50
50

Jul 13, 2020
07/20

by
Hai Zhang

software

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Open source Material Design file manager An open source Material Design file manager. Features: - Open source: Lightweight, clean and secure. - Material Design: Both MD2 and classic themes, with attention into details. - Breadcrumbs: Navigate in the filesystem with ease. - Root support: View and manage files with root access. - Archive support: View, extract and create common compressed files. - Themes: Customizable UI colors for classic theme, plus night mode. - Linux-aware: Knows symbolic...

Topics: file manager, f-droid signed apk

65
65

Dec 4, 2019
12/19

by
Hai Zhang

software

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An open source Material Design file manager. Features: - Open source: Lightweight, clean and secure. - Material Design: Beautiful UI with attention into details, and optional MD2 style. - Breadcrumbs: Navigate in the filesystem with ease. - Root support: View and manage files with root access. - Archive support: View, extract and create common compressed files. - Themes: Customizable UI colors and night mode. - Linux-aware: Knows symbolic links, file permissions and SELinux context. - Robust:...

Topics: file manager, f-droid signed apk

62
62

Feb 27, 2020
02/20

by
Hai Zhang

software

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eye 62

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An open source Material Design file manager. Features: - Open source: Lightweight, clean and secure. - Material Design: Both MD2 and classic themes, with attention into details. - Breadcrumbs: Navigate in the filesystem with ease. - Root support: View and manage files with root access. - Archive support: View, extract and create common compressed files. - Themes: Customizable UI colors for classic theme, plus night mode. - Linux-aware: Knows symbolic links, file permissions and SELinux context....

Topics: file manager, f-droid signed apk

9
9.0

Aug 14, 2021
08/21

by
Hai Zhang

software

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An open source Material Design file manager. Features: - Open source: Lightweight, clean and secure. - Material Design: Follows Material Design guidelines, with attention into details. - Breadcrumbs: Navigate in the filesystem with ease. - Root support: View and manage files with root access. - Archive support: View, extract and create common compressed files. - NAS support: View and manage files on SFTP and SMB servers. - Themes: Customizable UI colors, plus night mode with optional true...

Topic: file manager

34
34

Mar 20, 2021
03/21

by
Hai Zhang

software

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An open source Material Design file manage Features: - Open source: Lightweight, clean and secure. - Material Design: Follows Material Design guidelines, with attention into details. - Breadcrumbs: Navigate in the filesystem with ease. - Root support: View and manage files with root access. - Archive support: View, extract and create common compressed files. - SMB support: View and manage files on SMB servers. - Themes: Customizable UI colors, plus night mode with optional true black. -...

Topics: file manager, f-droid apk

57
57

May 26, 2020
05/20

by
Hai Zhang

software

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eye 57

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An open source Material Design file manager Features Open source: Lightweight, clean and secure. Material Design: Both MD2 and classic themes, with attention into details. Breadcrumbs: Navigate in the filesystem with ease. Root support: View and manage files with root access. Archive support: View, extract and create common compressed files. Themes: Customizable UI colors for classic theme, plus night mode. Linux-aware: Like Nautilus , knows symbolic links, file permissions and SELinux context....

Topics: file manager, f-droid signed apk

21
21

Apr 6, 2021
04/21

by
Hai Zhang

software

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eye 21

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An open source Material Design file manager. Features: - Open source: Lightweight, clean and secure. - Material Design: Follows Material Design guidelines, with attention into details. - Breadcrumbs: Navigate in the filesystem with ease. - Root support: View and manage files with root access. - Archive support: View, extract and create common compressed files. - SMB support: View and manage files on SMB servers. - Themes: Customizable UI colors, plus night mode with optional true black. -...

Topics: file manager, f-droid apk

19
19

Mar 16, 2022
03/22

by
Hai Zhang

software

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eye 19

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An open source Material Design file manager. Features: - Open source: Lightweight, clean and secure. - Material Design: Follows Material Design guidelines, with attention into details. - Breadcrumbs: Navigate in the filesystem with ease. - Root support: View and manage files with root access. - Archive support: View, extract and create common compressed files. - NAS support: View and manage files on SFTP and SMB servers. - Themes: Customizable UI colors, plus night mode with optional true...

