Beam Steering Using Momentum-Reconfigurable Goubau Meta-Line Radiators.

Spoof/designer surface plasmon polaritons (SPP) and Goubau line belong to the same category of single-conductor surface waveguide. They feature easy integration and high field confinement capability, and hence are good candidates for wave guiding and radiating at terahertz frequencies. Here, we propose a momentum-reconfigurable Goubau meta-line radiator that is capable of digitally steering its beam at a fixed frequency, in contrast to conventional SPP or Goubau line radiators relying on changing frequencies to steer beams.

Random Combinatorial Gradient Metasurface for Broadband, Wide-Angle and Polarization-Independent Diffusion Scattering.

This paper proposes an easy, efficient strategy for designing broadband, wide-angle and polarization-independent diffusion metasurface for radar cross section (RCS) reduction. A dual-resonance unit cell, composed of a cross wire and cross loop (CWCL), is employed to enhance the phase bandwidth covering the 2π range. Both oblique-gradient and horizontal-gradient phase supercells are designed for illustration.

Continuous Beam Steering Through Broadside Using Asymmetrically Modulated Goubau Line Leaky-Wave Antennas.

Goubau line is a single-conductor transmission line, featuring easy integration and low-loss transmission properties. Here, we propose a periodic leaky-wave antenna (LWA) based on planar Goubau transmission line on a thin dielectric substrate. The leaky-wave radiations are generated by introducing periodic modulations along the Goubau line.

An epidemiology study of bronchial asthma in the Li ethnic group in China.

Objective: To investigate the prevalence and risk factors of bronchial asthma in the Li ethnic group in Hainan, China.

Methods: This study employed a stratified random sample design using custom-designed questionnaires. Subjects with asthma-like symptoms were first identified by two rounds of surveys and then confirmed by respiratory physicians using pulmonary function test, bronchial dilation test and challenge test.

[Prevalence and risk factors of bronchial asthma among Li nationality in Hainan province].

Objective: To study the risk factors of bronchial asthma of Li nationality in Hainan.

Methods: A total of 13 050 subjects of Li nationality were selected by random unequal ratio stratified cluster sampling method from southern, central and western part of Hainan and investigated with Hainan Epidemiological Asthma Survey Questionnaire of Li Nationality. There were 441 cases of bronchial asthma, and 1296 cases of control that were sampled by random number table method.

[Prevalence survey on bronchial asthma of Li nationality in Hainan from 2003 to 2007].

Objective: To learn the prevalence rate and distribution of bronchial asthma of Li nationality in Hainan by epidemiological survey so as to provide rationales for preventing and treating asthma.

Methods: A total of 13 050 subjects of Li nationality in Hainan were investigated by random sampling of stratified cluster method with an unequal ratio according to the medical records, physical signs and symptoms and pulmonary function tests. Then the prevalence was analyzed according to different population characteristics.

[Association of polymorphisms of N372H in BRCA2 gene and 135G/C in RAD51 gene and breast cancers].

Objective: To determine the associations between the polymorphisms of N372H in BRCA2 gene and 135G/C in RAD51 gene and breast cancers.

Methods: The allele and genotype frequencies of N372H in BRCA2 gene and 135G/C in RAD51 gene were analyzed with denaturing high performance liquid chromatography (DHPLC) and polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) in 71 women with breast cancers and 85 normal, women.

Results: The women with breast cancers had higher frequencies of genotype HH of the N372H locus in BRCA2 gene than the normal women.

Health risk evaluation for the inhabitants of a typical mining town in a mountain area, South China.

A previous study investigated metal contamination in farmland and the air in a typical mining town of Guangxi, South China. In this study, the health risks associated with exposure to this contamination that were evaluated for the following routes of exposure are reported: inhalation, dermal contact, ingestion of dust, and ingestion of homegrown vegetables. The findings demonstrated that the inhabitants were at high risk for noncancer effects posed by some of the metals.

The three networks framework to deal with public health emergencies in Guangxi, China.

Objective: To improve the detection and control of infectious diseases in Guangxi, China.

Setting/participants: Guangxi province in southwest China has almost 50 million people, of whom approximately 30% reside in urban and 70% in rural areas. There are 12 minority nationality groups living in the region.

[A related analysis for alpha, beta fibrinogen gene haplotypes and nucleotide polymorphisms associated with the ischemic stroke in Hainan Han population].

Objective: To analyze the association of that the polymorphisms and haplotypes of Taq I site in beta fibrinogen gene and the single nucleotide sites -455 G/A, -249 C/T, -148 C/T, +1689T/G, Bsm A I G/C, 448 G/A, Bcl I G/A, Hinf I A/C in beta-fibrinogen gene are linked up with the ischemic stroke(IS).

Methods: Turbidmetric assay was used to measure the plasma fibrinogen level of one hundred and sixty cases with ischemic stroke and one hundred and thirty healthy individuals from Hainanese Han population. The polymorphisms and genotypes were characterized by PCR-RFLP.

[Nine polymorphisms of fibrinogen gene and their association with plasma fibrinogen levels in Hainan Han population].

Objective: To investigate the allelic frequencies of polymorphisms of alpha Taq I and beta Bcl I, Hinf I A/C, 448 G/A, beta BsmA I G/C, +1689T/G, -148C/T, -249C/T, -455G/A in Hainan Han population and their association with plasma fibrinogen level.

Methods: Turbidmetric assay was used to measure plasma fibrinogen level of two hundred and thirty-eight healthy individuals. The genotypes were characterized by PCR-RFLP and sequence analysis.

[Synthesis and radiopharmacology of S-(2-18F-fluoroethyl)-L-methionine for tumor imaging].

Aim: To develop S-(2-18F-fluoroethyl)-L-methionine (18FEMET) as an amino acid positron emission tomography (PET) tracer for tumors, and to evaluate the value of 18FEMET in the differentiation of experimental tumor and experimental inflammation.

Methods: 18FEMET was prepared by nucleophilic fluorination reaction via a two-step procedure. Biodistribution of 18FEMET in normal mice, carcinoma-bearing mice and inflammatory mice, and 18FEMET PET imaging for carcinoma-bearing mice and inflammatory mice were performed compared with 2-[18F] fluoro-2-deoxy-D-glucose (FDG) and O-(2-[18F] fluoroethyl)-L-tyrosine (FET).