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Title          
 A report discussing critical factors affectin...  
 
Abstract    
 Various researches have tried to determine the factors that are responsible for a successful project. The purpose of this paper is to explore the critical factors affecting project performance and develop a framework for measuring success of construction projects. In this paper, a set of key performance indicators (KPIs), namely planning and control, procurement, time, cost, quality and environmental performance are identified as crucial to project performance amongst many others. The importance and the limitations of the suggested KPIs are discussed. The validity of the proposed KPIs is also tested by three case studies. Recommended solutions targeting each area of concern from lessons learnt in the case studies provide a basis for improved project management for large scale projects. With the development of KPIs, a benchmark for measuring the performance of a construction project can be set.
 
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Added By - Arpita Ghosh
Subject - Architecture
Document Type - Assignment
 
   
   

 

Title          
 Rayleigh criteria and Combustion Instability  
 
Abstract    
 A short literature review on Rayleigh's Criteria is provided. This criteria is widely used in mechanical and aerospace engineering areas to understand the phenomena of combustion instability. In continuously running combustion systems where combustion occurs inside a volume of relatively low losses, small amplitude pressure disturbance and small amplitude heat release fluctuations can couple with each other in a positive feedback loop leading to very large amplitude pressure oscillations often ending up in limit cycle oscillations. Such oscillations are detrimental to the combustion system (power or propulsion) for it exposes the system to large mechanical fatigue, thermal loads and can lead to catastrophic failures.
 
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Added By - A Ghosh
Subject - Aeronautics and Astronautics
Document Type - Literature Review
 
   
   

 

Title          
 Adaptive Equalization Techniques using Least ...  
 
Abstract    
 Adaptive equalization is the technique used to reliably transmit data through a communication channel. Ideally, if the channel is ideal (without and channel distortion and additive noise), we can demodulate the signal perfectly at the output without causing any error. However, in practice, all the channels are non-ideal and noisy in nature. So, to recover the original signal after demodulation, our aim is to find an equalization filter which will minimize the error between original transmitted signal and demodulated signal passed through equalization filter. Several algorithms like Least Mean Square (LMS), Recursive Least Mean Square (RLMS), Normalized Least Mean Square (NLMS) etc., has been proposed to perform this operation of equalization. In this project, we study the adaptive equalization technique with the use of least mean Square algorithm.
 
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Added By - ravigarg
Subject - Electrical Engineering
Document Type - Term Paper
 
   
   

 

Title          
 Girlkultur – Mass Culture in Weimar Germany  
 
Abstract    
 In the 1920s, mass culture in Germany came to be broadly described as Girlkultur, which can be translated as "Girl Culture". This was largely characterized by lavish shows known as revues, with themes usually involving women and often inspired by a curiosity of foreign lands. The article also explores how this culture was shaped and driven by rapid industrialization and the emergence of a new urban lifestyle.
 
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Added By - daanish
Subject - History
Document Type - Assignment
 
   
   

 

Title          
 Adaptive Equalization Techniques using Recurs...  
 
Abstract    
 In this project, we extend the use of methods of least squares to find a recursive algorithm solution of adaptive transversal filter. Given the LS solution at any time instant n-1, we find the solution at time n recursively using past solution and newly arrived data. This algorithm is known as Recursive Least Squares (RLS) algorithm. We show the convergence rate of RLS algorithm is faster than LMS algorithm by comparing the learning curves of two algorithms for specified channel response.
 
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Added By - ravigarg
Subject - Electrical Engineering
Document Type - White Paper
 
   
   

 

Title          
 A Technical Essay on the Gyroplane  
 
Abstract    
 A study of “Gyroplane” and its historical evolution, general characteristics, flight characteristics, various designs, potential applications and aerodynamics explaining its flight is attempted. “Gyroplane” is an official term designated by the Federal Aviation Administration (FAA) describing an aircraft that gets lift from a freely turning rotary wing, or rotor blades, and which derives its thrust from an engine-driven propeller. The focus is on highlighting the differences between a Gyroplane and a conventional helicopter, relative merits and demerits and to trace the development to helicopters from autogiros. What lies ahead in the future for gyroplanes is also discussed.

Cierva thought of designing a flying machine that remains stable, safe and controllable irrespective of its forward speed. He segregated the function of lift and forward propulsion, where the former was done by a freely rotating rotor (and not wings) and latter by a conventional pusher or tractor engine.The rotor of an Autogiro (term coined and patented by Cierva) always works in a state of autorotation and a small upward flow is sufficient to rotate the disk. Thus, as long as the machine has forward motion the rotor would produce sufficient lif...
 
