空時收率 的英文怎麼說
中文拼音 [kōngshíshōulǜ]
空時收率
英文
space time yield-
Excellent results have been obtained by using dc magnetron sputtering technology. a solar absorptance of 0. 94 - 0. 96 with an emittance of 0. 04 - 0. 06 at 100 has been achieved
磁控濺射技術的準確結果顯示這種真空管在100時能夠達到吸收率： 0 . 94 - 0 . 96The third part mainly analyzes four risks of house tenancy center and the corresponding managing measures. the part analyzes profit and free - rent period through discussing probability of house in - and - out quantity in profit risk, proposes the risk management measures of cash supervisory mechanism and selectivity financing in capital gap risk, putts forward the measures of liquidity gap forecast, improving credit and adopting different free - rent period in house liquidity risk, and introduces the credit swap to transfer leaseholder default risk
本部分主要分析了房屋置業中心的四個風險，分別是收益風險，通過引入給定時間段內的房屋存貸量的概率分佈分析了房屋置業中心的收益風險和空租期的確定；資金缺口風險，並提出現金監理機制和選擇性融資的風險預防措施；房屋流動風險，提出流動缺口預測、提升自身形象、採用不同空租期的風險管理措施；承租人的支付風險，主要引入了信用掉期合同來轉移這種風險。To investigate the practicability of a solar - direct - pumped fiber laser by using a parabolic dish concentrator, the solar power absorbed by the fiber laser and its absorption efficiency were calculated with numerical method based on the characteristics of solar spectrum in outer space
摘要為了研究拋物面碟形聚光器實現太陽能直接抽運光纖激光器，根據空間太陽光譜分佈特點，採用數值方法，計算了用該聚光器聚集太陽能量抽運雙包層光纖激光器時光纖吸收的太陽能量及其吸收效率。The method of concentrating the decoloration solution of tylosin is usually carried out by thin film vacuum concentration. in this experiment, the concentration process is modified by using the nanofiltration membrane technique which is free from corrosive due to the extractant solvent and in the same time, heating and decomposition of the antibiotic are eliminated, the concentration course ia also distinctly shortened. in this process the small molecule can be filtered by water, and the quality of the product such as, the tyramine content, the solubility of the product, improved significantly. in addition, the membrane filtration process could save consumption of steam and cooling water
泰樂星提煉過程中原工藝脫色液用薄膜真空濃縮，本試驗改進為耐溶媒納濾膜濃縮，料液不需要加熱即可濃縮，防止了料液的高溫分解破壞，濃縮收率明顯提高在濃縮的同時，部分小分子雜質可以隨水分子一起通過納濾膜而除掉，成品質量明顯提高，解決了用原工藝成品酪胺、溶解度不合格的質量問題省去了原工藝濃縮中費用較高的蒸汽、冰鹽水，經濟效益可觀。Main conclusions drawn from the analyses of calculating results are as follows : ( 1 ) the microwave absorption of atmosphere gas have obvious attenuation at the wavelengths for cloud detection, thereinto, the water attenuation effect changes greatly, so the 94ghz cloud detecting radar should have water vapor attenuation correction scheme. ( 2 ) when 37ghz and 94ghz radars detect clouds, the difference between the atmosphere and cloud attenuation and the large variety of radar reflectivity conduce the intension of the radar backscatter signals change. ( 3 ) for the thin cloud layer and low water content of cloud, 37 - ghz radar backscatter signals are not as good as 94 - ghz radar, that is to say that the 94ghz radar has better capability in thin clouds detection
本工作得出如下結論： （ 1 ）大氣氣體的微波吸收在測雲波段產生明顯的衰減，其中水汽衰減效應變化很大；即將上天的空間94ghz測雲雷達必須有水汽衰減訂正方案； （ 2 ） 37ghz和94ghz雷達測雲，由於大氣和雲衰減不同和雷達反射率的很大差異，導致雷達回波信號強弱不同； （ 3 ）對雲層較薄、含水量較少的雲，在不計雷達參數的情況下， 37ghz雷達回波信號不如94ghz測雲雷達，也就是說94ghz對薄雲有更強的探測能力；對雲層較厚、含水量大的雲，由於強衰減的作用， 94ghz雷達回波信號小於37ghz雷達； （ 4 ）從大氣衰減的不利因素方面考慮，空間94ghz雷達測高層薄雲的效果最好；測低層薄雲時需要考慮氣體衰減訂正；因濃厚雲的強衰減作用，探測其中下部的能力大大減弱，不僅要進行衰減訂正，而且要藉助其他信息來反演整個雲層的含水量垂直分佈； （ 5 ）為了獲得從極薄到極濃厚雲的垂直分佈探測能力，未來測雲雷達系統最好採用雙波長甚至三波長（如94 、 37和13ghz ） 。Multiple functions available ： start / crater arc current, increase / decrease time, base / crest value current, pulse frequency, pulse rate, post flow time, hf welding
