检索结果-南通市图书馆

FUNCTIONAL COEFFICIENT AUTOREGRESSIVE CONDITIONAL ROOT MODEL

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Systems Science & Complexity 2012年第5期25卷 998-1013页

作者： Jianjun ZHOU min chen School of Mathematics and Statistics Yunnan University Academy of Mathematics and Systems Science Chinese Academy of Sciences

This paper proposes an extended model based on ACR nmdel： Functional coefficient autoregressive conditional root model （FCACR）. Under some assumptions, the authors show that the process is geometrically ergodic, stationary and all moments of the process exist. The authors use the polynomial spline function to approximate the functional coefficient, and show that the estimate is consistent with the rate of convergence Op（hv＋1 ＋ n-1/3）. By simulation study, the authors discover the proposed method can approximate well the real model. Furthermore, the authors apply the model to real exchange rate data analysis.

关键词： Ergodicity functional coefficient polynomial spline function.

Controlling the Ring-Opening Polymerization Process Using External Stimuli

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemistry 2020年第3期38卷 282-286页

作者： min chen Changle chen CAS Key Laboratory of Soft Matter Chemistry Hefei National Laboratory for Physical Sciences at the MicroscaleDepartment of Polymer Science and EngineeringUniversity of Science and Technology of ChinaHefeiAnhui 230026China

Through the incorporation of stimuli-responsive units,the properties of ring-opening polymerization catalysts can be efficiently modulated using external *** article summarizes some of the recently reported strategies that control the ring-opening polymerization of cyclic type monomers,using allosteric,redox,Lewis acid/base,supramolecular,electrochemical and light *** strategies enable the fine tuning of the polymerization process and the microstructure/composition of the final polymeric products.

关键词： polymerization Polymerization enable

Unifying quantum heat transfer and superradiant signature in a nonequilibrium collective-qubit system:A polaron-transformed Redfield approach

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

Chinese Physics B 2019年第5期28卷 48-56页

作者： Xu-min chen chen Wang Department of Physics Hangzhou Dianzi University Department of Physics Zhejiang Normal University

We investigate full counting statistics of quantum heat transfer in a collective-qubit system constructed by multiqubits interacting with two thermal baths. The nonequilibrium polaron-transformed Redfield approach embedded with an auxiliary counting field is applied to obtain the steady state heat current and fluctuations, which enables us to study the impact of the qubit–bath interaction in a wide regime. The heat current, current noise, and skewness are all found to clearly unify the limiting results in the weak and strong couplings. Moreover, the superradiant heat transfer is clarified as a system-size-dependent effect, and large number of qubits dramatically suppress the nonequilibrium superradiant signature.

关键词： quantum transport heat conduction phonons or vibrational states in low-dimensional structures and nanoscale materials nonequilibrium and irreversible thermodynamics

Optimal Dividend Payout for Classical Risk Model with Risk Constraint

在线全文

学校读者我要写书评

暂无评论

Acta Mathematicae Applicatae Sinica 2014年第3期30卷 721-734页

作者： Shu-min chen School of Management Guangdong University of Technology

In this paper we consider the problem of maximizing the total discounted utility of dividend payments for a Cramer-Lundberg risk model subject to both proportional and fixed transaction costs. We assume that dividend payments are prohibited unless the surplus of insurance company has reached a level b. Given fixed level b, we derive a integro-differential equation satisfied by the value function. By solving this equation we obtain the analytical solutions of the value function and the optimal dividend strategy when claims are exponentially distributed. Finally we show how the threshold b can be determined so that the expected ruin time is not less than some T. Also, numerical examples are presented to illustrate our results.

关键词： optimal dividend risk constraint classical risk model fixed transaction cost

Cortical Representation of Pain and Touch:Evidence from Combined Functional Neuroimaging and Electrophysiology in Non-human Primates

在线全文

学校读者我要写书评

暂无评论

Neuroscience Bulletin 2018年第1期34卷 165-177页

作者： Li min chen Departments of Radiology and Radiological Sciences and Psychology Institute of Imaging Science Vanderbilt University Medical Center

Human functional MRI studies in acute and various chronic pain conditions have revolutionized how we view pain, and have led to a new theory that complex multi-dimensional pain experience （sensory-discriminative, affective/motivational, and cognitive） is represented by concurrent activity in widely-distributed brain regions （termed a network or pain matrix）. Despite these break- through discoveries, the specific functions proposed for these regions remain elusive, because detailed electrophys- iological characterizations of these regions in the primate brain are lacking. To fill in this knowledge gap, we have studied the cortical areas around the central and lateral sulci of the non-human primate brain with combined submillimeter resolution functional imaging （optical imaging and fMRI） and intracranial electrophysiological recording. In this mini-review, I summarize and present data showing that the cortical circuitry engaged in nociceptive processing is much more complex than previously recognized. Electrophysiological evidence supports the engage- ment of a distinct nociceptive-processing network within SI （i.e., areas 3a, 3b, 1 and 2）, SII, and other areas along the lateral sulcus. Deafferentation caused by spinal cord injury profoundly alters the relationships between fMRI and electrophysiological signals. This finding has significant implications for using fMRI to study chronic pain conditions involving deafferentation in humans.

