scholarly journals The reference component of PEP

1997 ◽  
pp. 65-80 ◽  
Author(s):  
Bernd Grahlmann
Keyword(s):  
Reference Component

Synergy between topology optimization and additive manufacturing in the automotive field

2020 ◽  
pp. 095440542094920 ◽  
Author(s):  
S Mantovani ◽  
SG Barbieri ◽  
M Giacopini ◽  
A Croce ◽  
A Sola ◽  
...  
Keyword(s):  
Topology Optimization ◽  
Additive Manufacturing ◽  
Holistic Approach ◽  
Numerical Control ◽  
Structural Constraints ◽  
Element Analysis ◽  
Design Guideline ◽  
Numerical Control Machining ◽  
Optimization Constraints ◽  
Reference Component

This article purposes on developing and on re-interpreting the numerical results of a topology optimization for a structural component built via additive manufacturing. A critical appraisal of the optimization results is presented by modeling the feasible component with a holistic approach that merges structural and manufacturing requirements. The procedure is expected to provide a design guideline for similar applications of practical relevance, toward an increase of the right-first-time parts that is required to bring additive manufacturing to its full competitiveness. Topology optimization of a steering upright for a Formula SAE racing car was performed by targeting weight minimization while complying with severe structural constraints, like global and local stiffness performance. Cornering, bumping and braking vehicle conditions were considered. The optimization constraints were evaluated via finite element analysis on a reference component, where the loading conditions were retrieved from telemetry data. The reference part was manufactured by computer numerical control machining from a solid aluminum block. Spurred by the interpretation of the topology optimization predictions, a new upright geometry was designed and validated by calculating its stress field and the possible occurrence of Euler buckling. The new upright was 9% lighter than the reference component. The new geometry was analyzed according to Design for Additive Manufacturing principles to choose the orientation on the build platform and the supports’ location and geometry. The part was successfully manufactured and proved consistent with the application.

scholarly journals Compositional Data Analysis of Microbiome and Any-Omics Datasets: A Validation of the Additive Logratio Transformation

2021 ◽  
Vol 12 ◽  
Author(s):  
Michael Greenacre ◽  
Marina Martínez-Álvaro ◽  
Agustín Blasco
Keyword(s):  
Data Analysis ◽  
Compositional Data ◽  
High Dimensional ◽  
Compositional Data Analysis ◽  
Rna Transcripts ◽  
Operational Taxonomic Units ◽  
Logratio Transformation ◽  
Large Numbers ◽  
Fixed Reference ◽  
Reference Component

Microbiome and omics datasets are, by their intrinsic biological nature, of high dimensionality, characterized by counts of large numbers of components (microbial genes, operational taxonomic units, RNA transcripts, etc.). These data are generally regarded as compositional since the total number of counts identified within a sample is irrelevant. The central concept in compositional data analysis is the logratio transformation, the simplest being the additive logratios with respect to a fixed reference component. A full set of additive logratios is not isometric, that is they do not reproduce the geometry of all pairwise logratios exactly, but their lack of isometry can be measured by the Procrustes correlation. The reference component can be chosen to maximize the Procrustes correlation between the additive logratio geometry and the exact logratio geometry, and for high-dimensional data there are many potential references. As a secondary criterion, minimizing the variance of the reference component's log-transformed relative abundance values makes the subsequent interpretation of the logratios even easier. On each of three high-dimensional omics datasets the additive logratio transformation was performed, using references that were identified according to the abovementioned criteria. For each dataset the compositional data structure was successfully reproduced, that is the additive logratios were very close to being isometric. The Procrustes correlations achieved for these datasets were 0.9991, 0.9974, and 0.9902, respectively. We thus demonstrate, for high-dimensional compositional data, that additive logratios can provide a valid choice as transformed variables, which (a) are subcompositionally coherent, (b) explain 100% of the total logratio variance and (c) come measurably very close to being isometric. The interpretation of additive logratios is much simpler than the complex isometric alternatives and, when the variance of the log-transformed reference is very low, it is even simpler since each additive logratio can be identified with a corresponding compositional component.

scholarly journals Pyrolysis and Combustion Chemistry of Pyrrole, a Reference Component for Bio-oil Surrogates: Jet-Stirred Reactor Experiments and Kinetic Modeling

2021 ◽  
Author(s):  
Matteo Pelucchi ◽  
Suphaporn Arunthanayothin ◽  
Yu Song ◽  
Olivier Herbinet ◽  
Alessandro Stagni ◽  
...  
Keyword(s):  
Kinetic Modeling ◽  
Combustion Chemistry ◽  
Stirred Reactor ◽  
Bio Oil ◽  
Reference Component

scholarly journals PENGEMBANGAN KURIKULUM PENDIDIKAN AGAMA ISLAM MODEL KURIKULUM 2013 DI SD MUHAMMADIYAH YOGYAKARTA

2019 ◽  
Vol 1 (1) ◽  
pp. 64
Author(s):  
RR. Ninik Barokatul Khasanah ◽  
Hendro Widodo
Keyword(s):  
Elementary School ◽  
Educational Goals ◽  
Educational Activities ◽  
Absolute Requirement ◽  
Regional Leadership ◽  
Leadership Curriculum ◽  
Regional Leaders ◽  
Reference Component ◽  
Regional Education

