Relevant bibliographies by topics / Η - circumference of a point

Contents

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

Academic literature on the topic 'Η - circumference of a point'

Author: Grafiati
Published: 5 June 2025
Last updated: 24 June 2025

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

Select a source type:

Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'Η - circumference of a point.'

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.

Journal articles on the topic "Η - circumference of a point"

1

Ducotey, K. S., and J. K. Good. "The Effect of Web Permeability and Side Leakage on the Air Film Height Between a Roller and Web." Journal of Tribology 120, no. 3 (1998): 559–65. http://dx.doi.org/10.1115/1.2834587.

Full text
Abstract:
Air entrained between a web and roller can cause a loss in traction that can affect web quality. The entrained air causes an air layer to form which separates the web from the roller. Insufficient traction exists at this point and an idler roller will be unable to be driven by the web. Other applications, however, such as newsprint moving around a turnbar, require complete clearance. An equation for predicting the air film height between a permeable web and roller was developed using foil bearing theory. The separation distance (h) between the roller and web is a function of the roller radius (R), web tension (T), air viscosity (η), summation of the web and roller velocities (U), and the web permeability (α). The air film height was found to decrease linearly around the circumference (θ) of the roller in the constant pressure region. Therefore, the air film height can be expressed simply as, h=0.643R[(6ηU)/T]2/3−2[(αT)/U]θ The slope of the air film height is a function of the web/roller velocity, web tension, and the permeability of the paper. A correction factor for side leakage was also incorporated into the result.
APA, Harvard, Vancouver, ISO, and other styles
2

Fox, Patrick J., Sergo Jindariani, and Vladimir Shiltsev. "DIMUS: super-compact Dimuonium Spectroscopy collider at Fermilab." Journal of Instrumentation 18, no. 08 (2023): T08007. http://dx.doi.org/10.1088/1748-0221/18/08/t08007.

Full text
Abstract:
Abstract While dimuonium (μ + μ -) — the “smallest QED atom” — has not yet been observed, it is of utmost fundamental interest. By virtue of the larger mass, dimuonium has greater sensitivity to beyond the standard model (BSM) effects than its cousins positronium or muonium, both discovered long ago, while not suffering from large QCD uncertainties. Dimuonium atoms can be created in e + e - collisions with large longitudinal momentum, allowing them to decay a small distance away from the beam crossing point and avoid prompt backgrounds. We envision a unique cost-effective and fast-timeline opportunity for copious production of (μ + μ -) atoms at the production threshold via a modest modification of existing Fermilab Accelerator Science and Technology (FAST) facility to arrange collisions of 408 MeV electrons and positrons at a 75° angle. This compact 23 m circumference collider (DIMUS) will allow for precision tests of QED and open the door for searches for new physics coupled to the muon. The FAST facility is perfectly suited for DIMUS as there are existing SRF accelerators and infrastructure, capable of producing high energy, high current electron and positron beams, sufficient for O(1032)cm2 s-1 luminosity and ∼0.5 million dimuons per year. The expansion will require installation of a second SRF cryomodule, positron production and accumulation system, fast injection/extraction kickers and two small circumference intersecting rings. An approximately meter-sized detector with several layers of modern pixelated silicon detector and crystal-based electromagnetic calorimeters will ensure observation of the decays of dimuonium to electron-positron pairs in presence of the Bhabba scattering background. An expansion of the system to include solenoidal magnet outside of the calorimeter system, a layer of steel shielding behind the magnet, and a set of dedicated muon detectors would extend the physics program of DIMUS to include precision studies of rare processes with muons, pions, and η mesons produced in e + e - collisions.
APA, Harvard, Vancouver, ISO, and other styles
3

Antczak, Tadeusz. "Saddle point criteria and duality in multiobjective programming via an η-approximation method". ANZIAM Journal 47, № 2 (2005): 155–72. http://dx.doi.org/10.1017/s1446181100009962.

Full text
Abstract:
AbstractIn this paper, Antczak's η-approximation approach is used to prove the equivalence between optima of multiobjective programming problems and the η-saddle points of the associated η-approximated vector optimisation problems. We introduce an η-Lagrange function for a constructed η-approximated vector optimisation problem and present some modified η-saddle point results. Furthermore, we construct an η-approximated Mond-Weir dual problem associated with the original dual problem of the considered multiobjective programming problem. Using duality theorems between η-approximation vector optimisation problems and their duals (that is, an η-approximated dual problem), various duality theorems are established for the original multiobjective programming problem and its original Mond-Weir dual problem.
APA, Harvard, Vancouver, ISO, and other styles
4

Jung, Soon-Mo, Ji-Hye Kim, and Young Woo Nam. "Hyers–Ulam Stability of Two-Dimensional Flett’s Mean Value Points." Mathematics 7, no. 8 (2019): 733. http://dx.doi.org/10.3390/math7080733.

