Abstract: A ventilation and noise reduction housing and assembly, a ventilation and moisture retention apparatus, a breathing mask assembly and a breathing support device are provided. The ventilation and noise reduction housing includes a respiratory passage segment, one end thereof is a ventilation and noise reduction housing connection end, and the other end thereof is a respiratory tube communication end. The wall of the respiratory passage segment includes a mounting wall segment, that is provided with exhaust vents and a supporting protrusion structure protruding from the outer surface of the mounting wall segment, the supporting protrusion structure is used for supporting a ventilation and noise reduction core of a ventilation and noise reduction unit provided on the mounting wall segment, such that a ventilation gap is at least partially maintained between the ventilation and noise reduction core and the outer surface of the mounting wall segment.

Abstract: An intelligent test system for traffic load engineering detection of road construction comprises a support part; a sample box part used for containing samples and carrying out a load test in a vertical direction and a direct-shear test in a horizontal direction; a simulated road load applying part used for applying multiple simulated road loads to the samples; a vertical load applying part used for providing multiple loads in the vertical direction for the samples; a horizontal load applying part used for providing loads in the horizontal direction for the sample box part; an automatic sand-compaction part used for quantitatively compacting the samples layer by layer; a water-level fluctuation part used for simulating rising and falling of a tide level; a dry-wet cycle part used for simulating a rain and a sunlight; and an acquisition part used for acquiring data generated during the test.

Abstract: Disclosed is a method for encoding DNA/RNA sequences based on bidirectional trinucleotide position-specific propensities and pointwise joint mutual information, which consists of the steps: constructing the nucleotide position-specific propensity matrix of DNA/RNA sequences; constructing the bidirectional dinucleotide position-specific propensity matrix of DNA/RNA sequences; constructing the bidirectional trinucleotide position-specific propensity matrix of DNA/RNA sequences; determining the value of pointwise joint mutual information of the nucleotides of DNA/RNA sequences; concatenating features and encoding DNA/RNA sequences. In order to extract more position information of trinucleotides from DNA/RNA sequences, a parameter ? is introduced to represent the distance between the current nucleotide and its forward or backward adjacent dinucleotide, the numerical feature vectors obtained from different values of ? are concatenated into a high-dimensional numerical feature vector.