The dielectric function Formula: see text of monolayer molybdenum diselenide (MoSe
) is obtained and analyzed at temperatures from 31 to 300 K and at energies from 0.74 to 6.42 eV. The sample is a ...large-area, partially discontinuous monolayer (submonolayer) film of MoSe
grown on a sapphire substrate by selenization of pulsed laser deposited MoO
film. Morphological and optical characterizations verified the excellent quality of the film. The MoSe
data were analyzed using the effective medium approximation, which treats the film and bare substrate regions as a single layer. Second derivatives of ε with respect to energy were numerically calculated and analyzed with standard lineshapes to extract accurate critical-point (CP) energies. We find only 6 CPs for monolayer MoSe
at room temperature. At cryogenic temperatures 6 additional structures are resolved. The separations in the B- and C-excitonic peaks are also observed. All structures blue-shift and sharpen with decreasing temperature as a result of the reducing lattice constant and electron-phonon interactions. The temperature dependences of the CP energies were determined by fitting the data to the phenomenological expression that contains the Bose-Einstein statistical factor and the temperature coefficient.
A novel pUC19-based gene replacement vector has been developed. This vector incorporates (
i) the counterselectable
sacB marker, (
ii) a
lacZα allele for blue-white screening, (
iii) an
oriT for ...conjugation-mediated plasmid transfer and (
iv) unique cloning sites for
SmaI and the rare-cutting meganuclease
I-SceI. These rare restriction sites are also present on the helper plasmid pUC19Sce. The replacement vector is engineered to contain few restriction sites to gain greater access to restriction sites within cloned DNA fragments, thus facilitating their genetic manipulation. The usefulness of the system was demonstrated by chromosomal integration of a newly constructed
xylE::Gm
R fusion cassette into the
glpD gene of
Pseudomonas aeruginosa.
When performing narrow-width computations, power gating of unused arithmetic circuit portions can significantly reduce leakage power. We deploy coarse-grain power gating in 32-bit integer arithmetic ...circuits that frequently will operate on narrow-width data. Our contributions include a design framework that automatically implements coarse-grain power-gated arithmetic circuits considering a narrow-width input data mode, and an analysis of the impact of circuit architecture on the efficiency of this data-width-driven power gating scheme. As an example, with a performance penalty of 6.7%, coarse-grain power gating of a 45-nm 32-bit multiplier is demonstrated to yield an 11.6× static leakage energy reduction per 8×8-bit operation.
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•Fast, facile, environmentally friendly method is proposed for preparing nanofluid.•Low cost, good stability, high thermal conductivity graphene oxide (GO) nanofluids was ...prepared.•Maximum enhancement in thermal conductivity of GO nanofluid reached up to 31%.•Interface layer thermal conductivity between GO and distilled water base was found.
A simple, low-cost, and environmentally friendly approach was proposed for preparing high thermal conductivity nanofluids containing graphene oxide (GO) by using the solution plasma exfoliation (SPE) technique from graphite electrode of recycled battery core. The average length and thickness of GO were determined to be and 1.5 μm and 3.3 nm corresponding to 8–10 layers, respectively. The nanofluids containing 1 vol% GO exhibited a good stability and highest thermal conductivity of 0.786 W.m−1.K−1 which is about 31% enhancement in the thermal conductivity compared to the water-based fluid. The interfacial thermal resistance (RK) and the thermal conductivity interfacial layer (ki) between GO and base fluid were found to be 56 × 10−8 m2 K W−1 and 8.5 W m−1 K−1, respectively.
This paper proposes a swash plate disturbance application device for human standing stability evaluation. It is known that when a mechanical disturbance is applied to the lower body, the COP (center ...of pressure) trajectory of the human is closely related to the standing stability of the human. Based on this fact, the paper first proposes a swash plate disturbance application device to measure the COP trajectory when the mechanical disturbance is applied. A linear identification method, where the input is the disturbance and the output is COP trajectory, is used to get a human standing stability system model. The model is expressed by a transfer function which includes the parameters of poles and zeros. Using the identified parameters, a human standing stability index is proposed. By some swash plate disturbance experiments for human standing and system identification experiments under several experimental conditions based on the proposed method, parameters of stability system dynamical model are obtained. The proposed index is calculated using the parameters. Then, it is found that the stability index values according to the experimental conditions such as normal standing and tandem standing, which is known more unstable one and less stable one, are properly obtained.
Background: Ginsenoside Rg3 is a promising anticancer agent. It is usually produced by heat treatment of ginseng, in which ginsenoside Rb1 is the major ginsenoside. A kinetic study was conducted to ...optimize ginsenoside Rg3 production by the heat treatment of ginsenoside Rb1. Methods: Ginsenoside Rb1 was heated using an isothermal machine at $80^{\circ}C$ and $100^{\circ}C$ and analyzed using HPLC. The kinetic parameters were calculated from the experimental results. The activation energy was estimated and used to simulate the process. The optimized parameters of ginsenoside Rg3 production are suggested based on the simulation. Results: The rate constants were $0.013h^{-1}$ and $0.073h^{-1}$ for the degradation of ginsenosides Rb1 and Rg3 at $80^{\circ}C$, respectively. The corresponding rate constants at $100^{\circ}C$ were $0.045h^{-1}$ and $0.155h^{-1}$. The estimated activation energies of degradation of ginsenosides Rb1 and Rg3 were 69.2 kJ/mol and 40.9 kJ/mol, respectively. The rate constants at different temperatures were evaluated using the estimated activation energies, and the kinetic profiles of ginsenosides Rb1 and Rg3 at each temperature were simulated based on the proposed kinetic model of consecutive reaction. The optimum strategies for producing ginsenoside Rg3 from ginsenoside Rb1 are suggested based on the simulation. With increased temperature, a high concentration of ginsenoside Rg3 is formed rapidly. However, the concentration decreases quickly after the reaching the maximal concentration value. Conclusion: The optimum temperature for producing ginsenoside Rg3 should be the highest temperature technically feasible below $180^{\circ}C$, in consideration of the cooling time. The optimum reaction time for heat treatment is 30 min.
The research on magnetic resonances in typical meta-atoms has led to the discovery of electromagnetic metamaterials (MMs). These new materials played a crucial role in achieving extraordinary ...phenomena as well as promised potential applications. In this paper, we numerically and experimentally investigated two different MM effects: the absorption and the negative refraction, which induced by magnetic resonances in a symmetric structure. The meta-atom sandwich model that includes two parallel flat rings separated by an insulating slab was designed. Firstly, three resonances in sub-wavelength range were demonstrated, revealing the negative permittivity and permeability effects. Notably, negative refractive index (NRI) was gained at the third-gap resonance, resulting from superposition of the rest of the electric resonance and the magnetic one accompanied by multi-plasmon. Moreover, the manipulation of the structural parameters could control the NRI behavior and, interestingly, a nearly perfect absorption peak arises in shallow sub-wavelength regime.
Cam Ha, Hoi An considered the “capital” of kumquats in the Central region with unique artistic shapes of kumquat trees by leading artisans of Cam Ha ornamental kumquats. Cam Ha kumquat trees have ...brought a significant source of income to local people and contributed to making the scent of Vietnamese spring days even more brilliant. The article examines the potential for developing individual startup business models on the basis of some typical examples of implementing the Kumquat startup model in Cam Ha - Hoi An. Besides, the article also mentions the difficulties for the startup model of trading products from Cam Ha Kumquat and proposes solutions to develop the startup business model from Kumquat in Cam Ha - Hoi An.
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