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Auteur : Grafiati

Publié le 11 mars 2023

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1

Brecher, Christian, Thomas Breitbach, Simon Müller, Marcel Ph Mayer, Barbara Odenthal, Christopher M. Schlick et Werner Herfs. « 3D Assembly Group Analysis for Cognitive Automation ». Journal of Robotics 2012 (2012) : 1–18. http://dx.doi.org/10.1155/2012/375642.

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A concept that allows the cognitive automation of robotic assembly processes is introduced. An assembly cell comprised of two robots was designed to verify the concept. For the purpose of validation a customer-defined part group consisting of Hubelino bricks is assembled. One of the key aspects for this process is the verification of the assembly group. Hence a software component was designed that utilizes the Microsoft Kinect to perceive both depth and color data in the assembly area. This information is used to determine the current state of the assembly group and is compared to a CAD model for validation purposes. In order to efficiently resolve erroneous situations, the results are interactively accessible to a human expert. The implications for an industrial application are demonstrated by transferring the developed concepts to an assembly scenario for switch-cabinet systems.

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2

Chen, Ru, Ji Xin Yang, De Quan Wang, Xue Heng Tao, Jin Shi Cheng et Peng Zhang. « The Design and Application of Group Supporting Information Management System of the Designated Assemble Line ». Applied Mechanics and Materials 330 (juin 2013) : 708–11. http://dx.doi.org/10.4028/www.scientific.net/amm.330.708.

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Group supporting information management system of the designated assemble line can real-time track the assembly processes of production line, count and analyze the parts plan output, plan working time, actual output, actual working time, spare parts inventory and other relevant data of production line in the production of the various stages, to improve and define the parts in the technological process of the production line, ensure the problems in the assembly process of the production line can be processed in time, to ensure the assembly parts can be matched not only on the production but also on the time of nodes of planned versus actual in the process of production assembly line,. This system has been put into commercial production; showed the effectiveness of the system.

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Galkin, M. G., et A. S. Smagin. « PRACTICE OF DIMENSIONAL IN THE IMPLEMENTATION OF THE METHODOLOGY OF GROUP INTERCHANGEABILITY ». Spravochnik. Inzhenernyi zhurnal, n^o 273 (décembre 2019) : 13–18. http://dx.doi.org/10.14489/hb.2019.12.pp.013-018.

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The subject of consideration in this article is the process of modeling the dimensional relationships at the Assembly stage using a single-circuit graph size scheme, which describes the mechanism of the individual parts of the conjugation in the implementation of the Assembly area group interchangeability methodology, reflecting the specific conditions of production. In the context of dimensional modeling, calculation procedures are considered on the basis of the developed mathematical model, which can be applied to both single-circuit and multi-circuit size schemes with dependent size chains. In particular, for the conditions of large-scale production, the algorithm for determining the scattering field of the assembled parts sizes by sorting them into size groups is considered. The design procedure is considered on the concrete example which describes a variant of completing of details with rather wide tolerances in the Assembly unit meeting the set criterion of working capacity.

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Fruchart, Michel, Seung-Yeol Jeon, Kahyun Hur, Vadim Cheianov, Ulrich Wiesner et Vincenzo Vitelli. « Soft self-assembly of Weyl materials for light and sound ». Proceedings of the National Academy of Sciences 115, n^o 16 (2 avril 2018) : E3655—E3664. http://dx.doi.org/10.1073/pnas.1720828115.

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Soft materials can self-assemble into highly structured phases that replicate at the mesoscopic scale the symmetry of atomic crystals. As such, they offer an unparalleled platform to design mesostructured materials for light and sound. Here, we present a bottom-up approach based on self-assembly to engineer 3D photonic and phononic crystals with topologically protected Weyl points. In addition to angular and frequency selectivity of their bulk optical response, Weyl materials are endowed with topological surface states, which allow for the existence of one-way channels, even in the presence of time-reversal invariance. Using a combination of group-theoretical methods and numerical simulations, we identify the general symmetry constraints that a self-assembled structure has to satisfy to host Weyl points and describe how to achieve such constraints using a symmetry-driven pipeline for self-assembled material design and discovery. We illustrate our general approach using block copolymer self-assembly as a model system.

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Aguerri, J. A. L., A. Longobardi, S. Zarattini, A. Kundert, E. D’Onghia et L. Domínguez-Palmero. « Fossil group origins ». Astronomy & ; Astrophysics 609 (janvier 2018) : A48. http://dx.doi.org/10.1051/0004-6361/201731711.

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Context. It is thought that fossil systems are relics of structure formation in the primitive Universe. They are galaxy aggregations that have assembled their mass at high redshift with few or no subsequent accretion. Observationally these systems are selected by large magnitude gaps between their 1st and 2nd ranked galaxies (Δm12). Nevertheless, there is still debate over whether or not this observational criterium selects dynamically evolved ancient systems. Aims. We have studied the properties of the nearby fossil group RX J075243.6+455653 in order to understand the mass assembly of this system. Methods. Deep spectroscopic observations allow us to construct the galaxy luminosity function (LF) of RX J075243.6+455653 down to Mr*+6. The analysis of the faint-end of the LF in groups and clusters provides valuable information about the mass assembly of the system. In addition, we have analyzed the nearby large-scale structure around this group. Results. We identified 26 group members within r200 ~ 0.96 Mpc. These galaxies are located at Vc = 15551 ± 65 km s-1 and have a velocity dispersion of σc = 333 ± 46 km s-1. The X-ray luminosity of the group is LX = 2.2 × 1043 h70-2 erg s-1, resulting in a mass of M = 4.2 × 1013 h70-1 within 0.5r200. The group has Δm12 = 2.1 within 0.5r200, confirming the fossil nature of this system. RX J075243.6+455653 has a central brightest group galaxy (BGG) with Mr = −22.67, one of the faintest BGGs observed in fossil systems. The LF of the group shows a flat faint-end slope (α = −1.08 ± 0.33). This low density of dwarf galaxies is confirmed by the low value of the dwarf-to-giant ratio (DGR = 0.99 ± 0.49) for this system. Both the lack of dwarf galaxies and the low luminosity of the BGG suggests that RX J075243.6+455653 still has to accrete mass from its nearby environment. This mass accretion will be achieved because it is the dominant structure of a rich environment formed by several groups of galaxies (15) within ~ 7 Mpc from the group center and with ± 1000 km s-1. Conclusions. RX J075243.6+455653 is a group of galaxies that has not yet completed the process of its mass assembly. This new mass accretion will change the fossil state of the group. This group is an example of a galaxy aggregation selected by a large magnitude gap but still in the process of the accretion of its mass.

