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Wave-absorbing coating samples are fabricated with ZnO whisker, the absorbent and silicon resin coating as the binder.The influences of the content of ZnO whisker in the absorbing coating and the thickness of the coating on millimeter wave absorbing property are analyzed.With the increasing of the thickness, the absorbing performance of the sample is enhanced significantly , the results show that with a ZnO whisker mass of 50% and coating thickness of 2 mm, excellent absorption (R

The printing machine is a sort of large-scale equipment characterized by high speed and precision. A fault diagnosis method based on kernel principal component analysis (KPCA) and K-means clustering is developed to classify the types of feeding fault. The multidimensional and nonlinear data of printed image could be reduced by KPCA to make up the deficiency of the traditional K-means clustering method. In this paper, it is experimentally verified that the classification accuracy of the combined method is higher than the traditional clustering analysis method in feeding fault detection and diagnosis. This method provides a shortcut for the determination of fault sources and realizes multi-faults diagnosis of printing machinery efficiently

As an important application area of field-bus system, UPS require high reliability and real-time property. Standard CAN protocol in application layer have not been proposed in home and abroad. Based on CAN-bus 2.0 A/B, this paper designed UPS-CAN protocol which conform to general UPS parallel system and proposed a novel network management system (MSN) during development of module UPS parallel system. Experimental results proved the reliability and real-time property of UPS-CAN which meets the requirement of UPS parallel communication system.

The interfacial tension (IFT) and contact angles of different oil/solutions were compared to unveil the influence of Mg2+on oil/NaOH interfacial properties. The results demonstrate that adding Mg2+to NaOH solution cannot change the oil/NaOH interfacial tension when enough OH-is provided. While for NaOH-surfactant solution, adding Mg2+changes the IFT dramatically. Adding NaOH to oil/water produces a minimal contact angle at NaOH of 0.02wt%. Adding surfactant or MgCl2alone increases the contact angles. Adding them together produces a synergism to bringing down contact angles gradually with the increase of NaOH concentration. The change of salinity and the reaction among them may be responsible for the influence and synergism.

Possible ways to remove fluoride from phosphoric acid are extraction,but there are always generated a second organic phase ,where still have small amounts of impurities such as fluoride,sulfate,iron,aluminum and heavy metals. The traditional process using pure water or dilute phosphoric acid washing the organic phase to get phosphoric acid ,but the impurities removing rate is not obvious.This study explore a new way to changes the washing detergent,using dilute alkali solution to reduce fluoride content of stripping in phosphoric acid.The optimization of experimental conditions is dilute alkali mass fraction 20%,dosage 0.4%,temperature 45°C,the defluorization rate can be 67.75% and phosphorus pentoxide yield rise to 95.50%.This study provides a new idea to improve defluorination rate in industrial production.

K/S value is an important parameter of modern colorimetry, which can indicate the depth of the color of dyed fabric surface. Measurement of K/S value is easily and simple operation in the applied engineering. Take Reactive Blue B-2GLN as examples in this paper, the relationship between K/S value and the fixing rate with the reactive dyes on cotton fabric was studied. And the feasibility of K/S value instead of the traditional washing method for the determination of reactive dyes fixation rate was also studied. The results show that: the K/S value of the fabric has good linear relationship to the reactive dyes fixation rate by the washing method and the reactive dyes fixation rate can be get from the K/S correction value.

The surface modification process for cotton fabric which was oxidized first, and then crosslinked with collagen was studied. The optimum oxidation process was as follows: concentration of sodium periodate 0.6g/L, time 2.5h, temperature 40°C, ratio of water and cotton fabric was 100:1. The method for surface modification of cotton fabric was determined from comparative analysis, and the optimum process: collagen solution concentration 6%, glutaraldehyde concentration 5%, reaction 40min at 30°C, ratio of water and cotton fabric was 100:1. Compared with original cotton fabric,the breaking strength and elongation of collagen modified cotton fabric decreased, while the dyeing percentage with acid dyes was increased and this means the surface of modified cotton fabric was covered with a large component of collagen.

