自然衰變 的英文怎麼說
中文拼音 [zìránshuāibiàn]
自然衰變
英文
natural decay-
And then facing the problem of the channel estimation of the adaptive modulation system, we conclude out the channel estimation algorithms on maximum likelihood ( ml ) estimation and maximum a posteriori ( map ) estimation under the condition of flat fading channel and selective fading channel in detail. to meet flat fading channel, we simulate the relationship of the ratio between the error covariance in map estimation and ml estimation and pilot symbol message length. the conclusion can be drawn from these results
接著，對自適應調制系統中的通道估計問題難點，詳細推導了平衰落通道條件下和選擇性衰落通道條件下最大似然（ ml ）估計和最大后驗概率（ map ）估計演算法，針對平衰落通道，我們模擬了map估計和ml估計的方差與導頻符號長度的關系，模擬結果表明，錯誤方差受多譜勒頻率的變化影響最大，並且對實際的自適應調制系統，導頻符號長度的取值超過20個符號長度時， map通道估計明顯優于ml通道估計。They designed sophisticated experiments to test their hypothesis and proposed them to another chinese physicist, c. s. wu, who later confirmed their prediction of symmetry breakown in the beta decay experiment of cobalt
美籍華裔物理學家楊振寧和李政道教授相信自然界並非如此，他們提出論據並由另一位華裔物理學家吳健雄博士通過鈷的衰變實驗所證實。Conclusions ( 1 ) subacute senile mouse model can be used in immunosenesence reseach. ( 2 ) cd 137 may be an marker of aging. ( 3 ) the protection to aicd of cd137 decreased, indicate the function of cd137 was unusual. ( 4 ) the effect of d - galactose can modelling the different stage of aging. ( 5 ) the decrease of cd 137 expression on t cell from subacute senile mouse model and the aging mouse were due to the declining of their mrna. ( 6 ) the expression of cd 137 on t cells from from subacute senile mouse model and the aging mouse have a time dependently derease and the peak of cd 137 expression appeared earlier while the aging keep going on
結論（ 1 ） d -半乳糖致亞急性衰老小鼠模型t細胞cd137分子表達變化規律與自然衰老小鼠相似，造模兩個月後的大劑量組小鼠即可用於衰老個體cd137分子的相關研究。 （ 2 ）模型小鼠cd137分子表達隨衰老的發生發展呈規律性變化，提示該分子可能為t細胞衰老的分子標志。 （ 3 ）即使在衰老狀態下，機體對cd137分于的表達依然具有調控作用，提示兔疫系統的代償能力仍然存在。The peak of cd 137 expression on t cells from aging mouse appeared earlier compared with normal, and the appearance of the early peak was time dependently with aging. ( 2 ) the expression pattern of cd137 from subacute senile mouse was similar to that of the aging mouse. ( 3 ) the death ratio of t cells from aging mouse were higher than that of the normal level. ( 4 ) mrna of t cells from aging mouse and subacute senile mouse was decreased, and mrna from t cells of model mouse seem have a lower quantity than the aging mouse
提取總rna ，應用rt - pcr方法檢測cd137的mrna水平變化。結果（ 1 ） d -半乳糖致衰老模型小鼠和自然衰老模型的脾臟t細胞上cd137分子表達水平低於正常水平，表達高峰提前出現，隨后表達水平下降遲緩。 （ 2 ）在造模過程中，亞急性衰老模型小鼠cd137分子表達水平逐漸降低，分子表達峰逐漸前移。Like galileo, cassini is powered by the natural decay of the radioactive element plutonium, which generates heat that is then converted to electricity
如同伽利略號，卡西尼號的能源來自放射性元素鈽的自然衰變，產生熱后再轉換成電。Although almost all this material, which has a 24, 000 - year half - life, has since disappeared ( primarily through natural radioactive decay ), some of the plutonium itself underwent fission, as attested by the presence of its characteristic fission products
這些物質半衰期為2萬4000年，幾乎已經全部消失（主要是經由自然的放射衰變過程） ，而且部份的鈽本身又經過核分裂，這可由其核分裂產物為證。Living alone makes them more and more isolated from the community. outreaching medical services are in scarce supply and mostly focus on cases in old people s homes. those elders who are not reached remain helpless
本地獨居長者超逾十萬，部份為自願獨居者，非自願獨居者亦彼彼皆是，既然獨居已是無可避免，他們每因老化和健康衰退，漸漸變得與社區疏離。As they are positively charged, their motion will be affected by an electromagnetic field. in general, heavy atoms having atomic numbers greater than 82 would tend to emit
在自然界內大部份的重元素原子序數為82或以上都會在衰變時釋放它，例如鈾和鐳。As they are positively charged, their motion will be affected by an electromagnetic field. in general, heavy atoms ( having atomic numbers greater than 82 ) would tend to emit
在自然界內大部份的重元素（原子序數為82或以上）都會在衰變時釋放它，例如鈾和鐳。( c ) land natural productivity increase from 7843 kg / ( hm2 - a ) to 17335 kg / ( hm2 - a ) relate to altitude closely, and the mean rate of enhancing yield is 23. 53 percent in this region with annual enhancing - rate of 0. 64 percent in last 15 years. ( d ) there are many facters that have been influe ncing soil effective coefficient that ' s soil organic matter, total nitrogen, effective phosphine and soil texture in turn. in a word, attenuation cause of land productivity is the result of water and soil. ( e ) the forestland potential productivity change from 3986 kg / hm2 to 15034 kg / hm2, but it has a high distinction between southern aera and north area in yaan city. ( f ) the grassland potential productivity increase from 4085 kg / ( hm2 - a ) to 16973 kg / ( hm2 - a ), but it has a high classification of potential productivity, ( g ) ditribution map was formed of potential land productivity. ( h ) it could be act as decision support for agriculture development, national land planning and ecotop constructive, etc
5 、土地自然生產潛力水平的主要土壤限制因素為有機質、全氮，其次為速效磷和土壤質地；區域潛在生產力差異的制約因素，主要為土壤，次為水分，水、土兩項衰減合計為45 . 99 ，石棉、漢源兩縣水、土衰減達到60左右。 6 、林地潛力在3986 15034kg / hm ~ 2之間，高等級林地比重小，以大相嶺為界，北部的各縣林地生產力水平高，南部的兩縣林地生產力水平較低。 7 、天然草地生產潛力水平高，潛力在16973 4085kg / （ hm ~ 2 ? a ）之間，以高產的一、二、三級草地為主，且近10年來該比例變化不大。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。Based on these advantages we analyze the performance of constant - power variable - rate m - qam schemes for spectrally efficient data transmission over nmf channels. by introducing the adaptive modulation approach, we gain two things : 1 ) the error rate is kept at a constant level. 2 ) the achievable spectral efficiency comes within 5 db of the shannon capacity limit. at the last chapter, the presentation of a single base station and a single mobile scenario proved the feasibility of adaptive schemes
然後作者的精力轉入通道的自適應方案的研究中，首先通過研究發現nakagami衰落因子的適當調整可以近似於常見的瑞利衰落和萊斯衰落，接著研究在無線通道中採用三種不同自適應方案時的通道容量，研究表明速率的調整是增加通道容量的關鍵，在此基礎上，著重研究了離散變速率qam的情況，表明這種調制方案無論在頻帶利用率還是在系統平均誤碼率比其它情況提高很多。分享友人