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Four new sesquiterpenoids, sesquiterpenoids A–D (1–4), were isolated from solid cultures of the Xylariaceae fungus (no. 63-19-7-3). Their structures were determined through NMR analyses, CD calculation, the in situ dimolybdenum CD method, the modified Mosher's method, and X-ray data analysis. The cytotoxicities of all compounds against HL-60, SMMC-7721, A-549, MCF-7 and SW480 human cancer cell lines were assayed.

Sporormiellin A (1), the first tetrahydrofuran-fused furochromone with an unprecedented tetracyclic skeleton, has been obtained from the fungal strain Sporormiella minima. The structure with absolute configuration was elucidated by NMR data, X-ray crystallography, and quantum chemical ECD calculations.

7- O -methylvariecolortide A ( 1 ), variecolortide B ( 2 ), and variecolortide C ( 3 ), the rare variecolortides existing in racemic manner, were isolated from an endolichenic fungal strain Eurotium sp. (No. 17-11-8-1). With the chiral HPLC technology, (−)-( S )-7- O -methylvariecolortide A ( 1a ), (+)-( R )-7- O -methylvariecolortide A ( 1b ), (−)-( S )-variecolortide B ( 2a ), (+)-( R )-variecolortide B ( 2b ), (−)-( S )-variecolortide C ( 3a ), and (+)-( R )-variecolortide C ( 3b ) were successfully separated and obtained. Their absolute configurations were firstly assigned by ECD experiment and ECD calculation. According to the relation of isolated compounds, a plausible biosynthetic pathway for variecolortides was proposed. In caspase-3 enzymatic assay, compounds 1 – 3 showed inhibitory activity, with IC 50 values of 1.7, 0.8 and 15.7 μM, respectively.

Exfoliated graphite with large expanding volume (EV) was prepared by two-step intercalation, in which the mixture of nitric acid and phosphoric acid, and that of nitric acid and acetic acid were employed as intercalating agent step by step, and potassium permanganate was used as oxidant. Its preparation conditions were optimized by orthogonal experiment and parallel experiment, and its microstructure was analyzed by scanning electron microscope. The results show that the optimal preparation conditions for the first step intercalation are as follows: the mass-volume ratio of natural graphite (NG) to mixed acid is 1: 4, the volume ratio of nitric acid to phosphoric acid is 1: 2, the mass ratio of NG to potassium permanganate is 1: 0.2, and the reaction temperature is 20~30°C for 40~60 minutes. Those for the second step intercalation are as follows: the mass-volume ratio of acidized graphite (AG) to acetic acid is 1: 5, the mass-volume ratio of AG to nitric acid is 1: 1.5, the mass ratio of AG to potassium permanganate is 1: 0.15, and the reaction temperature is 20~30°C for 40~60 minutes, the EV is 450ml/g under the conditions listed above. The interlayers of graphite are fully opened and become a worm-like fluffy rope.

In the present study, the patterns of phase synchronization in an acupuncturing task were investigated. Neiguan (PC6) and Shenmen (HT7) are the main acupoints, they are both the main points for heart diseases and insomnia, epilepsy, mental disorder. The task was divided up into the following parts, the resting condition; needling sensation; needling with power on for 20 minutes; needling retaining and needling extraction. The index of phase synchronization in different parts was calculated and compared. Phase synchronization was increased in alpha band in many cognitive, attention tasks. These findings suggest that the transient network of coupled cortical regions maybe mediated through neural synchronization. The result in this paper shows that during electro-acupuncture about 15 minutes, the index between the available electrodes in the hindbrain, especially after electrode CP6, and all the available electrodes in the brain increased. That means phase synchronization increased between the hindbrain regions and whole brain during the electrical-acupuncture about 15 minutes. It could be an evidence of regulating both the peripheral nervous system and central nervous system with stimulating these two points.

