本手術的優點 的英文怎麼說

中文拼音 [běnshǒushùdeyōudiǎn]
本手術的優點 英文
advantage of the surgery
  • 本 : i 名詞1 （草木的莖或根）stem or root of plants 2 （事物的根源）foundation; origin; basis 3 （本錢...
  • 手 : Ⅰ名詞1 （人體上肢前端能拿東西的部分） hand 2 （擅長某種技能的人或做某種事的人） a person doing or...
  • 術 : 術名詞1. （技藝; 技術; 學術） art; skill; technique 2. （方法; 策略） method; tactics 3. （姓氏） a surname
  • 的 : 4次方是 The fourth power of 2 is direction
  • 點 : Ⅰ名詞1 （液體的小滴） drop （of liquid） 2 （細小的痕跡） spot; dot; speck 3 （漢字的筆畫「、」）...
  1. In recent years, the water - saving and control irrigation technique of rice has diverted from plot experimental and demonstration to lare scale. and has got remarkable economic and social benefits. amed at the characteristics of this irrigation area, optimal selection for water - saving techniques of rice, deciding the amout of leaching water and irrigation modles, investigating the adaptability of the water - saving and control irrigation technique in saline land. studying the increase in production mechanism of the technique are important to extend the technique, to better and develop saline land as well as slick spots. according to the results of field experiments, optimization study was conducted on the water - saving irrigation technique of rice in saline land, the effects of different water - saving irrigation techniques on the physiological indexes and yield of rice were systematically analyzed. by using mutiplepurpose fuzzy optimization method, better. water - saving irrigation technique was selector out, that is. the control irrigation technique in rice. the mechanism of it was analyzed from the aspect of the physiological and ecological saving water of rice to provide the implemental process and technical point ; throgh the quantitive analysis and comparision on control irrigation and control class ( flood irrigation ), high production and quality mechanism of the technique was analyzed in terms of physiology indexes of rice, the variation of soil moisture, the pest resistance and the lodge resistance, the change of soil temperature in paddy fields. the yield constitutive factors, the quality of rice and so on. in saline land. control irrigation and intermittent leaching modles were adopted to validate the adaptability of the technique in irrigation of rice in saline land, to analyze rice ' s physiological - ecological indexes and the change of soil salt content under the conditions of control irrigation leaching of rice and and to provide control irrigation and combined modle of intermittent leaching to adapt to different conditions

    本文從試驗及試驗資料入手，取得以下主要成果和結論：對鹽堿地水稻節水灌溉技術進行優化研究，系統地分析了不同節水灌溉技術對水稻生理指標及產量的影響，採用了多目標模糊優化的方法，對灌水技術進行綜合評判，優選了節水灌溉技術，論證該地區宜採用水稻控制灌溉技術；闡述控灌技術通過調節和控制水稻的需水規律，降低水稻高產情況下的無效水量消耗，從水稻生理、生態節水兩方面分析了控灌技術節水機理，針對性地總結出水稻各生育期實施節水控灌技術的步驟及技術要點；通過控灌與淹灌的定量對照比較，從根系、莖蘗、冠層葉片及綠葉動態到株高，土壤水分變化，抗病蟲害、抗倒伏能力，稻田土溫變化，產量構成因素及稻米品質等諸多方面進行動態比較，分析控灌技術高產優質機理；在鹽堿稻地採用控制灌溉+間歇淋洗模式，跟蹤測試田間水鹽變化狀況，驗證控制灌溉技術在鹽堿地區水稻灌溉中應用的適應性，通過分析水稻控制灌溉淋洗條件下水稻生理生態指標，提出優化控制灌溉+間歇淋洗組合模式，為進一步在高礦化度地區試驗水稻控灌技術奠定基礎。
  2. The advantages of this modified technique can be stated as follows : ( 1 ) healing was apparently faster. ( 2 ) postoperative pain was minimal. ( 3 ) depth of vestibular fornix was increased markedly. ( 4 ) frenum and muscle attachment pull almost completely relieved. ( 5 ) there was less possibility of exposing a dehiscence or creating bone 1055 on adjacent teeth. ( 6 ) a function - ally adequate zone of attached gingiva was numerically increased

