立方體狀分子 的英文怎麼說
中文拼音 [lìfāngtǐzhuàngfēnzi]
立方體狀分子
英文
cubelike molecule- 立 : 動1 (站) stand; remain in an erect position 2 (使豎立; 使物件的上端向上) erect; stand; set up...
- 方 : Ⅰ名詞1 (方形; 方體) square 2 [數學] (乘方) involution; power 3 (方向) direction 4 (方面) ...
- 體 : 體構詞成分。
- 狀 : Ⅰ名詞1 (形狀) form; shape 2 (情況) state; condition; situation; circumstances 3 (陳述事件或...
- 分 : 分Ⅰ名詞1. (成分) component 2. (職責和權利的限度) what is within one's duty or rights Ⅱ同 「份」Ⅲ動詞[書面語] (料想) judge
- 子 : 子Ⅰ名詞1 (兒子) son 2 (人的通稱) person 3 (古代特指有學問的男人) ancient title of respect f...
- 立方 : 1. [數學] cube 2. [簡] (立方體) cube3. (立方米) cubic metre; stere
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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。Currently, the army is developping military network based oa project with effort among which military email transferring system is an essential application module. this paper proposed a data model of military email transferring as well as detailed design scheme according to the potential threat in email service system, practical condition of current military network and official model as well as document transferring process. it discussed the security requirement of military email transferring system in detail as well as analyzed and design relevent data model, mail exchange protocol and application requirement of cryptogram management
該文針對電子郵件服務系統中存在的安全隱患,基於對目前國內外電子郵件安全技術的分析研究,立足於現有軍事計算機網路的實際現狀,根據目前軍隊的辦公模式、公文傳輸流程,提出了一種適合於軍隊辦公自動化中軍用電子郵件傳輸的數據模型及具體的設計方案,詳細討論了軍用電子郵件傳輸系統的安全服務需求,對相關的數據模型、郵件交換協議、密碼管理的應用需求等進行了詳細的分析和設計。The content of this paper is arranged as foll owing : chapter 1 introduces the concept of credit, credit risk and credit assessment, as well as the history and development of credit assessment ; chapter 2 introduces the history of ai technology, and the background of expert system and neural network. characters and disadvantages of expert system and neural network are presented respectively and the necessity of combining expert system and neural network is lightened ; chapter 3 shows the process of dealing with sample data, including the treatment of exceptional data and factor analysis, and puts forward the concrete framework of the mixed - expert credit assessment system ; chapter 4 introduces concept of object - oriented technology, and constructs object model and functional model after analyzing the whole system. it also illustrates the implementation of concrete classes by an example of rule class and the inference algorithm in the form of pseudocode ; chapter 5 introduces the structure of the whole system, the major functional models and their interfaces, and the characteristic of the system is also generalized ; chapter 6 summarizes the whole work, and points out the remaining deficiencies as well as the prospective of this method