Two new 4-methyl-progesteroids, nodulisporisteriod A (1) and nodulisporisteriod B (2), were isolated from the extract of an endolichenic fungal strain Nodulisporium sp. (No. 65-17-2-1), along with two related metabolites, demethoxyviridin (3) and inoterpene B (4). Their structures were determined by detailed spectroscopic analyses, X-ray crystallographic analysis and comparison of the NMR data with those of the closely related compounds previously reported. Nodulisporisteriod A (1) and nodulisporisteriod B (2) possess new carbon skeletons, which are the first cases of fission at C-3,4 in 4-methyl-progesteroids. A hypothetical biosynthetic pathway for 1 and 2 was proposed. Moreover, the Aβ42 aggregation inhibitory activities of 1-4 were evaluated using standard thioflavin T (ThT) fluorescence assay with epigallocatechin gallate (EGCG) as positive control. Demethoxyviridin (3) displayed anti-Aβ42 aggregation activity with IC50 value of 13.4μM.

The solar optical collector based on rotary parabola mirror for solar optic fiber lighting is discussed in this paper. By this reflection method, the chromatic aberration can be avoided. The performance of solar collecting and fiber coupling are simulated by Tracepro software. The results showed this system can collecting soar lights with high efficiency and has high light concentration ratio. The solar lights can be coupled into optic fiber with low loss. An interesting results is found that the concentration ratio decreased with the increased curvature ratio between ellipsoid surface and parabola surface.

4 groupsconcrete columns specimens which have different eccentricityities were fabricated , The first specimen was just made of reinforced concrete. The second was enlaced with 3 lays carbon fiber reinforced polymer. The third had SFRCs added to it. The last was reinforced with SFRCs and enlaced with carbon fiber reinforced polymer.The results showed that the introduction of fibres as well as wrapping the specimens with FRP improve the strength of concrete,especially its ductility.

Base on a practical project, the site-test Research on s Capacity of Bonding Interface Between New and Old Concrete was carried out with three different disposal ways, which is Roughening ,slotting and planting bar. The test process and phenomenon were described, The conclusion is that Planting bar is a more effective way to improve the bearing capacity between the new and old concrete surface.

ZnS:Cl − nanoparticles with strong blue emission have been synthesized successfully by a solid-state reaction at low temperature. The dependence of photoluminescence (PL) properties of ZnS:Cl − nanoparticles on the Cl − contents was researched, and the influences of the annealing ambience and using polyvinyl alcohol (PVA) during the synthesis on the PL of ZnS:Cl − (Cl/Zn = 0.35) nanoparticles were discussed. X-ray power diffraction (XRD), X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), and ultraviolet-visible spectroscopy were used to characterize their structure, chemical state, diameter, surface states, and PL properties. The results showed that ZnS:Cl − nanoparticles had a cubic blende crystal structure and an average crystallite size of 17.40–19.16 nm. The most intensity blue emission peaking at about 425 nm was obtained when Cl/Zn = 0.35 under 330 nm excitation at room temperature. The emission intensity of ZnS:Cl − (Cl/Zn = 0.35) was increased 3-fold than that of ZnS. The results showed that the PL of ZnS:Cl − (Cl/Zn = 0.35) nanoparticles was enhanced after annealing or using PVA during the synthesis, and annealing in vacuum had a stronger effect in improving the luminescence properties of ZnS nanoparticles than in air. This work suggests that it is an effective method to improve the PL intensity of ZnS nanocrystals by doping with Cl − in ZnS.

Cl − -doped ZnS (ZnS:Cl − ) nanoparticles with strong blue emission were synthesized using a facile low temperature solid state reaction method. X-ray powder diffraction, scanning electron microscopy, UV–vis absorption, and X-ray photoelectron spectroscopy were used to characterize their crystal structures, microstructural characteristics, and chemical compositions, respectively. The ZnS:Cl − nanoparticles were quasi-spherical in shape and had a cubic zincblende crystal structure. Cl − doping was found to lead to a reduction in the crystallite size of the ZnS:Cl − nanoparticles. It showed that Cl − doping remarkably enhanced the luminescence properties of the ZnS:Cl − nanoparticles, and an optimal Cl − doping condition was determined. Post annealing was found to further improve the luminescence properties of the ZnS:Cl − nanoparticles. The effect of post annealing temperature on the luminescence properties of the ZnS:Cl − nanoparticles was systematically studied and discussed.