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6

GORDANIĆ, JELICA. « IMPROVING THE UNITED NATIONS GENERAL ASSEMBLY’S WORKING METHODS AS A POSSIBILITY OF ENDING ITS MARGINALIZATION ». Kultura polisa, n^o 45 (3 juillet 2021) : 61–72. http://dx.doi.org/10.51738/kpolisa2021.18.2r.1.04.

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The paper analyses improving the United Nations General Assembly’s working methods as one of the possibilities of ending its marginalization. The General Assembly is facing numerous difficulties, including an overburdened agenda, repetitive agenda items, the need for better working organization and non-implementation of resolutions by the member states. Among the UN member states there is consent to improve the General Assembly’s working methods, but also disagreements on mechanisms it can be achieved. In order to strengthen the role and competencies of the General Assembly, an ad hoc working group on the revitalization of the work of the General Assembly (the AHWG) was established in 1991. So far, the AHWG group had made some contributions in improving the General Assembly’s working methods. The paper aims to show that efforts of the AHWG, although significant, are not sufficient to solve all problems of working methods of the General Assembly. The author concludes that the only effective way in solving the working methods of the General Assembly is the UN Charter revision.

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Pigatto, Luisa, Nha Il-Seong, Jürgen Hamel, Kevin Johnson, Rajesh Kochhar, Tsuko Nakamura, Nha Il-Seong et al. « DIVISION XII / COMMISSION 41 / WORKING GROUP HISTORICAL INSTRUMENTS ». Proceedings of the International Astronomical Union 3, T26B (décembre 2007) : 228–29. http://dx.doi.org/10.1017/s174392130802423x.

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The Working Group Historical Instruments (WG-HI) was founded by the members of Commission 41 at the 2000 Manchester IAU XXIV General Assembly, with the main objectives to assemble a bibliography of existing publications relating to such instruments, and to encourage colleagues to carry out research and publish their results. Membership of the WG-HI has increased from three to nine people since its foundation. This clearly demonstrates the IAU members increasing interest in safeguarding old astronomical instruments and buildings as witness to their own country's cultural heritage and scientific progress.

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8

Woodson, Sarah A. « Structure and assembly of group I introns ». Current Opinion in Structural Biology 15, n^o 3 (juin 2005) : 324–30. http://dx.doi.org/10.1016/j.sbi.2005.05.007.

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9

Hashiba, Satoru, et Tien-Chien Chang. « PCB assembly setup reduction using group technology ». Computers & ; Industrial Engineering 21, n^o 1-4 (janvier 1991) : 453–57. http://dx.doi.org/10.1016/0360-8352(91)90134-r.

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10

Shilyaev, Sergey, Evgeniy Slashchev, Igor Voyachek et Rinat Shaikhov. « Rational reduction of work in progress when assembling parts of a product using the group interchangeability method ». MATEC Web of Conferences 329 (2020) : 03016. http://dx.doi.org/10.1051/matecconf/202032903016.

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The article discusses the method for interchangeability method. To reduce the volume of work in progress, the design of a fixed combined compensator is developed, which provides stepwise regulation. The article reducing the work in progress by stepwise regulation in multilink dimension chains when assembled using the group proposes a rational technology for the use of combined compensator, taking into account the peculiarities of the group interchangeability method. In order to reduce the work in progress during assembly using the group interchangeability method, two ways of using the combined compensator have been developed: 1 - the inclusion of a compensator in each dimensional chain collected by the group interchangeability method; 2-application of the compensator only at the stage of formation of work in progress during group assembly by replacing one of the parts with it. The peculiarity of the methods is the use of the informational advantage of group assembly — information about the actual dimensions necessary for sorting parts into groups. This eliminates the step of measuring the closing link during assembly and simplifies the design of the compensator, reducing the number of control steps.

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11

Zhang, Xin, et David Mendonça. « Predicting Group Decisions Based on Group Information Seeking and Assembly Behavior ». Proceedings of the Human Factors and Ergonomics Society Annual Meeting 59, n^o 1 (septembre 2015) : 642–46. http://dx.doi.org/10.1177/1541931215591140.

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Frost, Ray L., L. Duong et W. Martens. « Molecular assembly in secondary minerals - Raman spectroscopy of the arthurite group species arthurite and whitmoreite ». Neues Jahrbuch für Mineralogie - Monatshefte 2003, n^o 5 (12 mai 2003) : 223–40. http://dx.doi.org/10.1127/0028-3649/2003/2003-0223.

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Ekers, R. D., I. Appenzeller, H. R. Butcher, N. S. Kardashev, J. Lequeux, J. L. Linsky, F. Pacini et al. « Working Group on Future Large Scale Facilities in Astronomy : (Groupe de Travail Pour les Futures Grandes Infrastructures) ». Transactions of the International Astronomical Union 24, n^o 1 (2000) : 444–46. http://dx.doi.org/10.1017/s0251107x00003461.

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The idea for a Working Group (WG) on “Future Large Scale Facilities in Astronomy” grew from the Joint Discussion on this topic held on 20 August 1994, during the IAU General Assembly in The Hague. The IAU Executive Committee approved its formation in August, 1995, and Harvey Butcher was chair until the XXIIIrd General Assembly in Kyoto in 1997.