Topic: file manager

44
44

Nov 29, 2020
11/20

by
Hai Zhang

software

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Open source Material Design file manager ===== New in version 1.1.4 - The Material Design 1 theme has been deprecated and will be removed in the next major release. This reduces code complexity and maintenance burden, meanwhile allows new features including AMOLED dark theme, alternative colors for the MD2 theme and outlined icons. - Added Italian and Japanese translations. - Fixed crash when viewing large images. - Fixed certain issues when picking files. - Fixed certain issues in FTP server....

Topics: file manager, f-droid apk

0
0.0

Aug 14, 2022
08/22

by
hai zhang (eyestudio)

data

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Placed above the sink, water will flow from the trough below to the sink.

Topics: lifestyle, stl, 3D Printer Accessories, thingiverse

48
48

Sep 22, 2013
09/13

by
De-Hai Zhang

texts

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A new ''twice loose shoe'' method in the Wheeler-DeWitt equation of the universe wave function on the cosmic scale factor a and a scalar field $\phi$ is suggested in this letter. We analysis the both affects come from the tunneling effect of a and the potential well effect of $\phi$, and obtain the initial values $a_0$ and $\phi_0$ about a primary closed universe which is born with the largest probability in the quantum manner. Our result is able to overcome the ''large field difficulty'' of...

Source: http://arxiv.org/abs/gr-qc/0003079v1

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73

Jul 20, 2013
07/13

by
De-Hai Zhang

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A new idea of the cosmological constant is proposed in this paper. Due to the horizon is limited, the quantum fluctuation of the inflaton field is not zero, a nonzero vacuum energy is remained as a residual inflationary energy of an unusual potential, however the true stable vacuum energy is zero fortunately. A unified model of the cosmological constant and the chaotic inflation is proposed, which satisfies almost all cosmological phenomenology and will can be tested by data of the cosmic large...

Source: http://arxiv.org/abs/hep-ph/9906348v1

53
53

Sep 19, 2013
09/13

by
De-Hai Zhang

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The evolution of the quintessence in various stages of the universe, the radiation-, matter-, and quintessence-dominated, is closely related with the tracking behavior and the deceleration parameter of the universe. We gave the explicit relation between the equation-of-state of the quintessence in the epoch of the matter-quintessence equality and the inverse power index of the quintessence potential, obtained the constraint on this potential parameter come from the present deceleration...

Source: http://arxiv.org/abs/astro-ph/9912458v1

0
0.0

Aug 16, 2022
08/22

by
hai zhang (eyestudio)

data

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Can store 13 drill bits from 1.5mm - 6.5mm

Topics: stl, thingiverse, Tool Holders & Boxes

0
0.0

Aug 15, 2022
08/22

by
hai zhang (eyestudio)

data

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Topographical sculpture of Mount Everest

Topics: stl, mount, thingiverse, Sculptures

6
6.0

Apr 5, 2021
04/21

by
Chang-Hai, Zhang

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comment 0

61
61

Sep 17, 2013
09/13

by
De-Hai Zhang

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Boomerang measured the first peak in CMBR to be at location of $l_D=196\pm 6$, which excites our strong interesting in it. A widely cited formula is $l_D\simeq 200\Omega_T^{-0.50}$ to estimate the cosmic total density. Weinberg shows it is not correct and should be $l_D\propto \Omega_T^{-1.58}$ near the interest point $(\Omega_m,\Omega_\Lambda)=(0.3,0.7)$. We show further that it should be $l_D\propto \Omega_T^{-1.43}\Omega_m^{-0.147}$ or $\Omega_T^{-1.92}\Omega_\Lambda^{0.343}$ near the same...

Source: http://arxiv.org/abs/astro-ph/0007218v1

59
59

Sep 18, 2013
09/13

by
De-Hai Zhang

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Whether our universe with present day acceleration can eventually collapse is very interesting problem. We are also interesting in such problems, whether the universe is closed? Why it is so flat? How long to expend a period for a cycle of the universe? In this paper a simple ``slow-fast'' type of the quintessence potential is designed for the closed universe to realize the present acceleration of our universe and its eventual big collapse. A detail numerical simulation of the universe...

