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New observations of black hole devouring a star reveal rapid disk formation（图）
New observations black hole devouring star rapid disk formation
2020/9/11
When a star passes too close to a supermassive black hole, tidal forces tear it apart, producing a bright flare of radiation as material from the star falls into the black hole. Astronomers study the ...
Scientists discover massive rotating disk in early universe（图）
Scientists massive rotating disk early universe
2020/6/5
In the 13.8 billion-year-old universe, most galaxies form gradually, reaching their large mass relatively late.But the National Science Foundation-funded discovery of a massive rotating disk gala...
Constraints on mechanisms of chondrule formation from chondrule precursors and chronology of transient heating events in the protoplanetary disk
chondrules refractory inclusions chondrule precursors transient heating
2017/4/10
The mineralogy, petrography, and oxygen-isotope compositions of porphyritic chondrules—dominant chondrule type
in most chondrite groups—suggest formation by incomplete melting of isotopically diverse...
Full Disk Encryption: Bridging Theory and Practice
disk encryption theory full disk encryption FDE
2016/12/7
We revisit the problem of Full Disk Encryption (FDE), which
refers to the encryption of each sector of a disk volume. In the context
of FDE, it is assumed that there is no space to store additional ...
Reflection-type holographic disk-type memory using three-dimensional speckle-shift multiplexing
holographic memory reflection-type hologram speckle shift multiplexing
2016/11/22
This review presents a reflection-type holographic memory using three-dimensional(3D) speckle-shift multiplexing. First, the schematic of the proposed memory system was described. Then, experimental d...
What users should know about Full Disk Encryption based on LUKS
Linux Unified Key Setup (LUKS) Password-Based Key Derivation Function 2 (PBKDF2) Full Disk Encryption (FDE)
2016/3/11
Mobile devices, laptops, and USB memory usually store large amounts of sensitive information frequently unprotected. Unauthorized access to or release of such information could reveal business secrets...
ALMA reveals planet-forming potential of protoplanetary disk
ALMA planet-forming potential protoplanetary disk
2016/2/23
Astronomers struggle to understand how planets form in binary star systems. Early models suggested that the gravitational tug-of-war between two stellar bodies would send young planets into eccentric ...
We are given a set of weighted unit disks and a set of points in Eu-clidean plane. The minimum weight unit disk cover (WUDC) problem asks for a subset of disks of minimum total weight that covers all ...
Disk Encryption: Do We Need to Preserve Length?
Disk encryption Tweakable Enciphering Schemes Deterministic Authenticated Encryption
2015/12/29
In the last one-and-a-half decade there has been a lot of activity towards development of cryptographic techniques for disk encryption. It has been almost canonised that an encryption scheme suitable ...
Gravitational instability and clustering in a disk of planetesimals
stars planetary systems protoplanetary disks – gravitation – planets satellites formation
2015/12/25
For a long time, gravitational instability in the disk of planetesimals has been suspected to be the main engine responsible for the beginning of dust growth, its advantage being that it provides forr...
Planetesimal clusters in a Keplerian disk I. gravitational evolution
planetary systems formation protoplanetary disks gravitation
2015/12/25
It was recently demonstrated by numerical simulations that a turbulent flow in a rotating system is capable of efficiently concentrating passively advected particles – having a density larger thanthe ...
Self-sustained mechanical vibrations of a disc-type micro-fabricated resonator were experimentally observed when a con-tinuous wave (CW) laser beam was focused on the periphery of the disc (for a 40 μ...
A 54 MHz BiCMOS Digital Equalizer for Magnetic Disk Drive
BiCMOS Digital Equalizer Magnetic Disk Drive
2015/8/14
Until recently, only analog bit-detectors have been avail-able for high-speed magnetic-disk recording. Because of high data-rates and strict power consumption limits, digital approaches have been deem...
Numerical solution of a two-disk problem
Numerical solution control system and feedback compensator Fahrenheit convex programming numerical Fahrenheit programming
2015/8/12
A multidisk problem in frequency domain control system synthesis is a problem in which the designer wishes to find a feedback compensator that minimizes the H_infty-norm of a certain transfer matrix r...
Restrictions to Invariant Subspaces of Composition Operators on the Hardy Space of the Disk
composition operator hardy semigroup
2015/1/19
Invariant subspaces are a natural topic in linear algebra and operator theory. In some rare cases, the restrictions of operators to different invariant subspaces are unitarily equivalent, such as cert...