Junjie Sun | 孙俊杰

Junjie Sun | 孙俊杰

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Posts

Future Blog Post

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This post will show up by default. To disable scheduling of future posts, edit config.yml and set future: false.

Blog Post number 4

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This is a sample blog post. Lorem ipsum I can’t remember the rest of lorem ipsum and don’t have an internet connection right now. Testing testing testing this blog post. Blog posts are cool.

Blog Post number 3

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Blog Post number 2

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Blog Post number 1

less than 1 minute read

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This is a sample blog post. Lorem ipsum I can’t remember the rest of lorem ipsum and don’t have an internet connection right now. Testing testing testing this blog post. Blog posts are cool.

portfolio

publications

2. Immobilization of uranium tailings by phosphoric acid-based geopolymer with optimization of machine learning

Published in Journal of Radioanalytical and Nuclear Chemistry, 2022

To decrease the contaminant leaching and radon exhalation from uranium tailings, a phosphoric acid-based geopolymer (PAG) precursor was selected as a solidifying agent to bind coarse sands to achieve compact structures. Machine learning was applied to explore the optimal ratio of geopolymer preparation, aimed at achieving a higher compressive strength of solidified bodies. Results showed that the maximum compressive strength of 18.964 MPa appeared at the mass ratio of 2.8 for phosphoric acid/kaolin. The uranium leaching rate of 0.70 × 10−6 cm/d on the 42nd day was three orders of magnitude less than the clay mixture-based geopolymer solidified bodies. The successful synthesis of geopolymer was evidenced by the X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR), the homogeneous and dense structure of solidified bodies was characterized by the scanning electron microscopy (SEM).

Recommended citation: Zhao T, Wu H, Sun J, et al. Immobilization of uranium tailings by phosphoric acid-based geopolymer with optimization of machine learning[J]. Journal of Radioanalytical and Nuclear Chemistry, 2022, 331(9): 4047-4054.
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talks

5. Provincial level: Third Prize in National level: Third Prize in the 14th “Challenge Cup” Hunan Province College Student Extracurricular Academic and Technological Works Competition

Published:

Challenge Cup is the abbreviation of the “Challenge Cup” National College Students’ Science and Technology Competition, a national extracurricular academic and practical competition for college students co-sponsored by the Central Committee of the Communist Youth League, the China Association for Science and Technology, the Ministry of Education, the Chinese Academy of Social Sciences, and the All-China Federation of Universities. There are two parallel programs under the Challenge Cup series in China: the “Challenge Cup” National Extracurricular Academic and Technological Works Competition for College Students and the “Challenge Cup” China College Students’ Entrepreneurship Plan Competition. These two national competitions are held alternately, with each program taking place once every two years.

4. International level: Finalist (top 2%) in The Mathematical Contest in Modeling and The Interdisciplinary Contest in Modeling (MCM/ICM)

Published:

Turn theory into practice by entering one of COMAP’s modeling contests. The study of mathematics as its own subject may have started with Pythagoras, but people have been counting as a necessity of everyday life for tens of thousands of years. It follows that mathematics was invented to help us understand and manage the world around us. COMAP’s international modeling contest opportunities at the middle school, high school, and undergraduate levels challenge students to form, organize, and manage a team to model and solve a real-world application problem and present a solution report. In addition, such contests provide an experience in which students develop interpersonal skills through teamwork, develop technical writing and communication skills, feel a sense of accomplishment, and earn an impressive resume credential.

3. National level: Third Prize in “600 LIGHT YEAR” The 15th National University Student Social Practice and Science Contest on Energy Saving & Emission Reduction

Published:

The National College Students’ Energy-Saving and Emission-Reduction Social Practice and Science & Technology Competition is a prestigious innovation and social practice event for university students in China, organized by the National Organizing Committee under the guidance of the Teaching Steering Committee for Energy and Power of the Ministry of Education. As one of the most influential competitions in Chinese higher education, it focuses on key national priorities such as the “Dual Carbon” (carbon peaking and carbon neutrality) strategy. With strong support from the Ministry of Education and active participation from universities across the country, the competition has developed into a high-level platform for fostering student innovation and hands-on ability, featuring broad participation, significant impact, and a wealth of high-quality projects.

