bluuebunny/crossref_metadata_2025 huggingface dataset:
Enhanced Production of Mycelia by the Medicinal Mushroom Cordyceps militaris Using Plackett-Burman Design and Response Surface Methodology
Authors: Liu Xiao Yu , Meng Fan Xing , Zhang Yi Bo , He Huan , Han Wei , Juan Wang , Teng Li Rong
Published: November 2011

Response surface methodology (RSM) was used for statistical optimization of fermentation medium that influenced the yield of endo-polysaccharide from cultivated mycelia of Cordyceps militaris. First, the Plackett-Burman design was used to evaluate the effects of ten variables including glucose, maltose, peptone, yeast extract, KH2PO4, MgSO4, CaCl2, VB1, inoculum density and medium capacity. Among these variables, glucose, peptone and yeast extract were identified to have the significant effects. Subsequently, response surface methodology based on a five-level three-factor central composite design was employed to determine the maximum dry weight (DW) of mycelial biomass at optimum concentration of glucose, peptone and yeast extract. The mycelia growth was found to correlate to the three parameters that could be represented by second-order polynomial models. The optimal values of the three parameters were determined as 4.62% glucose, 3.36% peptone and 0.43% yeast extract. The prediction DW was 23.727g/L. The actual experimental results were in agreement with the prediction.
Transparent-Component-Decimation Method for Studying the Optical Transmission of One Kind of Aperiodic Superlattices
Authors: Hu Xu Bo , Li Jun Feng
Published: November 2011

Transparent-component-decimation (TCD) method may simplify the aperiodic sequences to the simplest form and one can obtain the transmissive characteristics without complicated calculations. Applying this method to the Family A of Generalized Thue-Morse [FAGTM(n)] aperiodic superlattices, we obtain directly the formulas of the transmission coefficients at the central wavelength. The results are in accord with the previous published results. It shows that the TCD method can be used to study optical transmission normally through aperiodic multilayers directly and exactly and has bright future.
Ultra-Precision Machining Technology Based on Dynamic Minimum Thickness of Cut for Machined Single Crystal Materials
Authors: Kuai Ji Cai
Published: November 2011

The dynamic minimum thickness of cut for the ultra-precision machining surface quality is important influence. Between tool and the workpiece for the friction coefficient were analysised, the relationship of the friction coefficient and the MTC were discussed, and the MTC and its effects on surface roughness were a theoretical analysised and experimental verification with processed single crystal copper and single crystal aluminum by AFM’s diamond tip. The results show: the MTC of single-crystal copper (single crystal aluminum) is 5.2nm (8.2nm) in stable cutting conditions. Further processing single crystal copper (ingle crystal aluminum) with cutting thickness of 5.2nm (8.2nm), and the surface roughness Ra160nm (Ra110nm) is obtained. So the MTC is evolving with the friction coefficient and the force ratio, theoretical MTC tends to be minimal value then before the adhering effect to reach remarkable. Appropriate adjustments cutting parameters, the cutting process can always micro-cutting phase to reach the steady-thin chip, and no plowing phenomenon. So the surface residues highly were reduced and higher surface quality was achieved.
The Preliminary Study on Air-Jet Spinning Spun
Authors: Wang Xiu Zhi
Published: November 2011

Air-jet spinning combines the advantages of the false twist jet spinning and open end spinning. This paper discusses the property of the air-jet spinning and the main structural factors affecting air-jet spinning yarn strength.
Top-Down Modularization Using Extensible Skeleton Model
Authors: Deng Ping , Zhang Meng , Wu Bao Zhong , Gong Jing Zhong , Li Guo Xi
Published: November 2011

By combining modular design with top-down design, a composite design method is proposed in this paper, namely top-down modularization. This design synthesis is achieved based on extensible skeleton model (XSM). XSM is developed oriented to design reuse by integrating traditional skeleton model with useful knowledge, resources, processes, et al. According to the characteristic of multilevel structure of products, a hierarchy framework of XSM is built. In addition, the top-down modular design process based on XSM is established. A design case of a typical two-axis servo mechanism is studied to illustrate as well as to demonstrate the validity of the method.
Research on Transmission Efficiency of Cycloid Cam Speed Reducer
Authors: Yang Jun Kai , Xu Yun Jie
Published: November 2011

Cycloid cam speed reducer is a widely used transmission. In practice, there are many kinds influence factors which affect transmission efficiency of cycloid cam speed reducer. In this research, dynamic measurement of the transmission efficiency has carried out by experiment It mainly studies the relationship between speed, load change and transmission efficiency during cycloid cam speed reducer working process. Experiment results show that transmission efficiency of cycloid cam speed reducer could be improved by increasing the load, other methods can also use such as reducing the input rotational speed.
Designing and Experiment Study on Front Impact Attenuator for Formula SAE Racecar
Authors: Wang Jian Hua , Xi Da Shuai , Zhao Shuai , Wang Shi Chao
Published: November 2011

According to the rule of China Student Formula SAE Competition, This paper discussed and designed the structure. It then chose aluminum-honeycomb and aluminum sheet to make the impact attenuator. Then static and dynamic experiments were carried out to test its performance. It finally drew a conclusion that the design could provide good protection for the driver and racecar. It could also be used on other similar vehicles.
Study on Integrated Framework of Mathematical Mechanization for NC Trajectory Planning
Authors: Deng Hua Bo , Liu Wei Jun , Gao En Yang
Published: November 2011

