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Letteratura scientifica selezionata sul tema "Wt 100"

Autore: Grafiati

Pubblicato: 29 luglio 2024

Ultima modifica: 31 luglio 2024

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Articoli di riviste sul tema "Wt 100"

Hohage, H., C. Reinhardt, U. Borucki, G. Enck, H. Schlüter, E. Schlatter e W. Zidek. "Effects of diadenosine polyphosphates on renal function and blood pressure in anesthetized Wistar rats." Journal of the American Society of Nephrology 7, n. 8 (agosto 1996): 1216–22. http://dx.doi.org/10.1681/asn.v781216.

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In this study, the effects of diadenosine polyphosphates on kidney function were examined. Intravenous application of diadenosine hexaphosphate (AP6A) led to a significant threefold increase in both urine flow (from 2.45 +/- 0.2 to 13.8 +/- 0.74 microL/min per 100 g body wt (P < 0.05)) and Na+ excretion (from 0.41 +/- 0.12 to 1.52 +/- 0.28 mumol/min per 100 g body wt at a dose of 1.0 mg/kg body wt). In contrast, diadenosine triphosphate dose-dependently reduced urine flow (from 3.74 +/- 0.3 to 2.57 +/- 0.1 microL/min per 100 g body wt (P < 0.05)) and Na+ excretion (from 0.45 +/- 0.1 to 0.13 +/- 0.1 mumol/min per 100 g body wt at a dose of 1.0 mg/kg body wt). ATP and the P2y purinoceptor agonist gamma-S-ATP did not significantly modulate urine flow and Na+ excretion. alpha, beta-methylene-ATP, a P2x purinoceptor agonist, significantly increased urine flow from 1.74 +/- 0.5 to 4.07 +/- 1.51 microL/min per 100 g body wt, whereas Na+ excretion was unaffected. The effects were independent of alterations in GFR. Pretreatment with indomethacin (2.0 mg/kg body wt iv) completely abolished the effects of AP6A on urine flow and Na+ excretion. Similarly, pretreatment with the endothelin antagonist bosentan abolished the effects of AP6A on both urine flow and Na+ excretion, whereas suramin had no effects on the AP6A-induced increase in urine flow. In conclusion, diadenosine polyphosphates exert specific actions on urine flow and Na+ excretion that are different from the effects of ATP. AP6A may partially influence renal function by stimulating prostaglandin and endothelin release.

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Srivastav, Ajai K., L. Rani e K. Swarup. "Responses of serum calcium and phosphorus in the frog Rana tigrina to injection of various vitamin D analogs". Canadian Journal of Zoology 65, n. 8 (1 agosto 1987): 2111–12. http://dx.doi.org/10.1139/z87-323.

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Intraperitoneal injections of either vitamin D3 (4 IU/100 g body wt.), 25 hydroxyvitamin D3 (100 ng/100 g body wt.), or 1,25 dihydroxyvitamin D3 (100 ng/100 g body wt.) for 15 days induced hypercalcemia, hyperphosphatemia, and depletion of calcium deposits in the paravertebral lime sacs in an anuran, Rana tigrina.

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Acosta-Leal, Rodolfo, Becky K. Bryan, Jessica T. Smith e Charles M. Rush. "Breakdown of Host Resistance by Independent Evolutionary Lineages of Beet necrotic yellow vein virus Involves a Parallel C/U Mutation in Its p25 Gene". Phytopathology® 100, n. 2 (febbraio 2010): 127–33. http://dx.doi.org/10.1094/phyto-100-2-0127.

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Breakdown of sugar beet Rz1-mediated resistance against Beet necrotic yellow vein virus (BNYVV) infection was previously found, by reverse genetics, to be caused by a single mutation in its p25 gene. The possibility of alternative breaking mutations, however, has not been discarded. To explore the natural diversity of BNYVV in the field and its effects on overcoming Rz1, wild-type (WT) and resistance-breaking (RB) p25 genes from diverse production regions of North America were characterized. The relative titer of WT p25 was inversely correlated with disease expression in Rz1 plants from Minnesota and California. In Minnesota, the predominant WT p25 encoded the A67C68 amino acid signature whereas, in California, it encoded A67L68. In both locations, these WT signatures were associated with asymptomatic BNYVV infections of Rz1 cultivars. Further analyses of symptomatic resistant plants revealed that, in Minnesota, WT A67C68 was replaced by V67C68 whereas, in California, WT A67L68 was replaced by V67L68. Therefore, V67 was apparently critical in overcoming Rz1 in both pathosystems. The greater genetic distances between isolates from different geographic regions rather than between WT and RB from the same location indicate that the underlying C to U transition originated independently in both BNYVV lineages.

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Bassett, D. J., E. Bowen-Kelly e S. S. Reichenbaugh. "Rat lung glucose metabolism after 24 h of exposure to 100% oxygen". Journal of Applied Physiology 66, n. 2 (1 febbraio 1989): 989–96. http://dx.doi.org/10.1152/jappl.1989.66.2.989.

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Previous studies with lung homogenates and isolated cells have suggested oxygen cell injury results from the inhibition of key enzymes involved in both cytosolic and mitochondrial energy generation. In this study, the extent and pattern of metabolism of D-[U-14C, 5–3H]glucose was examined in perfused lungs isolated from rats before and after 24 h of in vivo exposure to 100% O2. Lung ATP levels after O2 exposure were maintained by a 53% increase in glucose utilization from an unexposed control value of 18.0 +/- 3.2 to 27.5 +/- 3.0 mumol 3H2O.h-1.g dry wt-1, accounted for by an enhanced rate of lactate plus pyruvate production from 15.7 +/- 2.0 to 32.7 +/- 4.1 mumol.h-1.g dry wt-1 with no alteration in lactate-to-pyruvate ratio. CO2 production was unaltered from a control rate of 27.5 +/- 4.0 14CO2 mumol.h-1.g dry wt-1. Maximal rates of glucose metabolism were determined by perfusion with 0.8 mM dinitrophenol, giving for air-exposed lungs a rate of 53.5 +/- 5.0 mumol 3H2O.h-1.g dry wt-1 and increased lactate plus pyruvate and 14CO2 production rates of 46.5 +/- 6.5 and 128.3 +/- 19.6 mumol.h-1.g dry wt-1, respectively. Although this maximal rate of glucose utilization was unaltered in oxygen-exposed lungs, lactate plus pyruvate production was further increased to 80.0 +/- 9.1 mumol.h-1.g dry wt-1 with a concomitant decrease in the dinitrophenol-induced rate of 14CO2 production to 81.5 +/- 9.2 mumol.h-1.g dry wt-1.(ABSTRACT TRUNCATED AT 250 WORDS)

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Conradie, R., W. D. Roos e H. C. Swart. "Room-temperature oxidation of Fe(100), Fe(100)-3.5 wt.% MoN and segregated MoN: a mathematical analysis". Surface and Interface Analysis 33, n. 8 (2002): 704–11. http://dx.doi.org/10.1002/sia.1437.

