Editor in chief：朱立光
International standard number：ISSN 1008-1542
Unified domestic issue：CN 13-1225/TS
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2015, 36(6):553-558. DOI: 10.7535/hbkd.2015yx06001
Abstract:In order to explore the cutting laws of difficult-to-machine material 27SiMn steel, an orthogonal method is employed in its cutting experiment by using carbide tool. The relationship between cutting process parameters (when cutting depth is 0.3～0.8 mm, feed rate is 0.08～0.2 mm/r, and rotating speed is 200～400 r/min) and three dimensional cutting forces is revealed, and the empirical formulas of three dimensional cutting forces are deduced by using the linear regression method. Experimental results show that cutting depth is the most influential factor in cutting force, followed by feed rate and cutting speed. Cutting force is positively correlated with cutting depth and feed rate, but when rotating speed is over 320 r/min, the cutting force decreases. The cutting force effect of empirical formula is verified through significance test.
2015, 36(6):559-565. DOI: 10.7535/hbkd.2015yx06002
Abstract:Aiming at the vehicle driver's steering characteristic classification and identification, the research method is initially explored based on CarSim simulation platform. The simulation experiment of steering condition is designed and the test data is collected. According to the maximum yaw rate of the vehicle, the driver steering characteristics are classified by K-means clustering algorithm. The driver steering characteristics identification models are established by learning vector quantization (LVQ) neural network, BP neural network, and support vector machine (SVM) respectively in the environment of Matlab software. The test experiment and comparison are done for the three kinds of approaches, and the results show that all those three kinds of identification approaches have high accuracy, and the SVM method has a certain advantage on driver steering characteristics identification.
2015, 36(6):566-572. DOI: 10.7535/hbkd.2015yx06003
Abstract:Focusing on the recognition of ramp angle, the relationship between the signal of vehicle transducer and real ramp angle is studied. The force change of vehicle on the ramp, and the relationship between the body tilt angle and front and rear suspension scale is discussed. According to the suspension and tire deformation, error angle of the ramp angle is deduced. A mathematical model is established with Matlab/Simulink and used for simulation to generate error curve of ramp angle. The results show that the error angle increases with the increasing of the ramp angle, and the limit value can reach 6.5%, while the identification method can effectively eliminate this error, and enhance the accuracy of ramp angle recognition.
2015, 36(6):573-576. DOI: 10.7535/hbkd.2015yx06004
Abstract:Let (Mr,T) be a smooth closed manifold of dimension r with a smooth involution T whose fixed point set is F=HP1(2m)∪HP2(2m)∪HP(2n+1)(m≥1)， where HP(n) denotes the n-dimensional quaternionic projective space. By constructing symmetric polynomial and computing characteristic number, it is proved that when r>8m+8n+8, every involution (Mr,T) fixes F bounds.
2015, 36(6):577-586. DOI: 10.7535/hbkd.2015yx06005
Abstract:In this paper, we use Bananch's contraction mapping principle and Schauder’s fixed point theorem to study the existence and uniqueness of solutions for nonlocal boundary value problems of fractional differential equations with the nonlinear term dependent in a fractional derivative of lower order on infinite intervals， Dα0+u(t)=f(t,u(t),Dα-10+u(t)),〓t∈J,u(0)=0,〓Dα-1</sub>0+u(∞)=∑ m-2 t=1 βiu(ηi) and extend the existing relevant conclusions. We have given some examples to demonstrate the correctness of the main results.
2015, 36(6):587-592. DOI: 10.7535/hbkd.2015yx06006
Abstract:In this paper, we study the SIS epidemic reaction-diffusion model with the saturated treatment. We obtain the prevalence threshold value of disease, namely the basic reproduction number R0, based on the least eigenvalue. We have proved that the unique disease-free equilibrium is local stable when R0<1, while the disease-free equilibrium is unstable and the endemic equilibrium exists when R0>1. Through numerical simulation, we discuss the influence of treatment on prevalence of disease. When disease outbreaks, it is efficient to increase cure rate for the control of the disease, while expanding the scale of hospitals will cause even more prevalence of the disease.
