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A novel framework for predicting non-stationary production time series of shale gas based on BiLSTM-RF-MPA deep fusion model

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Petroleum Science 2024年第5期21卷 3326-3339页

作者： Bin Liang Jiang Liu Li-Xia kang ke Jiang Jun-Yu You Hoonyoung Jeong Zhan Meng State key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum UniversityChengdu610500SichuanChina Xinjiang Oilfield Corporation PetroChinaKaramay 834000XinjiangChina Research Institute of Petroleum Exploration&Development Beijing100086China Chongqing University of Science and Technology Chongqing401331China Department of Energy Resources Engineering Seoul National University.1Gwanak-roGwanakguSeoul08826Republic of Korea Institute of Engineering Research Seoul National UniversitySeoul08826Rpublic of Korea

Shale gas, as an environmentally friendly fossil energy resource, has gained significant commercial development and shows immense potential. However, accurately predicting shale gas production faces substantial challenges due to the complex law of decline, nonlinear and non-stationary features in production data, which greatly repair the robustness of current models in predicting shale gas production time series. To address these challenges and improve accuracy in production forecasting, this paper introduces a novel and innovative approach: a hybrid proxy model that combines the bidirectional long short-term memory(BiLSTM) neural network and random forest(RF) through deep learning. The BiLSTM neural network is adept at capturing long-term dependencies, making it suitable for understanding the intricate relationships between input and output variables in shale gas *** the other hand, RF serves a dual purpose: reducing model variance and addressing the concept drift problem that arises in non-stationary time series predictions made by BiLSTM. By integrating these two models, the hybrid approach effectively captures the inherent dependencies present in long and nonstationary production time series, thereby reducing model uncertainty. Furthermore, the combination of BiLSTM and RF is optimized using the recently-proposed marine predators algorithm(MPA) to fine-tune hyperparameters and enhance the overall performance of the proxy model. The results demonstrate that the proposed BiLSTM-RF-MPA model achieves higher prediction accuracy and demonstrates stronger generalization capabilities by effectively handling the complex nonlinear and non-stationary characteristics of shale gas production time series. Compared to other models such as LSTM, BiLSTM, and RF, the proposed model exhibits superior fitting and prediction performance, with an average improvement in performance indicators exceeding 20%. This innovative framework provides valuable insights for forecastin

关键词： Production forecasting Shale gas BiLSTM-RF-MPA model Nonstationary production time series Deep learning

Two Monte Carlo-based simulators for imaging-system modeling and projection simulation of flat-panel X-ray source

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Nuclear Science and Techniques 2024年第7期35卷 31-46页

作者： Meng-ke Qi Ting He Yi-Wen Zhou Jing kang Zeng-Xiang Pan Song kang Wang-Jiang Wu Jun Chen Ling-Hong Zhou Yuan Xu School of Biomedical Engineering Southern Medical UniversityGuangzhou510515China State key Laboratory of Optoelectronic Materials and Technologies Guangdong Province Key Laboratory of Display Material and TechnologySchool of Electronics and Information TechnologySun Yat-sen UniversityGuangzhou510275China Department of Radiotherapy Guangdong Provincial People’s Hospital(Guangdong Academy of Medical Sciences)Southern Medical UniversityGuangzhou510515China

The advantages of a flat-panel X-ray source(FPXS)make it a promising candidate for imaging *** imaging-system modeling and projection simulation are critical for analyzing imaging performance and resolving overlapping projection issues in *** conventional analytical ray-tracing approach is limited by the number of patterns and is not applicable to FPXS-projection ***,the computation time of Monte Carlo(MC)simulation is independent of the size of the patterned arrays in *** study proposes two high-efficiency MC projection simulators for FPXS:a graphics processing unit(GPU)-based phase-space sampling MC(gPSMC)simulator and GPU-based fluence sampling MC(gFSMC)*** two simulators comprise three components:imaging-system modeling,photon initialization,and physical-interaction simulations in the ***-system modeling was performed by modeling the FPXS,imaging geometry,and *** gPSMC simulator samples the initial photons from the phase space,whereas the gFSMC simulator performs photon initialization from the calculated energy spectrum and fluence *** entire process of photon interaction with the geometry and arrival at the detector was simulated in parallel using multiple GPU kernels,and projections based on the two simulators were *** accuracies of the two simulators were evaluated by comparing them with the conventional analytical ray-tracing approach and acquired projections,and the efficiencies were evaluated by comparing the computation *** results of simulated and realistic experiments illustrate the accuracy and efficiency of the proposed gPSMC and gFSMC simulators in the projection calculation of various phantoms.

