34 research outputs found
Research on the Developing strategy of Xiamen Quanjiafu Foods Co. Ltd.
摘要 中国速冻食品行业是从上个世纪90年代中期以来飞速发展的“朝阳性”产业,随着经济发展、消费观念改变和技术提升以及中国城市化进程的加快,速冻食品市场必将拥有光明的前景。 近年来速冻食品行业正朝着规模化、品牌化和竞争的有序化方向发展,大企业凭借品牌知名度和技术更新能力日益蚕食着中小企业的高端市场,消费升级和城乡销售终端的超市化,更使中小企业赖以生存的中低档产品市场受到挤压。面对挑战,属于地区性中小企业的厦门全嘉福食品有限公司急需从战略角度考虑未来的发展方向。 本文运用战略管理理论,在内外部环境分析的基础上对全嘉福食品有限公司的发展战略进行研究并提出实施方案。 本文共分四部分:第一部分是...Abstract The quick-frozen food industry in China, which is called “the rising sun” industry, has developed rapidly since the middle of 1990s. Along with the development of Chinese economy, the changes in people’s concept of consumption and promotion in technology, as well as the rapid development in China’s urbanization and super-marketization, the quick-frozen food industry will surely en...学位:工商管理硕士院系专业:管理学院工商管理教育中心(MBA中心)_工商管理硕士(MBA)学号:20041518
中国物理海洋学研究70年:发展历程、学术成就概览
本文概略评述新中国成立70年来物理海洋学各分支研究领域的发展历程和若干学术成就。中国物理海洋学研究起步于海浪、潮汐、近海环流与水团,以及以风暴潮为主的海洋气象灾害的研究。随着国力的增强,研究领域不断拓展,涌现了大量具有广泛影响力的研究成果,其中包括:提出了被国际广泛采用的"普遍风浪谱"和"涌浪谱",发展了第三代海浪数值模式;提出了"准调和分析方法"和"潮汐潮流永久预报"等潮汐潮流的分析和预报方法;发现并命名了"棉兰老潜流",揭示了东海黑潮的多核结构及其多尺度变异机理等,系统描述了太平洋西边界流系;提出了印度尼西亚贯穿流的南海分支(或称南海贯穿流);不断完善了中国近海陆架环流系统,在南海环流、黑潮及其分支、台湾暖流、闽浙沿岸流、黄海冷水团环流、黄海暖流、渤海环流,以及陆架波方面均取得了深刻的认识;从大气桥和海洋桥两个方面对太平洋–印度洋–大西洋洋际相互作用进行了系统的总结;发展了浅海水团的研究方法,基本摸清了中国近海水团的分布和消长特征与机制,在大洋和极地水团分布及运动研究方面也做出了重要贡献;阐明了南海中尺度涡的宏观特征和生成机制,揭示了中尺度涡的三维结构,定量评估了其全球物质与能量输运能力;基本摸清了中国近海海洋锋的空间分布和季节变化特征,提出了地形、正压不稳定和斜压不稳定等锋面动力学机制;构建了"南海内波潜标观测网",实现了对内波生成–演变–消亡全过程机理的系统认识;发展了湍流的剪切不稳定理论,提出了海流"边缘不稳定"的概念,开发了海洋湍流模式,提出了湍流混合参数化的新方法等;在海洋内部混合机制和能量来源方面取得了新的认识,并阐述了混合对海洋深层环流、营养物质输运等过程的影响;研发了全球浪–潮–流耦合模式,推出一系列海洋与气候模式;发展了可同化主要海洋观测数据的海洋数据同化系统和用于ENSO预报的耦合同化系统;建立了达到国际水准的非地转(水槽/水池)和地转(旋转平台)物理模型实验平台;发展了ENSO预报的误差分析方法,建立了海洋和气候系统年代际变化的理论体系,揭示了中深层海洋对全球气候变化的响应;初步建成了中国近海海洋观测网;持续开展南北极调查研究;建立了台风、风暴潮、巨浪和海啸的业务化预报系统,为中国气象减灾提供保障;突破了国外的海洋技术封锁,研发了万米水深的深水水听器和海洋光学特性系列测量仪器;建立了溢油、危险化学品漂移扩散等预测模型,为伴随海洋资源开发所带来的风险事故的应急处理和预警预报提供科学支撑。文中引用的大量学术成果文献(每位第一作者优选不超过3篇)显示,经过70年的发展,中国物理海洋学研究培养了一支实力雄厚的科研队伍,这是最宝贵的成果。这支队伍必将成为中国物理海洋学研究攀登新高峰的主力军
达乌尔黄鼠季节性肥胖与胰腺功能稳态
储脂类冬眠动物在入眠前的育肥阶段大量积累体脂作为越冬的重要能源物质。达乌尔黄鼠(Spermophilus dauricus)在短短2 ~ 3个月的育肥期间体质量增加近1倍,然而该物种快速育肥过程是否引起糖脂代谢的紊乱以及类似于人类肥胖相关的代谢异常尚不清楚。在本研究中,我们检测了育肥不同阶段黄鼠血糖含量、糖耐受情况、血清和非脂肪类器官中甘油三酯和游离脂肪酸含量以及血清中胰岛素和胰高血糖素含量。结果显示,达乌尔黄鼠在育肥期间血糖保持稳定,心脏、肝脏及肾脏等非脂肪类器官中甘油三酯和游离脂肪酸含量无显著性变化。血清中甘油三酯及胰岛素含量无显著性差异,但游离脂肪酸含量显著升高,胰高血糖素含量显著下降。这些结果说明,达乌尔黄鼠在育肥期间并没有产生高血糖、高血脂、脂质异位堆积和胰岛素抵抗等症状。育肥期间胰高血糖素的降低或许是维持其血糖稳定的机制之一。此外,在冬眠之前,黄鼠胰岛面积以及胰岛细胞数目呈现增加趋势,提示育肥期间可能存在胰岛细胞新生,这可能与育肥期间胰岛功能维持有关。达乌尔黄鼠作为储脂类的冬眠动物,具有独特的体脂积累机制,或将为肥胖引起的代谢综合征的治疗提供借鉴
Accuracy Evaluation of Land Use Mapping Using Remote Sensing Techniques in Coastal Zone of China
