Готові списки джерел за темами / PTM MODEL

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Автор: Grafiati
Опубліковано: 11 вересня 2023

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Статті в журналах з теми "PTM MODEL"

1

Cao, Yu (Kevin). "What is Predictive Technology Model (PTM)?" ACM SIGDA Newsletter 39, no. 3 (March 2009): 1. http://dx.doi.org/10.1145/1862891.1862892.

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2

Li, Pengfei, Min Zhang, Peijie Lin, Jian Wan, and Ming Jiang. "Visual-Text Reference Pretraining Model for Image Captioning." Computational Intelligence and Neuroscience 2022 (January 21, 2022): 1–10. http://dx.doi.org/10.1155/2022/9400999.

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People can accurately describe an image by constantly referring to the visual information and key text information of the image. Inspired by this idea, we propose the VTR-PTM (Visual-Text Reference Pretraining Model) for image captioning. First, based on the pretraining model (BERT/UNIML), we design the dual-stream input mode of image reference and text reference and use two different mask modes (bidirectional and sequence to sequence) to realize the VTR-PTM suitable for generating tasks. Second, the target dataset is used to fine tune the VTR-PTM. To the best of our knowledge, VTR-PTM is the first reported pretraining model to use visual-text references in the learning process. To evaluate the model, we conduct several experiments on the benchmark datasets of image captioning, including MS COCO and Visual Genome, and achieve significant improvements on most metrics. The code is available at https://github.com/lpfworld/VTR-PTM.
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3

Park, Inhwan, Jaehyun Shin, Hoje Seong, and Dong Sop Rhee. "Comparisons of Two Types of Particle Tracking Models Including the Effects of Vertical Velocity Shear." Water 12, no. 12 (December 16, 2020): 3535. http://dx.doi.org/10.3390/w12123535.

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In this study, two types of particle tracking models were presented to investigate the applicability in the two-dimensional solute mixing simulations. The conventional particle tracking model, denoted as PTM, was developed based on Fick’s law, which adopted the dispersion coefficient to calculate the random displacements. The other model is the particle dispersion model (PDM), which computes the shear dispersion process by dividing into two computation procedures as the shear translation and the vertical mixing. The PTM and the PDM included the effects of vertical profiles of velocity in the computation of dispersion coefficients and the shear translation step, respectively. The main difference between the two models is whether the shear dispersion process is reproduced using Fick’s law or the direct computation method. These differences were clearly revealed by comparing with the analytic solution of the advection-dispersion equation. The concentration curve resulting from the PTM shows the Gaussian curves, which were well-fitted with the analytic solution in both initial and Taylor periods. Meanwhile, the PDM presented skewed curves in the initial period and gradually turned to the symmetric shape in the Taylor period. The inherent differences of the two particle tracking models were scrutinized against the two-dimensional tracer test results, which show the non-Fickian mixing properties. The comparisons of concentration–time curves reveal that the PDM reproduced a more accurate shape of the curves than the results by the PTM by demonstrating skewed concentration curves.
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NOERLIANI, DONY. "EVALUASI PASCA PELATIHAN KADER POSBINDU PTM ANGKATAN I DI LATKESMAS MURNAJATI TAHUN 2020 DENGAN PENDEKATAN MODEL KIRKPATRIC." COMMUNITY : Jurnal Pengabdian Kepada Masyarakat 1, no. 1 (September 14, 2021): 42–56. http://dx.doi.org/10.51878/community.v1i1.508.

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Penyakit Tidak Menular (PTM) dapat dicegah dengan mengendalikan factor resikonya. Upaya untuk menunjang program pemerintah dalam pengendalian factor resiko PTM serta terlaksananya pencegahan dan pengendalian factor resiko PTM berbasis peran serta masyarakat secara terpadu, rutin dan periodic maka diperlukan strategi khusus yaitu dengan pendidikan dan pelatihan kader Posbindu PTM. Tujuan dari penelitian ini adalah untuk mengevaluasi perubahan perilaku peserta Diklat Kader Posbindu PTM angkatan I dalam menerapkan hasil belajarnya pada pelaksanaan tugas sebagai kader Posbindu PTM di wilayah kerjanya. Penelitian ini merupakan penelitian deskriptif kualitatif untuk mengevaluasi perubahan perilaku peserta Diklat Kader Posbindu PTM I dengan metode evaluasi Kicrpatrick tahap tiga dengan sumber data peserta diklat, kader Posbindu PTM dan PJ PTM di tempat peserta Diklat Kader Posbindu PTM I. Pengambilan data secara daring dengan google drive dan observasi oleh enumerator. Pengambilan data dilakukan sepuluh (10) bulan setelah pelatihan. Hampir seluruh peserta diklat telah menindaklanjuti Rencana Tindak Lanjut yang telah dibuat yaitu pelaporan, sosialisasi, dan penyusunan rencana kerja. Sebagian besar peserta diklat telah melaksanakan upaya pencegahan dan pengendalian Faktor Resiko PTM secara preventif, promotif, deteksi dini dan monitoring serta pelaksanaan rujukan pada warga dengan resiko dan melaksanakan pencatatan dan pelaporan. Posbindu PTM merupakan wujud peran serta masyarakat dalam kegiatan deteksi dini, monitoring dan tindak lanjut dini factor resiko PTM secara mandiri dan berkesinambungan. Pelatihan diperlukan untuk pengembangan diri kader agar penyelenggaraan Posbindu menjadi lebih efekltif oleh karena itu diperlukan evaluasi pelatihan yang telah dilaksanakan untuk mendapatkan informasi tentang efektifitas dan tingkat ketercapaian dari suatu pendidikan dan pelatihan.
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5

Wang, Hang, and David Miller. "Improved Parsimonious Topic Modeling Based on the Bayesian Information Criterion." Entropy 22, no. 3 (March 12, 2020): 326. http://dx.doi.org/10.3390/e22030326.

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Анотація:
In a previous work, a parsimonious topic model (PTM) was proposed for text corpora. In that work, unlike LDA, the modeling determined a subset of salient words for each topic, with topic-specific probabilities, with the rest of the words in the dictionary explained by a universal shared model. Further, in LDA all topics are in principle present in every document. In contrast, PTM gives sparse topic representation, determining the (small) subset of relevant topics for each document. A customized Bayesian information criterion (BIC) was derived, balancing model complexity and goodness of fit, with the BIC minimized to jointly determine the entire model—the topic-specific words, document-specific topics, all model parameter values, and the total number of topics—in a wholly unsupervised fashion. In the present work, several important modeling and algorithm (parameter learning) extensions of PTM are proposed. First, we modify the BIC objective function using a lossless coding scheme with low modeling cost for describing words that are non-salient for all topics—such words are essentially identified as wholly noisy/uninformative. This approach increases the PTM’s model sparsity, which also allows model selection of more topics and with lower BIC cost than the original PTM. Second, in the original PTM model learning strategy, word switches were updated sequentially, which is myopic and susceptible to finding poor locally optimal solutions. Here, instead, we jointly optimize all the switches that correspond to the same word (across topics). This approach jointly optimizes many more parameters at each step than the original PTM, which in principle should be less susceptible to finding poor local minima. Results on several document data sets show that our proposed method outperformed the original PTM model with respect to multiple performance measures, and gave a sparser topic model representation than the original PTM.
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6

Devnath, Bappy Chandra, and Satyendra N. Biswas. "Low Power Full Adder Design Using PTM Transistor Model." Carpathian Journal of Electronic and Computer Engineering 12, no. 2 (December 1, 2019): 15–20. http://dx.doi.org/10.2478/cjece-2019-0011.

