bluuebunny/crossref_metadata_2025 huggingface dataset:
Low temperature synthesis of CuGeO3nanoflowers from n-heptane solvent
Authors: Pei L. Z. , Yang Y. , Yang L. J. , Tao X. X. , Fan C. G. , Yuan C. Z. , Zhang Q.-F.
Published: February 2012

CuGeO3nanoflowers have been synthesized by solvothermal treatment of GeO2and Cu(CH3COO)2· H2O in n-heptane solvent without using any surfactants. The influence of temperature and reaction time on the formation of the CuGeO3nanoflowers has been analyzed. The room temperature photoluminescence spectrum of the CuGeO3nanoflowers has also been investigated. The synthesized nanoflowers are composed of orthorhombic phase, based on X-ray diffraction and scanning electron microscopy characterizations. The temperature and reaction time have important roles in the formation and size of the CuGeO3nanoflowers. The room temperature photoluminescence spectrum of the CuGeO3nanoflowers demonstrates strong blue light emission centered at 421 nm and 488 nm and a poor green light emission centered at 530 nm and 543 nm, suggesting that the CuGeO3nanoflowers have good optical properties.
The role of polymethylhydrosiloxane in the sol-gel synthesis of high surface area porous silicon carbide
Authors: Wang Dong-Hua , Fu Xin , Jin Guo-Qiang , Guo Xiang-Yun
Published: February 2012

High surface area porous silicon carbide was synthesized via a modified sol-gel method. In the sol-gel method, furfuryl alcohol and tetraethoxysilane were used respectively as carbon and silicon precursors, polymethylhydrosiloxane (PMHS) was employed as a pore-adjusting agent for preparing a carbonaceous silica xerogel. SiC was obtained by the carbothermal reduction of the carbonaceous silica xerogel at 1 300 °C in argon flow and then purified by removing excess silica, carbon and other impurities. Depending on the amount of PMHS added in the sol-gel process, the SiC products are found to have high specific surface area ranging from 120 to 167 m2 g−1 and pore volume ranging from 0.49 to 1.01 cm3 g−1. It is therefore suggested that PMHS enhances the production of mesoporous pores in the SiC products.
Effect of Ce content on the microstructure of semisolid Mg-10Al alloy
Authors: Zhang Liang , Zhang Tao , Cao Zhan-Yi , Liu Yong-Bing
Published: February 2012

Mg-10Al-xCe (x = 0 – 1.0 wt.%) alloys were prepared using metal mould casting, and the effects of Ce content on the microstructures of semisolid Mg-10Al alloys produced via isothermal heat treatment were investigated. The results show that the solid particles in the semisolid Mg-10Al alloy without Ce addition are smaller and more spherical than those in the alloys with Ce addition. Furthermore, among the semisolid Mg-10Al-0.25Ce, Mg-10Al-0.5Ce and Mg-10Al-1.0Ce alloys, the best rheological parameters are obtained for the 0.5 % Ce containing alloy. The optimum isothermal temperature and time for Mg-10Al-0.5Ce alloy are 560 °C and 20 min, respectively. The main phases in the as-cast alloys are α-Mg, β-Mg17Al12 and Al4Ce. The formation of Al4Ce phases decreases the content of β-Mg17Al12, and these Al-Ce phases at the grain boundaries restrict grain growth. Furthermore, the addition of Ce decreases the undercooling in front of the α-Mg tip which makes the α-Mg dendrites more developed. These microstructure changes with Ce addition in the as-cast state greatly influence the transformation of semisolid microstructure during isothermal heat treatment.
Spontaneous resolution of a Chiari malformation Type I and syrinx after supratentorial craniotomy for excision of a cavernous malformation
Authors: Miele William R. , Schirmer Clemens M. , Yao Kevin C. , Heilman Carl B.
Published: February 2012

The pathogenesis of Chiari malformation Type I (CM-I) and associated syringomyelia is incompletely understood. Patients often present in middle age with incidental or minimally symptomatic CM-I, whose management is controversial. One option is clinical and radiographic observation of asymptomatic and minimally symptomatic patients. The authors here present the case of a 36-year-old woman who had been monitored for 6 years for a minimally symptomatic CM-I and cervicothoracic syrinx. After 5 years of follow-up, she suffered spontaneous rupture of a cerebral cavernous malformation when she was 27 weeks pregnant. The ruptured cavernous malformation and hematoma were operatively managed via a right frontal craniotomy. Ten months after the craniotomy for resection of the ruptured cavernous malformation, follow-up MRI demonstrated resolution of the CM-I and syrinx. Few similar cases have been reported in adults. This case argues for the presence of dynamic factors in the development and maintenance of CM-I and supports the nonoperative treatment of asymptomatic and minimally symptomatic patients.
Minimum clinically important difference in pain, disability, and quality of life after neural decompression and fusion for same-level recurrent lumbar stenosis: understanding clinical versus statistical significance
Authors: Parker Scott L. , Mendenhall Stephen K. , Shau David N. , Adogwa Owoicho , Anderson William N. , Devin Clinton J. , McGirt Matthew J.
Published: February 2012

Object

Spine surgery outcome studies rely on patient-reported outcome (PRO) measurements to assess treatment effect, but the extent of improvement in the numerical scores of these questionnaires lacks a direct clinical meaning. Because of this, the concept of a minimum clinically important difference (MCID) has been used to measure the critical threshold needed to achieve clinically relevant treatment effectiveness. As utilization of spinal fusion has increased over the past decade, so has the incidence of same-level recurrent stenosis following index lumbar fusion, which commonly requires revision decompression and fusion. The MCID remains uninvestigated for any PROs in the setting of revision lumbar surgery for this pathology.

