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Search Results: 1 - 10 of 8461 matches for " 焦学军 "
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新疆西天山1:50万化探成果评估与异常查证对策
刘宽厚,庄道泽,学军
地质与勘探 , 2003,
Abstract: 在中高山、深切割区开展1:50万甚低密度化探具有控制能力强、生产效率高的特点,所圈定的异常、异常带是进一步矿产预查的主要目标。在分析西天山地区1:50万化探工作方法技术和成果的基础上,从大量的1:10万、1:5万化探异常查证项目中挑选3个典型案例,对1:5万、1:10万化探与1:50万化探对异常反映能力进行了对比分析,认为1:5万或1:10万化探应沿异常带、控矿构造带、矿化分布带所构成的成矿带进行系统部署并提出了西天山地区相应的工作方法。
新疆包古图斑岩铜矿伴生元素金和银赋存状态初步研究
宋会侠,郭国林,学军,刘玉琳
矿物岩石 , 2007,
Abstract: 新疆西准噶尔包古图斑岩铜矿床Au平均含量0.25g/t,Ag为2.56g/t,Cu为0.30%,属于富金斑岩铜矿。伴生金和银矿化作用有两期:早期为斑岩矿化,形成了Cu-Mo-Au矿化组合,是主矿化期;后期叠加了Cu-Au-Ag-Te-Bi矿化,规模不大,出露于矿床的局部部位,但对矿石起到了加富作用。通过对钻孔薄片和光薄片的镜下观察及电子探针成分分析,认为早期矿化中Au和Ag主要呈固溶体形式存在于硫化物中,分布比较均匀,基本上不出现独立矿物,Au含量明显高于Ag;晚期矿化形成了复杂的Cu-Au-Ag-Te-Bi矿物,矿石呈浸染状和脉状叠加在早期矿化之上,以银矿物为主,与多种碲铋类矿物共生,主要银矿物有碲银矿、铋-碲银矿(?)、银-辉碲铋矿(?)、银-硫铋铜矿、银金矿等。晚期矿化规模不大,但对于提高矿床的经济价值具有重要意义。
几个小麦亲本主要农艺性状的配合力评价及遗传力分析
卢超,高明博,小钟,何峰,学军,王辉
麦类作物学报 , 2010, DOI: 10.7606/j.issn.1009-1041.2010.06.007
Abstract: 为了解小麦品种(系)主要性状的配合力,为杂交育种选择优良亲本和最优杂交组合提供依据,选用西农979、郑366、西农9871、周麦18等表现优良的小麦品种(系)为材料,采用Griffing不完全双列杂交法,配制了35个杂交组合,对小麦亲本及杂种F1的旗叶面积、穗粒数、千粒重、穗下节长、穗颈长5个性状进行了田间考察,并在基因型方差分析显著的基础上进行了配合力方差分析、配合力效应的估计及遗传力分析。结果表明,周麦18和许农5号是综合性状优良的亲本,其多数性状的一般配合力均较大。陕麦94和周麦18千粒重的一般配合力比较突出,是提高千粒重的理想亲本。结合特殊配合力效应值分析,组合(郑366×郑9694)、(西农9871×周麦18)、[02(6)9510×04中36]、[02(6)9510×浚997]、(郑366×许农5号)、[02(6)9510×郑9694]可作为高产育种的重点组合,在品种选育中应加以重视。遗传力分析表明,旗叶面积、穗下节长、穗颈长、千粒重4个性状的广义遗传力较大,但狭义遗传力均偏小,低于50%,说明加性遗传效应较小,显性效应和上位性效应较大,应该适当推迟选择的世代(F5~F6)。
阿尔泰山南缘克朗盆地泥盆纪火山沉积与矿产
学军,马忠美,郭旭吉,张连昌
西北地质 , 2005,
Abstract: 新疆阿尔泰山南缘克朗晚古生代火山-沉积盆地盆地,位于西伯利亚板块南缘泥盆纪陆缘裂谷带中,在早泥盆世发生了大规模多期次的火山活动,在康布铁堡组火山沉积地层中形成了恰夏、铁木尔特和阿巴宫多个VMS型铜铅锌铁多金属矿床;中泥盆世火山作用减弱,在阿勒泰镇组沉积地层中形成SEDEX型红墩铅锌矿床。
黄河断流对三角洲生态环境的影响与缓解对策的研究
田家怡,王民,窦洪云,学军,玉木
生态学杂志 , 1997,
Abstract: ?
