This paper describes the development of a high-power, coherent radar system at W-band and discusses potential applications radars with this new capability. Previous in frequency band were limited by available power-amplifier technology to about 500 W average power; WARLOC represents an increase power, 20 times, over previous 94 GHz. performance improvement is possible due gyroklystron amplifier specifically for future band. The tubes deliver 100 kW peak power 10 center approximately Other...

Vietnam's history has witnessed the nation's constant effort to learn from outside world. This paradoxically co-exists with country's aspiration escape foreign domination, protect national independence and preserve identity. Discussions of influences in Vietnamese education system should be situated within overall political historical condition Vietnam, which been characterised by influence successive external forces countries. There have a lot debates discussions about nature, benefits...

Over the past three decades, higher education landscape in many Asian countries has witnessed various changes, of which have resulted from foreign influences and interactions local policy discourse with neo-liberal globalisation, market forces demand for a economy. This article provides nuanced insights into how influenced practices related to teaching-learning, research community engagement Vietnamese universities. The analysis university leaders' academics' perspectives reveals positive...

Extensive experimental measurements were carried out to test the accuracy of parametric helix traveling-wave tube (TWT) code, CHRISTINE. The model is one-dimensional, with beam electrons represented as rigid disks. Multifrequency interactions are supported and RF circuit can be optionally cold-test data, a sheath model, or recently implemented tape model. Simulations using shown in good agreement an L-band TWT over broad (250-MHz) frequency range. In intermediate saturated power regimes,...

High power millimeter wave instrumentation radars have a number of important applications ranging from defense missions to basic scientific studies At the Naval Research Laboratory, new high 94 GHz radar named WARLOC has been developed. This employs gyro-klystron as final amplifier and was developed during 1996-2001. The integrated transportable system, using 100 kW peak, 10 average amplifier, low-loss transmission line, quasioptical duplexer, Cassegrain antenna. transmitter operation...

This article draws on Raewyn Connell's Southern theory and other related scholarship to undertake an analysis of scholarly literature relating academic governance, highlighting the dominance theoretical models by researchers from global North. The also publicly available data United States (US), England Australia board composition, function mode establishment show that while governance adopted within Anglophone nations originally derived medieval Europe then England, US has gone develop its...

A new signal processing technique, referred to as transmitter noise compensation (TNC), has been developed at the Naval Research Laboratory (NRL) improve capability of existing radars suppress returns from strong clutter. This technique compensates for intra-pulse noise, well power supply instabilities, by capturing and an accurate replica each transmitted pulse. Subsequently, through pulse-to-pulse comparisons, measured transmit errors are used derive a digital filter which in processor...

Reordering is of crucial importance for machine translation. Solving the reordering problem can lead to remarkable improvements in translation performance. In this paper, we propose a novel approach solve word statistical We rely on dependency relations retrieved from parser incorporating with linguistic hand-crafted rules create transformations. These dependency-based transformations produce movement both phrase and which difficult parse tree based approaches. Such are then applied as...

The electromagnetic spectrum traditionally used by radar systems is under pressure from the growing global need for wireless communications services. Additional factors, such as technology shift towards high duty-cycle solid-state transmitters and phased arrays using uniformly illuminated transmit apertures, are making radar-to-radar interference problem more important than ever before. Such high-level (EMI) to can result in degraded performance, modern high-performance pulse doppler radars...

CHRISTINE is a 1D nonlinear parametric helix TWT code that can accept multiple-carrier inputs and accurately simulate the performance of including effects harmonic interaction intermodulation distortion. To test multi-frequency capabilities accuracy an improved tape model, series two-tone experiments was carried out with Hughes 8537B TWT, periodic permanent magnet (PPM) focused designed to produce nominal 80-W saturated output power over frequency range 1.530 1.548 GHz. The simulations were...

Heat flux maps were constructed for four models of radiant electric heaters. The show the position and amplitude maximum heat each model. Asymmetric emission, multiple local maxima, high magnitudes, relative to critical fire indicators seen. Potential techniques reduce at any without decreasing power output are discussed.

Background: Vietnam is one of the countries most impacted by disasters in Asia- Pacific. Floods, droughts and storms are common catastrophes. These risks endanger millions lives create massive financial production losses.Objective: This study aims at reviewing disaster risk management (DRM) system Vietnam, identifying progress challenges this system, hence making recommendations for improving better responding with natural hazards.Method: The uses PSR model (Pressure- State- Response)...

We describe a non‐perturbing diagnostic to measure the position and profile of tightly bunched (μm‐sized) beams. The probe consists finely‐focused low‐energy (≲30 keV) ion beam that is injected across path be measured. deflections ions are measured with gated microchannel plate (MCP) detector recorded video camera frame grabber. By appropriately selecting species energy, can used beams having wide range charge density. will two operating regimes. first holds for very short duration bunches,...

The development of high power amplifiers and systems in the millimeter wave bands necessitates extension RF testing techniques beyond traditional used for single-moded systems. objective this paper is to describe many use measurement these overmoded systems, provide examples from authors' efforts 94 GHz radar based on B.G. Danly et al. (1999) (2002).

The naval research laboratory has recently developed a high power 94 GHz radar with scanning capability, WARLOC. It relies on three advances in millimeter wave gyroklystron, designed at NRL and manufactured CPI [2,3], quasi-optical duplexer [4] by Lincoln laboratory, an overmoded waveguide transmission system General Atomics. WARLOC transmitter is to generate up 100 kW of peak 10 average GHz; operation date been approximately 70 2 power. This about orders magnitude more than W band cloud...