選擇差 的英文怎麼說

中文拼音 [xuǎnzháichā]
選擇差 英文
selection difference
  • 選 : Ⅰ動詞1. （挑選） select; choose; pick 2. （選舉） elect Ⅱ名詞（挑選出來編在一起的作品） selections; anthology
  • 擇 : 擇動詞（挑選） select; pick; choose
  • 差 : 差Ⅰ名詞1 （不相同; 不相合） difference; dissimilarity 2 （差錯） mistake 3 [數學] （差數） differ...
  • 選擇 : select; choose; opt; election; choice; culling; alternative
  1. 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。
  2. They are jinfo mountain in nanchuan county ( natural protection section ), wuling mountain in qianjiang county ( national emphases forest demonstration county which forest cover rate is beyond 50 % ) and zhongliang mountain in beibei county ( artificial destruction is very grave ). some main land use patterns i. e. woodland, garden, infield, abandon infield, shrub and grassplot are selected in those three sample sites. four aspects on soil fertility index of karst environment under different land use patterns in these three sample sites, are revealed in this paper, by using the field test, indoor measure and analysis, outdoor experiment and field investigation, and the knowledge and technique of soil, ecology, physics and chemistry etc. they are physical characteristic ( effective soil thickness, organic layer thickness, soil texture, water - stable aggregate and soil water etc. ), chemical fertility ( organism, omni - n, omni - p, omni - k, alkali - nitrogen, available p, available k and rapid available k etc. ), soil animalcule ( bacteria, fungi, actinomyces and their grosses ) and soil - seed - pool ( plant community diversity index ) in karst ecosystem

    本研究以重慶市的南川金佛山（自然保護區） 、黔江武陵山（國家重點退耕還林示範縣，森林覆蓋率50以上）和北碚中梁山（遭人為破壞嚴重）典型巖溶區為對象，選擇了幾種重要的利用方式，包括林地、果園、耕地、棄耕地和灌草坡，採用野外巖溶生態調查和室內試驗測量分析相結合的方法，以不同土地利用方式巖溶土壤肥力為重點，對不同土地利用方式土壤肥力特徵進行量化分析，找出巖溶土壤肥力差異的主要方面及其根本原因，論文主要從土壤剖面物理退化指標（有效土層厚度、有機質層厚度、質地、團聚體、水分含量等） ，化學肥力退化指標（有機質、全n 、全p 、全k 、堿解n 、速效p和速效k等） ，樣地土壤微生物指標（細菌、真菌、放線菌數量及總量）以及樣地土壤種子庫植物群落多樣性等4個方面對重慶典型巖溶區的土壤肥力特徵進行了較為詳細的分析研究，為巖溶地區士壤資源的合理利用及結構的調控管理提供依據。
  3. And understanding and studying the spectral features and variation rules of geo - targets in the experimental area, raising that it is the basis of geo - targets information collection with imaging spectrometer data to understand spectral features and variation rules of geo - targets, realizing that in a great extent spectral - integrated - form - based classification method can remove the phenomenon of " different spectrum with same objects " resulted from reflection ratio curve translation because of the angle change among sensor, targets and observation direction, and the average and variance images can be introduced to solve the problem of two kinds of geo - target with similar spectral forms and much different values of whole reflection ratio. it is suggested that " red edge " range bands of vegetation, which has close relationship with vegetation cover and biomass, is the main characteristic bands and important basis for careful vegetation classification and quantitative retrieval, and pixel - based derivative spectral analysis is very useful for removing the effects of soil background values and quantitatively retrieving vegetation biomass and cover. the remote sense quantitative retrieval model is developed for main appraisable factors of desertification monitoring assessment with imaging spectrometer data and then the applicability of model is analyzed

    研究結果如下：首先針對荒漠化地區的地物特徵，對高光譜數據不同波段的數據質量、波段組合進行了評價，提出了適用於荒漠化監測的基本波段選擇集；初步了解和掌握了研究地區的地物光譜特性及變異規律，進一步明確了掌握地物光譜特徵和變異規律是用成像光譜儀數據提取地物信息的基礎；發現了基於光譜整體形狀的分類方法在很大程度上能夠消除由於傳感器、地物目標觀測方向之間的角度變化引起的反射率曲線整體平移的「同物異譜」現象，對于譜形相似而整體反射率的值相差較大的兩類地物，通過引入均值和方差圖像參與分類得到解決；研究還表明在植被「紅邊」范圍內的波段是進行荒漠化監測的主要特徵波段，這些波段與植被生物量和蓋度都有密切的關系，是開展精細植被分類研究和植被定量反演的重要基礎；像元的導數光譜分析可以消除土壤背景的影響，是進行植被生物量和蓋度定量反演的有力工具；建立了荒漠化監測主要評價因子的定量反演模型，並分析了模型的適用性。
  4. Abstract : based on a numbers piled up for varies resources ( labor, materials, mechines ) in neuron plan, a composed distribution for various resources was obtained. then, using time difference and quantities of materials, the best selected work and time started as astrictive conditions, the best optimum distribution which satisfied variou resources in difference optimodel and astrictive conditions was got