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Abstract At present the processing power of the digital electronic chip is enormous and that has been possible because of the continuous improvement of the design methodology and fabrication technology. So, the data processing capability of the chip is increased significantly. Data processing in the electronic chip means the arithmetic operation on that data. For that reason, ALU is present in any processor. Full adder is one of the critical components of arithmetic unit. Improvement of the full adder is necessary for improving the computational performance of a chip. In order to design an efficient full adder, designer should choose an appropriate logic style. In this research, two new model of full-adder circuits are designed and analyzed using Pass Transistor logic in order to reduce power consumption and increase operational speed. The first proposed adder consists of 8 transistors and the second one consists of 10 transistors. LTSPICE is employed for simulating the proposed circuits using16nm low power high-k strained silicon transistor model. The overall performance of the proposed adder circuits and comparative results demonstrate the superiority of the proposed model.
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7

Su, Meng, Danfeng Cao, Zhe Wang, Yanwen Duan, and Yong Huang. "Fatty Acid Synthase Inhibitor Platensimycin Intervenes the Development of Nonalcoholic Fatty Liver Disease in a Mouse Model." Biomedicines 10, no. 1 (December 21, 2021): 5. http://dx.doi.org/10.3390/biomedicines10010005.

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Non-alcoholic fatty liver disease (NAFLD) is a chronic liver disease affecting about 25% of world population, while there are still no approved targeted therapies. Although platensimycin (PTM) was first discovered to be a broad-spectrum antibiotic, it was also effective against type II diabetes in animal models due to its ability to inhibit both bacterial and mammalian fatty acid synthases (FASN). Herein, we report the pharmacological effect and potential mode of action of PTM against NAFLD in a Western diet/CCI4-induced mouse model and a free fatty acids (FFAs)-induced HepG2 cell model. The proper dose of PTM and its liposome-based nano-formulations not only significantly attenuated the Western diet-induced weight gain and the levels of plasma total triglycerides and glucose, but reduced liver steatosis in mice according to histological analyses. Western blotting analysis showed a reduced protein level of FASN in the mouse liver, suggesting that PTM intervened in the development of NAFLD through FASN inhibition. PTM reduced both the protein and mRNA levels of FASN in FFAs-induced HepG2 cells, as well as the expression of several key proteins in lipogenesis, including sterol regulatory element binding protein-1, acetyl-CoA carboxylase, and stearoyl-CoA desaturase. The expression of lipid oxidation-related genes, including peroxisome proliferator activated receptor α and acyl-CoA oxidase 1, was significantly elevated. In conclusion, our study supports the reposition of PTM to intervene in NAFLD progression, since it could effectively inhibit de novo lipogenesis.
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8

Alkuhlani, Alhasan, Walaa Gad, Mohamed Roushdy, Michael Gr Voskoglou, and Abdel-badeeh M. Salem. "PTG-PLM: Predicting Post-Translational Glycosylation and Glycation Sites Using Protein Language Models and Deep Learning." Axioms 11, no. 9 (September 14, 2022): 469. http://dx.doi.org/10.3390/axioms11090469.

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Post-translational glycosylation and glycation are common types of protein post-translational modifications (PTMs) in which glycan binds to protein enzymatically or nonenzymatically, respectively. They are associated with various diseases such as coronavirus, Alzheimer’s, cancer, and diabetes diseases. Identifying glycosylation and glycation sites is significant to understanding their biological mechanisms. However, utilizing experimental laboratory tools to identify PTM sites is time-consuming and costly. In contrast, computational methods based on machine learning are becoming increasingly essential for PTM site prediction due to their higher performance and lower cost. In recent years, advances in Transformer-based Language Models based on deep learning have been transferred from Natural Language Processing (NLP) into the proteomics field by developing language models for protein sequence representation known as Protein Language Models (PLMs). In this work, we proposed a novel method, PTG-PLM, for improving the performance of PTM glycosylation and glycation site prediction. PTG-PLM is based on convolutional neural networks (CNNs) and embedding extracted from six recent PLMs including ProtBert-BFD, ProtBert, ProtAlbert, ProtXlnet, ESM-1b, and TAPE. The model is trained and evaluated on two public datasets for glycosylation and glycation site prediction. The results show that PTG-PLM based on ESM-1b and ProtBert-BFD has better performance than PTG-PLM based on the other PLMs. Comparison results with the existing tools and representative supervised learning methods show that PTG-PLM surpasses the other models for glycosylation and glycation site prediction. The outstanding performance results of PTG-PLM indicate that it can be used to predict the sites of the other types of PTMs.
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9

He, Tie-Ke, Hao Lian, Ze-Min Qin, Zhen-Yu Chen, and Bin Luo. "PTM: A Topic Model for the Inferring of the Penalty." Journal of Computer Science and Technology 33, no. 4 (July 2018): 756–67. http://dx.doi.org/10.1007/s11390-018-1854-z.

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10

Chen, Xiao Zhou. "Score Model Based on Forward-Reverse Databases for Phosphopeptides Identification." Advanced Materials Research 898 (February 2014): 827–30. http://dx.doi.org/10.4028/www.scientific.net/amr.898.827.

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Identification of phosphorylated peptides takes into account factors relevant in matching, building models, and score algorithms. In the paper we make a detailed comparative analysis among various phosphorylation identification methods, and study current mainstream algorithms in database searching and identification, and compares various aspects and methods of algorithms in site assessment. Based on the theory of forward-reverse databases searching, It is proposed a new score model to ensure the quality of identification. Our result shows that PTM and Mascot score models were strongly correlated and complementated in their differentiation abilities. Therefore, PTM and Mascot score models can be combined to filter peptide.
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Більше джерел

Дисертації з теми "PTM MODEL"

1

li, yiwen. "Predicting Hearing Loss Using Auditory Steady-State Responses." Digital WPI, 2009. https://digitalcommons.wpi.edu/etd-theses/84.

