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    Wyświetlanie 1-14 z 14
    Tytuł:
    Simultaneous extraction of vanadium and chromium from vanadium slag using low-pressure liquid phase oxidation method
    Autorzy:
    Xia, J.-P.
    Zheng, S.-L.
    Wang, S.-N.
    Liu, B.
    Zou, X.
    Powiązania:
    https://bibliotekanauki.pl/articles/110818.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    vanadium slag
    low pressure leaching
    liquid phase oxidation
    kinetics
    Opis:
    A low-pressure liquid oxidation method was proposed and proven to be effective to extract vanadium and chromium simultaneously from the vanadium slag in concentrated NaOH aqueous solutions. The effect of temperature, NaOH mass concentration, liquid-to-solid mass ratio, stirring speed and pressure on the extraction of vanadium and chromium in NaOH aqueous solutions were systematically investigated. Under the optimal reaction conditions (temperature of 473 K, liquid-to-solid mass ratio of 6:1, stirring speed of 700 rpm, NaOH mass concentration of 50%, pressure of 1 MPa and reaction time of 180 min), the vanadium and chromium recovery reached 95% and 90%, respectively. It was found that the reaction temperature and NaOH concentration were important factors for the extraction of vanadium and chromium. The kinetics of the decomposition of vanadium slag in concentrated NaOH aqueous under low pressure was analyzed using the shrinking core model, and the results indicated that the extraction of vanadium and chromium were both governed by the internal diffusion step, with apparent activation energies calculated to be 26.22 and 32.79 kJ/mol, respectively.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2018, 54, 2; 609-619
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparative Theoretical Investigation on Energetic Substituted Furazanyl Ethers
    Autorzy:
    Liu, N.
    Wang, K.
    Shu, Y.
    Zeman, S.
    Wang, B.
    Wang, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/358622.pdf
    Data publikacji:
    2018
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    furazanyl ethers
    heats of formation
    bond dissociation energy
    detonation performance
    melting point
    Opis:
    Furazanyl ether has great potential to be an important candidate as a casting explosive and energetic plasticizer. The density functional theory (DFT) method was used to investigate the heats of formation (HOFs), molecular stability, detonation performance and melting point of a series of substituted furazanyl ethers at B3LYP/6-311G(d,p) level. The results show that the introduction of –N3 or –N(O)=N– groups significantly improves the HOFs values of the derivatives. The bond dissociation energies (BDEs) were analyzed, showing that the N–O bond in the furazan ring is the weakest for most compounds and the ring is vulnerable to cleavage in thermal decomposition. The calculation of density, detonation velocities and detonation pressures suggests that the substitution of –NF2, –CF(NO2)2, furoxan or –N(O)=N– group is an effective method for enhancing their detonation performance. The melting points were determined according to the variation of specific heat capacity, and good estimates were obtained in comparison with the available experimental data. Taking into account the detonation performance and melting point, four compounds are favoured for application in melt cast explosive or energetic plasticizers.
    Źródło:
    Central European Journal of Energetic Materials; 2018, 15, 1; 47-71
    1733-7178
    Pojawia się w:
    Central European Journal of Energetic Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of tripping velocity profiles on wellbore pressures and dynamic loading of drillstring
    Autorzy:
    Wang, Z.
    Miska, S.
    Yu, M.
    Takach, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/298649.pdf
    Data publikacji:
    2013
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    trapping velocity
    optimization
    Opis:
    Tripping events are expensive and time-consuming. Thus, minimizing tripping time through choosing optimized tripping velocity becomes urgent. Surge or swab pressures in the wellbore and dynamic loading of drillstring will be generated during tripping. Also, dynamic velocity, which is the velocity at the bottom of drillstring, is different from the input velocity at surface. The effect of tripping velocity profile, i.e., tripping velocity changes with time, on the hook load, downhole pressure changes and drillstring dynamic velocity should be fully studied to achieve the optimization. In this study, the effects of tripping velocity profile on loading of drillstring, dynamic velocity and downhole pressure is investigated using numerical simulation. Bergeron's graphical method and Lubinski's approach are utilized to perform the simulations. Components of drillstring, wellbore depth, drillstring length and mud properties are also included in the simulations. Through the current work, a driller's typical way of changing tripping velocity may not be the best one. Selection of tripping velocity profiles should be adapted to depth: higher velocity, triangular/parabolic profiles in shallow wells and lower velocity, trapezoidal profiles in deep wells. Also, based on simulations, the oscillation magnitude of dynamic velocity can be as high as twice that of velocity at surface.
