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Search Results: 1 - 10 of 104126 matches for " 孙文礼 "
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祁连山玉石沟橄榄岩岩浆作用的记录和铬铁矿的成因
胡振兴,刘益,孙文,张国瑞
西北地质 , 2015,
Abstract: 祁连山玉石沟蛇绿岩型铬铁矿是典型的高铬型铬铁矿床.通过对玉石沟铬铁矿和橄榄岩围岩进行原位定距离采样研究表明:全岩高的MgO和低的SiO2含量指示这些蛇纹石化橄榄岩不是简单的部分熔融残余,而是经历了后期的熔体再富集作用.玉石沟近矿橄榄岩尖晶石(Cr#>65)和铬铁矿尖晶石的矿物包裹体化学特征反映矿体和围岩形成于俯冲带上覆岩石圈地幔.距离矿体由近及远,赋矿围岩尖晶石化学成分(Cr#=43.9~77.2,TiO2=0.06%~0.34%)无规律变化.这说明高铬型铬铁矿体成矿所需铬并非来源于围岩,而是与玻安质熔体渗滤有关.尖晶石含水矿物包裹体仅赋存在玉石沟铬铁矿尖晶石与硅酸盐矿物接触部位附近可能揭示了玉石沟铬铁矿体的成因:成矿铬尖晶石在上侵的含水熔体与周围方辉橄榄岩的反应过程中形成聚集.
改进的分层移动IPv6快速切换技术
An Improved Fast Hierarchy Mobile IPv6 Handover Technique
 [PDF]

李渊, 孙文
Hans Journal of Wireless Communications (HJWC) , 2014, DOI: 10.12677/HJWC.2014.41001
Abstract: 在当今的移动网络中,移动节点可以频繁的切换其接入点,传统的移动IPv6切换方案已经不能很好的满足应用需求。为此,国内外研究人员提出了许多改进方案,也取得了一定的成效。本文在研究、比较之前切换方案的基础上提出了一种新的移动IPv6切换方案。仿真结果显示,该移动IPv6切换方案大大的降低了时延。
 In today’s mobile network, the mobile nodes can change their access point very often, so the Mobile IPv6 Handover technique is unable to meet the application requirements. Researchers has proposed many improved schemes, and achieved some success. This paper proposed a new Mobile IPv6 Handover scheme based on the research and comparision with previous schemes. The simulation results show that this scheme can greatly reduce the handover delay.
刺楸根皮中皂甙的化学成分研究
孙文,张登科,沙振方,张恒,张晓丽
药学学报 , 1990,
Abstract: 从刺楸kalopanoxseptemlobus(thunb.)koidz.根皮中,分离到两个皂甙单体。经光谱(ir,nmr,fab-ms)分析和化学方法鉴定为刺楸皂甙a(kalopanaxsaponina,ⅰ)和一新的三萜皂甙,结构为3-o-(a-l-吡喃鼠李糖(1→2)-α-l-吡喃阿拉伯糖)-常春藤皂甙元-28-o-[α-l-吡喃鼠李糖(1→2)-β-d-吡喃葡萄糖(1→6)-β-d-葡萄糖]酯甙,命名为刺楸皂甙c(kalopanaxsaponinc,ⅱ)。
楤木根皮中皂甙化学成分的研究
孙文,张登科,沙振方,张恒,张晓丽
药学学报 , 1991,
Abstract: 楤木根皮中的主要成分是皂甙。将总皂甙以柱层析分离,得到三个化合物(ⅰ~ⅲ),经光谱分析和化学方法证明,ⅰ为楤木皂甙a(aralosidea);ⅱ为银莲花甙(narcissiflorine);ⅲ是3-o-[β-d-吡喃葡萄糖-(1→2)-β-d-吡喃木糖-(1→)2)-α-l-阿拉伯糖]-齐墩果酸。ⅲ为一新皂甙,命名为楤木皂甙d(aralosided)。
协作通信中自适应中继选择和功率控制算法
Adaptive Relay Selection Algorithm in Cooperative Communication
 [PDF]

张玉, 孙文
Hans Journal of Wireless Communications (HJWC) , 2014, DOI: 10.12677/HJWC.2014.41004
Abstract: 本文基于传统协作通信中的对于固定转发协议研究的基础上,针对了动态网络环境中网络拓扑的变化与无线传输的时序特性,提出了自适应中继选择算法和功率分配方案。仿真结果表明,相对于传统固定协作分集而言,本文提出算法进一步提高了性能增益,误比特率显著下降,延长网络寿命。
Based on the traditional cooperative communications’ protocol for fixed forwarding based on the research, according to a dynamic network environment for network topology changes dynamically and wireless transmission timing characteristics, an adaptive transmission relay selection strategy and power allocation method was proposed. Simulation results showed that, compared with traditional fixed cooperative diversity, the proposed adaptive relaying scheme further improved the performance gain, bit error rate dropped significantly, and that the network life was prolonged.
超声波强化铝酸钠结晶工艺
孙文,张扬,马淑花,王月娇,丁健,唐振华,郑诗
过程工程学报 , 2013,
Abstract: 实验考察了超声波强化铝酸钠结晶过程中超声波频率和功率对铝酸钠结晶和晶体形貌的影响,获得了超声波强化铝酸钠溶液结晶的最优工艺条件.结果表明,超声波能显著强化铝酸钠结晶过程,在结晶温度60℃、超声频率45kHz、功率100W的最优工艺条件下,结晶产品为水合铝酸钠,分子式为4NaAlO2×5H2O,晶体随反应条件不同可呈现片状、八面体、无规则等多种形貌.超声波作用使结晶诱导期缩短66%,溶液的电导率提高1.5倍,溶液中SiO2浓度降至5g/L.
差示旋光法对VC含量的测定及分析
Differential Polarimetry Measurement and Analysis of the Content of VC
 [PDF]

