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Dynamic energy system modeling using hybrid physics-based and machinelearning encoder–decoder models

Energy and AI 2022年第3期9卷 128-138页

作者： Derek machalek Jake Tuttle Klas Andersson kody m.powell Department of Chemical Engineering University of UtahSalt Lake CityUTUnited States of America Taber International LLCUnited States of America Department of Space Earthand EnvironmentUniversity of ChalmersGothenburgSweden Department of mechanical Engineering University of UtahSalt Lake CityUTUnited States of America

Three model configurations are presented for multi-step time series predictions of the heat absorbed by thewater and steam in a thermal power plant. The models predict over horizons of 2, 4, and 6 steps into thefuture, where each step is a 5-minute increment. The evaluated models are a pure machine learning model, anovel hybrid machine learning and physics-based model, and the hybrid model with an incomplete dataset. Thehybrid model deconstructs the machine learning into individual boiler heat absorption units: economizer, waterwall, superheater, and reheater. Each configuration uses a gated recurrent unit (GRU) or a GRU-based encoder–decoder as the deep learning architecture. mean squared error is used to evaluate the models compared totarget values. The encoder–decoder architecture is over 11% more accurate than the GRU only models. Thehybrid model with the incomplete dataset highlights the importance of the manipulated variables to the *** hybrid model, compared to the pure machine learning model, is over 10% more accurate on averageover 20 iterations of each model. Automatic differentiation is applied to the hybrid model to perform a localsensitivity analysis to identify the most impactful of the 72 manipulated variables on the heat absorbed in theboiler. The models and sensitivity analyses are used in a discussion about optimizing the thermal power plant.

关键词： Hybrid model Encoder-decoder Time series Automatic differentiation Thermal power plant

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Scenario Generation for Cooling,Heating,and Power Loads Using Generative moment matching Networks

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CSEE Journal of Power and Energy Systems 2022年第6期8卷 1730-1740页

作者： Wenlong Liao Yusen Wang Yuelong Wang kody powell Qi Liu Zhe Yang Department of Energy Technology Aalborg UniversityAalborg 9220Denmark School of Electrical Engineering and Computer Science KTH Royal Institute of TechnologyStockholmSE-10044Sweden State Grid Tianjin Chengxi Electric Power Supply Branch Tianjin 300100China Department of Chemical Engineering University of UtahUT 84112America Key Laboratory of Smart Grid of ministry of Education Tianjin UniversityTianjin 300072China

Scenario generations of cooling,heating,and power loads are of great significance for the economic operation and stability analysis of integrated energy *** this paper,a novel deep generative network is proposed to model cooling,heating,and power load curves based on generative moment matching networks(GmmNs)where an auto-encoder transforms highdimensional load curves into low-dimensional latent variables and the maximum mean discrepancy represents the similarity metrics between the generated samples and the real *** training the model,the new scenarios are generated by feeding Gaussian noises to the scenario generator of the *** the explicit density models,the proposed GmmN does not need to artificially assume the probability distribution of the load curves,which leads to stronger *** simulation results show that the GmmN not only fits the probability distribution of multiclass load curves very well,but also accurately captures the shape(e.g.,large peaks,fast ramps,and fluctuation),frequency-domain characteristics,and temporal-spatial correlations of cooling,heating,and power ***,the energy consumption of generated samples closely resembles that of real samples.

关键词： Deep learning generative moment matching networks integrated energy systems scenario generations

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Arabidopsis ADC1 functions as an Nδ-acetylornithine decarboxylase

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Journal of Integrative Plant Biology 2020年第5期62卷 601-613页

作者： Yann-Ru Lou Sheaza Ahmed Jian Yan Adewale m.Adio Hannah m.powell Paul F.morris Georg Jander Boyce Thompson Institute for Plant Research IthacaNY 14853USA Department of Biological Sciences Bowling Green State UniversityBowling GreenOH 43403USA Key Laboratory of Agro-Environment in the Tropics Ministry of Agriculture and Rural AffairsSouth China Agricultural UniversityGuangzhou 510642China Department of Biochemistry and molecular Biology Michigan State UniversityEast LansingMI 48824USA Bayer Crop Science 700 Chesterfield Parkway WestChesterfieldMO 63017USA