The curriculum is a reference component for each education unit and directs all forms of educational activities to achieve educational goals. The curriculum becomes an absolute requirement of education and becomes an integral part of education and teaching.Muhammadiyah Jogokariyan Elementary School Yogyakarta is one of Muhammadiyah's Business Charities under the Regional Education Council of Muhammadiyah Yogyakarta Regional Leaders also uses 2 curricula (government curriculum and Muhammadiyah Yogyakarta Regional Leadership curriculum).One of the curriculums developed at Muhammadiyah Jogokariyan Elementary School in Yogyakarta is about memorizing the Qur'an, thank God that with Tahfidz every year his students always increase and gain the trust of the community.

Compatibilization of Two Immiscible Homopolymers

2006 ◽  
Author(s):  
Chang Dae Han
Keyword(s):  
Mechanical Properties ◽  
Molecular Weight ◽  
Block Copolymer ◽  
Interfacial Tension ◽  
Absolute Temperature ◽  
Boltzmann Constant ◽  
Immiscible Polymer Blends ◽  
Immiscible Polymers ◽  
Interaction Parameter Χ ◽  
Reference Component

More often than not, the mechanical properties (e.g., impact and tensile properties) of immiscible polymer blends are very poor owing to the lack of adhesion between the constituent components, which originates from strong repulsive thermodynamic (segmental) interactions. Therefore, in the past, a great deal of effort (Barlow and Paul 1984; Fayt and Teyssie 1989; Fayt et al. 1981, 1987, 1989; Gupta and Purwar 1985; Ouhadi et al. 1986a; Park et al. 1992; Schwarz et al. 1988, 1989; Srinivasan and Gupta 1994; Traugott et al. 1983) has been made to improve the mechanical properties of two immiscible polymers by adding a third component (e.g., a block copolymer). In this chapter, we confine our attention primarily to the situations where a nonreactive third component is added to two immiscible homopolymers in order to improve their mechanical properties. A polymer blend consisting of two immiscible homopolymers (say, A and B) has a very narrow interface, as schematically shown in Figure 4.1, because they have strong repulsive segmental interactions giving rise to a positive value of the Flory–Huggins interaction parameter (χ), i.e., χAB > 0. Helfand and Tagami (1971, 1972) derived the following expression relating the interfacial thickness d of a pair of immiscible homopolymers of infinite molecular weight to χ: . . . d = 2b/(6χ)1/2 (4.1). . . where the Kuhn length b is assumed to be the same for both components. They also derived an expression for the interfacial tension γ between two immiscible homopolymers: . . . γ = (χ/6)1/2bρokBT . . . in terms of χ, where kB is the Boltzmann constant, T is the absolute temperature, and ρo is the reference density (the inverse of monomeric volume of a reference component). Equation (4.1) indicates that the interfacial thickness between two immiscible homopolymers will be larger when the extent of repulsive segmental interactions is less, and Eq. (4.2) indicates that the interfacial tension between two immiscible homopolymers will be lower when the extent of repulsive segmental interactions is less.

scholarly journals Author Correction: Reference component analysis of single-cell transcriptomes elucidates cellular heterogeneity in human colorectal tumors

2018 ◽  
Vol 50 (12) ◽  
pp. 1754-1754 ◽  
Author(s):  
Huipeng Li ◽  
Elise T Courtois ◽  
Debarka Sengupta ◽  
Yuliana Tan ◽  
Kok Hao Chen ◽  
...  
Keyword(s):  
Single Cell ◽  
Component Analysis ◽  
Cellular Heterogeneity ◽  
Colorectal Tumors ◽  
Reference Component

scholarly journals Approach to precise indoor characterization of multi-junction CPV cells using reference component cells

2013 ◽  
Author(s):  
Daisuke Nishi ◽  
Takashi Ueda ◽  
Hironori Ohshima ◽  
Yoshihiro Hishikawa
Keyword(s):  
Reference Component

Reference component analysis of single-cell transcriptomes elucidates cellular heterogeneity in human colorectal tumors

2017 ◽  
Vol 49 (5) ◽  
pp. 708-718 ◽  
Author(s):  
Huipeng Li ◽  
Elise T Courtois ◽  
Debarka Sengupta ◽  
Yuliana Tan ◽  
Kok Hao Chen ◽  
...  
Keyword(s):  
Single Cell ◽  
Component Analysis ◽  
Cellular Heterogeneity ◽  
Colorectal Tumors ◽  
Reference Component
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