Global ETD Search
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Showing 1 to 20 of 56 for “"Re-entrant"”.
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Simulation of tandem and Re-Entrant manufacturing lines
… finding a way to analyze and improve design. Increasingly complex systems are now being modeled, and two such systems are the focus of this report. The Tandem and Re-Entrant systems allow for multiple part types to be sent through a single line of processing machines. The parts have different …
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Electrical noise studies of the re-entrant spinglass nickel-manganese
"NiMn is known as a re-entrant spinglass. In some range of Mn concentrations it exhibits a transition from the paramagnetic to ferromagnetic states as it cools, and then crosses over into a regime with many magnetic properties similar to a spinglass but with a spontaneous moment. It has often been …
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Analysis of control mechanism in a re-entrant manufacturing system
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1997, and Thesis (M.S.)--Massachusetts Institute of Technology, Sloan School of Management, 1997.
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Behavior and Strength of Simple and Continuous Span Re-Entrant Composite Slabs
… development of the commercially available re-entrant steel deck profile. The effects of various embossments and continuous construction are investigated through three Series of composite slab load tests. The test specimens in this study were constructed to simulate actual field construction …
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Conceptual design for a re-entrant type fuel channel for supercritical water-cooled nuclear reactors
Current CANDU-type nuclear reactors use a once-through fuel-channel with an annulus gas insulating it from the moderator. The current reference design for a CANDU-type SuperCritical Water-Cooled Reactor (SCWR) is to eliminate the annulus gap and use a ceramic insert to insulate the coolant from the …
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Control policies for scheduling of semiconductor manufacturing plants
… manufacturing facilities which can be modeled as re-entrant lines and the stability of such re-entrant lines for several buffer priority and due-date-based policies subject to deterministic bursty arrivals. By stability, we mean that the work-in-process in the system is bounded for all time, or …
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Micro-textured surfaces for omniphobicity and drag-reduction
… the appropriate combination of surface texture and solid surface energy, the liquid may not penetrate into the surface texture. Instead, the droplet sits partially on air, forming a solid-liquid-air composite interface. Entrapped air pockets of the composite interface are known to cause …
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Cálculo de placas com ângulos reentrantes
… orientation in the design of plates with re-entrant angles, with various boundary conditions, which were made of reinforced concrete. A study made of the relation of the sides in the general behaviour of the efforts, and examples of plates with variable bevel, and serrated boundary were …
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Enzyme diffusion and cellulose breakdown in the bioremediation of medical waste
… environmental concern. New disposal methods are currently being investigated; one of these is a bioremediation process which utilizes enzymes in a batch reactor to render the waste noninfectious. The success of this biological process depends on (among other things) two mechanisms: the …
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Design and microfabrication of multifunctional bio-inspired surfaces
… improved, hierarchical multifunctional bioinspired surfaces. Different natural surfaces have been surveyed including well-known lotus leaf, sharkskin, back of the Namib Desert beetle, butterfly wings, and legs of water-walking insects. The lotus leaf features superhydrophobicity, which leads to …
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Experimental investigation of cavitation in a cylindrical orifice
… automotive fuel injectors and agriculture. While, the presence of cavitation in plain orifice atomisers is known to enhance this process, the complex flow mechanisms that result within the nozzle, such as periodic cavitation shedding, are not fully understood. A new cavitation research …
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The relationship between repolarisation alternans and the production of ventricular arrhythmia in heart failure
Microvolt T-wave alternans is thought to predict the risk of ventricular arrhythmias in patients with heart disease, although recent clinical studies have conflicting results. Understanding the cellular basis for alternans may not only inform more effective utilisation of the clinical test, but …
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Aging and Barkhausen noise in the relaxor ferroelectrics
"Relaxor ferroelectrics are disordered crystalline materials whose polar order is limited to mesoscopic-scaled nanodomains. There is no ferroelectric phase transition, but a faster than Arrhenius cooperative freezing into a glassy relaxor regime instead. It is not understood how the random fields …
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Design guidelines of laser structured surfaces for enhanced pool boiling heat transfer
… salient pathway to improve energy efficiency and reduce operating costs. In this work, we strengthen external pool boiling of R-1336mzz(Z) on tube exteriors by optimizing laser texturing recipes. Systematic adjustment of laser parameters enables deterministic control of surface morphology, with …
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Abnormal Grain Growth of Tungsten Carbide in Small Amount of Cobalt: Mechanism and Application
<P>CONSIDERABLE ABNORMAL GRAINS WERE OBSERVED IN LIQUID PHASE SINTERED CEMENTED WC WITH 0.2~0.9WT% COBALT. MICROSTRUCTURE EXAMINATIONS SHOWED GRAIN BOUNDARIES PARALLEL TO (0001) PLANES AND AGG WAS EXPLAINED BY GRAIN BOUNDARY RE-ENTRANT EDGE (GBRE) ASSISTED 2-D NUCLEATION PROCESS. GRAIN COALESCENCE …
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Properties of dirty bosons in disordered optical lattices
The study of the disordered Bose-Hubbard model is key to understanding the interplay of disorder and interactions. Despite many studies with uniform diagonal disorder, few have inquired into experimental realizations with an additional correlated off-diagonal disorder. The presence of a trap and …
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A Study of Instability Mechanisms Driving Cloud Cavitation: Experimental Analysis Using New Advanced Velocimetry and Evaluation of Numerical Models
… and violent collapse of large vapor structures, poses significant risks to the integrity and performance of hydraulic machinery. Despite extensive research, the precise interaction between competing shedding mechanisms, specifically re-entrant jets and condensation shocks, remains a subject …
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Introducing pull methodologies in a semiconductor fab
… manufacturing is a highly complex and re-entrant process. In a fabrication facility, hundreds of decisions are made during a production shift regarding how shared tool capacity will be prioritized. These decisions contribute to how balanced or unbalanced the manufacturing line will be. …
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A critical analysis of the 2H NMR data in chlorhexidine-containing model membranes
Deuterium nuclear magnetic resonance spectroscopy was used to study the in uence of chlorhexidine on the internal molecular motions of phospholipid model membranes. Mixtures of dimyristoylphosphocholine (DMPC) and chlorhexidine (CHX) were investigated at several DMPC:CHX molar ratios …
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Investigation into the Effect of Physical Size on Crack Initiation in Brittle Materials Subject to Mixed Mode Fracture (With Focus on Graphite Nuclear Reactor Cores)
This work explores experimentally and numerically the topic of size effect in simple and complex loading scenarios with a view to determining a suitable fracture prediction criterion for advanced gas-cooled reactor (AGR) graphite bricks. In this context size effect is taken to mean the non-constant …
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