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  • 1
    Online Resource
    Online Resource
    Solid-State NMR in Zeolite Catalysis. (2019)
    Singapore :Springer Singapore Pte. Limited,
    Details
    Keywords: Electronic books.
    Type of Medium: Online Resource
    Pages: 1 online resource (267 pages)
    Edition: 1st ed.
    ISBN: 9789811369674
    Series Statement: Lecture Notes in Chemistry Series ; v.103
    URL: https://ebookcentral.proquest.com/lib/geomar/detail.action?docID=5771924
    Language: English
    Note: Intro -- Preface -- Contents -- 1 Solid-State NMR Principles and Techniques -- 1.1 Introduction -- 1.2 Nuclear Spin Interactions in Solids -- 1.2.1 Chemical Shift Interaction -- 1.2.2 Dipole-Dipole Interaction -- 1.2.3 Quadrupolar Interaction -- 1.2.4 Spin-Spin Interaction -- 1.3 Manipulations of Spin Interactions in Solids -- 1.3.1 Magic-Angle Spinning (MAS) -- 1.3.2 Cross-Polarization -- 1.3.3 Dipolar Decoupling Methods in Rotating Solid -- 1.3.4 Dipolar Recoupling Methods in Rotating Solid -- 1.3.5 High-Resolution Techniques for Half-Integer-Spin Quadrupolar Nuclei -- 1.3.6 Summary -- References -- 2 Solid-State NMR Studies of Zeolites and Zeotype Materials Synthesis -- 2.1 Introduction -- 2.2 Zeolite Synthesis Route and Procedures -- 2.3 Zeolite Synthesis Process and Crystallization Mechanism -- 2.4 NMR Strategy in Characterization of Zeolite Synthesis -- 2.4.1 Microporous Aluminosilicates -- 2.4.2 Microporous Aluminophosphates -- 2.5 Summary -- References -- 3 Solid-State NMR Characterization of Framework Structure of Zeolites and Zeotype Materials -- 3.1 Introduction -- 3.2 Solid-State NMR Characterization of Zeolite Framework Structure -- 3.2.1 27Al MAS NMR -- 3.2.2 29Si MAS NMR -- 3.2.3 31P MAS NMR -- 3.2.4 17O MAS NMR -- 3.2.5 129Xe NMR -- 3.2.6 Other Framework Elements -- 3.3 Summary -- References -- 4 Solid-State NMR Characterization of Host-Guest Interactions -- 4.1 Introduction -- 4.2 Solid-State NMR Characterization of Host-Guest Interactions -- 4.2.1 Host-Guest Interaction Between Adsorbed Molecule and Zeolite Framework -- 4.2.2 Host-Guest Interaction in Molecular Sieve Synthesis -- 4.2.3 Host-Guest Interaction in Zeolite Catalysis -- 4.3 Summary -- References -- 5 Solid-State NMR Characterization of Acid Properties of Zeolites and Solid Acid Catalysts -- 5.1 Introduction -- 5.2 Solid-State NMR Characterization of Acidic Property. , 5.2.1 Acid Sites Containing Hydroxyl Groups -- 5.2.2 Acidic Nature and Strength -- 5.2.3 Location and Distribution of Acid Sites -- 5.2.4 Spatial Proximities and Synergy Effects of Different Acid Sites -- 5.3 Summary -- References -- 6 In Situ Solid-State NMR Investigation of Catalytic Reactions on Zeolites -- 6.1 Introduction -- 6.2 In Situ Solid-State NMR Approaches -- 6.2.1 Batch Reaction -- 6.2.2 Flow Reaction -- 6.3 Mechanistic Study of the Catalytic Reactions by In Situ NMR -- 6.3.1 Activation and Conversion of Light Alkanes -- 6.3.2 Methanol-to-Olefins (MTO) Conversion -- 6.4 Summary -- References -- Index.
