Advanced Materials Research Vol. 629

Abstract: The paper mainly focuses on the possibility of realizing the NMR spectroscopy in a non-static external field. The behaviour of magnetic moment under a time-dependent magnetic longitudinal field is much different from that one under a static magnetic longitudinal field, because the magnetic susceptibility is a more complicated complex when both of transverse magnetic field and longitudinal field are time dependent. In this paper, we calculate the magnetic susceptibility of the water and give an analysis of the effect on the magnetic susceptibility in a time dependent longitudinal field and RF frequency.

Abstract: Two-phase immiscible displacement in porous media is described by a coupled nonlinear system of an elliptic equation (for the pressure) and a parabolic equation (for the saturation). For the saturation changes much rapidly than the pressure, a more accurate solution (in both time and space) should be illustrated in practical numerica simulaiton for the former unknown. In this paper we present a seven-point central finite difference scheme to simulate the pressure and a characteristic finite difference combinng with domain decomposition method for the saturation equation. This method consists of reduced two-dimensional computation on the subdomain interface boundaries and fully implicit computation parallelly in subdomains. Aparallel algorithm is outlined and an error estimate in discrete norm is derived by introducing new inner products and norms. At the end of this paper, numerical experiments are presented in order to demonstrate theoretical results and the efficiency.

Abstract: This study aims at dealing with the collaborative pricing and service level joint decision problem for a supply chain with one supplier and one buyer in a multi-period finite horizon. The study derives analytic solutions under wholesale-price-only and consignment agreements for the decentralized supply chain with shortages allowed and completely backlogged. The analysis shows that the consignment agreement can significantly achieve higher channel-wide profit and service level than the wholesale-price-only agreement.

Abstract: This study examines channel performances of business-to-business electronic and traditional marketplaces for newsvendor problems under revenue-sharing contracts. A manufacturer, acting as a leader in the channel, offers a retailer a revenue-sharing contract and wholesale price. The retailer, acting as a follower in the channel, decides the product quantity and retail price. The numerical indicate that the profits of channel, manufacturer and retailer for the vertically decentralized channel in the electronic marketplaces are generally better off than those in the traditional marketplaces.

Abstract: The paper studied the coordination of a three-level supply chain made up of one manufacturer, one distributor and one retailer under the random demand. Firstly, the optimal order quantity is determined with the channel coordination of the supply chain; Secondly, the paper designs a combined contract (rebate-penalty contract & revenue-sharing contract, RP-RS) to coordinate the supply chain, namely, manufacturer offers distributor a rebate-penalty contract and distributor offers retailer a revenue-sharing contract. The paper validates that RP-RS contract can coordinate the three-level supply chain by choosing reasonable parameters. The reasonable choice of parameters can attain the win-win good among all business members, which will help to improve the decision-making capacity and competive ability of businesses involved in the supply chain, and the sizes of parameters in a reasonable range relate to the bargaining position of a business.

Abstract: With the rapid development of economic, substantial increase of production and consumption, the resource is developed and used excessively, which brought a growing deterioration of the environment and ecological problems. Researching and selecting scientific and rational disposal technologies can effectively solve the current municipal solid waste pollution of environment. This paper introduced the municipal solid waste utilization methods used commonly. This paper establishes a solid waste utilization evaluation indices system based on Analytical Hierarchy Process (AHP). Then it discusses the theoretical foundations and application process of AHP and analyzed dependence and feedback among indices.

Abstract: Aimed at the specific geological conditions of 7# thin coal seam in Liuquan Mine, this paper used the methods of numerical calculation and theoretical analysis to determine the reasonable technological parameters of high-grade conventional mining face. The numerical simulation software of UDEC (Universal Distinct Element Code) was used to contrast and analyse the characteristics of surrounding rock stress distribution and overlying rock horizontal displacement under the condition of different length of coalface, then it was indicated that the surrounding rock deformation was less when length of coalface was 110 m which was advantageous for roof control; according to the conditions of roof and floor, the roof support strength was being calculated systematically to determine the row space of props being 700×1200 mm; the main equipments of coalface was assorted, and reasonable work manner in coalface and gob processing measure was put forward, which provided guidance for efficient mining in thin coal seam.

Abstract: Based on the geology and mining technology conditions of III2 coal seam in Xinzhuang Mine, the method of similar material simulation test was adopted to analyze the characteristics of overburden caving and weighting in coalface under ascending mining, and the software of Rock Failure Process Analysis System(RFPA2D) was applied to simulate and analyze the roof control effect under different mining sequence and supporting method, then engineering practice was made in III2-12111 coalface. The results showed: mining the III2 coal seam under ascending mining, the periodical weighting was 6.7 m; compared with the method of four rows single-support in maximum roof control span and three rows single-support in minimum roof control span (shorting for three-four rows roof control method) in coalface, adopting the method of three rows single-support in maximum roof control span and two rows single-support in minimum roof control span (shorting for three-two rows roof control method), gob stowing was tighter, and hanging arch distance was reduced, and roof strata stress reduced by 10~15%; the observed result of mine pressure showed, adopting three-two rows roof control method (row space for 1.2 m, column space for 0.5 m) in coalface, compression of props and roof-to-floor convergence meet the requirements, it ensured the safely and efficiently mining in coalface, and obtained the largest monthly output of 30000 t, average monthly output of 26000 t.

Abstract: Economic benefit or economic efficiency refers to the ratio of input to output, but not the owner’s income. The right evaluation of enterprise benefit or enterprise efficiency should abandon the indicator system, in which the core is the profit margin reflecting investor’s income. The scientific evaluation index system of enterprise benefit or enterprise efficiency should focus on the ratio of net assets value reflecting total puts to total, the ratio of net cost value reflecting resources taken to output, and the ratio of excess net assets value which is comparable. And the supplements are the index that reflects the constitutive social effects, the efficiency of using resources and the benefit of protecting environment, the development index and the qualitative index.

Abstract: The service industry have become vital strength of today’s global economy. The traditional service are almost designed and drived from enterprise. This article firstly brings forward the concept of ‘Reverse Service’, which feature is ‘Customer Pull’, individuation, green low carbon and circulation friendly. The article introduce the meaning of the reverse service from the perspective of customer experience with its core content of the optimization of customer experience, path of reverse service and system optimization, intellectual value added and interface innovation, which objective is implementing cycle use of resource, green environment protection, maintaining service reputation, building up brand image and enterprise sustainable development. Based on this, this article summarize the scientific significance of research from this perspective including particularity, systematic science and green sustainability. Finally, the article gives the summary of the current research status and development trend of the relevant field.