    Źródło:
    AGH Drilling, Oil, Gas; 2013, 30, 1; 269-286
    2299-4157
    2300-7052
    Pojawia się w:
    AGH Drilling, Oil, Gas
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optimum design of fiber angle and hole orientation of an orthotropic plate
    Autorzy:
    Zhang, X.
    Lu, A.
    Wang, S.
    Zhang, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/280011.pdf
    Data publikacji:
    2018
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    orthotropic plate
    fiber orientation angle
    hole orientation angle
    conformal transformation method
    differential evolution algorithm
    Opis:
    With the goal of decreasing the stress concentration along the hole boundary in an orthotropic plate under inequi-biaxial loadings, an optimum design of the fiber angle and hole orientation is presented. The maximum absolute tangential stress along the hole boundary is taken as the objective function, and the fiber orientation angle and the hole orientation angle are considered as design variables. The conformal transformation method of a complex function and the Differential Evolution (DE) algorithm are used. Two non-circular shapes, ellipse and hexagon are taken as examples to analyze the problem. Based on the results, we can conclude that the major axis of elliptical holes should be designed in the direction of the maximum external loading for a perforated structure in an orthotropic plate. However, the principal direction that has the larger Young’s modulus should be inclined to the direction of the minimum loading, especially for a significantly orthotropic plate.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2018, 56, 1; 297-311
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Automated approach to classification of mine-like objects using multiple-aspect sonar images
    Autorzy:
    Wang, X.
    Liu, X.
    Japkowicz, N.
    Matwin, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/91790.pdf
    Data publikacji:
    2014
    Wydawca:
    Społeczna Akademia Nauk w Łodzi. Polskie Towarzystwo Sieci Neuronowych
    Tematy:
    object
    sea bed
    multiple side-scan sonar
    Dempster-Shafer theory
    DS concept
    classifier
    imbalance
    imbalanced problem
    multi-instance class
    Opis:
    In this paper, the detection of mines or other objects on the seabed from multiple side-scan sonar views is considered. Two frameworks are provided for this kind of classification. The first framework is based upon the Dempster–Shafer (DS) concept of fusion from a single-view kernel-based classifier and the second framework is based upon the concepts of multi-instance classifiers. Moreover, we consider the class imbalance problem which is always presents in sonar image recognition. Our experimental results show that both of the presented frameworks can be used in mine-like object classification and the presented methods for multi-instance class imbalanced problem are also effective in such classification.
    Źródło:
    Journal of Artificial Intelligence and Soft Computing Research; 2014, 4, 2; 133-148
    2083-2567
    2449-6499
    Pojawia się w:
    Journal of Artificial Intelligence and Soft Computing Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The characteristics of radon and thoron concentration from soil gas in Shenzhen City of Southern China
    Autorzy:
    Wang, N.
    Zheng, L.
    Chu, X.
    Li, S.
    Yan, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/148789.pdf
    Data publikacji:
    2016
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    222Rn/220Rn
    soil gas
    radon mapping
    China
    Opis:
    Radon (222Rn) and thoron (220Rn) from soil gas are very significant factors that can affect the indoor radon level in the first floor or in the basement. China is one of the countries with the highest thorium content in the world. Therefore, it is very significant to study 222Rn/220Rn concentration in the soil in Shenzhen City (SC). A 222Rn/220Rn survey was performed using a portable radon monitor (model RAD7) at 69 sites, covered a total area of 1800 km2 in 2013 to get the original data for radon risk estimation in SC. The average values of 222Rn and 220Rn concentration of soil gas of the total 69 locations are 86 ± 72 kBq•m–3 and 118 ± 85 kBq•m–3, respectively. 222Rn/220Rn concentrations are related to geological lithology. 222Rn concentrations vary from 40 to 370 kBq•m–3 and from 15 to 118 kBq•m–3 in weathered granite products and sediments, respectively, while 220Rn concentrations are from 103 to 435 kBq•m–3 and 2.2 to 96 kBq•m–3. The higher 220Rn values were mainly observed at the sites covered by the weathered granite products. Comparing with the areas of high 222Rn concentration, the areas of high 220Rn values are larger. The distribution of 222Rn concentration in the vertical direction displays an exponential distribution mode, but there is no rule of 220Rn concentration. The investigation suggests that people should pay attention to 220Rn contribution in the radon mapping of SC, as well as in the indoor radon survey.
