Sample records for valk tnu lehtsaar
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A comment on Baxter condition for commutativity of transfer matrices
DOE Office of Scientific and Technical Information (OSTI.GOV)
Gutkin, E.
1986-07-01
Let T..nu.. and T'..nu.. be the transfer matrices of two vertex models corresponding to two sets of Boltzmann weights. The Baxter condition on Boltzmann weights was known to be sufficient for commutativity of T..nu.. and T'..nu.. for all ..nu... We show that generically it is also necessary.
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Ethylene formation by dehydration of ethanol over medium pore zeolites
NASA Astrophysics Data System (ADS)
Gołąbek, Kinga; Tarach, Karolina A.; Filek, Urszula; Góra-Marek, Kinga
2018-03-01
In this work, the role of pore arrangement of 10-ring zeolites ZSM-5, TNU-9 and IM-5 on their catalytic properties in ethanol transformation were investigated. Among all the studied catalysts, the zeolite IM-5, characterized by limited 3-dimensionality, presented the highest conversion of ethanol and the highest yields of diethyl ether (DEE) and ethylene. The least active and selective to ethylene and C3 + products was zeolite TNU-9 with the largest cavities formed on the intersection of 10-ring channels. The catalysts varied, however, in lifetime, and their deactivation followed the order: IM-5 > TNU-9 > ZSM-5. The processes taking place in the microporous zeolite environment were tracked by IR spectroscopy and analysed by the 2D correlation analysis (2D COS) allowing for an insight into the nature of chemisorbed adducts and transition products of the reaction. The cage dimension was found as a decisive factor influencing the tendency for coke deposition, herein identified as polymethylated benzenes, mainly 1,2,4-trimethyl-benzene.
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Ethylene formation by dehydration of ethanol over medium pore zeolites.
Gołąbek, Kinga; Tarach, Karolina A; Filek, Urszula; Góra-Marek, Kinga
2018-03-05
In this work, the role of pore arrangement of 10-ring zeolites ZSM-5, TNU-9 and IM-5 on their catalytic properties in ethanol transformation were investigated. Among all the studied catalysts, the zeolite IM-5, characterized by limited 3-dimensionality, presented the highest conversion of ethanol and the highest yields of diethyl ether (DEE) and ethylene. The least active and selective to ethylene and C 3+ products was zeolite TNU-9 with the largest cavities formed on the intersection of 10-ring channels. The catalysts varied, however, in lifetime, and their deactivation followed the order: IM-5>TNU-9>ZSM-5. The processes taking place in the microporous zeolite environment were tracked by IR spectroscopy and analysed by the 2D correlation analysis (2D COS) allowing for an insight into the nature of chemisorbed adducts and transition products of the reaction. The cage dimension was found as a decisive factor influencing the tendency for coke deposition, herein identified as polymethylated benzenes, mainly 1,2,4-trimethyl-benzene. Copyright © 2017 Elsevier B.V. All rights reserved.
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Omonode, Rex A.; Halvorson, Ardell D.; Gagnon, Bernard; Vyn, Tony J.
2017-01-01
Few studies have assessed the common, yet unproven, hypothesis that an increase of plant nitrogen (N) uptake and/or recovery efficiency (NRE) will reduce nitrous oxide (N2O) emission during crop production. Understanding the relationships between N2O emissions and crop N uptake and use efficiency parameters can help inform crop N management recommendations for both efficiency and environmental goals. Analyses were conducted to determine which of several commonly used crop N uptake-derived parameters related most strongly to growing season N2O emissions under varying N management practices in North American maize systems. Nitrogen uptake-derived variables included total aboveground N uptake (TNU), grain N uptake (GNU), N recovery efficiency (NRE), net N balance (NNB) in relation to GNU [NNB(GNU)] and TNU [NNB(TNU)], and surplus N (SN). The relationship between N2O and N application rate was sigmoidal with relatively small emissions for N rates <130 kg ha−1, and a sharp increase for N rates from 130 to 220 kg ha−1; on average, N2O increased linearly by about 5 g N per kg of N applied for rates up to 220 kg ha−1. Fairly strong and significant negative relationships existed between N2O and NRE when management focused on N application rate (r2 = 0.52) or rate and timing combinations (r2 = 0.65). For every percentage point increase, N2O decreased by 13 g N ha−1 in response to N rates, and by 20 g N ha−1 for NRE changes in response to rate-by-timing treatments. However, more consistent positive relationships (R2 = 0.73–0.77) existed between N2O and NNB(TNU), NNB(GNU), and SN, regardless of rate and timing of N application; on average N2O emission increased by about 5, 7, and 8 g N, respectively, per kg increase of NNB(GNU), NNB(TNU), and SN. Neither N source nor placement influenced the relationship between N2O and NRE. Overall, our analysis indicated that a careful selection of appropriate N rate applied at the right time can both increase NRE and reduce N2O
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Genetics Home Reference: cytogenetically normal acute myeloid leukemia
... on PubMed Marcucci G, Haferlach T, Döhner H. Molecular genetics of adult acute myeloid leukemia: prognostic and therapeutic ... on PubMed Sanders MA, Valk PJ. The evolving molecular genetic landscape in acute myeloid leukaemia. Curr Opin Hematol. ...
