Electronic Beam Steering Metamaterial Antenna with Dual-Tuned Mode of Liquid Crystal Material.

In this study, a dual-tuned mode of liquid crystal (LC) material was proposed and adopted on reconfigurable metamaterial antennas to expand the fixed-frequency beam-steering range. The novel dual-tuned mode of the LC is composed of double LC layers combined with composite right/left-handed (CRLH) transmission line theory. Through a multi-separated metal layer, the double LC layers can be loaded with controllable bias voltage independently.

[Identifying the Sources of Groudwater NO-N in Agricultural Region of Qingdao].

To increase crops yields, applying large amounts of fertilizers has become increasingly common in agricultural regions, resulting in NO-N groundwater pollution. Agricultural non-point pollution is the main source of groundwater NO-N pollution. To ensure drinking water safety and quality, it is crucial to clarify the sources of NO-N pollution in agricultural regions.

[Effects of organic and inorganic fertilizers on emission and sources of NO in vegetable soils].

To clarify the microbial pathway of the NO production and consumption under different fertilizers and provide theoretical basis for the reduction of NO emission and rational management of fertilization in vegetable soils, we examined dynamics of NO flux and isotope signatures under different fertilizer treatments in the vegetable soils of Beijing, by setting up four treatments (organic-acetylene, organic-nonacetylene, inorganic-acetylene, inorganic-nonacetylene) and using the stable isotope technique of natural NO abundance. The results showed that the cumulative NO emission from organic-acetylene group, organic-nonacetylene group, inorganic-acetylene group and inorganic-nonacetylene group was (374±37), (283±34), (458±36), (355±41) g·m in cabbage growing season, respectively. NO fluxes were significantly lower in treatments with organic fertilizer than those with inorganic fertilizer and significantly higher in acetylene group than nonacetylene group.

[A review on development of stable isotope technique in the studies of NO formation mechanism].

As one of three major greenhouse gases, nitrous oxide (NO) has solicited substantial attention. Stable isotope has been widely used to explore the sources of NO emissions. Here, we briefly introduced the microbial processes involved in NO emissions, and the main influencing factors.

[Effects of soil water condition on NO emission and its sources in vegetable farmland of North China Plain].

To understand the mechanisms of agricultural NO emission, we investigated the NO emission dynamics, the NO isotope signatures, and the site preference value under different soil water conditions in the vegetable farmland of North China, by using the stable isotope technique and the acetylene inhibition method. The results demonstrated that NO emission was significantly affec-ted by the water condition, and NO emissions from soil with water-filled pore space (WFPS) of 70% were significantly higher than that with 50% WFPS. NO emission occurred mostly in the early stage of fertilization, and decreased rapidly in the later stage of fertilization.

Controlling the Formation of Nanocavities in Kirkendall Nanoobjects through Sequential Thermal Ex Situ Oxidation and In Situ Reduction Reactions.

Controlling the porosity, the shape, and the morphology of Kirkendall hollow nanostructures is the key factor to tune the properties of these tailor-made nanomaterials which allow in turn broadening their applications. It is shown that by applying a continuous oxidation to copper nanowires following a temperature ramp protocol, one can synthesize cuprous oxide nanotubes containing periodic copper nanoparticles. A further oxidation of such nanoobjects allows obtaining cupric oxide nanotubes with a bamboo-like structure.

[In vivo expression of green fluorescent protein gene and immunogenicity of ES312 vaccine both mediated by starburst polyamidoamine dendrimers].

Objective: To study the expression of green fluorescent protein gene and immunogenicity of ES312 vaccine both mediated by Starburst polyamidoamine (PAMAM) dendrimers in vivo.

Methods: The complex of green fluorescent protein or ES312 gene with Starburst PAMAM dendrimers were injected intramuscularly in Balb/c mice. The expression level and distribution of green fluorescent protein gene was detected by flow cytometer, Western blot and immunofluorescence assay.