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Acta Mathematica Sinica,English Series 2014年第5期30卷 723-736页

作者： Jin Song wu wen ming wu School of Mathematical Sciences University of Science and Technology of China Department of Mathematics Chongqing Normal University

In this paper, we will estimate an upper bound for the similarity degree of the crossed product of a hyperfinite finite von Neumann algebra by weakly compact action of an infinite discrete group. We will also improve ... 详细信息

关键词： Similarity degree von Neumann algebra weakly compact action compact action crossed product

On Monotone Product of Operator Algebras

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Acta Mathematica Sinica,English Series 2007年第3期23卷 491-496页

作者： wen ming wu Li Guang WANG Department of Mathematical Science University of Tsinghua Beijing 100084 P. R. China Department of Mathematics Qufu Normal University Qufu 273165 P. R. China

In this note, we give complete descriptions of the structure of the monotone product of two yon Neumann algebras and two C^＊-algebras. We show that the monotone product of two simple yon Neumann algebras and C^＊-algebras aren＇t simple again. We also show that the monotone product of two hyperfinite yon Neumann algebras is again hyperfinite and determine the type of the monotone product of two factors.

关键词： factor von Neumann algebras monotone product C^*-algebras GNS construction

Weakly Approximate Diagonalization of Homomorphisms into Finite von Neumann Algebras

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Acta Mathematica Sinica,English Series 2024年第9期40卷 2187-2194页

作者： wen Hua QIAN Jun Hao SHEN wen ming wu School of Mathematical Sciences Chongqing Normal UniversityChongqing 401331P.R.China Department of Mathematics and Statistics University of New HampshireDurhamNH 03824USA

Let A be a unital C^(∗)-algebra and B a unital C^(∗)-algebra with a faithful traceτ.Let n be a positive *** give the definition of weakly approximate diagonalization(with respect toτ)of a unital homomorphismφ:A→Mn(B).We give an equivalent characterization of McDuff Ⅱ_(1) *** show that,if A is a unital nuclear C^(∗)-algebra and B is a type Ⅱ_(1) factor with faithful traceτ,then every unital^(∗)-homomorphism φ:A→M_(n)(B)is weakly approximately *** B is a unital simple infinite dimensional separable nuclear C^(∗)-algebra,then any finitely many elements in Mn(B)can be simultaneously weakly approximately diagonalized while the elements in the diagonals can be required to be the same.

关键词： Weakly approximately diagonalizable McDuff factors nuclear hyperfinite

Surjective L^(2)-isometries on the Projection Lattice

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Acta Mathematica Sinica,English Series 2021年第5期37卷 825-834页

作者： Li Guang WANG wen ming wu Wei YUAN School of Mathematical Sciences Qufu Normal UniversityQufu 273165P.R.China School of Mathematical Sciences Chongqing Normal UniversityChongqing 401331P.R.China Institute of Mathematics Academy of Mathematics and Systems ScienceChinese Academy of SciencesBeijing 100190P.R.China School of Mathematical Sciences University of Chinese Academy of SciencesBeijing 100049P.R.China

Recently,Gehér and Semrl have characterized the general form of surjective isometries of the set of all projections on an infinite-dimensional separable Hilbert space using unitaries and *** this paper,we study the surjective L^(2)-isometries of the projection lattice of an infinite dimensional Hilbert space and show that every such isometry can also be described by unitaries and antiunitaries.

关键词： Wigner's theorem L^(2)-isometries projections tracial weight

A novel polymer gel with high-temperature and high-salinity resistance for conformance control in carbonate reservoirs

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Petroleum Science 2022年第6期19卷 3159-3170页

作者： Wei-Peng wu Ji-Rui Hou ming Qu Yu-Long Yang Wei Zhang wen-ming wu Yu-Chen wen Tuo Liang Li-Xiao Xiao Unconventional Petroleum Research Institute China University of PetroleumBeijing102249China Sinopec Northwest Oilfield Company UrumqiXinjiang830000China

