• Volume 38,Issue 5,2017 Table of Contents
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    • >Special Column: National Young Scholar/Local Science Foundation
    • Wettability measurement and hydrophobicity mechanism analysis of body surface in locust Locusta migratoria manilensis

      2017, 38(5):411-417. DOI: 10.7535/hbkd.2017yx05001

      Abstract (1734) HTML (0) PDF 1.96 M (3040) Comment (0) Favorites

      Abstract:To search a bionic prototype for simple fabrication of superhydrophobic surface, the wettability of water droplets on typical parts of body surface in locust Locusta migratoria manilensis is measured, and micromorphology of these typical parts are detailedly examined with a scanning electron microscope and a scanning white light interferometer. Based on Wenzel model and Cassie-Baxter model, the hydrophobic mechanism of these typical parts is analyzed briefly. Results present that the contact angles of water droplets on these typical parts change obviously, as exhibiting the greatest value of (132.92 ± 4.73)° on internal wings and the smallest value of (119.47 ± 4.32)° on external wings, whereas the neck surface and the mouthpart surface presenting rather similar contact angle values. SEM and SWLI observations show that the surface of external wings distributes ~100 μm scaled ridge-like convexes and nano scaled wax coverings, and the surface of internal wings consists of milli-micro scaled ridge-like convexes and numerous micro-nano scaled mastoids. Both the neck surface and mouthpart surface show undulate structures with milli-micro ranged parameters, whereas present rather smooth micromorphology when examining a rather small area. The surface of internal wings possesses the dual structures consisting of ridge-like convexes and numerous mastoids, thus it makes water droplet to generate the Cassie-Baxter contact state and consequently exhibit great contact angles. Other typical parts of the locust's body surface possess the microstructures to make water droplet to generate the Wenzel contact state and thereby exhibit relatively smaller contact angles. The obtained conclusion can quantitatively describe the wettability of typical parts in locust body surface, as well as provides a theoretical foundation for developing bioinspired materials with hydrophobic properties and self-cleaning abilities.

    • Stiffness parameters analysis of tubular segmented damping structure

      2017, 38(5):418-423. DOI: 10.7535/hbkd.2017yx05002

      Abstract (1746) HTML (0) PDF 801.45 K (2474) Comment (0) Favorites

      Abstract:Segmented damping treatment could be used for tubular structure because of its short service life and frequent replacement. In order to achieve the ideal damping effect, it is necessary to improve the loss factor of the structure. The stiffness parameters will directly affect the loss factor of damping structure. The mathematical model of the stiffness parameters is established. Considering the material parameters and geometric dimensions of the structure cross-section, the calculation and analysis about the stiffness parameters are carried out. The results show that when the other parameters keep the same, stiffness parameter increases with the increase of interval number and the constrained layer and base layer elastic modulus ratio, as well as the thickness ratio. But stiffness parameter may also decrease with the increase of the thickness ratio when the specific value of constrained layer and base layer elastic modulus ratio is bigger while the interval number is smaller. The results can provide some reference for the study of damping treatment.

    • Design of double DC motor control system based on DSP

      2017, 38(5):424-431. DOI: 10.7535/hbkd.2017yx05003

      Abstract (2205) HTML (0) PDF 1.40 M (2774) Comment (0) Favorites

      Abstract:Aiming at the problems of speed control, commutation and so on in the multi-motor synchronous control system, based on automatic control technology, a control system with PC as principal computer and DSP as slave computer is designed, which can change dual DC motor speed and steering, as well as select work drive motors. Related hardware and software design of the control system are given. Through serial communication between DSP and PC using PC serial port software, digital control command is sent to the slave computer for controlling dual DC motor to do a series of preset functions. PWM pulse width modulation is used for motor speed regulation, photoelectric encoder is used to measure motor speed by T method, and the motor speed is displayed by the actual waveform. Experimental results show that the system can not only realize the synchronization of dual DC motor speed and steering adjustment, but also select the motor and achieve the dual DC motors synchronization control effect. The control system has certain reliability and effectiveness.

