oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

2019 ( 178 )

2018 ( 3385 )

2017 ( 3689 )

2016 ( 3786 )

Custom range...

Search Results: 1 - 10 of 163844 matches for " 周玉梅 "
All listed articles are free for downloading (OA Articles)
Page 1 /163844
Display every page Item
金属Pd催化一步法合成聚乙烯胺
One-Step Synthesis of Polyvinylamine by Using Pd-Catalyst
 [PDF]

,, 冯乙巳
Studies in Synthetic Chemistry (SSC) , 2013, DOI: 10.12677/SSC.2013.12003
Abstract:

聚乙烯胺(简称PVAm)是含有胺基的多功能聚合物,其功能胺基使得聚乙烯胺能进行一系列的氨基特征反应。在本论文研究中,以金属化合物Pd(OAc)2作为催化剂催化聚氯乙烯(PVC)在氨气条件下一步法胺化生成聚乙烯胺;生成的产物聚乙烯胺通过红外和核磁共振法来进行结构检测,并用电导滴定法来测定聚乙烯胺的胺化度。试验结果表明,在40℃温度时,聚氯乙烯与氨气可在Pd(OAc)2催化下反应4.5h即可得到46.5%的产率和78.5%的胺化度。
Polyvinylamine (PVAm) is a kind of attractive multi-purpose polymer with amino groups which provide a series of exceptional potential reactivities. In this work, metallic compound Pd(OAc)2 catalyzed the synthesis of polyvinylamine by one-step method, with PVC as raw material and NH3 as aminating agent. Structure of the target product PVAm·HCl was characterized by FT-IR and NMR and amination degree of polyvinylamine was determined by electro- conductivity titration. The yield and amination degree of the product over

基于数据驱动的贵州水资源智能配置研究
Study on Water Resources Intellectual Allocation in Guizhou on Account of Data Drive
 [PDF]

晓明,, 王伟, 王葵
Modeling and Simulation (MOS) , 2016, DOI: 10.12677/MOS.2016.54015
Abstract: 随着经济的快速发展和人口的急剧增加,水资源危机日益严重。现阶段研究贵州偏远山区水资源的是否能够满足当地人们的需求以及是否合理利用显得尤为重要。本文主要基于数据驱动研究贵州山区水资源,建立最大可支撑人口模型和GM(1,1)灰色预测模型,研究当前贵州省的水资源承载力以及预测未来该地区的水资源承载力,进而得出贵州省的水资源总量相当丰富。丰富的水资源要得以合理优化的配置,进而建立基于AHP的模糊综合评价模型对贵州省水资源智能优化配置做出合理的评价方案。
With the rapid development of the economy and the dramatic growth of population, the intensifying crisis of water resource has raised common concern. In the current stage, it is extremely important to make researches on whether the water resource in Guizhou’s remote mountain areas is capable of satisfying local demands and whether it is rational utilized. This thesis studies the water resource in Guizhou Province mainly on account of data drive; in accordance with the largest supporting population model and GM(1,1) Grey Forecasting Model, it studies the current water resource capacity of Guizhou Province, and predicts the future water resource capacity of the area, thus drawing a conclusion that water resource in Guizhou is of abundant total volume. As for the allocation that optimizes the abundant water resource, however, it is shown in the researches that the water resource in Guizhou Province is of rather low utilization efficiency and poor mobilization capability. On this basis, a fuzzy synthetic evaluation model is set up based on AHP so as to provide a reasonable evaluation plan of intelligently optimized allocation of water resource in Guizhou Province.
清开灵静滴治疗急性中毒50例
王伟,,
中国中医药信息杂志 , 1999,
Abstract: 促苏醒、迅速改善全身中毒症状是抢救急性中毒患者的重要措施。笔者近3年来,在常规治疗方法的基础上,加用清开灵注射液静滴治疗急性中毒50例,取得了较满意的效果,现报告如下。
开放式小区对道路通行能力的影响
The Influence of the Residential Area’s Openness to Road Passage
 [PDF]

刘松琴,,, 吴倩
Modeling and Simulation (MOS) , 2016, DOI: 10.12677/MOS.2016.54020
Abstract: 本文主要以优化城市空间资源、提高路网通行能力和协调各主干道与支干道车辆流通作为出发点,通过系统动力学构建路网设置、交叉路口和上下班高峰期等影响因素作为评价体系,并使用分布模拟开放后小区各主干道与支干道车流量,通过对小区开放前后车辆通行能力和车辆滞留数进行对比,得到小区开放后减缓了周边道路通行的压力。
The article is mainly to take the rational allocation of urban space, to optimize the urban space resources, to improve the road network traffic capacity and to coordinate each main road and the road vehicle flowing as a starting point. It is the evaluation system that is through the system dynamics building road network settings, intersection, traffic lights, and the rush hour and so on. And then using Poisson distribution imitates the case that each main traffic road and the branches of roads are flowing in some places after opening. It can be concluded that the stress of traffic around the roads is decreased by comparing the traffic capacity and the number of stranded vehicles.
机器翻译还是人工翻译?——浅析《黄帝内经·素问》双字格养生术语机译错误人工评测
Human assessments of machine translation errors intranslating two-word life-nurturing terms in Huangdi’sInternal Classic ? Plain Questions: machine translation orhuman translation?

