Letteratura scientifica selezionata sul tema "Bulletin de l'I.N.G"

The commuting graph of a finite non-abelian group G with center Z(G), denoted by Γc(G), is a simple undirected graph whose vertex set is G∖Z(G), and two distinct vertices x and y are adjacent if and only if xy=yx. Alwardi et al. (Bulletin, 2011, 36, 49-59) defined the common neighborhood matrix CN(G) and the common neighborhood energy Ecn(G) of a simple graph G. A graph G is called CN-hyperenergetic if Ecn(G)>Ecn(Kn), where n=|V(G)| and Kn denotes the complete graph on n vertices. Two graphs G and H with equal number of vertices are called CN-equienergetic if Ecn(G)=Ecn(H). In this paper we compute the common neighborhood energy of Γc(G) for several classes of finite non-abelian groups, including the class of groups such that the central quotient is isomorphic to group of symmetries of a regular polygon, and conclude that these graphs are not CN-hyperenergetic. We shall also obtain some pairs of finite non-abelian groups such that their commuting graphs are CN-equienergetic.

Nitrogen-doped carbons (NCs) as supports for metal catalysts used in heterogeneous reactions are increasingly being investigated. In this work, NCs were prepared from monosodium glutamate (MSG) by direct carbonization, which were used as supporters to prepare Bi/NC catalysts. The Bi/NC catalysts were characterized by X-ray powder diffraction (XRD), X-ray photoelectron spectroscopy (XPS), transmission electron microscope (TEM), and nitrogen adsorption isotherm. The results indicate that nitrogen was doped in the formation of pyridinic N, pyrrolic N, and graphitic N. The NCs possess high surface area (~652 m2/g) and uniform mesopore size (~2.11 nm). Bismuth nanoparticles (NPs) dispersed uniformly in NC with diameter of 10-20 nm. The catalytic performances were investigated using the reduction of 4-nitrophenol (4-NP) with excess potassium borohydride as a model reaction, the results indicating that the Bi/NC catalysts have higher activity and better reusability than the Bi/AC catalyst. Under the following conditions: 100 mL of 4-NP (2 mM), 0.03 g of 3%Bi/NC, n(KBH4) : n(4-NP) = 40:1, and at room temperature, the rate constant k can reach 0.31 min-1. Copyright © 2018 BCREC Group. All rights reservedReceived: 28th July 2017; Revised: 1st September 2017; Accepted: 7th September 2017; Available online: 22nd January 2018; Published regularly: 2nd April 2018How to Cite: Cai, K.Y., Zhou, Y.M., Wang, P., Li, H., Li, Y., Tao, W. (2018). Preparation of Nitrogen-Doped Carbon Materials from Monosodium Glutamate and Application in Reduction of p-Nitrophenol. Bulletin of Chemical Reaction Engineering & Catalysis, 13 (1): 89-96 (doi:10.9767/bcrec.13.1.1428.89-96)

Two-dimensional (2D) materials have gained great importance since the discovery of graphene. Of these several 2D materials, PbFCl and BaFCl, have not been exploited for electrochemical applications. Herein, we have prepared single and few-layered nanosheets of PbFCl and BaFCl by exfoliation through ultrasonication in different solvents such as water, dimethylformamide and N-methyl-2-pyrrolidone. The Hansen-Solubility-Parameters of the solvents played an important role in exfoliation of bulk phase of PbFCl and BaFCl. These materials were studied for supercapacitor properties by means of cyclic voltammetry (CV) curves, galvanostatic charge–discharge (GCD) curves and electrochemical impedance spectroscopy (EIS). Exfoliated 1–2 layered PbFCl exhibits a high-specific capacitance of 158 F g−1 at a scan rate of 10 mV s−1. References: - Geim, A. K. & Novoselov, K. S. The rise of graphene. Nat. Mater. 6, 183 (2007). Manjunath, K., Servottam, S., Soni, A. & Rao, C. N. R. A study of two-dimensional PbFCl and BaFCl. Bulletin of Materials Science 43, 1–7 (2020).