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Rostianbudi, Feby Y., e Frida Ulfah Ermawati. "FABRIKASI DAN KARAKTERISASI STRUKTUR DAN DENSITAS KERAMIK (Mg0,5Zn0,5)TiO3+x wt.% Bi2O3 SEBAGAI KANDIDAT MATERIAL DIELEKTRIK". Inovasi Fisika Indonesia 9, n. 2 (22 giugno 2020): 72–77. http://dx.doi.org/10.26740/ifi.v9n2.p72-77.

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AbstrakTelah dilakukan fabrikasi dan karakterisasi keramik (Mg0,5Zn0,5)TiO3 (disingkat MZT05)+x wt.% Bi2O3 (x = 0, 1, 3, 5 dan 7) yang diharapkan mampu menghasilkan keramik berbasis MgTiO3 sebagai kandidat material dielektrik. Fabrikasi keramik dilakukan dengan proses milling antara serbuk kristalin MZT05 dengan x wt.% Bi2O3 kemudian hasilnya dikompaksi pada tekanan 10 MPa dan disinter pada suhu 1000 C selama 2 jam untuk menjadi keramik MZT05+x wt.% Bi2O3. Karakterisasi struktur dengan uji XRD menunjukkan bahwa keramik MZT05+0 wt.% Bi2O3 mengandung MgTiO3 sebagai fasa utama dengan % molar = 94,23 dan sisanya TiO2 rutile. Pada komposisi 1, 3 dan 5 wt.% Bi2O3 diperoleh fasa tunggal MgTiO3 (100% molar), sedangkan pada komposisi 7 wt.% Bi2O3 hanya memberikan fasa MgTiO3 = 53,13 % molar, TiO2 rutile = 42,20 % molar dan sisanya Mg2TiO4. Karakterisasi densitas keramik MZT05+x wt.% Bi2O3 memberikan nilai-nilai yang terus meningkat seiring bertambahnya wt.% Bi2O3 dari 0–7 wt.%, yakni dari 3,57 menjadi 3,72 g/cm3. Dapat disimpulkan bahwa keramik MZT05+0, 1, 3 dan 5 wt.% Bi2O3 lebih direkomendasikan sebagai kandidat material dielektrik berbasis MgTiO3 karena memiliki kandungan MgTiO3 yang sangat tinggi (94,23 % molar untuk 0 wt.% Bi2O3 dan 100 % molar untuk 1, 3 dan 5 wt.% Bi2O3), serta memiliki densitas yang tinggi pula. Sedangkan pada komposisi 7 wt.% Bi2O3 tidak direkomendasikan karena kandungan fasa MgTiO3 menjadi sangat rendah (53,13 % molar) disertai fasa sekunder Mg2TiO4 yang berpotensi menurunkan sifat dielektrik keramik meskipun memiliki densitas yang paling tinggi. Kata Kunci: Fabrikasi keramik MZT05+x wt.% Bi2O3, struktur, densitas AbstractFabrication and characterization of (Mg0,5Zn0,5)TiO3 ceramics (abbreviated as MZT05)+x wt.% Bi2O3 (x = 0, 1, 3, 5 and 7) which is expected to be able to produce MgTiO3-based ceramics as a candidate for dielectric materials has been undertaken. The ceramic fabrication was carried out by milling process between MZT05 crystalline powder and x wt.% Bi2O3. The product was compacted at 10 MPa and sintered at 1000 C for 2 hours to obtain MZT05+x wt.% Bi2O3 ceramics. Characterization of the structure by XRD showed that MZT05+0 wt.% Bi2O3 ceramic contained MgTiO3 as the main phase with % molar = 94.23 and the remaining is rutile TiO2. The addition of 1, 3 and 5 wt.% Bi2O3 gave rise to a single phase of MgTiO3 (100 % molar), while the addition of 7 wt.% Bi2O3 resulted in MgTiO3 phase was only 53.13 % molar, rutile TiO2 = 45.20 % molar and the remaining is Mg2TiO4. Density characterization of the ceramic MZT05+x wt.% Bi2O3 provides the values that increase with increasing of wt.% Bi2O3 from 0 to 7 wt.%, which is 3.57 to 3.72 g/cm3. It can be concluded that MZT05+0, 1, 3 dan 5 wt.% Bi2O3 ceramics are more recommended as candidates for MgTiO3-based dielectric materials because they contain MgTiO3 phase (94.23 % molar for 0 wt.% Bi2O3 and 100 % molar for 1, 3 dan 5 wt.% Bi2O3) and have high densities, while the addition of 7 wt.% Bi2O3 is not recommended because the MgTiO3 content was very low (53.13 % molar), accompanied by the secondary Mg2TiO4 phase which potentially reduced the ceramic dielectric properties despite having the highest density.

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da Silva, Natan D., Aluisio Andrade-Lima, Marcel R. Chehuen, Anthony S. Leicht, Patricia C. Brum, Edilamar M. Oliveira, Nelson Wolosker, Bruno R. A. Pelozin, Tiago Fernandes e Cláudia L. M. Forjaz. "Walking Training Increases microRNA-126 Expression and Muscle Capillarization in Patients with Peripheral Artery Disease". Genes 14, n. 1 (29 dicembre 2022): 101. http://dx.doi.org/10.3390/genes14010101.

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Patients with peripheral artery disease (PAD) have reduced muscle capillary density. Walking training (WT) is recommended for PAD patients. The goal of the study was to verify whether WT promotes angiogenesis in PAD-affected muscle and to investigate the possible role of miRNA-126 and the vascular endothelium growth factor (VEGF) angiogenic pathways on this adaptation. Thirty-two men with PAD were randomly allocated to two groups: WT (n = 16, 2 sessions/week) and control (CO, n = 16). Maximal treadmill tests and gastrocnemius biopsies were performed at baseline and after 12 weeks. Histological and molecular analyses were performed by blinded researchers. Maximal walking capacity increased by 65% with WT. WT increased the gastrocnemius capillary-fiber ratio (WT = 109 ± 13 vs. 164 ± 21 and CO = 100 ± 8 vs. 106 ± 6%, p < 0.001). Muscular expression of miRNA-126 and VEGF increased with WT (WT = 101 ± 13 vs. 130 ± 5 and CO = 100 ± 14 vs. 77 ± 20%, p < 0.001; WT = 103 ± 28 vs. 153 ± 59 and CO = 100 ± 36 vs. 84 ± 41%, p = 0.001, respectively), while expression of PI3KR2 decreased (WT = 97 ± 23 vs. 75 ± 21 and CO = 100 ± 29 vs. 105 ± 39%, p = 0.021). WT promoted angiogenesis in the muscle affected by PAD, and miRNA-126 may have a role in this adaptation by inhibiting PI3KR2, enabling the progression of the VEGF signaling pathway.

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Савикин, А. П., А. С. Егоров, А. В. Будруев, И. Ю. Перунин, О. В. Крашенинникова e И. А. Гришин. "Спектральные свойства и антистоксовая люминесценция керамики и стекла TeO-=SUB=-2-=/SUB=--BaF-=SUB=-2-=/SUB=- : Ho-=SUP=-3+-=/SUP=-, Ho-=SUP=-3+-=/SUP=-/Yb-=SUP=-3+-=/SUP=- при возбуждении излучением 1.9 mum Tm : LiYF-=SUB=-4-=/SUB=--лазера". Письма в журнал технической физики 43, n. 14 (2017): 34. http://dx.doi.org/10.21883/pjtf.2017.14.44829.16771.