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Osman, Safiani, Danakorn Nincarean Eh Phon, Nurul Aswa Omar, Mohd Rustam Mohd Rameli, Najua Syuhada Ahmad Alhassora et Taufik Gusman. « Using Augmented Reality Application to Reduce Time Completion and Error Rate in PC Assembly ». JOIV : International Journal on Informatics Visualization 4, n^o 3 (30 septembre 2020) : 166. http://dx.doi.org/10.30630/joiv.4.3.245.

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In the present context of globalization, the demand for assembly skill has increased and play an essential role in today’s industry. The traditional assembly instruction, face-to-face and manual instruction, may contain unimportant information that can result in misinterpretation, which in turn may increase the number of error and takes longer time to complete the task. A new technology (AR) claims to increase the efficiency of assembly task by directly visualizing computer generated 3D information in the real environment. Therefore, this study aims to determine the impact of AR on the time of task completion and the number of error made during the assembly task. The comparative user study was quantitative involving 18 users divided into either AR group or traditional group performing a pc assembly task. Statistical analysis revealed that the time of completion and error rate for two different group is statistically significant. The findings showed that the use of AR application has resulted in decreasing the number of error made and shorten the time to complete the task than the traditional instructional manual in assemble a pc. Considering these result, it can conclude that augmented reality application is an effective and beneficial tool to be applied in assembly and education.

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Orchiston, Wayne, Kenneth I. Kellermann, Rodney D. Davies, Suzanne V. Débarbat, Masaki Morimoto, Slava Slysh, Govind Swarup, Hugo van Woerden, Jasper V. Wall et Richard Wielebinski. « INTER-DIVISION IV-V-IX / WORKING GROUP HISTORIC RADIO ASTRONOMY ». Proceedings of the International Astronomical Union 4, T27A (décembre 2008) : 344–45. http://dx.doi.org/10.1017/s1743921308025829.

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The Working Group was formed at the IAU XXV General Assembly in Sydney, 2003, as a joint initiative of Commissions 40 Radio Astronomy and Commission 41 History of Astronomy, in order to assemble a master list of surviving historically-significant radio telescopes and associated instrumentation found worldwide, and document the technical specifications and scientific achievements of these instruments. In addition, it would maintain an on-going bibliography of publications on the history of radio astronomy, and monitor other developments relating to the history of radio astronomy (including the deaths of pioneering radio astronomers).

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Peck, Robert H., Jon Timmis et Andy M. Tyrrell. « Self-Assembly and Self-Repair during Motion with Modular Robots ». Electronics 11, n^o 10 (17 mai 2022) : 1595. http://dx.doi.org/10.3390/electronics11101595.

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Self-reconfigurable modular robots consist of multiple modular elements and have the potential to enable future autonomous systems to adapt themselves to handle unstructured environments, novel tasks, or damage to their constituent elements. This paper considers methods of self-assembly, bringing together robotic modules to form larger organism-like structures, and self-repair, removing and replacing faulty modules damaged by internal events or environmental phenomena, which allow group tasks for the multi-robot organism to continue to progress while assembly and repair take place. We show that such “in motion” strategies can successfully assemble and repair a range of structures. Previously developed self-assembly and self-repair strategies have required group tasks to be halted before they could begin. This paper finds that self-assembly and self-repair methods able to operate during group tasks can enable faster completion of the task than previous strategies, and provide reliability benefits in some circumstances. The practicality of these new methods is shown with physical hardware demonstrations. These results show the feasibility of assembling and repairing modular robots whilst other tasks are in progress.

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Sirakaya, Mustafa, et Ebru Kilic Cakmak. « Effects of Augmented Reality on Student Achievement and Self-Efficacy in Vocational Education and Training ». International Journal for Research in Vocational Education and Training 5, n^o 1 (26 avril 2018) : 1–18. http://dx.doi.org/10.13152/ijrvet.5.1.1.

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This study aimed to test the impact of augmented reality (AR) use on student achievement and self-efficacy in vocational education and training. For this purpose, a marker-based AR application, called HardwareAR, was developed. HardwareAR provides information about characteristics of hardware components, ports and assembly. The research design was quasi experimental with pre-test post-test that included a control group. The study was conducted with 46 undergraduate students in the Computer Hardware Course. Computer hardware course achievement test, motherboard assembly self-efficacy questionnaire and unstructured observation form were used in the study for data collection purposes. The control group learned the theoretical and applied information about motherboard assembly by using their textbooks (print material) while students in the experimental group used HardwareAR application for the same purpose. It was found that the use of AR had a positive impact on student achievement in motherboard assembly whereas it had no impact on students’ self-efficacy related to theoretical knowledge and assembly skills. On the other hand use of AR helped learners to complete the assembly process in a shorter time with less support. It is concluded that compared to control group students, experimental group students were more successful in computer hardware courses. This result shows that AR application can be effective in increasing achievement. It was concluded that AR application had no effect on students’ motherboard assembly theoretical knowledge self-efficacy and motherboard assembly skills self-efficacy. This result may have been affected from the fact that students had high levels of theoretical knowledge and assembly skills before the implementation. Observations showed that AR application enabled students to assemble motherboard in a shorter time with less support. It is thought that simultaneous interaction between virtual objects and real world provided by the AR application is effective in reducing assembly time. The students who were able to see the process steps and instructions directly with the help of HardwareAR application could complete the assembly by getting less help. Considering these results, it can be argued that, thanks to simultaneous interaction it provides, AR offers an important alternative for topics that need learner application and practice.

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Hillebrandt, Wolfgang, et Brian Schmidt. « The Supernova Working Group ». Proceedings of the International Astronomical Union 1, T26A (décembre 2005) : 299–302. http://dx.doi.org/10.1017/s174392130600473x.