    • Vehicle speed guidance strategy at signalized intersection based on cooperative vehicle infrastructure system

      2017, 38(5):432-437. DOI: 10.7535/hbkd.2017yx05004

      Abstract (2713) HTML (0) PDF 1.21 M (2947) Comment (0) Favorites

      Abstract:In order to reduce stopping time of vehicle at a signalized intersection, aiming at the difficulty, even the impossibility to obtain real-time queue length of intersection in third and fourth-tier cities in China sometimes, a speed guidance strategy based on cooperative vehicle infrastructure system is put forward and studied. For validating the strategy, the traffic signal timing data of the intersection at Hengshan Road and North Fengming Lake Road in Wuhu is collected by a vehicular traffic signal reminder system which is designed. The simulation experiments using the acquired data are done by software VISSIM. The simulation results demonstrate that the strategy under high and low traffic flow can effectively decrease the link travel-time, reducing average ratio is 9.2 % and 13.0 %, respectively, and the effect under low traffic flow is better than that under high traffic flow. The strategy improves efficiency of traffic at a signalized intersection and provides an idea for the application of vehicle speed guidance based on cooperative vehicle infrastructure system.

    • A fast monocular visual odometry pose estimation method for self-driving vehicles

      2017, 38(5):438-444. DOI: 10.7535/hbkd.2017yx05005

      Abstract (2842) HTML (0) PDF 930.53 K (1923) Comment (0) Favorites

      Abstract:Aiming at the problem that the traditional pose estimation algorithm of monocular odometry cannot meet the needs of real-time localization of self-driving vehicles, a fast pose estimation algorithm based on the improvement of the fundamental matrix is proposed. By optimizing the calculation process of the fundamental matrix, the real-time performance of the algorithm is improved. The fundamental matrix with 8 unknown parameters is first obtained, and then the feature matching point pairs are used to solve the fundamental matrix. Through simulation experiments, the efficiency and accuracy of the algorithm are analyzed, and then it is compared with the existing algorithms. Experimental results show that the proposed algorithm can improve the speed of motion estimation by 4 times without the reduction of the accuracy of motion estimation. The study provides certain reference value to the real time application of the visual odometry of self-driving vehicles.

    • >Chemistry and Chemical Industry
    • Desulfurization performance of azole-based ionic liquids

      2017, 38(5):445-452. DOI: 10.7535/hbkd.2017yx05006

      Abstract (1642) HTML (0) PDF 1023.95 K (2003) Comment (0) Favorites

      Abstract:In order to study the addition of functional groups in ionic liquid anion and cation to achieve better absorbing of SO2, the 1,1,3,3-tetramethylguanidine triazole ([TMG][Triz]) is synthesized using 1,1,3,3-tetramethylguanidine and triazole as raw materials. The desulfurization performance of the synthesized [TMG][Triz] is systematically studied. The desulfurization performance and desulfurization mechanism of the [TMG][Triz] are discussed. The results show that the [TMG][Triz] has good performance of desulfurization and regeneration. At the atmospheric pressure, 1 mol of the [TMG][Triz] absorbs 2.964 mol of SO2 at 20 ℃. With the increase of temperature, the desulfurization capacity of the [TMG][Triz] decreases gradually. The molar absorption ratio increases with the increase of SO2 partial pressure, and under the conditions of 130 ℃, the desorption rate of the ionic liquid after saturated adsorption reaches over 95%. The mechanism investigation results show that the interaction of SO2 and [TMG][Triz] is the combination of chemical absorption and physical absorption. The results have a certain reference value to improve the efficiency of flue gas treatment.

    • Study on the synthesis of novel TiO2-copper porphyrin catalyst and photocatalytic degradation of methyl orange

      2017, 38(5):453-459. DOI: 10.7535/hbkd.2017yx05007

      Abstract (1768) HTML (0) PDF 1.11 M (1090) Comment (0) Favorites

      Abstract:In order to study the effect of different length side chain catalysts on photocatalytic degradation of methyl orange solution, solving the poroblem of water pollution control, four novel porphyrins and their corresponding copper complexes are synthesized from the starting material 1-naphthol, and their structures are characterized by MS, NMR and elemental analysis. Novel TiO2-porphyrins hybrid systems are prepared and its photocatalytic activity is investigated by photodegradation of methyl orange in aqueous solution under visible light. The results indicate that when there are side chains on the benzene ring of copper-porphyrin derivatives, the photocatalytic activity of substituted TiO2-copper porphyrins is better than TiO2-copper tetraphenyl porphyrin, but the effect of the side chains' length on the activity is not obvious. This study provides an idea for the synthesis of highly efficient catalysts in the future.

