搜尋結果
查詢 the共找到 1464筆。 如查無相關資訊,可至 進階搜尋 進行查詢
熱門關鍵字: the king 水果 豆漿 電腦
科展作品檢索

Is the fruit safe?-吊白塊的簡易自製試劑

吊白塊是一種在現切水果中常見的食品添加物,它可使剛切的水果不易被氧化,並同時具有漂白的效果,但此種添加物會對人體造成許多疾病。本研究針對吊白塊作嘗試性的初級檢驗,選用一般常見的氧化劑和染料,自行研發簡易的檢驗方法,且進一步製作安定性佳且攜帶方便的試紙。本實驗結果發現,由衛生局提供的「藍吊試劑」本身不甚穩定,且顏色變化不明顯;在自製檢驗試劑方面,效果最佳的是過錳酸鉀,濃度可測至0.0005M,且反應相當快速,唯試液容易與水果表面的Fe(II)離子反應;孔雀綠和晶紅酸等染料效果亦佳,且變色相當明顯,但反應時間較長。Rongalit is a bleaching agent commonly used as a food additive. It can prevent fresh fruits to be oxidized (without color-changed), especially when they were cut for sale. However, as for this additive, it is not good on health and is necessary to be detected. The test-paper currently used, the so-called “blue-test paper”, can be obtained from the Department of Health (Taipei). However, its stability is poor; the color change is not clear when it reacts with Rongalit. For this reason, I developed simple methods for detecting Rongalit by using various oxidizers and dyes. A test-paper, with better stability and easily for carry, was successfully developed. The findings show that the use of KMnO4 on the homemade test-paper provides the best result. The reaction time is short and the limit of detection can be improved to 5 × 10-4 M. The color changes were also clear when malachite green and fuchsin acid were used, but the reaction times were longer.

> 更多

科展作品檢索

棋子排列的平均值

本研究由下述問題開始:將n1 個黑色棋子和n2 個白色棋子排成一列,規定第一個棋子必為黑棋;對於每一種排列方法中,同色棋相鄰處記為1,異色棋相鄰處記為-1,所有1 和-1 的總和記為 t (n1,n2 )。對所有可能的排列方法所算出來的t( n1,n2 ) 值求其平均值,記為a (n1,n2 ) 。我們先由觀察各種n1 和n2 值,得到這平均值的可能公式,隨後並嚴格證明其正確性,證明方法也經過多次精鍊到十分簡潔的方式。以此為基礎,我們並做了各方向的推廣,研究涉及下列各點:(一) 利用組合數探討原來的問題。(二) 在第一個棋子不限定為黑棋的假設下,求平均值a( n1,n2 ) 。(三) 將棋子由兩種增加到多種。(四) 改變棋子排列以及相鄰的方式。經由研究,我們發現,每一次愈將問題推廣時,愈能找出清晰的概念涵蓋並印證先前的想法。Our study starts with the following problem. Suppose n1 black chesses and n2 white chesses are arranged in a line under the condition that the first chess is black. For any arrangement of these chesses, an adjacent pair of chesses having the same (respectively, different) colors is associated with a value of 1 (respectively, -1). Let t(n1,n2 ) denote the sum of these values. The purpose of this problem is to calculate the average value a (n1,n2 ) of these t (n1,n2 )which runs over all possible arrangements of the chesses described above. We begin from observing various values of n1 and n2 and find a possible formula for the solution. We then give a rigorous proof for the formula. After some refinements, simple proofs are also established. Based on this, we also make some generalizations. In summary, the research includes the following: 1. Study the problem by using binomial coefficients. 2. Calculate a(n1,n2 ) when t( n1,n2 ) runs over all possible arrangements in which the first chess can be black or white. 3. Increase the types of chesses from two to many. 4. Variant the arrangement method of the chesses from a line to other configurations. During the study, we find that whenever we extend the problem to a more general case, we make the ideas for the original problem clearer.

