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  • 1
    Keywords: Production of electric energy or ; Systems engineering ; Electronics ; Power Electronics, Electrical Machines and Networks ; Circuits and Systems ; Energy Systems ; Electronics and Microelectronics, Instrumentation ; Springer eBooks
    Description / Table of Contents: Introduction -- A General Control Strategy for DC-DC Series-Parallel Power Conversion Systems -- Mathematical Model of DC-DC ISOP System and Closed-Loop Parameters Design -- Wireless IVS Control Strategies for Input-Series-Connected Systems Based on Positive Output Voltage Gradient Method -- General Control Strategy for DC-AC Inverter Series-Parallel Combined System -- Compound Balanced Control Strategy for Input-Series-Output-Parallel DC-AC Inverter System -- Compound Balanced Control Strategy for Input-Series-Output-Series DC-AC Inverter System -- An Improved Average Current Control Strategy for Input-Parallel-Output-Parallel Inverter System -- Input Voltage Sharing Control Strategy for ISOP Systems under Extreme Load Conditions
    Abstract: Series-parallel conversion systems, in which multiple standardized converter modules are connected in series or parallel at the input and output sides, to meet the demands of various applications. This book focuses on the control strategies for the series-parallel conversion systems with DC-DC converters and DC-AC inverters as the basic modules, respectively, to achieve input voltage/current sharing and output voltage/current sharing among the constituent modules. The detailed theoretical analysis with design examples and experimental validations are presented. This book is essential and valuable reference for graduate students and academics majoring in power electronics and engineers engaged in developing DC-DC converters, DC-AC inverters and power electronics transformers
    Pages: XX, 213 p. 156 illus., 74 illus. in color. : online resource.
    ISBN: 9789811327605
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  • 2
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary Polyanhydrides from cycloaliphatic 1,4-Cyclohexanedicarboxylic acid (1,4-CHDA) were synthesized by melt polycondensation and characterized by WAXD, FTIR and DSC. The results show that these polymer displayed strong crystallinity with highly melting point and can't be dissolved in common solvents. The polymers, which come from different original isomer conformation CHDA, show different melting point and DSC curve. The isomerization happened during the polymerization and reached an equilibrium point at last. By melt polycondensation, the high cis-isomer content polyanhydride is difficult to obtained.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1432-1246
    Keywords: Biological monitoring ; Methylhippuric acids ; Toluene ; Xylene ; Urinalysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The correlation between exposure to three xylene isomers and resulting urinary excretion of corresponding methylhippuric acid (MHA) isomers was studied among 175 Chinese workers of both sexes who had been predominantly exposed to xylenes (exposure to xylenes accounting for 70% or more of the total exposure on a ppm basis). Nonexposed controls (281 men and women) were also studied to define the background level of MHAs in urine. The solvent exposure of xylene-exposed workers during their workshift was monitored by diffusive sampling of breathing zone air, and MHAs in shift-end urine were determined by high-performance liquid chromatography. Regression analysis showed that the concentration of each MHA isomer correlated significantly with the time-weighted average intensity of exposure to the corresponding xylene isomer, and therefore the correlation between the sum of three xylene isomers in air and that of three MHA isomers in urine was also significant; the slope of the regression line was essentially the same among the three isomers. The calculated regression line suggested that the urinary MHA level after hypothetical exposure to xylenes at 100 ppm will be somewhat less than the proposed biological exposure index and biological tolerance value. Two social habits of smoking and drinking in combination suppressed the conversion of xylenes to MHAs in male workers.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have found that an amorphous phase with a wide supercooled liquid region reaching 85 K before crystallization is formed in Fe–(Co, Ni)–(Zr, Nb, Ta)–B, Fe–Co–(Zr, Nb)–(Mo, W)–B and Co–Fe–Zr–B systems. The high stability of the supercooled liquid enabled the production of bulk amorphous alloys with diameters up to 5 mm by copper mold casting. These amorphous Fe–(Co, Ni)–M–B alloys exhibit good soft magnetic properties, i.e., saturation magnetization of 0.95 to 1.1 T, low coercivity of 1 to 8 A/m, Curie temperature of 560 to 590 K and low magnetostriction of 8–14×10−6. The effective permeability of the Co–based alloys exceeds 25 000 at 1 kHz and keeps high values above 5000 at the high frequency of 1 MHz. The permeability at 1 MHz is much higher than those for any kinds of soft magnetic materials. The frequency at which the imaginary part of permeability shows a maximum is also about 1 MHz. The success of synthesis of new Fe- and Co-based amorphous alloys with good soft magnetic properties and high glass-forming ability is promising for future development of a new type of soft magnetic material. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Biochemistry 32 (1993), S. 12311-12318 