    文摘:將多種資源（人工、材料、機械）的數量同時在神經網路計劃技術上實行數字化疊加，從而獲得多資源疊加的合成分佈，再利用神經網路計劃技術中各個工作的不同時差和資源數量，按收斂條件選擇最佳開工工作和開工時間，滿足多種資源在優化模式中按收斂條件進行最優分佈
  5. The thesis, somehow, is a summary, which expounds the main contents of traditional portfolio theory ( tpt ) and mpt, also gives a comparison between tpt and mpt ; analyses two aspects of markowitz theory, one is the effects of risk disperses and the demonstration, the other is how to make an optimal portfolio strategy ; researches into capital assets pricing model ( capm ), factor model ( fm ) and arbitrage pricing theory ( apt ) respectively in three parts ; studies another two parts, one is the premise of mpt, which is the efficient market hypothesis ( emh ), the other analyses the behavior finance theory ( bft ) produced in the background of challenging and querying to emt and capm. the thesis finally discusses the researching and applying prospects of mpt in china

    論文對現代資產組合理論與傳統資產組合理論分別進行了分析，並對兩者進行了比較研究，對馬克維茨的均值? ?方差理論從資產組合風險分散效應和最優資產組合選擇兩方面進行了重點分析，對資本資產定價模型、因素模型、套利定價理論進行了一定深度的分析和研究，對現代資產組合理論的前提假設? ?有效市場理論及在對有效市場理論和資本資產定價模型形成挑戰和質疑背景下提出的行為金融理論進行了論述，論文最後分析了現代資產組合理論在我國的研究及其應用的廣闊前景。
  6. At 70c, dissolved time 60min, solvent ratio 125 : 50ml / g, the effect of benzene is best to separating phenanthrene of crude anthracene, phenanthrene content of crude anthracene is increased from 10. 3 % to 41. 7 %. at 120c, dissolved time 80min, the solvent ratio 75 : 30ml / g, the effect of dmf is best to separate carbazole from the compound of anthracene and carbazole, and in the high or common temperature when the compound is separated the solid content may be seen that anthracene content is almost. so, the common temperature is selected in the filtration of the experiment

    苯在70 』 c 、溶解時間60min 、溶劑比125 : 5oml / g ，對分離粗蔥中菲的效果最好，可以使粗蔥中菲的含量從10 . 3 %提到41 . 7 % 。 dmf在120 』 c 、溶解時間somin 、溶劑比75 : 30ml / g時，對分離蔥和咔哇混合物中咔哇的效果最好，並且從高溫和低溫下分離后得到固體含量可以看出，在這兩個溫度下過濾得到蔥的含量差不多，因此，本實驗選擇在常溫下過濾。
  7. On the base of researching the theory of the scheme and analyzing the signal feature, it is obtained that the existence manners and character of distance information in the differential frequency signal. at the same time, a new conclusion is gained that the technology of frequency agility can decrease the constant error of system. it is also to say that frequency agility and frequency modulation fixed - distance fuze has the similar feature to random period frequency modulation fixed - distance fuze. according to the theory of address coding in the hopping - frequency communication, the paper presents the principle of selecting the frequency agility sequence which fit to the radio fuze and constructs the frequency agility sequence family based on the rs codes

    在深入研究方案原理和分析信號特徵的基礎上，獲得了該體制引信差頻信號中，距離信息的存在形式和特點，得出了頻率捷變技術的引入降低了系統定距固定誤差這一新的結論，即頻率捷變調頻定距引信在定距性能上具有類似隨機周期調頻定距的特徵。本文引入跳頻通信地址編碼理論，結合無線電引信的具體特徵，提出了適用於無線電引信的頻率捷變序列的選擇原則，並構造了基於rs碼的寬間隔頻率捷變序列族。
  8. The variable selection in covariance adjusted estimates

    協方差改進估計中的變量選擇
  9. According to marketing segmentation theory and positional theory, the paper considers the corporation ’ s ability and resource and chooses the professional hybridized pig culturist and scattered hybridized pig culturist. after making a market research and gaining the data and using the joint - analytical method of orthogonal design method to calculate the product preference of market culturist, then comparing the market position of competitor, the paper ensures kangda corporation ’ s product position to supply the differential marketing strategy

    在此分析基礎上，本文根據市場細分和定位理論，結合公司的能力和資源，評估和選擇了土雜豬專業戶和土雜豬散戶這兩個具有發展潛力的細分市場，並根據市場調查獲得的數據，採用基於正交設計的聯合分析法分別獲得了目標市場養殖戶購買偏好，結合競爭對手的市場定位，確定了公司市場定位，為后續的差異化營銷策略制定提供支撐。
  10. Then ， in order to open out the difference of the ways of their study between the collative school and the exegetic school ， we have introduced 53 typical cases of textual research ， which separately belong to five parts - distinguishing the forms ， discussing the pronunciations ， explaining the meanings ， collation ， explaining the medical principles ， in the latter part of dissertation ， and introduced every case by the order - [ original text ] [ collation and exegesis of past years ] [ textual research of anhui school ] [ commentary ]

