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Combining global features with local features is an important solution to improve discriminative performances in person re-identification (Re-ID) task.In the past,external information was used to locate regions with corresponding semantics,thus mining local information.Most of these methods are not end-to-end,so the training process is complex.To solve this problem,a multi-orientation partitioned network (MOPN) is proposed,which can effectively mine local information and combine global information with local information for end-to-end feature learning.The network has three branches:one for extracting global feature and two for mining local information.Without relying on external information,the algorithm divides pedestrians' images into hori-zontal and vertical stripes in different local branches respectively,so as to obtain different local feature representations.Plenty of experiments conducted on Market-1501,DukeMTMC-reID,CUHK03 and cross-modal dataset SketchRe-ID show that the proposed method has better overall performance than other comparison algorithms,and is effective and robust.

There is an increasing demand for accurately predicting a person's movement intentions. To be effective, predictions must be performed as early as possible in the preceding step, though precisely how early has been studied relatively little; how and when a persons' movement patterns in a transition step deviate from those in the preceding step must be clearly defined. In this study, we collected motion kinematics, kinetics and electromyography data from 9 able-bodied subjects during 7 locomotion modes, level ground walking, ramp and stair ascent and descent, stepping over an obstacle, and standing still. Twelve types of steps between the 7 locomotion modes were studied, including 5 continuous steps (taking another step in the same locomotion mode) and 7 transitions (taking a step from one locomotion mode into another). For each joint degree of freedom, joint angles, angular velocities, moments, and moment rates were compared between continuous steps and transition steps, and the relative timing during the transition step at which these parameters diverged from those of a continuous step, which we refer to as transition starting times, were identified using multiple analyses of variance. Muscle synergies were also extracted for each step, and we studied in which locomotion modes these synergies were common (task-shared) and in which modes they were specific (task-specific). The transition starting times varied among different transitions and joint degrees of freedom. Most transitions started in the swing phase of the transition step. These findings can be applied to determine the critical timing at which a powered assistive device must adapt its control to enable safe and comfortable support to a user.

Detecting human movement intentions is fundamental to neural control of robotic exoskeletons, as it is essential for achieving seamless transitions between different locomotion modes. In this study, we enhanced a muscle synergy-inspired method of locomotion mode identification by fusing the electromyography data with two types of data from wearable sensors (inertial measurement units), namely linear acceleration and angular velocity. From the finite state machine perspective, the enhanced method was used to systematically identify 2 static modes, 7 dynamic modes, and 27 transitions among them. In addition to the five broadly studied modes (level ground walking, ramps ascent/descent, stairs ascent/descent), we identified the transition between different walking speeds and modes of ramp walking at different inclination angles. Seven combinations of sensor fusion were conducted, on experimental data from 8 able-bodied adult subjects, and their classification accuracy and prediction time were compared. Prediction based on a fusion of electromyography and gyroscope (angular velocity) data predicted transitions earlier and with higher accuracy. All transitions and modes were identified with a total average classification accuracy of 94.5% with fused sensor data. For nearly all transitions, we were able to predict the next locomotion mode 300-500ms prior to the step into that mode.

Background The relationship between psoriasis and hepatitis C was previously controversial, so our purpose is to investigate this connection. Methods We conducted a systematic review of the case–control, cross-sectional and cohort studies examining the association between psoriasis and hepatitis C in PubMed, EMBASE and Cochrane library databases and investigated the overlapping genes between psoriasis targets and hepatitis C targets using bioinformatics analysis. Based on overlapping genes and hub nodes, we also constructed the protein–protein interaction (PPI) network and module respectively, followed by the pathway enrichment analysis. Results We included 11 publications that reported a total of 11 studies (8 cross-sectional and 3 case–control). The case–control and cross-sectional studies included 25,047 psoriasis patients and 4,091,631 controls in total. Psoriasis was associated with a significant increase of prevalent hepatitis C (OR 1.72; 95% confidence interval [CI] (1.17–2.52)). A total of 389 significant genes were common to both hepatitis C and psoriasis, which mainly involved IL6, TNF, IL10, ALB, STAT3 and CXCL8. The module and pathway enrichment analyses showed that the common genes had the potential to influence varieties of biological pathways, including the inflammatory response, cytokine activity, cytokine–cytokine receptor interaction, Toll-like receptor signaling pathway, which play an important role in the pathogenesis of hepatitis C and psoriasis. Conclusion Patients with psoriasis display increased prevalence of hepatitis C and the basic related mechanisms between hepatitis C and psoriasis had been preliminarily clarified.

