Dispersion Engineering of Silicon Nitride Microresonators via Reconstructable SU-8 Polymer Cladding.

In this work, we propose a novel way to flexibly engineer the waveguide dispersion by patterning the cladding of waveguide microresonators. Experimentally, we demonstrate silicon nitride waveguides with air-, oxide-, and SU-8 polymer-cladding layers and compare the corresponding waveguide dispersion. By integrating SU-8 polymer as the outer cladding layer, the waveguide dispersion can be tuned from -143 to -257 ps/nm/km.

[Effect of Biochar on the Adsorption Characteristics and Adsorption Mechanisms of Ammonia Nitrogen in Rainfall Runoff].

In order to study the performance and mechanisms of bioretention pond media ( biochar) for NH-N removal in rainfall runoff, three kinds of alkali modified biochars (marked as BC1, BC2, and BC3) were prepared with various concentrations of NaOH solution (1, 2, and 3 mol·L) to explore their adsorption performance for NH-N. The results showed that:① Appropriate modifications of the NaOH concentration increased the specific surface area and surface microstructure of biochar, with the content of O and the surface functional groups being enriched. In addition, BC2 possessed the best adsorption performance.

[Effect and Approach of Biochar to Improve Coastal Saline Soil].

The use of biochar to improve adversity of soil has received increasing attention. biochar is used to repair coastal saline-alkali soil, which can not only utilize but can also increase the scale of the coastal land reserve. In this study, the method of soil culture experiments was used to explore the effect and pathway of 0%-3% addition of on the improvement of saline-alkali soil.

[Water Purification Effect and Saline-alkali Tolerance Improvement Mechanism of in the Estuary Area].

The pollution load of nitrogen and phosphorus in pollutants entering the sea is high, which seriously affects the water quality of coastal water. It is necessary to strengthen land-sea coordination. However, affected by the seawater encroachment, the salt and alkali content of the water in the estuary area is high and the variation range is large, which leads to difficulty in plant growth.

[Characteristics of Biochars and Their Adsorption Performance and Mechanisms for Cr(Ⅵ)].

This study aims to understand the recycling process of by using the slow pyrolysis technology to prepare biochars under different temperatures and by characterizing the physicochemical properties of biochars. The results showed that a relatively high level pyrolysis of could be reached when the temperature was up to 400℃. The yield rate and the ash content of biochars were negatively correlated with the pyrolysis temperature, while the carbon content was positively correlated.

[Purification of Slightly Salt-alkaline Water Bodies by Microorganism Enhanced Combined Floating Bed].

In order to study the purifying effect of combined floating bed constucted by salinity plant and microorganisms on the slightly salt-alkaline water, blank floating bed A, floating bed B, microbes floating bed C and + microorganisms combined floating bed D were established, and slightly salt-alkaline eutrophic water body (pH 8.5-9.0, salinity 5‰-7‰) was purified under continuous flow conditions in the laboratory.

Piriformospora indica promotes growth, seed yield and quality of Brassica napus L.

In current scenario, crop productivity is being challenged by decreasing soil fertility. To cope up with this problem, different beneficial microbes are explored to increase the crop productivity with value additions. In this study, Brassica napus L.

[A Contrastive Study on Salt-alkaline Resistance and Removal Efficiency of Nitrogen and Phosphorus by Phragmites australis and Typha angustifolia in Coastal Estuary Area].

The salt and alkali contents were so high that the ecological landscape was depressed in water body of a coastal estuary area. Screening some plants which could not only tolerate saline-alkaline but also effectively remove nitrogen and phosphorus was therefore in urgent need. The tolerance range and removal rate of nitrogen and phosphorus by Phragmites australis and Typha angustifolia under salt and pH stress were investigated by hydroponic experiments.

[Variation of nitrogen during the high suspended sediments concentration water supply in an artificial shallow lake].

The effect of water quality and suspended sediments in the process of water supply is of an increasing concern recently in an artificial shallow lake. The water supply from the Yellow River to Dongchang Lake happened on April 23rd to 25th, 2012. The synchronous monitoring of flow velocity, suspended sediment concentration, dissolved nitrogen and particulate nitrogen concentration was conducted during the three days in five monitoring sites of the longitudinal profile from inlet to outlet.

Role of the reduction site in the fluorinated or sulfated TiO2 photocatalytic process.

In this article, the effects of TiO2 surface fluorination and sulfation, on the active oxygen species formed at the reduction site in the photocatalytic process, namely O2*- and H2O2, were investigated from a new perspective. The superoxide radical, (O2*-), was determined by colorimetry of nitroblue tetrazolium, a prominent O2*- scavenger. Hydrogen peroxide (H2O2) was estimated by using the iodide-starch method.

Enhanced photocatalytic activity of TiO2 by surface fluorination in degradation of organic cationic compound.

Experiments were carried out to investigate the influence of TiO2 surface fluorination on the photodegradation of a representative organic cationic compound, Methylene Blue (MB). The electropositive MB shows poor adsorption on TiO2 surface; its degradation performs a HO-radical-mediated mechanism. In the F-modified system, the kinetic reaction rate enlarged more than 2.