    本改良法的優點，可歸納以下幾點: （ 1 ）手術傷口愈合快（ 2 ）術后疼痛小（ 3 ）口腔前庭寬度明顯增加（ 4 ）頰系常及肌肉的拉扯，幾乎獲得完全改善（ 5 ）不易引起手術區周圍齒槽骨的裂開缺損（ 6 ）固著性齒齦寬度的增加至為明顯。
  3. Nextly, to narrate the emergence, history, current situation and the future of network accounting in the summarize. once more, on the text this paper studies and discusses the fundamental, including network accounting connotation, similarities and differences of network accounting and traditional manual accounting and cais, technology criteria of network and some advantage ; influencing, on trad - itional accounting theory ( mainly focusing on, general principle etc. ), ob - taining and making use of information ; specialty, risk and precautionary, and so on. it puts forward the consult and sug - gestion

    再次，在主體部分圍繞網路會計的基本原理（包括網路會計的內涵、網路會計與傳統手工會計和會計電算化的異同、網路會計系統的技術標準、及其具有的優點） ，網路會計對傳統會計理論的影響（集中在會計的核算前提條件、核算一般原則等方面） ，網路會計下會計信息的獲取與使用，網路會計具有的特殊性及由此產生的風險和防範措施等若干方面進行詳細的研究和探討並闡述個人的基本觀點，從而為網路會計在我國的健康順利發展及為經濟建設服務提供有益的參考和建議。
  4. It is certificated in the engineering practice that this technique not only is economical easy to control and completed, such as the other methods of strut frame, but also break the applicability of common method of strut frame, which assure the wider applicability and foreground of the technique of strut frame made of composed soil nails this paper begins with the concept of the strut frame made of composed soil nails, analyzing the composition, engineering characters and job practice of the technique of strut frame made of composed soil nails

    工程實踐表明，復合土釘支護技術不僅具有土釘支護技術施工快捷、經濟性好和便於信息化管理等諸多優點，而且突破了普通土釘支護技術的限制使用范圍，具有更廣闊的應用領域和前景。本文從復合土釘支護結構的概念入手，對其結構組成、構造形式以及主要構件的工程特性、施工方法進行分析研究。
  5. For more than a hundred years, the method of plastic deformation for measuring pressures has been the main means to test the chamber pressure of conventional weapons because of its advantages of reliability, convenience and low price

    塑性變形測壓法具有工作可靠、使用方便、成本低廉等突出的優點，一百多年來，一直是常規武器膛壓檢驗的主要技術手段。
  6. When the cement concrete pavement is opened to the traffic up to 3 ~ 5 years, especially when the wear resistance of the coarse aggregate is not good and the strength of the concrete pavement is not adequate, the wear in the original road surface will be more distinct in these cases. the phenomena of stripping, pit slot, surface pit, incompact and polish, filler damage and etc. usually happen in the cement concrete pavement. it will influence the traffic quality once the diseases appear in the cement concrete pavement

    本論文結合東北高速黑龍江分公司項目《水泥混凝土路面白色薄層罩面技術的研究》展開工作，通過大量的試驗研究，從以往國內的修復材料，國外的同類材料中，參考道路修復材料的技術標準，路面養護維修手冊和混凝土路面修補技術要求，吸取已有材料的長處和特點，研製開發了kg水性修補材料和kg油性修補材料，通過反復測試並做正交試驗，研製出最優配方。
  7. Based on the analysis of the features, key procedure and research tendency of various algorithms for cutting stock problem, this paper proposes that the increasing of material utility ratio can not be reached by solving cutting stock problem only. a integrated solution should be resolved from both management and application optimization technology in view of system engineering

    通過分析各排樣演算法的特點、關鍵步驟與研究趨勢，本文從系統工程的觀點出發，指出提高材料利用率不僅僅只是一個排樣問題的求解，而是要從下料生產管理和優化技術方法兩個方面同時入手，建立完整的解決方案。
  8. Based on the characteristic of the pavement serviced, the traffic and the maintenance management of the major highwaays in zheng - zhou city, this paper makes up the theony and mothed for pavement service performance makes a systemly analysis and research of item queuing and decision potimum, and puts forward to the way to the pavement maintenance of the major highways with the system analysis theory, the modern information technique and much scientific knowledge on system science, management science, project economy, highway engineering, computer technique and son on, which meet he need of the macromanagement and the major management on the highway maintenance through the theoretical analysis, the maintenance management, the qualitative analysis and the quantitative analysis. after practically used, we have a better conclusion