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  • 2
    Online Resource
    Online Resource
    Spatial Data Handling in Big Data Era : Select Papers from the 17th IGU Spatial Data Handling Symposium 2016 (2017)
    Singapore : Springer
    Details Availability
    Keywords: Earth sciences ; Data structures (Computer science) ; Data mining ; Geographical information systems ; Geography
    Description / Table of Contents: This proceedings volume introduces recent work on the storage, retrieval and visualization of spatial Big Data, data-intensive geospatial computing and related data quality issues. Further, it addresses traditional topics such as multi-scale spatial data representations, knowledge discovery, space-time modeling, and geological applications. Spatial analysis and data mining are increasingly facing the challenges of Big Data as more and more types of crowd sourcing spatial data are used in GIScience, such as movement trajectories, cellular phone calls, and social networks. In order to effectively manage these massive data collections, new methods and algorithms are called for. The book highlights state-of-the-art advances in the handling and application of spatial data, especially spatial Big Data, offering a cutting-edge reference guide for graduate students, researchers and practitioners in the field of GIScience
    Type of Medium: Online Resource
    Pages: Online-Ressource (XIII, 237 p. 84 illus, online resource)
    ISBN: 9789811044243
    Series Statement: Advances in Geographic Information Science
    URL: https://doi.org/10.1007/978-981-10-4424-3
    DOI: 10.1007/978-981-10-4424-3
    Language: English
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  • 3
    Electronic Resource
    Electronic Resource
    Isolation and Structure of Cephalostatins 10 and 11 (1994)
    s.l. : American Chemical Society
    Journal of natural products 57 (1994), S. 52-63 
    Details
    ISSN: 1520-6025
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/np50103a007
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  • 4
    Electronic Resource
    Electronic Resource
    The MSMT Process for Semi-Solid Slurry Production (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 141-143 (July 2008), p. 421-426 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: A new slurry making method for rheocasting termed “Melt Spreading and MixingTechnique” (MSMT), based on forced uniform solidification theory, has been proposed, by whichthe bulk metal is dispersed into thin liquid film that is cooled rapidly and uniformly to allowcopious nucleation. With a model alloy Al-wt%6.5Si to conduct a series of experiments, feasibilityof this method and influence of process parameters upon slurry microstructure were studied. Theresults show that semisolid slurry for mass production with uniformly fine nondendriticmicrostructures can be obtained consistently and continuously by optimizing process parameters
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/24/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.141-143.421.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Numerical Simulation of Mould Filling in Rheocasting Process of Semisolid A356 Aluminum Alloy (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 141-143 (July 2008), p. 599-604 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: The apparent viscosity model of the semi-solid A356 aluminum alloy, based on fitting ofexperimental data obtained by the Couette type viscometer, was developed in the paper. Thecommercial package CastSoft6.0 coupled with the model was used to simulate the mould filling of thesemi-solid A356 aluminum alloy in the key-shaped component with iron cores. The simulation resultsshowed that the position of the iron cores has an important effect on the filling of the semisolid slurry,and it is easy to obtain the completely filled key-shaped component when the iron cores were near tothe inlet. The filling tests verified that the simulation results have good agreement with theexperimental results. The fitting results indicated that the developed apparent viscosity model ispractical and feasible and it can be used to simulate the mould filling process of the semisolid A356aluminum alloy slurry. Also the parameters were optimized and the optimum parameters are asfollows: the inject pressure is more than 15MPa, the inlet velocity is more than 1.73m/s and theforming temperature is over 585 °C
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/24/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.141-143.599.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Development of Rheo-Diecasting of Al-Si Alloys Based on a Modified DSCP Process (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 141-143 (July 2008), p. 185-190 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: An advanced rheo-diecasting technique, based on a modified multi-electromagneticstirring continuous preparation (MSCP) process was developed for manufacturing near-net shapeAl-alloys components with high integrity. The modified MSCP process innovatively combines noncontactelectromagnetic stirring and an annular chamber with specially designed profiles to in situmake high quality semisolid slurry, and intensive forced shearing and self-wiping action can beachieved under high shear rate and high intensity of turbulence inside the annular chamber. ThreeAl-Si alloys with hypoeutectic, eutectic and hypereutectic compositions were tested in this study.The results indicate that, compared with those produced by conventional high-pressure diecasting(HPDC) process, rheo-diecasting samples based on the modified MSCP process have finer andmore uniform microstructure
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/24/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.141-143.185.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    Cavernous transformation of the portal vein secondary to tumor thrombosis of hepatocellular carcinoma: spiral CT visualization of the collateral vessels (2000)
