Suitability of S-Glass/carbon fiber reinforced polymer composite for submarine hull subjected to hydrostatic pressure has been investigated in the present study.Metallic materials have raised concerns owing to their d...Suitability of S-Glass/carbon fiber reinforced polymer composite for submarine hull subjected to hydrostatic pressure has been investigated in the present study.Metallic materials have raised concerns owing to their decomposition due to low resistance towards salinity and hence polymer composites have been explored to showcase their mechanical stability to withstand transverse and impact loads.To this end,the mechanical properties of S-Glass/carbon fiber reinforced polymer composite were experimentally investigated and higher specific strength and stiffness of the composite in comparison to many metallic materials used for submarine hull were reported.The obtained experimental values were used for the static and dynamic crash analysis of the bow,stern and foil through Finite Element Analysis(FEA);where depth of travel was varied from sea surface level of 0-7000 m.Submarine assembly was later developed with the optimum shape and thickness of each part.We also report the nonlinear crash analysis upon impact at velocity ranging from 3 to 21 m/s.Besides,kinetic energy,acceleration peak and internal energy in struck submarine revealed that travel depth 1750 m and 3500 m is recommendable,more particularly,crash safety factor of the submarine is found to be within limit when submarine encounters crash at 1750 m.展开更多
The paper puts forward a method of predicting the calm water total resistance of the high speed displacement ship with transom stern.The hull surface is defined by mathematical function and design parameters.The effec...The paper puts forward a method of predicting the calm water total resistance of the high speed displacement ship with transom stern.The hull surface is defined by mathematical function and design parameters.The effects of design parameters on the total resistance are discussed.展开更多
A tall bearded man, looking severe and worried,sat at the desk in his study, working anxiously. Thelaw of his house was that he must not be disturbedduring the time set apart for his labours. But as hesat so engaged, ...A tall bearded man, looking severe and worried,sat at the desk in his study, working anxiously. Thelaw of his house was that he must not be disturbedduring the time set apart for his labours. But as hesat so engaged, the door opened quietly, and thechubby face of a four-year-old boy peeped solemnlyin. Gravely addressing the tall man, his father, thelittle boy said: 'If you’ll tum out and play wiz展开更多
现代英语中,表示“前往某地”,“到某处去”的若干动词,如bebound,head,leave,make,sail(set sail),set off(out)和start(off,out)等,通常后带for短语,表示方向、目的地。例如: 1.Where are you bound for? 2.…he made out two enemy s...现代英语中,表示“前往某地”,“到某处去”的若干动词,如bebound,head,leave,make,sail(set sail),set off(out)和start(off,out)等,通常后带for短语,表示方向、目的地。例如: 1.Where are you bound for? 2.…he made out two enemy swimmers heading for the raft. 3.We are leaving for Rome next week.展开更多
In this paper, radiative and nonradiative energy transfer from laser dye pyrromethene 567 （PM567） and pyrromethene 580 （PM580） as donors to cresyl violet 670 （CV670） as acceptor in ethanol are investigated by us...In this paper, radiative and nonradiative energy transfer from laser dye pyrromethene 567 （PM567） and pyrromethene 580 （PM580） as donors to cresyl violet 670 （CV670） as acceptor in ethanol are investigated by using the steady-state emission measurement and the second harmonic generation （532 nm, ～ 13 ns） of a Q-switched Nd：YAG laser as the pumping source. The fluorescence intensity of the acceptor is improved due to the introduction of the donors, and the largest enhancement is obtained to be 128% in the PM567：CV670 dye mixture system. Energy transfer parameters, including the radiative and nonradiative energy transfer rate constants （KR and KNR）, critical distance （R0）, and half quenching concentration （[A]1/2） are investigated using the Stern–Volmer plots, and the acceptor concentration dependencies of radiative and nonradiative transfer efficiencies are also obtained. The values of KR for PM567：CV670 and PM580：CV670 systems are 2032.0×109 L·mol-1·s-1 and 2790.4×109 L·mol-1·s-1, respectively, and the values of corresponding KNR are 3.3×109 L·mol-1·s-1 and 4.2×109 L·mol-1·s-1, respectively. The results indicate that the dominant mechanism responsible for the energy transfer in the dye mixture systems is of the radiative type.展开更多
Natsume Sōseki(1867-1916) suffered from cyclic mental depressions through his life, and it was when he was in the state of the most terrible one that he started his career as a writer by writing I Am a Cat(1905-1906)...Natsume Sōseki(1867-1916) suffered from cyclic mental depressions through his life, and it was when he was in the state of the most terrible one that he started his career as a writer by writing I Am a Cat(1905-1906). There are some evidence by his wife and friends that Sōseki's condition of disease dramatically improved during its serialization on a magazine, and the writer himself admited humorously in the preface of other work that it was his depression and mania that enabled him to produce I Am a Cat and other early works. This paper aims at describing the process how his act of narrating had therapeutic effects on his state of mind focusing on the construction of complicitous relationship between an implied author and readers in the work by the unique functions of the first-‘person' narrator: A Cat. Among others, I will consider the influence of Laurence Sterne's Tristram Shandy(1759-1767), which Sōseki introduced to Japan for the first time, by discussing the frequent use of metalepsis that the two works have in common.展开更多
