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A list of all the posts and pages found on the site. For you robots out there is an XML version available for digesting as well.
Pages
About Me
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Posts
Future Blog Post
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Blog Post number 4
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Blog Post number 1
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projects
Around
A social networking application deployed on Google Cloud Platform, written in React and Go. It allows users to share geo-tagged multi-media posts with people around. By dragging the Google map, users can also check posts all around the world. A face recognition AI is applied to identify posts with faces and users can select face mode to browse faces around. Link: https://tinyurl.com/around-app
Job+
A job search and recommendation web application developed using JS/HTML/CSS without any frameworks. The job list is grabbed from the GitHub Jobs API. Users can mark jobs as favorites. The job recommendation is based on the favorite list and the users’ geo-location. We encourage users to turn on the web browser’s locating function to make job recommendation more accurate. The Monkey learning AI is applied to identify keywords in the job description. This app is motivated by my internship-searching in the summber 2020. Link: https://tinyurl.com/jobAround
Starlink
A React-based Starlink trajectory visualizer. By inputting the latitude and longitude as well as the angle of the sky, the map will show the trajectory of the satellites in observation. The data is grabbed from a third-party API. This web application is especially designed for fans of aerospace, SpaceX and Elon Musk. Link: https://tinyurl.com/starlink-track
Tinnews
A Tinder-like news Android app
publications
Discussion on Transmission Line Inspection with Aircraft
Published in Shandong Electric Power, 2012
随着电网的日益扩大,巡线的工作量也日益加大,飞行器作为一种运载工具,可以被应用在输电线路巡检中,通过搭载各种检测设备,以实现对输电线路的日常巡视,提高线路运维效率。基于飞行器在输电线路巡检系统中的应用进行探讨,包括对于飞行器巡线系统设计思路、飞行器巡线系统组成、不同飞行器功能定位以及工程应用关键技术问题等的研究。主要的巡检方式包括可见光巡检、红外光巡检、紫外巡检和三维激光扫描巡检。巡检对象包括线路走廊、导线、塔身、金具等。巡检内容包括线路走廊异常、设备热缺陷、电晕放电等。
Recommended citation: Jiang H. "Discussion on Transmission Line Inspection with Aircraft." Shandong Electric Power. 2012, (5):16. http://www.cnki.com.cn/Article/CJFDTotal-SDDJ201205016.htm
One Dimensional Simulation of Droplet Ejection of Drop-on-Demand Inkjet
Published in ASME International Mechanical Engineering Congress and Exposition, 2018
In this study, we present a 1D method to predict the droplet ejection of a drop-on-demand (DoD) inkjet which includes the drop breakup, coalescence, and the meniscus movement at nozzle orifice. A simplified 1D slender-jet analysis based on the lubrication approximation is used to study the drop breakup. In this model, the free-surface (liquid-air interface) is represented by a shape function so that the full Navier-Stokes (NS) equations can be linearized into a set of simple partial differential equations (PDEs) which are solved by method of lines (MOL). The shape-preserving piecewise cubic interpolation and third-order polynomial curve are employed to merge approaching droplets smoothly. The printhead is simplified into a circular tube, and a 2D axisymmetric unsteady Poiseuille flow model is adopted to acquire the relationship between the time-dependent driving pressure and velocity profile of the meniscus. Drop breakup and meniscus movement are coupled together by a threshold of meniscus extension to complete a full simulation of droplet ejection. These algorithms and simulations are carried out using MATLAB code. The result is compared with a high fidelity 2D simulation which was previously developed, and good agreement is found. This demonstrates that the proposed method enables rapid parametric analysis of DoD inkjet droplet ejection as a function of nozzle dimensions, driving pressure and fluid properties.
Recommended citation: Jiang H, Tan H. "One Dimensional Simulation of Droplet Ejection of Drop-on-Demand Inkjet." ASME International Mechanical Engineering Congress and Exposition 2017. American Society of Mechanical Engineers Digital Collection. http://jianghc829.github.io/files/IMECE_2017.pdf
One dimensional Model for droplet ejection process in inkjet devices
Published in Fluids, 2018
In recent years, physics-based computer models have been increasingly applied to design the drop-on-demand (DOD) inkjet devices. The initial design stage for these devices often requires a fast turnaround time of computer models, because it usually involves a massive screening of a large number of design parameters. Thus, in the present study, a 1D model is developed to achieve the fast prediction of droplet ejection process from DOD devices, including the droplet breakup and coalescence. A popular 1D slender-jet method (Egger, 1994) is adopted in this study. The fluid dynamics in the nozzle region is described by a 2D axisymmetric unsteady Poiseuille flow model. Droplet formation and nozzle fluid dynamics are coupled, and hence solved together, to simulate the inkjet droplet ejection. The arbitrary Lagrangian–Eulerian method is employed to solve the governing equations. Numerical methods have been proposed to handle the breakup and coalescence of droplets. The proposed methods are implemented in an in-house developed MATLAB code. A series of validation examples have been carried out to evaluate the accuracy and the robustness of the proposed 1D model. Finally, a case study of the inkjet droplet ejection with different Ohnesorge number (Oh) is presented to demonstrate the capability of the proposed 1D model for DOD inkjet process. Our study has shown that 1D model can significantly reduce the computational time (usually less than one minute) yet with acceptable accuracy, which makes it very useful to explore the large parameter space of inkjet devices in a short amount of time.
Recommended citation: Jiang H, Tan H. "One dimensional Model for droplet ejection process in inkjet devices." Fluids. 2018, 3(2):28. http://jianghc829.github.io/files/Fluids_2018.pdf
A Low-Cost Flash Photographic System for Visualization of Droplets in Drop-on-Demand Inkjet
Published in Journal of Imaging Science and Technology, 2018
Flash photography has been widely used to study the droplet dynamics in drop-on-demand (DoD) inkjet due to its distinct advantages in cost and image quality. However, the whole setup, typically comprising the mounting platform, flash light source, inkjet system, CCD camera, magnification lens and pulse generator, still costs tens of thousands of dollars. To reduce the cost of visualization for DoD inkjet droplets, we proposed to replace the expensive professional pulse generator with a low-cost microcontroller board in the flash photographic system. The temporal accuracy of the microcontroller was measured by an oscilloscope. The microcontroller’s temporal stability was compared with a professional pulse generator by tracking a large number of droplet positions. To validate the effectiveness of the whole setup, the droplet ejection and the droplet impact on a silicon wafer were quantitatively analyzed and compared with theoretical predictions. Finally, sample images of droplet ejected from a commercial inkjet cartridge were presented to show the flexibility of the system.
Recommended citation: Jiang H, Merritt BA, Tan H. "A Low-Cost Flash Photographic System for Visualization of Droplets in Drop-on-Demand Inkjet." Journal of Imaging Science and Technology. 2018, 62(6):60502-1. http://jianghc829.github.io/files/JIST_2018.pdf