scholarly journals STUDY ON THE WARM-COOL AND DRY-WET FEELING OF STRAW BOARD SURFACE

Wood Research ◽  
2020 ◽  
Vol 65 (2) ◽  
pp. 221-230 ◽  
Author(s):  
Xianqing Xiong ◽  
Yiting Niu ◽  
Qingru Ma ◽  
Yuting Pan
Keyword(s):  
Board Surface

Lead-Free Board Surface Finishes

2007 ◽  
pp. 221-269 ◽  
Author(s):  
Hugh Roberts ◽  
Kuldip Johal
Keyword(s):  
Lead Free ◽  
Surface Finishes ◽  
Board Surface

Crack Analysis and Node Design Improvements for Polystyrene Outer Insulation System

2012 ◽  
Vol 174-177 ◽  
pp. 1273-1276
Author(s):  
Qi Shun Liu
Keyword(s):  
Surface Cracks ◽  
Exterior Wall ◽  
Detailed Structure ◽  
Insulation System ◽  
Practical Applications ◽  
Board Surface ◽  
Structure Treatment ◽  
Insulation Effect ◽  
Composite Wall ◽  
Wall System

As a new composite wall system, because of advanced structure, excellent polystyrene insulation board, insulation effect, light weight, the simple and flexible construction method and well adaptability, polystyrene insulation board thin coating of exterior wall thermal insulation technology is widely used in China. In practical applications, thermal bridges and the board surface cracks that caused by improper handling of deformation joints and detailed structure are the main problem of the technology. In this paper, many problems are analyzed such as the crack causes, the plates overlap and the node structure treatment, and also corresponding solutions are proposed.

A Theoretical Analysis of Timber Drying in Oscillating Climates

Holzforschung ◽  
2003 ◽  
Vol 57 (4) ◽  
pp. 427-432 ◽  
Author(s):  
J.-G. Salin
Keyword(s):  
Surface Layer ◽  
Theoretical Analysis ◽  
Simulation Model ◽  
Driving Forces ◽  
Point Of View ◽  
Drying Rate ◽  
Drying Time ◽  
Practical Point ◽  
Board Surface ◽  
External Driving

Summary In this study the influence of oscillating climates on the drying of timber is investigated theoretically. First, the effect of oscillations superimposed on an ordinary drying schedule is examined by solving the corresponding partial differential equations. It is shown that the average drying rate is not affected by the oscillations. Second, properly selected oscillation amplitudes and frequencies can result in enhanced mechano-sorptive creep in the board surface layer, which enables increased external driving forces with an unchanged risk of checking. This method is analysed by using a drying simulation model. It is shown that substantial reductions in the drying time can be obtained in theory. From a practical point of view the benefit is probably rather marginal.

Optimal Shock Pulse in a Drop Test Simulation of Standardized Board for Uniform Shock Response

2016 ◽  
Vol 138 (4) ◽  
Author(s):  
Sharan Kallolimath ◽  
Jiang Jenny Zhou
Keyword(s):  
Solder Joint ◽  
Strain Rate ◽  
Surface Strain ◽  
Drop Test ◽  
Shock Pulse ◽  
Uniform Stress ◽  
Time Step ◽  
Physical Test ◽  
Calibration Methods ◽  
Board Surface

Board-level physical test performance of CSP/BGA packages need in depth characterization of loading parameters and material behavioral properties. In recent years, many calibration methods were adopted by the researchers and industries to improvise solder joint performances of packages. Effective and uniform board response is one of the critical challenges in developing test board to qualify package components for solder joint reliability qualification. In this paper, an improvised board type alternative to standard Joint Electron Device Engineering Council (JEDEC) board is developed for uniform stress/strain response. An axis symmetrical board is chosen in comparison to the current JEDEC board. The effectiveness of the two boards are compared with each other under extreme banding under controlled drop test simulation. The uniform stress–stain distribution is recorded maintaining the no-ring phenomenon by selecting optimal shock pulse parameters. Selected impact/shock pulse is decided by identifying the maximum impact energy absorbed by the board during the drop event. Board surface strain and stress data are captured 1–2 mm away near the components are quantified for higher strain rate. The board local strain rate on the board surface is recorded at a selected time-step to quantify the dynamic stresses along the component side surface on the board. The simulation is performed by using ANSYS software using implicit method. Both linear SOLID45 and quadratic SOLID95 elements are used to compare and correlate the results. Close forms of results were correlated with the previous theoretical results.

