Huazhong University of Science and Technology

China University of Geosciences (Wuhan)

Wuhan Zhongke Industrial Research Institute of Medical Science Co., Ltd

Yuting Chen

Tao Chen

Chunjie Yan

Luru Jing

Peng Zhang

Yonghan Zhang

Yixia Wang

Fan Lin

Qiang Li

The invention provides an atrial fibrillation risk prediction system based on heartbeat rhythm signals. A heartbeat rhythm signal preprocessing module obtains heartbeat interval sequence data by calculating the time interval of two adjacent heartbeats. During sample labeling, a positive sample is from heartbeat interval data during the sinus heart rate period of a case with high AF risk, and a negative sample is from heartbeat interval data of a case with low AF risk; and an atrial fibrillation risk prediction model is trained with positive and negative samples and is used to test heartbeat interval data, an AF risk curve between the proportion of positive samples and output probability thresholds is obtained according to the output probabilities of testing samples, the area under the AF risk curve is calculated as the atrial fibrillation risk value, and the value can reflect the atrial fibrillation risk.

Atrial fibrillation risk prediction system based on heartbeat rhythm signals and application thereof

A method for preparing an ultra-light-weight (ULW) proppant usable in the oil and gas industry. The method uses silane coupling agent and organic acid to modify silica fume (SF) to obtain modified SF that is lipophilic and hydrophobic. The modified SF is used as inorganic phase, and the polymerizable monomer is used as organic phase, and the organic-inorganic composite microspheres are obtained through suspension polymerization. The ULW proppant is obtained by drying, screening, and pre-oxidization of the composite microsphere. The ULW proppant has a density of about 1.109 g/cm-1.278 g/cm, which is close to that of water, a crushing rate of &#x3c;5% at 52 Mpa, and a crushing rate of &#x3c;7% at 69 Mpa. In the oil and gas industry application, water or salt water can be used to replace the high viscose guanidine gum as carrier, thus reduced cost of fracturing, and reduced environment pollution.

Method for preparing ultra-light-weight (ULW) proppant applied on oil and gas wells

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Hubei, China

Yuting Chen