检索结果-南通市图书馆

A multiscale adaptive framework based on convolutional neural network:Application to fluid catalytic cracking product yield prediction

引用

Petroleum Science 2024年第4期21卷 2849-2869页

作者： Nan Liu Chun-meng zhu meng-Xuan Zhang Xing-Ying Lan College of Artificial Intelligence China University of Petroleum(Beijing)Beijing102249China State Key Laboratory of Heavy Oil Processing China University of Petroleum(Beijing)Beijing102249China

Since chemical processes are highly non-linear and multiscale,it is vital to deeply mine the multiscale coupling relationships embedded in the massive process data for the prediction and anomaly tracing of crucial process parameters and production *** the integrated method of adaptive signal decomposition combined with time series models could effectively predict process variables,it does have limitations in capturing the high-frequency detail of the operation state when applied to complex chemical *** light of this,a novel Multiscale Multi-radius Multi-step Convolutional Neural Network(Msrt Net)is proposed for mining spatiotemporal multiscale ***,the industrial data from the Fluid Catalytic Cracking(FCC)process decomposition using Complete Ensemble Empirical Mode Decomposition with Adaptive Noise(CEEMDAN)extract the multi-energy scale information of the feature ***,convolution kernels with varying stride and padding structures are established to decouple the long-period operation process information encapsulated within the multi-energy scale ***,a reconciliation network is trained to reconstruct the multiscale prediction results and obtain the final *** Net is initially assessed for its capability to untangle the spatiotemporal multiscale relationships among variables in the Tennessee Eastman Process(TEP).Subsequently,the performance of Msrt Net is evaluated in predicting product yield for a 2.80×10^(6) t/a FCC unit,taking diesel and gasoline yield as *** conclusion,Msrt Net can decouple and effectively extract spatiotemporal multiscale information from chemical process data and achieve a approximately reduction of 30%in prediction error compared to other time-series ***,its robustness and transferability underscore its promising potential for broader applications.

关键词： Fluid catalytic cracking Product yield Data-driven modeling Multiscale prediction Data decomposition Convolution neural network

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Asymptotic analysis of a nonlinear stochastic eco-epidemiological system with feedback control

引用

Applied Mathematics(A Journal of Chinese Universities) 2022年第3期37卷 317-339页

作者： ZHANG Sheng-qiang meng Xin-zhu College of Mathematics and Systems Science Shandong University of Science and TechnologyQingdao 266590China Business School University of Shanghai for Science and TechnologyShanghai 200093China

This paper proposes a new stochastic eco-epidemiological model with nonlinear incidence rate and feedback ***,we prove that the stochastic system has a unique global positive ***,by constructing a series of appropriate stochastic Lyapunov functions,the asymptotic behaviors around the equilibria of deterministic model are obtained,and we demonstrate that the stochastic system exists a stationary Markov ***,the conditions for persistence in the mean and extinction of the stochastic system are ***,we carry out some numerical simulations with respect to different stochastic parameters to verify our analytical *** obtained results indicate that the stochastic perturbations and feedback controls have crucial effects on the survivability of system.

关键词： stochastic eco-epidemiological model stationary markov process feedback controls asymptotic behavior persistence in the mean

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

The breeding of japonica rice in northern China: An 11-year study(2006–2016)

引用

Journal of Integrative Agriculture 2020年第8期19卷 1941-1946页

作者： CUI Yue zhu meng-meng XU Zheng-jin CHEN Wen-fu Rice Research Institute of Shenyang Agricultural University Shenyang 110866P.R.China

The world’s population is facing food shortages due to climate change and the competition for arable land between food and energy *** national and international projects to develop"super rice"cultivars were established in recent decades to attain a‘third leap forward’in rice *** order to evaluate the breeding process in northern China,an 11-year tracking survey of japonica rice breeding,which involved a total of 520 rice accessions and 67 test plots,was completed in this *** results showed that the yields of these accessions had increased stably,which was similar to control check varieties(CKs).The breeding strategy reduced the panicle number and increased the grain number per panicle through an increase of spikelet density(number of grains per centimeter on the panicle).This high spikelet density benefits not only the yield but also the blast resistance and amylose *** higher latitudes,the preferred rice accessions had slim grain shape and extended growth *** the middle latitudes among the test plots,the breeders focused on reducing the amylose content to improve the cooking quality of the rice *** and blast resistance were the two highest priorities during the breeding selection *** present study evaluated the breeding process in northern China during the last decade,which may lead to new insights into the future of rice breeding.

