Energy density

Reference standards for bone mineral density (BMD) in children are not yet available in Vietnam. This study was conducted to quantify reference BMD values of children and adolescents in Ho Chi Minh City and to understand the associated factors.

9p vikoch 27-06-2024 1 1   Download

Ebook "An introduction to urban housing design: At home in the city" introduces the reader to the key aspects of housing design, and outlines the discussion about form and planning of urban housing. Using chapter summaries and with many illustrations, it presents contemporary concerns such as energy efficient design and high density development in a clear and accessible way.

335p giangdongdinh 28-05-2024 4 2   Download

Part 2 book "Automotive exhaust emissions and energy recovery" includes contents: Exhaust gas aftertreatment technologies and model based optimization, diesel particulate filter overview - material, geometry and application, turbocharging and exhaust energy recovery; small, high power density, directly injected, turbocharged engines; organic rankine cycles in automotive applications; automotive exhaust power and waste heat recovery technologies.

163p dianmotminh01 14-05-2024 1 0   Download

A thermochemical model was developed to calculate the H2 adsorption isotherm of the original Mg-MOF-74 framework, and its computationally designed isoreticular employing the adsorption energies and vibrational frequencies obtained from density functional theory calculations as input variables. The model reasonably replicates the experimental adsorption isotherm of the original framework at -196˚C within the pressure range up to 1 bar

13p dianmotminh02 03-05-2024 3 1   Download

The geometries and relative stabilities of 15 tautomeric forms and the corresponding isomers of the studied molecules have been identified and their relative stabilities are investigated. The potential energy profiles and intrinsic reaction coordinates (IRC) calculations along the proton transfer coordinates both in the ground and in the excited state are monitored as well. The impact of the donating (OMe) and withdrawing (NO2) groups on the single and double proton transfers are investigated both in the gas phase and solution.

9p dianmotminh02 03-05-2024 4 1   Download

This study focuses on examining the effect of the π bridge on the properties of the molecule. The structural parameters of the molecular geometry were optimized, the HOMO and LUMO energies were calculated and analyzed in detail. In addition, the absorption wavelength, excitation energy, vibration intensity and electron transfer were calculated through the time-dependent density functional theory (TD-DFT) method.

6p dianmotminh02 03-05-2024 4 2   Download

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.

8p dianmotminh02 03-05-2024 4 2   Download

Three chalcones with a 2,3-dihydrobenzofuran linkage were analyzed by applying the density functional theory (DFT) and B3LYP approach with the 6-311G(d,p) basis set in this report. Spectroscopic and theoretical analyses were used to examine the structures of these three chalcones. The chalcone molecules' HOMO-LUMO energy was determined. Chemical reactivity parameters and molecular electrostatic surface potential (MESP) plots were obtained to gain useful insight into the distribution of charge density.

11p dianmotminh02 03-05-2024 3 2   Download

Application of the OSTA (Osteoporosis Self-Assessment Tool for Asians) in assessing the risk of osteoporosis in postmenopausal women aged 45 years and older; Evaluation of the relationship between OSTA and bone mineral density measured by dual-energy X-ray absorptiometry (DEXA).

8p vioraclene 31-03-2024 4 2   Download

Accurately quantifying the risk of osteoporotic fracture is important for directing appropriate clinical interventions. While skeletal measures such as heel quantitative speed of sound (SOS) and dual-energy X-ray absorptiometry bone mineral density are able to predict the risk of osteoporotic fracture, the utility of such measurements is subject to the availability of equipment and human resources.

15p vibransone 28-03-2024 4 2   Download

Ebook "Chemical science of π-electron systems" presents the most advanced review available of all aspects of π-electron systems, including novel structures, new synthetic protocols, chemical and physical properties, spectroscopic and computational insights, molecular engineering, device properties and physiological properties. π-Electron systems are ubiquitous in nature. Plants convert light energy into chemical energy by photosynthetic processes, in which chlorophylls and other porphyrinoids play an important role.

765p tudohanhtau1006 29-03-2024 3 1   Download

This study aims to observe the value of the dual-energy computed tomography (DECT) technique in the assessment of primary lung cancer. Compare the difference in density of lung tumors on the true non-contrast (TNC) and virtual non-contrast (VNC) images.

7p virichard 28-03-2024 1 1   Download

Ebook "Reactions of solids with gases (Comprehensive chemical kinetics, Volume 21)" addresses collision energy transfer and the effects it has on gas phase reactions, particularly at low gas density. Such systems include combustion, industrial gas phase processes and atmospheric/environmental processes. The book also discusses The Master Equation to give a good overview of the mechanics underpinning unimolecular kinetics. This new volume will be of interest to researchers investigating gas phase processes which involve unimolecular reactions and the related intermolecular reactions.

253p coduathanh1122 27-03-2024 7 1   Download

This study aimed to address this knowledge gap by providing a comprehensive and detailed database of the characteristics and compositions of the most commonly encountered agricultural residues in Vietnam and Ireland. The research encompassed the analysis of various aspects, including physical characteristics such as moisture content, bulk density, calorific value, volatile matter, fixed-carbon content, and ash content.

6p vicwell 06-03-2024 6 3   Download

Ebook "Statistical complexity: Applications in electronic structure" is the first monograph of its kind covering the aspects of complexity measure in atoms and molecules. The understanding of electron density as the carrier of all the information of a multielectronic system is implicit in the theorems of density functional theory. Information theoretical based measures giving a quantitative understanding of statistical complexity of such systems is shaping up as a new area of research in chemical physics.

304p manmanthanhla0201 26-02-2024 6 2   Download

Ebook "Modeling marvels: Computational anticipation of novel molecules" is to survey a number of chemical compounds that some chemists, theoretical and experimental, find fascinating. Some of these compounds, like planar carbon species or oxirene, offer no obvious practical applications; nitrogen oligomers and polymers, in contrast, have been touted as possible high-energy-density materials. What unites this otherwise eclectic collection is that these substances are unknown and offer a challenge to theory and to synthesis.

287p manmanthanhla0201 27-02-2024 4 1   Download

Part 1 book "Engineering electromagnetics" includes content: Vector analysis, Coulomb’s law and electric field intensity; electric flux density, Gauss’s law, and divergence; energy and potential; conductors and dielectrics; capacitance; the steady magnetic field.

247p muasambanhan06 03-02-2024 3 2   Download

Part 1 book "Engineering electromagnetics" includes content: Vector analysis; Coulomb's law and electric field intensity; electric flux density, Gauss's law, and divergence; energy and potential; conductors, dielectrics, and capacitance; experimental mapping methods; Poisson's and Laplace's equations; the steady magnetic field; magnetic forces, materials, and inductance.

332p muasambanhan06 03-02-2024 2 1   Download

Ebook "Jacobi dynamics: A unified theory with applications to geophysics, celestial mechanics, astrophysics and cosmology" summarized as follows: the kinetic energy of oscillation of the interacting particles which explains the physical meaning and nature of the gravitation forces; separation of the shell’s rotation of a self-gravitating body with respect to the mass density; difference in angular velocities of the shell rotation;...

345p nhanphanguyet 28-01-2024 4 2   Download

This paper investigates the influence of energy density within the molten region on crack formation within the deposition layers of Inconel 625 nickel alloy formed using DLMD technology. Results show that lower energy densities lead to poor adhesion between the forming layers and the substrate material, thereby initiating cracks within the deposition layer.

6p vimarillynhewson 02-01-2024 5 3   Download