Preparing of cool wool natural energy storage materials from wool fiber is a feasible and effective method. The structure characteristics of wool and the reason that wool has cool properties were introduced. The preparation principle, preparation methods and properties of cool wool fiber was studied. The preparation methods of cool wool mainly include scale stripping and surface coating. Scale stripping mainly consists of Chlorination, oxidation, biological enzyme treatment and plasma treatment. Surface coating mainly consists of resin finishing and ceramic finishing. Slenderizing and adding energy storage materials are also the effective methods. Wool as a new concept of natural energy storage material is recognized by people.

The statistical histogram algorithm is one of the common background update algorithms. Considering the statistical histogram algorithm disadvantages of large complex computation, the paper proposes an improved method named fixed window statistical background updating algorithm. The algorithm sets a window which contains N records for each pixel point firstly, every record records value in the permissible range of error and the number of pixel point occurrence, and then counting pixel values for every record through statistical histogram algorithm. When the window is full, the new pixel values will replace the smaller counting, while the pixel which counting larger will be adaptively updated by adaptive background updating formula. The experimental result shows that this method has a high real-time performance and robustness in background updating.

After the construction project evaluation and implementation of the entire project an indispensable part of the process, and establish a sound, scientific index system for the scientific evaluation of the results obtained have a pivotal role in the project. This paper discusses the method of establishing evaluation system after construction projects, and gives a more scientific and comprehensive indicator system: After the implementation and management, project operations conducted from four economic projects, project evaluation and analysis of the impact and sustainability of projects establish the sub-indices, including duration of the project, project quality, with a total investment control, project profitability, solvency, environmental impact, economic impact, social impact, policies and projects for sustainable development and social factors, financial factors, social factors, a number of technical factors. Each sub-index and a scientific decomposition.

The accuracy of the results of the evaluation after the construction project is largely dependent on the choice of the evaluation method is reasonable and scientific. In this paper, the current methods for the evaluation of projects for a more systematic study were compared and analyzed; and proposed the construction of the factor analysis method for the analysis of project evaluation, and gives two reasons for the application of this method .

Polyvinylpyrrolidone (PVP) has been used to control size and shape of metal nanoparticles in aqueous solution, where PVP plays the dual role of protective and reducing agent. The influence of PVP with different molecular weight on the aspect ratio of nanorods and nanowires during a classical polyol process was studied. Nanowires with higher aspect ratio were obtained by using PVP with higher molecular weight. It is suggested that the reduction rate is decreased with an increase of the molecular weight of PVP, leading to the growth of nanowires with higher aspect ratio.

A simple, rapid and accurate method for the determination of fluoride in Antarctic krill has been developed. The fluoride content in Antarctic krill was determined by ion chromatography. The method requires a simple sample clean-up procedure to remove the interfering Cl- from the hydrochloric acid extraction solution. The optimum extraction conditions of fluoride from Antarctic krill samples were obtained by adding 8mL of 1:11(v/v) hydrochloric acid solution and extracting for 60 min. Under these conditions, recoveries of fluoride from Euphausia superba and Penaeus vannamei were 97.9-105.6% and 95.1-101.9%, respectively. The limit of detection was 0.01mg/kg. The method was applied to the determination of fluoride in Antarctic krill. Key words: Fluoride, Antarctic krill, Ion chromatography

To more accurately learn reliability on anti-overturning stability for a truck crane, a parametric multi-body dynamics model is built in a dynamic software environment with overall key parameters as design variables. On this basis, stability criteria of this truck crane are established according to the working conditions and crane dynamics simulation results. After a truncated normal distribution sampling method is given for design variables which will effect on truck crane's stability, the reliability analysis of this truck crane is done via Monte Carlo method. The result indicates that the truck crane's stability reliability is 0.9998 in the most dangerous working condition. Analysis shows that the reliability calculation of truck crane anti-overturning stability is feasible using modern multi-body dynamics and Monte Carlo method, and the results are more accurate than conventional safety factor method.

