全國中小學科展

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工程學

Development of a compact, self-stabilizing handheld camera mount

My purpose of the Research was build a small, compact device for the GoPro, which minimizes shocks that are typically caused by running and makes the video stable. The device must fit into a backpack and must be designed for the GoPro. This scenario raised two central questions for me: Which laws of physics are used for the stabilization of the camera? How can those laws of physics constructively be transformed into a working device? I have built four prototypes. To know which prototype was the best, I compared them and gained data into diagrams. The result with the last prototype was very impressive and encouraging, whether your are walking, running or skiing, the videos were no longer shaky. My final prototype consisted of a hollow tube which extended vertically. My conclusions: First the handheld camera mount mustn't be too light, as the inertia of the device is too low. Second it mustn't be too heavy, because you normally have to hold it over a certain time interval. Inertia as well as lever principal were essential to produce a smooth video. The most difficult part to build was the fully gimbaled suspension because it requires as little friction as possible and it must be precise and solid.

Fabrication of Hydrophobic Coatings Using the Sol-Gel Method

The aim of our research is to produce superhydrophobic coatings on both glass and cloth substrates in order to achieve high contact angles and low sliding angles for self-cleaning. In addition, we aim to modify these coatings to be as transparent as possible so as not to interfere with the aesthetics of the objects which will be coated. To achieve this goal, we synthesised a solution using 1H, 1H, 2H, 2H-perfluorooctyltriethoxysilane (a type of FAS), silica nanoparticles (SiO2), tetraethyl orthosilicate (TEOS), (3-glycidyloxypropyl) trimethoxysilane (Glymo) and deionised water. Using the convenient sol-gel method, coatings of 20% and 30% by weight of FAS-SiO2 nanoparticles were prepared on glass and cotton substrates. It was found that coatings containing 30% by weight of FAS-modified SiO2 nanoparticles on glass slide produced coatings with water contact angle as high as 162.8° and sliding angle as low as 4°. It can also be seen that for glass substrates, the hydrophobicity increased with an increase in percentage of FAS-modified SiO2 nanoparticles. Although the highest percentage transmittance was about 30%, texts and pictures beneath the coated glass slides were clearly readable. The cotton substrates also exhibited excellent hydrophobicity, with a water contact angle of 150° and sliding angle of 22°. Furthermore, the substrates showed good retention of colour and durability after simulated washing and 72 hours of ultraviolet (UV) weathering chamber test. These results show that the effects of washing and UV on the important properties of the cloth were insignificant.

Construction of an Emergency Portable Dynamo Mobile Phone Charging Station by Means of a Hand-Crank Gear Mechanism/ Solar Panels

The researchers aim to construct an emergency mobile phone charging station that runs on renewable energy and will serve as a cost-efficient alternative to more traditional power banks. Circuit components include a 20V / 6W solar panel supplemented by a hand-crank gear mechanism integrated with a 6V / 1A lead-acid battery, a usb output and an adjustable switch-mode power supply (SMPS) to convert excess voltage into current. Initial voltage and current outputs were measured under varying resistances. It was determined that the set-up satisfied the minimum voltage and current requirement for charging a mobile phone (5V / 1A). A subsequent phone charging test was executed using a Samsung Galaxy J2 (3.85V Li-ion battery 7.70W, Charge Voltage: 4.4V / 2000mAh) wherein it charged on an average of 0.277% per minute for the solar panel and an average of 0.263% per minute for the hand crank gear mechanism. A Mann-Whitney U statistical test was conducted to determine if the charging rate of the charging station had a significant difference from a commercially available power bank’s. The calculated UA: (4) from the test was below the lower limit and the UB: (217) was above the upper limit which indicated that there was a significant difference between the charging rates. While the efficiency was lower than the commercial power bank’s, it can still be used as an alternative charging method especially during emergencies and disasters.

