聚焦“尾巴” 创造有效体育课堂

随着《体育与健康课程标准》的不断改革与发展,对学生身体素质要求不断提高的背景下,体育课堂的改革迫在眉睫。从体育课堂中,我们不难发现往往有两个层次的学生,一个是按照老师要求认真完成体育学习与练习任务的学生,一个是经常不听老师要求,做自己事情或者干扰他人学习的学生,面对这两个层次的学生,我们关注更多的是前者。但是,在近年来的课堂中,笔者发现后者才是更需要我们关注的对象,因为他们的兴趣和进步往往反映了课堂是否具有吸引力、是否有效,所以在体育课堂的改革中,应聚焦"尾巴",创造有效体育课堂。

知识分子“尾巴论”探析

"尾巴论"的产生有其社会历史的、经济的和思想文化的根源。它不仅排斥知识分子这支先锋力量,阻碍了中国经济和科学文化事业的发展,而且宣扬贬低知识的蒙昧主义价值观。在社会主义市场经济条件下清除"尾巴论"的消极影响,重塑知识分子的形象,就是要充分肯定知识分子的人格独立性,正确看待知识分子自身教育与改造,不断增强知识分子的社会价值感。

油罐车的“尾巴”

星期天早上，我和爸爸去逛街。忽然，一辆油罐车呼啸而过。咦!车后怎么还拖着一条“尾巴”呢？

我也有“尾巴”啦

放学回家的路上，我和爸爸妈妈说说笑笑．边走边聊。

可爱的“小尾巴”

今天，我起床后，穿完衣服走出卧室。这时，姐姐也出来了，看见了我，哈哈大笑起来。

羌族儿童“尾巴帽”研究

羌族的儿童"尾巴帽"是一种民间艺术,是民族服饰文化中不可缺少的组成部分,为了解童帽所隐含的民俗审美及民俗文化,以四川茂县羌族博物馆藏品为研究对象,通过实物归纳法对其材质、工艺、装饰用色、图案、装饰特点、装饰规律及所蕴含的文化内涵进行分析研究。结果表明:羌族儿童的"尾巴帽"装饰元素丰富,充满童趣,形成了自己的装饰规律,与其他类服饰相比更具特色,而且童帽丰富的文化内涵承载着羌民族的审美和情感文化符号,是民族文化的宝贵财富。通过这样的方式希望更多有志之士参与到羌族传统文化的研究中来,保护传统文化,留住传统手工艺。

“尾巴介词”须当心

介词通常放在它所支配的名词或代词之前。但在实际运用中,特别是在口语中,许多介词却要放在名词或代词之后,形成介词后置结构。这类“尾巴介词”常出现在以下句型中:1.疑问代词作介词宾语,介词可后置。例如:What will you have to pay 150 yuan for?你得付150元买什么?

ANALYSIS OF WORKING MODES OF HYBRID EXCITATION DOUBLY SALIENT MOTOR

A more accurate analysis method on working modes is proposed by considering the winding terminal voltage and the eondueting power device as state parameters. For the three-phase hybrid excitation doubly salient machine （HEDSM） motor and its three-phase full-bridge inverter, in the proposed analytical method, all possible working modes are generally listed. Then, with the H_PWM-L_ON control strategy, the working modes are detailed with eorresponding equivalent circuits. Experimental results verify the robustness of the analysis.

Differential effects of dopamine on pain-related electric activities in normal rats and morphinistic rats

Objective To investigate the influence of dopamine （DA） and DA receptor＇s antagonist on the transmission of noxious information in the central nervous system of normal rats or morphinistic rats. Methods The influence of DA on the electric activity of the pain-excited neuron （PEN） in the caudate nucleus （Cd） of normal rats or morphinistic rats was recorded after the sciatic nerve was noxiously stimulated. Results DA shortened the average latency of the evoked discharge of PEN in the Cd of normal rats, indicating that DA could increase the activity of PEN and pain sensitivity in normal rats. This effect could be inhibited by Droperidol. DA increased the average latency of the evoked discharge of PEN in the Cd of morphinistic rats, indicating that DA could inhibit the activity of PEN and pain sensitivity in morphinistic rats. Conclusion The responses to painful stimulation were completely opposite between normal rats and morphinistic rats after the intracerebroventricular injection of DA.

Large Deviations for a Generalized Compound Renewal Risk Model

This paper extends the ordinary renewal risk model to the case where the premium income process,based on a renewal counting process,is no longer a linear function;and the total claim amount process is described by a compound renewal process.For this realistic risk model,the large deviations for the claim surplus process is investigated.

Effects of appendectomy and oral tolerance on dextran sulfate sodium colitis

AIM： To evaluate the concomitant effects of appendec- tomy and oral tolerance on colitis.METHODS： Delayed-type hypersensitivity （DTH） was investigated at a 7-d interval after ovalbumin （OVA） ad- ministration and immunization under normal and colitis conditions in appendectomized or sham-operated mice. Pathological scores for the colon were graded after in- gestion of colon-extracted protein （CEP） and induction of dextran sulfate sodium （DSS） colitis in appendecto- mized or sham-operated mice. Thereafter, Thl and Th2 in Peyer＇s patches and spleen lymphocytes were de- tected in CEP-treated and bovine serum albumin （BSA）-treated control mice.RESULTS： In appendectomized mice, DTH was not inhibited at day 7 after OVA administration and at the initial phase of DSS colitis, whereas it was inhibited at day 14 and day 21. However, in sham-operated mice, it was inhibited during the whole procedure and the onset of DSS colitis. The protective role of CEP against DSScolitis was present in sham-operated mice, with pre- dominant improvement of colonic pathological changes, while vanished in the appendectomized mice. A shift from Thl to Th2 in Peyer＇s patches resulted from a de- crease of Thl cells with the ingestion of CEP. Compared with BSA in the sham-operated group, no predominant changes were observed in the appendectomized mice.CONCLUSION： Appendectomy interferes with the pro- tective role of CEP in DSS colitis via a shift from Th2 to Thl during oral tolerance induction.

