Advanced Materials Research Vols. 962-965

Abstract: During the volcanic gas reservoirs development, stress-sensitivity will result in permeability decline with formation pressure drop, lowering gas production and affecting the whole gas reservoirs development program. On the basis of the stress-sensitivity experiments on volcanic rocks, the characteristic of stress-sensitivity in volcanic reservoirs is analyzed. On this basis, this paper studies the prediction method of gas well productivity in volcanic gas reservoirs with stress-sensitivity, and establishes the mathematical model of constant pressure production in volcanic gas reservoirs. The results show that the permeability of volcanic rocks has an exponential relationship with effective stress. The stronger the stress-sensitivity is, the more the gas well productivity losses under the same conditions. And the reservoir stress-sensitivity will increase the degree of gas well unsteady production decline.

Abstract: The fault segmentation of blank area in the east of Pubei Oilfield is strong, and the distribution of oil and water is complex. In view of this kind of situation, we did sedimentary microfacies research in study area. First, we established isochronous stratigraphic framework of the east of Putaohua oil layer by core and logging data ,we also established six well logging facies models, including main underwater distributary channel,underwater distributary channel,edge of underwater distributary channel,main sand sheet,sand sheet and bay mud between distributary channels;Secondly, we described the sedimentary microfacies of development area, summarized the evolution of sand and sedimentary microfacies characteristics of Putaohua oil layer; Finally, on the basis of the above work, we drew the sedimentary microfacies of study area. The study provides geological basis for the next step of exploration and development in oil field.

Abstract: Geogas geochemistry method is a way to predict concealed ores by collecting and testing metallogenic elements and associated elements in rising underground gases, which is very promising for broad applications. Due to the unawareness of the source of abnormal materials, the validity of the method is consistently under suspicion. By purifying the collector, controlling operating environment, improving the sampling device and sampling methods, the contents of interference elements are greatly reduced in this paper. Through the analyses of captured samples, obtaining of the geochemical characteristics of elements, areas for detailed investigation can be delineated. This study proves the validity of this method and provides basis for further prospecting.

Abstract: Researchers have been exploring and innovative for more than fifty years from the birth of gas geology. Gas geology as a subject of preventing, controlling and using coal mine gas has its own practical significance. According to published literature, this paper summarizes the current research situation of gas geology in recent years, and some perspectives of the developmental trend of this subject are carried out through the present the main research contents.

Abstract: Physical and mechanical properties of 40 kinds of typical wood species in Zhejiang province were studied in this experiment. Density, shrinkage rate, modulus of rupture,bending strength, compression strength, shear strength and hardness were measured and wood species were classified and evaluated by clustering analysis mehtod (CA) combined with membership function (MF) comprehensive evaluation according to these properties. The results showed that the two analysis methods achieved the similar results when screening first class wood which can be conclued that among the 40 kinds of species Quercus fabri, Dalbergia hupeana Cyclobalanopsis glauca, Lithocarpus harlandii and Lagerstroemia indica were the excellent quality. In the mean while the two analysis methods got the similar conclusion that wood properties of Pterocarya stenoptera were the worest as well. In addation, Camptotheca acuminata and Alniphyllum fortune according to CA and Ilex rotunda, and Cyclocarya paliurus according to MF were also the worest qulaity. The study provided powerful references for wood processing, application and directional cultivation of indigenous tree species in Zhejiang.

Abstract: The forestry specialists should be acquainted with modern information technologies and should be able to use modern software tools for solving various problems of forest industry. One of such modern software tools is the program MOTTI, which supports the solving of forest planning tasks at stand-level. The article presents the results of the adaptation of the MOTTI program to the conditions of Republic of Karelia, as well as the experience of its implementation for educational purposes.

Abstract: Environmental-friendly wood-based panels with low resin content were developed by adding a small amount of phenol formaldehyde (PF) resin and water-repellent paraffin to effectively control the release of free formaldehyde and thickness swelling of the boards. This research was designed to investigate the relations between the various manufacturing conditions and product properties, the effects of board desity, resin content and paraffin content on modulus of elasticity, modulus of rupture, internal bond strength and thickness swelling of the boards were demonstrated. Finally we reach a conclusion: under the pressing pressure of 5MPa, pressing temperature 180°C, pressing time 7min, resin content 3% and paraffin content 1.5%, the panel with a density of 0.7 g/cm³ can meet the national standard GB/T 4897.2-2003—for general purpose particleboards used in dry conditions. So it is possible to develop the environmental-friendly wood-based panel with low formaldehyde emission.

Abstract: With the high quality natural forest resources dwindling , since some species of wood with natural colors, such as pumping wood , ebony, rosewood , etc., not only material of high value , but also very expensive wood color . However, these are expensive and precious wood in short supply and will therefore valuable timber and wood stain to meet the market demand is similar . Low-quality hardwood stained only bright color, texture clear , three-dimensional sense of strong, but without losing the characteristics of natural wood , and organize production according to market demand the formation of industrialized products in order to improve the utilization of low-quality wood , decorative building materials to increase the existing varieties purposes. Therefore, the use of poplar simulate the market needed precious wood has important practical significance . In addition, light color white poplar wood , in the natural growth process still exists heartwood and sapwood and sooner or later material defects such as chromatic aberration , especially wood treatment is not promptly will result in discoloration, the direct use of the logs are often unable to meet the requirements of decoration . Therefore . The thicker sheet dyed precious poplar wood color , and then prepared to meet the customer poplar wood timber strength and decorative requirements, improve the added value of the use of wood , particularly after dyeing material available performance has been greatly improved.

Abstract: This paper brings system dynamics into the analysis framework of sustainable development of forest and analyzes the interreaction of two subsystems of this dynamic system. The studies have shown that the price of forest products plays a key role on the existing ecosystem and influence the evolution of forest ecosystem through adjusting the structure of interests of human being.

Abstract: The stages of getting the planting material for laying plantations of the triploid aspen (Populus tremula L.) are illustrated in this work. The source material selected from the genetic fund “The gigantic aspens” is characterized. The peculiarities of using the method of clonal micropropagation when getting the planting material, the usage of a rootstock as a source of donor explants for the introduction into the culture in vitro, the influence of a kind of nutrient media and growth regulators NAA and BAP on the growth and the development of microsprouts. The distinctions in the speed of the growth of the culture in vitro of diploid and triploid clones have been analyzed. The adaptation of the plants-regenerants to the soil-conditions.