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Posttranscriptional Regulation of the Neurofibromatosis 2 Gene
2005-08-01
videomicroscopy . Neoplasia 1:31-41 Long-Sheng Chang et al. 32 232. Valk, P.J., Verhaak, R.G., Beijen, M.A., Erpelinck, C.A., Barjesteh van Waalwijk van Doorn...assessed by intravital multi-fluorescence videomicroscopy . Neoplasia. 1999; 1: 31-41. 137. Vajkoczy P, Menger MD, Goldbrunner R, et al. Targeting
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ERIC Educational Resources Information Center
He, Ming Fang; Sapp, Jeff; Botelho, Maria Jose; Nunez, Isabel; Scott-Simmons, Wynnetta; Johnson, Lincoln
2013-01-01
The theme of this column is African American Women's Memories of Racial Oppression and Segregation in the U.S. South and Its Relevance to Multicultural Education. The focus of the review is on Anne Valk and Leslie Brown's "Living with Jim Crow: African American Women and Memories of the Segregated South" (2010). In "Living with Jim…
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Physical Demands, Mental Performance and Food Components in Military Settings
2005-08-01
2004). Recently, this task showed to be sensitive for the performance enhancing effects of modafinil and caffeine (Simons et al. 2004, in press). 4.2.2...Simons, Struyvenberg et al., 1997; Valk, Van Roon, Simons, Rikken, 2004). Recently, the MAT also showed performance enhancing effects of modafinil and... Choline , a part of the B-vitamins complex, can pass the blood-brain barrier. It has however not showed any effect on cognitive functioning yet
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Assessment of Thermal Dehydration Using the Human Eye: What is the Potential?
2012-01-01
Kenefick a, Neil P. Walsh b, Matthew B. Fortes b, Marieh Esmaeelpour c,d, Samuel N. Cheuvront a,n a US Army Research Institute of Environmental Medicine...anhydrase inhibitors, which are commonly prescribed to glaucoma patients (van der Valk et al., 2005; World Heath Organization; 2009). Both types of...Deposition and thinning of the human tear film. J. Colloid Interface Sci. 184, 44–51. World Heath Organization, 2009. WHO model formulary 2008. WHO
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Transgenic Rat Models for Breast Cancer Research
1998-10-01
animals with mammary adenocarcinoma (1 out of 26 p53 null mice) whereas there was a high incidence of malignant lymphomas (20 out of 26). These studies...heir capacity to develop in utero . To this end, Dr. Warren has cultured various stages of rat embryos and 10 *~cý t. ?V& ks, 9A LA 6"r Eiac,’X4vrý...hyperplasia and adenocarcinomas in male and female mice. Cell 55: 619-625. 13. Andres, A.C., M.A. VanderValk, C.-A. Schoenenberger, F. Fluckinger, M
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Positron Emission Tomography: Principles, Technology, and Recent Developments
NASA Astrophysics Data System (ADS)
Ziegler, Sibylle I.
2005-04-01
Positron emission tomography (PET) is a nuclear medical imaging technique for quantitative measurement of physiologic parameters in vivo (an overview of principles and applications can be found in [P.E. Valk, et al., eds. Positron Emission Tomography. Basic Science and Clinical Practice. 2003, Springer: Heidelberg]), based on the detection of small amounts of posi-tron-emitter-labelled biologic molecules. Various radiotracers are available for neuro-logical, cardiological, and oncological applications in the clinic and in research proto-cols. This overview describes the basic principles, technology, and recent develop-ments in PET, followed by a section on the development of a tomograph with ava-lanche photodiodes dedicated for small animal imaging as an example of efforts in the domain of high resolution tomographs.
