Table of Content

12 October 2013, Volume 41 Issue 5

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Preparation and Photocatalytic Property of Nano Cuprous Oxide and Its Composites

XU Gui-ping，QIU Li

2013, 41(5):  5-8. 

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Cu₂O powders and TiO₂-Cu₂O composite powders were prepared by chemical deposition method. With prepared Cu₂O nanoparticles as photocatalyst，photocatalytic oxidation degradation of methylene blue solution was explored. The effects of dosage of H₂O₂，the initial concentration of methylene blue and composite samples on the degradation performance were investigated with UV-visible spectrophotometer. The results showed that the degradation efficiency was the best when the amount of H₂O₂ was 5mL in 30mL methylene blue solution and the initial concentration of methylene blue was 10mg / L，and the catalytic efficiency of TiO₂-Cu₂O composite powders was much higher than that of Cu₂O.

Preparation of High Stability Microcapsules for Smart Self-healing Polymer Materials

WANG Hai-ping， HU Si-qian， ZHU Jin-feng， CAI Shao-jun

2013, 41(5):  9-12. 

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Towards the self-healing of polymer material，chooses dicyclopentadiene（DCPD）as core，adopts melamine-urea-formaldehyderesin as wall meterial，to fabricate the microcapsules. The properties of microcapsules，including the particle size，the surface morphology，the thermal properties and the chemical structure，are analysed by using laser particle size analyzer，optical-photographic microscope（OM），microcomputer differential thermal balance and Fourier transform infrared spectroscopy（FT-IR），respectively. Meanwhile，the effects of the feed capacity of core material，emulsifier content and emulsifying speed on the preparation of microcapsules are discussed. Experimental results indicate that the highest core content of the resultant microcapsules is about 90wt.% and the average diameter in volume of the microcapsules is in the range of 50～70 μm，which can be adjusted by changing processing parameters.

Recent Progress in Asymmetric Organocatalytic Cascade Reactions Catalysed with Chiral Second Amines

WANG Liang，LU Zhen

2013, 41(5):  13-19. 

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Organocatalytic asymmetric cascade reaction is one of efficient method for construction of complexe molecular due to its environmentally friendly，atomic economy，higly efficiency and selectivity，and has become an important research subject in organic synthesis. Recently，tremendous achievements have been made in asymmetric organocatalytic cascade reactions by chiral second amine derivatives. According to the mechanism and the action of catalyst in the reaction，from two activated modes which are imine-enamine and enamine-imine，the applications of various chiral second amine derivatives to asymmetric organocatalytic cascade reactions are reviewed.

Influence on Rats' Histopathology Under Exposing of Short Chain Chlorinated Paraffins

LI Xun，LIU Yu-chen，CHEN Min-jie，LI Jia，LIANG Yong

2013, 41(5):  20-25. 

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Objective：Chooses two chlorinated paraffins products which contain different content of short chain chlorinated paraffins（SCCP）as model compound（CPsⅠ，38.22% and CPsⅡ，0.08%），compares their influence on SD male rats after continuously 14 days being exposed through oral intragastric administration，according to that，to explore whether there is special toxicity of SCCP or not.Methods：The exposing concentration are 10，50， 100 （CPsⅠ），100 （CPsⅡ）mg/kg，respectively. Results：After being exposed under two chlorinated paraffins，there is no obvious influence on food intaking and weight. CPsⅠ and CPsⅡ acute exposing，can cause hepatocyte swelling，hydropic degeneration，cytoplast loosen；and renal tubule swelling，glomerulus atrophy，glomerulus hyalinosis；and alveolar septum incrassation，inflammatory cell infiltration；and so on histopathology changes. Conclusion：Acute chlorinated paraffines exposing has toxicity to SD male rats，the effect has no significant relationship with the content of SCCP.

An Iterative Algorithm for Reflexive Optimal Approximation Solutions of Matrix Equations AXB + CX^TD = E

YANG Jia-wen

2013, 41(5):  26-30. 

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Presents an iterative algorithm to compute the optimal approximation solutions of the generalized Sylvester matrix equations AXB + CX^TD = E over reflexive（anti-reflexive）matrices with the hybrid steepest descent method. Whether the matrix equations AXB + CX^TD = E are consistent or not，for arbitrary initial reflexive（anti-reflexive）matrix X₀ ，the given algorithm can be used to compute the reflexive（anti-reflexive）optimal approximation solutions X . The effectiveness of the proposed algorithm is verified by two numerical examples.

Note on Symbol Tracking Algorithm of Linear Programming

TANG Cang-xin，GAO Pei-wang

2013, 41(5):  31-34. 