孙宝良, 孙文
Journal of Advances in Physical Chemistry (JAPC) , 2012, DOI: 10.12677/JAPC.2012.12003
Abstract:
维生素C的含量测定主要有碘量法、分光光度法、旋光法、高效液相色谱法、薄层扫描法等多种测量方法,其中碘量法测量过程较为繁琐,且不易排除辅料对维生素C复方制剂的干扰[1];而分光光度法、高效液相色谱法、薄层扫描法等对测量仪器要求较高,加大了检测成本[1]。本文应用物理学方法,借助于线性回归理论,利用维生素C在不同pH的溶液中其旋光度有显著差异,并且其差示旋光度和浓度在一定范围内呈线性关系的特点,通过差示旋光法对VC注射液的含量进行测定,同时对实验的有关影响因素进行研究分析。结果表明VC注射液在2.50 mg/ml~12.5 mg/ml范围内浓度与差示旋光度的线性关系良好,得到的相关方程为y = 0.1835x + 0.0113,相关系数r = 0.996。对比其他测量方法,该方法简单可靠,结果合理,从而达到快速、简便、准确的测定VC含量的目的,尤其适用于中小医院相关科室对药物的快速检测。
Determination of vitamin C content of the main iodometry, spectrophotometry, polarimetry, HPLC, TLC scanning method and other methods of measurement, iodometric method for the measurement process is more cumber-some and difficult to exclude excipients vitamin C compound interference; higher spectrophotometry, HPLC, TLC scan-ning method of measuring instruments, and increased testing costs. In this paper, methods of physics, by means of linear regression theory, the use of vitamin C in different pH solution in the optical rotation were significantly different, and the differential characteristics of the optical rotation and a linear relationship between concentration within a certain range, by difference show the polarimetry VC injection of content were measured at the same time to study and analyze the influencing factors of the experiment. The results show that the VC injection in 2.50 mg/ml. To 12.5 mg/ml concentra-tion and differential optical rotation of the linear relationship, the related equation y = 0.1835 x + 0.0113, the correlation coefficient r = 0.996. Compared with other measurement methods, the method is simple and reliable, the result is rea-sonable, so as to achieve fast, simple and accurate determination of the purpose of the VC content, especially for small and medium-sized hospital departments for the rapid detection of drugs.
基于“白色空间”的备份网络不间断通信研究
Research of Connection Continuity of White Space Backup Network
 [PDF]

赵新锋, 孙文
Hans Journal of Wireless Communications (HJWC) , 2014, DOI: 10.12677/HJWC.2014.41002
Abstract: 提出了一种基于广播电视频段的“白色空间”备份网络,它提供更具有可靠性的接入网,比传统的接入网更具优势。仿真实验结果证明相比于传统方案,提出的“白色空间”备份网络,更有助于减小报文传输和交换的时延,对于网络中的对时延敏感的大流量数据交换业务意义重大。在互联网或WAN中断的情况下,“白色空间”备份网络能够有利于大流量数据交换业务的快速处理。
 This paper proposes the white space backup network that operates on TV spectrum to provide a better reliability access network than conventional unlicensed-based access networks. The numerical results of performance evaluation demonstrate that the proposed white space backup network can contribute to less time delay in the delivery of messages or transactions than the time delay of the conventional approach, and this is a crucial benefit to time-critical applications such as heavy traffic. We expect that the deployment of the white space backup networks can assist those heavy traffic applications to achieve a shorter processing time even under a broken Internet or WAN connection.
基于SINR和滞留时间的垂直切换算法研究
Study on a Vertical Handoff Algorithm Based on SINR and Dwell Time
 [PDF]

周钰, 孙文, 陈玛丽
Hans Journal of Wireless Communications (HJWC) , 2014, DOI: 10.12677/HJWC.2014.46013
Abstract:
为了有效地管理和利用异构网络无线资源,为用户提供更高的服务质量,提出了一种基于SINR和滞留时间的垂直切换算法。首先通过香农定理确定SINR和最大数据速率的关系,再利用这个关系得到不同网络中的等效SINR,然后通过移动终端的运动规律对滞留时间进行估算,若终端的SINR在滞留时间内都满足某个网络中的判决条件,则执行切换。仿真结果验证了此算法的可行性和有效性。
In order to effectively manage and utilize wireless resources of heterogeneous network and provide a higher quality of service for the user, a vertical handoff algorithm which based on SINR and dwell time is proposed. First, the relationship between SINR and the maximum achievable data rate can be determined with the help of Shannom’s capacity theorem. And then the SINR can be converted to the equivalent value in the different networks and the dwell time can be estimated from the moving regulation of the mobile terminal. If the SINR meets the conditions in all the dwell time, handoff happened. The feasibility and validity of the algorithm was confirmed by the simulation.
不可逆离散动力系统的抽象ω-极限集
孙文
系统科学与数学 , 1993,
Abstract: R.Bowen 对于紧致度量空间上的可逆离散动力系统(即自同胚的双向迭代列)引入了抽象ω-极限集的概念,并得到了一些有意义的性质.作为推广,本文对紧致度量空间上的由自映射的正向迭代形成的不可逆离散动力系统定义了抽象ω-极限集,随后证明了两个等价条件.这些条件清楚地刻划了这种极限集的动力学意义.本文的主要定理指
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