Turkey

In the last twenty years the rapid change in the informatics sector has had economic and social impact on private and government activities. The Supreme Council for Science and Technology of Turkey assigned highest priority to the informatics in its meeting in February 1993. With this advice TUBITAK (The Scientific and Technical Research Council of Turkey) intends to give a strong impulse to development of a research policy in this field.

Cakir, Serhat↗
NASA NTRS2012

Small Glacier Area Studies: A New Approach for Turkey

Many regions of Earth have glaciers that have been neglected for study because they are small. We report on a new approach to overcome the problem of studying small glaciers, using Turkey as an example. Prior to our study, no reliable estimates of Turkish glaciers existed because of a lack of systematic mapping, difficulty in using Landsat data collected before 1982, snowpack vs. glacier ice differentiation using existing satellite data and aerial photography, the previous high cost of Landsat images, and a lack of high-resolution imagery of small Turkish glaciers. Since 2008, a large number of < 1 m satellite images have become available at no cost to the research community. In addition, Landsat data are now free of charge from the U.S. Geological Survey, enabling the use of multiple images. We used 174 Landsat and eight high-resolution satellite images to document the areal extent of Turkish glaciers from the 1970s to 2007-2011. Multiple Landsat images, primarily Thematic Mapper (TM) data from 1984 to 2011, enabled us to minimize differentiation problems between snow and glacier ice, a potential source of error. In addition, we used Ikonos, Quickbird, and World View-1 & -2 very high-resolution imagery to evaluate our TM accuracies and determine the area of nine smaller glaciers in Turkey. We also used five Landsat-3 Return Beam Videcon (RBV) 30 m pixel resolution images, all from 1980, for six glaciers. The total area of Turkish glaciers decreased from 23 km2 in the 1970s to 10.1 km2 in 2007-2011. By 2007-2011, six Turkish glaciers disappeared, four were < 0.3 km2, and only three were 1.0 km2 or larger. No trends in precipitation from 1970 to 2006 and cloud cover from 1980 to 2010 were found, while surface temperatures increased, with summer minimum temperatures showing the greatest increase. We conclude that increased surface temperatures during the summer were responsible for the 56% recession of Turkish glaciers from the 1970s to 2006-2011.

Yavasli, Dogukan D.↗
NASA NTRS1923

The "Turkey Buzzard" glider

The "Turkey Buzzard" is a semi-internally braced monoplane (Fig. 1). The wing is placed above the fuselage for two important aerodynamical reasons: first, because this position minimizes the mutual interference between the wing and the fuselage, and, second, useful lifting surface is utilized with the wing passing over the fuselage instead of through it.

GLIDERS↗
NASA NTRS1992

Extracellular vesicles of calcifying turkey leg tendon characterized by immunocytochemistry and high voltage electron microscopic tomography and 3-D graphic image reconstruction

To gain insight into the structure and possible function of extracellular vesicles in certain calcifying vertebrate tissues, normally mineralizing leg tendons from the domestic turkey, Meleagris gallopavo, have been studied in two separate investigations, one concerning the electron microscopic immunolocalization of the 66 kDa phosphoprotein, osteopontin, and the other detailing the organization and distribution of mineral crystals associated with the vesicles as determined by high voltage microscopic tomography and 3-D graphic image reconstruction. Immunolabeling shows that osteopontin is related to extracellular vesicles of the tendon in the sense that its initial presence appears coincident with the development of mineral associated with the vesicle loci. By high voltage electron microscopy and 3-D imaging techniques, mineral crystals are found to consist of small irregularly shaped particles somewhat randomly oriented throughout individual vesicles sites. Their appearance is different from that found for the mineral observed within calcifying tendon collagen, and their 3-D disposition is not regularly ordered. Possible spatial and temporal relationships of vesicles, osteopontin, mineral, and collagen are being examined further by these approaches.