Full text
Abstract:
If a differentiable function f : [ a , b ] → R and a point η ∈ [ a , b ] satisfy f ( η ) - f ( a ) = f ′ ( η ) ( η - a ) , then the point η is called a Flett’s mean value point of f in [ a , b ] . The concept of Flett’s mean value points can be generalized to the 2-dimensional Flett’s mean value points as follows: For the different points r ^ and s ^ of R × R , let L be the line segment joining r ^ and s ^ . If a partially differentiable function f : R × R → R and an intermediate point ω ^ ∈ L satisfy f ( ω ^ ) - f ( r ^ ) = ω ^ - r ^ , f ′ ( ω ^ ) , then the point ω ^ is called a 2-dimensional Flett’s mean value point of f in L. In this paper, we will prove the Hyers–Ulam stability of 2-dimensional Flett’s mean value points.
APA, Harvard, Vancouver, ISO, and other styles
5

Hussain, N., M. A. Kutbi та P. Salimi. "Fixed Point Theory inα-Complete Metric Spaces with Applications". Abstract and Applied Analysis 2014 (2014): 1–11. http://dx.doi.org/10.1155/2014/280817.

Full text
Abstract:
The aim of this paper is to introduce new concepts ofα-η-complete metric space andα-η-continuous function and establish fixed point results for modifiedα-η-ψ-rational contraction mappings inα-η-complete metric spaces. As an application, we derive some Suzuki type fixed point theorems and new fixed point theorems forψ-graphic-rational contractions. Moreover, some examples and an application to integral equations are given here to illustrate the usability of the obtained results.
APA, Harvard, Vancouver, ISO, and other styles
6

Baccelli, François, and Eliza O'Reilly. "Reach of repulsion for determinantal point processes in high dimensions." Journal of Applied Probability 55, no. 3 (2018): 760–88. http://dx.doi.org/10.1017/jpr.2018.49.

Full text
Abstract:
Abstract Goldman (2010) proved that the distribution of a stationary determinantal point process (DPP) Φ can be coupled with its reduced Palm version Φ0,! such that there exists a point process η where Φ=Φ0,!∪η in distribution and Φ0,!∩η=∅. The points of η characterize the repulsive nature of a typical point of Φ. In this paper we use the first-moment measure of η to study the repulsive behavior of DPPs in high dimensions. We show that many families of DPPs have the property that the total number of points in η converges in probability to 0 as the space dimension n→∞. We also prove that for some DPPs, there exists an R∗ such that the decay of the first-moment measure of η is slowest in a small annulus around the sphere of radius √nR∗. This R∗ can be interpreted as the asymptotic reach of repulsion of the DPP. Examples of classes of DPP models exhibiting this behavior are presented and an application to high-dimensional Boolean models is given.
APA, Harvard, Vancouver, ISO, and other styles
7

Hussain, N., M. A. Kutbi, S. Khaleghizadeh та P. Salimi. "Discussions on Recent Results forα-ψ-Contractive Mappings". Abstract and Applied Analysis 2014 (2014): 1–13. http://dx.doi.org/10.1155/2014/456482.

Full text
Abstract:
We establish certain fixed point results forα-η-generalized convex contractions,α-η-weakly Zamfirescu mappings, andα-η-Ćirić strong almost contractions. As an application, we derive some Suzuki type fixed point theorems and certain new fixed point theorems in metric spaces endowed with a graph and a partial order. Moreover, we discuss some illustrative examples to highlight the realized improvements.
APA, Harvard, Vancouver, ISO, and other styles
8

Pourhadi, Ehsan, Reza Saadati, and Sotiris K. Ntouyas. "Application of Fixed-Point Theory for a Nonlinear Fractional Three-Point Boundary-Value Problem." Mathematics 7, no. 6 (2019): 526. http://dx.doi.org/10.3390/math7060526.

Full text
Abstract:
Throughout this paper, via the Schauder fixed-point theorem, a generalization of Krasnoselskii’s fixed-point theorem in a cone, as well as some inequalities relevant to Green’s function, we study the existence of positive solutions of a nonlinear, fractional three-point boundary-value problem with a term of the first order derivative ( a C D α x ) ( t ) = f ( t , x ( t ) , x ′ ( t ) ) , a < t < b , 1 < α < 2 , x ( a ) = 0 , x ( b ) = μ x ( η ) , a < η < b , μ > λ , where λ = b − a η − a and a C D α denotes the Caputo’s fractional derivative, and f : [ a , b ] × R × R → R is a continuous function satisfying the certain conditions.
APA, Harvard, Vancouver, ISO, and other styles
9

Sitthiwirattham, Thanin, and Jessada Tariboon. "Positive Solutions to a Generalized Second-Order Difference Equation with Summation Boundary Value Problem." Journal of Applied Mathematics 2012 (2012): 1–15. http://dx.doi.org/10.1155/2012/569313.

Full text
Abstract:
By using Krasnoselskii's fixed point theorem, we study the existence of positive solutions to the three-point summation boundary value problemΔ2u(t-1)+a(t)f(u(t))=0,t∈{1,2,…,T},u(0)=β∑s=1ηu(s),u(T+1)=α∑s=1ηu(s), wherefis continuous,T≥3is a fixed positive integer,η∈{1,2,...,T-1},0<α<(2T+2)/η(η+1),0<β<(2T+2-αη(η+1))/η(2T-η+1),andΔu(t-1)=u(t)-u(t-1). We show the existence of at least one positive solution iffis either superlinear or sublinear.
APA, Harvard, Vancouver, ISO, and other styles
10

Sun, Jian-Ping, Xue-Mei Yang, and Ya-Hong Zhao. "Existence of Positive Solution to System of Nonlinear Third-Order Three-Point BVPs." Journal of Function Spaces 2016 (2016): 1–6. http://dx.doi.org/10.1155/2016/6874643.