> 更多

科學研習月刊

58-05

NO.58-05 2019 OCT | 科學研習期刊目錄 本期專題 從臺灣邁向國際的機器人教育 FRC菜鳥教練的驚奇之旅 | 謝曜隆 機器人賽事分享 | 蘇鼎欽 淡江大學電機系機器人研發團隊 歷年參與國內外競賽心得分享 | 林怡仲、李世安、劉智誠、翁慶昌 人機合作模式的機器人教學設計 | 李文宏、陳璽宇 教學現場 生活科技競賽與108新課綱之結合 | 林坤誼 在成功國小和機器人相遇 | 鄭頌穎 機器人專題課程如何在高中階段實踐 | 汪殿杰 自製雷文霍克顯微鏡 | 陳其威 科學新知 熱浪洶湧的夏天 | 盧孟明 特約專欄 最快的小碎步 | 游森棚 STEAM機械摩天輪教具研發與教學 | 黃琴扉、葉凡愉 玩出繪本好味道-食育與動作發展 | 劉淑雯 科普活動報導 民間組織所舉辦的機器人競賽-台灣玉山機器人協會 | 謝宣而 培養科學的愛好者:「全國科學探究競賽-這樣教我就懂」 | 蔣振宇 氣象探究研習營-數位科技愛地球 | 楊玉蘭、黃嘉郁、蘇萬生 總召集人的話 機器人(robot)和教育的關連至少有三個面向:一是以機器人為學習內容(learning ABOUT robot)—將機器人當作學習科目或單元;二是以機器人為學習工具(learning WITH robot)—將機器人當作輔助、管理和/或支援學習的工具;三是以機器人為學習管道(learning THROUGH robot)—將主持教學的機器人當作學習管道。目前我國機器人教育在前兩個面向愈來愈普及,不但在學習者年齡層方面正持續向下扎根,在學習場域方面也正努力和國際接軌。本期特別以「從臺灣邁向國際的機器人教育」為專題。 「本期專題」單元共有四篇文章,〈FRC菜鳥教練的驚奇之旅〉一文介紹每年吸引世界各國對機器人製作有興趣的高中生,爭相投入的FRC機器競賽活動。〈機器人賽事分享〉一文介紹FIRST系列機器人競賽。〈淡江大學電機系機器人研發團隊歷年參與國內外競賽心得分享〉一文分享該研發團隊近幾年在國內外「輪型組」、「人形組」和「手臂組」機器人競賽中屢次獲獎的成果與心得。〈人機合作模式的機器人教學設計〉一文則以2019年「START!智慧小車競賽」的競賽試題為例,提出人機合作模式的機器人教學設計理念。 「教學現場」單元也刊登四篇文章,〈生活科技競賽與108新課綱之結合〉一文介紹當今的國、高中生活科技競賽,並說明其與108新課綱的結合。〈在成功國小和機器人相遇〉一文分享桃園市成功國小實施機器人課程與教學的經驗和心得。〈機器人專題課程如何在高中階段實踐〉一文分享臺北市立大同高中透過選修方式實施兩年機器人專題課程的經驗與成果。〈自製雷文霍克顯微鏡〉一文則介紹如何製作簡單的隨身單式顯微鏡。 「科學新知」單元刊登〈熱浪洶湧的夏天〉一文,指出全球暖化速度未減、各地愈來愈熱以及氣候行動新篇章。 「特約專欄」單元刊登三篇文章,〈最快的小碎步〉一文拋出隨便選一個正整數n再找出分母最小之有理數b/a使n、a和b構成特定關係式的問題。〈STEAM機械摩天輪教具研發與教學〉一文介紹運用STEAM整合式學習模式,結合布魯姆分類學概念,所發展之創新教案。〈玩出繪本好味道--食育與動作發展〉一文則分享可如何透過繪本導入烹飪活動,讓兒童學會飲食相關知識,並促進動作發展。 本期「科普活動報導」單元刊登三篇文章,〈民間組織所舉辦的機器人競賽--台灣玉山機器人協會〉一文,介紹該協會辦理機器人競賽的活動與心得。〈全國科學探究競賽--這樣教我就懂」〉一文介紹「這樣教我就懂」科學探究競賽的緣由、現況與展望。〈氣象探究研習營--數位科技愛地球 〉一文則是台北市國中、小學生「氣象探究研習營--數位科技愛地球」活動的回顧與展望。 總召編輯委員 - 李隆盛 關於本刊 出版單位:國立臺灣科學教育館 發行人:陳雪玉 總召集人:李隆盛 編輯委員: 物理科吳仲卿/陳耀榮/李柏翰/盧玉玲 | 化學科古建國/許良榮/王伯昌/林如章/周金城 | 生物科王美芬/蕭世輝/陳建志/郭淑妙 | 地球科學許民陽/王郁軒/李文禮 科技科張玉山/汪殿杰/林育沖/趙珩宇 | 數學科李源順/鄧家駿/溫世展/張宮明 | 跨領域學科李名揚/連信仲 | 特約專欄 游森棚/黃琴扉/劉淑雯 策劃:曾聰邦 主編:錢康偉 本月專題特約主編:張玉山 編輯:吳郡怡 網頁設計編輯:施曉恬/廖憶慈/顏韶寬/蔡婉懿 投稿規範請來信詢問:article@mail.ntsec.gov.tw

