bluuebunny/crossref_metadata_2025 huggingface dataset:
Effect of Xylanase-Aided Refining on Wet-End Chemistry and Bleachability of Masson Thermomechanical Pulp
Authors: Miao Qing Xian , Huang Liu Lian , Chen Li Hui
Published: September 2013

The Masson thermomechanical pulp (TMP) which was obtained from the first stage refiner was pretreated with xylanase followed by refining with PFI refiner. The impact of enzymatic refining on wet-end chemistry and bleachability of pulp were studied. The results showed that the enzymatic pretreatment could improve the wet-end chemistry properties and enhance the bleachability of masson TMP. In contrast to the control pulp sample, the beating degree, the zeta potential, the dissolved charge, the filler retention, and the sizing degree was increased respectively by 18.8%, 17.5%, 10%, 19.6%, and 18.8% at the xylanase dosage of 0.3 AXU/g (o.d. pulp); the tensile index, the tearing index and the brightness was increased by 2.3 N·m2/g, 0.19 mN·m2/g, and 1.3%ISO, respectively.
Dyeing Accelerant Octyl Hexyl Dimethyl Ammonium Bromide on Silk with Reactive Dyes
Authors: Qu Li Yuan , Zhou Jian Feng , Si Yu Kun , Zhong Ling , Zhang Feng Xiu , Zhang Guang Xian
Published: September 2013

In order to increase the fixation rate of reactive dye on silk, and decrease the dosage of accelerant, Octyl hexyl dimethyl ammonium bromide was synthesized and used as an new accelerant for reactive dyes to dye silk. The results showed that only little Octyl hexyl dimethyl ammonium bromide as accelerant, the dye up-take rates and fixation rates of reactive dyes was very high. The dosage of Octyl hexyl dimethyl ammonium bromide was 10 times less than sodium sulfate. And the color fastness of dyed silk was very high. The dyed silk with Octyl hexyl dimethyl ammonium bromide as accelerant could be cleanly washed by anion surfactant. These showed Octyl hexyl dimethyl ammonium bromide had promising application prospect.
Determination of Hemp Crystallinity by Different Evaluation Method
Authors: Zhang Jie , Zhang Jian Chun , Zhang Hua
Published: September 2013

This paper used X-ray diffraction, infrared spectroscopy and nuclear magnetic resonance (NMR) to determine the crystallinity of hemp fiber. The results show that the order of crystallinity is Segal method > Peak deconvolution method > Newman method > Infrared spectroscopy method. Both empirical formula and peak deconvolution method lead to deviation of crystallinity value. However, there is a less inaccuracy in peak deconvolution than empirical formula and could get detailed crystal parameters. Therefore, peak deconvolution method is more suitable than empirical formula for determination of crystallinity of hemp fiber.
Numerical Investigation on Performance of a Porous Medium Burner with Reciprocating Flow
Authors: Shi Jun Rui , Wu Zhi Peng , Yang Yang , Xue Zhi Jia , Zhang Xiu Li
Published: September 2013

Two-dimensional numerical investigations on the performance and structure improvement of a inert porous media burner with reciprocating flow are presented. An improved burner design is proposed and this leads to a wider high temperature profile and moderate pressure loss for extremely dilute CH4/air mixture with an equivalence ratio of 0.1.
Progress in the Research on Diffusion Filtration Combustion in Porous Medium
Authors: Yang Yang , Shi Jun Rui , Li Ben Wen , Wu Zhi Peng , Xue Zhi Jia
Published: September 2013

Diffusion filtration combustion attains widely attention as its small volume, compact structure, large power range and less emissions which is very important for saving energy in recent years. It is the combustion that fuel and oxidant are separated before burning in porous media. The researches about diffusion filtration combustion are summarized the theory, experiment and numerical simulation in this paper. There is still much knowledge unknown which should be worked on.
Numerical Simulation of Heat Transfer Characteristics in Longitudinal Flow Circular Fin Tube Based on Fluent
Authors: Yang Qian , Yi Wei Guo , Li Qun Song
Published: September 2013

Numerical simulation method were performed to comparatively study the heat transfer and resistance characteristics of smooth tubetransversal and longitudinal flow circular fin tube and longitudinal flow slotted umbrella fin tube; researched the flowheat transfer and resistance characteristics of longitudinal flow slotted umbrella fin tube with five different fin angle. Results show that, with the same piping mode and Re number, heat transfer coefficient of longitudinal flow slotted umbrella fin tube is 1.4~1.8 times of smooth tube, heat transfer coefficient of transversal and longitudinal flow circular fin tube is 1.1~1.5 times of smooth tube, longitudinal flow slotted umbrella fin tube with α=105° has the best heat transfer coefficient; the resistance of longitudinal flow slotted umbrella fin tube is 0.25~0.75 times of transversal flow circular fin tube, and higher than longitudinal flow circular fin tube, longitudinal flow slotted umbrella fin tube with α=105° has the lowest resistance of all slotted umbrella fin tubes.
The Study of Ground-Source Heat Pump in Multifunction Building in Hot Summer and Warm Winter Zone
Authors: Hu Ying Ning , Qin Wen Qi , Lin Jun
Published: September 2013

Taking one multifunction building in Guangxi as example. The paper introduces the author team who independent design and imply a ground-source heat pump (GSHP) and cooling tower hot water and air-condition joint supply system (GCHAS) which application in a multifunction building in hot summer and warm winter zone. The system performance is analyzed through the experiment. And the result of experiment proves the superiority and economy of ground-source heat pump technique in multifunction building. The author also research how to realize the energy saving and comprehensive application of ground-source heat pump work in multifunction building.
Study on Characteristic of Fluidic Attachment in Static Gas Wave Refrigerator
Authors: Liu Wei
Published: September 2013

