47results about How to "Rapid sample preparation" patented technology

The invention relates to a grinding device, in particular to a grinder for concrete powder, including a bracket. A motor is arranged on the bracket. A grinding piece is fixedly connected with a rotating shaft of the motor. A test sample holding device is arranged opposite to the grinding piece. The holding device includes a holding clamp and a driving mechanism. The holding clamp includes a holding clamp support. One side of the holding clamp support is provided with a guide rail support, and the other side of the holding clamp support is provided with a fixing clamp. A movable clamp is arranged at a position opposite to the fixing clamp. The movable is connected to a holding clamp handle. The driving mechanism includes a base provided with a guide rail and a first manual rocking handle. The first manual rocking handle is connected to the holding clamp support through a first driving screw rod. The grinding piece, the holding clamp and the driving mechanism are all arranged in a closed tank body. A motor fixing support is arranged below the motor and is provided with through holes. A second driving screw rod is connected to a second manual rocking handle through the through holes. The second manual rocking handle is rotated to drive the motor to slide. The grinding device has the advantages of convenient operation, and higher precision of the prepared sample powder.

The invention discloses a method for determining the content of nitrogen oxide in air byan alkali absorption-Raman spectrometry, and in particularrelates to a Raman spectrometry utilizing alkali to absorb nitrogen oxideand thus calculating the content of nitrogen oxide. The method comprises the following steps: the air continuously flowing through a two-way parallel alkali absorption pipelineat the same flow rate and at the same time to absorb the nitrogen oxide, quantitatively calculating the content of nitrogen oxide in the air by comparing the contents of nitrate in two parts of absorption solutions formed by whether an oxidant solution is introduced through detection. The NO<3+> detection method is the Raman spectroscopy, comprising the steps: taking 717 plus or minus 2cm<-1> as a reference peak,setting the corresponding intensity to 5000, normalizing the linear function of a spectrogram, and determining by using an external standard method according to a corresponding relationship between the nitrate in a sample and relative intensity after normalizing at 1049 plus or minus 2cm<-1>. Compared with the existing method, the method provided by the invention has the advantages of quick sample preparation, repeatability, goodsystem stability, easy obtaining of used reagents, non-toxicity, highdetection anti-interference ability, good specificity, high accuracy and the like.

The invention discloses a sample preparation device for a coarse-grained soil triaxial test, and belongs to the technical field of soil body testing apparatus. The sample preparation device comprises a pressure chamber pedestal, an outer pressure chamber cylinder, a rubber membrane, porous stone, an inner pressure chamber cylinder, an isolating cloth cover, a funnel, a cylindrical compaction device and an annular compaction device, wherein the porous stone is arranged inside a groove in the pressure chamber pedestal; the lower end of the outer pressure chamber cylinder is fixed on the pressure chamber pedestal; the rubber membrane tightly covers the inner surface of the outer pressure chamber cylinder; the inner pressure chamber cylinder for containing coarse aggregates is arranged inside the outer pressure chamber cylinder; the isolating cloth cover tightly covers the outer surface of the inner pressure chamber cylinder. The invention further discloses an application method of the device. The sample preparation device disclosed by the invention cannot cause deformation of the coarse aggregates; meanwhile, the rubber membrane is protected by a sand layer to avoid breakage; the specimen can be prevented from oversize disturbance due to the cylinder lifting process in the pressure chamber; the sample preparation device is quick in specimen filling speed and high in efficiency, and can effectively ensure normal operation of the test.