Relevant bibliographies by topics / Metric thread

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Metric thread'

Author: Grafiati
Published: 4 June 2021
Last updated: 7 February 2022

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Journal articles on the topic "Metric thread"

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Andrii, Dovhopolov, Nekrasov Sergiy, Zhyhylii Dmytro, Savchenko Yevheniy, and Stupin Borys. "Modeling of a Stress-Strain State of Detachable Connection in Details of Reinforced Composite Materials with Cea Method." Strojnícky časopis - Journal of Mechanical Engineering 70, no. 1 (April 1, 2020): 17–28. http://dx.doi.org/10.2478/scjme-2020-0002.

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AbstractIn order to study the strength of the proposed rope threaded joint for machine parts made of reinforced composite materials, a modeling of a stress-strain state was conducted using the software of finite-element analysis LS-DYNA. Stress-strain state modeling was conducted for a rope threaded joint, affecting on the main performance parameters considered to be p – thread pitch (p = 4 mm), and t – thread depth (t = 1 mm). The main thread parameters taken for the model were up to the metric thread М6 (ISO 724:1993) parameters.
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Gorynin, V. I., and A. A. Chizhik. "Stress intensity factor for a metric fastening thread." Strength of Materials 21, no. 3 (March 1989): 318–21. http://dx.doi.org/10.1007/bf01529182.

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Katzwinkel, Tim, Esanula Mohammad, Philipp Silberkuhl, and Manuel Löwer. "THREAD ROLLING REPAIR METHOD FOR 3D PRINTED BOLTS." Proceedings of the Design Society 1 (July 27, 2021): 3141–48. http://dx.doi.org/10.1017/pds.2021.575.

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AbstractWithin this paper, a new method for the quality refinement of external metric standard threads on 3Dprinted bolts is presented. The repair method is based on the application of thread rolling technology, which is applied in terms of cold forming after the regular printing has been finished. The explorative study proves, that the investigated technology has a good potential to solve known precision issues in FDM 3D printing regarding the required accuracy for function fulfilling standardized threads. The application of thread rolling can be done manually and with minimal tool effort, which makes the technology particularly attractive for low cost applications.
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Shchurov, I. A., E. V. Nemitova, A. V. Shchurova, and D. V. Ardashev. "Metric Buttress Thread Milling and Turning on CNC Machines." International Journal of Automotive and Mechanical Engineering 15, no. 2 (June 30, 2018): 5146–60. http://dx.doi.org/10.15282/ijame.15.2.2018.1.0398.

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Gorynin, V. I., and S. Yu Kondrat'ev. "Determination of the stress concentration in a metric thread." Strength of Materials 18, no. 9 (September 1986): 1164–68. http://dx.doi.org/10.1007/bf01522797.

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Lehnhoff, Terry F., and Bradley A. Bunyard. "Bolt Thread and Head Fillet Stress Concentration Factors." Journal of Pressure Vessel Technology 122, no. 2 (March 7, 2000): 180–85. http://dx.doi.org/10.1115/1.556168.

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Linear finite element analysis (FEA) was performed to determine stress concentration factors for the threads and the bolt head fillet in a bolted connection. The FEA models consisted of axisymmetric representations of a bolt and two circular steel plates each 20 mm in thickness. The bolts studied were 8, 12, 16, 20, and 24-mm-dia grade 10.9 metric bolts with the standard M thread profile. The threads were modeled at both the minimum and maximum allowable depths. The fillet between the bolt shank and bolt head connection was modeled at its minimum radius. Each bolt was loaded to its proof strength. A comparison is made to stress concentration factors typically used in bolted connection design. Stress concentration factors in the head fillet were 3.18, 3.23, 3.63, 3.58, and 3.90 for the 8, 12, 16, 20, and 24-mm bolts, respectively. Thread stress concentration factors were highest in the first engaged thread and decreased in each successive thread moving toward the end of the bolt. Stress concentration factors for the shallow thread models ranged from 1.17 to 4.33, 0.87 to 4.32, 0.83 to 4.67, 0.87 to 4.77, and 0.82 to 4.82 for the 8, 12, 16, 20, and 24-mm bolts, respectively. Likewise, stress concentration factors for the deep thread models ranged from 1.18 to 4.80, 0.88 to 4.80, 0.78 to 5.12, 0.83 to 5.17, and 0.82 to 5.22 for the 8, 12, 16, 20, and 24-mm bolts, respectively. [S0094-9930(00)01402-5]
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Slătineanu, Laurenţiu, Oana Dodun, Irina Beşliu Băncescu, Ionel Coman, Adrian Ghionea, and Traian Mihordea. "Theoretical considerations concerning the profile error of the thread flank." MATEC Web of Conferences 178 (2018): 01006. http://dx.doi.org/10.1051/matecconf/201817801006.

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In the case of metric thread, a possible source of the flank error could be the position of the cutting tool edge, which could not intersect the circular cylindrical surface axis. An analytical method of approximation was applied to model the way in which the flank error is generated by considering some geometrical conditions. A theoretical simplified model was determined to highlight the influence of the thread external diameter and of the distance between the circular cylindrical surface axis and the thread rectilinear generatrix on the profile error of thread flank.
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Mutambi, Joshua, and Li-jun Yu. "Application of digital image analysis method in metric screw thread metrology." Journal of Shanghai University (English Edition) 8, no. 2 (June 2004): 208–12. http://dx.doi.org/10.1007/s11741-004-0042-2.