The static gas wave refrigerator (SGWR) was a very important fluid machine in process of conveying natural gas.Its operating performance depended on characteristic of fluidic attachment and switch. This paper introduced fluidic entrainment and attachment phenomenon and analysed computational model of fluidic attachment. In order to study characteristic of fluidic attachment, the governing equation was two-dimension, unsteady and compressible N-S equation with k-ε turbulent model. The flow space was divided with two-dimention nonstructureing mesh. The results showed that the fluidic entrainment phenomenon was seized and Coanda effect was proved. The whole process of the fluidic attachment and switch were simulated and the mechanism of the fluidic switch was detailedly analysed based on the results.
Effect of Bias Flow on Flotation Efficiency in a Packed Column
Authors: Ji Jun , Ding Yi Gang , Liu Lei , Wang Li Wei , Wu Yuan Xin
Published: September 2013

Bias flow is an important parameter in a flotation process of packed column. An experiment related to P2O5 recovery of phosphate rock was designed to study the effect of bias flow on the flotation separation efficiency by a direct-reverse flotation circuit of packed flotation column. The results have showed that the recovery of P2O5 is high during the combination of the direct-reverse flotation circuit. The grade and yield of P2O5 can reach to 32.77% and 82.64% respectively, under the condition of the range of-0.005~0 cms-1 of bias flow, 0.013~0.020 cms-1 of the wash water flow rate in the direct flotation column, and the range of 0.006~0.009 cms-1 of bias flow, 0.027~0.035 cms-1 of wash water flow rate in the reverse column.
Comparison Research on Standards of Foreign Country and National Standard of China for Marine Fire Extinguisher
Authors: Qiu Jin Shui , Yi Xiang Lie , Liu Bo Yun
Published: September 2013

At present, the fire extinguishers equipped on China's warship cannot meet the requirements of the extinguishing of a ship fire, due to its special working environment. Focusing on this problem, this paper analyzes the deficiency of fire extinguisher equipped on warship currently. A comparison of U.S. military, European and Chinese standards of fire extinguisher has been done, respectively from aspects of the high and low temperature resistance, corrosion resistance, vibration resistance, shock resistance and the jet distance and the pressure resistance. The advantages and disadvantages of each standard have been analyzed. The necessity of the establishment of a marine fire extinguisher standard for our country has been probed. In the end, some suggestions have been put forward.
Flow Field and its Flowability in a Stirred Tank with a Plate Propeller
Authors: Lai Yong Bin , Sun Ya Li , Zhou Yi Jun , Li Kun , Shu Jun Feng , Wang Bo , Chen Xiu
Published: September 2013

The flow field produced by a plate propeller in a fully baffled flat bottomed cylindrical stirred tank with the diameter of 300 mm was measured using phase doppler particle analyzer. The radial distributions of the time-averaged, fluctuation velocity and turbulent kinetic energy were analyzed. The effects of off-bottom clearance and baffle on the flow field were investigated. The results showed that the fluctuation velocity and turbulent kinetic energy increased with increasing off-bottom clearance in the impeller region; meanwhile, the maximum values of the time-averaged and fluctuation velocity moved to the center of the stirred tank. The maximum axial velocity decreased with increasing off-bottom clearance in the bulk flow. The turbulent kinetic energy was higher in the impeller region. The maximum value of the turbulent kinetic energy increased with increasing off-bottom clearance and occurred near the end of the impeller. The baffle hindered the tangential velocity and exerted strong influence on the turbulent kinetic energy. The flow field in front of the baffle reflected the distribution of the turbulent kinetic energy in the impeller region.
A Novel Process for Synthesis of Cyclohexyl Ferulate
Authors: Kong Xiang Wen , Wang Han , Li Zhao Jing , Zhang Jing
Published: September 2013

Cyclohexyl ferulate was prepared by direct sterification of ferulic acid and cyclohexanol as raw materials with sodium bisulfate supported by silica as a catalyst. The influences of some factors on the synthesis process were studied. The optimal reaction conditions based upon 0. 2 mol of ferulic acid were chosen that the molar ratio of cyclohexanol and ferulic acid was 10 : 1, the mass ratio of catalyst to reactants was 5%, refluing reaction time was 3.5 hours, et a1. The yield of the product reached 80%. The structure of the product was characterized by IR, 1H NMR and MS spectrum. The catalyst could be recycled and used for many times, which is friendly to the environment.
Finite Element Analysis of Thrust Bearing in ESPCP System
Authors: Wang Lei , Gao Chong , Wang Shi Jie , Zhao Jing , Li Li
Published: September 2013

Thrust bearing is one of the most important components in ESPCP system, which determines the life of the whole system under the restriction of some factors such as the installation depth and the viscosity of swabbed petroleum oil etc. To increase the ability of high temperature resistance of thrust bearings under the limited radial size, the damage reason of applied bearings was analyzed. Some different modified methods were employed on configuration and material. Contact problems were researched with finite element analysis software. Comparison of the analysis results shows that in the tube, it is optimum that 8 rollers thrust bearings are used in 10mm radial tube without holders.
Study on the Desalination Process of Hardness-Removed Seawater with Reverse Osmosis
Authors: Cheng Jian Gao , Ma Jing Huan , Lin Zhi Wen , Liu Ying
Published: September 2013

The influences of the pressure, temperature and pH on the property of reverse osmosis membrane Dow SW30 were investigated in self-designed equipment unit with hardness-removed seawater as raw material. The optimal process parameters were pre-compression pressure 3.5 MPa, operation pressure 3 MPa, the temperature of feed seawater 25-30°C, pH value 7-8 and feed flow rate 60 L/h. Under these conditions, the flux of reverse osmosis membrane SW30 kept stable for long-term operation, and its salt rejection rate was above 99.4%.
Numerical Simulation of Micromixing with Isolate Bubbles in Microfluidic Flow-Focusing Devices
Authors: Su Liang Yao , Yang Yue , Xu Zhong Bin
Published: September 2013

