An Analytical study on the Marketing Strategies of Rural Mobile Communication of Gansu Mobile Company

经过近几年的迅猛发展，甘肃省城市地区移动通信市场已经进入了市场成熟期，市场增长势头趋于稳定，进一步扩大市场难度加大。而广阔的农村市场发展相对缓慢，占甘肃总人口68.41%的农村，移动电话普及率仅为20.17%，远远低于城市的60.98%，市场发展潜力巨大。国家西部大开发战略的推进以及全面建设小康社会的深入，极大地推动了甘肃农村社会、经济的发展和农民收入的提高，为农村移动通信的发展提供了较好的经济环境，给甘肃移动公司的发展带来了良好的机遇。面对甘肃移动通信市场越演越烈的竞争，城市客户增长、收入份额提升难度加大与农村市场巨大的发展潜力，甘肃移动公司应加大农村市场拓展力度，提高市场占有率。 论文总...In the past few years the mobile communication market of urban areas in Gansu Province has rapidly developed into a mature market with stable growth and relatively slow expansion. While, the rural area, accounting for 68.41% of the total population of the province, but a low 20.17 % handset penetration rate, a number which is far below urban area’s 60.98 %, has great market potential. Today, the i...学位：管理学硕士院系专业：管理学院高级经理教育中心（EMBA项目）_企业管理(含财务管理、市场营销、人力资源管理)学号：X20031500

ADCP检定水池物理尺寸探讨

为满足当前ADCP计量检定的迫切需求,根据ADCP在水池拖车试验检定时,换能器发射声波的主瓣、旁瓣与检定水池池壁、池底形成的几何关系,推导出了抑制旁瓣、不抑制旁瓣时检定水池的尺寸需求。以市场占有率最高的ADCP产品为研究对象,计算得出了不同工作频率ADCP对检定水池宽度和深度的理论值。导出的公式,进一步完善了ADCP计量检定的理论基础,为ADCP在室内可控环境下的检定规范制定及检定平台设施建设提供参考与借鉴。国家自然科学基金(41775027);国家自然科学基金青年科学基金(41405025

Germany's Accounting Environment and Accounting Model: the Enlightenment to China's Accounting Reform

随着全球经济一体化和会计国际化的发展 ,国际会计问题成为各国关注的焦点。欧盟是中国的主要贸易伙伴 ,而德国又是欧盟的主要成员 ,德国特有的市场经济体制与民族文化环境 ,形成了独特的会计模式。研究和借鉴德国会计发展中的可取之处 ,有利于我国会计的国际化进程 ,也对我国会计变革有所启示With the development of economic globalization and accounting internationalization, international accounting has become a major concern of various countries. As a chief member of EU, which is an important trade partner of China, Germany has a unique model of accounting, stemming from her unique market economy system and national culture setting. Making good study and use of the German experience in the development of the accounting system will benefit the internationalization process of China's accounting, and bring inspiration to China's accounting reform

英美会计职业判断的比较与启示

随着现代会计职业和职业团体的诞生与发展,会计职业判断愈来愈为西方国家会计理论界和实务界人士所关注,我国新准则的颁布与实施,由于其数量倍增,体系庞大,而且所要求的会计处理方法越来越复杂,会计职业判断独具魅力。因此,研究会计职业判断具有一定的现实意义

AERODYNAMIC MOMENTS CONTROL OF WING MODEL USING PLASMA JET

为考察火花放电等离子体射流控制机翼气动力矩的效果,在NACA0021平直机翼模型上安装火花放电等离子体射流发生器,通过改变射流发生器安装位置、射流角度及加载电参数,研究其控制机翼模型气动力矩的性能及机理。在NACA0021机翼模型近前缘处,布置2个火花放电等离子体射流发生器,采用气动力测量技术,在来流风速为20 m/s时测得,攻角-4°~10°时,滚转力矩系数最大减小了0.0024,攻角为12°~16°时,滚转力矩系数最大增加了0.0021;偏航力矩系数最大减小了0.00097。实验研究结果表明:等离子体射流可改变机翼模型横航向气动力矩,并可通过改变射流角度和加载电压频率调节等离子体射流控制横向气动力矩的效果。To investigate the control effect of Spark Discharge Plasma Jets(SPJs) on the aerodynamic moments of a wing, SPJ generators were used for active flow control experimental study on an NACA0021 straight wing model. The location of SPJ generators along the chord of the airfoil, the jet flow direction relative to the chord, and the driving voltage parameters were changed to research the control effect and mechanism of SPJ generators on the aerodynamic moments of a wing model. The aerodynamic moments were measured with a six-component balance at a wind speed of 20 m/s. Two SPJ generators, arranged near the leading edge, reduced the rolling moment coefficient by a maximum of 0.0024 for angles of attack-4°~10°, but increased the rolling moment coefficient by a maximum of 0.0021 for angles of attack 12°~16°. The yaw moment coefficient was reduced by a maximum of 0.00097. The results show that aerodynamic moments control of wings can be realized using SPJs. The control effect of SPJs on the aerodynamic moments is changeable by adjusting the driving voltage frequency and the jet flow direction relative to the chord.航空科学基金项目(20141368007);; 福建省自然科学基金项目(2010J01014