本文具體內容安排如下:第一章介紹了信用、信用風險、信用評價的概念,回顧了信用評價的歷史、發展和現狀,並綜合各種信用評價模型,指出這些模型各自的優缺點:第二章簡單描述了人工智慧技術,著重介紹有關專家系統與神經網路的基礎知識,通過總結它們的優缺點,指出結合專家系統與神經網路構造混合型專家系統的必要性;本章還介紹了神經網路子模塊的概念,提出了混合型專家系統的一般框架與設計步驟:第三章對樣本數據進行處理,包括異常數據的剔除、因子分析等,提出了信用評價混合型專家系統的具體框架結構,介紹了系統知識庫的主要部分、基於優先級的正向推理機制的流程、以及基於事實的自動解釋機制的具體實現方法;第四章介紹了面向對象技術,進而採用面向對象對信用評價系統進行分析,建立了對象模型和功能模型,並在此基礎上,採用c + +語言以規則類為例說明系統中具體類的實現,用偽代碼的形式描述了推理的演算法;第五章描述了整個系統的結構,對系統主要功能模塊和界面進行了介紹,並總結系統的特點;第六章總結了全文,指出本文所構造系統存在的不足以及對將來的展望。So this paper tries to solve these problems through the following work : first, we select some index to valuate the close - end funds, including income, stability, risk in falling, stocks selecting ability and tuning ability, based on overseas funds valuation methods and domestic market condition ; second, we analyze the stability of all index and form two styles index, which are f and other bad stability index ; then, we form the valuation system, including two - layers index, which are p and factor score ; last, we use this system to analyze the close - end funds which came into existence before 2000 and get the final comparative result. the main intention of this paper is to create the system of valuating close - end funds in our country, which is comprehensive and objective. in my valuation system involving the period from 2000 to 2003, the funds as a whole performs inferior to the stock index
首先,對國外理論界經典成型的、以及前沿的基金評價指標和評價方法進行了詳細的分析,並結合我國的基金市場狀況,選取了可以衡量基金收益、穩定性、下跌風險、股票選擇能力、時機選擇能力等量化指標;其次,根據我國基金分析的需要,採用了諸如基金交易價格、換手率等二級市場表現指標;然後,對這些指標進行了時間延續性分析,檢測這些指標在運用到我國基金市場時能否有效預測基金未來表現,從而形成了兩類指標:時間延續性很好的s _ p和時間延續性不好的其它所有指標;再次,在以上工作的基礎上形成了由兩個層面的指標構成的我國證券投資基金評價體系: s _ p和因子分析中綜合因子得分值;最後,選取了我國2000年1月1日前成立的23隻封閉式基金作為樣本,並同時採用上證a股與深成a股兩個基準組合進行了3年樣本期的實證分析,得出了最終的比較性評價結果。On the basis of the study of the theory and appraise method on land use in the small towns from home and abroad, this paper at first conducts a deep study on the development and role of the small towns, indicating that its development has sawn an uneven development phrase and becomes a carrier of the enterprises, a pool of surplus laborers, a hub of material exchanges between the rural and urban areas, a base of spiritual civilization, an important way to achieve urbanization. second, it conducts a study on the situation and features and the problems the land use, indicating that the efficiency of the land use is low, which has a direct influence on the development of agriculture and the role of the small towns. and the study of the demand of the land indicates the shortage of land is serious, and the small town must rationally use the land and increases its intensive role and the economical efficiency to meet the demand
在分析國內外已有關于小城鎮土地利用的理論與評價方法的基礎上,首先對小城鎮在我國的發展、地位和作用進行了深入的分析,判明我國小城鎮發展經歷了一個曲折向上的發展階段,已成為鄉鎮企業的載體,農村剩餘勞動力的蓄水池,城鄉物資交流的樞紐,農村精神文明的基地,是我國城市化的重要途徑;其次,對小城鎮土地資源利用現狀和特徵進行了探討,並對發展小城鎮建設導致的土地利用問題進行了剖析,表明目前我國大多數小城鎮土地效益和規模效益低下,佔用耕地過多,直接影響農業的發展,影響小城鎮的地位和作用;通過小城鎮土地供需分析研究表明,我國土地短缺十分嚴峻,小城鎮土地需求缺口較大,小城鎮必須合理利用現有土地,增強集約功能和土地經濟效益,從而緩解需求壓力;最後,論文通過運用特爾菲法,描述統計分析法、多元統計分析(主成分分析)法和系統分析法中的層次分析法( ahp )等一系列方法,結合定性和定量兩方面,從土地質量、土地資源數量與結構、土地經濟效益、環境效益、社會效益等五個方面進行分析,篩選、建立了土地資源利用評價指標體系,在因子評價的基礎上,建立了土地利用綜合評價模型,並給出了評價過程和方法。A monte carlo model was developed for simulating the adsorption behaviors of linear macromolecule chains on the solid - liquid interface. the simulations were performed on a simple cubic lattice, which was 50 50 50 sites in size. the concentration profiles of total segments, tails and loops in dilute solutions were used to analyze the influences of simulation parameters ( body concentration, interaction energy between segments, adsorption energy of interface, and macromolecule chain length ) on various adsorption configurations