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AbstractThe Supernova Working Group (SNWG) was re-established at the General Assembly in Sidney on July 21, 2003, sponsored by Commissions 28 (Galaxies) and 47 (Cosmology). Here we report on some of its activities since 2003.

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Aksnes, K., M. E. Davies, C. de Bergh, M. Ya Marov, B. G. Marsden, P. Moore, T. C. Owen et al. « Working Group on Planetary System Nomenclature (Wgpsn) : (Groupe de Travail Pour la Nomenclature du Systeme Planetaire) ». Transactions of the International Astronomical Union 24, n^o 1 (2000) : 439–41. http://dx.doi.org/10.1017/s0251107x00003448.

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Since July 1996, 815 new names on features on bodies in the Solar System have been assigned by the WGPSN and approved at the IAU General Assembly in Kyoto in 1997. Of these names, 666 were for Venus, 17 for Mars, 3 for the Moon, 125 for the Galilean satellites, 3 for the Uranian satellite Miranda, and 1 for the minor planet Ida. 71 additional names mostly on Venus have been selected and have been given or are awaiting provisional approval by the IAU Executive Committee (EC). These names are up for final approval at the next IAU General Assembly.

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Funk, Johannes, et Ludger Schmidt. « Evaluation of an Augmented Reality Instruction for a Complex Assembly Task ». i-com 20, n^o 1 (1 avril 2021) : 63–72. http://dx.doi.org/10.1515/icom-2021-0005.

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Abstract This study compares the use of a marker-based AR instruction with a paper instruction commonly used in manual assembly. Hypotheses were tested as to whether the instruction type affects assembly time, number of errors, usability, and employee strain. Instead of student participants and artificial assembly tasks (e. g. Lego assemblies), the study was conducted with 16 trainees in a real workplace for the assembly of emergency door release handles in rail vehicles. Five assembly runs were performed. Assembly times and assembly errors were determined from recorded videos. Usability (SUS) and strain (NASA-TLX) were recorded with questionnaires. After a slower assembly at the beginning, the AR group assembled significantly faster in the fifth run. The comparable number of errors, usability and strain make marker-based AR applications interesting for knowledge transfer in manual assembly, especially due to the easy entrance and low costs.

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van der Meer, Robert, et Mairi Gudim. « The role of group working in assembly organization ». International Journal of Operations & ; Production Management 16, n^o 2 (février 1996) : 119–40. http://dx.doi.org/10.1108/01443579610109884.

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CARMON, TALI F., ODED Z. MAIMON et EZEY M. DAR-EL. « Group set-up for printed circuit board assembly ». International Journal of Production Research 27, n^o 10 (octobre 1989) : 1795–810. http://dx.doi.org/10.1080/00207548908942655.

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Mejillano, M. R., et R. H. Himes. « Assembly properties of tubulin after carboxyl group modification. » Journal of Biological Chemistry 266, n^o 1 (janvier 1991) : 657–64. http://dx.doi.org/10.1016/s0021-9258(18)52485-6.

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Sridhar, Usha, et Sridhar Mandyam. « A Group Utility Maximizer Mechanism for Land Assembly ». Journal of Real Estate Finance and Economics 47, n^o 3 (28 mars 2012) : 466–88. http://dx.doi.org/10.1007/s11146-012-9370-3.

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Steudel, M. « Automatic flexible assembly of an electromechanical timer group ». Assembly Automation 7, n^o 2 (février 1987) : 73–78. http://dx.doi.org/10.1108/eb004211.

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Vanderlinde, Thyago, Eduardo Guimarães Dupim, Nestor O. Nazario-Yepiz et Antonio Bernardo Carvalho. « An Improved Genome Assembly for Drosophila navojoa, the Basal Species in the mojavensis Cluster ». Journal of Heredity 110, n^o 1 (13 novembre 2018) : 118–23. http://dx.doi.org/10.1093/jhered/esy059.

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Abstract Three North American cactophilic Drosophila species, D. mojavensis, D. arizonae, and D. navojoa, are of considerable evolutionary interest owing to the shift from breeding in Opuntia cacti to columnar species. The 3 species form the “mojavensis cluster” of Drosophila. The genome of D. mojavensis was sequenced in 2007 and the genomes of D. navojoa and D. arizonae were sequenced together in 2016 using the same technology (Illumina) and assembly software (AllPaths-LG). Yet, unfortunately, the D. navojoa genome was considerably more fragmented and incomplete than its sister species, rendering it less useful for evolutionary genetic studies. The D. navojoa read dataset does not fully meet the strict insert size required by the assembler used (AllPaths-LG) and this incompatibility might explain its assembly problems. Accordingly, when we re-assembled the genome of D. navojoa with the SPAdes assembler, which does not have the strict AllPaths-LG requirements, we obtained a substantial improvement in all quality indicators such as N50 (from 84 kb to 389 kb) and BUSCO coverage (from 77% to 97%). Here we share a new, improved reference assembly for D. navojoa genome, along with a RNAseq transcriptome. Given the basal relationship of the Opuntia breeding D. navojoa to the columnar breeding D. arizonae and D. mojavensis, the improved assembly and annotation will allow researchers to address a range of questions associated with the genomics of host shifts, chromosomal rearrangements and speciation in this group.

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Lück, Wolfgang, Holger Reich, John Rognes et Marco Varisco. « Assembly maps for topological cyclic homology of group algebras ». Journal für die reine und angewandte Mathematik (Crelles Journal) 2019, n^o 755 (1 octobre 2019) : 247–77. http://dx.doi.org/10.1515/crelle-2017-0023.

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AbstractWe use assembly maps to study \mathbf{TC}(\mathbb{A}[G];p), the topological cyclic homology at a prime p of the group algebra of a discrete group G with coefficients in a connective ring spectrum \mathbb{A}. For any finite group, we prove that the assembly map for the family of cyclic subgroups is an isomorphism on homotopy groups. For infinite groups, we establish pro-isomorphism, (split) injectivity, and rational injectivity results, as well as counterexamples to injectivity and surjectivity. In particular, for hyperbolic groups and for virtually finitely generated abelian groups, we show that the assembly map for the family of virtually cyclic subgroups is injective but in general not surjective.

