bluuebunny/crossref_metadata_2025_split huggingface dataset:
Multiphase Mo-Si-B alloys processed by directional solidification
Authors: Krüger Manja , Hasemann Georg , Bogomol Iurii , Loboda Petr I. 
Published: February 2013

ABSTRACTMultiphase Mo-Si-B alloys are potential candidates for applications in the aerospace and power generation industry due to their enhanced creep and oxidation resistance at ultra-high temperatures. It is documented that the microstructure and the resulting properties of Mo-based alloys are heavily influenced by their fabrication procedure. In this study we investigate different multiphase Mo-Si-B alloys processed by zone melting (ZM) starting from cold pressed elemental powders. Microstructural characterization of zone melted alloys based on SEM investigations shows elongated arrangements of phases parallel to the growing direction as well as homogeneously distributed phases in the cross-section for some of the alloys investigated. First compression creep tests were performed at about 1100°C. In comparison to the creep resistance of powder metallurgically (PM) processed alloys the behaviour of ZM materials was found to be substantially improved. Hence, targeted application temperatures of around 1200°C to 1300°C may become feasible. Furthermore, the oxidation behaviour was found to be influenced by the volume fraction of the Mo solid solution phase since the volatilization of the Mo solid solution phase leads to a mass loss of the compound.
Some Experiments on Sorption Behavior of Iodide ions into CSH Gel under the Condition Saturated with Saline Groundwater
Authors: Niibori Yuichi , Funabashi Taihei , Mimura Hitoshi 
Published: February 2013

ABSTRACTThe main hydrate of cement is calcium silicate hydrate (CSH). Such a cement-based material is essential for constructing the geological disposal system of TRU radioactive wastes including I-129 in Japan. So far, the sorption behavior of iodine on CSH gel has been examined by using the CSH samples dried once. However, the Japan’s repository would be constructed under water table. Therefore, we must focus on also the interaction of altered cementitious material and iodine under the condition saturated with saline groundwater.In this study, the sorption behavior of iodide ions into CSH gel, formed without dried processes, was examined in imitated saline groundwater. Ca/Si ratio was set to 0.4, 0.8, 1.2 and 1.6, and NaCl concentration of each sample also was set to 0.6 M, 0.06 M or 0.006 M. These samples were synthesized with CaO, SiO2 (fumed silica), and distilled water in a given combination of 20 ml/g in liquid/solid ratio. A NaI solution was added after curing the CSH gel (hereinafter referred to as the “Surface sorption sample”) for 7 days, setting the initial concentration of NaI to 0.5 mM in sample tube. The values of Eh and pH of each sample showed iodide ions as the chemical species of iodine in the sample tube. Furthermore, this study prepared the “Co-precipitation sample” of CSH gel with iodide ions. Here, the NaI solution was added before curing the CSH gel. For all samples, the contact time-period of the CSH gel with iodide ions was set to 7 days. After each contact time-period, each sample for analyses was separated into the solid and the liquid phases by 0.20 µm membrane filter. In the liquid phase, the concentrations of Ca, I, Si and Na ions in the liquid phase were measured by ICP-AES. Besides, the Raman spectra were obtained from the solid phases of the surface sorption sample and the co-precipitation sample without dried process.The results showed that the sorption of iodide ions into CSH gel strongly depends on the amount of water included in the CSH gel. Such a sorption behavior was confirmed in both co-precipitation samples and the surface sorption samples, even if the Ca/Si ratio is low. This means that iodide ions can be easily immobilized through the water-molecular of CSH gel. Besides, Na concentration did not so much affect the sorption behavior of iodide ions into CSH gel. In addition, the Raman spectra showed that the degree of polymerization of SiO4 tetrahedrons in CSH gel was unaffected with increasing Na ions concentration. These results suggest that the CSH gel saturated with groundwater would retard the migration of iodide ions, even if the groundwater includes salinity.
Copper Doped ZnO Thin Film for Ultraviolet Photodetector with Enhanced Photosensitivity
Authors: Rajan Akshta , Arora Kashima , Yadav Harish Kumar , Gupta Vinay , Tomar Monika 
Published: February 2013

