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1.
Vacuum insulation panels (VIPs) have a thermal resistance that is about a factor of 10 higher than that of equally thick conventional polystyrene boards. VIPs nowadays mostly consist of a load-bearing kernel of fumed silica. The kernel is evacuated to below 1 mbar and sealed in a high- barrier laminate, which consists of several layers of Al-coated polyethylene (PE) or polyethylene terephthalate (PET). The laminate is optimized for extremely low leakage rates for air and moisture and thus for a long service life, which is required especially for building applications. The evacuated kernel has a thermal conductivity of about 4 × 10−3 W · m−1 · K−1 at room temperature, which results mainly from solid thermal conduction along the tenuous silica backbone. A U-value of 0.2 W · m−2 · K−1 results from a thickness of 2 cm. Thus slim, yet highly insulating fa?ade constructions can be realized. As the kernel has nano-size pores, the gaseous thermal conductivity becomes noticeable only for pressures above 10 mbar. Only above 100 mbar the thermal conductivity doubles to about 8 × 10−3 W · m−1 · K−1, such a pressure could occur after several decades of usage in a middle European climate. These investigations revealed that the pressure increase is due to water vapor permeating the laminate itself, and to N2 and O2, which tend to penetrate the VIP via the sealed edges. An extremely important innovation is the integration of a thermo-sensor into the VIP to nondestructively measure the thermal performance in situ. A successful “self-trial” was the integration of about 100 hand-made VIPs into the new ZAE-building in Würzburg. Afterwards, several other buildings were super-insulated using VIPs within a large joint R&D project initiated and coordinated by ZAE Bayern and funded by the Bavarian Ministry of Economics in Munich. These VIPs were manufactured commercially and integrated into floorings, the gable fa?ade of an old building under protection, the roof and the facades of a terraced house as well as into an ultra-low-energy “passive house” and the slim balustrade of a hospital. The thermal reliability of these constructions was monitored using an infrared camera.Invited paper presented at the Seventh European Conference on Thermophysical Properties, September 5-8, 2005, Bratislava, Slovak Republic. 相似文献
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Matteo Ottavian Pierantonio Facco Massimiliano Barolo Paolo Berzaghi Severino Segato Enrico Novelli Stefania Balzan 《Journal of food engineering》2012
This study investigated the possibility of using near-infrared spectroscopy (NIRS) for the authentication of Asiago d’allevo, a protected designation of origin cheese from northern Italy. Latent variable models applied on spectral data were developed and used to estimate several chemical properties and to classify the available dataset according to the location and management of the cheesemaking factory (lowland and alpine), the ripening age (6, 12, 18 and 36 months), the altitude of milk production (low, medium, medium–high and high), and the period of the year of the cheese production (May, July and September). The variable importance in projection index was used to identify the most informative spectral regions for discrimination. Results showed that NIR spectra can be used both to accurately estimate several chemical properties and to classify the samples according to the different experimental conditions under investigation with the same discrimination capacity provided by traditional chemical analysis. 相似文献
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真空导入工艺用不饱和聚酯树脂的研制 总被引:3,自引:1,他引:2
本文研究合成的不饱和聚酯树脂具有较低的粘度和较好的固化特性,粘度控制在0.21Pa.s左右,非常适用于真空导入工艺,该树脂采用真空导入工艺成型的玻璃钢制品各项性能都非常优越,有些性能指标几乎是通用树脂手糊成型性能的两倍左右。 相似文献
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MSTP技术在大客户专线接入中的应用 总被引:2,自引:0,他引:2
对大客户专线接入的种类、业务流向、实现技术等进行分析,结合MSTP技术的特点及主要技术优势提出合适的应用范围,并对MSTP的实际组网应用进行了举例。 相似文献
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针对传统SATA控制器存储系统性能受限、安全性不足问题,提出并设计了一款可实现PCIe(peripheral component interconnect express)与SATA(serial advanced technology attachment)协议传输数据互转,基于SM4算法实现本地数据安全存储的高速安全存储SoC(system of chip)芯片。通过构建合理的片内PCIe与SATA互转数据传输通路,利用PCIe VIP(verification intellectual property)及UVM(universal verification methodology)技术搭建系统应用级仿真验证平台,设计基于SystemVerilog语言的源激励用例和C固件,利用脚本自动化控制实现仿真验证。仿真结果表明,该SoC芯片通路上各设备链路建立正确,实现PCIe与SATA互转通路数据正确传输,测试带宽472 MBps,基于SM4算法的本地安全存储加解密无误,SM4算法加解密带宽1.33 Gbps。根据仿真实验结果可知,该PCIe与SATA桥接转换SoC芯片架构设计是可行的,实现了本地数据的安全存储,为进一步进行数据高速转换访问、安全传输存储研究奠定了重要基础。 相似文献
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XiaoJiang WuChengke 《电子科学学刊(英文版)》2005,22(1):53-58
In order to apply the Human Visual System (HVS) model to JPEG2000 standard, several implementation alternatives are discussed and a new scheme of visual optimization is introduced with modifying the slope of rate-distortion. The novelty is that the method of visual weighting is not lifting the coefficients in wavelet domain, but is complemented by code stream organization. It remains all the features of Embedded Block Coding with Optimized Truncation (EBCOT) such as resolution progressive, good robust for error bit spread and compatibility of lossless compression. Well performed than other methods, it keeps the shortest standard codestream and decompression time and owns the ability of Visual Progressive (VIP) coding. 相似文献