Static image compression based on fractal theory

１ＩｎｔｒｏｄｕｃｔｉｏｎＴｈｅｆｒａｃｔａｌｇｅｏｍｅｔｒｙｗａｓｅｓｔａｂｌｉｓｈｅｄａｔｔｈｅｂｅｇｉｎｎｉｎｇｏｆｔｈｅｃｅｎｔｕｒｙ．Ｍａｎｄｅｌｂｒｏｔｐｒｅｓｅｎｔｅｄｔｗｏｆｒａｃｔａｌｄｅｆｉｎｉｔｉｏｎｓｉｎ１９８２ａｎｄ１９８４...     

Effects of short-term detraining on measures of obesity and glucose tolerance in elite athletes

Athletes frequently adjust their training volume in line with their athletic competition schedule, onset of sport injury, and retirement. Whether maintenance of partial training activity during the detraining period can preserve optimal body composition and insulin sensitivity is currently unknown. Sixteen elite kayak athletes (mean VO2max: 58.5 ml.kg(-1).min(-1), s = 1.77) were randomly assigned to a totally detrained group (age: 20.8 years, s = 0.7; body mass index: 23.74, s = 0.54) or partially detrained group (age: 21.8 years, s = 0.7; body mass index: 23.20, s = 1.02), whereby totally detrained participants terminated their training routine completely and the partially detrained participants preserved approximately 50% of their previous training duration with equivalent intensity for one month. Body mass, waist circumference, oral glucose tolerance test, insulin, leptin, cortisol, and testosterone were measured during the trained state and after detraining. Waist circumferences for both the partially detrained and totally detrained groups were significantly elevated after detraining, with no group difference. However, body mass was reduced in both groups. Significant elevations in the area under the curve for insulin and fasted leptin with detraining were observed. These changes were greater in the totally detrained participants. In conclusion, the present results show that maintaining partial training activity cannot prevent an increase in waist circumference. During the detraining period, the magnitude of increase in plasma insulin and leptin concentrations was regulated in an activity-dependent manner.     

Mobile MicroRobotin Small Pipe Driven by ElectroMagnetic Force

１　Ｉｎｔｒｏｄｕｃｔｉｏｎ　Ｍｉｌｌｉｍｅｔｅｒｓｉｚｅｍｉｃｒｏｍａｃｈｉｎｅｓｂａｓｅｄｏｎｍｏｄｅｒｎｐｒｅｃｉｓｉｏｎｍａｃｈｉｎｉｎｇｈａｖｅｐｏｔｅｎｔｉａｌａｐｐｌｉｃａｔｉｏｎｉｎｉｎｄｕｓｔｒｙ．Ｓｏｍｅｎａｒｒｏｗｓｐａｃｅｓｏｒｓｍａｌｌａｒｅａｓｎｅｅｄｔｈｅｓｅｍｉｃｒｏｍａｃｈｉｎｅｓｔｏｉｎｓｐｅｃｔａｎｄｒｅｐａｉｒｄｅｆｅｃｔｓ．Ｒｅｓｅａｒｃｈｅｒｓｈａｖｅｗｏｒｋｅｄｏｎｆａｂｒｉｃａｔｉｏｎｏｆｖａｒｉｅｄｖｅｈｉｃｌｅｓｗｉｔｈｗｈｅｅｌｓ,ｍｏｂ…     

Triboelectric nanogenerators as wearable power sources and self-powered sensors

Smart we arable technologies are augmenting human bodies beyond our biological capabilities in communication,healthcare and recreation.Energy supply and information acquisition are essential for wearable electronics,whereas the increasing demands in multifunction are raising the requirements for energy and sensor devices.The triboelectric nanogenerator(TENG),proven to be able to convert various mechanical energies into electricity,can fulfill either of these two functions and therefore has drawn...     