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Novoselac, Stipica, Todor Ergić, Dražan Kozak, and Aleksandar Sedmak. "Influence of Semi-Circular Cracks on Threaded Connection Fatigue by Means of Kitagawa-Takahashi Diagram and El Haddad Equation." Key Engineering Materials 665 (September 2015): 133–36. http://dx.doi.org/10.4028/www.scientific.net/kem.665.133.

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Evaluation of semi-circular surface crack influence on threaded connection fatigue behavior, made of 42CrMo4 heat treatable steel, was carried out. Crack diameters were defined as 0.02, 0.05, 0.1, and 0.15 mm. Influence of semi-circular surface cracks was investigated by means of Kitagawa–Takahashi diagram and El Haddad equation. Assessments were done for survival probability of 99% on detailed FE model with normal metric thread profile and preload force at 70% of force at bolt yield point. The most critical location on threaded connections usually are thread roots which contain a very high notch effect. In order to accurately consider multiaxial stress field in thread root, multiaxial fatigue stress criterion based on a critical plane theory for fatigue assessment, was used. Mean stress influence was taken into account by means of Haigh diagram. Variable amplitude loading history of low-high (Lo-Hi) sequence spectrum was analyzed with the numerical algorithm of Rainflow cycle counting in the time domain. Fatigue damage was calculated according to the modified Palmgren-Miner linear damage accumulation hypothesis.
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Liao, Yunn Shiuan, and Chin Nan Chen. "A Study of a Strategy for Threading Titanium Alloy." Advanced Materials Research 753-755 (August 2013): 323–32. http://dx.doi.org/10.4028/www.scientific.net/amr.753-755.323.

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The cutting of precision threads is an important manufacturing process. Several passes are needed to complete the cutting of a thread and the choice of appropriate cutting speed and depth of cut for each cutting pass is essential. The cutting efficiency and tool life are significantly affected by these two parameters, especially when cutting threads in difficult-to-cut materials, such as titanium alloy. This paper proposes the concept of an equal undeformed chip area for all cutting passes, in order to determine the depth of cut for each pass. The principal goal is to maintain the same cutting force throughout the cutting process. Using tool geometry, the relationship between the cumulative depth of cut and the undeformed chip area for each cutting pass are derived. The depth of cut of each corresponding cutting pass can be determined, once the dimensions of the thread and the number of cutting passes are specified. Experiments were conducted to cut an ISO metric screw thread, with a pitch of 0.5 mm, on a 40 mm in diameter bar. It was found that, for the same total number of cutting passes, the tool wear was less than that suggested by the tool makers, when a depth of cut for each pass was determined using the proposed method. The thread could be cut using a higher cutting speed, resulting in a much shorter machining time. In addition, the proposed strategy also allowed completion of cutting using less cutting passes. A 25% increase in efficiency was noted for the specific thread used in the experiment.
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Dissertations / Theses on the topic "Metric thread"

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Šubr, Jiří. "Porovnání RT vlastností 8-bitových a 32-bitových implementací jádra uC/OS-II." Master's thesis, Vysoké učení technické v Brně. Fakulta informačních technologií, 2013. http://www.nusl.cz/ntk/nusl-236389.

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This thesis concerns of benchmarking $\mu$C/OS-II systems on different microcontroller architectures. The thesis describes COS-II microcontroller core and possible series of benchmark tests which can be used. Selected tests are implemented and measured properties of microcontrollers with different architecture are compared.
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Hlavinka, Miloslav. "Rekonstrukce protitlakové parní turbiny." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-231818.

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Tématem diplomové práce je revize parní turbíny Mitsubishi a výpočet utahovacích momentů šroubů dělící roviny. Tato práce je rozdělena do několika částí. Úvodní část práce obsahuje seznámení s rozsahem prováděných servisních prací na parních turbínách. Poté je zde samotná revize parní turbíny Mitsubishi. Tato revize je dělena podle jednotlivých komponent turbíny. Poté je zde stanoven seznam nutných oprav a také seznam doporučených oprav pro příští odstávku. V další části je zde shrnut výpočet utěsnění dělicích rovin a to s nebo bez odlehčení. Dále jsou rozebrány nejčastěji používané typy závitů spojovacího materiálu parních turbín. Hlavní částí práce je samotný výpočet utahovacího momentu. Výstupem této práce je poté program pro výpočet utahovacího momentu v programu Excel.
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Lorenc, Ján. "Porovnání vlastností a výkonnosti jader uC/OS-II a uC/OS-III." Master's thesis, Vysoké učení technické v Brně. Fakulta informačních technologií, 2016. http://www.nusl.cz/ntk/nusl-255364.

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This master's thesis is focused on benchmarking of Real-Time Operating Systems uC/OS-II and uC/OS-III . It describes the basic features of these systems and metrics used for benchmarking of Real-Time Operating Systems. Selected test methods are implemented and based on them are then compared the performance of Real-Time Operating Systems uC/OS-II and uC/OS-III .
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Zhong, Huang. "3D metric reconstruction from uncalibrated circular motion image sequences." Click to view the E-thesis via HKUTO, 2006. http://sunzi.lib.hku.hk/hkuto/record/B37043791.

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Zhong, Huang, and 鐘煌. "3D metric reconstruction from uncalibrated circular motion image sequences." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2006. http://hub.hku.hk/bib/B37043791.

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Farhady, Ghalaty Nahid. "Fault Attacks on Cryptosystems: Novel Threat Models, Countermeasures and Evaluation Metrics." Diss., Virginia Tech, 2016. http://hdl.handle.net/10919/72280.

