Search

After oil and water separation, the produced sewage needs to be treated in a series of ways and injected into the ground if it reaches the discharge standard in oilfields. Sedimentation separation is one of the most important process. In order to study the law of settlement, a set of settlement simulation device was set up, and the raw wastewater was extracted from the oil production plant for settlement experiment, and the relevant data were gathered. Comsol software is used to model and analyse the model. Through comparing the calculation results with the experimental data, the velocity and concentration of liquid-solid two-phase medium change rules are concluded, which lays a foundation for further research on efficient treatment of oilfield sewage.

Objective: This study collected on from all research relating to health education and hypertension in China and, with the aid of meta-analysis tools, assessed the outcomes of such health education. The analysis provides a basis for the further development of health-education programmes for patients with hypertension. Methods: Literature searches were carried out to identify studies that had evaluated the impact of health education on hypertension in China. The time interval searched was from 1 January 1991 to 31 December 2010. We searched the databases of PubMed, CBM, CNKI and VIP. Strict inclusion and exclusion criteria were used to screen the literature. We generated meta-analyses, using Cochrane RevMan 5.0 software, of outcomes of systolic blood pressure (SBP) and diastolic blood pressure (DBP). Results: Fourteen studies met the inclusion criteria. Results show that, after health education for patients with hypertension, SBP and DBP is substantially lowered; the effect was statistically significant (P < 0.001). We extended subgroup analyses of the separate effects on SBP and DBP with respect to follow-up time, intervention site, intervention method and age. Conclusion: This review confirms that health education plays an important role in blood pressure control in hypertensive patients (especially the elderly): short-term follow-up intervention was more effective, and the effects were similar whether intervention was at the hospital or at the community level.

The purpose of this research is to enhance the accuracy of an INDEX-G200 turning center through real-time compensation for the thermal errors. This paper presents the whole process of thermal error testing, temperature variable selecting by grouping approach, thermal error modeling, etc. The analysis results show that the thermal error range for radius direction on the machine is approximately 18 μm larger than expected, the model set by this method is more accurate and robust, and the thermal error is the major error sources for the machine and should be considered seriously by machine builders and users . [ABSTRACT FROM AUTHOR]

The prevalence of helminths in adult dogs was investigated in Hunan Province, the People's Republic of China between June 2006 and December 2007. A total of 438 adult farm dogs slaughtered in local abattoirs from 9 representative administrative regions in Hunan Province were examined for the presence of helminths using a helminthological approach. All collected worms were counted and identified to species according to existing keys and descriptions. A total of 11 helminth species were found in the dogs, and they represented 2 phyla, 3 classes, 6 families and 8 genera. All dogs were infected by more than one helminth species. Clonorchis sinensis (29.4%) was the only trematode species found, Dipylidium caninum (42.3%) was the most common cestode species, and Toxocara canis (45.2%) the most common nematode species. 6 of the 11 dog helminths are also transmissible to humans (i.e., zoonotic), and can cause severe clinical human diseases, posing significant public health threats. The results of the present investigation have implications for the ongoing control of helminth infections in dogs and humans in Hunan Province, China.

In this study the molecular formula and structure of lipid constituents of silver carp and bighead carp in middle reaches of Yangtze River were determined by gas chromatography-mass spectrometry. The position of double bounds was identified by the method of double bounds chemical localization. These carps are proved to contain eicosapantaenoic acid (EPA) and decosahexenoic acid (DHA). The contents of EPA and DHA, which were determined by gas chromatography, in silver carp and bighead carp were approximately the same as in tuna and salmon. The contents of EPA and DHA in 100 g wet sample were 0.187 g, 0.229 g and 0.246 g, 0.325 g respectively, but the cholesterol contents in silver carp and bighead carp were much lower than in tuna and salmon.