检索结果-南通市图书馆

Journal of Environmental Science and Engineering(B) 2019年第3期8卷 118-128页

作者： Waterman Sulistyana Bargawa hadi oetomo Yeremia Permana Jurianta Sembiring Mining Engineering Department University of Pembangunan Nasional Veteran YogyakartaYogyakarta 55283Indonesia Faculty of Economy University of Pembangunan Nasional Veteran YogyakartaYogyakarta 55283Indonesia

The level of availability and scarcity of resources gives an indication of how to manage scarce *** mining practice supports sustainability and minimizes environmental *** alternative to support the development of potential mineral resources is the study of mineral resource *** research objectives are:(a)to evaluate the potential of mineral resources and reserves,(b)to evaluate the production data of mineral commodities,(c)to calculate mineral reserve *** methodology includes an inventory of data in the Department of Energy and Mineral *** of mineral resource balance adjusted to the applicable *** study was conducted in the Central Java Province of *** on the evaluation results there were 26 mineral commodities,but there were only 12 commodities developed during *** resources are andesite,limestone,basalt,fill-dirt,sandstone,trass,feldspar,quartz-sand,marble,diorite stone,talk and *** mineral reserve supports the construction of highways,airports and other infrastructure projects in Central Java Province of Indonesia.

关键词： Mineral resources sustainability environment reserves balance contribution

Post-mining Water Management Using Macrophytes and Substrate Media

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

Journal of Environmental Science and Engineering(B) 2020年第5期9卷 200-205页

作者： Indun Titisariwati hadi oetomo Muhammad Tri Aditya Waterman Sulistyana Bargawa Department of Mining Engineering University of Pembangunan Nasional Veteran YogyakartaYogyakarta 55283Indonesia Faculty of Economy University of Pembangunan Nasional Veteran YogyakartaYogyakarta 55283Indonesia

Feldspar mine may cause environmental ***-mining lake water pollute the environment because it has a low pH containing heavy metals such as aluminium(Al).The research objective was to analyze the effectiveness of water quality changes using Eichorniasp and Thypaangustifolia plants with organic substrates,and to analyze the results of water quality management based on wastewater quality *** results showed that the treatment using water from pit lake+material pit lake+clumps of Thypaangustifolia+organic substrate was declared effective in increasing pH and reducing TSS and dissolved metals at 15 days of treatment,indicated by a pH value of 6.7-7.04,a TSS value of 1,710 mg/l to 108 mg/l,and decreased grade Al from 233.0975 mg/l to 190.77 mg/*** quality standard for Al dissolved metal management has not reached the waste water quality standard,while the results of pH and TSS management are in accordance with the quality standards stipulated with the provisions concerning the wastewater quality standard.

关键词： Post-mining passive remediation water quality

A new empirical chart for rockburst analysis in tunnelling:Tunnel rockburst classification(TRC)

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

International Journal of Mining Science and Technology 2021年第4期31卷 603-610页

作者： hadi Farhadian Department of Mining Engineering Faculty of EngineeringUniversity of BirjandBirjandIran

Rockburst is defined as a phenomenon with immediate dynamic instability under excavation unloading conditions of deep or high geostress *** knowledge and lack of characterizing information prevent engineers and experts from achieving appropriate prediction results related to the rockburst *** this study,a data set including 220 rockburst instances was collected for rockburst classification via the geostatistical *** update of the 2D graph,the tunnel rockburst classification(TRC)chart,was introduced based on analysing three indicators,namely,elastic energy index(Wet),tangential stress in rock mass(σ_(0)),and uniaxial compressive strength(σ_(c)).Distribution and correlation of data were drawn on 2D plot,and the boundaries of rockburst were distinguished according to the achieved interpolate points by kriging ***,the validation phase was performed using an additional set of 28 case histories obtained from several projects around the *** results showed that the TRC chart with an average error percentage of 3.6%in the prediction of rockburst had a significant and effective implementation in comparison to the exiting heuristic *** the initial character of the prediction,the described chart may be a helpful tool in the first steps of design and construction.