shaftless driving is a kind of advanced and new drive way which can solve the high precision of printing synchronism, mainly used in gravure printing, soft printing and wheel transformation printing equipment but less used in sheet-fed offset press at present. Based on sheet-fed offset press as the research object, the author analyzed the transmission characteristics of sheet-fed offset press, designs a scheme of shaftless driving used in sheet-fed offset press and set up the hardware and software platform, verified the scheme by experiments.

Wheat protein composite fiber is a kind of new regenerated cellulose fiber containing protein utilization of wheat bran prepared. The fundamental characteristics of wheat protein composite fiber were studied. The results show that the dry fracture strength is 2.03 cN/dtex and it is lower than that of viscose fiber. It has high moisture regain and low fracture strength and the moisture regain of the fiber is 12.23%. The whiteness of wheat protein composite fiber is lower than viscose fiber. The combustion performance of wheat protein composite fiber is similar to viscose fiber. Compared with wool, the combustion performance is easy. Dyeing properties of the fiber with reactive dyes is excellent and the goods have bright color and good color fastness. The dyeing percentage of direct dyes reached to 90%. The wheat protein composite fiber product is deeply liked by people with its good wearing property, and extensively applied to wear base material with its fine affinity.

The gene encoding an endo-β-1,4-xylanase (XynCC) fromchaetomium cupreumwas amplified using PCR. The nucleotide sequence of a 690 bp cDNA fragment was determined. Based on the nucleotide sequence, calculated molecular mass of the enzyme was 24.7 kDa. The XynCC gene was inserted into the pYES2 vector and transferred into the cells ofS. cerevisiaeH158 for heterologous expression.

This paper discusses a firms performance of proactive environmental technology innovation strategy and reactive strategy based on the model. It is proved that a firm can get better payoff if the manager interpret environmental issues as opportunities, comparing the performance of achieving these two strategies. A firm can profit under better communications with the public by managerial interpretations of environmental issues as opportunities trading off the increasing costs. In conclusion, the shareholder should motivate the manager to interpret environmental issues as opportunities for better payoff.

With the rapid development of global electricity, our country has to study the smart grid in the background of the global development. We study the innovation of smart grid based on the engineering theory of service, and hope to provide a reference for smart grid research and the future development of the grid. Therefore, our country can adapt to the future development direction of the global market and service economy led.

Provided by ALTERA FPGA/CPLD Quartus II development software development platform. programmable timer/counter 8253s functions and internal circuitry as the basis, combined with programmable gate array (FPGA) products FLEX10KE characteristics, using VHDL hardware description language and schematic Figure two ways 8253 for hierarchical, modular, parameterized logic design. The completed design will be configured to the chip of FLEX10KE,and Proved to be correct.

Preparing of cool wool from coarse wool fiber is a feasible and effective method. The preparation principle, process and properties of cool wool fiber was studied during chlorination treatment with sodium hypochlorite. The optimum chlorination treatment process was as follows: concentration of sodium hypochlorite at 4g/L, concentration of sulphuric acid at 20g/L, time 15min, temperature 20°C to 25°C, ratio of water and wool fiber was 50:1. Compared with original wool fiber,the surface of cool wool only retained scales roots and the cuticle becomes thinner. Handle, softness, whiteness, luster and the anti-shrinkage properties were improved, the breaking strength is decreased about 5% to 8%.

The engineering construction item has a period to grow, the complicated degree is big, invest a great etc. characteristics.Many risk factors exist in the process of the engineering Construction. It will influence engineering item smoothly progress If can not effectively work well to guard against in time. Therefore, it have important meaning to strengthen a construction engineering risk management work. This text will carry on certain analysis to each risk factor of construction engineering item, and inquire into further how science, effectively strengthen a construction engineering risk management to work, then promise engineering item construction smoothly progress.

