Resolution of a Core Problem in Wound Rolls

1980 ◽  
Vol 47 (4) ◽  
pp. 847-854 ◽  
Author(s):  
H. P. Yagoda
Keyword(s):  
Structural Integrity ◽  
Asymptotic Series ◽  
Circumferential Stress ◽  
Practical Interest ◽  
The Core ◽  
Wound Rolls ◽  
Core Boundary ◽  
Closed Form Analytical Solution ◽  
Winding Tension ◽  
Core Problem

Previous misunderstandings about the behavior of stresses in the vicinity of the core of wound rolls are resolved through the development of an explicit closed-form analytical solution for the radial and circumferential stresses which are generated during winding; the solution holds in the general case of variable winding tension. Asymptotic series are derived and then employed to compute profiles of stresses within the wound material for several cases of practical interest. A parametric analysis of the influence of core elasticity on structural integrity of the roll underscores the indispensable support provided by the core at the inner boundary of the roll. Results show that the circumferential stress in the vicinity of the core strongly depends on core stiffness. A relation that is derived between interlayer pressure and circumferential stress at the core boundary may be useful as a guide in core design and in preventing roll collapse.

The Decay of a Turbulent Trailing Vortex

1970 ◽  
Vol 21 (1) ◽  
pp. 69-78 ◽  
Author(s):  
P. R. Owen
Keyword(s):  
Practical Interest ◽  
Circumferential Velocity ◽  
Essential Difference ◽  
Mean Flow ◽  
Irrotational Flow ◽  
The Core ◽  
Core Boundary ◽  
Flow Through ◽  
The Mean ◽  
Image Position

SummaryThe decay of a trailing vortex containing a turbulent core is examined according to the argument that the turbulence is partly sustained by, and interacts with, the irrotational flow through viscous diffusion of eddies across the core boundary. The region separating the core from the outer irrotational flow, in which the interaction between the turbulence and the mean flow occurs, expands with time like (time)1/2, characteristic of viscous diffusion.On the basis of a simple representation of the radial distribution of mean circumferential velocity, the decay of the vortex is calculated and is found to behave in a way similar to what Squire predicted, on the assumption of a constant eddy viscosity, in 1954. The essential difference from Squire’s solution found here is that the apparent viscosity is not simply proportional to the initial circulation about the vortex as he proposed, but depends on the Reynolds number defined with respect to the circulation.Wind tunnel and flight observations of vortex decay can be more closely reconciled than Squire’s theory allowed; those differences that exist are attributed to the vastly different ages of the vortices in the laboratory and flight experiments. The principal conclusion of practical interest is that the maximum circumferential velocity in a trailing vortex generated by an aeroplane in flight iswhere Γ is the circulation about large circuits enclosing the vortex, v the kinematic viscosity of the air and t the (sufficiently great) age of the vortex.

Corrugation and Buckling Defects in Wound Rolls

2005 ◽  
Vol 128 (1) ◽  
pp. 56-64 ◽  
Author(s):  
P. M. Lin ◽  
J. A. Wickert
Keyword(s):  
Design Space ◽  
Elastic Stability ◽  
Internal Stresses ◽  
Core System ◽  
The Core ◽  
Acceptable Quality ◽  
Wound Rolls ◽  
Winding Tension ◽  
Elastic Shear ◽  
The Web

Sheet metal, paper, and polymer webs are often stored and processed as large rolls comprising thousands of layers. Depending on the elastic properties of the web material, the roll’s dimensions, the type of core, and the winding tension, the stresses that develop within the roll can be sufficiently high to cause local or gross buckling defects to form. For instance, the cylindrical core onto which the web is wound can collapse, a failure mode that is termed “v-buckling.” In other cases, while the core might remain intact, a group of layers interior to the roll can wrinkle into a near-sinusoidal corrugated pattern around the circumference. This paper examines such “starring” defects analytically and experimentally. Measurements on a laboratory-scale web transport system are used to validate the model, and to identify conditions where no defects occur and the roll has acceptable quality, where starring patterns develop, and where v-buckling occurs. For particular core and web materials, the tension and diameter are the primary variables that influence the roll’s stability, and demarcations between stable and buckled configurations are identified in the tension-diameter design space. A model for the elastic stability of the roll-core system is developed, in which the corrugated layers are treated as multiple rings subjected to the resultant pressure generated by the roll’s internal stresses, and to the elastic support provided by the core and neighboring web layers. At the onset of corrugation, adjacent web layers couple through surface contact which is incorporated in the model as an elastic shear layer.

