Editor in chief：朱立光
International standard number：ISSN 1008-1542
Unified domestic issue：CN 13-1225/TS
Domestic postal code：
- Most Read
- Most Cited
- Most Downloaded
2018, 39(1):1-8. DOI: 10.7535/hbkd.2018yx01001
Abstract:To search a bionic prototype for fabrication of superhydrophobic surfaces, the wettability of water droplets on leaf surfaces of Hylotelephium erythrostictum is measured, and the micromorphology of these leaf surfaces is examined by scanning electron microscope and three-dimensional shape, and the characteristic parameter is extracted. Based on the Wenzel equation and Cassie-Baxter equation, theoretical models are proposed to analyze the leaf surface's hydrophobicity mechanism. Results present that the contact angles change remarkably with the variation of leaf types, the contact angle of water droplets on up side and low side of the fresh young leaf are recorded as (147.25 ± 3.79)° and (137.46 ± 4.03)°, and the greatest value is recorded as 152.54° when the water droplet contact with fresh young leaf's low side, demonstrating the fresh young leaf possesses superhydrophobic property. The leaf's surface morphology consists of convex halls and wax coverings, the ellipsoidal convex halls from young leaf show a continuous and dense arrangement with the similar height, the significant different distribution density and projected area. The wax coverings emerge as discernible platelet-formed wax crystals with an irregular pattern and overlap each other to generate numerous cavities, and the wax crystal's geometrical parameters from both sides of the young leaf exhibit extremely similar values. Both the micro-scaled convex halls and the nano-scaled wax crystals serve the function of making the leaf surface present hydrophobic property, but the wax crystals play an extremely important role. The theoretical model proposed based on the Cassie-Baxter equation can adequately elucidate the hydrophobic mechanism of leaf surface in Hylotelephium erythrostictum, and provides theoretical support for the bionic fabrication of superhydrophobic surface.
2018, 39(1):9-16. DOI: 10.7535/hbkd.2018yx01002
Abstract:Most of the existing piezoelectric traps are designed for a narrow frequency range of vibration, but the surrounding environment has a very wide frequency range, and the frequency may also be subject to change, causing the problem of difficult to achieve energy capture or capture inefficiency. In order to solve problem, a new T-type piezoelectric cantilever is proposed as a capture energy structure in the paper. To begin with the aspects of structural design and circuit design, the static analysis, modal analysis and resonance analysis of the structure are carried out and the natural frequency and excitation frequency of the device are analyzed. The design and calculation of the power consumption and the loss of the components of the circuit are analyzed by the simulation and verification of the active capture energy circuit, and the active and passive techniques are compared and analyzed, the simulation of the active capture circuit is verified by analyzing the power consumption of the circuit and the maximum power obtained by the active technology is 5 times of that of the passive technology. And then the voltage-controlled active boundary control method can be used for interface circuit design, taking the initiative to use each piezoelectric transduction cycle triggered by the electrical boundary conditions to effectively increase the input piezoelectric pump energy, and then increase output power. The way of utilizing the active trapping of piezoelectric materials is innovated, which has a positive effect on the development of piezoelectric traps.
2018, 39(1):17-23. DOI: 10.7535/hbkd.2018yx01003
Abstract:The industrialization of new energy vehicles is an important way to promote the sustainable development of automobile industry, and it is also the key measure to solve the problems of energy and environment. As an important type of new energy vehicles, electric vehicles will play an important role in the future competition in the automotive industry, especially in the field of electric vehicle driven by wheel. With the advantages of compact structure, high power density, low working noise and good heat dissipation performance, the AFPM motor has gradually become the preferred object of the hub driving device. Based on the statement of the technical development and research status about AFPM motor, this paper mainly analyzes the engineering application and technical problems of AFPM motor in hub drive, especially the matching of AFPM motor with other systems and the problem of heat dissipation at high load conditions, and looks forward to the key role in the future development of the automotive industry. This paper will play a certain reference and guiding role in the application of AFPM motor in the field of new energy vehicles.
2018, 39(1):24-34. DOI: 10.7535/hbkd.2018yx01004
Abstract:In order to study the mechanism of dissolved oxygen content on the surface corrosion behavior of Fe-based heat transfer, the first principle is used to study the adsorption of O2 monomolecular, H2O monolayer and dissolved oxygen system on Fe-based heat transfer surface. The GGA/PBE approximation is used to calculate the adsorption energy, state density and population change during the adsorption process. Calculations prove that when the dissolved oxygen is adsorbed on the Fe-based surface, the water molecule tends to adsorb at the top sites, and the oxygen molecule tends to adsorb at Griffiths. When the H2O molecule adsorbs and interacts on the Fe (001) surface, the charge distribution of the interfacial double electric layer changes to cause the Fe atoms to lose electrons, resulting in the change of the surface potential. When the O2 molecule adsorbs on the Fe (001) crystal surfaces, the electrons on the Fe (001) surface are lost and the surface potential increases. O2 molecule and the surface of the Fe atoms are prone to electron transfer, in which O atom's 2p orbit for the adsorption of O2 molecule on Fe (001) crystal surface play a major role. With the increase of the proportion of O2 molecule in the dissolved oxygen water, the absolute value of the adsorption energy increases, and the interaction of the Fe-based heat transfer surface is stronger. This study explores the influence law of different dissolved oxygen on the Fe base heat exchange surface corrosion, and the base metal corrosion mechanism for experimental study provides a theoretical reference.
