Textiles are among the most fragile artefacts in the world. They are difficult to preserve even in the best circumstances. Herein, we studied an artefacts fabric of a special nature in terms of usage. Despite the mult...Textiles are among the most fragile artefacts in the world. They are difficult to preserve even in the best circumstances. Herein, we studied an artefacts fabric of a special nature in terms of usage. Despite the multiple applications of textiles, the piece understudy is one of the unique pieces that the ancient Egyptian used as fenders for King Khufu’s first solar boat, the second-largest discovery in Egypt history. The boat was discovered inside a limestone pit. It was disassembled and arranged in several layers. Four pillows of wrapped fabric were found in the first layer, which w<span style="font-family:Verdana;">as</span><span style="font-family:Verdana;"> used as boat fenders. This use is a great discovery of the role of textiles in the manufacture of ancient boats. Thus, we conducted tests and analytical studies of those fenders using scanning electron microscopy (SEM) and an optical microscope to identify the type and nature of fibers, spinning method, and aspects of damage. Both energy-dispersive X-ray (EDX) analysis and infrared analysis (FT-IR) were employed to explore the sample’s elemental content and study the functional groups of the fabric. These analytical processes were useful in carrying out the restoration and preservation work necessary for the artefact under study.</span>展开更多
The aim of this paper is the design of a Solar-Electric Boat for tourists’ transport along the coast, in the rivers, in the lakes. Our idea is to define the project guidelines for the realization of a zero impact boa...The aim of this paper is the design of a Solar-Electric Boat for tourists’ transport along the coast, in the rivers, in the lakes. Our idea is to define the project guidelines for the realization of a zero impact boat. This paper illustrates the practical new technologies (naval architecture small craft design, mechanical and electrical design), rational design and engineering approach, safety and reliability methods used in solar boats. In our project, the boat is powered by lithiumion batteries that can be charged at any time by the photovoltaic generator placed on a flat top structure. The project is designed for brief trip around coast, where the public transport becomes very polluting during summer. Starting from the consideration that this boat is used during sunny weather, it is possible to know the boat’s energy demand and proceed with the design of a suitable electric boat and of the energy storage/management system. It is also proposed an innovative management of charge/discharge of the batteries. With this management, we have optimized the use and prolonged the time of life of the batteries during the navigation and the control of the real autonomy of it.展开更多
太阳能光伏技术的不断进步正在为太阳能船舶的快速发展提供新的契机。在船舶平台上应用太阳能光伏系统最为核心的环节是在不改变常规船舶电力系统既有架构的基础上,集成整套光伏系统设备并能够始终高效利用光伏电能。针对长江航线上营...太阳能光伏技术的不断进步正在为太阳能船舶的快速发展提供新的契机。在船舶平台上应用太阳能光伏系统最为核心的环节是在不改变常规船舶电力系统既有架构的基础上,集成整套光伏系统设备并能够始终高效利用光伏电能。针对长江航线上营运船舶绿色化和节能减排的实际需求,设计了首套应用于JD800PCC-4#内河商品汽车滚装船的船基离网型太阳能光伏系统并投入实际运行。实船运行监测数据表明,该套系统中各设备之间的技术参数设计合理,各项技术指标满足船级社规范要求。光伏系统设备与蓄电池储能装置自动匹配运行,能够实现所供照明负载24 h不间断运行,通过最大程度上利用太阳能光伏电可以实现日均节能约120 k Wh,且能够在不同运行模式下安全、可靠地切换运行。展开更多
文摘Textiles are among the most fragile artefacts in the world. They are difficult to preserve even in the best circumstances. Herein, we studied an artefacts fabric of a special nature in terms of usage. Despite the multiple applications of textiles, the piece understudy is one of the unique pieces that the ancient Egyptian used as fenders for King Khufu’s first solar boat, the second-largest discovery in Egypt history. The boat was discovered inside a limestone pit. It was disassembled and arranged in several layers. Four pillows of wrapped fabric were found in the first layer, which w<span style="font-family:Verdana;">as</span><span style="font-family:Verdana;"> used as boat fenders. This use is a great discovery of the role of textiles in the manufacture of ancient boats. Thus, we conducted tests and analytical studies of those fenders using scanning electron microscopy (SEM) and an optical microscope to identify the type and nature of fibers, spinning method, and aspects of damage. Both energy-dispersive X-ray (EDX) analysis and infrared analysis (FT-IR) were employed to explore the sample’s elemental content and study the functional groups of the fabric. These analytical processes were useful in carrying out the restoration and preservation work necessary for the artefact under study.</span>
文摘The aim of this paper is the design of a Solar-Electric Boat for tourists’ transport along the coast, in the rivers, in the lakes. Our idea is to define the project guidelines for the realization of a zero impact boat. This paper illustrates the practical new technologies (naval architecture small craft design, mechanical and electrical design), rational design and engineering approach, safety and reliability methods used in solar boats. In our project, the boat is powered by lithiumion batteries that can be charged at any time by the photovoltaic generator placed on a flat top structure. The project is designed for brief trip around coast, where the public transport becomes very polluting during summer. Starting from the consideration that this boat is used during sunny weather, it is possible to know the boat’s energy demand and proceed with the design of a suitable electric boat and of the energy storage/management system. It is also proposed an innovative management of charge/discharge of the batteries. With this management, we have optimized the use and prolonged the time of life of the batteries during the navigation and the control of the real autonomy of it.
文摘太阳能光伏技术的不断进步正在为太阳能船舶的快速发展提供新的契机。在船舶平台上应用太阳能光伏系统最为核心的环节是在不改变常规船舶电力系统既有架构的基础上,集成整套光伏系统设备并能够始终高效利用光伏电能。针对长江航线上营运船舶绿色化和节能减排的实际需求,设计了首套应用于JD800PCC-4#内河商品汽车滚装船的船基离网型太阳能光伏系统并投入实际运行。实船运行监测数据表明,该套系统中各设备之间的技术参数设计合理,各项技术指标满足船级社规范要求。光伏系统设备与蓄电池储能装置自动匹配运行,能够实现所供照明负载24 h不间断运行,通过最大程度上利用太阳能光伏电可以实现日均节能约120 k Wh,且能够在不同运行模式下安全、可靠地切换运行。