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Lloyd Evans, Dyfed, et Shailesh Vinay Joshi. « Herbicide targets and detoxification proteins in sugarcane : from gene assembly to structure modelling ». Genome 60, n^o 7 (juillet 2017) : 601–17. http://dx.doi.org/10.1139/gen-2016-0152.

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In a genome context, sugarcane is a classic orphan crop, in that no genome and only very few genes have been assembled. We have devised a novel exome assembly methodology that has allowed us to assemble and characterize 49 genes that serve as herbicide targets, safener interacting proteins, and members of herbicide detoxification pathways within the sugarcane genome. We have structurally modelled the products of each of these genes, as well as determining allelic, genomic, and RNA-Seq based polymorphisms for each gene. This study provides the largest collection of sugarcane structures modelled to date. We demonstrate that sugarcane genes are highly polymorphic, revealing that each genotype is evolving both uniquely and independently. In addition, we present an exome assembly system for orphan crops that can be executed on commodity infrastructure, making exome assembly practical for any group. In terms of knowledge about herbicide modes of action and detoxification, we have advanced sugarcane from a crop where no information about any herbicide-associated gene was available to the situation where sugarcane is now a species with the single largest collection of known and annotated herbicide-associated genes.

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Hillebrandt, Wolfgang, Brian P. Schmidt, Edward Baron, Stefano Benetti, Sergey I. Blinnikov, Sergey I. Blinnikov, David R. Branch et al. « DIVISION VIII / WORKING GROUP SUPERNOVA ». Proceedings of the International Astronomical Union 4, T27A (décembre 2008) : 295–97. http://dx.doi.org/10.1017/s1743921308025726.

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The Supernova Working Group was re-established at the IAU XXV General Assembly in Sydney, 21 July 2003, sponsored by Commissions 28 (Galaxies) and 47 (Cosmology). Here we report on some of its activities since 2005.

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Green, Anne J., Sarah T. Maddison, Johannes Andersen, Olga B. Dluzhnevskaya, Gloria M. Dubner, Andrea K. Dupree, R. Elizabeth Griffin et al. « EXECUTIVE COMMITTEE WORKING GROUP WOMEN IN ASTRONOMY ». Proceedings of the International Astronomical Union 3, T26B (décembre 2007) : 249–50. http://dx.doi.org/10.1017/s1743921308024289.

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The second Women in Astronomy Lunchtime Meeting was held on Monday 21 August 2006, with more than 250 participants. The meeting was hosted by the EC Working Group for Women in Astronomy, established at the 2003 IAU General Assembly, and was attended by the current President, the Presidents-Elect for this and the next General Assembly, the General Secretary and Vice-Presidents, many senior astronomers, as well as students and young astronomers. It was a particular pleasure to welcome and congratulate the incoming President, Dr Catherine Cesarsky, the first woman to hold the position.

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Wakabayashi, Rie, Ayato Higuchi, Hiroki Obayashi, Masahiro Goto et Noriho Kamiya. « pH-Responsive Self-Assembly of Designer Aromatic Peptide Amphiphiles and Enzymatic Post-Modification of Assembled Structures ». International Journal of Molecular Sciences 22, n^o 7 (27 mars 2021) : 3459. http://dx.doi.org/10.3390/ijms22073459.

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Supramolecular fibrous materials in biological systems play important structural and functional roles, and therefore, there is a growing interest in synthetic materials that mimic such fibrils, especially those bearing enzymatic reactivity. In this study, we investigated the self-assembly and enzymatic post-modification of short aromatic peptide amphiphiles (PAs), Fmoc-LnQG (n = 2 or 3), which contain an LQG recognition unit for microbial transglutaminase (MTG). These aromatic PAs self-assemble into fibrous structures via π-π stacking interactions between the Fmoc groups and hydrogen bonds between the peptides. The intermolecular interactions and morphologies of the assemblies were influenced by the solution pH because of the change in the ionization states of the C-terminal carboxy group of the peptides. Moreover, MTG-catalyzed post-modification of a small fluorescent molecule bearing an amine group also showed pH dependency, where the enzymatic reaction rate was increased at higher pH, which may be because of the higher nucleophilicity of the amine group and the electrostatic interaction between MTG and the self-assembled Fmoc-LnQG. Finally, the accumulation of the fluorescent molecule on these assembled materials was directly observed by confocal fluorescence images. Our study provides a method to accumulate functional molecules on supramolecular structures enzymatically with the morphology control.

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Xu, J., X. Zhou, H. Ge et Y. Zhao. « Adhesion of endothelial cells using self-assembly peptides under precise deformation control of tissue-engineered vessels ». Proceedings of the Institution of Mechanical Engineers, Part H : Journal of Engineering in Medicine 221, n^o 8 (1 août 2007) : 833–36. http://dx.doi.org/10.1243/09544119jeim163.

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The objective of this study was to anchor endothelial cells using self-assembly peptides under precise deformation control of tissue-engineered vessels. An acelluarized vascular matrix was used as the control group to examine the function of self-assembly peptides. In the experiment group, the self-assembly peptides were added to the inner surface of tissue-engineered vessels to form a monolayer. Then the endothelial cells were injected into the vascular lumen. A deformation control system was developed which was based on real-time image analysis and feedback control system. After dynamic culture by different deformation (set points 1, 5, and 10 per cent), the endothelial cell densities of experimental and control groups were compared. Both the self-assembly peptides and the extent of deformation affected the endothelial cell density on the inner surface of tissue-engineered vessels. The construct with self-assembly peptides under 5 per cent deformation gained the highest endothelial cell density. It was concluded that the deformation of assembled peptides contributes to the development and adhesion of endothelial cells in the inner surface of tissue-engineered vessels.

