[FBG Self-Chirped Based on an Sine-Structure].

Considerting that the uniform grating can be induced chirp effect under non-uniform strain, a method of making chirp grating by uniform grating with the use of sine structure is proposed. The sine structure was designed as basal material while the fiber Bragg and grating was pasted in the strain non-uniform area of basal material. the strain it produced was introducied into FBG gate area by applying tensile load to achieve FBG produce chirp effect.

[Progressive damage monitoring of corrugated composite skins by the FBG spectral characteristics].

In the present paper, a method of monitoring progressive damage of composite structures by non-uniform fiber Bragg grating (FBG) reflection spectrum is proposed. Due to the finite element analysis of corrugated composite skins specimens, the failure process under tensile load and corresponding critical failure loads of corrugated composite skin was predicated. Then, the non-uniform reflection spectrum of FBG sensor could be reconstructed and the corresponding relationship between layer failure order sequence of corrugated composite skin and FBG sensor reflection spectrums was acquired.

[A comprehensive surveillance on HIV among 1,237 men who have sex with men in thirteen cities of Yunnan].

Objective: To understand the knowledge, risk behaviors and HIV prevalence in men who have sex with men (MSM) in thirteen cities.

Methods: Target samples were chosen using the snowball-rolling method, with transverse KABP and HIV-antibody testing developed for those MSM in thirteen cities of Yunnan.

Results: A total of 1237 valid questionnaires and 1129 blood samples were collected.

[Spectral analysis of fiber bragg grating modulated by double long period grating and its application in smart structure monitoring].

Spectrum of fiber bragg grating (FBG) sensor modulated by double long period grating (LPFG) is proposed in the paper. Double LPFG consists of two LPFGS whose center wavelengths are the same and reflection spectrum of FBG sensor is located in linear range of double LPFG transmission spectrum. Based on spectral analysis of FBG and double LPFG, reflection spectrum of FBG modulated by double LPFG is obtained and studied by use of band-hider filter characteristics for double LPFG.

[Analysis of the epidemiologic patterns of HIV transmission in Dehong prefecture, Yunnan province].

Objective: To uncover the transmission patterns of the HIV epidemic in Dehong prefecture.

Methods: The reviewed case reports, data of sentinel surveillance, testing and special survey were analyzed by SAS 8.0 program.

[Current situation and influential factors concerning the sexual transmission of HIV in Dehong prefecture, Yunnan province].

Objective: To investigate the current situation of the sexual transmission of HIV in Dehong prefecture, analyze the influential factors, and provide support for drafting pertinent preventive interventions in the future.

Methods: We had analyzed the data of case report from 2005 to 2007, and the prostitutes surveillance data from 2003 to 2007. A special survey was conducted from October 26 to November 7, 2007.

[Analysis for epidemic trend of acquired immunodeficiency syndrome in Yunnan Province of China].

Objective: To understand epidemiologic characteristics and changes in epidemic trend of human immunodeficiency virus infection and acquired immunodeficiency syndrome (HIV/AIDS) in different areas and populations of Yunnan Province.

Methods: Seroepidemiological studies were conducted in injection drug users (IDUs), women sex workers, whoring goers, patients with sexually transmitted disease (STD), patients with tuberculosis, pregnant women and blood donors with sentinel surveillance, ad hoc investigations, regular case-finding and data collection during 1989 to 2003 in Yunnan Province.

Results: Relatively high prevalence of HIV/AIDS was firstly found in IDUs from border areas of the province in 1989.