    Źródło:
    Nukleonika; 2016, 61, 3; 315-319
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Tensile-tensile Fatigue Behavior of Multi-axial Warp-knitted Reinforced Composite
    Ocena właściwości mechanicznych i zmęczeniowych kompozytowych dzianin wieloosiowych
    Autorzy:
    Gao, X.
    Tao, N.
    Chen, S.
    Wang, L.
    Wu, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/232142.pdf
    Data publikacji:
    2018
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
    Tematy:
    multi-axial warp-knitted fabric composite
    fatigue behavior
    S-N curve
    equivalent residual strength
    kompozytowe dzianiny wieloosiowe
    zmęczenie materiału
    krzywa S-N
    równoważna wytrzymałość resztkowa
    Opis:
    An experimental study was carried out on the fatigue behaviour of multi-axial warp-knitted fabric composites. Composite samples reinforced with multi-axial warp-knitted fabric/matrix were manufactured by the vacuum-assisted resin transfer moulding method. Tensile-tensile fatigue cycling was carried out at different load levels, and S-N curves, tensile stress-strain curve and stiffness degradation of the multi-axial composite samples were obtained. Finally post-fatigue tensile tests were done at a stress level of 75%, at the stages of 1/3N and 2/3N, and the equivalent residual strength and stiffness degradation were obtained.
    Dokonano oceny właściwości mechanicznych i zmęczeniowych kompozytowych dzianin wieloosiowych. Kompozyty wzmocnione dzianiną wieloosiową wytworzono przy zastosowaniu próżniowej metody formowania. Dokonano oceny zmęczenia materiału i właściwości wytrzymałościowych przy różnych poziomach obciążenia. Przedstawiono krzywe S-N, krzywą naprężenie-odkształcenie i degradację sztywności wieloosiowych próbek kompozytowych. Wykonano również testy zmęczenia materiału przy poziomie naprężenia 75%, w etapach 1/3N i 2/3N. Omówiono równoważną wytrzymałość szczątkową i degradację sztywności kompozytowych dzianin wieloosiowych.
    Źródło:
    Fibres & Textiles in Eastern Europe; 2018, 1 (127); 73-80
    1230-3666
    2300-7354
    Pojawia się w:
    Fibres & Textiles in Eastern Europe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Active fault tolerance control of a wind turbine system using an unknown input observer with an actuator fault
    Autorzy:
    Li, S.
    Wang, H.
    Aitouche, A.
    Tian, Y.
    Christov, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/329822.pdf
    Data publikacji:
    2018
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    wind turbine system
    linear parameter varying system
    fault tolerant control
    unknown input observer
    elektrownia wiatrowa
    sterowanie tolerujące uszkodzenia
    obserwator wejściowy
    Opis:
    This paper proposes a fault tolerant control scheme based on an unknown input observer for a wind turbine system subject to an actuator fault and disturbance. Firstly, an unknown input observer for state estimation and fault detection using a linear parameter varying model is developed. By solving linear matrix inequalities (LMIs) and linear matrix equalities (LMEs), the gains of the unknown input observer are obtained. The convergence of the unknown input observer is also analysed with Lyapunov theory. Secondly, using fault estimation, an active fault tolerant controller is applied to a wind turbine system. Finally, a simulation of a wind turbine benchmark with an actuator fault is tested for the proposed method. The simulation results indicate that the proposed FTC scheme is efficient.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2018, 28, 1; 69-81
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental and mathematical investigations on unconfined compressive behaviour of costal soft soil under complicated freezing processes
    Autorzy:
    Wang, W.
    Li, N.
    Zhang, F.
    Zhou, A.