浆细胞样树突状细胞在宿主抵御隐球菌肺部感染中的作用及机制研究进展

肺隐球菌病是由隐球菌感染引起的常见真菌病,由于症状的非特异性,临床上诊断较为困难。作为条件致病性真菌感染,肺隐球菌病的结局主要与宿主免疫力有关。目前肺隐球菌病免疫学发病机制研究主要局限在T细胞和巨噬细胞。近年研究表明,作为树突状细胞亚群之一的浆细胞样树突细胞,由于其激活后可以产生大量的I型干扰素并活化相关的T细胞,所以在机体抵抗病毒和细菌免疫中发挥着重要的作用。但是浆细胞样树突细胞在真菌病,尤其是在隐球菌病的发生发展中发挥的作用尚不明确。本文将介绍肺隐球菌病的临床表现、诊治及T细胞和巨噬细胞在肺隐球菌病中的免疫机制,并通过介绍肺隐球菌病和浆细胞样树突细胞及二者之间已有报道的联系,初步阐述浆细胞样树突细胞在肺隐球菌病免疫学发病机制中的相关作用。国家自然科学基金(31770161);;上海市科学技术委员会基金(14DZ2272900);;国家卫生部基金(2018ZX10101003);;上海市科委技术标准专项(16DZ0500401)~

基于FBG传感技术的复合材料加筋板低速冲击损伤监测

针对碳纤维增强树脂基复合材料低速冲击损伤的实时监测,本文设计将布拉格光纤光栅(FBG)传感器埋植在复合材料加筋板结构的三角填充区,在线监测复合材料T型加筋板冲击损伤过程。分别将FBG传感器埋植于复合材料层合板内部和复合材料T型加筋板的三角填充区,对比FBG传感器的埋入对复合材料层合板与复合材料T型加筋板对力学性能的影响,结果表明内埋FBG传感器的复合材料层合板试样的拉伸强度比未埋植传感器的层合板试样降低了约5%,但在FBG传感器的破坏应变范围内,FBG传感器可以准确、实时地监测复合材料的应变信号。将FBG传感器埋入复合材料T型加筋板的三角填充区,内埋FBG传感器的加筋板样件压缩破坏载荷与未埋植的样件基本一致。通过对比加筋板蒙皮上冲击位置、冲击能量对FBG传感器测得的冲击过程持续时间和最大应变值的影响,表明冲击过程持续时间随着冲击能量增加而延长,最大应变值随着冲击距离的增加呈下降趋势,而最大应变值随着冲击能量的增加呈上升趋势。利用FBG传感器测得的应变信号可初步实现对复合材料T型加筋板蒙皮冲击损伤位置及冲击能量的实时监测。国家重点研发计划(2016YFD0700603);;航空科学基金(2016ZF68011);;江苏省重点研发计划(BE2015007);;福建省科技创新平台建设计划(2014H2006

Reviews on Ecosystem Services Valuation and GIS-Based Mapping

生态系统服务价值评估是当前生态经济学领域的研究热点,为解决生态系统对人类的重要性提供了量化参考。文章论述了国内外生态系统服务价值的评估方法,分别从静态评估、动态评估和gIS技术应用三大方面进行了归纳分析,提出今后应重点关注生态系统服务价值的时空动态模型开发、评价指标体系与评价方法的标准化制订和生态系统综合管理与应用等方面的研究。Ecosystem services valuation has become one of the hotspots in the field of ecological economics,and provides quantitative evidence concerning the importance of the ecosystem for human-beings.In this paper,we first discussed ESV method in static,dynamic and GIS based respectively.We pointed out that scientific community should focus on several topics in the near future to deepen the understanding of the values of ecosystems.These topics include the development of spatially and temporarily explicit dynamic valuation models,standardization of valuation methods and payment for ES and meeting the requirements of regional ecosystem management and decision making.北京市科学技术委员会“永定河生态修复目标体系研究”(D090409004009003);北京市生态学重点学科项

Calculation of passive earth pressures on retaining wall considering soil arching effects of backfill clayey soil

为解释挡土墙后填土被动土压力的非线性分布现象,在考虑土拱形状为圆弧,滑裂面采用朗肯滑裂面的基础上,给出考虑土拱效应的被动土压力系数kAWn,进而基于应力状态法及土楔形体静力平衡两种思想求解了竖向平均应力V？公式,在该基础上,给出黏性土填料下的挡土墙被动土压力分布公式、合力公式及作用点高度计算公式。通过与试验与其他方法对比,文中提出的方法得到验证。最后,研究了黏性土填料下的挡土墙被动土压力变化规律,即考虑土拱效应求得的黏性土填料的被动土压力分布呈现上小下大的指数型分布。此外,随着δ/φ(δ为墙土摩擦角,φ为内摩擦角)的增大,土拱效应逐渐增强,土压力合力点逐渐降低。The nonlinear phenomenon which the passive earth pressure behind the retaining wall of both sand and cohesive soil is nonlinear distribution could be explained by the soil arching effect theory.The formula which calculated passive earth pressure coefficient of which assumed the stress state method and the soil wedge static equilibrium method were derived considering the soil arching effect, assumed arch as circle and the angle of slip surface as Rankine's theory.Then, the distribution of lateral earth pressure considering the soil arching was derived by the above formulations; also the formulas that calculating the magnitude and the point of application of lateral passive earth pressure were derived.The accuracy of proposed method is confirmed by comparing with the experimental tests and values from existing equations.Finally, the trends of distribution and the height of total passive earth pressure of clayey soil are studied; distribution of passive earth pressures considering the soil arching is likely an exponential curve; and the height of resultant earth pressure point is gradually reducing with increasing the ratio of soil-wall friction angle to internal angle δ/φ.国家自然科学基金资助(No.51209180); 浙江省自然科学基金资助(No.Y1091175