scholarly journals Deep imaging of the field of the Z = 4.9 quasar PC 1247+3406, and faint galaxy counts in the K band with the Keck telescope

1994 ◽  
Vol 420 ◽  
pp. L1 ◽  
Author(s):  
B. T. Soifer ◽  
K. Matthews ◽  
S. Djorgovski ◽  
J. Larkin ◽  
J. R. Graham ◽  
...  
Keyword(s):  
Faint Galaxy ◽  
Deep Imaging ◽  
K Band

EBG Based Compact Design of Dual Band UWB MIMO Antenna Operating in Ku/K Band

2020 ◽  
Vol 10 (4) ◽  
pp. 268
Author(s):  
Subuh Pramono ◽  
Muhammad Hamka Ibrahim ◽  
Josaphat Tetuko Sri Sumantyo
Keyword(s):  
Dual Band ◽  
Mimo Antenna ◽  
Compact Design ◽  
K Band

K-band SS/TDMA in Japanese satellite communication system

1982 ◽  
Author(s):  
S. OKASAKA ◽  
M. NAKAMURA ◽  
T. TANAKA ◽  
T. TAKEUCHI ◽  
H. KOMAGATA
Keyword(s):  
Communication System ◽  
Satellite Communication ◽  
Satellite Communication System ◽  
K Band

Intelsat-K - Intelsat's first all K band satellite

1992 ◽  
Author(s):  
T. RUSH ◽  
S. DAUGHTRIDGE ◽  
J.-L. FROELIGER ◽  
R. PETERS ◽  
J. SNYDER ◽  
...  
Keyword(s):  
K Band

A high-performance integrated K-band diplexer

1999 ◽  
Vol 47 (8) ◽  
pp. 1477-1481 ◽  
Author(s):  
A.R. Brown ◽  
G.M. Rebeiz
Keyword(s):  
High Performance ◽  
K Band

scholarly journals Principal component analysis tomography in near-infrared integral field spectroscopy of young stellar objects – I. Revisiting the high-mass protostar W33A

2021 ◽  
Vol 503 (1) ◽  
pp. 270-291
Author(s):  
F Navarete ◽  
A Damineli ◽  
J E Steiner ◽  
R D Blum
Keyword(s):  
Large Scale ◽  
Near Infrared ◽  
Rotation Axis ◽  
Principal Component ◽  
Young Stellar Objects ◽  
High Mass ◽  
Continuum Emission ◽  
Rotating Disc ◽  
Stellar Objects ◽  
K Band

ABSTRACT W33A is a well-known example of a high-mass young stellar object showing evidence of a circumstellar disc. We revisited the K-band NIFS/Gemini North observations of the W33A protostar using principal components analysis tomography and additional post-processing routines. Our results indicate the presence of a compact rotating disc based on the kinematics of the CO absorption features. The position–velocity diagram shows that the disc exhibits a rotation curve with velocities that rapidly decrease for radii larger than 0.1 arcsec (∼250 au) from the central source, suggesting a structure about four times more compact than previously reported. We derived a dynamical mass of 10.0$^{+4.1}_{-2.2}$ $\rm {M}_\odot$ for the ‘disc + protostar’ system, about ∼33 per cent smaller than previously reported, but still compatible with high-mass protostar status. A relatively compact H2 wind was identified at the base of the large-scale outflow of W33A, with a mean visual extinction of ∼63 mag. By taking advantage of supplementary near-infrared maps, we identified at least two other point-like objects driving extended structures in the vicinity of W33A, suggesting that multiple active protostars are located within the cloud. The closest object (Source B) was also identified in the NIFS field of view as a faint point-like object at a projected distance of ∼7000 au from W33A, powering extended K-band continuum emission detected in the same field. Another source (Source C) is driving a bipolar $\rm {H}_2$ jet aligned perpendicular to the rotation axis of W33A.

scholarly journals An Ultra-Low-Power K-Band 22.2 GHz-to-26.9 GHz Current-Reuse VCO Using Dynamic Back-Gate-Biasing Technique

Electronics ◽  
2021 ◽  
Vol 10 (8) ◽  
pp. 889
Author(s):  
Xiaoying Deng ◽  
Peiqi Tan
Keyword(s):  
Power Consumption ◽  
Low Power ◽  
Tuning Range ◽  
Frequency Tuning ◽  
Cmos Process ◽  
Voltage Controlled Oscillator ◽  
Back Gate ◽  
Ultra Low Power ◽  
Current Reuse ◽  
K Band

An ultra-low-power K-band LC-VCO (voltage-controlled oscillator) with a wide tuning range is proposed in this paper. Based on the current-reuse topology, a dynamic back-gate-biasing technique is utilized to reduce power consumption and increase tuning range. With this technique, small dimension cross-coupled pairs are allowed, reducing parasitic capacitors and power consumption. Implemented in SMIC 55 nm 1P7M CMOS process, the proposed VCO achieves a frequency tuning range of 19.1% from 22.2 GHz to 26.9 GHz, consuming only 1.9 mW–2.1 mW from 1.2 V supply and occupying a core area of 0.043 mm2. The phase noise ranges from −107.1 dBC/HZ to −101.9 dBc/Hz at 1 MHz offset over the whole tuning range, while the total harmonic distortion (THD) and output power achieve −40.6 dB and −2.9 dBm, respectively.

scholarly journals High Resolution, Deep Imaging Using Confocal Time-of-flight Diffuse Optical Tomography

2021 ◽  
pp. 1-1
Author(s):  
Yongyi Zhao ◽  
Ankit Raghuram ◽  
Hyun Kim ◽  
Andreas Hielscher ◽  
Jacob T Robinson ◽  
...  
Keyword(s):  
High Resolution ◽  
Optical Tomography ◽  
Time Of Flight ◽  
Diffuse Optical Tomography ◽  
Deep Imaging
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