自發衰減 的英文怎麼說
中文拼音 [zìfāshuāijiǎn]
自發衰減
英文
spontaneous decay-
There has been many papers to discuss the in - medium quark and gluon condensates in nuclear matter which use the models with su ( 2 ) l su ( 2 ) r sym - metry. now, we make use of the chiral model su ( 3 ) l su ( 3 ) n including the baryon octet to discuss the quark condensate < qq > in strange matter, where q is an up or down quark field. on the one hand, from the experimetal data, it is found that < qq > vac = - ( 225 25mev ) 3, on the other hand, with the hellmann - feynman theorem, quark condensate can be evaluated on the hadronic level. in this paper, we will investigate the quark condensate in strange matter with the chiral symmetry su ( 3 ) l x su ( 3 ) rspontaneous breaking lagrangian to obtain the variation of the quark condensate in the strange matter when the baryon number change. it can be applied to understand the neutron stars when the neutron star are considered to be constructed by the strange matter. because nertron stars are homogeneous and at very low temperature, we will use the mean - field approximation and zero temperature throughout this paper
鑒于已有大量文獻討論了核物質中的夸克凝聚，本文將討論在奇異物質中的夸克凝聚。而在介質中的夸克凝聚的基本公式可由hellmann - feynman理論導出，所以運用手征對稱自發破缺拉氏量以及平均場近似，我們就可以討論在奇異物質中的夸克凝聚，由所計算的結果表明： （ 1 ）奇異物質中的夸克凝聚隨奇異物質密度的增大而單調減小。 （ 2 ） -凝聚的出現對衰減率有影響。Based on the theory of the extended fractal dimension, this paper studied the attenuation level of self - similarity of various map objects with the variety of the map scale, and researched further the relationship between the scale level factor of map features and fractal attenuation
以擴展分維作為理論基礎，從變維分析的角度出發，研究地圖目標的自相似程度隨比例尺變化而衰減的規律，進一步研究地圖目標的尺度指標與分形衰減之間的關系。Experimental results are reported on temporal instability of phase - conjugate beam in a self - pumped ce : batio3 phase conjugator at 532nm. dark decay behaviors of sppc gratings in ce : batio3 are studied, for the first time to our knowledge, by measuring the decay of sppc reflectivities at 532nm and 790nm wavelengths at room temperature
首次在實驗和理論上研究了自泵浦位相共軛光柵暗衰減的特性，與以往一深一淺兩個陷阱能級參與光折變過程不同的是，發現了兩個深陷阱能級同時參與了自泵浦位相共軛光柵的建立。A typical model is the atomic barium in which the state 6s 1s0 corresponds to the ground state and the states 6s6p 1p1 and 6s6p 3p1 correspond to the excited states of strong and weak transition, respectively. the decay rates of the excited states are 47khz and 19mhz, respectively, and the ratio of them is 400
原子ba是一個典型的系統（其中能級6s ~ 1s _ 0為基態， 6s6p ~ 1p _ 1和6s6p ~ 3p _ 1分別是上述強躍遷和弱躍遷的激發能級，兩個躍遷的自發衰減速率分別為47khz和19mhz ，兩者之比為400 ） 。In section one, we analyze the mechanism of lwi gain, and study the effects of the rabi frequency q of the driving field, the injection rates ratio rb / r ~, the exit rate r0, the decay rates ~ and rab between atomic levels, as well as 3 incoherent pump rate r on the gain without inversion, dispersion and population difference of the system. in section two, we discuss the effects of the detuning of the driving field and the probe field on the gain
在第一節中分析了無粒子數反轉激光增益產生的機制、研究了驅動場的rabi頻率、粒子注入速率比值r _ b / r _ c 、粒子退出速率r _ o 、能級間的自發衰減速率r _ （ c - b ） 、 r _ （ a - b ）和非相干泵浦速率r對增益、色散和粒子數差的影響；第二節討論了驅動場和探測場的失諧對無粒子數反轉激光增益的影響。Characteristics : contain gtece pure natural olive branch extracts, milk protein and natural baihuacon centracted juice and grasses. natural lubricating ingredients can help to clean the dirty things completely, teduce ftee - radical which will make skin aged, resist itchy, bad smells, activate the skin, make up water andnutrents, recover white and tendetr, soft and flexibility. frequent use can keep the fragtant smells last for a long time, come out charming appearance
