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In view of the adverse engineering characteristics of saline soil such as collapsibility, salt expansion and corrosion, cement, cement-lime and KD curing agent have been respectively used to modify the saline soil in the coastal areas for engineering application. Unconfined compressive strength test of the modified soil has been conducted to analyze the reasons why the two previous modified materials...
Based on statistical fracture theory, the expect strength and failure probability of brittle materials relating 3-point bending test and 4-point bending test are developed. The relation of the expect strength in the above stress states is studied. According to the analysis results, the followings may be concluded: (1)The expect strength in bending stress states is greater than that in the stress state...
In surfactant flooding, surfactants added are often a mixture of the same type of molecules with different lengths of carbon chains. The relationship between a single, pure surfactant solution and crude oil is seldom studied. Additionally, up to now, alkylbenzene sulfonates are applied widely in surfactant flooding, such as Daqing oilfield, China. A factory producing alkylbenzene sulfonates will enlarge...
The Industrial Ethernet for industrial control area has become an inevitable However,the uncertainty and non-real-time are the major obstacle while Ethernet entering the industrial field equipments. The ages,bottlenecks and corresponding solutions of Industrial Ethernet are analysed in this paper. The improvement methods of non-real-time is emphasized,and the prospects of China's EPA real-time Ethernet...
This paper analyzed the status of networked manufacturing technologies, put forward new networked manufacturing mode based on the integration of ASP and CPC; constructed the overall framework for designing system under new networked manufacturing mode; integrated service and function from CPC based previous ASP networked manufacturing mode with deeply analysis about these service and topology structure,...
The basic structure of the single piston hydraulic free piston engine was introduced. And also the main working modes, such as switch between working modes, rebounding test, reposition of the piston assembly, compression and cushion, were illustrated. This paper paid great emphases on the introduction of the structures of the compression chamber and compression piston. It was indicated that the compression...
Golden alga is an important component of plankton in water ecology. In this study, the grazing characteristics of Poterrioochromonas sp., isolated from Microcystis cultures in 2002, was described. The results showed that this golden alga has size-based prey selectivity. The size of grazed preys was no more than 10 μm. Poterioochromonas sp. was able to ingest single cell, short catenarian or filiform...
A novel broad band-pass filter with pass band of 470MHz and size of 2×1.2×0.5mm3 has been designed combining with low temperature co-fired ceramic (LTCC) technology. A single high frequency ferrite has been used for both inductor and capacitor parts to resolve the co-fired mismatch between the ferrite and ceramic layers in the conventional passive filters working below 1GHz. The S-parameters calculated...
Eight simply supported dry-mixed self-compacting concrete (DSCC) beams and two normal concrete beams were tested and flexural behavior of the tested DSCC beams (including deflection, strain and crack) were studied. The results showed that water ratio and coarse aggregate ratio played important role in deformation performance and bearing capacity of flexural members. Deflection and maximum crack width...
With the severe situation of marine environment and ecology in China, why we are faced with such a severe situation is that all kinds of marine pollution and excessive development of marine resources haven't been controlled effectively. The further reason is that the local governments in coastal area can't adhere to the outlook in scientific development in the course of economic development seriously...
Bio-stability and health security of drinking water have become basic requirements to protect human health. The conventional water purification process, which is composed of coagulation, sedimentation, filtration and disinfection, can not solve the problems of organic matters in the micro-polluted source water effectively. So the by-products generated in the chlorination disinfection increased the...
Taking Landsat5/TM images of 1988, 1997 and 2005, this paper used RS and GIS to analyze the changes of ecological environment effects of land use/cover change (LUCC) during the recent 17 years of the study area. The results indicate that: swamp land shows obvious decreasing trend and decreases 1674km2; dry land and paddy land shows strong increasing trend and increase 377km2 and 1338km2 separately...
Some inherent nonlinear interference factors of iron-core PMLSM are main factors that influence its trajectory tracking performance. In order to improve the tracking precise of linear motor, on the basis of PID controller, two kinds of iterative learning controller based on pulse transfer matrix are proposed. Then the convergence of these two methods is detailed analyzed. Simulation results show that...
The characteristics of jobbing work are analyzed, and a systematic structure for design automation in jobbing work circumstance is present. Based on product module library and frame-structured design knowledge library, new product's scheme pattern configuration and parameters' calculation proceed to fulfill automated design process. Then, making use of the results of primary design, the optimized...
A self-made fretting fatigue tester for steel wire based on the computer-controlled electro-hydraulic servo fatigue testing machine is introduced in the paper. The working principle and experimental method are described. The signals of contact load, fretting tangential force and fretting amplitude are collected using force and displacement sensors. Synchronous acquisition and dynamic display of the...
Eu/SiO2 Nanoparticles was prepared through sol-gel method. The gel was synthesized through the hydrolysis of a complex solution of containing tetramethoxy-silicane (TMOS) and EuCl3·6H2O. X ray diffraction analysis showed that that there are crystalline materials appeared in the amorphous SiO2. The fluorescence spectroscopic analysis showed that the Eu/SiO2 fluorescence peaked at 590 nm with excitation...
Control of steel sheet shape and vibration at the air knives can increase the quality, save zinc and reduce costs. In this paper, an electromagnetic actuator set is designed to evaluate the feasibility of using active magnetic levitation technology to control vibration of the steel sheet. Vibration control model is built and incomplete derivative PID controller with series lead compensation is used...
In alloy bar rolling by Round-Oval pass sequence, the critical point on the contact boundary is solved and the cross-section profile parameter of outgoing workpiece is represented, then the equivalent height of outgoing workpiece and mean roll radius at the exit section is derived to correct the spread formula. Based on the initial spread calculated by the modified Shinokura and Takai spread formula,...
Permafrost area in china is about 2.15×106km2, and mainly distributed in Tibetan Plateau, Northeast china and Midwest mountains. Although engineering construction increased gradually in permafrost regions with the development of society and science technology, there was no precedent for the airport construction in permafrost regions two years ago. Mo-he airport, the first airport in permafrost region...
Our research focused on the Characteristics of HPAM degradation, using 11 hydrolyzed polyacrylamide degrading bacteria strains that were gained from Daqing field. In this study, we demonstrated that the degradation capability of the mixed strains was stronger than each single one. In addition, Infrared spectrum analysis and Gas Chromatography analysis on HPAM degradation products showed that, parts...
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