2018, 39(1):35-41. DOI: 10.7535/hbkd.2018yx01005
Abstract:In order to optimize the extraction conditions, an binary aqueous two-phase system (BATPS) composed of ethanol and acetone(volume ratio is 1∶2) and ammonium sulphate is selected to extract globulin and albumin from Cerasus humilis seeds. The distribution characteristic of the globulin and albumin in this aqueous two-phase system is reflected by comparing critical data such as partition coefficient and recovery rate. The experiment shows that the optimum conditions of albumin is composed of 27.5% ethanol and acetone (volume ratio is 1∶2), and 26% ammonium sulphate, the optimum conditions of globulin is composed of 17.5% ethanol and acetone(volume ratio is 1∶2), and 24% ammonium sulphate. These results suggest that the BATPS is efficient in extracting albumin and globulin with bright application prospect, and has great potential to be used in natural protein extraction.
2018, 39(1):42-48. DOI: 10.7535/hbkd.2018yx01006
Abstract:In order to obtain high yield and purity, the synthesis method of agomelatine is studied. Agomelatine is synthesized with methyl-phenoxide and succinic anhydride by Friedel-crafts acylation, catalytic hydrogenation reduction, cyclization, Knoevenagel condensation, aromatization, NaBH4/NiCl2·6H2O reduction and acylation, and the reaction conditions and parameters are optimized and improved. The results show that the optimum conditions are as following: Catalytic hydrogenation reduction is applied instead of conventional Huang Minglong reduction or Clemenson reduction, with the amount of Pd/C is 20% in solvent anhydrous ethanol, under the pressure of 1 MPa, temperature of 35 ℃, and the yield is up to 86.8%. Knoevenagel condensation is optimized, with benzyl amine and formic acid as catalyst, n(7-methoxy-1-naphthalene ketone)∶n(cyanoacetic acid)∶n(benzyl amine)∶n(formic acid)=1∶1.8∶0.3∶0.3, and the transformation rate is 95.6%. In NaBH4/NiCl2·6H2O reduction step, Boc anhydride is specially added to protect the amino group and reduce by-product, and the yield of 72.5% is obtained. Under the optimized conditions, the total yield is 26%, and the purity is 99.79%. The structures of target compounds are confirmed by 1H-NMR and 13C-NMR. The process route of catalytic hydrogenation reduction method is green and environmentally friendly, the reaction conditions are mild, and the post-treatment is simple, which provides a theoretical reference for improving the reaction yield and purity of the product of agomelatine.
2018, 39(1):49-55. DOI: 10.7535/hbkd.2018yx01007
Abstract:In order to improve the quality control standard of Anshenbao granules, a high performance liquid chromatography (HPLC) method is developed for the determination of three active ingredients including Jujuboside A, Scopoletin and Quercetin in Anshenbao granules. The analysis is performed on a Agilent Zorbox SB C18 column(4.6 mm×150 mm，5 μm) with a gradient mobile phase of methanol-0.5% glacial acetic acid at a flow rate of 1.0 mL/min. The evaporative light scattering detector(ELSD) is used, the column temperature is 35 ℃, and the injection is 10 μL. The three active ingredients are separated completely under the given chromatogram system with a good linearity (r=0.995 6~0.998 0) of peak area and the injection. The results of precision, repeatability and stability experiments can meet the requirement, and the mean recoveries of each active ingredients are all in the range of 94.74%～96.08%. The analytical method is simple, accurate and sensitive, and it can be used for determination of active ingredients in Anshenbao granules. It is of practical significance to improve the quality standard of Anshenbao and improve the quality control of medicine.
