ℓ1\ell_1-minimization method for link flow correction

A computational method, based on $\ell_1$-minimization, is proposed for the problem of link flow correction, when the available traffic flow data on many links in a road network are inconsistent with respect to the flow conservation law. Without extra information, the problem is generally ill-posed when a large portion of the link sensors are unhealthy. It is possible, however, to correct the corrupted link flows \textit{accurately} with the proposed method under a recoverability condition if there are only a few bad sensors which are located at certain links. We analytically identify the links that are robust to miscounts and relate them to the geometric structure of the traffic network by introducing the recoverability concept and an algorithm for computing it. The recoverability condition for corrupted links is simply the associated recoverability being greater than 1. In a more realistic setting, besides the unhealthy link sensors, small measurement noises may be present at the other sensors. Under the same recoverability condition, our method guarantees to give an estimated traffic flow fairly close to the ground-truth data and leads to a bound for the correction error. Both synthetic and real-world examples are provided to demonstrate the effectiveness of the proposed method

Simulation and experiments of a W-band extended interaction oscillator based on a pseudospark-sourced electron beam

This paper presents the first experimental results of an extended interaction oscillator (EIO) based on a pseudospark-sourced electron beam, which produced a peak output power over 38 W at W-band. The advantages of the newly developed device are: 1) transport of the electron beam by the positive-ion focusing channel without the need of an external magnetic field and 2) high interaction impedance and high gain per unit length of the EIO circuit. The experimental results agree well with the 3-D particle-in-cell simulations

Millimeter wave extended interaction oscillator based on pseudospark-sourced electron beam

In this paper the study of a W-band extended interaction oscillator based on a pseudospark-sourced electron beam will be presented. This new device successfully produced a peak output power of over 38 W, which agrees well with the prediction from the 3D particle-in-cell simulation. It displays the outstanding features of compactness and cost-effectiveness. The main contributing factors include the transport of the electron beam by the positive ion focusing channel without the need of an external guiding magnetic field and high interaction impedance and high gain per unit length of the extended interaction oscillator circuit

Preliminary design of a G-band extended interaction oscillator driven by a sheet electron beam

A preliminary design of a G-band extended interaction oscillator (EIO) driven by a sheet electron beam is presented in this paper. PIC-3D simulations reveal that an output power of about 3.1 kW can be achieved when driven by a sheet electron beam with a voltage of 31.5 kV and a current of 0.85 A. The oscillation frequency is 197.3 GHz and the electronic efficiency is about 11.6%

A W-band corrugated output horn and window for gyro-devices

A W-band corrugated horn incorporating a broadband vacuum window for use in a gyro-device as a quasi-optical launcher has been designed, manufactured and experimentally measured. This horn, including a 3 disk vacuum window, converts a cylindrical TE11 mode into the free space TEM00 mode over the frequency band of 90-100 GHz with a reflection better than -30 dB and a coupling efficiency of ∼99.4%

Demonstration of a planar W-band, kW-level extended interaction oscillator based on a pseudospark-sourced sheet electron beam

A W-band extended interaction oscillator (EIO) driven by a pseudospark-sourced sheet electron beam (PS-SEB) is demonstrated in this letter. The idea of combining the advantages of a pseudospark-sourced electron beam (high beam current density), a sheet electron beam geometry (large beam cross-sectional area) and a ladder-like slow wave structure (high gain per unit length) to generate powerful millimeter-wave radiation was experimentally verified. The PS-SEB based EIO produced ~1.2 kW peak output power, an increase of six times in the measured power from an EIO based on a pseudospark-sourced pencil electron beam. Such a methodology offers a promising solution for portable, low-cost and powerful millimeter-wave and terahertz-wave radiation sources

Effect of Irradiation on Quality of Vacuum-Packed Spicy Beef Chops

To develop an alternative pasteurization process for the spicy beef jerky (SBJ), it was treated with irradiation doses of 0, 0.5, 1.5, 3, 4, 6, and 8 kGy and the sensory attributes, texture properties, drip loss, and the protein biological efficiency were studied. The results showed that lightness, drip loss, and off-odor of SBJ increased, while the hardness, chewiness, gumminess, color preference, and taste of SBJ decreased with the increase in irradiation dose. This tendency was obvious as the irradiation dose increased to 6 kGy and 8 kGy. The possible reason for these quality changes might be due to the free radicals produced by irradiation. This speculation is supported by the decrease of the content of capsanthin and the increase of the content of TBARS of SBJ with the increase in irradiation dose. The plate counts of treated SBJ indicated that 4 kGy was suitable for pasteurization of SBJ

Termination of Recurrent Atrial Fibrillation by Superior Vena Cava Isolation: A Case Report

Background: Paroxysmal atrial fibrillation can be triggered by non-pulmonary vein foci, such as the superior vena cava. Here, we report the case of a patient with a 6-year history of paroxysmal atrial fibrillation who received cryoballoon ablation in 2012 but relapsed in 2014. He then received cardiac radiofrequency ablation, which successfully isolated the left pulmonary vein and superior vena cava, but the arrhythmia recently relapsed again. The tachycardia was finally successfully terminated by ablation on the free wall without recurrence during a 2-year following up. Conclusion: Superior vena cava isolation may not require ablation isolation with a full circle way and can be accomplished by ablating several connection points between the superior vena cava and the right atrium