Structure transition

In low-cost permanent magnet synchronous motor (PMSM) drive systems, the rotor position is usually estimated based on the back-electromotive force. However, such estimation methods have the common drawback of having large errors in low-speed regions. In order to solve that drawback in the startup phase, the I-f startup method is studied as its compatibility with the FOC control structure. The purpose of such a method is to make the motor accelerate and overcome the low-speed threshold.

8p vialicene 02-07-2024 1 0   Download

The transition of patients between care contexts poses patient safety risks. Discharges to home from inpatient care can be associated with adverse patient outcomes. Quality in discharge processes is essential in ensuring safe transitions for patients.

10p vishanshan 27-06-2024 1 1   Download

In this work, the effect of annealing temperature and Cr3+ concentration on the structural and optical properties of the SnO2 host crystals has been investigated. The Cr-doped SnO2 samples were synthesized by a simple hydrolysis method, using SnCl4.5H2O as the host precursor and CrCl3.6H2O as the source of dopant.

9p viambani 18-06-2024 1 1   Download

This modeling is performed on an experimental data set of complexes, where the metal ions of these complexes include transition ion metals and lanthanide ion metals. We use these models to develop a series of new thiosemicarbazone and their complexes; simultaneously, the complexes are worked out the stability constants from the novel models.

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The paper results showed that the more than ten years mangrove community is a stable forest biome. Mangroves from 10 years old should be planned with different species to increase the diversity in species structure and enhance the ability to stabilize the community and withstand changes in coastal habitats.

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This article presents computational insights into the geometric and electronic structures of NbSi4 −/0 clusters using density functional theory and the CASSCF/CASPT2 method. The anionic and neutral ground states are identified as the 1A′ and 2A′ states, respectively, within a trigonal bipyramidal isomer where the Nb atom occupies the equatorial position. The adiabatic detachment energy for the transition from the anionic ground state 1A′ to the neutral ground state 2A′ is estimated to be 2.30 eV.

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Ebook "Transient changes in molecular geometries and how to model them: Simulating chemical reactions of metal complexes in solution to explore dynamics, solvation, coherence, and the link to experiment" focuses on the aspects of excess excitation energy dissipation via dynamic changes in molecular structure, vibrations and solvation.

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Ebook "Deformation and flow of polymeric materials" describes the properties of single polymer molecules and polymeric materials and the methods how to characterize them. Molar masses, molar mass distributions and branching structure are discussed in detail. These properties are decisive for a deeper understanding of structure/properties relationships of polymeric materials. This book therefore describes and discusses them in detail.

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Ebook "Highly luminescent lanthanide complexes with specific coordination structures" deals with strongly luminescent lanthanide complexes having novel coordination structures. Luminescent lanthanide complexes are promising candidates as active materials for EL devices, lasers, and bio-sensing applications. The organic ligands in lanthanide complexes control geometrical and vibrational frequency structures that are closely related to the luminescent properties.

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Ebook "Exotic properties of carbon nanomatter: Advances in physics and chemistry" reports the state-of-the-art advancements in modeling and characterization of fundamental and the recently designed carbon based nanocomposites (graphenes, fullerenes, polymers, crystals and allotropic forms). Written by leading experts in the field, the book explores the quantification, indexing, and interpretation of physical and chemical exotic properties related with space-time structure-evolution, phase transitions, chemical reactivity, and topology.

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Ebook "New synthetic routes to polyoxometalate containing ionic liquids: An investigation of their properties" carried out fundamental investigations into the development of polyoxometalate based ionic liquids (POM-ILs). The POM-ILs were obtained by charge balancing inorganic polyoxometalate (POM) anions with sterically demanding tetraalkylammonium or tetraalkylphosphonium cations.

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Ebook "Molecular electronic structures of transition metal complexes II" provide a fine endorsement of the way in which Carl’s contributions have influenced so many scientists and led them explore important new areas of transition metal chemistry, quantum theory, and spectroscopy.

247p coduathanh1122 27-03-2024 3 1   Download

Ebook "Molecular electronic structures of transition metal complexes I" presents critical reviews of the present position and future trends in modern chemical research concerned with chemical structure and bonding; electronic structures of oxo-metal ions; early days in kemisk laboratorium IV and later studies; transition metal corrole coordination chemistry;...

227p coduathanh1122 27-03-2024 3 1   Download

Ebook "Material designs and new physical properties in MX- and MMX-chain compounds" is the first book to comprehensively address the recent developments in both the experimental and theoretical aspects of quasi-one-dimensional halogen-bridged mono- (MX) and binuclear metal (MMX) chain complexes of Pt, Pd and Ni. These complexes have one-dimensional electronic structures, which cause the various physical properties as well as electronic structures.

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Ebook "Transition metal catalyzed carbonylation reactions: Carbonylative activation of C–X bonds" is a comprehensive monograph focusing on carbon monoxide usage. This book provides students and researchers in organic synthesis with a detailed discussion of carbonylation from the basics through to applications. The authors have structured the book around the types of reactions, based on the different nucleophiles involved.

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Ebook "Transition metal organometallic chemistry" serves as a concise guide to essential topics in Transition Metal Organometallic Chemistry for senior undergraduate and graduate students; it blends qualitative theoretical approach with experimental description of the facts.

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Ebook "Late transition metal-carboryne complexes: Synthesis, structure, bonding, and reaction with alkenes and alkynes" shows in this thesis that transition metals can mediate or catalyze the cycloaddition or coupling reactions of carboryne with alkynes or alkenes to afford benzocarboranes, alkenylcarboranes or dihydrobenzocarboranes. These results represent powerful strategies to assemble useful complex molecules from very simple precursors in a single operation. Carboranes have many applications in medicine.

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Ebook "d-d excitations in transition-metal oxides: A spin-polarized electron energy-loss spectroscopy (SPEELS) study" investigations of the electronic structures of the transition-metal oxides MnO, CoO, and NiO with spin-polarized electron energy-loss spectroscopy are presented and compared with other experimental and theoretical results. After a review of the present knowledge of the electronic structure of the monoxides, the spectroscopic method applied and its special advantages are described.

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Ebook "Ultraviolet and X-ray spectroscopy of the solar atmosphere" give us information about temperatures, densities, flow velocities, filling factors (indicating to what extent features are being spatially resolved), thermal structure, element abundances, ionization state of solar plasmas in the outer parts of the solar atmosphere: the chromosphere, the corona and the enigmatic transition region. They also allow insight into all phenomena in the solar atmosphere, e.g. flares, jets, and prominences.

390p duongthandue0501 28-02-2024 1 1   Download

Ebook "Gels: Structures, properties, and functions - Fundamentals and applications" provides readers with contents including: competitive hydrogen bonds and cononsolvency of poly(n-isopropylacrylamide)s in mixed solvents of water/methanol; rheological properties of solutions of a polyampholytic block copolymer; helix-coil transition and association behavior of water-soluble polypeptides having hydrophobic alkyl side chains;...

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