Journal of Theoretical and Applied Sciences

Risk assessment of Ordovician limestone water inrush in No.9 coal seam of Yangdong coal mine and its prevention and control measures

Research Article of Journal of Theoretical and Applied Sciences Risk assessment of Ordovician limestone water inrush in No.9 coal seam of Yangdong coal mine and its prevention and control measures Li Yanheng1,2,3*, Tao Zhen1, Xu Jinfeng1, Man Jianqi1, Ren Chuan1, Li Wenhui1, Zhao Xin1 1College of Earth Science and Engineering, Hebei University of Engineering, Handan 056038,China; 2Key Laboratory of Resource Exploration Research of Hebei Province, Hebei Collaborative Innovation Center of Coal Exploition, Hebei University of Engineering, Handan 056038, China; 3Hydrogeological Bureau of China National Administration of coal geology, Handan 056038, China With the increasing of mining depth, intensity, scale and speed, Ordovician limestone water has become the biggest threat to the safety production of the low group seam. Based on the existing geological data, the hydrogeological characteristics of Ordovician limestone water are analyzed; the risk of Ordovician limestone water inrush is evaluated by using the method of “five maps and double coefficients” and considering the importance of effective protective thickness of floor protective layer in the evaluation results. The results show that there are no non straight through relative safety area (Area I) and non straight type relative risk area (Area II), only non straight type water inrush risk area (Area III) and straight through water inrush risk area (Area IV). According to the evaluation results, the floor grouting reinforcement is directly adopted in Area IV, and the Ordovician limestone may need to be modified in the strong water rich area; in Area III, the grouting transformation of the floor is carried out after the area with water inrush is identified first, but the Ordovician limestone is not needed. Other prevention and control measures should be  subsidiary. Keywords: Water inrush from Ordovician limestone; Risk assessment; “five figures and double coefficients” method; Prevention and control measures ...

Application of AHP-GRA in safety evaluation of blasting flying stones

Research Article of Journal of Theoretical and Applied Sciences Application of AHP-GRA in safety evaluation of blasting flying stones Tianliang Hou GuiZhou University, Mining Institute, GuiYang, GuiZhou 550025 Blasting flying stone is one of the six hazards in rock and soil blasting construction. In order to determine the risk level of blasting flying stone, 3 first-grade indexes such as blasting design and construction are selected, and 11 second-grade indexes such as warning range are not set, so as to establish the blasting flying stone safety evaluation model of AHP-GRA. The analytic hierarchy process (AHP) was used to calculate the weight of the evaluation index. The grey correlation method was used to determine the correlation degree between the blasting flying stone and the safety level of an airport. The risk level of an airport was calculated based on the weight of the evaluation index, and the engineering verification was carried out. The results show that there is no warning signal, no notice before detonation and the warning range is too small, which are the main factors of the flying stone accident. The model presented in this paper is used to evaluate the blasting flying stones in an airport, and the evaluation results are basically consistent with the reality. It can be seen that the evaluation model can scientifically and reasonably evaluate the risk level of blasting flying stones, which has important practical significance. Keywords: Blasting flying stone; Safety evaluation; Analytic hierarchy process; Grey relational degree ...


Review Article of Journal of Theoretical and Applied Sciences JOHN FOWLES’ CONTRIBUTION TO POSTMODERN LITERATURE Sodikova Bakhtigul Ibodullayevna Department of Interfaculty, Termez branch of Tashkent state Pedagogical University named after Nizami , Uzbekistan The term of postmodernism suggests that the period came after modernism (since the 70-90ss of the 20th century). Postmodern texts are marked by the mixture of times, cultures, languages, real facts and fiction, the present and the past. Postmodern literature is presented by such key figures in English literature as John Fowels , Julian Barns, Doris Lessing, A.S. Byatt, Peter Ackroyd, G. Swift, etc. Out of them we have chosen John Fowels’ novels because of his originality, versatility and skill were nowhere more evident than in his most celebrated novels, among them “The Collector,” “The Magus” and “«The French Lieutenant’s Woman».” In “«The French Lieutenant’s Woman»,” for example, he combined the melodrama of a 19th-century Victorian novel with the sensibility of a 20th-century postmodern narrator, offering his readers two alternative endings from which to choose and at one point boldly inserting himself into the book as a character who accompanies the hero on a train to London. His teasing, multilayered fiction explored the tensions between free will and the constraints of society, even as it played with traditional novelistic conventions and challenged readers to find their own interpretations. Keywords: postmodern literature , the Collector , Hero, fiction, autobiographical , nonfiction ...

Determination of Appropriate Seed Rate and Row Spacing of Bread Wheat for Highlands of Guji Zone

Research Article of Journal of Theoretical and Applied Sciences Determination of Appropriate Seed Rate and Row Spacing of Bread Wheat for Highlands of Guji Zone Seyoum Alemu, Yared Tesfaye, Obsa Chimdesa, Kabna Asefa, Girma Teshome Bore Agricultural Research Center Wheat is one of the major staple crops in Ethiopia in terms of both production and consumption. Even though it is such an important cereal crops in Ethiopia, it is giving low yield due to many production constraints such as lack of improved varieties, poor agronomic practice (inappropriate seeding rate and row spacing), diseases, weeds and low soil fertility in Ethiopia in general and in Guji zone in particular. Therefore, field experiment was conducted during the 2015-2017 main cropping season at Bore and Ana sora to assess the effect of seeding rate and row spacing on yield components and yield of bread wheat; and to determine appropriate seeding rates row spacing for bread wheat. The experiment was laid out RCBD in a factorial arrangement with three replications using a wheat variety known as ‘Huluka’ as a test crop. The treatments consisted of four levels of seeding rate (100, 125, 150 and 175 kg ha-1) and four levels of row spacing (15, 20, 25 and 30 cm) consisting a total of 16 treatments. Analysis of the results revealed that all parameters were significantly (P<0.05) affected by the interaction of the factors (seeding rate x row spacing) as well as the main effects except date to 50% heading and plant height which did not significantly (P<0.05) affected. The highest grain yield (4239 kg/ha) were obtained from combination of 150 kg/ha seeding rate and 20cm row spacing. Therefore, use of 150 kg/ha and 20cm row spacing can be recommended for production of bread wheat for the study area (Bore and Ana Sora) and other ...

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Journal of Theoretical and Applied sciences