When propagating light\|ray passes through two fixed points in the gradient index mediums and a cuspidal variable\|point （at this point the trace equation of propagating light\|ray is non\|differentiable） at the borderline of two different GRIN mediums, the mathematical relationship, which the trace equation of propagating light\|ray and borderline equation of two different GRIN mediums should satisfy, is derived by the Fermat's principle and calculus of variation.

當(dāng)光線通過(guò)梯度折射率介質(zhì)中兩個(gè)固定點(diǎn)和兩個(gè)GRIN介質(zhì)界線上的可動(dòng)尖點(diǎn)（光線軌跡方程的不可微點(diǎn)）時(shí)欧美精品公开视频，由費(fèi)馬原理和變分法運(yùn)算推得傳輸光線的軌跡方程與兩種不同GRIN介質(zhì)的界線方程應(yīng)滿足的微分關(guān)系式级婬片A片888AAA毛片。

As a new material with many functions: being light, heat insulation, bearing acid and alkali, non-toxic, incombustible, not having fetid odor, the floating bead of pulverize coal ash was firstly chosen to produce light preservation material. In the article, a suitable production way and a new method of using pulverize coal ash systematically were found, which had active effect on stove industry and the refractoriness of light preservation brick with floating bead is 1100~1300℃, the suitable temperature was 400~1150℃, thermal conductivity is 0.105~0.127W.

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For the requirement of high efficiency light emitting diode luminaries and the characteristics of automotive headlamp exit beam,based on non-imaging optical theory,a theory model for new type LED parabolic reflector optimal design is established to maximize the utilization of light energy of the reflection cup and to realize the asymmetric light intensity distribution of the headlamp exit beam.

針對(duì)當(dāng)前發(fā)光二極管燈具的高效率要求和汽車(chē)前照燈出射光束特點(diǎn)，根據(jù)非成像光學(xué)理論建立了新型LED拋物反射器優(yōu)化設(shè)計(jì)的理論模型偷拍照片网，實(shí)現(xiàn)了反射杯光能利用率的最大化和前燈出射光束的不對(duì)稱光強(qiáng)分布男人插女人逼逼的视频，進(jìn)而依據(jù)該模型設(shè)計(jì)了新型反射式LED汽車(chē)前照燈光學(xué)系統(tǒng)。

B The necessity of such light is evident from what has been said, for faith is essentially an act of assent, and just as assent to a series of deductive or inductive reasonings, or to intuition of first principles, would be impossible without the light of reason, so, too assent to a supernatural truth would be inconceivable without a supernatural strengthening of the natural light Quid est enim fides nisi credere quod non vides?

"有必要的国产毛片在线看，例如輕是顯而易見(jiàn)的日日插人人插，從已經(jīng)表示，為信仰本質(zhì)上是一個(gè)法的贊同国产A片址一网，正如核可了一系列的演繹或歸納reasonings 欧美黑人XXXX性高清视频，或以直覺(jué)的第一原則，將不可能無(wú)輕的原因亚洲sanji在线，所以www.99riav.m3u8，也贊同一個(gè)超自然的真理，就不能想象沒(méi)有一個(gè)超自然加強(qiáng)對(duì)自然光"的回報(bào)預(yù)測(cè)單一目的的NiSi credere和非

The study shows that: evergreen broad-leaved species during the middle and later period succession have better adaptability under the different light surroundings, such as Elaeocarpus glabripetalus, Ilex integra, Photinia prunifolia, Cinnamommum camphora. And Fluorescent Characteristics also verifies the above result. The experiment results indicate that: PSⅡreaction centers of majority tree species are not marked oxidized under the full light surroundings. Photosynthetic electron transport activity can maintain highly, in this way, it is helpful to enhance radiant energy dissipation and thus dissipate excess light energy. That is to say, the increase of non-photochemical quenching coefficient can conduce to protect PSⅡ, and mitigate the effect of high light on photosynthesis.

研究發(fā)現(xiàn)處于演替中后期的常綠闊葉樹(shù)種幼苗在线国产一区二区，對(duì)光環(huán)境的變化均有著較強(qiáng)的適應(yīng)能力操操毛片，禿瓣杜英、全緣冬青黄黄网站点击进入免费、小葉鐵冬青、桃葉石楠欧洲免费精品视频、香樟等樹(shù)種的表現(xiàn)尤為突出亚洲国产精品国自产拍AV老女人；熒光特性的研究也應(yīng)證了這一觀點(diǎn)色艹国产，測(cè)定結(jié)果表明多數(shù)樹(shù)種的PSⅡ反應(yīng)中心并未受到明顯氧化破壞，在全光照條件下仍能維持較高的光合電子傳遞活性9操视频在线观看欧美，能通過(guò)提高非輻射性熱耗散久久不卡亚洲精品国产精品，消耗PSⅡ吸收的過(guò)剩的光能，從而保護(hù)PSⅡ反應(yīng)中心免受因吸收過(guò)多光能而引起的光氧化傷害国产一级A片无码免费视频一。

Chromatic plastic film and light conversion film has been applied in protected cultivation, and plastic films with different light quality may serve as a non-chemical approach regulating growth and thermoperiodic responses of plants. A few studies showed that light quality affected growth and yield of strawberry, but little is known about its effects on photosynthesis and chlorophyll fluorescence in strawberry leaves, and fruit quality. So it is beneficial to scientific regulating growth and fruiting for strawberry protected cultivation to study on those effects and the interactions between CO2 and N supply on photosynthesis.

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It is a more stupendous reformation for solid light source. Moreover, LED possesses advantages as high quality light, non-radiation and durability and low maintenance cost which other solid light source can't compare with.

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You have to think about it like this: the light color is going to light the non occluded parts, while the dark one is going to light the occluded ones...

你必須想想這樣的：光的顏色會(huì)照亮沒(méi)有被遮住的部分超碰caop0rn超碰分类草棚，而黑暗是是遮住的部分變暗。黄色彩网。高清无码一级黄色视频。

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