ABSTRACTUltraviolet photoconductivity in Copper doped ZnO (Cu:ZnO) thin films synthesized by sol-gel technique is investigated. Response characteristics of Pure ZnO thin film and Cu:ZnO thin film UV photodetector with 1.3 at. wt % Cu doping biased at 5 V for UV radiation of λ = 365 nm and intensity = 24 µwatt/cm2 has been studied. Cu:ZnO UV photodetector is found to exhibit a high photocoductive gain (K = 1.5×104) with fast recovery (T90% = 23s) in comparison to pure ZnO thin film based photodetector (K = 4.9×101 and T90% = 41s). Cu2+ ions have been substituted in ZnO lattice which has been confirmed by X-ray diffraction (XRD) and Raman spectroscopy leading to lowering of dark current (Ioff ∼ 1.44 nA). Upon UV illumination, more electron hole pairs are generated in the photodetector due to the high porosity and roughness of the surface of the film which favours adsorption of more oxygen on the surface of the photodetector. The photogenerated holes recombined with the trapped electrons, increasing the concentration of photogenerated electrons in the conduction band enhancing the photocurrent (Ion ∼ 0.02 mA) of the Cu:ZnO photodetector.
Structural and Electro-Optical Properties of CdTe Films Used in CdTe/CdS Solar Cells Grown with Substrate Configuration
Authors: Moutinho Helio R. , Romero Manuel J. , Moseley John , Dhere Ramesh G. , Jiang Chun-Sheng , Jones Kim M. , Duenow Joel N. , Al-Jassim Mowafak M. 
Published: February 2013

ABSTRACTIn this work, we study CdTe thin films used in CdTe/CdS solar cells with a substrate configuration, which allows for better control in forming the junction, and the possibility for using flexible non-transparent substrates. We studied the properties of CdTe films grown at 450° and 550°C, with and without a CuxTe layer, and before and after CdCl2 treatment. We analyzed the structural and electro-optical properties using electron backscatter diffraction (EBSD), cathodoluminescence (CL) and X-ray diffraction (XRD), and investigated how the film structure, stress, and defect structure changes with the different growth conditions.
The Science, Technology, and Implementation of TiAl Alloys in Commercial Aircraft Engines
Authors: Bewlay B. P. , Weimer M. , Kelly T. , Suzuki A. , Subramanian P.R. 
Published: February 2013

ABSTRACTThe present article will describe the science and technology of titanium aluminide (TiAl) alloys and the engineering development of TiAl for commercial aircraft engine applications. The GEnxTM engine is the first commercial aircraft engine that is flying titanium aluminide (alloy 4822) blades and it represents a major advance in propulsion efficiency, realizing a 20% reduction in fuel consumption, a 50% reduction in noise, and an 80% reduction in NOx emissions compared with prior engines in its class. The GEnxTM uses the latest materials and design processes to reduce weight, improve performance, and reduce maintenance costs.GE’s TiAl low-pressure turbine blade production status will be discussed along with the history of implementation. In 2006, GE began to explore near net shape casting as an alternative to the initial overstock conventional gravity casting plus machining approach. To date, more than 40,000 TiAl low-pressure turbine blades have been manufactured for the GEnxTM 1B (Boeing 787) and the GEnxTM 2B (Boeing 747-8) applications. The implementation of TiAl in other GE and non-GE engines will also be discussed.
Growth of 130 μm Thick Epitaxial KNbO3Film by Hydrothermal Method
Authors: Shiraishi T. , Einishi H. , Ishikawa M. , Hasegawa T. , Kurosawa M. , Funakubo H. 
Published: February 2013

ABSTRACTKNbO3thick films were deposited on (100)cSrRuO3//(100)SrTiO3substrates at 240 °C for 3 h by hydrothermal method. Film thickness increased linearly with increasing the deposition number of times and 130 μm thickness was achieved by the 6 time deposition. XRD analysis showed the growth of epitaxial orthorhombic films with the mixture orientation of (100), (010) and (001). Cross-sectional SEM observation showed that the 130 μm-thick film was dense and no obvious voids inside the film. In addition, the crystal structure change along film thickness direction was not detected from the cross-sectional Raman spectral observation.
Fructose-Enhanced Efficacy of Magnetic Nanoparticles against Antibiotic Resistant Biofilms
Authors: Durmus N. Gozde , Taylor Erik N. , Webster Thomas J. 
Published: February 2013