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Transformation of Chlorpyrifos and Chlorpyrifos-Methyl in Prairie Pothole Porewaters
NASA Astrophysics Data System (ADS)
Anderson, R. M.; Chin, Y. P.
2014-12-01
The prairie pothole region (PPR) extends over approximately 700,000 km2 in the Great Plains region in United States and Canada and is a critical breeding ground for migratory waterfowl, as well as an important ecosystem for diverse invertebrates and aquatic plants (van der Valk, 2003). Consisting of up to 12 million permanent and temporary depressional wetlands, the PPR is negatively impacted by non-point source pesticide pollution due to extensive agricultural development in the region. Recent studies have shown that high (mM) levels of sulfate in the pothole lakes are capable of abiotically reducing dinitroaniline and chloroacetanilide pesticides (Zeng, 2011; Zeng, 2012). In this study the transformation of the organophosphorus pesticide chlorpyrifos (CP) and its analog chlorpyrifos-methyl (CPM) was studied using pore waters sampled from two pothole lakes. CP and CPM have been found to react in the laboratory with sulfur species via a SN2 mechanism, with degradation by sulfur compounds occurring faster than hydrolysis at high pH (Wu, 2006). To date the reaction of CP and CPM in natural environments with sulfur species has not been studied. Chlorpyrifos-methyl underwent rapid degradation in the presence of reduced sulfur species in pore water, while chlorpyrifos degradation occurred at significantly slower rates. Both CP and CPM degradation occurred at comparable rates to what has been previously observed in the laboratory (Wu, 2006). References van der Valk, Arnold G., and Roger L. Pederson. "The SWANCC decision and its implications for prairie potholes." Wetlands 23.3 (2003): 590-596. Wu, Tong, Qiu Gan, and Urs Jans. "Nucleophilic Substitution of Phosphorothionate Ester Pesticides with Bisulfide (HS-) and Polysulfides (Sn2-)." Environmental science & technology 40.17 (2006): 5428-5434. Zeng, Teng, et al. "Pesticide processing potential in prairie pothole porewaters."Environmental science & technology 45.16 (2011): 6814-6822. Zeng, Teng, Yu-Ping Chin, and William
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DOE Office of Scientific and Technical Information (OSTI.GOV)
Xu, J.; Bugaris, D. E.; Xiao, Z. L.
We report the occurrence of reentrantmetallic behavior in theWeyl semimetal NbP. When the appliedmagnetic field H is above a critical value H-c, a reentrance appears as a peak in the temperature-dependent resistivity rho(xx) (T) at T = T-p, similar to that observed in graphite where it was attributed to local superconductivity. The Tp(H) relationship follows a power-law dependence T-p similar to (H-H-c)(1/nu) where. can be derived from the temperature dependence of the zero-field resistivity rho(0)(T) similar to T-nu. From concurrent measurements of the transverse rho(xx) (T) and Hall rho(xy)(T) magnetoresistivities, we reveal a clear correlation between the rapidly increasing rho(xy)more » (T) and the occurrence of a peak in the rho(xx) (T) curve. Quantitative analysis indicates that the reentrantmetallic behavior arises from the competition of the magnetoconductivity sigma(xx) (T) with an additional component Delta sigma(xx) (T) = kappa(H)sigma(xx)(T) where kappa(H) = [rho(xy)(T)/rho(xx)(T)](2) is the Hall factor. We find that the Hall factor (kappa(H) approximate to 0.4) at peak temperature T-p is nearly field independent, leading to the observed T-p (H) relationship. Furthermore, the reentrant metallic behavior in rho(xx) (T) also is reflected in the behavior of rho(xx) (H) that ranges from nonsaturating at T > 70K to saturation at liquid-helium temperatures. The latter can be explained with the magnetic field dependence of the Hall factor kappa(H) (H). Our paper demonstrates that a semiclassical theory can account for the "anomalies" in the magnetotransport phenomena of NbP without invoking an exotic mechanism.« less
