Bibliographies thématiques / Chemical propertie

Littérature scientifique sur le sujet « Chemical propertie »

Auteur : Grafiati
Publié le 14 mars 2023

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Articles de revues sur le sujet "Chemical propertie"

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Mengistu, SL, et AE Shimelis. « Evaluation of the physico-chemical propertie (BH-660) for dextrose production ». African Journal of Food, Agriculture, Nutrition and Development 12, no 53 (3 août 2012) : 6503–16. http://dx.doi.org/10.18697/ajfand.53.10640.

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Dextrose was produced from locally available hybrid variety of maize (Bako Hybrid660) in Ethiopia, using acid extraction. The variety was selected as an experimental input from Bako Agricultural Research Centre for the production of intermediate product starch using wet milling and end-product dextrose. The proximate composition values in the wet, milled, dried and cleaned white dent 2000 g BH-660 maize when steeped in 0.3% sulfur dioxide for 46 hrs at 50oC were determined. The mean values were 11.74%, 64.15%, 4.51%, 10.23%, 6.53% and 2.81%, for moisture content, total starch, germ, gluten, husk and fibre, respectively on dry weight basis. The total starch obtained from wet milling was 91.8% pure starch by mass. The proximate analysis values of moisture, crude protein, crude fat, crude fibre and total ash content of the sample were 7.65 %, 4.89%, 0.35%, 0.75 % 0.29 % , respectively on dry weight basis. Besides these, pH value was also determined to be 4.79. This obtained starch was hydrolyzed by an acid extraction method for the production of BH-660 maize dextrose. An average yield of 91.64% dextrose result was obtained and from this, 92.24% was pure dextrose by mass. Analysis result revealed that moisture, crude protein, crude fat, crude fibre and total ash content of the produced dextrose were 6.24%, 0.11%, 0.25%, 0.30% and 0.03%, respectively on dry weight basis. In addition, the pH value of 6.28 was determined. The control dextrose obtained from Ethiopian Pharmaceutical Manufacturing Share Company analysis values of moisture, crude fibre, crude fat and dextrose content were 5%, 0.24%, 0.23% and 93.73%, respectively on dry weight basis. From these data, it can be concluded that the BH660 maize variety has a significant potential for the production of high quality starch and dextrose, which can be used as a raw material for starch and dextrose processing industries.
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Satbaev, B. N., A. Kh Nurumgaliev, Yu I. Shishkin, E. O. Aimbetova, N. T. Shalabaev et A. B. Satbaev. « High temperature and wear resistant materials with enhanced performance propertie ». NOVYE OGNEUPORY (NEW REFRACTORIES), no 2 (14 septembre 2020) : 30–34. http://dx.doi.org/10.17073/1683-4518-2020-2-30-34.

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The results of studies of obtaining self-sintering refractory masses are presented. A new technology for their manufacture is proposed. The basis of the resulting masses are baritecontaining components (barite or viterite concentrates). High chemical resistance, refractoriness, mechanical strength, hardness and wear resistance determine the scope of their application ― the manufacture of refractory products, linings, putties and concrete.
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Li, Xiao Li, Xiao Peng Li et Yu Li. « Correlate the Toxicity of PAHs with Physical and Chemical Propertie QSAR Descriptors by PCR Method ». Advanced Materials Research 599 (novembre 2012) : 151–54. http://dx.doi.org/10.4028/www.scientific.net/amr.599.151.

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The Quantitative Structure Activity Relationship (QSAR) was used to correlate eleven physical and chemical properties (GTCi, Vc, BP, MP, Hf, Tc, Pc, MW, MV, logKOWand logKOC) with toxicity of polycyclic aromatic hydrocarbons (PAHs). A multi-parameter regression model was conducted to simulate the toxicity of PAHs after minimization of the multicollinearity among the ion characteristics using principal component regression (PCR). The toxicity of PAHs increased with the positively correlated variables including GTCi, Vc, BP, MW, MV, logKOWand logKOC. The regression model provided the high simulate ability, with Nash-Suttcliffe simulation efficiency coefficients (NSC) of 0.89 for the modeling. The model may be successfully employed to predict the toxicity of PAHs and be used for further analysis.
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Lazic, Anita, Zeljko Mandic, Natasa Valentic, Gordana Uscumlic et Nemanja Trisovic. « New spirohydantoins derived from β-tetralone : Design, synthesis and evaluation of their pharmacokinetically relevant propertie ». Chemical Industry 73, no 2 (2019) : 79–92. http://dx.doi.org/10.2298/hemind181203007l.

