摘要:
A method for estimating a coil sensitivity map for a magnetic resonance (MR) image includes providing (61) a matrix A of sliding blocks of a 2D image of coil calibration data, calculating (62) a left singular matrix V∥ from a singular value decomposition of A corresponding to τ leading singular values, calculating (63) P=V∥V∥H, calculating (64) a matrix S that is an inverse Fourier transform of a zero-padded matrix P, and solving (65) MHcr=(Sr)Hcr for cr, where cr is a vector of coil sensitivity maps for all coils at spatial location r, and M ( ( 1 1 … 1 0 0 … 0 … … … 0 0 … 0 ) ( 0 0 … 0 1 1 … 1 … … … 0 0 … 0 ) … ( 0 0 … 0 0 0 … 0 … … … 1 1 … 1 ) ) .
摘要:
Spin current generators and systems and methods for employing spin current generators. A spin current generator may be configured to generate a spin current polarized in one direction, or a spin current selectively polarized in two directions. The spin current generator may by employed in spintronics applications, wherein a spin current is desired.
摘要:
A method for reconstructing parallel magnetic resonance images includes providing a set of acquired k-space MR image data y, and finding a target MR image x that minimizes ½∥Fv−y∥22+λ∥z∥1 where v=Sx and z=Wx where S is a diagonal matrix containing sensitivity maps of coil elements in an MR receiver array, F is an FFT matrix, W is a redundant Haar wavelet matrix, and λ≧0 is a regularization parameter, by updating x k + 1 = ( μ 1 I + μ 3 S H S ) - 1 [ μ 1 W H ( z k - b z k ) + μ 3 S H ( v k - b v k ) ] , z k + 1 = soft ( Wx k + 1 b z k , 1 μ 1 ) where soft ( x , T ) = { x + T if x ≤ - T , 0 if x ≤ T , x - T if x ≥ T , and v k + 1 = ( F H F + μ 3 I ) - 1 [ F H y + μ 3 ( Sx k + 1 + b v k ) ] , where k is an iteration counter, μ1 and μ3 are parameters of an augmented Lagrangian function, and bz and bv are dual variables of the augmented Lagrangian.
摘要翻译:重建并行磁共振图像的方法包括提供一组获取的k空间MR图像数据y,并找到最小化½|Fv-y‖22+λ‖z‖1的目标MR图像x,其中v = Sx和z = Wx其中S是包含MR接收器阵列中的线圈元件的灵敏度映射的对角矩阵,F是FFT矩阵,W是冗余Haar小波矩阵,并且λ> = 0是正则化参数,通过更新xk + 1 = (μ1 I +μ3 SH SH) - 1(zk-bzk)+ mu 3 SH(vk-bvk)],zk + 1 =软(Wx k + 1,bzk,1 mu 1)其中软(x,T)= {x + T如果x x = = T,如果x<= T,x - 其中k是迭代,其中k是迭代,其中k是迭代,其中k是迭代,其中k是迭代 计数器,mu1和mu3是增强的拉格朗日函数的参数,bz和bv是增强的拉格朗日的双重变量 ianㄧ。
摘要:
An array of nonvolatile memory cells includes a plurality of vertically stacked tiers of nonvolatile memory cells. The tiers individually include a first plurality of horizontally oriented first electrode lines and a second plurality of horizontally oriented second electrode lines crossing relative to the first electrode lines. Individual of the memory cells include a crossing one of the first electrode lines and one of the second electrode lines and material there-between. Specifically, programmable material, a select device in series with the programmable material, and current conductive material in series between and with the programmable material and the select device are provided in series with such crossing ones of the first and second electrode lines. The material and devices may be oriented for predominant current flow in defined horizontal and vertical directions. Method and other implementations and aspects are disclosed.
摘要:
An electrical connector includes a base, a cover and at least one elastic member. The base is disposed with at least one fastening portion and at least one pivoting portion. The cover covers on the base, disposed with at least one locking portion correspondingly locking the fastening portion, and capable of being opened or closed relative to the base about the pivoting portion. The at least one elastic member press against the base. When the locking portion unlocks the fastening portion, the elastic member pops up automatically due to elasticity, so that an operating space is formed below the cover to allow an operator to open the cover with fingers, which facilitates operation and does not cause injuries of the fingers, thereby ensuring safe use.
摘要:
Some embodiments include methods in which a memory cell is formed to have programmable material between first and second access lines, with the programmable material having two compositionally different regions. A concentration of ions and/or ion-vacancies may be altered in at least one of the regions to change a memory state of the memory cell and to simultaneously form a pn diode. Some embodiments include memory cells having programmable material with two compositionally different regions, and having ions and/or ion-vacancies diffusible into at least one of the regions. The memory cell has a memory state in which the first and second regions are of opposite conductivity type relative to one another.
摘要:
Asymmetric transistors may be formed by creating pocket implants on one source-drain terminal of a transistor and not the other. Asymmetric transistors may also be formed using dual-gate structures having first and second gate conductors of different work functions. Stacked transistors may be formed by stacking two transistors of the same channel type in series. One of the source-drain terminals of each of the two transistors is connected to a common node. The gates of the two transistors are also connected together. The two transistors may have different threshold voltages. The threshold voltage of the transistor that is located higher in the stacked transistor may be provided with a lower threshold voltage than the other transistor in the stacked transistor. Stacked transistors may be used to reduce leakage currents in circuits such as memory cells. Asymmetric transistors may also be used in memory cells to reduce leakage.
摘要:
Spin Torque Transfer (STT) memory cell structures and methods are described herein. One or more STT memory cell structures comprise an annular STT stack including a nonmagnetic material between a first ferromagnetic material and a second ferromagnetic material and a soft magnetic material surrounding at least a portion of the annular STT stack.
摘要:
A rare earth-aluminium/gallate based fluorescent material and manufacturing method thereof are provided. Said rare earth-aluminium/gallate based fluorescent material comprises a core, and a shell which coats said core, wherein said core is a metal nanoparticle, and said shell is a fluorescent powder of chemical formula (Y1-xCex)3(Al1-yGay)5O12, 0
摘要:
Spin current generators and systems and methods for employing spin current generators. A spin current generator may be configured to generate a spin current polarized in one direction, or a spin current selectively polarized in two directions. The spin current generator may by employed in spintronics applications, wherein a spin current is desired.