检索结果-内蒙古大学图书馆

optimized parameters and Forecast Analysis of High-position Hole for Goaf Gas Drainage

Procedia Engineering 2012年 45卷 305-310页

作者： Houcheng Ding Zhongan Jiang Qingming Zhu School of construction Engineering Anhui University of Technology Ma’anshan 243032 China Civil and Environmental Engineering School University of Science and Technology Beijing Beijing 100083 China

In order to obtain the ideal parameters and drainage quantity of high-position hole for gas drainage, the flow equation of high-position hole for goaf gas drainage is established, and No.1111 Fully Mechanized Coal Mining working face of Zhangji mine was taken as the field for simulating methane flow by Matlab software to gain high-position ideal drainage parameters. It showed that borehole interval should be 0.5 m, the drainage pressure should be in the range from 0.015 MPa to 0.025 MPa, the borehole diameter should be 108 mm. At the same time, in order to control working face air quantity and gas drainage quantity of goaf, the relation of methane quantity drained by wind and methane drainage quantity of high-position hole was analysed, and forecast model of high-position hole drainage quantity was established. The drainage parameters and forecast model of high-position hole can be introduced to the other similar mines of coal seam storage, which is beneficial to safety production for high methane mines.

关键词： high-position hole flow equation numerical simulation optimized parameters forecast model

来源：评论

学校读者我要写书评

暂无评论

A conformable fractional-order grey Bernoulli model with optimized parameters and its application in forecasting Chongqing's energy consumption

引用

EXPERT SYSTEMS WITH APPLICATIONS 2024年第PartB期255卷

作者： Wu, Wenqing Ma, Xin Zeng, Bo Zhang, Yuanyuan Civil Aviat Flight Univ China Sch Sci Guanghan 618307 Peoples R China Southwest Univ Sci & Technol Sch Math & Phys Mianyang 621010 Peoples R China Chongqing Technol & Business Univ Coll Business Planning Chongqing 400067 Peoples R China

Chongqing is the only province and city with net energy input in southwest China, and its energy security has been in a tight balance for a long time. To propose scientific and reasonable energy policies for Chongqing under the "dual carbon"goal, this paper studies Chongqing's total energy consumption, coal consumption, natural gas consumption, and oil consumption by a conformable fractional -order grey Bernoulli model with optimized parameters. The new model is studied with its linearized form, the conformable fractional -order accumulation operation, the grey modelling technique, the least squares method, and the whale optimization algorithm. According to historical data, several forecasting models are built. From calculation results, the mean absolute validation percentage errors of the new model are smaller than those of other models in the total energy consumption, coal consumption and natural gas consumption, with values of 1.31%, 1.43%, and 2.41%, respectively. In the oil consumption, the MAPE valid is 3.85%, which is the second smallest among these models. The results illustrate that the new model can provide competitive results. Further, the values in the next five years are calculated.

关键词： Grey Bernoulli model optimized parameters Linearized form Whale optimization algorithm Energy consumption of Chongqing

来源：评论

学校读者我要写书评

暂无评论

Optimizing MFCC parameters for the automatic detection of respiratory diseases

引用

APPLIED ACOUSTICS 2025年 228卷

作者： Yan, Yuyang Simons, Sami O. van Bemmel, Loes Reinders, Lauren G. Franssen, Frits M. E. Urovi, Visara Maastricht Univ Inst Data Sci Paul Henri Spaaklaan 1 NL-6229 EN Maastricht Netherlands Maastricht Univ NUTRIM Res Inst Nutr & Translat Res Metab Fac Hlth Med & Life Sci Dept Resp Med P Debyelaan 25 NL-6229 HX Maastricht Netherlands Maastricht Univ Med Ctr Dept Resp Med P Debyelaan 25 NL-6229 HX Maastricht Netherlands Ciro Dept Res & Dev Hornerheide 1 NL-6085 NM Horn Netherlands