本土性微藻結合廢水之生質柴油產製

本研究以淡水常見之微藻進行培養,首先篩選出頂棘藻Chodatella sp.為研究對象,第二階段設計不同曝氣量及不同LED燈之佈光面積進行藻類培養比較,再以部分因素法探討微藻培養之最佳化條件;第三階段設計LED光生物反應器培養微藻,探討其可行性及微藻降解畜牧廢水營養鹽之能力。實驗結果顯示,曝氣的培養方式以及增加佈光面積有助於微藻生長,而部分因素法實驗設計結果,影響生質潛勢最重要因子為置換天數。另外,LED光生物反應器培養的微藻其生質物產率高達230.73 mg / L.d,水中的營養鹽去除率皆高達約90 %以上,藻粉油脂含量為28.77 %,脂肪酸組成顯示碳數具有C16-C18之物質,與生質柴油的組成物質相符,非常具有轉化成生質柴油的潛勢。

使用機械手臂實現黑白棋之人機對弈

由工業4.0智慧生產的啟發,建構機械手臂進行人工智慧黑白棋之對弈系統,透過視訊分析棋面資料,輸入人工智慧黑白棋遊戲判斷。依據結果指揮機械手臂進行落子、取子的動作,人機對奕過程亦會判斷有無不合理的地方,以維持棋奕的規則公平。擷取雲端攝影機的盤面影像,使用霍夫找圓演算法取得棋目位置,透過彩度與明度分析黑子、白子或無子,黑白棋AI程式再透過遊戲樹演算決定落子、取子位置。透過畢氏定理及餘弦定理將棋子位置的立體座標轉成工具座標,再傳送至主控伺服器以指揮機械手臂進行正確的動作。透過減輕重量及使用彈力平衡力矩改善,機械手臂可改善硬體準確度,重現率測試達85%以上。黑白棋AI程式棋力可以與黑白棋app的3級力敵。視訊判斷棋局在調整適當彩度明度後可達100%正確率。透過演算法指揮機器手臂下棋,棋局中完成正確動作可達80%以上的成功率。

Androcopter, using smartphones as flightcontrollers for Quadrocopters

This project proposes that smartphones are capable of steering a quadcopter, doubling as a flight controller unit. This means that sensor results from the smartphone’s IMU (inertial measurement unit) are compared with steering commands from the pilot received over Wi-Fi or a RC-transmitter. The idea behind this project was to build a cheap flight control for a quadcopter. Smartphones seemed to be the perfect device because of their dominance in the market. The first step was constructing the quadcopter’s frame. I first designed the frame on AutoCAD and then built a prototype out of aluminium. My search for a possibility to connect the engines or low level peripherals to a smartphone led to the «IOIO-Board». After collecting sufficient information about sensor fusion and control theory I started working on my own controller. Due to the frame’s large size the quadcopter is very stable and best suited for aerial photography. Engine control by smartphone using an «IOIO-Board» is fast enough for flight. A smartphone possesses everything needed to control a quadcopter. The disadvantage of using a smartphone is that the processor has to calculate multiple applications simultaneously. This makes it more difficult to guarantee the correct timing of operations. Nevertheless, external influences such as phone calls do not influence the flight behavior of the quadcopter. As work in progress I have experimented with the implementation of GPS and an onboard camera.

An Innovative Design of Enhanced-Performance Solar Panel Using Heat Pipe and Thermoelectric Generator

Solar energy is a main source of energy that is expected to play a vital role in fulfilling the future global demand of electricity. Design of advanced photovoltaic (PV) system with high electric conversion efficiency is the key for collecting solar energy. A major obstacle hindering useful PV utilization is the deterioration of solar cell efficiency with temperature. The present results of experimentation have shown that there occurs a reduction of approximately 33% in the solar panel efficiency as the operating temperature increases from 45 °C to 68 °C at 1000 W/m2. Therefore, an innovative design of enhanced-performance solar panel using micro flat heat pipe (HP) and thermoelectric generator (TEG) is proposed and experimentally investigated in the presented project. To operate HP and TEG at highest possible efficiency, the condensation section of HP is innovatively cooled by utilize the condensed water inside the evaporator of air conditioner (which is usually between 5-7 °C). Two different types of silicon panel are used in the study: monocrystalline solar panel and polycrystalline solar panel. The results showed that a reduction in average solar panel temperature up to 25% is obtained. In addition, produced power was increased by as much as 50% when solar panel was cooled by the heat pipe. Finally, the feasibility study and cost analysis of the proposed hybrid system are discussed in details and presented.