Xinshengin (1), the first tetracyclic altenusin with an unprecedented altenuene/tetrahydrofuran-fused skeleton core, has been obtained from cultures of an endolichenic fungal strain Phialophora spp. (No. 39-1-5-1), along with a new compound, phialophoriol (2), and a known compound, altenusin (3). The structures with absolute configurations of 1 and 2 were elucidated by analysis of NMR and quantum chemical ECD calculation. (C) 2013 Elsevier Ltd. All rights reserved.

The toluene soluble (TS) fraction prepared from a middle-temperature coal tar pitch was subjected to a series of thermal treatments at the various temperatures from 410 °C to 470 °C for different periods of time. The samples obtained after heat treatment was quenched to ambient temperature. Mesophase spheres were separated from the quenched samples using washing oil and quinoline. The kinetics of mesophase sphere formation of the TS fraction was studied, based on the data derived from the time-dependent changes in the mesophase sphere content. It was clarified that the mesophase sphere formation of TS fraction was an autocatalytic type reaction. The rate law and the rate constants for the mesophase sphere formation at holding temperatures of 410°C, 430°C, 450°C and 470°C were determined. The rate constants of the mesophase sphere formation follow the Arrhenius equation. The Arrhenius parameters of the mesophase sphere formation are 200.2 kJ mol-1 of the activation energy and 2.71x1012 % -1 h-1 of the pre-exponential factor. The treatment temperature had a greater effect on the formation of mesophase spheres than the treatment time.

The pressure responding theoretical models are got for two intrinsic Fabry-Perot interferometric fiber pressure sensors fabricated by single mode and multimode fibers with different diameters. The pressure response curves are simulated by Matlab programs. The analysis showed that the sensitivity changing situation is different for two structures. The big size structure has a critical point of sensitivity. Higher sensitivity can be got by two structures, but the small size structure is more attractive than the big size structure.

The theoretical model is got for a new intrinsic Fabry-Perot interferometric fiber pressure sensor structure fabricated by single mode and multimode fibers with different diameters. The pressure response curves are simulated by Matlab software. The analysis results showed that the pressure sensitivity decreased with the diameter of multimode fiber increased at some area, but the sensitivity begins to increase when the diameter value is more than critical point. The high sensitivity can be still got by increasing fiber diameter.

O2−-doped ZnS(ZnS:O) nanoparticles with strong blue emission were successfully synthesized using a facile low temperature solid state reaction method. X-ray powder diffraction, scanning electron microscopy, and transmission electron microscopy were used to characterize their crystal structures, sizes, morphologies, and photoluminescence. The ZnS:O nanoparticles were quasi-spherical particles with a cubic zincblende crystal structure, and their average crystallite diameter was about 8.35–13.50 nm. Dependence of the photoluminescence properties of the ZnS:O nanoparticles on the Zn/O ratio in the source materials was studied, and an optimal O2− doping condition was found to be Zn/O=10:5.3. The ZnS:O (Zn/O=10:5.3) nanoparticles exhibited strong blue emission with an intensity 9 times higher than the undoped nanoparticles.

Two kinds of exfoliated graphite have been prepared from graphite flake and graphite powder, and their preparation conditions were respectively optimized by orthogonal experiments and parallel experiments. The effect of graphite size on the characteristics of exfoliated graphite was researched. The microstructure of two kinds of exfoliated graphite was measured by SEM. The results show that the optimal preparation conditions for exfoliated graphite flake are as following: the mass-volume ratio of graphite to mixed acid is 1: 4, the volume ratio of nitric acid to phosphoric acid is 1: 2, the mass ratio of graphite to potassium permanganate is 1: 0.1, and the reaction temperature is 25°C. For exfoliated graphite powder, the optimal mass ratio of graphite powder to potassium permanganate is 1: 0.22, and the consumption of oxidant for exfoliated graphite powder is more than that for exfoliated graphite flake. The longitudinal expansion of graphite flake is more apparent than that of graphite powder and leads to a worm-like fluffy rope.

This paper mainly introduces FlexRay, a high speed, real-time and high reliability bus technology, and researches network topology structure and network communication protocol of FlexRay bus. Then this paper points out that the premise of analyzing FlexRay protocol is catching the bus data transmission, and designs a data acquisition and analysis system with FreeMASTER software and Tektronix TDS3012B digital phosphor oscilloscope. In order to verify the accuracy of the software FlexRay interface design, this paper also describes the analysis and verification procedure of the timing sequence of FlexRay bus. Lastly, this paper reminds of the application prospect of this system.