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Auditory Steady-State Response (ASSR) is a promising tool for detecting hearing loss. In this project, we analyzed hearing threshold data obtained from two ASSR methods and a gold standard, pure tone audiometry, applied to both normal and hearing-impaired subjects. We constructed a repeated measures linear model to identify factors that show significant differences in the mean response. The analysis shows that there are significant differences due to hearing status (normal or impaired) and ASSR method, and that there is a significant interaction between hearing status and test signal frequency. The second task of this project was to predict the PTA threshold (gold standard) from the ASSR-A and ASSR-B thresholds separately at each frequency, in order to measure how accurate the ASSR measurements are and to obtain a ¡°correction function¡± to correct the bias in the ASSR measurements. We used two approaches. In the first, we modeled the relation of the PTA responses to the ASSR values for the two hearing status groups as a mixture model and tried two prediction methods. The mixture modeling was successful, but the predictions gave disappointing results. A second approach, using logistic regression to predict group membership based on ASSR value and then using those predictions to obtain a predictor of the PTA value, gave successful results.
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2

Abdrachimovas, Ruslanas. "Objektinių modelių transformacijų realizavimas." Master's thesis, Lithuanian Academic Libraries Network (LABT), 2004. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2004~D_20040531_150600-88877.

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Presented work covers one of the most important areas of OMG’s model driven architecture (MDA) – problems of object model transformations. Based on research of OMG specifications and other sources, author analyzes transformation process, states importance of modeling and metamodeling for designing of UML like modeling languages. Research work describes designed metamodels of experimental modeling languages: “Entity – process”, Java metamodel and relational metamodel. Author gives a short overview of model editors for these languages, created using EMF framework tools. Based on analysis, author describes very flexible architecture of model transformation implementation, based on filter and pipes architectural pattern. Usage of this architecture gives flexibility to transformation implementation and allows easy and straightforward decomposition of transformation to separate stages. Designed filter and pipes transformation architecture was used for experimental transformation implementation. Research work presents quality and quantity based results of experimental transformations.
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3

Martinez, Baca Velasco Carlos. "Computational model of a PEM fuel cell." Thesis, Imperial College London, 2007. http://hdl.handle.net/10044/1/11519.

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4

Bi, Wu. "PEM fuel cell catalyst degradation mechanism and mathematical modeling." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/29756.

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Thesis (Ph.D)--Chemical Engineering, Georgia Institute of Technology, 2008.
Committee Chair: Fuller, Thomas; Committee Co-Chair: Deng, Yulin; Committee Member: Gallivan, Martha; Committee Member: Kohl, Paul; Committee Member: Singh, Preet. Part of the SMARTech Electronic Thesis and Dissertation Collection.
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5

McGrady, Christopher Dwain. "Linking Rheological and Processing Behavior to Molecular Structure in Sparsely-Branched Polyethylenes Using Constitutive Relationships." Diss., Virginia Tech, 2009. http://hdl.handle.net/10919/37924.

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This dissertation works towards the larger objective of identifying and assessing the key features of molecular structure that lead to desired polymer processing performance with an ultimate goal of being able to tailor-make specific macromolecules that yield the desired processing response. A series of eight well-characterized, high-density polyethylene (HDPE) resins, with varying degrees of sparse long chain branching (LCB) content, is used to study the effect of both LCB content and distribution on the rheological and commercial processing response using the Pom-pom constitutive relationship. A flow instability known as ductile failure in extensional flow required the development a novel technique known as encapsulation in order to carry out shear-free rheological characterization. Ductile failure prevents the rheological measurement of transient stress growth at higher strains for certain strain-hardening materials. This reduces the accuracy of nonlinear parameters for constitutive equations fit from transient stress growth data, as well as their effectiveness in modeling extensionally driven processes such as film casting. An experimental technique to overcome ductile failure called encapsulation in which the material that undergoes ductile failure is surrounded by a resin that readily deforms homogeneously at higher strains is introduced. A simple parallel model is shown to calculate the viscosity of the core material. The effect of sparse long chain branching, LCB, on the film-casting process is analyzed at various drawdown ratios. A full rheological characterization in both shear and shear-free flows is also presented. At low drawdown ratios, the low-density polyethylenes, LDPE, exhibited the least degree of necking at distances less than the HDPE frostline. The sparsely-branched HDPE resins films had similar final film-widths that were larger than those of the linear HDPE. As the drawdown ratio was increased, film width profiles separated based on branching level. Small amounts of LCB were found to reduce the amount of necking at intermediate drawdown ratios. At higher drawdown ratios, the sparsely-branched HDPE resins of lower LCB had content film-widths that mimicked that of the linear HDPE, while the sparsely-branched HDPE resins of higher LCB content retained a larger film width. Molecular structural analysis via the Pom-pom constitutive model suggested that branching that was distributed across a larger range of backbone lengths serve to improve resistance to necking. As the drawdown ratio increased, the length of the backbones dominating the response decreased, so that the linear chains were controlling the necking behavior of the sparsely-branched resins of lower LCB content while remaining in branched regime for higher LCB content HDPEs. Other processing variables such as shear viscosity magnitude, extrudate swell, and non-isothermal processing conditions were eliminated as contributing factors to the differences in the film width profile. The effect of sparse long chain branching, LCB, on the shear step-strain relaxation modulus is analyzed using a series of eight well-characterized, high-density polyethylene (HDPE) resins. The motivation for this work is in assessing the ability of step-strain flows to provide specific information about a material's branching architecture. Fundamental to this goal is proving the validity of relaxation moduli data at times shorter than the onset of time-strain separability. Strains of 1% to 1250% are imposed on materials with LCB content ranging from zero to 3.33 LCB per 10,000 carbon atoms. All materials are observed to obey time-strain separation beyond some characteristic time, Ï k. The presence of LCB is observed to increase the value of Ï k relative to the linear resin. Furthermore, the amount of LCB content is seen to correlate positively with increasing Ï k. The behavior of the relaxation modulus at times shorter than Ï k is investigated by an analysis of the enhancement seen in the linear relaxation modulus, G0(t), as a function of strain and LCB content. This enhancement is seen to 1) increase with increasing strain in all resins, 2) be significantly larger in the sparsely-branched HDPE resins relative to the linear HDPE resin, and 3) increase in magnitude with increasing LCB content. The shape and smoothness of the damping function is investigated to rule out the presence of wall-slip and material rupture during testing. The finite rise time to impose the desired strain is carefully monitored and compared to the Rouse relaxation time of the linear HDPE resins studied. Sparse LCB is found to increase the magnitude of the relaxation modulus at short times relative to the linear resin. It is shown that these differences are due to variations in the material architecture, specifically LCB content, and not because of mechanical anomalies.
Ph. D.
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6

Sobral, Júnior Mário Alves. "Proposta de modelo para analisar desempenho do Programa de CCQ de uma empresa de eletroeletrônico do PIM." Universidade Federal do Amazonas, 2013. http://tede.ufam.edu.br/handle/tede/3556.

