Relevant bibliographies by topics / Paced assembly / Journal articles
To see the other types of publications on this topic, follow the link: Paced assembly.

Journal articles on the topic 'Paced assembly'

Author: Grafiati
Published: 4 June 2021
Last updated: 4 February 2022

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the top 50 journal articles for your research on the topic 'Paced assembly.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Browse journal articles on a wide variety of disciplines and organise your bibliography correctly.

1

Carrasquillo, Vernnaliz, Thomas J. Armstrong, and S. Jack Hu. "Mixed-Model Assembly Lines and Their Effect on Worker Posture and Recovery Time." Proceedings of the Human Factors and Ergonomics Society Annual Meeting 61, no. 1 (September 2017): 968. http://dx.doi.org/10.1177/1541931213601723.

Full text
Abstract:
Aim: The aim of this study is to describe the relationship between cycle-to-cycle task variations in mixed-model assembly lines and workers’ exposure to poor posture and insufficient recovery time and provide guidelines for mixed-model assembly line (MMAL) design. Background: In the US, 17.6 out of 100,000 manufacturing workers suffer musculoskeletal injuries while conducting tasks in assembly lines which may be paced (e.g. continuously moving) or self-paced (e.g. asynchronous indexing). MMALs produce multiple products in the same line. Pacing must be carefully considered to achieve productivity targets while providing workers sufficient time to complete the tasks and recover. The effect of pacing on worker fatigue and exertions is not well understood. In MMALs, the complexity of completing multiple work methods may increase exposure to these risk factors. These concerns also affect hospital kitchens. While kitchen workers don’t have standardized work cycles, the work tasks (e.g. get, move, put) resemble the cyclic nature of manufacturing plants. Studies have been conducted to describe the effect of cycle-to-cycle task variations on worker posture and recovery time in MMALs (Carrasquillo, Armstrong, and Hu 2011, 2016, 2017). Methods: Three studies were conducted: (1) field observation of continuous moving assembly line - hospital kitchen, continuous moving conveyor; (2) conveyor type, product mix/sequence laboratory experiment - simulated assembly task conducted under 9 conveyor and product mix/sequence configurations; (3) field observation of on demand, self-paced assembly line with varying demand - hospital kitchen where patients placed orders at any time. Workers were video recorded and worker posture and recovery time were assessed. Posture tracking was used in laboratory study (2). Results: The self-paced assembly lines (asynchronous indexing, and manual), provided workers control over their work pace. They reached within the reach envelop more frequently than in the paced, continuous moving conveyor (43% vs. 86% –99%). The workers on the self-paced assembly line had the greatest average recovery time (31.8%), the worker on the continuous moving conveyor had 9.5% and the subjects on the asynchronous indexing conveyor had 0.7% recovery time. Discussion and conclusions: In study (1) increases in variations increased the frequency of workers reaching outside the reach envelope and reduced recovery time. In Study (2), the self-paced, asynchronous indexing mixed-model assembly line was the most effective configuration in reducing the frequency of reaching unnecessarily to complete the job. However, subjects didn’t reduce the pace to recover; instead, they worked continuously. The workers’ pace in the Study (3) assembly line was constrained by the process time. In it, workers, chose to reach outside the reach envelop 14% of the time; less frequently than in Study (1). The process time provided time for recovery. It exceeded 10%, more than in any of the other assembly line configurations. These findings demonstrate that as work variations increase, so does the frequency of reaching while the recovery time is. Self-pacing reduced but did not eliminate awkward postures. Participants reached ahead and completed the assigned tasks before the work objects were within the reach envelope. Ensuring that a minimum work time is maintained for each product type is essential to providing workers with sufficient time for recovery.
APA, Harvard, Vancouver, ISO, and other styles
2

Vairaktarakis, George, and Janice Kim Winch. "Worker Cross-Training in Paced Assembly Lines." Manufacturing & Service Operations Management 1, no. 2 (April 1999): 112–31. http://dx.doi.org/10.1287/msom.1.2.112.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Lin, L., C. G. Drury, and S. W. Kim. "Ergonomics and quality in paced assembly lines." Human Factors and Ergonomics in Manufacturing 11, no. 4 (2001): 377–82. http://dx.doi.org/10.1002/hfm.1020.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Genikomsakis, Konstantinos N., and Vassilios D. Tourassis. "Effective Cycle Time: A Real World Balancing Index for Paced Assembly Lines." Journal of Advanced Computational Intelligence and Intelligent Informatics 14, no. 5 (July 20, 2010): 431–41. http://dx.doi.org/10.20965/jaciii.2010.p0431.

Full text
Abstract:
Assembly Line Balancing (ALB) aims at optimally assigning the work elements required to assemble a product to an ordered sequence of workstations, while satisfying precedence constraints. Notwithstanding the advances and developments in ALB over the years, recent and thorough surveys on this field reveal that only a small percentage of companies employ ALB procedures to configure their assembly lines. This paradox may be attributed, to some extent, to the fact that ALB is addressed mostly under ideal conditions. Despite the time variability inherent in manufacturing tasks, there is a strong research trend towards designing and implementing algorithms that consider ALB on a deterministic basis and focus on the optimality of the proposed task assignments according to existing ALB performance measures. In this paper, the need to assess the performance of the proposed solutions of various algorithms in the literature is corroborated through simulation experiments on a benchmark ALB problem under more realistic conditions. A novel ALB index, namely the Effective Cycle Time, ECT, is proposed to assess the quality of alternative assembly line configurations in paced assembly lines operating under task times variations.
APA, Harvard, Vancouver, ISO, and other styles
5

