Generally, the customary floor dead load is 10-12 PSF (pounds per square foot) for floors, 12-15 PSF for roof rafters and 20 PSF for roof trusses. However, these may increase when a heavy finish material, such as brick veneer walls or tile floors/roofs, is specified.

2014年11月4日 · We need to convert this to weight on a horizontal projected area, so the shingle weight becomes 2.5 psf times 1.2 or 3.0 psf. This includes the roofing felt that underlies the shingles. Reroofing Allowance: This equals the original roofing weight of 3.0 psf.

2012年11月2日 · Progressive segmented Frame (PsF, sF, SF) is a scheme designed to acquire, store, modify, and distribute progressive scan video using interlaced equipment and media. With PsF, a progressive frame is divided into two segments, with the odd lines in one segment and the even lines in the other segment.

2023年8月24日 · Structural loads can be broadly classified into four groups: dead loads, live loads, impact loads, and environmental loads. These loads are briefly described in the following sections. Dead loads are structural loads of a constant magnitude over time.

如果分子信息的文件我是用pdb和psf，根据vmd教程，轨迹文件使用的是dcd文件格式，但是dcd文件格式是二进制的文件，因此作为自编程的人来说不论是读取还是写入都比较困难，请问是不是pdb搭配psf只能使用dcd轨迹文件，如果不是那么轨迹文件都有哪些选择呢，哪 ...

Table R502.3.1(1) covers sleeping rooms where the design live load is 30 pounds per square foot (psf) (1.44 kPa) per Table R301.5. This includes attics with fixed stair access. It is important to identify the intended use because an attic space used as a bonus room, for example, could require use of a 40-pounds-persquare-foot (1.92 kPa) live load.

• Load requirements are 40 PSF LL and 20 PSF DL • F y = 35 ksi and E = 10e3 ksi for alloy 6061-T6 • Additional material characteristics are to be that of steel, allowing for the same equations

NOTE: These are approximate load conditions based on a truss configuration that may vary. There are several hip configurations. This example demonstrates partial uniform loads. More accuracy could be achieved by taking each truss as an individual point load.

首先PSF是Point Spread Function，点扩散函数，即点光源经过系统后形成的光斑。 即便是没有像差的理想系统，由于孔径带来的衍射因素，点光源也不能汇聚成一个无穷小的点，只能“散成一滩”PSF。 显然，PSF越小越好，理想状态下是无穷小，这样对不同位置的点光源的分辨率最高。 而在没有像差的情况下，光瞳大小决定了PSF的大小。 光瞳越大，PSF越小。 我们可以形象地来理解这件事情：光瞳位置的波前携带着成像的“信息”，波前越大，携带的“信息”越多，那么在像面 …

2016年1月13日 · 运动模糊图像的复原中经常要用到点扩散函数psf,该程序实现求取点扩散函数psf，即实现Matlab中的fspecial函数（求psf），你只要设定好参数length和angle就可以了，调用get_psf()- Motion-blurred images are often used to recover the point spread function psf, the realization of the program to strike ...