    Chi, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/259246.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    costal soft soil
    stress-strain curve model
    unconfined compressive behavior
    freezing-thawing circle
    Opis:
    In order to properly understand the effect of freezing-thawing circle (FTC) to mechanical behavior of costal soft soil (CSS), unconfined compressive test is conducted. Six kind FTC times are designed from zero to five. The tested data show that: (1) unconfined compressive strength of CCS decreases nonlinearly with more FTC, and the strength after five FTC times becomes about 22% of its original strength without any freezing-thawing experience; (2) stressstrain curves of all unconfined compressive samples can be well fitted by three-parameter hyperbolic model; (3) and relationship between two parameters and FTC times can be fitted by exponent function, while another parameter can be considered as 0.95. Consequently, one composite hyperbolic- exponent empirical formula is established in order to describe freezing-thawing-dependent stress-strain behavior of CSS. Finally, good agreements have been found between tested dada and simulated results.
    Źródło:
    Polish Maritime Research; 2016, 4; 112-116
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Features of distribution of uranium and thorium in red mud
    Autorzy:
    Gu, H.
    Wang, N.
    Yang, Y.
    Zhao, C.
    Cui, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/110444.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    red mud
    uranium
    thorium
    distribution
    perovskite
    Opis:
    Natural radioactive elements such as uranium and thorium restrict the use of red mud as building materials or additives, and may cause environmental problems. The distribution features of U and Th in red mud was studied from micro and macro analysis, using EPMA, LA-ICP-MS, and methods of mineralogy and beneficiation. Based on the micro-area scanning analysis, main chemical compositions in red mud, such as Ca, Al, Si, Na, and K are dispersive while Fe and Ti mainly tend to concentrate in granular phases. Based on the in-situ analysis, the distribution of main elements and most trace elements in micro-zone of red mud was homogeneous. In micro-zone area, the variation tendency of thorium content was similar with Y in red mud samples. By means of the methods of mineralogy and beneficiation, red mud samples were separated into different fractions. U and Th tend to be enriched in the low density fraction of the red mud. Th presented a high concentration in the finest particle size fractions of the red mud. Neither U or Th was regularly distributed in various magnetic red mud fractions. Thorium fingerprint peaks were determined in perovskite by EDX under TEM, which is proposed to be one of the radioactivity sources in Bayer red mud.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2017, 53, 1; 110-120
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mineralizacja polimetaliczna z kopalni Beiyi w okręgu rud żelaza Shilu na wyspie Hajnan w południowych Chinach
    The polymetallic mineralization from the Beiyi mine, Shilu iron ores district, Hainan Island (Southern China)
    Autorzy:
    Mikulski, S.Z.
    Bakun-Czubarow, N.
    Xu, D.
    Wang, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/2062063.pdf
    Data publikacji:
    2012
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    kruszce
    rudy siarczkowe miedzi i kobaltu
    rudy żelaza
    amalgamat Ag-Hg
    analizy w mikroobszarze
    kopalnia Beiyi
    złoże Shilu
    Wyspa Hajnan
    Chiny
    ore mineralogy
    ores
    copper-cobalt sulfides
    iron oxide
    Ag-Hg amalgamate
    microprobe analyses
    Beiyi mine
    Shilu deposit
    Hainan Island
    China
    Opis:
    W regionie górniczym Shilu posiadającym olbrzymie zasoby rud żelaza typu BIF (Banded Iron Formation), oprócz mineralizacji tlenkami Fe (głównie hematyt), występuje lokalnie w spągu 6 poziomu stratygraficznego grupy Shilu, bogata polimetaliczna mineralizacja siarczkowa Cu–Co. W regionie górniczym Shilu występują słabo zmetamorfizowane skały wulkanoklastyczne i węglanowe zaliczane do mezo- i neoproterozoiku, w które intrudowały różnego wieku granitoidy. Przedmiotem badań mikroskopowych w świetle odbitym i w mikroskopie elektronowym CAMECA SX 100, wyposażonym w przystawkę EDS i WDS, była polimetaliczna mineralizacja kruszcowa z kopalni Beiyi i jej okolic. Mineralizacja kruszcowa, głównie pirotynowo-chalkopirytowa oraz kobaltonośny piryt (do ok. 11% wag. Co), występuje w zmienionych skałach węglanowo-krzemianowych i silnie okwarcowanych skałach diopsydowo-tremolitowych w postaci impregnacji, żyłek i masywnych agregatów ziarnistych. Pirotyn i chalkopiryt zawierają liczne wrostki oraz tworzą przerosty z innymi minerałami (sfaleryt, galena, glaukodot, costibit, kobaltyn, arsenopiryt, ullmannit, siegenit, tytanit, Co-bravoit i kasyteryt). Niewielkie kryształy (10–20 μm średnicy) tworzą minerały Bi (matyldyt i cosalit) i argentyt. W paragenezie z barytem, kalcytem i chlorytem pojawiają się amalgamaty Ag–Hg oraz cynober. Wyniki prac pozwoliły rozpoznać nowe, dotychczas nieopisywane ze złoża minerały. Rezultaty badań wskazują na krystalizację minerałów kruszcowych podczas 4–5 oddzielnych etapów precypitacji kruszców z roztworów hydrotermalnych, w zakresie od temperatur średnich do niskich. Wstępne wyniki oznaczeń wieku izotopowego metodą Re–Os młodszej generacji pirytów (pozbawionych domieszek kobaltu) wskazują na ich precypitację w interwale 240–260 mln lat.