本文採用montecarlo方法構造了水溶性均聚鏈狀高分子固液界面吸附模型,在50 50 50簡單立方格子上模擬研究了高分子稀溶液中鏈節濃度、鏈尾和鏈環分佈,並結合真實高分子鏈的吸附行為,討論了模擬參數(鏈節間相互作用能、界面吸附能、體相濃度與鏈長)對各種吸附構型分佈、吸附量、表面覆蓋度和附著分數的影響。This text completely and systematically studies the status and the development of the pyrolysis and the fluidization of biomass, which distill the bio - oil in the domestic and international area, as well as the existing problems. this thesis primarily include following aspects : ( l ), by experimenting and measuring the energy ( heat value ) and the content of c, h, n chemical element of right 20 kinds of common biomass, on the base of the experimental result, and respectively established the biomass energy predict experiment formula with the element of h and c is from change, and passed the ro. os examination, which provides the basis and convenience for flash pyrolysis fluidization device energy to convert the rate to compute with biomass energy utilization calculation ; ( 2 ), proceeded the tg and dtg experimentation equal velocity ( 10 ? / min, 20 ? / min, 40 ? / min, 60 ? / min ) heating and constant temperature heating by studying on eight kinds of biomass samples, according to the experimental data and arrhenius formula, we established the dynamics model of pyrolysis of, then, using the goast - redfern and p function, we also solved the dynamics parameters and analyze out every kind of biomass ' s frequency factor and parameters of activation energy, and established the every kind of dynamics model of pyrolysis of biomass, all of these provide the theories and basis to make sure the reactor ' s flash pyrolysis work temperature scope design and the describing of pyrolysis reactor dynamics ; ( 3 ), in order to study and ascertain the process of heat completely getting to pyrolysis time of varied size biomass particles, we observed and measured the ratio of length and diameter ( l / d ) with the varied biomass through electron microscope, we concluded the l / d ratios usually is from 5. 0 to 6. 0, the average is 5. 3 ; ( 4 ), we studied the process of biomass transiting and the theory of complete pyrolysis time with the theory of complicated heat field, we got the time ( t ) of the varied size biomass particles arriving to complete pyrolysis, and we knew that the complete pyrolysis time and the time which get to the biggest production ratio are identical, all of these studies provide the theory base for design and forecasting the flash pyrolysis reactor solid state resort time ; ( 5 ), according to the above experiment result, synthesize to make use of the engineering the mechanics, engineering the material, machine the design to learn the principle, deduce, establish the theory of rotation cone flash pyrolysis reactor material resort time ( t ) and reasonable rotation velocity ( or frequency ) relation theory ; and ( 6 ), we gave the reactor ' s smallest cone angle certain, reactor cone wall strength design theory, the reactor production ability theory, the power design method and the critical rotation velocity theory