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To create new anticonvulsant drugs, two series of spirohydantoins derived from ?-tetralone bearing a 4-substituted benzyl group (1a?1g) or a 2-(4-substituted phenyl)-2-oxoethyl group (2a?2f) in position 3 of the hydantoin ring were synthesized. The chemical structure of these compounds was confirmed by determination of the melting point, elemental analysis and FT-IR, 1H NMR, 13C NMR and UV-Vis spectroscopic methods. Effects of the substituents in the benzyl moiety on the shift of the absorption maxima of compounds 1a?1g and 2a?2f were analyzed using the Hammett's equation. Namely, a split in the Hammett plot at the parent compounds 1a and 2a revealed different electronic transitions within the molecules with the electron-donating substituents from those bearing the electron-accepting substituents, thus the electron-accepting effect on the shift of the absorption maxima being considerably stronger. The influence of the chemical structure on the pharmacokinetically relevant properties of the investigated hydantoin derivatives was evaluated using the Lipinski?s rule of five, Veber, Egan and Ghose's empirical criteria, as well as different in silico methods. When compared to phenytoin (5,5-diphenylhydantoin) as the referent drug, compounds with a halogen or electron-donating substituent are expected to possess better intestinal absorption and passage through the blood-brain barrier. Depending on the nature of the substituent present in the benzyl moiety, compounds 1a?1g and 2a?2f can be potent activators/inhibitors of some cytochrome P450 izoenzymes including CYP1A2, CYP2C19 and CYP2C9. Regarding biological activity profile, compounds with the electron-accepting substituents are likely to reveal the pharmacological potential similar to that of phenytoin, while those bearing electron-donating substituents are predicted to have the antimigrenic activity. All compounds were found to bear a low risk of being mutagenic or tumorigenic. The calculated molecular descriptors indicate that the investigated compounds fulfill necessary empirical criteria which qualify them as interesting drug candidates.
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Bosha, Abraham, Abitew Lagibo Dalbato, Tamado Tana, Wassu Mohammed, Buzayew Tesfaye et Laila M. Karlsson. « Nutritional and chemical propertie s of fermented food of wild and cultivated genotypes of enset ( Ensete ventricosum ) ». Food Research International 89 (novembre 2016) : 806–11. http://dx.doi.org/10.1016/j.foodres.2016.10.016.

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Hossain, M. Z., P. von Fragstein, P. von Niemsdorff et J. Heß. « Effect of Different Organic Wastes on Soil Propertie s and Plant Growth and Yield : a Review ». Scientia Agriculturae Bohemica 48, no 4 (20 décembre 2017) : 224–37. http://dx.doi.org/10.1515/sab-2017-0030.

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Abstract The use of organic wastes in agriculture plays a great role in recycling essential plant nutrients, sustaining soil security as well as protecting the environment from unwanted hazards. This review article deals with the effect of different kinds of organic wastes on soil properties and plant growth and yield. Municipal solid waste is mainly used as a source of nitrogen and organic matter, improving soil properties and microbial activity that are closely related to soil fertility. Biowaste and food waste increase pH, nitrogen content, cation exchange capacity, water holding capacity, and microbial biomass in soil. Sewage sludge contains various amounts of organic matter and huge amounts of plant nutrients. Manure is a common waste which improves soil properties by adding nutrients and increases microbial and enzyme activity in soil. It also reduces toxicity of some heavy metals. These organic wastes have a great positive impact on soil physical, chemical, and biological properties as well as stimulate plant growth and thus increase the yield of crops.
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SLONECKI, JERZY. « The effect of chain length and content of flexible oligo(oxyethylene) segments on some properties of copoly(ester-ether)s. Part II. Mechanical propertie ». Polimery 41, no 01 (janvier 1996) : 31–39. http://dx.doi.org/10.14314/polimery.1996.031.

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Onuorah, E. O., J. T. Nwabanne et E. L. C. Nnabuife. « Pulp and paper making potentials of elaeis guineensis (oil palm) grown in south east, Nigeria ». World Journal of Engineering 12, no 1 (1 février 2015) : 1–12. http://dx.doi.org/10.1260/1708-5284.12.1.1.

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The objective of this study was to determine the pulping and paper making potentials of oil palm (E guineensis). Fibrous material from the whole trunk (WT), empty fruit bunch (EFB, fronds (FDS) and depithed trunk (DT) were evaluated using proximate chemical analysis, fiber morphological and related characteristics. Effect of active alkali (AA) % as Na2O on kraft pulping properties and the handsheet paper propertie was studied. Proximate chemical analysis reveal acceptable cellulose content for EFB (43.51%), FDS (51.13%) and DT (53.80%) while WT (32.44) is unacceptable. Low lignin content obtained (17.8−21.8%) suggests easier pulping characteristics. The high % NaOH solubility of WT (26.05%) and FDS (32.1%) suggest potential of high effluent loads. Fiber morphological studies revealed that approximately 83% of fibers are ≤ 1.5 mm in length thus putting oil palm as a short fiber source. The slenderness ratio ranges from 33.44 to 82.80; Runkelratio from 0.40 to 0.63; flexibility co-efficient from 57.20 to 71.46 and rigidity co-efficient from 0.29 to 0.43. Studies of pulping properties reveal that as active alkali % was increased the percentage total pulp yield, % screened pulp yield, % screened rejects, pulp kappa number, klason lignin and tear index of resultant pulp/handsheet all/each decreased. Conversely, as active alkali % was increased the Brust index, double fold number, breaking length, tensile index of paper handsheets and pulp brightness were each enhanced. It was concluded that in pulping of WT AA% should be < 14 and EFB pulping should be ≤ 14 in order to have acceptable yield. Also in order to have acceptable tear index, AA% should be ≤ 16. It is being recommended that trunks should be depithed in order to have acceptable yield. The fibrous material from oil palm make acceptable raw material for paper making and are good hardwood substitutes. Paper produced when bleached can be used for printing and writing papers while the unbleached grades can be used for wrapping and package papers and for corrugated boards.
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J.O, Alagbe, Adedeji M.O, Habiba Z, Nwosu Gloria et Dabara Comfort Wyedia. « Physico-Chemical Properties of Indigofera Zollingeriana Seed Oil ». Biomedical Research and Clinical Reviews 6, no 2 (24 janvier 2022) : 01–03. http://dx.doi.org/10.31579/2692-9406/099.

