Results 1 - 10 of 11
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[en] To develop a method of analyzing apoptosis using multi-parameter flow cytometry, HL60 cell line was incubated with Annexin V-FITC/PI after exposure to etoposide, and the apoptosis of HL60 cell was monitored by flow cytometry. The result showed that the percentage of apoptosis cell increases with the time of exposure to etoposide. In conclusion, Annexin V FITC/PI method can not only detect special proteins, but also monitor the integrity of cell membrane. Multi-parameter flow cytometry is a rapid, easy and accurate method for the detection of apoptosis
[en] We propose a method to generate quadrature-squeezed states of a moving mirror in a Fabry-Perot cavity. This is achieved by exploiting the fact that when the cavity is driven by an external field with a large detuning, the moving mirror behaves as a parametric oscillator. We show that parametric resonance can be reached approximately by modulating the driving field amplitude at a frequency matching the frequency shift of the mirror. The parametric resonance leads to an efficient generation of squeezing, which is limited by the thermal noise of the environment.
[en] We investigate the response of a harmonically confined mirror to an optical pulse in cavity optomechanics. We show that when the pulsed coupling strength takes the form of a chirped pulse, thermal fluctuations of the mirror can be significantly transferred to the cavity field. In addition, the frequency modulation of the pulse could enable a better cooling performance by suppressing the sensitivity of the dependence of detuning and pulse areas. Using numerical investigations, we find that the pulsed cooling is mainly limited by the cavity-field decay rate.
[en] Highlights: • A novel biomass-derived nitrogen and oxygen co-doped hierarchical porous carbon was designed. • The nitrogen and oxygen co-doped PNPC possesses high contents of N (0.99 at%) and O (8.99 at%). • The as-fabricated PNPC-x exhibits excellent electrochemical performance. - Abstract: Carbon-based supercapacitor is one of the most promising energy conversion devices due to its ultrahigh power density and superior cycling durability, but most of carbon materials for high performance supercapacitor may involve high cost, sophisticated chemical procedures or tedious fabrication processes. Herein, a reproducible biomass-derived porous carbon with efficient ion-accessible surface and high content of heteroatoms has been successfully prepared by a simple high-temperature pyrolysis process. The facile chemical activation enables the as-synthesized materials own a hierarchical porous structure with an ideal pore size distribution and high contents of nitrogen (0.99 at%) and oxygen (8.99 at%), which is conducive to the high-efficiency transfer of electrolyte ions and enhancement in electrical conductivity of the materials. The as-fabricated hierarchical porous carbon materials deliver excellent specific capacitance of 287.1 F g−1 at 1 A g−1 and admirable cycling durability of 99.0% at current density of 1 A g−1 after 10,000 cycles in 6.0 M KOH electrolyte. Remarkably, the assembled symmetric supercapacitor exhibits an excellent energy density of 43.0 Wh kg−1 at power density of 875.0 W kg−1 in ionic liquid electrolyte. This study shows that low cost porous carbon materials derived from biomass source by a facile pyrolysis might be a great option to fabricate high performance energy conversion device.
[en] We study analytically the dynamic behaviours of quantum correlation measured by a quantum discord between two uncoupled qubits, which are immersed in a common Ohmic environment. We show that the quantum discord of the two non-interacting qubits can be greatly amplified or protected for certain initially prepared X-type states in the time evolution. In particular, it is found that stable amplification of the quantum discord exists for the case of two identical qubits, and the quantum discord can be protected for the case of two different qubits with a large detuning. It is also indicated that in general a sudden change of the quantum discord occurs in the time evolution at a critical time point tc, and the discord amplification and protection may occur only in the time interval 0< t≤tc for certain X-type states. This sheds new light on the creation and protection of quantum correlation.
[en] It is well-known that the nonlinear coupling between a mechanical oscillator and a superconducting resonator or optical cavity can be used to generate a Kerr-nonlinearity for the cavity mode. We show that the strength of this Kerr-nonlinearity, as well as the effect of the photon-pressure force can be enormously increased by modulating the strength of the nonlinear coupling. We describe an electromechanical circuit where this enhancement could be readily realized. (fast track communication)
[en] We propose a scheme to enable a controllable cross-Kerr interaction between microwave photons in a circuit quantum electrodynamics (QED) system. In this scheme we use two transmission-line resonators (TLRs) and one superconducting quantum interference device (SQUID) type charge qubit, which acts as an artificial atom. It is shown that in the dispersive regime of the circuit-QED system, a controllable cross-Kerr interaction can be obtained by properly preparing the initial state of the qubit, and a large cross-phase shift between two microwave fields in the two TLRs can then be reached. Based on this cross-Kerr interaction, we show how to create a macroscopic entangled state between the two TLRs. (electromagnetism, optics, acoustics, heat transfer, classical mechanics, and fluid dynamics)
[en] In this paper, we study the global existence and decay rates of the solutions near Maxwellian for non-linear Fokker–Planck equations in the whole space. The global existence is proved by combining uniform-in-time energy estimates with local solution constructed by Picard type iteration sequence. The decay rates of the nonlinear model is obtained by using the precise spectral analysis of the linearized Fokker–Planck operator as well as the energy method. The nonlinearity in the model brings new difficulty to the energy estimates, which is resolved by additional tailored weighted-in-v energy estimates suitable for Fokker–Planck operators.
[en] We study the spectrum of single-photon emission and scattering in a mixed optomechanical model which consists of both linear and quadratic optomechanical interactions. The spectra are calculated based on the exact long-time solutions of the single-photon emission and scattering processes in this system. We find that there exist some phonon sideband peaks in the spectra and there are some sub peaks around the phonon sideband peaks under proper parameter conditions. The correspondence between the spectral features and the optomechanical interactions is confirmed, and the optomechanical coupling strengths can be inferred by analyzing the resonance peaks and dips in the spectra. (paper)
[en] The aim of the present study was to label EGCG with 125I and to determine its radiopharmaceutical potential in mice. EGCG was labeled with 125I using the iodogen method. The labeling yield and the radiochemical purity of 125I-EGCG were determined by radio thin-layer chromatography (RTLC). The Labeling yield was approximately 89.4 %. The radiochemical purity was approximately 96.4 %. The biodistribution studies of the labeled compound (specific activity; 0.47 TBq/μg) were performed in male Kunming mice. The uptakes of 125I-EGCG in some organs were determined at different time after injection to the mice. The radioactivity in each organ was counted and the percentage of injected activity per gram of tissue weight (%ID/g) for each organ and blood was calculated. Incorporation of radioactivity in the various tissue/organ was confirmed by microautoradiography. 125I-EGCG uptake in the stomach and salivary gland was higher than other organ/tissue. The black silver grains was concentrated in the nucleus, cytoplasm, intercellular substance and capillaries of that various organs, and its unevenly distributed. Thus, 125I-EGCG may be radiopharmaceutical for the imaging of the stomach and salivary gland. (author)