In a word, I’ve been there

2019 ◽  
pp. 246-256
Author(s):  
A. K. Zholkovsky
Keyword(s):  
The State ◽  
Female Characters ◽  
Political Situation ◽  
The Core ◽  
The Relationship ◽  
Core Problem ◽  
Typical Solution

In his article, A. Zholkovsky discusses the contemporary detective mini-series Otlichnitsa [A Straight-A Student], which mentions O. Mandelstam’s poem for children A Galosh [Kalosha]: more than a fleeting mention, this poem prompts the characters and viewers alike to solve the mystery of its authorship. According to the show’s plot, the fact that Mandelstam penned the poem surfaces when one of the female characters confesses her involvement in his arrest. Examining this episode, Zholkovsky seeks structural parallels with the show in V. Aksyonov’s Overstocked Packaging Barrels [Zatovarennaya bochkotara] and even in B. Pasternak’s Doctor Zhivago [Doktor Zhivago]: in each of those, a member of the Soviet intelligentsia who has developed a real fascination with some unique but unattainable object is shocked to realize that the establishment have long enjoyed this exotic object without restrictions. We observe, therefore, a typical solution to the core problem of the Soviet, and more broadly, Russian cultural-political situation: the relationship between the intelligentsia and the state, and the resolution is not a confrontation, but reconciliation.

PERANCANGAN IDENTITAS VISUAL REBRANDING CITRA PERUSAHAAN CEMARA CERAMICS (DESIGN OF CEMARA CERAMICS VISUAL REBRANDING IDENTITY)

2021 ◽  
Vol 4 (1) ◽  
pp. 1
Author(s):  
Anak Agung Ngurah Gede Marhendra ◽  
Agung Eko Budiwaspada ◽  
Sangayu Ketut Laksemi Nilotama
Keyword(s):  
Design Thinking ◽  
Corporate Identity ◽  
Corporate Image ◽  
Visual Design ◽  
Stage Design ◽  
The Core ◽  
Visual Identity ◽  
The Creation ◽  
Strategy Design ◽  
Core Problem

<p>Abstract Design of Cemara Ceramics Visual Rebranding Identity aims to produce a concept strategy and visual rebranding of the Cemara Ceramics company and produce a Cemara Ceramics rebranding visual identity design in order to encourage the creation of a new identity image. The method in this design uses a 5-stage Design Thinking approach, namely Empathize, Define, Ideate, Prototype and Test. The result achieved is the design of the new Cemara Ceramics corporate identity. With the use of the design thinking method in this research, various problems related to the company image of Cemara Ceramics can be found. The core problem obtained is how to design a strategy and concept of visual identity rebranding to encourage the creation of a new corporate image of Cemara Ceramics.</p><p>Keywords: visual rebranding identity, concept strategy, design thinking</p><p>Abstrak Perancangan Identitas Visual Rebranding Citra Perusahaan Cemara Ceramics ini bertujuan untuk menghasilkan strategi konsep dan visual rebranding perusahaan Cemara Ceramics serta menghasilkan rancangan identitas visual rebranding Cemara Ceramics dalam rangka mendorong terciptanya citra identitas yang baru. Metode dalam perancangan ini menggunakan pendekatan 5 tahapan Design Thinking yaitu Empathize, Define, Ideate, Prototype dan Test. Hasil yang dicapai yaitu rancangan corporate identity Cemara Ceramics yang baru. Dengan adanya penggunaan metode design thinking pada penelitian ini dapat menemukan berbagai permasalahan terkait citra perusahaan Cemara Ceramics. Permasalahan inti yang didapat yaitu mengenai bagaimana merancang strategi dan konsep identitas visual rebranding untuk mendorong terciptanya citra baru perusahaan Cemara Ceramics.</p><p>Kata kunci: identitas visual rebranding, strategi konsep dan visual, design thinking</p>

scholarly journals Behaviour of eccentrically inclined loaded rectangular foundation on reinforced sand