Microbubbles play an important role in the micromixing of micro-fluidic systems. However, there are few results in the literature about the mixing of the liquids caused by bubbles flow. The paper presents the numerical simulation of bubbles flow in microfluidic, which agrees well with the experimental results. The influence of velocity amplitude, frequency and phase difference on the mixing performance was investigated. The results show that the isolate bubbles as obstruction can improve mixing efficiency in the true straight microchannel, the bigger the velocity amplitude, and the higher the frequency, the better the mixing efficiency is, but the mixing efficiency has nothing to do with the number of bubbles and just benefit from the certain phase difference. With the other two parameter remains unchanged, the mixing performance achieves the best value when the velocity amplitude is 0.25m/s, the frequency is 25HZ, the phase difference is 0.25, respectively. The study referring to bubbles flow induced mixing performance is very important for many microfluidic devices.
Predominance Diagrams of Dissolved Uranium Species and logfO2(g)-pH Diagrams of U-PO43--Nacl-H2O System at 25°C, PCO2=10-3.5 Mpa
Authors: Wang Xin Yu , Ni Shi Jun , Shi Ze Ming
Published: September 2013

To explore the effect of logfO2(g), pH, uranium concentration, phosphate concentration and NaCl concentration on the predominance diagrams of dissolved uranium species and formation of solid phases containing uranium in the U-PO43--NaCl-H2O system at 25 °CandPCO2=10-3.5MPa, the thermodynamic model of this system was constructed. Based on the results of calculation, the logfO2(g)-pH diagrams were drawn. It can be found that: 1) the formation of uraninite needed enough reductive condition (about logfO2(g) < -50 ), while the formation of Na-Autunite needed the strict pH range (5<pH<8) in oxidative condition. 2)The addition of phosphate concentration could promote the formation of Na-Autunite, and inhibit the formation of U4O9(C). 3)The independent increasing of uranium concentration can lead to more kinds of uranium species.4) The variance of NaCl concentration had little impact on the formation of solid phases containing uranium.
Dependent Component Analysis and its Applications for Estimation of Source Ultraviolet Spectral Profiles and Characterization of Processing Batch for Preparation of Radix scutellariae
Authors: Dong Chun Hong , Li Jun , Liu Ying Fan , Zhao Shao Wei , Wang Guo Qing
Published: September 2013

Dependent component analysis (DCA), which is an extension of independent component analysis (ICA) for blind source separation (BSS) and requires no assumption on the distributions of the sources, was used to directly estimate source spectral profiles from ultraviolet spectra (UV) of mixtures. By simply assuming that the sources are dependent only through their variances and have temporal correlations, variance DCA was established. The efficiency of DCA for estimation of source UV spectral profiles was qualified by synthetic mixed UV data. It was shown that the estimation efficiency of DCA is better than that of FastICA when the sources are seriously overlapped. Then the DCA was used to directly estimate source spectral profiles from UV data that were measured at different steaming periods during the processing procedure batch for preparation of radix scutellariae. The estimated dependent components (DCs) and their variations of relative concentrations were used to characterize the processing batch. The results show that the estimated DCs are corresponding to sterol and flavonoid compounds, respectively. By inspection of the change trends of the estimated DCs, the endpoint of the processing batch was determined as 55 min, which is more accurate than that it should be located in 30~60 min by traditional sensory analysis. DCA provides an alternative approach for estimation of source spectral profiles from the overlapped spectral signals, and UV-DCA can be used as a novel way for characterization of the traditional Chinese medicines processing procedure.
Research on the Catalytic Activity of MnyCezOx/TiO2 for Ethyl Acetate Oxidation
Authors: Li Xin , Su Wei , Xia Qi Bin , Liu Zhi Meng
Published: September 2013

Manganese and cerium based catalysts with different Mn/Ce molar ratios prepared by impregnation method for ethyl acetate oxidation. The activity tests of the samples were performed in a fixed-bed reactor. The effect of gas hourly space velocity (GHSV) and ethyl acetate concentration on the catalytic activity of the catalyst were also investigated. The results showed that these catalysts had high activity for the catalytic oxidation of ethyl acetate, of which the catalyst Mn0.9Ce0.1Ox/TiO2exhibitedthe bestactivity, and the temperature required for 90% conversion of ethyl acetate was at 216 °C. The catalyst Mn0.9Ce0.1Ox/TiO2still maintained high activity in the range of GHSV (16,500 to 48,500 h-1) and ethyl acetate concentration (4526 to 7092 mg/m3). In additional, experiments for measuring stability of Mn0.9Ce0.1Ox/TiO2were carried out, and experimental results showed that the good stability of Mn0.9Ce0.1Ox/TiO2was kept after it has run for 25 hours.
Preparation of Titanium Carbide Coatings from Chloride-Fluoride Melts by Pulse Electroplating
Authors: Lv Wang Yan , Su Wei , Liu Shi Nian , Zeng Chao Liu
Published: September 2013

Titanium Carbide (TiC) is a hard ceramic material with excellent tribological wear properties and high chemical stability at room temperature. To develop wear and corrosion resistant TiC coatings, electrodeposition of TiC coatings on the type 304 stainless steel (304SS) in molten NaCl-KCl-NaF-K2TiF6at 900°C was investigated. Pulse plating technique in a form of periodically interrupted potential was applied using graphite (anode) as the source of carbon. It was found that a continuous TiC coating with a thickness less than 1 μm could be obtained on 304SS by periodically applying a potential of-2.8 V for 1h. Though this TiC coating delaminated, its inner layer exhibited excellent adhesion to the substrate. This method can be used to prepare compact TiC coatings.
Electrocatalytic Oxidation of Sulfadiazine on a NiO/MWCNT Film Modified Glassy Carbon Electrode
Authors: Hong Xiao Ping , Ma Jing Ying
Published: September 2013

