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Resistance Calculation of pentagonal Lattice Structure of Resistors

Communications in Theoretical Physics 2019年第8期71卷 935-938页

作者： M.Q.Owaidat J.H.Asad Department of Physics Al-Hussein Bin Talal University P.O. Box 20 Ma’an 71111 Jordan Department of Physics College of Applied Sciences Palestine Technical University P.O. Box 7 Tulkarm Palestine

In this study, the effective resistance between any two lattice sites in a two-dimensional pentagonal lattice structure of identical resistors is determined by means of the lattice Green’s function *** numerical resu... 详细信息

关键词： lattice Green’s function pentagonal lattice resistance numerical results

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Evidence for pentagonal symmetry in living and model cellular systems

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Natural Science 2011年第10期3卷 866-883页

作者： John J. Wille 不详

Microscope observations of normal human ke- ratinocytes (NHK) propagated in a serum-free medium reveal a high frequency (>70%) of pentagonally-shaped colonies over a wide range of colony sizes that persist over many sequential cell generations. NHK colonies derived from sin- gle cell isolates also display pentagonal symme- try as confirmed by a photographic technique known as “Markham Rotation”. The generality of pentagonal cellular morphology was extended to observations in situ of pentagonally-shaped basal layer epidermal cells of normal human epidermis, monolayer cultures of normal and immortalized keratinocytes, several different ch- ick embryo cells, and in previously published photographs. Statistical methods were applied that differentiate planar close-packing of polygonal configurations observed in living cellular system from several examples of non-living cellular aggregates that were produced spontaneously in nature or in the laboratory under defined physico-chemical conditions.

关键词： Cells Colonies in Vitro Tissue Culture Mammalian Tissues Model Tissues pentagonal Symmetry Rotational Symmetry Analysis

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Dielectric Loading on Multi-Band Behaviors of pentagonal Fractal Patch Antennas

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Open Journal of Antennas and Propagation 2013年第3期1卷 49-56页

作者： Ravindra Kumar Yadav Jugul Kishor R. L. Yadava Department of Electronics and Communication Engineering Galgotia’s College of Engineering and Technology Greater Noida India Department of Electronics and Communication Engineering ITS Engineering College Greater Noida India Department of Electronics and Communication Engineering JRE School of Engineering Greater Noida India

This paper describes the multiband behaviour as well as the response for dielectric loading of a pentagonal fractal patch antenna designed at frequency f = 2.45 GHz. The proposed antenna shape has been obtained by introducing slots in a pentagonal patch antenna up to second iteration. Detailed design steps and results of the designs are studied and investigated in this paper. Simulated and measured results reveal that the antenna will be operated at three different frequency bands—2.17 GHz, 3.56 GHz, and 7.93 GHz with acceptable performances (i.e. VSWR < 2). The measured results for the antennas are in good agreement with simulated results. The proposed antenna maintains good radiation pattern with gain. However dielectric loading increases its radiation efficiency at the cost of significant decrease in gain and directivity.

关键词： Fractal Patch Antenna Multiband pentagonal Patch and Dielectric Loading

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The Fractal and the Recurrence Equations Concerning the Integer Partitions

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Advances in Pure Mathematics 2018年第6期8卷 624-630页

作者： Meng Zhang School of Computer and Information Engineering Tianjin Chengjian University Tianjin China

This paper introduced a way of fractal to solve the problem of taking count of the integer partitions, furthermore, using the method in this paper some recurrence equations concerning the integer partitions can be ded... 详细信息

关键词： Fractal Integer Partition pentagonal Number Theorem Recurrence Equations

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