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Search Results: 1 - 10 of 50169 matches for " 马骥 "
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实时车速信息采集与整合方法研究
,裴玉龙
公路交通科技 , 2003,
Abstract: 实时车速是城市智能化的核心基础数据。基于ITS子系统,包括先进的交通管理系统(ATMS)、自动车辆识别(AVI)系统、车载GPS系统和视频采集系统,分析其实时车速信息采集与整合的几种方法;对比分析两种数据采集结构,即完全分布式和分布式;详细讨论数据描述、数据存储以及数据传输问题;提出区域范围内实时车速的采集系统应该与现有ITS子系统相结合,有效利用实时数据资源,对ITS数据采集、处理和分析具有重要的理论意义和应用价值。
钾霞石快速溶胶-凝胶法制备及表征
,鸿文
矿物岩石 , 2006,
Abstract: 使用氨水调节pH值,正硅酸乙酯-硝酸铝-硝酸钾-乙醇溶胶在5~12min内快速形成凝胶,最佳胶凝条件为:H2O/TEOS=25,EtOH/TEOS=4,pH≈9。干凝胶在862℃晶化热处理3h制备得到纳米级钾霞石粉体。合成钾霞石粉体一次粒子粒径约50nm,团聚后的二次粒子粒径5~20μm,平均孔径11.2nm,孔径呈双峰分布,属于中孔材料,可用作催化剂助剂。
道路交通事故道路条件成因分析及预防对策研究
裴玉龙,
中国公路学报 , 2003,
Abstract: ?在沈大高速公路、辽宁省和哈尔滨市大量事故数据分析的基础上,系统研究道路线形中平面、纵断面、横断面和交叉口各项参数的设置问题及其对交通事故的影响,并对其影响关系进行规律性分析.提出高路基与陡坡路基会危及交通安全的观点,这在中国高等级公路上尤其突出而又经常被忽视.
固体高分子电解质(SPE)的合成及应用

化学进展 , 1989,
Abstract:
四川名茶矿质元素含量研究
王云,
食品科学 , 1993,
Abstract: ?分析了四川名茶矿质元素含量及特点。在所分析的18种元素中,四川名茶k、p、s、ca、mg元素含量较高(>150010-6),ba、cr、v、co、se含量较低(<1010-6);与普通绿茶相比,四川名茶含有较高的k、zn、p、na、ni、cu、s、se、co元素,其高幅为0.38%115.65%,而mg、mn、al、ca、ba、v、rb、fe、cr元素则为7.32%46,67%;红岩迎春、永川秀芽和青城雪芽名茶含有较多的矿质元素,雨城云雾、雨前茶则相对较少。
关于中药复方研究方法的探讨
范颖,
中国中医药信息杂志 , 2003,
Abstract:
特发性血小板减少性紫癜中医辨治规律探讨
张林,
中国中医药信息杂志 , 2009,
Abstract:
鸡蛋期现货市场溢出效应与动态关联研究
Study on the spillover effect and dynamic relationship between egg futures market and spot market in China

郑燕,
- , 2018,
Abstract: 为研究鸡蛋期现货市场关系,利用2013年11月-2017年6月国内鸡蛋期现货市场日度价格数据,通过BEKK-GARCH模型和DCC-MGARCH模型深入剖析了我国鸡蛋期现货市场间溢出效应和动态关联性。结果表明,从鸡蛋期现货市场间溢出效应来看,2市场间存在显著的均值溢出效应,相互之间存在较为显著的价格引导关系,且期货市场对现货市场的价格引导关系更为显著,说明当前我国鸡蛋期货市场对现货市场具有较好的价格发现功能;除此之外,鸡蛋期现货市场间还存在显著的双向波动溢出效应;从鸡蛋期现货市场的动态关联性来看,2市场间的相关关系具有明显的时变特征,且整体表现为正相关。
In order to understand the relationship between egg futures market and spot market, the spillover effects and dynamic correlations was analyzed based on the data of the domestic egg market obtained through the BEKK-GARCH model and DCC-MGARCH model. The result showed that there was significant mean spillover effect between the two markets and a significant price guidance relationship. The futures market had more significant price guidance to the spot market. The egg futures market displayed better price discovery function to the spot market. In addition, there was significant two-way volatility spillover effect between egg futures market and spot market. The correlation between two markets displayed obvious time-varying characteristic, and the overall performance was positively correlated.
我国肉鸡产业市场状态转换及产业链价格非对称传导研究——基于MS-VAR模型分析
Research on the State Transition of Broiler Industry and Asymmetric Transmission of Industrial Chain Price——Based on MS-VAR Model