关键词： Prediction Tunnel rockburst Classification Empirical approach TRC

Experimental and numerical study on crack propagation in pre-cracked beam specimens under three-point bending

在线全文

学校读者我要写书评

暂无评论

Journal of Central South University 2016年第2期23卷 430-439页

作者： hadi Haeri Department of Mining Engineering Bafgh BranchIslamic Azad University

A simultaneous experimental and numerical study on crack propagation in the pre-cracked beams specimens(concrete-like materials) is carried out using three-point bending flexural test. The crack propagation and coalescence paths of internal cracks in side beam specimens are experimentally studied by inserting double internal cracks. The effects of crack positions on the fracturing path in the bridge areas of the double cracked beam specimens are also studied. It has been observed that the breaking of concrete-like cracked beams specimens occurs mainly by the propagation of wing cracks emanating from the tips of the pre-existing cracks in the numerical and experimental analyses, respectively. The same specimens are numerically simulated by an indirect boundary element method(IBEM) known as displacement discontinuity method(DDM) using higher displacement discontinuity. These numerical results are compared with the existing experimental results. This comparison illustrates the higher accuracy of the results obtained by the indirect boundary element method by using only a small number of elements compared with the discrete element method(PFC2D code).

关键词： double internal cracks concrete-like specimens crack propagation

Advanced land observing satellite data to identify ground vegetation in a juniper forest,northeast Iran

在线全文

学校读者我要写书评

暂无评论

Journal of Forestry Research 2020年第2期31卷 531-539页

作者： hadi Fadaei Geography Group Amin Police-Science UniversityTehranIran

Juniperus excelsa ***,(Persian juniper),is found in northeast *** this study,the relationship between ground cover and vegetation indices have been investigated using remote sensing data for a Persian juniper *** data were analyzed based on the Advanced Visible and Near Infrared Radiometer type 2 and panchromatic data obtained by the Panchromatic Remote-sensing Instrument for Stereo Mapping sensors,both on board the advanced land observing satellite(ALOS).The ground cover was calculated using field survey data from 25 sub-sample plots and the vegetation indices were derived with 595 maximum filtering algorithm from ALOS data.R2 values were calculated for the normalized difference vegetation index(NDVI)and various soil-adjusted vegetation indices(SAVI)with soilbrightness-dependent correction factors equal to 1 and 0.5,a modified SAVI(MSAVI)and an optimized SAVI(OSAVI).R2 values for the NDVI,MSAVI,OSAVI,SAVI(1),and SAVI(0.5)were 0.566,0.545,0.619,0.603,and 0.607,*** ratio vegetation index for arid and semi-arid regions based on spectral wavelengths of ALOS data with an R2 value 0.633 was *** of the current study will be useful for forest inventories in arid and semi-arid regions in addition to assisting decisionmaking for natural resource managers.

关键词： Ground cover Juniperus excelsa subsp.polycarpos Vegetation indices Advanced land observing satellite(ALOS)

A Sliding Mode Controller Based on Robust Model Reference Adaptive Proportional-integral Control for Stand-alone Three-phase Inverter

在线全文

学校读者我要写书评

暂无评论

Journal of Modern Power Systems and Clean Energy 2021年第3期9卷 668-678页

作者： hadi Esmaeili Mehdi Asadi Arak University of Technology ArakIran

This paper proposes a sliding mode controller based on robust model reference adaptive proportional-integral(RMRA-PI)control for a stand-alone voltage source inverter(SA-VSI).The proposed controller has two control loops where the coefficients of PI controller are regulated by the adaptive sliding *** method is used to regulate the output voltage of the inverter under different load conditions and uncertainty,and adapts the output to the reference model to reduce the total harmonic distortion(THD).In this paper,the stability of the proposed controller is proven by using Lyapunov's theory and Barbalet’s *** proposed controller performs well in voltage regulation such as low THD under sudden load change and ***,the results of the proposed controller are compared with PI controller to show the effectiveness of the presented control system.

