Toroidal composite vessel winded with fiber is a new kind of structural pressure vessels,which not only has high structure efficiency of compound materials pressure vessel,good security and so on,but also has special ...Toroidal composite vessel winded with fiber is a new kind of structural pressure vessels,which not only has high structure efficiency of compound materials pressure vessel,good security and so on,but also has special shape and the property of u- tilizing toroidal space,and the prospect of the application of toroidal composite vessel winded with fiber is extremely broad.By in- troducing parameters establishment of toroidal vessel and elaborating the principle of filament winding for toroidal vessel,the de- sign model of filament winding machine for toroidal vessel has been introduced,and the design model has been dynamically simu- lated by the software of ADAMS,which will give more referrence for the design of real toroidal vessel twister.展开更多
龙卷风,本文的标题称Twisters,其通常名称是Tornado,是一个在世界各地都可以见到的灾难性天气状况。但是,美国是龙卷风所特别“钟爱”之地。笔者1997年在美国的明尼苏达州就遇到过一次龙卷风,亲眼目睹一辆小汽车被龙卷风吹离地面,像玩...龙卷风,本文的标题称Twisters,其通常名称是Tornado,是一个在世界各地都可以见到的灾难性天气状况。但是,美国是龙卷风所特别“钟爱”之地。笔者1997年在美国的明尼苏达州就遇到过一次龙卷风,亲眼目睹一辆小汽车被龙卷风吹离地面,像玩具汽车一样在空中飞舞,而后重重地摔到了小河里,溅起的水花有几米高。当时飞沙走石,天昏地暗,我趴在地上,紧紧抱住一个消防水龙头,才算躲过一劫！今读此文,余悸犹在。 本文写得很有文采,其文采是如何获得的? 仔细分析,文章成功运用了以下两种修辞: 1/明喻(simile): …where aluminum siding was wrapped like tinsel(金银丝织品)aroundtrees. …Beams were shredded(切碎)like paper and bent like question marksaround trees and shrubs. 2/引用(quotation): “My first thought was,‘Gee I’m out of a job.’”(这是一个工人看见自己的工厂被夷为平地后的心声！) “But in some places it doesn’t really matter because there’s nothing left toplug in,”(这是一名emergency worker对灾后通电的评价) 作为“快餐文化”的网上短文,行文粗拙之处也随处可见。如:It’s like thisthing just cut a swath(本义:收割的刈痕)across a huge area.这句话就很不规范。展开更多
Today is Tuesday。No one says it’s Monday。Jack and May must be not away。Today they can sing and play。May play swhith a black plane。The plane is broken and can’t say。Jack sings on the way。
With the rapid development of digital information technology,images are increasingly used in various fields.To ensure the security of image data,prevent unauthorized tampering and leakage,maintain personal privacy,and...With the rapid development of digital information technology,images are increasingly used in various fields.To ensure the security of image data,prevent unauthorized tampering and leakage,maintain personal privacy,and protect intellectual property rights,this study proposes an innovative color image encryption algorithm.Initially,the Mersenne Twister algorithm is utilized to generate high-quality pseudo-random numbers,establishing a robust basis for subsequent operations.Subsequently,two distinct chaotic systems,the autonomous non-Hamiltonian chaotic system and the tentlogistic-cosine chaotic mapping,are employed to produce chaotic random sequences.These chaotic sequences are used to control the encoding and decoding process of the DNA,effectively scrambling the image pixels.Furthermore,the complexity of the encryption process is enhanced through improved Joseph block scrambling.Thorough experimental verification,research,and analysis,the average value of the information entropy test data reaches as high as 7.999.Additionally,the average value of the number of pixels change rate(NPCR)test data is 99.6101%,which closely approaches the ideal value of 99.6094%.This algorithm not only guarantees image quality but also substantially raises the difficulty of decryption.展开更多
文摘Toroidal composite vessel winded with fiber is a new kind of structural pressure vessels,which not only has high structure efficiency of compound materials pressure vessel,good security and so on,but also has special shape and the property of u- tilizing toroidal space,and the prospect of the application of toroidal composite vessel winded with fiber is extremely broad.By in- troducing parameters establishment of toroidal vessel and elaborating the principle of filament winding for toroidal vessel,the de- sign model of filament winding machine for toroidal vessel has been introduced,and the design model has been dynamically simu- lated by the software of ADAMS,which will give more referrence for the design of real toroidal vessel twister.
文摘龙卷风,本文的标题称Twisters,其通常名称是Tornado,是一个在世界各地都可以见到的灾难性天气状况。但是,美国是龙卷风所特别“钟爱”之地。笔者1997年在美国的明尼苏达州就遇到过一次龙卷风,亲眼目睹一辆小汽车被龙卷风吹离地面,像玩具汽车一样在空中飞舞,而后重重地摔到了小河里,溅起的水花有几米高。当时飞沙走石,天昏地暗,我趴在地上,紧紧抱住一个消防水龙头,才算躲过一劫！今读此文,余悸犹在。 本文写得很有文采,其文采是如何获得的? 仔细分析,文章成功运用了以下两种修辞: 1/明喻(simile): …where aluminum siding was wrapped like tinsel(金银丝织品)aroundtrees. …Beams were shredded(切碎)like paper and bent like question marksaround trees and shrubs. 2/引用(quotation): “My first thought was,‘Gee I’m out of a job.’”(这是一个工人看见自己的工厂被夷为平地后的心声！) “But in some places it doesn’t really matter because there’s nothing left toplug in,”(这是一名emergency worker对灾后通电的评价) 作为“快餐文化”的网上短文,行文粗拙之处也随处可见。如:It’s like thisthing just cut a swath(本义:收割的刈痕)across a huge area.这句话就很不规范。
文摘Today is Tuesday。No one says it’s Monday。Jack and May must be not away。Today they can sing and play。May play swhith a black plane。The plane is broken and can’t say。Jack sings on the way。
基金supported by the Open Fund of Advanced Cryptography and System Security Key Laboratory of Sichuan Province(Grant No.SKLACSS-202208)the Natural Science Foundation of Chongqing(Grant No.CSTB2023NSCQLZX0139)the National Natural Science Foundation of China(Grant No.61772295).
文摘With the rapid development of digital information technology,images are increasingly used in various fields.To ensure the security of image data,prevent unauthorized tampering and leakage,maintain personal privacy,and protect intellectual property rights,this study proposes an innovative color image encryption algorithm.Initially,the Mersenne Twister algorithm is utilized to generate high-quality pseudo-random numbers,establishing a robust basis for subsequent operations.Subsequently,two distinct chaotic systems,the autonomous non-Hamiltonian chaotic system and the tentlogistic-cosine chaotic mapping,are employed to produce chaotic random sequences.These chaotic sequences are used to control the encoding and decoding process of the DNA,effectively scrambling the image pixels.Furthermore,the complexity of the encryption process is enhanced through improved Joseph block scrambling.Thorough experimental verification,research,and analysis,the average value of the information entropy test data reaches as high as 7.999.Additionally,the average value of the number of pixels change rate(NPCR)test data is 99.6101%,which closely approaches the ideal value of 99.6094%.This algorithm not only guarantees image quality but also substantially raises the difficulty of decryption.