This work describes the preparation of multi-walled carbon nanotubes (MWCNT) and nickel oxide particles (NiO) composite modified electrode. The electrochemical catalytic performance of the new modified electrode toward sulfadiazine was studied by voltammetric method. The modified electrode exhibited good catalytic performance for the electrochemical oxidation of sulfadiazine at potential of 0.9 V, which was 0.2 V lower than that obtained by a normal glassy carbon electrode. The results of amperometric study suggested that the anodic current of the modified electrode linearly increased against the concentration of sulfadiazine in the range 1.0 - 7.9 μM.
Degradation of Crystal Violet by Pulsed Corona and Spark Discharge: Determination of Removal Mechanism
Authors: Zhang Li , Liu Li Bo , Sun Bing
Published: September 2013

The pulsed discharge includes corona discharge and spark discharge. The voltage waveforms, photo, the decoloration rate of Crystal violet in corona discharge and spark discharge were investigated respectively. The results show that the spark discharge is more intense than the corona discharge. The decoloration rate of Crystal violet by spark discharge is 90%, which is higher than that corona discharge. From the UV-Visible and FTIR spectra, we can see that the molecular conjugated system and the benzene ring of CV were damaged by pulsed discharge.
Effect of Tartaric Acid on the Electrochemical Behavior of K3[Fe(CN)6] on the Electrodes Coated with Cyclodextrin Modified Multi-Walled Carbon Nanotubes
Authors: Wang Hai Tao , Kang Shi Zhao , Yang Qiu Ling , Mu Jin
Published: September 2013

The effect of tartaric acid on the electrochemical behavior of K3[Fe(CN)6] was investigated on bare ITO electrodes, electrodes coated with multi-walled carbon nanotubes possessing carboxyl groups (MWNT-COOHs), and electrodes coated with cyclodextrin modified multi-walled carbon nanotubes (MWNT-CDs), respectively. It is found that the molecular chirality of tartaric acid can hardly influence the electrochemical behavior of K3[Fe(CN)6] on bare ITO electrodes. When the electrodes coated with MWNT-COOHs are used, the effect of the molecular chirality becomes distinguish. In the case of the electrodes coated with MWNT-CDs, the enhanced chiral discrimination between D-tartaric acid (D-TA) and L-tartaric acid (L-TA) can be observed. The control step in the electrochemical reaction of K3[Fe(CN)6] on the electrodes coated with MWNT-CDs is deduced to be different when D-TA or L-TA is introduced into the solution, respectively. Therefore, the enhanced chiral discrimination on the electrodes coated with MWNT-CDs is probably due to the change of the control step in the electrochemical reaction of K3[Fe(CN)6] caused by the chiral recognition of cyclodextrin moieties to D-TA and L-TA.
Enhanced Resonance Light Scattering from CdS Quantum Dot-CTMAB for the Determination of Estradiol Valerate
Authors: Xie Liang Xiao , Chao Ying Jun , Du Kang , Yang Yong Qiang , Cao Wei
Published: September 2013

A method is developed to detect estradiol valerate which is based on the phenomenon that estradiol valerate can enhance the resonance light scattering intensity of CdS QD. Cetyl Trimethyl Ammonium Bromide (CTMAB) is added to sensitize this system. Under optimum conditions, the enhanced intensity of the system is in proportion to the concentration of estradiol valerate in the range of 5.0×10-8 ~ 6.0×10-7 gmL-1. The detection limit is 1.2×10-8 gmL-1. It has advantages that simple, sensitivity and stable.
Impedence Characterization of the Donor Materials Effect on Photoelectrocatalytic Hydrogen Production by Water Splitting Using TiO2 Nanotube Arrays Photoanode
Authors: Liang Ke Xin , Du Zu Kun , Tan Yu , Zhang Sheng Han
Published: September 2013

Anatase TiO2nanotube arrays with about 50nm pore diameter were prepared by anodic oxidation. The effect of the donor materials (sodium hydroxide, methanol and ethylene glycol) on electrochemistry impedance spectroscopy (EIS) and the photocurrent responses of TiO2nanotube arrays photoanode in the photoelectrochemical cell for splitting water hydrogen production were investigated. The results indicate that all the donor materials enhance the photocurrent responses and reduce the internal reaction resistances of the TiO2nanotube arrays photoanode. The effect of adding organic donor compounds in the anolyte on charge transfer and photocurrent is superior to the inorganic donor compounds and in turn reduces from the ethylene glycol, methanol to sodium hydroxide. Additionally, it should be highlighted that +0.3V vs. open circuit potential of applied potential on the electrode promotes a suitable charge transfer at semiconductor/electrolyte interface. The flat band potentials of TiO2nanotube arrays photoanode move to negative direction with donor materials adding in the anolyte which indicates beneficial photoelectrocatalytic hydrogen production by water splitting.
Comparison of Au, Ag Electrode in Carbon Dioxide Electrochemical Reduction under the same Condition
Authors: Wang Xiao Chun , Jia You Jian , Shi Feng , Shi Jin
Published: September 2013

The electrochemical reduction of carbon dioxide (CO2) has been studied on various metal electrodes including main group and transition elements in aqueous solution. Of these electrodes, silver and gold are found to have catalytic activity for the conversion of CO2 to CO with considerably high Faradaic efficiencies. However, no work has been done to evaluate the electrocatalytical property of these two electrodes in the same electrochemical system under the same condition. In present work, we investicate the electrocatalytical property of Ag and Au electrodes in the same electrolysis cell and under the same condition. We found Au electrode exhibits higher current density and higher faradaic efficiency for CO formation than Ag electrode.
Research on Direct Effects of High-Voltage Electrostatic Field on Lactoperoxidase's Activity
Authors: Ma Xing Ke , Du Zheng Wei , Zhu Min , Mu Bo Jia
Published: September 2013