The quantum confinement effect is important in nanoelectronics and optoelectronics applications; however, there is a discrepancy between the theory of quantum confinement, which indicates that band-gap widening occurs only at small sizes, and experimental observations of band-gap widening in large-diameter nanowires (NWs). This paper reports an obvious blue shift of the absorption edge in the UV-visible absorption spectra of SiC NWs with diameters of 50–300 nm. On the basis of quantum confinement theory and high-resolution transmission electron microscopy images of SiC NWs, band-gap widening in SiC NWs with diameters of up to hundreds of nanometers is fully explained; the results could help to explain similar band-gap widening in other NWs with large diameters.

To obtain nanofibriled cellulose (NFC) with uniform diameter and high aspect ratio, chemical pretreatment was employer to remove the hemicellulose and lignin of cornstalks with further ultrasonic treatment. The prepared samples were characterized by SEM, TEM, FTIR, XRD, and TG. Results showed: The obtained NFC possessed the uniform diameter of about 25 nm and high aspect ratio (>300). The crystalline type of NFC was cellulose I type. The NFC with high crystallinity, high aspect ratio, and nanoscale is a newly great potential nanomaterial in different fields.

nanoTiO2/cellulose composite gels have been uniformly blended during the dissolving process of cellulose in ionic liquids (ILs). After the regeneration process, the obtained hydrogel was finally dried through supercritical CO2 to obtain the TiO2/cellulose composite aerogel. The structure and properties of the composite aerogel were characterized by XRD, SEM, FT-IR, UV-vis, and photocatalytic degradation tests. The porous structure and hydroxyl groups in the regenerated cellulose matrix provided cavities and affinity for the immobilization of TiO2 in the cellulose gels through electrostatic and hydrogen bonding interactions. The TiO2/cellulose composite gels exhibited a good photocatalytic activity for photodegradation of Rhodamine B (RhB) under UV light irradiation. This research highlights another opportunity for the development of the portable and flexible photocatalyst.

According to the requirements of the battery pack on pure electric vehicles, designed a distributed battery management system using the bus communication technology, the system can detect various operating parameters of the battery in real-time, diagnose and alarm according to the battery status. The system can also share information with the other systems of the vehicle through CAN bus. Through testing the system, the result shows that it can accurately measure the current and voltage of the battery, and the measurement accuracy meets the actual requirements.

Many studies have successfully applied near infrared (NIR) spectroscopy to estimate important wood properties. In this paper, the use of NIR (350–2500 nm) spectroscopy to predict the cellulose crystallinity of Poplar (Populus nigra var.) was investigated. The calibration and test models were constructed using partial least squares regression (PLS). The correlations were significant both the calibration and the test samples using six factors, and the correlation coefficients (R2) were 0.9367, 0.9472 respectively. The results suggest that NIR spectroscope may provide a useful tool for rapid and accurate prediction of the cellulose crystallinity of Poplar.

A novel composite, wood-polymer composite, was fabricated by polymerization of functional monomers within wood porous structure. The wood was a fast-growing plant wood, Micheliamacclurel wood, which was rarely reported in previous studies, and two functional monomers, glycidyl methacrylate and ethylene glycol dimethacrylate, were novelly employed. The monomers, added with a few Azo-bis-isobutryonitrile as initiator, and maleic anhydride as catalyst, were first impregnated into wood pores under vacuum/pressure conditions, and then in-situ polymerized into polymers through a catalyst-thermal treatment. After the processes, wood-polymer composite was resulted. SEM and FTIR analysis for the composite indicated that the monomers polymerized into solid polymer, which fully filled up wood pores, and the resulted polymer grafted onto wood matrix, resulting in good interface combination between polymer and wood matrix. Such composite with satisfactory interface can be potentially applied as structural material in construction field.

The fast-growing poplar wood, Populus ussuriensis Kom, was prepared into wood-polymer composite by the in-situ polymerization of methyl methacrylate (MMA) and styrene (St) under vacuum/pressure and subsequent catalyst-thermal conditions. SEM observation, FTIR, XRD and DMA analysis indicated that the resulted polymer well filled up wood cell lumen in an amorphous form and physically reinforce wood matrix, which resulted in the improvement of glass transition temperature and storage modulus of wood. Such method could endow low-quality wood with potential value-added applications.