2018, 39(1):56-64. DOI: 10.7535/hbkd.2018yx01008
Abstract:In order to explore the adsorption mechanism and optimal regeneration method of natural heulandite to high ammonia nitrogen wastewater, the natural heulandite from Hebei Province is selected as the research object. The adsorption kinetics, adsorption isotherms and adsorption thermodynamics are studied by single factor test. The results show that the adsorption process of ammonia nitrogen on heulandite with particle size range of 50~600 μm complies with the quasi-second order kinetic equation with ammonia nitrogen concentration of 500 mg/L at temperature of 25 ℃. Particle diffusion and liquid film diffusion are the dominated process of the adsorption. The adsorption capacity of heulandite is 7.81 mg/g at temperature of 45 ℃. The adsorption isotherm of ammonia nitrogen on the experimental heulandite is fitted well with Freundlich model. Gibbs free energy ΔG is calculated to be less than zero, indicating that the adsorption of ammonia nitrogen on the experimental heulandite is a spontaneous endothermic reaction. Additionally, the adsorption capacity of heulandite increases with appropriate increaseing in temperature. The optimal regeneration solvent of the saturated heulandite is 0.1 mol/L of NaCl, with which the desorption rate increases to 79%, and the times of elution and regeneration are more than 5. The results of this study can improve the economic benefits and environmental value of heulandite in the treatment of ammonia nitrogen wastewater. It can be seen that heulandite in the industrial wastewater treatment has broad prospects for application.
2018, 39(1):65-72. DOI: 10.7535/hbkd.2018yx01009
Abstract:In order to increase the transport channels of the photogenerated electrons and enhance the photosensitizer loading ability of the electrode, a new TiO2-ZnO nanorod hierarchical structure is prepared through two-step hydrothermal process. First, TiO2 nanorod array is grown on the FTO conductive glass substrate by hydrothermal proess. Then, ZnO sol is coated onto the TiO2 nanorods through dip-coating method and inverted to ZnO seed layer by sintering. Finally, the secondary ZnO nanorods are grown onto the TiO2 nanorods by the sencond hydrothermal method to form the designed TiO2-ZnO nanorod hierarchical structure. A spin-coating assisted successive ionic layer reaction method (SC-SILR) is used to deposit the CdS nanocrystals into the TiO2 nanorod array and the TiO2-ZnO nanorod hierarchical structure is used to form the CdS/TiO2 and CdS/TiO2-ZnO nanocomposite films. Different methods, such as SEM, TEM, XRD, UV-Vis and transient photocurrent, are employed to characterize and measure the morphologies, structures, light absorption and photoelectric conversion performance of all the samples, respectively. The results indicate that, compared with the pure TiO2 nanorod array, the TiO2-ZnO nanorod hierarchical structure can load more CdS photosensitizer. The light absorption properties and transient photocurrent performance of the CdS/TiO2-ZnO nanorod hierarchical structure composite film are evidently superior to that of the CdS/TiO2 nanocomposite films. The excellent photoelctrochemical performance of theTiO2-ZnO hierarchical structure reveales its application prospect in photoanode material of the solar cells.
2018, 39(1):73-83. DOI: 10.7535/hbkd.2018yx01010
Abstract:Accelerating the selenite reduction rate is important in selenite bioreduction by microorganism process. This study investigates the impact of redox mediators (α-AQS, AQS, 1,5-AQDS and AQDS) on bioreduction of selenite by Shewanella oneidensis MR-1 and optimizes the bioreduction conditions with Shewanella oneidensis MR-1 and AQDS. The selenium particles obtained from cultures are analyzed using Zeta potential analyzer. The results suggest that all four tested redox mediators are able to accelerate the reduction of selenite by Shewanella oneidensis MR-1, and AQDS is the best. The optimum conditons are AQDS concentration of 0.2 mmol/L pH of 8.0 and temperature of 30 ℃. Selenite is completely removed after 48 h bioreduction by Shewanella oneidensis MR-1 with optimum conditons. Bigger size selenium nanoparticles (SeNPS) can be obtained with AQDS. AQDS may influence the composition and content of the organic layer covering around selenium nanoparticles (SeNPs). This study could provide a foundation for particle application in selenite biodegradation.
2018, 39(1):84-90. DOI: 10.7535/hbkd.2018yx01011
Abstract:In order to evaluate the pipeline drainage capacity and urban flood risk objectively, urban storm water risk analysis modeling system (USRAMS) is developed based on EPA SWMM and ArcEngine combined with the principle of equal flow time-line method and water balance. The principle and function of USRAMS and the method of assessing pipeline drainage capacity and urban flood risk with USRAMS are described, and the suitability of USRAMS is verified. Taking Cangzhou as an example, USRAMS is used to assess the pipeline drainage capacity and urban flood risk, and the position of bottleneck pipe and the waterlogging risk distribution are expressed in thematic map accurately and directly. The facts show that USRAMS only needs two parameters, namely the runoff coefficient and the catchment time, and adapts to the current situation in china better; two-dimensional earth surface waterlogging simulation adopts hydrologic budget theory, so its calculation is stable and fast. The results of USRAMS may provide reference for urban waterlogging prevention and control and the planning and reforming of stormwater pipe network system.