Weft knitted fancy fabrics are widely used in knitted garment design. Due to the complexity of the structures, their modeling and simulation needs to be solved in three-dimensional (3D) CAD developments. In this paper...Weft knitted fancy fabrics are widely used in knitted garment design. Due to the complexity of the structures, their modeling and simulation needs to be solved in three-dimensional (3D) CAD developments. In this paper, 3D loop geometrical models of weft knitted fancy structures, including tuck stitch, jacquard stitch, transfer stitch and fleecy stitch, were developed based on an improved model of plain loop, and their central axes as some 3D space curves were achieved by using Non-Uniform Rational B-Splines (NURBS). The 3D visual simulation programme was written in C++ programming language using OpenGL, which was a function library of 3D graphics. Some examples of weft knitted fancy fabrics were generated and practical application of 3D simulation was discussed.展开更多
In this paper, a successfully studied and developed master - slave muld - microcomputers control system based on PC - BUS for hollow spindle fancy yarn spinning machine, mainly Its overall scheme, software and hardwar...In this paper, a successfully studied and developed master - slave muld - microcomputers control system based on PC - BUS for hollow spindle fancy yarn spinning machine, mainly Its overall scheme, software and hardware construction, is introduced. Spinning experiments show that the system achieves satisfactory result. This system can solve the diftkultles of mechatronical fusion between domestic hollow splndk fancy yarn spuming muchine and its microcomputer control technology.展开更多
This article provides an overview of the laboratory-grown diamonds seen at GIA over the last 15 years.During that time,the diamond industry has witnessed an exponential increase in the quantity and quality of laborato...This article provides an overview of the laboratory-grown diamonds seen at GIA over the last 15 years.During that time,the diamond industry has witnessed an exponential increase in the quantity and quality of laboratory-grown diamonds and,therefore,these products’ability to be commercialized on a large scale.It presents a brief summary of the HPHT and CVD growth processes and then explores some of the major trends observed since GIA began providing synthetic diamond grading reports in 2007.These trends include the shift towards larger and colorless stones.It also shows a shift towards CVD diamonds dominating the supply of laboratory-grown diamonds submitted for grading reports and that the majority of these have been subjected to post-growth HPHT treatment.In addition,we briefly discuss some methods and strategies used for identification such as the distinguishing gemological characteristics and some recent approaches in advanced testing.Finally,we present an array of laboratory-grown diamonds that are currently unusual,however,these may become more common in the future.展开更多
The Man that Corrupted Hadleyburg is a classic middle-length novel written by Mark Twain. The story revolves around a sack of gold that every one of the 19 principal citizens in the"most honest and upright town&q...The Man that Corrupted Hadleyburg is a classic middle-length novel written by Mark Twain. The story revolves around a sack of gold that every one of the 19 principal citizens in the"most honest and upright town"Hadleyburg desires to claim by any means, fair or foul. The vivid description reveals the bourgeois hypocrisy of the capitalist society. This article intends to study the story from the perspective of binary opposition and finds out three pairs of opposition, they are honesty vs. hypocrisy; trust vs. trap; fancy vs. fact, which makes the story more sarcastic and full of sight and wisdom.展开更多
The poverty rate has dropped substantially in the past 40years, especially in rural areas,thanks to reform and opening up,Liu Yongfu,Director of the State Council Leading Group Office of Poverty Alleviation and Develo...The poverty rate has dropped substantially in the past 40years, especially in rural areas,thanks to reform and opening up,Liu Yongfu,Director of the State Council Leading Group Office of Poverty Alleviation and Development,said on December 8.展开更多
基金Natural Science Foundation of Tianjin,China( No. 11JCYBJC26400) Tianjin High School Scientific and Technology Fund Planning Project,China( No. 20100310)
文摘Weft knitted fancy fabrics are widely used in knitted garment design. Due to the complexity of the structures, their modeling and simulation needs to be solved in three-dimensional (3D) CAD developments. In this paper, 3D loop geometrical models of weft knitted fancy structures, including tuck stitch, jacquard stitch, transfer stitch and fleecy stitch, were developed based on an improved model of plain loop, and their central axes as some 3D space curves were achieved by using Non-Uniform Rational B-Splines (NURBS). The 3D visual simulation programme was written in C++ programming language using OpenGL, which was a function library of 3D graphics. Some examples of weft knitted fancy fabrics were generated and practical application of 3D simulation was discussed.
文摘In this paper, a successfully studied and developed master - slave muld - microcomputers control system based on PC - BUS for hollow spindle fancy yarn spinning machine, mainly Its overall scheme, software and hardware construction, is introduced. Spinning experiments show that the system achieves satisfactory result. This system can solve the diftkultles of mechatronical fusion between domestic hollow splndk fancy yarn spuming muchine and its microcomputer control technology.
文摘This article provides an overview of the laboratory-grown diamonds seen at GIA over the last 15 years.During that time,the diamond industry has witnessed an exponential increase in the quantity and quality of laboratory-grown diamonds and,therefore,these products’ability to be commercialized on a large scale.It presents a brief summary of the HPHT and CVD growth processes and then explores some of the major trends observed since GIA began providing synthetic diamond grading reports in 2007.These trends include the shift towards larger and colorless stones.It also shows a shift towards CVD diamonds dominating the supply of laboratory-grown diamonds submitted for grading reports and that the majority of these have been subjected to post-growth HPHT treatment.In addition,we briefly discuss some methods and strategies used for identification such as the distinguishing gemological characteristics and some recent approaches in advanced testing.Finally,we present an array of laboratory-grown diamonds that are currently unusual,however,these may become more common in the future.
文摘The Man that Corrupted Hadleyburg is a classic middle-length novel written by Mark Twain. The story revolves around a sack of gold that every one of the 19 principal citizens in the"most honest and upright town"Hadleyburg desires to claim by any means, fair or foul. The vivid description reveals the bourgeois hypocrisy of the capitalist society. This article intends to study the story from the perspective of binary opposition and finds out three pairs of opposition, they are honesty vs. hypocrisy; trust vs. trap; fancy vs. fact, which makes the story more sarcastic and full of sight and wisdom.
文摘The poverty rate has dropped substantially in the past 40years, especially in rural areas,thanks to reform and opening up,Liu Yongfu,Director of the State Council Leading Group Office of Poverty Alleviation and Development,said on December 8.
