Thematische Bibliographien / Lead silicate

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Auswahl der wissenschaftlichen Literatur zum Thema „Lead silicate“

Autor: Grafiati
Veröffentlicht am 25. Mai 2024

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Zeitschriftenartikel zum Thema "Lead silicate"

1

Li, Bofu, Benjamin F. Trueman, Javier M. Locsin, Yaohuan Gao, Mohammad Shahedur Rahman, Yuri Park und Graham A. Gagnon. „Impact of sodium silicate on lead release from lead(ii) carbonate“. Environmental Science: Water Research & Technology 7, Nr. 3 (2021): 599–609. http://dx.doi.org/10.1039/d0ew00886a.

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Sodium silicate has been used to control lead levels in drinking water, but there is little theoretical support for this practice. We find that sodium silicate is not effective in controlling lead release from lead(ii) carbonate.
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Dunn, Pete J. „The lead silicates from Franklin, New Jersey: occurrence and composition“. Mineralogical Magazine 49, Nr. 354 (Dezember 1985): 721–27. http://dx.doi.org/10.1180/minmag.1985.049.354.12.

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AbstractThe lead silicate minerals from Franklin, New Jersey, occurred in two separate assemblages. One of these is characterized by esperite associated with hardystonite and occasional larsenite. The second assemblage can be considered as two parts: one consists of margarosanite, barysilite, nasonite, and ganomalite; the other contains roeblingite and hancockite, together with a number of highly hydrated phases. Chemical analyses indicate that these species conform to their theoretical compositions. There are no simple lead silicates at Franklin; all are compound silicates of Pb with Mn, Zn, and Ca.
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Zhang, Z., und R. G. Reddy. „Viscosities of lead silicate slags“. Mining, Metallurgy & Exploration 19, Nr. 1 (Februar 2002): 37–42. http://dx.doi.org/10.1007/bf03402899.

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Lehman, Richard L. „Lead-Ion Stability in Soda-Lime Lead Silicate Glasses“. Journal of the American Ceramic Society 75, Nr. 8 (August 1992): 2194–99. http://dx.doi.org/10.1111/j.1151-2916.1992.tb04483.x.

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5

M. Al-Nasrawy, Dunia K. „Microstructure properties of lead silicate glasses“. Iraqi Journal of Physics (IJP) 13, Nr. 28 (04.02.2019): 91–99. http://dx.doi.org/10.30723/ijp.v13i28.246.

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In the present work, lead silicate glasses have been prepared withdifferent amount of lead oxide content. Structure properties such asX-ray diffraction, AFM, and FTIR analyses have been done. Theexceeding of PbO content more than 25wt% revealed a decreasing indensity. The X- ray revealed that the strongest peak related toHexagonal silica dioxide and the other crystal phases formed wererelated to silica oxide (SiO2) and lead oxide (PbO). Growth anddecayed phases in X-ray have been observed with changing leadoxide content. Homogeneous surface was obtained using AFManalyzer with an average diameter around 100 nm. Infrared spectrumis characterized by the presence of large absorption band between1200 and 900cm-1 and have its maximum at 1080 cm-1 which istypical to stretching vibrations of Si–O–Si bonds, another bandsnoticed were attributed to Pb–O–Pb, Pb–O–Si, [AlO4]-tetrahedron,and to Si–O–Al bond.
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Long, X. C., und S. R. J. Brueck. „Large photosensitivity in lead–silicate glasses“. Applied Physics Letters 74, Nr. 15 (12.04.1999): 2110–12. http://dx.doi.org/10.1063/1.123772.

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Wang, Pengfei, Jonathan Ward, Yong Yang, Xian Feng, Gilberto Brambilla, Gerald Farrell und Síle Nic Chormaic. „Lead-silicate glass optical microbubble resonator“. Applied Physics Letters 106, Nr. 6 (09.02.2015): 061101. http://dx.doi.org/10.1063/1.4908054.

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Stefanovskii, S. V., A. A. Minaev und F. A. Lifanov. „Lead-silicate glasses with sodium sulfate“. Glass and Ceramics 46, Nr. 4 (April 1989): 142–45. http://dx.doi.org/10.1007/bf00676457.

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9

Liu, Liping. „Infrared spectroscopy on lead silicate glass“. Zeitschrift f�r Physik B Condensed Matter 90, Nr. 4 (Dezember 1993): 393–99. http://dx.doi.org/10.1007/bf01308818.

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Crichton, S. N., und C. T. Moynihan. „Structural relaxation of lead silicate glass“. Journal of Non-Crystalline Solids 102, Nr. 1-3 (Juni 1988): 222–27. http://dx.doi.org/10.1016/0022-3093(88)90134-2.

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Dissertationen zum Thema "Lead silicate"

1

Weaver, Cameron L. „Lead silicate solubility and the control of lead contamination in drinking water“. Thesis, This resource online, 1994. http://scholar.lib.vt.edu/theses/available/etd-07112009-040433/.

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2

Ozisik, Gulsevim. „Genetical Investigation Of Balya-balikesir Lead-zinc Mineralizations“. Master's thesis, METU, 2009. http://etd.lib.metu.edu.tr/upload/3/12611319/index.pdf.

