Papers by Keyword: Regeneration

Abstract: Several cements are used as biomaterials. Biopolymers such as chitosan and collagen exhibit excellent biocompatibility and can be used in the remodeling of bone tissue. The cement must have high mechanical strength and compatibility with original tissue. In this context, the objective of this study was to extract, characterize and cross-link collagen from bovine tendon, forlater associate it with chitosan and calcium phosphate to obtain cements for bone regeneration. Glutaraldehyde was used as cross-linker in 0.1, 0.5, 1.0 and 10% concentration. Infrared analysis confirmed the presence of functional groups characteristic of collagen, whereas the capacity of water absorption decreased with the increasing of cross-linking degree. Denaturation temperatures of collagen samples were obtained by Differential Scanning Calorimetry and Scanning Electron Microscopy showed the fiber structure characteristics of collagen, which were more organized for high degree of cross-linking samples.

Abstract: To investigate the influence of a kind of acetylene black colloidal solution (ABCs) on the regeneration of inactivation PbO₂/PbSO₄ electrode, the simulation deactivation PbO₂/PbSO₄ electrode was prepared by which PbCO₃ acted with H₂SO₄ to produce PbSO₄ and PbSO₄ was in situ electro-oxidized to PbO₂. The cyclic voltammetry and scanning electron microscope had been used to test the electrochemical performance and observe surface topography respectively. The experimental results show that the electrical conductivity of PbSO₄ and PbO₂ particles may be enhanced because of the adsorption of ABC particles on PbSO₄/H₂SO₄ and PbO₂/H₂SO₄ interface. Its adsorption behaviors can control the size of PbSO₄ particles. In the process of the anode reactivation, PbO₂/PbSO₄ electrode process polarization can be reduced. The electrode REDOX current and capacity are improved in H₂SO₄ with ABCs. ABC colloidal particles can be conducive to the structure improvement of the simulation deactivation PbO₂/PbSO₄ electrode. Its electrochemical performance can be reactivated.

Abstract: This paper developed a high efficiency, simple to use and reliable, strong practicability of model 6120 diesel particulate filter regeneration control pulse inverse blow system. The pulse counter blowing regeneration test, and post-processing of particles back down to do the further research. The experimental results show that this device can wall honeycomb ceramic filter for filtering and counter blowing regeneration test and research.

Abstract: China is experiencing a rapid economic development and large-scale urban expansion. The mining waste land is becoming an obstacle in that development. This article summarizes the current strategies that China is using to solve this problem and takes the transformation of limestone mines in Dalian City as the example to introduce how did local governments, enterprises, schools and other aspects make many efforts for this. At the same time, the article also tries to give some new solutions from the angle of sustainable urban planning, through the ongoing relating international exchange program (United research method of interdisciplinary and culture).

Abstract: Phosphorus removal by substrates in constructed wetland has been widely accepted as the most important way. However, as the substrates of constructed wetland will be saturated with phosphorus adsorption after the long-term treatment of sewage, the effect of phosphorus removal and adsorption by substrates is limited. To improve phosphorus retention ability of substrates and extend the lifetime of full-scale constructed wetland system, this paper systematically summarized the researches of P-saturated substrates regeneration in constructed wetland. And the concern with future research directions encompasses several major topics were also prospected in this paper.

Abstract: The decision-making and control system of a burner-type diesel particulate filter (DPF) regeneration was designed. Through the online simulation and the application research, it showed that the regeneration system had good response performances on prediction, decision-making, support and control. The DPF regeneration could be rapidly completed in 5-10 minutes and the regeneration efficiency be more than 87%, and the peak temperature and its maximum average grads were in the safe range. The system can realize the efficient, reliable and safe regeneration.

Abstract: The process conditions of making composite particle adsorption material out of hydroxyapatite-chitosan, regeneration method, and how to use composite particle adsorption material to treat industrial sewage containing heavy metals are researched. Experiment consequence shows that when the mass ratio of chitosan to hydroxyapatite is 0.12:1, the concentration of acetic acid is 4%, and liquid-solid ratio is 0.6:1, the granular material will be produced with the best adsorption effect. The dosage of composite particle adsorption material is 0.025 g/mL, the adsorption time is 60 min, and the temperature is 25 °C , removal percentage of Cd²⁺, Pb²⁺ and Zn²⁺ is 99.25%, 75.16% and 79.33% respectively. The isothermal adsorption equation is C_Cd/Q = 1.323C_Cd + 0.1338. Adsorption selective sequence is: Cd²⁺ > Zn²⁺ >Pb²⁺ . When we use 1 mol/L NaCl to regenerate composite particle adsorption material, it still can be employed to deal with sewage with a good effect.

Abstract: In modern society, the development of urbanization process makes the increasing waste concrete and natural aggregate resource increasingly drying up. Recycled concrete research has become the inevitable development of society. This paper briefly introduces the research status of waste concrete recycling, and points out the current waste engineering application research status and existing problems of the concrete utilization. The industrialization of recycled concrete is in accordance with the needs of environmental protection and sustainable development strategy.

Abstract: The single-factorial design of experiments and response surface methodology was applied to optimize ultrasonic-assisted regeneration of coconut shell activated carbon. With the pH values of the solution, solid-liquid ratio, irradiation time chosen as the independent variable and the activated carbon release of antimony as response values, the central composite design method was used to study each of the variables and their interactions on coconut shell activated carbon regeneration. The results of this study showed that: the optimum pH value was 13; solid-liquid ratio was 372 mL·g^-1; irradiation time was 6.7 h. The average content of the release of Sb from the activated carbon was 6233.95 μg·g^-1 under the optimum condition. Regeneration rate of the activated carbon was 84.45%. This demonstrated that the adsorption efficiency of Sb was close in regenerative carbon and the original carbon. The results proved that the ultrasonic-associated coconut shell activated carbon regeneration process was accurate and reliable, and can provide a reference for the regeneration of coconut shell activated carbon which had adsorbed Sb.

Abstract: Waste silk fibers were dissolved in calcium chloride aqueous solution. Effect of calcium chloride concentration on silk solubility was studied. Dialysis method was used to purify the dissolved silk fibroin. The purified silk fibroin was characterized by FTIR and thermoanalysis technique. Results showed that the purified silk fibroin mainly had irregular curly conformation. The glass transition temperature of the regenerated silk fibroin reached 90.6°C-135°C, higher than 78.9°C-135°C before purification. Thermal weight loss temperature by 50% was 490.3°C differing from 429.7°C before purification.