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Win, Lai Lai, Faieza Abdul Aziz, Abdul Aziz Hairuddin, Lili Nurliyana Abdullah, Hwa Jen Yap, Hideo Saito et Norhisham Seyajah. « EFFECTIVENESS ON TRAINING METHOD USING VIRTUAL REALITY AND AUGMENTED REALITY APPLICATIONS IN AUTOMOBILE ENGINE ASSEMBLY ». ASEAN Engineering Journal 12, n^o 4 (29 novembre 2022) : 83–88. http://dx.doi.org/10.11113/aej.v12.18009.

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Training and education have become increasingly crucial in obtaining new skills in a variety of fields, especially in assembly and disassembly operations. The main issue in mechanical engineering, particularly in the assembly department, was that automobile engine components assembly was found to be complicated and challenging to assemble using an existing method, where they only rely on a video-based method. The purpose of this paper is to create interactive Virtual Reality (VR) and Augmented Reality (AR) applications that allow users to efficiently assist and complete the assembly tasks. In this work, the authors designed and developed a fully immersive VR application using an HTC Vive headset and two AR applications (marker-less AR application and marker-based AR application) using EPSON MOVERIO BT-300 (AR Smart Glasses). Fourteen engineering students from Universiti Putra Malaysia were selected for the experiment. They were divided into four groups: video-based group, VR-based group, marker-less AR group, and marker-based AR group. They are required to complete all four experiments (video-based experiment, VR-based experiment, marker-less AR experiment, and marker-based AR experiment). The results showed that the marker-less AR application is the best impressive method (37% better), the VR application is the second impressive method (23% better) followed by the marker-based AR application is the third impressive method (3% better) compared to the existing video-based guideline. Therefore, the students favored AR and VR applications rather than the existing method to be used in automobile engine assembly tasks.

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Lin, Cheng-Jian, et Mei-Ling Huang. « Efficient hybrid group search optimizer for assembling printed circuit boards ». Artificial Intelligence for Engineering Design, Analysis and Manufacturing 33, n^o 03 (17 décembre 2018) : 259–74. http://dx.doi.org/10.1017/s0890060418000240.

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AbstractAssembly optimization of printed circuit boards (PCBs) has received considerable research attention because of efforts to improve productivity. Researchers have simplified complexities associated with PCB assembly; however, they have overlooked hardware constraints, such as pick-and-place restrictions and simultaneous pickup restrictions. In this study, a hybrid group search optimizer (HGSO) was proposed. Assembly optimization of PCBs for a multihead placement machine is segmented into three problems: the (1) auto nozzle changer (ANC) assembly problem, (2) nozzle setup problem, and (3) component pick-and-place sequence problem. The proposed HGSO proportionally applies a modified group search optimizer (MGSO), random-key integer programming, and assigned number of nozzles to an ANC to solve the component picking problem and minimize the number of nozzle changes, and the place order is treated as a traveling salesman problem. Nearest neighbor search is used to generate an initial place order, which is then improved using a 2-opt method, where chaos local search and a population manager improve efficiency and population diversity to minimize total assembly time. To evaluate the performance of the proposed HGSO, real-time PCB data from a plant were examined and compared with data obtained by an onsite engineer and from other related studies. The results revealed that the proposed HGSO has the lowest total assembly time, and it can be widely employed in general multihead placement machines.

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Kim, Yoo Jung, Jisu Kang, Myung Gyoon Lee et In Sung Jang. « A Rich Satellite Population of the NGC 4437 Group and Implications of a Magnitude Gap for Galaxy Group Assembly History ». Astrophysical Journal 929, n^o 1 (1 avril 2022) : 36. http://dx.doi.org/10.3847/1538-4357/ac58f3.

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Abstract Both observations and cosmological simulations have recently shown that there is a large scatter in the number of satellites of Milky Way (MW)–like galaxies. In this study, we investigate the relation between the satellite number and galaxy group assembly history using the r-band magnitude gap (Δm 12) between the brightest and second-brightest galaxies as an indicator. From 20 deg2 of the Hyper Suprime-Cam Subaru Strategic Program Wide layer, we identify 17 dwarf satellite candidates around NGC 4437, a spiral galaxy with about one-fourth of the MW stellar mass. We estimate their distances using the surface brightness fluctuation method. Then we confirm five candidates as members of the NGC 4437 group, resulting in a total of seven group members. Combining the NGC 4437 group (with Δm 12 = 2.5 mag) with other groups in the literature, we find a stratification of the satellite number by Δm 12 for a given host stellar mass. The satellite number for the given host stellar mass decreases as Δm 12 increases. The same trend is found in simulated galaxy groups in the TNG50 simulation of the IllustrisTNG project. We also find that the host galaxies in groups with a smaller Δm 12 (like NGC 4437) have assembled their halo mass more recently than those in larger gap groups, and that their stellar-to-halo mass ratios increase as Δm 12 increases. These results show that the large scatter in the satellite number is consistent with a large range of Δm 12, indicating diverse group assembly histories.

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Hughes, James A. « The IAU Working Group on Reference Systems ». Symposium - International Astronomical Union 141 (1990) : 47–50. http://dx.doi.org/10.1017/s0074180900086150.

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The IAU Working Group on Reference Systems (WG) was founded by a Commission Resolution passed at the XXth General Assembly in Baltimore in 1988. Since most, if not all, participants in this meeting are familiar with that resolution, it will not be discussed here. Background material may be found, for example, in Highlights of Astronomy, XX General Assembly (1988, Ed. D. McNally). Particular attention is called to the reports by B. Morando, R. Duncombe and J.A. Hughes (pp. 482-500) which were given as part of the Joint Commission Meeting, Towards Milliarcsecond Accuracy, chaired by P.K. Seidelmann. This short presentation will provide a description of the current state of affairs of the WG, which is chaired by the speaker.