关键词： rice japonica breeding decade test northern China

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

A perspective on general direction and challenges facing antimicrobial peptides

引用

Chinese Chemical Letters 2017年第4期28卷 703-708页

作者： meng zhu Peng Liu Zhong-Wei Niu Key Laboratory of Photochemical Conversion and Optoelectronic Materials Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China

The emergence of drug resistant bacterium threatens the global public healthcare *** urgent need to obtain new antimicrobials has driven antimicrobial peptides（AMPs） research into *** we give a brief introduction of the recent progress of AMPs regarding their structures,properties,production and modification,and antimicrobial ***,this review will give an insight into the trends and challenges facing on this particular kind of antimicrobial materials.

关键词： Antimicrobial peptides(AMPs) Drug resistance Biomaterials Antimicrobial materials Antimicrobial mechanism

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Thorium distribution on the Moon:new insights from Chang’E-2 gamma-ray spectrometer

引用

Research in Astronomy and Astrophysics 2019年第6期19卷 1-14页

作者： meng-Hua zhu Jin Chang Tao Ma State Key Laboratory of Lunar and Planetary Sciences Macao University of Science and Technology Taipa Macao China Purple Mountain Observatory Chinese Academy of Sciences Nanjing 210034 China CAS Center for Excellence in Comparative Planetology Hefei 230026 China

We present the thorium distribution on the lunar surface derived from observations by the Chang’E-2 gamma-ray spectrometer(CE-2 GRS). This new map shows a similar thorium distribution to previous observations. In combination with this new thorium map and impact cratering model, we investigate the origination of thorium on the Moon’s highlands, which was previously thought to be contributed from Imbrium ejecta. We found that the Imbrium ejecta has a small contribution(~20%–30%) to the thorium on the lunar highlands but most thorium is likely to be indigenous before the deposition of the Imbrium ejecta. This new thorium map also confirms that the eastern highlands have a relatively higher thorium concentration than the western highlands. We propose that the thin crust and large basins on the eastern highlands are responsible for this difference in thorium.

关键词： Moon-Chang'E-2 Gamma-ray Spectrometer-Thorium distribution

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Recent progress on green electromagnetic shielding materials based on macro wood and micro cellulose components from natural agricultural and forestry resources

引用

Nano Research 2022年第8期15卷 7506-7532页

作者： Chuanyin Xiong Tianxu Wang Yongkang Zhang meng zhu Yonghao Ni College of Bioresources Chemical&Materials Engineering Shaanxi University of Science and TechnologyXi’an 710021China Limerick Pulp&Paper Ctr University of New BrunswickFrederictonNB E3B 5A3Canada

Recent research efforts in the field of electromagnetic interference shielding(EMI)materials have focused on biomass as a green and sustainable *** specifically,wood and cellulose nano fiber(CNF)have many advantages,some of which include lightweight,porosity,widespread availability,low cost,and easy *** favorable properties have led researchers to consider these types of biomass as an EMI shielding material with great *** present,while many excellent published works in EMI shielding materials have investigated wood and CNF,this research area is still new,compared with non-biomass EMI shielding *** specifically,there is still a lack of in-depth research and summary on the preparation process,pore structure regulation,component optimization,and other factors affecting the EMI shielding of wood and CNF based EMI shielding ***,this review paper presents a comprehensive summary of recent research on wood and CNF based EMI shielding materials in recent three years in terms of the preparation methods,material structure design,component synergy,and EMI mechanism,and a forward future perspective for existing problems,challenges,and development *** ultimate goal is to provide a comprehensive and informative reference for the further development and exploration of biomass EMI shielding materials.

