Mechanical Analysis of Herbaceous Plant Strengthening Slope

Since there are the root systems of herbaceous plant in the shallow layer of soil masses of slope, the shallow layer of slope becomes a compound materials made of soil masses and root system.Owing to friction action and tensile resistance action of roots, the shear strength of soil layer with root system is increased.And a comprehensive mechanical analysis of how herbaceous plants strengthen slope was carried out.Not only a mechanical model of interaction between root and soil, but also a quantitative calculation of increase of shear strength and stability coefficient of slope was put forward.As a result, the theoretical basis of herbaceous plant ecological slope protection was provided.     

Transportation and Transformation of Pollutants in a New Type Constructed Wetland

A three stage series operational pilot scale constructed wetland was built for domestic wastewater treatment with inflow of 4.5 m3/d .The mass balance method was adopted to quantify the transportation and transformation of pollutants in constructed wetland during steady state operation.It was shown that the average removal rate of CODcr was 87.14%, in which 68.45% contributed by dissimilation and 18.69% contributed by assimilation.The average removal rate of TN was 60.21% and the contributions of denitrification and microbial assimilation or plant assimilation were 53.64%, 5.39% and 1.18%, respectively.The average removal rate of TP was 59.36% and the contributions of substrates absorption and microbial assimilation or plant assimilation were 43.55%, 12.26% and 3.55%,respectively.In conclusion, microorganisms played a key role in the removal of pollutants and substrates adsorption was the main approach to phosphorus removal.     

Power supply and electromagnetic simulation of implantable medical devices

It is studied how to charge the battery of the implanted medical device through the skin according to its bio electrical characteristics.Energy delivery model of volume conduction is created by FEMlab 3.3 (Finite Element Model Lab),using AC voltage as the input.In simulation,the frequency characteristic of the model is tested,and then 4 different shapes of electrodes are designed.Taking cylindrical electrode for example,the shape and layout of electrode are optimized by changing the electrodes’ cross section areas and the distance between the electrodes.According to the simulation results,current transmitting efficiency can reach above 30% under the premise of ensuring human security.     

Effects of simulated acid rain on the release of Al3+ in typical soils from Three Gorges Reservoir region

The releasing pattern of Al3+ in different horizons in four types of typical soils, which samples were collected from the Three Gorges Reservoir Region, is studied by simulated acid rain leaching of soil columns equipment indoor. The results indicate that the buffering capacity of the tested soils against acid rain is weakened after a long time of leaching, and acid rain of a lower pH presents a stronger impact on the acidification of the soil. The leaching amount of Al3+ in four types of typical soils increases with the decline of acid rain pH value. The leaching quantities are low while the pH value is equal or greater than 3.50 levels, but increase remarkably while the pH is 2.50. Meantime, leaching of simulated acid rain changes the concentration of exchangeable Al3+ in soil (except for red brown purplish soil). These changes are more remarkable in soils with the pH decrease of simulated acid rain.     

Adsorption and corrosion inhibition behavior of mild steel by one derivative of triazole-phenylamide in acid solution

A new triazole-phenylamide derivative (DOT) is synthesized and its inhibiting action on the corrosion of mild steel in 1 mol/L HCl solution is investigated by means of potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) and weight loss measurements. Thermodynamic and kinetic parameters are calculated and discussed. Then the surface morphology is studied by scanning electron microscopy (SEM). Results show that DOT strongly inhibits the corrosion of Q235. The inhibition efficiency of 0.001 mol·L-1 DOT is more than 96%. Polarization curves indicate that the DOT acts as a mixed-type inhibitor, the cathodic and anodic processes of corrosion are suppressed. Thermodynamic and kinetic parameters are obtained from weight loss of the different experimental temperatures, which suggests that at different temperatures (298~333 K) the adsorption of DOT on metal surface obey Langmuir adsorption isotherm model. The adsorption processes are exothermic reaction and belong to chemisorption and physisorption.     

Influence on new tunnel mechanics behaviorinduced by construction about adjacent spacing

This paper takes Chongqing Two-River Tunnel as the research background, based on the system for structure and surrounding rockmass of the highway tunnel, conducts a three-dimension model test about forked tunnel with different altitude to study new tunnel’s mechanics behavior induced by construction, and uses numerical simulation to analyze model domain. The results show that the displacement on new tunnel’s left hance is larger than the displacement on its right hance. Left hance displacement is larger than hance displacement of the single tunnel, and the right hance displacement is less than hance displacement of the single tunnel. The trend of hance displacement and crown settlement with different adjacent spacing is got. Normalizing hance displacement and crown settlement of model test, the relation between displacement and adjacent spacing is disclosed. The hance displacement and crown settlement gained by numerical simulation is close to the converted result of model test, which indicates that the model test data is consistent with the result of numerical simulation.     

A Constitutive Model for Structured Clays based onTwo Different Types of Overconsolidation

Structure has a major influence on the stress strain relation of soil, which implies that the constitutive model should reflect the its structure. Based on the investigation , the over consolidation (OC) of the soils was made up of two different types, which were structure induced OC and stress induced OC. And then the structure induced OC and stress induced OC were united. Structure induced OC index was used to represent the degree of structure and the cam clay model was extended. The shape of the yield surface was the same as cam clay model, whise the size was equal to the sum of the structure induced OC and stress induced OC. And the change in size of the yield surface was decerminated by the volume harden function and the structural damage function. The associated flow rule was adopted in the model. Afterwards constitutive model for structured clays was presented. The concept of the model is clear and the parameters are simple. The ability of the model is good by firstly application and it can describe the character of the structured soils.     

Testing Method and Heat insulating Principle of the Thermal Insulation Coatings for External Wall

Abstract：In the modern society due to the increasingly high requirements on the environment circumstances, it is imperative to study the insulation coating.This paper introduces the testing method and heat insulating principle of the building external wal     

Study on the Seebeck Effect in Steel-slag Concrete

The Seebeck effect of steel slag reinforced concrete was studied in this paper.The effect of steel slag content and curing period on Seebeck effect were focused on especially.The experimental results show that Seebeck effect of steel slag reinforced concrete was discovered,and a good linear relationship was observed between thermoelectric force(TEP)and temperature differential on the specimen;The linear relationship was from enhancing to weakening with increasing steel slag content;As the curing period extends,the Seebeck effect of steel slag reinforced concrete was better,and TEP became steady.