A Basic, Four Logic Cluster, Disjoint Switch Connected FPGA Architecture

This paper seeks to describe the process of developing a new FPGA architecture from nothing, both in terms of knowledge about FPGAs and in initial design material. Specifically, this project set out to design an FPGA architecture which can implement a simple state machine type design with 10 inputs, 10 outputs and 10 states. The open source Verilog-to-Routing FPGA CAD flow tool was used in order to synthesize, place, and route HDL files onto the architecture. This project was completed in terms of the spirit of the original goals of implementing an FPGA from scratch. Although, the project resulted in an architecture which slightly underperformed in its ability to route 100% of 10 input, 10 output, 10 state designs due to the general place and route algorithm used and the lack of non-contrived 10 input 10 output 10 state FSM designs

User-Generated Patterns to Initiate Electronic System Reset

An electronic device generates a hard-reset signal after receiving a sequential input via various sensors or a power supply of the electronic device. The sensors include components that measure physical characteristics or attributes like pressure, acceleration, temperature, light, rotation, changes in a magnetic field, or electricity. The sensors or the power supply generally serve other purposes in the electronic device, and the sequential input prevents an accidental or inadvertent hard-reset signal

Symmetry Protected Topological phases and Generalized Cohomology

We discuss the classification of SPT phases in condensed matter systems. We review Kitaev's argument that SPT phases are classified by a generalized cohomology theory, valued in the spectrum of gapped physical systems. We propose a concrete description of that spectrum and of the corresponding cohomology theory. We compare our proposal to pre-existing constructions in the literature.Comment: 27 pages, 10 figures. v2: citation updat

Squarefree polynomials and Mobius values in short intervals and arithmetic progressions

We calculate the mean and variance of sums of the M\"obius function and the indicator function of the squarefrees, in both short intervals and arithmetic progressions, in the context of the ring of polynomials over a finite field of $q$ elements, in the limit $q\to \infty$. We do this by relating the sums in question to certain matrix integrals over the unitary group, using recent equidistribution results due to N. Katz, and then by evaluating these integrals. In many cases our results mirror what is either known or conjectured for the corresponding problems involving sums over the integers, which have a long history. In some cases there are subtle and surprising differences. The ranges over which our results hold is significantly greater than those established for the corresponding problems in the number field setting.Comment: Added references and corrected misprint

Light-weight fibre-cement cladding elements

By the means of various kinds of light-weight aggregates or aerating agents it is possible to achieve light-weighing of thin-walled fibre-cement composite elements. Even if these are not structural elements, it is necessary to evaluate also strength characteristics and resistance to environment for their durability in certain applications. In one part of our research light-weighing possibilities of standard composition were evaluated by the means of porous structure creation. In the second part the standard aggregate was substituted with available kinds of light-weight porous aggregates in a certain part or in a whole volume. As the limit criterion there was maximal particle size 1 mm for spraying of fibre-cement mixture by the means of special air pressure equipment. This paper brings not only a summary of laboratory experiments but also examples of successful realizations such as balcony panelboards, façade elements, bridge structure claddings or bulk flower pots

On the average number of elements in a finite field with order or index in a prescribed residue class

For any prime p we consider the density of elements in the multiplicative group of the finite field F_p having order, respectively index, congruent to a(mod d). We compute these densities on average, where the average is taken over all finite fields of prime order. Some connections between the two densities are established. It is also shown how to compute these densities with high numerical accuracy.Comment: 25 pages, 4 tables. A conjecture made in the previous version is now resolved. Tables are also improved, thanks to a C++ program written by Yves Gallo

A novel methodology for recording wing beat frequencies of untethered male and female Aedes aegypti

Aedes aegypti is a vector of many significant arboviruses worldwide including dengue, Zika, chikungunya and yellow fever viruses. With vector control methodology pivoting towards rearing and releasing large numbers of insects for either population suppression or virus-blocking, economical remote (sentinel) surveillance methods for release tracking become increasingly necessary. Recent steps in this direction include advances in optical sensors that identify and classify insects based on their wing beat frequency (WBF). As these traps are being developed, there is a strong need to better understand the environmental and biological factors influencing mosquito WBFs. Here, we developed new untethered-subject methodology to detect changes in WBFs of male and female Ae. aegypti. This new methodology involves directing an ultrasonic transducer at a free-flying subject and measuring the Doppler shift of the reflected ultrasonic continuous wave signal. This system’s utility was assessed by determining its ability to confirm previous reports on the effect of temperature, body size and age on the WBFs generated from acoustic or optical-based experiments. The presented ultrasonic method successfully detected expected trends for each factor for both male and female Ae. aegypti without the need for subject manipulation and potential impediment of natural flight dynamics due to tethering. As a result, this ultrasonic methodology provides a new method for understanding the environmental and physiological determinants of male and female WBFs which can inform the design of remote mosquito surveillance systems

Lessons Learnt from Chimera Method Application to a Deploying Krueger Device

The Chimera method is an established method for simulation of overlapping grids. Meshing parts independently has made this method popular for complex geometries as well as moving bodies like propellers and rotors or control surfaces. It is thus a promising method to simulate deflecting high-lift systems. In the frame of the UHURA project, several partners applied their CFD capabilities based on Chimera in order to validate the method for this specific application in comparison to wind tunnel tests. The presentation outlines the different Chimera approaches ranging from structured/2D to hybrid/3D in steady and unsteady simulations for the different type of setups investigated, namely straight and swept wing with full-span and part-span Krueger flap. It summarizes common challenges and best practice for application of the Chimera approach for such a device