The reef tracts of Barbados have been investigated by electron spin resonance dating; all parameters necessary for ESR dating (including effective α-efficiency and thermal stability) were determined without cross checking with another independent dating method. In addition, some U-series analyses were carried out in order to test the reliability of ESR. In most cases, the results show a satisfactory agreement between ESR and both these and previously published U-series dates (M. L. Bender, R. G. Fairbanks, F. W. Taylor, R. K. Matthews, J. G. Goddard, and W. S. Broecker (1979). Geological Society of America. Bulletin 90 , 577–594). For the oldest samples, ESR dates tend to exceed He/U dates, suggesting that there might have been He loss from aragonite. Raised reef tracts are assigned to high sea stands from successive interglacial stages 5, 7, 9, 11, 13, and 15. ESR and U-series (230Th/234U) dates for corals and molluses in North Barbados do not support the suggestion of N. P. James ((1971). Unpublished Thesis, McGill University, Montreal) that this region has subsided during part of the past 125,000 yr. Whereas the experimentally determined mean life (τ) of trapped electrons is only 500,000 yr for the ambient temperature in Barbados, there is no evidence from the comparison between ESR and other dates for thermal fading. This emphasizes the difficulty of experimental measurement of τ.

Among Erymidae Van Straelen, 1925 (Van Straelen V. 1925. Contribution à l'étude des crustacés décapodes de la période jurassique. Mémoires de la Classe des Sciences de l'Académie royale de Belgique 7: 1–462), typical Mesozoic crustaceans, the genus Eryma Meyer, 1840 (Meyer H. von. 1840a. Briefliche Mittheilungen. Neues Jahrbuch für Mineralogie, Geognosie, Geologie und Petrefactenkunde 576–587) includes the largest number of species, mainly from Jurassic deposits. However, the lack of clear diagnoses for erymid genera has led to mistakes in generic assignments and to the establishment of redundant genera. The review of the concept of Eryma herein presents an attempt to clarify its diagnosis, mainly supported by the carapace groove pattern and the morphology of chelae of the first pair of pereiopods, and to emphasize its systematic implications. Thus, we maintain the synonymy of Klytia Meyer, 1840, Bolina Münster, 1839 (Münster G. 1839. Decapoda Macrura. Abbildung und Beschreibung der Fossilen Langschwänzigen Krebse in den Kalkschiefern von Bayern. Beiträge zur Petrefaktenkunde 2: 1–88) (sensu Étallon [Étallon A. 1859. Description des crustacés fossiles de la Haute-Saône et du Haut-Jura. Bulletin de la Société géologique de France 16: 169–205]), and Erymastacus Beurlen, 1928 (Beurlen K. 1928. Die Decapoden des Schwäbischen Jura mit Ausnahme der aus den oberjurassischen Plattenkalken stammenden. Palaeontographica 70: 115–278) with Eryma. Moreover, a review of the genera Protoclytiopsis Birshtein, 1958 (Birshtein JA. 1958. Ein Vertreter der ältesten Ordo der Crustacea Decapoda Protoclitiopsis antiqua gen. nov. sp. nov. aus dem Permo West-Sibiriens. Doklady Akademii Nauk, SSSR 122: 477–480), and Galicia Garassino and Krobicki, 2002 (Garassino A, Krobicki M. 2002. Galicia marianae n. gen., n. sp. (Crustacea, Decapoda, Astacidea) from the Oxfordian (Upper Jurassic) of the Southern Polish Uplands. Bulletin of the Mizunami Fossil Museum 29: 51–59), reveals the presence of a junction between the postcervical and branchiocardiac grooves. This feature is diagnostic of Eryma and supports the integration of these genera into the synonymy of Eryma. The addition of Protoclytiopsis to the synonymy of Eryma makes Eryma antiquum (Birshtein, 1958) nov. comb. the oldest representative of the genus and of the family, extending its stratigraphic range to the Late Permian (Changhsingian). Thus, this work also emphasizes that Erymidae crossed the Permian-Triassic boundary.