In order to apply mathematical mechanization method during trajectory planning for NC machining, a platform framework is put forward which integrates the mathematics mechanization and trajectory planning. The essence and application of mathematical mechanization is analysis. The basic process and the correlation function of trajectory planning are discussed based on mathematical mechanization. The technology system of mathematical mechanization platform is established for the trajectory planning. And the operation flow of the mathematical mechanization platform is defined.
Study on Noise Control of Fan with Air Suction
Authors: Wang Li Jun , Pan Zhi Yang
Published: November 2011

Fan is a pneumatic device in the 4ZTL-1800 combine harvester threshing prior to cutting. Based on the prophase search result that fan noise is highest when fan rotates at 1200r/min, in order to decrease noise of it, sigle-microperferated-panel muffler, double-microperferated-panel muffler and interposition muffler were designed and tested. The results show that double-microperferated-panel muffler is best and sound power level of fan is decreased 11dB, and that interposition muffler is better, and that sigle-microperferated-panel muffler is worst to descrease fan noise. Through contrast on transmission power loss of different mufflers, cone-shaped double-microperferated-panel muffler is verified to be best for noise control of fan.
Aerodynamic Design and Analysis of Propeller for Solar Powered Unmanned Aerial Vehicle
Authors: Wang Hao Jie , Li Jie , Fu Wei Jia
Published: November 2011

By comparing the advantages and disadvantages of several different aerodynamic theories for propellers, the strip theory is applied to predict the performance of propeller at the primary design station of propellers, and the Multiple Rotating Reference Frames (MRRF) method based on solving the N-S equations is applied to evaluate the aerodynamic performance of propeller. The validation of the MRRF method is against the experimental data of a propeller. The comparison of calculated result with the experimental data shows that, the MRRF method used in this paper is reliable to predict the aerodynamic performance of propellers. The cruise altitude of Solar Airplanes is usually very high, so the Reynolds numbers of the propeller sections are very low. The key factor of the aerodynamic design of the propeller is that how to keep the propeller at high cruise efficiency by the output power restriction of the electromotor. The analysis of the designed propeller shows that the cruise efficiency of the designed propeller is no lower than 70%, and the power required at the best cruise efficiency condition is match for the rated output power of the electromotor.
Steady Air Injection Flow Control in Centrifugal Compressor
Authors: Benhegouga Islem , Yang Ce
Published: November 2011

In the present work steady air injection upstream of the leading edge was used in a centrifugal compressor, Whose preliminary design of compressor injection systems can be modeled by a geometrical relationship between user-specified yaw angle and resulting blade incidence angle based on simple velocity triangles, the error between the best yaw angle obtained from this relationship and that obtained from numerical simulation is less than 3%. To reveal the mechanism, steady numerical simulations were performed on high pressure ratio centrifugal compressor rotor operated with a rotor tip speed of 586 m/s. Parametric studies of the injection yaw angle was performed to determine the configuration that provide the best steady results for the compression systems studied in this work. The injectors were placed at short distance (ten percent of the inlet tip radius upstream of the compressor face) the objective of this was to achieve maximum control over the leading edge flow by varying individual injection parameters. The injection angle, α, was fifteen while the yaw angle, β, was parametrically varied. The results show that at design speed (n= 50 000 r/min) with injection flow rate equal to 3% of the main flow rate and 25 degree air injection yaw angle can lower the mass flow rate at stall for approximately 7.5%.
Fracture Mechanics Analysis of Hydraulic Cracks in Asphalt Pavement
Authors: Zhang Xiao Chun , Sun Feng Mei , Wang Yuan , Zhang Ning
Published: November 2011

Water damage in asphalt pavement is related to the interaction between cracks and hydrodynamic pressures caused by the vehicle. A 3D finite element model of the hydraulic crack in asphalt pavement was built to analyze the crack propagation character under vehicle load. The influence of asphalt pavement structure parameters, vehicle speed and crack geometric parameters of hydraulic crack were discussed. Then the differences, between aqueous cracks and cracks without water, were compared. The research results had the guiding meaning for anti-water damage design of asphalt pavement.
Study of Eliminating Calculation Errors in Large-Strain Measurement with Strain Gauges
Authors: Wang Deng Wang , Wang Hui , Liang Zhi Gang , Tang Shi Ying , Li Yan
Published: November 2011

Resistance strain gauge is common used in strain measurement, particularly in small elastic strain measurement, it has many advantages. However when the measured strain increases, the output nonlinearity of the Wheatstone bridge will become obvious; in this paper the nonlinearity error of the output in large-strain measurement is analyzed, and based on this a mathematical algorithm for nonlinearity compensation is proposed; finally the effect of the algorithm for nonlinearity compensation is proved by theoretical research and experimental treatment.
Spline-Based Finite Element Analysis in Composite Laminates Mechanical Properties
Authors: You Feng Xiang , Zhang Fei , Zuo Buo Lei
Published: November 2011

The geometric parameters of the composite laminate in the engineering structure tend to have random properties. It is of great significance on how to study sensitivity of random parameters of laminated plates and carry on the optimized analysis to the parameteranalys when accurately estimating the reliability of structural design. According to the first order shear deformation theory, by using the spline finite element method, we can infer and the establish a laminated plate vibration equation, the stiffness matrix, mass matrix, proportional damping matrix, before making solution of the antisymmetric laminated plates response sensitivity formula, and analyzing the normal displacement, the sensitivity, the natural frequency of compound materials laminated plate. The Numerical examples verify the effectiveness of this algorithm.
Experimental Research on Force/Position Control of a Wire-Driven Parallel Rehabilitative Robot
Authors: Wang Ke Yi , Ma Fang Chao , Hao Meng , Zhang Li Xun , Liu Pan
Published: November 2011

