نتایج جستجو برای: conductivity detector
تعداد نتایج: 108981 فیلتر نتایج به سال:
Under the appropriate separation conditions the pulsed discharge helium ionization detector (PDHID) was used to detect hydrogen and methane separated from the matrix components of human breath samples. The sensitivity of this method is over an order of magnitude better than published methods using a flame ionization detector (FID) and a thermal conductivity detector (TCD), and has the further a...
The in-plane and cross-plane thermal conductivities of the cladding layers and active quantum wells of interband cascade lasers and type-II superlattice infrared detector are measured by the 2-wire 3ω method. The layers investigated include InAs/AlSb superlattice cladding layers, InAs/GaInSb/InAs/AlSb W-active quantum wells, an InAs/GaSb superlattice absorber, an InAs/GaSb/AlSb M-structure, and...
The aim of the paper was the identification and the quantitative evaluation of the following inorganic anions: chloride, phosphate, nitrate, nitrite, sulphate and the following organic acids: lactic, acetic, formic, malic and citric in commercial "unrefined" brown cane sugars and in cane raw sugars. The determination was carried out by high performance anion exchange chromatography with conduct...
The objective of this paper consists in defining the interest of a new high-performance ion chromatography method (HPIC) with chemically suppressed conductivity detector for phytic acid determination in food samples. Firsly, accuracy and precision of the HPIC method have been measured. Secondly, The HPIC method and a classical absorptiometric method were compared. The HPIC method was more sensi...
We demonstrate that the conductance of a field-effect transistor ~FET! gated by a layer of nanometer-sized quantum dots is sensitive to the absorption of single photons. Rather than relying upon an avalanche process, as in conventional semiconductor single-photon detectors, the gain in this device derives from the fact that the conductivity of the FET channel is very sensitive to the photoexcit...
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