Table of Content

30 April 2017, Volume 23 Issue 2

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Telocytes involvement in recovery after myocardial infarction

2017, 23(2):  155-160.  doi:10.3969/j.issn.1007-2861.2017.02.004

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Myocardial infarction (MI) is a disorder that lowers the lifespan and quality of life. Reperfusion treatment as early as possible is the most effective solution, with an increased focus on post-MI medication. In the recovery process after MI, telocytes (TCs) appear to play an important role, which develops a large number of questions awaiting answers. Defining possible signaling mechanisms involved in recovery after MI may lead to identification the limits of current therapies, and development of new therapeutic solutions.

Exosomes in the precision diagnosis and treatment of cancer

HU Muren1, CHEN Ting2, YANG Changqing3, GE Bujun1

2017, 23(2):  161-168.  doi:10.3969/j.issn.1007-2861.2017.02.003

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Exosomes are nanoscale vesicle with a double lipid membrane structure, and can be secreted by almost all types of cells. Exosomes can carry nucleic acids and proteins, and play important roles in a variety of physiological and pathological processes especially in cell communication and signal transduction. Tumor cell-derived exosomes have been proved to be involved in the regulation of tumor growth, invasion and metastasis process. Exosomes’ roles in the early diagnosis, prognosis prediction and therapeutics have been a hot topic. This review summarizes the role of exosomes in the development and metastasis of cancer, and its potential function in the individually precise treatment.

Advancement of photosensitizers for photodynamic therapy

HAN Xiaobo, ZHENG Yinghong, YANG Liming

2017, 23(2):  169-178.  doi:10.3969/j.issn.1007-2861.2017.01.007

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This paper reviews the main types of photosensitizers in photodynamic therapy(PDT). PDT has been widely used in the treatment of tumors and non neoplastic diseases since its invention. In a photochemical reaction, a material is called photosensitizer if it can be activated by light with energy transferred to reactants without reaction. Photosensitizer is an important impact factor in PDT, and its research progress is important in the development of PDT. Photosensitizer has three generations: the first dominated by hematoporphyrin derivative, the second represented by porphyrin and porphin, and the third being modification of the second generation chemical groups. After decades of development, chemical properties of photosensitizer has become stable with less side effects.

A GMRES-Inout algorithm for computing PageRank problems

GU Chuanqing, SHAO Chenchen

2017, 23(2):  179-184.  doi:10.3969/j.issn.1007-2861.2016.07.010

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The PageRank algorithm for determining the importance of Web pages has become a central technique in Web search. Based on the inout method, a GMRESInout algorithm which modifying the inner-outer method preconditioned with the restarted GMRES algorithm is proposed. Description and convergence analysis of the proposed algorithm are given. Numerical results are reported to demonstrate the efficiency of the proposed algorithm.

Properties of polysulfonamide fiber (PSAF)/polytetrafluoroethylene (PTFE) composites

LIU Liqi, WANG Xu, XIE Wang, YU Mingming, FANG Lin, LI Hong, YANG Min, XIAO Yi, REN Musu, SUN Jinliang

2017, 23(2):  185-191.  doi:10.3969/j.issn.1007-2861.2015.05.017

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Polysulfonamide fiber (PSAF)/polytetrafluoroethylene (PTFE) composites were prepared by hot pressing process. The effect of PSAF on material mechanical properties, thermal stability, structure and morphology was studied with thermal gravimetric analyzer(TGA), differential scanning calorimetry (DSC), X-ray diffraction (XRD), Fourier transform infrared (FTIR), and thermal field scanning electron microscope (TFSEM). The results show that PSAF can improve mechanical properties of the composite materials, and the composites have good thermal stability. A moderate amount of PSAF can be well dispersed in the PTFE matrix. Bonding of the PSAF and PTFE matrix interfacial is good, and there is a physical adhesion.

Influence of roasting condition on purification of iron oxide by magnetic separation

SUN Xiaowu, WANG Xingqing, TANG Xiaoquan, SHU Shuqi

2017, 23(2):  192-200.  doi:10.3969/j.issn.1007-2861.2015.04.013

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Scale on the surface of iron in incinerated municipal solid waste scrap as raw materials was purified by roast magnetic beneficiation to produce iron oxide up to industry standard. The effects of reduction roasting, magnetic field strength, particle size and other test conditions on magnetic beneficiation were researched. The results show that magnetite powder with TFe content of 67.61% and 85.17% iron recovery can be obtained by secondary magnetic separation under the conditions of reduction temperature of 750 ℃, reduction time of 60 min, charcoal ratio of 7% and magnetic field strength of 0.10 and 0.08 T, respectively.