    論文下篇則選擇了53例典型的考證釋例，分辨形例、考音例、釋義例、校勘例、釋醫理例五個部分，逐條按原文、歷代校注、皖派考釋、評析進行介紹，以展示「校詁派」與「注釋派」的治學方法的差異。
  11. Only the plants were infested by p. xylostella or being infested by p. xylostellam, the volatiles from chinese cabbage were more attractive to females than those from the common cabbage. ( 5 ) the host foraging behaviour of d. semiclausum was studied in the laboratory. the p. xylostella larvae and their feces, silk, regurgitant, exuviae could elicit host foraging behaviour by d. semiclausum females

    本文首次研究了寄主植物的揮發物在小菜蛾和半閉彎尾姬蜂寄主選擇中的作用，初步明確了小菜峨及半閉彎尾姬蜂對不同寄主植物產卵選擇行為差異的化學基礎，並對半閉彎尾姬蜂的寄主搜索行為及學習行為進行了首次研究。
  12. The combinatorial separation include selective fragmentized separation, primary election and manual election, magnetic separation, difference speed fragmentized separation and auto - transmission line of msw

    包括選擇性破碎分選、初選與人工手選、磁選、差速式破碎分選和物料自動輸送線。
  13. 2. having made suggestions of reflecting differences in objectives, contents, implementation and evaluation etc. of the course in key high schools abroad. thus, teachers can choose different course to teach according to their own advantage, while the students can choose different courses to learn according to their own needs

    通過對國外高中數學課程的考察，提出重點高中在數學課程目標、數學課程內容、數學課程實施和數學課程評價各方面體現差異化，並根據時代的不同而呈現差異化，教師可根據自身的特點選擇差異化的課程，學生也可根據自己的需要選擇差異化的課程。
  14. Doas is adopted based on the existing laboratory condition

    針對現有實驗條件選擇差分吸收檢測法。
  15. How to discriminate between internal fault and magnetizing inrush current is the difficulty of transformer protection when apply differential relay

    變壓器主保護選擇差動在原理上存在不足，帶來的問題就是如何準確鑒別勵磁涌流與內部故障，這也是目前變壓器保護的難點。
  16. Speaking of the accounting firms ’ basic strategy localization, it will be helpful to achieve their strategic goal that the small accounting firms ’ adopt “ overall cost leadership ” or “ focus ” strategy while the large scale accounting firms choose “ differentiation ” strategy

    就會計師事務所的基本戰略定位而言，小型會計師事務所採取成本領先和目標集聚戰略而大中型會計師事務所選擇差異化戰略將有助於其戰略選擇目標的實現。
  17. After an analysis of the industrial elements of the finance and economics newspapers and using swot method, the author points out that if a finance and economics newspaper enterprise wants to establish the competitive positions, one cannot neglect the fact that on the one hand, it is necessary to adopt the cost advantage strategy, on the other hand, cost advantage strategy is hard to realize because of the particularity of this kind of newspaper industry

    在分析了財經報紙的行業結構要素及進行了swot分析后，筆者指出，財經類報紙要想確立起競爭地位，一方面不能忽略成本領先戰略；另一方面，由於財經報紙的特殊性，成本領先戰略相對難實現，所以筆者強調，要想在讀者中迅速建立起最為主流的形象，盡快擴大市場份額，財經報紙必須選擇差異化戰略和品牌戰略來參與競爭。
  18. Firstly, the governments should change their functions, and realize the indirect management through perfecting the legislation and enforcing the law strictly. secondly, the councils should play the important role of an administrator and server for all the members. thirdly, the enterprises, whose object is to meet the need of clients, should draw up and implement the effective development strategies which are divided into three parts in the paper : product - market selection, diversity, and human resource

    然後論文提出可以通過政府、行業協會和所有工程咨詢企業的共同努力來解決這一難題：政府要積極轉變職能，通過完善立法和嚴格執法來實現對行業的間接管理；行業協會要肩負起有關行業自律和自我服務的重任，加強對成員企業的管理與服務；企業作為市場的真正主體，需要制定和實施有效的發展戰略，對此論文中按業務選擇、差異化和人力資源三層進行研究。
  19. A long shape green, 50 - yard deep from the front to the back, 3 clubs difference depends on pin location

    長條型的果嶺，前後縱深達50碼，號數的選擇差別可以到達3號。
  20. By analyzing the major factors that effect to the index of passenger transport profit, this paper points out that the establishment of train dispatching plan shall consider comprehensively the influence of passenger demands and passenger volume to ticket income as well as the cost of train configuration and train dispatching to choose the plan with maximum balance benefit

    通過對客運營業利潤指標的主要影響因素進行分析，指出制定列車開行方案要綜合測算旅客需求、客流等對客票收入的影響，以及車輛配置、列車開行的運營支出，選擇差額收益最大的方案。
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