Voice signals originating from the respiratory tract are utilized as valuable acoustic biomarkers for the diagnosis and assessment of respiratory diseases. Among the employed acoustic features, Mel Frequency Cepstral Coefficients (MFCC) are widely used for automatic analysis, with MFCC extraction commonly relying on default parameters. However, no comprehensive study has systematically investigated the impact of MFCC extraction parameters on respiratory disease diagnosis. In this study, we address this gap by examining the effects of key parameters, namely the number of coefficients, frame length, and hop length between frames, on respiratory condition examination. Our investigation uses four datasets: the Cambridge COVID-19 Sound database, the Coswara dataset, the Saarbr & uuml;cken Voice Disorders (SVD) database, and a TACTICAS dataset. The Support Vector Machine (SVM) is employed as the classifier, given its widespread adoption and efficacy. Our findings indicate that the accuracy of MFCC decreases as hop length increases, and the optimal number of coefficients is observed to be approximately 30. The performance of MFCC varies with frame length across the datasets: for the COVID19 datasets (Cambridge COVID-19 Sound database and Coswara dataset), performance declines with longer frame lengths, while for the SVD dataset, performance improves with increasing frame length (from 50 ms to 500 ms). Furthermore, we investigate the optimized combination of these parameters and observe substantial enhancements in accuracy. Compared to the worst combination, the SVM model achieves an accuracy of 81.1%, 80.6%, and 71.7%, with improvements of 19.6%, 16.10%, and 14.90% for the Cambridge COVID-19 Sound database, the Coswara dataset, and the SVD dataset respectively. To validate the generalization of these findings, we employ the Long Short-Term Memory (LSTM) model as a validation model. Remarkably, the LSTM model also demonstrates improved accuracy of 14.12%, 10.10%, and 6.68%

关键词： Acoustic biomarkers MFCC extraction parameters Respiratory disease optimized parameters

来源：评论

学校读者我要写书评

暂无评论

Investigation of functionally graded triply periodic minimal surfaces with graphene-reinforced AlSi10Mg powder: Design, fabrication and impact resistance

引用

MATERIALS & DESIGN 2025年 250卷

作者： Hu, Mengyuan Wu, Xueqing Xu, Yangyang Huang, Xin Lu, Da Pei, Baoqing Beihang Univ Beijing Adv Innovat Ctr Biomed Engn Sch Biol Sci & Med Engn Beijing Key Lab Design & Evaluat Technol Adv Impla Beijing 100083 Peoples R China

The triply periodic minimal surfaces (TPMS) are regarded as potential impact resistance structures due to the lightweight and outstanding energy absorption. Graphene is an ideal reinforcing phase material for the high strength and excellent ductility. However, the research on the effect of graphene, as a reinforcing phase, for the impact resistance of gradient TPMS is relatively limited. In this work, different gradients Diamond and Gyroid structures were designed to employ finite element analysis. The structures were prepared by SLM with optimized parameters and were performed with quasi-static compression and dynamic impact experiments. The impact performance was quantified by three critical indicators. The positive gradient porosity Gyroid structure (PGG) and positive gradient porosity Diamond structure (PGD) possessed superior energy absorption capacity. The samples prepared with optimized parameters of the laser powder of 370 W and scanning speed of 1500 mm/s exhibited significant characteristics with relative density of 99.6 %. The PGG and PGD lattice structures possessed superior impact resistance under both loading conditions, which the mechanical properties were improved by the load transfer, grain refinement, thermal expansion mismatch and Orowan strengthening mechanism of graphene. This study has guiding significance for the design of lightweight porous structures and enhancement of impact resistance.

关键词： Triply periodic minimal surfaces optimized parameters Graphene/AlSi10Mg powder Impact resistance Finite element analysis

来源：评论

学校读者我要写书评

暂无评论

The optimal geometry parameters and impact of parasitic capacitance and resistance of sub-14nm SOI multi-fin FinFETs

引用

JOURNAL OF INTELLIGENT & FUZZY SYSTEMS 2017年第5期33卷 2699-2709页

作者： Han, Ke Qiao, Guohui Deng, Zhongliang Li, Qingbo Xing, Huashuai Beijing Univ Posts & Telecommun Coll Elect Engn Beijing Peoples R China

