比容偏差 的英文怎麼說
中文拼音 [bǐróngpiānchā]
比容偏差
英文
specific volume anomaly-
Also the theoretical basis of the method have been checked through simple deducing simulation and the influences of various physical parameters on the method have been studied. it is shown that the method is theoretically reliable for the production oil wells without very high production rate and is more suitable in field production for oil wells ( i ) in area with bigger geothermal gradient ; ( ii ) producing fluids ( oil and water ) with distinguish thermal characteristics ; ( iii ) producing oil with lower heat capacity or water with higher heat capacity ; ( iv ) with good surface measurement accuracy, as well as the method h as certain requirements on the accuracy of the temperature and flowmeter logs sensors
就該產出剖面方法的理論基礎進行了簡單的正演模擬和可能影響該方法的各項物理參數進行了全面的考察，結果表明，該方法對于非高產的生產油井來說在理論上是可靠的，在實際生產中適合於（ 1 ） 、油井所在地區地溫梯度較大的油井； （ 2 ） 、油水熱特性差別較大的油井； （ 3 ） 、油比熱容值偏低水比熱容值偏高的油井； （ 4 ） 、井口計量精度較高的油井，並且對井溫測井和流量測井的傳感性精度有一定的要求。With the numerical solution, an internal condensation critical curve can be calculated out by condensation theory and depositing theory, on the curve, the enter water ability equal to the out water ability, which can be used as the basis to determine the occurrence of internal condensation. but the result doesn ’ t coincide with the real completely. in this dissertation, we plan to get the critical curve by practical experiment results, because that the enter water ability only relates to the condensation density and the out water ability only relate to the volume ratio of the pneumatics system
然而由凝結理論和沉積理論得到的計算結果往往與實際有一定偏差，本課題希望通過實驗的方法獲得內部結露臨界線，即系統進水能力和排水能力相等的曲線，由於系統的進水能力和充放氣過程中凝結水滴密度有關，排水能力和系統容積比有關，可以通過大量實驗總結出以凝結水滴密度和容積比表示的內部結露臨界曲線，作為判別內部結露是否發生的依據。Compared with the classical bp algorithm, robust adaptive bp algorithm possesses some advantages as following : ( 1 ) increasing the accuracy of the network training by means of using both the relative and absolute residual to adjust the weight values ; ( 2 ) improve the robustness and the network convergence rate through combining with the robust statistic technique by way of judging the values of the samples " relative residual to establish the energy function so that can suppress the effect on network training because of the samples with high noise disturbances ; ( 3 ) prevent entrapping into the local minima area and obtain the global optimal result owing to setting the learning rate to be the function of the errors and the error gradients when network is trained. the learning rate of the weights update change with the error values of the network adaptively so that can easily get rid of the disadvantage of the classical bp algorithm that is liable to entrap into the local minima areas
與基本bp演算法相比，本文提出的魯棒自適應bp演算法具有以下優點： （ 1 ）與魯棒統計技術相結合，通過訓練樣本相對偏差的大小，確定不同訓練樣本對能量函數的貢獻，來抑制含高噪聲干擾樣本對網路訓練的不良影響，從而增強訓練的魯棒性，提高網路訓練的收斂速度； （ 2 ）採用相對偏差和絕對偏差兩種偏差形式對權值進行調整，提高了網路的訓練精度； （ 3 ）在採用梯度下降演算法對權值進行調整的基礎上，通過將學習速率設為訓練誤差及誤差梯度的特殊函數，使學習速率依賴于網路訓練時誤差瞬時的變化而自適應的改變，從而可以克服基本bp演算法容易陷入局部極小區域的弊端，使訓練過程能夠很快的「跳出」局部極小區域而達到全局最優。School areas are too large and the schoolyards and green spaces are too small ; classroom construction is not up to national standards ; and classrooms contain too many students. furthermore, the school desks and chairs often are not compatible ; and books, instruments and sports equipment are far from enough. there is a gap between software and hardware in the configuration of audio - visual aids ; and the coefficient of the utilization of existing equipment is low and ineffective
通過研究發現，西峰市普通完全中學目前存在著布點不合理，學校規模過大，校園及綠化面積偏小，教室建築規范性差，室內學生容納過量，課桌椅不配套，圖書、儀器、體育器材嚴重不足，電化教學設備軟硬體配置比例失調，現有教學設備利用率低、效益差，學校管理者教學設施建設中作風浮夸等問題。In developing the planar lightwave circuits, the coupling loss between a waveguide with a high refractive index difference and a single mode fiber is considered. a novel spot - size converter based on a y - branch structure is proposed and numerical simulation results indicate that it can reduce the coupling loss effectively with low polarization dependent loss and good fabrication tolerance
在平面波導光器件研製中，提出了高折射率差二氧化硅波導與光纖的新型低損耗連接，與現有波導單側變窄的結構相比較，有效的降低了連接損耗，同時具有偏振相關損耗低，工藝容差性好的優點。The net effect of biases on international comparisons is easily summarized.