ABSTRACTThe emergence of methicillin-resistantStaphylococcus aureus(MRSA) is a major cause of hospital-acquired infections (HAI). HAI affect approximately 1.7 million patients each year in the U.S., resulting in up to 100,000 excess deaths, which leads to an estimated cost of more than $35 billion per year. Hence, there is an urgent clinical need to develop new therapies to reduce infections, without resorting to the use of antibiotics for which bacteria are developing a resistance towards. In this study, we designed superparamagnetic iron-oxide nanoparticles (SPION) to treat antibiotic-resistant biofilms and showed that SPION efficacy increases when they are used in combination with fructose.
Long-term Corrosion of Zircaloy-4 and Zircaloy-2 by Continuous Hydrogen Measurement under Repository Condition
Authors: Sakuragi Tomofumi , Miyakawa Hideaki , Nishimura Tsutomu , Tateishi Tsuyoshi 
Published: February 2013

ABSTRACTCorrosion behavior is a key issue for the waste disposal of irradiated metals, such as hulls and endpieces, and is considered to be a leaching source of radionuclides including C-14. However, little information about Zircaloy corrosion in anticorrosive conditions has been provided.In the present study, long-term corrosion tests of Zircaloy-4 and Zircaloy-2 were performed in assumed disposal conditions (dilute NaOH solution, pH 12.5, 303 K) by using the gas flow system for 1500 days. The corrosion rate, which was determined by measuring gaseous hydrogen and the hydrogen absorbed in Zircaloy, decreased with immersion time and was lower than the value of 2×10−2 μm/y used in performance assessment (1500-day values: 5.84×10−3 and 5.66×10−3 μm/y for Zircaloy-4, 1000-day values: 8.81×10−3 μm/y for Zircaloy-2). The difference in corrosion behavior between Zircaloy 4 and Zircaloy-2 was negligible. The average values of the hydrogen absorption ratios for Zircaloy-4 and Zircaloy-2 during corrosion were 91% and 94%, respectively.The hydrogen generation kinetics of both gas evolution and absorption into metal can be shown by a parabolic curve. This result indicates that the diffusion process controls the Zircaloy corrosion in the early corrosion stage of the present study, and that the thickness of the oxide film in this stage is limited to approximately 25 nm and may therefore be in the form of dense tetragonal zirconia.
Assessment of the evolution of the redox conditions in the SKB ILW-LLW SFR-1 repository (Sweden)
Authors: Duro L. , Domènech C. , Grivé M. , Roman-Ross G. , Bruno J. , Källström K. 
Published: February 2013

ABSTRACTThe evaluation of the redox conditions in the Swedish ILW-LLW repository, SFR-1, is of high relevance in the performance assessment. The SFR-1 repository contains heterogeneous types of wastes, of different activity levels and with different materials in the waste and in the matrices and packaging. Steel and concrete-based materials are ubiquitous in the repository. The assessment presented in this work is based on the evaluation of the redox conditions and of the reducing capacity in 15 individual and representative waste package types in SFR-1. A combination of the individual models is used to determine the redox evolution of the different vaults in the repository. The results of the model indicate that in the initial time after repository closure, O2 is consumed through degradation of organic matter and metal corrosion during the initial time after repository closure. Afterwards, the system is kept under reducing conditions for long time periods, and H2(g) is generated due to the anoxic corrosion of steel forming magnetite as main corrosion product. The time at which steel is depleted varies with the amount and characteristics of steel and ranges from 5,000 to over 60,000 years. After complete steel corrosion, the reducing capacity of the system is mainly given by magnetite. The calculated redox potential under the chemical conditions imposed by the massive amounts of cements in the repository is in the order of -0.75 V (at pH 12.5). In case of assuming that the Eh of the system is controlled by the interaction between Fe(III)/Magnetite as a result of groundwater/magnetite interactions, redox potentials in the range -0.7 to -0.01V are calculated, considering the uncertainty in the pH prevalent in the system If the absence of oxic disturbances the Eh of the repository system would be kept reducing. In the event of oxidising and diluted glacial meltwater intrusion, magnetite would gradually convert into Fe(III) oxides, buffering the redox potential of the system and preventing it from oxidation for long time periods.
Sorption Behavior of Nickel and Palladium in the Presence of NH3(aq)/NH4+
Authors: Kobayashi Taishi , Sasaki Takayuki , Ueda Ken-you , Kitamura Akira 
Published: February 2013