Full text
Abstract:
We are concerned with the following system of third-order three-point boundary value problems:u′′′(t)+f(t,v(t))=0,t∈(0,1),v′′′(t)+g(t,u(t))=0,t∈(0,1),u(0)=u′′(0)=0,u′(1)=αu(η),v(0)=v′′(0)=0, andv′(1)=αv(η), where0<η<1and0<α<1/η. By imposing some suitable conditions onfandg, we obtain the existence of at least one positive solution to the above system. The main tool used is the theory of the fixed-point index.
APA, Harvard, Vancouver, ISO, and other styles
More sources

Dissertations / Theses on the topic "Η - circumference of a point"

1

Hsu, Chung-Hau, and 許中華. "An evaluation of the effect of electrical acupuncture point stimulation on simple obsity for waist circumference." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/91977813444956615928.

Full text
Abstract:
碩士<br>中國醫藥學院<br>中西醫結合研究所<br>90<br>Abstract Obesity is a common health problem in developed countries. WHO defined obesity as BMI（Body Mass Index）＞30kg/m2 which should be treat with drugs or other method. Obesity is related to DM, hyperlipidemia and cardiovascular disease which were major disease in Taiwan. Usually acupuncture is effective in treatment of obesity, so it is worth to see if acupuncture could be applied to obesity. The purpose of this study is to evaluate whether electrical acupuncture can improve obesity, life quality and the Chinese symptom. The study is a randomized and positive controlled clinical trial. Studies population came from the clinic of the Chinese medicine in Taipei hospital. The main criteria is BMI（Body Mass Index）＞30kg/m2 . 39 patients were randomly allocated in two groups: 20 in positive controlled group and 19 in electrical acupuncture group. Electrical acupuncture were given twice a week for 40 mins. Positive control were given 10 times local abdominal exercise （仰臥起坐）each day. The whole treatment course is 6 weeks. The evaluation item are BMI, BW, WC（Waist circumference）, HC（Hip）, WHR, Abdominal local fat, Glu, TG, Cho, life quality and Chinese symptomatic scores. There were not a statistically significant difference between positive control and electrical acupuncture after finishing treatment. In group comparison, electrical acupuncture group revealed a statistically significant difference in BMI（p=0.001）, BW（p=0.02）, WC（p<0.001）, LF（p<0.001）, Glu（p=0.014） and Tg（p=0.031）. Besides; electrical acupuncture group has improved tendency in life quality especially in body level（p=0.045） and Chinese symptomatic scores especially in headache（p=0.02 ） and food appetite（p=0.021）. From the point of Chinese symptomatic diagnosis, the most symptomatic groups were chi-vacuity, stomach-heat and phlegm-dampness in our studied patients. Pulse feeling and tongue inspection do not change in both groups. Electrical acupuncture point stimulation or acupuncture point stimulation could be another treatment option for weight control. We hope the detailed, long period evaluated and well-designed studies would be taken in the future.
APA, Harvard, Vancouver, ISO, and other styles
2

Λάμπα, Ευαγγελία. "Ο Sophus Lie και η έννοια της συμμετρίας στις συνήθεις διαφορικές εξισώσεις". Thesis, 2005. http://nemertes.lis.upatras.gr/jspui/handle/10889/905.

Full text
Abstract:
Ο σκοπός της εργασίας είναι η παρουσίαση της έννοιας της συμμετρίας ως έναν μετασχηματισμό που απεικονίζει τη λύση μιας Δ.Ε. σε μια άλλη Δ.Ε. διατηρώντας αναλλοίωτη και αμετάβλητη τη μορφή της. Παρουσιάζεται επίσης η μέθοδος της αναλλοίωτης διαφόρισης και ο αλγόριθμος Lie.<br>-
APA, Harvard, Vancouver, ISO, and other styles

Book chapters on the topic "Η - circumference of a point"

1

Husain, Shamshad, Huma Sahper, and Sanjeev Gupta. "H(., ., .)- $$\eta $$ η -Proximal-Point Mapping with an Application." In Applied Analysis in Biological and Physical Sciences. Springer India, 2016. http://dx.doi.org/10.1007/978-81-322-3640-5_22.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Singh, Yadvendra, and S. K. Mishra. "Saddle Point Criteria for Semi-infinite Programming Problems via an $$\eta $$η-Approximation Method." In Operations Research and Optimization. Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-10-7814-9_2.

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

Lan, Heng-you, Xiao Wang, Tingjian Xiong, and Yumin Xiang. "An Over-Relaxed (A,η,m)-Proximal Point Algorithm for System of Nonlinear Fuzzy-Set Valued Operator Equation Frameworks and Fixed Point Problems." In Lecture Notes in Computer Science. Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-24918-1_16.