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Sujata Gupta ◽  
Anupam Mital
Keyword(s):  
Bearing Capacity ◽  
Loading Conditions ◽  
Test Results ◽  
Bearing Capacity Ratio ◽  
Reinforced Sand ◽  
The Core ◽  
Capacity Ratio ◽  
Core Boundary ◽  
Rectangular Foundation ◽  
Increasing Load

Abstract This study presents the behaviour of model footing resting over unreinforced and reinforced sand bed under different loading conditions carried out experimentally. The parameters investigated in this study includes the number of reinforced layers (N = 0, 1, 2, 3, 4), embedment ratio (Df /B = 0, 0.5, 1.0), eccentric and inclined ratio (e/L, e/B = 0, 0.05, 0.10, 0.15) and (a = 0°, 7°, 14°). The test sand was reinforced with bi-axial geogrid (Bx20/20). The test results show that the ultimate bearing capacities decrease with axial eccentricity and inclination of applied loads. The test results also show that the depth of model footing increase zero to B (B = width of model footing), an increase of ultimate bearing capacity (UBC) approximated at 93%. Similarly, the multi-layered geogrid reinforced sand (N = 0 to 4) increases the UBC by about 75%. The bearing capacity ratio (BCR) of the model footing increases with an increasing load eccentricity to the core boundary of footing; if the load eccentricities increase continuity, the BCR decreases. The tilt of the model footing is increased by increasing the eccentricity and decreases with increasing the number of reinforcing layers.

scholarly journals Mind mapping as a tool of teaching English vocabulary at transport university

2021 ◽  
Vol 295 ◽  
pp. 05021
Author(s):  
Oksana Marunevich ◽  
Elmira Shefieva ◽  
Olga Bessarabova
Keyword(s):  
Educational Process ◽  
Control Group ◽  
Teaching English ◽  
Mind Mapping ◽  
New Words ◽  
The Core ◽  
Mind Maps ◽  
The Given ◽  
Core Problem ◽  
Experimental Group

The core problem of teaching English as a second language at transport university is students’ poor knowledge of vocabulary. Current solutions to the given problem such as providing word explanations and repetitive practices are ineffective. We strongly believe that the mindmapping technique proposed by Tony Buzan as a note-taking method is a novel, yet an extremely potent tool that aids students in enlarging their professional word stock by associating new vocabulary to their existing knowledge using colors, images, symbols, etc. As might have been expected, the findings of our study point towards the idea that the strong visual appeal of mind maps created by easy-to-use software boosted the educational process and helped students of the experimental group memorize more new words in contrast to students of the control group.

scholarly journals Modifikasi Algoritma Genetika untuk Penyelesaian Permasalahan Penjadwalan Pelajaran Sekolah

2014 ◽  
Vol 10 (1) ◽  
pp. 111
Author(s):  
Rahman Erama ◽  
Retantyo Wardoyo
Keyword(s):  
Genetic Algorithm ◽  
Genetic Algorithms ◽  
Effective Algorithm ◽  
Scheduling Problems ◽  
The Core ◽  
Alternative Algorithm ◽  
Crossover Phase ◽  
School Scheduling ◽  
Core Problem ◽  
Standard Genetic Algorithm