    本文依據鄭州市干線公路路面使用性能現狀特徵、交通特徵、養護管理特徵，以系統分析原理為指導，現代信息技術為手段，綜合運作系統科學，管理科學、工程經濟、道路工程、計算機技術等多種科學知識，對項目排序和決策優化方法進行了較為系統的分析與研究，面對道路養護宏觀管理與重點管理的要求，通過理論分析與養護管理實際相結合，定性分析與定量分析相結合，建立了路面使用性能評價的理論方法，提出了干線公路路面養護技術對策，經過實際推廣應用，取得了較好的效果。
  9. The mobile communication technology progress has provided the new way for the enterprise information to be transmitted fastly and accuratly. therefore, this article based on the above viewpoint, the paper carry on the conformity with each kind of information system of the enterprise, by using communication timeliness and the mobility, establishes a real - time highly effective, safe, stable, product management system information platform which taking enterprise ' s product as the basic point and the product in the sale also is the supplier and the seller intermediary spot characteristic, through analysis each function of the system skeleton as well as research each function flow, the information determination and the grouping, the data warehouse definition and the optimization, might using migration such as cell phone, computer and so on. to complete the data exchange of the enterprise internal and external forms product information by computer, achieved the goal of promoting the enterprise internal and external forms information transmission, exchange and communication

    因此，本文基於上述的觀點利用通信技術的實時性和移動性，與企業各種信息系統進行整合，建立一個實時高效、安全、穩定的企業產品管理系統信息平臺構架，以企業的產品為基點和產品同時在銷售中又是供應商和銷售商的中介點的特點，通過對系統構架各項功能的分析以及各項功能在模塊中實現的流程、信息的確定與分組、數據倉庫的定義和優化等作了理論的研究，可以利用手機等移動便攜工具、計算機完成進行企業內外部產品信息的數據交流，達到促進了企業內外部信息的及時傳遞、交流和溝通的目的。
  10. Establishing 3 - d terrain models with vector contour lines and elevation terrain models with the help of the determination of space corresponding relations between contour lines, tile operation and branch operation. explanation of real - time reflection of terrain models, including three algorithms in lod technology, compared with quadtree algorithm, roam algorithm and the algorithm based on the intermediate belt, to show the advantages and disadvantages of the different situations of the terrains, so as to find out the right algorithm, the quadtree algorithm. developing and implementing the fast demonstration on the vc platform with three - dimentional visualization techniques, such as vrml and opengl, providing a persuasive argument for the research

    論文首先概括介紹了用等高線快速建立3d地面模型和顯示的相關技術，並論述了課題研究的背景和選題依據;其次，論文闡述了如何對等高線數據進行預處理，提出了有效的得到矢量化等高線的方法;再次用矢量化的等高線數據建立三維地面模型，通過等高線間的對應關系的確定、瓦片操作、分支操作建立地面的高程模型;然後論文對地面模型的實時渲染問題進行了深入闡述，主要是從lod技術的三種演算法著手進行研究，通過對比四叉樹演算法、 roam演算法和基於過渡帶演算法對不同種情況的地面數據顯示的優缺點，再結合本系統的地形數據的特點選擇了適合的演算法:四叉樹演算法;最後，用vrml和基於opengl的三維可視化技術在vc平臺上開發並實現了地形的三維快速顯示系統，為論文的研究內容提供了有力的論證。
  11. Starting with the traditional theory of biologic symbiosis and industry economics, taking the fundamental principles of industrial economics, ecological economics, western economics and game theory, and on the basis of the present situation of the high - tech industrial clusters of each country all over the world, this paper researches into the deep economic roots of industrial symbiosis, mainly analyzes the special mechanism of innovation from the high - tech industrial symbiotic units, and it takes the example of the symbiotic relationship between multinational corporations and domestic hi - tech enterprises, anatomizes different internal and external symbiotic relations of high - tech industry. in addition to all above mentioned, this essay aims to offer gist of the routes choosing of the high - tech industry based on symbiotic theory, and brings forward a series of improving measures to create an better symbiotic environment for high - tech industry

