三亚邮轮旅游市场潜力预测

邮轮旅游是国际旅游业中增长幅度较大的业务之一,三亚的邮轮旅游自凤凰岛国际邮轮码头投入使用以来,发展也步入快车道。通过三次指数平滑法对三亚旅游市场的总游客人数进行预测,并在此基础上结合国际经验中邮轮游客占总游客量的比率,进一步估测三亚邮轮旅游的游客市场规模。预测显示三亚邮轮旅游市场的发展潜力巨大,增长速度较快,为深入推动三亚邮轮旅游市场发展提供了保证。     

理解多元函数连续性的新方法

通过引入多元函数在某一点按某种方式连续的定义,找到了理解多元函数连续性的新方法,能更深刻地体会一元函数与多元函数连续性思想的一致性.     

现代汉语事务语体虚词分布研究

文章对现代汉语事务语体中虚词的分布、规律及原因作了研究。通过统计分析发现虚词中助词使用最多,其次是介词、连词,很少使用语气词。各虚词小类在使用中存在一定的差异性,这种差异性主要取决于事务语体的基本性质、基本特征。     

多元化实践教学模式研究

为进一步完善实践教学体系,培养学生的实践和创新能力,推进实践教学改革,从机电和电子实验课程体系、教学内容、教学手段、考核方式等方面进行了探讨,总结出一套适合高校实践教学模式。     

研究生教育发展规模测算方法研究

研究生招生需要依据客观规律进行。本文从我国历年普通高等学校招生规模、国家预算内教育经费、国内生产总值GDP出发,分别建立不同的研究生招生预测模型,并作了初步的比较与预测,得出了与国内同类研究不一样的结论。     

Two ancient rounds of polyploidy in rice genome

An ancient genome duplication (PPP1) that predates divergence ofthe cereals has recently been recognized. We report here another potentially older large-scale duplication (PPP2) event that predates monocot-dicot divergence in the genome of rice(Oryza saliva L.), as inferred from the age distribution of pairs of duplicate genes based on recent genome data for rice. Our results suggest that paleopolyploidy was widespread and played an important role in the evolution of rice.     

双CPU在控制系统中的应用

从最简单的硬件和软件设计角度分析双CPU在多I／O应用系统中的实施方法，讨论了双CPU系统的可靠性和灵活性。     

局域弯曲液面的光学特性分析

研究了强度均匀分布的平行光束照射局域上（下）弯曲液面时，其反射光场及该反射光场经透镜后的透射光场的分布特点，发现上弯曲液面的反射光场为椭圆形暗场，下弯曲液面的反射光场为星形亮斑。而它们的透射光场恰好类似于对方的反射光场。对这些特点的形成进行了讨论，同时对上弯曲液面的反射光场进行了计算。     

Distribution Regularity of Muzzle Shock-Wave Inside Protective Cover

The injury of gunners caused by muzzle shock-wave has always been a great problem when firing inside the protective cover. The distribution regularity and personnel injury from the muzzle blast-wave were investigated by both test and numerical simulation. Through the inside firing test, the changes of overpressure and noise have been measured at different measuring points in the thin-wall cover structure with different open widths and shallow covering thickness. The distribution regularity of muzzle shock-wave with different firing port widths is calculated by ANSYS/LSDYNA software. The overpressure distribution curves of muzzle shock-wave inside the structure can be obtained by comparing the test results with the numerical results. Then, the influence of open width and shallow covering thickness is proposed to give a reference to the protective design under the condition of the inside firing with the same cannon caliber.     

日本对外直接投资的产业流向启示

日本先保证国内资源、能源的稳定供应,对相关的产业部门进行投资,再从比较优势的行业依次对外进行扩散,使本国的“边际产业”依次向外转移。“日本式”的这种产业流向在当前我国实施QDII制度条件下对外投资的产业选择有着重要的启示。