Polyamines are small aliphatic amines found in almost all organisms,ranging from bacteria to plants and *** most plants,putrescine,the metabolic precursor for longer polyamines,such as spermidine and spermine,is produced from arginine,with either agmatine or ornithine as *** we show that Arabidopsis thaliana(Arabidopsis)arginine de-carboxylase 1(ADC1),one of the two known arginine decarboxylases in Arabidopsis,not only synthesizes agmatine from arginine,but also converts *** to *** analyses indicate that duplication and neofunctionalization of ADC1 and NATA1,the enzymes that synthesize Nδ-acetylormithine in Arabidopsis,co-occur in a small number of related species in the *** ADC2,which is localized in the chloroplasts,ADC1 is in the endoplasmic reticulum together with NATA1,an indication that these two enzymes have access to the same substrate ***,these results are con-sistent with a model whereby NATA1 and ADC1 to-gether provide a pathway for the synthesis of N-acetylputrescine in Arabidopsis.

关键词： Arabidopsis Phylogenetic Together

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Coordinated AR and microRNA regulation in prostate cancer

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Asian Journal of Urology 2020年第3期7卷 233-250页

作者： Ieva Eringyte Joanna N.Zamarbide Losada Sue m.powell Charlotte L.Bevan Claire E.Fletcher Imperial Centre for Translational and Experimental medicine Department of Surgery and CancerImperial College LondonHammersmith HospitalLondonUnited Kingdom

The androgen receptor(AR)remains a key driver of prostate cancer(PCa)progression,even in the advanced castrate-resistant stage,where testicular androgens are *** is therefore of critical importance to understand the molecular mechanisms governing its activity and regulation during prostate ***(miRs)are small w22 nt noncoding RNAs that regulate target gene,often through association with 30 untranslated regions(30UTRs)of *** display dysregulation during cancer progression,can function as oncogenes or tumour suppressors,and are increasingly recognised as targets or regulators of hormonal ***,understanding factors which modulate miRs synthesis is *** is increasing evidence for complex and dynamic bi-directional cross-talk between the multi-step miR biogenesis cascade and the AR signalling axis in *** review summarises the wealth of mechanisms by which miRs are regulated by AR,and conversely,how miRs impact AR’s transcriptional activity,including that of AR splice *** addition,we assess the implications of the convergence of these pathways on the clinical employment of miRs as PCa biomarkers and therapeutic targets.

关键词： microRNA Androgen receptor Androgen Prostate cancer Hormone Non-coding RNA

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mechanical suppression of breast cancer cell invasion and paracrine signaling to osteoclasts requires nucleo-cytoskeletal connectivity

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Bone Research 2020年第4期8卷 393-405页

作者： Xin Yi Laura E.Wright Gabriel m.Pagnotti Gunes Uzer Katherine m.powell Joseph m.Wallace Uma Sankar Clinton T.Rubin Khalid mohammad Theresa A.Guise William R.Thompson Department of Physical Therapy School of Health and Rehabilitation SciencesIndiana UniversityIndianapolisIN 46202USA Department of medicine Division of EndocrinologySchool of MedicineIndiana UniversityIndianapolisIN 46202USA Department of mechanical and Biomedical Engineering Boise State UniversityBoiseID 83725USA Department of Biomedical Engineering Purdue School of Engineering and TechnologyPurdue UniversityIndianapolisIN 46202USA Department of Anatomy&Cell Biology Indiana UniversityIndianapolisIN 46202USA Department of Biomedical Engineering Stony Brook UniversityStony BrookNY 11794USA