2. National level: Third Prize in The 8th National Collegiate Safety Science and Engineering Practical and Innovative Works Competition

Published:

The National Collegiate Safety Science and Engineering Practical and Innovative Works Competition is a prestigious national-level contest jointly organized by the Teaching Steering Committee for Safety Science and Engineering of the Ministry of Education, the National Academic Conference Committee on Safety Science and Engineering for College Students, the Society for Science and Technology of Public Safety, and the China Occupational Safety and Health Association. The competition is designed to foster college students’ practical engineering skills, innovation capabilities, and teamwork spirit.

1. Provincial level: Outstanding Graduates

Published:

Awarded by the Department of Education of Hunan Province for outstanding academic performance, conduct, and overall excellence among graduating students.

teaching

5. Granted: A Safety Emergency Device for Nuclear Power Reactors

Utility Model Patent, September 17, 2021

The utility model discloses a safety emergency device for nuclear power reactors. The device comprises a steam generator connected to a cooling pipe installed inside a water-cooled box via a pressure relief pipe. A remotely adjustable safety valve is mounted on the pressure relief pipe. The cooling pipe is further connected to an external discharge tank through a discharge pipe. The water-cooled box is connected to an external air-cooled tower via a water inlet pipe and an exhaust pipe, and is equipped with a drain pipe for water discharge.This device can prevent the rupture of heat transfer tubes in the steam generator, thereby avoiding nuclear contamination. Additionally, it can regulate the internal pressure of the safety shell when it rises, enabling the safety valve to open smoothly for pressure relief.

4. Granted: A Distributed Air Purification Device with Wind-Solar Hybrid Power Supply

Utility Model Patent, February 15, 2022

The utility model discloses a distributed air purification device with wind-solar hybrid power supply, comprising a base in the shape of a rectangular box with openings at both ends. A dust collection frame is fixedly connected to the lower part of the base, while a wind-solar power generation unit is mounted on the upper part. Inside the base, multiple discharge adsorption plates are arranged side by side for discharging and adsorbing particulate matter. Above these plates and within the dust collection frame, a cleaning frame is provided to remove accumulated particles. An exhaust fan is installed on one side of the discharge adsorption plates within the base, and filter plates are positioned at both the air inlet and outlet of the base. A drawer is also slidably connected inside the dust collection frame for collecting dust. This device utilizes solar energy and wind pressure generated by passing vehicles to power its operation, enabling efficient purification of roadside air in an energy-saving and environmentally friendly manner.

3. Patent Pending: An Intrinsically Safe Emergency Lighting Device Based on the Tunnel Piston Effect

Invention Patent, July 05, 2022

The present invention discloses an intrinsically safe emergency lighting device based on the tunnel piston effect, comprising a lamp bead, a power system, and a switching system, the switching system being connected in series between the lamp bead and the power system. The power system comprises a battery mounted within the shell of the lighting lamp and a power supply module that provides power to the lamp; the switching system is configured to switch between the battery and the power supply module to supply power to the lamp bead. A power detector is installed on the battery to monitor its power level in real time. When the battery is in a low-power state, it is given charging priority under the premise of ensuring the normal operation of the lighting lamp. This ensures that the battery remains fully charged at all times, avoids lack of electricity during emergencies, and further enhances the stability of the lighting lamp.

2. Granted: A Device and Method for Experimental Measurement of Radon Exhalation from Fissures in Radioactive Beach Surfaces

Invention Patent, July 26, 2024

The invention discloses a device and method for experimental measurement of radon exhalation from fissures in radioactive beach surfaces. The device comprises a sealed shell, inside which a feed bin for holding radioactive tailings sand is placed on the bottom plate. A sunlight simulation system is installed on the sidewall of the shell, and a digital imaging system for capturing fissure development is mounted on the top of the shell, aligned with the upper opening of the feed bin. Outside the shell, a wind flow simulation system and a radon concentration measurement system are arranged and connected to the internal space of the shell. The device also includes a control and processing system for managing the operation of all subsystems. This device simulates the evolution of radioactive beach surfaces under atmospheric environmental conditions, enabling experimental measurements of fissure development and changes in radon exhalation rates. The resulting data supports the development of correlation models, which help reduce environmental pollution and prevent safety hazards to surrounding populations. The invention further discloses an experimental method for measuring radon exhalation from fissures in radioactive beach surfaces using the described device.