7个烤烟产量相关性状的QTL定位分析
童治军,芳婵,学军,吴兴富,方敦煌,肖炳光
- , 2018,
Abstract: 以烤烟Y3和K326为亲本,采用单粒传法(SSD)获得一个包含262个F6株系的重组自交系群体(RILs)。基于该群体构建了一张含有24个连锁群、626个SSR标记,总长为1 120.45 cM的遗传图谱。通过两年一点3次重复的随机区组田间试验,测定了株高、节距、叶数、茎围、茎叶角度、腰叶长和腰叶宽7个与产量相关农艺性状,采用混合线性模型的严格复合区间作图法(rMQM)在烟草全基因组范围内进行QTL扫描分析。结果显示:(1)烤烟7个目标性状在RILs群体内各株系间存在较大范围的连续变异,具有显著的双向超亲分离,且各性状的平均值很接近中亲值; 7个农艺性状的平均广义遗传率为73.33%,其中株高和节距的广义遗传率在80%以上,而茎围和茎叶角度的广义遗传率则低于60%,表明7个与烤烟产量相关的农艺性状是既受微效多基因控制又受环境条件影响的数量性状。(2)共检测到30个QTLs分布在9条连锁群上,其中与株高、节距、叶数、腰叶长和腰叶宽相关的5个主效QTLs在连续两年中均可检测到,且具有较大的效应值,可解释大于10%的表型变异。(3)7个目标性状之间存在一定程度的相关性,与之对应在基因组中也存在一些较小区域,每个区域包含2个或2个以上紧密连锁的不同性状的QTLs。烟草产量相关农艺性状的QTL分析和主效QTLs的获得,为进一步利用分子标记辅助选择培育烟草高产新品种奠定了理论基础。
语义匹配性及刺激间隔对视听双模态脑控字符输入系统的影响
Effects of Semantic Congruency and Stimulus-Onset Asynchrony on Audiovisual Bimodal Stimuli Based BCI Speller

安兴伟+,曹勇+,綦宏志,学军,明东
- , 2018, DOI: 10.11784/tdxbz201702038
Abstract: 近年来, 基于事件相关电位(ERP)的脑控字符输入系统的研究越来越多, 视觉与听觉的多模态刺激范式作为一种新型的复合刺激越来越受到关注.然而, 研究视听双模态刺激的脑控字符输入系统性能因素的文章却很少报道.本研究旨在初步探究视听觉刺激的语义匹配性以及刺激间隔(SOA)对视听双模态脑控字符输入系统的影响.为此, 本研究设计了语义匹配、语义失配两种刺激范式, 每种范式又设置两种不同的刺激间隔(200 ms或400 ms).10名健康被试参与了本实验, 通过对比事件相关电位特征、可分性及分类正确率发现视听觉匹配性、刺激间隔以及两者交互作用对非目标刺激大脑反应、目标刺激大脑反应及其可分性都有显著性影响, 且视听觉的匹配性对视听联合脑控字符输入系统分类正确率影响显著, 但是不同刺激间隔脑机接口分类正确率之间并无显著性差异.本研究的结果能够为基于双模态刺激脑控字符输入系统的范式选择和优化提供一定的指导意见.
