نتایج جستجو برای: carrier gas

تعداد نتایج: 314998  

Journal: :Journal of microencapsulation 2011
S H Bang I C Hwang Y M Yu E H Park H R Kwon H J Park

Chitosan-coated nano-liposomes containing etofenprox were prepared by ultrasonic homogenization (UH) and a combined use of UH and electro-spraying. The physicochemical properties of the resulting samples were examined and compared. The two methods yielded similar values and tendencies, except for encapsulation efficiency that differed by an average of 15%. In the coating process, as the chitosa...

Journal: :Advanced materials 2015
Jianyi Chen Bo Liu Yanpeng Liu Wei Tang Chang Tai Nai Linjun Li Jian Zheng Libo Gao Yi Zheng Hyun Suk Shin Hu Young Jeong Kian Ping Loh

High-quality large-sized hexagoal WSe2 crystals can be grown on dielectric substrates using atmospheric chemical vapor deposition in the presence of hydrogen gas. These hexagonal crystals (lateral width >160 um) have a carrier mobility of 100 cm(2) V(-1) s(-1) and a photoresponsivity of ≈1100 mA W(-1), which is comparable to that of exfoliated flakes.

Journal: :Optics letters 2014
Sergio Carbajo Eduardo Granados Damian Schimpf Alexander Sell Kyung-Han Hong Jeffrey Moses Franz X Kärtner

We report on efficient generation of millijoule-level, kilohertz-repetition-rate few-cycle laser pulses with radial polarization by combining a gas-filled hollow-waveguide compression technique with a suitable polarization mode converter. Peak power levels >85  GW are routinely achieved, capable of reaching relativistic intensities >10(19)  W/cm2 with carrier-envelope-phase control, by employin...

Journal: :Optics letters 2004
Jimmy Ng A H Kung András Miklós Peter Hess

With a laser-excited acoustic wave as the carrier wave and by modulation of the light wavelength of a multikilohertz-repetition-rate optical parametric oscillator at a lower frequency than the acoustic frequency, we demonstrate a wavelength-amplitude double-modulation technique and achieve an enhancement factor of 35 in sensitivity in photoacoustic trace gas detection with the technique.

Journal: :Clinical chemistry 1978
J Zamecnik D T Armstrong K Green

We describe the preparation of [2,4,16,16-2H4]estradiol-17 beta. The method for quantitative determination of subpicomole amounts of estradiol-17 beta (trimethylsilyl ether derivatives) by gas-liquid chromatography-mass spectrometry with multiple ion detector and with [2H4]estradiol-17 beta as the carrier is presented and characterized. Values for serum samples, as measured by radioimmunoassay ...

Journal: :Trends in biotechnology 1999
K B Jirage C R Martin

Recent advances in membrane-based separations include chiral separations, nanofiltration, ion-permselectivity, gas separation and pervaporation. Novel chiral separations using enzymes and chiral surfactants as carrier have been achieved using facilitated-transport membranes. Graft-copolymeric membranes have been constructed that possess pH-controlled ion selectivity, and membranes have been mad...

Journal: :Communications in Physics 2021

We investigated the effect of bias voltage and carrier gas on hydrogen sensing performance tungsten oxide nanobeads. The nanobeads were prepared by a template-assisted method followed calcination. porous single walled carbon nanotube thin film was used as sacrificed template for deposition tungsten, thermal calcination at high temperature to oxidize W into WO3 burn out template. crystal structu...

Journal: :Lab on a chip 2011
Jing Liu Naveen K Gupta Kensall D Wise Yogesh B Gianchandani Xudong Fan

This paper reports the investigation of a micro-gas chromatography (μGC) system that utilizes an array of miniaturized motionless Knudsen pumps (KPs) as well as microfabricated separation columns and optical detectors. A prototype system was built to achieve a flow rate of 1 mL min(-1) and 0.26 mL min(-1) for helium and dry air, respectively, when they were used as carrier gas. This system was ...

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