Methods

In 53 consecutive patients undergoing revision surgery for same-level recurrent lumbar stenosis–associated back and leg pain, PRO measures of back and leg pain were assessed preoperatively and 2 years postoperatively, using the visual analog scale for back pain (VAS-BP) and leg pain (VAS-LP), Oswestry Disability Index (ODI), Physical and Mental Component Summary categories of the 12-Item Short Form Health Survey (SF-12 PCS and MCS) for quality of life, Zung Depression Scale (ZDS), and EuroQol-5D health survey (EQ-5D). Four established anchor-based MCID calculation methods were used to calculate MCID (average change; minimum detectable change; change difference; and receiver operating characteristic curve analysis) for 2 separate anchors (health transition index of the SF-36 and the satisfaction index).

Results

All patients were available for 2-year PRO assessment. Two years after surgery, a significant improvement was observed for all PROs assessed. The 4 MCID calculation methods generated a range of MCID values for each of the PROs (VAS-BP 2.2–6.0, VAS-LP 3.9–7.5, ODI 8.2–19.9, SF-12 PCS 2.5–12.1, SF-12 MCS 7.0–15.9, ZDS 3.0–18.6, and EQ-5D 0.29–0.52). Each patient answered synchronously for the 2 anchors, suggesting both of these anchors are equally appropriate and valid for this patient population.

Conclusions

The same-level recurrent stenosis surgery-specific MCID is highly variable based on calculation technique. The “minimum detectable change” approach is the most appropriate method for calculation of MCIDs in this population because it was the only method to reliably provide a threshold above the 95% confidence interval of the unimproved cohort (greater than the measurement error). Based on this method, the MCID thresholds following neural decompression and fusion for symptomatic same-level recurrent stenosis are 2.2 points for VAS-BP, 5.0 points for VAS-LP, 8.2 points for ODI, 2.5 points for SF-12 PCS, 10.1 points for SF-12 MCS, 4.9 points for ZDS, and 0.39 QALYs for EQ-5D.
A New Strategy for the One Pot Synthesis of (Aryloxyimino)Ethylcoumarins Promoted by CuCl2
Authors: Pal Gargi , Bhattacharyya Pranabes , Medda Arunima , Das Asish R.
Published: February 2012

Cupric chloride showed efficient catalytic activity for the cross coupling reaction of arylboronic acids and (hydroxyi mino)ethylcoumarins at room temperature in the presence of NEt3 as base. A simple and convenient protocol for the synthesis of O-aryloxime ethers having the highly base sensitive coumarin nucleus is reported. O-Aryloxime ethers are important as they provide access to scaffolds for the generation of various biologically active compounds. They are potential precursors to benzofurans and benzisoxazoles.
Synthesis of Asymmetric Semicarbazides using a Coumarin Ring
Authors: Chai Lan-Qin , Zhang Hong-Song , Zhang Yu-Li , Cui Kai
Published: February 2012

A series of asymmetric semicarbazides were synthesised using 3-coumarin isocyanate, which was prepared from 3-coumarinyl azide by Curtius rearrangement, with acid hydrazides under microwave irradiation using a one-pot procedure. This method has the advantages of mild conditions, easy handling and high yields. The products, which have been characterised by analytical and spectral data, have many medicinal and agrochemical applications.
An Efficient Three-Component Synthesis of Homoallylic Amines Catalysed by MgI2 etherate
Authors: Wang Yanping , Liu Yingshuai , Hu Shenghui , Zhang Xingxian
Published: February 2012

A three-component reaction of aldehydes, amines and allyltributylstannane was efficiently carried out to afford the corresponding homoallylic amine derivatives in the presence of 20 mol% of MgI2 etherate [(MgI2*(OEt2) n] under mild and neutral reaction conditions in good to excellent yields.
Iron Nanoparticle-Promoted Cu (I)-Catalysed Homocoupling of Arylmethyl Halides for the Synthesis of 1,2-diarylethanes
Authors: Shekarriz Marzieh , Adib Mehdi , Biabani Tayebe , Taghipoor Sohrab
Published: February 2012

Carbon–carbon bond formation is important in organic synthesis for the preparation of natural products, organic materials and polymers and so on. An efficient and mild reductive homocoupling of arylmethyl halides is now described. Treatment of various benzylic halides in the presence of zero valent iron nanoparticles (nZVI) and a catalytic amount of CuBr in air and water at room temperature afforded 1,2-diarylethanes in excellent yields.
Pd-Catalysed One-Pot Synthesis of 2H-1,4-benzoxazin-3-(4H)-ones from o-halophenols and 2-chloroacetamides
Authors: Yin Fangling , Feng Gaofeng , Song Qingbao , Qi Chenze
Published: February 2012

A Pd-catalysed cascade protocol, consisting of intermolecular O-alkylation and spontaneous intramolecular amidation, has been established for efficient synthesis of 2 H-1,4-benzoxazin-3-(4 H)-ones from o-halophenols and 2-chloroacetamides. A varity of substrates afford the desired products in good to excellent yields. It is particularly attractive for synthesis of a library of 2 H-1,4-benzoxazin-3-(4 H)-ones.
First Total Synthesis of Two New Amide Alkaloids from Piper boehmeriaefolium
Authors: Shan Shao-Jun , Zhang Hong , Wang Xiao-Dan
Published: February 2012