Plugging agents have been widely used to enhance oil recovery in fractured-vuggy carbonate ***,the harsh conditions of fractured-vuggy carbonate reservoirs yield a significant challenge in maintaining a long-term stabilization of plugging *** this work,we developed an anti-hightemperature and high-salinity polymer gel(APG)with excellent resistance to high temperature(140℃)and ultra-high salinity(240000 mg/L).The rheology and microstructure of APG were characterized before and after *** plugging tests on fractured cubic cores were conducted to quantify the plugging performance of the gel *** results showed that the Sclerglucan and Cobalt(Ⅱ)Chloride Hexahydrate filled the three-dimensional(3-D)network with various morphologies,providing extra protection to the cross-linking points of the 3D network structure of APG and thus,leading to a prolongation of the dehydration *** dehydration rate of APG was only 5%within 30days,and the strength of APG could be maintained at a rigid or near-rigid level over 150 ***,APG exhibited satisfactory shear and scour *** plugging tests showed that APG could achieve a plugging rate of 90%and demonstrate ignorable minor damage to the *** results indicate that APG can serve as a great candidate in channel plugging in fractured-vuggy carbonate reservoirs where fractures are fully developed.

关键词： Conformance control Fractured-vuggy reservoir High temperature High salinity Thermal stability

Advances in understanding the molecular mechanism of pancreatic cancer metastasis

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Hepatobiliary & Pancreatic Diseases International 2016年第4期15卷 361-370页

作者： Yong-Xing Du Zi-wen Liu Lei You wen-ming wu Yu-Pei Zhao Department of General Surgery Peking Union Medical College Hospital Chinese Academy of Medical Sciences and Peking Union Medical College

BACKGROUND： Pancreatic cancer（PC） is usually diagnosed at the late-stage and therefore, has widespread metastasis and a very high mortality rate. The mechanisms underlying PC metastasis are not well understood. Recent advances in genomic sequencing have identified groups of gene mutations that affect PC metastasis, but studies elucidating their roles are lacking. The present review was to investigate the molecular mechanisms of PC *** SOURCES： Relevant articles on PC metastasis were searched in MEDLINE via Pub Med prior to April 2015. The search was limited in English ***： PC metastatic cascades are multi-factorial events including both intrinsic and extrinsic elements. This review highlights the most important genetic alterations and other mechanisms that account for PC invasion and metastasis, with particular regard to epithelial-mesenchymal transition, inflammation, stress response, and circulating tumor ***： Analyses of relevant gene functions and signaling pathways are needed to establish the gene regulatory network and to define the pivotal modulators. Another promising area of study is the genotyping and phenotyping of circulating tumor cells, which could lead to a new era of personalized therapy by identifying specific markers and targets.

关键词： pancreatic cancer metastasis molecular mechanism targeted therapy

Diagnostic accuracy of K-ras mutation for pancreatic carcinoma:a meta-analysis

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Hepatobiliary & Pancreatic Diseases International 2013年第5期12卷 458-464页

作者： Shang-Long Liu Ge Chen Yu-Pei Zhao wen-ming wu Tai-Ping Zhang Department of General Surgery Peking Union Medical College HospitalChinese Academy of Medical Sciences and Peking Union Medical College

BACKGROUND:The conventional tests for the diagnosis of early stage pancreatic carcinoma are not *** metaanalysis is to evaluate the accuracy of K-ras mutation for the diagnosis of pancreatic *** SOURCES:A systemic search of all relevant literature was performed in Web of Science,EMBASE,Cochrane Database,and MEDLINE(PubMed as the search engine) prior to June 1,***-four studies fulfilled the inclusion criteria and data were pooled for ***:The pooled estimates for K-ras mutation in diagnosis of pancreatic carcinoma were as follows:sensitivity 0.68(95% CI:0.66-0.71),specificity 0.87(95% CI:0.85-0.88),positive likelihood ratio 4.54(95% CI:3.47-5.94),negative likelihood ratio 0.37(95% CI:0.30-0.44) and diagnostic odds ratio 14.90(95% CI:10.02-22.15).Summary receiver operating characteristic analysis demonstrated that the maximum joint sensitivity and specificity was 0.79,and the overall area under the curve was ***:Diagnostic accuracy of K-ras mutation was not superior to that of conventional ***,K-ras mutation analysis alone is not recommended for the diagnosis of pancreatic carcinoma.