Interspecific Variation of Micromorphology of Glandular Trichomes between two Salvia Species in South Albania

Micromorphology of glandular hairs on the leaves of Salvia officinalis L. and Salvia triloba L. was investigated by light microscopy. We noticed similiarity and variation between the two species regarding morphology of glandular trichomes. Two main types of glandular trichomes were identified on both species： peltate and capitate. Peltate trichomes consisted of a basal cell, one stalk cell and a large multisecretory head in S. officinalis L. In S. triloba L. peltate trichomes posses a basal cell, a short unicellular stalk, and a large secretory head with 8 secretory cells. In Salvia officinalis L., four types of capitate trichomes have been distinguished. Five types of capitate trichomes have been found in Salvia triloba L. The fifth type of capitate trichome, called digitiform trichome was found in S. triloba L. This determined interspecific diversity between the two Salvia species.

Images of Modernity in Cosmopolitan Alexandria in Jacqueline Carol＇s Cocktails and Camels

The paper proposes to examine aspects of modernity in Cosmopolitan Alexandria in the first half of the 20th century as they are manifested in Jacqueline Carol＇s Cocktails andCamels （1960 and reprinted in 2008）. Written in English by a Lebanese Egyptian, born and raised in Alexandria, the novel investigates issues of cultural and linguistic identity, gender, the rise of national discourse, and the emergence of independent Egypt after the 1952 Revolution through the eyes of a young woman growing up in Cosmopolitan Alexandria as part of the elite but paying attention to all the political and social changes taking place in the city and the whole country

The effects of attached flexible tail length on the flow structure of an oscillating cylinder

Particle Imaging Velocimetry （PIV） is utilized to investigate the flow structures of an oscillating cylinder attached to a flexible tail. At the same oscillation frequency and amplitude, the mean streamwise velocity along the wake central-line and the mean vertical velocity around the trailing edge of the flexible tail can be greatly increased with the tail length. Meanwhile, the longer the flexible tail is, the larger its deformation is. In order to study the influence of flexible tail length on the wake pattern of the experimental model, the relationships between the swirling strength Aci of vortex structure near the tail end and the velocity of tail trailing edge have been revealed. Moreover, the convection tracks and the Aci of vortex cores for different flexible tails are discussed.

Influence of tail-like magnetic field on O^+ ion distribution in the Martian magnetosphere

Based on the comparison with the Earth, using the LB magnetic field model, the distribution of O+ ion originating from the ionosphere in the Martian magnetosphere is theoretically studied under different conditions of the tail-like magnetic field. The results show that the tail-like magnetic field has influence on the O+ ion flux in the Martian magnetotail: (i) the O+ ion flux in the Martian tail will increase if the tail-like magnetic field increases; when the tail-like magnetic field increases from 5 nT to 20 nT, the O+ ion flux increases 3 times in the region of 2.8R m in the Martian tail; and (ii) the O+ ion flux decreases with increasing intrinsic moment; when the intrinsic moment increases about 5 times, the flux decreases to one fourth in the region of 2.8R m in the Martian tail. According to the data on the O+ ion flux and theoretical result in this paper, the deduced Martian intrinsic moment is about 2 ×1021 Gcm3. This is consistent with the most recent observation by the USA satellite MGS.

Random difference equations with subexponential innovations

We consider the random difference equations S =_d(X + S)Y and T =_dX + TY, where =_ddenotes equality in distribution, X and Y are two nonnegative random variables, and S and T on the right hand side are independent of(X, Y). Under the assumptions that X follows a subexponential distribution with a nonzero lower Karamata index, that Y takes values in [0, 1] and is not degenerate at 0 or 1, and that(X, Y) fulfills a certain dependence structure via the conditional tail probability of X given Y, we derive some asymptotic formulas for the tail probabilities of the weak solutions S and T to these equations. In doing so we also obtain some by products which are interesting in their own right.

Bite me： Blue tails as a ＇risky-decoy＇ defense tactic for lizards

Many lizard species use caudal autotomy to escape entrapment. Conspicuous coloration may increase the likelihood of being attacked, but if that attack can be directed towards the autotomous tail this may ultimately increase the chances of the lizard surviving a predatory attack. We tested the hypothesis that brightly-colored tails function to divert predatory attention away from the head and body using pairs of blue-tailed and all-brown clay model lizards. Predatory bird attacks on the 24 blue-tailed models occurred sooner （P = 0.001） than attacks on the 24 all-brown models, and over 7 days blue-tailed models were attacked more often than all-brown models （P = 0.007）. Blue-tailed models were, however, more frequently attacked on the tail than other parts of the body （P 〈 0.001）, while all-brown models were more frequently attacked on the head and body （P = 0.019） which would be more likely to be fatal for a real lizard. Our results suggest that models with a blue tail were more conspicuous than all-brown models, attracting attacks sooner and more often, but that the attacks were predominantly directed at the tail. It is better for individuals to be attacked unsuccessfully many times, than successfully just once. Having a brightly-colored tail may, therefore, act as a ＇risky decoy＇. Despite increased conspicuousness, a blue tail increases the likelihood that the lizard would be able to effect escape through caudal autotomy rather than being grabbed by the head or body [Current Zoology 60 （3）： 333-337, 2014].