AI 中文总结
本文介绍两款开源低成本3D打印工具PocketCaBER与PocketDoS，用于测量粘弹性流体拉伸特性，可用于教学，能提升学生参与度并加速非线性流变学学习。
AI 中文摘要
我们介绍两款开源、可3D打印、基于柔性结构的工具，用于定量测量粘弹性流体的拉伸特性。这些低成本、便携且可扩展的设备（我们将其命名为“PocketCaBER”和“PocketDoS”），因成本低、可在民用3D打印机上打印、兼容手机相机、便携且操作友好，特别适用于野外及研究生教学环境。我们针对每款设备，将其性能与实验室对应设备进行了表征和基准测试，并提供可下载的STL文件以快速制作。我们讨论了这些设备与台式设备相比的实验局限性。最后，我们举例说明这些工具在促进学生参与聚合物科学和复杂流体课程中的应用——具体而言，通过为每位学生直接提供必要的流变学仪器（尤其是非线性拉伸流变学等高级模块），如何独特且有效地加速学习目标的达成。通过这些开源节俭科学工具让学生个人可无限期使用实验室级仪器，我们探讨了扩大非线性流变学领域参与度和参与热情的努力。
英文摘要
We describe two open-source, 3D-printable, flexure-based tools for the quantitative measurement of extensional properties of viscoelastic fluids. These low-cost, portable, and scalable devices (which we have termed ``PocketCaBER'' and ``PocketDoS'') are particularly applicable for use in the field and in graduate-level teaching environments due to their low cost, printability on hobby 3D printers, compatibility with cell phone cameras, portability and user-friendly operation. We characterize and benchmark each device's performance against its lab-equivalent counterpart and provide downloadable STL files for rapid fabrication. We discuss experimental limitations of these devices compared with their bench-top counterparts. Finally, we illustrate the use of such tools in facilitating student engagement in polymer science and complex fluids classes---specifically, how progress in learning goals can be uniquely and effectively accelerated by providing the necessary rheological instruments directly to each individual student (especially for advanced modules such as nonlinear extensional rheology). By giving students personal, indefinite access to laboratory-level instrumentation through these open-source frugal science tools, we discuss our efforts to expand participation and engagement within the field of nonlinear rheology.
