Vibration management of nuclear magnetic resonance equipment
Vibration will affect the image quality of NMR. Steady state vibration and transient vibration can affect NMR. Steady state vibration usually refers to the vibration caused by motors, pumps, air conditioners, etc. Transient vibration usually refers to the vibration caused by vehicles, pedestrians, door opening and closing, etc. Therefore, the site of NMR machine room should be as far away from the vibration sources such as parking lot, highway, subway, train, water pump and large motor as possible.
In order to deal with the vibration problem of nuclear magnetic resonance equipment, after investigation, testing, analysis and research, it is necessary to take active and passive vibration isolation measures. Active vibration isolation is to take vibration isolation measures for surrounding vibration sources that may affect the NMR equipment, so that the vibration generated by these fixed vibration sources can be effectively isolated. Passive vibration isolation is to take vibration isolation measures on the floor or foundation of nuclear magnetic resonance equipment to control the impact of external vibration on nuclear magnetic resonance equipment.
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How to set drainage pipes in toilets
The embedded rigid waterproof bushing also has a defect, that is, it is not allowed to be installed. During the construction phase of flexible waterproof housing, the reference object of the embedded size of the toilet waterproof housing atlas is only the location and size of the beam and pole structure, and the latter often has a tendency. This will lead to the location and size of the embedded casing will also have a tendency, which will bring inconvenience to future construction, Especially for houses with exquisite decoration, because of the large location of drainage pipes, it will often constitute rework and increase costs
For example, the outer diameter of the flexible waterproof shell is 426, the inner diameter of the pipe is 426, and the inner diameter of the pipe is 406. The size of the designed drainage pipe is good, and the outer diameter of the flexible waterproof shell is 480. There is a gap between the installation and the drainage pipe. The filling materials are generally asphalt, asbestos cement, oil tank and other materials, and the general suitable temperature is - 20c-250c
In addition to the standard tendency, the construction unit often considers the high cost of rigid waterproof casing. In addition to the standard tendency, and the high profit, the rigid waterproof casing is set up. As an example, the DN100 rigid waterproof casing is installed according to the quota of the 2003 version. The installation cost is about 127.53 yuan. The embedded casing construction is relatively easy. Therefore, the construction unit often pleads for the use of rigid waterproof casing
There is no casing set, and a method of sticking to the hole is adopted. This method is relatively conventional. During the construction phase, holes are reserved in the form of wooden shells. The pipeline is blocked before installation, and the pipeline itself is properly disposed before blocking. The disposal method is to dispose of the outer wall of the pipeline or apply glue and sand; Waste plastic sealing ring is directly used for the outer wall of the pipe