3-(3,4,5-Trimethoxyphenyl)propanoylpyrrole and 3-(3,5-dimethoxy-4-hydroxyphenyl)propanoylpyrrole, two new amide alkaloids, were prepared from 3,4,5-trimethoxybenzaldehyde via 3,4,5-trimethoxycinnamic acid and the corresponding dihydroacid. This route is simple and the reaction conditions are mild.
Quantitative Comparison of Conformational Ensembles
Authors: Wolfe Kevin C. , Chirikjian Gregory S.
Published: February 2012

A number of measures have been used in the structural biology literature to compare the shapes or conformations of biological macromolecules. However, the issue of how to compare two ensembles of conformations has received far less attention. Herein, the problem of how to quantitatively compare two such ensembles is addressed in several different ways using concepts from probability and information theory. Ultimately, such metrics could be used in the evaluation of structure-prediction algorithms and the analysis of how conformational mobility is inhibited by bound ligands.
The mTOR Signalling Pathway in Human Cancer
Authors: Pópulo Helena , Lopes José Manuel , Soares Paula
Published: February 2012

The conserved serine/threonine kinase mTOR (the mammalian target of rapamycin), a downstream effector of the PI3K/AKT pathway, forms two distinct multiprotein complexes: mTORC1 and mTORC2. mTORC1 is sensitive to rapamycin, activates S6K1 and 4EBP1, which are involved in mRNA translation. It is activated by diverse stimuli, such as growth factors, nutrients, energy and stress signals, and essential signalling pathways, such as PI3K, MAPK and AMPK, in order to control cell growth, proliferation and survival. mTORC2 is considered resistant to rapamycin and is generally insensitive to nutrients and energy signals. It activates PKC-α and AKT and regulates the actin cytoskeleton. Deregulation of multiple elements of the mTOR pathway (PI3K amplification/mutation, PTEN loss of function, AKT overexpression, and S6K1, 4EBP1 and eIF4E overexpression) has been reported in many types of cancers, particularly in melanoma, where alterations in major components of the mTOR pathway were reported to have significant effects on tumour progression. Therefore, mTOR is an appealing therapeutic target and mTOR inhibitors, including the rapamycin analogues deforolimus, everolimus and temsirolimus, are submitted to clinical trials for treating multiple cancers, alone or in combination with inhibitors of other pathways. Importantly, temsirolimus and everolimus were recently approved by the FDA for the treatment of renal cell carcinoma, PNET and giant cell astrocytoma. Small molecules that inhibit mTOR kinase activity and dual PI3K-mTOR inhibitors are also being developed. In this review, we aim to survey relevant research, the molecular mechanisms of signalling, including upstream activation and downstream effectors, and the role of mTOR in cancer, mainly in melanoma.
Gen-2 Hand-Held Optical Imager towards Cancer Imaging: Reflectance and Transillumination Phantom Studies
Authors: Gonzalez Jean , Roman Manuela , Hall Michael , Godavarty Anuradha
Published: February 2012

Hand-held near-infrared (NIR) optical imagers are developed by various researchers towards non-invasive clinical breast imaging. Unlike these existing imagers that can perform only reflectance imaging, a generation-2 (Gen-2) hand-held optical imager has been recently developed to perform both reflectance and transillumination imaging. The unique forked design of the hand-held probe head(s) allows for reflectance imaging (as in ultrasound) and transillumination or compressed imaging (as in X-ray mammography). Phantom studies were performed to demonstrate two-dimensional (2D) target detection via reflectance and transillumination imaging at various target depths (1–5 cm deep) and using simultaneous multiple point illumination approach. It was observed that 0.45 cc targets were detected up to 5 cm deep during transillumination, but limited to 2.5 cm deep during reflectance imaging. Additionally, implementing appropriate data post-processing techniques along with a polynomial fitting approach, to plot 2D surface contours of the detected signal, yields distinct target detectability and localization. The ability of the gen-2 imager to perform both reflectance and transillumination imaging allows its direct comparison to ultrasound and X-ray mammography results, respectively, in future clinical breast imaging studies.
Sunlight Intensity Based Global Positioning System for Near-Surface Underwater Sensors
Authors: Gómez Javier V. , Sandnes Frode E. , Fernández Borja
Published: February 2012

Water monitoring is important in domains including documenting climate change, weather prediction and fishing. This paper presents a simple and energy efficient localization strategy for near surface buoy based sensors. Sensors can be dropped randomly in the ocean and thus self-calibrate in terms of geographic location such that geo-tagged observations of water quality can be made without the need for costly and energy consuming GPS-hardware. The strategy is based on nodes with an accurate clock and light sensors that can regularly sample the level of light intensity. The measurements are fitted into a celestial model of the earth motion around the sun. By identifying the trajectory of the sun across the skies one can accurately determine sunrise and sunset times, and thus extract the longitude and latitude of the sensor. Unlike previous localization techniques for underwater sensors, the current approach does not rely on stationary or mobile reference points.
Robust Kernel-Based Tracking with Multiple Subtemplates in Vision Guidance System
Authors: Yan Yuzhuang , Huang Xinsheng , Xu Wanying , Shen Lurong
Published: February 2012

