scholarly journals Energy levels of isoelectronic impurities by large scale LDA calculations

2003 ◽  
Vol 67 (3) ◽  
Author(s):  
Jingbo Li ◽  
Lin-Wang Wang
Keyword(s):  
Large Scale ◽  
Energy Levels ◽  
Isoelectronic Impurities

scholarly journals Large Scale Shell Model Calculations of the Negative-Parity States Structure in 24Mg Nucleus

2021 ◽  
Vol 66 (4) ◽  
pp. 293
Author(s):  
A.A. Al-Sammarraie ◽  
F.A. Ahmed ◽  
A.A. Okhunov
Keyword(s):  
Shell Model ◽  
Large Scale ◽  
Transition Probabilities ◽  
Transition Probability ◽  
Energy Levels ◽  
Form Factors ◽  
Model Space ◽  
Negative Parity ◽  
Matrix Elements ◽  
Model Calculations

The negative-parity states of 24Mg nucleus are investigated within the shell model. We are based on the calculations of energy levels, total squared form factors, and transition probability using the p-sd-pf (PSDPF) Hamiltonian in a large model space (0 + 1) hW. The comparison between the experimental and theoretical states showed a good agreement within a truncated model space. The PSDPF-based calculations successfully reproduced the data on the total squared form factors and transition probabilities of the negative-parity states in 24Mg nucleus. These quantities depend on the one-body density matrix elements that are obtained from the PSDPF Hamiltonian. The wave functions of radial one-particle matrix elements calculated with the harmonic-oscillator potential are suitable to predict experimental data by changing the center-of-mass corrections.

Control of Large-Scale Impacts by Designed Structural Damping

2005 ◽  
Author(s):  
Jan Wigaard ◽  
Christopher Hoen ◽  
Sverre Haver
Keyword(s):  
Impact Energy ◽  
Large Scale ◽  
Permanent Deformation ◽  
Energy Levels ◽  
Attractive Alternative ◽  
Safety Level ◽  
Shock Absorbers ◽  
Impact Forces ◽  
Multi Body ◽  
The Impact

Modification of deep-water floaters often involves module installation using a floating crane vessel. The impact forces caused by relative motions between the floating vessels represent a major challenge during set down on the floater deck due to the large inherent variability of these forces. Traditionally the difficulties in predicting impact forces during module installation have been overcome by the use of experienced based rules of thumb rather than accurate simulations and calculations. One has to some degree relied on the indeed present but un-quantifiable effect of human intelligence of the operation supervisor. Traditionally the impact forces are taken either by elastic deformation of the module itself and/or the installation guides or by permanent deformation of intermediate structural elements through e.g. plastic yielding of ductile metal members or crushing of wood members. Designing the module and the guides to be able to take the entire probable range of impact forces is difficult due to the inherent contradiction between wanted flexibility and required strength. The large uncertainties of the impact energy imply that it is difficult to design these intermediate elements to cover all possible impact energy levels. Furthermore, these elements cannot be applied in cases where repeated impacts may occur. An attractive alternative to the traditional solutions is application of industrial shock absorbers. The performance of these is predictable and they can be designed to cover the estimated range of impact energy. This paper will present a more precise and consistent design and analyses methodology that gives a more accurate measure on the reliability of the operation in accordance with code requirements. The paper will show application of industrial shock absorbers as an alternative to traditional solutions for impact handling during offshore module installation to floating vessels, illustrated with experience gained by the installation of two modules on the Visund Semi. Results from multi-body simulations and model tests comparing traditional methods with the proposed solution will be given. The significant benefits obtained with respect to increased operational performance, reduced acceleration loads on the installed equipment, the increased predictability of the operation, and the consistent safety level in accordance with code requirements, will be highlighted. The possibility to apply designed damping for other offshore applications like dropped object protection etc, is also discussed.

A dynamic model of nutrient pathways, growth, and body composition in fish

2007 ◽  
Vol 64 (12) ◽  
pp. 1669-1682 ◽  
Author(s):  
Nadav S Bar ◽  
Trygve Sigholt ◽  
Karl D Shearer ◽  
Åshild Krogdahl
Keyword(s):  
Body Composition ◽  
Amino Acid ◽  
Large Scale ◽  
Energy Levels ◽  
Predictive Ability ◽  
Amino Acid Profile ◽  
Tissue Growth ◽  
Whole Body ◽  
Nutrient Distribution ◽  
Feeding Experiments

The growth and body composition of an organism are dynamic and depend on available diet, as well as other environmental variables. A structured model is described predicting growth, body composition, and the first limiting amino acid for a variety of feeding regimes over a relatively long time scale. This model continuously provides, as a function of time, the flow of nutrients and metabolites through the principal metabolic pathways leading to tissue growth. Measurements of growth and whole body composition (including amino acid composition) from a large-scale experiment with Atlantic salmon (Salmo salar) have been employed to calibrate this model. Comparisons of simulations with the results of feeding experiments validate the predictive ability of the model. These types of simulations will be valuable in studying the quantitative relationships between intracellular energy levels and nutrient distribution in tissues. They will also provide data for balancing diet composition and amino acid profile in order to optimize growth with respect to factors such as body weight, body composition, and ambient temperature. As a result of its modularity, the model can be easily extended to include additional physiological and metabolic processes.

