1,504 research outputs found
The improvement of zinc electrodes for electrochemical cells
Zinc electrode improvement for silver-zinc storage batter
The improvement of zinc electrodes for electrochemical cells Quarterly report no. 2, Sep. 4 - Dec. 4, 1965
Growth parameters of mossy and crystalline dendrites applied to manufacture and handling of silver-zinc batterie
Improved alkaline electrochemical cell
Addition of lead ions to electrolyte suppresses zinc dendrite formation during charging cycle. A soluble lead salt can be added directly or metallic lead can be incorporated in the zinc electrode and allowed to dissolve into the electrolyte
Dark energy records in lensed cosmic microwave background
We consider the weak lensing effect induced by linear cosmological
perturbations on the cosmic microwave background (CMB) polarization
anisotropies. We find that the amplitude of the lensing peak in the BB mode
power spectrum is a faithful tracer of the dark energy dynamics at the onset of
cosmic acceleration. This is due to two reasons. First, the lensing power is
non-zero only at intermediate redshifts between the observer and the source,
keeping record of the linear perturbation growth rate at the corresponding
epoch. Second, the BB lensing signal is expected to dominate over the other
sources. The lensing distortion on the TT and EE spectra do exhibit a similar
dependence on the dark energy dynamics, although those are dominated by primary
anisotropies. We investigate and quantify the effect by means of exact tracking
quintessence models, as well as parameterizing the dark energy equation of
state in terms of the present value () and its asymptotic value in the
past (); in the interval allowed by the present constraints on dark
energy, the variation of induces a significant change in the BB
mode lensing amplitude. A Fisher matrix analysis, under conservative
assumptions concerning the increase of the sample variance due to the lensing
non-Gaussian statistics, shows that a precision of order 10% on both
and is achievable by the future experiments probing a large sky
area with angular resolution and sensitivity appropriate to detect the lensing
effect on the CMB angular power spectrum. These results show that the CMB can
probe the differential redshift behavior of the dark energy equation of state,
beyond its average.Comment: New version including substantial text change, three more figures and
two more table
Anisotropic Nonlinear Diffusion with Absorption: Existence and Extinction
The authors prove that the nonlinear parabolic partial differential equation ∂ u ∂ t = ∑ i , j = 1 n ∂ 2 ∂ x i ∂ x j φ i j ( u ) − f ( u ) with homogeneous Dirichlet boundary conditions and a nonnegative initial condition has a nonnegative generalized solution u . They also give necessary and sufficient conditions on the constitutive functions φ i j and f which ensure the existence of a time t 0 \u3e 0 for which u vanishes for all t ≥ t 0
Flow along tool-chip interface in orthogonal metal cutting
In recent papers it has been suggested that over part of the toolchip
contact zone the chip does not slide but sticks to the tool, chip
flow taking place by shear within the body of the chip. Sticking
contact is inconsistent with steady state cutting and in this paper a
slip-line field model of chip flow is presented which does not include
sticking contact and which is consistent with the relevant experimental
observations
The improvement of zinc electrodes for electrochemical cells Quarterly report no. 3, 5 Dec. 1965 - 4 Mar. 1966
Dendrite deposits on zinc electrodes of electrochemical cell and substrate effect
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