Uğurdağ, H. Fatih, Ram Rachamadugu, and Christos A. Papachristou. "Designing paced assembly lines with fixed number of stations." European Journal of Operational Research 102, no. 3 (November 1997): 488–501. http://dx.doi.org/10.1016/s0377-2217(96)00248-2.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Tracht, Kirsten, Lars Funke, and Michael Schottmayer. "Online-control of assembly processes in paced production lines." CIRP Annals 64, no. 1 (2015): 395–98. http://dx.doi.org/10.1016/j.cirp.2015.04.112.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

BOLAT, AHMET, and CANDACE A. YANO. "A surrogate objective for utility work in paced assembly lines." Production Planning & Control 3, no. 4 (October 1992): 406–12. http://dx.doi.org/10.1080/09537289208919410.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Bell, Jennifer L., and Leslie A. MacDonald. "Hand Lacerations and Job Design Characteristics in Line-Paced Assembly." Journal of Occupational and Environmental Medicine 45, no. 8 (August 2003): 848–56. http://dx.doi.org/10.1097/01.jom.0000083032.56116.88.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Dolgui, Alexandre, Sergey Kovalev, Mikhail Y. Kovalyov, Sergey Malyutin, and Ameur Soukhal. "Optimal workforce assignment to operations of a paced assembly line." European Journal of Operational Research 264, no. 1 (January 2018): 200–211. http://dx.doi.org/10.1016/j.ejor.2017.06.017.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Sumichrast, Robert T., Keith A. Oxenrider, and Edward R. Clayton. "An Evolutionary Algorithm for Sequencing Production on a Paced Assembly Line." Decision Sciences 31, no. 1 (March 2000): 149–72. http://dx.doi.org/10.1111/j.1540-5915.2000.tb00928.x.

Full text
APA, Harvard, Vancouver, ISO, and other styles
11

Winch, J. K., X. Cai, and G. L. Vairaktarakis. "Cyclic job scheduling in paced assembly lines with cross-trained workers." International Journal of Production Research 45, no. 4 (February 15, 2007): 803–28. http://dx.doi.org/10.1080/00207540600635144.

Full text
APA, Harvard, Vancouver, ISO, and other styles
12

SUMICHRAST‡, R. T., and E. R. CLAYTON. "Evaluating sequences for paced, mixed-model assembly lines with JIT component fabrication." International Journal of Production Research 34, no. 11 (November 1996): 3125–43. http://dx.doi.org/10.1080/00207549608905081.

Full text
APA, Harvard, Vancouver, ISO, and other styles
13

Delorme, Xavier, Alexandre Dolgui, Sergey Kovalev, and Mikhail Y. Kovalyov. "Minimizing the number of workers in a paced mixed-model assembly line." European Journal of Operational Research 272, no. 1 (January 2019): 188–94. http://dx.doi.org/10.1016/j.ejor.2018.05.072.

Full text
APA, Harvard, Vancouver, ISO, and other styles
14

Xu, Xu, Jin Qin, Robert D. Catena, Gert S. Faber, and Jia-Hua Lin. "Effect of aging on inter-joint synergies during machine-paced assembly tasks." Experimental Brain Research 231, no. 2 (September 1, 2013): 249–56. http://dx.doi.org/10.1007/s00221-013-3688-9.

Full text
APA, Harvard, Vancouver, ISO, and other styles
15

Zhao, Xiaobo, Katsuhisa Ohno, and Hon-Shiang Lau. "A balancing problem for mixed model assembly lines with a paced moving conveyor." Naval Research Logistics (NRL) 51, no. 3 (February 9, 2004): 446–64. http://dx.doi.org/10.1002/nav.10116.

Full text
APA, Harvard, Vancouver, ISO, and other styles
16

Schell, Kraig L., and Anthony F. Grasha. "Interactive Effects of Sex and Psychosocial Interventions on Work Pace and Accuracy in a Self-Paced Product-Assembly Task." Perceptual and Motor Skills 93, no. 3 (December 2001): 879–98. http://dx.doi.org/10.2466/pms.2001.93.3.879.

Full text
APA, Harvard, Vancouver, ISO, and other styles
17

Faccio, Maurizio, Mauro Gamberi, and Marco Bortolini. "Hierarchical approach for paced mixed-model assembly line balancing and sequencing with jolly operators." International Journal of Production Research 54, no. 3 (June 29, 2015): 761–77. http://dx.doi.org/10.1080/00207543.2015.1059965.

Full text
APA, Harvard, Vancouver, ISO, and other styles
18

Glenn, William W. L., and Mildred L. Phelps. "Diaphragm Pacing by Electrical Stimulation of the Phrenic Nerve." Neurosurgery 17, no. 6 (December 1, 1985): 974–84. http://dx.doi.org/10.1227/00006123-198512000-00021.

Full text
Abstract:
Abstract Sophisticated techniques for electrical stimulation of excitable tissue to treat neuromuscular disorders rationally have been developed over the past 3 decades. A historical review shows that electricity has been applied to the phrenic nerves to activate the diaphragm for some 200 years. Of the contemporary methods for stimulating the phrenic nerve in cases of ventilatory insufficiency, the authors prefer stimulation of the phrenic nerve in the thorax using a platinum ribbon electrode placed behind the nerve and an attached subcutancously implanted radiofrequency (RF) receiver inductively coupled to an external RF transmitter. Instructions are given for implanting the electrode-receiver assembly, emphasizing atraumatic handling of the phrenic nerve and strict aseptic techniques. Diaphragm pacing is conducted with low frequency electrical stimulation at a slow repetition (respiratory) rate to condition the diaphragm muscle against fatigue and maintain it fatigue-free. Candidates for diaphragm pacing are those with ventilatory insufficiency due to malfunction of the respiratory control center or interruption of the upper motor neurons of the phrenic nerve. In the Yale series, there were 77 patients treated by diaphragm pacing; 63 (82%) started before 1981 and thus were available for follow-up for at least 5 years; 33 (52%) were paced for 5 to 10 years, and 15 (24%) were paced for 10 to 16. Long term stimulation of the phrenic nerves to pace the diaphragm is an effective method of ventilatory support in selected cases
APA, Harvard, Vancouver, ISO, and other styles
19