屈亚媛,
- , 2016,
Abstract: 限定语言内机读术语库的创建与维护是机器翻译系统开发的一个重要组成部分。能否借助机器翻译技术有效、快速、准确地翻译中医养生术语是我国传统中医养生概念顺利传播到世界的关键步骤。本文以《黄帝内经·素问》养生篇章中双字格术语为基础,对SYSTRAN机器译文和我国中医英语专家李照国的译文进行平行对比研究,人工评测了SYSTRAN系统机译限定语言内术语的表现,描述、分析了机译双字格中医养生术语翻译错误的形式和原因。本研究旨在通过人工评测改进机读养生术语词典,进一步优化中医养生术语机译数据库。
Building and maintenance of the machine-readable dictionary in a limited register plays a great role indeveloping the machine translation system. The theory of health preservation in traditional Chinese medicine (TCM)would be transmitted to the world successfully by machine translation unless the machine can translate life-nurturing termsefficiently and effectively. Based on the two-word life-nurturing terms in Huangdi’s Internal Classic ? Plain Questions, ourstudy compares the translations produced by SYSTRAN and Professor Li Zhaoguo, classifies the errors and analyzes thereasons through human assessments in the register, aiming at improving the quality of the machine-readable dictionary inthe register and optimizing the database of the health preservation terms in TCM
于混合信号片上系统的低相位噪声锁相环设计
矫逸书,,蒋见花,吴斌
半导体学报 , 2010,
Abstract: This paper describes the design of a fully integrated low phase noise CMOS phase-locked loop for mixed-signal SoCs with a wide range of operating frequencies. The design proposes a multi-regulator PLL architecture, in which every noise-sensitive block from the PLL top level is biased from a dedicated linear or shunt regulator, reducing the parasitic noise and spur coupling between different PLL building blocks. Supply-induced VCO frequency sensitivity of the PLL is less than 0.07%-fvco/1%-VDD. The design is fabricated in 0.13 μ m 1.5/3.3 V CMOS technology. The in-band phase noise of –102 dBc/Hz at 1 MHz offset with a spur of less than –45 dBc is measured from 1.25 GHz carrier. The measured RMS jitter of the proposed PLL is 1.72 ps at a 1.25 GHz operating frequency. The total power consumption is 19 mW, and its active area is 0.19 mm2.
杨树水泡型溃疡病的病原菌鉴定
,花晓,赵经
微生物学报 , 1979,
Abstract: 从杨树水泡型溃疡病斑上分离出真菌,在室内和自然情况下作接种试验,终于接种成功,产生与自然瘸斑相同的典型症状。此真菌经鉴定有性阶段为Botryosphaeria dothidea,其子座直径为2--7毫米;子囊腔大小为116.4—175.0×107.0—165.0微米;子囊大小为49.0—68.0x11.0一21.3微米;子囊孢子单孢,无色,倒卵形,大小为15.0—19.4×7.0一11.0微米。无性阶段为Dothiorella gregaria,其分生孢子器暗色,球形,大小为97—233.0×97—184.3微米;分生孢子单孢,无色、梭形,大小为19.4—29.1x5.0—7.0微米。用杨树水泡型溃疡病病赶上分离出的多种细菌,经多次在杨树上接种,均未成功。细菌经初步鉴定为欧氏杆菌(Erwinia)、和假单胞杆菌(Pseudomonas)属,经烟草叶片过敏反应测定,不产生桔斑,也不诱发烟草的坏死,因此认为此二种细菌为杨树水泡型病斑上的腐生菌。
Mixed-integrator-based bi-quad cell for designing a continuous time filter
用于设计连续时间滤波器的基于混合积分器的双二阶单元

Chen Yong,Zhou Yumei,
陈勇
,

半导体学报 , 2010,
Abstract: A new mixed-integrator-based bi-quad cell is proposed.An alternative synthesis mechanism of complex poles is proposed compared with source-follower-based bi-quad cells which is designed applying the positive feedback technique.Using the negative feedback technique to combine different integrators,the proposed bi-quad cell synthesizes complex poles for designing a continuous time filter.It exhibits various advantages including compact topology,high gain,no parasitic pole,no CMFB circuit,and high capability.T...
Research of an adaptive sorted K-best detector for MIMO-OFDM system
MIMO-OFDM系统自适应排序K-best检测器研究

朱勇旭,吴斌,,石殊
重庆邮电大学学报(自然科学版) , 2011,
Abstract: 针对IEEE 802.11n MIMO-OFDM系统提出一种基于相干带宽估计的自适应排序K-best检测器(adaptive sorted K-best detector,ASKbest)。通过皮尔逊相关系数(Pearson correlation coefficient)对相干带宽进行估计,据此将频带有效子载波划分为多个子带,对子带内子载波实施相同排序K-best检测。该改进可逼近基于每个子载波排序的全排序K-best检测性能,同时能根据信道相干带宽估计量自适应调整子载波排序次数。20 MHz带宽(56个有效子载波)和4×4天线配置条件下,相比全排序K-best 56次排序,在TGn单径平坦衰落信道A下,ASK-best自适应调整排序次数为1,14径多经衰落信道C下,ASK-best不超过8次排序就可达到全排序K-best性能。
中华稻蝗脂肪提取方法
郭崇友,,孟祥
应用昆虫学报 , 2007,
Abstract: 以丙酮和石油醚的混合液为提取液,通过正交试验,对中华稻蝗oxyachinensis(thunberg)成虫体脂肪进行溶剂提取条件的优化研究,并分别讨论了各因素对中华稻蝗成虫体脂肪提取率的影响。结果表明:料液比4/25、溶剂混比1/1(丙酮:石油醚)、提取时间8h、水浴温度85℃为中
Page 1 /163844
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.