With the help of the testing apparatus made by ourselves for shielding electromagnetic radiation, the electric conductivity and shielding effectiveness of electromagnetic radiation of polyethylene film contained diffe...With the help of the testing apparatus made by ourselves for shielding electromagnetic radiation, the electric conductivity and shielding effectiveness of electromagnetic radiation of polyethylene film contained different content of carbon particles was systematically studied in this paper. The results indicate that the electric conductivity and shielding effectiveness of electromagnetic radiation of polyethylene /carbon film have closely relations with content of carbon black particles, which exists a critical content value as 14%~30% and its properties will have a tremendous change.展开更多
The paper compares clothing thermal resistance of the same ensemble tested by different thermal manikins in different laboratories. It also examines the consistence of the two groups of total thermal resistance by Pai...The paper compares clothing thermal resistance of the same ensemble tested by different thermal manikins in different laboratories. It also examines the consistence of the two groups of total thermal resistance by Paired-Sample T Test method, which proves that there is no remarkable difference in testing results under the same experiment method and requirement. It is of great significance in promoting the application of thermal manikin testing technology and academic exchange among different institutes.展开更多
A new process for the rubber hose reinforced with warp knitted fabric was introduced, and the relation between the inside pressure and the radial expansion ratio of four kinds of rubber radiator hose reinforced with w...A new process for the rubber hose reinforced with warp knitted fabric was introduced, and the relation between the inside pressure and the radial expansion ratio of four kinds of rubber radiator hose reinforced with warp knitted fabric was investigated. The result showed that the bursting pressure and the radial direction expansion ratio of the hose could meet the requirement of ISO4081 for auto radiator hose. A new model was built up to analyse the relation between the inside pressure and the radial expansion ratio of the hose based on the reinforced fabric structure parameters and yarn properties.展开更多
By means of texturing with organic conductive fiber, and then being treated with JAM-Y1 anti-bacteria agent, in the end, treated with the XL-550 waterproof agent, the PET fabric has permanent antistatic, anti-bacteria...By means of texturing with organic conductive fiber, and then being treated with JAM-Y1 anti-bacteria agent, in the end, treated with the XL-550 waterproof agent, the PET fabric has permanent antistatic, anti-bacteria and waterproof and anti-oil properties. The PET fabric was laminated with PTFE membrane by paste dot coating, and then coated by Poly(ether-ester) solution in a direct process. The filter efficiency of NaCl aerosol, penetration property of poliomyelitis virus in liquid and animalcule in air of PET fabric laminated with PTFE membrane are measured. The properties show that the PET fabric laminated with PTFE membrane can separate SARS virus in air and liquid. The protective mechanism is also discussed in the article.展开更多
This paper presents a new idea for intensifying protective and stretch recovery properties of micro porous polytetrafluorethylene and hydrophilic polyurethane (PTFE/PU) layered membrane through a co-stretching process...This paper presents a new idea for intensifying protective and stretch recovery properties of micro porous polytetrafluorethylene and hydrophilic polyurethane (PTFE/PU) layered membrane through a co-stretching process. The structure and properties of co-stretching PTFE/PU layered membrane and coated PTFE/PU layered membrane by means of directly coating the PU on the PTFE membrane were investigated using Electron Microscope, Universal Materials Testing Machine, and the water vapor permeability (WVP) was measured according to absorption method of water vapor of GB/T 12704-91. Contrasted to PU coating process, the PU membrane on the co-stretching PTFE/PU membrane is nonporous because of heat treatment process, which can prevent the SARS virus from permeating the Co-stretching PTFE/PU membrane. The stretch and recovery properties of the Co-stretching PTFE/PU membrane is at least 66% after being stretched to 50% of its original length in transverse directions and that of the coated PTFE/PU membrane is 52%. The WVP of the Co-stretching PTFE/PU membrane is 13 523 g/24 h·m^2. The results suggest that when Co-stretching PTFE/PU membrane is laminated to a stretchable fabric, the fabric would have excellent stretch and recovery properties while waterproof and being permeable to water vapor. So, the Co-stretching PTFE/PU membrane laminated fabric will be a comfortable protective clothing material.展开更多