According to the characteristics of compacted snow-ice, the formation types and microstructure of compacted snow-ice were analyzed to know the snow clearing performance and rule and laid the theoretical foundation for related design of snow clearing equipment. In addition, the microscopic snow clearing performance, physical and mechanical properties were described and further research was proposed, which have provided a scientific basis for technology research and equipment development in the field of snow clearing.

Taking the patent literature in the field of the 3G mobile communication in Derwent Innovation Index (DII) as the research object, this paper utilizes CiteSpace and Σ index to conduct analysis on key technologies of technical evolution in the 3G mobile communication system. Then, the key technologies from 1994 to 2009 are separated into four periods. Next, interpretations are formulated to study these key technologies represented by Derwent manual codes. Finally, this paper illustrates the key technologies and their main evolutional paths in different periods.

Exhaust system is the most important infrared radiation source of a long-endurance UAV and the shape of the nozzle contribute to the infrared radiation characteristics of exhaust system. This paper built a 2-D nozzle and use ANSYS14.5 simulated the temperature filed of the plume. And then, spectral infrared radiation characteristics of the plume were obtained by the single band C-G approximation method. Finally, the infrared radiation intensity distribution of the exhaust system of the 2-D nozzle in different planes is obtained. The results show: The infrared radiation of the plume in wide side detection surface is far greater than the narrow side; The infrared radiation of the nozzle in wide side detection surface is smaller than the narrow side; The infrared radiation of the exhaust system in wide side detection surface is smaller than the narrow side. The results maybe contribute to the further study of the infrared radiation characteristics of the long-endurance UAV.

The aim of this study was to investigate the effects of different oils on growth performance of juvenile Anguilla marmorata. Five isonitrogenous and isoenergetic experimental diets were formulated to contain fish oil (FO), sunflower oil (SFO), peanut oil (PO), corn oil (CO) and soybean oil (SBO), respectively, as lipid sources each at an inclusion level of 50 g/kg. The diets were fed to apparent satiation for 10 weeks, twice a day to triplicate tanks of 30 fish each with an initial body weight 6.00±0.06 g. Weight gain (WG) and specific growth rate (SGR) of fish fed the FO and SBO diets were markedly higher than those fed the CO diet, while no other difference in WG and SGR were observed among other treatments. Fish fed FO and SBO diets had better feed utilization than the other diet fish groups. Muscle of fish fed the FO diet had significantly higher levels of C20:5n-3 and n-3/n-6 ratio compared with fish fed vegetable oil (VO) diets, while muscle n-6 PUFA and C18:2n-6 content showed an opposite trend. The present results suggest that soybean oil is a suitable replacement for fish oil for Anguilla marmorata. The IJA appears exclusively as a peer-reviewed on-line open-access journal at http://www.siamb.org.il. To read papers free of charge, please register online at registration form. Sale of IJA papers is strictly forbidden.

Thermo-mechanical experiments were carried out to study the effect of deformation speed and temperature on the behaviour of a non-quenched and tempered steel during hot forging. And an effective method for correction of friction was used to amend the tested flow stress, Meanwhile, the constitutive equations of flow stress-strain for TL1438 steel during hot forming was established based on the amended flow stress and hyperbolic sine which includes Zener-Hollomon parameter, and related parameters of TL1438 during hot forming was obtained by analyzing the data.

The current study was to investigate whether embryo or fetal fibroblast cells treated with 5-aza-2’-deoxyctidine (5-aza-dC) have a positive effect on the in vitro development of porcine parthenogenetic and cloned embryos. To this end, porcine fetal fibroblast cells were treated with different concentrations (5 nM, 50 nM and 500 nM) of 5-aza-dC for different exposure times (1, 6 and 20 hours), the results showed that DNA methylation in PRE-1 SINE region was gradually reduced over time in cells treated with 5-aza-dC. To determine the effect of 5-aza-dC on in vitro development of porcine activated oocytes, the parthenogenetic embryo was treated with 5-aza- dC. Notably, treatment with 5 nM 5-aza-dC for 1 hour led to a significant improvement in blastocyst development, compared with the control group. The effects of donor cell treatment with 5-aza-dC on porcine cloned embryos development were further examined by treating fetal fibroblast cells with various concentrations (5 nM, 50 nM and 500 nM) of 5-aza-dC for different exposure times (1, 6 and 20 hours). Exposure of cells in 5 nM 5-aza-dC for 1 - 20 hours led to a significant improvement in the percentage of developed blastocysts, while treatment with 500 nM 5-aza-dC did not affect blastocyst development, compared to untreated controls. These findings indicate that treatment of fetal fibro-blast cells with relatively low concentrations of 5-aza-dC for short exposure times improves subsequent blastocyst development of porcine cloned embryos.