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Recent research has demonstrated that there is no sharp distinction between passive attacks based on side-channel leakage and active attacks based on fault injection. Fault behavior can be processed as side-channel information, offering all the benefits of Differential Power Analysis including noise averaging and hypothesis testing by correlation. In fault attacks, the adversary induces faults into a device while it is executing a known program and observes the reaction. The abnormal reactions of the device are later analyzed to obtain the secrets of the program under execution. Fault attacks are a powerful threat. They are used to break cryptosystems, Pay TVs, smart cards and other embedded applications. In fault attack resistant design, the fault is assumed to be induced by a smart, malicious, determined attacker who has high knowledge of the design under attack. Moreover, the purpose of fault attack resistant design is for the system to work correctly under intentional fault injection without leaking any secret data information. Towards building a fault attack resistant design, the problem can be categorized into three main subjects: begin{itemize} item Investigating novel and more powerful threat models and attack procedures. item Proposing countermeasures to build secure systems against fault attacks item Building evaluation metrics to measure the security of designs end{itemize} In this regard, my thesis has covered the first bullet, by proposing the Differential Fault Intensity Analysis (DFIA) based on the biased fault model. The biased fault model in this attack means the gradual behavior of the fault as a cause of increasing the intensity of fault injection. The DFIA attack has been successfully launched on AES, PRESENT and LED block ciphers. Our group has also recently proposed this attack on the AES algorithm running on a LEON3 processor. In our work, we also propose a countermeasure against one of the most powerful types of fault attacks, namely, Fault Sensitivity Analysis (FSA). This countermeasure is based on balancing the delay of the circuit to destroy the correlation of secret data and timing delay of a circuit. Additionally, we propose a framework for assessing the vulnerability of designs against fault attacks. An example of this framework is the Timing Violation Vulnerability Factor (TVVF) that is a metric for measuring the vulnerability of hardware against timing violation attacks. We compute TVVF for two implementations of AES algorithm and measure the vulnerability of these designs against two types of fault attacks. %For future work, we plan to propose an attack that is a combination of power measurements and fault injections. This attack is more powerful in the sense that it has less fault injection restrictions and requires less amount of information from the block cipher's data. We also plan to design more efficient and generic evaluation metrics than TVVF. As shown in this thesis, fault attacks are more serious threat than considered by the cryptography community. This thesis provides a deep understanding of the fault behavior in the circuit and therefore a better knowledge on powerful fault attacks. The techniques developed in this dissertation focus on different aspects of fault attacks on hardware architectures and microprocessors. Considering the proposed fault models, attacks, and evaluation metrics in this thesis, there is hope to develop robust and fault attack resistant microprocessors. We conclude this thesis by observing future areas and opportunities for research.
Ph. D.
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Yee, Darrick. "A Three-Study Examination of Test-Based Accountability Metrics." Thesis, Harvard University, 2017. http://nrs.harvard.edu/urn-3:HUL.InstRepos:33052855.

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Recent state and federal policy initiatives have led to the development of a multitude of statistics intended to measure school performance. Of these, statistics constructed from student test scores number among both the most widely-used and most controversial. In many cases, researchers and policymakers alike are not fully aware of the ways in which these statistics may lead to unjustified inferences regarding school effectiveness. A substantial amount of recent research has attempted to remedy this, although much remains unknown. This thesis seeks to contribute to these research efforts via three papers, each examining how a commonly-employed accountability statistic may be influenced by factors unrelated to student proficiency or school effectiveness. The first paper demonstrates how the discrete nature of test scores leads to biased estimates of changes in the percentage of “proficient” students between any two given years and examines estimators that provide better recovery of this parameter. The second paper makes use of a state-wide natural experiment to show that a change in testing program, from paper-and-pencil to computer-adaptive, may cause apparent changes in achievement gaps even when relative student proficiencies have remained constant. The third paper examines “growth-based” accountability metrics based on vertically-scaled assessments, showing that certain types of metrics based on gain scores can be modeled via nonlinear transformations of the underlying vertical scale. It then makes use of this result to investigate the potential magnitude of impacts of such transformations on growth-based school accountability ratings.
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Yu, Ying. "Visual Appearances of the Metric Shapes of Three-Dimensional Objects: Variation and Constancy." The Ohio State University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=osu1592254922173432.

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Nia, Ramadianti Putri Mganga, and Medard Charles. "Enhancing Information Security in Cloud Computing Services using SLA based metrics." Thesis, Blekinge Tekniska Högskola, Sektionen för datavetenskap och kommunikation, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-1999.

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Context: Cloud computing is a prospering technology that most organizations are considering for adoption as a cost effective strategy for managing IT. However, organizations also still consider the technology to be associated with many business risks that are not yet resolved. Such issues include security, privacy as well as legal and regulatory risks. As an initiative to address such risks, organizations can develop and implement SLA to establish common expectations and goals between the cloud provider and customer. Organizations can base on the SLA to measure the achievement of the outsourced service. However, many SLAs tend to focus on cloud computing performance whilst neglecting information security issues. Objective: We identify threats and security attributes applicable in cloud computing. We also select a framework suitable for identifying information security metrics. Moreover, we identify SLA based information security metrics in the cloud in line with the COBIT framework. Methods: We conducted a systematic literature review (SLR) to identify studies focusing on information security threats in the cloud computing. We also used SLR to select frameworks available for identification of security metrics. We used Engineering Village and Scopus online citation databases as primary sources of data for SLR. Studies were selected based on the inclusion/exclusion criteria we defined. A suitable framework was selected based on defined framework selection criteria. Based on the selected framework and conceptual review of the COBIT framework we identified SLA based information security metrics in the cloud. Results: Based on the SLR we identified security threats and attributes in the cloud. The Goal Question Metric (GQM) framework was selected as a framework suitable for identification of security metrics. Following the GQM approach and the COBIT framework we identified ten areas that are essential and related with information security in the cloud computing. In addition, covering the ten essential areas we identified 41 SLA based information security metrics that are relevant for measuring and monitoring security performance of cloud computing services. Conclusions: Cloud computing faces similar threats as traditional computing. Depending on the service and deployment model adopted, addressing security risks in the cloud may become a more challenging and complex undertaking. This situation therefore appeals to the cloud providers the need to execute their key responsibilities of creating not only a cost effective but also a secure cloud computing service. In this study, we assist both cloud provider and customers on the security issues that are to be considered for inclusion in their SLA. We have identified 41 SLA based information security metrics to aid both cloud providers and customers obtain common security performance expectations and goals. We anticipate that adoption of these metrics can help cloud providers in enhancing security in the cloud environment. The metrics will also assist cloud customers in evaluating security performance of the cloud for improvements.
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Zhu, Mingying. "The Human Impacts of Air Pollution: Three Studies Using Internet Metrics." Thesis, Université d'Ottawa / University of Ottawa, 2019. http://hdl.handle.net/10393/39404.