The mean shift algorithm has achieved considerable success in target tracking due to its simplicity and robustness. However, the lack of spatial information may result in its failure to get high tracking precision. This might be even worse when the target is scale variant and the sequences are gray-levels. This paper presents a novel multiple subtemplates based tracking algorithm for the terminal guidance application. By applying a separate tracker to each subtemplate, it can handle more complicated situations such as rotation, scaling, and partial coverage of the target. The innovations include: (1) an optimal subtemplates selection algorithm is designed, which ensures that the selected subtemplates maximally represent the information of the entire template while having the least mutual redundancy; (2) based on the serial tracking results and the spatial constraint prior to those subtemplates, a Gaussian weighted voting method is proposed to locate the target center; (3) the optimal scale factor is determined by maximizing the voting results among the scale searching layers, which avoids the complicated threshold setting problem. Experiments on some videos with static scenes show that the proposed method greatly improves the tracking accuracy compared to the original mean shift algorithm.
A CAD Modeling Method of Dental Surface Based on Scanning Data
Authors: Fan Li Cheng , Zhang Feng Feng
Published: February 2012

The measurement of the teeth surface and the CAD modeling of the point cloud data are the key basics for the following CNC machining, and the complete data can only be obtained through multi-perspective scanning method. Using ICP iteration algorithm that based on point-to-line to the multi-perspective scanning data, specific to the features of layering scanning, retrograde the 3D data registration to 2D planar registration, and provide the cutting and splicing algorithm for registered tooth data, obtain precise and integrated tooth surface point cloud data, which serves as the CAD model for the following CNC machining.
Optimization of Sensor Placement in SHM Based on the Dual Coded Genetic Algorithm
Authors: Yang Jian Xi , Zhang Li Wen
Published: February 2012

This paper uses of the dual structure of coded genetic algorithm to optimize the sensor placement methods. The method using the optimal preservation strategy using the adaptive part of the cross, overcomes deficiencies of computer applying to the lengthy large-scale structure data, storage space, and to ensure that the optimal solution search. Finally, through the analysis of a continuous rigid frame bridge Project, proved that the method superior to the effective independent method in the search capability, computational efficiency and reliability, but still need to further improve the speed of convergence.
Research on Web-Based Elastohydrodynamic Lubrication Oil Theory of Rolling Bearing Type Planetary Friction Transmission Mechanism
Authors: Zhao Jin Zhi , Liu Yuan Tao , Zhao Ze Xiang
Published: February 2012

Service mode and dynamic network interfere techniques are analyzed. An elastohydrodynamic lubrication oil thickness theory of rolling bearing type planetary friction transmission mechanism system based on web is presented.Elastohydrodynamic lubrication theory is adopted in rolling bearing type planetary friction transmission mechanism in this paper. Research indicates that elastohydrodynamic oil file lubrication can be realized while mechanical parts with connection between points or lines run under certain conditions. At the same time, surface disrepair of the parts has relation to lubrication state. Minimal oil film thickness formula is deduced based on the elastohydrodynamic lubrication theory. It is a part of He’nan Scientific Committee science and technology research projects 《research on collaborative design and manufacturing technique in gear manufacturing based on network and multi-Agent》
Corrosion Behavior of BG80S Anti-Sulfur Oil Tube Steel in High Temperature High Pressure H2S/CO2 Environment
Authors: Wang Bin , Zhang Jun Ling , Bai Jiang Hu , Zhou Dong Mei , Yang Li , Shen Kun
Published: February 2012

The four-point bending method and weight loss method were used to study respectively the stress corrosion cracking behavior and weightlessness corrosion situation of the baosteel BG80S steel in the simulated field environments. The experimental results shown that BG80S won't occur to stress corrosion cracking when the maximum loading stress is 85% Rt0.5 ; the corrosion rates increase with the rising of temperature which is from 40°C to 80°C under the dynamic and static conditions of the simulated environments; the dynamic corrosion rates are between 1.5558 and 1.7523mm/a and the corrosion rates are 0.4827～1.4078mm/a under the static conditions, both of which belong to a serious corrosion category; the form of corrosion is uniform corrosion under the dynamic conditions; because the corrosion products exist micro defects under the static conditions of 80°C, the experimental samples have had the localized corrosion.
The Chaotic Characteristics of Dynamic System of Cutting Coal and Rock by Pick
Authors: Liu Chun Sheng , Li De Gen , Zhao Ying Yu , Song Yang
Published: February 2012

The complexity, nonlinear, fuzziness and dissipativity of interaction system between shearer cutting working mechanism and coal lead cutter cutting load to have obvious characteristic of uncertainty. Quantitative description and chaotic characteristics of cutting resistance curves are studied by application of the fractal and chaos theory; the conditions of coal leap damage are given according to the relation curves between stress and strain of coal, fractal damaged stiffness of coal. From the angle of chaos and fractal, mathematical relations between cutting evaluation index of cutting drive system and chaotic state of system evolution are given; the mathematical model of cutting drive system is found. By simulation, the results show the phase locus has time ergodicity and chaotic characteristic with cutting drive system in different bifurcation parameters, realizing the simulation of chaotic simulating load signal; cutting drive system properties have important significance to develop efficient cutting working mechanism.
Development of a Cold Spraying System for Fabricating Hydroxyapatite Coating
Authors: Zhang Lei , Zhang Wen Tao , Li Hu Qiang , Geng Wei Qiang , Bao Yong Ji
Published: February 2012