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Показано преобразование ИК-излучения лазера Tm : LiYF4 с длиной волны 1908 nm в видимый свет с максимумом 650 nm керамикой состава (100-x)TeO2-xBaF2-1 wt% HoF3-yYbF3, где x=20,30,40 mol.%, y=0 или 0.5 wt%. На образцах 60TeO2-40BaF2-1 wt% HoF3-0.5 wt% YbF3 наблюдалась антистоксовая люминесценция при пороговой плотности мощности излучения 1.0-1.5 W · cm-2. DOI: 10.21883/PJTF.2017.14.44829.16771

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Wu, Yuqin, Xiufang Bian, Yan Zhao, Xuelian Li, Yanning Zhang, Yongsheng Tian e Xiaoqian Lv. "Viscous behavior of (Sn61.9Pb38.1)100−xREx (, 0.1, 0.3, 1 wt%) solder alloys". Physics Letters A 372, n. 21 (maggio 2008): 3868–73. http://dx.doi.org/10.1016/j.physleta.2008.02.082.

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NAGATA, M., Y. MIZUNO, H. NOJIMA, K. SUGAWARA e M. KOBA. "ELECTRICAL TRANSPORT PROPERTIES OF Nb-DOPED SrTiO3 FABRICATED ON MgO(100) AND SrTiO3(100) SUBSTRATES BY REACTIVE EVAPORATION METHOD". Modern Physics Letters B 07, n. 08 (10 aprile 1993): 543–53. http://dx.doi.org/10.1142/s0217984993000539.

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Undoped and Nb-doped SrTiO 3 films have been fabricated on SrTiO 3(100) and MgO(100) substrates at temperatures between 500°C and 800°C by a reactive evaporation method. The single-crystallinity of these films was confirmed by X-ray diffraction and RHEED studies. Better crystallinity was obtained for films fabricated at substrate temperatures of 700°C and 800°C. Metallic behavior was found in the resistivity vs. temperature relation for all the films with Nd concentration between ~ 0.5 wt.% and ~ 5wt.%. Hall mobility measurements revealed that the carriers are electrons in all the Nb-doped films. The mobility decreases with increasing temperature for all the Nb-doped samples. The Hall mobility measurements for the highly Nb-doped (~ 5 wt.%) film revealed that a larger mobility is obtained for films grown at higher substrate temperatures.

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Tesi sul tema "Wt 100"

Gutierrez, Sanchez Juan Carlos, e Ramirez Juan Diego Ivan Salazar. "Evaluación de la permeabilidad en diseños de concreto con el uso de aditivos SIKA WT-100 y SIKA WT-200 en obras hidráulicas de Lima Metropolitana". Bachelor's thesis, Universidad Ricardo Palma, 2015. http://cybertesis.urp.edu.pe/handle/urp/1249.

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Esta tesis tiene un enfoque cuantitativo, la cual propone evaluar la influencia de la permeabilidad en diseños de concreto con el uso de aditivos Sika WT – 100 y Sika WT – 200 en obras hidráulicas de Lima Metropolitana, debido a que estas estructuras almacenan y/o conducen grandes volúmenes de agua a una velocidad determinada, y éstas al tener contacto con el agua reducen su vida útil. Los objetivos de esta tesis son determinar la profundidad de penetración de agua bajo presión bajo la Norma Europea EN 12390 – 8 y la resistencia a la compresión bajo la Norma Técnica Peruana NTP 339.034; para finalmente, determinar la permeabilidad para diseños de concreto bajo la Norma Técnica Colombiana NTC 4483. Para lograr los objetivos mencionados, se diseñó y elaboró 144 probetas cilíndricas de concreto de 10 cm de diámetro y 20 cm de altura y 48 probetas cilíndricas de concreto de 15 cm de diámetro y de altura, de las cuales fueron 64 probetas de concreto patrón (sin uso de ningún aditivo), 64 probetas de concreto con aplicación de 2% de aditivo Sika WT – 100; y 64 probetas de concreto con aplicación de 1% de aditivo Sika WT – 200. Los resultados de los diseños de concreto patrón, WT – 100 y WT – 200 con una relación agua/cemento de 0.40, con respecto a la profundidad de penetración de agua bajo presión, fueron 40, 30 y 15 mm, respectivamente. Los resultados de los diseños de concreto patrón, WT – 100 y WT – 200, con respecto a la resistencia a la compresión a los 28 días con una relación agua/cemento de 0.40, fueron 637, 621 y 632 kg/cm2, respectivamente. Según la Norma Técnica Colombiana NTC 4483 y con los resultados obtenidos, se concluye que el diseño de concreto patrón y el diseño de concreto WT – 100 alcanzan una media permeabilidad y que el diseño de concreto WT – 200 alcanza una baja permeabilidad, con una relación agua/cemento de 0.40. This thesis has a quantitative focus, that propose to evaluate the influence of permeability concrete designs with the use of admixtures Sika WT – 100 and Sika WT – 200 in Metropolitan Lima waterworks, because these structures store and lead large volumes of water at a certain speed, and when these has contact with water reduces their useful life. The objectives of this thesis are to determine the depth of penetration of water under pressure under the European Norm EN 12390-8 and compressive strength under the Peruvian Technical Norm NTP 339.034; finally, determine the permeability of concrete designs under the Colombian Technical Norm NTC 4483. To achieve these objectives, we designed and developed 144 cylindrical concrete specimens 10 cm in diameter and 20 cm high and 48 cylindrical concrete specimens 15 cm in diameter and height, which were 64 concrete specimens pattern (without use of any admixture) concrete specimens 64 with application of 2% admixture Sika WT - 100; and 64 concrete specimens with application of 1% admixture Sika WT - 200. The results of pattern, WT – 100 and WT - 200 concrete designs with a water – cement ratio of 0.40, with respect to the depth of penetration of water under pressure, were 40, 30 and 15 mm, respectively. The results of pattern, WT – 100 and WT - 200 concrete designs with a water – cement ratio of 0.40, with respect to compressive strength at 28 days, were 637, 621 and 632 kg/cm2, respectively. According to the Colombian Technical Norm NTC 4483 and the obtained results, one can conclude that the pattern concrete design and WT - 100 concrete design reach a medium permeability and concrete design WT - 200 reaches a high permeability, with a water – cement ratio of 0.40.

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Sperlich, Dennis [Verfasser]. "Search for the production of a single excited b quark in the Wt final state with a single lepton in pp collisions at sqrt s = 13 TeV with the ATLAS detector / Dennis Sperlich". Berlin : Humboldt-Universität zu Berlin, 2021. http://nbn-resolving.de/urn:nbn:de:kobv:11-110-18452/24063-4.

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Liu, Chia-Yu, e 劉家佑. "The Properties of Composite Solders of Sn-3.0 wt.% Ag- 0.5 wt.% Cu alloy Added with Sn-10.0 wt.% Cu alloy". Thesis, 2019. http://ndltd.ncl.edu.tw/handle/2q7d46.

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Chan, Kun-Chieh, e 詹琨傑. "Thermal behavior, microstructure and mechanical property of the Bi-2.5 Ag added with 1.0 wt. % In, Sb and Sn". Thesis, 2017. http://ndltd.ncl.edu.tw/handle/62905362341607289756.

