Advanced Materials Research Vols. 113-116

Abstract: This study investigated the effects of Fe0 on the cell growth and hydrogen production to Biohydrogenbacterium R3 sp.nov. in the batch test. The hydrogen content, OD600nm, glucose consumption and the concentration of ethanol had the maximum of 47 %, 1.26 g/L, 95 % and 1067.2 mg/L respectively when the concentration of Fe0 was 100 mg/L. However they all dropped with further Fe0 when the concentration of Fe0 exceeded 100 mg/L, the phenomenon of feed back appeared and the feed back concentration of Fe0 was 100 mg/L.

Abstract: Spin dephasing in organic semiconductor was studied based on spin drift-diffusion model in various electric field. It is found that in the ohmic regime, spin dephasing is determined by the voltage bias. With increase of the voltage bias, spin coherence increases. And the increasing voltage bias can enhance the magnitude of the spin dephasing oscillations at a static perpendicular maganetic field. It shows that the current density in total device output can be modulated by an electrostatic field via controlled precession.

Abstract: wood is the most abundant renewable resource and environmentally friendly energy source on the earth, it not only provides industrial raw materials for economic and social sustainable development, meanwhile, the biological process of wood formation which is mainly to sink the excessive carbon dioxide in the atmosphere can also play an active role in reducing “greenhouse effect”, so it is the contributor of green environment and human heath. Therefore, it is of great importance to explore the biosynthesis process and the wood formation mechanism of woods cellulose. This study adopted RT-PCR to clone gene fragments from the total RNA of populus ussuriensis secondary xylem, through sequence analysis, we found that its size was 487bp, which was named as PusC1，by means of blast comparative analysis, we found that the gene sequence similarity of this fragment and Populus trichocarpa cellulose synthase (XM 002305024.1) reached 94%, and its gene sequence similarity with Populus tremuloides PtrCesA1 and Populus tremula × Populus tremuloides xylem specificity cellulose synthase genes (AY573574.1) sequence could also reach 92%. Therefore, it is inferred to be populus ussuriensis xylem specificity cellulose synthase gene fragment. Through sequence similarity, we can also infer that populus ussuriensis has a close genetic relationship with Populus trichocarpa and belongs to cathay poplar species; while Populus tremuloides belongs to white poplar species and has a close genetic relationship with populus ussuriensis.

Abstract: In the process of Electrochemical micromachining (EMM), the machining gap between tool cathode and workpiece anode is the root cause leading to the error, EMM error of Micro-hole array can be divided into duplication error and repeated error. According to the characteristics of EMM, the impact factors of micro-hole array duplication error and repeated error are analyzed. The distribution of electric field strength and scattered erosion are the most important causation resulting in duplication error. There is stray electric-field existing on electrode side, making scattered erosion to workpiece, impacting micro-hole forming processing precision, the extent of scattered erosion becomes serious with processing time growing, that is showed as phenomenon of sharp corner turning round and the phenomenon is observed carefully by experiments. While the accumulation of air bubbles in the processing region leads to the emergence of repeated error. Through theoretical and experimental analysis, measures are taked to improve machining accuracy.

Abstract: The paper purposes is explore the forefront information of a large-scale protein production from alfalfa cells. With five varieties alfalfa, seleted the highest cell medium from callus . and detected the biomass and protein content in cell grows from different nitrogen source and sucrose concentration. Rusult is the highest protein in 12th -18th days of grows. There are different protein content in different nitrogen source (from Fig.2) and in different sucrose concentration range medium(from Fig.3).Conclusion is obtained the protein from alfalfal cells that is possibally.

Abstract: Safety assessment about source of hazardous chemicals is an important element in the safety production management. Its model has been introduced, moreover, a series of factors which can affect inherent hazard and real danger have been analyzed in this essay. A mathematical model can be established and put into practice. Through specific analysis of the realities of the Source of Hazardous chemical, it is easy to find that real danger has to do with many factors: Technology level, equipment level, the degree of the quality of personnel. These factors can offset and control the risk, therefore the real risk has been greatly reduced compared with the inherent risk.

Abstract: A wear tester was developed. MC PA (nylon) filled with MoS2 and PU (polyurethane) were used as the material of the rubber wheel of roller guide shoes. Their wear performances was investigated with the tester. The results show that the wear rate of MC PA increases firstly and then decreases with increasing load, and reverses with increasing velocity. The wear rate of PU decreases firstly and then increases with increasing velocity. In addition, the main wear mechanisms of PU are plough wear and abrasive wear at the low load (200N). At the loads of 200N~500N, the main wear form of MC PA is the adhesive wear. Adhesive wear is the main mechanism of MC PA at the low velocity (3m/s). Due to inner heat accumulation by friction, squama-peering occurs on MC PA surface at the high velocity (8m/s). The dominant wear mechanisms of PU are abrasive wear and fatigue pitting. And the main reason of PU’s failure is the interior heat accumulation caused by friction.

Abstract: This paper aimed to confirm which adhesive is more suitable to glue the PVC wood-plastic composite materials between epoxy adhesive and J-39 acrylic ester adhesive. This paper tested compression shear strength and aging properties of PVC wood-plastic composite materials glued with these two adhesives. The results show that compression shear strength of PVC wood-plastic composite materials glued with epoxy adhesive is higher than with J-39 acrylic adhesives. Meanwhile, the setting time of two adhesives has effect on compression shearing strength. The results of aging properties after boiled and UV light treatment show that bonding properties of PVC wood-plastic composite materials glued with two adhesive were both degraded after aging，but bonding properties glued with epoxy adhesive was better than acrylic ester adhesive.

Abstract: Methane (CH4) a potent greenhouse gas (GHG). Human activities, such as natural gas extraction, natural gas transportation and coal mining, result in emissions of the large amounts of CH4 into the atmosphere. Thus it is necessary to study the reduction of CH4 in these fields. The experiments of hydrates formation of CH4 and coal mine gas were respectively carried out using self-developed experiment apparatuses. The results show that the hydrates of CH4 and coal mine gas are prone to be formed under appropriate conditions. The strong storage stability of natural gas hydrates was approved by the experiments to determine the dissociation heat and the average dissociation rate of hydrates. At the same time, the technology flow for recovery and utilization of coal mine gas was proposed based on gas hydrate technology. The experiment results and the former literatures indicate that the reducing emission of CH4 using gas hydrates is feasible.

Abstract: Using cesium nitrate and strontium nitrate as doping metal ions source, Cs-doped TiO2 and Sr-doped TiO2 photocatalysts were successfully synthesized through the hydrolysis of tetrabutyl titanate by an acid-catalyzed sol-gel method. The photocatalytic activities of these catalysts prepared at 600 °C for 2 h were evaluated by the degradation of methyl orange in aqueous solution under solar light irradiation, and the as-prepared samples with higher photocatalytic efficiency were characterized by means of X-ray diffraction (XRD) and UV-Vis absorption spectroscopy. The XRD patterns indicate that the crystal structure still remains as anatase phase for the doped samples, and the average crystal size of TiO2, 0.1 at% Cs-doped TiO2 and 0.3 at% Sr-doped TiO2 is 21.3, 13.1 and 10.8 nm, respectively. The band gap absorption shows red shift to the visible region for the doped samples from the UV-Vis spectrogram. The results show that the photocatalytic activity of TiO2 nanoparticles doped with Cs+ and Sr2+ exhibits a significant improvement and their degradation efficiencies are more than 30% in comparison with those of TiO2 under the same condition, and the optimal doping concentration is determined to be 0.1 at% and 0.3 at% for Cs+ and Sr2+, respectively.