Agethen, Philipp, Michael Otto, Stefan Mengel, and Enrico Rukzio. "Using Marker-less Motion Capture Systems for Walk Path Analysis in Paced Assembly Flow Lines." Procedia CIRP 54 (2016): 152–57. http://dx.doi.org/10.1016/j.procir.2016.04.125.

Full text
APA, Harvard, Vancouver, ISO, and other styles
20

BOLAT, AHMET, and CANDACE A. YANO. "Scheduling algorithms to minimize utility work at a single station on a paced assembly line." Production Planning & Control 3, no. 4 (October 1992): 393–405. http://dx.doi.org/10.1080/09537289208919409.

Full text
APA, Harvard, Vancouver, ISO, and other styles
21

Öner-Közen, Miray, Stefan Minner, and Fabian Steinthaler. "Efficiency of paced and unpaced assembly lines under consideration of worker variability – A simulation study." Computers & Industrial Engineering 111 (September 2017): 516–26. http://dx.doi.org/10.1016/j.cie.2017.03.030.

Full text
APA, Harvard, Vancouver, ISO, and other styles
22

Netland, Torbjørn H., Jason D. Schloetzer, and Kasra Ferdows. "Learning lean: rhythm of production and the pace of lean implementation." International Journal of Operations & Production Management 41, no. 2 (January 14, 2021): 131–56. http://dx.doi.org/10.1108/ijopm-02-2020-0092.

Full text
Abstract:
PurposeWhy some assembly factories implement a lean program faster than others is an enduring puzzle. We examine the effect of a fundamental characteristic of every assembly factory—its rhythm of production.Design/methodology/approachWe designed a multi-method study and collected data from a leading global equipment manufacturer that launched a lean program across its factory network. We use quantitative data gathered from internal company documents to test our hypothesis that production rhythm affects the pace of lean implementation. We then analyze qualitative data from interviews and factory visits to derive theoretical explanations for how production rhythm affects lean implementation.FindingsConsistent with our hypothesis, we present evidence that factories with faster production rhythms implement lean faster than those with slower rhythms. This evidence is consistent with learning theories as well as the literature on organizational routines and forms of knowledge. We propose a theory of the relation between rhythm and learning in lean implementation.Research limitations/implicationsThe hitherto unexplored relation between production rhythm and lean implementation raises intriguing questions for scholars and ushers new insights into how organizations learn to implement lean.Practical implicationsOrganizations need to calibrate their expectations for lean implementation pace when their factories have widely different production rhythms and find ways to mitigate any adverse effects slower rhythms may have. Organizations can alleviate the unfavorable context of slower rhythms by inculcating practices in the factory that emulate the learning environment present in faster-paced factories.Originality/valueWe contribute novel quantitative and qualitative evidence that production rhythm affects lean implementation through learning-based mechanisms.
APA, Harvard, Vancouver, ISO, and other styles
23

Zammori, Francesco, Marcello Braglia, and Davide Castellano. "Just-in-time parts feeding policies for paced assembly lines: possible solutions for highly constrained layouts." International Transactions in Operational Research 23, no. 4 (May 5, 2015): 691–724. http://dx.doi.org/10.1111/itor.12173.

Full text
APA, Harvard, Vancouver, ISO, and other styles
24

Johnson, Danny J. "A spreadsheet method for calculating work completion time probability distributions of paced or linked assembly lines." International Journal of Production Research 40, no. 5 (January 2002): 1131–53. http://dx.doi.org/10.1080/00207540110098463.

Full text
APA, Harvard, Vancouver, ISO, and other styles
25

Xu, Xu, Jin Qin, Tao Zhang, and Jia-Hua Lin. "The effect of age on the hand movement time during machine paced assembly tasks for female workers." International Journal of Industrial Ergonomics 44, no. 1 (January 2014): 148–52. http://dx.doi.org/10.1016/j.ergon.2013.11.010.

Full text
APA, Harvard, Vancouver, ISO, and other styles
26

Carrasquillo, Vernnaliz, Thomas J. Armstrong, and S. Jack Hu. "Effect of customer demand in a self-paced mass customization assembly line on worker posture and recovery time." Proceedings of the Human Factors and Ergonomics Society Annual Meeting 60, no. 1 (September 2016): 913. http://dx.doi.org/10.1177/1541931213601209.