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The objective of the present study is to examine the physico-chemical properties of Indigofera zollingeriana seed oil. Physico-chemical parameters of oils are important in the determination of edibility and other industrial applications. All the laboratory analysis were carried out using standard procedures according to AOAC (2000). The acid value, peroxide value, iodine value, saponfication value, refractive index and free fatty acids of cold pressed Indigofera zollingeriana seed oil was found to be 17.11 mg NaOH/g, 23.04 meq/kg, 180.4 gI2/100g, 118.7 mg/KOH/g and 14.10 %. The refractive index (20oC) and specific gravity (25oC) was 2.01 and 1.02 respectively. The extracted oil was Indigo in colour at liquid state. It was concluded the oil has a high acid value, peroxide value and free fatty acid which favours the use of the oil for industrial use such as soap production and cosmetics.
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Alkhatib, Ahed J., Sani S. Bala, S. S. Bashir et Abdulhadi M. « CHEMICAL AND PHARMACEUTICAL PROPERTIES OF PEFLOXACIN : A REVIEW ». Indian Research Journal of Pharmacy and Science 5, no 2 (2018) : 1427–31. http://dx.doi.org/10.21276/irjps.2018.5.2.4.

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Thèses sur le sujet "Chemical propertie"

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MARSALA, Valentina. « STUDY OF CHEMICAL-PHYSICAL PROPERTIES IN INDUSTRIAL BIOCHAR ». Doctoral thesis, Università degli Studi di Palermo, 2014. http://hdl.handle.net/10447/90992.

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CARDELLI, VALERIA. « Changes occurring in the topsoil and in rhizosphere under fagus sylvatica along a small latitudinal-altitudinal gradient ». Doctoral thesis, Università Politecnica delle Marche, 2017. http://hdl.handle.net/11566/245508.

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Durante il triennio di dottorato è stato studiato l'effetto del cambio di temperatura sulle proprietà chimiche e biochimiche di due componenti di suoli sotto faggio (Fagus sylvatica) dell'Appennino centrale (Italia): la rizosfera e il topsoil (orizzonti organici e il primo orizzonte minerale). Il disegno sperimentale ha considerato un transetto altitudinale (800 e 1000 m), con una differenza di temperatura media annua dell'aria di 1°C, e un transetto latitudinale, dove non si hanno differenze di temperatura media annua, ma ve ne sono in termini di escursione termica estate-inverno. La ricerca è stata preceduta dalla messa a punto di un metodo strumentale per ottenere più rapidamente dati di carbonio e azoto totali (TN) che siano affidabili e non distruttivi (Paper I). Risultati significativi sono stati ottenuti analizzando la rizosfera che, soprattutto a 1000 m, ha mostrato maggiori contenuti di carbonio organico totale (TOC), di sostanza organica estraibile in acqua (WEOM) e P disponibile del suolo bulk. Con l'aumento di 1°C si potrebbe così verificare un'accelerazione del ciclo dei nutrienti negli ambienti forestali a 1000 m (Paper II). Questo risultato è stato confermato da un maggior contenuto di zuccheri, fenoli solubili e tannini nella WEOM degli stessi suoli (Paper III). Comparando i risultati lungo la latitudine, gli orizzonti minerali sottosuperficiali sono risultati molto simili. Al contrario, il topsoil ha mostrato differenze chimiche e biochimiche attribuibili all’escursione di temperatura estate-inverno, con differenti andamenti delle attività enzimatiche secondo il ruolo degli enzimi nella degradazione della lettiera. In ogni caso, nel topsoil e negli orizzonti sottosuperficiali, l'altitudine è responsabile dell’incremento del TOC, del TN e dello spessore degli orizzonti organici, confermando che l'aumento di temperatura a queste quote potrebbe accelerare la velocità di mineralizzazione della sostanza organica (Paper IV).
The research conducted during the three years doctoral activity was focused on the effect of temperature change on chemical and biochemical properties of two different soil components of beech (Fagus sylvatica) forest soils from central Apennines (Italy): i) rhizosphere, which was contrasted with the bulk soil, and ii) organic horizons (OLn, OLv, OH) and the first mineral horizon (A). In the experimental design a small altitudinal transect (800 and 1000 m) with a different mean annual air temperature of 1°C was considered, together with a latitudinal transect with no difference in the mean annual air temperature but different for the summer-winter thermal excursion. The research was preceded by the development of a method to obtain data of total carbon and nitrogen with non-destructive and less time-consuming instruments in order to develop rapid and reliable field analyses (Paper I). Significant results were obtained with the rhizosphere, which showed marked differences with respect to the bulk at 1000 m, particularly for the greater content of total organic carbon (TOC), water extractable organic matter (WEOM), and available P concentration due to rhizodeposition processes. The enriched micro-environment of the rhizosphere also fosters a rapid nutrients' cycle (Paper II). This was confirmed by the higher content of sugars, soluble phenols and tannins in the rhizosphere WEOM at 1000 m (Paper III). Comparing results along the latitudinal transect, in the subsoil only small differences were recorded. Conversely, the topsoil (O+A horizons) showed chemical and biochemical differences ascribable to the summer-winter thermal excursion trend, with different behaviors of the enzymatic activities depending on their role in litter decomposition. However, in both topsoil and subsoil, horizons thickness and the TOC and total nitrogen contents were higher at 1000 than at 800 m, so confirming that an increase of temperature at these altitudes will increase the mineralization rate (Paper IV).
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PUMA, SARA. « Chemico-mechanical improvement of bentonite barriers for pollutant containment ». Doctoral thesis, Politecnico di Torino, 2013. http://hdl.handle.net/11583/2507922.