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This thesis study is concerned with genetical investigation of Balikesir Balya Pb-Zn mineralization through the mineralogic-petrographic and geochemical examination of the core samples obtained from a total of 9 holes drilled by EczacibaSi ESAN Madencilik. The Pb-Zn mineralization in Balya is mainly of vein-type. Wall rocks hosting mineralizations are dacite, dacite porphyry and microdiorite. Major types of alteration are silicification, carbonatization and calc-silicate alteration, each of which is further subdivided into early and late stages and overprinted by argillic alteration of probable supergene origin. The ore minerals are mainly Zn- and Pb-sulphides and are hosted by the rocks with late calc-silicate alteration that underwent pervasive late silicification and late carbonatization. Sulfide mineralization is spatially and temporally associated with the late silicification and carbonatization stages. Lateral-vertical correlation of drill logs suggest that thickness of the ore zone tends to decrease towards north. The volcanic rocks hosting the mineralization have calc-alkaline nature. Major, trace and rare earth element (REE) geochemistry suggests either crustal contamination or subduction signature in the mantle source of the volcanics. Multi element patterns and discrimination diagrams collectively point to a post-collisional setting for their generation. Alteration geochemistry reveals that Fe2O3 and CaO are enriched during calc-silicate alteration in contrast to depletion of SiO2. Al2O3 and TiO2 are almost constant during late calc-silicate alteration. Enrichment of Fe2O3 and Na2O, and depletion of K2O characterize the silicified zones. Carbonatization is accompanied by strong enrichment of CaO and depletion of SiO2, Al2O3 and K2O.
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Leong, Julie Yeen Yeen. „Fabrication and applications of lead-silicate glass holey fibre for 1-1.5 microns : nonlinearity and dispersion trade offs“. Thesis, University of Southampton, 2007. https://eprints.soton.ac.uk/50197/.

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This thesis describes the development of novel microstructured optical fibres (MOFs), namely holey optical fibres (HFs), based on a commercial highly nonlinear non-silica glass: By taking the advantages of the zero dispersion of the HFs at 1 μm and 1.55 μm, the SC studies are carried out using these HFs (WW HFs and SEST HFs). Both of the fibre SC studies combined experimental and numerical results, and the simulations and experiments were in qualitative agreement. We observed a spectrum spanning over 1000nm by using just ~98 pJ energy pulses in a 60cm piece of the WW HF. This demonstrated the advantage of SG-HFs in terms of compact devices and low power requirements.
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Lintereur, Phillip. „EFFECTS OF SOURCE WATER BLENDING FOLLOWING TREATMENT WITH SODIUM SILICATE AS A CORROSION INHIBITOR ON METAL RELEASE WITHIN A WAT“. Doctoral diss., University of Central Florida, 2008. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/2967.

