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101.
This paper presents an overview of our recent work on continuous collision detection methods and constraints handling for rigid polyhedral objects. We demonstrate that continuous collision detection algorithms are practical in interactive dynamics simulation of complex polyhedral rigid bodies and show how continuous collision detection and efficient constraint-based dynamics algorithms allow us to perform various virtual prototyping tasks intuitively, precisely and robustly on commodity desktop computers. Especially, we present two applications of our system to actual industrial cases. We note that both tasks are performed with a simple 2D mouse on a high-end computer. 相似文献
102.
Yosra Ben-Fadhel Nassima Ziane Stephane Salmieri Monique Lacroix 《Food and Bioprocess Technology》2018,11(1):84-95
Broccoli is an important source of many nutritional and bioactive compounds. However, its shelf-life is very short due to physicochemical losses and microbiological degradation. This study was undertaken to implement treatments that could improve the quality of ready-to-eat (RTE) broccoli during storage by evaluating the effect of pre-treatment with calcium chloride (CaCl2) and alginate coating on the physicochemical and microbial properties of RTE broccoli. Broccoli florets were pre-treated with three different concentrations of CaCl2 (1, 2.5, and 4 g L?1), then coated with an alginate formulation (13 g L?1) and stored at 4 °C for 24 days. Texture, color, weight loss, respiration rate, and total mesophilic flora (TMF) counts were evaluated at days 0, 3, 7, 14, and 24 of storage. The obtained results in this study showed that combining pre-treatment with calcium and alginate coating led to reducing the weight loss and respiration rate of broccoli, maintaining its color and texture as well as extending its shelf-life by 6 days. These results not only allowed reducing post-harvest losses resulting in the loss of the product but also have a major impact on the environment and resources involved in the production process. 相似文献
103.
104.
Dabeka R Fouquet A Belisle S Turcotte S 《Food additives & contaminants. Part A, Chemistry, analysis, control, exposure & risk assessment》2011,28(6):744-753
Lead (Pb), cadmium (Cd) and aluminum (Al) were determined in 437 individual samples of infant formulae, oral electrolytes and 5% glucose solutions available in Canada. In the electrolytes, Cd and Pb concentrations were all below 0.01 and 0.041 ng g(-1), respectively. In the 5% glucose solutions, Pb and Cd levels averaged 0.01 and 0.09 ng g(-1), respectively. Reported on an as-consumed basis, Pb levels in milk- and soya-based formulae averaged 0.90 and 1.45 ng g(-1), respectively, while Cd levels averaged 0.23 and 1.18 ng g(-1), respectively Average Al levels on an as-consumed basis were 440 ng g(-1) (range 10-3400 ng g(-1)) in milk-based formulae and 730 ng g(-1) (range 230-1100 ng g(-1)) in soy-based formulae. Al concentrations increased in the following order: plain formula < low-iron formula < iron-supplemented formula < casein hydrolysate formula ≈ premature formula ≤ soy formula. For example, in the powdered formulae, average Al concentrations were 18 ng g(-1) for plain milk-based, 37 ng g(-1) for low-iron, 128 ng g(-1) for iron supplemented, 462 ng g(-1) for lactose-free, 518 ng g(-1) for hypoallergenic and 619 ng g(-1) for soy-based formula. Al concentrations, as-consumed, increased with decreasing levels of concentration: powder < concentrated liquid < ready-to-use. Formulae stored in glass bottles contained between 100 and 300 ng g(-1) more Al than the same formulae stored in cans. The source of the increased Al did not appear to be the glass itself, because most electrolytes and glucose solutions, also stored in glass, contained less than 8 ng g(-1) Al. Corresponding differences in Pb and Cd levels were not observed. Al concentrations varied substantially among manufacturers; however, all manufacturers were able to produce plain milk-based formulae containing less than 50 ng g(-1) Al, i.e. within the range of Al concentrations found in human milk. Next to soya-based and hypoallergenic formulae, premature formulae contained among the highest concentrations of Al, ranging 851-909 ng g(-1) from one manufacturer and 365-461 ng g(-1) from another. 相似文献
105.