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Added By - anandsaxena
Subject - Aeronautics and Astronautics
Document Type - White Paper
 
   
   

 

Title          
 Laminar Separation Bubble  
 
Abstract    
 This essay focuses on the phenomenon of Laminar Separation Bubble observed at Low Reynolds Numbers. The effect of this bubble on the airfoil characteristics is discussed. Airfoils used at low Reynolds numbers have to be designed taking into consideration the finite space and time occupied by the bubble. Active as well as passive mechanisms to control/delay the formation of the bubble are also mentioned.

For conventional aircraft wings, whose Reynolds number exceeds a million, the flow is typically turbulent with the boundary layer able to strengthen itself by ‘mixing’. Consequently flow doesn’t separate until high angles of attack are encountered. For lower Reynolds numbers, the flow is initially laminar and is prone to separate even under mild adverse pressure gradient. Under certain flow conditions, the separated flow reattaches and forms a Laminar Separation Bubble (Fig. 1) while transitioning from laminar to turbulent state. Laminar separation bubble could modify the effective shape of the airfoil and consequently influence the aerodynamic performance, generally in a negative manner.

The need to understand low Reynolds number (104 to 106) aerodynamics is driven by variety of applicat...
 
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Added By - anandsaxena
Subject - Aeronautics and Astronautics
Document Type - White Paper
 
   
   

 

Title          
 Experimental Study of Compressible Pipe Flow ...  
 
Abstract    
 
Anna Ekblom Johan Gullman-Strand's (KTH Sweeden) work on compressible pipe flow with friction and heat addition. The aim of the presented work was to compare existing theoretical analysis with experimental results in the feld of compressible pipe ow in a straight circular pipe with constant cross section area subjected to wall friction and heat addition. The equations describing pipe ow subjected to friction have been rederived. Two different models have been compared. The experiments were conducted on four pipes differing in length and friction factor.Quantities such as total inlet pressure, total inlet temperature, static pressure distribution along the pipe, venturi nozzle pressure difference, power added, outlet dynamic pressure distribution and outlet total temperature have been measured in order to determine the dependence on heat addition and friction. There was no apparent effect of heating on the flow eld though the input power was entirely transfered to the ow. The inuence of friction seems to have the predicted effect, since the achieved outlet Mach numbers were similar for all four pipes for similar input conditions. Inn contrast to the theoretical model of one-dimensional ow, the outlet Ma...
 
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Added By - autocrawler
Subject - Mechanical Engineering
Document Type - MS Thesis
 
   
   

 

Title          
 NOTAR Helicopter  
 
Abstract    
 The NOTAR (no tail rotor) patent is an anti-torque system replacement for helicopter tail rotors with a standard configuration. Production models that are currently available with the NOTAR system are the MD Explorer, MD 600N, and the MD 520/530N. This unconventional system implements circulation control around the tail boom (Coanda effect) that allows the tail boom to act as a wing that produces lateral lift allowing the helicopter to hover. Circulation control is being used extensively for improving the aerodynamic characteristics of rotorcraft airfoils. Some benefits of circulation control have increased the lift to drag ratio and lowered the drag coefficient. The absence of a tail rotor is very beneficial for many reasons. While on the ground, there is no invisible tail rotor disk that ground personnel or (de)boarding passengers can walk into. While in hover, trees are of no concern for the rotor-less tail boom. The NOTAR system is not as susceptible as a tail rotor to foreign object interference, such as rocks or other thrown projectiles. NOTAR helicopters have decreased decibel (db) output, and have reasonable maintenance requirements. This paper will give a brief overview of the circulation control technology used on the NO...
 
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Added By - hareen
Subject - Aeronautics and Astronautics
Document Type - Assignment
 
   
   

 

Title          
 Quasi-one-dimensional models for glassy dynam...  
 
Abstract    
 
We describe analytical calculations and simulations of the quasi-one-dimensional (Q1-D) model for glassy dynamics. In the Q1-D models, hard rods undergo single-file diffusion through a series of narrow channels connected by J intersections. The topology of the model is specified by J, the maximum number of rods in each middle channel K, and the number of rods N. We assume that the rods cannot turn at the intersections, and thus there is a single, continuous route through the system. This model displays hallmarks of glassy dynamics including caging behavior and subdiffusion, rapid growth in the structural relaxation time, and collective particle rearrangements.The analytical calculations are supported quantitatively by Monte Carlo simulations.
 
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Added By - A Ghosh
Subject - Physics
Document Type - PhD Thesis
 
   
   

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