Проведено исследование фазовых равновесий в тройной системе Sn–As–P в области высокой концентрации летучих компонентов. Методами рентгенофазового и дифференциального термического анализа изучены сплавы политермического разреза SnAs–P. Показано, что растворимость фосфора в моноарсениде олова в направлении этого разреза менее 0.05 мол.д. фосфора. Построена Т-х диаграмма политермического сечения SnAs–Р. Наличие на Т-х диаграмме горизонтали при температуре 827±2 К соответствует реализации в системе Sn–As–P нонвариантного перитектического равновесия L + (d) ↔ b + g , где (d), b и g – трехкомпонентные твердые растворы на основе As1-xPx, SnAs и SnP3 соответственно REFERENCES Zhang W., Mao J., Li S., Chen Z., Guo Z. Phosphorus-Based Alloy Materials for Advanced Potassium-Ion Battery Anode // Am. Chem. Soc., 2017, v. 139(9), pp. 3316–3319. https://doi.org/10.1021/jacs.6b12185 Liu S., Zhang H., Xu L., Ma L., Chen X. Solvothermal preparation of tin phosphide as a long-life anode for advanced lithium and sodium ion batteries // of Power Sources, 2016, v. 304, pp. 346–353. https://doi.org/10.1016/j.jpowsour.2015.11.056 Zhang W., Pang W., Sencadas V., Guo Z. Understanding High-Energy-Density Sn4P3 Anodes for Potassium-Ion Batteries // Joule, 2018, v. 2(8), pp. 1534–1547. https://doi.org/10.1016/j.joule.2018.04022 Lan D., Wang W., Shi L., Huang Y., Hu L., Li Q. Phase pure Sn4P3 nanotops by solution-liquid-solid growth for anode application in sodium ion batteries // Mater. Chem. A, 2017, v. 5, pp. 5791–5796. https://doi.org/10.1039/C6TA10685D Mogensen R., Maibach J., Naylor A. J., Younesi R. Capacity fading mechanism of tin phosphide anodes in sodium-ion batteries // Dalton Trans., 2018, v. 47, pp. 10752–10758. https://doi.org/10.1039/c8dt01068d Kamali A. R., Fray D. J. Tin-based materials as advanced anode materials for lithium ion batteries: a review // Adv. Mater. Sci., 2011, v. 27, pp. 14–24. URL: http://194.226.210.10/e-journals/RAMS/no12711/kamali.pdf Kovnir K. A., Kolen’ko Y. V., Baranov A. I., Neira I. S., Sobolev A. V., Yoshimura M., Presniakov I. A., Shevelkov A. V. Sn4As3 revisited: Solvothermal synthesis and crystal and electronic structure // Journal of Solid State Chemistry, 2009, v. 182(5), pp. 630–639. https://doi.org/10.1016/j.jssc.2008.12.007 Semenova G. V., Kononova E. Yu., Sushkova T. P. Polythermal section Sn4P3 – Sn4As3 // Russian J. of Inorganic Chemistry, 2013, v. 58 (9), pp. 1242–1245. https://doi.org/10.7868/S0044457X13090201 Sushkova T. P, Semenova G. V., Naumov A. V., Proskurina E. Yu. Solid solutions in the system Sn-As-P // Bulletin of VSU. Series: Chemistry. Biology. Pharmacy, 2017, v. 3, pp. 30–36. URL: http://www. vestnik.vsu.ru/pdf/chembio/2017/03/2017-03-05.pdf Semenova G. V., Sushkova T. P, Tarasova L. A., Proskurina E. Yu. Phase equilibria in a Sn-As-P system with a tin concentration less than 50 mol. % // Condensed Matter and Interphases, 2017, v. 19(3), pp. 408–416. https://doi.org/10.17308/kcmf.2017.19/218 Semenova G. V., Sushkova T. P., Zinchenko E. N., Yakunin S. V. Solubility of phosphorus in tin monoarsenide // Condensed Matter and Interphases, 2018, v. 20(4), pp. 644-649. https://doi.org/10.17308/kcmf.2018.20/639 Semenova G. V., Goncharov E. G. Solid Solutions Involving Elements of the Fifth Group. – Мoscow, MFTI Publ., 2000, 160 p. (in Russ.) Okamoto H. Phase diagrams for binary alloys, Second Edition. Materials Park, OH.: ASM International, 2010, 810 р. URL: https://www.asminternational. org/...pdf/c36eeb4e-d6ec-4804-b319-e5b0600ea65d Shirotani , Shiba S., Takemura K., Shimomura О., Yagi Т. Pressure-induced phase transitions of phosphorus-arsenic alloys // Physica B: Condensed Matter, 1993, v. 190, pp. 169–176. https://doi.org/10.1016/0921-4526(93)90462-F Arita M., Kamo K. Measurement of vapor pressure of phosphorus over Sn-P alloys by dew point method // Jpn. Inst. Met., 1985, v. 26(4), pp. 242–250. https://doi.org/10.2320/matertrans1960.26.242 Zavrazhnov A. Yu., Semenova G. V., Proskurina E. Yu., Sushkova T. P. Phase diagram of the Sn–P system // Thermal Analysis and Calorimetry, 2018, v. 134(1), pp. 475–481. https://doi.orgh/10.1007/s10973-018-7123-0 Gokcen N. A. The As-Sn (Arsenic-Tin) system // Bulletin of alloy phase diagrams, 1990, v. 11(3), pp. 271–278. https://doi.org/10.1007/BF03029298