    ISSN: 1520-4995
    Source: ACS Legacy Archives
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1572-879X
    Keywords: methane aromatization ; bench scale test ; steam treatment ; activation procedure ; Mo2C
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A bench scale reaction test for methane aromatization in the absence of an added oxidant was performed and its reaction result evaluated based on the carbon balance of the system. The result was compared with those obtained from the micro‐reaction test to ensure the accuracy of the internal standard analyzing method employed in this paper. The catalytic performances of modified Mo/HZSM‐5 catalysts were examined. It was found that pre‐treatment by steam on HZSM‐5 weakened the serious deposition of coke, and pre‐impregnation of n-ethyl silicate on HZSM‐5 could improve the conversion of CH4, but had little effect on coke formation. A low temperature activation procedure including pre‐reduction of the catalyst with methane prevents the zeolite lattice from being seriously destroyed by high valence state Mo species when the Mo loading is high. It was suggested that Mo2C species detected by XRD spectra was the active phase for CH4 aromatization.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1572-879X
    Keywords: methane ; adsorption ; hydroxyl groups ; H-D exchange reaction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Infrared investigations on the interaction of methane with silica, aluminas (η,γ and α) and HZSM-5 zeolite have been carried out. At low temperature (173 K), methane adsorption was observed over these oxides and HZSM-5 zeolite. Our findings featured that the infrared inactiveΝ 1 band (2917 cm−1) of a gaseous methane molecule became active and shifted to lower frequencies (2900 and 2890 cm−1) when it adsorbed on the surfaces of these adsorbents. Our results also demonstrate that hydroxyl groups played a very important role in methane adsorption over the acidic oxides and the HZSM-5 zeolite. When interaction between the hydroxyl groups and methane took place, the band shift of the hydroxyl groups varied with different oxides. The strength of the interaction decreased according to the following sequence, Si-OH-Al>Al-OH>Si-OH, which is in accordance with the order of their acidities. At higher temperatures, methane interacted quite differently with various oxides and HZSM-5 zeolite. It has been observed that the hydroxyl groups of silica, γ-alumina and HZSM-5 zeolite could exchange with CD4 at temperatures higher than 773K, while those on η-alumina could exchange at a temperature as low as 573 K. Another interesting observation was the formation of formate species over Al2O3 (both η and γ) at temperatures higher than 473 K. The formate species would decompose to CO2, or produce carbonate at much higher temperatures. Formation of formate species was not observed over silica and HZSM-5 under similar conditions, α-Al2O3 did not adsorb or react with methane in any case.
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Titania-supported platinum-tin hydrocarbon dehydrogenation catalysts formed by initial treatment in air contain Sn4+ which is reduced by low temperature treatment in hydrogen to Sn2+. Subsequent exposure to the reducing atmosphere at moderate temperatures results in the reoxidation of some of the Sn2+ species. Continued treatment at elevated temperatures gives rise to the formation of a platinum-tin alloy. The unusual behaviour of titania-supported platinum-tin described in this work resembles results previously recorded from other titania-supported bimetallic catalysts containing iron and Group VIII precious metals.
    Type of Medium: Electronic Resource
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  • 9
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: New bulk amorphous alloys exhibiting a wide supercooled liquid region before crystallization were found in Fe–(Co,Ni)–(Zr,Nb,Ta)–(Mo,W)–B systems. The Tg is as high as about 870 K and the supercooled liquid region reaches 88 K. The high thermal stability of the supercooled liquid enabled the production of bulk amorphous alloys with diameters up to 6 mm. These bulk amorphous alloys exhibit a high compressive strength of 3800 MPa, high Vickers hardness of 1360, and high corrosion resistance. Besides, the amorphous alloys exhibit a high magnetic-flux density of 0.74–0.96 T, low coercivity of 1.1–3.2 A/m, high permeability exceeding 1.2×104 at 1 kHz, and low magnetostriction of about 12×10−6. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 10
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Adsorptive stripping voltammetry of testosterone propionate was investigated and a procedure worked out for its trace measurement. The method is based on the adsorptive accumulation of testosterone propionate at the hanging mercury drop electrode. The reduction peak was observed by scanning the potential in a negative direction. Optimal conditions were a Britton Robinson buffer solution (pH 6.5) and an adsorption accumulation potential of — 1.0 V. A low detection limit of 5×10−9 mol/l was obtained. The method was applied to the determination of testosterone propionate in pharmaceutical preparations.
    Type of Medium: Electronic Resource
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