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碩士
國立中央大學
機械工程學系在職專班
105
The motivation of this thesis is to modify the solder joints strength issue when Bi-2.5Ag soldered with Cu pad of ball grid array (BGA) with addition of 1.0 wt.% In, Sb and Sn. Subsequently the melting behavior, microstructure, interface microstructure and mechanical properties of ternary alloys have been discussed. The thermal analysis shown that, Bi-2.5Ag has a endothermic reaction at 262.2 ℃. After adding of 1.0 wt.% In and Sn, low temperature Bi-In phase (109.5 ℃) and Bi-Sn phase (138.8 ℃) are appeared separately. However after adding of 1.0wt.% Sb, the melting point is increased about 1.1℃ to 263.3℃. The microstructure of Bi-2.5Ag-1.0X (X=In, Sb, Sn) with Cu pad after multiple reflows shown that, there are no intermetallic compound (IMC) found at Bi-2.5Ag and Bi-2.5Ag-1.0 In joints. For Bi-2.5Ag-1.0Sn and Bi-2.5Ag-1.0 Sb, band-like Cu3Sn and band-like Cu2Sb are found at the interface of the joints. The solder joints strength had been tested by ball shear test, the result shown that after adding 1.0 wt.% In, Sb and Sn, the shear force and stability had been increased. The order of shear force (from high to low) is Bi-2.5Ag-1.0In (2.0±0.12mN) > Bi-2.5Ag-1.0Sn (1.7±0.18mN) > Bi-2.5 Ag-1.0Sb (1.5±0.13mN) > Bi-2.5Ag (1.4±0.24mN). Comparing the result of 1 time reflow and 5 time reflow, the Sb and Sn addition ternary alloys shown significant enhance, the shear force had been increased 40% and 35% separately.

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Chou, Yu-Cheng, e 周宇正. "The study of spinodal decomposition and ordering reaction in a hyper-eutectoid steel with a 1.0 wt% carbon content". Thesis, 2018. http://ndltd.ncl.edu.tw/handle/e779g5.

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碩士
國立臺灣科技大學
機械工程系
106
High carbon steel has high strength, hardness, elastic limit and fatigue limit after proper heat treatment, and is suitable for tool steel. Phase transformations play an important role on the high carbon steel. We have studied the phase transformations of a high-carbon steel with 1.0 wt.% C. The methodology for the processes of the steel includes heating the steel samples to high temperature, 1000℃, and cooling to room temperature via furnace cooling, air cooling, water quenching and liquid nitrogen quenching. We have discovered similar curves showing significant magnetic weight gain at the vicinity of 485℃from the M-TGA measurement for the steel with different heat treatment. We have also found specific phase transformation occurring at temperature near 485℃ by applying the synchrotron radiation with in-situ heating. After examination of the phase transformations of the steel after various heat treatment by TEM, we have concluded that ferrite phase has undergone unknown phase transformations during cooling. Upon cooling from high temperature, ferrite has undergone the spinodal decomposition and decomposes into two other low temperature ferrite phases. One is carbon-free ferrite (α’), and the other is carbon-contained ferrite (α”). The spinodal decomposition is as follows. α→α’+α”.The ordering reaction occurs at temperature below 485°C and the ” phase transforms into new precipitate, i.e. α” → new precipitate. The overall reactions occur in the ferrite during cooling are as follow. α→α’+α”→α’ + new precipitate

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Libri sul tema "Wt 100"

C, Brocklehurst J., Tallis Raymond e Fillit Howard, a cura di. Textbook of geriatric medicine and gerontology. 4^a ed. Edinburgh: Churchill Livingstone, 1992.

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S, Rai G., e Mulley Graham P, a cura di. Elderly medicine: A training guide. 2^a ed. Edinburgh: Churchill Livingstone/Elsevier, 2007.

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1936-, Hazzard William R., e Halter Jeffrey B, a cura di. Hazzard's geriatric medicine and gerontology. 6^a ed. New York: McGraw-Hill Medical Pub. Division, 2009.

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C, Chop Walter, e Robnett Regula H, a cura di. Gerontology for the health care professional. 2^a ed. Sudbury, MA: Jones and Bartlett Publishers, 2010.

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J, Ham Richard, a cura di. Primary care geriatrics: A case-based approach. 5^a ed. Philadelphia, Pa: Mosby Elsevier, 2007.

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G, Ouslander Joseph, e Abrass Itamar B, a cura di. Essentials of clinical geriatrics. 3^a ed. New York: McGraw-Hill, Inc., Health Professions Division, 1994.

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G, Ouslander Joseph, e Abrass Itamar B, a cura di. Essentials of clinical geriatrics. 4^a ed. New York: McGraw-Hill, Health Professions Division, 1999.

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G, Ouslander Joseph, e Abrass Itamar B, a cura di. Essentials of clinical geriatrics. 5^a ed. New York: McGraw-Hill, 2004.

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A, Parks Jennifer, e Waymack Mark H, a cura di. Ethics, aging, and society: The critical turn. New York, NY: Springer Pub. Co., 2011.

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Current Diagnosis and Treatment: Geriatrics 2E. McGraw-Hill Education / Medical, 2014.

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Capitoli di libri sul tema "Wt 100"

Wie-Addo, G., A. H. Jones, S. Palmer, V. Starinieri, J. Renshaw e P. A. Bingham. "Reformulating Ceramic Body Composition to Improve Energy Efficiency in Brick Manufacture". In Springer Proceedings in Energy, 257–68. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-63916-7_32.

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AbstractThe influence of inorganic minerals (colemanite and nepheline syenite) as additives for sustainable clay brick manufacture has been examined. Each additive was added at 4 wt% to 96 wt% brick clay and samples were fired to 950 °C and 1040 °C and then compared with samples of 100% brick clay. Multiple analytical techniques (X-ray fluorescence, dilatometry, boiling water absorption, volumetric shrinkage, and mercury porosimetry) were used for analysis. Dilatometry shows that the additives influenced the temperature at which shrinkage began and the extent of that shrinkage. The use of colemanite reduced the temperature at which the shrinkage began by 120 °C and nepheline syenite reduced it by 20 °C. A linear shrinkage in dilatometry of 1% (from the maximum expanded length) was achieved at 1000 °C for 100% clay, 875 °C for colemanite additions and 970 °C for nepheline syenite additions. However, for samples fired at 1040 °C for 2 h colemanite containing samples had significantly lower volumetric shrinkage and higher water absorption than 100% clay and nepheline syenite samples, suggesting the presence of higher amounts of open porosity caused by the decomposition of the colemanite on heating. Samples containing nepheline syenite had a lower volumetric shrinkage but also a marginally lower water absorption than the 100% clay. The further optimisation of these or similar additives could potentially provide energy saving opportunities and reductions in CO2 emissions for brick manufacturers.

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Prudnikov, V., A. Granovsky, M. Prudnikova e H. R. Khan. "Resistivity, Magnetoresistance and Hall Effect in Co(100-x) (CuO)x(10≤ x≤ 70 wt.%) Composites". In Itinerant Electron Magnetism: Fluctuation Effects, 353–62. Dordrecht: Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-011-5080-4_22.