EXPRESS: High-Energy Ad Content: A Large-scale Investigation of TV Commercials

2021 ◽  
pp. 002224372110678
Author(s):  
Joonhyuk Yang ◽  
Yingkang Xie ◽  
Lakshman Krishnamurthi ◽  
Purushottam Papatla
Keyword(s):  
Energy Level ◽  
Large Scale ◽  
Energy Levels ◽  
Positive Association ◽  
High Energy ◽  
Data Set ◽  
Product Categories ◽  
Tv Commercials

A trend reported by both academics and practitioners is that advertising on TV has become increasingly energetic. This study investigates the association between the energy level in ad content and consumers’ tendency of ad-tuning. Using a data set of over 27,000 TV commercials delivered to U.S. homes during the period between 2015 and 2018, the authors first present a framework to algorithmically measure the energy level in ad content from the video of ads. This algorithm-based measure is then compared to human-perceived energy levels, which shows that the measure is related to the level of arousal stimulated by ad content. By relating the energy levels in ad content with the tendency of ad-tuning using two empirical procedures, the authors document the following. Overall, more energetic commercials are likely to be tuned in more or avoided less by viewers. The positive association between energy levels in ad content and ad-tuning is statistically significant after controlling for placement and other aspects of commercials. However, the association varies across product categories and program genres. The main implication of this study is that advertisers should pay attention to components of ad content other than loudness, which has been regulated by law.

Large-scale CIV3 calculations of fine-structure energy levels and radiative rates in Al-like copper

2009 ◽  
Vol 87 (8) ◽  
pp. 895-907 ◽  
Author(s):  
G. P. Gupta ◽  
A. Z. Msezane
Keyword(s):  
Fine Structure ◽  
Configuration Interaction ◽  
Large Scale ◽  
Radiative Decay ◽  
Energy Levels ◽  
Decay Rates ◽  
Experimental Results ◽  
Oscillator Strengths ◽  
Correct Identification ◽  
Excitation Energies

We have performed large-scale CIV3 calculations of excitation energies from the ground state for 97 fine-structure levels as well as of oscillator strengths and radiative decay rates for all electric-dipole-allowed and intercombination transitions among the fine-structure levels of the terms belonging to the (1s22s22p6)3s23p, 3s3p2, 3s23d, 3p3, 3s3p3d, 3p23d, 3s3d2, 3s24s, 3s24p, 3s24d, 3s24f, and 3s3p4s configurations of Cu XVII. These states are represented by very extensive configuration-interaction (CI) wave functions obtained with the CIV3 (Configuration-Interaction Version 3) computer code of Hibbert. The important relativistic effects in intermediate coupling are incorporated by means of the Breit–Pauli Hamiltonian, which consists of the nonrelativistic term plus the one-body mass correction, Darwin term, and spin–orbit, spin–other-orbit, and spin–spin operators. To keep our calculated energy splittings as close as possible to the experimental values (wherever available), we have made small adjustments to the diagonal elements of the Hamiltonian matrices. Our calculated excitation energies, including their ordering, are in excellent agreement with the available experimental results. From our radiative decay rates we have also calculated radiative lifetimes of some fine-structure levels. The mixing among several fine-structure levels is found to be so strong that the correct identification of these levels becomes very difficult. We believe that our extensive calculations will be useful to experimentalists in identifying the fine-structure levels in their future work. In this calculation we also predict new data for several fine-structure levels where no other theoretical and (or) experimental results are available.

scholarly journals Settlement scale analysis approach to reach nearly zero energy communities

2019 ◽  
Vol 111 ◽  
pp. 06026
Author(s):  
Ece Kalaycıoğlu ◽  
Ayşe Zerrin Yılmaz
Keyword(s):  
Large Scale ◽  
Energy Levels ◽  
Energy System ◽  
Energy Performance ◽  
High Energy ◽  
The European Union ◽  
Zero Energy ◽  
Building Stock ◽  
District Energy ◽  
Advantages And Disadvantages

