dewar

简明释义

英[/ˈduːər/]美[/ˈduːər/]

n. 杜瓦（Sir James, 1842-1923，英国苏格兰化学家，物理学家）；杜瓦瓶（保温真空瓶，等于 Dewar flask）；迪尤尔（姓氏）

英英释义

单词用法

同义词

反义词

例句

1.In this article, a dewar for this superconducting magnet system is mainly described and experimental results about boil-off rate of the LHe under the condition of rotation and vibration is presented.

本文将主要描述该系统的杜瓦部分，并且给出在旋转和振动条件下的液氦挥发实验结果。

2.According to the test results and the analyses, the modified design has been proposed for the inside insulation structure of LHe dewar.

根据试验结果和分析研究，提出了异型杜瓦容器内部绝热结构的改进设计。

3.This paper describes the design of the Dewal for 30t pulse magnet and the calculation result for transfering heat. The LN2 Dewar is in two sections, so the installation of the magnet is convenient.

该文叙述了30万高斯脉冲磁体杜瓦的设计及传热、漏热计算结果，LN2杜瓦的设计特点是做成两截的，这样装卸磁体方便。

4.The most common unit of measure for the capacity of a dewar is the liter.

测量杜瓦瓶的容积最常用的单位是升。

5.After liquid-helium test we find that helium permeability is an important factor for FRP liquid-helium dewar.

液氦试验发现：氦气渗透是影响玻璃钢液氦杜瓦性能的重要因素，应予以重视。

6.Therefore, the cyclic stress caused by repeatedly cooling and heating during the usage of non-magnetic Dewar is one of the important reasons that causes the decrease of vacuum performance.

因此，无磁杜瓦在使用过程中反复冷却及复温所产生的循环应力载荷，是导致其真空性能下降的一个重要原因。

7.An axial symmetrical model is set up for the sealing structure of the bulkhead plate for a columniform dewar.

建立了针对柱形真空杜瓦容器端盖密封结构的轴对称模型。

8.The scientist carefully poured liquid nitrogen from the dewar (杜瓦瓶) into the experiment setup.

科学家小心地将液氮从dewar (杜瓦瓶) 倒入实验装置中。

9.We need to refill the dewar (杜瓦瓶) with helium for the upcoming experiment.

我们需要为即将到来的实验重新填充dewar (杜瓦瓶) 的氦气。

10.The dewar (杜瓦瓶) kept the samples at a stable low temperature during transport.

在运输过程中，dewar (杜瓦瓶) 保持样品在稳定的低温下。

11.He used a dewar (杜瓦瓶) to store the cryogenic liquids safely.

他使用dewar (杜瓦瓶) 安全地储存低温液体。

12.Make sure the dewar (杜瓦瓶) is properly sealed to prevent evaporation.

确保dewar (杜瓦瓶) 密封良好，以防止蒸发。

作文

The world of science is filled with fascinating instruments and tools that help researchers conduct experiments and make groundbreaking discoveries. One such instrument is the dewar, a specialized container designed to hold cryogenic liquids at very low temperatures. Named after the Scottish scientist James Dewar, who invented it in the late 19th century, the dewar has become an essential piece of equipment in laboratories around the globe. Its design allows for minimal heat transfer, which is crucial when working with substances like liquid nitrogen or liquid helium. In the field of physics, the dewar is particularly important. Researchers often need to cool materials to near absolute zero to study their properties. For instance, superconductivity, a phenomenon where certain materials exhibit zero electrical resistance, can only be observed at extremely low temperatures. The dewar enables scientists to maintain these conditions, allowing them to explore new realms of physics and develop advanced technologies. Moreover, the dewar is not limited to just physics; it also plays a vital role in chemistry and biology. In chemistry, many reactions require specific temperature controls, and the dewar provides a stable environment for these processes. In biology, researchers use dewars to store biological samples at low temperatures, ensuring their viability for future studies. This aspect is critical in fields like biobanking, where preserving genetic material or cells is necessary for research and medical applications. The construction of a dewar is quite interesting. It typically consists of an inner and outer vessel, with a vacuum space in between. This vacuum acts as an insulating layer, dramatically reducing heat transfer. Some dewars even come with additional reflective coatings to further minimize thermal exchange. This innovative design makes the dewar highly effective at keeping its contents cold, demonstrating the ingenuity of scientific advancements. As technology progresses, the applications of the dewar continue to expand. In recent years, advancements in materials science have led to the development of more efficient and durable dewars. These improvements are not only beneficial for laboratory settings but also for industries such as aerospace and medicine. For example, in the aerospace sector, dewars are used to store propellants that must be kept at cryogenic temperatures. In medicine, the storage of vaccines and other biological products at low temperatures is crucial, especially in remote areas where refrigeration may not be available. In conclusion, the dewar is a remarkable invention that has had a profound impact on various scientific disciplines. Its ability to maintain low temperatures has opened doors to new research possibilities and technological advancements. As we continue to explore the mysteries of the universe and improve our understanding of life at the molecular level, the dewar will undoubtedly remain a key player in the world of science. Understanding how to utilize and innovate upon this essential tool is crucial for future generations of scientists, as they strive to push the boundaries of knowledge and discovery.

科学世界充满了迷人的仪器和工具，帮助研究人员进行实验并取得突破性的发现。其中一种仪器是dewar，一种专门设计用于在极低温度下保存低温液体的容器。它以苏格兰科学家詹姆斯·杜瓦的名字命名，杜瓦在19世纪末发明了这种容器，现已成为全球实验室中不可或缺的设备。其设计允许最小化热传递，这在处理液氮或液氦等物质时至关重要。 在物理学领域，dewar尤为重要。研究人员常常需要将材料冷却到接近绝对零度，以研究其特性。例如，超导现象是指某些材料表现出零电阻的现象，仅能在极低温度下观察到。dewar使科学家能够维持这些条件，从而探索物理学的新领域，并开发先进技术。 此外，dewar不仅仅局限于物理学；它在化学和生物学中也发挥着重要作用。在化学中，许多反应需要特定的温度控制，而dewar提供了一个稳定的环境来进行这些过程。在生物学中，研究人员使用dewars在低温下储存生物样本，确保其在未来研究中的生命力。这一点在生物库等领域至关重要，保存遗传材料或细胞对于研究和医疗应用是必要的。 dewar的构造非常有趣。它通常由内外两个容器组成，中间有一个真空空间。这个真空作为绝缘层，显著减少热传递。一些dewars甚至配有额外的反射涂层，以进一步最小化热交换。这种创新设计使得dewar在保持内容物冷却方面非常有效，展示了科学进步的聪明才智。 随着技术的进步，dewar的应用不断扩大。近年来，材料科学的进步导致了更高效和耐用的dewars的开发。这些改进不仅对实验室环境有利，而且对航空航天和医学等行业也有益。例如，在航空航天领域，dewars用于存储必须保持在低温下的推进剂。在医学中，低温储存疫苗和其他生物产品至关重要，尤其是在缺乏制冷设备的偏远地区。 总之，dewar是一项了不起的发明，对各种科学学科产生了深远的影响。它维持低温的能力为新的研究可能性和技术进步打开了大门。随着我们继续探索宇宙的奥秘并改善对分子水平生命的理解，dewar无疑将在科学界继续扮演关键角色。理解如何利用和创新这一基本工具对未来的科学家至关重要，因为他们努力推动知识和发现的边界。