    • Research progress in carbon dioxide capture using phase-change absorbents

      2017, 38(5):460-468. DOI: 10.7535/hbkd.2017yx05008

      Abstract (2493) HTML (0) PDF 1.68 M (2162) Comment (0) Favorites

      Abstract:The emission of CO2 gas by human industrial activity is the main factor that contributes to global warming, while the CO2 capture, storage and utilization (CCUS) are the most effective technical direction to achieve carbon reduction and fight against global warming. In commonly used CO2 capture technologies, the main technical difficulty in the use of aqueous solutions of organic amine absorbent for CO2 capture is that the renewable energy consumption is high. How to reduce the energy consumption has the direct bearing on the CCUS technology's future development. Phase-change absorbents have excellent absorption characteristics in absorbing CO2, and can be separated into liquid-liquid or liquid-solid two-phase. One of the two-phase is enriched by CO2, which presents a significant advantage in reducing energy consumption. Through analysis of the structure of energy consumption of CO2 removal process using the traditional organic amine solutions, the research status of CO2 phase change absorption system on carbon capture is reviewed. The phase transformation research trends and development prospects of the absorbents are provided, which is to explore the phase transformation mechanism of phase change absorbents, and to solve the problems of the composition and process stability; to research catalytic regenerative technologies of new type absorbents, heat resistant enzyme and solid acid such as microcapsules and polar oscillations.

    • >Mechanical, Electronics and Information Science
    • Nonlinear dynamic analysis of single-sided & single-mass crushing system under impact and vibration

      2017, 38(5):469-473. DOI: 10.7535/hbkd.2017yx05009

      Abstract (2033) HTML (0) PDF 621.87 K (2085) Comment (0) Favorites

      Abstract:To research and develop efficient vibrating type crusher, a single-sided dynamic model is established for the impact and vibration crushing system, and the differential equation of vibration is set up with Newton's law for dynamic analysis. By making amplitude frequency curve, hysteretic impact force curve and energy absorption curve, the influence of which on the system response is analyzed. Based on the conclusion and using numerical method, the primary forced resonance of the system is calculated, and the time history of displacement, velocity and acceleration is obtained, showing that the motion mass movement is not a simple harmonic motion, the nonlinear impact force is one of the factors that influences the vibration system, and the influence rules of clearance, vibration frequency on the amplitude frequency curve, impact force and energy absorption are also obtained. The gap between the material and the broken head should be kept as small as possible so as to achieve a better crushing effect with a smaller excitation force, and the system is best to work in the main resonant area to get a big impact. The research result provides reference for further study of rules and mechanism of the vibration systems.

    • Application of carbon nanotubes flexible strain sensor in smart textiles

      2017, 38(5):474-479. DOI: 10.7535/hbkd.2017yx05010

      Abstract (1811) HTML (0) PDF 1.52 M (2006) Comment (0) Favorites

      Abstract:Smart textiles have not only the necessary functions of daily wear, but also the intelligence. The focus of the current textile materials research is the selection of flexible material. For flexible materials, carbon material is one of the ideal materials for preparing flexible strain gauges. The application of flexible strain sensor prepared by carbon nanotubes as a flexible material in smart textiles is the research content. The research status of carbon nanotubes flexible strain sensor is introduced from the aspects of the structure, properties and application. The characteristics and functions of flexible strain gages prepared with carbon nanotube fibers and carbon nanotube films as flexible materials are discussed in terms of selection, preparation method, performance test and application. At the same time, the advantages and disadvantages of the flexible strain sensor of carbon nanotubes are reviewed from the aspects of preparation difficulty, production cost and practical application effect. High sensitivity with high strain will be a key research direction for carbon nanotube flexible strain sensors.

    • >Special Column: New Energy Resources, Energy Conservation and Environmental Protection
    • Preparation of CdS nanoparticels with spin-coating assisted successive ionic layer reaction and their photoelectrochemical properties

      2017, 38(5):480-485. DOI: 10.7535/hbkd.2017yx05011

      Abstract (1889) HTML (0) PDF 1.38 M (1802) Comment (0) Favorites

      Abstract:In order to settle the problems in the traditional SILAR method for CdS deposition, such as smaller particles and being difficult to enhance the sensitive layers, an improved spin-coating assisted successive ionic layer reaction method (S-SILR) substituted for the traditional SILAR method is used to deposit the CdS nanocrystals. The comparison between the improved and traditional methods is studied after depositing the CdS nanocrystals onto the ZnO nanorod arrays with the two approaches. Different analysis methods, SEM, XRD, UV-vis and the transit photocurrent measurement are conducted to characterize the morphologies and structures of the samples, as well as investigating the light absorption properties, and the photoelectric conversion performance of the electrodes. The results indicate that the CdS nanocrystals photosensitive layers could be totally coated onto the ZnO nanorod arrays more easily by the improved S-SILR method; the light absorption properties and the photoelectric conversion performance of the electrodes prepared by the improved S-SILR method are more excellent compared with those electrodes prepared by the traditional SILAR method. The improvement of the CdS deposition method has certain guiding significance in enhancing the operability of the preparation technology and the photovoltaic performance of the solar cells.