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Made available in DSpace on 2015-04-22T22:10:56Z (GMT). No. of bitstreams: 1 mario sobral.pdf: 1031304 bytes, checksum: 17b78abcce30773ebc357d63a1e2c07b (MD5) Previous issue date: 2013-08-06
The Circle of Quality Control consists on a group of employees who volunteer to support a company, whose goal is to identify, analyze and propose improvements to problems detected in work, besides focusing on professional development and improving the work environment. The company studied has increased focus on financial return of the QCC, having no tools to evaluate the attendant performances and the impact on the work environment In this context, this thesis developed a conceptual model to analyze the performance of the QCC program, at an electronic company located in the Industrial Pole of Manaus, by the perspective of the attendant .Therefore, a study was done based in the program used by the company, literature review and existing models. Based by the models and documentary research, an instrument for data collection was developed and applied together at 60 attendents (leaders and secretaries) in September 2012. From the final results, we developed a conceptual model and the main result has achieved good performance of the current program (80.6%), otherwise identifying further development dimensions related to the company and the work environment when compared with the development of the attendents. Were also identified several opportunities for improvement QCC program at the company.
O Círculo de Controle de Qualidade constitui-se de um grupo de colaboradores voluntários que com o suporte da empresa, têm por objetivo identificar, analisar e propor melhorias para problemas detectados no trabalho, além de focar no desenvolvimento profissional dos circulistas e na melhoria do ambiente de trabalho. A empresa em estudo tem maior foco no retorno financeiro do CCQ, não possuindo ferramenta para avaliar o seu desempenho em relação ao desenvolvimento do participante e do impacto na melhoria do ambiente de trabalho. Neste contexto, a presente dissertação desenvolveu uma proposta de modelo conceitual para analisar o desempenho do programa CCQ em uma empresa de eletroeletrônico no Polo Industrial de Manaus, sob a ótica do participante. Para tanto, foi realizado um estudo para levantar as características do programa CCQ utilizado pela empresa, além de revisão bibliográfica e de modelos existentes. Com base nos modelos e na pesquisa documental, um instrumento de coleta de dados foi desenvolvido e aplicado junto a 60 circulistas (líderes e secretários) em setembro de 2012. A partir da análise dos resultados, desenvolvemos o modelo conceitual e o principal resultado alcançado foi o bom desempenho geral do atual programa (80,6%), porém identificando maior desenvolvimento nas dimensões relacionadas à empresa e ao ambiente de trabalho quando comparados com o desenvolvimento dos circulistas. Também foram identificadas junto aos participantes diversas oportunidades de melhorias para o programa de CCQ da empresa.
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7

Sarmiento, Carnevali Maria Laura. "Modeling and control of PEM fuel cells." Doctoral thesis, Universitat Politècnica de Catalunya, 2017. http://hdl.handle.net/10803/667121.

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Анотація:
In recent years, the PEM fuel cell technology has been incorporated to the R&D plans of many key companies in the automotive, stationary power and portable electronics sectors. However, despite current developments, the technology is not mature enough to be significantly introduced into the energy market. Performance, durability and cost are the key challenges. The performance and durability of PEM fue! cells significantly depend on variations in the concentrations of hydrogen and oxygen in the gas channels, water activity in the catalyst layers and other backing layers, water content in the polymer electrolyte membrane, as well as temperature, among other variables. Such variables exhibit intemal spatial dependence in the direction of the fuel and air streams of the anode and cathode. Highly non-uniform spatial distributions in PEM fuel cells result in local over-heating, cell flooding, accelerated ageing, and lower power output than expected. Despite the importance of spatial variations of certain variables in PEM fuel cells, not many works available in the literature target the control of spatial profiles. Most control-oriented designs use lumped-parameter models because of their simplicity and convenience for controller performance. In contrast, this Doctoral Thesis targets the distributed parameter modelling and control of PEM fuel cells. In the modelling part, the research addresses the detailed development of a non-linear distributed parameter model of a single PEM fuel cell, which incorporates the effects of spatial variations of variables that are relevant to its proper performance. The model is first used to analyse important cell intemal spatial profiles, and it is later simplified in arder to decrease its computational complexity and make it suitable for control purposes. In this task, two different model order reduction techniques are applied and compared. The purpose of the control part is to tackle water management and supply of reactants, which are two major PEM fuel cell operation challenges with important degradation consequences. In this part of the Thesis, two decentralised control strategies based on distributed parameter model predictive controllers are designed, implemented and analysed via simulation environment State observers are also designed to estímate intemal unmeasurable spatial profiles necessary for the control action. The aim of the first strategy is to monitor and control observed water activity spatial profiles on both sides of the membrana to appropriate levels. These target values are carefully chosen to combine proper membrane, catalyst layer and gas diffusion layer humídification, whilst the rate of accumulation of excess liquid water is reduced. The key objective of this approach is to decrease the frequency of water removal actions that cause disruption in the power supplied by the cell, increased parasitic losses or degradation of cell efficiency. The second strategy is a variation of the previous water activity control strategy, which includes the control of spatial distribution of gases in the fuel and air channels. This integrated solution aims to avoid starvation of reactants by controlling corresponding concentration spatial profiles. This approach is intended to prevent PEM fuel cell degradation due to corrosion mechanisms, and thennal stress caused by the consequences of reactant starvation.
A pesar de los avances actuales, la tecnología de celdas de hidrógeno tipo PEM no está suficientemente preparada para ser ampliamente introducida en el mercado energético. Rendimiento, durabilidad y costo son los mayores retos. El rendimiento y la durabilidad de las celdas dependen significativamente de las variaciones en las concentraciones de hidrógeno y oxígeno en los canales de alimentación de gases, la humedad relativa en las capas catalizadoras, el contenido de agua de la membrana polimérica, así como la temperatura, entre otras variables. Dichas variables presentan dependencia espacial interna en la dirección del flujo de gases del ánodo y del cátodo. Distribuciones espaciales altamente no uniformes en algunas variables de la celda resultan en sobrecalentamiento local, inundación, degradación acelerada y menor potencia de la requerida. Muy pocos trabajos disponibles en la literatura se ocupan del control de perfiles espaciales. La mayoría de los diseños orientados a control usan modelos de parámetros concentrados que ignoran la dependencia espacial de variables internas de la celda, debido a la complejidad que añaden al funcionamiento de controladores. En contraste, esta Tesis Doctoral trata la modelización y control de parámetros distribuidos en las celdas de hidrógeno tipo PEM. En la parte de modelización, esta tesis presenta el desarrollo detallado de un modelo no lineal de parámetros distribuidos para una sola celda, el cual incorpora las variaciones espaciales de todas las variables que son relevantes para su correcto funcionamiento. El modelo se usa primero para analizar importantes perfiles espaciales internos, y luego se simplifica para reducir su complejidad computacional y adecuarlo a propósitos de control. En esta tarea se usan y se comparan dos técnicas de reducción de orden de modelos. El propósito de la parte de control es abordar la gestión de agua y el suministro de reactantes, que son dos grandes retos en el funcionamiento de las celdas con importantes consecuencias para su vida útil. En esta parte de la tesis, dos estrategias de control descentralizadas, basadas en controladores predictivos de modelos de referencia con parámetros distribuidos, son diseñadas, implementadas y analizadas en un entorno de simulación. Estas tareas incluyen también el diseño de observadores de estado que estiman los perfiles espaciales internos necesarios para la acción de control. El objetivo de la primera estrategia es monitorear y controlar perfiles espaciales observados de la humedad relativa en las capas catalizadoras para mantenerlos en niveles apropiados. Estos niveles son escogidos cuidadosamente para combinar la correcta humidificación de la membrana y las capas catalizadoras, reduciendo la velocidad de acumulación de agua líquida. El objetivo clave de este enfoque es disminuir la frecuencia de las acciones de remoción de agua dentro de la celda, ya que estas acciones causan interrupción en la potencia suministrada, aumento de las cargas parasitarias y disminución de la eficiencia. La segunda estrategia es una variación de la estrategia anterior que considera adicionalmente el control de la distribución espacial de los gases en los canales del ánodo y cátodo. Esta solución integrada tiene como objetivo evitar la ausencia local de reactantes mediante el control de perfiles espaciales de concentración de gases. Este enfoque pretende prevenir la degradación de las celdas debido a mecanismos de corrosión. Los resultados muestran un mayor rendimiento de la celda considerando los enfoques de control de perfiles espaciales propuestos en esta tesis, en comparación con técnicas de control que ignoran dichos perfiles. Además, la característica descentralizada de los esquemas de control, combinada con el uso de modelos reducidos dentro de los controladores predictivos, tiene un impacto positivo importante en el rendimiento general del control.
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Ragb, Omar B. K. "Advanced model based control for PEM fuel cell stacks." Thesis, Liverpool John Moores University, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.590087.

