18 May 2013, Volume 31 Issue 14

    

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  Preparation of Perlite-phosphorylated Polyvinyl Alcohol Based Biomaterial and Its Degradation Characteristics of Atrazine

  LIU Na;WANG Liu;QIU Hua;YU Ying;WANG He;ZHU Bolin

  . 2013, 31(14): 15-21. https://doi.org/10.3981/j.issn.1000-7857.2013.14.001

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  Atrazine has become a research hot spot for many years due to its universality, high pollution, and difficult degradation. In the recent years, much research has been done on Atrazine. All sorts of degradation methods have been found. Among them, the bio-degradation is the most effective. Based on atrazine-degrading bacterium, immobilization method, and some materials, a new study is conducted. A kind of biologically active material, namely, perlite-phosphorylated polyvinyl alcohol (perlite-PPVA) is prepared with modified polyvinyl alcohol (PVA) by using phosphate, perlite, and atrazine-degrading bacterium: Pseudomonas W4. The effect of the material on the degradation of atrazine is discussed under the optimal preparation conditions and the other different reactive conditions.The results show that the best preparation conditions are perlite (particle sizeis 0.60-2.00mm)/10% PVA (V/V) =35/65, Pseudomonas W4 embedded volume is 1g/L, phosphate density is 1.25mol/L of perlite-PPVA. External carbon source and phosphorus source are able to promote its degradation ability of atrazine. The effect of perlite-PPVA on the atrazine degradation is better when the pH is in the range of 5.99-9.03, its ability of anti-acid is also better than the free bacterium. It shows that perlite-PPVA is feasible for the removal of atrazine, and could be used as a new material applied to the degradation of atrazine in waste water or soil after further research.
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  Clinical Effect of Recombinant Adenovirus-p53 Combined with Hyperthermia for Advanced Soft Tissue Sarcoma

  XU Gang;XIAO Shaowen;LIU Changqin;SUN Yan;CAI Yong;SU Xing;LI Dongming;SHI Anhui;YU Rong;TIE Jian;ZHU Guangying;XU Bo;ZHANG Shanwen

  . 2013, 31(14): 22-25. https://doi.org/10.3981/j.issn.1000-7857.2013.14.002

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  In order to evaluate the efficacy and safety of recombinant adenovirus-p53 (rAdp53) combined with hyperthermia for advanced soft tissue sarcoma, from Nov. 2001 to Jun. 2012, 30 patients with advanced soft tissue sarcoma enrolled in the clinical study on Gendicine combined with hyperthermia or hyperthermia plus radiotherapy. Gendicine, recombinant adenovirus-p53, is an E1 substituted replication-incompetent recombinant adenovirus encoding the human wild-type p53 gene. Thirty patients were intratumorally injected or intra-abdominal cavity perfused with Gendicine solution of 1×10¹²VP (Virus Particle) once a week with a total eight times on average. Two days after injection, all patients were combined with hyperthermia usually once or twice a week for total eight times on average. Among them, 12 patients were concurrently added with irradiation with the conventional fractionation of 2Gy/f, five fractions a week to a total dose of 16 Gy-70 Gy/8 times-35 times/2 weeks-8 weeks, 56.3Gy on average. Patients were monitored for adverse event and tumors were monitored for response. Two months after treatment, the effective rate was performed by the immediate response rate on CT at the validation point. Among the 30 patients, tumor mass shrinks more than 50% in the nine cases,25%~50% in eight cases,less than 25% in 12 cases, nidus growth in one case. One year survival rate is (58.6±0.091)%,2 year survival rate is (22.4±0.079)%,3 year survival rate is (11.2±0.069)%, and 4 year survival rate is (5.6±0.052)%. Thirty patients with advanced soft tissue sarcoma have received hyperthermia and multiple intratumorally injection of Gendicine, dose-limiting toxicity and adverse events are not noted, except transient fever after Gendicine administration in one case. The treatment with intratumoral injecting of Gendicine combined hyperthermia for advanced soft tissue sarcoma is safe and effective. The results support that rAdp53 is a potentially effective gene therapeutic agent for the soft tissue sarcoma treatment.
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  Impact of Savda Granule on the Ability of Memory and Antioxidation for APP/PS1 Double Transgenic Mice

  UPUR Halmurat;DANG Ming;AIZEZI Renaguli;WUSHOUER Palidan;KURBAN Abdukadir;AMAT Nurmuhammat