The surface modification process for coarse wool fiber which was oxidized by KMnO4 first, and then MnO2 covering on the fiber was reduced with Na2SO3 was studied. The method for surface modification of coarse wool fiber was determined from comparative analysis, the optimum oxidation process was as follows: concentration of KMnO4 at 3g/L, time 15min, temperature 50°C, ratio of water and wool fiber was 50:1, and the optimum reduction process: Na2SO3 concentration at 20g/L, time 8min, temperature 55°C, ratio of water and wool fiber was 50:1. Compared with original wool fiber,the breaking strength and fineness of modified coarse wool fiber decreased, while the moisture regain increased from 15% to 18%.

Dating and tracing young groundwater with sulfur hexafluoride (SF6) is a new technology developed several years ago. To study the origin, evolution of shallow groundwater in the core area of Daqing Oilfield, and to analysis the relationship between groundwater migration and groundwater vulnerability, the age of shallow groundwater was calculated using SF6dating technology. The result shows that, (1) the SF6age can indicate groundwater flow conditions of research area, (2) the general trend of SF6age is getting old from the north to the south, (3) the SF6age of most areas is good consistent to the groundwater vulnerability.

In order to simulate the dynamic trends of the influencing factors of water resources gap and periodic characteristics of the related factors, this paper establishes regional transition model and Error Correct Model as well as state-space model, whose parameters are used to measure the influences and trends. Empirical results implicit that these models fit sample data very well and some useful conclusions can be drawn from these parameters estimation. Different functions of influencing factors between periods of short and adequacy of water supply are showed. It is necessary to arrange consumption use rationally because of its greater percentage when water was scarce. The increasing consumption use becomes the main factor of water shortage.

Gunpowder was released in an instant when the pill fly out of the shell during the firing, and then formed a complicated flow fields about the muzzle when the gas expanded sharply. Using the 2 d axisymmetric Navier-Stokes equation combined with single equation turbulent model to conduct the numerical simulation of the process of gunpowder gass evacuating out of the shell without muzzle regardless of the pill’s movement. The numerical simulation result was identical with the experimental. Then simulated the evacuating process of gunpowder gass of an artillery with muzzle brake. The result showed complicated wave structure of the flow fields with the muzzle brake and analysed the influence of muzzle brake to the gass flow field distribution.

The precipitation kinetic and behavior of δ phase in Inconel 718 alloy at 900, 930 and 960°C have been studied using the quantitative X-ray diffraction (XRD) method. The results indicated that the nucleation site and way of δ phase depended on temperature by the observation of microstructures. During the aging process, the δ phase nucleated on the grain boundaries and twin boundaries preferentially, while the δ phase precipitated directly from the interior of grain when the temperature was above 900°C. At a certain aging temperature, the relationship between the δ phase content and the aging time fitted an Avrami-type equation.

Roller-mark is a common problem in offset printing and its solution method is important for printing. A new detecting method of texture analysis was given in this paper. In this study, printing image was acquired with high-speed CCD. Compared the difference between printing image and standard image, a defective image was obtained. Then the reason of roller-marks was given by the texture recognition of defect image. Finally, experiments were taken to prove the feasibility and effectiveness of this new method for the roller-marks diagnosis in the offset printing machine.

The forecasting precision of short-term wind speed is not high for its chaos and time-varying. Aimed at the problem, the novel data space is reconstructed with the best embedding dimension and time delay according to the phase space reconstruction. On the basis, neural network (NN) is used as the modeling tool with the novel sample data. Meanwhile, the structure of NN is confirmed compared with the others on the precision. In the end, the model of short-term wind speed is able to be obtained. The results show that the method is available and the Mean absolute error (MAE) is decreased to 16.2% for 2 hours.