关键词： biomass materials wood and nano cellulose fiber electromagnetic interference shielding pore structure regulation component synergy

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

High retention volume covalent organic polymer for xenon capture:Dynamic separation of Xe and Kr

引用

Green Energy & Environment 2022年第5期7卷 948-956页

作者： Qian Wang zhu meng Juntao Li Shuming Peng Zhonghua Xiang Institute of Nuclear Physics and Chemistry China Academy of Engineering PhysicsMianyangSichuan621900China State Key Laboratory of Organic-Inorganic Composites Beijing University of Chemical TechnologyBeijing100029China Department of Chemistry Imperial College London20 Gordon StreetLondonWC1H0AJUK Department of Chemistry University College LondonLondonW120BZUK

Xenon capture and Xe/Kr separation are important processes in *** instance,Xe/Kr separation is an indispensable step in recycle and treatment of nuclear fuel *** different separation methods,selectively adsorb gas molecules using porous materials is a promising way to reduce the high energy consumption in traditional cryogenic ***,many reported adsorbents still face the challenges of:ⅰ) poor separation property at low Xe/Kr concentrations;ⅱ) insufficient retention volumes,which influence the viability of whole *** this work,we present a stable covalent organic polymer,i.e.,COP-14,showing promising potential for Xe/Kr *** dynamic breakthrough experiments,COP-14 successfully separates low concentration Xe(350 ppm) and Kr(35 ppm) from target gas ***,the xenon retention volume per gram(1700 mL g^(-1) at 298 K) of COP-14 in dynamics absorption process achieves 3.8 times of benchmark active *** good performance of the newly devloped COP-14 mainly from its rich nitrogen sites and suitable pore size with xenon *** promising results of COP-14 on Xe/Kr separation in this work provide a promising way for designing efficient Xe/Kr separation mateirals.

关键词： process separation retention

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Vegetation characteristics and soil properties of artificially remediated grasslands:The case study of the Shimenhe mining area in Qilian Mountains,northwest China

引用

Research in Cold and Arid Regions 2024年第4期16卷 190-200页

作者： XiaoMei Yang Qi Feng meng zhu Key Laboratory of Ecohydrology of Inland River Basin Alax Desert Eco-hydrology Experimental Research StationQilian Mountains Eco-Environment Research Center in Gansu ProvinceNorthwest Institute of Eco-Environment and ResourcesChinese Academy of Sciences(CAS)LanzhouGansu 730000China

The mining of limestone mines plays a crucial role in societal and economic ***,mining activities have led to destructive variations in grassland ecology and soil,causing numerous environmental problems,and effective artificial restoration measures have been used to restore grasslands in the Shimenhe mining areas to different *** this study,we investigated,examined and analyzed plant community structure and its correlation with soil properties across varying degrees of alpine grassland restoration in Qilian Mountains Shimenhe restoration mines using the sample method,and studied the changes in species diversity using five diversity indexes(Simpson index,Shannon index,Margalef index,Dominance index and Evenness index).This study showed that the plant community characteristics with high recovered degree(HRD)> middle recovered degree(MRD)> low recovered degree(LRD)> very low recovered degree(VLRD),11 plant genera comprising 11 species across 10 families were *** families with robust ecological adaptability included Leguminosae,Rosaceae,Gramineae,Asteraceae,and *** highest Simpson,Shannon,Margalef and Evenness index of HRD grassland community species were 0.82,1.96,1.66 and 0.89,*** highest Dominance index of VLRD grassland community species was 0.34,which required several restoration methods such as spraying and *** pH and EC tended to decrease with increasing restoration,SOC,SMC,TP,AP,NH4-N,TN,AN and NO3-N tended to increase and the content of soil environmental factors contributed to vegetation growth across various restoration levels the mine *** conclusion,our study indicated that the community structure gradually diversified and soil properties changed positively with the increase of restoration degrees in the Qilian Mountains Shimenhe mine,and the best results of HRD restoration were *** study provides the theoretical basis for the restoration and conservation of grassland