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

Matoba, Yuka, Toyoshi Inoguchi, Atsushi Ogo, and Ryoichi Takayanagi. "Waist Circumference for the Clinical Diagnosis of Metabolic Syndrome in the Japanese Population: Optimal Cut-Point to Predict Early Arteriosclerosis." In Handbook of Anthropometry. Springer New York, 2012. http://dx.doi.org/10.1007/978-1-4419-1788-1_120.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Deng, Jiayao, Xiao Hu, Gnauizhi Xu, et al. "The Preparation of Iridium-Based Catalyst with Different Melting Point-Metal Nitrate and Its OER Performance in Acid Media." In Proceedings of the 10th Hydrogen Technology Convention, Volume 1. Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-99-8631-6_6.

Full text
Abstract:
AbstractOxygen evolution reaction (OER) is the main factor limiting the large-scale development of proton-exchange membrane (PEM) hydrogen production. It is urgent to develop catalysts with excellent OER catalytic performance and stability. Herein, several Iridium-based catalysts were prepared by simple mixing and calcination, the OER properties of catalysts with different melting points of nitrates as calcinating additives were investigated. The RbNO3 treated catalyst displayed a low overpotential(η) of 297.6 mV versus RHE, which is lower than the catalyst calcinated without nitrate (323.8 mV vs. RHE). Moreover, the RbNO3 treated catalyst displayed good acid stability over 20 h Chronopotentiometric test. The high OER catalytic activity and stability of RbNO3 treated catalyst may be attribute to the smaller nanoparticle morphology, pure IrO2 structure and high electrochemical surface area (ECSA), which increase the number of active sites and the intrinsic catalytic activity. This work indicated that the catalyst with excellent OER performance can be obtained by selecting nitrate with moderate melting point as the calcinating additive. Nitrates (like RbNO3) treated catalyst with excellent catalytic activity and stability has good application prospect in hydrogen production of PEM water splitting.
APA, Harvard, Vancouver, ISO, and other styles
6

Gratwick, Adrian. "What’s in a Name? The ‘Diniarchus’ of Plautus’ Truculentus." In ‘Owls to Athens’. Oxford University PressOxford, 1990. http://dx.doi.org/10.1093/oso/9780198144786.003.0034.

Full text
Abstract:
Abstract One might not expect the Greeks to have had words like ‘hoover‘, ‘mackin tosh‘, ‘sandwich‘, ‘biro‘, or ‘wellington‘, but they did, and it is Athenaeus-who else?-who tells us about them. At 11, 467, he quotes a study of Cleanthes (b. 331, d. 232 BC) π ϵ ρi μ ϵ τ α λ η ψ ϵ ωc ‘On transference of meaning‘ α π ó κ α τ αcκ ϵ ν αcα ν τ ω ν ϕ ηciν ó νoμ αcη ν αi τ η ν τ ϵ Ϙ η ρiκ λ ϵioν κ υλiκ α κ αi τ η ν δ ϵiνiα δ α, ‘he says the Thericlean cup and the [kind of shoe called] deinias were named after their inventors‘; and a little further on he quotes more from the same passage, where Cleanthes was evidently making the point (for the text is corrupt: cf. von Arnim SVF i. 133) that these and similar names still commemorated their inventors in a transparent manner, for the words had not undergone linguistic changes which would disguise the personal names-i.e. the sort of change which, in English, has effectively buried rather than commemorated a prominent ninth-century Arabic mathematician in our word ‘algorithm‘ and a well-known Roman grammarian in the old word ‘donet‘ meaning a Latin primer.
APA, Harvard, Vancouver, ISO, and other styles
7

Avery, William H., and Chih Wu. "Closed-Cycle OTEC Systems." In Renewable Energy from the Ocean. Oxford University Press, 1994. http://dx.doi.org/10.1093/oso/9780195071993.003.0011.

Full text
Abstract:
The Rankine closed cycle is a process in which beat is used to evaporate a fluid at constant pressure in a “boiler” or evaporator, from which the vapor enters a piston engine or turbine and expands doing work. The vapor exhaust then enters a vessel where heat is transferred from the vapor to a cooling fluid, causing the vapor to condense to a liquid, which is pumped back to the evaporator to complete the cycle. A layout of the plantship shown in Fig. 1-2. The basic cycle comprises four steps, as shown in the pressure-volume (p—V) diagram of Fig. 4-1. 1. Starting at point a, heat is added to the working fluid in the boiler until the temperature reaches the boiling point at the design pressure, represented by point b. 2. With further heat addition, the liquid vaporizes at constant temperature and pressure, increasing in volume to point c. 3. The high-pressure vapor enters the piston or turbine and expands adiabatically to point d. 4. The low-pressure vapor enters the condenser and, with heat removal at constant pressure, is cooled and liquefied, returning to its original volume at point a. The work done by the cycle is the area enclosed by the points a,b,c,d,a. This is equal to Hc–Hd, where H is the enthalpy of the fluid at the indicated point. The heat transferred in the process is Hc–Ha Thus the efficiency, defined as the ratio of work to heat used, is: . . . efficiency(η)=Hc–Hd/Hc–Ha (4.1.1) . . . Carnot showed that if the heat-engine cycle was conducted so that equilibrium conditions were maintained in the process, that the efficiency was determined solely by the ratio of the temperatures of the working fluid in the evaporator and the condenser. . . . η=TE–Tc/TE (4.1.2) . . . The maximum Carnot efficiency can be attained only for a cycle in which thermal equilibrium exists in each phase of the process; however, for power to be generated a temperature difference must exist between the working fluid in the evaporator and the warm-water heat source, and between the working fluid in the condenser and the cold-water heat sink.
APA, Harvard, Vancouver, ISO, and other styles
8

Webster Roger, Sassani Joseph, Shenk Rodney, and Good Nathan. "A Haptic Surgical Simulator for the Continuous Curvilinear Capsulorhexis Procedure During Cataract Surgery." In Studies in Health Technology and Informatics. IOS Press, 2004. https://doi.org/10.3233/978-1-60750-942-4-404.

