Concretely, on the basis of describing the communication specification of arinc 429 with enhanced parallel port ( epp ), the standard and the module application of dsp and cpld, the thesis has proposed the design of the arinc 429 technology based on dsp system. at first, the function and the application of each module of the system and the operation principle of high - performance cmos bus interface circuit hs - 3282 chip which forms the main body of the data diversion of the interface module are introduced. secondly, the hardware structure of the interface module is described in detail, mainly including data latch and buffer circuit, choice circuit of transmission rate, etc. and then the design philosophy and flow charts of the software are fully discussed, such as the basic requirement of software, the design and realization of the function
本文在簡單的論述了pc並口協議( epp )與dsp之間的通信方法、 cpld模塊邏輯控制應用和arinc429的通訊規范的基礎上,給出了基於dsp的arinc429通訊
介面的設計方案:對通訊板中各模塊的功能和應用以及構成數據轉換主體的總線
介面晶元hs - 3282的工作原理做了說
明;
介紹了本設計所用的dsp和cpld的功能概況;詳細敘述了通訊板
介面模塊的硬體結構設計,其中,對數據緩沖電路、數據傳輸速率選擇電路、邏輯控制電路等各關鍵點做了重點
介紹;具體闡述了軟體設計思想及流程圖,包括軟體的基本要求和功能的設計與實現;接著從埠譯碼單元、 i / o通道、電平轉換電路等方面進行了
介面模塊的軟、硬體調試;最後,給出了測試結果,對研製工作做了總結,對本設計的優缺點各做了評述。
The worm - like mesoporous materials were synthesized and characterized with tem, x - ray diffraction, nitrogen adsorption / desorption and ft - ir techniques, etc. the results showed that all the samples had larger porediameter than the samples through calcinations under resembled conditions, but the mesopore ordered poorly. ft - ir results showed hexagonal structural character were kept, but xrd, tem results showed that the samples have the structure characteristics of msu - x. it was analysized that all n2 adsorption isotherms of the samples belong to langmuir iv category which is related to mesoporous materials
Ft - ir光譜表徵結果顯示,經萃取處理后的
介孔sio _ 2材料保持了六方的結構特徵;經xrd 、 tem進一步分析,證實所合成的
介孔氧化硅材料具有msu - x材料的結構特徵, xrd譜圖表
明樣品具有短程有序性:所合成的材料低溫n _ 2吸附測試結果表
明,各樣品的n _ 2吸附等溫線均與中孔(
介孔)特徵的第類曲線基本相符;由kelvin公式計算得到的孔徑分佈曲線說
明,
介孔材料具有較為集中的孔徑分佈;各樣品的bet比表面積比較高。
Ft - ir, xrd results showed hexagonal structural character were kept, xrd and tem results showed that the samples have the well ordered degree. it was analysized that all n2 adsorption isotherms of the samples belong to langmuir iv category which is related to mesoporous materials. the samples had uniform mesoporous distribution and high surface areas
Ft - ir 、 xrd分析顯示,萃取處理方法得到的
介孔材料保持了六方周期性排列的結構特徵, xrd衍射峰較窄,說
明介孔具有長程有序性,同時tem照片也表
明了
介孔氧化硅材料具有長程有序的結構特徵。
Urban chinese medical insomnia ming shi, deputy director of collaborating centres, many of the students from there have been no previous sleep disorder, insomnia the main reason for this is a holiday indulgence of life too, some students also play games late at night, watching television, the biological damage rhythm, would like to sleep when it also took the how
市中醫失眠癥醫療協作中心副主任施
明介紹,不少學生以前從沒有發生過睡眠障礙,此次失眠的主要原因是假期生活過于放縱,有些學生深夜還在玩游戲、看電視,破壞了生物節律,想睡覺的時候卻怎麼也睡不著了。
Experiment research on femtosecond - laser - induced optical micro - cavity in transparent materials
飛秒激光在透
明介質中誘導光學微腔的實驗研究
The thesis, firstly, introduces the feature of embedded system and common component models, and the reasons why common component models cannot be easily applied to embedded systems development
文中首先對嵌入式系統軟體的特點進行說
明,
介紹當前通用的組件模型com dcom 、 corba 、 javabean ejb ,指出通用組件模型不能直接應用於嵌入式軟體開發中的原因。
A control system based on mcs - 51 single - machine is designed to match the characteristics of the tilting control system of the tilting train. in this paper, the development of the tilting train is presented and the principle of it is described. the function and principle of all components of the tilting control system, such as detection subsystem, dictation subsystem, communication subsystem and tilting control subsystem are illustrated in the paper
論文首先
介紹了國外擺式列車的發展概況以及我國擺式列車發展的模式,對擺式列車的工作原理進行了說
明,
介紹了傾擺控制系統的各組成部分? ?檢測子系統、指令子系統、通信子系統以及傾擺作動子系統的功能及原理,提出了基於mcs - 51系列單片機的擺式列車傾擺作動子系統的設計方案。
Cyclic voltammetry ( cv ) and charge - discharge analysis also indicated that the full sei film formed on the surface of the mesocarbon microbead ( mcmb ) anode material in the first cycle
循環伏安和充放電研究進一步表
明,
介穩相石墨碳微球負極材料表面在首次充放電過程中就形成了完整的sei膜。
The result of the study has shown that the strength of the medium under high stress conditions is increased with the result that the specific charge would be raised
研究表
明,
介質在高應力條件下其強度有所增大,因此爆破時應適當增加炸藥單耗。
It ' s essential that any forecasting, used as part of combination forecasting, must cointegrate with the outcome. otherwise, the precision of the combination forecasting model is unpredictable
文中對各種預測方法和數據預處理技術進行了說明,介紹了軟體包的總體設計方案和功能。