    The famous Shilu iron-polymetallic ore mining district located in western Hainan Island, South China, occurs within Meso- and Neoproterozoic low-grade metamorphosed volcanoclastics and carbonates, that belong to the 6th sequence of the Shilu Group. Granitoid intrusions of different ages occur in the surroundings of the mining area. The Shilu deposit is considered to be a structurally reworked as well as hydrothermally altered and enriched ore deposit of a Banded Iron Formation type. The deposit is a very important iron producer from hematite (and minor magnetite) ores. Our work focused on the polymetallic sulfide mineralization that underlies the iron oxide ores. We selected several samples of sulfide ores from the Shilu deposit of the Beiyi mine and its close vicinity. We performed detailed ore microscopic studies as well as electron microprobe analyses using the CAMECA SX 100 equipped with EDS and WDS systems. Pyrrhotite, chalcopyrite and Co-bearing pyrite (up to 11 wt% Co) dominated among ore sulfides in the studied samples. These ore minerals occur in calc-silicate rocks and strongly silicified diopside, tremolite-bearing rocks, either as disseminated grains, sometimes in veinlets, or in aggregates that may form massive ores. Pyrrhotite and chalcopyrite may contain numerous solid inclusions, overgrowths and intergrowths of subordinate sulfides (sphalerite, galena), sulfosalts (glaucodot, costibite, cobaltite, arsenopyrite, ullmannite), sulfospinels (siegenite) and cassiterite that belong to the minerals crystallizing at medium to low temperatures. Among these minerals, siegenite and Co-bravoite dominate. Tiny crystals (10–20 μm in size) of Bi-minerals (matildite, cosalite) and argentite are also present. Moreover, in association with barite, calcite and chlorite, Ag-Hg amalgamate and cinnabar can occur. The results of our study point to the multistage medium- to low-temperature hydrothermal precipitation of ore sulfides during 4–5 separate stages. Preliminary results of Re-Os isotope datings indicate that pyrites of younger generation (lack of significant Co admixture) crystallized during 240–260 Ma.
    Źródło:
    Biuletyn Państwowego Instytutu Geologicznego; 2012, 452; 181--197
    0867-6143
    Pojawia się w:
    Biuletyn Państwowego Instytutu Geologicznego
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Synthesis, Structure and Energetic Properties of a Catenated N6, Polynitro Compound: 1,1’-Azobis(3,5-dinitropyrazole)
    Autorzy:
    Li, Y.-N.
    Shu, Y.-J.
    Wang, Y.-L.
    Wang, B.-Z.
    Zhang, S.-Y.
    Bi, F.-Q.