A microgravity investigation on bedrock topography was conducted at Maluri park reference level in Kuala Lumpur, Malaysia. The study aim to mapping the near-surface structure and soil and land cover distribution for geography and geophysics surveys. Two types of cross-section modeling of the residual anomaly generated the MaluriBouguer Anomaly model for site-1 and site-2 at Maluri Park. The 2D microgravity models produced the contour map, displaying the characterization due to density contrast in rock types while mapping the subsurface geological structure at different depths. Moreover, a synthetic model was initiated with the assumption of lateral distance on the left and right sides taken at 50 m and a depth of 60 m. The results of modeling confirmed that the soil and rock type composition on both models site tests are topsoil (1.1 to 1.92 g/cm3), soil (1.8 g/cm3), clay (1.63 g/cm3), gravel (1.7 g/cm3), sand (2.0 g/cm3), shale (2.4 g/cm3), sandstone (2.76 g/cm3), and limestone (2.9 g/cm3). The 2D gravity modeling using two model site tests obtained a correspondence with the observed microgravity data. Keywords: Bouguer anomaly, limestone, microgravity, soil structure, topography. References Amaluddin, L. O., Rahmat, R., Surdin, S., Ramadhan, M. I., Hidayat, D. N., Purwana, I. G., & Fayanto, S. (2019). The Effectiveness of Outdoor Learning in Improving Spatial Intelligence. Journal for the Education of Gifted Young Scientists, 7(3), 667–680. https://doi.org/10.17478/jegys.613987 Arisona,A., Mohd N., Amin E.K., &Abdullahi, A.(2018).Assessment of microgravity anomalies of soil structure for geotechnical 2d models.Journal of Geoscience, Engineering, Environment, and Technology (JGEET)3(3), 151-154. Georgsson, L.S. (2009). Geophysical Methotds Used in Geothermal Exploration. Presented at Exploration for Geothermal Resources, 1-22 November 2009, 1-16. Grandjean, G. (2009). From Geophysical Parameters to Soil Characteristics.Florida: Report N°BRGM/FP7-DIGISOIL Project Deliverable 2.1, Final ReportDepartment of Civil and Coastal EngineeringUniversity of Florida. Hiltunen, D.R., Hudyma,N.,Tran,K.T.,&Sarno,A.I. (2012).Geophysical Testing of Rock and Its Relationthipsto Physical Properties.Florida:Final ReportDepartment ofCivil and Coastal EngineeringUniversity ofFlorida. Kirsch,R. (2006).GroundwaterGeophysics, ATool for Hydrogeology.New York: Springer. Kamal,H.,Taha,M.,&Al-Sanad,S. (2010). Geoenvironmental Engineering and Geotechnics, GeoShanghai 2010 International Conference. (accessed 02.03.17) Lilie, R.J. (1999).Whole Earth Geophysics: An Introductory Textbook for Geologists and Geophysicists. New Jersey:Prentice-HallInc. Pringle, J.K., Styles, P., Howell, C.P.,Branston, M.W., Furner, R., &Toon,S.M. (2012). Long-term time-lapse microgravity and geotechnical monitoring of relict salt mines, marston, cheshire, uk. Geophysic77(6), 165-171. Samsudin, H.T.(2003).A microgravity survey over deep limestone bedrock.Bulletin of Geological Society of Malaysia4(6), 201-208. Tan, S.M. (2005). Karsticfeatures of kualalumpur limestone. Bulletin of the Institution of EnginnerMalaysia 4(7), 6-11. Tajuddin, A.&Lat, C.N. (2004).Detecting subsurfacevoids using the microgravity method, a case study from kualalipis, pahang.Bulletin of Geological Society of Malaysia 3(48), 31-35. Tuckwell, G., Grossey, T., Owen, S., & Stearns, P. (2008). The use of microgravity to detect small distributed voids and low-density ground. Quarterly Journal of Engineering Geology and Hydrogeology, 41(3), 371–380. https://doi.org/10.1144/1470-9236/07-224 Wanjohi, A.W. (2014). Geophysical Field Mapping. Presented at Exploration for Geothermal Resources, 2-23 November 2014, 1-9. Yusoff , Z.M., Raju,G. &Nahazanan, H.(2016).Static and dynamic behaviour of kualalumpur limestone. Malaysian Journal of Civil Engineering Special Issue Vol.28 (1), p.:18-25. Zabidi, H. & De Freitas, M.H. (2011).Re-evaluation of rock core logging for the prediction of preferred orientations of karst in the kualalumpur limestone formation. Engineering Geology, 117(3-4), p.: 159–169. Copyright (c) 2019 Geosfera Indonesia Journal and Department of Geography Education, University of Jember This work is licensed under a Creative Commons Attribution-Share A like 4.0 International License

