We predict a new electron pair tunneling (PT) resonance in nonlinear transport through quantum dots with positive charging energies exceeding the broadening due to thermal and quantum fluctuations. The PT resonance shows up in the single-electron transport (SET) regime as a peak in the derivative of the nonlinear conductance, d(2)I/dV(2), when the electrochemical potential of one electrode matc...

Time-resolved photoluminescence has been used to study the effects of interface roughness on excitonic transitions in GaAs-Al, Ga& As multiple quantum ~elis. In addition to the luminescence linewidth broadening and Stokes red shift, the interface roughness also strongly a8'ects the dynamic process of optical transitions so that the excitonic transition peak shifts with delay time. However, the ...

Recent Raman data on nanocrystallite arrays are revised within the microscopic theory for peaks positions and broadening (linewidth). The combines elasticity theory-like approach optical phonons used in order to evaluate structure Green's function method applied phonon lines broadening. These theories supported by atomistic calculations dynamical matrix bond polarization model calculate intensi...

Abstract This paper addresses the bandwidth problem of ultrasonic transducers, and a frequency band broadening technique based on multi-frequency impedance network coupling is proposed. Based extended BVD circuit model, three coupled circuits including one first-order two second-order are designed. The inductor-capacitor value series-parallel connection method reasonably chosen for tuning to ac...

We investigated the efficacy and utility of a post-column derivatization method for the detection of amines with o-phthalaldehyde (OPA) in ultra high-performance liquid chromatography (UHPLC). Since it was anticipated that a derivatization reaction system placed downstream of the column would give considerable band broadening to narrow peaks generated by a UHPLC column, we examined the contribu...

Various methods for accurately determining ion species' current fractions using E x B probes in Hall thruster plumes are investigated. The effects of peak broadening and charge exchange on the calculated values of current fractions are quantified in order to determine the importance of accounting for them in the analysis. It is shown that both peak broadening and charge exchange have a signific...

The present work describes ultrafast thermalized and hot hole transfer processes from photo-excited CdSe quantum dots (QDs) and CdSe/ZnS core-shell QDs (CSQDs) to newly synthesized thiols. Three thiols namely 2-mercapto-N-phenylacetamide (AAT), 3-mercapto-N-phenylpropanamide (APT) and 3-mercapto-N-(4-methoxyphenyl) propanamide (ADPT) were synthesized and their interaction with both CdSe QDs and...

Molecularly imprinting polymers (MIPs) have been extensively applied in chromatography for the separation of chiral drugs. In this review, we mainly summarize recent developments of various MIPs used as chiral stationary phases (CSPs) in high performance liquid chromatography (HPLC), capillary electrochromatography (CEC), and supercritical fluid chromatography (SFC). Among them, HPLC has the ad...

When a difficult separation cannot be accomplished by changing the column and mobile phase conditions, two alternate methods are available. The most common approach is to increase the column length with identical packing material, and the second approach is to recycle the sample through the column. However, the former approach might lead to a limitation to the separation efficiency due to an in...

Various methods for accurately determining ion species’ current fractions using E B probes in Hall thruster plumes are investigated. The effects of peak broadening and charge exchange on the calculated values of current fractions are quantified in order to determine the importance of accounting for them in the analysis. It is shown that both peak broadening and charge exchange have a significan...