At present, indirect effects of high-voltage electrostatic field on organisms and biological materials have been extensively studied. However, the investigations on direct interaction between the electrostatic field and enzyme are scarce. In this paper, the direct effect of high-voltage electrostatic field on the LP and the protective effects of sucrose fatty acid ester on the activity of enzyme in high-voltage electrostatic field have been experimentally investigated. The results show that, high-voltage electrostatic field has direct effects on the LP and the best condition to enhance the activity of enzyme can be obtained. When the electric-field strength is low, with the increasing of the electric-field strength, the activity of the LP will be weakened. When the electric-field strength exceeds a certain level, the activity of the LP will be enhanced with the increasing of electric-field strength. For too higher electric-field strength , the activity of the LP will be again weakened with the increasing of electric-field strength. The sucrose fatty acid ester in low concentration provides a proper hydrophobic microenvironment for enzyme, which leads to the enhancement of enzyme's activity, while sucrose fatty acid ester in high concentration leads to the weakening of enzyme's activity. Moreover, sucrose fatty acid ester in enzyme solutions has protective effects on enzyme in the electric field and can reduce the impacts of high-voltage electrostatic field on the LP.
An Activity Coefficient Model Based on the Hydration for Electrolyte Solutions
Authors: Wu Lian Ying , Xu Xian Zhen , Hu Yang Dong
Published: September 2013

This paper proposes a hypothesis of hydration. It assumes that the solute in the electrolyte solution exists as molecules, and each solute molecule is surrounded by h water molecules. On this basis, this paper deduces the activity coefficient formulas, and the model is applied to binary electrolyte solutions at room and elevated temperatures.
Chiral Liquid Crystalline Polymers Containing Isosorbide Groups
Authors: Tian Mei , Xu Zhi Xin , Gao Li , Yao Dan Shu , He Xiao Zhi , Meng Fan Bao
Published: September 2013

A series of new main-chain liquid-crystal polymers (LCPs) were prepared from sebacoyl chloride (SD) and various amount of 4, 4-Dihydroxy-2, 2-dimethyl Benzalazine (DDBA) and isosorbide (ISO). The liquid crystal (LC) properties were investigated by polarized optical microscope (POM), differential scanning calorimetry (DSC) and X-ray diffraction measurements. P1 exhibited a typical nematic thread texture, which contains no ISO. P2-P7 are Sc* and N LCPs, which exhibited broken fan-shaped texture and droplet texture. The introduction of chiral units into the polymers led to a change of mesomorphase, as compared with P1.
The New Synthesis of 4,7-dithienyl[ 2,1,3]-benzoselenadiazole
Authors: Sun Xiao Xia , Lei Xiao Long , Qi Chun Hua , Hu Yu
Published: September 2013

Heterocyclic monomers based on benzo [[1,2,thiadizole bearing solubilizing side chains have been synthesized in high yields over four steps from readily available starting materials. A multistep synthesis of the electron-poor 4,7-di (thiophen-2-yl) benzo [[1,2,selenadizole are presented. The new dificient acceptor has good solubility in organic aolvents to permit an appropriate coating process.
Study on Preparation and Properties for Epoxy Shape Memory Polymer
Authors: Cheng Yuan , Zhao Ben Bo , Yuan Xiao Yan
Published: September 2013

A thermosetting epoxy shape memory polymer was obtained by adding modifier end thioglycolic acid butyl glycol ester which prepared in our lab into E-44/D-230. The results show that the tensile and impact strength of modified epoxy are improved, and it can be bended as U style in thermal transition temperature, shape fixed rate is 100% after removing external force. When temperature is raised to thermal transition temperature again, the shape of modified epoxy can be restored completely. The time of recovery is between 178~183s and not effected by cycle times.
A Method of Detecting Carton Black in Rubber Based on Optimized Rubber Image
Authors: Wang Xiao Bo , Wang Chuan Sheng
Published: September 2013

Detecting carton black is the basis of evaluating carton black’s dispersion, which is important for researching mixing process. Considering the difference of gray between rubber and carton black, K-Means algorithm was adopted to recognize carton black. With the consideration of some deviations where using K-Means algorithm to recognize carton black with small size, rubber image was optimized on the basis of inflection point. Application of optimizing rubber image and K-Means algorithm improves the accuracy of detecting carton black, which supplies support for evaluating carton black’s dispersion precisely.
Structural Characterization of Serial Novel Star-Shaped Biodegradable Material Poly(lactic acid-co-melamine)
Authors: Mo Guang Zhen , Xiong Jin Feng , Peng Pai , Wang Zhao Yang
Published: September 2013

Using flame retardant melamine (MA) as a new aromatic core, biodegradable material poly (lactic acid-co-melamine) [P(LA-co-MA)] with different molar feed ratios are synthesized via direct melt copolycondensation. The structures of P(LA-co-MA) s are characterized by FT-IR,1H-NMR,13C-NMR and GPC. The results indicate that MA moiety as the core is incorporated into the PLA backbone as expected, and the obtained products are copolymers indeed.
Synthesis of a Biodegradable Material Poly(lactic acid-co-melamine) via Direct Melt Polycondensation
Authors: Feng Min Hua , Xiong Jin Feng , Wang Qun Fang , Wang Zhao Yang
Published: September 2013

Directly starting fromD,L-lactic acid (LA) and melamine (MA), novel star-shaped biodegradable material poly (lactic acid-co-melamine) [P(LA-co-MA)] as a kind of potential flame retardant is synthesized via melt polycondensation. When the molar feed ration(LA)/n(MA) is 60/1, the optimal synthetic conditions are discussed. After the prepolymerization at 140 °C for 8 h, using 0.4wt% stannous chloride as the catalyst, the melt copolymerization at 160 °C for 8 h gives the copolymer with the biggest intrinsic viscosity 0.87 dLg-1.
Study on Luminescence Properties of Bipolar Copolymers Containing Quinoline Aluminum and Carbazole Groups
Authors: Shen Teng Fei , Sun Ying Juan
Published: September 2013