During rehabilitative training, a 3-DOF wire-driven parallel robot driven was designed to coordinate and control the trainer pelvis movement. Based on the force balance equation of the end-effector, the stiffness problem about the robot system was analyzed and one kind of force/position parallel control strategy was proposed that the position loop would realize the end-effector motion trajectory, and the force loop would control the wire tension. The experimental results have shown that the robot systematic stiffness is related with the wire tension and can be changed to realize the compliance control of the robot system by adjusting the wire tension.
Application of Modern Emission Spectrography in Oil Monitoring
Authors: Yu Bo Jian , Li Xin Nian , Jiang Xu Feng
Published: November 2011

In this paper, the principles of modern emission spectrography technique was described and the analytical process and characteristics of it was introduced. Based on an review of its application in equipment oil monitoring, emission spectrography was thought a very valuable technique of lubricants condition monitoring. Now, emission spectrography has become the core of the modern oil monitoring technique, and its development and application prospect are extremely wide.
Research on the Warm Deep Drawing of AZ31 Magnesium Alloy Sheet Based on DYNAFORM
Authors: Cao X.Q. , Wang J.W. , Liu Y. , Chi Cheng Zhong , Li L.C. , Wang Hong Xia
Published: November 2011

The effect of forming temperature on the deep drawability (limit drawing ratio (LDR)) of AZ31 magnesium alloy sheet was studied both numerically and experimentally by the use of finite element analysis software DYNAFORM and specially designed warm deep drawing die set. The simulation model was built by SolidWorks 2009, 3-Parameter_Barlat model with BT shell unit was adopted as material model. The constitutive relation of the material was provided by uniaxial isothermal tension tests at different temperatures. After being set, all parameters were referred to famous explicit dynamic solver LS-DYNA. The simulation results showed that the LDR of the AZ31 magnesium alloy sheet is increased with the increase of the temperature initially, but after the temperature reached 423K, the LDR reached the maximum, and then decrease with the increase of temperature in the temperature range studied (room temperature-673K). PTEF was used as lubricant in the experiment. Experimental results showed same trend as numerical simulation results in the studied range of temperature, and LDR reached the maximum of 3.0 at 423K. It is shown that the results of numerical simulation have a good agreement with that of the experiment. By analyzing the microstructure of the drawn-cup walls at different temperatures, it is found that grains were stretched along the direction of tension at temperatures lower than 423K. And there appeared a large number of fine recrystallized grains when forming temperature is 423K showing that dynamic recrystallization occurred during forming process. Dynamic recrystallization conducted completely when forming temperature increased higher than 423K, but the material softening would aggravate with the increase of temperature and on the contrary would do harm to the deep drawing of AZ31 magnesium alloy sheet, resulting the decrease of LDR.
Characterization of Friction Stir Welded Joints in TA15 Titanium Alloy Plates
Authors: Xie Fei Fei , Huang Chun Ping , Dong Chun Lin , Ke Li Ming
Published: November 2011

Friction stir welding (FSW) was applied to TA15 titanium alloy plates. Welds were produced by employing rotational speed of 375rpm and a travel speed of 23.5mm/min.The microstructure and mechanical properties of friction stir welded joints were investigated. Flow pattern of the materials also were analysed. The stir zone (SZ) was characterized by α-phase and β-phase, but the size of the grain in the middle of the SZ was much finer than that of the upper. The interface between the base metal (BM) and SZ is associated with the flow state of the plastic materials. Results of transverse tensile test indicated that all the joints exhibited lower tensile strength than the BM, and the maximum tensile strength of the as-welded joint is about 97.6% of the average strength of the BM.
Experimental Observation on Antiatheroscloresis Ability of Total Flavonoids from Jumi in Hyperlipidemia Rats
Authors: Xu Guang Tao , Wu Xiao Wei , Zhou Xin Mei , Chen Shi Piao , Shen Shen Rong
Published: November 2011

In this study, we observed antiatheroscloresis ability of food-roune hyperlipidemia by total falconoid from Jumi in rats. We used hyperlipidemia model of rats established, intervened by total falconoid from Jumi. Rats were divided into normal control group, hyperlipidemia control group, higher dose group and lower dose group to observe the level of total cholesterol (TC), trilaurate glycerin (TG), high density lipoprotein (HDL), low density lipoprotein (LDL) and atherogenic index (AI), and take rat liver for regular pathological dyeing observation. The results shown that the total falconoid from Jumi could reduce the serum levels of TC, TG, LDL and AI significantly, and increase HDL/TC in compared with hyperlipidemia control groups. It had significantly curative to effect hepatic adipose infiltration in rats, especially in low doses of flavonoid. Total flavonoids from Jumi can regulate disturbance of lipid metabolism, hepatic adipose infiltration and arteriosclerosis.
Trigeminocerebellar Projection in the Carp (Cyprinus carpio)
Authors: Xue Hao Gang , Gai Xiao Dong , Li Chun , Sun Wei Qi , He Xin
Published: November 2011