Decane is one of the volatile organic compounds (VOCs) in human breath. Successful detection of decane in human breath has vast prospects for early lung cancer diagnosis. In this paper, a novel detecting device based on a filter surface acoustic wave (SAW) gas sensor is presented. SAW sensors coated with a thin oxidized graphene film were used to detect decane in parts per million (ppm) concentrations. Control and signal detection circuits were designed using a vector network analyzer with a detection resolution of insertion loss down to 0.0001 dB. The results showed that the SAW sensor could respond quickly with great sensitivity when exposed to 0.2 ppm decane. This device shows tremendous potential in medical diagnosis and environmental assessment.

Michelia macclurei wood with moderate strength is a fast-growing wood in South China. However, it has not been fully utilized. We first prepared it into wood-polymer composite with purpose of good performance by impregnating methyl methacrylate monomer (MMA) into wood pores and following in-situ polymerization. The micro structure of wood-polymer composite, and the morphology and reaction of polymer in wood were characterized by SEM, FTIR and XRD. The SEM observation showed that the MMA monomer polymerized into polymer under the employed conditions and filled up wood cell cavity. FTIR analysis indicated that the monomer rarely reacted with wood cell wall during its polymerization. XRD characterized that the polymer from MMA monomer mainly physically existed in wood pores and remained as an amorphous form.

Cellulose micro/nano fibrils generated from biomass are relative new reinforcing materials for polymer composites, which have potential lightweight and high strength and are renewable. In the present study, the preparation method of extracting cellulose micro/nano fibrils from wood was introduced. After successful disintegration, the morphological characteristics of the wood fibers, purified cellulose fibers, cellulose fibers activated by ultrasonic-wave and cellulose micro/nano fibrils after homogenization treatment, were compared by visual examination and scanning electron microscopy. The results showed that cellulose micro/nano fibrils have been efficiently extracted from wood, which have great potential in the application areas of papermaking, bio-nanocomposites, food, cosmetics/skin cream, medical/pharmaceutical, and so on.

Bio-based materials such as wood, bamboo, bio-straw material are vulnerable to degradation by microorganisms and susceptible to change in dimension under humidity, which greatly reduced their service life. In this study, a novel thought was inspired from the unique porous structure of bio-based material that durability of wood may be capable of being improved by generating polymer in situ the special structure. Maleic anhydride (Man) and Styrene (St) were used to penetrate into wood for further copolymerization. SEM observation shows that polymer filled in wood porous structure and tightly contacted wood matrix (i.e. biopolymers), indicating strong interaction between them. FTIR analysis indicates that polymer chemically grafted onto wood matrix by reaction of anhydride group and hydroxyl group. As the amount of hydroxyl groups greatly reduced for their reacting with polymer, the dimensional stability of wood immersing in water was improved; and as the reaction of wood with polymer, the biopolymers were wrapped by resultant polymer, preventing the sample from attack of microorganisms, thus decay resistance of treated wood against microorganisms was greatly improved. Both of them contributed to the improvement of wood durability.

A novel biomass composite, wood-polymer composite with potential good mechanical properties, durability and environmental characteristic capable of applying in fields of construction and traffic as structural material, was prepared by generating high-performance polymer from in situ polymerization of styrene in wood porous structure. The vinyl monomer, styrene, combing with 1wt% AIBN as an initiation, was first impregnated into wood porous structure under a vacuum/pressure condition, and then in situ polymerized through a thermal treatment. The structure of the resultant composite was characterized by SEM, FTIR and XRD. Results show that styrene polymerized into polystyrene through free radical polymerization, and the resultant polymer fully filled in wood porous structure in a column form, partly contacting wood matrix. FTIR analysis indicates that polystyrene generated into wood pores, indicating weak interaction between them. XRD analysis suggests that the polystyrene generated into wood pores mainly existed in an amorphous form.

Wood-polymer composite was prepared by a novel combined two-step method with maleic anhydride (MAN) for the first treatment, and mixed monomers of glycidyl methacrylate (GMA)/ methyl methacrylate (MMA) (1:5 of molar ratio) for the second treatment. SEM and FTIR technologies were employed to characterize the interfacial compatibility between resultant polymer and wood matrix, and the dimensional stability of the resultant wood-polymer composite was also tested. The results indicated that polymers fully filled up wood cell lumina and chemically bonded to wood cell wall, resulting in the improvement of interfacial compatibility between polymer and wood matrix without obvious lacunae. The dimensional stability of poplar wood was significantly improved after the combined two-step treatment, and became more stable than that of PEG-1000 treated Poplar Wood.

