检索结果-南通市图书馆

Four Forbidden Subgraph Pairs for Hamiltonicity of 3-connected Graphs

在线全文

学校读者我要写书评

暂无评论

Acta Mathematicae Applicatae Sinica 2016年第2期32卷 469-476页

作者： Hou-yuan LIN zhi-quan hu School of Mathematics and quantitative Economics Shandong University of Finance and Economics Faculty of Mathematics and Statistics Central China Normal University

For non-negative integers i,j and k, we denote the generalized net as Ni,j,k, which is a triangle with disjoint paths of length i, j and k, attached to distinct vertices of the triangle. In this paper, we prove that e... 详细信息

关键词： hamiltonian cycle forbidden subgraphs claw-free graphs closure

On a Spanning K-tree Containing Specified Vertices in a Graph

在线全文

学校读者我要写书评

暂无评论

Acta Mathematicae Applicatae Sinica 2019年第4期35卷 919-923页

作者： Fei-fei SONG zhi-quan hu Department of Information & Computational Science He’nan Agricultural University Zhengzhou 450002 China Faculty ofMath & Statistics Central China Normal UniversityWuhan 430079 China

A k-tree is a tree with maximum degree at most k. In this paper, we give a sharp degree sum condition for a graph to have a spanning k-tree in which specified vertices have degree less than t, where 1≤t≤*** denote by σ_k(G) the minimum value of the degree sum of k independent vertices in a graph G. Let k≥2,s≥0 and 1≤t≤k be integers, and suppose G is an(s + 1)-connected graph with σ_k(G)≥|G|+(k-t)*** for any s specified vertices, G contains a spanning k-tree in which every specified vertex has degree at most t. This improves a result obtained by Matsuda and Matsumura.

关键词： spanning tree k-tree (s + 1)-connected graphs degree sum condition specified vertices

Robotic-assisted Laparoscopic Nephrectomy with Vein Thrombectomy:Initial Experience and Outcomes from a Single Surgeon

在线全文

学校读者我要写书评

暂无评论

Current Medical Science 2018年第5期38卷 834-839页

作者： Xin-wen KE Xing ZENG Xian WEI Yuan-qing SHEN Jia-hua GAN Ji-hua TIAN zhi-quan hu Department of Urology Tongji HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuha430030China Department of Urology the Central Hospital of WuhanWuhan 430014China

This study was designed to explore the safety and feasibility of robotic-assisted laparoscopic nephrectomy with vein thrombectomy (RAL-NVT) for the treatment of renal cell carcinoma (RCC)with venous tumor thrombus (VTT).Clinical data of 6 patients treated with RAL-NVT between July 2016 and November 2017 in our hospital were retrospectively collected and *** were 5 males and 1 female with their age ranging from 48 years to 68 *** renal tumors were right-sided and one left-sided. Three cases fell in level 0 VTT,one in level I and two in level Ⅱ.preoperative imaging revealed lymph node involvement in 1 case and distant metastasis in 2 *** RCC with level 0 VTT,the renal vein of the affected side was adequately and carefully dissected around the thrombus to the proximity of inferior vena cava (IVC)and was ligated with Hem-o-loks without cross-clamping the *** level Ⅰ and Ⅱ VTT,the IVC was cross-clamped cephalically and caudally around the tumor thrombus and all tributaries were sequentially blocked to ensure the safe retrieval of *** operations were successfully completed without conversion to open *** mean operative time was 150(115-230)***-clamping of the IVC happened in 3 cases,and the blocking time was 14, 19 and 20min,*** mean estimated blood loss during the operation was 400 (200-580)*** peritoneal drainage tube was removed 5 to 9 days after the operation, and all patients were postoperatively discharged at 6 to 11 *** pathological analysis confirmed that the RCCs were comprised of 4 clear cell RCCs,1 papillary cell RCC,and 1 medullary cell RCC;2 cases were Fuhrman grade Ⅱ,3 cases grade Ⅲ,and 1 case undefined *** recurrence or progression was observed during the follow-up of 4.2(3-6)*** concluded that RAL-NVT is highly challenging but safe and feasible for the treatment of RCC with VTT.