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Effect of the different cover crops on the soil moisture in a Hungarian vineyard
NASA Astrophysics Data System (ADS)
Donkó, Ádám; Miglécz, Tamás; Valkó, Orsolya; Deák, Balázs; Kelemen, András; Török, Péter; Tóthmérész, Béla; Drexler, Dóra
2017-04-01
in 2015, at two sampling dates (April and June). During sampling the soil moisture content was measured in seven different depths per sampling point in five replicates: 10 cm, 20 cm, 30 cm, 40 cm, 50 cm, 60 cm, and 70 cm. We found significantly lower indices in case of the Lolium perenne treatment compared to the Grass-forb, and Control treatments in 40-70 cm depth. The results are in accordance with the results of previous research, that state that the use of Lolium perenne in the inter-rows can be sustainable in case of at least 7-800 mm precipitation/year, or under irrigated conditions. Among the three species-rich mixtures we have not found significant differences, but the results show that the Grass-forb mixture (with Plantago lanceolata domination) utilized the least moisture from the soil. Literature Donkó Á, Miglécz T, Valkó O, Tóthmérész B, Deák B, Kelemen A, Török P, Zanathy G, Zsigrai Gy, Drexler D (2015): Intercropping experiments in Hungarian vineyards. HUNGARIAN AGRICULTURE RESEARCH. 24 (4): pp. 31-34. (2015) Miglécz T, Valkó O, Török P, Deák B, Kelemen A, Donkó Á, Drexler D, Tóthmérész B: Establishment of three cover crop mixtures in vineyards. SCIENTIA HORTICULTURAE 197: pp. 117-123. (2015)
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Expected geoneutrino signal at JUNO
NASA Astrophysics Data System (ADS)
Strati, Virginia; Baldoncini, Marica; Callegari, Ivan; Mantovani, Fabio; McDonough, William F.; Ricci, Barbara; Xhixha, Gerti
2015-12-01
Constraints on the Earth's composition and on its radiogenic energy budget come from the detection of geoneutrinos. The Kamioka Liquid scintillator Antineutrino Detector (KamLAND) and Borexino experiments recently reported the geoneutrino flux, which reflects the amount and distribution of U and Th inside the Earth. The Jiangmen Underground Neutrino Observatory (JUNO) neutrino experiment, designed as a 20 kton liquid scintillator detector, will be built in an underground laboratory in South China about 53 km from the Yangjiang and Taishan nuclear power plants, each one having a planned thermal power of approximately 18 GW. Given the large detector mass and the intense reactor antineutrino flux, JUNO aims not only to collect high statistics antineutrino signals from reactors but also to address the challenge of discriminating the geoneutrino signal from the reactor background. The predicted geoneutrino signal at JUNO is terrestrial neutrino unit (TNU), based on the existing reference Earth model, with the dominant source of uncertainty coming from the modeling of the compositional variability in the local upper crust that surrounds (out to approximately 500 km) the detector. A special focus is dedicated to the 6° × 4° local crust surrounding the detector which is estimated to contribute for the 44% of the signal. On the basis of a worldwide reference model for reactor antineutrinos, the ratio between reactor antineutrino and geoneutrino signals in the geoneutrino energy window is estimated to be 0.7 considering reactors operating in year 2013 and reaches a value of 8.9 by adding the contribution of the future nuclear power plants. In order to extract useful information about the mantle's composition, a refinement of the abundance and distribution of U and Th in the local crust is required, with particular attention to the geochemical characterization of the accessible upper crust where 47% of the expected geoneutrino signal originates and this region contributes
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Water quality and pollution status of Chambal river in National Chambal Sanctuary, Madhya Pradesh.