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Calvert, Leanne. "“I Am Friends Wt You & Do Entertain No Malice”: Discord, Disputes and Defamation in Ulster Presbyterian Church Courts, c. 1700–1838". In Law and Religion in Ireland, 1700-1970, 185–209. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-74373-4_8.

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Yang, Wonseok, Young-Ok Yoon, Shae K. Kim, Hyun Kyu Lim e Do Hyang Kim. "Effects of Heat Treatment on Bio-Corrosion Properties of Mg-Zn-xMn (x= 0.5, 1.0, and 1.5 wt.%) Alloys as Biodegradable Materials". In Magnesium Technology 2015, 407–11. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-48185-2_76.

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dos Santos, T. C., P. A. Carísio, A. P. S. Martins, M. D. M. Paiva, F. M. P. Gomes, O. A. M. Reales e R. D. Toledo Filho. "Effect of Fine Aggregates and Test Settings on the Self-sensing Response of Cement-Based Composites with Carbon Nanotubes as Conductive Filler". In Lecture Notes in Civil Engineering, 197–211. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-3330-3_21.

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AbstractCement-based self-sensing composites with carbon nanotubes (CNT) have attracted attention due to their multifunctional properties and great potential for their application in the smart monitoring of concrete structures. In this study, the self-sensing properties of one paste and three mortars containing 0.50 and 0.75 wt% of CNT, and 1.5 and 1.0 sand/cement ratio were investigated, aiming to evaluate their impact on the piezoresistive response of the composites. The inclusion of sand in the cement paste with CNT led to a reduced gauge factor and a higher electrical noise response. The inert aggregates modified the compressive loading mechanical response of the composites and possibly acted as barriers to electronic mobility, by increasing the CNT conductive paths’ tortuosity or even interrupting them. The mortar containing 0.50% of CNT showed a higher electrical resistivity and, at the same time, greater sensitivity and a more linear self-sensing response than the one with 0.75% CNT, which can be explained by the CNT content being closer to its percolation threshold in the first. In this way, a lower CNT concentration generated a conductive network with a higher capacity to be rearranged under loading, generating significant changes in resistivity, but a higher CNT concentration presented a more stable and conductive network. The results suggested that both the conductive and non-conductive phases affect the detection performance of the composites and, therefore, must be dosed appropriately. Additionally, the test setup modifications positively affected the self-sensing response signal, which is particularly useful to reduce the deleterious effects of the sand additions in the matrix. This overall approach can make the use of self-sensing mortars in structural monitoring a viable option.

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Chizoo, Esonye. "Alkali Homogeneous Catalyzed Methyl Ester Synthesis from Chrysophyllum albidum Seed Oil: An Irreversible Consecutive Mechanism Approach". In Alkaline Chemistry and Applications. IntechOpen, 2022. http://dx.doi.org/10.5772/intechopen.95519.

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This chapter considers the application of alkaline (NaOH) based catalyzed methanolysis of seed oil from Chrysophyllum albidum (African star apple) as a viable route for synthesis of methyl esters (biodiesel). Specific consideration was given to the chemical kinetics and thermodynamics of the irreversible consecutive mechanism of the process on the basis of higher application of methanol/molar ratio (>3:1) as a feasible approach for generating required data for commercial scale-up of the process. The application of power rate law revealed that second order model was the best fitted model on the 328 K, 333 K and 338 K temperature and 0–100 min ranges studied. Rate constants of the glyceride hydrolysis were 0.00710, 0.00870 and 0.00910 wt% min−1 for the triglyceride (TG), 0.02390, 0.03040 and 0.03210 wt% min−1 for the diglycerides (DG) and 0.01600, 0.03710 and 0.04090 wt% min−1 for the monoglycerides (MG) at the above respective temperatures. The activation energies were 2.707, 7.30 and 23.33 kcal/mol respectively. TG hydrolysis to DG was the rate determining step. Rates of reactions were found to increase with increase temperature and mixing rate (200, 400 and 800 rpm). No optimal mixing rate was detected and the highest mixing rate of 800 rpm was the most favorable in the mixing range under investigation. The possible reason for the absence of lag period is formation of methyl esters, which acted as a solvent for the reactants, and consequently, made the reaction mixture a homogeneous single phase. The quality of the produced methyl esters were found to compare with international standards. All the results lead to more diverse and novel applications of the seed oil in biodiesel productions.

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Kharrat, Ahmed, Karim Gasmi, Mohamed Ben Messaoud, Nacéra Benamrane e Mohamed Abid. "Medical Image Classification Using an Optimal Feature Extraction Algorithm and a Supervised Classifier Technique". In Advances in Abstract Intelligence and Soft Computing, 43–56. IGI Global, 2013. http://dx.doi.org/10.4018/978-1-4666-2651-5.ch004.

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A new approach for automated diagnosis and classification of Magnetic Resonance (MR) human brain images is proposed. The proposed method uses Wavelets Transform (WT) as input module to Genetic Algorithm (GA) and Support Vector Machine (SVM). It segregates MR brain images into normal and abnormal. This contribution employs genetic algorithm for feature selection which requires much lighter computational burden in comparison with Sequential Floating Backward Selection (SFBS) and Sequential Floating Forward Selection (SFFS) methods. A percentage reduction rate of 88.63% is achieved. An excellent classification rate of 100% could be achieved using the support vector machine. The observed results are significantly better than the results reported in a previous research work employing Wavelet Transform and Support Vector Machine.

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Seto, Takayuki, Yu Yamato, Ryota Sekine e Eiji Izawa. "Chapter 26: Geology of the Hishikari Gold Deposit, Kagoshima, Japan". In Geology of the World’s Major Gold Deposits and Provinces, 545–58. Society of Economic Geologists, 2020. http://dx.doi.org/10.5382/sp.23.26.

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Abstract The bonanza-grade, low-sulfidation epithermal Hishikari gold deposit is located in the Plio-Pleistocene volcanic area of southern Kyushu, Japan. The concealed veins were discovered in 1981 and the mine has since produced 5.462 million metric tons (Mt) of ore averaging 44.3 g/t Au (242 t Au) from 1985 to the end of 2018, at which time reserves were 7.98 Mt at 20.9 g/t Au. The Hishikari deposit consists of the Honko, Sanjin, and Yamada ore zones, which occur in a NE-trending area 2.8 km long and 1.0 km wide. The veins are hosted by basement sedimentary rocks of the Cretaceous Shimanto Supergroup and by overlying Hishikari Lower Andesites of Pleistocene age. Sinter occurs about 100 m above the Yamada ore zone. Temperature-controlled hydrothermal alteration zones occupy an area of >5 km long and 2 km wide. The Honko and Sanjin veins occur within a chlorite-illite alteration zone (paleotemperature >230°C), whereas the Yamada veins occur within an interstratified clay mineral zone (150°–230°C). The marginal alteration comprises quartz-smectite (100°–150°C) and cristobalite-smectite (<100°C) zones. Ore-grade veins are located between –60- and 120-m elev, with the paleowater table over the Honko-Sanjim veins at ~300-m elev. Overall, the Ag/Au wt ratio is about 0.6. Vein-forming minerals consist of quartz, adularia, and clay minerals plus truscottite, with electrum and minor pyrite, chalcopyrite, naumannite, galena, and sphalerite. The major veins formed from repeated episodes of boiling and strong fluid flow inferred from bands of quartz, adularia, and smectite with bladed quartz, columnar adularia, and truscottite.