2015, 36(6):593-597. DOI: 10.7535/hbkd.2015yx06007
Abstract:This paper studies the following Caputo fractional differential equation with p-Laplacian of higher-order multi-point： Dβ0+(p(Dα0+u(t)))+f(t,u(t))=0,〓0≤t≤1,l-1<β≤l,n-1<α≤n,(p(Dα0+u(0)))(i)=0,〓i=0,1,2,…,l-1,u(i)(0)=0,〓i=1,2,…,n-1,〓u(1)=∑ m-2 i=1 aiu(ξi)。 Using the Schauder fixed point theorem, the existence of positive solution is obtained for the above boundary value problems. An example is presented to illustrate our main theorem.
2015, 36(6):598-605. DOI: 10.7535/hbkd.2015yx06008
Abstract:The hemicellulose super water absorbent resin is prepared by using ultrasonic irradiation technology, with the waste liquid produced during the preparation of viscose fiber which contains a large amount of hemicellulose as raw material, acrylic acid as graft monomer, N,N’-methylene bis acrylamide (NMBA) as cross linking agent, and (NH4)2S2O8-NaHSO3 as the redox initiation system. The synthesis conditions, structure and water absorption ability of resin are discussed. The results indicate that water absorbency of the resin is 311 g/g, the tap water absorbency is 102 g/g, the normal saline absorbency is 55 g/g， and the artificial urine absorbency is 31 g/g under the optimal synthesis conditions, so the resin has great water absorption rate and water retaining capacity. The FT-IR and SEM analysis shows that the resin with honeycomb network structure is prepared. The successfully synthesized of the resin means that the hemicellulose waste liquid can be highly effectively recycled, and it provides a kind of new raw material for the synthesis of super water absorbent resin.
2015, 36(6):606-612. DOI: 10.7535/hbkd.2015yx06009
Abstract:In order to improve the dissolution of azithromycin, azithromycin nanocrystals tablets are studied based on the nanocrystal technology. The media milling method is employed to prepare azithromycin nanocrystals, from which azithromycin nanocrystals tablets are made. The quality of the tablets is evaluated referring to Chinese Pharmacopoeia, the dissolution rates are measured by paddle method, and the content and related substances are determined by HPLC. The stabilities are investigated by impact factors test, short-time test and retention samples test. The results show that the quality of the homemade tablets meets the requirements of tablets in Appendix of volume Ⅱ of Chinese Pharmacopoeia (2010), and their dissolution rates increases significantly compared with the reference preparations. Impact factors test indicates that the homemade tablets are stable in the condition of high temperature or strong light but sensitive to environmental humidity. Short-time test and retention samples test results show that the homemade tablets are stable within 6 months, so they should be sealed and stored in a cool dry place.
2015, 36(6):613-618. DOI: 10.7535/hbkd.2015yx06010
Abstract:With Nisin-producing Lactococcus lactis as the starting strain, the strain with tolerance to 10 000 IU/mL Nisin is selected on high-concentration Nisin medium. The Nisin titer of the strain is up to 1 680 IU/mL. As the starting strain, the strain is further treated by atmospheric and room temperature plasmas(ARTP) and mutant strain for high yield of Nisin is quickly selected with 24 well culture plate. At a survival rate of 3%, the positive mutation rate of the Lactococcus lactis is 273% compared with the starting strain. The results of shake flask culture further confirmed that one positive mutant strains could produce 6 120 IU/mL Nisin.
2015, 36(6):619-624. DOI: 10.7535/hbkd.2015yx06011
Abstract:Aiming at focusing-type solar simulator, the paper researches the relationship between the defocusing amount and the facula irradiance. With the optical system of focusing-type solar simulator as research object, simulation is conducted based on a short-arc xenon lamps and its ellipsoidal condenser. According to the xenon lamp energy distribution figure and its distribution curve flux, the luminous body is simplified to cylindrical luminous light which emits light only on the flank. Model for the simplified luminous light and its ellipsoidal condenser are established in the optical simulation software TracePro, and the impact of axial and radial deviation on the facula is simulated. The results show that light off-focus has little influence on the average of facula irradiance, but has great influence on the maximum value and the distribution of facula irradiance as well as the facula area. The result provides a theoretical reference for the design and alignment of solar simulator focusing system.
