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Evaluation of a fiber optic distributed temperature measurement system for a geothermal energy
As part of the European project GEOTHERMICA - ERA NET and in order to assess the capacity of heat storage in Switzerland, the Centre d'Hydrogéologie et de Géothermie de l'Université de Neuchâtel (CHYN) is taking part in the HEATSTORE project, launched in 2018. The latter is expected to lead to commercial heat storage projects in the near future in Geneva and Bern, in fractured aquifers. The evaluation of the geological characteristics of these aquifers is essential to understand the thermal energy transport processes of fractured aquifers. For this, it is necessary to be able to measure the temperature distribution along boreholes. Thus, the study focuses on the evaluation of a distributed temperature system (DTS) and its optical fiber in order to determine its operation, limits and potential for use in geothermal energy. Laboratory and field tests have been carried out that the water temperature deviation measurements, with a scan time of 30 s, are reliable at less than 0.5°C at +/-5 m over 500 m of fiber. For absolute temperature values, however, a bath and a reference probe must be used to recalculate the absolute temperature to within 0.5°C. The acquired data are essential for a broader understanding of the locations of fractured and karstified aquifers at Concise, allowing the system to be used to better understand the potential for water storage at a depth of 45°C at 35 m.
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Reducibility of Silver ions by the Charcoal: Regarding Mechanisms, Art, and Liquid Waste Management
We elucidated the cause of the phenomenon, in which silver deposits on a bamboo charcoal when the bamboo charcoal is soaked in an AgNO3 water solution. From the experimental results, we considered that the hydrogen which is generated while the bamboo wood is carbonized is chemisorbed as C-H bonds on the surface edge of charcoal (the end of the carbon), and that these hydrogen atoms become hydrogen ions,which then reduce the silver ions and deposit silver. In addition, we created a graph of the mass of deposited silver versus the mass of charcoal, and the graph showed that the mass of deposited silver was strongly correlated with the surface area calculated from the mass of the charcoal. Besides, we showed that charcoal can be used in applications for the treatment of inorganic liquid waste, depositing metals from inorganic liquid waste by bamboo charcoals. Also, the charcoal is used for interior decoration because of its deodorizing effect and beauty. In our study, we create a work of art used silverdeposited charcoal with a motif of Karesansui (Traditional Japanese rock garden).
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Two Games on Graphs Extended from the Game of Squayles
本研究是關於 nim 遊戲的兩種推廣(其中一種是一個稱為 the game of squayles 的遊戲的推廣),稱為 edge-removing game 和 star-removing game。此遊戲為兩人遊戲。在遊戲的一開始,有一個簡單圖 G。兩個玩家輪流刪除該圖的非空路徑或非空星子圖的邊。首先不能移動的一方輸掉遊戲。 在 edge-removing game 中,我成功計算出某些特殊圖的 Grundy numbers,並給出了一般 k 星的 Grundy numbers 上界。接著我定義了一種新的圖,稱為 nice graphs,並發現所有 nice graphs 都是 N-position。我由此給出了任意兩個非空圖的 join product 的解。至於圖的 Cartesian product,我給出了兩個滿足一定條件的非空圖的 Cartesian product 的解,並發現一個 fully nice graph 和任何至少有 2 個頂點的連通圖的 Cartesian product 也是 fully nice 的。使用這個性質,我給出了 r-dimensional grids 上的 edge-removing game 的解。 至於 star-removing game,我最大的突破是構思出對稱性這個概念。使用這個概念,我給出更一般化的結論,可以用來有效分析某些圖的 Cartesian product 上的的 star-removing game。使用這些結果,我給出了 r-dimensional grids 的解。
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Stewart's Theorem的推廣及相關探討
