Materials Literature
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El desarrollo de este proyecto es el diseno de equipos para la deshidratacion de alfalfa en fibras largas, teniendo un flujo promedio de alfalfa de 500 kg/h. donde se busca disminuir la humedad desde 46% hasta 13%, esto debe ser en un tiempo minimo con el fin de reducir altamente las degradaciones de vitaminas y prote…
Accurate high-temperature thermophysical property data for liquid metals and alloys are important for simulation of laser-based 3D printing processes. To understand and better control such additive manufacturing processes, knowledge of density, viscosity, and surface tension of liquid metals and alloys versus composit…
Attempts to prepare Gd$_{12}$Co$_{5}$Bi, a member of the rare-earth (RE) intermetallics RE$_{12}$Co$_{5}$Bi, which were identified by a machine-learning recommendation engine as potential candidates for thermoelectric materials, led instead to formation of the new compound Gd$_{12}$Co$_{5.3}$Bi with a very similar com…
Confined water can have properties dramatically different from bulk water, and these properties can be used to develop unique functionality at the nanoscale. For example, fast water transport, rotation-translation coupling, and fast rotationalmotion have been observed in graphitic carbon-based nano structures, which e…
Porous silicon (PSi) is a versatile optical material that is formed by electrochemically etching bulk Silicon (Si). The refractive index of PSi is readily modulated by the electrochemical current density, making PSi inherently applicable to gradient refractive index (GRIN) applications. A GRIN broadly refers to a spat…
Owing to several favorable properties such as phototoxicity combined with tumor accumulation and low dark toxicity, porphyrinic compounds have been playing an important role as photosensitizers in photodynamic therapy (PDT) for a long time. However, most porphyrinic photosensitizers exhibit low solubility in biologica…
Wydawnictwo SIGMA-NOT wydaje czasopisma fachowe informujące swoich czytelników o najnowszych osiągnięciach naukowych i nowoczesnych rozwiązaniach technicznych w Polsce i na świecie, popularyzuje problemy techniczne oraz poszerza wiedzę i kulturę techniczną.
Wydawnictwo SIGMA-NOT wydaje czasopisma fachowe informujące swoich czytelników o najnowszych osiągnięciach naukowych i nowoczesnych rozwiązaniach technicznych w Polsce i na świecie, popularyzuje problemy techniczne oraz poszerza wiedzę i kulturę techniczną.
In this research, the effects of the engine parameters like compression ratios and steam injection on igniting timing and emission characteristics have been investigated numerically. The in-cylinder temperature and pressure at four different compression ratios have been compared with numerical results, and they show a…
O presente artigo discorre sobre o aco Inoxidavel ASTM A743 Grau CA6NM, utilizado na fabricacao dos Rotores de Turbinas Hidraulicas. O meio de fabricacao comumente utilizado e o mecano-soldado, que gera alteracoes nas propriedades mecânicas do material, podendo ocasionar posteriormente trincas na soldagem, ou mesmo, f…
Annotation. The aim of the article is to illustrate some of the specific features of the method for calculating the limit states of structures in emergency situations. The relevance of research. The standards of design loads and forces encountered in emergency situations shall be considered as incidental, which are ac…
Εθνικό Μετσόβιο Πολυτεχνείο--Μεταπτυχιακή Εργασία. Διεπιστημονικό-Διατμηματικό Πρόγραμμα Μεταπτυχιακών Σπουδών (Δ.Π.Μ.Σ.) “Ναυτική και Θαλάσσια Τεχνολογία και Επιστήμη”
Gradualmente, com o avanço da idade, os tecidos humanos passam por mudanças. Na pele, o envelhecimento ocasiona modificações em suas camadas, desencadeando alterações visíveis como o surgimento de rugas e a perda de elasticidade cutânea. Dentre as alternativas de tratamentos existentes para o envelhecimento, alguns a…
Increasing need for weight reduction to improve fuel efficiency and reduce emissions makes Magnesium alloys ideal candidates for structural applications, notably in transportation. However, limited formability at room temperature along with catastrophic failure after limited necking are among the drawbacks that limit…
RESUMO Foi avaliada a rugosidade superfícial de resinas compostas, antes e após a sua imersão em solução aquosa com diferentes pHs e solução enzimática. Foram confeccionados 60 corpos de prova, 30 para cada material, com auxílio de uma matriz de acrílico com 5mm de diâmetro e 2mm de espessura, as quais foram preenchid…
以碳化硅粉体为载体,葡萄糖、油酸、腐植酸钠等为碳源,采用水热法炭化及400℃低温炭化获得Si C/C材料,继而气相磺化合成了碳基碳化硅核壳固体酸催化剂。采用XRD、IR、XPS、TG、SEM和TEM对催化剂进行了结构表征,酸滴定法测得其酸度为1.33mmo L/g。以其催化苯甲醛和1,3-丙二醇缩合反应为探针反应测试了其催化活性。考察了原料配比、催化剂用量、反应时间及催化剂重复使用性对缩合产率的影响。结果表明,适宜反应条件为：苯甲醛投料量为0.1mol时,催化剂用量为0.075g,醛醇摩尔比1∶1.5,100℃回流2h产率可达83%,该催化剂可以重复使用4次以上。
Resumo O osso é um tecido conjuntivo especializado, vascularizado e dinâmico que se modifica ao longo do organismo. Quando lesado, possui uma capacidade única de regeneração e reparação sem a presença de cicatrizes, mas em algumas situações devido tamanho do defeito ósseo não se regenera por completo. Assim, se faz ne…
Glycoluril is a concave molecule with hydrogen donor and acceptor sites. It can be provided with aromatic side walls to form a molecule with a clip-shape structure. This review highlights the host-guest and self-assembling properties of glycoluril clips and discusses their use as building blocks for the construction o…
This autobiographical chapter covers a 45 year research career, from a PhD on lanthanide shift reagents to molecular knots, via porphyrins, steroids, peptides and aromatic Donor–Acceptor building blocks incorporated into macrocycles and catenanes. Coordination chemistry, non-covalent interactions including π– π and hy…
The widespread use of molecular machines in biology has long suggested that great rewards could come from bridging the gap between synthetic molecular systems and the machines of the macroscopic world. Here we highlight the development of artificial molecular machine systems from the Leigh group, from the serendipitou…