Results 21 to 30 of about 4,042,033 (199)

Logging evaluation methods of low-organic matter fault-block shale oil in the Subei Basin and their application [PDF]

Youqicang pingjia yu kaifa
The Subei Basin is characterized by a complex structure and well-developed faults. The shale in the second member of the Funing Formation has relatively low organic matter abundance, with a total organic carbon (TOC) generally below 1.5%.
QIAN Shiyou, YANG Zhiqiang, XU Chen
doaj   +1 more source

The Analytic Bethe Ansatz for a Chain with Centrally Extended su(2|2) Symmetry [PDF]

, 2006
We investigate the integrable structure of spin chain models with centrally extended su(2|2) and psu(2,2|4) symmetry. These chains have their origin in the planar AdS/CFT correspondence, but they also contain the one-dimensional Hubbard model as a ...
Beisert, Niklas
core   +3 more sources

Progress and understanding on geology-drilling engineering-mechanics coupling mechanism of ultra-deep directional wells [PDF]

Youqicang pingjia yu kaifa
Deep and ultra-deep oil and gas exploration and development are key strategic areas in China's energy sector, with ultra-deep directional drilling serving as a crucial technology for accessing these resources.
CHENG Hai,ZHANG Yiqun,WANG Yin,LIU Chao
doaj   +1 more source

Efficient gene delivery to photoreceptors using AAV2/rh10 and rescue of the Rho−/− mouse

Molecular Therapy: Methods & Clinical Development, 2015
As gene therapies for various forms of retinal degeneration progress toward human clinical trial, it will be essential to have a repertoire of safe and efficient vectors for gene delivery to the target cells.
Arpad Palfi, Naomi Chadderton, Mary O'Reilly, Kerstin Nagel-Wolfrum, Uwe Wolfrum, Jean Bennett, Peter Humphries, Paul Kenna, Sophia Millington-Ward, Jane Farrar   +9 more
doaj   +1 more source

Negative clean rings

Analele Stiintifice ale Universitatii Ovidius Constanta: Seria Matematica, 2022
A ring is called negative clean if the negative (i.e., the additive inverse) of each clean element is also clean. Clean rings are negative clean.
Călugăreanu Grigore, Pop Horia F.
doaj   +1 more source

Quasi Exactly Solvable 2$\times$2 Matrix Equations

, 1993
We investigate the conditions under which systems of two differential eigenvalue equations are quasi exactly solvable. These systems reveal a rich set of algebraic structures. Some of them are explicitely described.
P. Kosinski, Ushveridze A. G., Ushveridze A. G., Y. Brihaye   +3 more
core   +1 more source

2×2 operator matrix with real parameter and its spectrum [PDF]

E3S Web of Conferences
In the present paper we consider a linear bounded self-adjoint 2×2 block operator matrix Aμ (so called generalized Friedrichs model) with real parameter μ ∈ R.
Dilmurodov Elyor B., Tosheva Nargiza A., Turayeva Nabiya A., Karamatov Bolatbek T., Shokirova Durdona Sh.   +4 more
doaj   +1 more source

Jacobsons Lemma fails for nil-clean 2 × 2 integral matrices

Analele Stiintifice ale Universitatii Ovidius Constanta: Seria Matematica, 2020
We show that for two 2 × 2 integral matrices A, B, if the product AB is nil-clean then BA may not be nil-clean. Despite the fact that for many special cases, BA is also nil-clean, we finally found three counterexamples.
Călugăreanu Grigore, Pop Horia F.
doaj   +1 more source

Singular matrices that are products of two idempotents or products of two nilpotents

Special Matrices, 2021
Over commutative domains we characterize the singular 2 × 2 matrices which are products of two idempotents or products of two nilpotents. The relevant casees are the matrices with zero second row and the singular matrices with only nonzero entries.
Călugăreanu Grigore
doaj   +1 more source

Exact Results in N_c=2 IIB Matrix Model [PDF]

, 1997
We investigate N_c=2 case of IIB matrix model, which is exactly soluble. We calculate the partition function exactly and obtain a finite result without introducing any cut-off.
Suyama, T., Tsuchiya, A.
core   +2 more sources