Saksena, D N; Garg, R K; Rao, R J
2008-09-01
The physico-chemical characteristics of Chambal river water in National Chambal sanctuary (Madhya Pradesh) have been studied. The stretch of Chambal river contained in the National Chambal sanctuary (located at 25 degrees 23'-26 degrees 52'N, 76 degrees 28'-79 degrees 15'E) is extending up to 600 km downstream from Kota (Rajasthan) to the confluence of the Chambal with Yamuna river (Etawah). The river flow in Madhya Pradesh spans up to approximately 400 km. Three sampling stations viz., Station A--near Palighat, district Sheopurkalan, Station B--near Rajghat, district Morena and Station C--near Baraighat, district Bhind were established for the collection of water samples during April, 2003 to March, 2004. The water quality parameters namely transparency (12.12-110 cm), colour (transparent-very turbid), turbidity (1-178 TNU), electrical conductivity (145.60-884 microS cm(-1)), total dissolved solids (260-500 mgl(-1)), pH (7.60-9.33), dissolved oxygen (4.86-14.59 mgl(-1)), free carbon dioxide (0-16.5 mgl(-1)), total alkalinity (70-290 mgl(-1)), total hardness (42-140 mgl(-1)), chloride (15.62-80.94 mgl(-1)), nitrate (0.008-0.025 mgl(-1)), nitrite (0.002-0.022 mgl(-1)), sulphate (3.50-45 mgl(-1)), phosphate (0.004-0.050 mgl(-1)), silicate (2.80-13.80 mgl(-1)), biochemical oxygen demand (0.60-5.67 mgl(-1)), chemical oxygen demand (2.40-26.80 mgl(-1)), ammonia (nil-0.56 mgl(-1)), sodium (14.30-54.40 mgl(-1)) and potassium (2.10 mgl(-1)-6.30 mgl(-1)) reflects on the pristine nature of the river in National Chambal sanctuary. On the basis of various parameters studied, Chambal river in this stretch can be placed under the category of oligosaprobic. The water quality analysis, indicated that the riverwater in the sanctuary area is pollution free and can serve as a good habitat for many aquatic animals including endangered species.
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Cognitive Performance Effects of Bilastine 20 mg During 6 Hours at 8000 ft Cabin Altitude.
Valk, Pierre J L; Simons, Ries; Jetten, Andrea M; Valiente, Román; Labeaga, Luis
2016-07-01
Bilastine is a new oral, second generation antihistamine used in the symptomatic treatment of allergic rhinoconjunctivitis and urticaria. It is considered a nonsedating antihistamine and might be recommended for use in pilots, pending research on the effects on flying-related performance under hypobaric conditions that prevail in an airliner. We assessed the effects of a single dose of bilastine 20 mg on alertness and complex task performance of healthy volunteers in a hypobaric chamber at 75.2 kPa (8000 ft/2438 m cabin altitude). In a randomized, double-blind, crossover study, 24 volunteers received a single dose of bilastine 20 mg, hydroxyzine 50 mg (active control), and placebo. Using the Vigilance and Tracking Task, Multi-Attribute Task Battery, and Stanford Sleepiness Scale, assessments were made before and up to 6 h after intake of the study medication. Bilastine 20 mg had no impairing effects on sleepiness levels, vigilance, or complex task performance for up to 6 h post-dose. Hydroxyzine 50 mg (active control) was associated with significant sleepiness and impaired performance across this time period, confirming the sensitivity of the tests. Bilastine 20 mg did not cause sleepiness or impaired performance on tasks related to flying. It is anticipated that a single dose of bilastine 20 mg will not affect flying performance. Bilastine may provide a safe therapeutic alternative for pilots suffering from allergic rhinitis or urticaria. Our findings might also have implications for the treatment of allergic disorders of personnel involved in other safety-sensitive jobs. Valk PJL, Simons R, Jetten AM, Valiente R, Labeaga L. Cognitive performance effects of bilastine 20 mg during 6 hours at 8000 ft cabin altitude. Aerosp Med Hum Perform. 2016; 87(7):622-627.
