LOW-COST AUTOMATED FIBER PIGTAILING MACHINE

At present, the high cost of optoelectronic (OE) devices is caused in part by the labor-intensive processes involved with packaging. Automating the packaging processes should result in a significant cost reduction. One of the most labor-intensive steps is aligning and attaching the fiber to the OE device, the so-called pigtailing process. The goal of this 2-year ARPA-funded project is to design and build 3 low-cost machines to perform sub-micron alignments and attachments of single-made fibers to different OE devices. These Automated Fiber Pigtailing Machines (AFPMs) are intended to be compatible with a manufacturing environment and have a modular design for standardization of parts and machine vision for maximum flexibility. This work is a collaboration among Uniphase Telecommunications Products (formerly United Technologies Photonics, UTP), Ortel, Newport/Klinger, the Massachusetts Institute of Technology Manufacturing Institute (MIT), and Lawrence Livermore National Laboratory (LLNL). UTP and Ortel are the industrial partners for whom two of the AFPMs are being built. MIT and LLNL make up the design and assembly team of the project, while Newport/Klinger is a potential manufacturer of the AFPM and provides guidance to ensure that the design of the AFPM is marketable and compatible with a manufacturing environment. The AFPM for UTP will pigtail LiNbO{sub 3} waveguide devices and the AFPM for Ortel will pigtail photodiodes. Both of these machines will contain proprietary information, so the third AFPM, to reside at LLNL, will pigtail a non-proprietary waveguide device for demonstrations to US industry

What can history teach us about the prospects of a European Research Area?

This report is the result of work carried out by the Centre for the Study of the Sciences and the Humanities at the University of Bergen, Norway. The work was commissioned by the European Commission’s Joint Research Centre at Ispra (Italy), and as such this report is the final deliverable of our Service Contract 257218 with the EC-JRC. The history of science has a lot to offer to contemporary debates on research policy and on science in society. This is especially true when the history of science is not seen as independent from political, economic and cultural history. This calls for a historical sensitivity also for challenges, problems, conflicts and crises; and such a sensitivity appears to be timely in present-day Europe, where the word “crisis” is taking a predominant place on public and political scenes. Having argued that the idea that scientific knowledge should determine or prescribe the course of action is in itself part of the 17th century solutions that contemporary society has inherited as part of the problem, the report suggests possible lines of action and reflection for the European Research Area focusing on European values including diversity and tolerance, universalism, democracy and public knowledge. The report also discusses Grand Challenges and Deep Innovation, reassessing the present function of the ERA, and what policy indicators might be of use.JRC.G.3-Econometrics and applied statistic

Consumer preferences for pork, Des Moines, Iowa

The declining demand for pork is of concern to the residents of Iowa and the other states where pork production is important. To determine consumer preferences and attitudes regarding pork and to obtain information on factors affecting consumption of pork and other meats, a probability sample of households in Des Moines, Iowa was selected for interview. An interview was obtained during June 1955 from the person in each of 499 households who generally bought the meat for the family. Income and family size were the principal determinants of pork consumption patterns among the survey households. For a given income, total pork consumption increased sharply as the size of family increased. As income increased for a given size of household, however, pork consumption gradually declined. No differences related to occupation were detected

Journal Staff

A time-dependent coordinate transformation of a constant coeffcient hyperbolic equation which results in a variable coeffcient problem is considered. By using the energy method, we derive well-posed boundary conditions for the continuous problem. It is shown that the number of boundary conditions depend on the coordinate transformation. By using Summation-by-Parts (SBP) operators for the space discretization and weak boundary conditions, an energy stable finite dieffrence scheme is obtained. We also show how to construct a time-dependent penalty formulation that automatically imposes the right number of boundary conditions. Numerical calculations corroborate the stability and accuracy of the approximations

Sampling and testing forages for feeding value

1 online resource (PDF, 2 pages)This archival publication may not reflect current scientific knowledge or recommendations. Current information available from the University of Minnesota Extension: https://www.extension.umn.edu

Interpreting Forage Test Results

This archival publication may not reflect current scientific knowledge or recommendations. Current information available from the University of Minnesota Extension: https://www.extension.umn.edu

Weed Seedling Identification

This archival publication may not reflect current scientific knowledge or recommendations. Current information available from the University of Minnesota Extension: https://www.extension.umn.edu

Weed seedling identification

1 online resource (PDF, 6 pages)This archival publication may not reflect current scientific knowledge or recommendations. Current information available from the University of Minnesota Extension: https://www.extension.umn.edu

Using the Heterodyne Method to Measure Velocities on Shock Physics Experiments

We developed a velocimeter system several years ago that uses the heterodyne method [1]. This system is assembled from commercially available components that were developed for the telecommunications industry. There are several advantages of this system over the traditional VISAR method that has made it increasingly popular. This system is compact, portable, and relatively inexpensive. The maximum velocity of this system is determined by the electrical bandwidth of the electronics and the digitizer sample rate. The maximum velocity for the system described here is over 5 km/s

Time-Dependent and Steady-State Gutzwiller approach for nonequilibrium transport in nanostructures

We extend the time-dependent Gutzwiller variational approach, recently introduced by Schir\`o and Fabrizio, Phys. Rev. Lett. 105 076401 (2010), to impurity problems. Furthermore, we derive a consistent theory for the steady state, and show its equivalence with the previously introduced nonequilibrium steady-state extension of the Gutzwiller approach. The method is shown to be able to capture dissipation in the leads, so that a steady state is reached after a sufficiently long relaxation time. The time-dependent method is applied to the single orbital Anderson impurity model at half-filling, modeling a quantum dot coupled to two leads. In these first exploratory calculations the Gutzwiller projector is limited to act only on the impurity. The strengths and the limitations of this approximation are assessed via comparison with state of the art continuous time quantum Monte Carlo results. Finally, we discuss how the method can be systematically improved by extending the region of action of the Gutzwiller projector.Comment: 13 pages, 6 figure