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Points out the symbol tracking algorithm of linear programming in fact is a variant of the first stage simplex algorithm，the obtained basis has four possibilities，and illustrates with counter-examples. Beginning with the initial basis，for the normal running of symbol tracking algorithm，verifies and complements the steps of the algorithm. To further test the computational performance of symbol tracking algorithm，carries on big scale numerical test with MATLAB programming on computer. The results show that the symbol tracking algorithm averagely spends more executive time for each iteration and the computing efficiency is lower compared to the classical simplex algorithm.

Probability of Ruin and Approachable Estimate of Claim Sum Obeying χ² Distribution

XU Lu，CHEN Cai-gang，FU Xiao-lan

2013, 41(5):  35-39. 

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With establishing a suitable mathematical model， the classical probability theory is used to derive the explicit expression of the last probability of ruin of insurance company that the claim sum obeying the χ² distribution model，and its approachable estimate is obtained. The conclusions improved the results of literature［1］and［8］.

Combined Probability of Erlang （2）Risk Model Without Interest Rate

YU Guo-sheng

2013, 41(5):  40-43. 

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Researches the Erlang （2）risk model without interest rate，the combined probability of the instantaneous surplus before ruin and the deficit at ruin are obtained.

Hydrothermal Synthesis and Photocatalytic Properties of Beta-Bi₂O₃ Nano-sheets

TIAN Yu，ZHANG Zhuang-zhuang，ZHU Xiao-long

2013, 41(5):  44-47. 

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β-Bi₂O₃ nanosheets were synthesized by the hydrothermal method with Bi （NO₃）₃·5H₂O and aquafortis as raw material，and added strong aqua ammonia as mineralizer. The materials were characterized by XRD and SEM，analysed the impact of experimental parameters on composition and morphology of the samples，and evaluated the photocatalytic performance of the sample.The results showed the β-Bi₂O₃ nano-sheets has high catalytic activity to methyl orange photocatalytic degradation.

Trajectory Analysis of Muon Catalysed Fusion in Femto-second Laser Field

SU Jin，SHI Chun-hua，YUAN Xiao-yan

2013, 41(5):  48-51. 

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Based on the interaction of laser and dense plasma，discusses the trajectory of muon in mixture in femto-second laser field after muon catalysed fusion reaction. Here，deals with the mixture after muon catalysed fusion reaction as dense plasma，as the intervention of polarized laser beam，the muon drifts regularly. The results show that：when peak value of laser reaches 10²¹W/cm²，the muon has biggish drifts on the orientation of laser，it can penetrate the surface layer of the mixture，and separate from the fusion product，becomes to the free particle，the process is very short，much less than one laser pulse period. The same parameter laser intervention has very slight influence on other particles. On certain degree，it avoids the catalyst muon being catched by α -particle after catalysed fusion reaction and loses the catalytic ability，thus improves the catalytic efficiency.

Buck Dimmable LED Driving Circuit System

LI Xiang，LING Wei-jie

2013, 41(5):  52-57. 

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To adapt the development of LED lighting technology，the quality of the light，luminous efficiency，reliability，and simplification of the design，based on introducing the function of SSL2108 driving chip，designs a new dimmable LED driving system based on SSL2108. The system mainly composed with four parts：input circuit，buck circuit，dimming control circuit，output circuit. Experimental results show that the circuit can work properly and meet the designing goal.

Design of Portable Type TSP Sampler

ZHAO Pei-yu，LIU Li-ming

2013, 41(5):  58-61. 

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A portable type TSP sampler is designed according to the market demand. The sampler uses STC12C5A60S2，an enhanced 51 core SCM as controller，customized section type large screen LCD as displayer. Automatic constant flow sampling is achieved with using the chip of HX711，a 24 bit A/D converter，and M1210，a differential pressure sensor，and uses the flow differential signal to control the air pump.

Determination of Center and Radius of Clusters with Approaching Method

HAN Hai

2013, 41(5):  62-64. 

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The clustering method based on Euclidean distance usually leads to spherical cluster. It is very difficult to compute the center and radius of the spherical cluster. Proposes a algorithm to determine the two parameters with gradually approaching method. The theoretical analysis and experimental results both show that the algorithm reaches the demand of precision.

Design and Implementation of University Intelligent Terminal Platform Based on Mobile Learning

XU Ping，LUO Kun

2013, 41(5):  65-71. 

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In the field of education，wireless mobile technology facilitates a new kind of learning styles，namely mobile learning. How to apply mobile technology has become a hot field of educational technology. Designs and implements an university mobile learning system. The system is based on the Android mobile learning terminal，and supported by unified education resources platform.This system allows learners to access information at anytime，anywhere and to carry out information processing and interactive session. The system can infinitely extend university student learning time and place. The system's main function modules include information retrieval module，mobile e-mail module，mobile learning group module based on socket，learning materials library module based on mobile web services.