Looking at the recent developments, the European Union (EU) aims to become a zero carbon community. For the building sector, Energy Performance of Buildings Directive (EPBD) was recast in 2010 introducing the definition of the nearly zero energy building (NZEB) levels to construct all new buildings at this level by the end of 2020. The last revision of the directive in 2018 also promotes the renovation of the building stock to the NZEB levels. In the paper, it was proposed to define the nearly zero energy levels for settlements. This way, it was aimed to discuss the advantages and disadvantages of reaching the nearly zero energy levels at larger scales than single buildings. Settlement level studies, including the district energy systems, intended to reveal the energy efficiency measures which lead to optimal cost levels for more than one building. Key parameters were examined for a new settlement design which may be beneficial for the large-scale renewable energy system implementation and district energy system (DES) usage with high energy performance buildings.

scholarly journals Classification of the 5p5nln'l' LSJ energy levels of Cs excited by 30 eV electrons

2015 ◽  
Vol 55 (2) ◽  
Author(s):  
Gintaras Kerevičius ◽  
Alicija Kupliauskienė
Keyword(s):  
Cross Sections ◽  
Electron Spectrum ◽  
Large Scale ◽  
Energy Levels ◽  
Coupling Scheme ◽  
Excitation Threshold ◽  
Angular Momenta ◽  
Excitation Cross Sections ◽  
Configuration Interaction Calculations

Theoretical investigation of the 5p5 nl(L1S1)n'l' LSJ autoionizing states of Cs was performed by using large scale configuration interaction calculations of energy levels, autoionization probabilities and excitation cross sections obtained in the Dirac–Fock–Slater approximation. Classification of calculated energy levels in the LSJ coupling scheme of angular momenta and simulation of the intensities of ejected Auger electron spectrum were performed. The classified energy levels in the region from the excitation threshold up to 17.365 eV and simulated intensity spectrum were used for identification of the experimental ejected-electron spectrum of Cs excited by 30 eV electrons.

scholarly journals Frequency-Energy Plots of Bistable Nonlinear Energy Sink

2021 ◽  
Author(s):  
Mohammed Ameen Al Shudeifat ◽  
Adnan Salem Saeed
Keyword(s):  
Large Scale ◽  
Initial Conditions ◽  
Energy Levels ◽  
Dynamical Behavior ◽  
Nonlinear Energy Sink ◽  
Low Energy ◽  
Unstable Equilibrium ◽  
Numerical Continuation ◽  
Energy Sink ◽  
Nonlinear Energy

Abstract The nonlinear energy sink (NES), which is proven to perform rapid and passive targeted energy transfer (TET), has been has been employed for vibration mitigation in many primary small- and large-scale structures. Recently, the feature of bistability, in which two nontrivial stable equilibria and one trivial unstable equilibrium exist, is utilized for passive TET in what is known as Bistable NES (BNES). The BNES generates a nonlinear force that incorporates negative linear and multiple positive or negative nonlinear stiffness components. In this paper, the BNES is coupled to a linear oscillator (LO) where the dynamic behavior of the resulting LO-BNES system is studied through frequency-energy plots (FEPs), which are generated by analytical approximation using the complexification-averaging method and by numerical continuation techniques. The effect of the length and stiffness of the transverse coupling springs is found to affect the stability and topology of the branches and indicates the importance of the exact physical realization of the system. The rich nonlinear dynamical behavior of the LO-BNES system is also highlighted through the appearance of multiple symmetrical and unsymmetrical in- and out of- phase backbone branches, especially at low energy levels. The wavelet transform is imposed into the FEP for variety of initial conditions and damping content and it is found that the FEP has backbone branches at low energy levels associated with the oscillation of the bistable attachments about one of its stable equilibrium positions where passage through the unstable equilibrium position does not occur.

scholarly journals Energy Levels, Lifetimes, and Transition Rates for P-like Ions from Cr x to Zn xvi from Large-scale Relativistic Multiconfiguration Calculations

2018 ◽  
Vol 235 (2) ◽  
pp. 27 ◽  
Author(s):  
K. Wang ◽  
P. Jönsson ◽  
G. Gaigalas ◽  
L. Radžiūtė ◽  
P. Rynkun ◽  
...  
Keyword(s):  
Large Scale ◽  
Energy Levels ◽  
Transition Rates

Energy levels of nitrogen isoelectronic impurities in AlxGa1−xAs

1976 ◽  
Vol 29 (3) ◽  
pp. 196-197 ◽  
Author(s):  
Shun‐ichi Gonda ◽  
Yunosuke Makita ◽  
Seiji Mukai ◽  
Toshio Tsurushima ◽  
Hisao Tanoue
Keyword(s):  
Energy Levels ◽  
Isoelectronic Impurities
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