Source: http://arxiv.org/abs/astro-ph/0110193v1

3
3.0

Jun 30, 2018
06/18

by
Eric Bonnetier; Hai Zhang

texts

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The Neumann-Poincar\'e (NP) operator naturally appears in the context of metamaterials as it may be used to represent the solutions of elliptic transmission problems via potentiel theory. In particular, its spectral properties are closely related to the well-posedness of these PDE's, in the typical case where one considers a bounded inclusion of homogeneous plasmonic metamaterial embedded in a homogeneous background dielectric medium. In a recent work, M. Perfekt and M. Putinar have shown that...

Topics: Spectral Theory, Analysis of PDEs, Mathematics

Source: http://arxiv.org/abs/1702.08127

6
6.0

Jun 30, 2018
06/18

by
Habib Ammari; Hai Zhang

texts

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A rigorous mathematical theory is developed to explain the super-resolution phenomenon observed in the experiment by F.Lemoult, M.Fink and G.Lerosey (Acoustic resonators for far-field control of sound on a subwavelength scale, Phys. Rev. Lett., 107 (2011)). A key ingredient is the calculation of the resonances and the Green function in the half space with the presence of a system of Helmholtz resonators in the quasi-stationary regime. By using boundary integral equations and generalized...

Topics: Mathematics, Analysis of PDEs

Source: http://arxiv.org/abs/1405.2513

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55

Sep 18, 2013
09/13

by
Gang Bao; Hai Zhang

texts

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The paper investigates the sensitivity of the inverse problem of recovering the velocity field in a bounded domain from the boundary dynamic Dirichlet-to-Neumann map (DDtN) for the wave equation. Three main results are obtained: (1) assuming that two velocity fields are non-trapping and are equal to a constant near the boundary, it is shown that the two induced scattering relations must be identical if their corresponding DDtN maps are sufficiently close; (2) a geodesic X-ray transform operator...

Source: http://arxiv.org/abs/1211.6220v2

4
4.0

Jun 30, 2018
06/18

by
Gang Bao; Hai Zhang

texts

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Let $g$ be a Riemannian metric for $\mathbf{R}^d$ ($d\geq 3$) which differs from the Euclidean metric only in a smooth and strictly convex bounded domain $M$. The lens rigidity problem is concerned with recovering the metric $g$ inside $M$ from the corresponding lens relation on the boundary $\partial M$. In this paper, the stability of the lens rigidity problem is investigated for metrics which are a priori close to a given non-trapping metric satisfying "strong fold-regular"...

Topics: Mathematics, Differential Geometry

Source: http://arxiv.org/abs/1401.1019

3
3.0

Jun 30, 2018
06/18

by
Habib Ammari; Hai Zhang

texts

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A mathematical theory is developed to explain the super-resolution and super-focusing in high contrast media. The approach is based on the resonance expansion of the Green function associated with the medium. It is shown that the super-resolution is due to sub-wavelength resonant modes excited in the medium which can propagate into the far-field.

Topics: Mathematics, Analysis of PDEs

Source: http://arxiv.org/abs/1412.2214

4
4.0

Jun 29, 2018
06/18

by
Habib Ammari; Hai Zhang

texts

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We derive an effective medium theory for acoustic wave propagation in bubbly fluid near Minnaert resonant frequency. We start with a multiple scattering formulation of the scattering problem of an incident wave by a large number of identical small bubbles in a homogeneous fluid. Under certain conditions on the configuration of the bubbles, we justify the point interaction approximation and establish an effective medium theory for the bubbly fluid as the number of bubbles tends to infinity. The...

Topics: Analysis of PDEs, Mathematics

Source: http://arxiv.org/abs/1604.08409

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11

Apr 5, 2021
04/21

by
Yan-Hua, Liu; Ming-Hai, Zhang

texts

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eye 11

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comment 0

55
55

Jul 20, 2013
07/13

by
Cheng-Yi Sun; De-Hai Zhang

texts

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In this paper, we use the result in [7] to calculate the non-Gaussianity of the racetrack models in [3, 5]. The two models give different non- Gaussianities. Both of them are reasonable.