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Chapter 1: We provide first evidence of a link from daily air pollution exposure to sleep loss in a panel of Chinese cities. We develop a social media-based, city-level metric for sleeplessness, and bolster causal claims by instrumenting for pollution with plausibly exogenous variations in wind patterns. Estimates of effect sizes are substantial and robust. In our preferred specification, a one standard deviation increase in AQI causes an 11.6% increase in sleeplessness. The results sustain qualitatively under OLS estimation but are attenuated. The analysis provides a previously unaccounted-for benefit of more stringent air quality regulation. It also offers a candidate mechanism in support of recent research that links daily air quality to diminished workplace productivity, cognitive performance, school absence, traffic accidents, and other detrimental outcomes. Chapter 2: We provide linear and non-parametric estimates of the causal impact of short-term exposure to polluted air on the prevalence of cough in a panel of a hundred Chinese cities. In our central estimate, which exploits plausibly-exogenous variations in the number of agricultural fires burning in the vicinity as an instrument, we find that a one standard deviation increase in airborne pollution causes a roughly 5% increase in the prevalence of cough in the affected city. Amongst pollutants the effect can be tied specifically to particulate matter (PM2.5). The results prove resilient in a series of robustness tests and falsification exercises. Chapter 3: We provide the first study of the relationship between air pollution and students' migration intentions for higher education. Young people's interest in local study is proxied by their Baidu search index for local universities. The IV method is supplemented to identify the causal link by instrumenting for particular matter with plausibly exogenous variations in temperature inversion strength. The estimates of effect sizes are substantial and robust. When air quality in Beijing moves from good-day level to moderately-polluted level, people's search for local education decreases by 3.8% under OLS and 11.8% under IV. The results release the signal that people lost their interest in local universities due to the elevated air pollution. There could be future out-migration to cleaner cities for higher education.
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Books on the topic "Metric thread"

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Improving metrics for the Department of Defense Cooperative Threat Reduction Program. Washington, D.C: National Academies Press, 2012.

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Argyriou, Vasileios. Image, video & 3D data registration: Medical, satellite and video processing applications with quality metrics. Hoboken: Wiley, 2015.

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Nintendo Strategies. Lincolnwood, IL: Publications International, Ltd., 1989.

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Inc, Game Counselor. Game Counselor's Answer Book for Nintendo Players. Redmond, USA: Microsoft Pr, 1991.

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Silberstein, Michael, W. M. Stuckey, and Timothy McDevitt. Resolving Puzzles, Problems, and Paradoxes from General Relativity. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198807087.003.0004.

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The main thread of chapter 3 introduces general relativity (GR), Big Bang cosmology, and closed timelike curves, showing how the ant’s-eye view leads to the puzzle of the creation of the universe, the horizon problem, the flatness problem, the low entropy problem, and the paradoxes of closed time-like curves. All these puzzles, problems, and paradoxes of the dynamical universe are resolved using the God’s-eye view of the adynamical block universe. Accordingly, Einstein’s equations of GR are not understood dynamically, but rather adynamically, that is, as a global self-consistency constraint between the spacetime metric and stress–energy tensor throughout the spacetime manifold. This is “spatiotemporal ontological contextuality” as applied to GR. The philosophical nuances such as the status of the block universe argument in GR and debates about the Past Hypothesis have been placed in Philosophy of Physics for Chapter 3. The associated formalism and computations are in Foundational Physics for Chapter 3.
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Improving Metrics for the Department of Defense Cooperative Threat Reduction Program. Washington, D.C.: National Academies Press, 2012. http://dx.doi.org/10.17226/13289.

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Roche, Alexis, Vasileios Argyriou, Jesus Martinez Del Rincon, and Barbara Villarini. Image, Video and 3D Data Registration: Medical, Satellite and Video Processing Applications with Quality Metrics. Wiley & Sons, Incorporated, John, 2015.

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Roche, Alexis, Vasileios Argyriou, Jesus Martinez Del Rincon, and Barbara Villarini. Image, Video and 3D Data Registration: Medical, Satellite and Video Processing Applications with Quality Metrics. Wiley & Sons, Incorporated, John, 2015.

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Test for Evaluating the Torque-Tension Relationship of Both External and Internal Metric Threaded Fasteners (Sae/Uscar-10 December 1998). Society of Automotive Engineers Inc, 1998.

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Wildman, Wesley J. Anthropomorphism and Apophaticism. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780198815990.003.0002.

