flat space-time 中文意思是什麼
flat space-time
解釋
平直時空-
Abstract : the conformal flat space - time solutions in electromagnetic and scalar theory are shown, and the indefiniteness of the plane - symmetric solutions and the method for defining a noncontinuous field by the intersection of multi - solutions are demonstrated
文摘:給出電磁場和標量場在共形平直時空中的解，發現了平面對稱解的不確定性及由多重解的交集來定義一個非連續場的方法 -
The results show that distinct " bench " distribution rule takes on for the subsidence and distortion of bench - shape slope surface ; the movement range of bench - shape slope surface is smaller but its distortion is larger than those of flat surface and concentrated distortion occurs at every bench plan ; the surface horizontal distortion of bench - shape slope is still pressed in gob centre and tensioned in both sides of gob ; space - time effect should be taken into account for the stability of bench - shape slope influenced by underground mining
結果表明：露天煤礦臺階狀邊坡體的采動沉陷規律表現出很明顯的「臺階」分佈特點；臺階狀邊坡地表的移動范圍比平地地表要小，但變形卻更劇烈，且在各臺階平面處形成變形集中；臺階狀邊坡地表的水平變形仍然呈現出采空區中間受壓，兩端受拉的特點；臺階狀邊坡在地下開采擾動下的穩定性應考慮采空區的時空效應。 -
In this paper, the deposition evolution process in qtx reservoir are studied, the incoming water and sediment, the operation data, and the time and space distribution of longitudinal and lateral sedimentation in reservoir are analyzed in detail, and the longitudinal scouring and sedimentation and lateral deformation law in reservoir tidal flat and mainstream under different operation way are summarized in every operation period
本文以黃河青銅峽水利水電樞紐工程水庫淤積演變過程為研究對象，對青銅峽水庫來水來沙組成、水庫運行資料、水庫縱橫向泥沙淤積時空分佈等進行了較詳細的分析，總結了青銅峽水庫各個運行時期不同運行方式下水庫灘槽縱向沖淤和橫向變形規律。 -
The equilibrium thermal radiation in a flat space - time or a curved space - time behaves like planck black spectrum represented with coordinate quantities. we regard the fact that the radiation from a thermal equilibrium system shows planck black spectrum as a basic physics law, from which it is demonstrated that the transitivity of clock rate synchronization is equivalent to the zeroth law of thermodynamics. the condition of clock rate synchronization is weaker than that constructing simultaneity surfaces. in the space - time satisfying the condition of clock rate synchronization, the zeroth law of thermodynamics is valid. on the other hand, in the space - time where the zeroth law is valid, one can define an identical clock rate
平直或彎曲時空中的平衡熱輻射，表現出用坐標量表示的普朗克黑體譜.把熱平衡系統的輻射具有普朗克黑體譜作為一條基本的物理規律，以此為基礎，論證鐘速同步的傳遞性等價于熱力學第零定律.鐘速同步的條件比建立同時面的條件要弱.滿足這一條件的時空，熱力學第零定律在其中成立.第零定律成立的時空，一定可以定義統一的鐘速 -
The one - loop vacuum polarization is calculated for untwisted and twisted scalar fields in a flat space - time with the topology s1 r3. the effect of vacuum polarization upon photon propagation is considered. it is found that for the untwisted scalar field some photon modes acquire a positive topological mass, thus travelling at a subluminal speed ; but for the twisted scalar field some photon modes get an imaginary topological mass and travel at a superluminal speed
本文中我們首先計算了在拓撲結構為s ~ 1 r ~ 3的非minkowski時空中扭曲標量場和非扭曲標量場的真空極化，然後考慮了真空極化對光子傳播的影響，我們發現除了光子的極化方向和傳播方向都垂直於緊致化方向的情形之外，非扭曲標量場的真空極化使所有其他的光子模式都獲得實的拓撲質量從而導致這些光子以亞光速傳播；但是，扭曲標量場的真空極化使光子獲得虛的拓撲質量以致他們以超光速傳播。 -
This article discusses the actuality and the growing course of home news - magazine via case study, meanwhile, analyses on the markets from audience, advertisement, capital and content, which is based on the frame of marketing journalism theories. after research, we have made some conclusions, standing for the news - magazine : the audience market is full of potential, needing further exploitation ; the advertisement market still has space to develop by enhancing the consciousness and the power of working so as to improve the payoff mode ; the capital market will be full swing, running to logos and mature, therefore, it will be propitious to the developing of news - magazine ; the content market needs to make conformity, establishing special service organization, li ke magazine especial article union, also forms the content - exchange flat by internet, at the same time, consummates related rules for activating content market