ABSTRACTIt is necessary to assess the impact of nitrate salts and their reduction products (e.g. NH3(aq)/NH4+) contained in low-level radioactive waste generated from nuclear reprocessing process for the safety assessment of geological disposal of the waste. In the present study, sorption behavior of Ni and Pd on pumice tuff was investigated in the presence of NH3(aq)/NH4+. Under various NH3(aq)/NH4+ concentration, pH and ionic strength conditions, distribution coefficient (Kd) of Ni and Pd on pumice tuff was determined by a batch experiment. For Ni system, the Kd values showed no significant dependence on initial NH4+ concentration ([NH4+]ini < 1 M) in neutral pH region, which agreed with the prediction from thermodynamic data. For Pd system, the Kd values decreased with an increase of [NH4+]ini, suggesting the formation of stable ammine complexes (Pd(NH3)m2+ (m: 1 – 4)). The obtained Kd values for Ni and Pd were analyzed using a surface complexation model. By taking complexes predicted by thermodynamic data into account, sorption behavior of Ni and Pd in the presence of NH3(aq)/NH4+ were well explained.
Research and Development on Cementation of Liquid Radioactive Waste (LRW) Resulting from Spent Nuclear Fuel Reprocessing in the Experimental Demonstration Center (EDC) of Mountain Chemical Combine
Authors: Lebedeva A.V. , Sukhanov L.P. , Ustinov O.A 
Published: February 2013

ABSTRACTThe report presents the results of research and development on cementation technology of liquid radioactive waste (LRW) generated in spent nuclear fuel reprocessing in Experimental Demonstration Center (EDC) at the Mountain Chemical Combine, Russian Federation.
Classification of Genetic Variation for Drought Tolerance in Tall Fescue using Physiological Traits and Molecular Markers
Authors: Sun Jianming , Luo Hongji , Fu Jinmin , Huang Bingru 
Published: February 2013

ABSTRACTDrought stress is a major factor limiting turfgrass growth. The objectives of the study were to determine genetic variation in major physiological traits associated with drought tolerance in a collection of tall fescue (Festuca arundinacea Schreb.) germplasm and to examine genetic diversity and relationships among germplasm varying in drought tolerance via molecular marker classification. Plants of 44 accessions from Africa, Europe, America, and Australia were exposed to well‐watered conditions or drought stress by withholding irrigation for 11 d in a trial conducted in June 2009 and for 13 d during a repeated trial conducted in September 2009 in a greenhouse. Visual evaluation of turf quality, leaf relative water content, electrolyte leakage, chlorophyll content, and evapotranspiration rate demonstrated wide phenotypic variation contributing to drought tolerance in this collection of tall fescue germplasm. A hierarchical cluster analysis was conducted based on physiological traits and among 44 tall fescue accessions, 12 accessions were classified as most tolerant, 17 as moderately tolerant, and 15 as susceptible. The genetic similarity matrix from molecular marker analysis demonstrated similarity indexes ranging from 0.51 to 0.83. Among the 44 accessions, SH‐3‐AM‐US from America and PI598949‐EU‐IT from Europe were genetically distinct, but both were classified as drought‐tolerant germplasm based on physiological data. Screening genetically diverse germplasm to identify superior drought tolerance through the combined approach of physiological and molecular marker analysis could prove useful in breeding programs for further improvement of drought tolerance in tall fescue turfgrass.
Location of Genomic Regions Contributing to Phytophthora nicotianae Resistance in Tobacco Cultivar Florida 301
Authors: Xiao Bingguang , Drake Katherine , Vontimitta Vijay , Tong Zhijun , Zhang Xueting , Li Mei‐yun , Leng Xiao‐dong , Li Yongpi , Lewis Ramsey S. 
Published: February 2013

ABSTRACTBlack shank, caused by Phytophthora nicotianae, is typically the most important disease affecting tobacco (Nicotiana tabacum L.) production in the United States. Pedigree information suggests that most black shank resistance was derived from the cigar tobacco cultivar Florida 301. This resistance is thought to be polygenic in nature. The objectives of the current experiment were to (i) evaluate lines from a recombinant inbred line population derived from a cross between Florida 301 and the black shank‐susceptible cultivar Hicks for partial resistance using replicated field and greenhouse testing, (ii) genotype the population and use quantitative trait loci (QTL) analyses to identify Florida 301 genomic regions associated with resistance, and (iii) compare results with those obtained from a previous QTL analysis of a population derived from a cross involving ‘Beinhart 1000’. A total of 11 QTL affecting area under the disease progress curve were identified in both the field and greenhouse experiments. The QTL with the largest effect explained 16.9 and 18.6% of the phenotypic variation in the field and greenhouse experiments, respectively. This QTL was also found to have the largest effect on resistance in a Beinhart 1000 × Hicks doubled haploid mapping population. A major QTL found to affect resistance on linkage group 15 in the latter population, however, was not found to be important in the current population. Quantitative trait loci identification using greenhouse data was comparable to, if not superior to, use of field data.
Combining Ability and Heterosis for Grain Iron and Zinc Densities in Pearl Millet
Authors: Govindaraj M. , Rai K. N. , Shanmugasundaram P. , Dwivedi S. L. , Sahrawat K. L. , Muthaiah A. R. , Rao A. S. 
Published: February 2013

