Search results

This forced citizens to start making protective masks from various improvised materials.
However, again the properties of the materials are not disclosed, which does not guarantee a similar result when using similar fabrics.
Peltier, Evaluating the efficacy of cloth facemasks in reducing particulate matter exposure, Journal of Exposure Science and Environmental Epidemiology. 27 (2017) 352-357
Robertson, What Are the Best Materials for Making DIY Masks?
Borrmann, Aerosol filtration efficiency of household materials for homemade face masks: Influence of material properties, particle size, particle electrical charge, face velocity, and leaks, Aerosol Science and Technology. 55 (1) (2021) 63-79

An effective product manufacturability evaluation procedure necessitates the consideration of qualitative criteria, e.g., product quality, as well as quantitative criteria such as material cost in the decision process.
So an effective product manufacturability evaluation procedure necessitates the consideration of qualitative criteria, e.g., product quality, as well as quantitative criteria such as material cost in the decision process.
The research mainly considers four aspects of product cost, namely, device units cost, labor units cost, auxiliary units cost and materials units cost.
Materials Processing Technology, Vol.138,2003,pp.223-230
Sueyoshi, “A unified framework for the selection of a Flexible Manufacturing System,” European Journal of Operational Research, vol.85, 1995, pp.297-315.

NURBS Curve Fitting Based on Arc Centripetal Parameterization for Tool Path Generation Cun Guang Yu College of Science, Heilongjiang Institute of Science and Technology, Harbin, 150027, China Email:yucunguang-3180@163.com Key Words: NURBS Curves; Centripetal Parameterization; Tool Path; NC Machining; Abstract: NURBS curve fitting is used for tool path planning for sculptured surface NC machining.
Foundation item: Projects are supported by the National Natural Science Foundation (51105135) Reference: [1] Piegl L,Tiller W.
NURBS interpolator for constant material removal rate in open NC machine tools.
International Journal of Machine Tools and Manufacture, 2004, 44:237~245 [5] Ron Goldman, A Dynamic Programming Approach to Curves and Surface for Geometric Modeling.

A Study on Mathematical Model of Servo Valve Torque Motor Changhai Liu1, a, Hongzhou Jiang2, b 1,2 Department of Fluid Control and Automation, Harbin Institute of Technology, Box 3040, Science Park, No.2, Yikuang Street Nangang District, Harbin, P.R China 150001 alchhit@yahoo.cn, bjianghz@hit.edu.cn Keywords: servo valve torque motor, magnetic reluctance, electromagnetic torque constant, magnetic spring stiffness.
The characteristic for the yokes and the armature are made of soft magnetic material.The purpose of this section is to get the flux passing through the armature and get the synthetic fluxes passing through these four air-gaps.
Acknowledgements This work is financially supported by the National Natural Science Foundation of China (Grant No. 50975055).
Urata: submitted to Journal of Mechanical Engineering Science(2007)

Gasoline has a wide range of physical and chemical properties, and therefore there is no single, common sample preparation method for their recovery from fire debris.Gas flaw detector and fire dogs are also used to identify the place of material evidence; however, the other methods analysis gasoline can not and should not be replaced by these ways mentioned above.
G, The recovery of accelerants in aqueous samples from fire debris using solid-phase microextraction (SPME), Forensic Science Society, 1996,36(4), 283-287
Ghosal, Detection and Characterization of Petroleum Based Accelerants in Fire Debris by HPLC, Journal of Liquid Chromatography & Related Technologies, 1995 18,(9) ,1767 - 1786
  [4]McCurdy R J; Atwell T;Cole M D, The use of vapour phase ultra-violet spectroscopy for the analysis of arson accelerants in fire scene debris, 40 South Alabama Street, Indianapolis, IN 46204, USA Forensic science international 2001, 123(2-3), 191-201
[5] Ikuo UETA, Yoshihiro SAITO, Kenta TERAOKA, Hisashi MATSUURA, analytical sciences, 2010, 26,1127-1132.