功能豐富：起始/收弧電流、上升/下降時間、基值電流、峰直電流、脈沖頻率、占空比、滯后關氣時間分別可調，高頻引弧。Multiple funcyions available : start / crater arc current, increase / decrease time, base, crest value current, pulse frequency, pulse rate, post flow time, hf / friction welding, water / gas cooling
功能豐富：起始/收弧電流、上升/下降時間、基值電流、峰值電流、脈沖頻率、占空比、滯后關氣時間分別可調，高頻/接觸引弧、水冷/氣冷可供選用。A new method to estimate doppler centroid and doppler rate applicable to real flight condition is proposed
該方法設置飛機速率和脈沖重復頻率比為常數，保證方位向接收信號均勻空間取樣，使用實時最小二乘擬合演算法。The beacon receiver tester studied in this paper is a part of domestic ground check equipments of the some type airplane that our army imported from abroad. it is a new type of general - service check machine, and it can check if the work of various types of airborne beacon receiver testers is normal fleetly and accurately. thus, not only the operate personnel can be reduced to one person, but also the check time is short, and the check efficiency is high
本課題所研究的軍用信標機檢查儀是我軍從國外進口某型飛機地面檢測設備國產化的一部分，是一種新型的通用信標檢查儀器，它可以快速準確地檢查多種機型的機載信標機是否工作正常，不但操作人員可以減少到一人，而且檢查時間短，檢查效率高，並有很強的通用性，適用於我軍航空兵部隊多種機型的機載信標接收機。Space - time codes can be divided into tree mainly parts : bell layered space - time architecture ( blast ), space - time trellis codes ( sttc ) and space - time block codes ( stbc ). in this paper, we mainly compare the performance of blast and stbc in many aspects, such as design criterion, transmission rate, diversity gain, diversity combining, bit error rate and channel capacity etc. in this paper, we first respectively analysed the instantaneous received symbol energy - to - noise ratio of v _ blast in the diversity combining methods of maximal ratio combining ( mrc ), equal gain combing ( egc ) and selective combing ( sc )
Mimo技術核心是空時編碼（ stc ） 。空時編碼主要分為三種:分層空時碼（ blast ） 、空時格碼（ sttc ）和空時塊碼（ stbc ） 。本文主要對分層空時碼和空時塊碼這兩種編碼方式在設計準則、傳輸速率、分集增益、接收合併、比特差錯率和通道容量等方面進行了較為詳盡的研究。Particles are captured on filter surface ; the frequency of the filter is controlled by a timer. cleaning is done by shaking particles off the filter bag surface, which is enabled by injection of high - pressure air into the funnel. dusts are collected into the barrel underneath for regular removal
來控制清潔濾袋的頻率，清潔方式為把高壓空氣噴入濾袋中，將濾袋表面的粉塵震落至集塵機灰斗內，再收集至灰斗下方的收集桶並定時清除。Abstract : by comparing the channel capacities hetwem orthogonal space - time block coding and multi - antenna array system over rayleigh fading channel, some capacity loss for orthogonal space - time block coding is obtained, which is a function of the code rate, the rank of channel matrix and the number of transmitter and receive antennas, although the system of orthogonal space - time block codes is simple and easy to implemented. if is also shown that there is no capacity loss only if both the code rate and the channel matrix rank are all one
文摘:在研究瑞利衰落條件下正交空時分組編碼通道容量的基礎上，將其與多發送多接收天線系統的通道容量進行了比較.比較結果表明，正交空時分組碼雖編碼簡單，易於實現，但在通道容量方面存在較大的損失，損失的程度與編碼碼率、通道矩陣的秩及收發天線數等因素有關.進一步研究表明只有當編碼碼率和通道矩陣的秩都為1時，才沒有通道容量的損失Section 4 researches on pilot symbol aided space - time 2d rake receiver in rayleigh fading channel. two kinds of 2d - rake receivers are proposed, one is the interference zeros force 2d - rake receiver ( zf - 2drake ). simulation results reveal zf - 2drake has the better performance than the conventional 2d - rake receiver
研究了rayleigh通道下2種導頻輔助的空時2d - rake接收機結構:干擾置零2d - rake接收機（ zf - 2drake ）和基於空時通道估計的時空級聯2d - rake接收機（ spce - 2drake ） ，推導了它們的誤碼率性能。Making use of the time series exhibitions of the fluctuation - rate datum, we make our study for the following two purposes : one is to observe whether the preannouncing companies " temporal - condition variance of the series of the return rate conforms to the demand of sta bility ; the other is to decide whether the preannouncing companies " stocks have asymmetrical - information adjustment, this is to say, to decide how the companies response to good or bad news
