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Search Results: 1 - 10 of 10862 matches for " 单逖奎 "
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379例胸外伤临床分析
,冷忠军,陈章
第三军医大学学报 , 2007,
Abstract:
论安格斯·麦迪森对前近代中国gdp的估算——基于1600—1840年中国总量经济的分析

清史研究 , 2010,
Abstract: ?本文对麦迪森关于前近代中国gdp的估计数据和方法进行了分析。我们认为,麦迪森的估算总体上看过于简略,在统计技术上也存在诸多不足,且存在明显的自相矛盾之处。麦迪森认为,1500至1820年中国人均gdp折合1990年美元为600美元,我们认为大约高估了50%—90%。对于前近代中国占世界gdp的比重,麦迪森大约高估了三分之一。
不同来源畜禽粪的养分和污染物组成
英杰,章明
中国生态农业学报 , 2012,
Abstract: 畜禽粪中养分和有害物质的状况直接影响其利用价值。本文从浙江省采集了155个代表性畜禽粪样(包括93个猪粪样,31个鸡粪样,18个鸭粪样和13个牛粪样),采用化学分析和光谱分析方法鉴定了其营养物质、重金属元素和抗生素残留含量。结果表明,畜禽粪中Cd、Cr、Hg、Ni和Pb等重金属含量较低,但Cu和Zn含量普遍较高。Cu、Zn和As含量分别在18.56~1788.04mg·kg-1、12.46~10056.68mg·kg-1和0.69~76.43mg·kg-1之间,平均值分别为525.38mg·kg-1、897.14mg·kg-1和10.01mg·kg-1。与我国农用污泥污染物控制的国家标准(GB4284—84)相比,Cu、Zn和As的超标率分别为53.55%、43.87%和0.65%。畜禽粪中四环素、土霉素和金霉素等抗生素的残留含量分别为0~16.75mg·kg-1、0~29.60mg·kg-1和0~11.63mg·kg-1,平均残留含量:土霉素(5.10mg·kg-1)>金霉素(2.17mg·kg-1)>四环素(2.01mg·kg-1)。四环素、土霉素和金霉素的检出率分别为61.29%、72.90%和69.03%。N、P和K等营养元素含量分别在9.80~43.60g·kg-1、7.98~54.30g·kg-1和8.76~35.20g·kg-1之间,平均值分别为23.63g·kg-1、24.81g·kg-1和20.72g·kg-1;P/N在0.40~2.98之间,平均为1.08。规模化养殖场畜禽粪中P、K、Cu、Zn、As和抗生素残留量明显高于农户家庭小规模养殖的畜禽粪。规模化养殖场中,猪粪重金属和抗生素含量高于其他畜禽粪。规模化养殖场畜禽粪中高含量Cu、Zn和抗生素的残留要求畜禽粪应限量施用,或在施用前进行适当前处理。
基于具身认知理论的动作词汇加工对健康人运动皮质兴奋性及脑卒中患者上肢功能的影响
Action verb processing for exciting the motor cortex and promoting the recovery of upper limb function after stroke

张思聪,季相通,王权,沈浩峰,朱逸溪,胡瑞萍,陈巍,,春雷
- , 2017,
Abstract: 目的 探讨基于具身认知理论的动作词汇加工对健康人运动皮质兴奋性及对脑卒中患者偏瘫上肢运动功能的影响。 方法 实验一:利用经颅磁刺激-运动诱发电位(TMS-MEP)检查18例健康志愿者在进行具体动作动词及抽象动词语义理解加工时其大脑运动皮质兴奋性变化。实验二:在常规康复干预基础上,采用自身交叉设计的前后对照方法对8例脑卒中后偏瘫患者进行3周观察。在第1周、第3周要求患者认真观察代表具体动作的动词文字图片,并进行默读、复述和语义理解;第2周要求患者观察代表抽象动词词汇的文字图片,并进行默读、复述和语义理解。每周训练5d,每天训练30min。分别于训练前、训练1周、训练2周、训练3周后采用改良Ashworth量表(MAS)、Fugl-Meyer运动功能量表(FMA)上肢部分、香港版偏瘫上肢功能测试(FTHUE-HK)、简易上肢功能量表(STEF)进行上肢运动功能评定。 结果 TMS-MEP检查显示具体动作动词语义加工较抽象动词语义加工能引起MEP波幅显著增高、潜伏期明显缩短。经3周训练后8例脑卒中患者上肢FMA评分、STEF评分均较治疗前明显改善(P<0.05);与抽象动词加工训练比较,动作动词加工训练能更显著提高患者上肢FMA评分、STEF评分(P<0.05)。训练1周、2周、3周后患者MAS评分均较训练前显著改善(P<0.05)。训练1周后与训练前FTHUE-HK评分差值以及训练3周后与训练2周后评分差值均显著大于训练2周后与训练1周后评分差值。 结论 具体动作动词语义加工较抽象动词语义加工能更显著增强健康志愿者运动皮质兴奋性,具体动作动词加工训练更有利于提高脑卒中偏瘫患者上肢运动功能。