In recent years,researches on event-related potential(ERP)-based brain computer interface(BCI)speller have become increasingly popular. Visual and auditory based multimodal stimuli paradigms as new paradigms have attracted more and more attention. Studies on the effect of experimental parameters on system performance of visual-auditory stimuli based BCI speller have rarely been reported. This study aims at investigating the effects of audiovisual semantic congruency and stimulus-onset asynchrony(SOA)on audiovisual bimodal stimuli based BCI speller. Therefore,two audiovisual paradigms(semantic congruent and semantic incongruent)with two different SOAs(200 ms and 400 ms)were adopted,and 10 healthy subjects participated in the experiment. ERP,discrimination of targets and non-targets,and classification accuracy were analyzed. Results indicated that semantic congruency,SOA and the interaction factors have significant effect on the brain response and discrimination of target and non-target stimuli. Semantic congruency also has significant effect on system classification accuracy,whereas no significant difference was found on factor SOA. This study could provide a theoretical guidance for the design of new paradigms on visual and auditory based bimodal BCI speller
基于脉搏波的警觉度检测研究
Research on vigilance detection based on pulse wave

曹勇,学军,潘津津,姜劲,傅嘉豪,徐凤刚,杨涵钧
- , 2017, DOI: 10.7507/1001-5515.201704071
Abstract: 本文采用脉搏波信号研究了警觉度的变化规律。本研究共招募 10 名受试者参加了持续 95 min 的警觉度“时钟测试”(MCT)。试验过程中,受试者们通过卡罗林斯卡嗜睡量表(KSS)和斯坦福嗜睡量表(SSS)主观评价了清醒程度,同时记录了所有受试者的目标反应时间、目标识别正确率和脉搏波信号。结果表明,根据主观量表得分和受试者的行为学数据可以将警觉度定标为 3 个水平:前 30 min 为高警觉度水平;中间 30 min 为一般警觉度水平,后 30 min 为低警觉度水平。此外,脉搏波信号的时域特征,如:次级波峰幅值、波峰幅值、次级波峰潜伏期,随警觉度的降低而减小,而波谷幅值随警觉度的降低而增大;频域特征:8.600~9.375 Hz、11.720~12.500 Hz、38.280~39.060 Hz 和 39.060~39.840 Hz 这 4 个子频带的能量概率也随警觉度的降低而减小。最后,在上述 8 个特征建立的模型中,10 名受试者三分类正确率的平均值高达 88.7%。本文的研究结果证实了脉搏波在警觉度评估上的可行性,为警觉度的实时监测提供了新的思路。
This paper studied the rule for the change of vigilance based on pulse wave. 10 participants were recruited in a 95-minute Mackworth clock test (MCT) experiment. During the experiment, the vigilance of all participants were evaluated by Karolinska sleepiness scale (KSS) and Stanford sleepiness scale (SSS), and behavior data (the reaction time and the accuracy of target) and pulse wave signal of the participants were recorded simultaneously. The result indicated that vigilance of the participants can be divided into 3 classes: the first 30 minutes for high vigilance level, the middle 30 minutes for general vigilance level, and the last 30 minutes for low vigilance level. Besides, time domain features such as amplitude of secondary peak, amplitude of peak and the latency of secondary peak decreased with the decrease of vigilance, while the amplitude of troughs increased. In terms of frequency domain features, the energy of 4 frequency band including 8.600 ~ 9.375 Hz, 11.720 ~ 12.500 Hz, 38.280 ~ 39.060 Hz and 39.060 ~ 39.840 Hz decreased with the decrease of vigilance. Finally, under the recognition model established by the 8 characteristics mentioned above, the average accuracy of three-classification results over the 10 participants was as high as 88.7%. The results of this study confirmed the feasibility of pulse wave in the evaluation of vigilance, and provided a new way for the real-time monitoring of vigilance.