Nowadays FinFETs integrated into complex applications can fulfill the demand of new technology and make chips that can compute faster. Simultaneously various novel FinFETs structures come up constantly. In this brief, the impact of significant geometry parameters variations to device performance has been studied, such as fin height (Hfin), fin width (Wfin), fin spacing (Sfin), aspect ratio (Wfin/Hfin), and so on. In the result, we are able to determine the optimum device parameters for Multi-fin FinFETs. Meanwhile we analyze the parasitic gate capacitance and resistance of the multi-fin FinFETs using a conformal mapping method. To minimize the number of model fitting parameters, nondimensionalization technique is used. An effective lumped resistance model derived from distributed RC network is in use. Also, an analytical parasitic gate capacitance model is proposed, combined with parasitic capacitive couplings between source/drain fins and gates. Those analytical model can be applied for accurate circuit simulations of multi-fin FinFETs devices. The results presented in this paper can be of great help to device designers in designing 3-D devices as per their requirement.

关键词： optimized parameters device performance multi-fin FinFETs parasitic capacitance parasitic resistance conformal mapping

来源：评论

学校读者我要写书评

暂无评论

Optimizing the parameters for force, temperature, and metal removal rate: a multi-feature fusion model for titanium alloy milling

引用

TRANSACTIONS OF THE CANADIAN SOCIETY FOR MECHANICAL ENGINEERING 2022年第1期46卷 140-152页

作者： Li, Songyuan Li, Shuncai Li, Yuqing Popov, Eugene Jiangsu Normal Univ Sch Mech & Elect Engn Xuzhou 221116 Jiangsu Peoples R China Jiangsu Normal Univ JSNU SPBPU Inst Engn Xuzhou 221116 Jiangsu Peoples R China Petersburg Polytech Univ Higher Sch Appl Phys & Space Technol St Petersburg 1952151 Russia

In the processing of titanium alloy, the milling parameters determine the process temperature and force. Increasing the milling temperature and force can affect the quality of the titanium alloy produced. In this study, we developed a multi-feature fusion model for high-quality titanium alloy workpieces. In the milling experiments with different milling parameters, an infrared thermal imager and a three-dimensional dynamometer were used to collect the time-domain signals for temperature near the tip of the milling cutter and the milling force. Based on the experimental data, a multi-feature fusion model was established with the milling temperature, milling force, and metal removal rate as the targeted variables, and the milling parameters as the optimized parameters. Based on the particle swarm optimization algorithm, the optimal milling parameters within the test parameters were resolved using the multi-feature fusion model. The results show that: within the milling parameter range of the experimental design, the optimal solutions for the milling parameters are: milling speed of 22.14 m/min;feed speed of 8.25 mm/min;milling depth of 1.36 mm. The multi-feature fusion model resulted in lower milling temperature and force, and provides theoretical guidance for scientifically designing the parameters for the milling process.

关键词： milling temperature milling force metal removal rate multi-feature fusion model optimized parameters PSO

来源：评论

学校读者我要写书评

暂无评论

Selection procedure for hydraulic impact system parameters

引用

JOURNAL OF MINING SCIENCE 2014年第1期50卷 87-93页

作者： Gorodilov, L. V. Vagin, D. V. Pashina, O. A. Russian Acad Sci Siberian Branch Chinakal Inst Min Novosibirsk 630091 Russia

The developed procedure to select parameters of positive-displacement hydropercussion systems has two stages. The first stage is the picking of the key parameters;the second stage is the engineering design of the system, adjustment of the selected parameters using the multivariate optimization procedure and the improvement of the system performance.

关键词： Percussion system limit cycle optimized parameters selection criteria

来源：评论

学校读者我要写书评

暂无评论

Optimization of experimental design parameters for high-throughput chromatin immunoprecipitation studies

引用

NUCLEIC ACIDS RESEARCH 2008年第21期36卷 e144-e144页

作者： Ponzielli, Romina Boutros, Paul C. Katz, Sigal Stojanova, Angelina Hanley, Adam P. Khosravi, Fereshteh Bros, Christina Jurisica, Igor Penn, Linda Z. Univ Toronto Div Canc Genom & Proteom Toronto ON M5G 2M9 Canada Univ Toronto Univ Hlth Network Ontario Canc Inst Div Signaling Biol Toronto ON M5G 2M9 Canada Univ Toronto Dept Med Biophys Toronto ON M5G 2M9 Canada Univ Toronto Dept Comp Sci Toronto ON M5S 1A8 Canada

