Abstract: A method and a system for predicting a medium-long term water demand of a water supply network including: building a gray model; acquiring an urban historical water demand data set; processing the historical water demand data set to obtain a processed water demand data set; inputting the processed water demand data set into the gray model to obtain a medium-long term water demand prediction value; acquiring a medium-long term water demand actual value; obtaining a first prediction error according to the medium-long term water demand prediction value and the medium-long term water demand actual value; inputting the first prediction error into an artificial neutral network model to repeatedly conduct a prediction so as to obtain a second prediction error; predicting a medium-long term water demand of the water supply network according to the medium-long term water demand prediction value and the second prediction error.

Abstract: The present invention provides a biological morph-genetic WO3 photocatalyst and a preparation method and application thereof, and belongs to the technical field of photocatalysis The preparation method of the present invention includes the following steps: impregnating a rice husk into a tungsten source solution, and roasting an obtained solid material after solid-liquid separation to obtain the biological morph-genetic WO3 photocatalyst.

Abstract: The present invention provides a method for separating an organic matter from a natural water body, and belongs to the field of water purification. In the present invention, organic matters in the natural water body are divided into six categories, and three different kinds of resins are used, namely an XAD-7HP macroporous adsorption resin, a 15-WET strong-acid cation exchange resin and an A-23 weak-base anion exchange resin; the XAD-7HP macroporous adsorption resin sequentially adsorbs a hydrophobic neutral (HPON), a hydrophobic base (HPOB) and a hydrophobic acid (HPOA) in the natural water body, then the 15-WET strong-acid cation exchange resin absorbs a hydrophilic base (HPIB), and finally, the A-23 weak-base anion exchange resin adsorbs a hydrophilic acid (HPIA), retaining a hydrophilic neutral (HPIN) in the remaining water body.

Abstract: The present invention discloses a method for retrieving a similar image based on visual saliencies and visual phrases, comprising: inputting an inquired image; calculating a saliency map of the inquired image; performing viewpoint shift on the saliency map by utilizing a viewpoint shift model, defining a saliency region as a circular region which taking a viewpoint as a center and R as a radius, and shifting the viewpoint for k times to obtain k saliency regions of the inquired image; extracting a visual word in each of the saliency regions of the inquired image, to constitute a visual phrase, and jointing k visual phrases to generate an image descriptor of the inquired image; obtaining an image descriptor for each image of an inquired image library; and calculating a similarity value between the inquired image and each image in the inquired image library depending on the image descriptors by utilizing a cosine similarity, to obtain an image similar to the inquired image from the inquired image library.