This paper aimed to investigate the influence of NaCl to water molecular movement. The interpretation is that NaCl could change structure of microscopic capillary in wood and increase energy consumption for water movement in capillary. Crystallized of NaCl in capillary made the pipe diameter diminished, resulted in the reduce of movement velocity for water, at the same time the adsorbed water increased, which leaded to consume more energy to destroy this bond force between adsorbed water and wood or NaCl.

This Study Investigated the Conventional Drying Characteristics of Birch (Betula Costata) Tree Disk Impregnated with NaCl Solution. the Results Showed that NaCI Content in Wood Was Depending on Impregnated Times, and the Relationship between them Was Linear Dependence. the Drying Duration of Treated Disk Was Longer by 25% than that of Untreated Disk. Na+ and Cl-, which Were Easy to Enter the Cell Wall and Combined with Microfibril, which Was the Major Reason for Enhancing Tensile Strength Perpendicular to the Grain and Restrain Cracks.

In this paper, we focused on a new decorative light density board with a new fiber unit-- micron wood flake, which were large size in length and a very small size in thickness. With these flakes, we processed the light density board in the laboratory, Cunninghamia lanceolata abounded in Fujian Province, Paulownia tomentosa from Anhui Province, L.gemelini Rupr., and Betulaceae abounded in Northeast of China were selected as raw materials, and modified UF as resin. Then several single factor experiments were conducted to discuss the effects of the factors on the physical and mechanical properties of the board, such as board density, resin content, and species of trees as well. The results showed that the density and resin content had significant effects on the mechanical properties of the board. The physical and mechanical properties of the samples, density ranged from 0.3 to 0.5g/cm3, reached Japanese Light Particleboard Standard JISA5908, and the thermal conduction of the board processed with the four species tree were just like solid wood.

Controlled anatase TiO2 was grown on cellulose surface using a fragile hydrothermal method in different conditions. With the analysis of FTIR spectra, the grown TiO2 was chemically attached to the cellulose surface. The morphologies and amount of grown TiO2 on cellulose surface could be controlled through the adjustment of reacting factors. From the observation of SEM images, the morphology and content of TiO2 grown on cellulose surface could be controlled under appropriate reaction conditions. Under the regulation of reactant conditions, the content ranging from 8.7%-34.2% of TiO2 could be grown on cellulose surface.

Regenerated cellulose/polyvinyl alcohol (PVA) blend membranes were prepared from a solution of cellulose and PVA in an ionic liquid of 1-allyl-3-methyimidazolium chloride (AMImCl). SEM images showed that the phase separation on the mixture was severely formed when the content of PVA was higher than 10% by volume. However, when the content of PVA in the mixture was lower than 6%, the cellulose and PVA were well-distributed. The regenerated blend membranes using the AMImCl presenting reasonable crystallinity were superior to those of regenerated pure cellulose membrane. In conclusion, the compatible properties of blend membranes from regenerated cellulose/PVA (6%) were improved and the blend membranes kept original biodegradability.

A novel wood-based composite, Wood-PSt Composite, combining both advantages of wood and polymer was fabricated by impregnating styrene monomer into wood pores, followed by in-situ polymerization through a catalyst-thermal treatment inspired from the special porous structure. The manufacturing craft involving the impregnating craft and the polymerizing craft was studied and its structure was also observed by SEM. The analysis results indicated that the optimum impregnating condition was pressure: 0.5MPa, and time: 20min; and the monomer loading linearly correlated with pressure described as Y=201X+8.9, and linearly correlated with time described as Y=3.4X+31.4, respectively. The optimum polymerization craft was temperature: 80°C, time: 8h and AIBN: 3%. SEM observation showed that polystyrene generated in situ wood cellular structure and filled up wood pores under the optimum impregnating and polymerizing crafts, which was in accordance with the optimum manufacturing craft.

A new composite, wood-polymer composite, was fabricated by formation of poly (methyl methacrylate) in wood cellular structure. Methyl methacrylate (MMA) monomer and a few of 2,2'- azobisisobutyronitrile (AIBN) as an initiator, as well as several drops of pyrimidine as catalyst were first impregnated into wood porous structure under a pressure condition, and then initiated for thermal polymerization through a catalyst-thermal treatment. The mechanical properties of the composite were tested, and the composite was also analyzed by SEM and DSC to further correlate its performance. The results indicated that the modulus of rupture, modulus of elasticity, compression strength and hardness of Wood-PMMA Composite were improved by 68.28%, 110.27%, 62.43%, 357% over those of Untreated Wood, respectively. The SEM observations showed that PMMA generated and filled up wood pores under the employed conditions, and thus reinforced the mechanical properties of wood. DSC analysis suggested that Wood-PMMA Composite was more thermal stability than Untreated Wood as the formation of PMMA within wood pores.