Exercise benefits the musculoskeletal system and reduces the effects of *** effects of exercise are multifactorial,where metabolic changes and tissue adaptation influence *** signals,a principal component of exercise,are anabolic to the musculoskeletal system and restrict cancer *** examined the mechanisms through which cancer cells sense and respond to low-magnitude mechanical signals introduced in the form of ***-magnitude,high-frequency vibration was applied to human breast cancer cells in the form of low-intensity vibration(LIV).LIV decreased matrix invasion and impaired secretion of osteolytic factors PTHLH,IL-11,and ***,paracrine signals from mechanically stimulated cancer cells,reduced osteoclast differentiation and resorptive *** the nucleus by knockdown of SUN1 and SUN2 impaired LIV-mediated suppression of invasion and osteolytic factor *** increased cell stiffness;an effect dependent on the LINC *** data show that mechanical vibration reduces the metastatic potential of human breast cancer cells,where the nucleus serves as a mechanosensory apparatus to alter cell structure and intercellular signaling.

关键词： invasion impaired skeletal

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Sensitivity analysis of borehole thermal energy storage: examining key factors for system optimization

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Energy Storage and Saving 2024年第3期3卷 218-230页

作者： Piyush Kumar Kumawat Haiyan Zhou Kevin Kitz John mcLennan kody powell milind Deo Palash Panja Department of Chemical Engineering University of UtahSalt Lake CityUT 84112USA Energy&Geoscience Institute University of UtahSalt Lake CityUT 84108USA RESPEC Company LLC Rapid CitySD 57703USA Kitzworks LLC BoiseID 83717USA

Borehole thermal energy storage(BTES)systems have garnered significant attention owing to their efficacy in storing thermal energy for heating and cooling *** modeling is paramount for ensuring the precise design and operation of BTES *** study conducts a sensitivity analysis of BTES modeling by employing a comparative investigation of five distinct parameters on a wedge-shaped model,with implications extendable to a cylindrical *** parameters examined included two design factors(well spacing and grout thermal conductivity),two operational variables(charging and discharging rates),and one geological attribute(soil thermal conductivity).Finite element simulations were carried out for the sensitivity analysis to evaluate the round-trip efficiency,both on a per-cycle basis and cumulatively over three years of operation,serving as performance *** results showed varying degrees of sensitivity across different models to changes in these *** particular,the round-trip efficiency exhibited a greater sensitivity to changes in spacing and volumetric flow ***,this study underscores the importance of considering the impact of the soil and grout-material thermal conductivities on the BTES-system performance over *** optimized scenario is modelled and compared with the base case,over a comparative assessment based on a 10-year *** analysis revealed that,at the end of the 10-year period,the optimized BTES model achieved a cycle efficiency of 83.4%.This sensitivity analysis provides valuable insights into the merits and constraints of diverse BTES modeling methodologies,aiding in the selection of appropriate modeling tools for BTES system design and operation.

关键词： Borehole thermal energy storage(BTES) Outlet temperature Round-trip efficiency Heating and cooling modes Well spacing Grout thermal conductivity Charging and discharging rates Soil thermal conductivity

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Effect of salinity and acidity on bioleaching activity of mesophilic and extremely thermophilic bacteria

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中国有色金属学会会刊：英文版 2008年第3期18卷 714-721页

作者： H.DEVECI m.A.JORDAN N.powell I.ALP Department of mining Engineering Karadeniz Technical UniversityTrabzon 61080Turkey Camborne School of mines UECTremough CampusPenrynCornwallTR109EZUK

The effects of bacterial strain, salinity and pH on the bioleaching of a complex ore using mesophilic and extremely thermophilic bacteria were investigated and the statistical analysis of the results was performed using ERGUN’s test. The extreme thermophiles were shown to display superior kinetics of dissolution of zinc compared with the mesophiles as confirmed by the statistical analysis. Bioleaching performance of the extreme thermophiles is found to improve in response to the increase in acidity (pH from 2.0 to 1.0) whilst the activity of the mesophiles is adversely affected by decreasing pH. Statistical analysis of the bioleaching data indicates that the effect of pH is insignificant in the range of pH 1.0-1.2 for the extreme thermophiles and pH 1.4-2.0 for the mesophiles. Salinity is shown to have a suppressing effect on the mesophiles. However, the extreme thermophiles appear to be halophilic in character as they could operate efficiently under saline conditions (1%-4%Cl- (w/v)).

