共查询到20条相似文献，搜索用时 15 毫秒
1.
Once,a gentleman was traveling in a train.He felt (1) and got down at a station in search of water.As soon as he reached the water tap[水龙头]the train started.He ran back,but(2) the train.
He asked about the next train and knew that the next train was on the next day.So he decided to find a place to(3)the night.It was getting darker and he could not find a room.He was a little(4). 相似文献
2.
Heat and Cold(热胀冷缩) At a physics(物理)lesson the teacher asks the chil-dren about the effects(效果) of heat and cold on thebody. “Heat makes things bigger and cold makes thingssmaller.”answers a bright(聪明的)boy. 相似文献
3.
Non-equal-interval direct optimizing Verhulst model that x(n) be taken as initial value and its application 总被引：1，自引：0，他引：1
To overcome the deficiencies of the existing Verhulst GM(1,1) model, based on the existing grey theory, a non-equal-interval direct optimum Verhulst GM(1,1) model is built which chooses a modified n-th component x(n) of X(0) as the starting condition of the grey differential model. It optimizes a modified β value and the background value, and takes two times fitting optimization. The new model extends equal intervals to non-equal-intervals and is suitable for general data modelling and estimating parameters... 相似文献
4.
This story concerns(有关)a spider(蜘蛛)and a certain general of ancient times who had lost a battle and,in the company of(在……陪同下)a faithful(忠诚的)servant,was trying to escape(逃脱)from the enemy.Both were extremely(极度,非常)tired,and both were hungry and thirsty,but they did not dare to go into any town for fear of (担心,害怕)being discovered and captured(捉)by the enemy.Toward evening they arrived at a mountain where there was a small cave. 相似文献
5.
A specialised electrochemical measurement cell was plugged into a pilot water distribution system to simulate the pipe inner-wall corrosion. The linear polarisation resistance(LPR) technique and electrochemical impedance spectroscopy(EIS) were measured in real time to study the variation of the corrosion rate(CR) and scale of cast iron. Three corrosion stages were observed according to the LPR analysis: an initial stage with significantly fluctuating CR, a developmental stage with slowly decreasing CR, and a stable stage with a low CR of approximately 0.157 5 mm·a~(-1). The EIS revealed that the scales with a compact outer layer and a porous inner layer finally formed in the stable stage, and the polarisation resistance was approximately 2 175 ?·cm~2. A physicochemical analysis of the scales showed that ferric oxides, oxyhydroxides and calcite made the outer layer compact and effectively limited the diffusion of oxygen through the scales, which resulted in a low CR. 相似文献
6.
Billy was a boy who had a pony(小马)named Blaze that he loved verymuch. Billy and his parents had come West to a ranch(农场) for the sum—mer.They had brought Blaze along. Billy and the pony loved the West and 相似文献
7.
8.
This paper describes the procedure of using the GM (1,1) weighted Markov chain (GMWMC) to forecast the utility water supply, a quantity that usually has significant temporal variability. The GMWMC is formulated into five steps: (1) use GM (1,1) to fit the trend of the data, and obtain the relative error of the fitted values; (2) divide the relative error into ‘state’ data based on pre-set intervals; (3) calibrate the weighted Markov chain model: herein the parameters are the pre-set interval and the step of transition matrix (TM); (4) by using auto-correlation coefficient as the weight, the Markov chain provides the prediction interval. Then the mid-value of the interval is selected as the relative error for the data. Upon combining the data and its relative error, the predicted magnitude in a specific time period is obtained; and, (5) validate the model. Commonly, static intervals are used in both model calibration and validation stages, usually causing large errors. Thus, a dynamic adjustment interval (DAI) is proposed for a better performance. The proposed procedure is described and demonstrated through a case study, which shows that the DAI can usually achieve a better performance than the static interval, and the best TM may exist for certain data. 相似文献
9.
Barcelona 1992 Emblem 巴塞罗那的艺术光芒照亮五环 The official emblem,designed by Josep Maria Trias from Barcelona,depicted a dynamic human figure in a stance that suggested someone jumping an obstacle(which consisted of the five Olympic tings) and the simple, gestual lines reduced the characterisation of the figure to the head (in the blue of the Mediterranean),the grins (the yellow of the sun and wide open in sign of hospitality) and the legs(a vivid red). 相似文献
10.
In order to get a sound casting of the alloy with a solidification range, the principle of directional solidification (DS) and the layer-by-layer solidification(LBLS) should be followed, especially in designing foundry process of steel casting. Using the principles, the reasons for the forming of the defects on the surface of the chain wheels teeth and groove and the forming of MT (magnetic particle testing) thin lines were analyzed. The results of the metallographic observation and the numerical simulation show that the low temperature 相似文献
11.
The quasitriangular structures of biproduct Hopf algebras 总被引：1，自引：0，他引：1
ZHAO Li-hui ZHAO Wen-zheng 《浙江大学学报(A卷英文版)》2007,8(1):149-157
PRELIMINARIES The smash product and the smash coproduct are well known in the context of Hopf algebra (Molnar, 1979; Montgomery, 1993) and remain an active area of study (Zhao et al., 2000; Delvaux, 2004; Zhao and Wang, 2005). Let H be a Hopf algebra over a field k and suppose B is a left H-module algebra and is also a left H-comodule coalgebra. Radford (1985) found necessary and sufficient conditions for the smash product and the smash coproduct on B?H to make it a Hopf algebra, w… 相似文献
12.