ABSTRACTPearl millet [Pennisetum glaucum (L.) R. Br.] is an important staple food crop in the semiarid tropical regions of Asia and Africa. As part of a major initiative to improve its grain Fe and Zn densities, two sets of line × tester studies were conducted. Results showed that the underlying physiological processes determining the grain Fe and Zn densities were largely under additive genetic control, and Fe and Zn densities of the inbred lines per se and their general combining ability (GCA) were positively and highly significantly correlated. This would imply that recurrent selection can be effectively used to improve the breeding populations for grain Fe and Zn densities and that breeding lines selected for high Fe and Zn densities per se are more likely to include those with high GCA for these micronutrients. Lack of better‐parent heterosis indicated that to breed hybrids with high Fe and Zn densities would require high levels of these micronutrients in both parental lines. Highly significant and positive correlations between the Fe and Zn densities, between the GCA of Fe and Zn densities, and between the specific combining ability (SCA) of the Fe and Zn densities showed that simultaneous selection for both micronutrients is likely to be effective with respect to all these performance parameters. Consistency in the patterns of results across both sets of trials and across the environments for all the parameters implies that these results could be of wider application to the genetic improvement of Fe and Zn densities in pearl millet.
Environmental implications of agriculture trade in Nepal
Authors: Pant Krishna P. 
Published: February 2013

International trade of the goods and services has implications to environment via their effects on environment on production and consumption. Agriculture being closely linked with the natural environment the trade of agricultural products and the inputs required for agriculture affects the environment. This paper attempts to identify and analyze trade issues of environmental protection that mainly falls under the purview of Agreement on Technical Barriers to Trade under the World
Trade Organization. The analyses will be helpful to identify and understand trade remedy measures that protect environment required for more sustainable agricultural development.

The Journal of AGRICULTURE AND ENVIRONMENT Vol. 8, 2007, pp. 30-37
Temporal trends in avalanche activity in the French Alps and subregions: from occurrences and runout altitudes to unsteady return periods
Authors: Eckert N. , Keylock C. J. , Castebrunet H. , Lavigne A. , Naaim M. 
Published: February 2013

AbstractWe present an analysis of temporal trends in ∼55 000 avalanches recorded between 1946 and 2010 in the French Alps and two north/south subregions. First, Bayesian hierarchical modelling is used to isolate low-, intermediate- and high-frequency trends in the mean avalanche occurrence and runout altitude per year/winter. Variables are then combined to investigate their correlation and the recent evolution of large avalanches. Comparisons are also made to climatic and flow regime covariates. The results are important for risk assessment, and the development of new high-altitude climate proxies. At the entire French Alps scale, a major change-point exists in ∼1978 at the heart of a 10 year period of high occurrences and low runout altitudes corresponding to colder and snowier winters. The differences between this change-point and the beginning/end of the study period are 0.1 avalanche occurrences per winter and per path and 55 m in runout altitude. Trends before/after are well correlated, leading to enhanced minimal altitudes for large avalanches at this time. A marked upslope retreat (80 m for the 10 year return period runout altitude) accompanied by a 12% decrease in the proportion of powder snow avalanches has occurred since then, interrupted from about 2000. The snow-depth and temperature control on these patterns seems significant (R= 0.4–0.6), but is stronger at high frequencies for occurrences, and at lower frequencies for runout altitudes. Occurrences between the northern and southern French Alps are partially coupled (R∼0.4, higher at low frequencies). In the north, the main change-point was an earlier shift in ∼1977, and winter snow depth seems to be the main control parameter. In the south, the main change-point occurred later, ∼1979–84, was more gradual, and trends are more strongly correlated with winter temperature.