back-to-back devices 中文意思是什麼
back-to-back devices
解釋
背對背裝置-
On the other hand, boundary - scan technique intelligent fault diagnostic method was applied to practice. for most digital system, devices with boundary - scan architecture are broadly used. only using four line or five line to connect pc parallel port with cut tap ( test access port ), all the ptvs can be loaded to cut and all homologous prvs can be taken back to intelligent fault diagnosis system
至於本文採用邊界掃描測試故障診斷技術，是考慮到本系統的通用性和簡潔性，因為對于大多數數字系統而言，具有邊界掃描結構的器件己廣泛應用，本文只需4條或5條信號線就能將pc機和被測邊界掃描電路連接起來，由此極大地簡化了智能故障診斷系統中為實現ptvs加載和prvs獲取而專門設計的介面板電路。 -
Further investigated and analyzed composition structure and flow data that dsa ' s formation of image is systematic at first in this paper, carried on intact summing up to the data in the system, having given out the plan of design of high speed and large capacity data channel of digital formation of image system of x - ray ; deeper discussion of control way on sdram, give solution that many pieces of sdram works togetherses of realizing heavy capacity, designing of heavy capacity deposit board realize storing at a high speed to vision data by frame on the basis of this ; through further investigations of interface of pci bus, optimize back end state machine design and urge procedure making with lower, giving intact pci interface scheme that realize high speed dma data transmission and satisfy request of video transmitting ; further investigate the figure systematic design method of programmable logic devices, due to the difficult point of drifting about of enabled signal in fifo in common use and setting up and keeping of output signal, method has been proposed of improving stability of system making use of signal utilizing the phase locking ring in fpga to offer a lot of clocks to move thus realize coordinating the data between every module of system to transmit at a high speed by making use of fifo
本文首先對數字減影血管造影（ dsa ）成像系統的組成結構和數據流向進行了深入研究和分析，並對系統中的數據流向進行了完整的歸納和總結，給出了x線數字成像系統中的高速大容量數據通道的設計方案；在對sdram的控制方式做了深入探討后，給出了實現大容量多條sdram共同工作的解決方案，在此基礎上設計了大容量幀存板實現對圖象數據進行高速存儲；通過對pci總線介面的深入研究，優化後端狀態機設計和低層驅動程序開發，給出了完整的pci介面方案實現高速dma數據傳輸，完全可以滿足視頻傳輸要求；深入研究了基於大規模可編程器件的數字系統設計方法，針對通用fifo使能信號漂移、輸出數據難于建立和保持等設計難點，提出了利用fpga中的鎖相環提供多個時鐘相移的信號來提高系統穩定性的解決方案，從而實現利用fifo來協調系統各模塊之間的數據高速傳輸。 -
Back - to - back devices
背對背裝置 -
Although a variety of techniques, such as addition of surface area, swirl flow devices, vibration of heated surface, vibration of fluid, are applied to enhance heat transfer, major improvements in heat transfer capabilities have been held back because of the low thermal conductivity of conventional heat transfer fluids
隨著對熱交換設備換熱表面強化傳熱技術研究的深入，換熱工質的傳熱性能已成為影響熱交換設備高效緊湊性能的一個主要因素，低導熱系數的換熱工質已成為研究新一代高效冷卻技術的主要障礙。 -
The paper introduce the usage and importance of the icmp protocol in the tcp / ip protocol stack. it is designed for meeting the needs of working well of network devices in the non - link network system, it provides the mechanism for routers ( hosts ) to send back error messages
本論文試圖說明icmp差錯與控制報文在tcp / ip協議族中的地位和作用，它為了滿足在一個無連接系統中各網路設備協調運行的目的，提供了自治運行路由器（主機）發出錯誤報告或意外情況信息的機制。 -
At present the special protective devices for busbars in middle and low voltage distribution networks are still not common. only appended to original busbar protections, so the faults occurred in middle and low voltage busbars have to be cleared by back - up relaying with long time delay. thus, some kind of faults may spread which originally could be cleared and tremendous economy loss may appear
在電力系統中35kv及以下電壓等級的母線由於沒有穩定問題，一般未裝設專門母線保護，母線故障要由較長延時的后備保護來切除，使不少本可以得到控制的故障被發展和擴大，造成了巨大的經濟損失。 -
According to the application theory of compton back - scattering that the writer had researched, he developed and produced its portable application devices successfully. after the experiment and on - the - spot application, its efficiency is as good as even better than the design indexes. it could be widely used in the areas such as the engineering, the military, the police and the customs
7 .研製成功了具有自主知識產權的便攜式康普頓背散射成像儀，經實驗及現場試用，其性能達到設計目標的要求，該儀器在工程、軍事、公安、海關等領域中有較廣闊的應用前景。 -
3. to keep smooth gain, good vswr, and fewer devices, a feed - back technology is adopted
3 、使用反饋技術，不僅可以獲得平坦的增益和降低輸入輸出的駐波比vswr ，而且也可以使用較少的元器件。
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