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Sriwichai, Kittikorn, Chantana Simtrakankul, Ratapong Onjun, Pichapop Paewpolsong e Sayan Kaennakham. "On the Wavelet Convolution Neural Networks for Ultra-Sound Based Breast Cancer Detection". In Fuzzy Systems and Data Mining IX. IOS Press, 2023. http://dx.doi.org/10.3233/faia231010.

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Breast cancer is one of the deadliest types of cancer, and it comes in a wide variety of forms, resulting in a wide variety of detection methods. Several deep learning techniques have been applied to decrease unnecessary biopsies and lessen the burden on radiologists. One of the most popular architectures for this task is the Convolutional Neural Networks (CNNs). This paper aims to explore the integration of convolutional neural networks (CNN) and wavelet transform (WT) to identify the optimal combination and architecture of these methods for efficient detection of breast cancer in ultrasound images. To accomplish this task, the wavelet convolutional neural network (WCNN) structures are proposed and trained for the mission of screening breast cancer abnormalities embedded in ultrasound type of images. Compared with other two popular networks, ResNet50 and MobileNetV2, it has been found that the proposed WCNN has produced a satisfactory solution, with an accuracy of 98.24%, precision of 97.29%, recall of 100%, and F measure of 98.24%.

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Banerjee, Sudip, Suswagata Poria, Goutam Sutradhar e Prasanta Sahoo. "Optimization of Tribological Behavior of Mg-Wc Nanocomposites at Elevated Temperature". In Research Anthology on Synthesis, Characterization, and Applications of Nanomaterials, 1135–52. IGI Global, 2021. http://dx.doi.org/10.4018/978-1-7998-8591-7.ch046.

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The present investigation scrutinizes the role of wt.% of WC (0, 0.5, 1, 1.5 and 2%), operating temperature (50, 100, 150, 200 and 250°C) and load (20, 30 and 40N) on wear rate and coefficient of friction (COF) of Mg-WC nanocomposites. A multilevel full factorial design is considered to optimize the response variables. Mg-WC nanocomposites are synthesized through ultrasonic vibration assisted stir casting method. Tribological tests are performed in a pin-on-disk tribotester at dry sliding condition. Optical microscope and scanning electron microscope (SEM) are used to visualize the microstructural phases and distribution of reinforcements respectively. Main effect plots and interaction plots are analyzed to find the effect of selected parameters and their interactions. Analysis of variance (ANOVA) is also carried out for response variables to find the significant parameters. Linear regression equations are also generated to relate the output and input parameters. Worn surfaces are studied with the help of SEM images to examine the wear mechanisms.

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Atti di convegni sul tema "Wt 100"

Smiljanic, M. M., Z. Lazic, E. Milinkovic, K. Cvetanovic e M. Rasljic Rafajilovic. "A Simple Concave Corner Compensation of Etched Si(100) in 25 wt % TMAH Water Solution". In 2021 IEEE 32nd International Conference on Microelectronics (MIEL). IEEE, 2021. http://dx.doi.org/10.1109/miel52794.2021.9569186.

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Łatka, L., L. Pawłowski, A. Cattini, A. Denoirjean, D. Chicot, S. Kozerski e F. Petit. "Mechanical Properties of Yttria and Ceria Stabilized Zirconia Coatings Obtained by Suspension Plasma Spraying". In ITSC 2012, a cura di R. S. Lima, A. Agarwal, M. M. Hyland, Y. C. Lau, C. J. Li, A. McDonald e F. L. Toma. ASM International, 2012. http://dx.doi.org/10.31399/asm.cp.itsc2012p0805.

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Abstract Plasma generated by an SG-100 torch was applied to spray suspension formulated with the use of ZrO2+8 wt% Y2O3 (8YSZ) and ZrO2+24 wt% CeO2+2.5 wt% Y2O3 (24CeYSZ) as solid phases. The solids have the mean size of about 4.5 µm for 8YSZ and 3.9 µm 24CeYSZ and were obtained by milling of commercial powders Metco 204 NS and Metco 205NS, respectively. The suspensions were formulated with the use of 20 wt% solid phase, 40 wt% water, and 40 wt.% ethanol. The plasma spray parameters were optimized by keeping constant: (i) the electric power at 40 kW (ii) the working gases composition 45 slpm of Ar and 5 slpm of H2. On the other hand, the spray distance was varied from 40 to 60 mm and torch linear speed was varied from 300 to 500 mm/s. The coatings were sprayed onto stainless steel substrates to reach the thickness ranging from 70 to 110 µm (8YSZ) and about 70 µm (24CeYSZ). The coating microstructures were analyzed with the use of a scanning electron microscope. Mechanical properties were tested with the use of indentation and scratch tests. The indentation test was carried out with various loads ranging from 100 to 10,000 mN to determine elastic modulus and Martens microhardness. Young’s modulus of the coatings was in the range 71 to 107 GPa for 8YSZ and 68 to 130 GPa for 24CeYSZ. Scratch tests were conducted to determine the scratch macrohardness.

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Anelli, Ettore, Andrea Di Schino, Alfonzo Izquierdo, Hector Quintanilla, Giuseppe Cumino e Marco Tivelli. "Seamless Pipes of High Strength 100 KSI Grade". In 2006 International Pipeline Conference. ASMEDC, 2006. http://dx.doi.org/10.1115/ipc2006-10368.

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A joint industrial program (JIP), termed “Seamless 100 ksi weldable” was launched in order to address the complex design issues of high strength Q&T seamless pipes for ultra deep water applications. The JIP was split in two main phases, the first one devoted to the development and production of seamless pipes, with minimum yield strength of 90 ksi (620 MPa) to 100 ksi (690 MPa), and the second one to evaluate their field weldability. Phase I was recently completed. The role of chemical composition and Q&T process conditions on microstructure and precipitation was analyzed, together with relevant effects on strength and toughness, for both laboratory and industrial steels. The main microstructural features which control the strength-toughness combination of these high strength Q&T steel grades were identified and results were exploited for the set-up of a production route for pipelines and risers. The 100 ksi grade was achieved in 16 mm (0.630 in) and 25 mm (0.980 in) WT pipes. Phase II is in progress.

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Petorak, C. A., K. J. Bowman e R. W. Trice. "Stress-Relaxation and Creep Behavior of Heat-Treated Stand-Alone Plasma-Sprayed 7 wt.% Y2O3-ZrO2 Coatings". In ITSC2005, a cura di E. Lugscheider. Verlag für Schweißen und verwandte Verfahren DVS-Verlag GmbH, 2005. http://dx.doi.org/10.31399/asm.cp.itsc2005p0765.