A novel cold spraying system for fabricating hydroxyapatite coatings on titanium and titanium alloy substrates is introduced in this paper. A description of the system components is presented. It is expected that the system could provide an effective method to improve deposition efficiency and compactness of hydroxyapatite coating. The addition of substrate heater helps to create dense and adherent coatings. It is found that the system could make feedstock hydroxyapatite particles be accelerated to high impact velocity. Hydroxyapatite coatings that preserve the chemical composition and microstructure of feedstock hydroxyapatite powders are obtained.
Simulation for the Bird-Strike Damage of Drone Radome Composite Structure
Authors: He Yan Bin , Yao Xiao Hu , Liu Xuan , He Ling Feng
Published: February 2012

The low and medium speed bird-strike impact damage of sandwich composite structure of drone radome during takeoff and landing is examined by numerical simulations, using nonlinear dynamic finite element analysis software LS-DYNA. For different impact velocities, the aircraft radome’s dynamic responses are obtained and the damage in composite panel is clearly demonstrated. The relations of impact energy, maximum impact force and the damage state are analyzed. The simulation results can provide some references for the aircraft radome design.
Dielectric Properties of Sol-Gel Derived MgAl2O4 Thin Films
Authors: Tseng Ching Fang , Hsu Cheng Hsing , Lai Chun Hung
Published: February 2012

This paper describes microstructure characteristics of MgAl2O4 thin films were deposited by sol-gel method with various preheating temperatures and annealing temperatures. Particular attention will be paid to the effects of a thermal treatment in air ambient on the physical properties. The annealed films were characterized using X-ray diffraction. The surface morphologies of treatment film were examined by scanning electron microscopy and atomic force microscopy. At a preheating temperature of 300oC and an annealing temperature of 700oC, the MgAl2O4 films with 9 μm thickness possess a dielectric constant of 9 at 1 kHz and a dissipation factor of 0.18 at 1 kHz.
Preparation of a Novel Viscosifier for Drilling Fluid by Sulfonation Technology Based on the Enriched Organic Compounds in TNT Red Water
Authors: Wei Fang Fang , Zhang Yi He , Lv Feng Zhu
Published: February 2012

In this paper, sulfonates based on the enriched organic compounds in TNT red water have been prepared and their efficacy in water based drilling mud has been evaluated. The experimental results showed that the sulfonated products can be used as viscosifier for drilling fluid, which suggesting an attractive method for the possible commercial usage of waste red water.
Synthesis of Self-Stratifying Polyacrylate Latex Containing Silicon
Authors: Li Yu Feng , Wang Hong Chao , Xiang Zhong Yuan , Gao Xiao Hui
Published: February 2012

Self-stratifying polyacrylate latex containing silicon was synthesized via semi-continuous emulsion polymerization, using organic silicon and acrylate as raw materials. Transmission electron microscope(TEM) characterization indicated that the particles were form uniform analogous core-shell structure and dynamic light scattering(DLS) analysis possessed narrow size distributions. The results of X-ray photoelectron spectroscopy(XPS) proved the propensity of silicon enrichment at film-air interface, which revealed self-stratifying phenomenon. The thermal stability of the latex films determined by thermogravimetric analysis(TGA) was increased 24 °C as the join of organic silicon.
Experimental Analysis of Micro-CHP Based on Biomass Direct-Fired Stirling Engine
Authors: Ma Da Guo , Jiang Xin Bo , Zhang Xu , Ma Yan
Published: February 2012

The working principle of the micro-CHP based on biomass direct-fired Stirling engine and the thermal energy conversion process of the biomass direct-fired fuels were analyzed. On the basis of analysis, a 1kW β-type Stirling generator was designed and constructed for lab tests. Then, experiments were carried out to evaluate the effectiveness of the prototype. Through the analysis of experimental data and simulation, the change law of charge voltage, charge current with the engine speed and pressure, as well as the relation of heat and electricity, the power generation efficiency and the overall efficiency of the thermoelectric in the working process was obtained. The results showed that biomass energy use efficiency will be improved through the use of micro-CHP based on biomass direct-fired Stirling engine.
Study on UV-Curable Polyester Acrylate/SiO2 Nanocomposite Resin
Authors: Yu Ming Guang , Chen Guang Xue , Chen Qi Feng , Huang Wen Tao
Published: February 2012

Using the hydrolysis reaction of TEOS and ethanol to prepare nano-SiO2 sol, and grafting with silane coupling agent WD-20 to introduce double bonds to make a surface modification, the nano-SiO2 sol mixed with the light-cured resin PEA, reactive diluents TPGDA and photoinitiators 1171 under ultrasonicto after dried concentration in vacuum oven, then the composite resin gotten was characterized through FTIR, TGA, UV-Vis and particle size analysis. The results showed as follows: the light-cured resin modified by nano-SiO2 with WD-20 was better in dispersion and stability, and durability, abrasion resistance and other performances of the coating improved significantly which broadened the application range of light-cured resin.
Thermopiezoelectric Response of a One-Dimensional Functionally Graded Piezoelectric Medium to a Moving Heat Source - A Review
Authors: Chen Zeng Tao , Akbarzadeh Hamid , Babaei Hossein
Published: February 2012