The thermal conductive silicon rubber have been prepared by using aluminum nitride as filler. The morphology and dispersion propriety of the filler were investigated by Scanning electron microscopy. The thermal conductivity of the composites was analysized by thermal measurement system. The results show that The larger particles give rise to a higher thermal conductivity of composites, at the same time the thermal conductivity of the composites increase with increase of aluminum nitride filler fraction. When the particle size is 60 nm, the thermal conductivity of composites at 40% volume fraction is about 3.5times that of pure silicon rubber matrix.

carbon nanotubes were synthesized by pyroysis method using copper nanoparticles as catalyst. The structure, phase composition and hydrogen storage capacity were investigated by TEM, XRD spectra and Electrochemical System. The results show that the diameter of carbon nanotubes is 200-500nm, The P-C-T curve of adsorbing hydrogen of samples was measured in the pressure up to 12 MPa at room temperature. we show that a SWNT can strongly adsorb up to 8-wt% hydrogen. These results advance our fundamental understanding of dissociative adsorption of hydrogen in nanostructures and suggest new routes to better storage and catalyst materials.

An improved artificial immune algorithm is proposed for geophysical P-wave amplitude variation with offset (AVO) inversion. In this paper, the algorithm is described and implemented. The orthogonal crossover is used to generate the initial population and the elitist-crossover is adopted to add the good patterns of the population. The hybrid mutation method is presented to increase the ability of local and global optimization. The improved immune algorithm is then applied to earth interface models of Mexican gulf for AVO inversion. The experimental results show that the improved algorithm is of high precision than the traditional immune algorithm.

The paper aims at the simulation on double tank water level control based on MATLAB .Double tank water level control belongs to large time delay system. In this paper, adopted PID method to control the system, Then, fuzzy PID control method was used to adjust this second-order system. And the simulation model of this system is built with MATLAB Fuzzy and SIMULINK. And at the end, analysis the system stability ,reaction velocity and so on.

As the urban new developing strategy and mode, low-carbon economy meets the requirements for the sustainable development in the urban area. On the basis of development analysis for the low-carbon economy home and abroad, this paper illustrates the challenges that urban area meets in the process of low-carbon economy and sustainable development by taking the example of Baotou, as well as making proposals and suggestions accordingly.

In order to get highly monodispersed nanoparticles, a post-synthesis separation of nanopaticles polydisersed in size and shape is often desired, although the experimental conditions for the synthesis of nanoparticles are carefully controlled. Using continuous density gradient centrifugation, Ag nanospheres, nanocubes, and nanowires can be separated from polydisperse samples. Size and dimension analysis by sanning electron microscopy and absorption spectroscopy prove that density gradient centrifugation is a powerful method to obtain monodisersed nanoparticles.

Ethanol extracts from Hohenbuehelia serotina and Armillaria mellea fruit bodies were prepared and investigated for their antioxidant capacities in three different assays, namely, 1,1-diphenyl-2-picrylhydrazyl (DPPH) free radical scavenging activity, reducing power and chelating ability on ferrous ions. Among the two mushrooms, ethanol extracts from A. mellea was more effective than that from H. serotina in scavenging DPPH free radical ability, while ethanol extracts from H. serotina was some higher than that from A. mellea in reducing power. With regard to chelating effect on ferrous ions, at 5 mg/mL, chelating ability of ethanol extracts from H. serotina were 43.17 %, while that from A. mellea was 46.54%. It can be concluded that ethanol extracts from A. mellea and H. serotina were good in antioxidant properties.

A BLDCM drive system based on Z-source converter is proposed in this paper, it can be integrated to control DC bus boost and BLDCM speed by Z-source transformation technology, which not only improve energy efficiency but also raise the system security. The algorithm of PWM is applied to control Z-source inverter, which is simulated by Matlab/Simulink, the results are shown to verify the features of the Z-source inverter for BLDCM drive system, and confirm that the method is correctly and availably.