Objective To explore the effect of action verb processing on the excitability of the motor cortex and any effect on the upper limb motor function of stroke survivors. Methods Experiment 1: The motor evoked potential by transcranial magnetic stimulation (TMS-MEP) was measured while 18 healthy subjects were processing concrete action verbs or abstract verbs. Experiment 2: Eight hemiplegic stroke survivors were asked to read silently text describing concrete hand actions, and then repeat and explain the meaning of the action verbs used in the text. This was repeated for 30 minutes per day, 5 days per week for 3 weeks. In the 2nd week the same training was conducted except that the text was about abstract verbs. The modified Ashworth scale (MAS), Fugl-Meyer assessment (FMA), the Hong Kong version of the functional test for a hemiplegic upper extremity (FTHUE-HK) and a simple test for evaluating hand function (STEF) were used to assess upper limb motor function before and after the training each week. Results Experiment 1: Processing the concrete action verbs induced significantly greater MEP than processing the abstract verbs. Experiment 2: The average FMA and STEF ratings improved significantly after the training each week. Training with the concrete action verbs resulted in significantly better FMA and STEF scores than with the abstract verbs. The average MAS score increased significantly week by week. There was significantly more improvement in the average FTHUE-HK rating after the 1st and 3rd week of training than after the 2nd week. Conclusion Action verb processing induces greater motor cortex excitation than abstract verb processing among healthy subjects and better improves the upper limb motor function of stroke survivors
势能界面法(PEBS)暂态稳定分析的综述及展望
傅书
电力系统自动化 , 1998,
Abstract: 概述了采用势能界面法(PEBS)进行暂态稳定分析研究的发展史,该法速度快,可以引入任何复杂模型,没有收敛性问题,但在多机失稳模式下精度较差。指出将几种直接法与时域仿真法相结合,可能是当前实现动态安全分析的发展趋势。
山东招远–平度断裂带二维地震剖面研究及其地质意义
Two-Dimension Seismic Profile Research and Its Geological Significance of Zhaoyuan-Pingdu Fracture Zone in Shandong Province
 [PDF]

李洪, 禚传源, , 王秀东, 田思清
Advances in Geosciences (AG) , 2015, DOI: 10.12677/AG.2015.51002
Abstract:
自从地震勘探技术成为一种常规勘探方法以来,地震勘探技术始终处于不断改进之中。近几年在金属矿深部勘查中,地震勘探技术的应用逐步得到重视和推广,地震数据处理技术的提高使得地震勘探的精度得到很大的提升,其应用范围逐步扩展,与地震测量相结合的多元信息融合成为开展成矿预测、寻找深部隐伏矿的发展方向。本文在研究招平断裂带地质概况的基础上,以通过大尹格庄金矿的招平断裂带为重点,利用二维地震勘探,完成地震资料的采集、处理和解释工作,探索地震勘查对非层序地层区断裂构造带的解译效果。地震剖面较好的揭示了招平断裂带东西两侧及深部地质体结构特征及差异,清晰地的显示了控矿构造线性特征、多期岩浆活动形成的界面以及后期构造活动对控矿构造的影响,为分析区内断裂构造深部特征和活动期次、岩浆侵入界面和期次划分、构建岩浆–构造格架和建立已知金矿的地震物理勘查找矿模型提供了佐证。二维地震在招平断裂带研究效果显示良好,该数据的取得对胶东地区的深部找矿具有重要的指导意义。