In the present work, several parameters affecting on the catalytic behavior were studied in the process of partial oxidation of methanol to formaldehyde, such as: Mo/Fe ratio in unsupported catalysts, weight percent of the metallic phase in the supported catalysts, the effect of different supports, the method of Mo-Fe deposition on the supports, and the stability of the prepared catalysts against coke. These catalysts were characterized by X-ray diffraction (XRD), Fourier Transform Infra Red (FT-IR), Thermogravimetric Analysis (TGA), Scanning Electron Microscopy (SEM), N2 adsorption-desorption, and Atomic Adsorption Spectroscopy (AAS) methods. The best results (the methanol conversion = 97 % and formaldehyde selectivity = 96 %) were obtained for Mo-Fe/g-Al2O3 prepared by co-precipitation method with Mo/Fe = 1.7, 50 wt.% of Fe-Mo phase, 2 mL/h methanol flow rate, and 120 mL/min air flow rate at 350 oC. Copyright © 2018 BCREC Group. All rights reservedReceived: 1st January 2018; Revised: 17th July 2018; Accepted: 24th July 2018How to Cite: Peyrovi, M.H., Parsafard, N., Hasanpour, H. (2018). Catalytic Study of the Partial Oxidation Reaction of Methanol to Formaldehyde in the Vapor Phase. Bulletin of Chemical Reaction Engineering & Catalysis, 13 (3): 520-528 (doi:10.9767/bcrec.13.3.2048.520-528)Permalink/DOI: https://doi.org/10.9767/bcrec.13.3.2048.520-528

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