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1.
On April 15, 1912, the Titanic, the large ship in the world, struck an iceberg (冰山) of Newfoundland and went down in the early morning darkness, took over 1500 life. The ship was making her first voyage from England to New York when the tragedy occurred. Of the 2223 aboard, only aobut 700 people saved. Millions of dollars of jewelry and furs went down in the ship. The Titanic was thought to be an unsinkable. 相似文献
2.
《Reading and Writing(初中版)》2010,(3)
一The great ship,Titanic(泰坦尼克号),set off(出发) for America in April,1912 on its first trip (旅行).It was carrying more than 2,000 people.TheTitanicwas the largest and finest ship at that time.People thought it 相似文献
3.
In order to find a simple and programmed method to analyze the reliability of hull beams when fatigue and corrosion act on ships, the stress of ships is to be calculated in compliance with the longitudinal bending and cross-section modulus of ship beams. The calculation value of stress is to be compared with the allowable stress in order to gain the actual ship load and margin of safety, and then assess the reliability and failure probability of ship beams. The longitudinal bending moment is a random variable; the fatigue and cauterization are also random variables; and as the ship is influenced by cumulative damage of fatigue and cauterization, the cross-section modulus is a time-varying random variable. The reliability and failure probabilities can be actually reflected through the reliability analysis method. The analysis results indicate that in the service time of ships, as the age of ship increases and the fatigue and corrosion effects accumulate, the reliability of ship beams decreases and the failure probability increases, especially after 15 to 20 years. 相似文献
4.
By using ABAQUS/Explicit, the dynamic process of an offshore wind turbine（OWT） stricken by a ship of 5000DWT in the front direction is simulated. The OWT is located on a large-scale prestressing bucket foundation constructed by an integrated installation technique. According to the simulation results, under the ship collision, a cer-tain range of plastic zone appears within a local area of arc transition structure of the bucket foundation, and the con-crete plastic zone is seriously damaged. As the stress level of OWT tower is relatively low, the OWT tower is less af-fected. A great inertial force is generated at the top of the OWT tower as the mass of nacelle and blades is up to 400 t. The displacement of the tower is in the opposite direction of the ship collision at the end of 1 s under the action of iner-tial force. There is only a minor damage in the ship bow. Most of the kinetic energy is transformed into the plastic dissipation and absorbed by the arc transition structure of bucket foundation. 相似文献
5.
Titanic,the ship of dreams,is also known as Unsinkable,and it was unsinkable on its departure on April 10th,1912。是的,这是一艘奇妙的游轮,这是一个装载最多幸福和最多悲伤的容器,这是一座永远沉睡在海底的安静园地,这是爱情和生命永恒的见证。就如所有极致的美好都容易散去,Titanic没能逃过物极必反的宿命轮回。于是,它载着那么多遗憾长眠于海底。 相似文献
6.
SUN Zhen WANG Junjie 《天津大学学报(英文版)》2006,12(B09):243-247
The head-on collision process between ship and concrete pile supported protective system is simulated by software LS-DYNA. The influences of pile non-linearity and soil non-linearity on impact force, ship crush depth and the cap displacement of pile supported protective system are discussed. It＇s shown that for both severe impact case and non-severe impact case, the non-linearity of pile material influence the impact force history, ship crush depth. The non-linearity of pile material and soil has remarkable influence on the cap displacement especially for severe impact case. These issues should not be ignored in the analysis of pile supported protective system subjected to ship impact. 相似文献
7.
The head-on collision process between ship and concrete pile supported protective system is simulated by software LS-DYNA. The influences of pile non-linearity and soil non-linearity on impact force, ship crush depth and the cap displacement of pile supported protective system are discussed. It's shown that for both severe impact case and non-severe impact case, the non-linearity of pile material influence the impact force history, ship crush depth. The non-linearity of pile material and soil has remarkable influence on the cap displacement especially for severe impact case. These issues should not be ignored in the analysis of pile supported protective system subjected to ship impact. 相似文献
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9.
Throughout the Depression Years. my brothers,sisers and I often heard our Granny say,“One of these days,my ship is coning in.”Of coiurse Grany‘s ship was just a dream——her escape frjon the reality o9f being poor most of her life.But to us it was very real. 相似文献
10.
The discussions about cognition psychology in the field of second language acquisition(SLA) exert great influence on language teaching practice and theoretical research.Interface positions on the role of explicit and implicit knowledge in SLA have led to further exploration by different researchers.This paper,on the basis of previous studies,makes a brief review of the relation ship between implicit and explicit knowledge,focusing on the analysis of interface position and its role in grammar teaching and learning. 相似文献
11.
INTRODUCTION The problem of minimal surface is an old and active problem in the field of differential geometry. The minimal surface has been employed in many areas such as architecture, material science, aviation, ship manufacture, biology, crystallogeny, and so on. The history of minimal surface began with La- grange in 1762 (Nitsche, 1989). Many literature on the minimal surface exist in the last two hundred years (Nitsche, 1989; Osserman, 1986), but few on the minimal surface from the… 相似文献
12.
