Product Description Drilling Bits,Masonry Drill Bit,Metal Drill Bit,Diamond Drill Bit JIANGSU XI TEC ENVIRONMENTAL&DRILLING EQUIPMENT COMPANY CO.LTD , https://www.xitecdrilling.com
1. Description
In the drilling process, the drill bit is the main tool to break the rock and the wellbore is formed by the drill bit breaking the rock. How well a wellbore is formed and the length of time it takes are not only related to the characteristics of the rock in the drilled formation and the performance of the drill bit itself, but also to the degree of mutual matching between the drill bit and the formation. Reasonable selection of drill bits plays an important role in increasing the drilling speed and reducing the overall cost of drilling.
The drill bit is one of the important tools for oil drilling work. Whether the drill bit adapts to the rock properties and its quality plays a very important role in the selection of drilling technology, especially in terms of drilling quality, drilling speed and drilling cost.
2. Specifications we can offer
At present, there are many types of drill bits used in the petroleum industry and mining industry. The drill bits are classified according to different drilling methods. They can be divided into PDC drill bits, roller cone bits, scraper bits and mining diamond coring bits. These drill bits are the most basic drill bits and we all can provide.
[ Instrument network instrument development ] Fipronil (fipronil) is a broad-spectrum, high-efficiency and long-lasting phenylpyrazole insecticide, which has been widely used in seed treatment, pest control and animal health protection. However, the use of fipronil insecticides can lead to egg contamination, which is toxic to humans. At present, the use of gas chromatography-mass spectrometry, liquid chromatography-mass spectrometry and other traditional methods to detect fipronil in eggs is complicated, but the sensitivity is not sufficient by ordinary Raman spectroscopy.
Recently, Professor Huang Qing of the Institute of Technical Biology has developed a new label-free surface-enhanced Raman spectroscopy (SERS) method, which can rapidly detect fipronil residues in eggs based on SiO2@Au core/shell nanoparticles. The relevant results were published in the analytical chemistry journal Talanta.
The research group prepared a highly sensitive translucent SERS substrate with uniform assembly of SiO2@Au nanoparticles. The fipronil-contaminated egg membrane was directly placed on the substrate, and the SERS measurement was directly performed. The SERS spectrum of fipronil residue was obtained. Bands such as 1583, 1422, 1307 and 867 cm-1 appeared in the model; the structure and spectrum of fipronil molecules were calculated by density functional theory (DFT), and the Raman spectra of these features were identified and verified.
Studies have shown that measurements and analysis at low levels of 10-7M can be achieved. This work also provides new ideas and solutions for detecting pesticides or other contaminants in foods other than eggs.