本文較全面、系統地綜述了國內外生物質熱解液化制取生物燃油技術研究發展現狀及存在的問題,主要研究內容有: ( 1 )實驗、測定了20種常見生物質的能量(發熱量)和c 、 h 、 n元素含量,根據實驗結果分別建立了以h和c為自變量的生物質能量預測經驗公式,並通過r _ ( 0 . 05 )檢驗;為閃速熱解液化裝置能量轉化率計算和生物質能量利用率計算提供了依據和方便; ( 2 )選擇了8種生物質試樣作了等加熱速率( 10 min 、 20 min 、 40 min 、 60 min )和恆溫加熱的tg和dtg實驗,根據實驗數據和阿倫尼烏斯公式建立了生物質熱解反應動力學微分方程,並採用goast - redfem積分法和p函數對其動力學參數進行了求解,解析出各種生物質的頻率因子和活化能參數,進而建立了各種生物質的熱解動力學模型,為科學確定反應器的閃速熱解工作溫度范圍及熱解反應動力學描述,提供了理論和依據; ( 3 )為研究和確定不同尺度的生物質顆粒中心達到全熱解的時間,在體視顯微鏡下對不同粒度的生物質顆粒的長徑比進行了實驗觀察和測定,得出生物質的長徑比( l d )一般在5 . 0 6 . 0之間,平均為5 . 3的結果; ( 4 )採用復雜溫度場傳熱學理論對生物質傳熱過程及充分熱解時間理論進行了研究,解析推導出了不同尺寸生物質顆粒中心溫度達到充分熱解溫度的時間( t ) ,得出了理論推導的充分熱解時間與最大產油率的熱解時間相一致的結果,為閃速熱解反應器固相滯留時間設計和預測提供了理論依據; ( 5 )根據上述實驗結果,綜合運用工程力學、工程材料、機械設計學原理,推導、建立了轉錐式閃速熱解反應器物料滯留時間( )與轉速(或頻率)合理匹配理論; ( 6 )提出了轉錐式閃速熱解反應器的最小錐角設計、錐壁強度設計、生產能力設計理論和功率計算方法及臨界轉速理論等。In this thesis, the mathematical model of transitional process is built up during salient - pole synchronous motors ( asynchronous starting based on the state equations under d - q frame, simulation model about asynchronous starting using matlab software is set up. it proves the novel exciting winding control way through analyzing and studying the simulation curves, and provides the best exciting in towards polarity way using " stator - electricity " during salient - pole synchronous motors ( asynchronous starting through analyzing the fault of traditional way to exciting
通過分析d q軸系下的凸極同步電動機狀態方程,建立了凸極同步電動機異步起動過渡過程的數學模型。利用matlab模擬軟體建立凸極同步電動機異步起動模擬模型,通過模擬曲線分析、研究,證明本文提出的新型勵磁繞組控制方法的正確性,並通過分析傳統投勵方法的缺陷,提出了"定子電量法"實現凸極同步電動機最佳順極性投勵的方法。Beginning with the analyse of present situation and cause of formation of saline - alkali land, the irrigated area overall water salt trends are analysed, and the irrigated area saline - alkali land and the groundwater level and distribution law of groundwater degree of mineralization are expounded, the trendence of irrigated area saline - alkali land is put forward. then water salt balance model is estanbished according to the relationship of irrigating and drainage. regarding the irrigated area as a balance area, by analysis of mineralization degree of water pumping from the yellow river and drained off water from irrigated area, the change of the draining off water ion is forcasted in water reducing condition
課題研究主要從鹽堿地現狀與成因及灌區總體水鹽動態分析兩方面入手,闡述了灌區鹽堿地、地下水位、地下水礦化度的分佈規律,分析了灌區鹽堿地的成因及變化趨勢;根據灌區灌溉、排水條件與以上各種因素的關系,建立了灌區水鹽均衡模型;把灌區作為一個均衡區,通過對黃河來水礦化度、灌區排水礦化度的分析,預測了在灌溉引水、排水減少時排水離子量的變化;運用灌區水鹽動態模型原理,對灌區現狀( 1998 、 2000年)與規劃水平年總體水鹽平衡進行了計算;總結分析了灌區水鹽動態變化趨勢,計算並提出了排水控制標準。Then according to system simulation technology, the overall air - to - ground attack simulation plan is made with the thought of models and layers. after that, the mathematical models of main parts in the simulation are made such as aircraft body, propulsive system, flight control system, fire control system, bomb and air - to - ground missile. on the basis of these mathematical models, using the object - oriented design methodology, a set of air - to - ground attack real - time visual simulation software is developed. this software can be used to aid aircraft design, research of air - to - ground attack tactics and flight training
