拉杆箱（角度经典拉链）

Buffer assembly capable of performing multi-directional protection on handbook

The buffering assembly comprises an upper cover and a lower cover, the upper cover is located at one end of the lower cover, L-shaped rods are symmetrically arranged in the upper cover in a sliding mode, friction strips are arranged between the two L-shaped rods and the lower cover in a sliding mode, a rotating groove is formed in the bottom face of the lower cover, and a rotating disc is arranged in the rotating groove. Abutting blocks are symmetrically and fixedly arranged on the upper end face of the rotating disc and abut against the friction strip, a handheld assembly is rotationally arranged on one side of the rotating disc, a notch is formed in the end, close to the upper cover, of the lower cover, a clamping block is fixedly arranged at the end, close to the lower cover, of the upper cover, and the clamping block corresponds to the notch in position; the multifunctional notebook has the advantages that the multifunctional notebook is reasonable in structure, capable of protecting ...

OFDM channel estimation method based on deep convolutional network

The invention discloses an OFDM (Orthogonal Frequency Division Multiplexing) channel estimation method based on a deep convolutional network, which belongs to the technical field of OFDM channel estimation and comprises the following steps: step 1, a communication receiving end performs data processing on received data Y; step 2, establishing an OFDM channel estimation model based on a deep convolutional network, specifically, firstly establishing a channel estimation network based on DenseBlock, namely a DenseBlock-alpha network, then performing transverse expansion on the DenseBlock-alpha network to obtain an MNet-L6 network, and finally performing network training on the MNet-L6 network based on a Keras deep learning framework; and step 3, loading the OFDM channel estimation model based on the deep convolutional network to an OFDM system receiving end to complete a channel estimation task. According to the OFDM channel estimation method based on the deep convolutional network, the DenseBlock ...

Raw material pretreatment process and equipment based on fine chemical engineering

The invention discloses a raw material pretreatment process and equipment based on fine chemical engineering, and relates to the technical field of fine chemical engineering equipment.The raw material pretreatment process comprises the steps that a raw material pretreatment system is constructed, and a raw material object pretreated this time is input; according to the raw material pretreatment method, the raw material pretreatment system is set and constructed, the raw material object of the pretreatment is input during use, the processing technology required by the raw material pretreatment is searched in the system, and the processing technology required by the raw material pretreatment is searched in the system. The raw materials are sequentially processed according to various process links by changing conditions required in process processing according to the requirements of the processed raw materials, so that the requirements of different raw material processing processes are met ...

Device capable of measuring depth of river channel

The utility model discloses a device capable of measuring the depth of a riverway, which comprises a base plate and a telescopic assembly fixed on the side wall of the base plate, a supporting block is fixed on an output shaft of the telescopic assembly, a protective shell is fixed on the upper end face of the supporting block, a rotating rod is rotatably arranged in the protective shell, and a flexible rule is wound on the rotating rod. A steel ball is fixed to the lower end face of the flexible rule, a first hand crank is fixed to the end face of the protection shell, the rotating rod penetrates through the side wall of the protection shell to be fixedly connected with the hand crank, a flexible rule channel pipe is fixed to the side wall of the protection shell, sliding blocks are symmetrically and slidably arranged on the side wall of the flexible rule channel pipe, and clamping rods are symmetrically arranged on the side walls of the lower ends of the sliding blocks. The end, close ...

Waterproof protection mechanism of GNSS receiver

The waterproof protection mechanism of the GNSS receiver comprises a stand column and a body, the body is fixed to the upper end face of the stand column, the stand column is sleeved with a sleeve in a sliding mode, the stand column is fixedly sleeved with a first spring, one end of the first spring is in sliding fit with one end of the sleeve, and the other end of the first spring is in sliding fit with the other end of the sleeve. A containing groove is formed in one end of the stand column, an inserting rod is arranged in the containing groove in a sliding mode, guide rods are symmetrically and fixedly arranged on the outer arc face of the inserting rod, inclined grooves are symmetrically formed in the outer arc face of the stand column, and the guide rods penetrate through the inclined grooves, the guide rods and the inclined grooves to be matched in a sliding mode. The GNSS receiver protection device has the advantages that the structure is reasonable, the GNSS receiver can be protected ...

单酰基氧化膦的制备方法

The preparation process of monoacyl phosphine oxide includes dimetal linkage of organic phosphine, first reaction with R1COC1, subsequent reaction with RXm and oxidation. The preent invention uses PhPCl2, rather than expensive Ph2PCl, and expensive acid-binding agent and thus has low cost; and has short reaction period, yield of about 70%, simple post-treatment, easy purification, no liquid side product produced and monoacyl phosphine oxide product purity as high as 99.0%.

Impurity removal process in lithium carbonate production process

The invention discloses a lithium carbonate production process impurity removal technology which comprises the following steps: S1, slurry prepared during lithium carbonate production is introduced into a magnetism removal mechanism through a magnetic pump to be filtered, and filtered slurry is obtained; after iron in the lithium carbonate slurry is removed, other impurities in the lithium carbonate slurry can be effectively removed by adopting modes of adsorption, cleaning, heating reaction and precipitation filtration, so that the impurity removal effect is improved, the production quality of the lithium carbonate slurry is more favorably improved, and the use requirements are met.