scholarly journals FPGA-Based Synthesis of High-Speed Hybrid Carry Select Adders

2015 ◽  
Vol 2015 ◽  
pp. 1-13 ◽  
Author(s):  
V. Kokilavani ◽  
K. Preethi ◽  
P. Balasubramanian
Keyword(s):  
High Speed ◽  
Boolean Logic ◽  
The Other ◽  
Square Root ◽  
Verilog Hdl ◽  
Other Hand ◽  
Carry Select Adder

Carry select adder is a square-root time high-speed adder. In this paper, FPGA-based synthesis of conventional and hybrid carry select adders are described with a focus on high speed. Conventionally, carry select adders are realized using the following: (i) full adders and 2 : 1 multiplexers, (ii) full adders, binary to excess 1 code converters, and 2 : 1 multiplexers, and (iii) sharing of common Boolean logic. On the other hand, hybrid carry select adders involve a combination of carry select and carry lookahead adders with/without the use of binary to excess 1 code converters. In this work, two new hybrid carry select adders are proposed involving the carry select and section-carry based carry lookahead subadders with/without binary to excess 1 converters. Seven different carry select adders were implemented in Verilog HDL and their performances were analyzed under two scenarios, dual-operand addition and multioperand addition, where individual operands are of sizes 32 and 64-bits. In the case of dual-operand additions, the hybrid carry select adder comprising the proposed carry select and section-carry based carry lookahead configurations is the fastest. With respect to multioperand additions, the hybrid carry select adder containing the carry select and conventional carry lookahead or section-carry based carry lookahead structures produce similar optimized performance.

Aeroelastic Problems in connection with High-Speed Flight

1956 ◽  
Vol 60 (547) ◽  
pp. 459-475 ◽  
Author(s):  
E. G. Broadbent
Keyword(s):  
Mach Number ◽  
High Speed ◽  
The Other ◽  
Control Surface ◽  
The Past ◽  
Other Hand ◽  
Aerodynamic Derivatives ◽  
Mach Numbers ◽  
The One

SummaryA review is given of developments in the field of aeroelasticity during the past ten years. The effect of steadily increasing Mach number has been two-fold: on the one hand the aerodynamic derivatives have changed, and in some cases brought new problems, and on the other hand the design for higher Mach numbers has led to thinner aerofoils and more slender fuselages for which the required stiffness is more difficult to provide. Both these aspects are discussed, and various methods of attack on the problems are considered. The relative merits of stiffness, damping and massbalance for the prevention of control surface flutter are discussed. A brief mention is made of the recent problems of damage from jet efflux and of the possible aeroelastic effects of kinetic heating.

GMS Economic Corridors Under the Belt and Road Initiative

2019 ◽  
Vol 1 (2) ◽  
pp. 183-206
Author(s):  
Masami Ishida
Keyword(s):  
High Speed ◽  
Yunnan Province ◽  
Lao Pdr ◽  
The Other ◽  
Transport Infrastructure ◽  
Belt And Road Initiative ◽  
Other Hand ◽  
Belt And Road ◽  
The Government ◽  
The Belt And Road

The government of China promotes the development of expressways and high-speed expressways in Greater Mekong Subregion (GMS) and tries to connect the major cities of the subregion and Kunming under the Belt and Road Initiative (BRI). First, this article reviews the development schemes in the subregion including GMS economic cooperation and the BRI. Next, it introduces the development of the transport infrastructure, including expressways and high-speed railways, connecting Kunming and Lao People’s Democratic Republic (Lao PDR), Thailand, Myanmar and Vietnam. Thereafter, it compares the total costs of the projects and how other GMS countries negotiate with China. Seeing the sections of the expressways and railways in Yunnan Province, the shares of some sections occupied by bridges and tunnels are higher than 20 per cent due to the mountainous land feature of Yunnan Province. On the other hand, the railway in Lao PDR passes through the mountainous areas, and they adopted higher specification as same as in Yunnan Province. Consequently, the debt-default risk of Lao PDR has increased. On the other hand, Thailand repeated tough negotiations with China and made efforts not to increase the total cost. The negotiations of Lao PDR and Thailand with China are illustrated in this article. JEL Codes: O18, R10, R41, R58

Quantitative E-beam Probe for Valid High-Speed Measurements

1999 ◽  
Author(s):  
C. T. Salling
Keyword(s):  
Measurement Error ◽  
Transient Response ◽  
High Speed ◽  
Sampling Time ◽  
The Other ◽  
Other Hand ◽  
Timing Measurement ◽  
Time Accuracy ◽  
Accuracy And Repeatability ◽  
Measurement Capabilities

Abstract This paper presents the results of a study to assess the timing measurement capabilities of e-beam probes and how they compare to mechanical probes in terms of sampling time, accuracy, and repeatability. Analysis of the data indicates that the transient response of mechanical probes is prone to overshoot and ringing, which contributes significantly to measurement error and uncertainty. E-beam probes, on the other hand, are subject to charging effects and interference which, as the authors show, can be effectively eliminated, facilitating high-speed timing measurements accurate to within a few picoseconds.

scholarly journals A Mechanically Checked Proof of IEEE Compliance of the Floating Point Multiplication, Division and Square Root Algorithms of the AMD-K7™ Processor

1998 ◽  
Vol 1 ◽  
pp. 148-200 ◽  
Author(s):  
David M. Russinoff
Keyword(s):  
Register Transfer Level ◽  
The Other ◽  
Floating Point ◽  
Square Root ◽  
Rigorous Proof ◽  
Point Multiplication ◽  
Logical Operations ◽  
Other Hand ◽  
Ieee Standard ◽  
Proof Of Correctness

AbstractWe describe a mechanically verified proof of correctness of the floating point multiplication, division, and square root instructions of the AMD-K7 microprocessor. The instructions are implemented in hardware and represented here by register-transfer level specifications, the primitives of which are logical operations on bit vectors. On the other hand, the statements of correctness, derived from IEEE Standard 754, are arithmetic in nature and considerably more abstract. Therefore, we begin by developing a theory of bit vectors and their role in floating point representations and rounding. We then present the hardware model and a rigorous proof of its correctness. All of our definitions, lemmas and theorems have been formally encoded in the ACL2 logic, and every step in the proof has been mechanically checked with the ACL2 prover.