> 更多

科展作品檢索

Shock Induced Battery

a. Purpose of the Research Evidence has shown that people are becoming more aware of environmental protection than in the past. Not only has the government made every effort to implement the policies of environmental protection, but Hong Kong citizens are also more willing to cooperate and help out. However, when it comes to conservation of energy and reduction of wastage, many people still regard it as a burden and they just take it lightly. In fact, environmental protection can be achieved in a convenient and simple way. We can easily put in practice in our daily lives. Because of this, we would like to introduce our invention - “shock Induced battery” by using our knowledge of Physics. b. Procedures The “Shock Induced battery” makes use of locomotion of human bodies to generate electricity. The electrical current generated from the specially designed generator will pass through the diode bridges, which adjust the current to one direction. This enables the electrical energy to be stored in the capacitor. This energy will be released when the battery is correctly connected to a circuit with a switch and a resistor. One of the features of the battery is that it is portable. It is mainly used to charge up electrical devices. But it is hoped that it will replace non-chargeable cells one day, and can directly be used in any electrical devices. In fact, our ultimate goal is to reduce the wastage of materials for making the cells, and to solve the problem of disposal of these cells. c. Data The induced a.c. voltage is full-wave rectified by the diode bridge. d. Conclusions In a word, we are trying to provide a chance for people to put environmental protection in practice, so as to raise the awareness of people about environmental protection. After all, high-tech products only solve the power-saving problem to a certain extent, but it is the awareness and the initiatives of the public which matter. We are convinced that environmental protection brings fun to your daily lives, as you will find practices on environmental protection both convenient and simple.

