Optimal wavefronts and subwavelength structures : computer-aided design for optics and acoustics
Thesis: Ph. D., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2017.
Materials Literature
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CCDC 1567493: Experimental Crystal Structure Determination
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space grou…
Forced spreading over superhydrophobic and copper surfaces
Dynamic spreading over superhydrophobic and copper surfaces was studied experimentally under the condition of contact line movement with speed greater than 1 mm/sec. Three modes of spreading of distilled water drop over copper surfaces with sufficient typical roughness (0.591, 5.190 and 6.210 μM) were detected. The fi…
Deposition and micro electrical discharge machining of CVD-diamond layers incorporated with silicon
In metal forming, lubricants have to be used to prevent corrosion or to reduce friction and tool wear. From an economical and ecological point of view, the aim is to avoid the usage of lubricants. For dry deep drawing of aluminum sheets it is intended to apply locally micro-structured wear-resistant carbon based coati…
Imaging subcellular structures for biomedical applications
In this talk, I will introduce our very recent advancements of using a variety of molecular- or nanoparticle-based fluorescent probes for visualizing subcellular structures such as plasma membrane, mitochondria, lysosome, and nucleus.
Hydrogen Permeation and TDS Quantification Following Corrosion of Sacrificial Coatings
Cd based sacrificial coatings have wide industrial application for corrosion protection of steel components. However, due to the environmental and health issues associated with them, there is an effort to replace these coatings. Zn-Ni coatings have been studied as probable replacements for Cd coatings. The uptake of h…
Energy based distribution for multi-layer fragmentation
A closed form, energy based statistical model of dynamic fragmentation is presented with application to traditional and multi-layer processes. Modern fragmentation predictive tools generally rely on the Mott & Linfoot distribution 1 alongside the Mott physics-based 2 average fragment size. Multi-layer fragmentation sl…
Plasmonic Color Filters Integrated on a Photodiode Array
Arrayed plasmonic color filters integrated on Si photodiodes with 21 elements were experimentally demonstrated. The plasmonic color filters consisted of nanodot subwavelength periodic structures. Optical characteristics of the color filters were measured and compared with calculated results. In order to obtain spectru…
Analysis of Intergranular Cracking in an Alloy Steel by Hydrogen-Enhanced Decohesion
Hydrogen-enhanced decohesion (HEDE) along an iron GB was calculated from first-principles, together with embrittling solute segregation (Sb, Sn, or P). Using the HEDE calculated under two conditions of constant composition and constant chemical potential for H, the experimentally estimated fracture energy (wf) of H-in…
Geniş tabanlı zirai jantlarda kulak profilinin yorulma ömrüne etkisinin bilgisayar destekli analizi
Bu çalışmada geniş tabanlı zirai jantların istenen yük altında yorulma dayanımı bilgisayar destekli yazılım ile araştırılmıştır. Mevcut jantın istenen taşıma kapasitesini taşıyamayacağı anlaşılmış, ayı iki adet daha jant tasarlanmış ve yapısal analize sokulmuştur. Çıkan sonuçlara göre en uygun jant tasarımı belirlenmi…
Create Molecular Dynamics starting configuration
Little script (relying on GROMACS) to create initial molecular dynamics (MD) boxes. The example attached is for a box of a fullerene derivative, PTEG-1, but the script can be adapted to anything else. See the "a_new_fullerene_box.sh" for some instructions. There is plenty of room for improving the script. The MD files…
CHARACTERISTICS OF RESPONSE OF FLAP GATE TYPE SEAWALL TO WAVES
フラップゲート式防潮堤は，通常地面に倒伏し，津波や洪水による水位変化が生じた場合，その変化に応じて無動力で浮力により扉体が浮上する防災設備である．本設備は，扉体動作を補助するためのカウンターウエイトを備えており，水位変化への追従性を高めている．本研究では，カウンターウエイトを備えた模型と，扉体単体で必要な浮力を有し，底部を単純ヒンジ支持した浮体板とを対象とし，水深と入射波をパラメータとした水理実験を通して波浪に対する扉体の応答性を比較し，作用波圧特性について評価を行った．実験の結果，条件によるものの，カウンターウエイトを搭載した形式は，水位に関わらず一定以上の復元力をカウンターウエイトにより得ているため，一般型と比較して，応答振幅…
Deposition efficiency optimization in cold spraying of metal-ceramic powder mixtures
In the present paper, results of optimization of the cold spray deposition process of a metal-ceramic powder mixture involving impacts of ceramic particles onto coating surface are reported. In the optimization study, a two-probability model was used to take into account the surface activation induced by the ceramic c…
A Brief Survey on Nonlinear Surface Plasmonics
With the rapid development of optical nonlinearities, the study of nonlinear surface plasmonics becomes more popular. Due to the huge potential application value of surface plasmonics, lots of researches in this field become the hotspot. This paper reviewed the history and basic researches of nonlinear plasmonics and…
Quantum Dots and Perovskites – Realizing the Best of Both Worlds for Revolutionary Optoelectronic Applications
We demonstrate QD photovoltaic cells made from CsPbI3 colloidal nanocrystals with an open-circuit voltage of 1.23 volts and power conversion efficiency of 13.4%. Despite very little research on this specific material system to date, the performance surpasses that of any other QD solar cell. This new material system ha…
Experimental Study on the Influence of Pulse Load on Micro - grid Operating Characteristics
The structure of Pulse load is complicated and the load characteristics is closely related to the work mode, in order to study the micro grid operation characteristics under pulse load and the different parameters of pulse load on the influence of the micro grid operation characteristics. This paper built a test syste…
Technical description of WtE(waste to energy) facility inDonetsk, Ukraine
The main objective of this thesis project is to analyze some selected aspects of the feasibility study done in connection with the planning of a new WtE (waste-to-energy) facility in the city of Donetsk, Ukraine. The report pictures the present situation in Donetsk, existing infrastructure and national regulations, se…
Energetska sanacija kmečke hiše
Diplomsko delo predstavlja nacin, kako sanirati neko hiso. Diplomsko delo je razdeljeno na dva dela: teoreticni del in prakticni del. Prvi del poda informacije o standardih, ki jih moramo izpolniti, da bi lahko hiso uvrstili med pasivno gradnjo. Drugi del diplomskega dela je prakticen. V njem je predstavljen sedanji v…
Mixed Mode Fracture Toughness Testing of Hydrogen-Charged 21Cr-6Ni-9Mn Stainless Steel and 2219 Aluminum
Safe design of structural components requires an understanding of mixed-mode loading effects on crack initiation and propagation. Symmetric four-point bending (S4PB) and anti-symmetric four-point bending (AS4PB) were applied to assess the coupled effect of hydrogen and mixed mode I/II loading on crack initiation and p…
Large scale applications of 2D materials for sensing and energy harvesting
Thesis: S.M., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 2017.