本文首先介紹了現代戰爭中空對地攻擊的技術裝備及其特點,計算機模擬技術的發展以及面向對象的軟體設計思想;而後使用系統模擬技術,依據分層、模塊化設計思想,制定了空對地攻擊模擬系統總體設計方案;之後根據目前技術狀況,建立了戰斗機機體、推進系統、飛控系統、火控系統、航空炸彈、空地導彈等子系統數學模型;在此基礎上,利用面向對象的軟體設計思想,在基於pc的平臺上開發了一套對地攻擊視景模擬軟體,實現了戰斗機對地攻擊實時視景模擬。In order to play the whole advantage of supply chain, realize the information sharing, supplement with each other ' s advantages, reach a result of two - wins and set up a steady and healthy cooperative partner and strategic alliance relation, this paper proposes to choice the supplier by combining the actual situation of kunlun machine factory according to the supplier ' s choice standard and method, and then sets up a supplier evaluated indexes system of kunlun machine factory. with the example of the purchase of carbon - forms steel in hai - 2000 productions, the fuzzy - evaluation method is applied in evaluate three supplier of kunlun machine factory, and on the basis of it the encourage measures of different kinds of suppliers is studied. the paper also analyses the influence of e - business to enterprises material purchased and probes into the material purchase strategies under the environment of e - business ; finally, a supply chain integrated performance evaluate index system is designed according to the analyses of supply chain management theory, and two methods of self - evaluated and pole - evaluated are adopted in evaluate the supply chain purchase integrated performance of kunlun machine factory
論文在對采購管理和供應鏈管理理論綜述的基礎上,根據昆侖機械廠采購管理現狀和軍品采購的特點,分析了昆侖機械廠物資采購中存在的問題,研究了昆侖機械廠物資分類采購的策略;為了發揮供應鏈的整體優勢,實現信息共享,優勢互補,達到雙贏效果,建立穩定健康的戰略合作夥伴,按照供應商的選擇標準和方法,結合昆侖機械廠實際對供應商進行選擇,並建立了昆侖機械廠供應商綜合評價的指標體系;以昆侖機械廠的海2000產品中的碳結鋼物資采購為例,運用模糊綜合評價方法對該廠的三家供應商進行了綜合評價,在此基礎上,研究了不同類型的物資供應商的激勵措施;論文分析了電子商務對企業物資采購的影響,探討了昆侖機械廠電子商務環境下的物資采購策略;根據供應鏈管理理論構建了昆侖機械廠物資采購供應鏈,設計了昆侖機械廠供應鏈采購整體績效評價的指標,採用自我評價和標桿評價方法對昆侖機械廠供應鏈采購整體績效進行了評價。In the paper, the engendering and development, business flow and function of logistics distribution are analyzed, that logistics distribution is important link and assurance of realizing e - commerce are analyzed, the problems existed in e - commerce logistics distribution in china is put forward by the actuality of e - commerce logistics distribution in china, and the above study establish the basement of later study. logistics distribution ' s demand to e - commerce, the feature of e - commerce logistics distribution, the way of reducing cost of e - commerce logistics distribution, actuality of the mode of e - commerce logistics distribution in china are analyzed, and the mode of e - commerce logistics distribution in china is put forward ; by selectively studying the theory and method of logistics distribution and studying the principle and method of dividing the group of places, the model logistics distribution allowing visiting repeated of multiple places is established, the model is used to solve rational distribution sequence to reach lest cost to allowing visiting repeatedly, and an actual example is taken. the model logistics distribution in emergency has been established on the base of studying the necessity of logistics distribution in emergency in logistics distribution center
