共查询到20条相似文献，搜索用时 140 毫秒
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通过对γ射线暴能源机制研究，讨论了宇宙学距离处γ射线暴的能量来自奇异星相变的可能性，认识了奇异星模型的独特优势．火球模型被认为是γ暴的标准模型，而火球产生的机制是多方面的，其中之一就是奇异星相变，它既解释了γ暴的短时标、高能量特征，又避免了火球的重子污染这一最大难题。 相似文献
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指出快速旋转的新生中子星内部存在着从正常强子物质到夸克胶子等离子体的相变过程,而γ射线暴所释放的巨大能量可能正是这种相变过程的结果。在新诞生的中子星通过偶极电磁辐射和四极引力辐射损失能量而减速时,其中心密度增加,并可能达到QCD的相变密度(原子核密度的5～10倍)。这种相变所释放出的能量可以解释γ射线暴的强大能量暴发及其聚束效应。γ射线暴位置附近相当致密的气体环境和在其X射线余辉中金属发射线的观测是对这种观点的支持。我们还给出了一些预言。 相似文献
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赵雪军 《喀什师范学院学报》2015,(2)
暴恐案件的发生与暴恐音视频的传播关系极大,如何有效的遏制暴恐音视频的传播是值得思考的问题。加大法律惩处力度,提高人民的法律意识,筑牢防御网络等都是有效治理暴恐音视频的应对之策。 相似文献
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近年来,我们海州区农村公路在夏季经常发生水泥路面暴裂的状况,特别是当室外温度达到30度以上,路面温度达到40度以上时,暴裂现象就会发生。且时间多集中在每年的7、8月间,像2012年7月20日县道x201锦屏镇狮树段,今年7月9日县道x301锦屏桃花段路面暴裂现象,暴裂路面有时呈破碎,有时两块水泥板高高拱起呈三角高于路面几十公分。由于发生暴裂的时间不确定性,有时会给行人车辆造成伤害和损失,严重影响交通秩序。 相似文献
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李黄珍 《职业技能培训教学》2004,(10):18-21
中国内陆第一批反劫制暴谈判专家的出炉标志着中国的反劫制暴谈判进入了一个崭新时代，同时也标志着中国职场上注入了一股生机无限的新鲜血液。“谈判专家”，一个被专业化了的职业新名词，它将和任何一份职业一样，具有其新生力量的划时代意义和美好前景。 相似文献
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新疆暴恐犯罪防控研究 总被引：2，自引：0，他引：2
杨正文 《绵阳师范学院学报》2015,(4):31-35
近年来,新疆地区的暴力恐怖犯罪愈演愈烈,对我国经济和社会建设造成了巨大危害。要有效防控暴恐犯罪,必须标本兼治、双管齐下。"治标",即对当前猖獗的暴恐犯罪必须从严惩治,遏制其蔓延势头;"治本",乃是要从犯罪学视角找寻犯罪根源,从而对症下药,消除暴恐犯罪的诱因与条件。 相似文献
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王高 《中学物理教学参考》1997,(3)
γ射线及其应用王高（江苏省阜宁师范学校，２２４４００）γ射线是法国人维拉德在１９００年研究镭的放射性时发现的．后来，卢瑟福与他人合作，测定了γ射线的性质和波长，确认γ射线是一种比Ｘ射线频率更高的电磁波；γ射线是高能光子，它的穿透力很强；能使乳胶感光；... 相似文献
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许富宏 《安徽师范大学学报(人文社会科学版)》1997,(4)
学术界有人把屈原作《哀郢》与“庄暴郢”联系起来，并认为庄是农民起义领袖。而据《荀子》、《吕氏春秋》等记载，庄乃是楚怀襄之世的将军，他率军掘墓暴虐于郢都，致使“楚分而为三、四”，这与《哀郢》所写景象不合，故二者并无关联 相似文献
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Leonard F. Jakubczak 《Learning & behavior》1973,1(1):13-16
The purpose of this experiment was to determine whether age differences in amounts of wheel running of starved rats were due to the frequency of bursts of running, to the average duration of bursts, to speed, or to any combination of these parameters. The experiment was carried out according to a 3 by 2 by 2 mixed model design. The independent variables were age (67, 293, and 746 days old at the start of starvation), food deprivation (total starvation vs ad lib), and occasion of measurement (initial vs maximum activity). The dependent variables were number of wheel revolutions, number of bursts of activity, number of seconds of running per burst, and revolutions per second. The results indicated that acutely starved rats run more often, for longer periods, and at higher speeds than do sated rats, and that with increased age rats run less often, for a shorter time, and at slower speeds. 相似文献
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Peter E. Jenkins 《Learning & behavior》1981,9(4):501-507