Research on the Grinding Force of the Basin-Like Grinding Wheel in Grinding Elliptical Grooves of Outer Race

2013 ◽  
Vol 823 ◽  
pp. 143-148
Author(s):  
Xiao Xue Li ◽  
Jun Ming Wang ◽  
Yu Qin Sun ◽  
Zhen Gang Gao
Keyword(s):  
High Speed ◽  
Grinding Force ◽  
The Other ◽  
Grinding Wheel ◽  
Grinding Process ◽  
Feed Velocity ◽  
Outer Race ◽  
Abrasive Grains ◽  
Other Hand

In order to calculate the grinding force of the basin-like grinding wheel in grinding outer race elliptical grooves, the thesis simplifies the grinding process as follow: the evenly distributed abrasive grains move around grinding wheel axis along an imaginary ellipse at high speed, while the imaginary ellipse moves along the trace deflected from the grinding wheel axis simultaneously. The analysis of grinding force in CVJ outer race elliptical groove grinding with basin-like grinding wheel reveals that, the grinding force will be decreased, if wheel velocity increased and feed velocity decreased. On the other hand, with the decrease of inter-grain spacing, the grinding force of basin-like grinding wheel will be increased, but the grinding force of abrasive grit will be decreased.

scholarly journals Design of Carry Select Adder using BEC and Common Boolean Logic

2022 ◽  
pp. 5-9
Author(s):  
Syed Mustafaa M ◽  
◽  
Sathish M ◽  
Nivedha S ◽  
Magribatul Noora A K ◽  
...  
Keyword(s):  
Power Consumption ◽  
Dynamic Method ◽  
Boolean Logic ◽  
Square Root ◽  
Large Area ◽  
Carry Select Adder ◽  
Great Scope

Carry Select Adder (CSLA) is known to be the fastest adder among the conventional adder structure, which uses multiple narrow adders. CSLA has a great scope of reducing area, power consumption, speed and delay. From the structure of regular CSLA using RCA, it consumes large area and power. This proposed work uses a simple and dynamic Gate Level Implementation which reduces the area, delay, power and speed of the regular CSLA. Based on a modified CSLA using BEC the implementation of 8-b, 16-b, 32-b square root CSLA (SQRT CSLA) architecture have been developed. In order to reduce the area and power consumption in a great way we proposed a design using binary to excess 1 converter (BEC). This paper proposes an dynamic method which replaces a BEC using Common Boolean Logic.

scholarly journals An invariant of finitary codes with finite expected square root coding length

2010 ◽  
Vol 31 (1) ◽  
pp. 77-90 ◽  
Author(s):  
NATE HARVEY ◽  
YUVAL PERES
Keyword(s):  
Markov Chains ◽  
Marginal Distribution ◽  
Bernoulli Shift ◽  
The Other ◽  
Square Root ◽  
Other Hand ◽  
Lower Moment

AbstractLet p and q be probability vectors with the same entropy h. Denote by B(p) the Bernoulli shift indexed by ℤ with marginal distribution p. Suppose that φ is a measure-preserving homomorphism from B(p) to B(q). We prove that if the coding length of φ has a finite 1/2 moment, then σ2p=σ2q, where σ2p=∑ ipi(−log  pi−h)2 is the informational variance of p. In this result, the 1/2 moment cannot be replaced by a lower moment. On the other hand, for any θ<1, we exhibit probability vectors p and q that are not permutations of each other, such that there exists a finitary isomorphism Φ from B(p) to B(q) where the coding lengths of Φ and of its inverse have a finite θ moment. We also present an extension to ergodic Markov chains.

scholarly journals An energy and area efficient yet high-speed square-root carry select adder structure

2017 ◽  
Vol 58 ◽  
pp. 101-112 ◽  
Author(s):  
Milad Bahadori ◽  
Mehdi Kamal ◽  
Ali Afzali-Kusha ◽  
Massoud Pedram
Keyword(s):  
High Speed ◽  
Square Root ◽  
Carry Select Adder ◽  
Area Efficient

Transport of fluorescein in trichomes of Lycopersicon esculentum

1982 ◽  
Vol 60 (4) ◽  
pp. 397-402 ◽  
Author(s):  
Gregor F. Barclay ◽  
Carol A. Peterson ◽  
Melvin T. Tyree
Keyword(s):  
Lycopersicon Esculentum ◽  
Cytoplasmic Streaming ◽  
Cytochalasin B ◽  
The Other ◽  
Square Root ◽  
Inhibiting Effect ◽  
Rate Limiting Step ◽  
Limiting Step ◽  
Other Hand ◽  
Rate Limiting

Translocation of the dye disodium fluorescein (uranin) in trichomes of Lycopersicon esculentum (tomato) was nonpolar and proportional to the square root of time. Inhibition of cytoplasmic streaming by cytochalasin B had no effect on the rate of dye movement. On the other hand, disruption of plasmodesmatal connections between adjacent cells by plasmolysis strongly diminished the rate of fluorescein translocation. Subsequent deplasmolysis of the cells did not remove the inhibiting effect of plasmolysis. The data are consistent with the interpretation that dye movement proceeds by diffusion, the rate-limiting step being transport through plasmodesmatal connections.

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