Campylobacter Transfer from Naturally Contaminated Chicken Thighs to Cutting Boards Is Inversely Related to Initial Load

2009 ◽  
Vol 72 (9) ◽  
pp. 1836-1840 ◽  
Author(s):  
PHILIPPE FRAVALO ◽  
MARIE-JOSE LAISNEY ◽  
MARIE-ODILE GILLARD ◽  
GILLES SALVAT ◽  
MARIANNE CHEMALY
Keyword(s):  
Confidence Interval ◽  
Linear Relationship ◽  
High Density Polyethylene ◽  
Quantitative Data ◽  
Transfer Rate ◽  
High Density ◽  
Initial Load ◽  
Board Surface ◽  
Cutting Boards

Foods prepared in the kitchen can become cross-contaminated with Campylobacter by contacting raw products, particularly skinned poultry. We measured the percent transfer rate from naturally contaminated poultry legs purchased in supermarkets. Transfer of Campylobacter from skin (n = 43) and from meat (n = 12) to high-density polyethylene cutting board surfaces was quantitatively assessed after contact times of 1 and 10 min. The percent transfer rate was defined as the ratio between the number of Campylobacter cells counted on the cutting board surface and the initial numbers of Campylobacter naturally present on the skin (i.e., the sum of Campylobacter cells on the skin and board). Qualitative transfer occurred in 60.5% (95% confidence interval, 45.5 to 75.4) of the naturally contaminated legs studied and reached 80.6% (95% confidence interval, 63.0 to 98.2) in the subpopulation of legs that were in contact with the surface for 10 min. The percent transfer rate varied from 5 × 10−2% to 35.7% and was observed as being significantly different (Kruskall-Wallis test, P < 0.025) and inversely related to the initial counts on poultry skin. This study provides quantitative data describing the evolution of the proportion of Campylobacter organisms transferred from naturally contaminated poultry under kitchen conditions. We emphasize the linear relationship between the initial load of Campylobacter on the skin and the value of the percent transfer rate. This work confirms the need for modeling transfer as a function of initial load of Campylobacter on leg skin, the weight of poultry pieces, and the duration of contact between the skin and surface.

Predictive Migration Model for Organic Contaminants from Printed Paper (Board) Food Packaging Materials into Food

2015 ◽  
Vol 731 ◽  
pp. 471-475
Author(s):  
Mei Gui Xue ◽  
Le Yuan Tian ◽  
Yu Chun Yang ◽  
Shuang Fei Wang
Keyword(s):  
Organic Contaminants ◽  
Food Packaging ◽  
Storage Time ◽  
Experimental Tests ◽  
Linear Coefficient ◽  
Migration Model ◽  
Food Simulants ◽  
Board Surface ◽  
Printing Inks ◽  
Experimental Values

The organic contaminants which in the printing inks or varnish of paper (board) surface can migrate via paper (board) to the packed food (simulants) in the form of gases and do harm to the health of consumers.To predict the concentration of them in the packed food (simulants) at a given storage time, the migration model of them was established. For a sheet of paper consists of several layers of interlaced fibers, the organic contaminants can be traped by the fibers when they penetrate to the inner layers by the capillaries in the printing process, so the linear coefficient of retardationRmwas introduced to modify the Fick’s Laws, and the diffusion equationwas gotten. It demonstrated that the values ofRmincrease with the increasing of molecular weight of surrogates, and decrease with the increasing of migration temperature. And the diffusion coefficientsDpof phenol, 2, 6-Dissopropyl naphthalenes (2,6-DIPNs) and dibuthyl phthalate (DBP) in the kraft paper board were range from 10-5to 10-4at 75°C and 100°C. Then the migration model was validated by migration experimental tests, and the model described the profile of the experimental values very well.

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