The multi-physics of piezoelectric materials under different environmental conditions has been an active research subject for a few decades. Particularly, the thermoelastic behaviour of smart materials and structures is of great importance to their reliability in different applications. Traditionally, the Fourier heat conduction theory was introduced in dealing with the thermoelastic reactions of smart materials and structures. This may lead to reasonable analyses and useful guidelines in design of smart structures, especially when no severe thermal gradient is involved. However, when a severe thermal gradient is indeed involved in the service environment of a smart structure, the analysing results based on the Fourier heat conduction theory is unrealistic and usually rendered useless. Non-Fourier heat conduction theories have been introduced in the thermoelastic analysis of smart materials and structures in recent years and resulted in reasonable results. In this paper, we review the recent results of a thermopiezoelectric problem of a one-dimensional (1-D), finite length, functionally graded medium excited by a moving heat source using both the Fourier and Non-Fourier heat conduction theories. Numerical examples are displayed to illustrate the effects of non-homogeneity index, length and thermal relaxation time on the results.
An Effective Routing Algorithm for Dynamic Shared Path Protection in ASON
Authors: Du Li , Yan Yong Xia , Jiang Li Ming
Published: February 2012

This paper proposed an efficient online algorithm, called JPS-SR, for shared path protection under dynamic traffic conditions in GMPLS. The algorithm was improved by introducing the set ve, parameter α and ε, which reduced average hops of paths, and increased utilization of resources. The performance of JPS-SR was evaluated via simulation with FIR based on SPS (SPS-FIR) on a typical network (NSFNet). The simulation results show that JPS-SR can optimize the resource utilization and blocking probability.
Modal Analysis of the Gantry Milling and Boring Machine Tool Beam Based on FEM
Authors: Cao Zhong Liang , Ding Yan , Hu Qing Ming , Guo Qiang
Published: February 2012

Fixed beam gantry for large CNC boring and milling machine to bear the beams on the rail side apron, and other parts ram weight under weight and size of deformation produced a result of the assembly accuracy of less than standard, use three-dimensional modeling software UG and finite element analysis software ANSYS for dynamic beam gantry milling machine CNC beam three-dimensional modeling and modal analysis, based on weight and apron beams, the weight of ram and other components in relative deformation amplitude, and the gantry milling machine processing characteristics and overall design of the structural characteristics of machine tools, assembly of the beam is proposed to note some issues and some ways to solve the assembly size requirements, through finite element analysis of the deformation and comparing the actual measured value, the experiment proved data on-site assembly solution with a good theoretical support.
Creep Tests Research on a New Zirconium Alloy for Nuclear Fuel Cladding Tubes
Authors: Meng Xin Ming , Xue Fei , Yu Wei Wei , Guo Hong Mei
Published: February 2012

Hoop creep tests and axial creep tests were carried out on a new zirconium alloy for nuclear fuel cladding tubes at 375 °C. The result indicated that the proportion of the second creep stage decreased as the stress increasing, meanwhile, the steady-state creep rate increased in both creep test modes. However, the ability of creep rupture resistance in the hoop direction is more strengthen than that in axial direction. The SEM analysis showed that the creep fracture was mainly dimple toughness fracture. The dimple for low stress was intensive and small. The fitting curve by the θ function was well coincided with the test data, so the creep life can be analyzed by θ function.
The Contact Simulation of CTP Imaging Drum and Plate on ANSYS
Authors: Xing Jie Fang , Zhang Jie , He Lu Jun
Published: February 2012

Introduce some basic knowledge, methods and theory of using the finite element software ANSYS to carry out contact analysis, and then establish the contact simulation analysis finite element model for CTP imaging drum and plate by using the software ANSYS. A numerical simulation analysis on the imaging drum and the plate indicates that the analysis results are consistent with the experimental results, so as to lay the foundation for the reliability and stability of dynamic design and optimization design of CTP imaging drum.
Study on Software Vulnerability Discovering Based on Linux Sequence of System Call
Authors: Wang Chong , Song Guang Jun , Zhao Chun Lan
Published: February 2012

Considering the efficiency problem of software vulnerability discovering in Linux system, a new software vulnerability discovering in Linux system program with data mining algorithm is proposed in this paper. An improved REL algorithm based on one-dimensional linked list is proposed, and mining on Linux sequence data of system call with REL algorithm, then we do analysis and detection of software vulnerabilities. A model of software vulnerability discovering analysis system with LRE algorithm was designed. Finally, experimental results show the validity of mining on Linux sequence data of system call with REL algorithm in terms of reducing the false alarm rate, and improving the efficiency of software security vulnerability discovering.
The Research of a Multi-Language Supporting Description-Oriented Clustering Algorithm on Meta-Search Engine Result
Authors: Ren Wu Ling , Liu Li Juan
Published: February 2012

Search engine has adopted a variety of techniques to improve the accuracy of information retrieval, but the way of a linear list of search engine results, which mixes unrelated documents with relevant documents, has brought user great burden. This article commits to build clustering of search results, which is based on meta search engine techniques. We use all the popular search engine as a data source, then after a certain pre-processing of the source search engine, hierarchical clustering results is formed and returned to the query users. we propose a multi-language supporting, label first clustering algorithm, which we named DCFC algorithm. This algorithm supports both Chinese and English query, focuses on generating human readable labels, shows search results in hierarchical structure.
A Recommendation System Framework Based on Web Mining
Authors: Yang Zhen Jian , Xia Ke Wen
Published: February 2012