基于fNIRS技术的脑机接口研究
Investigation of Brain-Computer Interface Using Functional Near-Infrared Spectroscopy

学军,姜劲,潘津津,王春慧,张朕,杨涵钧,徐凤刚
- , 2017, DOI: 10.11784/tdxbz201601074
Abstract: 功能性近红外光谱技术(functional near-infrared spectroscopy, fNIRS)作为一种无损光学脑成像技术, 可用于构建脑机接口(brain-computer interface, BCI)以识别操作者肢体控制意图.利用fNIRS技术测量11位参试者的手臂伸展、腿部伸展和手指敲击的前额皮层(prefrontal cortex, PFC)和运动功能皮层(motor cortex, MC)的血氧变化信号, 并利用fNIRS的生理特征和支持向量机建立fNIRS-BCI分类器.结果表明手臂伸展、手指敲击和腿部伸展的四分类fNIRS-BCI平均正确率分别为89.32% 、88.66% 和91.35% ; fNIRS-BCI的运动想象动作的分类正确率不低于运动执行动作; 3种任务范式的混淆矩阵分析结果表明:运动想象诱发的脑功能活动与同侧肢体的运动执行、对侧肢体的运动想象活动产生混淆, 3种任务范式的同侧运动想象和运动执行的血氧数据检验结果存在显著差异.因此, fNIRS-BCI能有效识别运动想象和运动执行活动, 且运动想象和运动执行活动的血氧数据变化具有可分性.
Functional near-infrared spectroscopy(fNIRS)is a non-invasive optical brain-imaging technology which could be applied in brain-computer interface(BCI)to recognize motor intention in brain. The study used fNIRS to measure hemodynamic variation in prefrontal cortex(PFC)and motor cortex(MC)while 11 participants were completing three different movement tasks,that is,hand movement,leg movement and finger tapping. In order to discriminate between motor execution(ME)and motor imagery(MI),three fNIRS-BCI classifiers were established using fNIRS feature and support vector machine. The result shows that three four-class fNIRS-BCI classifiers,corresponding to hand movement,finger tapping and leg movement,achieve average classification accuracy of 89.32% ,88.66% and 91.35% respectively. The classification accuracy of MI by fNIRS-BCI is not lower than that of ME. The analysis of confusion matrix for three experiment paradigms shows that cerebration induced by MI confuses with ME of ipsilateral limb and MI of offside limb. The concentration of hemodynamic changes of MI and ME for the same limb in the three paradigms shows significant difference. Hence,the present study verifies the feasibility of fNIRS-BCI to differentiate between MI and ME in brain,and hemodynamic changes in response to MI and ME are separable
正性情绪面孔条件下情绪标注对正性情绪的作用研究
The Study of the Effect of Affect Labeling to the Positve Emotions in the Conditon of Positive Face Pictures
 [PDF]

岳鹏飞,学军
Advances in Psychology (AP) , 2013, DOI: 10.12677/AP.2013.33018
Abstract: 这一研究检验了两个问题。第一个是情绪标注是增强还是抑制正性情绪,尤其是对使用中文词的中国被试。第二个是非情绪标注能否抑制正性情绪。为检验这些问题,研究选择正性情绪面孔为实验材料(愉快和惊讶),以30名女大学生为被试,采用了BiopacMP150生理记录仪记录其完成任务时皮电、指温和指脉率上的变化。结果发现:不管是在皮电,皮温还是指脉率上都没有发现以下四组中任何一组中存在的显著差异:情绪标注和情绪匹配,性别标注和性别匹配,情绪匹配和性别匹配,情绪标注和性别标注。在本实验条件下没有发现情绪标注及非情绪标注对正性情绪的抑制作用。
In this study of affect labeling two questions were tested. The first one is whether affect labeling will enhance or reduce the positive emotion of subjects, especially for Chinese subjects using Chinese characters. The second one is whether using words to describe the non-emotional aspects of the positive faces will reduce the emotion or not. To test these questions, we conducted one experiment. In this experiment, 30 female university students participated. The pictures of positive faces (happy and surprise) used as materials and physiological responses, including finger temperature, skin conductance, and finger pulse, were recorded using BiopacMP150 under affect-labeling, affect-matching, gender-labeling, gender-matching, and shape- matching conditions. The results showed that in the experiment, there were no differences in finger pulse rate, finger temperatures and skin conductance between affect-labeling and affect-matching, gender-labeling and gender-matching, affect-matching and gender-matching, affect-labeling and gender-labeling. In conclusion, the results demonstrated that affect labeling and gender labeling may not reduce the activity of the autonomic nervous system of positive emotions in these conditions of this experiment.
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