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A study was conducted to investigate and quantify the effects of corrosion inhibitors on metal release within a pilot distribution system while varying the source water. The pilot distribution system consisted of pre-existing facilities from Taylor et al (2005). Iron, copper, and lead release data were collected during four separate phases of operation. Each phase was characterized by the particular blend ratios used during the study. A blended source water represented a water that had been derived from a consistent proportion of three different source waters. These source waters included (1) surface water treated through enhanced coagulation/sedimentation/filtration, (2) conventionally treated groundwater, and (3) finished surface water treated using reverse osmosis membranes. The corrosion inhibitors used during the study were blended orthophosphate (BOP), orthophosphate (OP), zinc orthophosphate (ZOP), and sodium silicate (Si). This document was intended to cite the findings from the study associated with corrosion treatment using various doses of sodium silicate. The doses were maintained to 3, 6, and 12 mg/L as SiO2 above the blend-dependent background silica concentration. Sources of iron release within the pilot distribution system consisted of, in the following order of entry, (1) lined cast iron, (2) un-lined cast iron, and (3) galvanized steel. Iron release data from these materials was not collected for each individual iron source. Instead, iron release data represented the measurement of iron upon exposure to the pilot distribution system in general. There was little evidence to suggest that iron release was affected by sodium silicate. Statistical modeling of iron release suggested that iron release could be described by the water quality parameters of alkalinity, chlorides, and pH. The R2 statistic implied that the model could account for only 36% of the total variation within the iron release data set (i.e. R2 = 0.36). The model implies that increases in alkalinity and pH would be expected to decrease iron release on average, while an increase in chlorides would increase iron release. The surface composition of cast iron and galvanized steel coupons were analyzed using X-ray photoelectron spectroscopy (XPS). The surface analysis located binding energies consistent with Fe2O3, Fe3O4, and FeOOH for both cast iron and galvanized steel. Elemental scans detected the presence of silicon as amorphous silica; however, there was no significant difference between scans of coupons treated with sodium silicate and coupons simply exposed to the blended source water. The predominant form of zinc found on the galvanized steel coupons was ZnO. Thermodynamic modeling of the galvanized steel system suggested that zinc release was more appropriately described by Zn5(CO3)2(OH)6. The analysis of the copper release data set suggested that treatment with sodium silicate decreased copper release during the study. On average the low, medium, and high doses decreased copper release, when compared to the original blend source water prior to sodium silicate addition, by approximately 20%, 30%, and 50%, respectively. Statistical modeling found that alkalinity, chlorides, pH, and sodium silicate dose were significant variables (R2 = 0.68). The coefficients of the model implied that increases in pH and sodium silicate dose decreased copper release, while increases in alkalinity and chlorides increased copper release. XPS for copper coupons suggested that the scale composition consisted of Cu2O, CuO, and Cu(OH)2 for both the coupons treated with sodium silicate and those exposed to the blended source water. Analysis of the silicon elemental scan detected amorphous silica on 3/5 copper coupons exposed to sodium silicate. Silicon was not detected on any of the 8 control coupons. This suggested that sodium silicate inhibitor varied the surface composition of the copper scale. The XPS results seemed to be validated by the visual differences of the copper coupons exposed to sodium silicate. Copper coupons treated with sodium silicate developed a blue-green scale, while control coupons were reddish-brown. Thermodynamic modeling was unsuccessful in identifying a controlling solid that consisted of a silicate-based cupric solid. Lead release was generally decreased when treated with sodium silicate. Many of the observations were recorded below the detection limit (1 ppb as Pb) of the instrument used to measure the lead concentration of the samples during the study. The frequency of observations below the detection limit tended to increase as the dose of sodium silicate increased. An accurate quantification of the effect of sodium silicate was complicated by the observations recorded below detection limit. If the lead concentration of a sample was below detection limit, then the observation was recorded as 1 ppb. Statistical modeling suggested that temperature, alkalinity, chlorides, pH, and sodium silicate dose were important variables associated with lead release (R2 = 0.60). The exponents of the non-linear model implied that an increase in temperature, alkalinity, and chlorides increased lead release, while an increase in pH and sodium silicate dose were associated with a decrease in lead release. XPS surface characterization of lead coupons indicated the presence of PbO, PbO2, PbCO3, and Pb3(OH)2(CO3)2. XPS also found evidence of silicate scale formation. Thermodynamic modeling did not support the possibility of a silicate-based lead controlling solid. A solubility model assuming Pb3(OH)2(CO3)2 as the controlling solid was used to evaluate lead release data from samples in which lead coupons were incubated for long stagnation times. This thermodynamic model seemed to similarly describe the lead release of samples treated with sodium silicate and samples exposed to the blended source water. The pH of each sample was similar, thus sodium silicate, rather than the corresponding increase in pH, would appear to be responsible if a difference had been observed. During the overall study, the effects of BOP, OP, ZOP, and Si corrosion inhibitors were described by empirical models. Statistically, the model represented the expected value, or mean average, function. If these models are to be used to predict a dose for copper release, then the relationship between the expected value function and the 90th percentile must be approximated. The USEPA Lead and Copper Rule (LCR) regulates total copper release at an action level of 1.3 mg/L. This action level represents a 90th percentile rather than a mean average. Evaluation of the complete copper release data set suggested that the standard deviation was proportional to the mean average of a particular treatment. This relationship was estimated using a linear model. It was found that most of the copper data sub-sets (represented by a given phase, inhibitor, and dose) could be described by a normal distribution. The information obtained from the standard deviation analysis and the normality assumption validated the use of a z-score to relate the empirical models to the estimated 90th percentile observations. Since an analysis of the normality and variance (essentially contains the same information as the standard deviation) are required to assess the assumptions associated with an ANOVA, an ANOVA was performed to directly compare the effects of the inhibitors and corresponding doses. The findings suggested that phosphate-based inhibitors were consistently more effective than sodium silicate when comparing the same treatment levels (i.e. doses). Among the phosphate-based inhibitors, the effectiveness of each respective treatment level was inconsistent (i.e. there was no clear indication that any one phosphate-based inhibitor was more effective than the other). As the doses increased for each inhibitor, the results generally suggested that there was a corresponding tendency for copper release to decrease.
Ph.D.
Department of Civil and Environmental Engineering
Engineering and Computer Science
Electrical Engineering PhD
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Roisine, Gauthier. „Céramiques glaçurées de Bernard Palissy : À la recherche des secrets d'un maître de la Renaissance“. Electronic Thesis or Diss., Paris Sciences et Lettres (ComUE), 2018. http://www.theses.fr/2018PSLEC010.

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Les céramiques glaçurées plombifères transparentes ou opalescentes de Bernard Palissy à la Renaissance constituent aujourd’hui encore des oeuvres techniquement inimitables, tant leurs procédés chimiques et thermiques restent énigmatiques. Ce projet porte sur l’étude de compositions de verres du ternaire SiO2-Al2O3-PbO auxquels Bernard Palissy a ajouté différents agents colorants ou opacifiants. Après une analyse multi-échelle fine de glaçures superficielles d’échantillons archéologiques (composition, propriétés thermomécaniques, micro-inclusions à l’interface glaçures/substrat céramique), on cherchera à les reproduire le plus précisément possible en laboratoire en jouant sur les matières premières, les conditions de traitement thermique et le support céramique. L’impact de la concentration en certains oxydes tels que Al2O3 sur la structure des verres (approche multi-spectroscopique), leur microstructure (nature, distribution des cristaux), leurs caractéristiques physiques (viscosité, coefficient de dilatation, couleur…) et l’interaction avec le substrat seront particulièrement étudiés. L’approche allie l’analyse approfondie d’un corpus archéologique et la reproduction des systèmes chimiques et des procédés thermiques. Elle permettra de connaître les indicateurs pertinents liés aux procédés innovants et aux matières premières qui permirent à Palissy d’obtenir des composites alliant la perfection mécanique (absence de fissuration, cohésion interfaciale remarquable) à celle de l’illusion réaliste. Ils permettront enfin de définir des critères d’authentification de ses oeuvres
The high-lead glazes transparent or opalescent made by Bernard Palissy during the Renaissance still constitute technically inimitable works, so their chemical and thermal processes remain enigmatic. This project involves the study of glass compositions of the ternary SiO2-Al2O3-PbO to which Bernard Palissy added various coloring agents or opacifiers. After a fine multi-scale analysis of superficial glazes of archaeological samples (composition, thermomechanical properties, the interface glazes / ceramic substrate), we will try to reproduce them as accurately as possible in the laboratory by playing on raw materials, heat treatment conditions and ceramic support. The impact of the concentration of certain oxides such as Al2O3 on the glass structure (multi-spectroscopic approach), their microstructure (nature, distribution of crystals), their physical characteristics (viscosity, coefficient of expansion, color ...) and interaction with the substrate will be particularly studied. The approach combines in-depth analysis of an archaeological corpus and the reproduction of chemical systems and thermal processes. It will enable us to know the relevant indicators linked to the innovative processes and raw materials that allowed Palissy to obtain composites combining mechanical perfection (absence of cracking, remarkable interfacial cohesion) with that of realistic illusion. Finally, they will enable us to define criteria for the authentication of his works
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MacNevin, David. „THE EFFECTS OF PHOSPHATE AND SILICATE INHIBITORS ON SURFACE ROUGHNESS AND COPPER RELEASE IN WATER DISTRIBUTION SYSTEMS“. Doctoral diss., University of Central Florida, 2008. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/3713.