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To appreciate the risks and benefits of anthropomorphism, it is important (1) to appreciate the genius and limitations of human cognition, (2) to compare ultimacy models to see what difference anthropomorphic modeling techniques make, and (3) to entertain the possibility of an apophatic approach to ultimate reality that relativizes and relates ultimacy models. An apophatic approach to ultimate reality relativizes ultimacy models but also implies a disintegrating metric that serves to relate ultimacy models to one another. Degree of anthropomorphism is an important component of this disintegrating metric. Comparative analysis helps manifest internal complexity in the idea of anthropomorphism by distinguishing three relatively independent dimensions: Intentionality Attribution, Rational Practicality, and Narrative Comprehensibility. Educational efforts stabilized in cultural traditions can confer on people the desire and ability to resist one or more dimensions of the anthropomorphic default modes of cognition to some degree.
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Book chapters on the topic "Metric thread"

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Calì, Michele, Salvatore Massimo Oliveri, and Marco Evangelos Biancolini. "Thread Couplings Stress Analysis by Radial Basis Functions Mesh Morphing." In Lecture Notes in Mechanical Engineering, 114–20. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-70566-4_19.

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AbstractTraditional analytical methods are approximate and need to be validated when it comes to predict the tensional behavior of thread coupling. Numerical finite element simulations help engineers come up with the optimum design, although the latter depends on the constraints and load conditions of the thread couplings which are often variable during the system functioning. The present work illustrates a new method based on Radial Basis Functions Mesh Morphing formulation to optimize the stress concentration in thread couplings which is subject to variable loads and constraints. In particular, thread root and fillet under-head drawings for metric ISO thread, which are the most commonly used thread connection, are optimized with Radial Basis Functions Mesh Morphing. In metric ISO threaded connection, the root shape and the fillet under the head are circular, and from shape optimization for minimum stress concentration it is well known that the circular shape becomes seldom optimal. The study is carried out to enhance the stress concentration factor with a simple geometric parameterization using two design variables. Radial Basis Functions Mesh Morphing formulation, performed with a simple geometric parameterization, has allowed to obtain a stress reduction of up to 12%; some similarities are found in the optimized designs leading to the proposal of a new standard. The reductions in the stress are achieved by rather simple changes made to the cutting tool.
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Foias, C., A. E. Frazho, I. Gohberg, and M. A. Kaashoek. "Applications of the Three Chains Completion Theorem to Interpolation." In Metric Constrained Interpolation, Commutant Lifting and Systems, 469–95. Basel: Birkhäuser Basel, 1998. http://dx.doi.org/10.1007/978-3-0348-8791-5_14.

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Breugel, Franck. "Three metric domains of processes for bisimulation." In Lecture Notes in Computer Science, 103–21. Berlin, Heidelberg: Springer Berlin Heidelberg, 1994. http://dx.doi.org/10.1007/3-540-58027-1_5.

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Foias, C., A. E. Frazho, I. Gohberg, and M. A. Kaashoek. "Parameterization of All Solutions of the Three Chains Completion Problem." In Metric Constrained Interpolation, Commutant Lifting and Systems, 497–532. Basel: Birkhäuser Basel, 1998. http://dx.doi.org/10.1007/978-3-0348-8791-5_15.

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Wang, Chi-Yuen, and Michael Manga. "Epilogue." In Lecture Notes in Earth System Sciences, 369–79. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-64308-9_14.

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AbstractWe identify some common threads and trends in the observations of hydrological responses to earthquakes. We suggest that seismic energy density is a useful metric for interpreting observations and relating different types of responses. We conclude with a summary of outstanding questions and new opportunities.
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Costa, Luís Henrique M. K., Serge Fdida, and Otto Carlos M. B. Duarte. "Distance-Vector QoS-Based Routing with Three Metrics." In Networking 2000 Broadband Communications, High Performance Networking, and Performance of Communication Networks, 847–58. Berlin, Heidelberg: Springer Berlin Heidelberg, 2000. http://dx.doi.org/10.1007/3-540-45551-5_71.

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Chern, Shiing-Shen, and R. S. Hamilton. "On Riemannian Metrics Adapted to Three-Dimensional Contact Manifolds." In Springer Collected Works in Mathematics, 105–34. New York, NY: Springer New York, 1989. http://dx.doi.org/10.1007/978-1-4614-9451-5_11.

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Chern, S. S., and R. S. Hamilton. "On Riemannian Metrics Adapted to Three-Dimensional Contact Manifolds." In Selected Papers, 105–34. New York, NY: Springer New York, 1989. http://dx.doi.org/10.1007/978-1-4612-3548-4_11.

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Goldberg, S. I., D. Perrone, and G. Toth. "Curvature of contact Riemannian three-manifolds with critical metrics." In Lecture Notes in Mathematics, 212–22. Berlin, Heidelberg: Springer Berlin Heidelberg, 1989. http://dx.doi.org/10.1007/bfb0086424.

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Chern, S. S., and R. S. Hamilton. "On riemannian metrics adapted to three-dimensional contact manifolds." In Lecture Notes in Mathematics, 279–308. Berlin, Heidelberg: Springer Berlin Heidelberg, 1985. http://dx.doi.org/10.1007/bfb0084596.

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Conference papers on the topic "Metric thread"

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Senthilnathan, R., M. Nandhini, R. Ranjani, and S. Sridevi. "Vision based orientation invariant measurement of metric screw thread parameters." In 2017 Trends in Industrial Measurement and Automation (TIMA). IEEE, 2017. http://dx.doi.org/10.1109/tima.2017.8064811.