The seismic exploration has become an ordinary exploration method since it was founded and seismic exploration techniques have always been continuously developed. The application of seismic exploration techniques for metallic ore exploration is a new and promising technique, and has gained more attentions. The interpretation precision and application degree of seismic explo-ration techniques can be improved by high precision seismic prospecting method and advanced data processing technique. The technique of coupling seismic exploration and seismic surveying is the developing direction of mineralization prediction and geophysics prospecting for concealed deposit. Based on the geological condition research of Zhaoping fault zone, this paper chose a typical part through Dayingezhuang mining area of Zhaoping fault zone as the object, and focused on the 2D seismic prospecting data acquisition, actual seismic data processing and seismic interpretation, and gained a better effect. The available seismic sections with high quality for structure interpretation have been obtained in the study area. Result of tomography reveals the deep-seated structural features, the linear feature of ore-controlling structure and the contact surfaces among different geologic bodies clearly. These researches will facilitate the depth study of the deep structure features, large-scale tectono-magmatic activities, the tectono-magmatic evolutionary history, and will be helpful for the setting of seismic exploration ore-prospecting model. The successful application of 2D seismic prospecting technology is very important for the deep mineral exploration in Jiaodong area.
地理条件对“铁丰18号”大豆生态影响模式的研究
高振福,
地理科学 , 1984,
Abstract: 我国近十年来培育并大面积推广的一个最优良的大豆品种——"铁丰18号"育成于辽宁铁岭。它克服了现有大豆品种适应性差、产量低等缺点,不但在辽宁已成为大豆的主栽品种,而且从1974年以来,经全国各地试种,也都表现增产趋势,表明它具有广泛的适应性、较好的商品性能、较高的经济效益和较强的抗病能力。近几年,有关科研部门系统观察"铁丰18号"大豆在不同栽培条件下的生育表现,为研究"铁丰18号"大豆在不同地理条件下的生态规律提供了丰富资料。本文拟根据这些试验数据,探讨"铁丰18号"大豆在不同地理条件下栽培的生态模式,为"铁丰18号"大豆易地种植提供依据。
基于最小二乘支持向量机的汽轮机故障诊断
,甘霖,赵玲玲
控制与决策 , 2007,
Abstract: 提出一种小波包分析与最小二乘支持向量机相结合的汽轮机故障诊断模型.对故障信号功率谱进行小波分解,简化了故障特征向量的提取.用二次损失函数取代支持向量机中的不敏感损失函数,将不等式约束条件变为等式约束,从而将二次规划问题转变为线性方程组的求解.选用RBF函数作为核函数,并提出对核函数的参数进行动态选取,提高了诊断的准确率.仿真结果表明该模型具有较强的非线性处理和抗干扰能力.
Keggin结构的磷钨钒稀土四元杂多配合物对过氧化氢分解的催化作用
,叶兴凯
分子催化 , 1996,
Abstract: 在磷钨钒稀土四元杂多配合物中,由于V原子的使用,使其对H2O2分解的催化活性显著增加。因配合物中心原子稀土元素不同。催化活性也随之变化,其活化能与三阶稀土离子的电离能有密切关系。动力学曲线为S型。实验证明,在反应过程中有反应活性中间体生成。
?冷槽离子基态热稳定性的研究
?赵红敏,林家
天津大学学报(自然科学与工程技术版) , 2002,
Abstract: 讨论了在激光-离子相互作用下,线形射频槽中离子态随温度的变化规律,得到了在不同激光失调频率下离子激发态随温度的变化曲线,给出了离子执行可靠量子逻辑门运算的临界温度,这个结果同实验中得到的结果定量相符。
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