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Анотація:
This thesis investigates the application of three advanced control strategies in oxygen ratio control of fuel cell stacks. The major objective of these control schemes is to maintain the oxygen ratio at the desired value of 2 for variable load current as disturbance and system uncertainty in order to prevent oxygen starvation. These strategies include, feed-forward (FF) plus feedback (FB) control scheme, model predictive control (MPC) scheme and multi variable control. All the developed methods have been assessed using a non-linear simulation of the fuel cell stack (FCS) model. Satisfactory control performances in terms of effective regulation and robustness to disturbance and system component change have been achieved. FF control has been developed based on neural network, fuzzy logic (5 & 9 membership functions) and look-up table. A PID controller is used in the feedback to adjust the difference between the requested and the actual oxygen ratio by compensating the FF controller output. The simulation results show that, the fuzzy logic and neural network FF controllers performed better than the traditional look-up table and proportional FF controllers. An inverse model control that is based on a radial basis function (RBF) model has been developed and is used as feed-forward approach, and is used in combination with feedback control. Furthermore, the RBF model is updated on-line to cope with rapid change of load current, significant parameters uncertainty and stack time-varying dynamics, which leads to the inverse control being adaptive. Simulations show the effectiveness of the method in rejecting the rapid change of the load current and a simulated actuator fault.
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Seay, Christopher Wayne. "The Role of Branching Topology on Rheological Properties and its Effect on Film-Casting Performance." Diss., Virginia Tech, 2008. http://hdl.handle.net/10919/37671.

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With this research, we work towards the overall objective of customizing polymer molecules in terms of their molecular structure to optimize processing performance. The work includes analysis of the rheology in shear and shear-free flows for sparsely long-chain branched, LCB, polyethylene, PE, resins; determination of the consistency of the molecular based constitutive model, the pom-pom model; for these flows, and evaluation of the same PE resins in film-casting. As we progress towards molecular systems with defined molecular structural characteristics, we transition from a linear low density polyethylene, LLDPE, based series of PE resins to a high density polyethylene, HDPE, based series of PE resins, each with materials of varying degrees of sparse LCB. Evaluation of the shear step-strain rheology for the series of LLDPE-based PE resins allows for the assessment of any inadequacies associated with the step-strain experiments and the ability of the K-BKZ analog of the pom-pom constitutive model to predict step-strain rheological behavior. Finite rise time and wall slip are addressed to ensure the accuracy of the experimental step-strain measurements and eliminated as factors contributing to the stress relaxation moduli response. Analysis of the K-BKZ analog of the pom-pom constitutive model includes comparisons between experimental stress relaxation moduli and predictions from the model using pom-pom model parameters determined from extensional rheology. The results show inconsistencies in the model predictions, where the predictions fail to capture the short time behavior and accurately dampen at larger strains. Pom-pom model parameters are determined using the K-BKZ analog of the pom-pom constitutive model and fitting the stress relaxation moduli. These results are qualitatively consistent indicating that branching occurs on the longest backbone segments, but the values appear to be unrealistic with respect to the molecular theory. Analysis of film-width reduction or necking during film-casting for the series of LLDPE-based resins determines whether uniaxial extensional rheological characteristics, in particular strain-hardening, that are a result of LCB influence the film-necking properties. At the lowest drawdown ratio necking is observed to be reduced with increasing LCB, and thus strain-hardening characteristics. At the higher drawdown ratios it is observed that LCB no longer reduces necking and the curves merge to the results found for linear PE, except in the case of LDPE, which shows reduced necking at all drawdown ratios. Furthermore, comparisons of film necking are also made to separate the effects of molecular weight distribution, MWD, and LCB. The results indicate that both broadening the MWD and the addition of sparse LCB reduce the degree of necking observed. It is established that film necking is more significantly reduced by LCB than by broadening the MWD. Analysis of the uniaxial extensional and dynamic shear rheology with the pom-pom constitutive model reveals that a distribution of branches along shorter relaxation time modes is important in reducing necking at higher drawdown ratios. Factors such as shear viscosity effects, extrudate swell, and non-isothermal behavior were eliminated as contributing factors because of the similar shear viscosity curves, N1 curves, and activation energies among the sparsely LCB PE resins. The same experimental concepts have been extended to the series of HDPE-based resins, but the lack of adequate uniaxial extensional data prevents a thorough analysis with respect to uniaxial extensional characteristics. Regardless, in the context of step-strain rheology, the results were found to be similar with those of the LLDPE-based series of resins, where a distinctive shape at short times was observed for any of the PE resins possessing some level of LCB that was not apparent in the linear PE resins. Film-casting revealed similar results to those of the LLDPE-based materials as well, but a broader spectrum of drawdown ratios revealed greater insight into how the distribution of branching controls the film-casting response. At low drawdown ratios all materials exhibit the same necking behavior. At intermediate drawdown ratios separation occurs where the linear PE resins experiences the most drastic necking, the sparsely LCB PE resins show reduced necking, and the LDPE shows an even greater reduction in necking. Progression then to the higher drawdown ratios results in similar necking behavior for the linear and sparsely LCB PE resins and greatly reduced necking for the LDPE. These results support the idea that to reduce necking the backbone segments that dominate the film-casting behavior must contain some level of LCB.
Ph. D.
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Boyce, John S. "Linking PPBES and the POM with capabilities." Thesis, Monterey, Calif. : Naval Postgraduate School, 2006. http://bosun.nps.edu/uhtbin/hyperion.exe/06Dec%5FBoyce.pdf.