本文分析了物流配送的產生和發展、物流配送的業務流程和功能及物流配送是實現電子商務的重要環節和保證,並結合我國電子商務物流配送現狀,指出了我國電子商務物流配送存在的問題,為進一步研究奠定了基礎;分析了電子商務對物流配送的要求、電子商務物流配送的特徵和降低物流配送成本的途徑,並結合我國電子商務物流配送模式實際,提出了我國電子商務物流配送模式構想;通過對電子商務物流配送理論方法選擇研究,在站點群的劃分原則和方法的基礎上,建立了多站點可以重復訪問的物流配送模型,運用該模型,可以求解合理的配送次序,使可以重復訪問時配送費用最少,並列舉了實例;通過研究緊急情況下物流配送的必要性,建立了緊急情況下的物流配送模型,運用該模型,可以解決配送中心在缺貨的情況下,選擇合理的供貨點及運輸方式的問題,使供貨時間最短、供貨費用最少,並列舉了實例、編制了相應的軟體。Following the development trend of valve cad, according to the requirements of the chengdu chengfeng valve limited company and based on mdt, this article develops the 3d parametric valve design system. the main work and achievements are as follows : based on the 2d engineering drawing of the several different valves the company provided, the 3d parametric basic drawing - base is set up using mdt which is a 3d design platform, including all the parts drawings and the general assemblage drawings of the valve models ; in accordance with the common steps of the valve design, the parameter editors are designed to edit, import and export the valve parameters and are provided with the function of double synchronization on parameters displaying for convenience in use ; in order to meet demands of users and make the design more accurate, reliable and practical, the assistant formula calculators are developed, which can automatically do all types of structure calculation in the procedure of valve design, and export the calculation manual of valve design ; in order to make designers more rivalries, taking full advantage of internetmntranet technology, the virtual design center is developed, which integrate netmeeting, terminal service and super links, so that the designer can directl y use applications on remote server, communicate with other designers on intranet / internet, share software resources and realize long - distance cooperative design
根據閥門cad發展趨勢,針對成都乘風閥門有限責任公司閥門設計現狀,本課題基於mdt三維設計平臺開發了閥門三維參數化設計系統,主要完成的工作和成果如下:根據公司提供的幾種不同結構閥門的二維工程圖紙,利用mdt三維設計平臺建立了三維參數化基本圖形庫,其中包括所有零部件和總裝配模型圖及二維工程圖;依照閥門設計的一般步驟設計了參數編輯器,用來對閥門尺寸參數進行編輯、輸入、輸出等,具有參數雙向同步顯示功能,使用十分靈活方便;根據用戶的需求,為了使設計達到精確、可靠、實用的要求,設計開發了輔助計算器,能自動完成閥門設計過程中所需的各種結構計算,並可以輸出閥門設計計算說明書;為了使設計人員更具有競爭力,本系統利用internet intranet技術設計開發了虛擬設計中心子模塊,虛擬設計中心集成了網路會議、終端服務、超級鏈接等功能,可以讓設計師直接使用服務器上的應用程序,與intranet internet上的其他設計專家進行交流、共享軟體資源,實現遠程協同設計。In order to promote the improvement and development of the equations of state for fluids and meet the different requests in thermodynamic calculation of geological fluids, the author made a systematic study on the theoretical bases of some cubic equations, as well as modifying some cubic equations, developing some virial equations for geological fluids composed of small molecules
為了促進流體狀態方程的改進和發展,同時也為了滿足人們在地質流體熱力學計算方面的多種要求,作者對立方型方程的理論基礎進行了較系統的研究,同時發展了一系列能夠適用於小分子地質流體的維里方程,並改進了文獻中的幾種立方型方程。This thesis first states the characteristics of the equipments that have been adopted by the modern fighter and their basic technical performance. then an overall layered modular design for air combat simulation system is made utilizing system simulation technology and critical sub - systems have been mathematically modeled known as fighter body, propulsive system, flight control system, radar, fire control system, gun, air - air missile and avionics. after that a set of distributed air combat simulation system software is developed based on the scene graphics pc platform
