A system-on-chip digital pH meter for use in a wireless diagnostic capsule

This paper describes the design and implementation of a system-on-chip digital pH meter, for use in a wireless capsule application. The system is organized around an 8-bit microcontroller, designed to be functionally identical to the Motorola 6805. The analog subsystem contains a floating-electrode ISFET, which is fully compatible with a commercial CMOS process. On-chip programmable voltage references and multiplexors permit flexibility with the minimum of external connections. The chip is designed in a modular fashion to facilitate verification and component re-use. The single-chip pH meter can be directly connected to a personal computer, and gives a response of 37 bits/pH, within an operating range of 7 pH units

Design of a single-chip pH sensor using a conventional 0.6-μm CMOS process

A pH sensor fabricated on a single chip by an unmodified, commercial 0.6-/spl μm CMOS process is presented. The sensor comprises a circuit for making differential measurements between an ion-sensitive field-effect transistor (ISFET) and a reference FET (REFET). The ISFET has a floating-gate structure and uses the silicon nitride passivation layer as a pH-sensitive insulator. As fabricated, it has a large threshold voltage that is postulated to be caused by a trapped charge on the floating gate. Ultraviolet radiation and bulk-substrate biasing is used to permanently modify the threshold voltage so that the ISFET can be used in a battery-operated circuit. A novel post-processing method using a single layer of photoresist is used to define the sensing areas and to provide robust encapsulation for the chip. The complete circuit, operating from a single 3-V supply, provides an output voltage proportional to pH and can be powered down when not required

Variable sweep aircraft Patent

Development and characteristics of variable sweep wing control system for supersonic aircraf

Threshold behavior of bosonic two-dimensional few-body systems

Bosonic two-dimensional self-bound clusters consisting of $N$ atoms interacting through additive van der Waals potentials become unbound at a critical mass m*(N); m*(N) has been predicted to be independent of the size of the system. Furthermore, it has been predicted that the ground state energy E(N) of the N-atom system varies exponentially as the atomic mass approaches m*. This paper reports accurate numerical many-body calculations that allow these predictions to be tested. We confirm the existence of a universal critical mass m*, and show that the near-threshold behavior can only be described properly if a previously neglected term is included. We comment on the universality of the energy ratio E(N+1)/E(N) near threshold.Comment: 6 pages, 3 figure

Three words from the sacred harp

This three-movement choral piece was written for the University of Glasgow Madrigirls, which is an all female choir under the direction of Katy Cooper and Catriona Hutchinson. The first movement is for two mezzo soprano soloists, the second movement is for quintet, and the third movement is for the full SSAA choir. The piece takes selections of texts from the Sacred Harp Hymnal which are unified according to three movements by the following three words: 1) "I", 2) "will" and 3) "sing". The following is a program note from the first performance on June 17, 2011. <br></br><br></br> Three Words from the Sacred Harp is constructed around the words “I”, “Will” and “Sing”, which were taken from the Sacred Harp, 1991 Edition. <br></br><br></br> In the first movement, a duet on I, the extracts dwell on ideas of journeying home. <br></br><br></br> Journey Home 111<br></br><br></br> I'm on my journey home<br></br><br></br> Parting Friends 267<br></br><br></br> I'm trav'ling through the wilderness<br></br><br></br> Journey Home 111<br></br><br></br> I'm bound fair Canaan's land to see<br></br><br></br> 80 Service to the Lord<br></br><br></br> Farewell, vain world I'm going home<br></br><br></br> <br></br><br></br> My Savior smiles and bids me come Devotion 48<br></br><br></br> Then shall I see, and hear, and know<br></br><br></br> Journey Home 111<br></br><br></br> Oh, who will come and go with me?<br></br><br></br> I'm Going Home 282 <br></br><br></br> And I don't care to stay here long!<br></br><br></br> Eternal Day 383<br></br><br></br> Rivers of life divine I see. <br></br><br></br> In the second movement, on Will, the words deal with inviting God into the home. <br></br><br></br> 335 Return again<br></br><br></br> All will come to desolation, unless Thou return again.<br></br><br></br> 161 Sweet Home<br></br><br></br> All will be peace when I’m with Thee at home. <br></br><br></br> The third movement, Sing, deals with death and eternity. <br></br><br></br> Infinite delight 562<br></br><br></br> And thus I begin to sing<br></br><br></br> Oh grave, where is thy triumph now?<br></br><br></br> Oh death, where is thy sting?<br></br><br></br> Wooten 548<br></br><br></br> And I soon shall sing in eternity<br></br><br></br> Fillmore 434<br></br><br></br> Thus I will sing, till sense and language are no more<br></br><br></br> <br></br><br></br> Many thanks to the Madrigirls for their wonderful singing, to Creative Scotland for making this project possible, and to fasola.org for providing such a unique way of examining the Sacred Harp

Effects of Enamel Paint on the Behavior and Survival of the Periodical Cicada, \u3ci\u3eMagicicada Septendecim\u3c/i\u3e (Homoptera) and the Lesser Migratory Grasshopper, \u3ci\u3eMelanoplus Sanguinipes (Orthoptera).

We present information compiled from several studies on the effects of methods for marking individual arthropods on their longevity and behavior. Results from our own research on effects of enamel paint marking on two in- sect species, the periodical cicada, Magicicada septendecim, and the lesser migratory grasshopper, Melanoplus sanguinipes, are also presented. Neither species showed any adverse survivorship or behavioral effects from marking

Radiographic measurements of the trachea in domestic short haired and Persian cats

Tracheal diameter can be assessed from a thoracic radiograph, with assessment of tracheal diameter in dogs based on ratios between tracheal diameter and a skeletal measurement – however reference ranges are not available for the cat. Tracheal narrowing may cause significant clinical problems, although tracheal hypoplasia in dogs may be clinically silent, and is rarely reported in cats (both mesati- and brachycephalic). The tracheal diameter and trachea:thoracic inlet and trachea:rib ratios were calculated for populations of Domestic Short Haired (DSH) (n=68) and Persian (n=40) cats. This gave reference ranges for radiographic tracheal measurements in these breeds. It is proposed that the tracheal diameter in a normal DSH cat should be 18% of the diameter of the thoracic inlet, and compared to 20% in Persian cats

An integrated study of the development of organic rice cultivation in the Camargue (France)-

In the Camargue, rice and durum wheat are associated in rotations that have an ambivalent ecological impact: on the one hand, these two crops contribute to the preservation of the surrounding ecosystem, while on the other hand, when cropped intensively, they can threaten the ecological equilibrium of this protected area. In this context, organic agriculture would seem to be an alternative adopted by a certain number of producers and processors. However, the pioneers of this practice encounter numerous problems, both agronomic and economic. The study presented here aims: to construct a pluridisciplinary approach to analyse the conditions of the development of organic cereal cultivation in the Camargue: to identify the principal factors that limit the development of this new practice: to produce knowledge useful in helping ricegrowers put into practice organic cropping systems

Dipolar Bose gases: Many-body versus mean-field description

We characterize zero-temperature dipolar Bose gases under external spherical confinement as a function of the dipole strength using the essentially exact many-body diffusion Monte Carlo (DMC) technique. We show that the DMC energies are reproduced accurately within a mean-field framework if the variation of the s-wave scattering length with the dipole strength is accounted for properly. Our calculations suggest stability diagrams and collapse mechanisms of dipolar Bose gases that differ significantly from those previously proposed in the literature