关键词： Robust model reference adaptive proportional-integral(RMRA-PI)control stand-alone inverter three-phase inverter voltage control Lyapunov's theory

Uncertainty propagation in dynamics of composite plates: A semi-analytical non-sampling-based approach

在线全文

学校读者我要写书评

暂无评论

Frontiers of Structural and Civil Engineering 2020年第6期14卷 1359-1371页

作者： Mahdi FAKOOR hadi PARVIZ Faculty of New Sciences and Technologies University o f TehranTehran 14395-1561Iran

In this study,the influences of spatially varying stochastic properties on free vibration analysis of composite plates were investigated via development of a new approach named the deterministic-stochastic Galerkin-based semi-analytical *** material properties including tensile modulus,shear modulus,and density of the plate were assumed to be spatially varying and *** fields with first-order Markov kernels were utilized to define the aforementioned material *** stochastic fields were decomposed via application of the K arhunen-Loeve theorem.A first-order shear deformation theory was assumed,following which the displacement field was defined using admissible trigonometric modes to derive the potential and kinetic *** stochastic equations of motion of the plate were obtained using the variational *** deterministic-stochastic Galerkin-based method was utilized to find the probability space of natural frequencies,and the corresponding mode shapes of the plate were determined using a polynomial chaos *** proposed method significantly reduced the size of the mathematical models of the structure,which is very useful for enhancing the computational efficiency of stochastic *** methodology was verifed using a stochastic finite element method and the available results in *** sensitivity of natural frequencies and corresponding mode shapes due to the uncertainty of material properties was investigated,and the results indicated that the higher-order modes are more sensitive to uncertainty propagation in spatially varying properties.

关键词： composite plate spatially varying stochastic properties Galerkin method polynomial chaos approach semi-analytical approach

An Influence Statistic For Linear Measurement Error Models

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

Acta Mathematicae Applicatae Sinica 2017年第3期33卷 619-632页

作者： hadi EMAMI Department of statistics University of ZanjanZanjanIran

Detection of multiple outliers or subset of influential points has been rarely considered in the linear measurement error models. In this paper a new influence statistic for one or a set of observations is generalized and characterized based on the corrected likelihood in the linear measurement error models. This influence statistic can be expressed in terms of the residuals and the leverages of linear measurement error regression. Unlike Cook＇s statistic, this new measure of influence has asymptotically normal distribution and is able to detect a subset of high leverage outliers which is not identified by Cook＇s statistic. As an illustrative example, simulation studies and a real data set are analysed.

关键词： cook's statistic corrected likelihood diagnostics leverages outlier

Data-driven estimation of joint roughness coefficient

在线全文

学校读者我要写书评

暂无评论

Journal of Rock Mechanics and Geotechnical Engineering 2021年第6期13卷 1428-1437页

作者： hadi Fathipour-Azar Faculty of Mining Engineering Petroleum and GeophysicsShahrood University of TechnologyShahroodIran

Joint roughness is one of the most important issues in the hydromechanical behavior of rock ***,the joint roughness coefficient(JRC)estimation is of paramount importance in geomechanics engineering *** show that the application of statistical parameters alone may not produce a sufficiently reliable estimation of the JRC ***,alternative data-driven methods are proposed to assess the JRC *** this study,Gaussian process(GP),K-star,random forest(RF),and extreme gradient boosting(XGBoost)models are employed,and their performance and accuracy are compared with those of benchmark regression formula(i.e.Z2,Rp,and SDi)for the JRC *** analyze the models’performance,112 rock joint profile datasets having eight common statistical parameters(R_(ave),R_(max),SD_(h),iave,SD_(i),Z_(2),R_(p),and SF)and one output variable(JRC)are utilized,of which 89 and 23 datasets are used for training and validation of models,*** interpretability of the developed XGBoost model is presented in terms of feature importance ranking,partial dependence plots(PDPs),feature interaction,and local interpretable model-agnostic explanations(LIME)*** of results show that machine learning models demonstrate higher accuracy and precision for estimating JRC values compared with the benchmark empirical equations,indicating the generalization ability of the data-driven models in better estimation accuracy.

关键词： Joint roughness coefficient(JRC) Statistical parameters Gaussian process(GP) K-star Random forest(RF) Extreme gradient boosting(XGBoost) Correlation Machine learning(ML) Sensitivity analysis

Study of shape isomer yields of ^(240)Am in the framework of a dynamical-statistical model

在线全文

学校读者我要写书评

暂无评论

Chinese Physics C 2010年第11期34卷 1714-1716页

作者： hadi Eslamizadeh Department of Physics Persian Gulf University

A dynamical statistical model is used to analyze the experimental shape isomer yields data in the reaction d＋240Pu at E=20–29 *** possibility of determining the nuclear dissipation is *** of the experimental data wi... 详细信息

关键词： fission fission barrier reduced dissipation coeffcient