Intracytoplasmic sperm injection (ICSI) has been considered one of the strong assisted reproductive technologies for producing transgenic animals as well as treating infertility in animals and humans. However, in porcine ICSI, embryos produced by in vitro methods show low pregnancy rates with high abnormal offspring and blastocyst formation rate as well as quality are poor compared with those in other species. For these reasons, developing a protocol for porcine ICSI is essential to efficiently generate transgenic pigs. Since amino acids were introduced to embryo development because of their beneficial effects, many embryologists have been using nonessential amino acid (NEAA) in culture medium for embryonic development in pig and other species. Leptin also has been shown to be beneficial in embryonic development for increasing rate of cleavage and blastocyst development. However, the effects of NEAA and leptin were not fully understood in the development of porcine ICSI-derived embryos. Here we investigated the optimization of NEAA and leptin supplementation in culture medium to improve developmental competence and quality of preimplantation embryos after ICSI in pig. The proportion of embryos that developed to the blastocyst stage was significantly greater when 1% vol/vol NEAA (24.6%) or 100 ng/mL leptin (27.1%) was supplemented in the culture medium compared with other concentrations or no supplement. When NEAA and leptin (24.8%) were supplemented together, blastocyst formation was significantly higher than other single supplementation groups. We also evaluated the effects of different supplementation periods of NEAA or leptin on the preimplantation embryonic development after ICSI. Both NEAA and leptin showed that supplementation for the entire 7 days significantly increased the blastocyst formation rate compared with the other groups of supplementation for the first 4 days and for the subsequent 3 days. A second goal of our research was to evaluate the quality of developed blastocysts after ICSI. The supplementation of 100 ng/mL leptin in culture medium made blastocysts express less of the proapoptosis genes BAX and BAK and more of the antiapoptosis genes BCL-XL and BCL-2 after the ICSI procedure. Furthermore, terminal deoxynucleotidyl transferase dUTP nick end labeling index, fragmentation, and total apoptosis were significantly decreased and the total cell number was significantly increased when the ICSI-derived embryos were cultured to blastocyst stage in the presence of the combination of NEAA and leptin. These results suggest that NEAA and leptin could improve not only the quantity but also quality of ICSI-derived porcine embryos during in vitro culture with the optimal concentration of each reagent.

Plume is the main infrared source of a long-endurance UAV, and its infrared radiation numerical calculation is very important for calculating the infrared characteristcs of the whole UAV. This paper built the geometrical model of the flow field structure of UAV plume by analyzing the characteristcs of the flow structure. And, The temperaturre field distribution of the UAV plume was calculated based on the eddy current propagation theory. And then, spectral infrared radiation characteristics of the UAV plume at 2-5μm were obtained by the single band C-G approximation method. The results show that the temperature in the core area of the UAV plume is higher , and the infared radiation characteristics are stable and obvious. The infrared radiation energy of the plume mainly ditributed at the infrared wavelength of 2.7μm and 4.5μm,which is in accordance with the actual situation. The results maybe contribute to the further study of the infrared radiation characteristics of the long-endurance UAV.

Eight new isocoumarin glycosides (1-8) were obtained from the solid culture of the wetland soil-derived fungus Metarhizium anisopliae (No. DTH12-10). Their chemical structures were elucidated by analyses of HR ESI-TOF MS, (1)H, (13)C NMR, (1)H-(1)H COSY, HSQC, and HMBC spectra. The absolute configurations were determined by single crystal X-ray diffraction, circular dichroism (CD) spectrum, and chemical derivatization methods. In addition, inhibition of the biofilm formation and the secretion of virulence factor of the new isocoumarin glycosides against Pseudomonas aeruginosa strain PAOA (clinical isolates) were evaluated. The result revealed that compound 1 showed antibacterial activity comparable with (Z)-4-bromo-5-(bromomethylene)-2(5H)-furanone (BF).

