Results 51 to 60 of about 220,034 (302)

Saddlepoint approximations for noncentral quadratic forms [PDF]

, 1998
Many estimators and tests are of the form of a ratio of quadratic forms in normal variables. Excepting a few very special cases little is known about the density or distribution of these ratios, particularly if we allow for noncentrality in the quadratic
Marsh, P.W.N.
core   +1 more source

Joint inversion scheme with an adaptive coupling strategy - applications on synthetic and real data sets [PDF]

, 2011
Joint inversion strategies for geophysical data have become increasingly popular since they allow to combine complementary information from different data sets in an efficient way.
Heincke, Björn, Hobbs, Richard W., Jegen, Marion, Moorkamp, Max   +3 more
core  

Seismic Ray Impedance Inversion [PDF]

, 2010
This thesis investigates a prestack seismic inversion scheme implemented in the ray parameter domain. Conventionally, most prestack seismic inversion methods are performed in the incidence angle domain.
Lu, Xiaolin, Lu, Xiaolin
core   +1 more source

Multi-task unscented Kalman inversion (MUKI): a derivative-free joint inversion framework and its application to joint inversion of geophysical data

, 2022
Unscented Kalman inversion is a novel method that uses unscented Kalman filter to solve inverse problems. This paper applies it to inverse multiple geophysical observations simultaneously (i.e., Multi-task unscented Kalman inversion (MUKI)). In this method, the model parameters are updated iteratively in a derivative-free way, and a Gaussian ...
Longlong Wang, Yun Chen, Youshan Liu, Nanqiao Du, Wei Li, Junliu Suwen   +5 more
openaire   +2 more sources

Association of CDKN2A/B Homozygous Deletion and Extent of Resection With Survival of Patients With WHO CNS5 Grade 4 Astrocytoma

Annals of Clinical and Translational Neurology, EarlyView.
ABSTRACT Objectives WHO grade 4 astrocytomas are associated with poor prognosis, and their prognostic factors remain controversial. This study aimed to identify the prognostic factors and develop a management algorithm for these patients. Methods This study retrospectively included 151 CNS5 adult grade 4 astrocytomas from two medical centers.
Jiawei Cai, Guanglin Zhu, Qiu He, Chen Luo, Lingyun Zhuo, Xingfu Wang, Yiming Chen, Xiaoyong Chen, Wendong You, Jiaheng Xu, Yuanxiang Lin, Dezhi Kang, Shuai Wu, Zanyi Wu   +13 more
wiley   +1 more source

Flexible Coupling in Joint Inversions: A Bayesian Structure Decoupling Algorithm [PDF]

Journal of Geophysical Research: Solid Earth, 2018
AbstractWhen different geophysical observables are sensitive to the same volume, it is possible to invert them simultaneously to jointly constrain different physical properties. The question addressed in this study is to determine which structures (e.g., interfaces) are common to different properties and which ones are separated.
Nicola Piana Agostinetti, Thomas Bodin
openaire   +6 more sources

Quantifying the Impact of Ocrelizumab on Paramagnetic Rim Lesions in Multiple Sclerosis

Annals of Clinical and Translational Neurology, EarlyView.
ABSTRACT Paramagnetic rim lesions (PRLs) are a subset of chronic active multiple sclerosis (MS) lesions marked by iron‐laden microglia and macrophages. Ocrelizumab, a monoclonal antibody targeting CD20+ B cells, suppresses acute MS activity, but its effect on PRLs remains unclear. In a longitudinal study of 29 ocrelizumab‐treated patients with at least
Kimberly H. Markowitz, Neha V. Safi, Iliana Pliska‐Bloch, Ulrike W. Kaunzner, Ha Luu, Mert Sisman, Yi Wang, Thanh D. Nguyen, Sandra Hurtado Rúa, Susan A. Gauthier   +9 more
wiley   +1 more source

Efficient Probabilistic Joint Inversion of Direct Current Resistivity and Small-Loop Electromagnetic Data

Algorithms, 2020
Often, multiple geophysical measurements are sensitive to the same subsurface parameters. In this case, joint inversions are mostly preferred over two (or more) separate inversions of the geophysical data sets due to the expected reduction of the non ...
Christin Bobe, Daan Hanssens, Thomas Hermans, Ellen Van De Vijver   +3 more
doaj   +1 more source

Towards 3D joint inversion of full tensor gravity, magnetotelluric and seismic refraction data [PDF]

, 2010
EGU2010-4184-2 Joint inversion of different datasets is emerging as an important tool to enhance resolution and decrease inversion artifacts in structurally complex areas.
Heincke, Björn, Hobbs, Richard, Jegen, Marion, Moorkamp, Max, Roberts, Alan   +4 more
core  

Choroid Plexus Enlargement and USPIO‐Based Inflammatory Feature in Cerebral Small Vessel Disease

Annals of Clinical and Translational Neurology, EarlyView.
ABSTRACT Objective The choroid plexus (CP) is a key component of the blood–cerebrospinal fluid barrier (BCSFB), but its mechanism of action in cerebral small vessel disease (CSVD) remains unclear. This study investigated CP volume (CPV) alterations and their association with conventional imaging markers in CSVD and explored the underlying role of ...
Yongqiang Qu, Xiaoning Ren, Cuihua Fan, Chun Li, Lijie Zhang, Zaiqiang Zhang, Shaowu Li, Zhongmeng Lai, Bin Cai, Ying Fu, Yi Lin, Zhibao Zhu   +11 more
wiley   +1 more source