  . 2013, 31(14): 26-29. https://doi.org/10.3981/j.issn.1000-7857.2013.14.003

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  In order to study the effect of savda granule on memory and antioxidation ability for APP/PS1 double transgenic mice, a number of three-month-old APP/PS1 double transgenic mice were randomly divided into five groups. Meanwhile, the mice with negative control were served as a control group. There were eight mice in each group and all of them were intragastrically administered for six months. Then the learning and memory ability of mice were detected by Morris water maze test. The activities of glutathione peroxidase-(GSH-Px) and superoxide in the brain tissue were measured with spectrophotometer. Comparing with the control group, APP/PS1 double transgenic mice significantly prolong the latency for searching the hidden platform in the directional swimming test, and decrease the time spent on swimming in the target quadrant with the probe test. Comparing with APP/PS1 double transgenic mice, savda granule is able to dose-dependently shorten the latency for searching the hidden platform in the directional swimming test, and increase the time spent on swimming in the target quadrant with the probe test. The activities of GSH-Px and SOD decrease in APP/PS1 double transgenic mice, while in the groups with savda granule treatment, the activities of GSH-Px and SOD raise, and there is significant difference comparing with Alzheimer's Disease (AD) model group. Nine-month-old APP/PS1 double transgenic mice present imitated learning and memory dysfunction with the reduction of antioxidation ability; savda granule is able to ameliorate the impaired memory function for the mice with AD and improve their antioxidation ability.
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  Heat Transfer Analysis of Annular Fluidized Bed Biomass Pyrolysis Reactor

  WANG Xiao;SI Hui;CHENG Qi

  . 2013, 31(14): 30-35. https://doi.org/10.3981/j.issn.1000-7857.2013.14.004

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  Annular fluidized bed reactor possesses a compact structure and higher thermal efficiency, having a good application prospect. The analysis on the heat transfer inside annular fluidized bed is presented. First, the analytic method has been used. In order to study steady heat transfer in the reactor, a kind of computational model is established. And then the C language is used for programming and solving the process. As the result, the relationship between various parameters of reactor and fluidized gas velocity is carried out. With the numerical method, the heat loss per unit length and temperatures on the each wall of the reactor are obtained by simulation. These values are related with the speeds used in the analytic method, respectively. These results have been compared with the analytic one. The results show that the heat transfer coefficients increase with the rise of fluidized gas velocity. The temperature on the outer wall of combustion chamber decreases, meanwhile the temperature on the outer wall of insulation layer increases. The heat loss per unit length is also on the rise. All above results are obtained with the fluidized gas velocity ranged from 0.02m/s to 0.24m/s. Comparing with the conventional reactor, the heat loss of an annular fluidized bed reactor is much lower. And the results of both methods are consistent with each other. These two methods provide useful guidance for analyzing the effect of heat transfer in a fluidized bed reactor.
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  Unsteady Numerical Simulation for Gas-liquid Two-phase Flow in the Self-priming Process of Centrifugal Pump

  HUANG Si;YUE Le;GUO Jing;WANG Li

  . 2013, 31(14): 36-40. https://doi.org/10.3981/j.issn.1000-7857.2013.14.005

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  A common vertical self-priming centrifugal pump was selected as the research object. By using unsteady numerical simulation, the transient gas-liquid two-phase flow in the self-priming centrifugal pump during the self-priming process is explored. The main innovation in the simulation is that a section of the suction pipe filled with air is chosen as the initial condition, consisting with the actual self-priming conditions. The gas-liquid two-phase distribution as well as the pressure and velocity in relation to the time are computed and analyzed. The flow rates of both phases with time at the pump inlet and outlet are obtained based on the simulation, which could be used to estimate the self-priming time and other performance parameters. It is found that most of the gas are inhaled into and exhausted out of the pump during the early stage of the self-priming process. The air void fraction could reach at 30.9% and 20.2%, respectively at the impeller inlet and the pump outlet at some moments. The hole on the volute plays a significant role for gas exhaustion during the self-priming process. The air flow rate of the orifice accounts for 20%-25% of the entire air flow rate. The simulation method and results proposed have certain theoretical and engineering values for analyzing self-priming process and performance of self-priming pump.
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  Wellbore Stability Problem of Jinzhou 25-1 Oil Field

