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30 results on '"Wang, Jian Jim"'

7. Fingerprint natural soil N2O emission from nitration and denitrification by dual isotopes (15N and 18O) and site preferences

Author

Xianguo Lu, Wang Jian Jim, and Zhongsheng Zhang

Subjects
Denitrification, 010504 meteorology & atmospheric sciences, Isotope, Ecology, δ18O, Stable isotope ratio, 010401 analytical chemistry, chemistry.chemical_element, Biogeochemistry, General Medicine, δ15N, 01 natural sciences, Nitrogen, 0104 chemical sciences, chemistry, Environmental chemistry, Environmental science, Nitrification, 0105 earth and related environmental sciences
Abstract

Nitrification and denitrification are the main contributors to soil N2O production and emission, and distinguishing their contributions to N2O emission under natural conditions is vital to deciphering nitrogen biogeochemistry. Stable isotopes have provided insight to resolve this problem, of which δ15N2Obulk (15N abundance in N2O), dual isotopes (δ15N, δ18O) and site preference (SP) are the most effective methods currently. δ15N2Obulk is useful in tracing substrates yielding N2O, but it is helpless to make accurate differentiation between nitrification and denitrification; The dual isotopes, δ15N and δ18O, introduce O atom sources in partitioning N2O source and this method could roughly apportion N2O from nitrification and denitrification. However, expensive equipment requirements and the inherent uncertainties on δ18O determination owning to few data available hamper its accuracy and applicability on distinguishing nitrification and denitrification. Site preference (SP) provides new insight on distinguishing contribution of nitrification and denitrification on N2O emission and results in more accuracy results. We summarized that the average values of δ15N2Obulk, δ18O and SP during denitrification, which were − 29.29‰, 19.78‰, and 2.43‰, respectively, are much lower than the corresponding values during nitrification, which were − 7.87‰, 48.03‰ and24.14‰, respectively.

Published
2016

8. Nanofabricated isolators address low-cost FTTH

Author

Graham, Alan C. and Wang, Jian Jim

Subjects
Fiber optic networks -- Prices and rates, Fiber optic networks -- Usage, Optical instruments -- Usage, Transceivers -- Usage, Fiber transmission equipment, Transceiver, Company pricing policy, Business, Telecommunications industry
Abstract

The fiber to the home infrastructure necessary to meet consumer demands for voice, data, and video has fueled the growth of transceiver sales over the last year. Transceiver vendors have [...]

Published
2005

30. Demonstration of inscription and ablation of phase masks for the production of 1st, 2nd, and 3rd order FBG gratings using a femtosecond laser

Author

Ian Bennion, Kyriacos Kalli, Graham N. Smith, Kate Sugden, Suleski, Thomas J., Schoenfeld, Winston V., and Wang, Jian Jim

Subjects
Diffraction, Optical fiber, Materials science, business.industry, Physics::Optics, Laser, law.invention, Optics, Fiber Bragg grating, Interference (communication), law, Femtosecond, Talbot effect, business, Diffraction grating
Abstract

We present to the best of our knowledge the first example of femtosecond laser inscription/ablation of phase/amplitude masks for the demonstrated purpose of inscribing Bragg gratings in optical fibers. We show that the utilization of a femtosecond laser for the mask production allows for great flexibility in controlling the mask period. The masks are used to produce 1 st , 2 nd and 3 rd order fiber Bragg gratings (FBGs) in SMF-28. The work demonstrates the proof of concept and flexibility for the use of femtosecond lasers for the rapid prototyping of complex and reproducible mask structures. Our inscription studies are augmented by considerations of three-beam interference effects that occur as a result of the strong zeroth-order component that is present in addition to higher-order diffraction components.

Published
2009

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