    本文從生物共生理論與傳統產業經濟理論入手，在前人研究的一些有關共生經濟的基本概念和原理的基礎上，通過產業經濟學、生態經濟學、西方經濟學、博弈論等基本理論工具，探究了產業共生現象的深刻經濟根源，重點分析了產業共生體所帶來的特有的創新優勢的機理機制，並以跨國公司與我國高技術企業之間的共生關系為典型案例，剖析了高技術產業不同層次上的共生關系，從高技術本身的共生性，到高技術企業內部的各主體，以及同一產業鏈條上的不同的企業之間和高技術產業與其他產業之間的各種共生關系都是文章所要探討的重點。
  12. If the technicians applied technology in the wrong, even achieving the business logic, but probably leading to many vices including low performance, low scalability, close coupling, low software duplication. so how to assemble the j2ee technology reasonable and achieve a system with high performance and high expansibility is my research emphasis in the thesis. in order to solve the problems and implement efficient web application, the paper put forward ejs _ mvc model according mvc pattern and we can assemble component by using ejs _ mvc model, it can solve many problems of web application and improving system with clear flow and clear function partition, in addition, due to controller is the most importance in the ejs _ mvc model, so the thesis also discuss some problems about controller design ; if the model is not designed accurately, system performance will encounter fatal influence, so the article lucubrate ejb technology from ejb choice, ejb optimized design, database access, design pattern etc and bring forward some strategies and methods about how to build efficient business tier ; finally based on ejs _ mvc model, a example that contains simple business logic is developed according to the object - orient software engineering thinking and some strategies and methods proposed by the thesis, in the process of achieving system function, the emphasis is probing into how t o assemble and apply technology reasonable and providing a new thinking thread and method contributing to build high effective and flexible j2ee application

    由於j2eeweb應用是由組件組成，因此為了解決上述問題，實現高效的應用，本文首先從如何合理組合組件入手，找到一種方法使各組件能具體分工而又緊密合作，在深入研究各組件基礎上，根據mvc模提出了ejs _ mvc模型概念，指出可按此模型組合各層組件，該模型可以解決傳統web開發中存在的問題，而且具有系統流程與系統功能劃分清晰，可擴展性、可維護性強等優點，另外由於控制器是ejsmvc模型的重中之重，它起到承上啟下的作用，它設計好壞直接關繫到整個應用的性能、伸縮性與擴展性，因此又探討了控制器設計的有關問題；另外如果模型設計不當的話，對系統性能造成的影響可能是致命的，因此本文又從ejb組件選擇、 ejb調優設計、數據庫訪問和設計模式等方面對ejb技術作了全面的分析研究，指出在業務層中如何避免太多網路遠程調用和提高業務層性能，特別是根據前面的分析總結出了業務層的優化分層組合模型，這個模型的使用無疑會使業務層具有較高的性能與伸縮性；最後選擇一個業務邏輯較簡單的系統，使注意力集中到運用的j2ee技術上來，按照ejs _ mvc模型與軟體工程流程以及本論文所提出的方法與策略實現業務邏輯，在實現過程中具體探討如何合理運用組合技術，就多層j2ee體系結構的設計思想作深入的探討實踐，為實現高效、靈活的多層j2ee應用提供一種新的思路及方法。
  13. It can also determine the fault spot and reason. this technology has been used in some technological fields and proved efficient. it has promoted the revolution of maintance system and the historial protection is replaced by preventive maintenance. with this technology, we can improve the reliability of machine and decrease the maintance fee. recently, reserch has pick up a fervent pace in the area of fault diagnosis of electrical machines. the paper simply analyzes the fault reason of electrical machines, stressly describes and explores the methods of condition monitoring and fault diagnosis such as partial discharge, stator current, rotating speed, vibration etc. fault prognosis is now include diagnostic feature, reason, spot. prodigious improvement in signal processing hardware and software has made this possible. primarily, these techniques depend on locating specific harmonic components of the fault. these harmonic components are usually diffirent for diffirent types of faults. automated tools such as fuzzy logic based system is also simply presented in the paper

    本文從絕緣結構的故障機理入手，以絕緣結構故障的典型特徵? ?局部放電為研究對象，重點討論局部放電的在線監測方法、適用場合併比較它們的優缺點；在分析籠型異步電機轉子斷條在線監測的定子電流監測方法后，根據其缺陷，本文探討了溫升不平衡法、希爾伯特變換數字濾波、小波包分析法的原理及優點；以電機軸承、氣隙偏心等故障為研究對象，通過對電機振動和轉速頻率的檢測，診斷電機的故障類型；本文的重點工作是將人工智慧技術中的模糊技術應用於電機的狀態監測和故障診斷中，力求使電機故障診斷更接近人工智慧化；最後，本文對電機狀態監測和故障診斷系統進行了硬體和軟體初步設計，為實現預測維修提供了有效的技術手段。
  14. The research results is briefed as follow. ( 1 ) a new communication and decision - making method is presented, which integrated several new tools as well as some old ones ; ( 2 ) a new concept of " virtual communicating place shared in real time by multi - user " is brought forward, and a new technology based on event - driving and message - transferring mechanism is designed to realize graphic data shared by multi - user and displayed synchronously under net environment, which is the basis of the whole system. ( 3 ) a new mechanism for team members to share data efficiently is devised, which supports collaborative working in progress, maintains the consistency of data, records the history of design and etc. by defining a new type of the design data attributes and the privilege of team member to access to data in different time, using a new method of data manipulating, the team data sharing is realized

