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The structure of atoms

Xem 1-20 trên 191 kết quả The structure of atoms
  • This paper studies the structure of the Mullite system (3Al2O3.2SiO2) by Molecular Dynamics simulation (MDs) using the Born–Mayer–Huggins pair interaction and periodic boundary conditions. The simulation was performed with model of 5250 atoms at different pressure and at 3500 K temperature.

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  • The VATLY radio telescope has been used to draw the map of atomic hydrogen gas in the disk of the Milky Way. Effects resulting from its differential rotation, its cloud and arm structure and the presence of a dark matter halo have been observed.

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  • The first two chapters of the text cover a variety of topics that you need to get started with your study of organic chemistry. Chapter 1 reviews the topics from general chemistry that will be important to your study of organic chemistry. The chapter starts with a description of the structure of atoms and then proceeds to a description of the structure of molecules. Molecular orbital theory is introduced. Acid–base chemistry, which is central to understanding many organic reactions, is reviewed.

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  • The heroine of this book is nature’s simplest atom, the hydrogen atom. With one exception—the helium atom—hydrogen is the mother of all atoms and molecules. The hydrogen atom consists of a single electron and a single proton; the proton is the nucleus of the hydrogen atom and serves as the electron’s anchor. The universe is teeming with hydrogen: every cubic centimeter of dark interstellar space, essentially void of any other known matter,1 contains a few atoms of hydrogen

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  • Tài liệu Physical science: Structure of Matter presents about what are the two regions of an atom from the electron cloud model? What do helium, neon, and argon have in common? How do you separate sugar from a sugar-sand mixture? All matter found in nature can be classifi ed as elements, compounds, or mixtures.

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  • (bq) part 1 book "materials science and engineering - an introduction" has contents: atomic structure and interatomic bonding, the structure of crystalline solids, imperfections in solids, diffusion, mechanical properties of metals, dislocations and strengthening mechanisms,...and other contents.

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  • The structure of the reduced form of cytochromec6 from the mesophilic cyanobacteriumSynechococcussp. PCC 7002 has been determined at 1.2 A ˚ and refined to an R-factor of 0.107. This protein is unique among all known cytochromesc6, owing to the presence of an unusual seven-residue insertion, KDGSKSL(44–50), which differs from the insertion found in the recently discovered plant cytochromesc6A .

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  • (bq) part 1 book "materials science and engineering - an introduction" has contents: introduction, atomic structure and interatomic bonding, the structure of crystalline solids, imperfections in solids, diffusion, mechanical properties of metals, dislocations and strengthening mechanisms,... and other contents.

    pdf482p bautroibinhyen19 02-03-2017 58 1   Download

  • The N,O-bidentate ligand 2-((methylimino)methyl)pyren-1-ol (1) gives with nickel acetate in a mixed solvent of toluene and ethanol in the presence of NaOAc the nickel(II) complex 1(Ni). It was characterized by elemental analysis, IR, NMR, MS spectroscopy and single crystal Xray diffraction. With respect to the nickel atom the complex 1(Ni) adopts a distorted square planar trans-coordination geometry.

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  • This work reports the melting of boride precipitates along the grain boundary of a supposedly solid state welding of a polycrystalline superalloy, and discusses its attendant effect on the hot ductility behaviour of the alloy. Nickel-based superalloy used for this study was previously processed by hot extrusion of argon atomized powered followed by forging. The alloy was solution heat treated at 1120°C, aged at 760°C and subsequently air cooled to room temperature.

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  • The reliability of Quantitative Structure – Activity or Property Relationships for prediction of physico-chemical properties and anticancer activity of flavone and isoflavone derivatives was improved by using the quantitative relationships between structurally similar flavone and isoflavone structures (QSSRs). The targeted-compound method was developed by a training set, which contains only similar compounds structurally to target compound.

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  • he resulting structures were subsequently optimized, tested for stability, and compared with the proposed experimental fibril models, using molecular dynamics simulations in two popular all-atom force fields. Our results show that the Aβ42 tetramer can form polymorphic stable structures, which may explain different pathways of Aβ aggregation. The models obtained comprise the outer and core chains and, therefore, are significantly different from the structure of mature fibrils.

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  • This is the first book to cover the history, structure, and application of atomic force microscopy in cell biology. Presented in the clear, well-illustrated style of the Methods in Cell Biology series, it introduces the atomic force microscope (AFM) to its readers and enables them to tap the power and scope of this technology to further their own research. A practical laboratory guide for use of the atomic force and photonic force microscopes, it provides updated technology and methods in force spectroscopy.

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  • (bq) part 2 book "general chemistry - the essential concepts" has contents: energy relationships in chemical reactions; the electronic structure of atoms; the periodic table; introduction to organic chemistry; intermolecular forces and liquids and solids; intermolecular forces and liquids and solids; chemical kinetics; chemical kinetics,... and other contents.

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  • (bq) part 1 book "chemistry" has contents: chemistry - the study of change; atoms, molecules, and ions; mass relationships in chemical reactions; reactions in aqueous solutions; gases; thermochemistry; quantum theory and the electronic structure of atoms; periodic relationships among the elements, chemical bonding i - basic concepts, chemical bonding ii - molecular geometry and hybridization of atomic orbitals.

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  • the second edition of atoms, radiation, and radiation protection has several important new features. si units are employed throughout, the older units being de-fined but used sparingly. there are two new chapters. one is on statistics for health physics. it starts with the description of radioactive decay as a bernoulli process and treats sample counting, propagation of error, limits of detection, type-i and type-ii errors, instrument response, and monte carlo radiation-transport computations.

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  • (bq) part 1 book "general chemistry - the essential concepts" has contents: introduction; atoms, molecules, and ions; reactions in aqueous solutions; stoichiometry; gases; energy relationships in chemical reactions; the electronic structure of atoms; the periodic table,...and other contents.

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  • Onconase (ONC) is an amphibian member of the pancreatic ribonuclease superfamily that is selectively toxic to tumor cells. It is a much less efficient enzyme than the archetypal ribonuclease A and, in an attempt to gain fur-ther insight, we report the first atomic resolution crystal structure of ONC, determined in complex with sulfate ions at 100 K.

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  • In the first half of the talk, the current state of our ongoing structure-function analysis of the mRNA transcription cycle will be dis-cussed. The crystallographic structures of the complete 12-subunit RNA polymerase II in free form and with bound DNA and RNA have been determined as atomic models. The structure of the complete Pol II elongation complex bound by the transcript cleavage factor TFIIS explained how Pol II uses a single tunable active site for both RNA synthesis and RNA cleavage.

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  • The interaction of multiple HIV-1 regulator of virion (Rev) proteins with the viral RNA target, the Rev response element (RRE), is critical for nuclear export of incompletely spliced and unspliced viral RNA, and for the onset of the late phase in the viral replication cycle. The heterogeneity of the Rev–RRE complex has made it difficult to study using conventional structural methods.

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