The lithium ions transferring into cathode material are similar as nonequilibrium carrier in semiconductor while the cell discharges at constant current small enough. The inpouring Li-ions can be called nonequilibrium Li-ions. The electrochemical diffusion coefficient, named as D, can be worked out approximately in terms of the relationship between the concentration of nonequilibrium Li-ions and the relevant potential difference. The D was found 3.21×10-10cm2/s for LiFePO4doped with 10% acetylene black.

Aim at a current our country the construction invested in the middle of the item an existent problem to carry on analysis, to domestic and international construction item behind evaluated a theoretical development to make to elaborate, and analyze our country behind evaluate current performance present condition of mechanism and the blemish of existence, put forward some improvement suggestions.After pointing out at the same time evaluate is the important link that constucts an indispensability in the item period, have count for much meaning to decision level and investment efficiency that raises item, at our country its development should have vaster prospect.

We prepared Solid silicon nitride nanowires using carbon nanotubes as precursors., Si and SiO2 were used as raw materials,the reaction was carried out in ammonia atmosphere The structure, phase composition, ESR properties and oxidation resistance of the sample were investigated. The results showed that the sizes of the nanorods are 60–80 nm in diameter and up to several microns in length. In the products α-Si3N4 is the main component; the FTIR spectra of the silicon nitride nanowires have blue shift phenomena;The ESR properties show that the as made materials contains a large number of unpaired electrons

We synthesized carbon-coated iron magnetic nanoparticles by a low cost method using Ferric nitrate as the iron precursor and starch as both reductive agent and carbon source under H2 atmosphere. The structure, size distribution, phase composition, magnetic properties and oxidation resistance of the particles were investigated by transmission electron microscopy, X-ray diffraction, vibrating sample magnetometry and differential scanning calorimetry. The results show that the carbon-coated iron nanoparticles are spherical particles with a diameter of 20-40 nm. They are particles of core-shell structure with an iron core inside and an onion skin carbon layer outside, carbon layer can protect inner iron core from been oxidized, the hysteresis curves show that they are super paramagnetic materials. At the same time the annealing can change the magnetic properties of carbon coated iron nanoparticles.

A new scheme for fault identification during power swings is proposed in this paper. The new scheme is based on the orthonormal wavelet transform algorithm. The main advantage of the proposed scheme is that different types kinds of fault of the transmission line can be correctly identified from different types of the fast power swings. Also, the faults during power swings can be identified from the power swings with the proposed scheme without any time delay. Furthermore, the problem whether the protection should trip or not immediately for the distance protection is discussed in the paper. Test results with the data sampled from EMTP verify the effectiveness of the proposed scheme. Furthermore, another advantage of this algorithm is that it can be realized for the real-time applications with finite real calculation.

After analyzing the features of all kinds of CAD software program, this paper reaches such a conclusion: most of traditional bridge-design programs focus on calculating structural load, so nowadays the calculating feature of this software programs is greatly improved. At the same time, a common problem is still with traditional bridge-design software programs, and this problem is all this programs don’t have any model that offer information referred to the bridge being designed, and this problem result in isolation of data in different stage of designing. To solve this problem, this paper proposes that railway bridge CAD software program take ACCESS as core database and AUTOCAD as supporting graphical system, and we should develop new software program on this basis. This paper also propose that bridge-design software program we develop in future should take design knowledge and bridge information referred to 3D geometric data in consideration, so that the design software program can reuse the characteristic component databases and all kinds of information in different design stage.

In this paper, the silicone rubber composed of carbon fibers was prepared. The influence of different concentration of carbon fibers on the conductivity, electromagnetic shielding interference effectiveness property of the silicone rubber was discussed from the point of view of condition of carbon fiber and silicone rubber. The results showed that there existed the extreme conductivity and shielding effectiveness (SE) across the tested frequency range from 2.6 GHz to 3.95 GHz of silicone rubber composites filled with carbon fibers. When the content of the carbon fibbers was 50 parts per hundred of rubber (phr), the SE values of composites were typically above 63 dB and close to the extremum. The compact packing structure of carbon fibers does not play an important role in improved the conductivity of composite. The SE of the composite depends on the conductivity of composite.