> 更多

科展作品檢索

探討「避開矩形框」的配置方法與推廣

一、若Mn×n(s)表示在n×n 的正方形棋盤中,排列s 顆棋子在方格內,且每一方格最多只能排1子,其中s 顆棋子的配置需滿足兩個條件:1. 並無任意4 子可以形成矩形框的4 個頂點。(此矩形框的邊需與棋盤的邊平行)2. 在沒有棋子的方格中,無法再加入棋子。二、若Vn×n×n(a1,……,an) 表示在n×n×n 的正方體棋盤中,每層的棋子個數分別為a1,……,an,且s= a1+……+an,其中s 顆棋子的配置需滿足兩個條件:1. 並無任意8 子可以形成長方體的8 個頂點。(此長方體的邊需與立體棋盤的邊平行)2. 在沒有棋子的方格中,無法再加入棋子。本研究即在Mn×n(s)與Vn×n×n(a1,……,an) , s= a1+……+an 中探討s 的最小值、最大值及變化情形,並分析其配置方法。之後推廣至長方形Mn×m(s)及長方體Vn×m×k(a1,……,ak) , s= a1+……+ak。最後根據其研究結果設計一個「避開矩形框棋」,並加以分析出致勝的策略。一.If Mn×n(s) indicates in the n×n square chessboard, we put s chesses to line in the square and each square only can put one chess. Then the station of s chesses must satisfy the following two conditions:1. No any 4 chesses can form the tops of the rectangular frame ( The sides of rectangular frame must be parallel to the sides of chessboard )2. If there’s no chess in the square, we can’t add any chess. 二.If Mn×n×n(a1,……,an) indicates in the n×n×n square chessboard, the chess number in each layer are a1,……,an and s= a1+……+an. The station of s chesses must satisfy the following two conditions: 1. No any 8 chesses can form eight tops of the rectangular cube ( The sides of rectangular cube must be parallel to the sides of cubic chessboard ) 2. If there’s no chess in the square, we can’t add any chess. This research try to explore the minimum, maximum and variation of s which in Mn×n(s) and Mn×n×n(a1,……,an), s= a1+……+an, and analyze its station. Then we will extend the research to rectangle Mn×m(s) and rectangular cube Vn×m×k(a1,……,ak), s= a1+……+ak. Finally, according to the result of research we wish can design one “avert rectangular frame chess“ and analyze the strategies to triumph.

> 更多

科展作品檢索

太陽能發電環境評估與追蹤器探討

本研究首先探討台灣各地的日照時數與世界重要都市的比較,發現台灣南部日照時數皆超過2000 小時,適合發展太陽能。接著,?了增加陽光的能量密度而加設弗瑞奈透鏡,雖然能順利的使照度放大三百餘倍,但歲日照角度的影響甚鉅,?了克服角度的問題,我們決定開發自製的追蹤器來改善角度的問題。太陽能板需要改變仰角跟傾角(雙軸調整),由光感應器判斷及自動控制程式,判斷隨時辰與季節變化的太陽角度。當搭配奈米塗料、弗瑞奈透鏡與追蹤器,總輸出功率可增加約50%。太陽電池表面玻璃會阻擋藍紫光的吸收,但本研究在太陽能板上塗佈奈米塗料,發現能增加短波長的吸收;經實驗後奈米等級表面具有自潔效應,可防止灰塵雨滴的堆積影響光線吸收,具有開發價值。This project first compares Taiwanese locations with other places in the world on average daylight times. It was discovered that southern Taiwan has the longest average daylight time all over 2000 hour sand therefore most ripe for solar power development. To increase the energy density of solar Fresnel lenses were incorporated. Although this has the advantage of magnifying illumination by three hundred percent, the alignment angle for the solar panel will have a significant impact on performance. We then designed and built a automated tracking device with illumination sensors to control the elevation and inclination of the solar panel which adjusts the angle according to environmental conditions such as time of day and season. When solar cell collocate Nano coating, Fresnel lens, tracking device, its power can promote almost150%. The glasses on the solar cell will interfere solar cell absorbing blue and purple light, but we lay on a Nano coating and we find Nano coating can improve solar cell to absorb short wave; and surface o Nano have lotus effect, it can prevent dust and rain effecting solar cell absorb lights, and it is worth developing .