Species Diversity of Ceratopteris Pteridoides Community at Hubei Longgan Lake National Wetland Nature Reserve in Hubei

DONG Yuan-huo，LEI Gang，GAO Wei，LI Shu-Hua，WANG Gui-Xiong

2013, 41(5):  72-75. 

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Species diversity of the endangered aquatic fern Ceratopteris pteridoides community at Hubei Longgan Lake national wetland nature reserve in China were surveyed using sample plot and α－diversity index. The main results are as follows：there were 11 plant species belonging to 10 families and 10 genera in the community in 2011，among which Zizania. Caduciflora， Hydrochai rsdubia，Eichhornia crassipes，Polygonum hydropiper，Ceratophyllum demersum and Lemna minor were dominant species. The vegetation was called Zizania caduciflora-Hydrochai rsdubia Ass. α－diversity index analysis revealed that Simpson index （D），Shannon-Wiener diversity index （H′），and Pielou evenness index（J）were 0. 846、 1. 939 and 0. 809，respectively，indicating low levels of spe? cies diversity at the community. Human disturbance might be the main factor responsible for the reduction of aquatic vegetation and biodiversity. Both establishing conservation spots and changing spots conservation are two important conservation strategies of the species.

Relationship Between Fiber Length and Hemostasis of Self-assembled Peptide RADA16-1

LI Jia-nan，ZHONG Xiao-zhong，WANG Ting

2013, 41(5):  76-80. 

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Objective： A self-assembled small peptide RADARADARADARADA （RADA16-1）can form a long fiber hydrogel，which has the function of surgical hemostasis，to explore the long fiber assemble dynamics and hemostasis mechanism of peptide RADA16-1. Methods： Through circular dichroism spectrum，atomic force characterization and rheological mechanics analysis，kinetics of long fiber self-assemble had been studied. Hemostatic models of spinal cord injury and liver trauma were established to study the effect of blooding control. Results：The results of circular dichroism spectrum indicated that RADA16-1 in solution was beta folding characteristics both before and after ultrasound. The results of atomic force characterization and rheological mechanics analysis showed that RADA16-1 can self-assemble into long fiber which length was about（786. 34 ± 96. 54）nm，and the long fiber assembled process of RADA16-1 was positively associated with time after ultrasound. Meanwhile，a negative correlation was detected between the long fiber length and the bleeding time in animal models. Conclusion：The small peptide RADA16-1 solution can rapidly situ hydrogelize to long fiber form，can be used in surgery as hemostatic.

Expression and Significance of PTEN， EGFR and GH in Endometriosis and Ectopic Malignant Change Endometrium

WANG Cheng-xin，ZHOU Hong-yan，HUANG Xuan，LIU Li-jiang

2013, 41(5):  81-85. 

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Objective： To study the expression and significance of PTEN， EGFR（epidermal growth factor receptor）and GH（human growth hormone）in endometriosis （EMs），malignant transformed endometrium of EMs and investigate the malignant mechanisms and the characteristics of EMs. Methods：Immunohistochemical S-P method was used to examine the expressions of PTEN，EGFR and GH in the eutopic，ectopic and ectopic malignant transformed endometrium of EMs. Results：The positive rate of PTEN in eutopic，ectopic and ectopic malignant transformed endometrium of EMs of 24 cases were 66. 67％ （16/24），37. 50％ （9/24）and 20. 00％ （1/5）respectively，the positive rate in ectopic and ectopic malignant transformed endometrium of EMs was lower than that of eutopic endometrium and there was statistical difference（P < 0. 05），nevertheless the positive rate between ectopic and ectopic malignant transformed endometrium of EMs had no statistical difference（P＞0. 05）which indicated that the biologic characteristic of the two lesions were similar；The positive rate of GH in eutopic，ectopic and ectopic malignant transformed endometrium of EMs were 87. 18%（102/117），85. 38% （111/130） and 80. 00% （4/5） respectively；The positive rate of EGFR in eutopic，ectopic and ectopic malignant transformed endometrium of EMs were 54. 70% （64/117），89. 23%（116/130）and 80. 00%（4/5）respectively，the positive rate in ectopic and ectopic malignant transformed endometrium of EMs were higher than that of eutopic endometrium. The positive rate of EGFR and GH in ectopic and ectopic malignant transformed endometrium of EMs were similar. Therefore suggested the diagnostic criteria of aEM（atypical endometriosis） and malignant change of EMs. Conclusion：Endometriosis possesses some features of neoplasm such as adhesion，invasion，metastasis and can transform to malignant tumor. GH， EGFR and PTEN play important role in occurrence，development and malignant transformation of EMs. Especially the down regulation or loss of PTEN accompanied simultaneously with the high expression of GH and EGFR can be viewed as the important malignant transformation mark.