Tract-tracing methods were used in our research to observe the fibrae connection between cyprinoid nucleus sensorius nervi trigemini and cyprinoid cerebellum. After biotinylated dextran amine (BDA) was injected into cyprinoid principal nucleus sensorius nervi trigemini, the direct motioned extremity sensorius nervi fibers of trigeminal nerves was observed exist in hibateral cerebellum nucleus lateralis valvulae, principally distributed in the contralateral hibateral cerebellum nucleus lateralis valvulae. No extremity sensorius nervi fibers of trigeminal nerves was marked. If BDA was injected into regressed motioned extremity sensorius nervi fibers of trigeminal nerves of cyprinoid hibateral principal nucleus sensorius nervi trigemini and trigeminal nerves descended nucleus, most of them were observed in opposite side. The direct motioned marked extremity sensorius nervi fibers were observed in cerebellum and valvula cerebelli. Most of the cerebellum label neurons injected by BDA existed in tautomeral nucleus lateralis valvulae, only a few of them were in opposite side. The results of our research proved that centrifugal fibers of cyprinoid nucleus sensorius nervi trigemini project indirectly onto cerebellum through nucleus lateralis valvulae .
Analysis of Volatile Compounds of Mycelia of Hirsutella sinensis, the Anamorph of Ophiocordyceps sinensis
Authors: Yu Shi Jun , Zhang Ying , Fan Mei Zhen
Published: November 2011

In this work, the volatile compound profiles of mycelia of H. sinensis cultured by solid-state media and submerged fermentation were extracted and determined for the first time. Fifty-one volatile compounds were identified in both mycelia. Phenols and acids and alkanes were found as the major classes of compounds. And butylated hydroxytoluene is the most abundant volatile compound in the both mycelia and accounts for 47.38% and 46.12% of the total volatile compounds in the mycelia cultured by solid-state media and submerged fermentation, respectively.
Antioxidant Activity and Total Phenolics of Broussonetia papyrifera Flower Extracts
Authors: Sun Jie , Zhang Chu Shu , Yu Li Na , Bi Jie , Liu Shao Fang , Zhu Feng , Yang Qing Li
Published: November 2011

Ethanol and water crude extracts from the flower ofBroussonetia papyriferawere investigated for their antioxidant capacity in four different assays, namely, the 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging activity, chelation of metal ions (Fe2+), reducing power and inhibition activity of lipid peroxidation in a linoleic acid emulsion system. Among the two extracts, the ethanolextract fromB. papyriferaflower showed the most potent radical scavenging activity in each assay, showing 62.88.9% (at 5 mg/ml) in the DPPH radical scavenging method (at 6 mg/ml) and 61.15% of chelation Fe2+- activity. Total phenolics in the water extracts were higher than that of the ethanol ones. Positive correlations were found between total phenolic content in theB. papyriferaflower extracts and their antioxidant activities.B. papyriferaflowers may have potential as natural antioxidants.
Biocompatabiltiy of Chitosan/Poly(L-Lactic Acid) Composite Scaffolds with Three-Dimensional Honeycomb Patterned Structure
Authors: Zhao Ming Yan , Li Li Hua , Sun Guo Dong , Zhou Chang Ren
Published: November 2011

Three dimensional (3D) scaffolds provide the necessary support for cells to attach, proliferate and differentiate, and define the overall shape of the tissue engineered transplant. In this study, 3D honeycomb patterned chitosan/poly (L-lactic acid) composite scaffolds fabricated by an easy manipulated technique with good mechanical property and cytocompatability, as demonstrated by a previous study. Here we investigated further the in vitro cytocompatibility and spine regeneration in vivo by implanting the construct into male white rabbits for 4 and 8weeks. Results showed that such a honeycomb patterned scaffolds have a good cytocompatibilty. Also, the rabbit spinal defect was perfectly restored. These findings supported that such a 3D honeycomb patterned scaffold is an ideal candidate for the tissue engineering scaffold.
Optimization of the Freeze-Drying Media and Survival throughout Storage of Freeze-Dried Aerotolerant Bifidobacterium animailis Subsp. Lactis Qq08
Authors: Li Qing Qing , Xu Juan , Chen Mei Ling , Ruan Hui , He Guo Qing , Wu Xue Qian
Published: November 2011

The aim of the present work was to optimize the formula of cryoprotectants for freeze drying process of the previous selectedBifidobacteriumanimailissubsp.lactisQq08 (Bl Qq08). Single factor and orthogonal experiments were conducted to optimize the cryoprotectants formula. The formula of cryoprotectants was optimized as follows: skim milk 15%, lactose 8%, Vc 1.5% and glycerol 3%. In the triplicate lyophilization tests, the average survival rate of Bl Qq08 reached 91.23%.The optimized formula of cryoprotectants was suitable for freeze drying of the Bl Qq08.
Study on Protein Components and Microstructure of the Japonica Restorer Line M119 with High Protein Content
Authors: Hua Ze Tian , Ding Yi , Wang Fang , Zhang Qin
Published: November 2011