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Yamazaki, Yasunori. « Development and Applications of the SCARA Robot ». Journal of Robotics and Mechatronics 26, n^o 2 (20 avril 2014) : 127–33. http://dx.doi.org/10.20965/jrm.2014.p0127.

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In the 1980s, when the author worked for Seiko Epson Corporation as a wristwatch production engineer, consumer needs had become so diversified that wristwatches had to be assembled on the same automated assembly line in small lots of about 10,000 pieces per month. Most of the robots available in those days were for processing purposes such as spot welding and were not applicable in practical terms to automated assembly lines for wristwatches in precision, speed, ease of use or cost. The prototype SCARA robot developed by the SCARA Study Group led by Dr. Hiroshi Makino, a professor at the Department of Precision Engineering at Yamanashi University, was found to be the most suitable for automated watch assembly lines. We reviewed assembly work procedures and succeeded in limiting the number of simultaneous control axes to four at a maximum and in cutting assembly costs to 60% of those of conventional processing robots. As the term “selective compliance” suggests, SCARA robots possess all of the functions necessary for stable assembly and for precision and speed. Development team members, including the author, made the most use of previous experience in developing dedicated automated assembly machines for in-house use and succeeded in developing practical SCARA robots by creating a robot language based on workers’ voice. In applications of SCARA robots, this paper introduces just two of many possible examples. One is for oiling work on manual assembly lines and the other is the TAF-M mixed-models wristwatch assembly line. In the oiling work application example, SCARA robots used for infinitesimal oiling work on a manual assembly line for small lots of luxury wristwatches have been found to be very cost-effective and useful for training operators and/or programmers for robots. The TAFM application example represents the assembly line built based on the original Seiko-Epson purpose for introducing SCARA robot development, which consists of both robots and of 52 newly developed “assembly robot cells” where most assembly work should be done. An assembly robot cell includes a SCARA robot, a main conveyor, a multiple-parts feeder, an automatic hand changer, an assembly detection unit, etc. At present, one such assembly line automatically assembles more than 100 models of wristwatches. Use of such automated assembly lines has reduced the human workforce by about 40 workers, cut costs by over 60%, and shortened delivery time by about 50%.

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Chen, Zhi, Ming Fang, Xiao-Min Kang, Yin-Ling Hou et Bin Zhao. « Assembly of single molecular magnets from dinuclear to 2D Dy-compounds with significant change of relaxation energy barriers ». Dalton Transactions 45, n^o 1 (2016) : 85–88. http://dx.doi.org/10.1039/c5dt02444g.

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STEUDEL, M. « Fully automatic flexible assembly of an electromechanical timer group ». International Journal of Production Research 25, n^o 7 (juillet 1987) : 1029–44. http://dx.doi.org/10.1080/00207548708919893.

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Dramsi, Shaynoor, Elise Caliot, Isabelle Bonne, Stephanie Guadagnini, Marie-Christine Prevost, Mila Kojadinovic, Lila Lalioui, Claire Poyart et Patrick Trieu-Cuot. « Assembly and role of pili in group B streptococci ». Molecular Microbiology 60, n^o 6 (juin 2006) : 1401–13. http://dx.doi.org/10.1111/j.1365-2958.2006.05190.x.

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Karpowich, N. K., et D. N. Wang. « Assembly and mechanism of a group II ECF transporter ». Proceedings of the National Academy of Sciences 110, n^o 7 (28 janvier 2013) : 2534–39. http://dx.doi.org/10.1073/pnas.1217361110.

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Reid, Marion E. « Intracellular assembly of kell and XK blood group proteins ». Transfusion Medicine Reviews 14, n^o 3 (juillet 2000) : 283–84. http://dx.doi.org/10.1016/s0887-7963(00)80151-0.

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Russo, David, Soohee Lee et Colvin Redman. « Intracellular assembly of Kell and XK blood group proteins ». Biochimica et Biophysica Acta (BBA) - Biomembranes 1461, n^o 1 (novembre 1999) : 10–18. http://dx.doi.org/10.1016/s0005-2736(99)00148-0.

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Vulcani, Benedetta, Kevin Bundy, Claire Lackner, Alexie Leauthaud, Tommaso Treu, Simona Mei, Lodovico Coccato, Jean Paul Kneib, Matthew Auger et Carlo Nipoti. « UNDERSTANDING THE UNIQUE ASSEMBLY HISTORY OF CENTRAL GROUP GALAXIES ». Astrophysical Journal 797, n^o 1 (24 novembre 2014) : 62. http://dx.doi.org/10.1088/0004-637x/797/1/62.

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Jones, Steven D., Randy Powell et Scott Roberts. « Comprehensive measurement to improve assembly-line work group effectiveness ». National Productivity Review 10, n^o 1 (1990) : 45–55. http://dx.doi.org/10.1002/npr.4040100106.

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Darragh Ford, E., C. Laigle, G. Gozaliasl, C. Pichon, J. Devriendt, A. Slyz, S. Arnouts et al. « Group connectivity in COSMOS : a tracer of mass assembly history ». Monthly Notices of the Royal Astronomical Society 489, n^o 4 (13 septembre 2019) : 5695–708. http://dx.doi.org/10.1093/mnras/stz2490.

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ABSTRACT Cosmic filaments are the channel through which galaxy groups assemble their mass. Cosmic connectivity, namely the number of filaments connected to a given group, is therefore expected to be an important ingredient in shaping group properties. The local connectivity is measured in COSMOS around X-ray-detected groups between redshift 0.5 and 1.2. To this end, large-scale filaments are extracted using the accurate photometric redshifts of the COSMOS2015 catalogue in two-dimensional slices of thickness 120 comoving Mpc centred on the group’s redshift. The link between connectivity, group mass, and the properties of the brightest group galaxy (BGG) is investigated. The same measurement is carried out on mocks extracted from the light-cone of the hydrodynamical simulation Horizon-AGN in order to control systematics. More massive groups are on average more connected. At fixed group mass in low-mass groups, BGG mass is slightly enhanced at high connectivity, while in high-mass groups BGG mass is lower at higher connectivity. Groups with a star-forming BGG have on average a lower connectivity at given mass. From the analysis of the Horizon-AGN simulation, we postulate that different connectivities trace different paths of group mass assembly: at high group mass, groups with higher connectivity are more likely to have grown through a recent major merger, which might be in turn the reason for the quenching of the BGG. Future large-field photometric surveys, such as Euclid and LSST, will be able to confirm and extend these results by probing a wider mass range and a larger variety of environment.

