Reconsidering Rapid Qubit Purification by Feedback

This paper reconsiders the claimed rapidity of a scheme for the purification of the quantum state of a qubit, proposed recently in Jacobs 2003 Phys. Rev. A67 030301(R). The qubit starts in a completely mixed state, and information is obtained by a continuous measurement. Jacobs' rapid purification protocol uses Hamiltonian feedback control to maximise the average purity of the qubit for a given time, with a factor of two increase in the purification rate over the no-feedback protocol. However, by re-examining the latter approach, we show that it mininises the average time taken for a qubit to reach a given purity. In fact, the average time taken for the no-feedback protocol beats that for Jacobs' protocol by a factor of two. We discuss how this is compatible with Jacobs' result, and the usefulness of the different approaches.Comment: 11 pages, 3 figures. Final version, accepted for publication in New J. Phy

Time-Varying Agglomeration Externalities in UK Counties between 1841 and 1971

Using dynamic panel data methods on UK counties (1841-1971), we investigate long-term employment dynamics in seven distinct local industries. We study how industries benefit from specialised environments (MAR), diverse local economies (Jacobs’) and large local markets (urbanization), and, in contrast to most other authors, test if the strength of MAR, Jacobs’ and urbanization externalities changes over time. We find declining MAR and rising Jacobs’ externalities since the mid-nineteenth century, questioning the adequacy of a static framework when studying agglomeration externalitiesagglomeration, dynamic externalities, Jacobs’ externalities, MAR externalities, urbanization externalities

Incidents in the Life of a Slave Girl, Education and Abolition

Some thirty years before Harriet Ann Jacobs opened the Jacobs Free School in Alexandria, Virginia in January 1864, one of her first students was her fifty-threeyear-old uncle, Fred. The seventeen-year-old Harriet appreciated her uncle\u27s most earnest desire to learn to read and promised to teach him.1 As slaves, both teacher and student risked the punishment of thirtynine lashes on [the] bare back as well as imprisonment for violating North Carolina\u27s anti-literacy laws targeting African Americans.2 Nevertheless they agreed to meet three times a week in a quiet nook where she instructed him in secret.3 While the primary goal for him was to read the Bible, this moment in Jacobs\u27 slave narrative Incidents in the Life of a Slave Girl revealed her early commitment to African American literacy and education as well as her rejection of the laws of American slavery. In that moment, the vocations of education and abolition took root for Harriet Jacobs

pDNA capture using grafted adsorbents

BACKGROUND: ‘Expanded’ composite materials are of interest as an alternative, or as a supplement, to packed-bed chromatography during bioproduct recovery and purification. Functionalized non-woven fabrics and mega-porous bodies are examples of systems that showed promise. However, there is scarce information on their suitability to capture and release plasmid DNA (pDNA), an important type of product employed in gene therapy. RESULTS: Composite adsorbents were prepared using either chemical (CG-DEAE-NW) or gamma-irradiated graft-polymerization (GIR-DEAE-MP), and subsequently modified to have diethylamino ethanol (DEAE) functionality. Capture experiments showed that pDNA can actually reversibly bind to the two mentioned adsorbents, with capacity values of 2.4 and 1.3 mg per mL, respectively. These values are in the range of what can be expected from commercial beaded adsorbents but lower that the values expected from monoliths. CONCLUSIONS: Expanded materials, due to their high voidage, may present limited capacity for pDNA. However, such materials are able to bind proteins and other contaminants from bacterial lysate, opening the way for their utilization in the ‘negative’ mode.Fil: Singh, Naveen Kumar. University of Notre Dame; Estados Unidos. Jacobs University; AlemaniaFil: Dsouza, Roy N.. Jacobs University; AlemaniaFil: Yelemane, Vikas. Jacobs University; AlemaniaFil: Nentwig, Nina. Jacobs University; AlemaniaFil: Grasselli, Mariano. Universidad Nacional de Quilmes; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata; ArgentinaFil: Fernández Lahore, Marcelo. Jacobs University; Alemani

Business Training, Volume 1, Number 5, August 1914

Newsletter of the Rhode Island Commercial School (RICS) owned by Henry Jacobs. In 1916 RICS merged with Bryant & Stratton when Jacobs bought Bryant. Photos of teachers Gertrude Johnson and Mary Wales appear on page 5. Johnson and Wales left RICS to form Johnson & Wales (now Johnson & Wales University) in 1914

Current of interacting particles inside a channel of exponential cavities: Application of a modified Fick--Jacobs equation

The Fick--Jacobs equation has been widely studied, because of its applications in the diffusion and transport of non-interacting particles in narrow channels. It is also known that a modified version of this equation can be used to describe the same system with particles interacting through a hard-core potential. In this work we present a system that can be exactly solved using the Fick--Jacobs equation. The exact results of the particle concentration profile along the channel $n$, the current, $J$, and the mobility, $\mu$, of particles as a function of an external force are contrasted with Monte Carlo simulations results of non-interacting particles. For interacting particles the behavior of $n$, $J$ and $\mu$, obtained from the modified Fick--Jacobs equation are in agreement with numerical simulations, where the hard-core interaction is taken into account. Even more, for interacting particles the modified Fick--Jacobs equation gives comparatively more accurate results of the current difference (when a force is applied in opposite directions) than the exact result for the non-interacting ones

Creation Theology: A Journey

address, Woolwich Community Health Care Centre, St Jacobs, Ontario, F 7 1995

A Palaeoenvironmental Investigation of Two Prehistoric Burnt Mound Sites in Northern Ireland

Funded by Road services Northern Ireland, Jacobs and Headland ArchaeologyPeer reviewedPostprin