Full text
Abstract:
Aims: This study aimed to evaluate worker posture, hand activity level (HAL), and recovery time on workers of a hospital kitchen with an asynchronous indexing assembly line during periods of different customer demand. Background: Workers in hospital kitchens use their hands to prepare and transport food around the kitchen. Unsteady customer demand leads to times when workers are continuously busy with little recovery. These working conditions result in high joint loads and insufficient recovery, causes of work-related musculoskeletal disorders (WMSDs) (NCRC, 2001). Injuries caused by repetitive motion and overexertion are the greatest source of reported injuries (Bureau of Labor and Statistics, 2014). In spite of this, studies have not examined the effect of workplace design, production volume variations, and product complexity and their effect on workers’ exposure to these risk factors. A study at a hospital kitchen mixed-model continuous moving assembly line found that the frequency of reaching increased and the recovery time decreased as variations increased (Carrasquillo, Armstrong, and Hu, 2011). Methods: An observation study was conducted at a hospital kitchen with 2 principal areas: food preparation and tray assembly. High and low demand periods were identified from historical data. Workers were video recorded during each demand period. Videos were used to calculate frequency of reaching and recovery time, and to rate the hand activity level (HAL). Reaches were categorized as: (1) Lower arm, (2) Upper arm, (3) Torso twist/bent. The upper arm and torso twist/bent reaches were further categorized into necessary and unnecessary. Results: HAL – Overall, it increased by 1.2 (from 5 to 6.2) as the demand increased (p < 0.05). Reach - The proportions of unnecessary upper arm and torso reaches were not significantly affected by changes in demand (p > 0.05). Recovery time – Increase in customer demand resulted in a decrease in the proportion of recovery time (p < 0.05). Overall, recovery decreased from 40% to 22%. Discussion and conclusion: Results show that HAL increased as the customer demand increased except for the worker on tray station 2, who had no significant difference between the two periods. This worker was required to wait for meals to be cooked before her job could be completed. This resulted in a greater amount of recovery (37% - 53%). In contrast, the proportion of unnecessary reaches did not change significantly with demand. However, the upper arm and the torso to bend/twist reaches represented more than half of the reaches. While many of them were necessary, >20% were unnecessary. In this assembly line, workers were in control of the pace and recovery time was available more than 10% of the time, factors that reduce workers’ exposure to risk of WMSDs. Although previous studies have found self-paced work increased risk due to decreased recovery (Dempsey, Mathiassen, Jackson, and O’Brian, 2010), this work demonstrated that it might not be the sole factor affecting risk. When products and production time vary and workers must wait for process (cooking), self-pacing appears to provide workers with some control over the frequency of unnecessarily reaching and recovery time.
APA, Harvard, Vancouver, ISO, and other styles
27

Link, Doug, and Michael Kollar. "Improved Design of a High Density 3D Multichip Module for Class I Medical Devices." International Symposium on Microelectronics 2010, no. 1 (January 1, 2010): 000119–26. http://dx.doi.org/10.4071/isom-2010-ta4-paper3.

Full text
Abstract:
Today's powerful DSP based hearing instruments demand both high density and low cost microelectronic packaging solutions. In turn, this demand drives innovation and substantial collaboration among design and manufacturing personnel and suppliers. Conventional design and process envelopes are challenged and new problems arise. Rapid failure analysis and root cause identification are essential in this global, fast-paced development arena. Here we introduce a novel high density multichip module designed for placement onto a flexible, folded hearing aid SMD assembly and discuss the challenges faced by the design team. Delamination, electrochemical migration, and thermal stress failure mechanisms identified during design verification testing are examined, along with the techniques and tools of failure analysis and problem solutions.
APA, Harvard, Vancouver, ISO, and other styles
28

Faber, Andie, Luiz Amaral, and Marcus Maia. "Pronominal Feature Re-assembly: L1 and L2 Pronoun Resolution of Spanish Epicene and Common Gender Antecedents." Studies in Hispanic and Lusophone Linguistics 14, no. 2 (September 1, 2021): 281–320. http://dx.doi.org/10.1515/shll-2021-2046.

Full text
Abstract:
Abstract In this paper, we propose the implementation of a full-fledged feature-based lexicalist syntactic theory as a way to represent the possible configurations of features in the learner’s interlanguage and formalize a theory of acquisition based in feature reassembly. We describe gender agreement pronominal coindexation in Spanish using Head-driven Phrase Structure Grammar (HPSG) and use it to analyze the results of a self-paced reading test with L1 and L2 speakers. We find that the specification of the gender feature value at the syntactic level in epicene antecedents facilitates pronominal resolution in L1 Spanish speakers. Conversely, there is a cognitive cost when the gender feature is underspecified at the syntactic level in common gender antecedents; this cost is not found among L2 speakers. The detailed descriptions in terms of feature specification in the HPSG framework allow us to observe differences between the L1 and L2 grammars in fine-grained detail and represent optionality at the lexical level.
APA, Harvard, Vancouver, ISO, and other styles
29

Carlo, Filippo De, Maria Antonietta Arleo, and Mario Tucci. "OEE Evaluation of a Paced Assembly Line through Different Calculation and Simulation Methods: A Case Study in the Pharmaceutical Environment." International Journal of Engineering Business Management 6 (January 2014): 27. http://dx.doi.org/10.5772/59158.

Full text
APA, Harvard, Vancouver, ISO, and other styles
30

Zhang, Wei, Liang Hou, and Roger J. Jiao. "Dynamic takt time decisions for paced assembly lines balancing and sequencing considering highly mixed-model production: An improved artificial bee colony optimization approach." Computers & Industrial Engineering 161 (November 2021): 107616. http://dx.doi.org/10.1016/j.cie.2021.107616.

Full text
APA, Harvard, Vancouver, ISO, and other styles
31

Tiacci, Lorenzo. "Coupling a genetic algorithm approach and a discrete event simulator to design mixed-model un-paced assembly lines with parallel workstations and stochastic task times." International Journal of Production Economics 159 (January 2015): 319–33. http://dx.doi.org/10.1016/j.ijpe.2014.05.005.

Full text
APA, Harvard, Vancouver, ISO, and other styles
32

Monney, Isaac, Amos Baffoe-Kyeremeh, and Papa Kofi Amissah-Reynolds. "Accelerating rural sanitation coverage in Ghana: what are the speed bumps impeding progress?" Journal of Water, Sanitation and Hygiene for Development 5, no. 4 (August 21, 2015): 531–43. http://dx.doi.org/10.2166/washdev.2015.005.