Investigation and Analysis of Influencing Factor on Treatment Acceptance of OSAHS Patients Treated with CPAP

MENG Qing-hua，LI Cheng-hong，JIANG Cheng，KONG Bin，FENG Qiong

2013, 41(5):  92-95. 

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Objective： To explore the influencing non-technical factors on treatment acceptance of obstructive sleep apnea hypopnea syndrom （OSAHS）patients treated with continuous positive airway pressure （CPAP），and searches the solution. Methods： Choosed 153 patients with OSAHS from March 2010 to March 2012，investigation the cognition degree and treatment intentionality of patients to OSAHS，conducted statistical analysis with investigation results. Results： The cognition degree of patients to OSAHS was still on low level，the proportion was 53.6% for holding OSAHS as disease，and 47.8% patients thought it need treatment. 47.8% patients agreed to use CPAP treatment，the agreement was higher for AHI>15 and 35-55 years old（60% and 56.45% respectively），the main reasons for disagreement were the price of respirator，the feeling of unsafety，inconvenjence，discomfort，or preference for operation，among them，especially the price of respirator. Reliability measuring scale showed the high score had high proportion，on added questions，90% choosed negative answers. Conclusion： The cognition degree is low for OSAHS patients to disease，the acceptance is bad，the high price of respirator and low trust rate to doctors are important influencing factors on treatment acceptance of OSAHS patients.

Clinical Observation of Comprehensive Therapy of Physiatry Combined with Erigeron Breviscapus and Aescine in Treatment of Cervical Spondylotic Radiculopathy

WEI Cong-bing

2013, 41(5):  96-98. 

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Objective：To study the efficacy of comprehensive therapy of physiatry combined with breviscapine-asarum and aescin in the treatment of cervical spondylotic radiculopathy. Methods：82 patients of cervical spondylotic radiculopathy were randomly divided into the control group and the observation group with 41 cases in each group. The patients in observation group were treated with breviscapine-asarum and aescin after physiatry therapy，and the patients in control group were treated with breviscapine-asarum and aescin，the results were analysed. Results：The cure rate was 36.6% and the markedly effective rate was 56.1% in the observation group，compared with 26.8%， 43.9% in the control group. The difference was statistically significant between the two groups（P < 0.01） . The efficacy of observation group was obviously better than control group. Conclusion：Physiatry therapy combined with breviscapine-asarum and aescin in the treatment of cervical spondylotic radiculopathy can significantly improve the patient's clinical symptoms and improve the curative effect.

Assessment and Coping Strategy to University Students with ADHD

YOU Xiao-nan，WANG Cheng-xin

2013, 41(5):  99-104. 

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Regarded just as children's or adolescent symptom，attention deficit hyperactivity disorder （ADHD）is in fact frequently seen in adults，students as well，which is not paid enough attention to in our country，especially when students have mild symptoms like emotion disorder and implicit disabilities. Analyses the mutiple causes of ADHD in adults and students. Twords different types，including implicit type，carries on all-round evaluation on disease history，neuropsychology，psychological education and emotional fluctuation. Twords the special demands of students，proposes proper intervention and coping strategy，so relieves the influence of emotion disorder，and removes the damage of ADHD to individual，family and society.

Reform and Practice on Course Teaching for Mechanical Manufacturing-related Majors Under“3+1”Personnel Training Pattern

PENG He-ping

2013, 41(5):  105-108. 

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Reconstruction of curricular system for undergraduate course in machinery or relevant major field under the“3+1”personnel training pattern is discussed；the measures of teaching reform on related courses and practice links are proposed. The implementation of“3+1”personnel training pattern is an innovation to the existing training mechanism of undergraduate course majored in machinery，which can improve engineering practical and innovational abilities of undergraduates.

Reform and Practice in Teaching Process of Chemical Engineering Technology

WANG Jin-huang，WU Yu-qiong

2013, 41(5):  109-112. 

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In the course of chemical engineering technology teaching，in order to stimulate students' interest and potential，so as to gradually develop their engineering quality and innovation capacity，based on the nature and characteristics of the course，make full use of ammonia model，professional experimental apparatus，chemical simulation software and other teaching resources，utilize a variety of teaching methods such as heuristic，discussion，research type，case type and so on. Uses lectures，self-study，group discussions and speeches，visits，design and simulation operation，to carry out teaching activities. With comprehensive examination model to comprehensively evaluate the students' quality and ability，it is generally favored by majority of students.