A japonica restorer line (named m119) with extremely high protein content was bred successfully, whose protein content (wet base) reached 13.30%±0.19% in brown rice. SDS-PAGE analysis showed that the proportion of glutelin to total protein content increased to 71.77% in m119 compared with CK. The fracture of m119 grain was rough compared with CK, which might bring about negative influence to cooking and eating quality. However, there was no significant difference of endosperm cell in size, shape and distribution compared with CK. The increase of protein content in brown rice was neither proportion nor synchronization; The axis of japonica rice grain was nearly at the center and close to the ventral part of the grain fracture observed by confocal laser scanning microscopy, which was associated with the distribution of vascular bundles transporting nutrition to the grain. The proportion of smooth to rough surface in soaked grain fracture had certain correlation with protein content and cooking and eating quality.
The Arsenic Concentration in Saliva, Urine and Drinking Water in Endemic Arsenicosis Area in Shanyin County of Shanxi Province, China
Authors: Wang Da Peng , Wang San Xiang , Wang Zheng Hui , Zhang Li Ming , Li Jian , Liu Jian , Liu Xing , Jin Huan Yu , Fu Chun Ling , An Yan
Published: November 2011

Biological monitoring for arsenic(As) is usually based upon a determination of urine, blood, nail and hair arsenic concentration, however, saliva has been suggested as a non-invasive biological matrix for assessing exposure. To further evaluate the potential utility of saliva for arsenic biomonitoring, Atomic Fluorescence Spectrometry(AFS-230) and Inductively Coupled Plasma Mass Spectrometer (ICP-MS) were used to evaluate the concentration of arsenic in drinking water, saliva and urine in endemic arsenicosis area in Shanyin County of Shanxi Province. The results showed that the arsenic concentration in drinking water was 0.55-720.0ug/L, and there were 66.67% samples above the arsenic level (50μg/L) of standards for drinking water quality. The median value of arsenic in drinking water was 127.22 μg/L. The salivary and urinary arsenic both can reflect the exposure of arsenic in drinking water. Additionally, there was a significant positive association of salivary arsenic compared with arsenic in drinking water (r=0.674, P<0.05)and urinary arsenic(r=0.794, P<0.05). These results demonstrated that, similar to urinary arsenic, salivary arsenic also can be used as a biomarker for assessing human exposue to arsenic.
The Effects of High Altitude Hypoxia Environment on Ultrastructure and the Expression of HIF-1α in the Rat Lung
Authors: Li Wen Hua , Yuan Dong Ya , Sun Fang Yun , Zhao Feng Cang , Zhang Min , Liu Zhong
Published: November 2011

Background: Studies show that rapid access to high altitude, the body inevitably will be different degrees of injury, more significant damage to heart and lung [1 ~ 3]. The high altitude hypoxia on the lung tissue to adapt to structural changes and hypoxia inducible factor-1α (HIF-1α) expression of the study rarely reported. The experimental area for a short time brought by the near sea level to higher altitudes rat lung tissue by light, electron microscopy and the expression of hypoxia inducible factor-1α changes were studied.Objective: To observe the altitude hypoxia on the ultrastructure of lung tissue and the hypoxia inducible factor-la (HIF-1α) expression.Methods: 50 rats were randomly divided into 5 groups, namely group 1 d Golmud (altitude 2 700 m), 2 d Tanggula group (altitude 5 000 m), 3 d Nagqu group (altitude 4 500 m) and 30 d Nagqu group (altitude 4 500 m), the control group (in Xi'an, elevation 5 m). 4 time-consuming experimental animals 1 d from Xi'an to the Golmud, Qinghai (altitude 2 700 m), 2 d to the Tibetan Tanggula (altitude 5 000 m), 3 d to the Naqu (altitude 4500 m), 30 d in Tibet Nagqu. Light and electron microscopy of the lung tissue samples, Western Blot method to detect the lung tissue of hypoxia inducible factor-1α expression, RT-PCR method for detection of high altitude hypoxic group, lung tissue expression of hypoxia inducible factor-1αmRNA change. Results and Conclusions: Acute hypoxia 2d Tanggula microstructure and ultrastructure of lung tissue apparent high altitude pulmonary edema, and 30d after hypoxic Nagqu group after high altitude pulmonary edema was significantly reduced lung tissue Western blotting, not Canon See HIF-1α protein expression, RT-PCR detection of HIF-1αmRNA in the 30d Nagqu group, a certain amount of expression, the other three experimental groups HIF-1αmRNA expression was not significant (P> 0.05), 30d Nagqu group HIF-lamRNA expression was significantly higher In the control group (P <0.01). The results confirmed that the lung tissue after hypoxic expression of HIF-1αmRNA increase will help reduce the hypoxic altitude pulmonary edema.
A Comparison of Germicidal Efficacy between Air Disinfectant Machine and Ultraviolet Disinfection in the Dental Implants Surgeris
Authors: Gao Yong Bo , Wu Xi Feng , Zhou Li Wen , Jiang Ai , Yang Li Ming , Lin Xuan , Sun Hong Chen
Published: November 2011

Objective：The aim of the study was to explore most effective way to control infection during implant treatment. Methods: The study was carried out in two implant operating surgeries (Surgery A, Surgery B), which were set up air disinfectant machine and ultraviolet disinfection respectively. For baseline measurements, the number of bacterials in the air of the two surgeries was counted at 5min, 15min, 30min, 45min and 60min before sanitizing. To compare sanitizing effect of static air disinfection, air samples from these surgeries were collected for bacterial cultivation after sanitizing for 5min, 15min, 30min, 45min and 60min, and the the sterilization rate was calculated. To compare dynamic air disinfection, the two surgeries were sterilized before implant surgery, and the air samples were collected at 5min, 15min, 30min, 45min, 60min after implant operation. Results: There were no significant differences between air disinfectant machine and ultraviolet disinfection in static air disinfection (p<0.05). However, air disinfectant machine was more effective in dynamic air disinfection. Conclusion：Air disinfectant machine is the most effective way for the prevention of nosocomial infections.
A New Expanded Cage Designed for Lumbar Disc Herniation: Finite Element Analysis
Authors: Zhang Hua , Li Wan Li , Li Fang Cai , Chen Qi Xin , Xu Kan , Chen Wei Shan
Published: November 2011