Presently recommendation systems have gradually become an important part in E-Commerce, more and more research papers about recommendation systems in E-Commerce appeared in many kinds of conferences and journals. With expanding of E-Commerce it also faces series of challenges. Traditional collaborative filtering recommendation technique is hard to provide recommendation service for unregistered users. To overcome this problem, we suggested a framework of recommendation system based on web mining. It is made up of two parts, offline and online. This method first clustered web usage data, web content data and web structure data respectively, then provided high-quality recommendation services based on mining results. Compared with traditional collaborative filtering techniques, recommendation systems based on web mining are convenient for users because user need not to provide user-rating data explicitly. In end of this paper, accuracy of recommendation system based on web mining was tested and compared with traditional collaborative filtering recommendation system. Testing results showed that, quality of recommendation system based on web mining is better than quality of traditional collaborative filtering recommendation system.
Performance Analysis of a Simple Power Saving Scheme for Energy Efficient Ethernet
Authors: Jin Shun Fu , Fan Rong Yu , Chen Li
Published: February 2012

In order to improve the energy efficiency and build a green Ethernet, we propose a simple power saving (SPS) scheme with a burst transmission for Energy Efficient Ethernet. In SPS scheme, let the link transfer to the sleep mode as soon as no packets are ready for transmission, whereas let the link return to the awake mode when a fixed number of packets arrive during the sleep mode. We build a vacation queueing model with N strategy to describe the working principle of SPS scheme. By using the method of embedded Markov chain, the formulas of performance measures are given. Finally, numerical results are provided to show the impact of traffic load on system performance.
A Global Stereo Matching Algorithm Based on Adaptive Support-Weight and Graph Cut
Authors: Yu Guo He , Liu Jian Ming , Xie Xu Sheng , Zeng Ji Guo
Published: February 2012

For the stereo matching problem in the non-texture, occluded and depth discontinuity regions, a new stereo matching algorithm that based on the adaptive support-weight of Graph Cuts is proposed. It can reduce the matching error in the depth discontinuity and non-texture regions by the single adaptive support-weight matching methods. The occlusion and smoothness penalty is considered by building the energy function. The experimental results show that the proposed algorithm can achieve more precise and reliability matching.
Application of Intelligence Fusion Algorithm in Path Optimization Problem
Authors: Wang Shi Gang , Wang Yu Juan , Wu Guan Xiong , Fu Yi Li
Published: February 2012

In CAD/CAM integration system, the problem of the path optimization to be thorough researched. Through numerical describe of information elements, by using graph theory of traveling salesman problem，set up the mathematical model of path optimization problem. Based on ant colony algorithm and lin-kernighan (LK) algorithm, an intelligence fusion algorithm is put forward. With group of holes processing as an example, the group of holes drilling tool path of optimized, and realize the CAD/CAM many features of optimization, which greatly improve the processing precision and efficiency.
A Novel Edge Detection Algorithm for Medical Image
Authors: Ma Zhan Chun , Ning Xiao Mei
Published: February 2012

CANNY operator had widely usage for edge detection; however it also had certain deficiencies. So the traditional CANNY operator about this is improved and puts forward a kind of new algorithm used for image edge detection. Compared improved algorithm with traditional algorithm for edge detection, simulations shows that new algorithm is more effective for image edge detection and the clearer detection result is obtained.
Method of Fault Character Extraction for Diesel Engine Based on Multivariate Time Series
Authors: Liu Yan , Yuan Wen , Li Xi Bing
Published: February 2012

On the premise of data pre-processing by principal component analysis, in this paper, the largest Lyapunov exponent and generalized correlation dimension of multivariate time series are extracted based on the multivariate reconstruction presented. Though simulation analysis of coupling Rossler system, The results indicated that the method can identified and diagnosis fault accurately for complex system dynamics. The method has been used to fault character extraction for diesel engine with satisfactory results.
A Synthetic Encryption Scheme on Attribute Granularity in the ODB Model
Authors: Wang Ning , Zhuang Hong Chao , Zhuang Shan
Published: February 2012

The improvement of cryptogram query hit rate and the reduction of redundant data in query results are the challenges in the outsourced database (ODB) model. A synthetic encryption scheme applied to the ODB is presented to solve the problem of precise query over the cryptogram. This scheme employs encryption scheme on the attribute granularity, which combines a newly k-Mapping Character-data Encryption Scheme (k-MCES) with the existing Order Preserving Encryption Scheme (OPES). The theories and experiments analysis show that queries over encrypted data with this synthetic encryption scheme can return exact results. Furthermore, this scheme is correct and safe.
A Point Dislocation Interacting with an Elliptical Hole Located at a Bi-Material Interface
Authors: Wang Xian Feng , Xing Feng , Hasebe Norio , Prasad P.B.N.
Published: February 2012

The problem of a point dislocation interacting with an elliptical hole at the interface of two bonded half-planes is studied. Complex stress potentials are obtained by applying the methods of complex variables and conformal mapping. A rational mapping function that maps a half plane with a semi-elliptical notch onto a unit circle is used for mapping the bonded half-planes. The solution derived can serve as Green’s function to study internal cracks interacting with an elliptical interfacial cavity.
Telephone Clients Management System with Short Messages
Authors: Ma Yu Chun , Li Zhuang
Published: February 2012