本文運用實證研究的方法，對國內新聞類雜志的現狀及發展歷程進行總結和研究，並根據市場新聞學的基本框架，著力對中國新聞類雜志的受眾市場、廣告市場、資本市場和內容市場進行分析：新聞類雜志面臨的受眾市場極具潛力，亟待進一步的開發和培育；它面臨的廣告市場具有較大的發展空間，需要加強廣告經營的意識，並加大經營力度，以改善盈利的模式；新聞類雜志面臨的資本市場將進一步保持活躍並趨向理性，從迷茫中走向成熟，資本的進入有利於新聞雜志的發展和壯大；最後，新聞類雜志的內容市場需要從分散走向整合，建立雜志特稿社等專門的服務機構，利用網路形成內容資源交易平臺，並逐步健全相關的市場規范以激活內容市場。 -
At the same time, a comparison with united states lrfd code, european ec4 code and china gjb rules has progressed. for guiding engineering practice, the paper arranges different thick steel pipe and different strength concrete and draws a conclusion of the best combination. for the subject of house, the paper studies the form of this kind of special combination beam named flat beam for big space
本文根據冷彎薄壁方鋼管混凝土柱的特點，探討了方鋼管各板件全截面有效的條件，同時對研究鋼管混凝土較為詳盡的美國lrfd規范、歐洲ec4規范和我國gjb規程做了對比分析；為指導工程實踐，文章對不同壁厚的鋼管和不同強度的混凝土進行了搭配，進行了性價比的比較；結合多層住宅這樣一個研究對象，為獲得大空間，本文探討了扁梁這種特殊的組合梁形式。 -
Because using ofdm, a frequency - selective fading channel can be transformed into multiple frequency - flat fading sub - channels, in the coding process, spatial diversity ( due to multiple antennas ) is integrated with frequency diversity ( due to delay spread ), therefore, the proposed code can provide higher diversity gain than space - time code alone
該編碼利用正交頻分復用把頻率選擇性衰落通道變換成平衰落通道的特性，同時引入了基於多天線的空間分集和基於時延擴展的頻率分集，比空時編碼具有更高的分集增益。 -
The fourth part considered how to improve system performance by adopting transmission diversity in flat fading channels. in the traditional space - time trellis code design, the space diversity, time diversity and channel code are concerned together to get best space diversity, time diversity and code gain
傳統的空時格碼把空間分集、時間分集和前向糾錯編碼聯合設計，以n摘要獲得最大的空間分集、時間分集、通道編碼的增益。 -
3. finally, through the computer simulations, paper compares ber performance of various space - time detection algorithms for the slow flat rayleigh fading mimo
3 .通過計算機模擬，分析和比較了在平坦慢衰落mimo通道下各種空時檢測演算法的誤碼性能，模擬實驗結果證明了該雙向blast檢測演算法的優良檢測性能和穩定性。 -
Space - time block codes ( stbc ) based on orthogonal design has attracts enough attentions in its applications in mimo - ofdm systems for its full diversity exploiting and low coding / decoding complexity. these applications include not only system performance improvement, but also reduction of the peak to average power ratio in mimo - ofdm systems. under these backgrounds, this paper first studies space - time block codes under the single carrier, flat fading situation, discusses the encoding / decoding principle and its performance under different channels. then, the author focused on the performance of space - time codes under time selective and frequency selective channels, uncovered the fundamental cause of how maximum doppler shift and power delay profile influences the performance of space - time codes through deduction and simulation
在上述背景下，本文以單載波，平坦衰落通道下的空時分組碼為切入點，深入分析了其編譯碼原理和在不同通道情況下的性能;以此為基礎，後文展開了對空時分組碼在多載波，時間選擇性和頻率選擇性衰落通道下的性能研究，通過理論推導和充分的模擬，揭示了空時/頻分組碼在時頻選擇性衰落通道中的性能變化的根本原因;在以上對多載波系統中空時分組碼的研究的過程中，作者發現了空時分組碼在降低系統峰平比方面應用的可行性，提出了一種降低峰平比的新方法。 -
In this part, the two anterior chapters mainly discuss the various basic theories used by the designing for the propagation paths of the electric wave. the theories include the computation methods for the fade and the loss of various propagation paths and obstructions, the engineering estimation methods of the flat fading and frequency selected fading, the designing methods of space diversity and frequency diversity, etc. at the same time, the special designing method of the sea - across path is discussed in detail
本文首先闡述了微波中繼通信工程設計中的相關知識，其中前兩章主要論述了線路設計中所用到的種種理論基礎知識，包括對于各種路徑情況、障礙情況的衰落與損耗的不同計算方法，平衰落與選擇性衰落中斷率的估算方法，天線分集和頻率分集技術的理論知識和設計方法等等。
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