本文首先介紹了現代戰斗機空戰技術裝備及其基本技術性能特點;而後使用系統模擬技術,依據分層模塊化設計思想,制定了空戰模擬系統總體設計方案;之後根據目前技術狀況,建立了戰斗機機體、推進系統、飛控系統、雷達、火控系統、航炮、空空導彈、航電設備等戰斗機關鍵子系統數學模型;在此基礎上,根據總體設計方案,在基於pc的分佈互動式視景模擬平臺上開發了一套分散式空戰模擬系統軟體,實現了戰斗機互動式飛行模擬和分散式空戰模擬。Engineering drawing has always been labeled as a practical subject. a combination of geometrical, building. mechanical and electrical drawing, it relates between theory and the picture of reality. engineering drawing will provide an accurate and complete ptcture for every object tn terms of shapes and sizes. usually, it is taught using the face - to - face teaching mode even in an odl environment. due to its nature, some students may find difficulty in imagining and interpreting the drawings. however, the availability of sophisticated technology provides the opportunity for the learning of engineering drawing to be enhanced via online. a web - based system for teaching and learning engineering drawing was developed based on a constructivism model. the web - based system is tailored for several topics of engineering drawing such as orthographic projection, sectional view, isometric and oblique drawing at the secondary level. the learning strategy consists of multiple phases beginning with introduction, concept learning, engineering drawing method, application and exercises. during introduction, students will be exposed to an overview of the topic followed by learning of specific concepts. the system provides a learning environment that allows engineering students to view objects from different angles, such as third angle projection and first angle projection as well as views of plans, side and front elevations. after learning about the concepts, students wilt be guided through the various steps in drawing methods for each topic via animations and simulations. learners are able to view any section repeatedly. examples of real application of engineering drawings were also given using graphic, animations and video. to evaluate students understanding, exercises were given at the end of each session
工程制圖一直被認為是一門實踐性學科,其整合了幾何學、建築、力學、電子制圖等,從而將理論與現實圖像聯系起來,工程制圖能為每個不同形狀、尺寸的物體提供精確的、完整的圖像.通常,即使在開放與遠程教育環境中,工程制圖的教學也是通過面對面的教學模式來進行的.由於其特殊性,一些學習者可能難以想象並解釋這些圖像.然而,尖端的技術使得可以通過在線的方式加強工程制圖的學習.研究者基於建構主義模式開發了一個面向工程制圖教學和學習的網路系統.該系統適用於幾種工程制圖,例如展開圖、刻面圖、等角圖和斜角圖.學習過程包括導論、概念學習、工程制圖方法,以及應用與練習等階段.在導論階段,系統為學習者提供了專題簡介,然後是概念學習階段.系統所提供的學習環境允許工程專業的學生從三維透視、一維透視、平面圖、側立面、正立面等不同角度來觀察物體.經過概念學習階段后,系統將引導學生通過動畫和模擬學習每個專題中制圖方法的不同步驟,學習者也能重復觀察任何剖面.另外,還通過圖像、動畫和視頻等方式展示真實的工程制圖應用案例.最後,為了評價學生的理解能力,在每部分內容後面都附有相關的練習First, the paper researchs the spice simulation of single electron transistor based on curve approach and quasi - analytical model of single electron transisor, and simulate characteristic of single electon transistor with matlab tool. secondly, the paper combine spice simulation program with master equation of single electron transistor, put forward novel spice simulation method of single electron transistor based on master equation, by choose master state of single electron transistor and build master equation of single electron transistor, afterward gain nonlinear cortrolled source of spice model of single electron transistor by solve the master equation of single electron transistor and simulate v - i characteristic of single electon transistor by spice program, it ’ s result prove the method is availability precision comparing with master equation method