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Kukielka, Krzysztof, Pawel Kaldunski, Leon Kukielka, Agnieszka Kulakowska, and Radoslaw Patyk. "Prediction of the metric thread quality after axial thread rolling process on cold using of finite element methods." In COMPUTATIONAL TECHNOLOGIES IN ENGINEERING (TKI’2018): Proceedings of the 15th Conference on Computational Technologies in Engineering. Author(s), 2019. http://dx.doi.org/10.1063/1.5092079.

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Munn, Brian S., and Keyu Li. "Investigation Into the Effect of Thread Root Condition on the High Cycle Fatigue Performance of a Metric Threaded Fastener." In ASME 2010 Pressure Vessels and Piping Division/K-PVP Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/pvp2010-25227.

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This paper presents an experimental investigation into the effect of thread root condition on the high cycle fatigue behavior of a tightened M12 metric fastener under a fully reversed, cyclic load. Two conditions were mechanically created at the fastener thread root. The first had an elastic condition with no localized plastic straining, and the second had localized plastic straining at the thread root. The elastic or plastic condition at the thread root was created by tightening the metric fastener into a fabricated steel joint at several different input or tightening torque levels prior to the application of a fully, reversed cyclic load. The fully reversed cyclic load was applied and a staircase methodology used in accordance to International Standard (ISO) 3800:1993(E). Fatigue results were also evaluated in conformance with (ISO) 3800:1993(E) to determine fatigue strengths at five million cycles. All fatigue tests were run at a rate of 50 Hz under a simple, sinusoidal wave form until either failure (rupture) or five-million cycles was attained and the test suspended. The fatigue strength values were then plotted on a graph of applied stress amplitude versus nominal mean stress level commonly referred to as a Modified Goodman diagram for bolted joints. The plotted fatigue strength data was not linear but displayed a knee or a bend. This knee or bend represents a transition point in the fatigue behavior of the threaded fastener. To describe the fatigue behavior, a bi-linear model has been applied. This bi-linear model is based on the local condition at the thread root. The knee represents a transition in condition from elastic to plastic behavior at the thread root. The result of this study shows that fastener fatigue behavior was influenced by the condition at the thread root.
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Kohli, Harpreet, Dale Lindskog, Pavol Zavarsky, and Ron Ruhl. "An Enhanced Threat Identification Approach for Collusion Threats." In 2011 Third International Workshop on Security Measurements and Metrics (Metrisec). IEEE, 2011. http://dx.doi.org/10.1109/metrisec.2011.11.

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Alkelani, Ali, and Basil Housari. "Development of Tightening Torque for Self Tapping and Thread Rolling Fasteners." In ASME 2011 Pressure Vessels and Piping Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/pvp2011-57132.

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Torque is the most common tightening strategy used to control clamp load when bolts are tightened, since a direct relationship between torque and clamp load exists. For unified and metric fasteners used in non-critical applications, there are torque tables available in the literature that provide a guideline as to what torque level is recommended to be used based on fastener size, thread pitch, and material class. For critical applications, the tightening specification is usually developed based on individual cases. For self tapping and thread rolling screws, the tabulated torque values available for machine threaded screws cannot be used. If the torque spec is not developed carefully for such joints then problems such as stripping the threads or torqueing out before seating the screw may be encountered. This is mainly due to the fact that these types of screws are very sensitive to many variables, such as thread type, hole size, coating, joint surface finish, tapped material thickness, and other factors. For such fasteners, the torque spec should be developed experimentally based on test data for the actual joint. This paper provides an accurate procedure for developing tightening specifications for joints that use self tapping and thread rolling screws. Additionally, it provides a criterion to determine whether the joint design is robust enough for assembly or not.
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Zlobin, A. V., S. E. Tarasevich, and A. V. Shishkin. "Heat transfer during boiling in pipes with uniform continuous wall roughness in the form of a metric thread and twisted tape insert." In THE 1ST INTERNATIONAL CONFERENCE ON PHYSICS AND APPLIED PHYSICS (THE 1ST ICP&AP) 2019: Fundamental and Innovative Research for Improving Competitive Dignified Nation and Industrial Revolution 4.0. AIP Publishing, 2020. http://dx.doi.org/10.1063/5.0002869.

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Kumar Sundaram, Suresh, and Raghu V. Prakash. "Effect of Loading Condition on Stress Intensity Factor for Threaded Fasteners Under Helix Angle Condition." In ASME 2015 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/imece2015-50315.

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The effect of loading condition on the stress intensity factor (SIF) solution for a metric threaded bolt with helix angle consideration is investigated. Available SIF solutions for a nut loaded bolt do not consider the effect of helix angle of thread. Various loading conditions such as: (i) far field loading, (ii) thread face loading without helix angle, (iii) thread face loading with helix angle and (iv) nut loading with helix angle are considered in the present study. 3-D contact analysis is carried out to observe the stress distribution between the bolt and nut interface. A crack was introduced at the first thread of the bolt so that the crack faces experience opening mode of fracture under nut loading condition. The SIF estimated by each loading condition was compared with the SIF values computed taking into consideration the nut loading with helix angle. SIF solutions obtained under far field loading condition are lower than those obtained under other loading conditions at short crack depths (a/d = 0.1); at deep crack depths (a/d = 0.5), SIF obtained under nut loading condition are lower than those obtained under other loading conditions. At deep crack depths (a/d = 0.5) the effect of loading condition on SIF is more pronounced for an elliptic crack (a/c = 0.2) than semi circular crack (a/c = 1). Due to the combined effect of mode II and mode III fracture which is caused by helix angle, non symmetric distribution of SIF was observed along the crack front. It is noted that, crack growth rate derived from SIF under nut loading condition is lower than published data at the middle region (P/P0 = 0).
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Ahmed, Faez, Sharath Kumar Ramachandran, Mark Fuge, Sam Hunter, and Scarlett Miller. "Measuring and Optimizing Design Variety Using Herfindahl Index." In ASME 2019 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/detc2019-97778.