In this work, a series of novel bipolar copolymers containing 8-hydroxyquinoline aluminum (Alq3) and carbazole had been synthesized by copolymerization of Alq3 complex monomer and N-vinylcarbazole (NVK), and the luminescence properties of the copolymers were investigated by UV-vis and fluorescence spectra. The results showed that energy can transfer effectively from carbazole group to Alq3. Furthermore, energy transfer process and luminescence mechanism of the bipolar copolymers were discussed.
Spectrophotometric Study on the Determination of Palladium with 4 -(5-Bromo-2-Pyridyl)-Azo-1,3-Diaminobenzene
Authors: Qu Wei , Zhou Cheng Ying
Published: September 2013

This document develops a new spectrophotometric method for the determination of palladium with 4-(5-bromo-2-pyridyl)-azo-1,3-diaminobenzene, in a medium of 1.80mol/L sulfuric acid, at the maximum wavelength of 566nm. Absorption spectra of reagent and complex, effect of acidity, composition of complex and heating time for color reaction are discussed. More than 30 kinds of interfering ions are determined. The interference of Pb2+, Ag+and Cr6+are eliminated effectively by the proposed method. Beers law is obeyed in the concentration ranges of 0-1.0mg/L for palladium, the molar absorption coefficient is 6.44×104Lmol-1cm-1. The method is applied to the determination of palladium in general ores and palladium catalysts.
Supramolecular Structure in the Cocrystal of 3, 5-Bispyridyl-1-H-1, 2, 4-Triazole and 4,4-Oxybis(Benzoic Acid)
Authors: Li Ting , Li Bing , Chen Xiao Yan , Wang Jun Mei , Sun Lin , Shen Dan , Zhong Bo , Ren Jian Lin , Hu Qi Lin
Published: September 2013

A new cocrystal (3,4-Hbpt)-(H2oba) (3,4-Hbpt =3-(3-pyridyl)-5-(4-pyridyl)- 1-H-1,2,4-triazole and H2oba=4,4-oxybis (benzoic acid)), was prepared via self-assembly in the presence of cobalt acetate as template by hydrothermal reactions. The title complex was characterized by single-crystal X-ray diffraction, elemental analysis and IR spectroscopy. Structural analysis reveals that the complex belongs to monoclinic system, space group P21/c. The two carboxylate groups from H2oba are not deprotonated and form two kinds of strong intermolecular hydrogen bonds with 3,4-Hbpt, which linking the molecules into one-dimensional chains. Furthermore, the one-dimensional chains are connected by the hydrogen bond interaction to form two-dimensional lamellar structures. Intermolecular hydrogen bonds may be effective in the stabilization of the crystal structure.
Degradation of Sarin Simulant DFP by Dielectric Barrier Discharge Plasma
Authors: Zhao Hong Jie , Hu Zhen , Li Zhan Guo
Published: September 2013

The Dielectric Barrier Discharge plasma (DBD) plasma was used to treat Diisopropyl fluorophosphate (DFP, a stimulant of sarin) in the air. The influence factors of degradation efficiency, including power, carrier gas flow velocity and initial concentration of DFP were investigated. As a result, the degradation efficiency increased with the power increasing. The degradation efficiency increased fastly when the power less than 105W, but slowly when the power more than 105W. The degradation efficiency decreased obviously with the carrier gas flow velocity increasing, because the time of DFP stayed in plasma reactor decreased and the concentration of DFP increased. The degradation efficiency rose firstly and then fell with the initial DFP increasing, when the initial concentration was less than 80 mg/m3, but decreased with the the initial concentration increasing, when the initial concentration was more than 80 mg/m3. The main products were acetone, isopropanol, phosphoric acid, pyrophosphoric acid, carbon dioxide and water, analyzed by GC-MS. Reaction mechanism was discussed according to degradation products.
Hydrothermal Synthesis and Crystal Structure of a Cobalt Complex
Authors: Gao Liang Jun , Song Wen Dong
Published: September 2013

A new coordination polymer based on cobalt nitrate and 2-4-pyridyl-1H-benzimidazole- 5,6-dicarboxylate (H2pbd), namely [Co (pbd)2·(H2O)2]n·n (H2O)2, have been synthesized under hydrothermal conditions and characterized by elemental analysis, IR spectroscopy and single crystal X-ray diffraction. The crystal of the complex crystallizes in triclinic, space group P-1 with a=7.6708(6)Å, b=8.0009(8)Å, c=12.8348(12)Å, α=96.4040(10) o, β=102.9480(10) o, γ=112.142(2) o, V=694.11(11)Å3, Z=1, C28H22CoN6O12 and F(000)=376.0. The H2pbd ligand links the Co (II) atoms into a double stranded chain.
Preparation and Non-Isothermal Kinetics Analysis of N-[(4-Bromo-3,5-Difluorine)Phenyl]acrylamide
Authors: Yao Xin Ding , Fang Rui Na , Pang Hong Jian , Wang Zong Wu , Liu Guo Ji
Published: September 2013