  YU Baohua;YAN Chuanliang;DENG Jingen;LIU Shujie;TAN Qiang;ZHU Haiyan

  . 2013, 31(14): 41-45. https://doi.org/10.3981/j.issn.1000-7857.2013.14.006

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  The wellbore instability of Jinzhou 25-1 oil field is quite serious. In order to decrease wellbore instability of the oil field, the clay mineral of shale is identified by the X-ray diffractometer. Laboratory experiments involving the rock mechanics and hydration characteristics of shale are conducted to study their rock mechanical characters and wellbore instability mechanism. Shale in Shahejie Formation has two types: they are bedding shale and water-sensitive shale. Strength of bedding shale is anisotropy, and is prone to shear failure along the bedding plane and causes wellbore instability. Water-sensitive shale would be hydration swelling under the action with drilling fluid, resulting in the change of mechanical properties around the well, showing a changed collapse pressure with the time. Based on the experimental results, the methods to determine collapse pressure are developed, which is applied to determine collapse pressure of Jinzhou 25-1 oil field, and engineering strategies for ensuring safe drilling are given. Based on optimized well trajectory and proper drilling fluid density, the problem involving the wellbore instability of the oil field is able to solve by increasing the plugging and inhibitory of drilling fluid.
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  Physical Properties of Crude Oil in A Oilfield of Gabon and the Evaluation of Paraffin Inhibitor

  ZHANG Suobing;ZHAO Mengyun;LIN Xin;ZHANG Rusheng;MA Yusheng;ZHANG Zuguo

  . 2013, 31(14): 46-49. https://doi.org/10.3981/j.issn.1000-7857.2013.14.007

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  The physical properties of Gabon oil were characterized by analyzing paraffin content, pour point, viscosity, wax precipitation point, and yield value of six wells oil samples from Gabon A oilfield. All of the indicators are key points to the crude oil rheological properties. The results show that the crude oil of Gabon A oilfield is the crude oil containing high wax and high pour points. High carbon component accounts for a large portion of the paraffin components; paraffin content is above 34.04%, average pour point is 28.25℃, average wax precipitation point is 47.51℃, average yield value is 159.11Pa. For the oil samples of TST-B09H and NZOB-Z05H, the ratio of paraffin inhibition is over 90%, 80%, respectively by adding FLO-1 paraffin inhibitor of 100×10^-4. The data obtained provides a direct theoretical support for Gabonese crude oil extraction, transportation, processing, and for the on site work of wax prevention and cleaning of oil well, particularly for screening chemical agents for wax control.
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  Establishment and Mechanism Analysis on an Equivalent Mathematical Model for Foam Flooding

  WANG Guozhuang;ZHANG Qi

  . 2013, 31(14): 50-52. https://doi.org/10.3981/j.issn.1000-7857.2013.14.008

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  With foam is widely used in the oil extraction, various methods involving the numerical simulation of foam flow in porous media are appeared. Therefore, the research on the characteristics and mechanism of the foam in the oilfield is definitely necessary. Based on the physical properties of foam, coalescence mechanism and oil displacement mechanism of foam flooding, an equivalent mathematical model of the technology is developed. The parameters for the model are corrected by the value of the resistance factor. The solution of the mathematical model is obtained by using IMPES method. Through the typical example, the equivalent mathematical model is proven to be feasible. The calculation conditions for the typical example are given. Double tube core flooding is simulated, and then the displacement effects between foam flooding and non-foam flooding are compared with each other. The core pressures of water flooding and foam flooding, saturation distributions as well as flooding efficiency are compared, the model is proven. The results show that the foam possesses a good plugging capacity to the layer with high permeability and the oil recovery could be efficiently enhanced by the foam flooding.
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  Evaluation Method for Node Importance of Information System Networks Based on Edge-Betweenness

  XIONG Jinshi;LI Jianhua;SHEN Di;WANG Gang

  . 2013, 31(14): 53-55. https://doi.org/10.3981/j.issn.1000-7857.2013.14.009

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  It is an important content to evaluate the importance of network nodes in the research of complex network. A mathematical model for evaluating the key nodes of information system network is constructed in the light of the defects that node degree is unevenly emphasized and supporting function of edge to its correspondent nodes is ignored in the importance evaluation of complex network nodes. The concept of edge-betweenness is introduced in the person of the supporting function of edge to its correspondent nodes based on node degree, the mathematical model reflecting the joint function of node degree and edge-betweenness is formed. The simulation results by means of certain information system network demonstrate the effectiveness of the model for evaluating the importance of complex network nodes.
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  Health Prediction of Civil Aircraft Hydraulic System Based on the LS-SVM Regression Under Bayesian Evidence Framework Model