A drunk(醉汉)walks into a bar and says to che bartender(酒吧间男招待), “Bartender,buy everyone in the house adrink,pour(倒)yourselfone,and give me the bill(账单).” So,the bartender does just that and hands the man a billfor $57.The drunk says.“I haven’t got it.” The bartender slaps(掌击)the guy around a few timesthen throws him out into the street. The very next day the same drunk walks into the bar and 相似文献
13.
康俊民 《语数外学习(初中版七年级)》2008,(Z1)
(一)Colors Lisa is twenty this year. She works in a clothes store. She has a small red car. One day, she goes home in the car. At a crossing, the engine(发动机)dies and she can't start the car. A lot of cars stop behind her car and the traffic lights(交通灯)turn from red to green, from green to yellow and then red again. Lisa has a look at the cars behind hers and feels very sorry. Then a policeman comes and asks kindly, "Which color do you like, Miss?" 相似文献
14.
《海外英语》2002,(4)
n ancient times, a king had a boulder ( 巨石 ) placed on a roadway. Then he hid himself and watched to see if anyone would remove the huge rock. Some of the kingdom' s wealthiest merchants and courtiers (朝臣) came by and simply walked around it. Many loudly blamed the king for not keeping the road clear, but none did anything about getting the big stone out of the way. Then a peasant came along, carrying a load of vegetables. On approaching the boulder, the peasant laid down his burden and tried to move the stone to the side of the road. After much pushing and straining, he finally succeeded. 相似文献
15.
Heat and Cold (热胀冷缩)
At a physics (物理) lesson the teacher asks the children about the effects (效果) of heat and cold on the body. 相似文献
16.
Objective:To evaluate the accuracy of a scoring system combining zygote and embryo morphology in predicting the outcome of in vitro fertilization(IVF)treatment.Methods:In a study group,117 consecutive IVF or intracytoplasmic sperm injection(ICSI) cycles with embryo transfer were carried out and 312 embryos were scored Using a combmed scoring system(CSS)of zygote and embryo morphology before transplantation.In a control group,a total of 420 IVF or ICSI cycles were carried out and 1176 embryos were scored using a cumulative embryo score(CES).The effects of the combined scoring system on the embryo implantation rate and pregnancy rate per cycle were analyzed.Results:Using the combined scoring system,the embryo implantation rate(27.6%)and the clinical pregnancy rate(48.7%)were significantly higher than those in the control group(20.8%and 38.6%,respectively).Also,the implantation rate of embryos scoring≥70 (38.5%:82 sacs/213 embryos)was significantly higher (P＜0.001)than that of embryos scoring＜70(4%:4 sacs/99 embryos).The pregnancy rate of patients with embryos scoring≥70 using the combined scoring system(66.7%)Was significantly higher(P＜0.001)than that of patients with embryos scoring≥20 using the cumulative embryo score(59.0%).Conclusion:The results suggest that selecting embryos with a high Score(≥70)using the combined scoring system could inerease the implantation rate and pregnancy rate,and that using a scoring system combining assessments of human zygotes and pre-implantation embryos might predict IVF outcomes more accurately than using a cumulafive embryo score. 相似文献
17.
LI Ya-juan WANG Guo-zhao 《浙江大学学报(A卷英文版)》2006,7(6):1084-1087
INTRODUCTION Modification of knots of a B-spline curve changes the shape of the curve. In some recent pub-lications (Juhász and Hoffmann, 2001; 2003; Hoff-mann and Juhász, 2004; Li and Wang, 2005), the authors studied the effect of the alteration of a single knot on the shape of the curve. Hoffmann (2004) and Li & Wang (2006) applied these theories into the constrained shape modification of B-spline and NURBS curves. Juhász (2001) and Hoffmann & Ju-hász (2005) studied the effe… 相似文献
18.
Within the framework of eco-feminist theory,this paper,taking Andrew Marvell’s "To His Coy Mistress" as a specific example,to explain how women and nature are marginalized and reduced to aphasia condition in literature.The paper presents a detailed analysis of the language of the poem,reveals men’s anthropocentric-andocentric attitudes toward nature and women and proposes the decentralization or the relation of "anotherness" as a possible way to reestablish a healthy culture(men)-nature(women) relationship. 相似文献
19.
Rossella Lorenzi 《海外英语》2003,(7)
Bacteria found in a 2.000-year-old piece of cheese couldbe the final evidence that this food was a continuoussource of infectious disease(传染病)in the ancientRoman World.According to a study published in a recent issue of theJournal of Infection,a tiny piece of cheese containing diseasebacteria was carbonized in the volcanic eruption that one nightin late August,79 A.D.covered Pompeii(庞培)and thenearby towns of Herculaneum(赫库兰尼姆)and Stabiae withnine tO 20 feet ofhot ash and pumice(浮石).About 250 people fled to the beach,trying in vain toescape the molten lava(熔岩)and boiling mud pouring downMount VesuviUS.They died from extreme thermal shock(热冲击),wrapped in a 750-degree Fahrenheit cloud.The intenseheat and rapid cooling of the mud has left their bones in aremarkable state of preservation,allowing in-depth medicalStUdies. 相似文献
20.
A new PWM converter based on soft-switching is introduced.The converter uses a minimum number of devices,and requires less switching operations than conventional techniques,Switching is realized solely in a ZVS)zero voltage switching)mode,therefore the loss is reduced and EMI(electromagnetic interference)is suppressed.The paper analyzes the operation of ZVS,and discusses the methods for maintaining a unit power factor and constant DC voltage.Changing the modulation index M and the phase angle θ keeps the input current in phase with the voltage.It also keeps the current sinusoidal,and ensures a constant output voltage. 相似文献