The mechanical properties of laser welded joints under impact loadings such as explosion and car crash etc. are critical for the engineering designs. The hardness, static and dynamic mechanical properties of AISI304 a...The mechanical properties of laser welded joints under impact loadings such as explosion and car crash etc. are critical for the engineering designs. The hardness, static and dynamic mechanical properties of AISI304 and AISI316L dissimilar stainless steel welded joints by CO2 laser were experimentally studied. The dynamic strainstress curves at the strain rate around 103 s-1 were obtained by the split Hopkinson tensile bar (SHTB). The static mechanical properties of the welded joints have little changes with the laser power density and all fracture occurs at 316 L side. However, the strain rate sensitivity has a strong depen- dence on laser power density. The value of strain rate factor decreases with the increase of laser power density. The welded joint which may be applied for the impact loading can be obtained by reducing the laser power density in the case of welding quality assurance.展开更多
Cultivable bacteria were isolated from seawater-based retting treatment of hemp, in which three of purified strains (SW- 1, SW- 2, and S-SW1) produced relatively high levels of pectinase activities, and also produced ...Cultivable bacteria were isolated from seawater-based retting treatment of hemp, in which three of purified strains (SW- 1, SW- 2, and S-SW1) produced relatively high levels of pectinase activities, and also produced mannanases and xylanases. PCR-based entebacterial repetitive intergenic consensus primers (ERIC-PCR) were employed for fingerprinting DNA of the bacterial strains. The ERIC-PCR fingerprints of stains SW- 1, SW- 2, and S-SW1 were found to be different, and should be further identified for each isolate. Strains SW- 1 and SW- 2 were identified as Stenotrophomnas maltophilia, while strain S-SW1 was assigned to Ochrobactrum anthropi by BIOLOG system. These two species represented rhizosphere bacterial genera, and possibly were introduced by the hemp plants. These organisms seemed potentially capable of producing pectinase and hemicellulase, and thus effectively degrading the gum substances in the seawater retting. This research could be helpful for improving a novel seawater-based retting treatment of hemp.展开更多
The Lower Limbs Exoskeleton jumping assisting Intelligence System (LLEIS) can be used to improve ma- neuverability of soldiers with key technologies of human motion characteristics recognition and design of an intel...The Lower Limbs Exoskeleton jumping assisting Intelligence System (LLEIS) can be used to improve ma- neuverability of soldiers with key technologies of human motion characteristics recognition and design of an intelli- gence power assisting device. Data on the movement of human lower limbs has been collected by using three kinds of instruments to research the parameters of characteristics recognition. The results indicated that the optimal angle be- tween knee and ankle is 157° for jumping assistance, and the peak force on the arch is 80 N in upward jumping and much lower in forward jumping. The LLEIS simplified model is accomplished under UG and exported into AD- AMS for the kinematics and dynamics simulation. The research findings indicate that the LLEIS can be used to enhance carrying and hopping ability of lower limbs effectively and as a reference for the design of a real system.展开更多
文摘With the help of the testing apparatus made by ourselves for shielding electromagnetic radiation, the electric conductivity and shielding effectiveness of electromagnetic radiation of polyethylene film contained different content of carbon particles was systematically studied in this paper. The results indicate that the electric conductivity and shielding effectiveness of electromagnetic radiation of polyethylene /carbon film have closely relations with content of carbon black particles, which exists a critical content value as 14%~30% and its properties will have a tremendous change.
文摘The paper compares clothing thermal resistance of the same ensemble tested by different thermal manikins in different laboratories. It also examines the consistence of the two groups of total thermal resistance by Paired-Sample T Test method, which proves that there is no remarkable difference in testing results under the same experiment method and requirement. It is of great significance in promoting the application of thermal manikin testing technology and academic exchange among different institutes.
文摘A new process for the rubber hose reinforced with warp knitted fabric was introduced, and the relation between the inside pressure and the radial expansion ratio of four kinds of rubber radiator hose reinforced with warp knitted fabric was investigated. The result showed that the bursting pressure and the radial direction expansion ratio of the hose could meet the requirement of ISO4081 for auto radiator hose. A new model was built up to analyse the relation between the inside pressure and the radial expansion ratio of the hose based on the reinforced fabric structure parameters and yarn properties.
文摘By means of texturing with organic conductive fiber, and then being treated with JAM-Y1 anti-bacteria agent, in the end, treated with the XL-550 waterproof agent, the PET fabric has permanent antistatic, anti-bacteria and waterproof and anti-oil properties. The PET fabric was laminated with PTFE membrane by paste dot coating, and then coated by Poly(ether-ester) solution in a direct process. The filter efficiency of NaCl aerosol, penetration property of poliomyelitis virus in liquid and animalcule in air of PET fabric laminated with PTFE membrane are measured. The properties show that the PET fabric laminated with PTFE membrane can separate SARS virus in air and liquid. The protective mechanism is also discussed in the article.