2015, 36(6):625-632. DOI: 10.7535/hbkd.2015yx06012
Abstract:In order to achieve the automation drilling of the improved CMJ2-27 drill, kinematic analysis of the drill rig is conducted aiming the collision between the arms and the roadway during the operation process. By suing the Denavit-Hartenberg (D-H) method, the transformation matrix of coordinate system is obtained， then the coordinates of each joint and the ends are derived. The collision detection approach between the arm and the roadway is given. Theoretical calculation and the motion simulation experiment are conducted by using the detection method for a 88-hole drilling program for a mine. The research results show that the method is feasible and has the characteristics of simple procedures and high efficiency.
2015, 36(6):633-638. DOI: 10.7535/hbkd.2015yx06013
Abstract:Phenylalanine ammonia lyase (PAL) is a key enzyme for production of L-phenylalanine. Currently, PAL is mainly obtained from Rhodotorula PAL However, Rhodotorula PAL exhibits poor stability, which limits its industrial application. In this study, bioimprinting cross-linked enzyme aggregates of PAL (PAL-iCLEAs) is developed by combining cross-linked enzyme aggregates technology and imprinted enzyme method. The most optimal imprinting molecule substrate is screened. Moreover, some characteristics of the PAL-iCLEAs are examined. The results show that the most suitable substrates for preparing PAL-iCLEAs is tran-cinnamic acid. The optimal temperature and pH was 50 ℃ and 10.5, respectively. In addition, PAL-iCLEAs shows good reusability, the recovery of PAL activity still remained 32% after reusing 9 times.
2015, 36(6):639-643. DOI: 10.7535/hbkd.2015yx06014
Abstract:Avermectin-salinomycin waster is hard to be further biodegraded after treated by anaerobic-aerobiotic process, so Fenton oxidation process is studied for its advanced treatment. Influencing factors of pH, reaction time, H2O2 dosage and H2O2/Fe2+ on COD removal are investigated, respectively. When pH value is 3.0, the dosage of H2O2 is 1.5 mL/L, and the mole ratio of H2O2/Fe2+ is 5∶1, the effluent COD mass concentrations decreases from 224 to 64.3 mg/L, namely the COD removal efficiency reaches 71.3%.
2015, 36(6):644-651. DOI: 10.7535/hbkd.2015yx06015
Abstract:Based on the data from 2003 to 2012 related to economy, water environment, land and natural resources of Weichang County, pressure-state-response model is used to construct an ecological security early-warning indicator system of Weichang County from three aspects-pressure, state and response. Fuzzy evaluation method combined with early-warning index and warning degree standard are applied to analyze the ecological security alarm conditions of Weichang County from 2003 to 2012. The results show that the ecological security warning index of Weichang County generally has a fluctuating upward trend from 2003 to 2012, and the value rises from 5.278 1 in 2003 to 6.809 1 in 2012, which means the county is in the "light warning" state, tending to the warning state. In terms of pressure, state, response subsystems, the early-warning index of pressure, state and response is on the rise from 2003 to 2012, which indicates a good development trend.
2015, 36(6):652-658. DOI: 10.7535/hbkd.2015yx06016
Abstract:The environmental pollution of perchlorate is more and more serious because of its widely usage. Several parameters affecting perchlorate degradation are examined through batch experiments by perchlorate-degrading bacteria, which include temperature, pH, the concentration of carbon source, ClO-4, NO-3, and water-soluble and water-insoluble quinone compounds. Perchlorate-degrading bacteria is collected and enriched from a sewage treatment plant. The results suggested that the optimal conditions for perchlorate biodegradation are 30 ℃, pH 7.5~8.5 and 2.4 g/L acetate. Different NO-3 concentrations have significant effect on perchlorate biodegradation. The higher the initial concentration of ClO-4, the faster the degradation rate. The acceleration effect of AQDS is the best among dissolved quinone compounds, and the optimal concentration is 1.44 mmol/L. The acceleration effects of 1,5-dichloroanthraquinone is best among non-dissolved quinone compounds, and the optimal concentration is 0.090 mmol/L.