Objective. To evaluate biomechanics of the new-designed cage for lumbar interbody fusion by using FEMs analysis.Methods. Five validated finite element models of L4–L5 lumbar segments were established to simulate the intact lumbar segement, lumbar discectomy and lumbar discectomy instrumented posterior lumbar interbody fusion with single three kinds of cage (threaded cage, impacted cage and new expanded cage), and analyzed the biomechanics of these models.Results. The maximum ranges of motion and the maximum stress of facet joint were appeared in discectomy model, and the insertion of cages obviously decreased the range and the maximum stresses in all motions. However, only the ranges in expanded cage model were lower than those in intact model. Conclusions. The new-designed expanded cage resulted in highest stability and lowest stress of facet joint in fusion models.
Dynamic Performance Extraction and Recognition of the PT Speed Governor Based on Mathematical Morphology
Authors: Wang Xin Qing , Wang Dong , Liang Sheng , Zhu Hui Jie
Published: November 2011

How to eliminate the noise effectively is always a difficult problem when detecting and recognizing the weak signal under complex electromagnetic environment. In order to improve the effect of denoising, the method based on the mathematical morphology was used. Base on the erosion and dilation operations of mathematical morphology, the correct extraction and recognition of dynamic performance of the PT speed governor was realized by the multi-mix operations of plus-minus and open-close, and the result provides a basis for the performance analysis and fault diagnosis of the PT speed governor.
Dynamics Characteristic Analysis of Deliberate Mistuned Bladed-Disk System in Compressor Based on Substructure Method
Authors: Yuan Hui Qun , Zhang Liang , Song Lin
Published: November 2011

In this paper, based on the test data of blade static frequency and simulating blade deliberate mistuned by changing elastic modulus, a method combining dichotomy and finite element is presented which can identify elastic modulus parameters of mistuned blades. Then, when value of the frequency difference is 5Hz and 41Hz, dynamic characteristics of deliberate mistuned bladed-disk system are investigated separately under operating speed, on the basis of substructure method. Apply the exciting force of airflow on the fronts of blades tip. According to dynamic test results, it takes 4 as the excitation order. The analysis results show that with the mistuned frequency difference increasing, the largest amplitude of blade will decrease gradually. The deliberate mistuned scheme of large frequency difference as scheme Ⅱ is more effective than the small one as schemeⅠto reduce the vibration of bladed disk system under working speed of 11300r/min. The analysis results are consistent with the dynamic test ones.
Development of a Master-Slave Architecture Handheld Rotating Machine Fault Diagnosis Instrument
Authors: Wan Jian , Wang Tai Yong , Dong Jing Chuan , Zhang Pan , Hao Yan
Published: November 2011

To insure that sampling signal integrity, accuracy and real-time performance can adapt to the development of rotating machine fault diagnosis technology, a master-slave architecture handheld rotating machine fault diagnosis instrument was developed based on S3C2410 ARM IC and TMS320VC5509A DSP IC. It provided an effective method for the field monitoring and diagnosis of the large rotating machine. The whole design idea and the structure of the hardware and the software were systematically introduced. The paper focused on the master-slave architecture design of the hardware, the communication methods between the master and the slave processor, and the signal pretreatment module design. Put into practice, the practicability, reliability and stability of the instrument were confirmed.
Helmholtz Resonator with Extended Neck and Absorbing Material
Authors: Bi Rong , Liu Zheng Shi , Li Kai Ming , Chen Jun , Wang Yong
Published: November 2011

The acoustic attenuation of Helmholtz resonator including an extended neck and sound–absorbing materials is investigated in current study. A two-dimensional analytical method based on mode matching method is developed to determine the Transmission loss (TL) of a piston-driven model of Helmholtz resonator. The resonance frequency and Transmission loss predicted from this method show reasonable agreements with published experimental results. Finally, this method is used to examine the effect of length of extended neck, extended neck with/without absorbing material and acoustic properties of sound-absorbing material on acoustic performance of Helmholtz resonator.
Design Strategy of Tightening Spindle System on the Principle of Modularity
Authors: Zhang Ya Wei , Yang Jian Guo
Published: November 2011

Modern and reliable tightening spindle systems are indispensable due to importance of bolt connection in assembly technology, and the tightening spindle system is developed in order that automated tightening processes is able to ensure uniform quality of the tightened bolt connection. In this paper, the strategy “torque control and angle checked” of tightening is discussed and analyzed on the basis that the process mechanism of forming bolt connection is clarified. This strategy builds the base and boundary conditions of modular design strategy for tightening spindle system which is introduced, because it makes design flexibly, and many standard components can be chosen with more efficiency and low cost. The module partition bases on the function of the components of the system. The possibility of expansion of the tightening system comes into discussion too.
Software Development of Portable Data-Acquisition and Signal Analysis Instrument Based-on Qt
Authors: Jiang Da Yong , Lin Jin Zhou
Published: November 2011