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Abstract In this paper, we propose a new design variety metric based on the Herfindahl index. We also propose a practical procedure for comparing variety metrics via the construction of ground truth datasets from pairwise comparisons by experts. Using two new datasets, we show that this new variety measure aligns with human ratings more than some existing and commonly used tree-based metrics. This metric also has three main advantages over existing metrics: a) It is a super-modular function, which enables us to optimize design variety using a polynomial time greedy algorithm. b) The parametric nature of this metric allows us to fit the metric to better represent variety for new domains. c) It has higher sensitivity in distinguishing between variety of sets of randomly selected designs than existing methods. Overall, our results shed light on some qualities that good design variety metrics should possess and the non-trivial challenges associated with collecting the data needed to measure those qualities.
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Venkataramanujam, Venkatesh, and Pierre Larochelle. "A Displacement Metric for Finite Sets of Rigid Body Displacements." In ASME 2008 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2008. http://dx.doi.org/10.1115/detc2008-49554.

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There are various useful metrics for finding the distance between two points in Euclidean space. Metrics for finding the distance between two rigid body locations in Euclidean space depend on both the coordinate frame and units used. A metric independent of these choices is desirable. This paper presents a metric for a finite set of rigid body displacements. The methodology uses the principal frame (PF) associated with the finite set of displacements and the polar decomposition to map the homogenous transform representation of elements of the special Euclidean group SE(N-1) onto the special orthogonal group SO(N). Once the elements are mapped to SO(N) a bi-invariant metric can then be used. The metric obtained is thus independent of the choice of fixed coordinate frame i.e. it is left invariant. This metric has potential applications in motion synthesis, motion generation and interpolation. Three examples are presented to illustrate the usefulness of this methodology.
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Žefran, Miloš, Vijay Kumar, and Christopher Croke. "Choice of Riemannian Metrics for Rigid Body Kinematics." In ASME 1996 Design Engineering Technical Conferences and Computers in Engineering Conference. American Society of Mechanical Engineers, 1996. http://dx.doi.org/10.1115/96-detc/mech-1148.

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Abstract The set of spatial rigid body motions forms a Lie group known as the special Euclidean group in three dimensions, SE(3). Chasles’s theorem states that there exists a screw motion between two arbitrary elements of SE(3). In this paper we investigate whether there exist a Riemannian metric whose geodesics are screw motions. We prove that no Riemannian metric with such geodesics exists and we show that the metrics whose geodesics are screw motions form a two-parameter family of semi-Riemannian metrics.
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Reports on the topic "Metric thread"

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Frye, Jason Neal, Cynthia K. Veitch, Mark Elliot Mateski, John T. Michalski, James Mark Harris, Cassandra M. Trevino, and Scott Maruoka. Cyber threat metrics. Office of Scientific and Technical Information (OSTI), March 2012. http://dx.doi.org/10.2172/1039394.

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Lippmann, R. P., J. F. Riordan, T. H. Yu, and K. K. Watson. Continuous Security Metrics for Prevalent Network Threats: Introduction and First Four Metrics. Fort Belvoir, VA: Defense Technical Information Center, May 2012. http://dx.doi.org/10.21236/ada565825.

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Lopez, Rafael. On Learning: Metrics Based Systems for Countering Asymmetric Threats. Fort Belvoir, VA: Defense Technical Information Center, May 2006. http://dx.doi.org/10.21236/ada450454.

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Hall, J. Analysis of a Gross Counting Decision Metric for use in Threat Detection During Cargo Container Inspection. Office of Scientific and Technical Information (OSTI), April 2006. http://dx.doi.org/10.2172/889431.

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Wurtz, R., S. Walston, D. Dietrich, and H. Martz. Metrics for Developing an Endorsed Set of Radiographic Threat Surrogates for JINII/CAARS. Office of Scientific and Technical Information (OSTI), February 2009. http://dx.doi.org/10.2172/950070.

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Cohen, Israel Dov, and Wondwosen Mengesha. Anomaly metrics to differentiate threat sources from benign sources in primary vehicle screening. Office of Scientific and Technical Information (OSTI), September 2011. http://dx.doi.org/10.2172/1029822.

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Nakova, Galia. Curvature Properties of Some Three-Dimentional Almost Contact Manifolds with B-Metric II. GIQ, 2012. http://dx.doi.org/10.7546/giq-5-2004-169-177.

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Job, Jacob. Mesa Verde National Park: Acoustic monitoring report. National Park Service, July 2021. http://dx.doi.org/10.36967/nrr-2286703.