A giant magnetostrictive material (GMM) model is developed based on the hysteretic nonlinear theory. The Gram-Schmidt regression method is introduced to determine the parameters of the model as well as the relation- ship between the material strain and the strength and frequency of magnetic field in the model. Through comparison, it is shown that this regression method has good performance in significance test. Then the model is applied to study the motion law of a circular plate in classical GMM transducer, which helps control the transducer rapidly and accurately. 相似文献
13.
1 完形填空 A(10 分) It is strange (1)＿＿some stories of monsters begin with little or (2)＿＿ evidence at all. The story of the Kraken is an example. A (3)＿＿ time ago, a man in Norway reported seeing a huge animal (4)＿＿from the sea and pull down a ship with its long arms. It is likely that the ship was (5)＿＿by a sudden storm;but local people believed the story. 相似文献
14.
一"UNGRATEFUL GUEST" Among the soldiers of King Philip there was a poor man who had done brave deeds. He had (1) the king in more ways than one, and so the king put (2) trust in him. One day (3) was on board of a ship at sea (4) a great storm came up. The winds drove the ship upon the (5) , and it was hroken into pieces. The soldier would have died there, (6) it not been for the kind care of a farmer who lived close by. When the soldier was (7) enough to go home, he thanked the farmer for what he had done,and 相似文献
15.
YANTAI: At least 150 passenger‘s and crew aboard a ship on the Yellow Sea were found dead and more than 140 remain missing in one of the country‘ s worst maritime (航海的) accidents on November 24, 1999 near the port city of Yantai in East China‘ s Shandong Province. Rescue workers reported late yesterday that only 36 survivors had been found. 相似文献
16.
Steel fenders are increasingly used for ship-impact resistance structures in the design of navigable bridges. As an important approach to investigating this anti-impact structure effectiveness to reduce influences of vessel impact, simulation analyses are still not perfect yet. So this paper is intended to discuss several issues related to ship collision simulations, including steel constitutive relationship, connections between steel box and pile cap, contacts definition and friction consideration, and the determination of impact waterlines and angles. Consequently based on two examples of ship-steel fender-bridge structure systems, some conclusions about effectiveness and design of fenders to reduce ship impact are drawn. 相似文献
17.
INTRODUCTION 2D irregular-shaped nesting problem is the problem of finding an efficient arrangement for pieces in a containing region without overlapping (Fig.1), and is aimed at maximizing use of material. Nesting problem is of great interest to garment, paper, ship building, and sheet metal industries since small improvement of layout can lead to large savings in material. Many effective solutions have been pro- posed for the case when pieces and containing region are both rectangular. … 相似文献
18.
Calculation method of ship collision force on bridge using artificial neural network 总被引：1，自引：0，他引：1
Ship collision on bridge is a dynamic process featured by high nonlinearity and instantaneity. Calculating ship-bridge collision force typically involves either the use of design-specification-stipulated equivalent static load, or the use of finite element method （FEM） which is more time-consuming and requires supercomputing resources. In this paper, we proposed an alternative approach that combines FEM with artificial neural network （ANN）. The radial basis function neural network （RBFNN） employed for calculating the impact force in consideration of ship-bridge collision mechanics. With ship velocity and mass as the input vectors and ship collision force as the output vector, the neural networks for different network parameters are trained by the learning samples obtained from finite element simulation results. The error analyses of the learning and testing samples show that the proposed RBFNN is accurate enough to calculate ship-bridge collision force. The input-output relationship obtained by the RBFNN is essentially consistent with the typical empirical formulae. Finally, a special toolbox is developed for calculation effi- ciency in application using MATLAB software. 相似文献
19.
Heart of Darkness was written by Joseph Conrad and published as a whole in 1902.The story begins on a British ship"the Nellie"moored on the coast of the Thames.It mainly talks about what Marlow sees and thinks when he begins his journey up to the Congo Riveres and reveals a turning process of a white colonizer called Kurts who is at the very beginning,an idealistic white colonizer trying to bring"civilization"and"progress"to the Africa but in the end falls into a greedy,cruel person.The novel,on the one hand,describes the terrible life of African peple and reveals the tyranne,greed of western colonism and stong racism;and on the other hand,it also shows readers a strong orientalism towards the Africa.So my purpose of the paper is to analyse how Orientalism is revealed in the Heart of Darkness. 相似文献
20.
The siltation induced by wind waves in an entrance channel is one of the prime factors influencing the operation efficiency of a port.It is necessary to predict the siltation accurately for dredging and ship operation passing through the entrance of the port.However,it is difficult to apply the traditional method to predicting entrance siltation because of its complex computational procedure and lacking the data of ocean dynamic elements in the specified sea area.From the view of energy conservation,a direct relationship between wind conditions and sediment deposition can be founded.On the basis of the above methodology,an empirical formula expressed by wind conditions for forecasting the siltation in the entrance channel is set up.The wind conditions are easily obtained from the local meteorological stations or weather maps,so the formula established in this paper is more convenient and practical than the traditional method.A case study is provided,in which the emopirical formula is calibrated and verified utilizing the measured wind and siltation conditions in the entrance channel of the port.Comparisons between computed values and measured data show satisfactory agreement. 相似文献