然後在此基礎上提出了基於主方程法單電子晶體管spice模擬新方法,本論文結合當前電路模擬軟體spice程序和單電子晶體管主方程模擬演算法,通過選擇單電子島電子數的主要狀態,建立單電子晶體管主方程,然後求解主方程,求得單電子晶體管spice等效模型的受控源的非線性函數,然後利用集成電路輔助分析軟體spice的abm (模擬行為建模)建立單電子晶體管( set ) spice等效模型,利用set的等效模型對單電子晶體管v - i特性進行模擬,實驗證明此方法與直接解主方程法相比具有一定的精度。From 2005, our country start to put into practice macroscopical adjust, price of crude oil and fibre raw material keep rising, the international trade situation is very grimness, add it turned the productivity of fibre to developped to the 2004 quick in 2001, a current excess, the profession competition turns worse, rate of exchange the influence that change the industry chain at the same time is over and above benefit in fraud that variety ability that a year, turn the fibre profession from here the 2005 the movement difficulty, realize the profits compares to descend 20. 3 % together, is four in the last yearses descend significantly for the very first time, also ising every kind of self - contradict ising convex with problem now, face such disadvantageous exterior environment, how to promote the fast orientation in company oneself new surrounding with the anti - risk ability, exist to the business enterprise with develop to the pass importance
本論文首先對吉林化纖長絲車間生產管理進行系統現狀分析,其主要目的是查找生產管理系統存在的問題,並進行系統原因分析,從而確定系統優化方向。文章從生產計劃管理、生產組織管理、生產控制管理三個方面作了系統現狀分析,逐一闡述車間生產管理各個子系統存在問題有原因分析,在此基礎上運用生產管理系統優化理論,對車間生產管理各個子系統進行了優化研究,提出了系統優化方案。為保證車間生產管理系統優化方案能夠順利實施,筆者提出通過車間自身生產管理制度建設、績效考評系統建立、員工培訓體系建立、生產現場5s管理推行及車間班組建設,為車間生產管理系統優化提供更有力的保障。First the thesis elaborate the basis principles of land sustainable use, according to the natural and social economy situation, the characteristics of the land use, the aids and the principle of evaluation, we work out an index system form four aspects of productivity, protection, viability, acceptability. the weigh of indexes are defined by means of analytic hierarchy process, the standardization of indexes are defined by effective function, then, we use multi - aid decision model which mainly reflects that indictors influence on aim and multi - aid liner function which mainly reflects aim the degree of land sustainable use during 1996 and 1999 in taigu
論文從土地資源可持續利用的基本理論入手,結合太谷縣的自然、社會經濟狀況與土地利用的特點,依據評價的目標和原則,從生產性、資源保護性、經濟可行性、社會可接受性四個方面,採用專家咨詢法建立了太谷縣土地資源可持續利用評價指標體系,採用層次分析法確定了指標權重,應用功效函數法進行評價指標的標準化處理,運用反映評價指標因子對評價目標的影響程度的多目標突變決策模型和反映評價目標的可持續利用程度的多目標線性加權相結合的方法,對太谷縣1996年到1999年的土地利用情況進行了評價。Following is etics visit which analyses the thesis from the angle of investigator. in this piece, i parse whys of the tough system entering school for those children largely at the two sides, census institution in our country and education classified managing system nowadays. what ' s more, i have demonstrated the real problem of floating school and the necessity of reformation, construing the situation about them from the aspect of " entering public school ", which arouses thinking on " fair education " in my mind
哈里斯( marvinharris )提出並系統闡述的「主客位研究方法」 ,在文章的前部分進行主位研究,主要是對文化負荷者,即政府教育行政人員、公立學校校長、打工子弟學校辦學者、學生家長和打工子弟本身的觀點進行描述,以為下文的結論打下基礎;接下來筆者進行了客位研究,即從研究者角度對問題進行分析,主要從我國的戶籍制度、現行的教育分級管理體制方面對打工子弟就學難進行體制原因解析,並論證了打工子弟學校的現實問題及改革的必要性,還從「進入公立學校」這一角度分析了打工子弟的狀況並引發了對「教育公平」問題的思考。分享友人