In order to find the machine fault and take adaptive measures to deal with it accurately and in time for machine equipment fault diagnosis, a portable data-acquisition and signal analysis instrument based on Qt is introduced, which plays an important role in mechanical industry. Qt is a tool which is used to build multi-platform graphical interface in the way of "written once, compiled anywhere”. The factors which make Qt outstanding in most programming tools are the availability of source code, help documentation and high-class technical support and so on. In this paper, how to develop the software of portable data-acquisition and signal analysis instrument is discussed in detail.
The Design of Modal Analysis System Based on an Improved Algorithm of Discrete Orthogonal Polynomial
Authors: Chen Zhang Wei , Yuan Lan , Hu Yan Chao
Published: November 2011

An improved algorithm of the discrete orthogonal polynomial to identify the modal parameters is stated and a modal analysis system is designed and developed by object-oriented programming language Visual C++ here. Then proper experiment device is setup to collect signal data. Finally, compare the algorithm’s result with the ME’scopeVES’s and exam the algorithm’s correctness.
The Optimization Design and Analysis of Motorcycle Frame Structure
Authors: Wang Jiang , Zhou Ji , Li Bao Bao , Li Xiao Ling , Song Shi Yong
Published: November 2011

The optimization theory of the motorcycle frame structure was described. The FEM model of the frame structure was established by Hyperworks software, the stress and fatigue stress of the frame structure was analyzed. The frame parts were optimized through the size and topology optimization according to the stress and the displacement. The result showed that the stress of the frame structure changed little comparing with that before, which was in the permitted range of engineering design. The cost of the motorcycle frame structure was reduced, and the frame weight was lightened about 6.5%.
Analysis and Calculation of Vacuum Film Deaeration for High Viscosity Liquids
Authors: Liu Xiao Bo , Zhang Jian Run , Li Pu , Wang Xin Hua
Published: November 2011

A theoretical analysis of Vacuum Film Deaeration(VFD) based on the characteristics of fluid film on a rotating cone surface is carried out. The motion equation of bubble is derived to find out its relative slip velocity in the flowing film. And the bubbles removal time from the high viscosity liquid is discussed. The thickness model of liquid film on the rotating surface and the residence time of the film flows over the surface are built in this paper. It is found that the thickness and the velocity of the flowing film on the rotating cone surface are the key parameters for VFD; the time of bubble remove mainly includes the growth time and the rest time; the velocity of bubble is slightly lagging behind the main flow; the low angular velocity has little effect on the film thickness; and the time of VFD for flowing film is less than that of static film.
Dynamic Path Planning Algorithm Based on Chaos Genetic Vehicle Navigation
Authors: Feng Ping
Published: November 2011

The paper puts forward the dynamic path planning algorithm based on improving chaos genetic algorithm by using genetic algorithms and chaos search algorithm. In the practice of navigation, the algorithm can compute at the best path to meet the needs of the navigation in such a short period of planning time. Furthermore,this algorithm can replan a optimum path of the rest paths after the traffic condition in the sudden.
C13 NMR Spectrum Analysis of Perfluoro Polyethers (PFPE) of Fluorocarbon-Based Magnetic Fluid’s Base Liquid
Authors: Cui Hong Chao , Li De Cai , Liu Peng
Published: November 2011

The physical and chemical properties of nanofluorocarbon-based magnetic fluids are deeply affected by the introduction of fluorinated base liquid. In this paper, firstly we introduce the concept, composition and classification of nanofluorocarbon-based magnetic fluids, then we discuss the properties, preparation and structure of perfluoro polyethers (PFPE); afterwards we analyze the NMR spectrum to infer the structure contained in the polymer in detail and systematically, further verify the functional group of PFPE.
Surface Modification Induced by Femtosecond Laser Pulses in Lithium Niobate
Authors: Chen Hong Yun , Wan Zhen Zhu , Han Yan Ling
Published: November 2011

The interaction between femtoseocnd laser and transparent materials has been studied intensively in recent years. When the femtosecond laser was focused onto the surface of the transparent materials, if the laser fluence applied to the sample exceeds the material’s fluence threshold, ablation occurs. In this paper, we study the surface ablation of lithium niobate by femtosecond laser. We produced a two-dimensional array of voids in the sample surface by varying the number of shots and laser energy, and analyze of the damage depth with the relation to the pulse energy and the number of the pulse. It has important reference on the microfabrication in such materials by femtosecond laser.
Effect of Biological Organic Fertilizer on Plant Growth and Yield of Chinese Kale
Authors: Song Shi Wei , Li Hai Da , Chen Ri Yuan , Sun Guang Wen , Liu Hou Cheng
Published: November 2011

A substrate culture experiment was conducted to study the effect of different biological organic fertilizer levels (control: zero fertilization, low level, medium level and high level) on plant growth and yield of Chinese kale (Brassica alboglabra Bailey). Results showed that compared with control, treatments of medium and high fertilization increased the leaf number, plant height, stem diameter, yield and plant dry matter of Chinese kale. Thus they promoted plant growth. The fertilizer utilization ratio of Chinese kale was the lowest for low fertilization treatment, and it was the highest for medium fertilization treatment, while it was decreased for high fertilization treatment. The treatment of medium level fertilization (30g/plant) promoted plant growth and increased the yield of Chinese kale; also it had the highest fertilizer use efficiency. So it was the appropriate organic fertilization amount for Chinese kale production.
The Photoelastic Analysis of Stress Intensity Factor for Cracks around a Tunnel
Authors: Wang Meng , Zhu Zhe Ming , Liu Jiang Hui
Published: November 2011