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Cattle grazing and its long-term effects on sedge meadows
Middleton, Beth
2004-01-01
Most people think that wetlands are temporary, that they fill in by natural processes, and eventually become dry land. Some of these outdated ideas have come from the way that this subject has been covered in introductory textbooks in schools (Gibson, 1996). From these texts, we learned incorrectly that over time a lake fills with sediment or organic matter to become a wetland, which dries out to support shrubs and trees, and eventually it is no longer a wetland (Middleton, 1999; Middleton and others, 2004). These old ideas of how vegetation changes (succession) are no longer accepted. Wetland succession should be thought of as a cycle, with natural disturbance driving the changes, depending on the needs of the species. Succession is not something that changes a wetland into something that is not a wetland (Egler, 1978; van der Valk, 1981; Middleton and others, 1991; Klinger, 1996; Middleton, 1999).As an example of how disturbance changes wetlands, I have studied sedge meadows that have become invaded by shrubs after cattle (Bos sp.) have grazed them, in the Lodi Marsh State Natural Area, Wisconsin. Cattle disturbances allowed shrubs to invade sedge meadows, but the cattle also grazed on the shrubs, which kept them small. After the cows were removed, the plant species changed in the sedge meadow from the original sedges (fig. 1), to sedges mixed with growing small shrubs, and eventually to tall shrubs with very small amounts of sedge, called “shrub carr” (Middleton, 2002a). Even though there has been a succession of plant types, the meadows, which began as wetlands, have remained wetlands. The settlers originally found the sedge meadows to be open “sedge” lands and not shrubby. The settlers cut the sedges by hand to feed the cattle. Whitetailed deer (Odocoileus virginianus), though probably not bison (Bison bison), grazed these sedge meadows (Middleton 2002a).Subsequent studies have explored methods to control invasive shrubs to restore the biodiversity of
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Hansen, Lars Jørgen; Drivsholm, Thomas B
2002-01-28
This review should be cited as: Renders CM, Valk GD, Griffin S. Wagner EH, Eijk JThM van, Assendelft WJJ. Interventions to improve the management of diabetes mellitus in primary care, outpatient and community settings (Cochrane Review). In: The Cochrane Library, Issue 2, 2001. Oxford: Update Software. A substantive amendment to this systematic review was last made on 29 June 2000. Cochrane reviews are regularly checked and updated if necessary. Diabetes is a common chronic disease that is increasingly managed in primary care. Different systems have been proposed to manage diabetes care. To assess the effects of different interventions, targeted at health professionals or the structure in which they deliver care, on the management of patients with diabetes in primary care, outpatient and community settings. We searched the Cochrane Effective Practice and Organisation of Care Group specialised register, the Cochrane Controlled Trials Register (Issue 4 1999), MEDLINE (1966-1999), EMBASE (1980-1999), Cinahl (1982-1999), and reference lists of articles. Randomised trials (RCTs), controlled clinical trials (CCTs), controlled before and after studies (CBAs) and interrupted time series (ITS) analyses of professional, financial and organisational strategies aimed at improving care for people with Type 1 or Type 2 diabetes. The participants were health care professionals, including physicians, nurses and pharmacists. The outcomes included objectively measured health professional performance or patient outcomes, and self-report measures with known validity and reliability. Two reviewers independently extracted data and assessed study quality. Forty-one studies were included involving more than 200 practices and 48,000 patients. Twenty-seven studies were RCTs, 12 were CBAs, and two were ITS. The studies were heterogeneous in terms of interventions, participants, settings and outcomes. The methodological quality of the studies was often poor. In all studies the intervention
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Exupéry - a mobile fast response system for managing a volcanic crisis
NASA Astrophysics Data System (ADS)
Hort, M. K.
2009-12-01
analyze the incoming data (e.g. earthquake classification, rapid moment tensor inversion, deformation modeling, an automatic alert level system) which are currently under development. Exupery Working Group: Barsch R (2); Bernsdorf S (3); Beyreuther M (2); Cong X (4); Dahm T (1); Eineder M (4); Erbertseder T (4); Gerstenecker C (5); Hammer C (6); Hansteen T (7); Krieger L (1); Läufer G (5); Maerker C (4); Montalvo Garcia A (1); Ohrnberger M (6); Rix M (4); Rödelsperger S (5); Seidenberger K (4); Shirzaei M (8); Stammler K (9); Stittgen H (9); Valks P (4); Walter T (8); Wallenstein N (10); Wassermann J (2); Zakšek K (1) (1)Institute of Geophysics, Hamburg, Germany; (2) Department of Earth and Environmental Sciences, Geophysical Observatory, Munich, Germany; (3)Centauron - geosoftware & consulting, Weimar, Germany; (4)DLR Oberpfaffenhofen, Germany; (5)Institute of Physical Geodesy, Darmstadt, Germany; (6)Institute of Geosciences, Potsdam, Germany; (7) IFM-GEOMAR, Leibniz Institute of Marine Sciences, Germany; (8)Department physics of the earth, GFZ, Potsdam, Germany; (9)BGR, Geocentre Hannover, Germany; (10)CVARG, Universidade Dos Acores; Portugal