> 更多

科展作品檢索

流體碰撞物體所產生的波形之研究及應用

當流體由圓管流下,在碰撞到物體後水流會產生類似駐波的形狀。為瞭解此現象的產生機制,及影響此現象的變因,我們改變流體的表面張力、流速及與碰撞物體間的距離,以探討各變因對波形所產生的影響,進而研究此現象的成因。由實驗結果發現波形會因流速加快、擋板距離增加、表面張力減少而有波長變短的趨勢,且可以用表面張力波的理論解釋。由理論推導的結果,可測量液體表面張力。由於圓球狀的外型使表面積增大,可增加液體之散熱的面積,因此可應用在水冷系統方面。A phenomenon similar to the standing wave, which occurs when a slow-velocity fluid jet collides with an obstacle, was observed. Because the free surface profile was observed to be stable, the phenomenon was not considered as standing wave. To understand the mechanism of this phenomenon and the factors that can affect the free surface profile, the surface tension of the fluid, jet velocity and the distance between the exit of the tube and the obstacle are varied to study their influences on the free surface profile. According to our experiment, the wave length is shortened when the jet velocity or the distance between the tube and the obstacle increases or when the surface tension decreases. The tendency of the investigated phenomenon can be explained by the capillary wave theory. Based on Bernoulli’s principle, continuity principle and surface tension\r equation, an ODE (ordinary differential equation) could be formulated. By using numerical method to solve this ODE, we predict the free surface profile which could match the experimental photo well. The tendency of the phenomenon can also be explained by the ODE. In order to measure the surface tension of the fluid, we wish to minimize the experiment apparatus. To enhance our assumption we use laser to locate the individual particle that we add in the fluid and calculate the velocity field of the flow jet.

> 更多

科展作品檢索

Waste Not,Want Not

Many people in South Africa still use open fires for cooking. There is a\r large amount of wasted heat lost by four methods of heat transfer:-\r radiation, convection, conduction and evaporation.\r I constructed a vessel that would reduce heat loss, and focus the heat\r emitted from a fire onto the bottom of a pot. I used materials that were\r cheap and easy to obtain, so that those using open fires would be able to\r construct similar vessels to save energy and reduce pollution.\r The vessels were made up of a standard wire mesh frame that was\r surround by trial coverings, namely tin foil, asbestos rope, industrial foil,\r papier mache, ceramic, and 2 ceiling insulators.\r 5 mls of methylated spirits was burned in each vessel. The temperature\r gain of 100mls of water in a standard pot was recorded. 5 trials on each\r vessel were performed. 2 groups of vessel were found. Those that\r produced high temperature gains, burned quickly, and produced a large\r amount of soot deposits on the pot, and a second group that did the\r opposite.\r I compared the rate of heating from my best vessel to that of a stove as\r well as a microwave oven. Heating from the vessel was faster than that of\r the stove, and slightly slower than the microwave.\r I measured the heat emitted from a fire in a three-dimensional pattern and\r found that the maximal heat was some distance above the flame.\r From these results I devised 12 guidelines that would minimize the\r energy need, and pollution produced, when cooking on an open fire

> 更多

科展作品檢索

奈米科技材料新發現-氮化鉻

利用陰極電弧蒸鍍各種薄膜,如:類鑽膜(DLC)、氮化鈦膜(TiN)、氮化鉻膜(CrN)、氮化鋁鈦膜(TiAlN)以及先披覆上一層氮化鋁鈦膜(TiAlN)再加上類鑽膜(DLC)的合成膜等。這些薄膜現在已經被廣泛的應用於各種刀具、模具的表面處理之中。本研究主要在探討高速鋼鍍上氮化鉻膜(CrN)之後,對於硬度、磨耗性質的改變,以及觀察氮化鉻膜(CrN)表面結構之組織。 在研究中我們運用陰極電弧蒸鍍系統蒸鍍氮化鉻薄膜,分析上運用SEM來觀察薄膜表面結構組織,以及運用洛氏微硬度機來觀察試片的硬度,另外還有使用磨耗試驗機來進行磨耗測試。以上這些測試總括來說都是在得知性質有無實際上的改變,而這些實際上的改變對於蒸鍍之後的模具或刀具都能夠大幅的提高使用的壽命。 We evaporated different kinds of thin films by using the anode of the electronic arc, such as DLC (Diamond-Like Carbon), TiN (Titanium Nitride), CrN (Chromium Nitride), TiAlN (Titanium Aluminum Nitride), and synthetic films of covering TiAlN and DLC. These thin films have been used widely in processing the surface of a variety of cutters and moulds. The purposes of this research were to investigate changes of hardness and abrasion and to observe the organization of the surface structure of CrN after High-speed steel evaporates CrN. In this study, we use the system of the anode of electronic arc to evaporate CrN. Besides, SEM is used to observe the organization of the surface structure of the thin films and Rockwell Micro-hardness Test Machine is used to investigate hardness of testing samples. Moreover, we use Abrasion Tester to test abrasion. These tests are taken to lead to a better understanding whether the quality really changed. These changes of evaporated moulds or cutters would extend their frequency of using.