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Pollution control represents one of the main problems of public interest in all industrialised countries. Since the 1970s, when the engineering of waste containment began, the overall objective of Environmental Geotechnics was to limit contaminant discharge to groundwater and subsoil. Since the 1990s design engineers and environmental agencies have shown a growing interest in the use of geosynthetic clay liners (GCLs) as an alternative to compacted clays in cover systems or in bottom lining of waste containment facilities because they have very low hydraulic conductivity to water and relatively low cost. GCLs contain a thin layer of sodium bentonite with a dry thickness between 5 and 10 mm, sandwiched between two geotextiles or glued to a geomembrane, GM. The excellent hydraulic performances of GCLs have to be attributed to bentonite characteristics and, since these last are greatly influenced by the chemical composition of the environment surrounding the barrier and by the state parameters, the performances of GCLs can be altered, and then worsened, by a simple variation of the chemical or physical boundary conditions. Aimed at solving this last issue, clay liners and GCLs have undergone great change during the last two decades, with new material being introduced (i.e. polymers) and new design methods being adopted (i.e. membrane behaviour investigation, contaminant diffusion estimation). The research project developed during the Ph.D. has been focused on bentonite barriers. The term “bentonite barriers” includes bentonite or bentonite-based barriers which find application both in urban waste landfill, hazardous or radioactive wastes final disposal and in hydrocarbon containment. The developed theoretical and experimental study has had the aim of evaluating the possible improvement of containment performance of the bentonite barriers, towards standard and non standard liquids, acting on their state parameters, chemical composition, and boundary conditions at installation. The contents of the thesis are reported below: Chapter 1 – Bentonite barriers. This chapter is an introduction to the topic of the research activity: the improvement of contaminant containment performances of the bentonite barrier. Chapter 1 gives a phenomenological and physical description of the mineralogical, chemical and physical properties of sodium and calcium bentonite. Moreover, the main features and issues concerning Geosynthetic Clay Liners, and bentonite barriers in general, are introduced. Chapter 2 – Containment performances of natural and polymer-modified bentonite barriers subjected to physical pre-treatments. The role of physical pre-treatments, such as pre-hydration, pre-consolidation and salt removal, applied to sodium and polymer modified bentonites, has been analyzed in the Paper reported in chapter 2, titled: “THE ROLE OF PHYSICAL PRETREATMENTS ON THE HYDRAULIC CONDUCTIVITY OF NATURAL AND POLYMER MODIFIED SODIUM BENTONITES”. Moreover, the effect of the presence or absence of needling across the bentonite layer has been studied. All these variables have been shown to influence the hydraulic performances of bentonite through hydraulic conductivity change in both short and long term conditions. Physical pre-treatments and polymer addiction, in fact, influence the swelling behaviour of bentonite and its response to the cation exchange phenomenon. Chapter 3 – Osmotic and swelling properties of bentonite barriers. In the Paper included in this chapter, titled “COUPLED CHEMICAL-HYDRAULIC-MECHANICAL BEHAVIOUR OF BENTONITES”, a theoretical approach has been proposed in order to derive constitutive equations which describe the coupled chemical-hydraulic-mechanical behaviour of bentonite barriers, with the aim to assess their long term performance. The phenomenological parameters that govern the transport of electrolyte solutions through bentonites, i.e. the hydraulic conductivity, the reflection coefficient, which is also called the chemico-osmotic efficiency coefficient, and the osmotic effective diffusion coefficient, have been measured through laboratory tests on a natural sodium bentonite The obtained results have been interpreted by assuming that the microscopic deviations of the pore solution state variables from their average values are negligible. In this way, it is possible to interpret the macroscopic behaviour on the basis of the physical and chemical properties of the bentonite mineralogical components. At the end of the chapter two further chemico-osmotic tests are described aimed at analysing (1) the osmotic behaviour of calcium bentonite and (2) the effects induced on osmotic behaviour by stress-strain properties. Moreover, the osmotic results are confronted with data from literature. Finally, the design of a new osmotic apparatus to measure both the swelling pressure and the reflection coefficient is proposed. Chapter 4 – Hydrocarbon containment performances of natural and polymer-modified bentonite barriers. Background information on hydrocarbon behaviour in soils is reported in the first part of this chapter. In particular, the effects of capillary forces on the distribution of immiscible fluids in porous media and the theoretical aspects, regarding the formation of tactoids induced by the low dielectric constant that characterizes the most of hydrocarbon species, are studied. An experimental study is presented in the Paper titled “HYDRAULIC PERFORMANCE OF GCLS WITH DIESEL OIL AND POLYMER TREATMENT PROPOSAL”, which is aimed at evaluating the hydraulic performance of a needle-punched GCL using both standard liquids (i.e. de-ionized water) and diesel oil in order to estimate the change in hydraulic conductivity and swelling ability upon contact or permeation with hydrocarbons. Moreover, the hydraulic conductivity to diesel oil of GCL samples saturated at different initial gravimetric water contents was investigated with the aim to analyse the effect of initial water saturation on hydrocarbon containment performances. Finally, the swelling and hydraulic performances to diesel oil of an innovative material, obtained by mixing sodium bentonite with a polymer, were measured. Chapter 5 – Containment performances of a bentonite-based barrier constituted of municipal solid waste bottom ashes. The research described in the Paper included in this chapter, titled “REUSE OF MSWI BOTTOM ASH MIXED WITH NATURAL SODIUM BENTONITE AS LANDFILL COVER MATERIAL” has the aim of evaluating the reuse of incinerator slag, mixed with sodium bentonite, for landfill capping system components. A chemical, hydraulic and mechanical characterization was performed on pure bottom ash (BA) samples from an incinerator in the North of Italy and on the BA-bentonite mixture. This study qualifies the BA-bentonite mixture as a suitable material for landfill cover in Italy. Moreover, owing to the low release of toxic compounds from BA, the proposed cover system does not affect the leachate quality in the landfill. Chapter 6 – Finite difference modelling of diffusive flux of Calcium through a bentonite barrier in in-situ conditions. The evidence of the strong degradation induced in the hydraulic performances of sodium bentonite barriers by the cation exchange phenomenon has been highlighted in the previous chapters. This experimental result underlines the need to study the transitional development of the cation exchange phenomenon with the aim to compare that to the period in which landfill barrier performances have to be guaranteed in in-situ conditions. The mathematical study developed in this chapter is focused on the evaluation of the role of the diffusive component of Calcium flux in the cation exchange phenomenon which can develop in a sodium bentonite barrier, placed in an environment inexorably rich in chemical compounds containing soluble Calcium (i.e. the natural soil, the aquifer, the drainage layer saturated with waste leachate or raining water).
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Ercoli, Roberto. « Chemical neutralization of industrial by-products from the secondary aluminum industry : re-use as foaming agents for the synthesis of geopolymers and monitoring of the hydrogen-rich gas production ». Doctoral thesis, Urbino, 2022. http://hdl.handle.net/11576/2698511.