This paper firstly introduces the basic information of CAN bus and the general method of CAN testing and points out that application layer protocol is hard to test. Secondly, this paper adapts the method of capturing, analyzing, constructing and sending CAN bus data packet to analyze certain oil system software interface protocol. Then, this paper proves this method can be usde to test the accuracy of the software interface and conduct the further software interface testing.At last,this paper points out the application suggest of this method.

Chemical investigation on an endolichenic fungal strain Scopulariopsis sp. led to the isolation of two new naphthalene derivatives, 1-(4'-hydroxy-3',5'-dimethoxy-phenyl)-1,8-dimethoxynaphthalen-2(1H)-one (1) and 1,8-dimethoxynaphthalen-2-ol (2). Their structures were determined by spectroscopic techniques (UV, IR, MS, 1D, and 2D NMR).

In order to lessen the worsened formability, failures and fractures occurring in the cold stamping process, the hot stamping technology was adopted in the forming of DP steel engine dumping plank. The simulation technology of finite element method was also used to forecast the forming defects in the stamping process of the DP steel engine dumping plank. In the paper, the forming limit, the influences of stamping gaps and the influences of different blank holder force on the stamping part were analyzed by using eta/DYNAFORM software. Meanwhile, the thickness changes and the materials flow conditions of the DP plank during the hot stamping process were also analyzed. Through the experimental analysis, the result of the finite element numerical simulation complied very well with that of actual production results. The research results show that duplex steel plate can meet the performance requirements of car engine dumping plank forming, which offers theory basis for the production of similar parts.

Non-Newtonian fluids such as blood, colloids, and cell suspensions are often manipulated in microfluidic devices and exhibit extraordinary flow behaviors, not existing in Newtonian fluids. This paper represents an analytical solution of transient velocity for electroosmotic flow of generalized Maxwell fluids through both a micro-parallel channel and a microtube, using the method of Laplace transform. The solution involves analytically solving the linearlized Poisson–Boltzmann equation, together with the Cauchy momentum equation and the general Maxwell constitutive equation. By numerical computations, the influence of normalized relaxation time on transient EOF velocity is investigated for different parametric values.

Three new azaphilones, chaetomugilin S (1), 7,5'-bis-epi-chaetoviridin A (2), and 7-epi-chaetoviridin E (3), and two new chlorinated phenolic glycosides, globosumoside A (4) and globosumoside B (5), were isolated from the crude extract of the fungal strain Chaetomium elatum No. 89-1-3-1. Their structures were determined by detailed NMR and MS spectroscopic analyses. The absolute configurations of C-7 in chaetomugilin S (1), 7,5'-bis-epi-chaetoviridin A (2), and 7-epi-chaetoviridin E (3) were assigned by CD experiments, and the absolute configurations of 1 and 2 were established by X-ray crystallography. Compounds 1-3 are the first examples of 7R-configurated azaphilones with a chlorinated isochromen from Chaetomium spp. In addition, compounds 1-3 showed inhibitory activity in the cysteine aspartyl-specific protease-3 (caspase-3) enzymatic assay, with IC₅₀ values of 20.6, 10.9, and 7.9 µM, respectively.

Molecular crowding is a new approach to promoting molecular imprinting more efficiently. In this work, this concept was applied to the preparation of imprinted monoliths in the presence of molecular crowding agent for stabilizing binding sites and improving molecular recognition. The imprinted monolithic column was synthesized using a mixture of enrofloxacin (template), methacrylic acid, ethylene glycol dimethacrylate, and polystyrene (molecular crowding agent). Some polymerization factors, such as template-monomer molar ratio and the composition of the porogen, on the imprinting effect of resulting MIP monolith were systematically investigated. Moreover, a stoichiometric displacement model for retention was successfully applied to evaluate the interaction between the solute and the stationary phase. Compared with the MIP prepared by conventional polymerization, the molecular crowding-based monolithic MIPs showed higher selectivity. The results suggested that molecular crowding is a powerful strategy to increase the effect of molecular imprinting.

