Applied Mechanics and Materials Vols. 135-136

Abstract: As building material, Granite has been extensively used. It is important to clear the geochemical characteristics of granites. The paper introduce the Late Triassic-Early Jurassic monzogranite, it mainly located in the south of Yichun area, which were intruded by medium grain monzogranite and syenogranite in Late Triassic-Early Jurassic. According to previous information, this granite distributed in Tangwanghe is widely in the south of study region. Rock type is coarse-medium grain porphyritic biotite monzogranite amphibole-bearing, the edge of the granite (Yishan Forest western) with a flow structure (once believed as gneissic structure), which was classified as Late Carboniferous coarse grained porphyritic gneissic monzogranite in 1:25 million regional geological survey. According to the SHRIMP dating from monzogranite gain the age is 201.5±2.9Ma, showing that the granite was formed in Late Triassic-Early Jurassic.

Abstract: In recent years, environmental protection equipment industry has developed rapidly in china, but there are still many problems to be solved. This article discusses the concept and characteristics of environmental protection equipment industry, present situation of environmental protection equipment industry development and factors restrict the development of China's environmental protection equipment industry, in the end, some suggestions will be made for the environmental protection equipment industry.

Abstract: Take the example of the PⅠ3 sublayers of the Twelve-section in the Xing region of the Daqing oilfield, in this paper, to analysis depositional patterns of reservoirs. To make a effectively reasonable development adjustment, correlation methods were raised, which are well-well、plane well net and identical formation cause boundary remotion according to fluvial sedimentology and high resolution sequence stratigraphy new theory, in order to solve the difficult question of sublayers’ unification and correlation in complicated fluvial-delta strata. To distinguishe one subfacies and seven microfacies, and then to establish logging microfacies model. The single sand body of identical formation cause is delibrately depicted. Finally, to establish three reservoir depositional patterns, which are large-scale compound type channel sandbody, medium-sized distributary channel sandbody, small size distributary channel sandbody, respectively.

Abstract: In this paper, we have designed and realized a efficient full-text retrieval system for the basic annotation People's Daily Corpus based on the inverted index technology. According to the characteristics of the basic annotation People’s Daily Corpus data, we have analyzed the methods and strategies of system implementing thoroughly. On the basis of comparing the various schemes, we have put forward to the three levels index structure of Chinese character, word and address set, and given the design approach of each level index dictionary structure. After converting the unstructured People’s Daily corpus into index structured data, we realized the full-text search algorithm correspond to the proposed index structure. Experimental results show that the proposed search algorithm has achieved the target of "ten millions Chinese characters, response in a second", improved the speed of the People's Daily Corpus full-text search.

Abstract: Near earth surface can be seen as viscoelastic medium. It’s important to collect VSP seismic signal in near-surface.This paper proposed plan designed for VSP seismic data acquisition system based on virtual instrument technology. This design applied the characteristic that the virtual instrument technology has strong capability in single processing and more abundant, distinct expression to VSP acquisition system. This design makes the acquisition system simple, expand easily. And it provides a practical and useful testing tool to logging exploration of near surface project.

Abstract: This paper introduces a new frequency synthesizer scheme –Nested-mixer DDS driving PLL frequency synthesizer. It is a dual loop topology. The AUX PLL uses high comparison frequency. The main PLL comparison frequency is high and changed continuously. It overcomes the shortcoming of long switching time which happens in the traditional DDS+PLL. Taking some optimized measures helps to further improve the synthesizer performance. Oversampling is used to reduce DDS output spurious level. Optimizing the circuit layout and structure, using 6 layers PCB, making control and data signal lines as a separate layer, and sandwiching it between analog ground and digital ground plane, minimize the external noise impact on the frequency synthesizer. Finally, a high performance microwave frequency synthesizer with high resolution has been achieved. It has been applied successfully to a military transmitter and a measuring receiver.

Abstract: The present traffic controllers are most run in 2,3 or 4 phase mode at single point intersections, but the transition of different phase modes during traffic controlling is not flexible. In view of this deficiency, a multi-stage traffic signal controller of variable phases was designed and realized. It is equipped with a single chip microcomputer as the core, signal lights driver circuit, real-time clock, keys and LCD display modules etc. By means of physical simulation, the results show that this controller can run reliably according to system parameters and achieve automatic transition of 2, 3 or 4 phase mode in different stages, thus it also is proved that this controller is more flexible and efficient to control traffic flow.

Abstract: This paper presented the design of a novel embedded bio-impedance analyzer based on digital auto-balancing bridge method. The hardware architecture of the system mainly consists of FPGA, ADC, DACs, USB controller and so on. Many DSP algorithms such as direct digital synthesis, digital phase sensitive demodulation, digital modulation and digital filter were implemented in FPGA to realize the auto balancing function of the bridge circuit. Simulation results show that the system has good performance from low frequency up to 10 MHz. For the advantages of cost-efficient and high stability, it is suitable for BIA application.

Abstract: In view of the natural gas leakage monitoring status, a distributed monitoring system is designed based on CAN bus, which is composed of Master Controller, CAN bus, and data acquisition modules, etc. As well as the circuit diagram and the flow chart of software are introduced in detail. The results indicate that the distributed natural gas leakage monitoring system can fulfill the task of gas leakage state display and alarm successfully in laboratory test, by using distributed structure, the system can be easily expended, and it has the character of reliability and flexibility.

Abstract: Methanogens play an important role to carbon cycling, catalyzing the production of methane and carbon dioxide, both potent green house gases, during organic matter degradation in anaerobic environments. Therefore, it is necessary to better understand microorganisms that produce natural gas. Indeed, methanogens are difficult to perform through culture based methods. In addition, the culture independent methods using the 16S rRNA gene also revealed some disadvantages. For these reasons, the culture independent molecular techniques using the specific catabolic genes such as methyl coenzyme M reductase (MCR) were studied. In this study, a primer set which can amplify specific fragments from a wide variety of mcrA gene was designed based on the homologous regions of 100 mcrA genes listed in the GenBank. PCR with the mcrA primers amplified DNA fragments of the expected size from all the six samples which obtained from biogas production reactors. In addition, denaturing gradient gel electrophoresis PCR analysis using our designed primers also revealed the diversity of mcrA gene in each sample. These results revealed that our primers were successfully to detect the mcrA genes and it is also helpful to know the diversity of mcrA genes in methanogen communities.