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The effects of corrosion inhibitors on water quality and the distribution system were studied. This dissertation investigates the effect of inhibitors on iron surface roughness, copper surface roughness, and copper release. Corrosion inhibitors included blended poly/ortho phosphate, sodium orthophosphate, zinc orthophosphate, and sodium silicate. These inhibitors were added to a blend of surface water, groundwater, and desalinated brackish water. Surface roughness of galvanized iron, unlined cast iron, lined cast iron, and polyvinyl chloride was measured using pipe coupons exposed for three months. Roughness of each pipe coupon was measured with an optical surface profiler before and after exposure to inhibitors. For most materials, inhibitor did not have a significant effect on surface roughness; instead, the most significant factor determining the final surface roughness was the initial surface roughness. Coupons with low initial surface roughness tended to have an increase in surface roughness during exposure, and vice versa, implying that surface roughness tended to regress towards an average or equilibrium value. For unlined cast iron, increased alkalinity and increased temperature tended to correspond with increases in surface roughness. Unlined cast iron coupons receiving phosphate inhibitors were more likely to have a significant change in surface roughness, suggesting that phosphate inhibitors affect stability of iron pipe scales. Similar roughness data collected with new copper coupons showed that elevated orthophosphate, alkalinity, and temperature were all factors associated with increased copper surface roughness. The greatest increases in surface roughness were observed with copper coupons receiving phosphate inhibitors. Smaller increases were observed with copper coupons receiving silicate inhibitor or no inhibitor. With phosphate inhibitors, elevated temperature and alkalinity were associated with larger increases in surface roughness and blue-green copper (II) scales.. Otherwise a compact, dull red copper (I) scale was observed. These data suggest that phosphate inhibitor addition corresponds with changes in surface morphology, and surface composition, including the oxidation state of copper solids. The effects of corrosion inhibitors on copper surface chemistry and cuprosolvency were investigated. Most copper scales had X-ray photoelectron spectroscopy binding energies consistent with a mixture of Cu2O, CuO, Cu(OH)2, and other copper (II) salts. Orthophosphate and silica were detected on copper surfaces exposed to each inhibitor. All phosphate and silicate inhibitors reduced copper release relative to the no inhibitor treatments, keeping total copper below the 1.3 mg/L MCLG for all water quality blends. All three kinds of phosphate inhibitors, when added at 1 mg/L as P, corresponded with a 60% reduction in copper release relative to the no inhibitor control. On average, this percent reduction was consistent across varying water quality conditions in all four phases. Similarly when silicate inhibitor was added at 6 mg/L as SiO2, this corresponded with a 25-40% reduction in copper release relative to the no inhibitor control. Hence, on average, for the given inhibitors and doses, phosphate inhibitors provided more predictable control of copper release across changing water quality conditions. A plot of cupric ion concentration versus orthophosphate concentration showed a decrease in copper release consistent with mechanistic control by either cupric phosphate solubility or a diffusion limiting phosphate film. Thermodynamic models were developed to identify feasible controlling solids. For the no inhibitor treatment, Cu(OH)2 provided the closest prediction of copper release. With phosphate inhibitors both Cu(OH)2 and Cu(PO4)·2H2O models provided plausible predictions. Similarly, with silicate inhibitor, the Cu(OH)2 and CuSiO3·H2O models provided plausible predictions.
Ph.D.
Department of Civil and Environmental Engineering
Engineering and Computer Science
Environmental Engineering PhD
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Lepe, Jose J. „FINITE ELEMENT MODELING OF ICD LEAD SILICONE SOFT-TIPS“. DigitalCommons@CalPoly, 2010. https://digitalcommons.calpoly.edu/theses/286.