Full text
Abstract:
This paper describes a technique for simulating the capsulorhexis procedure during cataract surgery. The continuous curvilinear capsulorhexis technique can be a difficult procedure for beginning ophthalmology surgeons. In the initial phase of tearing the tissue, the tear vector is tangential to the circumference of the tear circle. However, without the proper re-grasping of the flap of torn tissue close to the tear point, the tear vector angle quickly runs downhill possibly causing severe damage to the tissue. Novice surgeons tend to try to complete the capsulorhexis without the time consuming regrasping of the tissue flap. Other factors such as anterior bowing of the lens diaphragm, patient age, and shallow anterior chambers add to the problematic nature of the procedure. Our capsulorhexis simulator models these various tear problems and anomalies to provide a training environment without the dangers of using live patients.
APA, Harvard, Vancouver, ISO, and other styles
9

Silva, Cicero José da, Saulo Felipe Brockes Campos, Leticia Pontes Santos, et al. "BRS platinum banana trees grown with macaxisto rock powder." In UNITING KNOWLEDGE INTEGRATED SCIENTIFIC RESEARCH FOR GLOBAL DEVELOPMENT. Seven Editora, 2023. http://dx.doi.org/10.56238/uniknowindevolp-029.

Full text
Abstract:
The banana (Musa spp.) is one of the fruits most consumed by the population and has great importance in fruit growing. It is a very nutritionally demanding crop and depends on an adequate ratio of nutrients for its development. The objective of the research was to evaluate the development and productivity of the banana tree "BRS Platina" with the use of micaxiste rock powder (soil remineralizer) in the first cultivation cycle. The experiment was conducted at the Federal Institute of Goiano – Campus Morrinhos (-17◦48'50.4" S, 49◦12'16.5'' W, altitude of 902 meters) in a randomized block design. The treatments consisted of fertilization with and without micaxiste rock powder, with seven plants per plot and 12 replications. The plants of the first cycle (mother) were evaluated at 230, 275 and 320 days after transplanting the seedlings. Plant height, pseudostem circumference and number of leaves were measured. When they entered the productive phase and reached the point of harvest, the mass of the bunch, the number of feathers and bananas were evaluated, performing manual counting. The fertilization with micaxiste rock powder favored the vegetative development of the plants, but did not significantly influence the productivity of banana trees "BRS Platina".
APA, Harvard, Vancouver, ISO, and other styles
10

"decreases very gradually between them. In the latitude of Ascension, and 1½ deg. To the Eastward thereof we had 10½ deg.; and about one degree to the E: ward of it, had 9 deg. 52 min. W & at Ascension had 9 deg. 40 min. W – This is a high barren, rocky island about 20 miles in circumference and may be seen 10 leagues in clear weather. It is so intirely barren, that there is not the least appearance of any kind of vegetation nor is there any fresh water on it: these are sufficient reasons for it being unhabited. Yet there are many goats on this island, of which our people shot several; they were very meagre, as might reasonably be expected: and it abounds in sea turtle, the largest and finest perhaps in the world. A ship bound to this island must sail down along the North side of it, and may keep it close aboard it being bold and steep to; and when you come to haul up for the road you must still keep the shoreclose aboard: you may sail within two cables length or less of it (there being no danger) till you bring Cross Hill in the middle of the sandy bay. This Bay is about a large quarter of a mile deep, and about ¾ of a mile wide. The Westernmost point of this bay is dangerous, a reef of rocks running out from it about a mile from the shore, on which, in bad weather, the sea breaks, therefore care must be taken not ot go too near it. The anchoring place is on the NW side of the island off the above-mentioned sandy bay, opposite which inland, there is a high hill by itself, with a flag staff a cross upon it which give it the name of Cross Hill. A good mark for anchoring is to bring Cross Hill on the middle of the sandy bay when it still bear SSE½E and the extreams of the island from NE½E to SW½S when you will be in 10 fathom water, and about ½ a mile of shore. The bottom is sand and gravel, clear ground. This is as good a birth as any in the road. The latitude, observed in Ascension road is 7 deg. 57 min: S. and Long: made from S: Helena, 7 deg. 41 mins W. according to M Maskeylyne’s table of the longitude of places determined by astronomical observations, the true difference of long: between these islands is 8 deg. 10 min: which shews that we have been." In Exploration of the South Seas in the Eighteenth Century: Rediscovered Accounts, Volume I. Routledge, 2016. http://dx.doi.org/10.4324/9781315537368-62.