关键词： robotics laparoscopy renal cell carcinoma venous tumor thrombus thrombectomy

Repetitive transcranial magnetic stimulation in Alzheimer’s disease:effects on neural and synaptic rehabilitation

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Neural Regeneration Research 2025年第2期20卷 326-342页

作者： Yi Ji Chaoyi Yang Xuerui Pang Yibing Yan Yue Wu zhi Geng Wenjie hu Panpan hu Xingqi Wu Kai Wang Department of Neurology The First Affiliated Hospital of Anhui Medical UniversityHefeiAnhui ProvinceChina Anhui Province Key Laboratory of Cognition and Neuropsychiatric Disorders HefeiAnhui ProvinceChina Collaborative Innovation Center of Neuropsychiatric Disorders and Mental Health HefeiAnhui ProvinceChina Institute of Artificial Intelligence Hefei Comprehensive National Science CenterHefeiAnhui ProvinceChina Department of Psychology and Sleep Medicine The Second Affiliated Hospital of Anhui Medical UniversityHefeiAnhui ProvinceChina

Alzheimer’s disease is a neurodegenerative disease resulting from deficits in synaptic transmission and *** Alzheimer’s disease brain tends to be hyperexcitable and hypersynchronized,thereby causing neurodegeneration and ultimately disrupting the operational abilities in daily life,leaving patients *** transcranial magnetic stimulation is a cost-effective,neuro-modulatory technique used for multiple neurological *** the past two decades,it has been widely used to predict cognitive decline;identify pathophysiological markers;promote neuroplasticity;and assess brain excitability,plasticity,and *** has also been applied to patients with dementia,because it can yield facilitatory effects on cognition and promote brain recovery after a neurological ***,its therapeutic effectiveness at the molecular and synaptic levels has not been elucidated because of a limited number of *** study aimed to characterize the neurobiological changes following repetitive transcranial magnetic stimulation treatment,evaluate its effects on synaptic plasticity,and identify the associated *** review essentially focuses on changes in the pathology,amyloidogenesis,and clearance pathways,given that amyloid deposition is a major hypothesis in the pathogenesis of Alzheimer’s *** mechanisms associated with repetitive transcranial magnetic stimulation procedures and different pathways mediating gene transcription,which are closely related to the neural regeneration process,are also ***,we discuss the outcomes of animal studies in which neuroplasticity is modulated and assessed at the structural and functional levels by using repetitive transcranial magnetic stimulation,with the aim to highlight future directions for better clinical translations.

关键词： Alzheimer’s disease amyloid deposition apoptotic mechanisms biomarker neural regeneration neurodegeneration repetitive transcranial magnetic stimulation synaptic plasticity

CATALYTIC ACTIVITIES OF RARE-EARTH CALIXARENE COMPLEXES IN POLYMER SYNTHESES

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2005年第6期23卷 593-602页

作者： zhi-quan Shen Institute of Polymer Science Zhejiang University Hangzhou 310027 China

The studies of our group on the catalytic activities of rare earth calixarene complexes in polymer syntheses are reviewed. Rare earth calixarene complexes are effect catalysts for the polymerizations of butadiene, isoprene, ethylene, styrene, propylene oxide, styrene oxide, trimethylene carbonate and 2,2-dimethyl-trimethylene carbonate.

关键词： Rare earth complex Calixarene Polymer synthesis.

Multiple phase detector of M-ary phase shift keying symbols in code division multiple access systems

在线全文

学校读者我要写书评

暂无评论

Journal of Central South University 2011年第4期18卷 1080-1086页

作者： quan zhi Federal University of Juiz de fora Electrical Engineering Juiz de fora MG Brazil Zip

A novel iterative technique, the phase descent search detection was proposed. This technique constrained the solution （PDS） algorithm, for M-ary phase shift keying （M-PSK） symbols to have a unit magnitude and it was based on coordinate descent iterations where coordinates were the unknown symbol phases. The PDS algorithm, together with a descent local search （also implemented as a version of the PDS algorithm）, was used multiple times with different initializations in a proposed multiple phase detector; the solution with the minimum cost was then chosen as the final solution. The simulation results show that for highly loaded multiuser scenarios, the proposed technique has a detection performance that is close to the single-user bound. The results also show that the multiple phase detector allows detection in highly overloaded scenarios and it exhibits near-far resistance. In particular, the detector has a performance that is significantly better, and complexity that is significantly lower, than that of the detector based on semi-definite relaxation.

