56 research outputs found
Foodborne Illness
No full textFoodborne illnesses are a significant public health challenge in the world. Preventing foodborne disease in meat processing is an essential point to insure food safety and quality. HACCP systems currently are used for food processor to identify food safety hazards and prevent food is contaminated. By the introducing HACCP system into China in 1990s, Chinese government and enterprises have took more attention to control and monitoring the flow of food to insure food quality in processors. Meat processing is one main part of food production industry in China, Yurun Group is one of the largest meat product enterprises of China. Through the case about application of HACCP system in 320g cooked sausage processing of Yurun Group to analysis the actual theoretical knowledge and experiment to prevent hazards and monitor the critical control points (CCPs) in meat processing.Foodborne illnesses are a significant public health challenge in the world. Preventing foodborne disease in meat processing is an essential point to insure food safety and quality. HACCP systems currently are used for food processor to identify food safety hazards and prevent food is contaminated. By the introducing HACCP system into China in 1990s, Chinese government and enterprises have took more attention to control and monitoring the flow of food to insure food quality in processors. Meat processing is one main part of food production industry in China, Yurun Group is one of the largest meat product enterprises of China. Through the case about application of HACCP system in 320g cooked sausage processing of Yurun Group to analysis the actual theoretical knowledge and experiment to prevent hazards and monitor the critical control points (CCPs) in meat processing
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Nontraditional approximation in geophysical fluid dynamics
No full texttextIn the conventional approach to geophysical fluid dynamics, only the horizontal components of the Coriolis force due to horizontal motions of the fluid are taken into account. All the other components of the Coriolis force, which are called the non-traditional (NT) terms, are considered to be small second order quantities and are usually dropped. This effectively simplifies the system and the nice and clean quasi-geostrophic (QG) equation can be obtained, which is widely used in analytical studies of climate systems. Interest has been drawn to the dropped terms in recent studies. It is shown that in some special cases these second order terms actually have a noticeable influence on the dynamics of the system. However, a full picture of these terms in the dynamics of the real ocean is still lacking. Here, we will start from the fundamental equations of fluid dynamics, and through careful scaling analysis conduct a detailed study of the governing equations of geophysical fluid dynamics while keeping the NT terms. We will specifically investigate the influence of these NT terms on equatorial waves, since near the equator the NT components of the Coriolis force are the most significant.Physic
Richard FitzpatrickNontraditional Approximation in Geophysical Fluid Dynamics
No full textIn the conventional approach to geophysical fluid dynamics, only the horizontal components of the Coriolis force due to horizontal motions of the fluid are taken into account. All the other components of the Coriolis force, which are called the non-traditional (NT) terms, are considered to be small second order quantities and are usually dropped. This effectively simplifies the system and the nice and clean quasi-geostrophic (QG) equation can be obtained, which is widely used in analytical studies of climate systems. Interest has been drawn to the dropped terms in recent studies. It is shown that in some special cases these second order terms actually have a noticeable influence on the dynamics of the system. However, a full picture of these terms in the dynamics of the real ocean is still lacking. Here, we will start from the fundamental equations of fluid dynamics, and through careful scaling analysis conduct a detailed study of the governing equations of geophysical fluid dynamics while keeping the NT terms. We will specifically investigate the iv influence of these NT terms on equatorial waves, since near the equator th
A box model test of the freshwater forcing hypothesis of abrupt climate change and the physics governing ocean stability
No full textAuthor Posting. © American Geophysical Union, 2010. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Paleoceanography 25 (2010): PA4222, doi:10.1029/2010PA001936.Observations and an ocean box model are combined in order to test the adequacy of the freshwater forcing hypothesis to explain abrupt climate change given the uncertainties in the parameterization of vertical buoyancy transport in the ocean. The combination is carried out using Bayesian stochastic inversion, which allows us to infer changes in the mass balance of Northern Hemisphere (NH) ice sheets and in the meridional transports of mass and heat in the Atlantic Ocean that would be required to explain Dansgaard-Oeschger Interstadials (DOIs) from 30 to 39 kyr B.P. The mean sea level changes implied by changes in NH ice sheet mass balance agree in amplitude and timing with reconstructions from the geologic record, which gives some support to the freshwater forcing hypothesis. The inversion suggests that the duration of the DOIs should be directly related to the growth of land ice. Our results are unaffected by uncertainties in the representation of vertical buoyancy transport in the ocean. However, the solutions are sensitive to assumptions about physical processes at polar latitudes.This material is based upon work supported
by the National Science Foundation under grant OCE‐0402363 and Department
of Energy grant DE‐FG02‐08ER64619
Research on the Absolute Measurement Methodology of Air Kerma for N-60～N-350 X-Rays
No full textWith the rapid development of nuclear technology applications，the demand for medium- to high-energy X-rays has been increasing substantially，accompanied by urgent requirements for absolute measurement capabilities and measurement ranges of air kerma rates under narrow-spectrum (60-350) kV conditions. This study systematically calculates and analyzes the correction factors and associated uncertainties required for absolute air kerma measurements of N-60～N-350 standard radiation qualities using the medium-energy free-air ionization chamber established at the China Institute of Atomic Energy. The investigation employs a comprehensive methodology integrating experimental measurements，theoretical calculations，and Monte Carlo simulations. Through this research，the reproduction of air kerma values for N-series X-ray standard radiation qualities has been successfully achieved，yielding air kerma rate values at 1 meter from the focal spot under N-60～N-350 radiation qualities. Subsequently，uncertainty evaluation using the GUM method demonstrates that the relative standard uncertainty of the reproduced quantity values reaches 0.52%. Furthermore，preliminary verification of measurement accuracy has been conducted through calibration factor comparisons，thereby validating the reliability of the reproduced quantity values
Method of preparation of ultrathin metal-organic frameworks & uses thereof
No full textThe invention relates to methods for the preparation of ultrathin metal-organic frameworks (MOFs), in particular Zeolitic imidazolate frameworks (ZIFs) and uses thereof and resulting products thereof, in particular useful for the preparation of gas separation membranes, in particular for H2 sieving.AVP-R-TTOAlternative title(s) : (fr) Procédé de préparation de structures organométalliques ultraminces et leurs utilisation
Electromagnetic and wave absorbing properties of Fe-doped polymer-derived SiCN ceramics
No full textFe-doped polymer-derived SiCN ceramics were synthesized by a precursor conversion method with different contents of nano-Fe2O3.</p
Method of preparation of ultrathin metal-organic frameworks & uses thereof
No full textThe invention relates to methods for the preparation of ultrathin metal-organic frameworks (MOFs), in particular Zeolitic imidazolate frameworks (ZIFs) and uses thereof and resulting products thereof, in particular useful for the preparation of gas separation membranes, in particular for H2 sieving.AVP-R-TTOAlternative title(s) : (de) Verfahren zur herstellung ultradünner metallorganischer gerüste und verwendungen davon ; (fr) Procédé de préparation de structures organométalliques ultraminces et leurs utilisation
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