Source: http://arxiv.org/abs/astro-ph/0604298v3

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44

Sep 18, 2013
09/13

by
Cheng-Yi Sun; De-Hai Zhang

texts

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In [1], KKLT give a mechanism to generate de Sitter vacua in string theory. And the scenario, \emph{Landscape}, is suggested to explain the problem of the cosmological constant. In this paper, adopting a simple potential describing the \emph{landscape}, we investigate the decay of the vacuum and the evolution of the universe after the decay. We find that the big crunch of the universe is inevitable. But, according to the modified Friedmann equation in [11], the singularity of the big crunch is...

Source: http://arxiv.org/abs/hep-th/0611101v1

33
33

Sep 22, 2013
09/13

by
De-Hai Zhang; Cheng-Yi Sun

texts

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As is well known, the exact evolution equation of the curvature perturbation plays a very important role in investigation of the inflation power spectrum of the flat universe. However, its corresponding exact extension for the non-flat universes has not yet been given out clearly. The interest in the non-flat, specially closed, universes is being aroused recently. The need of this extension is pressing. We start with most elementary physical consideration and obtain finally this exact evolution...

Source: http://arxiv.org/abs/astro-ph/0310127v1

9
9.0

Apr 5, 2021
04/21

by
Hong-Hai, Zhang; Jian-Zhang, Ma

texts

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eye 9

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favorite 0

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comment 0

21
21

Nov 4, 2019
11/19

by
Gao Zhi-Hai, Zhang Shi-Cai

texts

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eye 21

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favorite 0

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comment 0

40
40

Sep 23, 2013
09/13

by
Zhi-Hai Zhang; Shi-Jie Yang

texts

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eye 40

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We propose a method to analytically solve the one-dimensional coupled nonlinear Gross-Pitaevskii equations which govern the motion of the spinor Bose-Einstein condensates. In a uniform external potential, the Hamiltonian comprises the kinetic energy, the linear and the quadratic Zeeman energies. Several classes of exact periodic and solitonic solutions, either in real or in complex forms, are obtained for both the F=1 and F=2 condensates. These solutions are general that contain neither...

Source: http://arxiv.org/abs/1305.0372v1

56
56

Sep 21, 2013
09/13

by
Cheng-Yi Sun; De-Hai Zhang

texts

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In this paper, it is shown that the relative entropy is an increasing function of time in both the linear regime and the non-linear regime during the large scale structure formation in cosmology.

Source: http://arxiv.org/abs/gr-qc/0508034v3

62
62

Sep 20, 2013
09/13

by
Xing-Hai Zhang; Su-Peng Kou

texts

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In this paper, we studied a generalized Bose-Hubbard model on a checkerboard lattice with topologically nontrivial flat-band. We used mean-field method to decouple the model Hamiltonian and obtained phase diagram by Landau theory of second-order phase transition. We further calculate the energy gap and the dispersion of quasi-particle or quasi-hole in Mott insulator state and found that in strong interaction limit the quasi-particles or the quasi-holes also have flat bands.

Source: http://arxiv.org/abs/1205.6641v1

6
6.0

Jun 30, 2018
06/18

by
Habib Ammari; Alden Waters; Hai Zhang

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We consider the inverse problem of finding unknown elastic parameters from internal measurements of displacement fields for tissues. The measurements are made on the entirety of a smooth domain. Since tissues can be modeled as quasi-incompressible fluids, we examine the Stokes system and consider only the recovery of shear modulus distributions. Our main result is to establish Lipschitz stable estimates on the shear modulus distributions from internal measurements of displacement fields. These...

Topics: Mathematics, Analysis of PDEs

Source: http://arxiv.org/abs/1409.5138

47
47

Sep 19, 2013
09/13

by
Yong-Chao Zhang; De-Hai Zhang

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We propose a new mass matrix ansatz: At the grand unified (GU) scale, the standard model (SM) Yukawa coupling matrix elements are integer powers of the square root of the GU gauge coupling constant \varepsilon \equiv \sqrt{\alpha_{\text{GU}}}, multiplied by order unity random complex numbers. It relates the hierarchy of the SM ermion masses and quark mixings to the gauge coupling constants, greatly reducing the SM parameters, and can give good fitting results of the SM fermion mass, quark...

