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Remote Hawaiian island harbors last land snails of their kind（图）
Remote Hawaiian island harbors last land snails their kind
2020/12/31
The island of Nihoa, a slice of jagged rock that juts out of the Pacific Ocean, is the sole refuge for a rediscovered species of native Hawaiian land snail previously presumed to be extinct.First reco...
Atmospheric scientists identify cleanest air on Earth in first-of-its-kind study（图）
Atmospheric scientists identify cleanest air Earth first-of-its-kind study
2020/6/12
Atmospheric scientist Sonia Kreidenweis of Colorado State University and her colleagues have identified an atmospheric region unchanged by human-related activities. The National Science...
A New Kind Of Influenza Vaccine:One Shot Might Do The Trick（图）
influenza vaccine shot trick
2017/10/24
A seasonal flu shot is a bit like a local weather forecast: Based on the conditions elsewhere and the direction of the prevailing wind, a meteorologist can give the public a pretty good idea of what t...
Energy storage devices called supercapacitors have become a hot area of research, in part because they can be charged rapidly and deliver intense bursts of power. However, all supercapacitors currentl...
Researchers develop completely new kind of polymer
Researchers completely new kind polymer
2016/2/22
Imagine a polymer with removable parts that can deliver something to the environment and then be chemically regenerated to function again. Or a polymer that can lift weights, contracting and expanding...
Generalized Iteration Method for First-Kind Integral Equations
Generalized Iteration Method First-Kind Integral Equations
2015/10/16
An iteration method is described to solve one-dimensional, first-kind integral equations with finite integration limits and difference kernel, K(x − x), that decays exponentially. The method re...
Second kind integral equations for the first kind Dirichlet problem of the biharmonic equation in three dimensions
Second kind integral equation Dirichlet problem Biharmonic equation
2015/7/14
A Fredholm second kind integral equation (SKIE) formulation is constructed for the Dirichlet problem of the biharmonic equation in three dimensions. A fast numerical algorithm is developed based on th...
Artificial Cosmogenesis: A New Kind of Cosmology
arti cial cosmogenesis cosmic evolution computational cosmology digital physics Drake equation
2012/5/29
This paper introduces foundations for a new kind of cosmology. We advocate that computer simulations are needed to address two key cosmological issues. First, the robustness of the emergence of comple...
Theories without the tree property of the second kind
Theories the tree property of the second kind Logic
2012/4/23
We initiate a systematic study of the class of theories without the tree property of the second kind -- NTP2. Most importantly, we show: the burden is "sub-multiplicative" in arbitrary theories (in pa...
A Kind of Accelerated AOS Difference Schemes For Dual Currency Option Pricing Model
Dual currency option pricing model accelerated AOS algorithm 'explicit-implicit' scheme 'implicit-explicit' scheme second order accuracy
2011/10/15
Black-Scholes equation of Dual currency option pricing is a typical multi-asset option pricing model, and it is important to research it's numerical value. This paper uses the accelerated additive ope...
Central simple superalgebras with superantiautomorphism of order two of the second kind
Central simple superalgebras Superantiautomorphisms Superinvolutions Brauer-Wall Groups
2011/4/6
Our main purpose is to develop the theory of existence of superantiautomorphisms of order two of the second kind (which are caled superinvolutions of the second kind) on finite dimensional central sim...
The expansions approach for solving Cauchy integral equation of the first kind
Cauchy integral equation Chebyshev polynomials
2010/9/27
In this paper we expand the kernel of Cauchy integral equation of first kind as a series of Chebyshev polynomials of the second kind times some unknown functions. These unknown functions are determine...
On a kind of Noether symmetries and conservation laws in k-cosymplectic field theory
Symmetries Conservation laws Noether theorem Hamiltonian field theories
2010/12/6
This paper is devoted to studying symmetries of certain kinds of k-cosymplectic Hamiltonian
systems in first-order classical field theories. Thus, we introduce a particular class of
symmetries and s...
Dichotomy and periodic solutions of a kind of integro-differential equations
Periodic solution (h, k)-dichotomy integro-differential equations
2010/9/14
In the present paper, we investigate some important properties of (h, k)-dichotomy. rthermore, we study the higher dimensional periodic system
We exhibit an encoding of knots into processes in the -calculus such that knots are ambient isotopic if and only their encodings are weakly bisimilar.