Full text
Abstract:
Progress towards the Millennium Development Goal (MDG) sanitation target has generally been slow-paced in Ghana. This is particularly the case in rural areas where access to improved sanitation has increased by just 4% within two decades. This paper examines defecation practices as well as constraints and existing opportunities at both household and institutional levels in promoting in-house toilet construction. The study was conducted in three rural communities in the Tain district and drew on key informant interviews, focus group discussions, field observations and face-to-face interviews of 400 residents selected from 249 houses. The results showed the scarcity of in-house toilets, which means consequently open defecation and use of communal toilets are common practices. The need for in-house toilet facilities is high among property owners without them, mainly driven by the desire for comfort and safety. Barriers at the household level constraining latrine installation include ignorance of low-cost technologies, the perceived high cost of latrines and the low priority given to their ownership. Analysis of expenditure patterns at the local assembly shows low priority afforded to sanitation promotion, which is constrained by low donor support, lack of requisite logistics and poor human resource capacity. Existing opportunities for accelerating sanitation coverage in these study communities are examined both at the household and institutional levels, and best practices discussed.
APA, Harvard, Vancouver, ISO, and other styles
33

Wei, J. H., E. A. Hoffman, E. L. Ritman, and E. H. Wood. "Cardiogenic motion of right lung parenchyma in anesthetized intact dogs." Journal of Applied Physiology 58, no. 2 (February 1, 1985): 384–91. http://dx.doi.org/10.1152/jappl.1985.58.2.384.

Full text
Abstract:
Cardiogenic motion of the right lung parenchyma (CGLM) was measured in six morphine-pentobarbital-anesthetized dogs (11–16 kg) under conditions of varying paced and spontaneous sinus heart rates. Motion of 1-mm-diameter percutaneously implanted radiopaque lung parenchymal markers were measured using a computer-based biplane video-roentgenographic assembly. Correlation of the amplitudes and phases of marker motions to the R wave of the electrocardiogram (ECG) were determined utilizing a modified fast Fourier transform algorithm. Of initial importance was the observation that CGLM was significantly greater than the variability of repeated measurements. The total amplitudes of motion of the markers (where AT = square root A2X + A2Y + A2Z and AX, AY, AZ are the amplitudes of marker motion along the orthogonal X, Y, and Z body axes) in the right apical, cardiac, and diaphragmatic lobes were 0.025 +/- 0.005 (SE), 0.046 +/- 0.005, and 0.023 +/- 0.025 cm, respectively, (P less than 0.01, cardiac lobe vs. others). The total amplitude of motion observed in the cardiac lobe was equivalent to earlier observations of total amplitude (0.045 +/- 0.004 cm) of marker motion in response to high frequency airway oscillation at a pump stroke volume of 22–26 ml. An analysis of the higher harmonics of marker oscillation suggested that the second harmonic of CGLM is also larger than the variability of our measurements.
APA, Harvard, Vancouver, ISO, and other styles
34

Schur, Florian K. M., Robert A. Dick, Wim J. H. Hagen, Volker M. Vogt, and John A. G. Briggs. "The Structure of Immature Virus-Like Rous Sarcoma Virus Gag Particles Reveals a Structural Role for the p10 Domain in Assembly." Journal of Virology 89, no. 20 (July 29, 2015): 10294–302. http://dx.doi.org/10.1128/jvi.01502-15.

Full text
Abstract:
ABSTRACTThe polyprotein Gag is the primary structural component of retroviruses. Gag consists of independently folded domains connected by flexible linkers. Interactions between the conserved capsid (CA) domains of Gag mediate formation of hexameric protein lattices that drive assembly of immature virus particles. Proteolytic cleavage of Gag by the viral protease (PR) is required for maturation of retroviruses from an immature form into an infectious form. Within the assembled Gag lattices of HIV-1 and Mason-Pfizer monkey virus (M-PMV), the C-terminal domain of CA adopts similar quaternary arrangements, while the N-terminal domain of CA is packed in very different manners. Here, we have used cryo-electron tomography and subtomogram averaging to studyin vitro-assembled, immature virus-like Rous sarcoma virus (RSV) Gag particles and have determined the structure of CA and the surrounding regions to a resolution of ∼8 Å. We found that the C-terminal domain of RSV CA is arranged similarly to HIV-1 and M-PMV, whereas the N-terminal domain of CA adopts a novel arrangement in which the upstream p10 domain folds back into the CA lattice. In this position the cleavage site between CA and p10 appears to be inaccessible to PR. Below CA, an extended density is consistent with the presence of a six-helix bundle formed by the spacer-peptide region. We have also assessed the affect of lattice assembly on proteolytic processing by exogenous PR. The cleavage between p10 and CA is indeed inhibited in the assembled lattice, a finding consistent with structural regulation of proteolytic maturation.IMPORTANCERetroviruses first assemble into immature virus particles, requiring interactions between Gag proteins that form a protein layer under the viral membrane. Subsequently, Gag is cleaved by the viral protease enzyme into separate domains, leading to rearrangement of the virus into its infectious form. It is important to understand how Gag is arranged within immature retroviruses, in order to understand how virus assembly occurs, and how maturation takes place. We used the techniques cryo-electron tomography and subtomogram averaging to obtain a detailed structural picture of the CA domains in immature assembled Rous sarcoma virus Gag particles. We found that part of Gag next to CA, called p10, folds back and interacts with CA when Gag assembles. This arrangement is different from that seen in HIV-1 and Mason-Pfizer monkey virus, illustrating further structural diversity of retroviral structures. The structure provides new information on how the virus assembles and undergoes maturation.
APA, Harvard, Vancouver, ISO, and other styles
35

Brown, Richard J. C., and Dan J. L. Brett. "Electrochemical Study of Biotin-Modified Self-Assembled Monolayers: Recommendations for Robust Preparation." Scientific World JOURNAL 6 (2006): 20–29. http://dx.doi.org/10.1100/tsw.2006.20.