Improving Spinal Fusions: Redesigning the Pedicle Probe to Prevent Vertebral Breaches

Pedicle probes are medical devices used by surgeons during spinal fusions for patients with conditions such as scoliosis and spinal fractures. The probe creates pilot holes to guide the placement of pedicle screws in vertebrae. The screws are then connected with a metal rod to stabilize the spine. Twenty-nine percent of patients who undergo spinal fusions suffer from vertebral breaches – accidental damage to the spinal cord – which cause complications such as infection, motor defects, and in many cases paralysis. My goal was to make spinal fusions safer by redesigning the pedicle probe to provide surgeons with instantaneous feedback on the probe’s location, enabling them to more accurately place pedicle screws. The pedicle probe I developed takes advantage of the difference in density between the inner cancellous (spongy) bone and the outer cortical (compact) bone found in vertebrae. Cortical bone is avoided by monitoring the cannulation force – the force required to insert the probe. When the probe contacts denser cortical tissue, it warns the user by providing tactile and visual feedback through a vibration motor and an LED. This enables the surgeon to redirect the probe and advance down the optimum path, preventing a possible breach. It proved successful in preventing breaches on lamb vertebrae, which closely resemble human vertebrae. This novel device improves feedback to the surgeon and eliminates the need for costly and potentially harmful ionizing radiation exposure. Furthermore, it does not depend on, or require, any preoperative imaging. The cost of manufacturing the improved probe is less than $42 USD (NT$1297). Results of patent searches for 加拿大, the 美國, and Europe suggest that the redesigned probe is unique in predicting and preventing breaches in spinal fusions based on predetermined force threshold values. The probe is also unique in enabling personalized procedures in spinal fusions for those with complications, through calibrating a control (force) limit based on tissue samples prior to the procedure. Enhancing a surgeon’s ability to determine an appropriate path for pedicle screws through a sensor-enabled probe has the potential to significantly reduce the incidence of vertebral breaches during spinal fusion surgery.

The new engine

The aim of this project is to eliminate the huge consummation of petrol in the field of transportation. This project will be based on the creation of an engine. It is not only economic but also, it does not pollute the environment. In order to think about the scientific strategy of this engine, I had a look at the work of many previous inventors who worked on a similar engine. But the engine I fabricated has as additions: - The use of clean energies (air, electrical energy and electromagnetic energy) - It is an engine the energy of which is renewable and it does not necessitate the intervention of man to give it energy .THIS MEANS THAT IT WORKS ALONE.

電場中的小晶靈-高電壓電場中液滴的結晶現象

本研究設計相機-顯微鏡-玻璃座平行銅片電場裝置,拍攝鹽類液滴在高電壓電場中的結晶現象,並以色階曲線為基礎,發展出SCL值,來偵測晶體表面的性質。實驗先找到能讓晶體成長趨向單顆且高透明的條件為:加蓋(低蒸發速率)、過濾、無施加電場與低熱LED光源。並應用蒸發速率差異,發現食鹽晶體的變速成長現象。蒸發快會形成階梯螺旋紋,蒸發慢,紋路消失,變成全透明晶體。將這裝置轉放在高電壓電場下可發現:晶體形狀發生改變(晶體傾斜或碎晶),透光度變差(SCL值變小),可觀察到新生晶體邊緣,有條狀暗紋出現,但晶體成長速率變化不大。鹽晶析出反應會因些微的外在變化,而影響溶液中離子堆疊,在晶體表面出現陰影或不規則紋路。這種對外在環境有著高度反應的現象,可以透過反應位能曲線圖來解釋,正可以用來研究外界高壓電場如何對物質發生影響。