本文主要探討:在頂角為∠A、腰長為 ̅(AB) =l的等腰三角形ABC中,給定t, 滿足(¯PA2-l2)/(¯PBׯPC)=±t的所有P點的軌跡方程式及圖形,我們得知: 一、t=1時,其圖形為直線¯(BC)與△ABC外接圓的聯集。 二、0
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Studies of spatial self-phase modulation of the laser beam passing through the olive oil
橄欖油含有葉綠素a,葉綠素b,和胡蘿蔔素等高熱吸收率的物質;高斯光束照射橄欖油時,橄欖油吸收的熱量,使橄欖油產生溫度梯度和折射率梯度,並產生熱透鏡(Thermal lens)和自調相(Self-phase modulation)現象。 以雷射光照射盛橄欖油水平置放的方型盒時,中央軸的照度最大,橄欖油的溫度最高,折射率和密度最小。由於對流作用的影響,使得光束照射到的橄欖油的上半部折射率梯度小於下半部;光束通過橄欖油後,在屏幕上出現的繞射圖樣呈現上半部的亮帶半徑小於下半部。 將橄欖油改置圓柱筒中,雷射光由上向下照射,可以消除熱對流現象。用不同功率的雷射,照射不同液柱高度,和不同熱吸收率的橄欖油;探討功率、液柱高度、和熱吸收率對:繞射亮帶最大半徑、繞射亮帶半徑隨時間的變化、和亮帶數目的影響。
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An Efficient and Accurate Super-Resolution Approach to Low-Field MRI via U-Net Architecture With Logarithmic Loss and L2 Regularization
Low-field (LF) MRI scanners have the power to revolutionize medical imaging by provid- 27 ing a portable and cheaper alternative to high-field MRI scanners. However, such scanners are usu- 28 ally significantly noisier and lower quality than their high-field counterparts. This prevents them 29 from appealing to global markets. The aim of this paper is to improve the SNR and overall image quality of low-field MRI scans (called super-resolution) to improve diagnostic capability and, as a result, make it more accessible. To address this issue, we propose a Nested U-Net neural network architecture super-resolution algorithm that outperforms previously suggested super-resolution deep learning methods with an average PSNR of 78.83 ± 0.01 and SSIM of 0.9551 ± 0.01. Our ANOVA paired t-test and Post-Hoc Tukey test demonstrate significance with a p-value < 0.0001 and no other network demonstrating significance higher than 0.1. We tested our network on artificial noisy downsampled synthetic data from 1500 T1 weighted MRI images through the dataset called the T1- mix. Four board-certified radiologists scored 25 images (100 image ratings total) on the Likert scale (1-5) assessing overall image quality, anatomical structure, and diagnostic confidence across our architecture and other published works (SR DenseNet, Generator Block, SRCNN, etc.). Our algo- rithm outperformed all other works with the highest MOS, 4.4 ± 0.3. We also introduce a new type of loss function called natural log mean squared error (NLMSE), outperforming MSE, MAE, and MSLE on this specific SR task. Additionally, we ran inference on actual Hyperfine scan images with successful qualitative results using a Generator RRDB block. In conclusion, we present a more ac- curate deep learning method for single image super-resolution applied to low-field MRI via a 45 Nested U-Net architecture.
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「磁」「明」無雙 — 磁性碘氧化鉍可見光光觸媒對淨水效率之研究
本研究成功以不同化學方法自製磁性奈米粒子,並利用水熱法(Solvothermal)合成可見光光觸媒碘氧化鉍(Bi4O5I2),再以不同比例複合出具磁性的光觸媒,藉由光降解結晶紫(Crystal Violet)染料實驗探討分解染料效率最佳之複合樣本,其最佳樣本為Bi4O5I2 -Fe3O4-90 %,反應速率常數達0.1118 h-1,並運用一系列儀器檢測其特性並探討其與光催化效率之關聯性。此外,針對觸媒在生活中的應用性探討,在生活不同水質、極端pH值或是高濃度之有機汙染物均仍保持良好的降解效率,並以Arduino開發板搭配各項組件模擬小型淨水場,以達到自動化降解有機汙染物。另外,利用自製紫外光照光裝置模擬捕捉CO2之光催化反應,並使用Arduino開發板之氣體偵測器確認生成化石燃料作為未來展望目標。
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探討半乳糖凝集素-4在腸道沙門氏菌感染中扮演的角色
此研究旨在探討當腸道沙門氏菌感染人類腸道上皮細胞(HT-29)時半乳糖凝集素-4(galectin-4)所扮演的角色。我們用野生型(wild-type)以及半乳糖凝集素-4 剔除(galectin-4 knockout)的HT-29細胞進行沙門氏菌感染。我們首先經由CFU計數探討galectin-4對細胞內細菌量的影響,並檢測細胞釋出的LDH及IL-18和mature caspase-1的量,以此研究galectin-4是否會活化發炎體(inflammasome)。結果發現, wild type HT-29 cells相較galectin-4 knockout cells有較少的活細菌,釋出的LDH,IL-18也較少。但在經過wortmannin(一種自噬抑制劑)treatment後,wildtype HT-29 cells釋出較多的LDH,IL-18,並且也釋出了mature caspase-1。這些研究結果顯示galectin-4能夠降低細胞內活細菌的量,且能夠活化inflammasome。