偏差對國際比較的基本影響容易概括。Then, this paper empirically tested the validation and predictive accuracy of different var risk management model in the domestic financial market. finally, with the analysis of modem financial risk management development trend and the current domestic financial risk management situation, this paper made a prospect for the application of this model in the construction of domestic financial risk management system. through the analysis, the main conclusions are as follows : ( l ) the traditional mean - variance model is the special example of the portfolio selection based on the var risk management model for the case that the returns of the portfolio are assumed to be normally distributed ; compared with the mean - variance model, the var risk management model is more comprehensive and accurate in the measurement of the portfolio risk, so based on the var model, the investors can allocate the asset more effectively. ( 2 ) the var risk management model can provide the timely and comprehensive risk information for the top risk manager, so it is very helpful to the improvement of total risk management efficiency. ( 3 ) based on the var model, the raroc performance valuation approach can reflect the real performance of the portfolio manager and provide the coherent standard for the allocation of risk limitation and the construction of the incentive compatibility constraint mechanism in the financial instiutions
通過研究分析，本文主要得出如下結論： （ 1 ）傳統的markowitz均值? ?方差模型僅僅是在資產組合收益率正態分佈假設條件下基於var風險管理模型進行資產組合選擇的特例，與均值? ?方差模型中的方差風險度量方法相比， var風險管理模型能夠更全面、更貼切地衡量資產組合的風險，且基於此模型能夠更有效地進行資產配置決策； （ 2 ） var風險管理模型能夠滿足更高層次風險管理者對風險信息的需求，有助於整體風險管理效率的提高； （ 3 ）基於var風險管理模型的raroc績效評價能夠反映資產組合管理人的真實業績，從而為金融機構風險限額的分配和激勵約束機制的制定提供統一的標準； （ 4 ）國內證券市場資產組合收益率服從正態分佈的假設明顯不成立，實證檢驗表明基於資產組合收益率正態分佈假設條件下的方差? ?協方差模型對國內資產組合風險的預測存在較大的偏差，由於文中證明在收益率正態分佈假設條件下基於方差? ?協方差模型進行資產組合選擇的結果等價于markowitz的均值? ?方差模型，因此，均值? ?方差模型對國內資產組合風險的預測同樣會存在著較大的偏差，而半參數var風險管理模型則能夠取得較好的預測衡量效果； （ 5 ） var風險管理模型符合未來金融風險管理的發展趨勢，基於var風險管理模型建立內容提要風險限額內控體系、風險信息披露體系和業績評價體系，並進行金融監管，將有助於國內金融機構內部風險管理方法和外部監管技術跟上國際金融風險管理的發展潮流。The rbf network has a better performance, and better forecasting accuracy. then mathematical model of substation voltage / var control is constructed, the squares minimization of voltage differences as target, also considering requirement of voltage and power balance, taking it into consideration that the magnitude constraint of transformer ratio and compensating capacitor, also that constraint of operation times of one day transformer tap and capacitor switch
因此提高了學習性能，具有較好的預測精度。然後，建立變電站電壓無功控制的數學模型，考慮電壓的調壓要求和無功功率平衡，計及變壓器變比和並聯補償電容的上下限約束，變壓器分接頭和電容器允許的日調節次數的限制，以電壓偏差的平方和最小為目標函數。分享友人