Nitrogen addition delays the emergence of an aridity-induced threshold for plant biomass

Crossing certain aridity thresholds in global drylands can lead to abrupt decays of ecosystem attributes such as plant productivity, potentially causing land degradation and desertification. It is largely unknown,however, whether these thresholds can be altered by other key global change drivers known to affect the water-use efficiency and productivity of vegetation, such as elevated CO₂ and nitrogen(N). Using >5000 empirical measurements of plant biomass, we showed that crossing a...     

YTHDF2-mediated regulations bifurcate BHPF-induced programmed cell deaths

N6-methyladenosine(m⁶A) is a critical regulator in the fate of RNA, but whether and how m⁶A executes its functions in different tissues remains largely obscure. Here we report downregulation of a crucial m⁶A reader, YTHDF2, leading to tissue-specific programmed cell deaths(PCDs) upon fluorene-9-bisphenol(BHPF) exposure. Currently, Bisphenol A(BPA) substitutes are widely used in plastic manufacturing.Interrogating eight common BPA substitutes, we detected BHPF in ...     

Mapping uncovered a multi-phase arc-back-arc system in the southern Beishan during the Permian

<正>The Central Asian orogenic belt(CAOB),surrounded by the Baltica and Siberia cratons to the north,and the Tarim and North China cratons to the south,records successive evolution cycles of subduction and accretion/collision from Neoproterozoic to the Paleozoic that consumed and eventually closed the Paleo-Asian Ocean[1].Tectonic models of the terminal orogenesis are contentious,with discussions ranging from the time and location of final closure of the Paleo-Asian Ocean to the regional co...     

优秀乒乓球运动员接受刺激前的脑电α频段功率与反应时间的关系

乒乓球属于开放式运动项目,它要求运动员的反应既要快又要准.目前,有关EEG与反应时之间关系的研究存在分歧.而对哪些脑电活动有利于优秀乒乓运动员反应的研究更少.研究目的探索运动员接受刺激前的脑电α频段功率与反应时之间的关系.研究对象15名优秀男子乒乓运动员,年龄为16～35岁,均为右势手.研究方法被试者完成一项有提示的反应任务,同时,记录大脑F3、F4、C3、C4、T5、T6、P3、P4、OL、OR处的脑电α频段功率值.反应任务由一个提示性刺激和必须应答的刺激组成.被试者通过按鼠标做反应.提示性刺激和必须应答的刺激间间隔1500ms.分别计算出前750ms和后750ms的α1和α2频段的功率值.根据中位数把被试者分为反应快组和反应慢组.对测试结果进行双因素方差分析.研究结果左顶和右后枕区的α 1频段功率值表现出反应时与脑电的测试时间存在交互作用.进一步的分析结果表明,反应快者在提示刺激与必须应答的刺激间的前750s的脑电α 1频段的功率值高.这一结果说明左项和右后枕区的α 1频段的功率值可能是乒乓训练中有效反应的关键.     

An Interpretation of“Flowers”and“Man”in Lady Chatterley's Lovers

Flowers often appear in D.H.Lawrence’s works as a symbol of life,nature and love.In Lady Chatterley’s Lovers,flowers almost reflect all the characteristics of the characters.Lawrence uses flowers as a metaphor of perfect females in the world.Such females possess spiritual purity and natural life,just as wild flowers in full bloom.     

Simulation of conformational preconditioning strategies for electrophoretic stretching of DNA in a microcontraction

We have used Brownian dynamics-finite element method to examine two conformational preconditioning approaches for improving DNA stretching in a microcontraction for the purpose of direct gene analysis. The newly proposed "pre-stretching" strategy is found to significantly improve the degree of DNA extension at the exit of the contraction. On the other hand, applying an oscillating extensional field to DNA yields no preconditioning effect. Detailed analysis of the evolution of DNA extension and conformation reveals that the success of our "pre-stretching" strategy relies on the "non-local" effect that cannot be predicted using simple kinematics analysis. In other words, accurate prediction can only be obtained using detailed simulations. Comparing to the existing preconditioning strategies, our "pre-stretching" method is easy to implement while still providing a very good performance. We hope that the insight gained from this study can be useful for future design of biomicrofluidic devices for DNA manipulation.