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Abstract Plasma-sprayed 7 wt.% Y2O3-ZrO2 (YSZ) stand-alone coatings were subjected to 10, 50 and 100-hr heat treatments at 1200°C, followed by mechanical testing in compression at 25°C, 1050°C, and 1200°C. The mechanical tests performed on the samples included cyclic loading/ unloading, stress-relaxation, and creep. In cyclic compression tests at 25°C, it was observed that the YSZ coating that had been heat-treated for 50-hr at 1200°C demonstrated a higher modulus and more strain hysteresis as compared to an as-sprayed sample. As heat-treatment time increased, the YSZ stand-alone coating demonstrated less relaxation of the initial applied stress for stress-relaxation tests run at 1050°C and 1200°C. The steady-state creep rate was observed to decrease with increasing heat-treatment time prior to testing; as expected, the steady-state creep rate increases when the testing temperature was increased from 1050°C to 1200°C. Density (via Archimedes’) and phase analysis (via X-ray diffraction) were performed on YSZ coatings before (i.e. as-sprayed) and after heat-treating at 1200°C. Porosity was observed to decrease only slightly (~1%) after a 100-hr heat-treatment at 1200°C as compared to the as sprayed porosity. The high-yttria metastable tetragonal phase observed in the as-sprayed coatings was observed after a 100-hr heat-treatment at 1200°C. The same metastable tetragonal phase was also observed after a 100-hr heat-treatment at 1200°C followed by a 3-hr stress-relaxation test at 1200°C.

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Rathika, R., S. Johnson Jeyakumar, M. Kovendhan, D. Paul Joseph, C. Venkateswaran e K. Asokan. "Study of 100 MeV O7+ ion beam irradiation effects on spray deposited 5 wt% ‘Li’ doped MoO3 thin film". In DAE SOLID STATE PHYSICS SYMPOSIUM 2019. AIP Publishing, 2020. http://dx.doi.org/10.1063/5.0017591.

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Kovendhan, M., D. Paul Joseph, P. Manimuthu, K. Vijayarangamuthu, K. Asokan, C. Venkateswaran e R. Mohan. "100 MeV O7+ irradiation induced red shift in the band gaps of 3 wt% 'Li' doped Nb2O5 thin film". In SOLID STATE PHYSICS: Proceedings of the 58th DAE Solid State Physics Symposium 2013. AIP Publishing LLC, 2014. http://dx.doi.org/10.1063/1.4872796.

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Kawahara, Akimaro, Michio Sadatomi, Kazuya Okayama e Masahiro Kawaji. "Effects of Liquid Properties on Pressure Drop of Two-Phase Gas-Liquid Flows Through a Microchannel". In ASME 2003 1st International Conference on Microchannels and Minichannels. ASMEDC, 2003. http://dx.doi.org/10.1115/icmm2003-1058.

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Adiabatic experiments were conducted to measure pressure drop for single-phase liquid and gas-liquid two-phase flows through a circular microchannel with an internal diameter of 100 μm. In order to study the effects of liquid properties on the pressure drop, aqueous solutions of ethanol with different mass concentrations (4.8, 9.5, 49 and 100 wt%) in distilled water and distilled water were used as the working liquid, while nitrogen gas was used for the gas phase. The surface tension of the working liquid ranged from 0.023 N/m (100 wt% ethanol) to 0.072 N/m (water), and viscosity from 0.9 mPa·s (water) to 3.4 mPa·s (49 wt% ethanol aqueous solution). For the single-phase flow experiments, the friction factor data were obtained for each working liquid used, over a Reynolds number range of 2 < Re < 800. For the two-phase flow experiments, pressure drop data were collected over 0.2 < jG < 7 m/s for the superficial gas velocity and 0.1 < jL < 1 m/s for the superficial liquid velocity. For single-phase flows, friction factor data were shown to be in reasonable agreement with conventional theory. Furthermore, early transition from laminar to turbulent flow was not observed over the present experimental flow conditions. For two-phase flows, Lockhart & Martinelli’s correlation was found to be capable of predicting the present pressure drop data irrespective of the working liquid tested, if an appropriate constant needed in the correlation is adopted.

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Stefanovsky, Sergey, Alexander Kobelev, Vladimir Lebedev, Oleg Knyazev, Michael Polkanov e James Marra. "Cold Crucible Vitrification of SRS SB4 Waste at High Waste Loadings". In ASME 2009 12th International Conference on Environmental Remediation and Radioactive Waste Management. ASMEDC, 2009. http://dx.doi.org/10.1115/icem2009-16197.

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The test on determination of maximized waste loading was performed at the Radon bench-scale facility equipped with a 236 mm inner diameter cold crucible. Waste surrogate was vitrified using a commercially available Frit 503-R4 (in wt.%: 8 Li2O, 16 B2O3, 76 SiO2). Waste loading ranged between ∼45 and 70 wt.%. Viscosity of the melt with 50 wt.% waste loading remained lower that 100 Poise (maximum value for glass melting) even at temperatures below 1300 °C. Electric resistivity value for this glass allowed electric melting at temperatures of 1100–1150 °C and higher. Melt viscosity increased with the increase of waste loading and glass with 60 wt.% waste loading had appropriate viscosity for melting at temperatures over 1350 °C. This glass was much “shorter” than the glass with 50 wt.% waste loading. Its electric resistivity at the same temperature was higher than that of glass with 50 wt.% waste loading and allowed this glass to be produced at temperatures 1250 °C and lower, but the high viscosity was a restricting factor and this glass required temperatures ∼ 1400 °C and over to be produced. The melt with 70 wt.% waste loading was too inhomogeneous and viscous and its viscosity and electric resistivity could not be measured precisely. As a result the glasses with 70 and 60 wt.% waste loadings required melting temperature as high as 1350–1400 °C whereas the glass with 50 wt.% waste loading may be produced at 1150–1250 °C. Wet slurry (∼50 and ∼70 wt.% water content) in the amount of 625.1 kg was processed and glass in the amount of 186.6 kg was produced and poured into 12 canisters for 91 hrs. Average slurry feed rate, glass productivity and specific glass productivity were 6.86 kg/hr, 2.16 kg/hr, and 68.8 kg/(m2xhr) respectively.

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Akchurin, Aydar, Songbo Xu, X. W. Tangpong, Tian Liu, Weston Wood e Wei-Hong Zhong. "Nanoscale Characterization of Wear Particles Produced From CNF-Reinforced HDPE Composites". In ASME 2012 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/imece2012-86149.

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Wear debris of materials used nowadays in orthopedic replacements is known to be the major cause of failures in a long-term period. Recent studies showed that the autoimmune reaction to the foreign body is not only the consequence of the material itself, but also depends on the size and shape of the wear particles. In this paper, carbon nanofiber (CNF) reinforced high density polyethylene (HDPE) debris particles were characterized both quantitatively and morphologically. Various weight concentrations (0.5 wt.%, 1 wt.% and 3 wt.%) and silane coating thicknesses (2.8 nm and 46nm) of CNFs in the nanocomposites were investigated. Wear tests were provided by a pin-on-disk tribometer with phosphate buffered saline as the lubricant. The wear debris was collected, isolated and characterized by scanning electron microscopy (SEM) at high magnifications and also by dynamic light scattering (DLS) particle sizing. The DLS measurements were in general consistent with the SEM observations. Small sphere-shaped wear particles of various diameters (predominantly less than 100 nm) were observed on the SEM images for all materials. The particles’ diameter distributions obtained by the DLS technique also showed that the mean diameters of the majority of the particles were mostly less than 100 nm. No correlation was found between the morphology, as well as the size distributions, of the debris particles and CNF concentrations or silane coating thickness in these experiments.