关键词： cancer diagnosis K-ras pancreatic carcinoma meta-analysis

Layer-Wise Pre-Training Low-Rank NMF Model for Mammogram-Based Breast Tumor Classification

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Journal of the Operations Research Society of China 2019年第4期7卷 515-537页

作者： wen-ming wu Xiao-Hui Yang Yun-Mei Chen Juan Zhang Dan Long Li-Jun Yang Chen-Xi Tian Data Analysis Technology Lab Institute of Applied MathematicsSchool of Mathematics and StatisticsHenan UniversityKaifeng 475004HenanChina Department of Mathematics University of FloridaGainesvilleFL 32611USA Zhejiang Cancer Hospital Hangzhou 310022China

Image-based breast tumor classification is an active and challenging *** this paper,a robust breast tumor classification framework is presented based on deep feature representation learning and exploiting available information in existing *** representation learning of mammograms is fulfilled by a modified nonnegative matrix factorization model called LPML-LRNMF,which is motivated by hierarchical learning and layer-wise pre-training(LP)strategy in deep ***-rank(LR)constraint is integrated into the feature representation learning model by considering the intrinsic characteristics of ***,the proposed LPML-LRNMF model is optimized via alternating direction method of multipliers and the corresponding convergence is *** completing classification,an inverse projection sparse representation model is introduced to exploit information embedded in existing samples,especially in test *** on the public dataset and actual clinical dataset show that the classification accuracy,specificity and sensitivity achieve the clinical acceptance level.

关键词： Breast tumor classification Mammogram LPML-LRNMF Inverse space sparse representation ADMM

Effect of Blumgart anastomosis in reducing the incidence rate of pancreatic fistula after pancreatoduodenectomy

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World Journal of Gastroenterology 2019年第20期25卷 2514-2523页

作者： Ya-Tong Li Han-Yu Zhang Cheng Xing Cheng Ding wen-ming wu Quan Liao Tai-Ping Zhang Yu-Pei Zhao Meng-Hua Dai Department of General Surgery Peking Union Medical College Hospital

BACKGROUND Pancreatic fistula is one of the most serious complications after pancreatoduodenectomy for treating any lesions at the pancreatic head. For years, surgeons have tried various methods to reduce its incidence. AIM To investigate and emphasize the clinical outcomes of Blumgart anastomosis compared with traditional anastomosis in reducing postoperative pancreatic fistula. METHODS In this observational study, a retrospective analysis of 291 patients who underwent pancreatoduodenectomy, including Blumgart anastomosis (201 patients) and traditional embedded pancreaticojejunostomy (90 patients), was performed in our hospital. The preoperative and perioperative courses and longterm follow-up status were analyzed to compare the advantages and disadvantages of the two methods. Moreover, 291 patients were then separated by the severity of postoperative pancreatic fistula, and two methods of pancreaticojejunostomy were compared to detect the features of different anastomosis. Six experienced surgeons were involved and all of them were proficient in both surgical *** The characteristics of the patients in the two groups showed no significant differences, nor the preoperative information and pathological diagnoses. The operative time was significantly shorter in the Blumgart group (343.5 ± 23.0 vs 450.0 ± 40.1 min, P = 0.028), as well as the duration of pancreaticojejunostomy drainage tube placement and postoperative hospital stay (12.7 ± 0.9 d vs 17.4 ± 1.8 d, P = 0.031;and 21.9 ± 1.3 d vs 28.9 ± 1.3 d, P = 0.020, respectively). The overall complications after surgery were much less in the Blumgart group than in the embedded group (11.9% vs 26.7%, P = 0.002). Patients who underwent Blumgart anastomosis would suffer less from severe pancreatic fistula (71.9% vs 50.0%, P = 0.006), and this pancreaticojejunostomy procedure did not have worse influences on long-term complications and life quality. Thus, Blumgart anastomosis is a feasible pancreaticojejunost

关键词： Blumgart anastomosis Pancreaticojejunostomy Postoperative pancreatic fistula Pancreatoduodenectomy Incidence