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

Conference papers on the topic "Η - circumference of a point"

1

Haase, Thomas, Christoph Bosch, Andreas Mondry, and René Rüter. "Analysis of Stress Distribution in Four-Point Bend and Full Ring SSC Tests for SAWL Large-Diameter Pipe." In CONFERENCE 2025. AMPP, 2025. https://doi.org/10.5006/c2025-00344.

Full text
Abstract:
Abstract Understanding the actual effect of stress distribution within longitudinally submerged-arc welded (SAWL) large-diameter pipe is essential for reliable and practical execution of sulfide stress cracking (SSC) tests. To qualify SAWL pipe as SSC resistant, SSC tests are typically performed on four-point bend specimens pre-stressed to a certain level within the elastic regime. For a detailed evaluation of stresses present in pipe and in four-point bend specimens, subjected to typical loads with respect to AYS and SMYS, the local stress at the unmachined part of the inner weld was simulated by a FEM approach indicating local plastic strain in the heat-affected zone (HAZ) of the longitudinal weld. In the same approach, the stress distribution was compared to that of laboratory-scale four-point bend specimens subjected to typical loads defined with respect to actual yield strength (AYS) as well as to stresses in a full pipe body pressurized up to 72 % of specified minimum yield strength (SMYS). It is shown that stresses found in four-point bend specimens when loaded up to 90 % of AYS exceed the stresses in a pressurized pipe by up to 60 % and that residual stresses have a beneficial effect. The findings from the FEM simulation were backed up by experimental internal loading of a full ring test specimen according to ISO 3845 to different stress levels up to 100 % of AYS. For a SAWL large-diameter pipe of grade X65 with a diameter of 864 mm and a wall thickness of 30.4 mm, all strain gauge positions referenced in the standard and additional locations throughout the ring specimen length and circumference were considered to gain detailed understanding of the overall stress distribution and to identify potential local overstressing in base material and along the longitudinal weld. The observed effects of local stress variation should be considered in a performance analysis when defining suitable stress levels for SSC laboratory tests, depending on the type of test, such as four-point bend or full ring test.
APA, Harvard, Vancouver, ISO, and other styles
2

Dent, Phil, Chris Fowler, Stuart Bond, and Sam Mishael. "New Axially Loaded Full Ring Test Method for Assessment of Susceptibility of Girth Welds and Parent Pipe to Sour Service Cracking." In CORROSION 2017. NACE International, 2017. https://doi.org/10.5006/c2017-08965.

Full text
Abstract:
Abstract Susceptibility to cracking in sour service is usually determined by testing in laboratory or simulated service environments, in compliance with NACE MR0175 / ISO 151561. Typically small scale specimens are extracted from sampled material to facilitate uniaxial tensile, C-ring or 4-point bend testing to determine the resistance to Sulfide Stress Cracking (SSC) or Stress Corrosion Cracking (SCC). Sampling relaxes residual stress and in many cases the specimen is not representative of the material surface condition and microstructure, and clearly may not represent material with inhomogeneous properties. This is particularly true for subsea lines installed by reeling as strain history varies around the entire circumference. A full ring ovalization test method was developed in the 1980s / 1990s, which retains the residual stresses, is better able to assess behavior with hoop stress and is still favored today (BS 87012), but it does not load the entire specimen. This paper describes a new axially loaded full ring test method which was developed and demonstrated to combine the benefits of retaining a full as-welded pipe pup-piece, permitting single-sided exposure, with the advantage of tensile loading of the complete tubular specimen.
APA, Harvard, Vancouver, ISO, and other styles
3

Laughlin, Shawn. "Conformable Array Corrosion Mapping Tool." In CORROSION 2010. NACE International, 2010. https://doi.org/10.5006/c2010-10171.

Full text
Abstract:
Abstract Corrosion detected by in-line inspection tools or bell-hole examination must undergo subsequent evaluation to determine the proper action, if any, to be taken. A corrosion assessment must be made before deciding to repair the corroded area or to remove it from service. Traditional practice uses manual measurements along a mapped grid over the locations on the pipe. Newer, more accurate corrosion assessment methods use detailed measurements of the corrosion profile rather than simply the length and maximum depth of the defect area. The industry needs a simple, more accurate method for measuring corrosion patches in the field under adverse environmental conditions. Measurements must be accurate enough to support advanced assessment methods. The design should lend itself to mass production and be inexpensive enough that an operating district or a maintenance department can have a measuring system available for use by field personnel. Further, it should be easy to make the measured data available to engineering personnel for detailed analysis. A flexible printed circuit board laid on the outside circumference of the pipe will provide a reference point to which defect depth can be referenced. The printed circuit card material is imprinted with lift-off transducers on a high-resolution grid, and these transducers are scanned, and the data recorded, then an accurate image of the defect can be obtained. A laptop computer is used to power the array and record the acquired data. Software will display the defect image and automatically extract necessary information for defect assessment. Larger defect areas will be assessed using multiple scans. Software will merge multiple scans into a seamless image. This paper presents a new device for measuring, documenting and assessing external corrosion on steel pipelines. Feasibility and design of the new system were funded by the U.S. Department of Energy through the National Energy Technology Laboratory.
APA, Harvard, Vancouver, ISO, and other styles
4

Hariri, A., J. W. Zu, and R. Ben Mrad. "A New Multiple Point Asperity Model for Contact Between Nominally Flat Surfaces." In ASME 2006 International Mechanical Engineering Congress and Exposition. ASMEDC, 2006. http://dx.doi.org/10.1115/imece2006-13720.