N-[(4-bromo-3,5-difluorine) phenyacrylamide was synthesized first time by the interaction of 4-Bromo-3,5-difluoroaniline with acryloyl chloride in presence of triethylamine. The compound behavior was investigated using TG and DSC techniques under non-isothermal linear regime. The non-isothermal kinetic data were analyzed with the Achar equation, Coats-Redfern equation,Kissinger equation, Flynn-Wall-Ozawa equation and Starink equation. The mechanism function and kinetic parameters of the thermal decomposition were obtained. The chemical reaction mechanism (F3) controlled the decomposition process. The apparent activation energy and the pre-exponential factor wereE=240.01 KJmol-1andA=2.341023s-1respectively.
Effect of Plant Polyphenol Genistein on Growth of Human Ovarian Carcinoma Transplanted Subcutaneously in Nude Mice
Authors: Liu Bin , Sun Jie Yun , Yu Li
Published: September 2013

In this study we investigated the effect of plant polyphenol PTK inhibitor genistein on subcutaneous human transplant ovarian cancer tumor of nude mice. All 30 cases of nude mice are used to establish subcutaneous xenograft models of human ovarian cancer, and divided into 4 groups: Control group (containing 0.04% DMSO of saline); Genistein group (containing 0.2 mg / kg and 0.4 mg/kg two concentrations, subcutaneous injection); Cisplatin group (4 mg/kg, i.v.); Genistein and Cisplatin combination group. The transplanted tumor growth and weight changes of nude mice in different groups on 7, 14, 21 and 28 days were observed and histopathological examined. The results showed that the growth of SKOV3 xenograft tumor was significantly inhibited in 0.4 mg/kg Genistein group. Compared with control group, the tumor weights were decreased, the tumor volumes were reduced, and there was a significant increase in the area of necrosis, but no significant effects were showed on the weights of nude mice. 0.4 mg/kg Genistein (s.c.) in combination with 4 mg/kg Cisplatin (i.v.) enhanced the inhibitory effect. The results provide evidence for the potential usefulness of Genistein in the prevention and treatment of human ovarian carcinoma.
Lobular Pheasant Tail Leaf Volatile Extraction and Chemical Components of the Essential Oil Analysis
Authors: Wang En Hua , Sang Qiu Zhang , Yang Xiao Hong
Published: September 2013

Objective: To study the lobular pheasant tail leaf volatile chemical composition. Methods: the extraction of volatile chemical composition lobular pheasant tail blades of steam distillation, gas chromatography - mass spectrometry method for the separation and identification of its composition and relative content. Results and conclusion: 41 chemical compounds were identified. The main chemical constituents of volatile oil seeTable 1.
Study on Extracting Technology of Vc from Momordica charantia
Authors: Jiang Chen Guang , Tang Qing Jie
Published: September 2013

Balsam pear was used as the research object in experiment, the technological parameters were studied such as the way of crushing, leaching agent type and its concentration, solid-liquid ratio, ultrasonic extraction temperature, time, power's influence on the extraction yield of Vc, and the ultrasonic extraction time, temperature, ultrasonic power on the L9 (34) orthogonal test analysis. Results showed that bitter melon slices, and solid-liquid ratio is 1:7, citric acid as leaching agent and the concentration of 1%, ultrasonic power is 80 w, leaching temperature 30 °C, 40 min leaching time, leaching of balsam pear Vc the highest rate.
Isolation and Purification of Orientin and Isovitexin from Thlaspi arvense Linn
Authors: Pang Sai , Ge Yan , Wang Li Sheng , Liu Xu , Lin Cui Wu , Yang Hua
Published: September 2013

The crude extract obtained by water extraction and alcohol precipitation from Thlaspi arvense Linn was separated respectively by different solvents such as petroleum ether, ethyl acetate and butanol. Ethyl acetate fraction was separated by semi-preparative HPLC to give compound 1, and butanol fraction was continuously separated by D101 macroporous resin and semi-preparative HPLC to give compound 2, the chemical structures of two compounds were elucidated by 13C-NMR1H-NMRMsUV and named as Orientin and Isovitexin (their purity > 98% using normalization method of HPLC).
Analysis of the Volatile Chemical Constituents of Agrimonla pilosa Ledeb with Gas Chromatography-Mass Spectrometry and Heuristic Evolving Latent Projections
Authors: Xu Li Li , He Yun Biao , Feng Xiao Liang , Huang Lan Fang , Wang Yu Lin
Published: September 2013

Analysis of the volatile components in Agrimonia pilosa Ledeb with heuristic evolving latent projections (HELP) was presented. After extracted with water distillation method, the volatile components were detected by GCMS. Then the qualitative and quantitative analysis of the volatile components was completed with HELP resolving two-dimensional original data into mass spectra and chromatograms. 62 of 83 separated constituents in the total ion chromatogram of the volatile components were identified and quantified, accounting for about 86.49% of the total content. The obtained information can provide foundation for further study of Agrimonia pilosa Ledeb. This developed method can also be used for quality control of Agrimonia pilosa Ledeb samples.
The Study of the Kinetic Model of Halomonas Salina Fermenting Ectoine
Authors: Gao Shuang , Zhang Ling Hua , Chen Qing , Bai Lin , Lang Ya Jun
Published: September 2013

Ectoine had important physiological functions and superior potential applications, so the study of ectoine was extensively attented. This article was related to kinetic models of cell growth, product formation and substrate consumption, which was not only established according to the characteristics of ectoine batch fermentation by Halomonas salina DSM 5928 but also obtained the kinetic parameters by the nonlinear fitting method in the Microcal Origin software. Logistic, Luedeking-Piret and Luedeking-Piret-like equations was applied to analyze the cell growth, the ectoine formation and the substrate consumption by the kinetic model，respectively. The results between calculated values and experimental data were coincident. By fitting, correlation coefficients R2 were ≥ 0.989. The fermentation conditions of ectoine were analyzed according to the model. The results showed that ectoine productivity (0.28 g/L/h) was the highest when initial monosodium glutamate concentration (S0) was 60 g/L. However, when S0 was 80 g/L, the ectoine concentration was maximal, i.e., 7.59 g/L. The research suggested that ectoine formation belonged to the mixed kinetic mechanism of cell growth and biomass concentration, while the ectoine production mainly depended on instantaneous biomass concentration. The fermentation method for improving ectoine concentration was further proved. The established kinetic model will be of significant value to provide the optimal conditions of present process.
Protective Effects of Gynostemma pentaphyllum Makino Polysaccharide on Alcoholic Hepatic Injuries
Authors: Song Shu Liang , Xiao Zeng Ping , Liang Hao , Wang Yun Shan , Ji Ai Guo
Published: September 2013

