Results 21 to 30 of about 61,101 (268)
Design and Application of Type 20 Quick Assembly Setting Tool
Cejing jishu, 2023 Plug setting tool is one of the key tools for plug and perforating operation in unconventional oil and gas reservoirs such as shale gas and tight sand gas. With the development of multistage fracturing volume stimulation techniques for unconventional oil
LU Yinghui +5 more
doaj +1 more source
Adaptive Extraction Method for Array Acoustic Slowness in Through-Casing Logging
Cejing jishuTo overcome the difficulty of extracting formation acoustic slowness in cased holes when the casing and formation are poorly cemented, and to address the limitation that existing methods rely on prior information such as accurate borehole parameters or ...
ZHANG Yongchao +7 more
doaj +1 more source
Cejing jishu, 2023 In the combined operation of tubing conveyed perforation (TCP) and drill stem test (DST), the perforator generates strong shock and vibration waves during perforation, which propagate around the explosion point through the connection link of the pipe ...
LI Benchi +5 more
doaj +1 more source
Application of Wireline Formation Tester in Moderate and Low Permeability Depleted Zones
Cejing jishu, 2023 Due to the long extraction time, some fault reservoirs in the BURUN oil field have been depleted, resulting in extremely low formation pressure. In forepart of the project, second generation WFT tool is used.
LIU Yingming +3 more
doaj +1 more source
Pediatric Blood &Cancer, EarlyView.ABSTRACT Background Children with acute lymphoblastic leukemia (ALL) are at risk of severe outcomes from SARS‐CoV‐2 (SCV2). In the post‐pandemic context, where most children have been infected with SCV2, there are limited data on whether vaccination remains beneficial in children with ALL.
Janna R. Shapiro +11 more
wiley +1 more source
The Review of Economics and Statistics, 2003 AbstractAlthough economists have long been aware of Jensen's inequality, many econometric applications have neglected an important implication of it: under heteroskedasticity, the parameters of log-linearized models estimated by OLS lead to biased estimates of the true elasticities.
Santos Silva, Joao M C +1 more
openaire +6 more sources
The Role of Hematopoietic Cell Transplantation in Ataxia‐Telangiectasia
Pediatric Blood &Cancer, EarlyView.ABSTRACT Background Ataxia‐telangiectasia (A‐T) is a DNA repair disorder characterized by neurodegeneration, immunodeficiency, and cancer predisposition. Hematopoietic cell transplantation (HCT) is an established therapy in related disorders such as Fanconi anemia (FA) and Nijmegen breakage syndrome (NBS), but its role in A‐T is unclear.
Laila Alkhouli +3 more
wiley +1 more source
Method for Evaluating Formation Fracturing Effect Utilizing Array Acoustic Logging
Cejing jishuFracturing of unconventional oil and gas reservoirs is an effective means to increase oil and gas recovery rate of tight reservoirs. It is also an important part of subsequent exploration and development of oil and gas fields.
LI Siyi +7 more
doaj +1 more source
, 2022 The commonly quoted error rates for QMC integration with an infinite low discrepancy sequence is $O(n^{-1}\log(n)^r)$ with $r=d$ for extensible sequences and $r=d-1$ otherwise. Such rates hold uniformly over all $d$ dimensional integrands of Hardy-Krause variation one when using $n$ evaluation points.
Owen, Art B., Pan, Zexin
openaire +2 more sources
Pediatric Blood &Cancer, EarlyView.ABSTRACT Background Pediatric sarcomas are a heterogeneous group of tumors that contribute disproportionately to cancer mortality in children. Although congenital anomalies are among the strongest known risk factors for childhood cancer, the risk of specific sarcoma subtypes among affected individuals has not yet been thoroughly evaluated. Procedure We
Russ Wolters +17 more
wiley +1 more source