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Penniston, Christopher, Laurie Collins e Fathi Hamad. "Effects of Ti, C and N on Weld HAZ Toughness of High Strength Line Pipe". In 2008 7th International Pipeline Conference. ASMEDC, 2008. http://dx.doi.org/10.1115/ipc2008-64134.

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As pipeline construction projects seek to implement more efficient welding techniques in order to reduce construction costs, it is important to understand the factors that affect the tolerance of the steel to welding processes. This is particularly true in the case of welding high strength steels (X70 and greater) in which increased alloy content will promote the formation of low temperature phases with limited ductility in the heat affected zone (HAZ). In the present study, the effects of titanium (0.008 to 0.015 wt%), nitrogen (60 to 100 ppm) and carbon (0.035 versus 0.060 wt%) have been examined through welds produced by a robotic gas metal arc welder.

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Rapporti di organizzazioni sul tema "Wt 100"

Wilkins, Justin, Andrew McQueen, Joshua LeMonte e Burton Suedel. Initial survey of microplastics in bottom sediments from United States waterways. Engineer Research and Development Center (U.S.), settembre 2021. http://dx.doi.org/10.21079/11681/42021.

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Given the reported extent of microplastics in the aquatic environment, environmentally relevant exposure information for sediments dredged by the US Army Corps of Engineers will lend context to the risks posed by this contaminant during dredging. We measured the occurrence, abundance, and polymer composition of microplastics in sediments collected from nine dredged waterways and two non-dredged reference areas. The number of particles in sediment samples ranged from 162 to 6110 particles/kg dry wt., with a mean of 1636 particles/kg dry wt. Fragments were the most prevalent shape observed among the 11 study sites (100% frequency of occurrence), followed by fibers (81%), spheres (75%), foams (38%) and films (34%). Based on analyses of chemical composition of the particles using Fourier transform infrared spectroscopy, polyethylene:propylene was the most common polymer type observed. Consistent with results presented by other investigators microplastic concentrations and polymer types in bottom sediments in this study were also aligned with the most widely used plastics worldwide.

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Desbarats, A. J., e J. B. Percival. Hydrogeochemistry of mine tailings from a carbonatite-hosted Nb-REE deposit, Oka, Quebec, Canada. Natural Resources Canada/CMSS/Information Management, 2023. http://dx.doi.org/10.4095/331256.

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Environmental impacts associated with the mining of carbonatite deposits are an emerging concern due to the demand for critical metals. This study investigates the chemistry of tailings seepage at the former Saint Lawrence Columbium mine near Oka, Québec, Canada, which produced pyrochlore concentrate and ferroniobium from a carbonatite-hosted Nb-REE deposit. Its objectives are to characterize the mineralogy of the tailings and their pore water and effluent chemistries. Geochemical mass balance modeling, constrained by aqueous speciation modeling and mineralogy, is then used to identify reactions controlling the chemical evolution of pore water along its flow path through the tailings impoundment. The tailings are composed mainly of REE-enriched calcite (82 wt. %), biotite (12 wt. %) and fluorapatite (4 wt. %). Minor minerals include chlorite, pyrite, sphalerite, molybdenite and unrecovered pyrochlore. Secondary minerals include gypsum, barite and strontianite. Within the unsaturated zone, pore water chemistry is controlled by sulfide oxidation and calcite dissolution with acid neutralization. With increasing depth below the water table, pore water composition reflects gypsum dissolution followed by sulfate reduction and FeS precipitation driven by the oxidation of organic carbon in the tailings. Concomitantly, incongruent dissolution of biotite and chlorite releases K, Mg, Fe, Mn, Ba and F, forming kaolinite and Ca-smectite. Cation exchange reactions further remove Ca from solution, increasing concentrations of Na and K. Fluoride concentrations reach 23 mg/L and 8 mg/L in tailings pore water and effluent, respectively. At a pH of 8.3, Mo is highly mobile and reaches an average concentration of 83 µg/L in tailings effluent. Although U also forms mobile complexes, concentrations do not exceed 16 µg/L due to the low solubility of its pyrochlore host. Adsorption and the low solubility of pyrochlore limit concentrations of Nb to less than 49 µg/L. Cerium, from calcite dissolution, is strongly adsorbed although it reaches concentrations (unfiltered) in excess of 1 mg/L and 100 µg/L in pore water and effluent, respectively. Mine tailings from carbonatite deposits are enriched in a variety of incompatible elements with mineral hosts of varying reactivity. Some of these elements, such as F and Mo, may represent contaminants of concern because of their mobility in alkaline tailings waters.

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Padget, C. D. W., D. R. M. Pattison, D. P. Moynihan e O. Beyssac. Pyrite and pyrrhotite in a prograde metamorphic sequence, Hyland River region, SE Yukon: implications for orogenic gold. Natural Resources Canada/CMSS/Information Management, 2021. http://dx.doi.org/10.4095/328987.

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Abstract (sommario):

The distribution of pyrite and pyrrhotite is documented within an andalusite-sillimanite type (high-temperature, low-pressure) metasedimentary succession exposed in the Hyland River region of southeastern Yukon, Canada. The following metamorphic zones are recognized: chlorite, biotite, cordierite/staurolite (porphyroblast-in), andalusite, sillimanite, and K-feldspar + sillimanite. Pyrite occurs in the chlorite zone through the biotite zone, while pyrrhotite occurs from the chlorite zone to K-feldspar + sillimanite zone. The pyrite-pyrrhotite transition, therefore, occupies an interval in the chlorite and lower biotite zones that is terminated upgrade by a pyrite-out isograd in the upper part of the biotite zone or lowest grade part of the cordierite/staurolite zone. Pressure and temperature conditions of the rocks were estimated from phase equilibrium modelling and from Raman spectroscopy of carbonaceous material (RSCM) thermometry. Modelling indicates pressures of 3.7-4.1 kbar with temperatures of ~425 °C at the biotite isograd, 560-570 °C for chlorite-out/porphyroblast-in, ~575 °C for andalusite-in, 575-600 °C for the sillimanite isograd, and 645-660 °C at the K-feldspar + sillimanite isograd. RSCM temperatures are greater than or equal to 420 °C in the Chl zone, 500 °C at the Bt isograd, 525-550 °C for porphyroblast-in isograd, ~550 °C at the And isograd, and 580 °C at the Sil isograd. These results suggest the pyrite-pyrrhotite transition occurs from less than or equal to 420°C to ~560 °C. Thermodynamic modelling shows 0.6 wt. % H2O is released during metamorphism over the ~140 °C interval of the pyrite-pyrrhotite transition. The gradual release of fluid in the biotite zone is interpreted to have broadened the pyrite-pyrrhotite transition compared to other studies that predict a small interval of vigorous fluid release associated with volumetric chlorite consumption. Samples from the pyrite-pyrrhotite transition zone contain lower whole rock and pyrite Au values than samples from unmetamorphosed/lower rocks, suggesting that Au was removed from the rock at conditions below the pyrite-pyrrhotite transition (&lt;420 °C). The chlorite zone and higher-grade metamorphic rocks of the Hyland River area do not appear to be a plausible source region for orogenic gold.

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