Crude Gynostemma pentaphyllum Makino polysaccharide was extracted by water extraction and ethanol precipitation. After purification by depectinization and decolourisation, polysaccharide GPS-3 was obtained by purification using Q Sepharose Fast Flow and Superdex 200 columns. Furthermore, the protective effects of GPS-3 on alcoholic hepatic injuries of mice were studied. Results showd that GPS-3 had significant protective effects on alcoholic hepatic injuries.
Extraction, Purification and Cytotoxic Activity of Cerebrosides from Asterina pectinifera
Authors: Zuo Hai Jiao , Wang Tian , Qi Yan Xia , Zhao Qian Cheng , Li Zhi Bo
Published: September 2013

Cerebrosides were extracted from Asterina pectinifera using ethanol extraction and silica gel column chromatography. The identification of the cerebrosides was established based on thin layer chromatography (TLC), UV, IR and HRMS. The cerebrosides exhibited moderate cytotoxic activities against Hela and BEL7402 cell lines. At the concentration range of 10-400μg/ml, cytotoxicity of cerebrosides on two human tumor cells showed a dose-and time-dependent manner.
Ultrasound-Microwave Assisted Extraction and Separation of Ricinus communis Allergen from Castor Bean Meal
Authors: Zhang Ai Lin , Wang Chang Lu , Hu Yu Feng , Zhou Zhi Jiang
Published: September 2013

The influence of ultrasound-microwave during extraction of Ricinus communis(L）allergen from castor bean meal (CBM) was investigated. The method was successfully applied for the ultrasound- microwave assisted extraction (UME) of allergen from CBM. The corresponding extraction parameters including the extraction temperature, ultrasonic-microwave power and extraction time were investigated. The CBM was crushed, sifted, ground and suspended for 4 h in 25% ethanol water (1:4) at room temperature followed by ultrasound-microwave. The yield, polysaccharose and protein contents were determined after each processing step. The purity of extracted allergen was tested through HPLC and the Sephadex G-100 and Tricine-SDS-PAGE detection with unique electrophoresis strip documented that allergen was purifed.. The paper describes the conditions of the temperature,time,and microwave-power for the method reliability with UME and suitablilty for the effective extraction of allergen from CBM.
Effects of Natural Compound Genistein on the Proliferation and Apoptosis in Ovarian Carcinoma Cell Lines 3AO
Authors: Lin Xiao , Yu Li
Published: September 2013

In this study, we aimed to investigate the effects and mechanism of Genistein on proliferation inhibition and onset of apoptosis in ovarian carcinoma cell line 3AO. Antiproliferative effect of Genistein against 3AO was tested by MTT method. Apoptotic phenotype of 3AO was observed by electron microscope. Cell apoptosis percentage and cell cycle phase distribution of 3AO were measured by flow cytometric assay. The expression of proliferation and apoptosis associated protein was determined by using immunocytochemical method. A time-dependent and dose-dependent proliferation inhibition was demonstrated in 3AO, and Genistein induced a G2/M cell cycle arrest . The characteristic morphological changes of apoptosis in 3AO cells were observed after treated by Genistein. 20μmol/L Genistein could down-regulate the expression of PCNA, CyclinB1 and Bcl-2; and up-regulate the expression of P21WAF1/CIP1 and Bax. The time-dependent and dose-dependent proliferation inhibitory effect of genistein on ovarian cancer appears to be due to the up-regulation of P21WAF1/CIP1 and PCNA expression, down-regulation of CyclinB1 expression, and the apoptosis is related to the up-regulation apoptotic proteins Bax and down-regulation of anti-apoptotic proteins Bcl-2. The results provide evidence for the potential usefulness of Genistein in the prevention and treatment of human ovarian carcinoma.
Study on Ultrasonic Wave Extraction of Flavonoids from Bamboo Leaves
Authors: Jiang Shao Juan
Published: September 2013

Extracting flavone from bamboo leaves by ultrasonic, the flavonoid extraction conditions was optimized by single factor experiment and orthogonal experiment design, and the traditional heat reflux method was compared. The results showed that: the optimum process conditions of ultrasonic wave extraction of flavonoids from bamboo leaves were ethanol concentration of 70%, solid to liquid ratio of 1:20, extracting 20 min in 60 °C. Under this condition, extraction content of total flavonoids was up to 4.538 mg.g-1. And ultrasonic assisted extraction was superior to hot reflux extraction.
Isolation and Purification of Ginkgo Flavonoids by High-Speed Counter-Current Chromatography
Authors: Lu Sang Sang , Song Hui , Miao Jing Zhi , Tang Shi Rong
Published: September 2013

High-speed counter-current chromatography (HSCCC) was successfully used for isolation and purification of Ginkgo flavonoids from the Ginkgo biloba L. leaf extract (GBE) with a two-phase solvent system composed of n-hexaneethyl acetatemethanolwater at an optimized volume ratio of 4:6:5:5(v/v/v/v). The lower phase was used as the mobile phase in the head to tail elution mode. The preparative HSCCC separation was performed on 200 mg of GBE yielding pure Quercetin (22mg), Kaempferol (15mg) and Isorhamnetin (4mg) at purities of 96.6%, 92.3% and 93.6%, respectively, as determined by high performance liquid chromatography (HPLC). HSCCC is a powerful technique for isolation and separation of chemical composition from GBE.