UNIVERSAL RODENT CONTAMINATION PROTECTION COVER PLATE FOR NATURAL CONVECTION PRODUCTS

Techniques are presented herein that support a universal rodent contamination cover plate for natural convection products. Aspects of the presented techniques encompass a top cover with integrated magnets that may be attached to the top of a piece of equipment (e.g., on-demand, within a poorly managed environment) thus not adding an extra cost to a base design or to a default field installation. Importantly, a solution according to aspects of the presented techniques is scalable to support all product sizes. Further aspects of the presented techniques will work with all flat surface ferrous metallic chassis (thus staying within the top surface footprint and not interfering with other mounting brackets). Additionally, if an enclosure’s top surface is non-metallic or plastic, an add-on adhesive ferrous metallic plate kit may be applied to the equipment surface so that the magnetic cover may be attached. Under still further aspects of the presented techniques, one cover plate stock keeping unit (SKU) may support many products if a chassis width is approximately the same given a certain limit range of depth

AUTOMATION TECHNIQUES TO CUSTOMIZE VIA/PIN PRINTED CIRCUIT BOARD PADSTACKS FOR ENHANCED SIGNAL INTEGRITY PERFORMANCE

The printed circuit board (PCB) design community has a desperate need to establish a robust, automated process that enables the use of customized via and pin definitions for enhanced signal performance in current and next generation 56/112/224 gigabit per second (Gbps) designs. Presented herein is a robust, automated process (and tool) to enable the design, implementation, management, and verification of customized via and pin definitions for a variety of PCB designs. In particular, a spreadsheet format is defined to provide the exact details of each transition designed for a PCB. A software tool provides for the ability to modify a family of base transitions, create a family of custom pad definitions for every layer, and manage those pad definitions within the PCB

Passenger Transmitters as A Possible Cause of Aircraft Fuel Ignition

An investigation was performed to study the potential for radio frequency (RF) power radiated from transmitting Portable Electronic Devices (PEDs) to create an arcing/sparking event within the fuel tank of a large transport aircraft. A survey of RF emissions from typical intentional transmitting PEDs was first performed. Aircraft measurements of RF coupling to the fuel tank and its wiring were also performed to determine the PEDs induced power on the wiring, and the re-radiated power within the fuel tank. Laboratory simulations were conducted to determine the required RF power level for an arcing/sparking event. Data analysis shows large positive safety margins, even with simulated faults on the wiring

Structural constraints of vaccine-induced tier-2 autologous HIV neutralizing antibodies targeting the receptor-binding site.

CAPRISA, 2017.Abstract available in pdf

Zika virus protection by a single low dose nucleoside modified mRNA vaccination

Zika virus (ZIKV) has recently emerged as an explosive pandemic associated with severe neuropathology in newborns and adults1. There are no ZIKV-specific treatments or preventatives; thus, development of a safe and effective vaccine is a high priority. Messenger RNA (mRNA) has emerged as a versatile and highly effective platform to deliver vaccine antigens and therapeutic proteins2,3. Here, we demonstrate that a single low-dose intradermal immunization with lipid nanoparticle-encapsulated nucleoside-modified mRNA (mRNA-LNP) encoding the pre-membrane and envelope (prM-E) glycoproteins of a 2013 ZIKV outbreak strain elicited potent and durable neutralizing antibody responses in mice and non-human primates. Immunization with 30 μg of nucleoside-modified ZIKV mRNA-LNPs protected mice from ZIKV challenges at 2 weeks or 5 months post-vaccination, and a single dose of 50 μg was sufficient to protect non-human primates from a challenge at 5 weeks post-vaccination. These data demonstrate that nucleoside-modified mRNA-LNPs elicit rapid and durable protective immunity and thus represent a new and promising vaccine candidate for the global fight against ZIKV

The Accuracy of Port Connections between Layers in Printed Circuit Board

Port-connected models are widely used in many applications such as printed circuit board models. Much compute time can be saved by using only ports to connect the printed circuit board layers. The accuracy of port connected models is investigated in this paper for the relevant frequency range for PDN applictions. In this short paper, we use a specific three layer structure to study the coupling among closely located ports which connect the two layers

Implementation of a 18 GHz Bandwidth Channel Emulator using an FIR Filter

An implementation of a broadband channel emulator is presented using a Finite Impulse Response (FIR) filter which operates up to 18 GHz (HMC6545LP5E). This integrated circuit has two differential channels, each having 9 adjustable taps and a delay between taps of 18 ps. The individual tap behaviors do not match to that of an ideal FIR filter. The response for each tap is measured to create a \u27basis function\u27. Using these basis functions a method is presented that matches the filter response to a desired response within the limits of the filter. Two methods are used to obtain a match between the desired channel response and the simulated response: least square method (LSM) and genetic algorithm (GA). The LSM uses mapping functions which map from the obtained tap coefficients to the IC tap coefficients for each tap while GA uses exact measured data of each individual tap to achieve the best tap coefficient for a given target channel. The calculated and measurement results of these methods are presented and compared for both methods

Design of a 20 GHz Bandwidth Dual-Stage Dual-FIR Channel Emulator

A 20 GHz channel emulator for broadband differential data links has been developed using a trace overlaid with lossy materials and a two stage programmable Finite Impulse Response (FIR) filter. It allows to emulate the main channel and the cross-talk in the data links. The hardware design and emulation procedure are described. The emulated channel matches the target channel, validating the design methodology

Emulation of Lossy Channels using a Low Loss Microstrip Trace with Added Lossy Materials

Long traces or cables usually show a smooth rolloff with increasing frequency leading to Inter-Symbol Interference Jitter. The paper proposes a method for emulating such channel link performance by using a short microstrip trace with added lossy material. The paper focuses on the characterization and selection of lossy materials for emulating long channels using a short low loss trace with added lossy material