    Springer
    Abdominal imaging 25 (2000), S. 385-393 
    Details
    ISSN: 1432-0509
    Keywords: Key words: Portal venous system—Cavernous transformation—Collateral circulation—Computed tomography, spiral.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Background: We investigated the constituting collateral vessels in cavernous transformation of the portal vein (CTPV) caused by tumor thrombosis of hepatocellular carcinoma (HCC) by using contrast-enhanced spiral computed tomographic (CT) examination. Methods: Fifty-four histopathologically proven HCC patients with tumor thrombosis-induced CTPV were retrospectively included and assigned to cirrhosis negative (n= 31) and positive (n= 23) groups. Another 15 cirrhotic patients with portal hypertension but no HCC and CTPV were used for comparison. Standardized dual-phase contrast-enhanced spiral CT was performed for all patients. CT appearances of the collateral vessels of CTPV were observed, and their visualization rates were analyzed. Results: Biliary (cystic and paracholedochal veins) and gastric (left and right gastric veins) branches of the portal vein were the most frequently visualized collateral vessels of CTPV. There was a marked difference in CT visualization rates for biliary branches between patients with and without CTPV (83–94% vs. 0). No difference existed in visualization rates for gastric branches across the three groups (77–87% for left gastric, 58–61% for right gastric vein). Conclusions: Biliary and gastric branches of the portal vein are the major collateral vessels of CTPV. The intergroup differences in CT visualization rates may provide clues to the roles that they might play in the hemodynamic adaptation process of CTPV.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/s002610000057
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  • 8
    Electronic Resource
    Electronic Resource
    Microstructure and Mechanical Properties of Rheo-Extruded AZ31 Mg Alloy (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 141-143 (July 2008), p. 713-718 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: A new rheo-extrusion technique has been developed to produce extruded profiles. TheAZ31 slurry is fabricated by a twin-screw mechanism, and has spheroidal solid particles with agrain size of about 50 to 80μm. The slurry was introduced into an extrusion container with an innerdiameter of 95mm, and then squeezed to a billet before extruding into a round bar with a diameterof 22mm using a 500kN extrusion machine. It is found that the new technique has a lowerdeformation resistance than that of the conventionally hot extrusion technique in the same extrusionvelocity. The microstructure and mechanical properties of the rheo-extruded bars were examined indetail. The results illustrated that grains of the bar were very fine with the average grain size about2.3μm，and the mechanical properties were improved substantially compared with those of thesame alloy produced by the conventional hot extrusion
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/24/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.141-143.713.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    Thixoforming and Industrial Application of the Semi-Solid Alloy Al-6Si-2Mg (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 116-117 (Oct. 2006), p. 72-75 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: An application of the semi-solid alloy Al-6Si-2Mg to produce automobile componentswas carried out for farther development of this new alloy. The experiments were done in aself-developed SSM trial line composed of semi-continuous caster combined with electromagneticstirring for feedstock billet production, 6-station induction reheating equipment for restoringthixotropy of SSM billet and modified die-casting unit for semi-solid thixoforming. The resultsshow that Al-6Si-2Mg alloy has such a suitable fraction solid and low temperature sensitivity offraction solid that the controllability of SSM process is increased greatly. The billets have uniformlyfine microstructure with a higher degree of sphericity and also retain good thixotropic properties.During thixoforming, the die is filled completely, the microstructure of components is dense, andthe primary phases are near spherical, and the mechanical property after heat treatment has goodperformance
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/22/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.116-117.72.pdf
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  • 10
    Electronic Resource
    Electronic Resource
    Semisolid Casting of Automotive Component: Water Pump Lid (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 116-117 (Oct. 2006), p. 88-91 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: Water pump lid is selected as the automotive component to be cast using semisolid castingtechnology. Semisolid feedstock of alloy A357 was produced by a vertical continuous DC castingwith electromagnetic stirring. Non-dendritic structure was obtained in the feedstock billets. A6-station induction heating system was developed for feedstock billet reheating. Multi-stage reheatingand well controlled reheating process resulted in a uniform temperature profile in the billet. Semisolidcasting was carried out in a conventional high pressure die casting machine. Die design and castingparameters were adjusted to be suitable for semisolid casting. Compared with the conventional liquidmelt casting, semisolid casting resulted in a much higher microstructural integrity with reducedshrinkage porosity
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/22/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.116-117.88.pdf
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