Guo Aihong

Electrodialysis Production of Hypophosphorous Acid

It is a method of preparing hypophosphorous acid with electrodialysis. It comprises an insoluble anode, an insoluble cathode and an aqueous solution of hypophosphite anions. The direct current, through the insoluble anode to cathode in electrical contact with the aqueous solution to generate H+, forms hypophosphorous acid solution. In the paper, we study the best term of different factors about the experiment. The process is simple, low cost and high efficient, It is a cleaner production without waste residue and waste water.

The change of Tangshan Nanhu city Wetland Landscape based on multi-level classification method

Base on RS and GIS, 1993, 2000, 2007 and 2009 TM images of Tangshan Nanhu Wetland are taken as the data source, Landscape characteristics and change are studied. The knowledge discovery and feature extraction on the basis of traditional classification method of the remote sensing pictures are discussed. Multi-level classification method is used in monitoring of Tangshan Nanhu Wetland area land cover. This method is superior to the classifying device of single routine. In this paper, Tangshan Nanhu Wetland Landscape change is obtained by using multi-level classification method dealing with Tangshan Nanhu Wetland region remote sensing images. The study shows that with the rapid economic development and urbanization, great changes of land use have taken place in Nanhu Wetland area during 1993–2009.

Notice of Retraction Simulation heat transmission mechanism of insulation material by finite element method

Finite element method is mainly applied in continuous mechanics, thermal conducting, electromagnetism field and so on. Its basic thought is that consider district as limited and conterminous units with certain rule, then combine system square and solve it. The fly ash-foam heat insulating material is a kind of inorganic -organic compound, containing more micron and sub-micron class pore structure and a great deal of hollow tiny bead. The mechanism of heat transmission is very complicated. Therefore, finding the mechanism of heat transmission will contribute to understanding the material how to keep temperature. It is instructive to enhance the performance of the material. In this paper, the thermal module of Finite element analysis is used to simulate the course of heat transmission of the fly ash-foam material. It shows that the result of simulation and measured value are accordant.

Notice of Retraction Undergraduate Research Experiences of Hebei Polytechnic University

The problem existing in higher education at present is analyzed in this paper, which is the main reason about the low level of undergraduate scientific research ability. Combining the undergraduate scientific research experience of Hebei Polytechnic University, some methods are put forward on undergraduate scientific research ability train in university. The investigation shows that introducing undergraduate into scientific research gradually is right and accepted by students and teachers.

Study on Treating Stench Wastewater Containing Dodecyl Mercaptan by Electrolyzing Sodium Sulfate Solution

This paper suggests a technological process to oxidize stench sulfide wastewater containing dodecyl mercaptan with electrolyzing Na2SO4 in the presence of active carbon. Preliminary experiments were conducted and good results were obtained. Under the condition that electrolyzing 1%(m/V)Na2SO4 with 1A current and the reaction temperature remains 30 and the reaction time lasts 10 ~ 30 s, the stench dodecyl mercaptan was eliminated.

Notice of Retraction Water environmental restoration and management of Tanghai wetland nature protection area

Tanghai wetland and bird nature protection area is a provincial level nature protection area. As a result of global climate change, the average temperature of Tanghai wetland has increased in the past 30 years. The change in temperature influences the water cycle directly. In this paper, the changing on Tanghai wetland water environment is explained from the temperature, precipitation, evaporation, water supply, water consumption and so on. In order to protect the wetland water environment, the method of restoration and management is provided.

Preparation and Characterization of Al-pillared Montmorillonites

Al-pillared montmorillonites (Al-MMT) were synthesized from natural occurring sodium montmorillonite through the exchange of inter-lamellar ions with hydroxyalumina polycations. Furthermore, the morphology, composite structure and pore properties of such composite materials were investigated by Powder X-ray Diffraction (XRD), Fourier Transformation Infra-red Spectra (FTIR) and Nitrogen Adsorption-Desorption Isotherms The products retain their layered structure and their pore structures are a slit-shaped pore between plate-like particles. The resultant products possess BJH pore volume as large as 0.18cm3g-1, high BET specific surface area of over 100m2g-1, narrow pore size distribution in the mesopore region 7-7.5nm after thermal treatment at 500 ºC.

Study on Coagulation Pretreatment of Laboratory Wastewater

The wastewater discharged from laboratories does harm to the environment, and there is no mature treatment method of it. According to the characteristics of laboratory wastewater , the coagulation treatment of the laboratory wastewater using inorganic polymer flocculants, such as PAC and PFS, was studied in this paper. The coagulation factors also studied include the optimum dosages of these flocculants, the pH value , the settling time and the different wastewater quality. The following research results were obtained: (1) PAC was the most appropriate flocculant in coagulation treatment of laboratory wastewater. (2) It can obtain the best effect when the dosage of PAC was 80 mg/l, pH was 5 and the settling time was 30 min.On this condition, the removal rate of turbidity was more than 95%,and the removal rate of COD was more than 40%. (3) Coagulation treatment can be a unit of laboratory wastewater processing , having a good pretreatment effect, Lay good foundation for the follow-up processing.