Source: http://arxiv.org/abs/0910.3773v3

52
52

Sep 23, 2013
09/13

by
Qing-Rong Zheng; Gang Su; De-Hai Zhang

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We have systematically studied both classical and quantum chaotic behaviors of two colliding harmonic oscillators. The classical case falls in Kolmogorov-Arnold-Moser class. It is shown that there exists an energy threshold, above which the system becomes nonintegrable. For some values of the initial energy near the threshold, we have found that the ratio of frequencies of the two oscillators affects the Poincar\'e sections significantly. The largest Lyapunov character exponent depends linearly...

Source: http://arxiv.org/abs/chao-dyn/9512001v1

5
5.0

Jun 30, 2018
06/18

by
Habib Ammari; Matias Ruiz; Sanghyeon Yu; Hai Zhang

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This paper is concerned with the inverse problem of reconstructing a small object from far field measurements. The inverse problem is severally ill-posed because of the diffraction limit and low signal to noise ratio. We propose a novel methodology to solve this type of inverse problems based on an idea from plasmonic sensing. By using the field interaction with a known plasmonic particle, the fine detail information of the small object can be encoded into the shift of the resonant frequencies...

Topics: Spectral Theory, Mathematical Physics, Analysis of PDEs, Mathematics

Source: http://arxiv.org/abs/1704.04870

4
4.0

Jun 28, 2018
06/18

by
Habib Ammari; Matias Ruiz; Sanghyeon Yu; Hai Zhang

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In this paper we use the full Maxwell equations for light propagation in order to analyze plasmonic resonances for nanoparticles. We mathematically define the notion of plasmonic resonance and analyze its shift and broadening with respect to changes in size, shape, and arrangement of the nanoparticles, using the layer potential techniques associated with the full Maxwell equations. We present an effective medium theory for resonant plasmonic systems and derive a condition on the volume fraction...

Topics: Analysis of PDEs, Mathematics

Source: http://arxiv.org/abs/1511.06817

49
49

Sep 23, 2013
09/13

by
Cong Zhang; Zhi-Hai Zhang; Shi-Jie Yang

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We construct exact stationary solutions to the one-dimensional coupled Gross-Pitaevskii equations for the two-species Bose-Einstein condensates with equal intraspecies and interspecies interaction constants. Three types of complex solutions as well as their soliton limits are derived. By making use of the SU(2) unitary symmetry, we further obtain analytical time-evolving solutions. These solutions exhibit spatiotemporal periodicity.

Source: http://arxiv.org/abs/1303.4142v1

23
23

Jun 27, 2018
06/18

by
Habib Ammari; Pierre Millien; Matias Ruiz; Hai Zhang

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Localized surface plasmons are charge density oscillations confined to metallic nanoparticles. Excitation of localized surface plasmons by an electromagnetic field at an incident wavelength where resonance occurs results in a strong light scattering and an enhancement of the local electromagnetic fields. This paper is devoted to the mathematical modeling of plasmonic nanoparticles. Its aim is threefold: (i) to mathematically define the notion of plasmonic resonance and to analyze the shift and...

Topics: Analysis of PDEs, Mathematics

Source: http://arxiv.org/abs/1506.00866

51
51

Sep 18, 2013
09/13

by
Jing Yu; Xing-Hai Zhang; Su-Peng Kou

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In this paper we study the symmetry protected Majorana edge states for the Z2 topological order of the Wen-plaquette model and the toric-code model and calculate the dispersion of the Majorana edge states. For the system with translational symmetry, the Majorana edge states are gapless and have the nodal points at k=0 and k=pi. For the edge states of the toric-code model without translational symmetry, the edge modes become gapped.

Source: http://arxiv.org/abs/1209.5460v1

65
65

Sep 20, 2013
09/13

by
Peter Bickel; David Choi; Xiangyu Chang; Hai Zhang

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Variational methods for parameter estimation are an active research area, potentially offering computationally tractable heuristics with theoretical performance bounds. We build on recent work that applies such methods to network data, and establish asymptotic normality rates for parameter estimates of stochastic blockmodel data, by either maximum likelihood or variational estimation. The result also applies to various sub-models of the stochastic blockmodel found in the literature.