基金Supported by the Ph. D.Innovation Foundation of Donghua University (101 06 0019064)
文摘This paper presents a new idea for intensifying protective and stretch recovery properties of micro porous polytetrafluorethylene and hydrophilic polyurethane (PTFE/PU) layered membrane through a co-stretching process. The structure and properties of co-stretching PTFE/PU layered membrane and coated PTFE/PU layered membrane by means of directly coating the PU on the PTFE membrane were investigated using Electron Microscope, Universal Materials Testing Machine, and the water vapor permeability (WVP) was measured according to absorption method of water vapor of GB/T 12704-91. Contrasted to PU coating process, the PU membrane on the co-stretching PTFE/PU membrane is nonporous because of heat treatment process, which can prevent the SARS virus from permeating the Co-stretching PTFE/PU membrane. The stretch and recovery properties of the Co-stretching PTFE/PU membrane is at least 66% after being stretched to 50% of its original length in transverse directions and that of the coated PTFE/PU membrane is 52%. The WVP of the Co-stretching PTFE/PU membrane is 13 523 g/24 h·m^2. The results suggest that when Co-stretching PTFE/PU membrane is laminated to a stretchable fabric, the fabric would have excellent stretch and recovery properties while waterproof and being permeable to water vapor. So, the Co-stretching PTFE/PU membrane laminated fabric will be a comfortable protective clothing material.
基金supported by the National Natural Science Foundation of China (10832011)
文摘The mechanical properties of laser welded joints under impact loadings such as explosion and car crash etc. are critical for the engineering designs. The hardness, static and dynamic mechanical properties of AISI304 and AISI316L dissimilar stainless steel welded joints by CO2 laser were experimentally studied. The dynamic strainstress curves at the strain rate around 103 s-1 were obtained by the split Hopkinson tensile bar (SHTB). The static mechanical properties of the welded joints have little changes with the laser power density and all fracture occurs at 316 L side. However, the strain rate sensitivity has a strong depen- dence on laser power density. The value of strain rate factor decreases with the increase of laser power density. The welded joint which may be applied for the impact loading can be obtained by reducing the laser power density in the case of welding quality assurance.
基金Programfor Changjiang Scholars and Innovative Research Teamin University,China( No .IRT0654)Major State Basic Research Development Program,China ( No .2008CB617506)Analysis and Test Foundation of Zhejiang Province,China ( No .2007F70040)
文摘Cultivable bacteria were isolated from seawater-based retting treatment of hemp, in which three of purified strains (SW- 1, SW- 2, and S-SW1) produced relatively high levels of pectinase activities, and also produced mannanases and xylanases. PCR-based entebacterial repetitive intergenic consensus primers (ERIC-PCR) were employed for fingerprinting DNA of the bacterial strains. The ERIC-PCR fingerprints of stains SW- 1, SW- 2, and S-SW1 were found to be different, and should be further identified for each isolate. Strains SW- 1 and SW- 2 were identified as Stenotrophomnas maltophilia, while strain S-SW1 was assigned to Ochrobactrum anthropi by BIOLOG system. These two species represented rhizosphere bacterial genera, and possibly were introduced by the hemp plants. These organisms seemed potentially capable of producing pectinase and hemicellulase, and thus effectively degrading the gum substances in the seawater retting. This research could be helpful for improving a novel seawater-based retting treatment of hemp.
文摘The Lower Limbs Exoskeleton jumping assisting Intelligence System (LLEIS) can be used to improve ma- neuverability of soldiers with key technologies of human motion characteristics recognition and design of an intelli- gence power assisting device. Data on the movement of human lower limbs has been collected by using three kinds of instruments to research the parameters of characteristics recognition. The results indicated that the optimal angle be- tween knee and ankle is 157° for jumping assistance, and the peak force on the arch is 80 N in upward jumping and much lower in forward jumping. The LLEIS simplified model is accomplished under UG and exported into AD- AMS for the kinematics and dynamics simulation. The research findings indicate that the LLEIS can be used to enhance carrying and hopping ability of lower limbs effectively and as a reference for the design of a real system.