According to the similar characteristics of structure, geometry and constraints conditions in the same type of extrusion process, the intelligent design system of a square tube aluminum profile extrusion forming process was established in this paper based on the VB programming language, with using parametric programming language APDL provides by ANSYS software. The parameterized optimization design plan of pre-treatment and post-processing of ANSYS analysis during a square tube aluminum extrusion forming process was achieved, and the program of a three-dimensional model of the extrusion die under Visual Lisp environment was also programmed. The human-computer interaction intelligent design system which combined with pre-processing of semi-finished product, finite element analysis of extrusion die strength, extrusion die temperature field analysis, structural optimization of the die was realized. The research results show that the system can provide program decision-making, structural design, performance analysis and graphics treatment for the actual extrusion productions of square tube aluminum extrusion process, which reduced the design time of the technical staff, and saved design cost.

The orientation of the hydrocarbon chains and functionally important chromophore of copper (II) phthalocyanine (CuPc) derivatives are discussed by spectrum assessment methods in ordered thin films. The attention is focused upon the monolayer and multilayer films of CuPc derivatives that are symmetrically and asymmetrically substituted CuPc biosimulation systems. On the basis of infrared (IR) transmission, polarized IR, reflection–absorption (RA) IR spectroscopy and surface enhancement resonance Raman spectra (SERRS) study, following conclusions are given. The hydrocarbon chains of CuPc in the film are in hexagonal or pseudohexagonal subcell packing, and the CH2 asymmetric vibrational vector is oriented with respect to the substrate surface. The macrocycle of CuPc on the Ag substrate is oriented parallel to the surface, and the RA spectroscopy can distinguish the two CH2 stretching modes of benzene cycle. All these studies and results are useful to provide an insight into the nanostructure of the thin films of other kinds of compounds.

In this work, we investigated the influence of annealing on the crystallinity, microstructures, and photoluminescence (PL) properties of ZnO nanoparticles prepared by sol–gel method. The annealing was carried out both in air and vacuum. X-ray powder diffraction, scanning electron microscopy, and ultraviolet–visible spectroscopy were used to characterize the crystal structures, diameter, surface morphology, and PL properties of ZnO nanoparticles. It has been found that both the as-grown and annealed ZnO nanoparticles had a hexagonal wurtzite crystal structure, and their average diameter and crystallinity increased with the anneal time and temperature. Pure blue-emitting behavior was observed in all samples. The emission intensity of ZnO nanoparticles was found to be enhanced after annealing, but it was highly dependent on the annealing conditions. Optimal annealing conditions both in air and vacuum were obtained for achieving maximum emission intensity in the ZnO nanoparticles. The dependence of PL properties of the ZnO nanoparticles on the annealing conditions was discussed.

In this work, molecular crowding agent was first applied to the preparation of molecularly imprinted polymer (MIP)-based drug release system. With S-naproxen as template, the MIPs were prepared with methacrylic acid and ethylene glycol dimethacrylate, in the presence of polystyrene as molecular crowding by precipitation polymerization. Morphology and particle size of the resulting MIP sub-micrometer microparticles were determined by scanning electron microcopy and dynamic light scattering. The influence of several parameters on the sustained release of the imprinted polymers was investigated, including the molar ratio of the imprint molecule to the functional monomers, the molar ratio of the functional monomers to the crosslinking monomers, and the type of the porogen. In addition, the release of the MIP was compared to that of the traditionally prepared imprinted polymers with other porogens. The transport mechanism of template was studied by fitting experiment data with different model equations and calculating the corresponding parameters. The novel MIPs prepared with molecular crowding were able to prolong S-naproxen, in a phosphate buffers solution of pH 7.4, for more than 12 h, indicating better sustained release effect than that prepared with noncrowding agent. POLYM. ENG. SCI., 2012. © 2012 Society of Plastics Engineers

A QI-free coal tar pitch prepared by solvent extraction from a soft coal tar pitch was subjected to a series of thermal treatments at a predetermined temperature for different holding times. The development of mesophase was discussed in terms of its size and content in the heat-treated pitches. Results showed that the size and yield of the dispersed mesophase spheres in the isotropic matrix strongly depended on the holding temperatures. When the holding temperature was less than 400 °C, only a few of small spheres formed in the mesophase pitches. However, when the holding temperature was over 420 °C, the diameter and yield of mesophase spheres in the heat-treatment pitches increased progressively with increase of the holding time. Treatment at 440 °C for 4h led to 19.9 % of the yield and the average sphere radius was 4.5-100 . In the SEM photograph of mesocarbon microbeads obtained from the heat-treated pitches using soxhlet extraction. Many small flaky particles and sporadic rugby ball-shaped particles were observed as well as a large number of spherical particles.