Full text
Abstract:
The development of the underpinning methodology for the production of robust, well-formed, and densely packed biotin-HPDP functionalised gold surfaces, the crucial first step in immobilising bimolecules on surfaces, is described. Self-assembled monolayers (SAMs) with biotin end-groups were prepared on polycrystalline gold surfaces according to a published method. The layers formed were studied using cyclic voltammetry to determine the composition of the layer and its quality. Crystal impedance spectroscopy was also applied as a complimentary indicator of the composition of the layer.For the first time, the effect of assembly time on the properties of the layer was studied along with the composition of the layer and the ability of the precursor molecule to self-assemble by oxidative addition.
APA, Harvard, Vancouver, ISO, and other styles
36

Moronuki, Nobuyuki, Arata Kaneko, and Ken’ichiro Takada. "Patterned Self-Assembly of Fine Particles as a Proposal of Precisely Allocated Cutting-Edge Tool." International Journal of Automation Technology 5, no. 3 (May 5, 2011): 289–93. http://dx.doi.org/10.20965/ijat.2011.p0289.

Full text
Abstract:
This paper discusses fine-particle self-assembly and its potential applications to abrasive tools. Dispensing suspensions containing particles on substrates, packed structures are self-assembled as solvent evaporates. Applying relative motion between the dispenser and substrate produces patterned assembly without the need for a mask. Silica particles 1 µm in size were typically assembled along lines 20 µm-100 µmwide. Diamond particles were also assembled because these also act as the cutting edge of abrasive tools. Assembled particles were transferred to another substrate using ultraviolet curing resin. The particle edge height was aligned at the same level independent of the assemblylayer number - the key to this process.
APA, Harvard, Vancouver, ISO, and other styles
37

Guo, Rui, and Yoshiaki Oka. "ICONE23-1646 CFD ANALYSIS OF COOLANT CHANNEL GEOMETRIES IN A TIGHTLY PACKED FUEL RODS ASSEMBLY." Proceedings of the International Conference on Nuclear Engineering (ICONE) 2015.23 (2015): _ICONE23–1—_ICONE23–1. http://dx.doi.org/10.1299/jsmeicone.2015.23._icone23-1_318.

Full text
APA, Harvard, Vancouver, ISO, and other styles
38

Rice, Edward S., and Richard E. Green. "New Approaches for Genome Assembly and Scaffolding." Annual Review of Animal Biosciences 7, no. 1 (February 15, 2019): 17–40. http://dx.doi.org/10.1146/annurev-animal-020518-115344.

Full text
Abstract:
Affordable, high-throughput DNA sequencing has accelerated the pace of genome assembly over the past decade. Genome assemblies from high-throughput, short-read sequencing, however, are often not as contiguous as the first generation of genome assemblies. Whereas early genome assembly projects were often aided by clone maps or other mapping data, many current assembly projects forego these scaffolding data and only assemble genomes into smaller segments. Recently, new technologies have been invented that allow chromosome-scale assembly at a lower cost and faster speed than traditional methods. Here, we give an overview of the problem of chromosome-scale assembly and traditional methods for tackling this problem. We then review new technologies for chromosome-scale assembly and recent genome projects that used these technologies to create highly contiguous genome assemblies at low cost.
APA, Harvard, Vancouver, ISO, and other styles
39

Gregory, Wayne, and Jan Berkhout. "Reduction in Tree Stand Assembly Errors with Modified Instructions." Proceedings of the Human Factors and Ergonomics Society Annual Meeting 51, no. 18 (October 2007): 1242–45. http://dx.doi.org/10.1177/154193120705101840.

Full text
Abstract:
Naïve subjects performed a direct out-of-the-box assembly and installation sequence for two models of hunters' tree stands. Their actions were timed and monitored in detail using an array of video cameras. After extensive analysis of their assembly errors and interactions with the packaged instructions, two alternative instruction sets were written, one with modified language, the other with additional user-friendly graphic material. Two additional groups of naïve subjects who assembled tree stands packed with these alternative instructions took significantly less time and made significantly fewer errors.
APA, Harvard, Vancouver, ISO, and other styles
40

Kersten, Joshua T., and Nathan B. Fethke. "Radio frequency identification to measure the duration of machine-paced assembly tasks: Agreement with self-reported task duration and application in variance components analyses of upper arm postures and movements recorded over multiple days." Applied Ergonomics 75 (February 2019): 74–82. http://dx.doi.org/10.1016/j.apergo.2018.09.005.

Full text
APA, Harvard, Vancouver, ISO, and other styles
41

Lombardo, Domenico, Mikhail A. Kiselev, Salvatore Magazù, and Pietro Calandra. "Amphiphiles Self-Assembly: Basic Concepts and Future Perspectives of Supramolecular Approaches." Advances in Condensed Matter Physics 2015 (2015): 1–22. http://dx.doi.org/10.1155/2015/151683.