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Analysis on a New Electric Field Measurement Method Using Ionic Propulsion Propeller
Given the high sensitivity of electronic instruments, electromagnetic field intensity measuring is now becoming an essential part of the industry. Current electric field intensity meters are unfit for individual use and focus mainly on electromagnetic radiation rather than the field itself. In ionic propulsion, the propulsion force is proportional to electric field intensity but the use of this property on measurement remains largely unexplored. Here, our team investigates ionic propulsion in electric fields generated by electro-static methods and then systematically varies the point of measurement inside the field, thereby altering the intensity of the field without focusing on electromagnetic radiation. By combining the Van de graaff generator with an adjustable ionic thrust propeller, we find that the propeller speed which is proportional to the electric field is directly determined by the electric field intensity. Furthermore, we applied stroboscopy to the system to measure RPM, and have achieved the direct interaction between field intensity and RPM, which could be a new meter for field intensity measurement.
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活化石海百合Comanthus parvicirrus所含化學物質探討
本研究針對臺灣恆春半島海域所採集的棘皮動物海百合小卷海齒花Comanthus parvicirrus進行天然物化合物之成分研究,分離獲得三個角型萘並吡喃酮類型天然化合物,包括一個新化合物8-hydroxy-5,6,9,10-tetramethoxy-2-methyl-4H-benzo[h]chromen-4-one (1)以及兩個已知化合物comaparvin (2)與6-methoxycomaparvin-5-methyl ether (3)。上述化合物結構是由核磁共振儀、紅外線光譜儀、紫外光可見光譜儀、x-ray光譜儀和質譜儀等數據,以及比對相關化合物的文獻來分析確認。 化合物1-3進行體外抗發炎活性測試,並且探討化合物對脂多糖 (lipopolysaccharide, LPS) 誘發的小鼠巨噬細胞 (RAW264.7) 所產生的發炎性蛋白質一氧化氮合成酶 (iNOS) 以及第二型環氧化酶 (COX-2)。
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Discussion for Titanium Peroxides and Their Application for Dealing with Zombie Shrimp Issue
Food safety was an important issue recently. Today sodium percarbonate was used to fake the vitality of shrimps to earn a good sell. However, it may cause harm to health because of the peroxides left over. To handle this problem, we set up two goals to achieve: detecting them and then removing them. In the past, the titration skill was an easy method for determining the concentration of H2O2. It not only spent too much time but also resulted in errors commonly. In this research, titanium sulfate and citric acid were used to prepare the colorimetric reagent. To measure the peroxides in water, several factors were controlled and the SOP for detecting and the calibration line for peroxides finally established. In practical, we turned the colorimetric reagent into the fast test paper which was easily for use. The other part of this research was to clear up the peroxides in water. We use titanium sulfate, hydrogen peroxide and citric acid as starting material via hot-bath method to prepare the nano-photocatalyst of titanium dioxide. Since the powder was inconvenient to deal with large amount of water. The powder-like TiO2 was further made into ball-shaped TiO2 in favor of water treatment and reuse. It was found that the photocatalytic performance of ball-shaped TiO2 was effective to be on duty for removal of the peroxides. In summary, this research provided two techniques to deal with the zombie shrimp. The novel method for synthesis of TiO2 catalyst and the preparation of colorimetric reagent for fast test paper were all in low cost. They had great potential to develop in marketing demand.
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