Jayanta Guha

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Thallium (Tl) contamination in soils poses a significant threat to human health due to the high toxicity of Tl and its ready assimilation by crops. This study is focused on high concentrations of Tl in soils in the Lanmuchang area of southwest Guizhou, China, which is related to natural processes of Tl-rich sulfide mineralization. Thallium contents range(More)
This paper illustrates a real environmental concern and draws attention to the fact that natural processes can mobilize thallium (Tl), a highly toxic metal, which may enter the food chain as a "hidden health killer" with severe health impacts on local human population. Natural processes may be exacerbated by human activities such as mining and farming, and(More)
Little is known in the literature about thallium (Tl) exposure from naturally occurring Tl contamination. This paper draws attention to the potential health risk posed by high concentrations of naturally occurring Tl in the environment. The inhabitants of a rural area of southwest Guizhou Province, China, reside within a natural Tl accumulated environment(More)
Thymol is obtained as a crystalline substance from the volatile oils of Thymus vulgaris (N. O. Labiatcc), Monarda unctata (Ar. 0. Lcibicitcc), and Carum copticuni (N. O. Umbellifarce). This latter plant is largely cultivated in Central India and the United Provinces and thymol, locally known as ajazvan kc fool, is prepared from its oil, the ptychotis oil or(More)
Reduction of electrical parameter variation is essential to achieve high yield and reliability in semiconductor devices. However, variation depends on a large number of process factors, which are often interdependent. In this work, well-calibrated Technology Computer-Aided-Design process and device simulations were performed in a designed experiment to(More)
We have studied the recombination of O atoms on an anodized Al surface in an oxygen plasma, using a new "spinning wall" technique. With this method, a cylindrical section of the wall of the plasma reactor is rotated and the surface is periodically exposed to an oxygen plasma and then to a differentially pumped mass spectrometer (MS). By varying the(More)
We report a new method for studying surface reactions and kinetics at moderately high pressures (<10 Torr) in near real time. A cylindrical substrate in a reactor wall is rotated at up to 200,000 rpm, allowing the surface to be periodically exposed to a reactive environment and then analyzed by a triple-differentially pumped mass spectrometer in as little(More)
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