Zn 1− x Mg x S (0 ≤ x ≤ 0.55) quantum dots (QDs) were successfully synthesized by precipitation method. The crystal structures, microstructures, and optical properties of the Zn 1− x Mg x S QDs were investigated using X-ray diffraction, scanning electron microscopy, and ultraviolet-visible and photoluminescence (PL) spectroscopy. The Zn 1− x Mg x S QDs were found to have a cubic crystal structure and an average crystallite size of 6.40–7.96 nm. It has been shown that an increase in doping Mg 2+ concentration in Zn 1− x Mg x S QDs led to a gradual widening of the band gap and a weakening in the PL intensity of the Zn 1− x Mg x S QDs.

12 RC columns specimens are divided 4 groups which have different eccentricities. Each group has 4 specimens, The first specimen was just made of reinforced concrete. The second was wrapped with 3 lays CFRP. The third had steel fibres added to it. The last was reinforced with steel fibres and wrapped with CFRP.The results showed that the introduction of fibres as well as wrapping the specimens with FRP improve the strength of concrete,especially its ductility.

In order to study small size three dimensional shape processing of electro jet machining, the micro-channel principle is introduced firstly. Moreover, narrow groove processing experiment design and construction process is described, and experimental purpose is to change the cycle times to research the rule of groove width and depth. The experimental results indicate that when the width of the groove reaches a certain value, it will be stabilized and fluctuate around the value. However, with the increasing of the cycle number, groove depth increases. If cycle times are less than 7, the overall shape of the groove is a part of an approximate ellipse, otherwise it is changed but the bottom shape of the groove is still a part of an approximate ellipse.

In order to change surface morphology and contact angle of part, abrasive jet method is discussed in the paper. Glass, steel and titanium are used to study its surface morphology by the processing of abrasive to jet the surface. In addition, the extent of its impact of processing method is studied with different abrasive size. Experiment method and environment are also introduced, and experiment shows that contact angle of glass changes from 14.9° to 93.8° (Titanium and steel also have different degrees of diversification). According to experiment of the method, abrasive jet methods affects contact angle, and it has the value of further research.

An experimental system used for temperature measurement is designed by the K-type thermocouple thermometry to achieve a direct measurement of cutting temperature in high speed orthogonal turning. The general regularity of temperature distribution is concluded, and the corresponding influences of cutting speed and cutting depth on the maximum temperature value are discussed in detail. Experimental data and simulating results are comparative analyzed to demonstrate the feasibility and correctness of Finite Element Method (FEM) model simulation and analytical solution. The verified model of temperature field can be applied to develop an effective non-contact soft-sensing method for high speed cutting temperature.

ZnO quantum dots (QDs) with strong blue emission have been successfully synthesized by sol–gel method, and their crystal structures, sizes, and photoluminescence properties were characterized by X-ray diffractometer, scanning electron microscope, and ultraviolet–visible spectroscopy. It has been found that ZnO QDs had a hexagonal wurtzite crystal structure, and their average diameter was about 16.0–32.2 nm. Both the reaction time and temperature were found to have a strong influence on the average size and photoluminescence properties of ZnO QDs. Longer reaction time and higher reaction temperature resulted in larger average size for ZnO QDs. It has been shown that at reaction temperature 60 °C the emission intensity for ZnO QDs increased first with reaction time before 7 h and then decreased after 7 h. For the same reaction time 7 h, ZnO QDs synthesized at 60 °C showed the strongest emission intensity. It was found that annealing in nitrogen, vacuum, and air all resulted in an increase of the size of ZnO QDs and a reduction in their photoluminescence. The dependence of the size and properties of ZnO QDs on the reaction parameters as well as the annealing conditions has been discussed.