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DaValle, Austin, et Salman Azhar. « An Investigation of Mixed Reality Technology for Onsite Construction Assembly ». MATEC Web of Conferences 312 (2020) : 06001. http://dx.doi.org/10.1051/matecconf/202031206001.

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The construction industry often falls short of other industries in terms of innovation; overall productivity within the construction industry has remained nearly flat for fifty years. As such, the industry is frequently exploring new technologies with the potential to increase its work efficiency as well as productivity. Mixed Reality (MR), which allows for the blending of real and virtual worlds, is one such technology that has a capability to improve productivity. The aim of this research study is to test MR’s potential as an onsite assembly tool in construction. The study more specifically determined if holographic BIM models, spatially anchored in 1:1 ratio over active construction sites, could provide trades’ sufficient information to assemble and install their work without using paper plans. A controlled experiment was designed to test if the electrical and plumbing components of a mock-bathroom could be installed only with MR. A total of 5 sub-groups, each consisting of two participants, took part in this experiment and the time is taken by each sub-group (i.e. the MR group) to complete the assembly was recorded. This was then compared with the time taken by a similar number of sub-groups (i.e. the Control group) to complete the same assembly using paper plans only. The analysis indicates that on average the MR group took approximately 9% less time as compared to the Control group. Qualitative analysis via a post-exercise questionnaire found several technological limitations that the MR must overcome before it sees widespread implementation as a tool for guiding construction assembly. The post-exercise questionnaire also gathered participants’ perceptions about MR potential in construction. This paper highlights the benefits and limitations of the MR technology in construction along with recommendations for improvement as well as future research.

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Khan, A., D. Ceglarek et J. Ni. « Sensor Location Optimization for Fault Diagnosis in Multi-Fixture Assembly Systems ». Journal of Manufacturing Science and Engineering 120, n^o 4 (1 novembre 1998) : 781–92. http://dx.doi.org/10.1115/1.2830221.

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The effectiveness of fault diagnosis in assembly is contingent on the effectiveness of the sensor measurement of assembled parts. Using a diagnosability enhancement methodology for a single fixture, a means to achieve an optimal sensor configuration for a multi-fixture assembly of sheet metal parts is proposed. A Hierarchical Group description of the assembly is used to build a State-Transition representation which, with fixture CAD information, is used in multi-level hierarchical optimization to arrive at the optima. A defined Coverage Effectiveness Index quantifies fault isolation performance. The index also serves to evaluate the performance effectiveness of the measurement station location and change in the sensor number. The approach has significant utility in automotive body assembly where system complexity makes the choice of sensor location vital to fault isolation performance. Examples using multi-fixture simulated and industrial automotive body assembly sequences are provided to illustrate the methodology.

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Scholl, Laura, David Pierre, Raga Rajaravivarma, Reginald Lee, Ahmad Faizan, Viswanathan Swaminathan, Kevor TenHuisen, Jeremy L. Gilbert et Jim Nevelos. « Effect of the support systems’ compliance on total hip modular taper seating stability ». Proceedings of the Institution of Mechanical Engineers, Part H : Journal of Engineering in Medicine 232, n^o 9 (septembre 2018) : 862–70. http://dx.doi.org/10.1177/0954411918790282.

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Assembly of a femoral head onto the stem remains non-standardized. The literature shows altering mechanical conditions during seating affects taper strength and lower assembly load may increase fretting corrosion during cyclic tests. This suggests overall performance may be affected by head assembly method. The purpose of this test was to perform bench-top studies to determine influence of peak force magnitude, load rate, and compliance of the system's support structure on initial stability of the taper. Custom manufactured CoCrMo femoral heads and Ti-6Al-4V taper analog samples were assembled with varying peak force magnitudes (2–10.1 kN), load rates (quasi-static vs impaction), and system compliance (rigid vs compliant). A clinically-relevant system compliance design was based off of force data collected during a cadaver impaction study. Tensile loads were then applied to disassemble the taper and quantify initial taper stability. Results indicated that taper stability (assessed by disassembly forces) increased linearly with assembly force and load rate did not have a significant effect on taper stability. When considering system compliance, a 42%–50% larger input energy, dependent on assembly force, was required in the compliant group to achieve a comparable impaction force to the rigid group. Even when this impaction force was achieved, the correlation between the coefficient, defined as distraction force divided by assembly load, was significantly reduced for the compliant test group. The compliant setup was intended to simulate a surgical scenario where patient and surgical factors may influence the resulting compliance. Based on results, surgical procedure and patient variables may have a significant effect on initial taper stability.

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Butcher, H. R. « Working Group on Future Large Scale Facilities in Astronomy ». Transactions of the International Astronomical Union 23, n^o 1 (1997) : 59–60. http://dx.doi.org/10.1017/s0251107x00027772.

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The idea for a Working Group (WG) on “Future Large Scale Facilities in Astronomy” grew from a discussion held on 20 August, 1994, during the IAU General Assembly in The Hague. The IAU Executive Committee approved its formation in August, 1995, and its composition in October, 1995. The WG will remain active at least until the XXIIIrd General Assembly in Kyoto in 1997. Members are: H. Butcher (Chairman), R. Ekers, B. Fort, N. Kardashev, M. Longair, F. Pacini, L. Rodriguez, G. Swarup, Y. Tanaka, H. Tananbaun, and L. Woltjer (ex officio). The WG carries out its work mostly by email and FAX.

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