关键词： Flat-panel X-ray source(FPXS) Imaging-system modeling Projection simulation Monte Carlo-based simulators

Simulation and experiment of vortex transport properties in a Type Ⅱ superconductor with grain boundary

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Science China(Technological Sciences) 2015年第3期58卷 493-498页

作者： JIANG lai XU WeiWei HUA Tao YU Mei AN DeYue CHEN Jian JIN BiaoBing kang Lin WU PeiHeng Research Institute of Superconductor Electronics School of Electronic Science and Engineering Nanjing University

We firstly described a simulation model to investigate the influence of grain boundary(GB)on the vortex transport properties in YBCO *** is found that the size of inhomogeneous area caused by GB as well as the average velocity in transverse and longitudinal directions shows an angular dependence when the angle between the GB and the sample edge *** have also studied the impact of magnetic field intensity on dynamic behavior of vortex lattice and found that a lower vortex density makes it difficult for the vortex lattice to transfer from pinning state to flow *** the magnetic field is decreased beyond a critical value,sharp jumps and strong fluctuations were observed in the I-V ***,we conducted measurements on a thin film YBa2Cu3O7 with an individual artificial grain boundary to support the simulation process.

关键词： high-Tc superconductor grain boundary vortex dynamic

A Hybrid Approach for Predicting the Remaining Useful Life of Bearings Based on the RReliefF Algorithm and Extreme Learning Machine

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Computer Modeling in Engineering & Sciences 2024年第8期140卷 1405-1427页

作者： Sen-Hui Wang Xi kang Cheng Wang Tian-Bing Ma Xiang He ke Yang School of Mechatronics Engineering Anhui University of Science and TechnologyHuainan232001China Institute of Energy Hefei Comprehensive National Science CenterHefei230031China

Accurately predicting the remaining useful life(RUL)of bearings in mining rotating equipment is vital for mining *** research aims to distinguish the features associated with the RUL of bearings and propose a prediction model based on these selected *** study proposes a hybrid predictive model to assess the RUL of rolling element *** proposed model begins with the pre-processing of bearing vibration signals to reconstruct sixty time-domain *** hybrid model selects relevant features from the sixty time-domain features of the vibration signal by adopting the RReliefF feature selection ***,the extreme learning machine(ELM)approach is applied to develop a predictive model of RUL based on the optimal *** model is trained by optimizing its parameters via the grid search *** training datasets are adjusted to make them most suitable for the regression model using the cross-validation *** proposed hybrid model is analyzed and validated using the vibration data taken from the public XJTU-SY rolling element-bearing *** comparison is constructed with other traditional *** experimental test results demonstrated that the proposed approach can predict the RUL of bearings with a reliable degree of accuracy.

关键词： Bearing degradation remaining useful life estimation RReliefF feature selection extreme learning machine

Graphene oxide and mineralized collagen-functionalized dental implant abutment with effective soft tissue seal and romotely repeatable photodisinfection

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Regenerative Biomaterials 2022年第1期9卷 219-233页

作者： Yichun Gao ke kang Bin Luo Xiaoqing Sun Fang Lan Jing He Yao Wu National Engineering Research Center for Biomaterials Sichuan UniversityChengdu 610064P.R.China

Grasping the boundary of antibacterial function may be better for the sealing of soft tissue around dental implant *** by‘overdone is worse than undone’,we prepared a sandwich-structured dental implant coating on the percutaneous part using graphene oxide(GO)wrapped under mineralized *** unique coating structure ensured the high photothermal conversion capability and good photothermal stability of *** prepared coating not only achieved suitable inhibition on colonizing bacteria growth of Streptococcus sanguinis,Fusobacterium nucleatum and Porphyromonas gingivalis but also disrupted the wall/membrane permeability of free *** enhancements on the antibacterial property were generally observed through the additional incorporation of dimethylaminododecyl ***,the coating with sandwich structure significantly enhanced the adhesion,cytoskeleton organization and proliferation of human gingival fibroblasts,which was effective to improve soft tissue ***,cell viability was preserved when cells and bacteria were cultivated in the same environment by a coculture *** was attributed to the sandwich structure and mineralized collagen as the outmost layer,which would protect tissue cells from photothermal therapy and GO,as well as accelerate the recovery of cell ***,the coating design would provide a useful alternative method for dental implant abutment surface modification and functionalization.

关键词： dental implant abutment soft tissue sealing antibacterial graphene oxide mineralized collagen

Packings and Coverings of λK_v with 2 Graphs of 6 Vertices and 7 Edges

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Journal of Mathematical Research and Exposition 2011年第1期31卷 59-66页

作者： Yan ke DU Qing De kang Institute of Applied Mathematics Mechanical Engineering College Hebei 050003 P. R. China Institute of Mathematics Hebei Normal University Hebei 050016 P. R. China

A maximum （v, G, λ）-PD and a minimum （v, G, λ）-CD axe studied for 2 graphs of 6 vertices and 7 edges. By means of ＂difference method＂ and ＂holey graph design＂, we obtain the result： there exists a （v, Gi,... 详细信息

关键词： G-design G-packing design G-covering design.