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Barrett, Geraldine Patricia. « Synthesis and physico-chemical properties of chemically modified calixarene receptors ». Thesis, Queen's University Belfast, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.333798.

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Adesina, Olumide, Cassandra T. Eagle, Ayobami Olukanni et Reza Mohseni. « Purification of Cyclohexene for Cyclopropanation Reactions ». Digital Commons @ East Tennessee State University, 2019. https://dc.etsu.edu/asrf/2019/schedule/143.

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Environmentally friendly reactions yielding cis-cyclopropanes are desired in the insecticide industry as these are most effective at reducing the population of insects while remaining benign to the environment. We are exploring the best parameters for the most effective cis-cyclopropanation reactions. An alkene and a diazo compound react together in the presence of a dirhodium catalyst to produce cyclopropanes. First however, the starting materials must be pure. Alfa Aesar supplies cyclohexene which is reported to be 99% pure, however, Gas column chromatography/Mass spectroscopy reveals that the sample is only 3% cyclohexene. Using an adopted published procedure, we discovered that distillation under nitrogen produces cyclohexene in greater than 95% pure. This is suitable for use in cyclopropanation reactions.
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Nilsson, Frederik. « Alkylglucosides physical-chemical properties / ». Lund : Physical Chemistry 1, Center for Chemistry and Chemical Engineering, Lund University, 1998. http://catalog.hathitrust.org/api/volumes/oclc/39761789.html.

