Editor in chief：朱立光
International standard number：ISSN 1008-1542
Unified domestic issue：CN 13-1225/TS
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2007, 28(3):169-173. DOI: 10.7535/hbkd.2007yx03001
Abstract:The connotation and practical feasibility of circular economic,and the relation between circular economic and harmonious society, were discussed in view of the problems encountered in the present economy development of our country.Three platforms:theory platform, engineering practice platform and the platform on ecological ethics, regulations and morality, were proposed and the necessity of these platforms'' construction in circular economic was expounded.The guidence roles of circular economic to chemical industry, especially to energy chemical industry, bio-chemical industry and ecological chemical industry, were introduced.
2007, 28(3):174-177. DOI: 10.7535/hbkd.2007yx03002
Abstract:A boundary value problem with a kind of shift for generalized analytic functions in the space C2is discussed and the existence (uniqueness) of the solution is proved by the application of the integral function and the compressing projection principle.
2007, 28(3):178-179,185. DOI: 10.7535/hbkd.2007yx03003
Abstract:Let(Mr,T) denote a smooth involution on a closed manifold T of dimension r (r>2m+4) with fixed point set F.In this paper,the bordism classes of the involutions with F=RP1(2m)∪RP2(2m)∪RP(3) are determined(m is a odd number).Here RP denotes the real projective space.
2007, 28(3):180-185. DOI: 10.7535/hbkd.2007yx03004
Abstract:We investigate H∞ state feedback control for a networked control system with time-varying delays and parameter uncertainties. A time-delay dependent robust stability criterion satisfying a prescribed H∞ norm bound is given in the form of linear matrix inequalities by using the Lyapunov-Krasovskii functional method. Then the criterion is transformed into a sufficient condition for H∞ control, the condition obtained is also used to design an H∞ state feedback controller. A numerical example is given to illustrate the effectiveness and feasibility of the proposed approach.
2007, 28(3):186-189. DOI: 10.7535/hbkd.2007yx03005
Abstract:By using double set parameter method of finite element theory,and by taking into consideration quadrilateral elements and trapezoidal element,we constructed a kind of 12-Parameter trapezoid plat elements and proved their convergence. These trapezoid plat elements can be used for any polygon, so it is useful in practice.
2007, 28(3):190-193. DOI: 10.7535/hbkd.2007yx03006
Abstract:According to the law of the string vibration standing wave,we have proven the rule that each vibration oscillation amplitude of the stringed musical instrument decreases progressively.The accurate overtone string position during the performance was also given.The overtone physical essence of bowed instrument was revealed.It''s the theoretic basis for designing the sound territory and strengthening the natural overtone.
2007, 28(3):194-197,217. DOI: 10.7535/hbkd.2007yx03007
Abstract:By using the coherent quantum transport theory and transfer matrix method, the transmission coefficient and tunnel magnetic resistance for polarized electrons with different spin orientations through ferromagnetic/semiconductor/ferromagnetic tunnel junctions are investigated. The results indicate that the transmission coefficient and tunnel magnetic resistance changes periodicaly in accordance with the change of the length of the semiconductor, and changes quasi-periodically with the change of the Rashba spin-orbit effect. A moderate length of the semiconductor and appropriate Rashba spin-orbit effect allow a giant tunnel magnetic resistance with parallel magnetization.
2007, 28(3):198-201. DOI: 10.7535/hbkd.2007yx03008
Abstract:With multiple emulsifier(SDS/SDBS) as initiators,St/BA microemulsion polymerization was initiated by the water-soluble potassium persulfate(KPS),oil-soluble benzoyl peroxide(BPO) and potassium persulfate/sodium sulfite(OR),and the behaviors of microemulsion polymerization were investigated. St/BA copolymer chemical composition and copolymer composition curves were obtained from Fourier infrared spectrums,and reactivity ratio of St/BA microemulsion polymerization initiated by three kinds of initiators were calculated.
2007, 28(3):202-205. DOI: 10.7535/hbkd.2007yx03009
Abstract:Nano-TiO2particles was prepared by sol-gel method. A lot of factors that affect the photocatalytic activity of nano-TiO2were studied by the degradation of methyl orange. The obtained TiO2are characterized by TEM, XRD,etc. Results show that TiO2shows optimal photocatalytic activity when the volume ratio of TNB, ethanol, acetic acid and distilled water is 10∶19∶8∶4, baked at 500℃ for 2hours, and the proper dosage of TiO2is 1g/L; the as-prepared TiO2is anatase phase, and the mean size is 10～20nm.
2007, 28(3):206-208,221. DOI: 10.7535/hbkd.2007yx03010
Abstract:The colour reaction of T(4-MOP)PS4with Pb(Ⅱ) is studied. The results show that heat not needed,the apparent molar absorption coefficient is 2.11×105L·mol-1·cm-1 and linear range is 0~1.1μg/mL,and the ability of anti-jamming is high. The proposed method is applied to determine Pb(Ⅱ) in samples such as preserved eggs, hair, tea, wine, drainage water,industrial waste drainage,food packaging bags,canned food and leek. The results are satisfying.