Full text
Abstract:
Amphiphiles are synthetic or natural molecules with the ability to self-assemble into a wide variety of structures including micelles, vesicles, nanotubes, nanofibers, and lamellae. Self-assembly processes of amphiphiles have been widely used to mimic biological systems, such as assembly of lipids and proteins, while their integrated actions allow the performance of highly specific cellular functions which has paved a way for bottom-up bionanotechnology. While amphiphiles self-assembly has attracted considerable attention for decades due to their extensive applications in material science, drug and gene delivery, recent developments in nanoscience stimulated the combination of the simple approaches of amphiphile assembly with the advanced concept of supramolecular self-assembly for the development of more complex, hierarchical nanostructures. Introduction of stimulus responsive supramolecular amphiphile assembly-disassembly processes provides particularly novel approaches for impacting bionanotechnology applications. Leading examples of these novel self-assembly processes can be found, in fact, in biosystems where assemblies of different amphiphilic macrocomponents and their integrated actions allow the performance of highly specific biological functions. In this perspective, we summarize in this tutorial review the basic concept and recent research on self-assembly of traditional amphiphilic molecules (such as surfactants, amphiphile-like polymers, or lipids) and more recent concepts of supramolecular amphiphiles assembly which have become increasingly important in emerging nanotechnology.
APA, Harvard, Vancouver, ISO, and other styles
42

Passadis, Stamatis, Themistoklis Kabanos, Yu-Fei Song, and Haralampos Miras. "Self-Assembly in Polyoxometalate and Metal Coordination-Based Systems: Synthetic Approaches and Developments." Inorganics 6, no. 3 (July 13, 2018): 71. http://dx.doi.org/10.3390/inorganics6030071.

Full text
Abstract:
Utilizing new experimental approaches and gradual understanding of the underlying chemical processes has led to advances in the self-assembly of inorganic and metal–organic compounds at a very fast pace over the last decades. Exploitation of unveiled information originating from initial experimental observations has sparked the development of new families of compounds with unique structural characteristics and functionalities. The main source of inspiration for numerous research groups originated from the implementation of the design element along with the discovery of new chemical components which can self-assemble into complex structures with wide range of sizes, topologies and functionalities. Not only do self-assembled inorganic and metal–organic chemical systems belong to families of compounds with configurable structures, but also have a vast array of physical properties which reflect the chemical information stored in the various “modular” molecular subunits. The purpose of this short review article is not the exhaustive discussion of the broad field of inorganic and metal–organic chemical systems, but the discussion of some representative examples from each category which demonstrate the implementation of new synthetic approaches and design principles.
APA, Harvard, Vancouver, ISO, and other styles
43

Yang, Yong, Masayuki Nogami, and Arao Nakamura. "Ultrafast Nonlinear Optical Response in Multilayer Silica-Capped Gold Nanoparticle Films." Advanced Materials Research 11-12 (February 2006): 591–94. http://dx.doi.org/10.4028/www.scientific.net/amr.11-12.591.

Full text
Abstract:
Gold nanoparticles were prepared by NaBH4 reduction method, and homogeneous SiO2 were coated on gold nanoparticles and assembled into densely-packed 3-dimensional arrays by the layer-by-layer self-assembly (LBL) technique. Every layer of films exhibited densely packed 2-dimensional arrays of Au@SiO2 composite nanoparticles and the film thickness was controllable through the number of deposition cycles. These multilayer films exhibited high volume fraction of gold nanoparticles (0.047). The imaginary part of the third-order nonlinear optical susceptibility (Imχ(3)) with different deposition layer have been investigated by femtosecond pump and probe spectroscopy. The Imχ(3) value is about (-8.7±3.3)×10-11 esu and almost not dependent with the layer numbers which indicates every layer of our films has the same structural and optical properties.
APA, Harvard, Vancouver, ISO, and other styles
44

Takeda, Iwori, Arata Kaneko, Yasuhiro Tanaka, and Nobuyuki Moronuki. "Selective Cell-Adhesion on Micro-Structured Fine Particles." Key Engineering Materials 516 (June 2012): 130–35. http://dx.doi.org/10.4028/www.scientific.net/kem.516.130.

Full text
Abstract:
The present paper describes spatially selective adhesion of rat phenochromocytoma (PC12) cells on micro-structured fine particles. The particles are packed hexagonally in two-dimensional arrangements by self-assembly. Incubation allows most cells to be successfully adhered to the region of self-assembled particles, while few cells are found on the rest of the glass substrate. The line-and-space structure of particles aligns the cells in straight lines. The desired location of cells can be obtained for both appropriate line width and space of particles, because they dominate a spatial selectivity of cell adhesion.
APA, Harvard, Vancouver, ISO, and other styles
45

Suprenant, K. A., and J. C. Marsh. "Temperature and pH govern the self-assembly of microtubules from unfertilized sea-urchin egg extracts." Journal of Cell Science 87, no. 1 (February 1, 1987): 71–84. http://dx.doi.org/10.1242/jcs.87.1.71.

Full text
Abstract:
A new method for microtubule purification from unfertilized sea-urchin eggs was developed in order to obtain large quantities of calcium- and cold-labile microtubules that contained microtubule-associated components important for mitosis. By taking into consideration the pH, ionic composition of egg cytoplasm, and the physiological temperature for growth of the Pacific coast sea-urchin Strongylocentrotus purpuratus, methods were developed for the assembly of intact microtubules directly from unfertilized egg extracts. The microtubules obtained by cycles of temperature-dependent assembly and disassembly are composed of tubulin and abundant microtubule-associated proteins. These microtubules are cold- and calcium-labile and assemble at a critical protein concentration of 0.11 mg ml-1 at 24 degrees C. The yield of microtubule protein obtained by this new method is equivalent to that obtained with taxol (6–8 mg/20 ml packed eggs). Microtubules that have been fixed and prepared for electron microscopy are decorated with large, globular projections that are attached to the microtubule by thin stalks.
APA, Harvard, Vancouver, ISO, and other styles
46

Allen, Darnel J., Wayne E. Archibald, John A. Harper, John C. Saputo, and Daniel Torres. "Density Functional Investigation of the Inclusion of Gold Clusters on a CH3S Self-Assembled Lattice on Au(111)." Advances in Chemistry 2016 (October 17, 2016): 1–8. http://dx.doi.org/10.1155/2016/6080343.