The Research and Application on Computational Methods in Fluid Dynamics Su Keqin1, a, Wang Yawei1,b and Wang Jianping1,c 1 College of Information and Management Science, Henan Agricultural University, Zhengzhou, 450002, China akqsu@ss.buaa.edu.cn, b321wangyawei@163.com, cxwjpw007@126.com Keywords: Flux Vector Splitting; NND Scheme; Shock Capturing; Fluid Dynamics Abstract.
Van Leer FVS for Euler Equations The time-dependent and one-dimensional Euler equations are a system of non-linear hyperbolic laws that govern the dynamics of a compressible material, and the conservative form is given by （1） where , , , , According to the Van Leer FVS method [5,6,7], the flux vector can be split as and (2) The Van Leer splitting method does not involve matrix operations, positive and negative fluxes have the fixed expressions, it is easy to program and has fine maneuverability.
Acknowledgements This work was financially supported by Natural Science Foundation of Henan Education Committee(2011A110007), and the college of information and management science in Henan Agricultural University has provided tremendous support to this work.
[5] Van Leer B: Lecture Notes in Physics Vol. 1970 (1982), p. 507 [6] Van Leer B: Journal of Computational Physics Vol. 32 (1979), p. 101 [7] Toro E F, in: Riemann Solvers and Numerical Methods for Fluid Dynamics(Springer, 1999)

Carboxymethylation Fiber of Dissolved Air Flotation Rejects and its Influences on Paper Properties Yanghong Wang,a, Xianliang Song *,b , Hua Qian c, (College of Material Science and Technology, Beijing Forestry University, Beijing 100083, China) No.35 Tsinghua East Road Haidian District,Beijing,P.R.China abjfuwyh@163.com, b sxlswd@163.com, cQianhua@bjfu.edu.cn Keywords: fiber, dissolved air flotation rejects, carboxymethylation, paper properities Abstract.
Experiment Materials Dissolved air flotation rejects were obtained from product line of waste paper deinking of No. 7 paper factory of Beijing.
[6] Zhu Jingchao, Tang Sundongri, Song Xianliang, Influences of Adding Nano-Materials on Paper Properties, Paper and Paper Making, 5（2011）33-36
[12] Bangi CAO, Ulrike TSCHIRNER, Shri RAMASWAMY,Impact of pulp chemical composition on recycling, Tappi Journal, 81(1998) 119-127
[13]Chen Jiaxiang, Studies on Recycling Fiber Surface Properties with AFM, Paper Science & Technology,  27(2008)1-4.

The low pressure plasma treatment represents a universal, efficient and eco-friendly alternative for surface modifications of any synthetics materials [4].
Basic material properties of fibers are summarized in table below (Table 1).
Basic material properties of fibers are summarized in table below (Table 1).
Table 1: Basic material parameters of used fibers [3, 9].
Owen, Hydrophobic recovery of plasma-treated polydimethylsiloxane, The Journal of adhesion 54 (1995) 33–45

Fractal Characteristics of Primary Phase Morphology in Semisolid A356 Alloy Zheng Liua, Xiaomei Liub Faculty of Mechanical and Electronic Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China a liukk66@163.com, b liuxm66@163.com Keywords：semisolid, primary phase morphology, fractal, A356 alloy Abstract: Semisolid A356 alloy was prepared by low superheat pouring and slightly electro- magnetic stirring(LSPSES).
Acknowledgements-The authors would like to thank the National Natural Science Foundation of China (No. 51144009).
Tanaka: Journal of Materials Science Vol. 33 (1998), p. 4783 [3] Q.
Sekhar: Materials Letters Vol. 60 (2006), p. 1089 [10] P.
Kitahara: Materials and Design Vol. 30 (2009), p. 1169 [12] B.

Ni-Resist is one of the most widely utilized materials in corrosive environments, due to its excellent resistance to corrosion by alkaline fluids and dilutes acid, especially for chloride containing media.
Despite its successful application in different corrosive environment, this material still being investigated and tested to obtain a better performance in corrosive environments [2].
Austempered ductile iron (ADI) is new, perspective construction material with excellent combination of strength, plasticity and toughness.
Ibegbulam, International Journal of science and technology, vol. 2, pp. 618-621 (2012)
Ming-Li, Corrosion science, vol. 52, pp. 2945-2949 (2010)