    本文的主要研究成果為： （ 1 ）在研究國內外網路決策交流方式方法的基礎上，綜合多種方法的優點，提出了一種新的決策交流方式，採用了多種手段和工具，完善了網路決策交流的機制； （ 2 ）提出了多用戶共享的可視化虛擬交流空間的概念，並對其實現技術進行仔細的分析，針對目前存在的技術難點，提出了可行的解決方案，設計了一種新型的基於事件驅動和消息傳遞機制的多用戶實時共享圖形數據的解決方案，並採用了跨平臺的java技術實現了網路環境下圖形數據的實時交流和顯示； （ 3 ）針對團隊協同的網路cad系統的特點和要求，提出了一種新的團隊數據共享機制，通過對產品數據的基本屬性、歷史屬性、共享狀態屬性和關聯屬性的定義，結合對團隊成員在不同設計階段的權限控制，採用新型的對共享數據庫的數據操作方法，動態地維護團隊數據的共享、設計的變更、設計進程的同步、關連數據的一致性、以及多個團隊之間的數據交流。
  15. This paper based on the study of present situations in remote education all over the world, combine teaching formulas with distributed technology, and assay the limits of traditional c / s pattern, then it discuss the features of technology in multi - level distributed structure, build a teaching web based on microsoft tools, wield the specialties of xml. achieve the system of remote education in software engineering, it use the advantage of remote education in teaching in most degree, gives a kind of teaching means in effect, instructs student to think actually, and improves students interest in learning

    本文在對國內外遠程教育現狀調查研究的基礎上，將分散式應用技術與現代遠程教育中的教學模式相結合，在對傳統的c s模式的局限性進行分析后，研究討論了多層分散式結構的特點，以微軟平臺為支撐，分析設計和實現了一個基於xml的現代遠程教育課件系統? ?軟體工程教學課件。該課件充分發揮遠程教育在教學上的優勢，提供了一種有效的教學手段，引導學生主動思考；提高學生的學習興趣。
  16. The empirical research in em forthers the acaden1ic thoughts of accrual - basis accounting, hastens the development of generally accepted accounting principles, and enriches the research measures in empirical accounting lots of literatures on em have been reported rece11tly however, researcheres have n ' t reached the consensus in most issues in this fieid much of the controversy over the interpretation of the literature ' s tindings is due to the extensive use of aggregate accruals models that mostly origil1ated from jones mode1 given the limlted theory, we have of how accruals behave in the absence of discretion, the task of identifying and controlling for potentially correlated o111itted variables is daunting indeed an alternative to study aggregate accruals is the 111ethodology for identifying earnings management developed by burgstahler and dichev ( l997 ) based on the distribution of earnings after management however, this measure is flawed by its silence about the form and extent of earnings management my dissertation intends to bridge the traditional aggregate accruals models and the new earnings distribution method, which is the first aim of this paper there is no doubt that earnings management is more rampant in china when compared with what has been documented for the west, since china ' s accounting standards are much too incomplete to of lbr clear guida11ce on many accounting transactions

    文章首先指出了研究盈餘管理的三種方法各自的優點及不足，然後創造性地發展了前人的研究手段，在傳統的瓊斯模型及新的盈餘分佈方法之間找到了溝通的橋梁，並建立了一個嶄新的模型：瓊斯?閾值模型。通過對美國18 ， 160家上市公司在1980 - 1999的20年間的40餘萬觀測樣本的實證研究表明，美國上市公司與我國上市公司一樣也存在著以獲取正盈餘及維持近期業績為目的的盈餘管理；公司經理人員使用可操縱性應計利潤為其管理盈餘的手段；經理人員因追求正盈餘或試圖維持近期業績而管理盈餘時體現出不同的行為方式。對美國上市公司的成功運用，證明我們的新模型在判斷盈餘管理存在與否、手段如何、動機怎樣等方面均比目前正在學術界流行的盈餘分佈法具有更強的檢測能力。
  17. This subject uses the genetic engineering technology and the newest modern biotechnology to study the genetic engineering lower reaches stage, in order to research and establish the optimum, high density fermentation technology pattern and high efficient isolation and purification model of recombinant proteins from inclusion bodies