Rock bursts are a main geologic hazard in underground engineering processes, such as mining engineering and tunnel excavation, so it has become an important subject for many researchers and engineers. Photoelasticity, which is a nondestructive, whole-field and graphic stress-analysis experimental technique, is widely used for 2-D and 3-D analysis for getting the information of principal stress difference and principal stress direction of samples. In this paper, the effect of the position and orientation of cracks, which is situating inside the surrounding rock mass of a tunnel, on stress intensity factor (SIF) is analyzed. The results show that crack orientations and the load conditions of tunnel affect stress intensity factors significantly.
Modified Activated Carbon for Gas Phase Synthesis of Dimethyl Carbonate
Authors: Li Rui
Published: November 2011

Study of activated carbon (AC) activator modified type, bore temperature, the ratio of the response activity. Optimized modified conditions: activator of CuCl2, a temperature of 800 °C, the AC activator ratio of 1:1. AC carrier prepared by reaming modified copper catalyst activity than the non-reaming significantly increased activity in the evaluation of typical conditions, the methanol conversion rate of 34.6%, DMC selectivity was 96.4%, DMC space-time yield was 221.1g / (kgcat • h). CuCl2 activation of AC in the pore distribution of modified ratio of 98%, mainly between the 2 ~ 3nm. Pore ​​structure of the catalyst carrier has a significant effect on the activity, a larger proportion of the pore size distribution and pore size of about 2.5 nm in the AC carrier is conducive to the dispersion of active components and oxidative carbonylation catalytic activity increased.
Process Parameters Optimization on Ultrahigh Pressure Extraction of Pesticide Residues in Vegetables
Authors: Xu Ze Min , Sun Yu Jing
Published: November 2011

In order to simplify the pretreatment process in detection of pesticide residues in vegetables and improve the extraction recovery, an ultrahigh pressure technique was adopted in pretreatment experiments on organophosphorus pesticide residues in cabbage, and on the basis of single-factor test, orthogonal pre-conditions were optimized. The results showed that: The optimum process conditions for ultrahigh pressure extraction of dimethoate in cabbage at room temperature are: pressure of 400MPa, extraction solvent volume of 60ml, the holding time of 4min, recovery rate up to 91.3%, compared with the conventional homogenization method, extraction efficiency improved significantly.
Fabrication and Properties of Short-Stripe Insulation Wall in a FED Panel
Authors: Ma Yan Xia
Published: November 2011

With simple screen-printing method, the short-stripe insulation wall was fabricated. In the manufacture course, the insulation slurry was printed on the cathode glass plate surface. After the sintering process, the short-stripe insulation wall with better insulation performance would be formed. For the field emission display panel, the short-stripe insulation wall mainly possessed good separation action and support function, which not only was profitable for the subsequent panel exhausting, but also its simple fabrication process was also confirmed. Using carbon nanotube as field emitters, the field emission display panel was developed, which showed good field emission properties, such as good uniformity and image display function.
Analysis and Achievement of the Leak Detection of High Vacuum System on Magnetron Sputtering Equipment
Authors: Feng Jin Chun , Huang Song He , Su Min
Published: November 2011

Since the reform and opening, China's economy has achieved remarkable results, for various industries have developed rapidly. After 2 decades, 1950s and 1990s, China's vacuum industry also has get dramatic development and vacuum equipments have been widely applied in the electronics industry, especially in the semiconductor and integrated circuit production. This paper described the detection process and method of high vacuum magnetron sputtering equipment, utilized the one-by-one elimination to determine the key emphasis in work and succeeded in finding the cause of the substantial decline in the vacuum degree, then elaborated the results and effectiveness of detection, and finally made a conclusion. This paper has a referential significance on the maintenance of the same kind equipment.
Study of Vice-Steering Control System for Training Car
Authors: Zhang Wei Chun , Ma Bing Bing , Du Xian Bin , Pei Bao Hao , Chen Jie
Published: November 2011

Based on analyzing the structure and dynamic characteristics of this system, a dynamical mathematical model is established. To overcome the problems when using fuzzy controller or PID controller respectively and increase precision, a P-fuzzy-PID mode controller and a fuzzy PID controller is designed to control the system. The module of simulink which is a part of MATLAB is used to construct a monolithic mould. The fuzzy logic toolbox is used to construct a fuzzy mould. The results of simulation show that the performance of control becomes better by using this design.
Optimization for Heat Treatment Process of Supercritical Material F92Steel
Authors: Ding Jian Sheng , Liu Lin Xun , Feng Jin Chun
Published: November 2011

The supercritical material F92 steel is regarded as the research object, and the influence law of heat treatment process on its tissue and properties is analyzed. The results show that when the temperature of heat treatment quenching and tempering is too low, a large number of alloying elements cannot be fully integrated into the austenite, and the optimal obdurability of F92 steel is still not fully exploited; while too high temperature of heat treatment quenching and tempering will weaken the strength, plasticity and toughness. When F92 steel is processed by heating quenching at 1050 °C and tempering at 680 °C, its tissue is the smaller tempered lath martensite. The carbide is precipitated, generating precipitation strengthening, which gives it a high rupture strength and toughness. F92 steel is with high mechanical properties when heating quenched at 1050 °C and tempered 680 °C.