特點：蘊含萃取自希臘的純天然橄欖枝精華滋養成分、牛乳蛋白及天然百花草原液，配以天然的潤膚成分，徹底清潔皮膚污垢，減少令肌膚衰老之游離基的出現，同時抑制瘙癢、異味，有效活化肌膚，並大量補充肌膚所需養分及水份，恢復肌膚白皙嫩滑，柔軟富有彈性，經常使用，持久保留馨逸幽香，肌膚持久亮麗，散發迷人的自然魅力。In modern times, man - made destruction and irrational use make the shrubbery area reduced sharply and lead to insect and rats disaster and fire and aggravate the decline of shrubbery
近、現代以來，人為的破壞和不合理利用使灌木林面積在其自然分佈區域內迅速減少，並導致病蟲鼠害和火災的嚴重發生危害，加劇了灌木林的衰退。A third possibilty is that ivc colapsed primarily due to natural reasons ( climate change, tectonic activity along the subduction zone along the indo - asian plate boundary ) and that there was no indo - aryan invasion that took place
印度河流域文明衰落的第三個可能是由於自然因素（氣候改變，伴隨著印度雅利安人進入的可建造區域減少） ，並沒有印度雅利安人入侵的發生。They found two events showing the shortening of pulsating cycle and decaying of radiations intensity. the signatures matched theories of what scientists would predict to see. when matter is falling so close to the event horizon, it will be circling the black hole with increasing speed and its light will rapidly dim as it is stretched by gravity to ever - longer wavelengths
研究人員分析了極大量來自緻密天體天鵝座xr - 1的紫外線輻射，發現其中兩組數據顯示，輻射脈沖的周期隨時間縮短，而其強度則隨時間衰減至消失，這現象與一些物質在接近黑洞視界時繞著黑洞急促旋轉，放出的輻射因為重力紅移而衰減的情況相符。The equipments and methods were on the level of manual operation, hi this paper, author paid a systemic research into three kinds of measure means : direct current attenuation method, voltage integral method, and direct load method ; theoretically analyzed the measure methods of synchronous armature reaction reactance, and even developed a test system to automatically measure the synchronous armature reaction reactance
作者對直流衰減法、電壓積分法和直接負載法這三種測試方法的測試原理進行了較為深入、系統的研究，從理論上分析了同步電樞反應電抗參數的測試方法，並在此基礎上開發出能夠自動進行同步電樞反應電抗參數測試的系統。Real - time characteristics of data transmission, remarkable transmission, error - detection and automatic retransmission built in can protocol make it a good option for power line carrier communication, which has some obvious drawbacks such as wide - range variant input impedance, interference and signal attenuation
Can協議中數據的實時傳輸、卓越的錯誤檢出及自動重發功能為建立高效的基於電力線載波（電力線介質存在著大范圍變化的輸入阻抗，較強的干擾和信號衰減）的can通信系統提供了方便。There are many ways to generate single - photon state, e. g. attenuated laser, quantum dot, pulsed excitation of a single dipole, single nitrogen - vacancy color center in a diamond nanocrystal, cavity - qed and spontaneous parametric down - conversion ( spdc )
目前有多種方案可以制備單光子態，如直接將激光衰減至單光子水平、量子點、單熒光分子以及金剛石納米顆粒中的n - v色心、腔qed及自發參量下轉換等。In 1987, a remarkable step was made by yablonovitch, who pointed out the possibility of the realization of photonic bandgaps, localized defect modes, and their applications to various optoelectronic devices, and by john who dicussed the strong localization of electromagnetic waves in disordered photonic crystals and also predicted many interesting quantum optical phenomena that can be realized in photonic crystals such as the bound state of photons and non - exponential decay of spontaneous emission
1987年yablonovitch和john開創性地提出光子晶體這一新概念， yablonovitch指出了有可能實現光子頻率帶隙和局域缺陷模以及許多光電技術方面的應用， john則討論了在無序光子晶體中電磁波的強烈局域現象，並預言在光子晶體中存在許多有趣的量子光學現象，諸如光子局域態、自發輻射的非指數衰減。Fourth, directing against the characteristic of gear wheel vibration, have recommended drawing a certain signal with interval frequency in the signal, suppressed or decayed some signals with interval frequency in the signal, predicted the development trend of the signal, such contents as similar of analyzing the signal. such also offer the effective analysis means for the thing that the vibration signal of the gear wheel will be analyzed and researched in the future
第四，針對齒輪振動信號本身的特點，介紹了提取信號中某一頻率區間的信號、對信號中某些頻率區間的信號進行抑制或衰減、預測信號的發展趨勢、分析信號的自相似性等內容，為今後齒輪振動信號分析研究提供有效的分析手段。分享友人