    Powiązania:
    https://bibliotekanauki.pl/articles/358573.pdf
    Data publikacji:
    2017
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    energetic compound
    1,1’-azobis(3,5-dinitropyrazole)
    synthesis
    energetic properties
    Opis:
    A nitrogen-rich, polynitro energetic compound with an N,N-azo linkage, 1,1’-azobis(3,5-dinitropyrazole) (ABDNP), has been synthesized by an oxidative coupling reaction of 1-amino-3,5-dinitropyrazole with different oxidizing agents. The target compound was characterized by IR spectroscopy, 1H and 13C nuclear magnetic resonance spectroscopy, elemental analysis, mass spectra, X-ray diffraction and differential scanning calorimetry (DSC). The DSC results show that 1,1’-azobis(3,5-dinitropyrazole) decomposes at a relatively high onset temperature (202.9 °C), which indicates that 1,1’-azobis(3,5-dinitropyrazole) has acceptable thermal stability. The energetic properties were obtained, with a measured density and heat of formation matched by theoretically computed values based on the B3LYP method.
    Źródło:
    Central European Journal of Energetic Materials; 2017, 14, 2; 321-335
    1733-7178
    Pojawia się w:
    Central European Journal of Energetic Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Synthesis and Property of 1,4-Diamino-3,6- dinitropyrazolo[4,3-c]pyrazole and Its Derivatives
    Autorzy:
    Li, Y.-N.
    Wang, B.-Z.
    Shu, Y.-J.
    Zhang, S.-Y.
    Lian, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/358674.pdf
    Data publikacji:
    2016
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    3,6-dinitropyrazolo[4,3-c]pyrazole (DNPP)
    1,4-diamino-3,6- dinitropyrazolo[4,3-c]pyrazole (DADNP)
    4,4’-(triaz-1-ene-1,3-diyl)bis(1- amine-3,6-dinitropyrazolo[4,3-c]pyrazole) (TBADNP)
    N-amination reaction
    synthesis
    property
    Opis:
    A synthetic procedure has been developed for the synthesis of 1,4-diamino- 3,6-dinitropyrazolo[4,3-c]pyrazole (DADNP) via N-amination reaction. Its derivatives, 4,4’-(triaz-1-ene-1,3-diyl)bis(1-amine-3,6-dinitropyrazolo[4,3-c] pyrazole) (TBADNP) and 1,4-dinitramino-3,6-dinitropyrazolo[4,3-c]pyrazole (DNADNP), were first designed and synthesized by the diazotization and nitrification of amino group, and their structures were characterized by IR, 1H NMR, 13C NMR, elementary analysis and MS. The thermal properties of target compounds were studied by means of differential scanning calorimetry (DSC) and thermogravimetry (TG). The thermal decomposition peak temperatures of DADNP, TBADNP and DNADNP are 227, 236 and 288 °C, respectively. Results show that the derivatives of 1,4-diamino-3,6-dinitropyrazolo[4,3-c]pyrazole have better thermal stability.
    Źródło:
    Central European Journal of Energetic Materials; 2016, 13, 2; 321-331
    1733-7178
    Pojawia się w:
    Central European Journal of Energetic Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Demonstration of a new indicator for studying upwelling in the Northern South China Sea
    Autorzy:
    Lin, L.
    Wang, Y.-S.
    Sun, C.-C.
    Li, N.
    Wang, H.
    Mitchell, B.G.
    Wu, M.-L.
    Song, H.
    Wu, J.-F.
    Powiązania:
    https://bibliotekanauki.pl/articles/48889.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    China Sea
    cluster analysis
    multivariate statistical analysis
    principal component analysis
    remote sensing
    satellite monitoring
    sea surface temperature
    silicate
    spatial distribution
    upwelling
    Opis:
    In order to demonstrate that silicate (SiO3-Si) can be used as an indicator to study upwelling in the northern South China Sea, hierarchical cluster analysis (CA) and principle component analysis (PCA) were applied to analyse the metrics of the data consisting of 14 physical-chemical-biological parameters at 32 stations. CA categorized the 32 stations into two groups (low and high nutrient groups). PCA was applied to identify five Principal Components (PCs) explaining 78.65% of the total variance of the original data. PCA found important factors that can describe nutrient sources in estuarine, upwelling, and non-upwelling areas. PC4, representing the upwelling source, is strongly correlated to SiO3-Si. The spatial distribution of silicate from the surface to 200 m depth clearly showed the upwelling regions, which is also supported by satellite observations of sea surface temperature.
    Źródło:
    Oceanologia; 2011, 53, 2
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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