High-throughput, microarray-based chromatin immunoprecipitation (ChIP-chip) technology allows in vivo elucidation of transcriptional networks. However this complex is not yet readily accessible, in part because its many parameters have not been systematically evaluated and optimized. We address this gap by systematically assessing experimental-design parameters including antibody purity, dye-bias, array-batch, inter-day hybridization bias, amplification method and choice of hybridization control. The combined performance of these optimized parameters shows a 90 validation rate in ChIP-chip analysis of Myc genomic binding in HL60 cells using two different microarray platforms. Increased sensitivity and decreased noise in ChIP-chip assays will enable wider use of this methodology to accurately and affordably elucidate transcriptional networks.

关键词： .experimental design assessing platforms purity chromatin immunoprecipitation inter-day hybridization control optimized parameters genomic binding

来源：评论

学校读者我要写书评

暂无评论

Establish removal function and optimization of parameters based on steel polishing with an elastic polishing wheel device

引用

JOURNAL OF COMPUTATIONAL METHODS IN SCIENCES AND ENGINEERING 2019年第1期19卷 109-120页

作者： Wu, Xiaojun Tong, Xin Xian Univ Architecture & Technol Sch Mech & Elect Engn Xian Shaanxi Peoples R China

The service surface of SKD11 steel needs to meet mirror roughness. Traditional grinding and polishing method is time-consuming and the quality of polished surface is difficult to guarantee due to the high hardness of SKD11 after quenching. Based on the elastic abrasive, a novel type of elastic polishing wheel device, which is designed by us, is illustrated, and optimizing the combined polishing parameters in this paper is introduced. The Preston equation and the Hertz contact theory were used to establish the material removal model for polishing work piece surface with a novel elastic polishing wheel device. The removal model is close to Gaussian distribution through matlab simulation. Then grinding and polishing experiments on end face of SKD11 steel using elastic abrasive are carried out. A multi-index optimization was realized by the Taguchi method and Grey Relation Analysis (GRA). The results showed that setting cut depth exerts the most important influencing factors on material removal and abrasive wear. On the other hand, the optimized parameters combination of grinding and polishing is 80#, 1500 r/min grinding speed, 0.3 mm setting cut depth and 2 mm/min feed rate.

关键词： Eastic polishing wheel device gaussian distribution optimized parameters

来源：评论

学校读者我要写书评

暂无评论

The layout parameters of well groups and effect on land subsidence for salt mine in Zhangshu tourist area

The layout parameters of well groups and effect on land subs...

引用

1st International Symposium on Mine Safety Science and Engineering (ISMSSE)

作者： Yao Yuanfeng Yang Chunhe Li Yinping Ji Wendong Chinese Acad Sci State Key Lab Geomech & Geotech Engn Inst Rock & Soil Mech Wuhan 430071 Hubei Peoples R China

ISBN: (纸本)9781627485821

The solution-mined caverns have high pressure which is in proportion to the depth and specific density of brine. The cavern pressure will be approximately 12MPa at the point of 1000m below ground level. This would provide the best protection for the cavern roof and the pillar zone. Additionally, with the salt rock dissolved, the insluble mine collapsed and deposited at the bottom of cavern as loosed state around the piller zone which is also helpful to the stability of the piller. Obviously, there are essential differences between the solid-mined and the solution-mined caverns, where the simple experience in analysising the subsidence for the solid-mined caverns is poorly suited for the salt caverns. This paper focuses on the conflicts between the use of salt mine and the safety of building in the tourist area. The layout parameters of the well-group are optimized with a conbination of laboratory experiment and numerical simulation, which ensure the sagety of building and the reasonable utilization of salt. The study is extremely economical in terms of land area in beded salt mine in China. (C) 2011 Published by Elsevier Ltd. Selection and/or peer-review under responsibility of China Academy of Safety Science and Technology, China University of Mining and Technology(Beijing), McGill University and University of Wollongong.

关键词： salt mechanical test convection of well-group optimized parameters subsidence numerical simulation

来源：评论

学校读者我要写书评

暂无评论

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

请选择保存的检索档案：

请选择收藏分类：

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

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

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：