The Experts below are selected from a list of 13399731 Experts worldwide ranked by ideXlab platform
Peter J. Mohr - One of the best experts on this subject based on the ideXlab platform.
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Perturbation approach to the Self-Energy of non- S hydrogenic states
Physical Review A, 2003Co-Authors: Eric-olivier Le Bigot, Paul Indelicato, Peter J. Mohr, Ulrich D. Jentschura, Gerhard SoffAbstract:We present results on the Self-Energy correction to the energy levels of hydrogen and hydrogenlike ions. The Self-Energy represents the largest QED correction to the relativistic (Dirac-Coulomb) energy of a bound electron. We focus on the perturbation expansion of the Self-Energy of non-S states, and provide estimates of the so-called ${A}_{60}$ perturbation coefficient, which can be viewed as a relativistic Bethe logarithm. Precise values of ${A}_{60}$ are given for many P, D, F, and G states, while estimates are given for other states. These results can be used in high-precision spectroscopy experiments in hydrogen and hydrogenlike ions. They yield the best available estimate of the Self-Energy correction of many atomic states.
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Coordinate-space approach to the bound-electron Self-Energy: Self-Energy screening calculation
Physical Review A, 2001Co-Authors: Paul Indelicato, Peter J. MohrAbstract:The Self-Energy screening correction is evaluated in a model in which the effect of the screening electron is represented as a first-order perturbation of the self energy by an effective potential. The effective potential is the Coulomb potential of the spherically averaged charge density of the screening electron. We evaluate the energy shift due to a $1s_{1/2}$, $2s_{1/2}$, $2p_{1/2}$, or $2p_{3/2}$ electron screening a $1s_{1/2}$, $2s_{1/2}$, $2p_{1/2}$, or $2p_{3/2}$ electron, for nuclear charge Z in the range $5 \le Z\le 92$. A detailed comparison with other calculations is made.
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6s and 8d state self energy for hydrogen like ions and new results on the self energy screening
Hyperfine Interactions, 1998Co-Authors: P Indelicato, Peter J. MohrAbstract:We use a recently published method for the renormalization of the Self-Energy to calculate the Self-Energy of 6s and 8d levels to all orders in Zα. We demonstrate the accuracy of the method and its potential for high-n, low-Z applications. We also show that this method is perfectly suited for the evaluation of the two-electron Self-Energy (Self-Energy screening). For the first time, evaluation of the screening of the 1s electron by a second one in either the 1s,2s, 2p1/2 or 2p3/2 shells has been performed, for 30 ⩽ Z ⩽92.
Zhong Lin Wang - One of the best experts on this subject based on the ideXlab platform.
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all in one shape adaptive self charging power package for wearable electronics
ACS Nano, 2016Co-Authors: Hengyu Guo, Minhsin Yeh, Yingchih Lai, Yunlong Zi, Changsheng Wu, Zhen Wen, Chenguo Hu, Zhong Lin WangAbstract:Recently, a self-charging power unit consisting of an energy harvesting device and an energy storage device set the foundation for building a self-powered wearable system. However, the flexibility of the power unit working under extremely complex deformations (e.g., stretching, twisting, and bending) becomes a key issue. Here, we present a prototype of an all-in-one shape-adaptive self-charging power unit that can be used for scavenging random body motion energy under complex mechanical deformations and then directly storing it in a supercapacitor unit to build up a self-powered system for wearable electronics. A kirigami paper based supercapacitor (KP-SC) was designed to work as the flexible energy storage device (stretchability up to 215%). An ultrastretchable and shape-adaptive silicone rubber triboelectric nanogenerator (SR-TENG) was utilized as the flexible energy harvesting device. By combining them with a rectifier, a stretchable, twistable, and bendable, self-charging power package was achieved fo...
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Energy harvesting for self-powered nanosystems
Nano Research, 2008Co-Authors: Zhong Lin WangAbstract:In this article, an introduction is presented about the energy harvesting technologies that have potential for powering nanosystems. Our discussion mainly focuses on the approaches other than the well-known solar cell and thermoelectrics. We mainly introduce the piezoelectric nanogenerators developed using aligned ZnO nanowire arrays. This is a potential technology for converting mechanical movement energy (such as body movement, muscle stretching, blood pressure), vibration energy (such as acoustic/ultrasonic wave), and hydraulic energy (such as fl ow of body fl uid, blood fl ow, contraction of blood vessel, dynamic fl uid in nature) into electric energy for self-powered nanosystems.
Xin Wang - One of the best experts on this subject based on the ideXlab platform.
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energy self sufficient wastewater treatment plants feasibilities and challenges
Energy Procedia, 2017Co-Authors: Pengzhou Luo, Hongtao Wang, Xin WangAbstract:Abstract Optimization of energy efficiency is important for wastewater treatment plants (WWTPs). Increasing energy costs and concerns about global climate change highlight the need to realize energy self-sufficiency in WWTPs. Energy self-sufficient WWTPs have been studied to reduce operation costs, energy consumption and achieve carbon neutrality. In this paper, we analyzed the energy consumption and recovery in WWTPs. We characterized the comprehensive influence factors of energy use in WWTPs including treatment techniques, treatment capacity and different regions. It is feasible to establish energy self-sufficient WWTPs, although there are still challenges for the implementation of energy self-sufficient WWTPs, such as technology barriers and higher investments, particularly in developing countries.
Barry W. Ninham - One of the best experts on this subject based on the ideXlab platform.
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Dispersion Self-Free Energies and Interaction Free Energies of Finite-Sized Ions in Salt Solutions
Langmuir, 2004Co-Authors: Mathias Boström, Barry W. NinhamAbstract:The role for many-body dipolar (dispersion) potentials in ion−solvent and ion−solvent−interface interactions is explored. Such many-body potentials, accessible in principle from measured dielectric data, are necessary in accounting for Hofmeister specific ion effects. Dispersion Self-Energy is the quantum electrodynamic analogue of the Born electrostatic Self-Energy of an ion. We here describe calculations of dispersion self-free energies of four different anions (OH-, Cl-, Br-, and I-) that take finite ion size into account. Three different examples of self-free energy calculations are presented. These are the self-free energy of transfer of an ion to bulk solution, which influences solubility; the dispersion potential acting between one ion and an air−water interface (important for surface tension calculations); and the dispersion potential acting between two ions (relevant to activity coefficient calculations). To illustrate the importance of dispersion self-free energies, we compare the Born and dispe...
Pengzhou Luo - One of the best experts on this subject based on the ideXlab platform.
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energy self sufficient wastewater treatment plants feasibilities and challenges
Energy Procedia, 2017Co-Authors: Pengzhou Luo, Hongtao Wang, Xin WangAbstract:Abstract Optimization of energy efficiency is important for wastewater treatment plants (WWTPs). Increasing energy costs and concerns about global climate change highlight the need to realize energy self-sufficiency in WWTPs. Energy self-sufficient WWTPs have been studied to reduce operation costs, energy consumption and achieve carbon neutrality. In this paper, we analyzed the energy consumption and recovery in WWTPs. We characterized the comprehensive influence factors of energy use in WWTPs including treatment techniques, treatment capacity and different regions. It is feasible to establish energy self-sufficient WWTPs, although there are still challenges for the implementation of energy self-sufficient WWTPs, such as technology barriers and higher investments, particularly in developing countries.