Land use mapping using remote sensing techniques supplies essential datasets for scientific researches including global climate change, regional sustainable development and so on. The evaluation information on the accuracy of the land use mapping determines the integrity, reliability, usability, controllability and shareability of the land use maps obtained by the applications of remote sensing techniques. In this paper, the methods, processes and results of multiple temporal land use mapping for China's coastal zone using remote sensing techniques were overviewed, and the land use maps in 2010 and 2015 were selected for accuracy evaluation. The validation samples were collected based on Google Earth and the confusion matrices were established for the whole coastal zone and its sub-regions, respectively. Then, the overall accuracy and Kappa coefficient were calculated. Main findings are as follows: (1) Results of land use mapping in 2010 and 2015 using remote sensing techniques achieved high accuracy. For the entire coastal zone in China, the overall accuracy came to 95.15% and 93.98%, with the Kappa coefficients of 0.9357 and 0.9229 in 2010 and 2015, respectively. (2) The accuracy of land use mapping in China's coastal zone exhibited obvious regional differences. The best accuracy was found in the coastal area of Jiangsu province in 2010, and very high accuracy were found in the coastal area of Hebei-Tianjin, Shanghai city, Hainan province and Taiwan province in 2015, while the worst accuracy was found in the coastal area of Fujian province in both 2010 and 2015. (3) The accuracy of land use mapping in China's coastal zone exhibited obvious typological differences. The very high accuracy (both producer precision and user precision) were achieved for farmland, forest, grassland and saltwater wetlands, and the high accuracy for built-up, freshwater wetlands and human made saltwater wetland, while the worst accuracy for unused land. (4) The misclassification between cultivated land and forest land, construction land and grassland is quite significant. Inland water bodies were easily misclassified into cultivated land, forest land and construction land. Artificial salt water wetlands were easily misclassified into cultivated land and construction land, and unused land. It was easy to mistakenly classify the unused land as cultivated land. These are the issues that should be paid more attention during the continuous update of the land use maps in the future. This study provides supports for the dynamic monitoring and scientific researches on coastal land use changes
III-V族化合物半导体材料的高能重离子辐照效应
用高能(500MeV)Ne离子束对GaAs和InP进行了辐照,用MonteCarlo模拟、正电子湮没谱学以及红外光谱研究了辐照产生的缺陷特性.结果表明,在未辐照的样品中存在单空位,经辐照后,可在样品中产生单空位;当剂量较大时,还会形成双空位甚至尺寸较大的空洞.红外光谱测量发现,在辐照后的GaAs样品中有非晶区形成.此外,辐照在样品中还产生了反位缺陷GaAs和InP以及受主杂质ZnIn.对经1014ions/cm2剂量辐照的InP进行了光学实验,在辐照后的InP材料中发现了亚稳态中心.Both GaAs and InP were irradiated by high energy (500 MeV) Ne ions. The Monte Carlo simulation, positron annihilation and IR spectroscopy were used to study the radiation induced defects. The result showed that monovacancies existed in as grown samples, but more monovacancies were introduced, after Ne ions irradiation, and with increasing radiation dose, divacancies were formed, and eventually large voids were observed. The IR measurement for irradiated GaAs samples confirmed the existence of amor...国家自然科学基