  ZHANG Tiangang;HOU Xiaoyun

  . 2013, 31(14): 56-60. https://doi.org/10.3981/j.issn.1000-7857.2013.14.010

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  In order to predict the health of civil aircraft hydraulic system, based on the LS-SVM regression under Bayesian evidence framework model, the Radial Basis Function (RBF) kernel is used. The LS-SVM regression parameters are selected and tuned, the model algorithm and interval prediction formula are selected, and then the prediction model of hydraulic system is built by the train sample, the validation of formula is verified by the test sample. The parameters of hydraulic system are predicted, and then the predicted values are put into the health assessment model. The results show that the LS-SVM regression under Bayesian evidence framework model is able to be well applied to the health prediction of civil aircraft hydraulic system.
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  Geometric Representation of Fundamental Theorem of Vector

  LI Fenyong;ZHANG Jingang

  . 2013, 31(14): 61-63. https://doi.org/10.3981/j.issn.1000-7857.2013.14.011

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  This paper studies the geometry problems with a pure vector tool. The geometry and vector problems can be transformed into each other, and this paper establishes the corresponding vector geometry theory to completely solve this transformation problem, covering the Cartesian coordinate method. A new, independent, complete mathematics system is formed, which leads to a lot of new methods and problems. From a geometric point of view to generalize the fundamental vector theorem, the fundamental vector theorem would have a precise geometric interpretation. From the solid geometry perspective, it not only solves a number of calculation, proof and mapping problems in the application process, and also enriches the connotation of the Euclidean space.
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  Cataloging of Scientific Celebrity Archives Based on Metadata

  LÜRuihua;HAN Jingjing;HAN Lu

  . 2013, 31(14): 64-69. https://doi.org/10.3981/j.issn.1000-7857.2013.14.012

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  Scientific celebrity archives recorded the history of the development of the science and technology in China,which had a high historical value and academic research value. The cataloging of scientific celebrity archives was taken as the research object in this paper. Based on systematically studying the cataloging methods for domestic and abroad literatures about archives, collection, and video information, the features of MARC and metadata cataloging were analyzed, comparing with MARC, Dublin Core metadata which is easy and flexible is selected as cataloging specification. By using Dublin Core metadata and its extended metadata, basic property and special property of various information were described. The cataloging specification and standard for oral document, biography, certificate, letters, manuscripts, works, reports, peer evaluations, audio-visual information and others respectively. Description rule was discussed for every type of materials, and cataloging practice for oral and manuscript metadata were done in DSpace system.
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  Ultimate Energy Dream of Human Being： Photocatalytic Water Splitting for Hydrogen Production by Using Solar Energy

  LIN Shiwei;PAN Nengqian;ZHANG Ye;LI Jianbao;

  . 2013, 31(14): 70-75. https://doi.org/10.3981/j.issn.1000-7857.2013.14.013

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  Hydrogen production based on photocatalytic water splitting driven by sunlight is able to directly provide high-power energy from the solar energy, which is considered to be the ultimate energy dream of human being. The basic principle of photocatalytic water splitting is presented, and the thermodynamic and kinetic requirements for photocatalytic materials are outlined. Four important strategies to achieve efficient photocatalytic water splitting are discussed; these strategies include the research and development of novel photocatalysts, the construction of cocatalytic system, the modification of nanoscale morphology and structure, and the design of integrated devices. Correspondingly, the recent research progress in the key photocatalytic materials and technologies is summarized. For each strategy, the factors affecting photocatalytic performances as well as the remainder challenges are also presented. In terms of practical applications, the photocatalytic hydrogen generation system is also surveyed by introducing the sacrificial reagent employment, the artificial photosynthesis, the photolysis of seawater, and the photocatalyst stability. Finally, the development direction of photocatalytic technologies for hydrogen production based on water splitting is predicted.
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  Key Equipment and Technology for Constant Bottom Hole Pressure MPD

  ZHANG Guangyin;YANG Shunhui;ZHAO Xiangyang;DOU Ninghui;XIA Bairu

  . 2013, 31(14): 76-79. https://doi.org/10.3981/j.issn.1000-7857.2013.14.014

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  In recent years, the MPD technology sees a rapid development both at home and abroad because it can effectively reduce the downhole troubles and accidents, reduce the non-productive time, and is very suitable for the complex formation drilling operation during the oilfield development. Currently, the constant bottom hole pressure managed pressure drilling (CBHP MPD) is the most commonly used managed pressure drilling technique, covering more than 80% of the total usage. The paper analyzes first the scope of the applications, the advantages and the key technologies of CBHP MPD, and then the current solution and the technical status, including the back pressure pump and the choke control method, the continuous circulating system (CCS) control method, the continuous cycle valve (CCV), the injecting gas stable pressure and the fully automatic intelligent managed pressure drilling system. Finally, the paper puts forward some proposals for the development of the managed pressure drilling technology in the future.