NASA Discipline Musculoskeletal↗
DOE OSTI2019

Challenging Geographical Disadvantages and Social Exclusion: A Case Study of Gendered Rural Transformation in Mountain Villages in the Western Black Sea Region of Turkey

Abstract This article discusses the gender‐specific effect of the changing economic structure of mountain villages in Turkey. Rural women, who are conventionally unpaid family workers, have begun entering into off‐farm work due to declining household incomes in recent years. The implications of this for gender relations are found to be contradictory in much recent research. In this study, we employed the concepts of the hybridity of rural communities and the multiplicity of social exclusion in a globalising countryside. We used a qualitative methodology employing multiple sources of data. In addition to in‐depth interviews with 27 village women, we conducted semi‐structured interviews with village headmen and structured interviews with 218 village women to understand the structural context behind the women’s narratives. We found that the dimension of social exclusion varies with gender and age within the community. While middle‐aged men are increasingly unemployed and have withdrawn into uncompetitive rural life, young women engage in wage work and challenge geographical disadvantages by spending their meagre earnings on transportation and communication technologies. The reconfiguration of marginality within the community, rather than the total marginalisation of villagers, is an ongoing process.

Suzuki Him, Miki↗
DOE OSTI2019

Validation of Gamma Dose Rate Calculation Methodology using the Morris and Turkey Point Measurements

The ability to accurately predict the dose rates from the spent nuclear fuel assembly is very important for determining whether the used nuclear fuel is self-guarded and self-protected. Studies have shown that the direct numerical calculations of the dose rates gave a much lower value than a typical reference. This report summarizes the benchmark studies performed to evaluate the numerical methodologies used in calculating the gamma dose rates of the spent nuclear fuel assemblies. The Morris and Turkey Point experimental data for dose rates measured through air were used in the analyses. Numerical simulations of the gamma dose rate measurements included the fuel depletion analysis of the fuel assembly as well as its structural materials irradiated inside the reactor core, the radioisotopes decay, and photon transport simulations to calculate the gamma dose rates. The different factors which affect the calculated gamma dose rates were addressed. The calculated results were compared with the measured gamma dose rates. Good agreement was obtained when the detectors were placed at the middle of the fuel assembly region. The deviations of the calculated dose rates became larger when the measurements were performed at the top or bottom fuel assemblies. In these benchmark studies, the spent nuclear fuel assemblies were all PWR assemblies and had fuel burnup around 25 MWd/kg to 40 MWd/kg. Its cooling time before the measurements was around 1.8 years to 7 years. The used nuclear fuel assembly is usually self-protected while discharged from the core. Its radioactivity decreases and after a few tens of years it may fall down below the current threshold of 100 r/h. Future validation work is necessary in order to better evaluate the numerically calculated gamma dose rates with experiments performed for other types of fuel assemblies and for fuel assemblies with higher burnup and/or longer cooling times.

73 NUCLEAR PHYSICS AND RADIATION PHYSICS↗
DOE OSTI2024

Benchmark Calculation for Turkey Point Unit 3 Cycles 1-3 Using the SCALE 6.3/Polaris–PARCS v3.4.2 Code Package

Benchmark calculations were performed for Turkey Point Unit 3 cycles 1–3 to validate the SCALE 6.3/Polaris–PARCS v3.4.2 code with the ENDF/B–VII.1 56–group library by comparing the simulated results with the measured data. The benchmark results will be used in evaluating the SCALE/Polaris–PARCS code package’s uncertainties for pressurized water reactor physics analysis. That future analysis will include key nuclear parameters such as reactivity, control bank worth, temperature coefficients, and pin and assembly power peaking factors. The present document details plant and fuel design specifications and input data for SCALE/Polaris, GenPMAXS, and PARCS. Additional details are provided with respect to the input and output files produced for the benchmark calculations. The benchmark results are summarized such that they can be used in evaluating uncertainties with other benchmark results for key nuclear parameters.

22 GENERAL STUDIES OF NUCLEAR REACTORS↗
NASA NTRS1974

Tibial bone mineral distribution as influenced by calcium, phosphorus, and vitamin D feeding levels in the growing turkey

Roentgen signs, subperiosteal, endosteal, and trabecular bone growth are evaluated in turkeys fed phosphorus at the 0.5, 0.56, 0.68, 0.90, and 2.70 percent levels. Calcium levels of 0.30, 0.40, 0.60, 1.2, and 3.60 percent were also tested. Vitamin D levels of 0, 100, 300, 900 and 27,000 I.U. per day were likewise evaluated. Roentgen signs, bone mineral as measured by T-125 gamma ray absorption, and bone mineral growth patterns as shown by radiograph area projection are correlated with calcium, phosphorus, and vitamin D feeding levels. Differences in bone growth at the various feeding levels were observed which were not reflected by differences in other studied parameters.

Spurrell, F. A.↗