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Книги з теми "PTM MODEL"

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United States. National Aeronautics and Space Administration, ed. PTA testbed aircraft engine inlet model test report. [Washington, DC]: NASA, 1985.

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2

Korea (South). Kisangchʻŏng. Yeboguk. Dijitʻŏl Yebo Kaebalkwa., ред. Dijitʻŏl yebo model kaebal mit hyŏnŏp unyŏng chʻegye: Sirhwang charyo chʻŏri modyul, PPM model. [Seoul]: Kisangchʻŏng Yeboguk Dijitʻŏl Yebo Kaebalkwa, 2006.

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3

Rao, K. Shankar. User's guide for PEM-2: Pollution episodic model (version 2). Silver Spring, Md: U.S. Dept. of Commerce, National Oceanic and Atmospheric Administration, Environmental Research Laboratories, 1985.

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Rao, K. Shankar. User's guide for PEM-2: Pollution episodic model (version 2). Research Triangle Park, NC: U.S. Environmental Protection Agency, Atmospheric Sciences Research Laboratory, 1987.

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Rao, K. Shankar. User's guide for PEM-2: Pollution episodic model (version 2). Silver Spring, Md: U.S. Dept. of Commerce, National Oceanic and Atmospheric Administration, Environmental Research Laboratories, 1985.

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Rao, K. Shankar. User's guide for PEM-2: Pollution episodic model (version 2). Research Triangle Park, NC: U.S. Environmental Protection Agency, Atmospheric Sciences Research Laboratory, 1987.

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Rao, K. Shankar. User's guide for PEM-2: Pollution episodic model (version 2). Silver Spring, Md: U.S. Dept. of Commerce, National Oceanic and Atmospheric Administration, Environmental Research Laboratories, 1985.

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Rao, K. Shankar. User's guide for PEM-2: Pollution episodic model (version 2). Silver Spring, Md: U.S. Dept. of Commerce, National Oceanic and Atmospheric Administration, Environmental Research Laboratories, 1985.

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Rao, K. Shankar. User's guide for PEM-2: Pollution episodic model (version 2). Research Triangle Park, NC: U.S. Environmental Protection Agency, Atmospheric Sciences Research Laboratory, 1987.

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Rao, K. Shankar. User's guide for PEM-2: Pollution episodic model (version 2). Silver Spring, Md: U.S. Dept. of Commerce, National Oceanic and Atmospheric Administration, Environmental Research Laboratories, 1985.

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Частини книг з теми "PTM MODEL"

1

Wang, Qian, Zhaohui Peng, Fei Jiang, and Qingzhong Li. "LSA-PTM: A Propagation-Based Topic Model Using Latent Semantic Analysis on Heterogeneous Information Networks." In Web-Age Information Management, 13–24. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-38562-9_2.

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Cammi, Roberto. "The PCM Model." In Molecular Response Functions for the Polarizable Continuum Model, 1–11. Cham: Springer International Publishing, 2013. http://dx.doi.org/10.1007/978-3-319-00987-2_1.

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Stiebeling, Reik Benjamin. "PIM – Das Picture-Interpretation-Model." In Das Picture Interpretation Model, 125–35. Wiesbaden: Springer Fachmedien Wiesbaden, 2019. http://dx.doi.org/10.1007/978-3-658-27764-2_4.

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Anisimov, Vladimir, and Yuri Izyumov. "Periodic Anderson Model (PAM)." In Springer Series in Solid-State Sciences, 173–201. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-04826-5_5.

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Quang, Pham Thu, and Cyrille Chartier-Kastler. "Physical Data Model (PDM)." In MERISE in Practice, 121–24. London: Macmillan Education UK, 1991. http://dx.doi.org/10.1007/978-1-349-12314-8_13.

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Kwon, Nahyun, and Marco Comuzzi. "Genetic Algorithms for AutoML in Process Predictive Monitoring." In Lecture Notes in Business Information Processing, 242–54. Cham: Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-27815-0_18.

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AbstractIn recent years, AutoML has emerged as a promising technique for reducing computational and time cost by automating the development of machine learning models. Existing AutoML tools cannot be applied directly to process predictive monitoring (PPM), because they do not support several configuration parameters that are PPM-specific, such as trace bucketing or encoding. In other words, they are only specialized in finding the best configuration of machine learning model hyperparameters. In this paper, we present a simple yet extensible framework for AutoML in PPM. The framework uses genetic algorithms to explore a configuration space containing both PPM-specific parameters and the traditional machine learning model hyperparameters. We design four different types of experiments to verify the effectiveness of the proposed approach, comparing its performance in respect of random search of the configuration space, using two publicly available event logs. The results demonstrate that the proposed approach outperforms consistently the random search.
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Messaadia, Mourad, Fatah Benatia, David Baudry, and Anne Louis. "PLM Adoption Model for SMEs." In Product Lifecycle Management and the Industry of the Future, 13–22. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-72905-3_2.

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Leino, Simo-Pekka, Juha-Pekka Anttila, Juhamatti Heikkilä, Joonas Aaltonen, and Kaj Helin. "PLM Impact Analysis Model – PIA." In Product Lifecycle Management. Towards Knowledge-Rich Enterprises, 501–11. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-35758-9_45.

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Boduszek, Daniel, Agata Debowska, and Dominic Willmott. "Psychopathic Personality Traits Model (PPTM)." In Routledge International Handbook of Psychopathy and Crime, 216–24. Abingdon, Oxon ; New York, NY : Routledge, 2019. | Series: Routledge international handbooks: Routledge, 2018. http://dx.doi.org/10.4324/9781315111476-14.

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Kunusch, Cristian, Paul Puleston, and Miguel Mayosky. "PEM Fuel Cell Systems." In Sliding-Mode Control of PEM Fuel Cells, 13–33. London: Springer London, 2012. http://dx.doi.org/10.1007/978-1-4471-2431-3_2.

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Тези доповідей конференцій з теми "PTM MODEL"

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Algarni, Abdulmohsen, Yuefeng Li, and Yue Xu. "Adaptive Information Filtering Based on PTM Model (APTM)." In 2008 IEEE/WIC/ACM International Conference on Web Intelligence and Intelligent Agent Technology. IEEE, 2008. http://dx.doi.org/10.1109/wiiat.2008.305.

