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The module provides a grounding in control systems modelling and analysis, using engineering mathematical techniques. It concludes with the examples of control systems design, underpinned by the modelling and analysis that precedes and informs the design. Syllabus: Control systems: what they are, examples of control systems, open-loop and closed-loop control systems, block diagrams of continuous (analog) and discrete-time (digital) control systems, system equations, differential equations, difference equations, linear and non-linear systems, free response, forced response, total response, steady state and transient responses, second-order systems, linearity and superposition, Laplace transform and its inverse , properties of Laplace transform, pole-zero mapping, application of Laplace transform to model systems, Routh-Hurwitz stability criterion, transfer functions and properties, analysis and design of feedback control systems, Bode analysis and design, Root-locus analysis and design, steady-state error analysis, introduction to advanced topics in control systems.
The project consists of an individual piece of work, under the supervision of an academic member of staff. It can take either one, or a combination, of the following forms: (i) an experimental investigation; (ii) a computational exercise; (iii) the development of a piece of experimental apparatus; (iv) a design study; (v) a theoretical analysis; (vi) a review of a topic of current interest. Not open to Associate Students.
NUS Graduate School for Integrative Sciences and …
Biggest limit of this car, imho, is the maximum power in EV only mode, which is limited to 60kW. If you want all the 120kW, you need the help of the ICE. Really missing some kind of supercapacitors for surges of power, like when overtaking.
Wisam J. Khudhayer obtained his PhD degree from University of Arkansas at Little Rock (USA) in 2011. He is currently assistant professor in the department of energy engineering at university of Babylon (IRAQ) and serving as assistant dean for scientific affairs in the college of engineering / Al-Musayab. Wisam is also a board member of directors of the state company for automobile industry / Alexandria (IRAQ). Six months research work at Washington University in St. Louis (USA) (2006) and three months Graduate Assistant (GA) in Graduate Institute Technology (GIT) at University of Arkansas (2011). His research work focused on the application of nanomaterials in heat transfer, renewable energy (fuel cells), and material science and engineering fields. He published about 28 papers in reputed journals, participated in more than 20 international conferences, supervised three M. Sc students, and his h-index is 7 based on thomson routers and scopus databases. Wisam obtained many national and international awards such as 1st Place Award of Talented Iraqi Student Competition in the field of chemical engineering 2002, "Marquis Who's Who in the America' among Students in American Universities and Colleges in recognition of outstanding merit and accomplishment as a student at University of Arkansas at Little Rock (UALR) 2011, Nominated for Future Energy Leaders’ programme (FEL-100) 2016, and Nominated and elected for Marquis Who is Who in the World 2018.
Faculty - Department of Physics - Sharif
I am considering building a supercritical dryer to research aerogel applications as biomedical scaffolds. Are there any aerogels that you know of to be safe even when inside the human body? They would need to be non-toxic and generally not dissolve in water (though I’m intrigued about the possibility of a slowly dissolving aerogel). And, as I’m no chemistry buff, what kinds of materials can aerogels be made out of? In other words, what are the limitations in terms of what can be used?
1. To make silica aerogels, compounds such as tetramethoxysilane, tetraethoxysilane, or sodium silicate are used since they can make silica gels when reacted with other substances such as water and acids.
2. Silica aerogels are certainly the most common type made. Chalcogels are NOT a commonly made type of aerogel, only a few groups work with these. This is what we call Wikipedia bias. The thing these two classes of materials have in common is that they both start out as wet gels,but the chemistry to make those gels is pretty different. In general, to make a gel, you need reactive monomers or nanoparticles that can polymerize and/or agglomerate together to form a gel. Once you’ve got a gel, you can dry that gel to make an aerogel!
3. Hydrophilic aerogels are what typically result from preparing silica aerogels by low-temperature CO2 drying. They are hydrophilic (water-loving) because they have hydroxyl groups on their skeletal surfaces that water loves to stick to (because they look like water). Hydrophobic aerogels result from replacing these hydroxyl groups with something that repels water, like a methyl group (-CH3) or a trimethylsilyl group (-Si(CH3)3). This can be done by treating the wet gel with special waterproofing chemicals before supercritical drying, by supercritically drying the aerogel at high temperatures in methanol, or by post-treating the supercritically dried aerogel with a reactive chemical.
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Technique, Engineering, Physics & Chemistry - …
4) You should place the gel under ethanol in the reactor but you should remove all of it before trying to do supercritical drying! Remember, there are two processes going on in the reactor–first, a solvent exchange of ethanol with liquid CO2 and second supercritical extraction. You need to drain/vent the ethanol from the vessel, refill with liquid CO2, let the gel soak in CO2 for a day or so, repeat 2-3 more times, then if you aren’t smelling ethanol in the exhaust and seeing ethanol leftover after the dry ice sublimes, then you are go for supercritical drying.
Master of Information Technology (C6001) - …
Zeolitic imidazolate frameworks (ZIFs), a subclass of metal-organic frameworks (MOFs), havebeen recently employed in various fields such as gas separation, catalysis, water purification anddrug delivery.1 Their high importance is due to their chemical and thermal stability in addition tothe flexibility of their design. ZIFs have been synthesized solvothermally or at room temperatureusing organic solvents (e.g. methanol, DMF) or pure water.2 The control of size and morphologyof crystals has been achieved using reverse microemulsion methods, microwave, ultrasoundassistedsyntheses and coordination modulation methods.1-3 Herein, we investigate a newsynthesis method where ZIF crystals are produced using the reaction-diffusion framework (RDF)in a gel medium at room temperature. The method is based on the diffusion of an outer solutionof the organic linker or mixed linkers into an agar gel containing the inner metal ions Zn(II)and/or Co(II) where a precipitation reaction takes place leading to the formation of the ZIFcrystals. A propagating supersaturation wave, initiated at the interface between the outer solutionand the gel matrix leads to a precipitation front endowed with a gradient of crystal sizes rangingbetween 100 nm and 55 μm along the same reaction tube. While the precipitation fronts of ZIF-8 and ZIF-67 travel the same distance for the same initial conditions, ZIF-8 crystals therein areconsistently smaller than the ZIF-67 crystals due to the disparity of their rate of nucleation andgrowth. The effects of temperature, the concentration of the reagents, and the thickness of thegel matrix on the growth of the ZIF crystals are investigated. We also show that by using RDF,we can envisage the formation mechanism of the ZIF crystals, which consists of the aggregationof ZIF nanospheres to form the ZIF-8 dodecahedrons. Moreover, using RDF the formation of asolid-solution ZIF via the incorporation of Co(II) and Zn(II) cations within the same frameworkis achieved in a controlled manner. Finally, we demonstrate that doping ZIF-8 by Co(II)enhances the photodegradation of methylene blue dye under visible light irradiation in theabsence of hydrogen peroxide.
Program | 6th World Congress and Expo on …
3)how long each washing step (with CO2,non-super critical) should take?
a-should depressurzing of these washing steps be as slowly as depressurezing of the supercritical step?
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