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Although highly underutilized by the medical device industry, Finite Element Analysis (FEA) in the development of new technologies is gaining popularity as regulatory bodies such as the Food and Drug Administration (FDA) begin to require additional proof of safety through scientific methods. Non-linear FEA allows engineers to realistically simulate the mechanical behavior of implants as seen in the in-vitro, or in some cases, the in-vivo configurations. The work presented in this report investigates how computational methods can be used to simulate the interaction of a St. Jude Medical silicone soft-tip as it passes through a Peel-Away Sheath (i.e. introducer). In this analysis the soft-tips were modeled as axisymmetric with hyperelastic material properties assigned to the soft-tips. An Ogden, second order hyperelastic material model was used to describe the non-linear stress-strain behavior of silicone soft-tips. The finite element program, ABAQUS/Standard was used to simulate the soft-tip/introducer interactions. The reaction forces obtained through these simulations represent the force required to push a lead through an introducer, and were then compared to experimental data.
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McNeish, Darlene Ivey. „Electrorheological Properties of Lead Titanate and Zeolite Silicone Oil Suspensions“. NCSU, 2004. http://www.lib.ncsu.edu/theses/available/etd-04272004-151239/.

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The purpose of this research has been to prepare and accurately evaluate the dielectric and rheological properties of lead titanate/silicone oil and zeolite/silicone oil suspensions. The dielectric characteristics and rheological changes occurring with the application of electric fields to the suspensions were compared and the lead titanate suspensions were examined for potential use as electrorheological (ER) fluids. A dielectric spectrometer was utilized to quantify the particle/fluid dielectric mismatch of the lead titanate suspensions and the particle/fluid conductivity mismatch of the zeolite suspensions. The rheological properties were examined by conducting a series of systematic analyses without an electric field and then subsequently with the application of dc and ac fields of various frequencies. Optical microscopy of the suspensions without and with an applied electric field has been employed to determine the particle movement and structure within the suspensions. Observations of the lead titanate particles in suspension under an applied electric field elicited the electrophoretic nature of the particles, which moved towards the electrodes instead of forming chains of particles bridging the electrodes. The lead titanate suspensions exhibited either a very small positive ER effect or in some cases a slight negative ER effect, which involves a reduction in the yield stress with applied electric field. This leads us to conclude that the lead titanate/silicone oil suspensions examined in this study are ineffective ER fluid materials. The zeolite/silicone oil suspensions exhibited a positive ER effect.
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Guedes, Victor Hugo de Farias Guedes. „Pulverização foliar de zinco com silício é viável agronomicamente para plantas de sorgo /“. Jaboticabal, 2019. http://hdl.handle.net/11449/183157.

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Orientador: Renato de Mello Prado
Resumo: A pulverização foliar de silício (Si) pode diminuir os efeitos da deficiência de zinco (Zn) nas plantas, pois a adição de Si e de Zn na calda pode aumentar a eficiência da adubação foliar, porém os efeitos em plantas de sorgo ainda não são conhecidos. Assim, objetivou-se avaliar a aplicação foliar de Si na ausência de Zn e com a adição na calda em plantas de sorgo e seus efeitos na nutrição e no desenvolvimento das plantas. O delineamento foi em esquema fatorial 4 x 2, com cinco repetições, tendo quatro concentrações de Zn, na forma de Zn-EDTA: 0; 0,60; 1,20 e 1,80 g L-1 e na ausência e na presença de Si (0,50 g L-1) na calda. Avaliou-se o acúmulo de Zn e Si, eficiência de uso de Zn, extravasamento de eletrólitos celular, teores de clorofila, carotenoides, proteína e a massa seca de parte aérea e de raiz. Nas plantas deficientes em Zn, a pulverização foliar de Si ao aumentar o acúmulo deste elemento na planta diminuiu o extravasamento de eletrólitos celular, aumentou o conteúdo dos pigmentos fotossintéticos e incrementou a produção de massa seca da parte aérea e de raiz. A pulverização foliar de Zn na forma de quelato com adição de Si na calda, em relação a sua ausência, aumentou o acúmulo de Zn na planta, o teor dos pigmentos fotossintetizantes, o teor de proteína e a produção de massa seca de raiz. Conclui-se que a pulverização foliar de Si alivia a deficiência de Zn, e a adição de Si na calda com o Zn é viável agronomicamente para plantas de sorgo.
Abstract: Foliar spraying of silicon (Si) can decrease the effects of zinco (Zn) deficiency on plants. While the addition of Si and Zn in the solution may increase the efficiency of foliar fertilization with this micronutrient, however the effects on sorghum plants are not yet known. The objective of this study was to evaluate the foliar application of Si in the absence of Zn and with the addition of different concentrations of Zn in sorghum plants and their effects on plant nutrition and development. The experiment was carried out in a 4x2 factorial scheme with five replicates having four concentrations of Zn as Zn-EDTA: 0.60, 1.20 and 1.80 g L-1 and in the absence and presence of Si (0.50 g L-1) in solution. Zn and Si accumulation, Zn use efficiency, cellular electrolyte leakage, chlorophyll content, carotenoids, protein content and shoot and root dry mass were evaluated. In the plants deficient in Zn, a foliar spraying of Si increasing the accumulation of this element in the plant, decreased the cellular extravasation and increased the photosynthetic pigments and the dry mass production of shoot and root. Foliar spraying of Zn in the chelate form with addition of Si in relation to its absence increased the accumulation of Zn in the plant, the content of photosynthetic pigments, protein content and root dry mass production. It is concluded that foliar spraying of Si alleviates Zn deficiency and the addition of Si in the solution with Zn is agronomically viable for sorghum plants.
Mestre
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Tchalala, Mohamed Rachid. „Croissance et réactivité du silicène“. Thesis, Paris 11, 2014. http://www.theses.fr/2014PA112287/document.