Full text
Abstract:
For several decades, asperities of nominally flat rough surfaces were considered to be points higher than their immediate neighbors. Recently, it has been recognized that this model is inadequate. To address the issue, a new multiple point asperity model, called η-point asperity model, is introduced in this paper. In the new model, asperities are composed of η neighboring sampled points with η-2 middle points being above a certain level. When the separation between two surfaces decreases, new asperities with higher number of sample points, η, will come into existence. Based on the above model, the height and curvature of η-point asperities are defined and their distributions are found. The model is developed for Gaussian surfaces and for the general case of autocorrelation function (ACF). As a case study, the exponential ACF is applied to the new model, which is shown to produce remarkably good agreement with measurements from real and simulated surfaces.
APA, Harvard, Vancouver, ISO, and other styles
5

Ackermann, Alexander, Thomas Jaitner, and Sascha Wischniewski. "Validation of a 3D body scanner system with automated circumference measurement calculation while considering the influence of different 3D data types." In 15th International Conference on Applied Human Factors and Ergonomics (AHFE 2024). AHFE International, 2024. http://dx.doi.org/10.54941/ahfe1004633.

Full text
Abstract:
Anthropometry is crucial in ergonomic designing to ensure accommodation of diverse body sizes and shapes. 3D body scanning systems are now widely employed in anthropometric surveys for collecting data, requiring validation according to ISO 20685-1 for ISO 7250-1 measurements. The aim of this study was to assess the validity of the 3D body scanning system, Vitus Bodyscan, in combination with Anthroscan, for automatically calculated circumference measurements specified in ISO 7250-1, while considering the influence of different 3D data types. Overall, 9 circumference measurements were collected from 44 adult subjects. For the manual measurement, ISO 7250-1 guidelines were considered. For the 3D scanning, each participant was scanned once in a standing posture. Thereafter, proprietary Anthroscan algorithms were used to generate a watertight mesh from the initial 3D point cloud and computed the circumference measurements automatically. With the exception of calf circumference, scan-derived measurements exceeded the acceptable error margins specified in ISO 20685-1 and were therefore not comparable to manual measurements due to several possible factors. Practitioners need to consider these variations when using the scan-derived values. Looking at the differences between scan-derived measurements based on point clouds or watertight meshes, the deviations were negligible for most circumference measurements, except for arm circumference with better results based on point clouds. For simplicity, the authors recommend the use of point clouds for all circumference measurements studied. However, the recommendations are based on the anthropometric measurements and the 3D body scanning system used in this study and cannot be generalized.
APA, Harvard, Vancouver, ISO, and other styles
6

Rutledge, James L., and Jonathan F. McCall. "Determination of Time-Resolved Heat Transfer Coefficient and Adiabatic Effectiveness Waveforms With Unsteady Film Cooling." In ASME Turbo Expo 2012: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/gt2012-68652.

Full text
Abstract:
Traditional hot gas path film cooling characterization involves the use of wind tunnel models to measure the spatial adiabatic effectiveness (η) and heat transfer coefficient (h) distributions. Periodic unsteadiness in the flow, however, causes fluctuations in both η and h. In this paper we present a novel inverse heat transfer methodology that may be used to approximate the η(t) and h(t) waveforms. The technique is a modification of the traditional transient heat transfer technique that, with steady flow conditions only, allows the determination of η and h from a single experiment by measuring the surface temperature history as the material changes temperature after sudden immersion in the flow. However, unlike the traditional transient technique, this new algorithm contains no assumption of steadiness in the formulation of the governing differential equations for heat transfer into a semi-infinite slab. The technique was tested by devising arbitrary waveforms for η and h at a point on a film cooled surface and running a computational simulation of an actual experimental model experiencing those flow conditions. The surface temperature history was corrupted with random noise to simulate actual surface temperature measurements and then fed into an algorithm developed here that successfully and consistently approximated the η(t) and h(t) waveforms.
APA, Harvard, Vancouver, ISO, and other styles
7

Ge, Yuntao, Howard R. Gordon, and Kenneth J. Voss. "Effect of Raman scattering on Fraunhofer lines in the ocean." In OSA Annual Meeting. Optica Publishing Group, 1991. http://dx.doi.org/10.1364/oam.1991.thg2.

