运用HACCP体系控制梨采后贮藏品质

运用HACCP体系对梨采后贮藏过程中的潜在危害进行了分析,并确定了梨采收、分级、预冷、贮藏四个关键控制点．制定了相应的预防措施和控制方法。实施HACCP计划后,涉及梨果实贮藏的主要工序可达到理想状态．将贮藏过程中的潜在危害降至最低,确保贮藏过程中梨果实的优质和食用安全。     

The Multiple Solutions for a Class of Quasilinear Elliptic Equations

A three critical point theorem is proved. As its applications, Dirichlet problem for a class of quasilinear elliptic equations cf second order is considered.     

Spline Boundary Element Method for Calculating Three-Dimensional Electrostatic Fields

Based on [l].this paper presents a new spline-BEM for calculating 3-D electrostatic fields,in which bi-cubic B-splines are used as basis functions. The corner problem in BEM and the extreme conditions for splines are circumvented. The numerical results presented show that the global approximation .convergence and stability of the method are satisfactory.     

A Globally Convergent Algorithm for Nonlinear Programming

A new globally convergent algorithm was presented for a continuous differen-tiable nonlinear programming by defining a measure function deviating from the Kuhn-Tucker point. With this algorithm which can be used to get the optimum solution of the problem,the optimal lagrangian multiplier corresponding the optimal solution of the problem was also obtained. A new iterative algorithm for quadratic programming is obtained when applying the general algorithm to quadratic programming. Finally,a numerical example was given.     

Discussions on the Bearing Capacity of the Enclosed Reinforced Concrete Strengthened Brick Masonry Column under Axial Compression

The calculation problems of bearing capacity of enclosed reinforced concrete strengthened brick masonry column under axial compression is introduced, which can be available for reference in calculating the bearing capacity of enclosed reinforced concrete strengthened brick masonry column.     

HACCP在热灌装饮料生产中的应用

简要介绍了HACCP体系的主要内容,并将其应用于热灌装绿茶饮料的生产过程当中,从品管的角度分析产品的危害因素,确定了关键控制点。通过HACCP体系在热灌装绿茶饮料中的应用,可有效控制热灌装绿茶饮料的质量,提高产品的安全性,同时也可以提高全员素质。     

The effect of temperature and other factors on chlorophyll a fluorescence and the lower oxygen limit in apples (Malus domestica)

The effects of temperature, scan interval and rate of oxygen (O₂) decline on pulse frequency modulation (PFM)-based minimum fluorescence (F_α) and the F_α-based lower oxygen limit (LOL) were investigated using ‘Honeycrisp’ apples (Malus × domestica Borkh). The effects of temperature and hypoxic stress on pulse amplitude modulation (PAM) fluorescence parameters were also investigated. The PFM scan interval had no effect on the F_α baseline, but increases in the scan interval decreased the low-O₂-induced fluorescence spike intensity (ΔF_α). Temperature negatively correlated with the F_α baseline while ΔF_α °C⁻¹ was greater at lower than at higher temperatures. When using a PAM fluorometer, the minimum fluorescence (F_o), and to a lesser extent the maximum fluorescence (F_m), were similarly affected by temperature as was F_α. Temperature altered the LOL in fruit. Apples stored at 20, 10, 3.5 and 0 °C spiked at 0.72, 0.33, 0.22 and 0.08 kPa O₂, respectively, under a rapid O₂ decline (i.e., 20.9 to <1 kPa O₂ in ≈5–6 h). Although the low-O₂ F_α spike apex values did not change with temperature, the spike intensity increased with temperature due to a reduced fluorescence baseline. A slower O₂ decline rate produced slightly higher LOL and lower spike intensity values. In conclusion, temperature and rate of O₂ decline affected the low-O₂-induced PFM fluorescence spike intensity as well as the LOL, while the PFM scan interval affected the spike intensity.     

原竹对剖联丝展开重组技术的推广

阐述了原竹对剖联丝展开重组技术的工艺流程,指出新工艺减少了加工工序,提高了竹材利用率和竹青面耐磨性,降低了生产成本;从原竹对剖联丝展开重组技术制备的层积材性能与特点,分析了新工艺的创新点,并从经济效益和社会效益两点分析了新技术的可行性。重组技术的推广应用,竹制品行业将大大提高竹材利用率,降低生产成本,实现产品换代升级,企业更具有生命力。     

无人机森林航摄影像三维点云估测林分蓄积量研究

森林蓄积量能够评估林地生产力的高低及经营措施的效果,为森林经营与采伐提供重要依据。目前,大多基于无人机影像的蓄积量估算,均建立在测绘标准所生成的DOM、DSM、DEM等测绘成果基础上,而未充分利用原始影像数据上的林业特征,无法从点云层面上加入林业业务逻辑产生成果数据。获取无人机影像后,利用特征点提取与匹配方法自动相对定向,结合控制点和光束法平差的迭代求解,解算出精确的相机姿态数据,并沿核线方向一维搜索特征点进行影像密集匹配生成密集点云。对原始三维点云过滤后进行树冠分割,在聚类后的林冠点云中提取了树顶点和树高因子估测了森林蓄积量。研究结果表明,冠幅的提取精度85.15%,树高的提取精度83.69%,林分蓄积量估算的精度达到了82.46%。