    本課題利用基因工程技術，重點從基因工程下游階段著手研究，利用最新現代生物技術研究並建立經優化的高密度發酵工藝模式及高效分離純化包涵體重組蛋白模式。一
  18. With regard to the content design of chemistry curriculum and instruction, the author points out that designers must concern about the history of chemistry, its locality in the whole science system and its substantial connections with other science subjects ; we must give prominence to the importance of chemical experimentation as a basic way of understanding chemistry and put an end to the situation that chemical experimentation is often neglected regarded as a tool in traditional chemistry instruction ; we must pay attention to the unity of scientific and humanistic spirits in chemical education, and take the advantage of it to facilitate learner ' s chemistry learning ; chemistry teachers must improve their professional qualities and should become instructional designers and learners

    這些主題也是我國化學課程與教學改革的著手點。筆者指出，在化學課程及教學內容設計上必須關注化學科學的發展歷史及其在整個科學中的地位和跟其他科學之間的本質聯系，突出化學實驗作為理解化學的基本方式的重要性，要徹底改變以往只把化學實驗當作工具而經常將其取而代之的狀況，在化學教育中強調科學精神與人文精神的統一，利用信息技術優勢促進學習者的化學學習，同時，化學教師要努力提高自己的專業素養，成為教學設計者和學習者。
  19. Analyze and estimate the development of mobile communication industry. then we analyze the success experience of ntt docomo ' s i - mode, the failure teaches of wap promotion in europe, the - competition situation and the advantage & weakness of china mobile group, the character and development situation of china mobile group ' s data services : s ms & gprs. according to market subdivision & orientation, business operation mode, product price - making, product development, business innovation and strategic orientation of the company, we bring up six strategies that china mobile group should take in mobile data service development at present, that is, absorb icp in all aspects and develop different and creative applications & contents fast, establish the object market as soon as possible and provide services according to the demand of different market, make & apply the key technical standards and bring up technical demand to cell phone manufacturers & the other cooperation colleagues, quicken the construction of gprs network & data platform, dominate & promote the development of global mobile business by entering an alliance with the leading enterprises in the world, promote the reorganization of mobile data service section to insure the successful practice of related strategies

    本文首先對中國目前的通信行業的演變歷程進行回顧和分析，特別對移動通信行業的發展進行了全面的分析和預測，通過對nttdocomoi - mode成功經驗及歐洲wap推廣失敗教訓的剖析，結合中國移動通信集團公司當前面臨的競爭態勢以及自身的優勢和弱點，並針對中國移動通信集團公司兩大移動數據業務sms和gprs的特點和發展現狀，從市場細分定位、商業運營模式、產品定價、產品開發、業務創新、運營商的戰略定位等方面，提出了近期中國移動通信集團公司在發展移動數據業務時應採取的六大應對策略，即：廣泛吸納icp ，大力開發豐富多彩、有創意的應用和內容；盡快確定目標市場，提供針對細分市場需求的服務；加快制定並實施關鍵技術標準，對手機製造商和其他合作夥伴提出技術要求；加速gprs網路及數據平臺建設；通過與全球領先的企業建立合作聯盟，主導並推動全球移動業務的發展；推進數據業務部門的組織重組，確保相關戰略的成功實施。
  20. The hexagonal barexfe, 2. xo, ( re denote la ^ nd > sm and gd ) ultrafine powders with m - type structure were firstly synthesized by a novel technique - - - - - - sol - gel combustion synthesis method which combines sol - gel method with low temperature combustion synthesis method. based on theoretical analysis and experimental study, the effects of the composition of the gel, the different kinds of intermediate, strength of solution, the amount of complexing agent, the different kinds of anions, the adding of dispersant, auto - propagating combustion and the condition in heat treatment of the gel on crystal phase, particle size, morphology and magnetic properties of bare ^ fe ^ o, ultrafine powders were firstly investigated systematically to clarify the optimum forming conditions

    本研究是在前人工作的基礎上，同時從制備方法和摻雜元素兩方面著手，以保證制備的粉體材料具有優異的性能，即首次利用溶膠?凝膠濕化學合成法和低溫燃燒合成法相結合的一種兼具二者優點的超細粉末新型合成技術? ?溶膠-凝膠燃燒合成法來完成稀土元素摻雜鋇鐵氧體bare _ xfe _ （ 12 - x ） o _ （ 19 ） （ re為la 、 nd 、 sm 、 gd ）超細粉末的制備。
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