Full text
Abstract:
By measuring the change of Fraunhofer lines in the solar spectrum in the water column, information on inelastic scattering process can be extracted. In this paper we model the effect of Raman scattering on Fraunhofer lines in ocean water. The change of Fraunhofer lines in ocean was calculated via Monte Carlo simulations. Six lines, 396.8, 422.7, 486.1, 518.4, 589.0, 656.3 nm, were investigated. Here η, defined as the ratio of the irradiance at the center of the Fraunhofer line to the background, was used to characterize the change of the Fraunhofer lines. It was found that η for 589.0 and 656.3 nm goes to 1 quickly as the depth increases, both for upwelling and downwelling irradiance. The 396.8- and 422.7-nm lines show a different behavior: η for the downwelling irradiance is almost constant while for the upwelling irradiance it is largest at the surface and decreases with depth. The 486.1- and 518.4-nm lines appear to be a dividing point between the shortwave and longwave range. At these wavelengths, η does not change with depth and is always larger in the upwelling irradiance than in the downwelling irradiance.
APA, Harvard, Vancouver, ISO, and other styles
8

Rutledge, James L., and Jonathan F. McCall. "An Inverse Heat Transfer Approach to Mitigating Sources of Experimental Error in Transient Heat Transfer Experiments." In ASME Turbo Expo 2013: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/gt2013-94583.

Full text
Abstract:
The Inverse Flux Solver for Arbitrary Waveforms (IFSAW) algorithm is a transient, simultaneous solution of time resolved adiabatic effectiveness, η(t), and heat transfer coefficient, h(t). Numerical simulations showed IFSAW maintained its high accuracy despite two experimental sources of error typically found when using a transient heat transfer method. The traditional transient method involves exposing a film cooled wind tunnel model at uniform temperature to a step change in freestream temperature. The experimental design results in nearly one-dimensional heat transfer and allows the surface to be modeled as semi-infinite. Typically, the surface temperature history is correlated to an analytical solution to the governing heat transfer equation (yielding η and h), but the required temperature step change is impossible to achieve in a laboratory. This paper first analyzed the error introduced by imperfect step changes and evaluated an alternative methodology, IFSAW, requiring only an arbitrary change in freestream temperature occurring at any rate. Secondly, severe error in h (found in locations where η is near unity because the surface temperature changes little from the initial temperature) was shown to be mitigated using IFSAW combined with a gradual change in coolant temperature at any point during measurement. With both complications, IFSAW maintains its ability to determine periodic η(t) and h(t) waveforms. In these ways, IFSAW is shown to be superior to the legacy transient method.
APA, Harvard, Vancouver, ISO, and other styles
9

Takafuji, Fernanda C. M., and Clo´vis A. Martins. "Comparison of Different Approaches for Fatigue Damage Accumulation in Steel Risers." In ASME 2011 30th International Conference on Ocean, Offshore and Arctic Engineering. ASMEDC, 2011. http://dx.doi.org/10.1115/omae2011-49888.

Full text
Abstract:
Fatigue is one of the main concerns of the offshore industry nowadays, since the failure of equipments could put not only the environment but also some people’s lives in danger. As described in DNV-RP-C203 and in DNV-RP-F204, the aim of fatigue analysis is to verify if a certain structure — in this case, a riser — will be able to operate adequately during a desired period of time, as well as to obtain information to program inspections. In a riser, the efforts vary along its length and also around its circumference. If one considers the stress around the circumference, the maximum stress point may change. To be realistic, one approach is to calculate the stress and fatigue life around the circumference. To be more conservative and also simplify the calculation, one could consider that the maximum stress always occurs at the same point. The purpose of this paper is to compare the fatigue life obtained with both approaches in order to verify the differences between them and verify how conservative that simplification can be. To perform the task, a steel riser is considered and the dynamic analysis is executed in time domain using Orcaflex 9.4. The fatigue is analyzed through the S-N Curve approach and the Miner’s rule is used to accumulate the damage.
APA, Harvard, Vancouver, ISO, and other styles
10

Paredes, Marcelo, Paul Zelenak, and Tomasz Wierzbicki. "A Numerical Study on Crack Growth Resistance Curve of X70 Steels." In ASME 2016 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/pvp2016-63911.

Full text
Abstract:
In this work a phenomenological approach is employed for fracture initation and propagation in SENT specimens. Modified Mohr-Coulomb (MMC) fracture criterion establish the initiation of damage/fracture at the critical material point and the post-initation softening controls its rate of propagation. By means of a tridimensional mixed stress state (equivalent plastic strain, εp; Triaxiality, η; and Lode angle, θ) the nature of the growing crack front can be explained.
APA, Harvard, Vancouver, ISO, and other styles

Reports on the topic "Η - circumference of a point"

1

Rose and Luo. L52069 Guided Wave Sizing and Discrimination for SCC Magnetostriction ILI Inspection. Pipeline Research Council International, Inc. (PRCI), 2003. http://dx.doi.org/10.55274/r0011179.

Full text
Abstract:
With the goal to be able to inspect a large area of the pipe from a single sensor position, hence the development of what we call guided wave inspection. From one point on the circumference of the pipe, it is therefore proposed to inspect the entire circumferential area of the pipe. This approach leads to inspection efficiency.� Experimental techniques cannot be developed on a trial and error basis. The purpose of this work is therefore to develop a guided wave propagation model and subsequent numerical solutions to assist in the �theoretically driven� sensor design and data acquisition systems for improved nondestructive testing including defect detection, location, and potential classification and sizing analysis in a pipe.
APA, Harvard, Vancouver, ISO, and other styles
You might also be interested in the extended bibliographies on the topic 'Η - circumference of a point' for particular source types:
Journal articles
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