The study on combustion characteristics of different excess air ratios (λ) and ignition timings was conducted on a lean-burn spark-ignition CNG engine, and the corresponding emission characteristics was also analyzed. The results show that the curve of cylinder pressure moves towards TDC, and the CoVimep decreases with the advance of ignition timing. With the excess air ratio increasing, the CoVimep increases while the cylinder pressure decreases firstly, and then increases. The flame development duration increases with the ignition timing advanced, but the rapid flame duration decreases, the total combustion duration basically keep constant, and all of them increase with the increasement of excess air ratio. Best fuel economy was gotten at λ=1.2. With the excess air ratio increasing, the CO and NMHC emissions decrease, the NOx emission firstly reaches to a peak value, which is about 3000ppm at λ=1.2, and then decreases. Both of the THC and CH4 emissions have opposite trends to NOx emission. All the emissions mentioned above increases with the advance of ignition timing.

Holiota nameko is an edible mushroom widely cultivated in the northeast of China. The cold water, hot water and ethanol extracts were prepared and their antioxidant properties were studied. At 2 mg/mL, the cold water extract showed a high reducing power of 1.502, whereas those of hot water and ethanol extracts were 0.868 and 0.159. With regard to the scavenging ability on DPPH free radicals, extracts were effective in the order: cold water > hot water > ethanol extracts. EC50 values for chelating ability on ferrous ions for cold water, hot water, and ethanol extracts were 1.461, 0.663, and 11.791 mg/mL, respectively. Based on EC50 values, the water extracts of P. nameko were effective antioxidants.

Hot water extracts from Armillaria mellea and Hohenbuehelia serotina fruit bodies were prepared and investigated for their antioxidant capacity in three different assays, namely, 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging activity, reducing power and chelating ability on ferrous ions. Among the two mushrooms hot water extracts, extract from A. mellea was better than that from H. serotina in scavenging ability and chelating effect on ferrous ions. With regard to reducing power, EC50 value of extracts from H. serotina was 0.447 mg/mL, while that of extracts from A. mellea was 1.914. From EC50 values obtained, it can be concluded that hot water extracts from A. mellea and H. serotina were good in antioxidant properties.

The detection of localized defects such as cracks and corrosion in pipes using guided waves has been shown to be an effective nondestructive evaluation technique for structural health monitoring (SHM). Cross borehole tomography in seismology is introduced into the guided wave inspection of a pipe when the pipe is considered as an unwrapped plate. Guided waves propagating in pipe with a crack defect are simulated using the finite element model and the arrival times for the fastest modes are extracted and sent to the tomographic algorithm. The tomographic reconstruction is based on the simultaneous iterative reconstruction technique (SIRT). For some cylindrical shell geometries such as stacked storage tanks, access to the entire circumference of the structure could be impractical or even impossible, three different image fusion techniques are used to enhance the image equality reconstructed from the incomplete datasets. The results show that the defect is more pronounced after imaging fusion.

Guided wave tomography has shown great potential for quantitative nondestructive evaluation in structural health monitoring. An improved simultaneous iterative reconstruction technique (SIRT) combining genetic algorithm (GA) is presented in order to improve image quality of guided wave tomography. The simulated reconstructed images of flawed plate and pipe using usual SIRT and improved SIRT methods have been compared quantitatively and qualitatively.

The effect of δ phase content on the hot deformation behavior of alloy IN718 has been investigated using isothermal compression tests. The results indicated that the δ phase has a significant effect on the deformation behavior of alloy IN718 during hot working. After the peak stress, the decreasing speed of the stress raises as the increase in the δ phase content. The deformation activation energy for alloy IN718 increases with the raise of the δ phase content. And the peak strain for the alloy decreases with the increase of the δ phase content, which indicates that the δ phase can stimulate the occurrence of dynamic recrystallization during hot working.