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L’objet de cette thèse est l’étude de la croissance de silicène sur des substrats d’argent,ainsi que l’étude de sa réactivité vis-à-vis de l’oxygène. La croissance a été réalisée sous ultra-vide et contrôlée par spectroscopie d’électrons Auger (AES) et par diffraction d’électrons lents (LEED). Les structures obtenues et leurs réactivités à l’oxygène ont été étudiées par microscopie à champ proche (STM et nc-AFM) et par spectroscopie de photoémission résolue en angle (ARPES). Nous avons étudié la structure interne des nano-rubans de silicène auto-assemblés sur un substrat d’Ag(110). Sur Ag(111) nous obtenons un feuillet de silicène qui présente différentes structures en fonction de la température du substrat. L’étude de la réactivité des rubans et des feuillets a montré que le silicène formé sur substrat d’argent est relativement stable vis-à-vis de l’oxygène ce qui ouvre des perspectives de fonctionnalisation du silicène. La dernière partie de cette thèse concerne la synthèse de feuillets de silicium par voie chimique. Nous avons mis au point une nouvelle méthode prometteuse de synthèse chimique qui nous a permis de synthétiser des feuillets de silicium de structure graphitique
The objective of this thesis is the study of the growth of silicene on silver substrates as well as its reactivity towards the oxygen. The growth was performed under ultra-high vacuum and controlled by Auger electrons spectroscopy (AES) and low energy electrons diffraction (LEED). The obtained structures and their relativities towards the oxygen were studied by near field microscopy (STM and nc-AFM) and by angle resolved electrons photoemission spectroscopy (ARPES). We have studied the internal structure of the selfassembled silicene nanoribbons on Ag(110) substrate. On Ag(111), we have obtained a silicene sheet presenting different structures versus the temperature of the substrate. The reactivity of silicene nanoribbons and sheets grown on silver show that silicene is relatively stable towards the oxygen which opens a new perspectives of functionalization of the silicene. The last part of this thesis concerns the synthesis of silicone sheets by chemical process. We have develpped a new promising process of chemical synthesis which allowed us to synthesize silicon sheets with graphitic structure
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Bücher zum Thema "Lead silicate"

1

Pisarska, Joanna. Lanthanide-doped lead borate glasses for optical applications. New York: Nova Science Publishers, 2010.

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Pisarska, Joanna. Lanthanide-doped lead borate glasses for optical applications. Hauppauge, N.Y., USA: Nova Science Publishers, 2010.

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Great Britain. Ceramics Industry Advisory Committee., Hrsg. Silica and lead: Control of exposure in the pottery industry. London: HMSO, 1992.

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Ontario. Ministry of Labour. Operations Division. Designated substances in the workplace: A guide to the silica regulation. Toronto, Ont: Ministry of Labour, 2001.

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Ontario. Ministry of Labour. Operations Division. Designated substances in the workplace: A guide to the lead regulation. Toronto, Ont: Ministry of Labour, 2001.

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Division, Ontario Ministry of Labour Operations. Designated substances in the workplace: A general guide to the regulations. Toronto, Ont: Ministry of Labour, 2001.

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Division, Ontario Ministry of Labour Operations. Designated substances in the workplace: A guide to the benzene regulation. Toronto, Ont: Ministry of Labour, 2001.

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Ontario. Ministry of Labour. Operations Division. Designated substances in the workplace: A guide to the mercury regulation. Toronto, Ont: Ministry of Labour, 2001.

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executive, Health and safety. Silica and Lead. Health and Safety Executive (HSE), 1992.

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Preliminary study of lead isotopes in the carbonate-silica veins of Trench 14, Yucca Mountain, Nevada. [Denver, Colo.]: U.S. Dept. of the Interior, U.S. Geological Survey, 1993.

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Buchteile zum Thema "Lead silicate"

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Gooch, Jan W. „Basic Lead Silicate“. In Encyclopedic Dictionary of Polymers, 69. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_1113.

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Milanese, Laura, Renzo Bertoncello, Anne Bouquillon und Jean-Claude Dran. „Protection of Lead Silicate Glasses by Sol-gel Deposition of Silica Films“. In Surface Modification Technologies XVIII: Proceedings of the Eighteenth International Conference on Surface Modification Technologies Held in Dijon, France November 15-17, 2004: v. 18, 217–21. 18. Aufl. London: CRC Press, 2023. http://dx.doi.org/10.1201/9781003423874-52.

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Tran, Thanh-Nam, Nguyen Van Yen, Mai Van Dung, Tran Thanh Dung, Huynh Van Van und Le The Vinh. „Insight into Microstructure of Lead Silicate Melts from Molecular Dynamics Simulation“. In Intelligent Computing & Optimization, 369–75. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-030-00979-3_39.

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Kalita, Monika, Rimlee Saikia, Mohit Sharma und Nitu Borgohain. „Efficient Supercontinuum Generation in Lead Silicate PCF Employing Tan-Hyperbolic Gaussian Pulses“. In Springer Proceedings in Physics, 521–27. Singapore: Springer Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-7691-8_48.

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Leong, Julie Y. Y., Periklis Petropoulos, Heike Ebendorff-Heidepriem, Symeon Asimakis, Roger C. Moore, Ken Frampton, Vittoria Finazzi et al. „Development of Highly Nonlinear Extruded Lead Silicate Holey Fibers with Novel Dispersive Properties“. In Ceramic Transactions Series, 1–9. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2012. http://dx.doi.org/10.1002/9781118407974.ch1.

