Enhanced iodinated disinfection byproducts formation in iodide/iodate-containing water undergoing UV-chloramine sequential disinfection: Machine learning-aided identification of reaction mechanisms.

Restricted to the complex nature of dissolved organic matter (DOM) in various aquatic environments, the mechanisms of enhanced iodinated disinfection byproducts (I-DBPs) formation in water containing both I and IO (designated as I/IO in this study) during the ultraviolet (UV)-chloramine sequential disinfection process remains unclear. In this study, four machine learning (ML) models were established to predict I-DBP formation by using DOM and disinfection features as input variables. Extreme gradient boosting (XGB) algorithm outperformed the others in model development using synthetic waters and in cross-dataset generalization of surface waters.

[Optical Path Difference Analysis and Simulation of Four Typical Rotary Type Interferometer].

The four kinds of the structure characteristics of rotary type interferometer are mainly analyzed from the classical Michelson interferometer structure in the paper. The Optical path difference between the interferometer and the rotation angle is also analyzed. By setting parameters, the four kinds of rotary type optical path difference of the interferometer are simulated based on the optical path difference formula.

[A Quantitative Analysis Method of Water-Soluble Inorganic Ions with ATR-FTIR Spectroscopy].

A method of fast nondestructive determination of three kinds of water-soluble inorganic ions including SO₄²⁻, NO₃⁻ NH₄⁺ in aerosol was disscussed. The method of IC measurement values was used on the control of the three kinds of inorganic ion content. The quantitative calibration models of the inorganic ions were developed by using ATR-FTIR spectroscopy combined with PLS algorithm and the model was evaluated.

Bacillus radicibacter sp. nov., a new bacterium isolated from root nodule of Oxytropis ochrocephala Bunge.

A Gram-positive, facultative anaerobic, rod-shaped, and endospore-forming strain, designated 53-2(T) was isolated from the root nodule of Oxytropis ochrocephala Bunge growing on Qilian mountain, China. The strain can grow at pH 7.0-8.

Diaphorobacter ruginosibacter sp. nov., isolated from soybean root nodule, and emended description of the genus Diaphorobacter.

A gram-negative bacterium designated BN30(T), which is motile with a polar flagellum, non-endospores forming, oxidase- and catalase-positive, was isolated from soybean root nodule. The organism is facultative anaerobic and surface-wrinkled rod. It can grow at 10-40 °C, pH 6-8 and 6 % (w/v) NaCl.

[Remote sensing of seasonal variation in column concentration of atmospheric CO2 and CH4 in Hefei].

In order to observe two kinds of greenhouse gases, CO2 and CH4, making the biggest contribution to global warming, a ground-based Fourier transform near-infrared spectral remote sensing system was developed to record the perpendicular incidence sun spectra from February 2012 to April 2013 in Hefei continuously. The measured total transmittances in the atmosphere were obtained from perpendicular incidence sun spectra. Methods of line-by-line and low-order polynomial approximation were used to model the total atmospheric transmittances in forward model.

[Quantitative analysis of nitrate in atmospheric particulates PM2.5 with Fourier transform infrared spectroscopy].

Airborne fine particulate matter PM2.5 as one of composite core pollutants of air pollution is concerned and NO as one of the main components of water-soluble ions has an important impact on precipitation and human health, so searching a method of rapid and reliable detection is an important work. According to advantages of the Fourier transform infrared spectroscopy technology, the infrared spectrum of NO3- in NH4NO3 was compared with PM2.

[Optical properties research of NH4NO3 by Fourier transform infrared spectroscopy].

In the present paper, the infrared spectrum of aerosol and NH4 NO3 was analysed and compared, and the result showed that the infrared spectral features of aerosol are consistent with that of NH4 NO3. The absorption coefficient alpha and the mass absorption cross section kappa of NO3- was calculated by the transmissivity of NO3- in NH4 NO3 according to Beer-Lambert law. Then the imaginary part of the complex refractive index was calculated through alpha.