Source: http://arxiv.org/abs/1207.0865v1

9
9.0

Jun 25, 2018
06/18

by
Zhi Zhang; Tian-Li Ma; Dong-Hai Zhang

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The multiplicity distribution, multiplicity moment, scaled variance, entropy and reduced entropy of target evaporated fragment emitted in forward and backward hemispheres in 12 A GeV $^{4}$He, 3.7 A GeV $^{16}$O, 60 A GeV $^{16}$O, 1.7 A GeV $^{84}$Kr and 10.7 A GeV $^{197}$Au induced emulsion heavy targets (AgBr) interactions are investigated. It is found that the multiplicity distribution of target evaporated fragments emitted in forward and backward hemispheres can be fitted by a Gaussian...

Topic: Nuclear Experiment

Source: http://arxiv.org/abs/1501.00550

14
14

Apr 5, 2021
04/21

by
Xiao-Chen, Yu; Qian-Zhu, Xiao; Ming-Hai, Zhang

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eye 14

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53
53

Sep 18, 2013
09/13

by
Zhi-Hai Zhang; Yong-Kai Liu; Shi-Jie Yang

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We present several exact solutions to the coupled nonlinear Gross-Pitaevskii equations which describe the motion of the one-dimensional spin-2 Bose-Einstein condensates. The nonlinear density-density interactions are decoupled by making use of the properties of Jacobian elliptical functions. The distinct time factors in each hyperfine state implies a "Lamor" procession in these solutions. Furthermore, exact time-evolving solutions to the time-dependent Gross-Pitaevskii equations are...

Source: http://arxiv.org/abs/1209.5852v1

8
8.0

Apr 5, 2021
04/21

by
Zhao-Jun, Feng; Zong-Yun, Li; Chun-Hai, Zhang

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eye 8

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comment 0

12
12

Apr 5, 2021
04/21

by
Qin-Guo, Wei; Hong-Hai, Zhang; Bing-Ran, Guo

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eye 12

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comment 0

4
4.0

Jun 29, 2018
06/18

by
Habib Ammari; Mihai Putinar; Matias Ruiz; Sanghyeon Yu; Hai Zhang

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We prove by means of a couple of examples that plasmonic resonances can be used on one hand to classify shapes of nanoparticles with real algebraic boundaries and on the other hand to reconstruct the separation distance between two nanoparticles from measurements of their first collective plasmonic resonances. To this end, we explicitly compute the spectral decompositions of the Neumann-Poincar\'{e} operators associated with a class of quadrature domains and two nearly touching disks. Numerical...

Topics: Spectral Theory, Analysis of PDEs, Mathematics

Source: http://arxiv.org/abs/1602.05268

38
38

Sep 23, 2013
09/13

by
Zhi-Hai Zhang; Cong Zhang; Shi-Jie Yang; Shiping Feng

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We analytically solve the one-dimensional coupled Gross-Pitaevskii equations which govern the motion of F=1 spinor Bose-Einstein condensates. The nonlinear density-density interactions are decoupled by making use of the unique properties of the Jacobian elliptical functions. Several types of complex stationary solutions are deduced. Furthermore, exact non-stationary solutions to the time-dependent Gross-Pitaevskii equations are constructed by making use of the spin-rotational symmetry of the...

Source: http://arxiv.org/abs/1202.3197v2

3
3.0

Jun 30, 2018
06/18

by
Habib Ammari; Brian Fitzpatrick; Hyundae Lee; Sanghyeon Yu; Hai Zhang

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The aim of this paper is to show both analytically and numerically the existence of a subwavelength phononic bandgap in bubble phononic crystals. The key is an original formula for the quasi-periodic Minnaert resonance frequencies of an arbitrarily shaped bubble. The main findings in this paper are illustrated with a variety of numerical experiments.

Topics: Analysis of PDEs, Mathematics

Source: http://arxiv.org/abs/1702.05317