Experiment of memory space move technique for double-space storage

ZHAN Haojun, JIN Yi, OUYANG Shan, SHI Yeqiang

2017, 23(2):  201-215.  doi:10.3969/j.issn.1007-2861.2015.01.017

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This work presents an emulation experiment for double-space storage principle and the memory space move technique. The experiment validate feasibility of using nonvolatile random access memory (NVRAM) to build a double-space storage and correctness of the memory space movement technique. The experiment system consists of an 8086CPU, 16 MB double-space storage, and sixteen 8-bit move latches. Two unmovable and fourteen movable window frames are set up. The first instruction and initial program are set in the 255th window that cannot be closed. An interrupt vector table and a move vector table are set in the 254th unclosed window. It has been make sure that the 8086CPU is booted properly, and the initial program, interrupt service routine, read and write memory instruction are executed correctly. Further, access to the 8086CPU’s 1 MB memory can be automatically transformed to the 16 MB double-space memory unit, and the move latches can be modified to map the window frame into a new window wall of the double-space storage. The experimental results lay a foundation for the double-space memory principle and its memory space move technique.

A circular oscillation mechanism with adjustable amplitude

KE Xianxin, XIN Jizhong, YANG Yang

2017, 23(2):  216-224.  doi:10.3969/j.issn.1007-2861.2015.02.008

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As the currently developed oscillation mechanism generally does not have adjustable amplitude, a circular oscillation mechanism with adjustable amplitude is designed. It contains an eccentric motion mechanism and an adaptive dynamic balance mechanism. Dynamic simulation and analysis are carried out on the eccentric motion mechanism. Experimental results show that 0~50 mm adjustable amplitude and 2~36 rad/s adjustable oscillation frequency can be achieved simultaneously. Unbalance quality of the table causing adverse effects can be compensated by the adaptive dynamic balance mechanism to increase life of the die. Its oscillation amplitude can be changed easily, conveniently and quickly, with simplicity, compact mechanism, rigid connection, strong bearing capacity and easy maintenance. It is expected to be used widely in biological engineering.

Torsional vibration and vibration suppression in power drives

YANG Ying, YU Yanpu, HUANG Rui, HAN Bing

2017, 23(2):  225-234.  doi:10.3969/j.issn.1007-2861.2015.03.009

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Torsional vibration causes oscillation and increases mechanical transmission wear. It is a main constraint in improving dynamic performance of drive systems. A parallel resonant circuit theory is used to analyze the mechanism and energy transfer process during torsional vibration. With a quality factor for assessing the degree of harm, torsional torque caused by torsional vibration harmonic content is quantitatively calculated, showing that a large inertia load leads to a great degree of torsional vibration damage, and even a small harmonic torque can cause torque of several dozens of times as large. Torque feedback is introduced to inhibit torsional vibration, and a design method of torque observer with limited bandwidth is presented. The torque feedback control based on observer can raise the resonant frequency. A sensitivity analysis is done for some critical system parameters. The analysis and simulation studies show that the proposed method can suppress resonance.

Distribution and toxic effects of polybrominated diphenyl ethers (PBDEs) in organism

XU Bentuo, WU Minghong, XU Gang

2017, 23(2):  235-243.  doi:10.3969/j.issn.1007-2861.2015.04.012

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Polybrominated diphenyl ethers (PBDEs) are a kind of fire retardant that exists widely in the living environment. PBDEs become a major focus in the environmental science due to the pollution problem. This paper introduces distribution of PBDEs in organism and toxic effects including thyroid toxicity, nervous system toxicity, hepatotoxicity, reproduction and development of toxicity and immune toxicity. The corresponding toxicity mechanism is discussed, providing practical and reliable theoretical supports of biology effect caused by PBDEs, and drawing the public attention to this kind of fire retardant.

Intelligent remote planting system based on cloud platform

GUO Peng1, LI Jun2, ZHANG Haiyan3

2017, 23(2):  244-251.  doi:10.3969/j.issn.1007-2861.2016.02.021

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To solve the problem of lack of time and experience, a leisure agricultural garden is designed. Users can plant remotely by means of cloud computing. Intelligent planting using an expert decision system can also be achieved based on fuzzy control. Using fuzzy clustering and adaptive neuro-fuzzy inference system (ANFIS) to explore the user’s planting data, private ordering of expert decision system can be obtained. Experimental results show that the designed system is effective and reliable.