Full text
Abstract:
We employ first-principles density functional theoretical calculations to address the inclusion of gold (Au) clusters in a well-packed CH3S self-assembled lattice. We compute CH3S adsorption energies to quantify the energetic stability of the self-assembly and gold adsorption and dissolution energies to characterize the structural stability of a series of Au clusters adsorbed at the SAM-Au interface. Our results indicate that the inclusion of Au clusters with less than four Au atoms in the SAM-Au interface enhances the binding of CH3S species. In contrast, larger Au clusters destabilize the self-assembly. We attribute this effect to the low-coordinated gold atoms in the cluster. For small clusters, these low-coordinated sites have significantly different electronic properties compared to larger islands, which makes the binding with the self-assembly energetically more favorable. Our results further indicate that Au clusters in the SAM-Au interface are thermodynamically unstable and they will tend to dissolve, producing Au adatoms incorporated in the self-assembly in the form of CH3S-Au-SCH3 species. This is due to the strong S-Au bond which stabilizes single Au adatoms in the self-assembly. Our results provide solid insight into the impact of adatom islands at the CH3S-Au interface.
APA, Harvard, Vancouver, ISO, and other styles
47

Jing, Jia Jia, Qing You Liu, Hai Yan Zhu, and Liu Yang Wang. "The Research on Deformation Analysis of Rigid Packed Hole Assembly Dynamic Model in 3D Borehole." Advanced Materials Research 189-193 (February 2011): 541–44. http://dx.doi.org/10.4028/www.scientific.net/amr.189-193.541.

Full text
Abstract:
This paper uses cellular element method to propose a new calculating method for drill string dynamic model, and applies the calculating method on rigid packed hole assembly model. The results show that, this method has advantages of programming simply, applying boundary condition easily and rapid convergence rate. It is a new method for rigid packed hole assembly optimization design.
APA, Harvard, Vancouver, ISO, and other styles
48

Short, Ben. "Spindle assembly at a BRISC pace." Journal of Cell Biology 210, no. 2 (July 20, 2015): 172. http://dx.doi.org/10.1083/jcb.2102iti1.

Full text
APA, Harvard, Vancouver, ISO, and other styles
49

Axel, Klein, and Blaine Stothard. "No end in sight: the international drug control system once again baulks at the prospect of reform." Drugs and Alcohol Today 19, no. 3 (August 21, 2019): 164–71. http://dx.doi.org/10.1108/dat-04-2019-0014.

Full text
Abstract:
Purpose In two separate sections the authors summarise the observations, use the insights to reflect on some of the propositions made in the book, and follow the appeal of one of the authors to civil society and academics to “help governments out of the drug policy dilemma that is now facing them”. The paper aims to discuss this issue. Design/methodology/approach The genre the authors follow here is ethnography and the material takes the form of reflective field notes. Since each author follows a particular set of interests the authors split the paper into two sections. There are no strong conclusions, safe that the concerns about the international drug control system were fully borne out by events on the floor. Findings The role of CSOs is critical in moving the process forward – but countries are likely to drift apart as the policy differences are becoming inrreconcilable. Research limitations/implications It is imperative to develop new models of cooperation in the management of psychactive substances. Practical implications This is in recognition that at national level just as much as at Commission on Narcotic Drugs (CND) and UN General Assembly Special Session the increased involvement of CSOs has been pivotal in shifting focus towards public health and human rights. This in turn has encouraged some nations to do the same in their domestic policies – and to stand up and say so in CND meetings. Social implications More involvement of academics and editorial teams in the design of sustainable policies and practices. Originality/value In a critical report on the CND the authors challenge the viability of the international drug control regime in view of the emerging differences between different member states. This is the first attempt in the drug policy literature to assess the durability of the drug control regime as it is faced by the fast paced transformation of cannabis into a recognised medicine and regulated recreational substance. If the appearance of agreement is maintained this is entirely for diplomatic reasons and organisational benefit. In reality, the system is breaking apart and new methods for regulating drugs are emerging.
APA, Harvard, Vancouver, ISO, and other styles
50

Lim, Jong-Min, and Sehee Jeong. "Fabrication of Spherical Titania Inverse Opal Structures Using Electro-Hydrodynamic Atomization." Molecules 24, no. 21 (October 30, 2019): 3905. http://dx.doi.org/10.3390/molecules24213905.

Full text
Abstract:
Spherical PS/HEMA opal structure and spherical titania inverse opal structure were fabricated by self-assembly of colloidal nanoparticles in uniform aerosol droplets generated with electro-hydrodynamic atomization method. When a solution of PS/HEMA nanoparticles with uniform size distribution was used, PS/HEMA nanoparticles self-assembled into a face-centered cubic (FCC) structure by capillary force with the evaporation of the solvent in aerosol droplet, resulting in a spherical opal structure. When PS/HEMA nanoparticles and anatase titania nanoparticles were dispersed simultaneously into the solution, titania nanoparticles with relatively smaller size were assembled at the interstitial site of PS/HEMA nanoparticles packed in the FCC structure, resulting in a spherical opal composite structure. Spherical titania inverse opal structure was fabricated after removing PS/HEMA nanoparticles from the spherical opal composite structure by calcination.
APA, Harvard, Vancouver, ISO, and other styles
We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!

To the bibliography