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Olukanni, Ayobami, Cassandra T. Eagle, olumide Adesina et Reza M. Mohseni. « Purification of Ethyl Diazoacetate by Vacuum Distillation for use in Cyclopropanation Reactions ». Digital Commons @ East Tennessee State University, 2019. https://dc.etsu.edu/asrf/2019/schedule/135.

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Environmentally friendly insecticides have long been desired in the production of food. Pyrethiod compounds not only decompose under light and heat, but they are highly toxic to insects while having effectively no toxicity to mammals. The cis-cyclopropane ring in pyrethiod insecticides is the most challenging component to synthesize. We are exploring the best parameters for the most effective cis-Cyclopropanation reactions. An alkene and a diazo compound react together in the presence of a dirhodium catalyst to produce cyclopropanes. First however, the starting materials must be pure. My part of the project is to purify ethyl diazoacetate(EDA). Column chromatography has been used, but yielded no fraction containing EDA as determined by Gas chromatography/Mass spectrometry. Extraction of EDA with sodium carbonate solution yielded similar results. Thus, I turned to distillation at reduced pressure. This method produced EDA in high enough purity to be used in cyclopropanation reactions. The purity of EDA was determined by H-1 nuclear magnetic resonance spectroscopy.
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Papapanayotou, I. « Chemical properties and optical properties of carbonaceous particles ». Thesis, University of Leeds, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.383288.

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Indoitu, Rodica. « Chemical properties of aerosols over Israel / ». [Sede Boker] : Albert Katz International School for Desert Studies, 2006. http://aranne5.lib.ad.bgu.ac.il/others/IndoituRodica.pdf.

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Livres sur le sujet "Chemical propertie"

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Yaws, Carl L. Chemical properties handbook : Physical, thermodynamic, environmental, transport, safety, and health related properties for organic and inorganic chemicals. New York : McGraw-Hill, 1999.

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1936-, Mackay Donald, et Mackay Donald 1936-, dir. Handbook of physical-chemical properties and environmental fate for organic chemicals. 2e éd. Boca Raton, FL : Taylor & Francis, 2005.

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Mackay, Donald. Illustrated handbook of physical-chemical properties and environmental fate for organic chemicals. Boca Raton : Lewis, 1997.

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Ying, Shiu Wan, et Ma Kuo Ching, dir. Illustrated handbook of physical-chemical properties and environmental fate for organic chemicals. Boca Raton : Lewis Publishers, 1992.

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Donald, Mackay. Illustrated handbook of physical-chemical properties and environmental fate for organic chemicals. Boca Raton : Lewis Publishers, 1992.

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6

Donald, Mackay. Illustrated handbook of physical-chemical properties and environmental fate for organic chemicals. Boca Raton : Lewis Publishers, 1992.

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Donald, Mackay. Illustrated handbook of physical-chemical properties and environmental fate for organic chemicals. Boca Raton : Lewis, 1995.

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8

Geological Survey (U.S.), dir. Physical and chemical properties and health effects of thirty-three toxic organic chemicals. [Reston, Va.?] : U.S. Dept. of the Interior, Geological Survey, 1987.

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Yaws handbook of properties of the chemical elements. Norwich, N.Y : Knovel, 2011.

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Richardson, Stephen. Sulphide ore minerals:surface chemical properties. Birmingham : Aston University. Department of Electricaland Electronic Engineering and Applied Physics, 1988.

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Chapitres de livres sur le sujet "Chemical propertie"

1

Brüggemann, R., et B. Münzer. « Physico-chemical Data Estimation for Environmental Chemicals ». Dans Physical Property Prediction in Organic Chemistry, 303–34. Berlin, Heidelberg : Springer Berlin Heidelberg, 1988. http://dx.doi.org/10.1007/978-3-642-74140-1_20.

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Gunstone, F. D. « Chemical Properties ». Dans The Lipid Handbook, 449–84. Boston, MA : Springer US, 1986. http://dx.doi.org/10.1007/978-1-4899-2905-1_10.

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Smith, Joseph V., et William L. Brown. « Chemical Properties ». Dans Feldspar Minerals, 298–390. Berlin, Heidelberg : Springer Berlin Heidelberg, 1988. http://dx.doi.org/10.1007/978-3-642-72594-4_14.

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Gooch, Jan W. « Chemical Properties ». Dans Encyclopedic Dictionary of Polymers, 137. New York, NY : Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_2251.

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Evsyukov, S. E. « Chemical Properties ». Dans Physics and Chemistry of Materials with Low-Dimensional Structures, 309–16. Dordrecht : Springer Netherlands, 1999. http://dx.doi.org/10.1007/978-94-011-4742-2_20.