In Experiment 1, pigeons were exposed to a discriminative autoshaping procedure in which one keylight was correlated with negative automaintenance and the other keylight was correlated with positive automaintenance. The negative automaintenance procedure maintained shorter keypeck durations than the positive automaintenance procedure. Keypecking tended to occur in bursts of two, three, or four pecks, and within these bursts keypeck durations reliably decreased. In Experiment 2, keypeck durations and off-keypecks were initially examined during exposure to a positive automaintenance procedure. When a negative keypeck-reinforcer contingency was introduced, keypeck durations decreased and the ratio of off-keypecks to on-keypecks increased. When a positive keypeck-reinforcer contingency was introduced, keypeck durations increased and the ratio of off-keypecks to on-keypecks decreased. These results suggest that keypeck duration is determined by the extent to which the peck is directed at the key. 相似文献
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一篇奏议能使秦王收回成命,足见其蕴藏着强大的感染力和说服力,也显示了李斯<谏逐客书>作为千古绝唱的不可阻挡的魅力冲击及论辩艺术. 相似文献
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春天并非总是一模一样，四月，有时不经意一跃，就来到了弗吉尼亚的山坡上——自然的大舞台上转眼到处生机勃勃。郁金香组成了大合唱，连翘展示出优美的舞姿，洋李奏起了华彩乐段。一夜之间，林木着装，绿叶瑟瑟。 相似文献
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Three rats were trained under a discrimination procedure in which responding was reinforced only following the repeated presentation of three bursts of white noise (S+). S? consisted of presentations of either two or four bursts of noise. All animals responded significantly more in the presence of S+ and, in two cases, showed lower response rates to both “2” and “4” stimuli. Responding by the third animal revealed differentiation between S+ and the stimulus “2,” but no reliable suppression to stimulus “4.” The present instances of discriminative control by the stimulus “3” replicate Fernandes and Church’s (1982) demonstration of control by sequential auditory stimuli in the rat. Moreover, because the present procedure involves adjacent S? values both greater as well as less than S+, these results extend our knowledge of the rat’s abilities with sequential auditory stimuli: Rats are capable of making intermediate numerical discriminations based upon something other than a simple many-versus-few dichotomy. 相似文献
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Biman Nath 《Resonance》2009,14(10):985-995
Gamma ray bursts — which are first detected in energetic gamma rays and which then glow in X-ray, visible and radio wavelengths
— are the result of the biggest explosions in the universe. Astronomers wonder what causes these violent events, and some
of their ideas are discussed in this article. 相似文献
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和合文化是中国传统文化的精髓,它从战争观、战略理论和战争价值取向三个层面塑造了独具特色的中国传统战争价值理念,即贵和慎战的战争观、全胜不斗的思想战略境界和大一统的价值取向。其和平主义的价值取向与西方崇尚暴力的传统形成了鲜明的对比,在和平与发展成为时代主题的今天日益显示出了强大的生命力。 相似文献
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苏共二十大并不是中苏同盟关系破裂的标志,台海危机及赫鲁晓夫对中国人民公社的批评、撤出在华专家才是导致中苏同盟关系破裂的两个主要事件。国际主义与民族主义追求的矛盾,以意识形态的同一性掩盖国家利益的差异性;把党际关系等同于国家关系也是同盟关系破裂的重要原因。 相似文献