关键词： Nociception Non-human primate Cortex Functional MRI Functional connectivity

Regularity of Solutions to Elliptic Equations with VMO Coefficients

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2004年第6期20卷 1103-1118页

作者： Ye min chen LMAM School of Mathematical SciencePeking University

The aim of this paper is to study the regularity of solutions to the Dirichlet problems for general second-order elliptic equations in Lebesgue and Morrey *** consider both non- divergence and divergence forms and the... 详细信息

关键词： Regularity Elliptic equations VMO

Insights into carbon dioxide sequestration into coal seams through coupled gas flow-adsorption-deformation modelling

在线全文

学校读者我要写书评

暂无评论

Journal of Rock Mechanics and Geotechnical Engineering 2024年第1期16卷 26-40页

作者： Hywel Thomas min chen Geoenvironmental Research Centre Cardiff School of EngineeringCardiff UniversityQueen’s BuildingsThe ParadeNewport RoadCardiffCF243AAUK Key Laboratory of Marine Geology Tongji UniversityShanghai200092China

Injecting carbon dioxide(CO_(2))into coal seams may unlock substantial carbon sequestration *** the coal acts like a carbon filter,it can preferentially absorb significant amounts of CO_(2).To explore this further,desorption of the adsorbed gas due to pressure drop is investigated in this paper,to achieve an improved understanding of the long-term fate of injected CO_(2) during post-injection *** paper presents a dual porosity model coupling gas flow,adsorption and geomechanics for studying coupled processes and effectiveness of CO_(2) sequestration in coals.A new adsorption?desorption model derived based on thermodynamics is incorporated,particularly,the desorption hysteresis is *** reliability of the proposed adsorption-desorption isotherm is examined via validation *** is indicated that occurrence of desorption hysteresis is attributed to the adsorption-induced pore *** injection ceases,the injected gas continues to propagate further from the injection well,while the pressure in the vicinity of the injection well experiences a significant *** the adsorbed gas near the well also decreases,this decrease is less compared to that in pressure because of desorption *** unceasing spread of CO_(2) and drops of pressure and adsorbed gas depend on the degree of desorption hysteresis and heterogeneity of coals,which should be considered when designing CO_(2) sequestration into coal seams.

关键词： CO_(2)geological storage Coal seam Adsorption Desorption hysteresis

Is the Cape Stone Forest in Shantou City formed by wave erosion? A comparison of the pedestal rocks on the coasts and the mountains of Queshi in eastern Guangdong, China

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

Journal of Mountain Science 2024年第5期21卷 1447-1463页

作者： chen min WANG Wei School of Geography South China Normal UniversityGuangzhou 510631China

Cape Stone Forest is a group of granite rock pillars(pedestal rocks) towering over Shilin Lake, on the southern shore of Shantou Bay in eastern Guangdong, China. The rock pillars were previously identified as sea stacks because they have marine notch-like concave sidewalls at their base, and more importantly, the lake is immediately adjacent to the bay, which is exposed to the open sea. However, rock pillars similar in shape and size can also be found at the top of Queshi Mountain, which is only about 300 meters northwest of the lake and about 85 meters above sea level. Therefore, the marine origin of Cape Stone Forest is seriously questioned. In this study, 3D imagery and drone technology were used to collect data in the investigations without direct manual measurements in the water or on the mountain. It shows that the concave sidewalls of the rock pillars in the lake and on the mountains occur at different heights and are exposed to different directions, while a natural sea stack on Mayu Island at the mouth of Shantou Bay has a horizontal notch parallel to the sea level, although the granite rock of the sea stack is the same as that of the lake and the mountains. The eastern side of the island, where the sea stack is located, is exposed to the open sea but blocks large waves for the rock pillars in the lake. Therefore, the origin of Cape Stone Forest cannot be explained by wave-based mechanisms. The only satisfactory explanation that takes into account all the field evidence is that the narrow rock pillars of the lake and mountain were formed by chemical weathering that penetrated closely the spaced joints of the granite rock, and the notch-like concave sidewalls were formed by more effective chemical weathering at the base of the pillars.

关键词： Pedestal rock Granite Closely spaced joints Wave erosion Chemical weathering

Testing for Error Correlation in Semi-Functional Linear Models

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Science & Complexity 2023年第4期36卷 1697-1716页

作者： YANG Bin chen min ZHOU Jianjun Yunnan Key Laboratory of Statistical Modeling and Data Analysis Yunnan UniversityKunming 650091China City College Kunming University of Science and TechnologyKunming 650051China School of Mathematical Sciences Shanxi UniversityTaiyuan 030006China Academy of Mathematics and Systems Science Chinese Academy of SciencesBeijing 100190China

Existing methods for analyzing semi-functional linear models usually assumed that random errors are not serially correlated or serially correlated with the known ***,in some applications,these assumptions on random errors may be unreasonable or *** this end,this paper aims at testing error correlation in a semi-functional linear model(SFLM).Based on the empirical likelihood approach,the authors construct an empirical likelihood ratio statistic to test the serial correlation of random errors and identify the order of autocorrelation if the serial correlation *** proposed test statistic does not need to estimate the variance as it is data adaptive and possesses the nonparametric version of Wilks'*** studies are conducted to investigate the performance of the proposed test *** real examples are illustrated by the proposed test method.

关键词： Empirical likelihood error correlation functional principal component analysis semifunctional linear model spline estimation Wilks'theorem