    • Modification of heterojunction surface/interfacial to optimize the hybrid solar cells efficiency

      2017, 38(5):486-492. DOI: 10.7535/hbkd.2017yx05012

      Abstract (2538) HTML (0) PDF 1.23 M (2031) Comment (0) Favorites

      Abstract:In order to improve the compatibility between inorganic semiconductor and organic polymer semiconductor, and optimize the photoelectric performance of the battery, a hybrid solar cell of TiO2/PCPDTBT based on one dimensional inorganic TiO2 nanorods ordered arrays and organic polymer PCPDTBT is constructed. The heterojunction interface properties between the inorganic and organic materials are controlled by amphiphilic organic triphenylamine-type molecules. The properties of the hybrid films are characterized by scanning electron microscope (SEM), transmission electron microscope (TEM), X-ray diffraction (XRD), energy dispersive spectrometer (EDS), UV-vis spectra (UV-vis), photoluminescence spectroscopy (PL), etc.. The battery performance tests demonstrate that the photovoltaic performance of the modified cell is improved, and the power conversion efficiency η is of 0.81%. Open circuit voltage decay tests demonstrate that the electron lifetime is increased after heterojunction surface/interfacial modification. These results indicate that the amelioration of morphology and structure of the active layer plays an important role on solar cell performance, by means of modification of the heterojunction surface/interface.

    • Research of the influencing factors of the immobilized redox mediators accelerating Cr(Ⅵ) reduction by Escherichia coli BL21

      2017, 38(5):493-498. DOI: 10.7535/hbkd.2017yx05013

      Abstract (1923) HTML (0) PDF 939.68 K (1884) Comment (0) Favorites

      Abstract:In order to study the influencing factors of non-dissolved redox mediators on Cr (Ⅵ) bioreduction, the accelerating effect of non-dissolved redox mediators immobilized by cellulose acetate (CA) on the reduction of Cr(Ⅵ) by Escherichia coli BL21 is investigated. The results show that the accelerating order is 1-chloroanthraquinone>1,5-dichloroanthraquinone>2-chloroanthraquinone>1,8-dichloroanthraquinone>anthraquinone>1,4,5,8-tetrachloroanthtaquinone; the optimal concentration of 1-chloroanthraquinone pH and initial Cr(Ⅵ) concentration are 0.048 mol/L, 7.00 and 30 mg/L, respectively; the removal rate increases with the increasing temperature when it is in the range of 20~60 ℃; after 6 times of recycling experiments, and the Cr(Ⅵ) bioreduction rate with the immobilized 1-chloroanthraquinone maintains above 5 times of margin bacterium's. It indicates that non-dissolved redox mediators immobilized by CA can effectively accelerate the reduction rate of Cr(Ⅵ) by Escherichia coli BL21, which has favourable application value.

    • Characteristic analysis of the soluble microbial products(SMP) in the industrial wastewater treatment process

      2017, 38(5):499-506. DOI: 10.7535/hbkd.2017yx05014

      Abstract (1826) HTML (0) PDF 1.60 M (1902) Comment (0) Favorites

      Abstract:To optimize anoxic aerobic (A/O) wastewater treatment process and improve effluent quality, the variations of soluble microbial products(SMP)in the treatment process is investigated. The fluorescence characteristics of SMP in A/O process are studied through ultraviolet-visible (UV-sis) spectra,fluorescence excitation-emission matrix (EEM), and the multivariate statistical method. The liner relationships between FRI and COD and NH+4-N are analyzed. The composition and metabolism of the SMPs are studied. The results show that Pearson correlation indices between COD, ammonia nitrogen and normalized integral volumes of region Ⅰ and Ⅱ are both higher than 0.97. The humus-alike and the protein-like substances are the main fluorescence substances of the process. And the concentration of humus-alike remains at 40 × 106 au·nm2 in the aerobic stage, which is not totally removed in the A/O process. The concentration of the protein-like substances are reduced from 25.43% down to 2% by metabolism, and most of the protein-like substances are removed at the anoxic zone. The method could be used for rapidly monitoring the concentration of COD and the composition of organic matter in water, which provides technique reference for the improvement of A/O process parameters.

Editor in chief:朱立光

Inauguration:

International standard number:ISSN 1008-1542

Unified domestic issue:CN 13-1225/TS

Domestic postal code:

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