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Jiang, Jianhui, Guangming Lu, and Zhen Wang. "Methods for Approximate Adders Reliability Estimation Based on PTM Model." In 2018 IEEE 23rd Pacific Rim International Symposium on Dependable Computing (PRDC). IEEE, 2018. http://dx.doi.org/10.1109/prdc.2018.00038.

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Xiao, Jie, Jianhui Jiang, Xuguang Zhu, and Chengtian Ouyang. "A Method of Gate-Level Circuit Reliability Estimation Based on Iterative PTM Model." In 2011 IEEE 17th Pacific Rim International Symposium on Dependable Computing (PRDC). IEEE, 2011. http://dx.doi.org/10.1109/prdc.2011.45.

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Franich, Andjela, Ivana Vasić, Snežana Rajković, Aleksandar Arsenijević, Marija Milovanović, Nebojša Arsenijević, Jelena Milovanović, and Marija Živković. "CYTOTOXICITY OF CATIONIC DINUCLEAR PLATINUM(II) COMPLEXES IN AN EXPERIMENTAL MODEL OF MOUSE COLON CANCER." In 1st INTERNATIONAL Conference on Chemo and BioInformatics. Institute for Information Technologies, University of Kragujevac, 2021. http://dx.doi.org/10.46793/iccbi21.293f.

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The series of nine dinuclear platinum(II) complexes, [{Pt(L)Cl}2(μ-X)]2+ (where L is two NH3 or bidentantly coordinated diamine ligand – ethylenediamine, en; (±)-1,2-propylenediamine, 1,2-pn; isobutylenediamine, ibn; trans-(±)-1,2-diaminocyclohexane, dach; 1,3-propylenediamine, 1,3-pd; 2,2- dimethyl-1,3-propylenediamine, 2,2-diMe-1,3-pd; (±)-1,3-pentanediamine,1,3-pnd, and X is a bridging pyrazine (pz) or pyridazine (pydz) ligand) have been synthesized and characterized. The antitumor potential of these complexes against CT26 cells were determined by in vitro and in vivo assays. A murine model of heterotopic colon cancer tumor was induced in immunocompetent BALB/c mice for investigating antitumor potential of the Pt(II) complexes in vivo. It was found that complexes Pt1, Pt2 and Pt7 shows significant in vitro cytotoxic activity against mouse colon carcinoma CT26 cells, while all these complexes show moderate apoptotic effect. Complexes Pt1 and Pt7 arrested CT26 cells in G2/M phase of cell cycle, while complexes Pt5 and Pt6 exerted the highest antiproliferative effect which was evaluated by detection of Ki67 expressing cells. Complexes Pt1 and Pt2 performed significant in vivo antitumor effects reducing the growth of primary tumor and the incidence of lung and liver metastases without causing the significant hepato- and nephro- toxicity.
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Yershov, Sergiy, and Viktor Yakovlev. "Validation of the PTM Transition Model on a 3D Flow Through a Turbine Cascade." In ASME 2016 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/imece2016-65001.

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This study presents a numerical simulation of a 3D viscous subsonic flow in the VKI-Genoa turbine cascade taking into account the laminar-turbulent transition. The numerical simulation is performed using the Reynolds-averaged Navier-Stokes (RANS) equations and the low-Reynolds k-ω SST turbulence model. The Langtry’s algebraic Production Term Modification (PTM) model is applied for modeling the laminar-turbulent transition. The governing equations are integrated using the second-order accurate Godunov’s type implicit ENO scheme. Computations of both fully turbulent and transitional flows are carried out. Much attention is given to the comparison between the present numerical results and the existing experimental data. The comparison was based on the surface distributions of the isentropic velocity, the friction velocity, the flow acceleration parameter, the displacement thickness, the shape-factor, and the momentum thickness Reynolds number. Velocity profiles upstream and downstream of the transition onset were compared also. The numerical results obtained show an influence of the transition on the secondary flow pattern. In the case of the transitional flow, when compared with the fully turbulence flow case, the endwall boundary layer cross-flow starts upstream, and it is more intensive, but less massive due to a thinner boundary layer in the laminar flow region.
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Maeda, Akiyoshi, Akira Sou, and Akio Tomiyama. "A Hybrid Method for Simulating Flows Including Fluid Particles." In ASME 2006 2nd Joint U.S.-European Fluids Engineering Summer Meeting Collocated With the 14th International Conference on Nuclear Engineering. ASMEDC, 2006. http://dx.doi.org/10.1115/fedsm2006-98156.

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A hybrid CMFD (computational multi-fluid dynamics) method is proposed for the prediction of multiphase flows including large-scale interface, poly-dispersed bubbles and/or drops. The method is the hybrid integration of an interface tracking method (ITM), three kinds of particle tracking methods (PTM) and an averaging method based on a multi-fluid model (MFM). The integration enables us (1) to cover a wide range of d* = d/Δx, where d is the particle diameter and Δx the grid size, and (2) to perform various kinds of multiphase CFD such as standard interface tracking, particle tracking and multi-fluid simulations, and hybrid simulations using an arbitrary combination of ITM, PTM and MFM. The field and constitutive equations of the proposed method are described in detail. A poly-dispersed air-water bubbly flow and several bubble plumes in a small open vessel are simulated using the proposed hybrid method to demonstrate its potential.
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"Efficiency Requirements in PIM to PSM Transformations." In International Workshop on Model-Driven Architecture and Modeling Theory-Driven Development. SciTePress - Science and and Technology Publications, 2010. http://dx.doi.org/10.5220/0003044800930098.

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Wang, Chi, Xuebei Zhang, Jingchao Feng, Muhammad Shehzad Khan, Minyou Ye, and Hongli Chen. "Development and Application of Multi-Physics Safety Analysis Code for Advanced Liquid Metal Cooled Reactor." In 2018 26th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/icone26-81973.

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The simulation of 3D thermal-hydraulic problem for the pool type fast reactors, is one of the necessary and great importance. Most system codes can’t be used to simulate multi-dimensional thermal-hydraulics problems, whereas, the CFD method is suitable to deal with these type of simulation challenges. Based on the CFD method, a neutronics and thermohydraulic coupling code FLUENT/PK for nuclear reactor safety analysis by coupling the commercial CFD code FLUENT with the point kinetics model (PKM) and the pin thermal model (PTM) is developed by University of Science and Technology of China (USTC). The coupled code is verified by comparing with a series of benchmarks on beam interruptions in a lead-bismuth-cooled and MOX-fuelled accelerator-driven system. The variations of transient power, fuel temperature and outlet coolant temperature all agree well with the benchmark results. The validation results show that the code can be used to simulate the transient accidents of critical and sub-critical lead/lead-bismuth cooled reactors. Then this coupling code is used to evaluate the safety performance of MYRRHA (Multi-purpose Hybrid Research Reactor for High-tech Applications) at unprotected beam over-power (UBOP) accident, and M2LFR-1000 (Medium-size Modular Lead-cooled Fast Reactor) at the unprotected transient over-power (UTOP) and unprotected loss of flow (ULOF) accident. The transient power, the temperature of coolant and fuel and multi-dimensional flow phenomena in upper plenum and lower plenum are presented and discussed in this paper.
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Zolotas, Athanasios, Horacio Hoyos Rodriguez, Dimitrios S. Kolovos, Richard F. Paige, and Stuart Hutchesson. "Bridging Proprietary Modelling and Open-Source Model Management Tools: The Case of PTC Integrity Modeller and Epsilon." In 2017 ACM/IEEE 20th International Conference on Model-Driven Engineering Languages and Systems (MODELS). IEEE, 2017. http://dx.doi.org/10.1109/models.2017.18.