為了進一步檢驗盈餘預告新規則實施效果，我們考慮從波動性入手對股票市場的穩定性進行系統分析。我們嘗試利用波動率數值的時間序列表現進行研究，力圖了解：預告公司股票日收益率序列的時變條件方差是否滿足穩定性要求。預告公司股票是否存在信息非對稱性調整現象，即對利好利空消息分別做出何種反應。In the second chapter, a wideband mimo channel model with multiple - tap was integrated according to the angle of departure of the transmitting signal and its spread angle, the angle of arrival of the receiving signal and its spread angle, power azimuth spectra, doppler spectrum and the geometric construction of antenna array both sides of transmit and receive, on the basis of full research on the theories of space - time channel model proposed in the recent literature
第二章在對最近文獻中提出的一些空時通道模型理論進行詳細研究的基礎上，根據發射信號的離開角及其擴展角、接收信號的到達角及其擴展角、功率方位譜、多普勒譜和收發兩端天線的拓撲結構，綜合了一個多抽頭的寬帶mimo通道模型。Space time coding was proposed by combining transmit diversity and coding technology to improve the system performance, such as error bit rate, data rate, and system capacity. in particular, space - time block coding ( stbc ) schemes, proposed originally by alamouti were adopted by the 3g standardization committees as one key technique in 3g wireless systems
將發送分集與編碼調制技術相結合，進一步產生了空時編碼技術，由於空時編碼技術具有優異的抗衰落性能，並且能通過發送分集和接收分集提供高速率、高質量的數據傳輸，因此它已經成為第三代移動通信技術的重要組成部分，並將繼續在下一代移動通信技術的發展中發揮重要作用。Space - time coding technology is based on multi - elements antenna array and has strong points of both time processing and space processing. it can satisfy the requirements of high data rate transmission in the future radio mobile system without the increase of the transmitting power and the spread of the frequency. and it can greatly improve the quality of communication services and system capacity under fading channels
空時編碼技術是一種利用多天線陣發送和接收的技術，該技術能很好地結合時間處理技術和空間處理技術的特點，能在不增大發射功率和不擴展頻帶的前提下滿足未來無線移動通信對高數據率傳輸的要求，從而全面提高衰落通道的通信質量和通信系統容量。Because of the affection of noise and signal fading, in order to high data rate access and high quality, wireless communication need new technology to improve the link reliability and enhance the spectrum efficiency. mimo ( multiple input and multiple output ) can enhance the spectrum efficiency and increase channel capacity greatly, and reduce the multipath affection without spectrum band and power increasing. the 3th generation mobile communication wcdma is coming, with the purpose of putting mimo, stbc ( space time block coding ), space diversity into practice of wcdma systems, in order to lay the foundation of 3g toward 4g, this dissertation has done some research under this background
在發射機和接收機使用多個天線進行數據傳輸的多輸入多輸出（ mimo ）技術，可以在不增加帶寬和天線發送功率的條件下，成倍的提高頻譜利用率，提高系統的通道容量，還可以抗多徑干擾。第三代移動通信wcdma即將到來，為了將多天線技術（ mimo ） ，空間分集技術，空時編碼技術用到wcdma系統中去，為第三代移動通信向第四代移動通信系統平穩過渡奠定一定的基礎，需要做一些理論上的研究。Assuming that the rates of return obey normal distribution, chapter 4 combines the advantages between the mean - var model and the chance - constrained programming model and presents a chance - constrained mean - var portfolio problem with short selling, which is determined by expected rate of return and confidence level
以此可作為投資管理參考的依據，具有一定的實際意義。本文第四章提出了在允許賣空時的機會約束下的均值? var模型，它是以期望收益率與置信水平為導向的。The modal analysis result shows that the vertical and horizontal frequencies of dps undeployed are high enough and suffice the dynamic stiffness requested for launching. but the large spread length and light weight effect the low frequency of dbs deployed, so considerations should be taken to the effects of other systems of the satellite. the static analysis result shows that the displacements of the dbs are small under the joint affect of vertical and horizontal loads, and stresses are low, so the stiffness and intensity are good enough
模態分析結果表明伸桿收攏狀態的軸向和橫向頻率都比較高，可滿足發射升空時的動剛度要求；靜力分析結果表明伸桿結構在衛星處于發射段和上升段時，在軸向和橫向過載聯合作用下變形均較小，剛度足夠；其應力水平亦較低，強度儲備較大。分享友人