[Impact of Social Capital on Residents' Choice of Medical Institutions: A Study Based on Classification Tree Model and Logistic Regression].

Objective: To explore the influence of social capital on the local residents' choice of medical institutions and to provide a reference basis for promoting diagnosis and treatment services available at different tiers. Methods: A classification tree model was established using the exhaustive chi-square automatic interaction detection (Exhaustive CHAID) method to screen for factors influencing the residents' choice of medical institutions, and a logistic regression model was used to quantitatively analyze the interaction effect of the influencing factors. Results: The classification tree model showed that there were four layers and eight terminal nodes, identifying a total of six influencing factors, including individual social capital, self-reported physical health, education, community social capital, chronic disease prevalence, and self-reported mental health. Logistic regression analysis showed that education (odds ratio [OR]=0.660, 95% confidence interval [CI]: 0.502-0.869), community social capital (OR=0.746, 95% CI: 0.589-0.943), and individual social capital (OR=0.405, 95% CI: 0.287-0.572) (P<0.001) had an impact on residents' choice of medical institution. There was an interaction between individual social capital and self-reported physical health on residents' choice of medical institution (OR=1.872, 95% CI: 1.180-2.969, P<0.05). Conclusion: Interventions in terms of social capital factors should be considered in order to promote the rational use of medical resources.

Magneto-optic microscope for visually detecting subsurface defects.

A visual test method for detecting microdefects under fine surfaces is described. A new MO microscope that has a laser source, a CCD camera, and an exciting coil is developed for this work. A pulse generator supplies an intermittent square pulse to the exciting coil, which can intensify eddy currents yet reduce the working temperature of the exciting coil and sample. The magnetic field variation produced by the imbedded defect causes a rotation of the polarization plane of the reflected beam. Therefore the reflected beam carries an image of the defect, which is received by a CCD camera. The optical arrangement guarantees that no light is reflected back to the laser. The system was tested with a calibrator, which has an artificial subsurface defect; such a test attains a visual detected image. To our knowledge this is the first time an image of a subsurface defect has been distinctly detected with a MO sensor system.

[Chronomodulated chemotherapy of oxaliplatin, 5-fluorouracil and folinic acid for advanced gastric cancer].

OBJECTIVE: The combination of oxaliplatin (L-OHP), 5-fluorouracil (5-Fu) and folinic acid (FA), being one of the effective regimens for advanced gastric cancer, is used in form of chronomodulated chemotherapy for advanced gastric cancer to investigate its efficacy and safety. METHODS: Twenty-six patients received a 4-day chronomodulated infusion of L-OHP, 5-Fu and FA. L-OHP (25 mg.m(-2).d(-1)) infused from 10:00 am to 22:00 pm, and followed by 5-Fu (600 mg.m(-2).d(-1)) and FA (300 mg.m(-2).d(-1)) from 22:00 pm to 10:00 am for 4 days using a multichannel programmable pump, every 2 weeks as an cycle for at least 2 cycles. RESULTS: Twenty-six patients with previously untreated advanced gastric cancer were eligible. Two complete and 13 partial remissions were observed with an overall response rate of 57.7%. Stable disease was observed in 6 patients (23.1%) and progressive disease in five (19.2%). Four of these patients underwent surgery. The median remission time was 3.5 months and time to tumor progression (TTP) was 4.5 months. The median overall survival time was 8 months. A total of 80 cycles were given without any grade 4 toxicity observed, but grade 3 thrombocytopenia (1.3%) and mucositis (1.3%) in one patient, two grade 3 neutropenia (2.5%) and nausea/vomiting (2.5%) in 2. CONCLUSION: Chronomodulated intravenous chemotherapy of oxaliplatin, 5-fluorouracil and folinic acid is effective and safe in the treatment of advanced gastric cancer.

Precision ranger for measuring large mechanical components.

We present a precision laser ranger system for the measurement of large manufactured components and structures. The system was developed based on a beat-wave interferometry principle. The light source of this system is a frequency-stabilized laser with a frequency stability of 1 x 10(-7) (in open air) or 10(-8) (in the laboratory). The laser operates in two longitudinal modes, and the two modes are generated in common resonator; therefore the two beams are naturally coaxial. The precision ranger system does not need a long guide or any heavy machinery. In this system an adaptive filter and a wavelet-transform program are used to improve the measurement accuracy. The system described here has a measuring range of 0-20 m and a measuring uncertainty of 30 microm/10 m.

Laser profiling system for on-line measurement of superfine surfaces.

A profiling system for on-line and noncontact measurement of superfine surfaces is described. The system uses the principle of a differential interferometer with coaxial interference arms. The measuring head (optical part) of this system is separable and can be installed on machine tools or in existing measuring instruments. It has excellent resistance to vibration and air turbulence; therefore it needs no damper or cover. This system scans sample surfaces to measure a microprofile with a vertical resolution of 0.08 nm rms.