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Gall, Dariusz. "From PIM and PSM with Performance Annotation to Palladio Models." In 17th International Conference on Evaluation of Novel Approaches to Software Engineering. SCITEPRESS - Science and Technology Publications, 2022. http://dx.doi.org/10.5220/0011090900003176.

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Звіти організацій з теми "PTM MODEL"

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Plohr, JeeYeon N. Preston-Tonks-Wallace (PTW) Visco-Plasticity Model. Office of Scientific and Technical Information (OSTI), September 2018. http://dx.doi.org/10.2172/1469503.

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Liu, X., P. McAllister, A. Peter, M. Sivakumar, Y. Liu, and F. Hu. YANG Data Model for Protocol Independent Multicast (PIM). RFC Editor, October 2022. http://dx.doi.org/10.17487/rfc9128.

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Allen, Jeffrey, Robert Moser, Zackery McClelland, Md Mohaiminul Islam, and Ling Liu. Phase-field modeling of nonequilibrium solidification processes in additive manufacturing. Engineer Research and Development Center (U.S.), December 2021. http://dx.doi.org/10.21079/11681/42605.

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Анотація:
This project models dendrite growth during nonequilibrium solidification of binary alloys using the phase-field method (PFM). Understanding the dendrite formation processes is important because the microstructural features directly influence mechanical properties of the produced parts. An improved understanding of dendrite formation may inform design protocols to achieve optimized process parameters for controlled microstructures and enhanced properties of materials. To this end, this work implements a phase-field model to simulate directional solidification of binary alloys. For applications involving strong nonequilibrium effects, a modified antitrapping current model is incorporated to help eject solute into the liquid phase based on experimentally calibrated, velocity-dependent partitioning coefficient. Investigated allow systems include SCN, Si-As, and Ni-Nb. The SCN alloy is chosen to verify the computational method, and the other two are selected for a parametric study due to their different diffusion properties. The modified antitrapping current model is compared with the classical model in terms of predicted dendrite profiles, tip undercooling, and tip velocity. Solidification parameters—the cooling rate and the strength of anisotropy—are studied to reveal their influences on dendrite growth. Computational results demonstrate effectiveness of the PFM and the modified antitrapping current model in simulating rapid solidification with strong nonequilibrium at the interface.
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Liu, X., and J. Xu. YANG Data Model for the Precision Time Protocol (PTP). Edited by Y. Jiang and R. Cummings. RFC Editor, May 2019. http://dx.doi.org/10.17487/rfc8575.

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Plohr, JeeYeon. The Preston-Tonks-Wallace (PTW) Model Parameterization of AU. Office of Scientific and Technical Information (OSTI), December 2020. http://dx.doi.org/10.2172/1735887.

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Sjue, Sky K., and Michael B. Prime. Analytic EoS and PTW strength model recommendation for Starck Ta. Office of Scientific and Technical Information (OSTI), September 2016. http://dx.doi.org/10.2172/1304821.

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Schraad, Mark William, Manolo Edgar Sherrill, Scott Crockett, Tariq Dennis Aslam, Dean Laverne Preston, Robert Allen Gore, Albert Comstock III Kahler, and Stephanie Cate Frankle. ASC Physics and Engineering Models (PEM) Program Overview. Office of Scientific and Technical Information (OSTI), June 2015. http://dx.doi.org/10.2172/1186049.

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Daniell, Robert E., and Jr. Improvements to the PRISM and PIM Ionospheric Models. Fort Belvoir, VA: Defense Technical Information Center, August 1999. http://dx.doi.org/10.21236/ada388875.

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Rempel, K. U., A. E. Williams-Jones, and K. Fuller. An experimental investigation of the solubility and speciation of uranium in hydrothermal ore fluids. Natural Resources Canada/CMSS/Information Management, 2021. http://dx.doi.org/10.4095/328995.

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Анотація:
Experimental data on the solubility and speciation of uranium in hydrothermal solution is required to improve genetic models for the formation of ore deposits, yet very few data of this type have been published. Of particular interest is the oxidation state of the uranium in solution, as conventional wisdom suggests that U is dissolved in the oxidized U(VI) state and precipitated as reduced U(IV) minerals, yet recent experiments have shown ppm-level solubility for U(IV). This study investigated the mobility of reduced U(IV) and oxidized U(VI) in acidic (pH = 2), fluoride- bearing and alkaline (pH = 10), chloride-bearing solutions at 100-200°C and 1 to 15.8 bars (0.1-1.58 MPa). Preliminary data for the mobility of U(IV) in pH 2 fluids with 0.01 m F- show concentrations of 1.76 to 3.92 ppm U at 200°C, indicating that, contrary to common belief, the reduced U(IV) can be transported in solution. We have also conducted experiments on U(VI) solubility in pH 2 fluoride-bearing, and pH 10 chloride-bearing solutions. Uranium concentrations in the F- -bearing experiments ranged from 624 to 1570 ppm (avg. 825 ppm, n = 6) at 100°C, 670 to 1560 ppm (avg. 931 ppm, n = 4) at 150°C, and 3180 to 7550 ppm (avg. 5240, n = 9) at 200°C. In comparison, U concentrations in the Cl- -bearing runs range from 86.1 to 357 ppm (avg. 185 ppm, n = 15) at 200°C. Clearly, oxidized U(VI) is very readily mobilized in hydrothermal fluids. However, the measured concentrations of U(VI) are independent of those of F- or Cl-, suggesting the formation of U oxide or hydroxide species rather than U chlorides or fluorides. These experimental data will be verified and supplemented in future experiments, which will be used to derive the stoichiometry and thermodynamic constants for the dominant uranium species in hydrothermal solutions. The data from this study will then be integrated into a comprehensive genetic model for uranium ore-forming systems.
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Krakowski, R. A. APT cost scaling: Preliminary indications from a Parametric Costing Model (PCM). Office of Scientific and Technical Information (OSTI), February 1995. http://dx.doi.org/10.2172/39121.

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