2007, 28(3):209-211,221. DOI: 10.7535/hbkd.2007yx03011
Abstract:A method is developed for the determination of fatty acids in oils by capillary gas chromatography. The analysis conditions are optimized. A SE-30capillary column(25m×0.22mm×0.2μm) is used with the column temperature at 190℃, the flow rate of carrier gas at 1mL/min, and the split ratio of 1∶100. The contents of fatty acids in cotton seed oil, peanut oil, soybean oil, millet oil and lard oil are determined. The results show that the content of unsaturated fatty acids is normally higher than that of the saturated fatty acids. In tested oils, the content of linoleic acid in soybean oil is the highest, up to 60.02%.The content of unsaturated fatty acids in vegetable oil is higher than that in lard oil,while in millet oils up to 84.33%,and in lard up to 50.43%.
2007, 28(3):212-214. DOI: 10.7535/hbkd.2007yx03012
Abstract:Supercritical fluid extraction (SFE) is a promising new and green separation technology. In order to promote its application, based on the characteristics of supercritical system, the suitable equation of state, together with the modified mixing rule and the equation parameter, was proposed to calculate the solute solubility in supercritical CO2with and without cosolvent respectively, and the calculating process was listed.
2007, 28(3):215-217. DOI: 10.7535/hbkd.2007yx03013
Abstract:The antibiotics in freshwater fish poses a threat to human health through the food chain. The experiments were proceeded after selecting wavelengh, moving phase, velocity of flow and distilling methods, in which Spherisorb C18 column was used,and V(acetonitrile) /V( disodium hydrogen phosphate) (including 0.001mol/L EDTA) =28/72was regarded as the moving phase and λ was 355nm. Aureomycin, terramycin and tetracycline in freshwater fish were quantitatively detected. The average recovery was 98.0% and the average relative standard deviation was 4.63%.
2007, 28(3):218-221. DOI: 10.7535/hbkd.2007yx03014
Abstract:Mixed unsaturated fatty acid which mainly contains C18 were hydrogenated with the Ni unitary as the catalyst under different temperature.The focus is laid on the trend of the iodine value and freezing point which change with the service temperature at various points of time or pressures. Then the adopted service pressure and time were found to be 0.4MPa and 1.0h. And the tropic and formula of iodine value-temperature and freezing point-temperature were obtained. The best service temperature was calculated to be 190℃.
2007, 28(3):222-225. DOI: 10.7535/hbkd.2007yx03015
Abstract:The Fe-Cr fibers are extracted from Cu-11Fe-4Cr in-situ composites by using a selective etching technique,and the electrode potential of the fibers is determinated. By means of Salt spray tests and polarization curves measurements, the corrosion behavior of Cu-11Fe-4Cr composites in HSO-3and/or Cl media is studied. The corrosion products and corrosion surface are analysed by scanning electron microscope. The results show that In Cu-11Fe-4Cr in situ composites,E(Cu)
2007, 28(3):226-229. DOI: 10.7535/hbkd.2007yx03016
Abstract:Shot peening was applied to 1Cr13alloy for different periods of time(5min,10min,20min and 40min) and the effects of this treatment on the selective oxidation behaviour at 800℃ for 100h have been studied. The experimental results and metallographic analysis show that shot peening forms a micro-crystalline coating on the surface of 1Cr13alloy, which lowers the critical Cr content to form continuous selective oxide scales, and thus the mass gain of the oxide scales is significantly decreased and the spallation of the oxide scales is also reduced. Shot peening promotes the formation of a protective and selective scales, thus improving the high-temperature oxidation resistance of the stainless steel greatly. The effect of shot peening for 10～20min is the best.
2007, 28(3):230-233. DOI: 10.7535/hbkd.2007yx03017
Abstract:The function of user-defined parametric part provided by CAXA solid can used be to construct 3D models and define their variables. Through dynamic linking between CAXA Solid and Excel, 3D models are driven by the list data constructed in Excel,and then the parametric design of butterfly valve components and parts is realized.
2007, 28(3):234-237. DOI: 10.7535/hbkd.2007yx03018
Abstract:Campus network is the most important part of the college, and its safety status directly influences the teaching activities. Meanwhile, Linux is an open system, and many programs and development tools for it could be found from Internet. This status not only brings great convenience, but also opens a gate for the hackers. This paper introduces some setting methods of Linux system functions, and some protective measures in routine maintenance.It also puts forward some advice on strengthening the security of Linux system.
2007, 28(3):238. DOI: 10.7535/hbkd.2007yx03019
Abstract:On the basis of analyzing the taxation information management system, this paper introduces the structure of a tax information searching and analyzing system based on data warehouse and the OLAP, for advancing the abilities of planning, decision-making, implementation and management of taxation,thus realizing the use of IT in taxation management.