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Search Results: 1 - 10 of 85095 matches for " CHEN Kai "
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Test Study on Navigation in the First Construction Period of Lize Navigation-Power Junction  [PDF]
Kai Chen
Engineering (ENG) , 2016, DOI: 10.4236/eng.2016.86030
Abstract: Based on the test results of Lize navigation-power junction construction diversion through the normal fix-bed model with the scale of 1:100, the navigation flow condition in each construction diversion period is studied. There are a lot of problems in the first construction diversion period, such as excessive flow velocity, poor flow pattern, low navigation discharge and so on. To solve these problems, the comprehensive engineering measures for improving the navigation flow condition during construction are put forward. Among them, the structure forms of construction diversion cofferdam are optimized. Finally, the highest safe navigation discharge and reasonable navigation route are proposed. The experimental results obtained from the optimization scheme of the first construction diversion period are better than these from the original scheme in terms of flow velocity, flow pattern and so on. The research results may serve as reference for similar engineering.
Some Hermite-Hadamard Type Inequalities for Differentiable Co-Ordinated Convex Functions and Applications  [PDF]
Kai-Chen Hsu
Advances in Pure Mathematics (APM) , 2014, DOI: 10.4236/apm.2014.47044
Abstract:

In this paper, we shall establish an inequality for differentiable co-ordinated convex functions on a rectangle from the plane. It is connected with the left side and right side of extended Hermite-Hadamard inequality in two variables. In addition, six other inequalities are derived from it for some refinements. Finally, this paper shows some examples that these inequalities are able to be applied to some special means.

Chains of Unusual Excellent Local Rings
Kai Chen
Mathematics , 2003,
Abstract: Let (T,M) be a complete local domain containing the integers. Let p1 \subseteq p2 \subseteq ... \subseteq pn be a chain of nonmaximal prime ideals T such that T_pn is a regular local ring. We construct a chain of excellent local domains An \subseteq A1 such that for each i, the completion of Ai is T, the generic formal fiber of Ai is local with maximal ideal pi, and if I is a nonzero ideal of Ai then Ai/I is complete. Consequently, if in addition T is a UFD, then we can construct a chain of excellent local UFDs satisfying the same conditions.
Integrin Targeted Delivery of Chemotherapeutics
Kai Chen, Xiaoyuan Chen
Theranostics , 2011,
Abstract: Targeted delivery of chemotherapeutics is defined in the sense, that is, to maximize the therapeutic index of a chemotherapeutic agent by strictly localizing its pharmacological activity to the site or tissue of action. Integrins are a family of heterodimeric transmembrane glycoproteins involved in a wide range of cell-to-extracellular matrix (ECM) and cell-to-cell interactions. As cell surface receptors, integrins readily interact with extracellular ligands and play a vital role in angiogenesis, leukocytes function and tumor development, which sets up integrins as an excellent target for chemotherapy treatment. The peptide ligands containing the arginine-glycine-aspartic acid (RGD), which displays a strong binding affinity and selectivity to integrins, particularly to integrin αvβ3, have been developed to conjugate with various conventional chemotherapeutic agents, such as small molecules, peptides and proteins, and nanoparticle-carried drugs for integtrin targeted therapeutic studies. This review highlights the recent advances in integrin targeted delivery of chemotherapeutic agents with emphasis on target of integrin αvβ3, and describes the considerations for the design of the diverse RGD peptide-chemotherapeutics conjugates and their major applications.
Modal Resistance of Spiral Antenna  [PDF]
Teng-Kai Chen, Gregory H. Huff
Journal of Electromagnetic Analysis and Applications (JEMAA) , 2013, DOI: 10.4236/jemaa.2013.55036
Abstract:

This paper proposes a quasi-static conformal mapping analysis to analytically evaluate the input resistance of Archimedean spiral antenna at its radiation region. The deviation from the original constructs of band theory for two-wire spiral antennas leads to the concept of common slot-line mode radiation. The per-unit-length capacitance and the characteristic impedance of the quasi-TEM fundamental propagating mode in periodic coplanar waveguide (PCPW) structure are obtained in terms of spiral parameters including substrate properties. This formula enables little computational effort on the computation of input resistance at the radiation mode of balanced-excited two-arm Archimedean spiral antennas. The numerical simulation demonstrates the accuracy of derived formulas both in free space and when a dielectric layer is presented.

Fatigue Life Analysis of Fixed Structure of Posterior Thoracolumbar Pedicle Screw  [PDF]
Tong Yang, Kai Chen, Yonggui Lv
Engineering (ENG) , 2013, DOI: 10.4236/eng.2013.510B060
Abstract:

In order to analyze the fatigue life of the posterior thoracolumbar fixed structure, a loading model was established in accordance with the anti-fatigue test requirements specified by ASTM Standard F1717-04. Two three-dimensional Models of the fixed structure with two bars and four bars were built by 3D software (UG), and imported into ANSYS software for static analysis. The maximum and minimum stresses of risk nodes under different loads and moments were obtained. The fatigue life was then calculated using relevant mathematical formula of S-N curve and Goodman curve. It was found that the stress at the middle of the crossbeam between the two bars is larger than the surroundings and is liable to suffer from fatigue.

A Voice Coil Powered Controllable Micro-Jet Injection System  [PDF]
Kai Chen, Laiwu Miao, Zhigang Feng
Journal of Biomedical Science and Engineering (JBiSE) , 2015, DOI: 10.4236/jbise.2015.89059
Abstract: A medical device of micro-jet injection for drug delivery is described in this paper. The device is powered by a Lorentz force driver (or voice coil motor, VCM) and is able to perform pulsed injection through controlling the direction of the current passing through the device. The driving force and the resulting injection pressure are also controllable through control of the current intensity of the VCM. A physical model was established by combining the existing jet injection model with the relationship of the driving force obtained from a finite-element-method (FEM) analysis, and was verified by experimental measurements. The numerical calculation of the physical model reveals the relationship between the injection pressure and the current intensity of VCM under system conditions. In normal cases, the injection dose can be varied. Thus the relationship between the current intensity of VCM and the dose value was numerically obtained under the condition for the maximum injection pressure to be above a threshold value. These results can be used for optimization of the device.
Existence of Periodic Solutions for a Class of Difference Systems with p-Laplacian
Kai Chen,Qiongfen Zhang
Abstract and Applied Analysis , 2012, DOI: 10.1155/2012/135903
Abstract: By applying the least action principle and minimax methods in critical point theory, we prove the existence of periodic solutions for a class of difference systems with p-Laplacian and obtain some existence theorems.
Existence of Periodic Solutions for a Class of Asymptotically -Linear Discrete Systems Involving -Laplacian
Kai Chen,Qiongfen Zhang
Journal of Applied Mathematics , 2012, DOI: 10.1155/2012/948345
Abstract: By applying Mountain Pass Theorem in critical point theory, two existence results are obtained for the following asymptotically -linear -Laplacian discrete system Δ(|Δ(?1)|?2Δ(?1))
6-Benzyl-2-[(triphenyl-λ5-phosphanylidene)amino]-4,5,6,7-tetrahydrothieno[2,3-c]pyridine-3-carbonitrile
Hong Chen,Kai Yan
Acta Crystallographica Section E , 2011, DOI: 10.1107/s1600536811035082
Abstract: In the title compound, C33H28N3PS, the P atom has a distorted tetrahedral PNC3 environment, formed by the N atom and three aryl rings. No intermolecular hydrogen-bonding interactions or π–π stacking interactions are present in the crystal structure.
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