关键词：细菌生物浸取盐度 pH 硫化物

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世界武器贸易预测

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航空兵器 1996年第2期3卷 46-49页

作者： Stewart m.powell 董春风 ○一四中心

承受巨大压力的美国国防装备承包商,由于努力适应冷战结束后骚动的世界武器销售新形势,预计在未来的十年中,仍将会在日益减少的世界武器贸易中占据较大的市场份额。这是五角大楼在新近的一项名为“世界常现武器贸易(1994～2000)

关键词：武器贸易美国公司五角大楼武器供应国武器销售武器系统国防装备无人驾驶飞行器 90年代战斗机

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利用先存劈理确定伸展断层几何特征

地震地质译丛

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地震地质译丛 1989年第6期 52-55页

作者： Ceri m.powell 何玉林

引言冰川国家公园位于蒙大拿北西的落基山前缘内(图1)以前的工作把注意力放在区内大型挤压和伸展构造上,并提出了这两种构造间可能的存在互相影响。本区主要的压性构造为拉腊米刘易斯逆断层(图1),断层走向NW-SE,将落基山前缘分成NE和SW... 详细信息

引言冰川国家公园位于蒙大拿北西的落基山前缘内(图1)以前的工作把注意力放在区内大型挤压和伸展构造上,并提出了这两种构造间可能的存在互相影响。本区主要的压性构造为拉腊米刘易斯逆断层(图1),断层走向NW-SE,将落基山前缘分成NE和SW两部分,其倾角15°,倾向SW,逆断层上盘的前寒武带超群被若干条平行于刘易斯断层走向的伸展断层所切割(图1)。这组伸展断层系最西边的特征表现为从蒙大拿北至不列颠哥伦比亚扩

关键词：劈理层理透入性小型构造沉积构造冲断层伸展断层地质断层断层上盘断裂带断层带落基山冰川国家公园几何特征挤压褶皱

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PERSONS WITH DISABILITIES AND THEIR SEXUAL, REPRODUCTIVE, AND PARENTING RIGHTS： AN INTERNATIONAL AND COmPARATIVE ANALYSIS

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Frontiers of Law in China-Selected Publications from Chinese Universities 2016年第1期11卷 53-85页

作者： Robyn m. powell michael Ashley Stein Lurie Institute for Disability Policy Fellow Disability Law Attorney Ph.D student at Heller School for Social Policy and Management Brandeis University Waltham US. Executive Director Harvard Law School Project on Disability Extraordinary Professor University of Pretoria Faculty of Law Centre for Human Rights Visiting Professor at Harvard Law School Cambridge US.

Abstract Despite important gains in human rights, persons with disabilities -- and in particular women and girls with disabilities -- continue to experience significant inequalities in the areas of sexual, reproductive, and parenting rights. Persons with disabilities are sterilized at alarming rates; have decreased access to reproductive health care services and information; and experience denial of parenthood. Precipitating these inequities are substantial and instantiated stereotypes of persons with disabilities as either asexual or unable to engage in sexual or reproductive activities, and as incapable of performing parental duties. The article begins with an overview of sexual, reproductive, and parenting rights regarding persons with disabilities. Because most formal adjudications of these related rights have centered on the issue of sterilization, the article analyzes commonly presented rationales used to justify these procedures over time and across jurisdictions. Next, the article examines the Convention on the Rights of Persons with Disabilities and the attendant obligations of States Parties regarding rights to personal integrity, access to reproductive health care services and information, parenting, and the exercise of legal capacity. Finally, the article highlights fundamental and complex issues requiring future research and consideration.

关键词： disability Convention on the Rights of Persons with Disabilities human rights,parenting sexual and reproductive rights

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