A Novel Trajectory Tracking Control of AGV Based on Udwadia-Kalaba Approach

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IEEE/CAA Journal of Automatica Sinica 2024年第4期11卷 1069-1071页

作者： Rongrong Yu Han Zhao Shengchao Zhen kang Huang Xianmin Chen Hao Sun ke Shao the School of Mechanical Engineering Hefei University of TechnologyHefei 230009China the College of Mechanical and Electronic Engineering Shandong University of Science and TechnologyQingdao 266590China the University of Science and Technology of China Hefei 230026China

Dear Editor,This letter is about an automated guided vehicle(AGV)trajectory tracking control method based on Udwadia-Kalaba(U-K)*** method provides a novel,concise and explicit motion equation for constrained mechanical systems with holonomic and/or nonholonomic constraints as well as constraints that may be ideal or *** this letter.

关键词： letter constraints constrained

Impacts of Nutlin-3a and exercise on murine double minute 2-enriched glioma treatment

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Neural Regeneration Research 2025年第4期20卷 1135-1152页

作者： Yisheng Chen Zhongcheng Fan Zhiwen Luo Xueran kang Renwen Wan Fangqi Li Weiwei Lin Zhihua Han Beijie Qi Jinrong Lin Yaying Sun Jiebin Huang Yuzhen Xu Shiyi Chen Department of Sport Medicine Huashan HospitalFudan UniversityShanghaiChina Department of Orthopedic Surgery Hainan Province Clinical Medical CenterHaikou Affiliated Hospital of Central South University Xiangya School of MedicineHaikouHainan ProvinceChina Department of Basic Medicine Shanghai Jiao Tong University School of MedicineShanghai Jiao Tong UniversityShanghaiChina Department of Neurosurgery Second Affiliated Hospital of Zhejiang University School of MedicineZhejiang UniversityHangzhouZhejiang ProvinceChina Department of Orthopedics Shanghai General HospitalSchool of Medicine Shanghai Jiao Tong UniversityShanghaiChina Department of Infectious Diseases Children’s Hospital of Fudan UniversityNational Children’s Medical CenterShanghaiChina Department of Rehabilitation The Second Affiliated Hospital of Shandong First Medical UniversityTaianShandong ProvinceChina

Recent research has demonstrated the impact of physical activity on the prognosis of glioma patients,with evidence suggesting exercise may reduce mortality risks and aid neural *** role of the small ubiquitin-like modifier(SUMO)protein,especially post-exercise,in cancer progression,is gaining attention,as are the potential anti-cancer effects of *** used machine learning to create the exercise and SUMO-related gene signature(ESLRS).This signature shows how physical activity might help improve the outlook for low-grade glioma and other *** demonstrated the prognostic and immunotherapeutic significance of ESLRS markers,specifically highlighting how murine double minute 2(MDM2),a component of the ESLRS,can be targeted by *** underscores the intricate relationship between natural compounds such as nutlin-3 and immune *** comprehensive CRISPR screening,we validated the effects of specific ESLRS genes on low-grade glioma *** also revealed insights into the effectiveness of Nutlin-3a as a potent MDM2 inhibitor through molecular docking and dynamic ***-3a inhibited glioma cell proliferation and activated the p53 *** efficacy decreased with MDM2 overexpression,and this was reversed by Nutlin-3a or *** using a low-grade glioma mouse model highlighted the effect of physical activity on oxidative stress and molecular pathway ***,both physical exercise and Nutlin-3a administration improved physical function in mice bearing tumors derived from MDM2-overexpressing *** results suggest the potential for Nutlin-3a,an MDM2 inhibitor,with physical exercise as a therapeutic approach for glioma *** research also supports the use of natural products for therapy and sheds light on the interaction of exercise,natural products,and immune regulation in cancer treatment.

关键词： exercise and SUMO-related gene signatures(ESLRS) glioblastoma management low-grade glioma natural bioactives neural regeneration physical exercise

Molecular Taxonomy of Conogethes punctiferalis and Conogethes pinicolalis(Lepidoptera: Crambidae) Based on Mitochondrial DNA Sequences

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Journal of Integrative Agriculture 2014年第9期13卷 1982-1989页

作者： WANG Jing ZHANG Tian-tao WANG Zhen-ying HE kang-lai LIU Yong LI Jing State key Laboratory for Biology of the Plant Diseases and Insect Pests Institute of Plant Protection Chinese Academy of Agricultural Sciences College of Plant Protection Shandong Agricultural University

Conogethes punctiferalis（Guenée）（Lepidoptera： Crambidae） was originally considered as one species with fruit-feeding type（FFT） and pinaceae-feeding type（PFT）, but it has subsequently been divided into two different species of Conogethes punctiferalis and Conogethes pinicolalis. The relationship between the two species was investigated by phylogenetic reconstruction using maximum-likelihood（ML） parameter estimations. The phylogenetic tree and network were constructed based upon sequence data from concatenation of three genes of mitochondrial cytochrome c oxidase subunits I, II and cytochrome b which were derived from 118 samples of C. punctiferalis and 24 samples of C. pinicolalis. The phylogenetic tree and network showed that conspecific sequences were clustering together despite intraspecific variability. Here we report the results of a combined analysis of mitochondrial DNA sequences from three genes and morphological data representing powerful evidence that C. pinicolalisand C. punctiferalis are significantly different.

关键词： yellow peach moth Conogethes punctiferalis Conogethes pinicolalis mitochondrial DNA sequence