> 更多

科展作品檢索

緩步門的木乃伊-會蟄伏的熊蟲

The study is to investigate Taiwanese tardigrades,and the research of that is few. Tardigrades are commonly called water bears and have been identified more than 750 species. Limno-terrestrial tardigrades are small, 0.2-0.5 mm in length, and mostly found in moss cushions growing on rocks, soil, or the wall of houses. When the environment dehydrates in dry weather, Tardigrades desiccate into a reversible state of metabolic suspension called cryptobiosis. We have been finding a number of tardigrades in moss at many places in Taoyuan country. First, we put the moss on the dissected microscope to seek for tardigrades, and then placed it on the microscope for photographing and observing. The study is mainly focus on Taiwanese tardigrades. we have classified 11 Taiwanese species in four families(Echiniscidae,Calohypsibiidae,Milnesiidae and Macrobiotidae), making Chinese keys of classification. From the habitat envoriment, the species, the density and the diversity we survey as well as the most suitable pH envoriment we experiment, we approach the relationship between the distribution of tardigrades and their habitat. Besides, we also research lots of conditions which bring cryptobiosis and make culture medium in order to inspect its living. These results indicate that tardigrades desiccate into cryptobiosis in ten munites in acid rain(pH4.65). From outdoor surveys, we have noticed tardigrades can’t be found in the moss right next to road.The length of each family is: Calohypsibiidae>Milnesiidae Milnesium>Macrobiotidae>Echiniscidae. 此研究是探討台灣熊蟲,而有關台灣熊蟲的文獻資料極少。熊蟲屬於緩步門,體長約 0.2-0.5 mm,熊蟲在不利的環境會蟄伏,環境有利時又會膨脹而復甦,而其構造系統不因此而破壞。 我們在桃園縣多處的苔蘚發現熊蟲,我們先將採集的苔蘚放至解剖顯微鏡下尋找熊蟲,再由複式顯微鏡觀察構造並拍照紀錄。研究主要是探討台灣本地的熊蟲,我們已分類出十一種台灣熊蟲,製作中文檢索表。藉由觀測採集環境和所測的密度、歧異度和種類,及實驗出其最適宜的 pH值,探討環境對其分布的影響。也探討各種因素與蟄伏的關係,製作培養基以觀測其生活史。研究結果顯示:1.已經分類出台灣有緩步門四科(端爪科、Calohypsibiidae科、Milnesiidae科和 Macrobiotidae科)十一種熊蟲。2. 污染嚴重或環境髒亂的地方,不會有熊蟲的存在,且熊蟲有群居性。3. 端爪科(棕色)熊蟲在 pH4.65(台灣都會區雨的酸鹼值)以下的液體環境活動力明顯降低。4.熊蟲多分布在高溼度(87.5~90.4%)的地方,不分布在中低溼度 (76%以下) 的地區。5. 各科的體長為 Calohypsibiidae科>Milnesiidae科 Milnesium屬>Macrobiotidae科>端爪科。