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In 2015, the Natural Sounds and Night Skies Division (NSNSD) received a request to collect baseline acoustical data at Mesa Verde National Park (MEVE). Between July and August 2015, as well as February and March 2016, three acoustical monitoring systems were deployed throughout the park, however one site (MEVE002) stopped recording after a couple days during the summer due to wildlife interference. The goal of the study was to establish a baseline soundscape inventory of backcountry and frontcountry sites within the park. This inventory will be used to establish indicators and thresholds of soundscape quality that will support the park and NSNSD in developing a comprehensive approach to protecting the acoustic environment through soundscape management planning. Additionally, results of this study will help the park identify major sources of noise within the park, as well as provide a baseline understanding of the acoustical environment as a whole for use in potential future comparative studies. In this deployment, sound pressure level (SPL) was measured continuously every second by a calibrated sound level meter. Other equipment included an anemometer to collect wind speed and a digital audio recorder collecting continuous recordings to document sound sources. In this document, “sound pressure level” refers to broadband (12.5 Hz–20 kHz), A-weighted, 1-second time averaged sound level (LAeq, 1s), and hereafter referred to as “sound level.” Sound levels are measured on a logarithmic scale relative to the reference sound pressure for atmospheric sources, 20 μPa. The logarithmic scale is a useful way to express the wide range of sound pressures perceived by the human ear. Sound levels are reported in decibels (dB). A-weighting is applied to sound levels in order to account for the response of the human ear (Harris, 1998). To approximate human hearing sensitivity, A-weighting discounts sounds below 1 kHz and above 6 kHz. Trained technicians calculated time audible metrics after monitoring was complete. See Methods section for protocol details, equipment specifications, and metric calculations. Median existing (LA50) and natural ambient (LAnat) metrics are also reported for daytime (7:00–19:00) and nighttime (19:00–7:00). Prominent noise sources at the two backcountry sites (MEVE001 and MEVE002) included vehicles and aircraft, while building and vehicle predominated at the frontcountry site (MEVE003). Table 1 displays time audible values for each of these noise sources during the monitoring period, as well as ambient sound levels. In determining the current conditions of an acoustical environment, it is informative to examine how often sound levels exceed certain values. Table 2 reports the percent of time that measured levels at the three monitoring locations were above four key values.
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Wright, Kirsten. Collecting Plant Phenology Data In Imperiled Oregon White Oak Ecosystems: Analysis and Recommendations for Metro. Portland State University, March 2020. http://dx.doi.org/10.15760/mem.64.

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Highly imperiled Oregon white oak ecosystems are a regional conservation priority of numerous organizations, including Oregon Metro, a regional government serving over one million people in the Portland area. Previously dominant systems in the Pacific Northwest, upland prairie and oak woodlands are now experiencing significant threat, with only 2% remaining in the Willamette Valley in small fragments (Hulse et al. 2002). These fragments are of high conservation value because of the rich biodiversity they support, including rare and endemic species, such as Delphinium leucophaeum (Oregon Department of Agriculture, 2020). Since 2010, Metro scientists and volunteers have collected phenology data on approximately 140 species of forbs and graminoids in regional oak prairie and woodlands. Phenology is the study of life-stage events in plants and animals, such as budbreak and senescence in flowering plants, and widely acknowledged as a sensitive indicator of environmental change (Parmesan 2007). Indeed, shifts in plant phenology have been observed over the last few decades as a result of climate change (Parmesan 2006). In oak systems, these changes have profound implications for plant community composition and diversity, as well as trophic interactions and general ecosystem function (Willis 2008). While the original intent of Metro’s phenology data-collection was to track long-term phenology trends, limitations in data collection methods have made such analysis difficult. Rather, these data are currently used to inform seasonal management decisions on Metro properties, such as when to collect seed for propagation and when to spray herbicide to control invasive species. Metro is now interested in fine-tuning their data-collection methods to better capture long-term phenology trends to guide future conservation strategies. Addressing the regional and global conservation issues of our time will require unprecedented collaboration. Phenology data collected on Metro properties is not only an important asset for Metro’s conservation plan, but holds potential to support broader research on a larger scale. As a leader in urban conservation, Metro is poised to make a meaningful scientific contribution by sharing phenology data with regional and national organizations. Data-sharing will benefit the common goal of conservation and create avenues for collaboration with other scientists and conservation practitioners (Rosemartin 2013). In order to support Metro’s ongoing conservation efforts in Oregon white oak systems, I have implemented a three-part master’s project. Part one of the project examines Metro’s previously collected phenology data, providing descriptive statistics and assessing the strengths and weaknesses of the methods by which the data were collected. Part two makes recommendations for improving future phenology data-collection methods, and includes recommendations for datasharing with regional and national organizations. Part three is a collection of scientific vouchers documenting key plant species in varying phases of phenology for Metro’s teaching herbarium. The purpose of these vouchers is to provide a visual tool for Metro staff and volunteers who rely on plant identification to carry out aspects of their job in plant conservation. Each component of this project addresses specific aspects of Metro’s conservation program, from day-to-day management concerns to long-term scientific inquiry.
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Asenath-Smith, Emily, Emma Ambrogi, Lee Moores, Stephen Newman, and Jonathon Brame. Leveraging chemical actinometry and optical radiometry to reduce uncertainty in photochemical research. Engineer Research and Development Center (U.S.), September 2021. http://dx.doi.org/10.21079/11681/42080.

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Subtle aspects of illumination sources and their characterization methods can introduce significant uncertainty into the data gathered from light-activated experiments, limiting their reproducibility and technology transition. Degradation kinetics of methyl orange (MO) and carbamazepine (CM) under illumination with TiO₂ were used as a case study for investigating the role of incident photon flux on photocatalytic degradation rates. Valerophenone and ferrioxalate actinometry were paired with optical radiometry in three different illumination systems: xenon arc (XE), tungsten halogen (W-H), and UV fluorescent (UV-F). Degradation rate constants for MO and CM varied similarly among the three light systems as k W-H < kiv-F < kXE, implying the same relative photon flux emission by each light. However, the apparent relative photon flux emitted by the different lights varied depending on the light characterization method. This discrepancy is shown to be caused by the spectral distribution present in light emission profiles, as well as absorption behavior of chemical actinometers and optical sensors. Data and calculations for the determination of photon flux from chemical and calibrated optical light characterization is presented, allowing us to interpret photo-degradation rate constants as a function of incident photon flux. This approach enabled the derivation of a calibrated ‘rate-flux’ metric for evaluating and translating data from photocatalysis studies.
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