文摘Suitability of S-Glass/carbon fiber reinforced polymer composite for submarine hull subjected to hydrostatic pressure has been investigated in the present study.Metallic materials have raised concerns owing to their decomposition due to low resistance towards salinity and hence polymer composites have been explored to showcase their mechanical stability to withstand transverse and impact loads.To this end,the mechanical properties of S-Glass/carbon fiber reinforced polymer composite were experimentally investigated and higher specific strength and stiffness of the composite in comparison to many metallic materials used for submarine hull were reported.The obtained experimental values were used for the static and dynamic crash analysis of the bow,stern and foil through Finite Element Analysis(FEA);where depth of travel was varied from sea surface level of 0-7000 m.Submarine assembly was later developed with the optimum shape and thickness of each part.We also report the nonlinear crash analysis upon impact at velocity ranging from 3 to 21 m/s.Besides,kinetic energy,acceleration peak and internal energy in struck submarine revealed that travel depth 1750 m and 3500 m is recommendable,more particularly,crash safety factor of the submarine is found to be within limit when submarine encounters crash at 1750 m.
文摘The paper puts forward a method of predicting the calm water total resistance of the high speed displacement ship with transom stern.The hull surface is defined by mathematical function and design parameters.The effects of design parameters on the total resistance are discussed.
文摘A tall bearded man, looking severe and worried,sat at the desk in his study, working anxiously. Thelaw of his house was that he must not be disturbedduring the time set apart for his labours. But as hesat so engaged, the door opened quietly, and thechubby face of a four-year-old boy peeped solemnlyin. Gravely addressing the tall man, his father, thelittle boy said: 'If you’ll tum out and play wiz
文摘现代英语中,表示“前往某地”,“到某处去”的若干动词,如bebound,head,leave,make,sail(set sail),set off(out)和start(off,out)等,通常后带for短语,表示方向、目的地。例如: 1.Where are you bound for? 2.…he made out two enemy swimmers heading for the raft. 3.We are leaving for Rome next week.
基金Project supported by the National Natural Science Foundation of China(Grant No.61275127)
文摘In this paper, radiative and nonradiative energy transfer from laser dye pyrromethene 567 （PM567） and pyrromethene 580 （PM580） as donors to cresyl violet 670 （CV670） as acceptor in ethanol are investigated by using the steady-state emission measurement and the second harmonic generation （532 nm, ～ 13 ns） of a Q-switched Nd：YAG laser as the pumping source. The fluorescence intensity of the acceptor is improved due to the introduction of the donors, and the largest enhancement is obtained to be 128% in the PM567：CV670 dye mixture system. Energy transfer parameters, including the radiative and nonradiative energy transfer rate constants （KR and KNR）, critical distance （R0）, and half quenching concentration （[A]1/2） are investigated using the Stern–Volmer plots, and the acceptor concentration dependencies of radiative and nonradiative transfer efficiencies are also obtained. The values of KR for PM567：CV670 and PM580：CV670 systems are 2032.0×109 L·mol-1·s-1 and 2790.4×109 L·mol-1·s-1, respectively, and the values of corresponding KNR are 3.3×109 L·mol-1·s-1 and 4.2×109 L·mol-1·s-1, respectively. The results indicate that the dominant mechanism responsible for the energy transfer in the dye mixture systems is of the radiative type.
文摘Natsume Sōseki(1867-1916) suffered from cyclic mental depressions through his life, and it was when he was in the state of the most terrible one that he started his career as a writer by writing I Am a Cat(1905-1906). There are some evidence by his wife and friends that Sōseki's condition of disease dramatically improved during its serialization on a magazine, and the writer himself admited humorously in the preface of other work that it was his depression and mania that enabled him to produce I Am a Cat and other early works. This paper aims at describing the process how his act of narrating had therapeutic effects on his state of mind focusing on the construction of complicitous relationship between an implied author and readers in the work by the unique functions of the first-‘person' narrator: A Cat. Among others, I will consider the influence of Laurence Sterne's Tristram Shandy(1759-1767), which Sōseki introduced to Japan for the first time, by discussing the frequent use of metalepsis that the two works have in common.
