critical constant 中文意思是什麼

Based on the research to the stability variable cross - section beam, the bending defection differential equation of the variable cross - section beam in critical state of bucking is established. according to the edge condition of the structure, the differential equation is solved and bucking equation of variable cross - section beam is created. we can get the algorithm which can be used to calculate the equivalent inertia moment of the variable cross - section lattice structure when it is regarded as constant cross - section of solid web beam

對變截面格構式構件的穩定性計算進行了初步的研究，通過建立變截面構件臨界狀態下彎曲變形的微分方程，根據變形邊界條件，得到了兩端鉸支的變截面梁失穩特徵方程，提出了幾種特殊形式的變截面格構式構件等效為等截面實腹式構件時等效慣性矩的計算方法。

The investigation of this paper has grate actual and expansive significance and offer methods for the application of rigid frame. the investigation indicate that the ripple web plate ' s critical stress has great improvement than ordinary flat plate and ripple web plate variable cross - section has a rather superiority than constant cross - section portal rigid frame

本論文所做的研究工作具有很強的現實意義和推廣意義，為門式剛架的應用提供了思路。通過研究表明：波紋腹板的臨界應力比普通的平板有很大提高，而波紋腹板變截面門式剛架與等截面門式剛架進行對比也有較大的優越性。

The critical concentration and critical particle surface area in constant rate section is studied. the floc density pa and the floc equivalent diameter da are calculated on the basis of experimental data and theoretic analysis

研究了等速段的臨界濃度、臨界顆粒表面積；分析計算了絮團密度_ 、泥沙絮團當量直徑d _ 。

Solution of critical load of continuous strut with constant section

等截面連續受壓直桿臨界荷載的求解

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。

According to the creep mechanism of rock and surrounding rock and the control principle for rock creep, a new critical principle for steady creep of rock was put forward, and an optimum method for calculating the constant resistance supporting of roadway surrounding rock was set up based on experimental studies

摘要根據巖石和圍巖的蠕變機理以及巖石流變控制原則，在實驗研究的基礎上，提出了新的巖石穩定蠕變準則，並建立起一個巖石最優恆阻支護計算方法。

In the research and preparation procedure, it probes into electric field dynamic impedance variation rules, summarizing a set of sparks critical point discrimination methods in solving the key to detect electric field less - spark technology and realizing the less - sparks operation controlling function under impending arcover voltage, putting forward and realizing constant spark rate operation mode, in fiashover treatment adopting method of small descending amplitude, speedy picking up speed, and unlocking silicon controlled rectifier

在研製過程中探索了電場動態阻抗變化規律，總結出一套識別火花臨界點的方法，解決了探測電場少火花的技術關鍵，實現了逼近擊穿電壓下少火花運行控制功能，提出和實現了恆定火花率運行方式，在閃絡處理上採取下降幅度小、回升速度快、不封鎖可控硅的方法。

Due to the change in lattice constant and the distortion of energy band, strained si exhibits great mobility enhancement compared with the conventional si material, and it is the critical reason for the wide application of strained si mosfets

由於晶格常數的改變，應變硅中載流子的遷移率高於普通硅材料，這是應變硅mosfet性能提高的根本原因。

Our calculation shows different behaviors of structure formation in positive - and negative - polarized systems and a critical dielectric constant at which a ground state transition happens is reported

我們發現，由於多極矩效應的影響， er流體中正負偶極矩因子的對稱性將被打破，並進一步地計算了顆粒負極化時體系基態結構發生轉變的臨界值。

In [ 4 ], weinstein skillfully got the best constant in gagliardo - niremberg inequality using the variational approach and therefore obtained the sufficient condition of the global existence of the solution in critical case p = 1 + 4 / n

[ 4 ]巧妙運用變分法獲得gagliardo - nirenberg不等式的最佳常數從而給出了在p = 1 + 4 / n臨界狀態下解整體存在的充分條件。

The result shows that a new kind of flow will be produced instead of the microjet when frequencies exceed a critical value, suppose the characteristic velocity of the micro - actuator remains constant

結果顯示：在作動器出口最大速度一定的情況下，當頻率超過一臨界值后將無法產生微射流，而產生另外一種形態的流動。

In the same time, with the constant improvement and more critical inhabitants " consumption standard, the housing market ' s grown up and the more intensive market competition environment, all these pose a new challenge toward housing developer : they must think much more of the market and customers " needs and need more sufficient information and judgments toward all kinds of changing

同時，居民消費水平的不斷提高、住房消費市場的不斷發育成熟、市場競爭環境的激烈程度不斷加大，對各個房產開發企業提出了新的挑戰：企業要更加重視市場和客戶的需求，對市場的各種變化需要充分的信息支持和準確的市場判斷。