关键词： coordinate descent complexity M-ary phase shift keying (M-PSK) multiuser detection quadratic optimization semi-definite relaxation

Polymerization of 4-Vinylpyridine by Lanthanide Coordination Catalyst

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2002年第7期13卷 681-682页

作者： Guo hua TAN Yi Feng ZHANG zhi Guo hu zhi quan SHEN Institute of Polymer Science Zhejiang UniversityHangzhou 310027

Polymerization of 4-vinylpyridine was carried out with the lanthanide coordination catalyst. The influence of the component in catalytic system and solvents had been examined. The molecular weight of poly(4-vinylpyr... 详细信息

关键词： Vinylpyridine rare earth coordination catalyst polymerization.

Efficient multiuser detector based on box-constrained deregularization and its FPGA design

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Engineering and Electronics 2012年第2期23卷 179-187页

作者： zhi quan Jie Liu Department of Electrical Engineering Federal University of Juiz de ForaJuiz de Fora 36036900Brazil School of Information Engineering Department of Electronic Information EngineeringZhengzhou UniversityZhengzhou 450001P.R.China RF Engines Limited Newport PO305WBUK

Multiuser detection can be described as a quadratic optimization problem with binary constraint. Many techniques are available to find approximate solution to this problem. These tech- niques can be characterized in terms of complexity and detection performance. The ＂efficient frontier＂ of known techniques include the decision-feedback, branch-and-bound and probabilistic data association detectors. The presented iterative multiuser detection technique is based on joint deregularized and box-constrained so- lution to quadratic optimization with iterations similar to that used in the nonstationary Tikhonov iterated algorithm. The deregulari- zation maximizes the energy of the solution, this is opposite to the Tikhonov regularization where the energy is minimized. However, combined with box-constraints, the deregularization forces the solution to be close to the binary set. We further exploit the box- constrained dichotomous coordinate descent （DCD） algorithm and adapt it to the nonstationary iterative Tikhonov regularization to present an efficient detector. As a result, the worst-case and aver- age complexity are reduced down to K28 and K2~ floating point operation per second, respectively. The development improves the ＂efficient frontier＂ in multiuser detection, which is illustrated by simulation results. Finally, a field programmable gate array （FPGA） design of the detector is presented. The detection performance obtained from the fixed-point FPGA implementation shows a good match to the floating-point implementation.

关键词： multiuser detection dichotomous coordinate descent (DCD) box-constrained DCD deregularization Tikhonov regular- ization low complexity field-programmable gate array (FPGA).

A Note on Integral Structures in Some Locally Algebraic Representations of GL_(2)

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2021年第1期37卷 59-72页

作者： Yong quan hu Morningside Center of Mathematics Academy of Mathematics and Systems Science Chinese Academy of SciencesBeijing 100190P.R.China Chinese Academy of Sciences University of Chinese Academy of SciencesBeijing 100049P.R.China

In the p-adic local Langlands correspondence for GL2(Qp),the following theorem of Berger and Breuil has played an important role:the locally algebraic representations of GL2(Qp)associated to crystabelline Galois representations admit a unique unitary *** this note,we give a new proof of the weaker statement that the locally algebraic representations admit at most one unitary completion and such a completion is automatically *** proof is purely representation theoretic,involving neither(ψ,Γ)-module techniques nor global *** F is a finite extension of Qp,we also get a simpler proof of a theorem of Vignéras for the existence of integral structures for(locally algebraic)special series and for(smooth)tamely ramified principal series.

关键词： Invariant norm diagram