分类： 其他 >> 综合 提交时间： 2023-03-12 合作期刊: 《Art & Design Research》
摘要： Nowadays, China's elderly population base is expanding and the elderly people's health care product industry is booming, thus increasing the requirements for health care product packaging design. Relying on the application of longevity culture elements, we provide a boost to the design of health care products packaging for the elderly. Through field visits and questionnaires, we understand the needs of the elderly for health care products, analyse the shortcomings of the current health care product packaging design for the elderly, and draw up principles and measures for the application of longevity culture elements in the packaging of health care products for the elderly from the perspectives of text layout, colour and general awareness. Through the use of longevity culture elements, it will not only open up new areas for the inheritance and development of traditional longevity culture, but also meet consumers' consumption expectations.
分类： 光学 >> 量子光学 提交时间： 2023-02-19
摘要： We present a subHz linewidth portable ultrastable laser with the mass and volume of are 40kg and 400mm*280mm*450mm, respectively, that meets the requirements of automatic frequency locking and road transportation. A dynamic analytical model of the physical parts of ultrastable laser is established, and the first order resonance frequency is determined by FEA and well agrees with the experimentally measured result. To verify the transport performance of the portable ultrastable laser, it is tested for 100 km actual road transportation and 60 min continuous vibration, corresponding to 1700 km road transportation. The success of the test demonstrated that the portable ultrastable laser was very robust. Meanwhile, the portable ultrastable lasers shows that the median of the linewidth distribution is approximately 0.78 Hz, and the fractional frequency instability is less than 3E-15 at 1 to 10 s averaging time. This value approaches the total noise of 2.0E-15 including thermal noise and residual amplitude modulation. The robust suggested that the portable ultrastable laser might be a good candidate such as optical frequency transfer and metrological systems.
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