> 更多

科展作品檢索

Construction of a Mechanical Prototype of a Microtremor Recorder

Ambient vibration, the movement of the ground caused by transient objects such as the relative to values obtained using the commercial recorder. The natural ambient vibration of a control site was simultaneously obtained using the mechanical prototype and the commercial recorder, which were situated next to each other during the actual recording. Moreover, both sensors were used to record a control stimulus for a constant amount of time. The data obtained from these subparts were processed using WinWaveShot which quantified and presented ambient vibration as waves. The deviations of the maximum and minimum amplitudes, mode and median values of these waves, as graphed by DADiSP2002, was performed to verify the accuracy or reliability of the prototype. These graphs were converted to their DFT graphs and histograms, with accompanying converted wave properties which characterized the predominant frequency. Based from the results, the recordings obtained from the mAVR are proportional from the ones obtained from the eAVR. Therefore, the mechanical prototype is capable of recording the predominant frequency of a site. The prototype, when improved, is a potential alternative to commercial sensors since it is able to record actual movements and its scale is proportional to the scale of the eAVR. Since the prototype was constructed and can be reproduced from readily available and inexpensive materials, ambient vibration analysis can be used more commonly by architects and engineers for construction purposes. To verify the reliability of the values obtained using the prototype, the ambient vibration of other sites must be recorded and compared to those using the eAVR. wind, sounds and human activities, is one major site effect evaluation method presently used. The respective predominant frequencies of a site and the structures above it obtained using this method serve as reference to the renovation and/or construction of structures. Predominant frequencies of the landmass and the structures above it should be non-identical to avoid prolonged shaking with the occurrence of an extensive movement of the ground as dictated by resonance effect. Since electronic ambient vibration or microtremor recorders, specifically their sensors, are expensive and inaccessible, a mechanical prototype of such device was designed and constructed. The proposed design of the mechanical ambient vibration recorder (mAVR) was mainly based on the IRIS Seismograph which makes use of the principle of electromagnetic induction. The relationship between ground motion and the movement of the prototype lever, which is a direct proportion, was the concept highlighted by the prototype’s mechanism. After the design of the mAVR prototype was finalized, its assembly, which consisted of the calibration of the solenoid and the inertial mass, was performed. The calibration of the solenoid was based on the voltage output of its solenoid based on the number of turns while the inertial mass was determined based on the equilibrium level of the prototype lever. Having proven the mAVR’s capacity to function by simulating stimulus, the testing of its accuracy was done with two setups: recording of (1) natural and (2) induced ambient vibration. This tested the prototype’s accuracy

> 更多

科展作品檢索

Applications of Biofuel Technologies for Third World Countries

Innovative, inexpensive, sustainable fuel for cooking and light can be produced with an anaerobic digestion biogas system. A biodigester was designed from parts that are locally available to purchase and maintain in a developing nation. The prototype was designed, built and the engineering was approved and tested. Research and testing of techniques used to produce biogas were recorded and analyzed. The digester successfully produced enough biogas to connect to a stove and burn. Research and testing continued on different ways to pressurize the biogas. A burn time of eleven minutes was recorded. A Bunsen burner was designed, again from locally available parts, in order to enhance the flame to use for cooking. The designed digester and burner worked satisfactorily to burn the biogas collected in the system. Using small scale tests, additional research and testing continued on the most efficient production of the biogas. Figure 1 shows the results of the small scale biogas testing. The results from the small scale testing showed that the best variables for producing biogas are using school compost, ie apples, bananas, oranges, cucumbers, grapefruit, grapes etc, which has been blended to acquire the most surface area with a 1:1 ratio. Figure 3 shows the results of a sample of methane (first three peaks) and of the biogas that was produced (last two peaks). The first peak is the nitrogen and the oxygen in the sample. The second peak is the methane and the third peak is carbon dioxide. The first biogas sample that was tested had no methane so there was an absence of the second peak. This was similar for Figures 4 and 5. Figure 6 shows a sample of the final biogas product which is producing methane as shown by the blue circle. Figures 3 through 5 lack a methane peak due to leaks in the biogas system and limited time within testing periods. The hypothesis was proved correct. An innovative, inexpensive, sustainable fuel for cooking and light using an anaerobic digestion system that can be built completely in developing nations such as Honduras was created. The biogas was ignited using a stove which provided heat for cooking. The biogas was not tested using a light; however, since the biogas can burn, this is theoretically possible. The final system achieved these goals.

> 更多