With the rapid development of network, the distribution system based on it is becoming more and more popularized. Telephone Clients Management System with Short Messages (TCMSSM) is used to retrieve the client information through his/her phone number which captured by the presentation of Caller ID automatically, generate orders half-automatically, and then send them to mobile phones of workers who service outdoors by SMTP. The level of distribution management is improved efficiently through this solution.
General Application Research on GSM Module
Authors: Ma Yu Chun , Huang Ying Hong
Published: February 2012

GSM network is the most worldwide mobile communication network nowadays. Based on the SIEMENS MC35 GSM module, general techniques of communication with GSM network are depicted, including the initialization of terminal equipment, sending and reading short messages (SMS), sending SMS to group users, and the management on phonebook of SIM card, furthermore, a flexible solution on real-time reading SMS is proposed. Finally, application cases are given for GSM module.
The Application of State Feedback Control in Double-Stage Vibration Isolation System
Authors: Liu Shu Yong , Yang Qing Chao , Yang Ai Bo , Deng Liang
Published: February 2012

Double-stage vibration isolation system can attenuate structure-born noise in media and high frequency band effectively, which improves the ship’s capability of concealment greatly. At the same time, this vibration control system can decrease the isolated equipment’s acceleration response while subjected to foundation shock excitation effectively. Hence ensure the isolated equipment’s acceleration response in a safety range. But the maximum displacement response of the isolated equipment will increase greatly at the same time. This requires that those flexible connecting components between the equipment and the environment should have great permitted displacement. If an auxiliary power system which can adjust the characteristics of the vibration isolations in the main system according to the vibration state is mounted on the middle mass block, it will output suitable force to attenuate the oscillation quickly to protect both the isolated equipment and the flexible connecting components under shock excitation condition. Simulation results show that this method is effective.
6-Axis Serial Robot Simulation Based on SimulationX
Authors: Zhao Si Jun , Shan Jia Yua , Bi Lu Yan
Published: February 2012

This paper presents research and simulation analysis on kinematics and dynamics problem based on the 6-axis serial robot. By means of Denavit-Hartenberg method, the robot kinematics model is established as well as and the derivation process of kinematic and inverse kinematic resolution is described in detail. Furthermore, in software simulationX, robot system model including mechanical sub-system and control sub-system are founded. Additionally, through simulation, different performances of robot are illustrated based on different trajectory planning and control. In this way a theoretical reference is provided for the further study on trajectory planning and controls of 6-axis serial robot.
Fatigue and Fracture Character of Metal Rubber Material
Authors: Li Yu Ming , Bai Hong Bai , Yang Jian Chun
Published: February 2012

The damaging factor was defined firstly, mean while the fatigue character of metal rubber was discussed. Then the relationship between damaging factor and cyclic loading times had been summarized through fatigue tests. Finally observed the pattern of fracture face, cavities and flaws of the fatigue wires inner the metal rubber components with electronic scanning microscope, some technical methods of improving the wearing resistivity of metal rubber material had been brought forward.
A Study on the Teaching Platform of Linear Vibratory Feeder
Authors: Han Liang , Yang M.M.
Published: February 2012

It is known that vibratory feeders are the most versatile of all hopper feeding devices for small engineering parts and play a key role in assembly automation. However, there are still no reliable and effective professional teaching platforms for researching or demonstrating the principle of the parts conveying. The aim of this paper is to develop an optimal teaching platform based on the analysis of the working principle that the feeder follows. The structural design, elastic system and control system are studied in this paper. The vibration principle is verified by the teaching platform through the experiment and the results are promising.
Sedimentary Facies and Evolution of early Cretaceous in the Fault Depressions, Songnan Area
Authors: Wu Ya Sheng , Zhong Da Kang , Qiu Nan Sheng , Zhang Xiao Ying
Published: February 2012

Based on the structural geology, sedimentology, palaeontology and geochemistry, the sedimentary facies and evolution patterns are developed in Songnan area from the studies of seismic data, cores, well logs, palaeontology and geochemistry. The result indicates that nearshore subaqueous fan, fan delta, braid delta and lacustrine had been developed in the fault depressions of Songnan area. From the margin to the depocenter of the basin, the sedimentary environments gradually changed from nearshore subaqueous fan, fan delta or braid delta to shore-shallow sediments and middle depth-deep lacustrine. Two stages are divided for the sedimentary evolution of Songnan area, namely the prior stage which appears with Yixian formation developing lava facies and pyroclastic facies; the other is the detrital rock facies ,which are developed from formation Jiufotang to Fuxin, is composed of nearshore subaqueous fan, fan delta, braid delta and lacustrine. Conclusion can be made that those sedimentary facies are controlled by the depth of water variation, which changed from shallow to deep, and then to shallow. Multiple source-reservoir-cap assemblage in vertical provided favourable condition for oil and gas pool forming.
Effect of Operating Conditions on Water Injector of District Heating Supply System
Authors: Zhang Kun , Zhang Bo , Shen Sheng Qiang
Published: February 2012

The effect is discussed between operating parameters of District Heat Supply System and injector geometry by calculation. It is illustrated that heat supply load affects injector geometry worst, and suction fluid temperature has great impact on injector’s area ratio, while pressure loss of system offers no effects on diffuser geometry of injector.