Inspired from the natural porous structure of wood, a novel wood-polymer composite combining both advantages of wood with high strength-to-weight ratio as a natural renewable resource and polymer as a reinforcer was manufactured by synthesis of terpolymer of methyl methacrylate (MMA), Styrene (St) and Vinyl Acetate (VAc) inside wood. The three kinds of monomers with a few of 2,2'- azobisisobutyronitrile (AIBN) as an initiator, as well as some additives were first impregnated into wood porous structure under a pressure condition, and then initiated for terpolymerization through a catalyst-thermal treatment. The impregnating conditions containing pressure value and pressure time, and polymerizing crafts including heating temperature and heating time, as well as additive content were confirmed according to rate of monomer loading and rate of polymer loading inside wood. Results indicate that among these influencing factors, pressure and temperature were the significant influencing factors; and the rate of monomer loading and rate of polymer loading linearly positive correlated to them, respectively. SEM observation shows that the terpolymer fully filled in wood porous structure under the optimum manufacturing craft.

A novel Wood-Polymer Composite, Wood-PSt composite combining both advantages of wood and polystyrene was fabricated by determining the polymerization craft of monomer in wood porous structure through impregnating monomer into wood pores and followed by in-situ polymerization through a thermal-catalyst treatment. The performance was examined, and its structure was also characterized by SEM and FTIR. The results indicate that the optimum polymerizing craft is: 80oC, 8h and 3% AIBN. Under the optimum craft, the mechanical properties involving modulus of elasticity and compression strength were linearly increased with content of polystyrene. SEM and FTIR show that styrene polymerized under the employed polymerization craft, and the resultant polystyrene relatively full generated in wood cellular structure, in accordance with the results of the optimum polymerizing craft. Such composite having good mechanical properties and biomass features can be widely used in fields of construction, traffic and furniture.

In order to improve the value-added applications of low-quality wood, a novel Wood-Polymer Composite was fabricated by in-situ synthesis of copolymer from monomers within wood porous structure. The structure was characterized with SEM and FTIR, and its dimensional stability was also tested. The SEM observations showed that copolymer filled up wood pores and contact tightly with wood matrix, indicating strong interactions between them. FTIR analysis indicated that when the monomers copolymerized in situ wood porous structure, they also reacted with wood matrix by reaction of hydroxyl groups and ester groups, indicating chemical bond between the two phases, which is agreement with SEM observations. The volume swelling efficiency and contact angle of such composite were higher than those of wood, respectively, indicating good dimensional stability involving volume swelling efficiency and contact angle. Such composite could be potentially applied in fields of construction, traffic and indoor decoration.

In order to improve the value-added applications of low-quality wood, a novel composite, wood-polymer composite, was fabricated by in-situ terpolymerization of MMA, VAc and St within wood porous structure. The structure of the composite and the reaction of monomers within wood were both analyzed by SEM and FTIR, and the mechanical properties were also evaluated. The SEM observation showed that the polymer mainly filled up wood pores, suggesting good polymerizating crafts. The FTIR results indicated that under the employed crafts, three monomers terpolymerized in wood porous structure, and grafted onto wood matrix through reaction of ester group from monomers and hydroxyl group from wood components, suggesting chemical combination between the two phases. The mechanical properties of the wood-polymer composite involving modulus of rupture, compressive strength, wearability and hardness were improved 69%, 68%, 36% and 210% over those of untreated wood, respectively. Such method seems to be an effective way to converting low-quality wood to high-quality wood.

Waterborne preservative of DDAC and boride are used to impregnate P. ussuriensis Kom lumbers by roller compression under compression rates ranging from 10 percent to 50 percent. Results showed that the cranny in intervascular pit membranes appeared, and the cell wall of vessel element and fiber segment displayed drape and cranny due to roller compression. With the rise of compression rate, both the penetration depth of preservative and the retention quantity of preservative in the experimental lumber increased, while the mass loss rate decreased.The penetration depth perpendicular to the grain was more than 3.9 mm, while that parallel to the grain of wood was more than 20 mm when the compression rate was greater than or equal to 30 percent. Under the compression rate of 30 percent, the retention quantity of preservative in the experimental lumber impregnated with DDAC (thickness of 1 percent) was 8.743 kg/m3 and the mass loss rate was 14.36 percent, while those with boride (thickness of 2 percent) are 3.322kg/m3 and 9.92 percent.