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Gooch, Jan W. « Chemical Property ». Dans Encyclopedic Dictionary of Polymers, 137. New York, NY : Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_2252.

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Keese, Paul, et Robert H. Symons. « Physical-Chemical Properties ». Dans The Viroids, 37–62. Boston, MA : Springer US, 1987. http://dx.doi.org/10.1007/978-1-4613-1855-2_3.

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Riesner, Detlev. « Physical-Chemical Properties ». Dans The Viroids, 63–98. Boston, MA : Springer US, 1987. http://dx.doi.org/10.1007/978-1-4613-1855-2_4.

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McCarty, L. B. (Bert). « Soil Chemical Properties ». Dans Golf Turf Management, 77–110. Boca Raton : Taylor & Francis, 2018. : CRC Press, 2018. http://dx.doi.org/10.1201/9781351057950-3.

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Carreón-Calderón, Bernardo, Verónica Uribe-Vargas et Juan Pablo Aguayo. « Chemical Reaction Equilibrium ». Dans Thermophysical Properties of Heavy Petroleum Fluids, 273–306. Cham : Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-58831-1_7.

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Actes de conférences sur le sujet "Chemical propertie"

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Stewart-Liddon, Christine, Neil J. Goodwin, Gordon M. Graham, Tore Tjomsland, Britt Marie Hustad, Odd Geir Svela, John Helge Olsen et Simon Østgaard. « Qualification of Chemicals/Chemical Injection Systems for Downhole Continuous Chemical Injection ». Dans SPE International Oilfield Scale Conference and Exhibition. SPE, 2014. http://dx.doi.org/10.2118/spe-169782-ms.

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Abstract Downhole Continuous Injection (DHCI) Systems are increasingly being installed in wells for the delivery of a range of chemicals, including application-specific formulations and multi-component chemicals. Although costly, these systems offer the advantage of controlling chemical doses, preventing interruptions to production by providing constant delivery of chemicals and can be used in place of squeeze treatments that can be costly or inappropriate if formation damage is a risk. However, such systems are not without challenges for engineering design, operation and the effective qualification required for the chemicals before use. DHCI involves chemical injection through multi-kilometre capillary tubing, as well as injection through inline filters and one or more injection valves. Failures of continuous injection systems have been linked to a variety of causes such as corrosion, particulate formation or chemical gunking, resulting in line plugging or blockage of injection valves and filters. The work described in this paper was initiated to investigate known DHCI issues within Statoil fields and to develop laboratory tests to identify characteristics of chemical formulations that result in similar behaviour, and thus allow such formulations to be de-selected prior to use. The paper describes a range of chemical qualification methods for DHCI systems, focusing on qualifying the chemical for use in a DHCI. Test methods have been developed which demonstrate the ways in which changes in physical properties can readily occur under downhole injection which can have a considerable detrimental impact on the integrity and effectiveness of the DHCI system. These methods have now been finalised into a set of chemical qualification protocols for Statoil. This paper will present the basis of these test protocols and thereby intends to present best practice for chemical/system qualification for DHCI. Results from both extensive laboratory method development studies and field case histories will be included throughout the paper to illustrate the challenges faced and the qualification solutions developed.
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Komatsu, Koichi. « First Chemical Synthesis of H2@C60 ». Dans ELECTRONIC PROPERTIES OF NOVEL NANOSTRUCTURES : XIX International Winterschool/Euroconference on Electronic Properties of Novel Materials. AIP, 2005. http://dx.doi.org/10.1063/1.2103819.

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Niesz, K. « Mechano-chemical functionalization of carbon nanotubes ». Dans STRUCTURAL AND ELECTRONIC PROPERTIES OF MOLECULAR NANOSTRUCTURES : XVI International Winterschool on Electronic Properties of Novel Materials. AIP, 2002. http://dx.doi.org/10.1063/1.1514079.

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Hinsberg, William D., Scott A. MacDonald, Nicholas J. Clecak, Clinton D. Snyder et Hiroshi Ito. « Influence of polymer properties on airborne chemical contamination of chemically amplified resists ». Dans SPIE'S 1993 Symposium on Microlithography, sous la direction de William D. Hinsberg. SPIE, 1993. http://dx.doi.org/10.1117/12.154774.

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Sambasivam, S., D. Paul Joseph, B. K. Reddy, C. K. Jayasankar, P. Predeep, S. Prasanth et A. S. Prasad. « Chemical synthesis and Characterization of Cu doped ZnS nanoparticles ». Dans THERMOPHYSICAL PROPERTIES OF MATERIALS AND DEVICES : IVth National Conference on Thermophysical Properties - NCTP'07. AIP, 2008. http://dx.doi.org/10.1063/1.2927537.