Surface properties and cell adhesion onto allylamine-plasma and amine-plasma coated glass coverslips
Crespin M Moreau N Masereel B Feron O Gallez B Vander Borght T Michiels C Lucas S 《Journal of materials science. Materials in medicine》2011,22(3):671-682
Surface properties of nanoparticles to be used for radioimmunotherapy need to be optimized to allow antibody conjugation while
ensuring biocompatibility. We aimed to investigate cell adhesion and proliferation onto different coatings to be used for
nanoparticles. C, CH
x
or SiO
x
coatings deposited onto glass coverslips by magnetron deposition as well as nitrogen functionalized materials synthetized
using different reactive sputtering conditions and PPAA (plasma polymerized allylamine) coating, were compared. Amine functionalization
did increase hydrophilicity in all the materials tested. Biocompatibility was assessed by measuring cell viability, morphology,
attachment, spreading, and pro-inflammatory cytokine secretion. The results show that C and CN
x
were the most biocompatible substrates while SiO
x
and SiO
x
N
y
were the most toxic materials. PPAA coatings displayed unexpectedly an intermediate biocompatibility. A correlation could
be observed between wettability and cell proliferation except for C coated surface, indicating that more complex processes
than hydrophilicity alone are taking place that affect cell functions. 相似文献
106.
107.
108.
Microstructure and properties of copper and aluminum alloy 3003 heavily worked by equal channel angular extrusion 总被引:21,自引:0,他引:21
Stephane Ferrasse K. Ted Hartwig Ramon E. Goforth Vladimir M. Segal 《Metallurgical and Materials Transactions A》1997,28(4):1047-1057
A technique invented in the former Soviet Union and recently introduced in the United States, called equal channel angular
extrusion (ECAE), produces intense and uniform deformation by simple shear and is applied to 25 × 25 × 152-mm billets of Cu
101 and Al 3003. Microcrystalline structures with a grain size of 0.2 to 0.4 μm are created during room-temperature multipass
ECAE deformation for true strains lying in the range ε=2.31 to 9.24. Evidence shows that intense simple shear deformation
promotes dynamic or continuous recrystallization by subgrain rotation. The effects of the number of extrusion passes and deformation
route for Cu 101, and the deformation route after four passes for Al 3003, are studied. Increasing the number of ECAE passes
in Cu 101 causes strength to reach saturation and grain refinement stabilization after four passes (true strain of 4.68),
and subgrain misorientation to increase as the number of passes increases. For multipass ECAE with billet orientation constant
(route A) or rotated 90 deg between all passes (route B), two levels of structures are created inside the original grains:
shear bands (first level) and very fine subgrains (second level) within the shear bands. For a billet rotation of 180 deg
between passes (route C), an unusual event is observed. At each even numbered pass, shear bands nearly disappear and only
subgrains are present inside the original grains. Route B gives the highest strength, whereas route C produces a more equiaxed
and stable microstructure. Subsequent static recrystallization increases the average grain size to 5 to 10 μm. 相似文献
109.
K. Guenachi A. Hamou N. Hassini Jean-Marc Saiter Stephane Marais E. Beucher 《Materials Research Innovations》2002,6(4):174-178
Sandwinds have been simulated with an apparatus developed in our laboratory. Infra red and UV visible spectroscopies, contact
angle and interferential microscopy investigations have been performed on untreated polyethylene film sample and on samples
submitted at 40 °C to a simulated sandwind for times up to 4 hours. The surface roughness is modified, leading to drastic
decrease of the ultra-violet visible light transmission. This phenomenon is due to the presence of small sand particles inlaid
in the sample surface and due to surface erosion. In the time range of our experiments, no chemical action due to the sandwind
is observed.
Electronic Publication 相似文献
110.