The mechanics properties of P. ussuriensis Kom lumber compressed by rollers decreases a little, the loss of which in tangential compression is more than that in radial one. The loss of mechanics strength increases with the rise of the compression rate. The Compressive strength parallel to the grain of wood is from 2.391% to－4.589%, the Shearing strength parallel to the grain is from－2.071% to－14.213%, the Tensile strength parallel to the grain is from 2.246% to－11.535%, the Tensile strength perpendicular to the grain is from－0.217% to－16.877%, the Cleavage strength of wood is from 1.785% to－16.235%, the Bending strength of wood is from 4.417% to－27.793%, the Modulus of elasticity in static bending is from 1.045% to－19.455%, and the Toughness of wood is from 3.413% to－28.929%.

The objective of this paper is to use the modified nano-calcium carbonate compositing directly or sol-gel compositing with poplar wood by the vacuum infusion methods to prepare new environmental materials. This paper introduces promotion effects of nano-technology on the development of fast-growing poplar wood, the problems and research of fast-growing poplar wood compositing with nano-materials. By preparing the new environmental materials, we implement the use of plantation timber to produce high value-added products, and the use of a variety of nano-technology to improve the performances of wood, and improve timber utilization.

According to the three-factor theory, the surface roughness of different wood-based environmental materials was evaluated using the surface roughness profiling instrument, and the underlying effective factors of the differences were analyzed. The psycho-physiological examination of the materials’ roughness on human psychology and physiology was also carried out. During the examination, physical roughness factors of the materials were treated as the independent variable, and the heart rate variability (HRV) and dynamic blood pressure (DBP) were chosen as the dependent variables. The sympathetic and parasympathetic activities of human autonomic nervous system as toughing material surface were investigated depending on the time domain analysis of HRV. The results showed that there exists a negative linear correlation between the physical roughness of materials and the human psycho-physiologic indexes. Overall, wood materials were proper to physiological stimulate of the body, they can’t cause the risk of physiological imbalance and would soon return to normal mentation after touching. Mental capacity with HRV of the body could illustrate the suitable tactile sense characteristics with the performance of the basic physical quantities of wood materials.

In this paper, we focus on a new wood-based panel unit, which was named Micron Wood Flake for its large size in length, a very small size in thickness, and especially its wooden color in appearance. The flakes were obtained by mechanical processing on waste wood based on the micro-processing theory and technique. In order to design the device and determine the key processing parameters, a simulation of micron wood flake was proceeded based on a mathematical model of single wood cell proposed here. Comparing with the experiments results, it showed that the model is feasibility to some extent. In contrast to the other methods of disposing waste woods, the method proposed here is no environment pollution absolutely, consequently, as an application of this kind flakes, a new environment-friendly decorative board was developed, and the physical and mechanical properties of the samples reaches Japanese light particleboard standard JISA5908.

A new material was prepared by formation of polystyrene in situ wood porous structure from styrene monomer through thermal-catalyst treatment. And the performance of such wood-polymer composite, containing mechanical properties and durability, was also tested. The SEM results showed that polymer was generated inside wood, and filled in wood cellular structure. The mechanical properties of such wood-polystyrene composite including modulus of rupture (MOR), modulus of elasticity (MOE), compression strength and hardness, were respectively improved 38%, 77%, 21% and 97% over untreated wood. And the durability of the novel composite involving dimensional stability, decay resistance and stability against weather erosion were remarkably improved than those of untreated wood. Such composite can be widely used in fields of construction, traffic and interior decoration, which greatly enhanced the utilization of low-valued wood material instead of high-quality wood.

A new composite, wood-polymer composite, was fabricated by formation of poly (methyl methacrylate) in wood cellular structure. Methyl methacrylate (MMA) monomer and a few of 2,2'- azobisisobutyronitrile (AIBN) as an initiator, as well as several drops of pyrimidine as catalyst were first impregnated into wood porous structure under a pressure condition, and then initiated for thermal polymerization through a catalyst-thermal treatment. The structure of Wood-PMMA Composite was characterized by SEM, FTIR, XRD, and its thermal stability was also examined. The results indicate that PMMA polymer generated in wood cellular structure as an amorphous form, and interacted with wood cell walls, resulting in chemical combination between them. The thermal stability of Wood-PMMA composite was higher than untreated wood under 450°C.