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Duan, W., Y. Zhuge und Y. Liu. „Effect of Blending Alum Sludge and Ground Granulated Blast-Furnace Slag as Cement Replacement to Mitigate Alkali-Silica Reaction“. In Lecture Notes in Civil Engineering, 93–102. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-3330-3_12.

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AbstractThe alkali–silica reaction (ASR) is a severe durability issue in cement-based materials. Although using calcium-rich supplementary cementitious materials (SCMs) such as ground granulated blast-furnace slag (GGBS) is beneficial for improving mechanical performance, it can lead to critical ASR-induced damage, primarily when high-reactive aggregates are used. We used alum sludge, a byproduct of drinking water treatment processes, and found it to have high efficiency in mitigating ASR in mortars containing GGBS as cement replacement and waste glass as high-reactive aggregate. The raw alum sludge was calcined for 2 h at 800 ℃ and ground to pass a 75-µm sieve. Ternary blended binders were made by replacing 10, 20 and 30% of cement with the mixture of alum sludge and GGBS (ratio 1:1). The mortar samples exhibited a considerable compressive strength and significant ASR resistance when 30% of cement was replaced with the mixture of alum sludge and GGBS compared with the reference samples. Microstructural characterization using X-ray diffraction, backscattered electron images and energy-dispersive X-ray spectroscopy indicated that increasing the aluminum content of the alum sludge could prevent the formation of detrimental Ca-rich and low-flowable ASR gels. The hindering effect was attributed to the alkaline binding ability and the extra precipitation of calcium aluminum silicate hydrate phases due to the abundant Al in the binder.
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Germain, Aurèle, Marta Corno und Piero Ugliengo. „Computing Binding Energies of Interstellar Molecules by Semiempirical Quantum Methods: Comparison Between DFT and GFN2 on Crystalline Ice“. In Computational Science and Its Applications – ICCSA 2021, 632–45. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-86976-2_43.

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AbstractInterstellar Grains (IGs) spread in the Interstellar Medium (ISM) host a multitude of chemical reactions that could lead to the production of interstellar Complex Organic Molecules (iCOMs), relevant in the context of prebiotic chemistry. These IGs are composed of a silicate-based core covered by several layers of amorphous water ice, known as a grain mantle. Molecules from the ISM gas-phase can be adsorbed at the grain surfaces, diffuse and react to give iCOMs and ultimately desorbed back to the gas phase. Thus, the study of the Binding Energy (BE) of these molecules at the water ice grain surface is important to understand the molecular composition of the ISM and its evolution in time. In this paper, we propose to use a recently developed semiempirical quantum approach, named GFN-xTB, and more precisely the GFN2 method, to compute the BE of several molecular species at the crystalline water ice slab model. This method is very cheap in term of computing power and time and was already showed in a previous work to be very accurate with small water clusters. To support our proposition, we decided to use, as a benchmark, the recent work published by some of us in which a crystalline model of proton-ordered water ice (P-ice) was adopted to predict the BEs of 21 molecules relevant in the ISM. The relatively good results obtained confirm GFN2 as the method of choice to model adsorption processes occurring at the icy grains in the ISM. The only notable exception was for the CO molecule, in which both structure and BE are badly predicted by GFN2, a real pity due to the relevance of CO in astrochemistry.
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Chan, Zion, Darryl Hodgkinson, E. Antonio Mangubat, Michael J. Higgs und Daniel Fleming. „Case 98: Silicone Leak or Bleed?“ In Cosmetic Breast Cases, 633–42. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-27714-1_142.

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Tiwari, Udit, und Sahab Dass. „Moisture Stable Soot Coated Methylammonium Lead Iodide Perovskite Photoelectrodes for Hydrogen Production in Water“. In Springer Proceedings in Energy, 141–48. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-63916-7_18.

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AbstractMetal halide perovskites have triggered a quantum leap in the photovoltaic technology marked by a humongous improvement in the device performance in a matter of just a few years. Despite their promising optoelectronic properties, their use in the photovoltaic sector remains restricted due to their inherent instability towards moisture. Here, we report a simple, cost-effective and highly efficient protection strategy that enables their use as photoelectrodes for photoelectrochemical hydrogen production while being immersed in water. A uniform coating of candle soot and silica is developed as an efficient hydrophobic coating that protects the perovskite from water while allowing the photogenerated electrons to reach the counter electrode. We achieve remarkable stability with photocurrent density above 1.5 mA cm−2 at 1 V versus saturated calomel electrode (SCE) for ~1 h under constant illumination. These results indicate an efficient route for the development of stable perovskite photoelectrodes for solar water splitting.
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Van Ngoc, Hoang. „Some Properties of Silicene Nanoribbons When Doped with Two Lead Atoms in an Electric Field“. In Lecture Notes in Electrical Engineering, 987–93. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-1111-8_76.

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Konferenzberichte zum Thema "Lead silicate"

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Long, X. C., und S. R. J. Brueck. „Large Photosensitivity in Lead Silicate Glasses“. In Bragg Gratings, Photosensitivity, and Poling in Glass Waveguides. Washington, D.C.: OSA, 1999. http://dx.doi.org/10.1364/bgpp.1999.ca5.