[Optical properties research of Bacillus subtilis spores by Fourier transform infrared spectroscopy].

The authors measured IR transmission spectra of two different concentrations of Bacillus subtilis spores by using Fourier transform infrared spectroscopy (FTIR) technology. The mass extinction cross section k of Bacillus subtilis spores was calculated according to Lambert-Beer law and the imaginary part n(i) of the complex refractive index was also calculated through k. The real part n(r) of the complex refractive index was derived from the KK (Kramers-Kronig) relationship and the experimental results were also analyzed and discussed with the study of measurement and analysis method of the complex refractive index on Bacillus subtilis spores, it is of great significance to further research the absorption and scattering characteristics, and to broaden the measurement and remote sensing technology method of the biological aerosols.

Rhizobium qilianshanense sp. nov., a novel species isolated from root nodule of Oxytropis ochrocephala Bunge in China.

During a study of the diversity and phylogeny of rhizobia isolated from root nodules of Oxytropis ochrocephala grown in the northwest of China, four strains were classified in the genus Rhizobium on the basis of their 16S rRNA gene sequences. These strains have identical 16S rRNA gene sequences, which showed a mean similarity of 94.4 % with the most closely related species, Rhizobium oryzae.

[Monitoring and analysis of urban ozone using open path Fourier transform infrared spectrometry].

An ozone monitoring system was developed by the method of open path Fourier transform infrared (OP-FTIR) spectrometry based on our FTIR spectrometer. In order to improve measurement precision and detection limit, the quantitative analysis was completed to get ozone concentration by combining synthetic background spectrum method which uses information from HITRAN database and instrumental line shape, and nonlinear least squares (NLLSQ) method. The measurement methods for system detection limit were discussed and the result is 1.

[Ozone concentration inversion based on multi-reflected cell FTIR spectra and correlation analysis].

The stratosphere ozone plays the protective action role for human and the ground-level ozone is harmful to human health. Monitoring ozone with different ways and methods took an active part in understanding distribution and transformation of ozone, which was useful to controlling pollution emission. Spectra were got by multi-reflected white cell Fourier transform infrared (FTIR) spectrometer, inversed with nonlinear least squares (NLLSQ) method and then the concentrations of ozone were got exactly.

[Effects of organic fish protein liquid fertilizer on enzyme activities and microbial biomass C and N in a silt soil].

By the method of thermostatic culture, this paper studied the effects of different application rates (0.5, 1.5, and 2.

[Passive remote measurement of flame infrared image by a FTIR scanning imaging system].

The present paper introduced a FTIR scanning imaging system. This system is based on the combination of a FTIR spectrometer and a scanning mirror. So it has the advantage of FTIR spectrometer: non-contact, real-time, celerity, nicety and high sensitivity.

[The study of instrument response function of FTIR detectors].

FTIR spectrometer detectors have different instrument response function in different wave band. In application, no matter absolute or relative intensity of spectrum the authors use, the authors should calibrate the instrument with standard blackbody to find the instrument response function. In the present paper, the authors study the instrument response function of detectors (InSb detector and MCT detector) in Canada MOMAN MR154 FTIR spectrometer.

[A method of eliminating the water vapor interference simultaneously in open path FTIR measurement by instrumental line shape correction].

Water vapor absorption, which exists in mid-infrared region, is an interferential element for infrared spectra analysis. A new method, which can be used to eliminate the water vapor interference in FTIR measurement, is presented. To calculate the high resolution absorbance of water vapor, a fast line by line method which computed with the HITRAN database (eg.

[Initial study of a new method for measuring the temperature of hot gas by FTIR spectrometry].

The present paper analyzed the molecular spectra theory detailedly and summarized the factors affecting the structure and intensity-distribution of molecular rotation-vibration spectra. The authors knew that every spectral line's relative intensity is only related to external temperature. According to this conclusion.