郑燕,
- , 2018,
Abstract: 选取2003年1月至2017年3月的月度价格数据,通过构建包括商品代肉雏鸡价格、活鸡价格和白条鸡价格的MS-VAR模型,实证分析了肉鸡产业市场状态转换特征及产业链价格非对称传递。结果表明:2003年以来,肉鸡产业市场可划分为正常状态和低迷状态;经历了2003-2008年上半年市场状态频繁转换期和2008年下半年以来市场平稳运行期;大部分时间处于正常状态,2008年之前部分月份以及2013年和2017年个别月份处于低迷状态;两个市场状态均具有一定的稳定性,低迷状态平均持续期为5.76个月,正常状态平均持续期为18.92个月;不同市场状态下,价格脉冲响应路径较为一致,但响应程度存在差异,且产业链价格传导具有非对称性。为此,应建立健全肉鸡市场预警机制,完善肉鸡产业疫病防控体系。
This paper analyzed the market status transformation characteristics of broiler industry and the asymmetric transfer of industrial chain prices by constructing MS-VAR model based on price data of broiler industry from January,2003 to March,2017.The results show that the broiler industry market can be divided into normal and depressed state since 2003.The broiler industry market has experienced the frequent transition period from 2003 to the first half of 2008 and the smooth running period since the second half of 2008.The broiler industry has been in the normal state for most of the time.The broiler industry was in the depressed state some months before 2008 as well as some months in 2013 and 2017.Both show certain stability.The average duration of depression state was 5.76 months,and 18.92 months for that of normal state.The price impulse response paths were relatively in agreement,but there were some differences in the degree of response under different market conditions.The price transmission of industrial chain was asymmetric under different market conditions.Therefore,the early warning mechanism of broiler market should be established and perfected,and the prevention and control system of broiler industry disease should be perfected,too.
铅精矿吸湿平衡数学模型研究
Study on Moisture Adsorption Equilibrium Model of Lead Concentrate
 [PDF]

余刚, , 廖舟, 匡至望
Metallurgical Engineering (MEng) , 2014, DOI: 10.12677/MEng.2014.13010
Abstract:
为了探究并建立更加适用于铅精矿贮存运输过程中的吸湿平衡模型,本文基于铅精矿物料在不同温度、相对湿度和粒径条件下进行的吸附空气中水分实验,结合相关性分析探讨了温湿度、粒径条件对平衡吸湿量的影响,结果表明温度和相对湿度与平衡吸湿量的相关度分别达到?0.927和0.932,为决定性因素。进而基于Langmuir等温吸湿模型,引入温度变量,通过理论推导与经验分析两种途径,分别提出了受温度、湿度共同影响的两种修正Langmuir模型。结合两种模型对实验数据的拟合分析与比较,表明在温度为20℃~80℃和相对湿度为45%~95%的实验条件下,基于经验法修正后的Langmuir吸湿平衡模型可以更为准确地描述铅精矿物料吸湿性能,可以在一定程度上计算生产过程中铅精矿物料的平衡吸湿量。
In order to build a more applicative moisture adsorption equilibrium model of lead concentrate, the partial correlation analysis of different factors to moisture adsorption content is conducted basing on the previous experimental works. It shows that the temperature and relative humidity, the correlations are ?0.927 and 0.932 respectively, are decisive factors. And then, based on the original Langmuir equilibrium adsorption model, two modified Langmuir models are built by theoretical and empirical methods, which are controlled by the temperature and relative humidity. The analysis and comparison of two models shows that the empirical modified Langmuir equilibrium model is more applicative to the lead concentrates under the 20?C - 80?C of temperature and 45% - 95% of RH. So, the empirical modified Langmuir equilibrium model can be employed to calculate the moisture adsorption content of lead concentrates in the industry to some extent.
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