关键词： Alpine mining area grassland Grassland ecosystem Mine restoration Plant characteristics Soil properties Qilian mountains

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

sEMG-Based Lower Limb Motion Prediction Using CNN-LSTM with Improved PCA Optimization Algorithm

引用

Journal of Bionic Engineering 2023年第2期20卷 612-627页

作者： meng zhu Xiaorong Guan Zhong Li Long He Zheng Wang Keshu Cai School of Mechanical Engineering Nanjing University of Science and TechnologyNo.200XiaolingweiNanjing CityJiangsu ProvinceChina Department of Rehabilitation Medicine The First Affiliated Hospital of Nanjing Medical University300 Guangzhou RoadNanjing CityJiangsu ProvinceChina

In recent years,sEMG(surface electromyography)signals have been increasingly used to operate wearable *** development of mechanical lower limbs or exoskeletons controlled by the nervous system requires greater accuracy in recognizing lower limb *** is less research on devices to assist the human body in uphill ***,developing controllers that can accurately predict and control human upward movements in real-time requires the employment of appropriate signal pre-processing methods and prediction *** this purpose,this paper investigates the effects of various sEMG pre-processing methods and algorithms on the prediction *** investigation involved ten subjects(five males and five females)with normal knee *** relevant data of the subjects were collected on a constructed *** obtain feature values that reflect the gait characteristics,an improved PCA algorithm based on the kernel method is proposed for dimensionality reduction to remove redundant ***,a new model(CNN+LSTM)was proposed to predict the knee joint *** approaches were utilized to validate the superiority of the improved PCA method and CNN-LSTM *** feasibility of the method was verified by analyzing the gait prediction results of different ***,the prediction time of the method was 25 ms,and the prediction error was 1.34±0.25 *** comparing with traditional machine learning methods such as BP(backpropagation)neural network,RF(random forest),and SVR(support vector machine),the improved PCA algorithm processed data performed the best in terms of convergence time and prediction accuracy in CNN-LSTM *** experimental results demonstrate that the proposed method(improved PCA+CNN-LSTM)effectively recognizes lower limb activity from sEMG *** the same data input,the EMG signal processed using the improved PCA method performed better in terms of prediction *** is the first step toward myoelectri

关键词： CNN LSTM Exoskeleton sEMG Knee trajectory PCA Bionic robot

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Degradation kinetic study of lysine in lysine hydrochloride solutions for injection by determining its main degradation product

引用

Asian Journal of Pharmaceutical Sciences 2015年第1期10卷 57-63页

作者： mengying Tao meng zhu Chunnuan Wu Zhonggui He Shenyang Pharmaceutical University No.103Wenhua RoadShenyang 110016China

A limited number of researches have been reported to apply the Arrhenius equation to study the relationship between drugs and its degradation products so *** the present work,the thermal degradation kinetics of lysine hydrochloride solutions for injection,the special solvent for ademetionine 1,4-butanedisulfonate(SAM)for injection,was investigated at selected temperatures and pH *** main degradation product of lysine was separated,purified,and confirmed as lysine lactam.A reversed-phase high performance liquid chromatographic(RP-HPLC)method without derivation was developed for the simultaneous determination of lysine and lysine *** results confirmed that both the lysine degradation and lysine lactam generation followed zero-order reaction *** degradation and generation rate constants increased with increasing temperatures and decreasing pH *** temperature-dependent degradation and generation reaction could be sufficiently modeled on the Arrhenius equation with the activation energy of 80.14 and 83.22 kJ/mol,***,a linear relationship existed between the amount of lysine degradation and lysine lactam generation since the approximate activation *** there could be other side effects,we established an upper limit of lysine lactam(500 mg/ml),as the acceptable criteria for stability to estimate the shelf life together with lysine,which made the prediction more accurate and *** data demonstrated that the lysine hydrochloride solutions for injection could be stable for two years stored at room temperature.

关键词： Lysine hydrochloride Lysine lactam Degradation kinetics Shelf life

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：