Super cyclically edge connected graphs with two orbits of the same size

JIANG Haining

2017, 23(2):  252-256.  doi:10.3969/j.issn.1007-2861.2016.05.004

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For a graph G, an edge set F is a cyclic edge-cut if (G−F) is disconnected and at least two of its components contain cycles. If G has a cyclic edge-cut, it is said to be cyclically separable. The cyclic edge-connectivity is cardinality of a minimum cyclic edgecut of G. A graph is super cyclically edge-connected if removal of any minimum cyclic edge-cut makes a component a shortest cycle. Let G = (G₁,G₂, (V₁, V₂)) be a doubleorbit graph with minimum degree δ(G) ≥ 4, girth g ≥6 and |V₁| = |V₂|.  Suppose G_i is k_i- regular, k₁ ≤ k₂ and G₁ contains a cycle of length g, then G is super cyclically edge connected.

Tri-integrable couplings of Dirac hierarchy and its bi-Hamiltonian structure

LI Qian1,2, XIA Tiecheng1

2017, 23(2):  257-266.  doi:10.3969/j.issn.1007-2861.2015.04.022

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Tri-integrable couplings of Dirac hierarchy are obtained based on the enlarged zero curvature equation from semi-direct sums of Lie algebras. Its bi-Hamiltonian structures are then established with variational identity.

Common least-squares solution to some matrix equations

2017, 23(2):  267-275.  doi:10.3969/j.issn.1007-2861.2015.02.012

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Necessary and sufficient conditions are derived for some matrix equations that have a common least-squares solution. A general expression is provided when certain resolvable conditions are satisfied. This research extends existing work in the literature.

An exponent deviation integral algorithm for mixed integer programming

YU Yaru, YAO Yirong

2017, 23(2):  276-289.  doi:10.3969/j.issn.1007-2861.2015.05.010

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This paper studies an exponent deviation integral approach to the mixed integer programming problem. A deviation integral function with good properties is proposed, and the optimality condition for a mixed integer programming problem is examined. Then an exponent deviation integral algorithm is developed. Numerical calculation is performed using the Monte-Carlo technique to show effectiveness and feasibility of the algorithm.

Circadian rhythm in mammal based on phase synchronization

FAN Qingduan1,2, LIU Zengrong1,3

2017, 23(2):  290-297.  doi:10.3969/j.issn.1007-2861.2015.02.005

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A collective rhythm emerges in suprachiasmatic nucleus (SCN) of mammals hypothalamus, controlling the central nervous system and peripheral tissues. To explore the emergence of circadian rhythms, a modified Kuramoto model of the SCN network is established, and its phase synchronization is analyzed. The results show that emergence of circadian rhythm is expressed by phase synchronization. The effect of parameters on order parameter is studied, showing agreements with biological facts. This study provides insights of the mechanism of circadian rhythm.

Flexural behavior of RC beams strengthened with near surface mounted CFRP strips

ZHANG Zhimei, ZHANG Zhenbo, HUANG Haitao, ZHANG Zhenkai, XIONG Hao

2017, 23(2):  298-307.  doi:10.3969/j.issn.1007-2861.2015.02.002

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This paper uses the finite element software ABAQUS for nonlinear finite element analysis of the flexural behavior of reinforced concrete (RC) beams with near-surface mounted (NSM) carbon fiber reinforced polymer/plastic (CFRP) strips. Through simulation of 5 beams with NSM CFRP strips from the test, the experimental and theoretical results were compared to verify accuracy of the model. Using the verified finite element model, the influence of factors were analyzed such as FRP length, groove number, reinforcement method and longitudinal reinforcement ratio on the flexural behavior of RC beams. The results show that the CFRP length and longitudinal reinforcement ratio have a larger impact on the flexural behavior of the RC beams, while the impacts of groove number and reinforcement method are limited. This paper also proposes a boundary reinforcement quantity formula for CFRP strips.

Warning classification of public crisis in a university with improved fuzzy TOPSIS based on α level sets

XU Yang, YU Liying, LIN Chenyan

2017, 23(2):  308-314.  doi:10.3969/j.issn.1007-2861.2015.02.010

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In managing public crisis in a university, it is critical to evaluate warning classification of public crisis. This paper manifests that the warning classification can be measured by elements of crisis itself and the crisis management. Specifically, crisis elements include impact, hazard intensity and proliferation. The crisis management elements include crisis awareness, tolerance and crisis management. Taking these into consideration, a warning classification evaluation system for public crisis in a university is conducted, which has fifteen indexes. Besides, an improved fuzzy technique for order preference by similarity to an ideal solution (TOPSIS) based on level sets is proposed for the warning classification evaluation. Finally five university crisis events are chosen for case analysis.