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Tomaselli, M. « Dynamics of Diatomic Molecules in a Chemical Trap ». Dans STRUCTURAL AND ELECTRONIC PROPERTIES OF MOLECULAR NANOSTRUCTURES : XVI International Winterschool on Electronic Properties of Novel Materials. AIP, 2002. http://dx.doi.org/10.1063/1.1514066.

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Maeda, Yutaka. « Chemical Modification of SWNTs ». Dans MOLECULAR NANOSTRUCTURES : XVII International Winterschool Euroconference on Electronic Properties of Novel Materials. AIP, 2003. http://dx.doi.org/10.1063/1.1628029.

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Pekker, S., J. P. Salvetat, E. Jakab, J. M. Bonnard et L. Forró. « Chemical functionalization of carbon nanotubes ». Dans ELECTRONIC PROPERTIES OF NOVEL MATERIALS--SCIENCE AND TECHNOLOGY OF MOLECULAR NANOSTRUCTURES. ASCE, 1999. http://dx.doi.org/10.1063/1.59868.

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Magrez, A. « Mass Production of Multiwalled Carbon Nanotubes by Chemical Vapor Deposition ». Dans ELECTRIC PROPERTIES OF SYNTHETIC NANOSTRUCTURES : XVII International Winterschool/Euroconference on Electronic Properties of Novel Materials. AIP, 2004. http://dx.doi.org/10.1063/1.1812043.

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Shimotani, Hidekazu. « Quantum Chemical Study on La2@C80 : Configuration of Endohedral Metals ». Dans ELECTRIC PROPERTIES OF SYNTHETIC NANOSTRUCTURES : XVII International Winterschool/Euroconference on Electronic Properties of Novel Materials. AIP, 2004. http://dx.doi.org/10.1063/1.1812099.

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Rapports d'organisations sur le sujet "Chemical propertie"

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McCarthy, Thomas J. Investigation of Chemical and Physical Properties of Surface ; Modified Chemically Resistant Polymers. Fort Belvoir, VA : Defense Technical Information Center, septembre 1992. http://dx.doi.org/10.21236/ada284616.

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Petit, Sylvain, Joannie Chin, Amanda Forster, Michael Riley et Kirk Rice. Effect of artificial perspiration and cleaning chemicals on mechanical and chemical properties of ballistic fibers. Gaithersburg, MD : National Institute of Standards and Technology, 2008. http://dx.doi.org/10.6028/nist.ir.7494.

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Terah, E. I. Video lectures on the discipline of «Chemistry» for students of specialty «Dentistry». SIB-Expertise, avril 2022. http://dx.doi.org/10.12731/er0555.13042022.

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There are video lectures on chemistry for students of the specialty "Den-tistry": 6 lectures on general chemistry and 11 lectures on bioorganic chemistry. The total duration of the video lectures is 13 hours 17 minutes. In lectures on general chemistry, the basic provisions of chemical ther-modynamics and kinetics, chemical equilibrium, dispersed systems, solutions and their properties, ionic equilibria in solutions of elektrolites, buffer solutions, hydrolysis are considered. Lectures on bioorganic chemistry discuss the properties and importance of biologically important compounds, including proteins, carbohydrates, nucleic acids and fats, as well as issues of lipid peroxidation, antioxidant protection.
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Benny, H. L. Physical properties of Dowell Chemical Seal Ring. Office of Scientific and Technical Information (OSTI), juillet 1985. http://dx.doi.org/10.2172/5421514.

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Kacher, Christian D. Chemical and nuclear properties of Rutherfordium (Element 104). Office of Scientific and Technical Information (OSTI), octobre 1995. http://dx.doi.org/10.2172/193914.

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Scripsick, R. C., S. Ehrman et S. K. Friedlander. Chemical and physicochemial properties of submicron aerosol agglomerates. Office of Scientific and Technical Information (OSTI), décembre 1998. http://dx.doi.org/10.2172/560747.

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Zhao, Youyang. Molten Chloride Thermophysical Properties, Chemical Optimization, and Purification. Office of Scientific and Technical Information (OSTI), novembre 2020. http://dx.doi.org/10.2172/1734652.

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Raj, R. Ceramic films and interfaces : Chemical and mechanical properties. Office of Scientific and Technical Information (OSTI), décembre 1991. http://dx.doi.org/10.2172/5834676.

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Lager, Daniel, Lia Kouchachvili et Xavier Daguenet. TCM measuring procedures and testing under application conditions. IEA SHC Task 58, mai 2021. http://dx.doi.org/10.18777/ieashc-task58-2021-0004.

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This Subtask aims to have reliable thermal analysis methods/protocols and procedures for the characterization of aterial and reaction properties for sorption and chemical reactions of thermal energy storage (TES) applications. One goal is an inventory of already standardized measurement procedures for TCM as well as of needed characterization procedures.
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Starr, T. L., et N. Hablutzel. Measurement of gas transport properties for chemical vapor infiltration. Office of Scientific and Technical Information (OSTI), décembre 1996. http://dx.doi.org/10.2172/441120.

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