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Jogad, Rashmi M., Rakesh Kumar, P. S. R. Krishna, M. S. Jogad, G. P. Kothiyal und R. D. Mathad. „Optical and microhardness measurement of lead silicate“. In SOLID STATE PHYSICS: PROCEEDINGS OF THE 57TH DAE SOLID STATE PHYSICS SYMPOSIUM 2012. AIP, 2013. http://dx.doi.org/10.1063/1.4791186.

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Li, Luksun, Paul J. Wells, Elizabeth R. Taylor und D. N. Payne. „Generation of permanent second-order susceptibility in lead-silicate glass fibers“. In Integrated Photonics Research. Washington, D.C.: Optica Publishing Group, 1990. http://dx.doi.org/10.1364/ipr.1990.mj5.

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The creation of a permanent second-order susceptibility [χ(2)] for second-harmonic generation (SHG) in Ge-doped silica fibers has been reported by several authors using various techniques (exposure to IR,1. seeding with IR and its second harmonic,2 dc-field poling with blue light,3 and de field only4). Although the microscopic mechanism governing this interesting phenomenon is still not fully understood, it has been suggested that the alignment of defect centers plays an essential role.5 Defect centers, however, are known to exist or can be induced in many amorphous materials, including a variety of compound glasses that are commercially available. These commercially available compound glasses provide a wide range of options for the fiber core and cladding materials. Moreover, the effect observed to date in Ge-doped silica fibers may be present in a different and stronger form in fibers fabricated from compound glasses. It is therefore interesting to study fibers fabricated from various compound glasses. In this paper we report the first results, to our knowledge, for the dc-field poling effect in lead-silicate glass fibers.
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Komanec, Matej, Tomas Nemecek, Redwan Ahmad, Tomas Martan, Dmytro Suslov und Stanislav Zvanovec. „Suspended-core silica and lead-silicate fibers for nonlinear application and sensing purposes“. In SPIE Photonics Europe, herausgegeben von Kyriacos Kalli und Alexis Mendez. SPIE, 2016. http://dx.doi.org/10.1117/12.2227105.

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Zhidkov, I. S., A. F. Zatsepin, S. O. Cholakh und Yu A. Kuznetsova. „Optical properties and structure of beryllium lead silicate glasses“. In FUNDAMENTALS AND APPLICATIONS IN SILICA AND ADVANCED DIELECTRICS (SIO2014): X International Symposium on SiO2, Advanced Dielectrics and Related Devices. AIP Publishing LLC, 2014. http://dx.doi.org/10.1063/1.4900476.

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Hu, Hongyu, Wenbo Li, Shaozhen Ma und Niloy K. Dutta. „Supercontinuum generation in dispersion-tailored lead-silicate fiber taper“. In SPIE OPTO, herausgegeben von Guifang Li. SPIE, 2013. http://dx.doi.org/10.1117/12.2001174.

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Bhardwaj, S., R. Shukla, S. Sanghi, A. Agarwal, I. Pal, S. K. Tripathi, Keya Dharamvir, Ranjan Kumar und G. S. S. Saini. „Optical and structural analysis of lead bismuth silicate glasses“. In INTERNATIONAL CONFERENCE ON ADVANCES IN CONDENSED AND NANO MATERIALS (ICACNM-2011). AIP, 2011. http://dx.doi.org/10.1063/1.3653645.

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Diantoro, Markus, Desi Ayu Natalia, Nandang Mufti und Arif Hidayat. „Light induced dielectric constant of Alumina doped lead silicate glass based on silica sands“. In THE 3RD INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS SCIENCE AND TECHNOLOGY (ICAMST 2015). Author(s), 2016. http://dx.doi.org/10.1063/1.4945467.

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Alias, Nor Hayati, Wan Shafie Wan Abdullah, Norriza Mohd Isa, Muhammad Jamal Md Isa, Azali Muhammad, Nurazila Mat Zali und Nuhaslinda Ee Abdullah. „XRD, lead equivalent and UV-VIS properties study of Ce and Pr lead silicate glasses“. In ADVANCING NUCLEAR RESEARCH AND ENERGY DEVELOPMENT: Proceedings of the International Nuclear Science, Technology & Engineering Conference 2013 (iNuSTEC2013). AIP Publishing LLC, 2014. http://dx.doi.org/10.1063/1.4866122.

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Mian, Shabbir M., Randall T. May, Christopher J. Todd und Natasha Borjemscaia. „Pump-Probe Thermal Lensing Measurements of Binary Lead Silicate Glasses“. In Frontiers in Optics. Washington, D.C.: OSA, 2005. http://dx.doi.org/10.1364/fio.2005.jwa17.

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Berichte der Organisationen zum Thema "Lead silicate"

1

Zartman, R. E., und L. M. Kwak. Preliminary study of lead isotopes in the carbonate-silica veins of Trench 14, Yucca Mountain, Nevada. Office of Scientific and Technical Information (OSTI), Dezember 1993. http://dx.doi.org/10.2172/145235.

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GARDNER, TIMOTHY J., LINDA I. MCLAUGHLIN, DEBORAH L. MOWERY und RONALD S. SANDOVAL. Preparation Effects on the Performance of Silica-Doped Hydrous Titanium Oxide (HTO:Si)-Supported Pt Catalysts for Lean-Burn NOx Reduction by Hydrocarbons. Office of Scientific and Technical Information (OSTI), Januar 2002. http://dx.doi.org/10.2172/793222.

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