AbstrakModifikasi Algoritma Genetika pada penelitian ini dilakukan berdasarkan temuan-temuan para peneliti sebelumnya tentang kelemahan Algoritma Genetika. Temuan-temuan yang dimakasud terkait proses crossover sebagai salah satu tahapan terpenting dalam Algoritma Genetika dinilai tidak menjamin solusi yang lebih baik oleh beberapa peneliti. Berdasarkan temuan-temuan oleh beberapa peneliti sebelumnya, maka penelitian ini akan mencoba memodifikasi Algoritma Genetika dengan mengeliminasi proses crossover yang menjadi inti permasalahan dari beberapa peneliti tersebut. Eliminasi proses crossover ini diharapkan melahirkan algoritma yang lebih efektif sebagai alternative untuk penyelesaian permasalahan khususnya penjadwalan pelajaran sekolah.Tujuan dari penelitian ini adalah Memodifikasi Algoritma Genetika menjadi algoritma alternatif untuk menyelesaikan permasalahan penjadwalan sekolah, sehingga diharapkan terciptanya algoritma alternatif ini bisa menjadi tambahan referensi bagi para peneliti untuk menyelesaikan permasalahan penjadwalan lainnya.Algoritma hasil modifikasi yang mengeliminasi tahapan crossover pada algoritma genetika ini mampu memberikan performa 3,06% lebih baik dibandingkan algoritma genetika sederhana dalam menyelesaikan permasalahan penjadwalan sekolah. Kata kunci—algoritma genetika, penjadwalan sekolah, eliminasi crossover  AbstractModified Genetic Algorithm in this study was based on the findings of previous researchers about the weakness of Genetic Algorithms. crossover as one of the most important stages in the Genetic Algorithms considered not guarantee a better solution by several researchers. Based on the findings by previous researchers, this research will try to modify the genetic algorithm by eliminating crossover2 which is the core problem of several researchers. Elimination crossover is expected to create a more effective algorithm as an alternative to the settlement issue in particular scheduling school.This study is intended to modify the genetic algorithm into an algorithm that is more effective as an alternative to solve the problems of school scheduling. So expect the creation of this alternative algorithm could be an additional resource for researchers to solve other scheduling problems.Modified algorithm that eliminates the crossover phase of the genetic algorithm is able to provide 2,30% better performance than standard genetic algorithm in solving scheduling problems school. Keywords—Genetic Algorithm, timetabling school, eliminate crossover

scholarly journals Analisis Kemampuan Berpikir Kritis Siswa Kelas X SMA dalam Menyelesaikan Masalah Identitas Trigonometri Ditinjau dari Gender

2018 ◽  
Vol 6 (2) ◽  
pp. 111 ◽  
Author(s):  
Syafruddin Kaliky ◽  
Fahruh Juhaevah
Keyword(s):  
Critical Thinking ◽  
Female Student ◽  
Male Student ◽  
Identity Problem ◽  
School Subject ◽  
Critical Thinking Ability ◽  
The Core ◽  
Thinking Ability ◽  
Gender Based ◽  
Core Problem

Abstrak Penelitian ini bertujuan untuk menganalisis kemampuan berpikir kritis dalam menyelesaikan masalah identitas trigonometri ditinjau dari gender di SMA. Dalam pengambilan subjek dilakukan dengan cara think a loud. Siswa yang cenderung memenuhi kriteria berpikir kritis selanjutnya dikelompokkan berdasarkan gender. Berdasarkan data jenuh yang diperoleh berdasarkan masing-masing gender, selanjutnya di ambil masing-masing satu orang untuk dianalisis kemampuan berpikir kritis. Berdasarkan hasil analisis kemampuan berpikir kritis ditinjau dari gender dalam menyelesaikan masalah identitas trigonometri diperoleh bahwa siswa yang berjenis kelamin laki-laki dan siswa yang berjenis kelamin perempuan cenderung memenuhi 5 indikator berpikir kritis yaitu (1) mampu merumuskan pokok permasalahan; (2) mampu mengungkapkan fakta yang dibutuhkan dalam menyelesaikan suatu masalah; (3) mampu memilih argumen yang logis, relevan dan akurat; (4) mampu mendeteksi bias berbeda pada sudut pandang berbeda dan (5) Mampu menentukan akibat dari suatu pernyataan yang di ambil sebagai suatu keputusan. Dalam proses penyelesaian berdasarkan tahapannya tampak bahwa siswa perempuan cenderung teliti dan sistematis dibandingkan siswa laki-laki. Kata kunci: Kemampuan berpikir kritis, gender. Abstract This study aimed to analyze critical thinking ability when solved trigonometry identity problem based on gender difference in senior high school. Subject were selected by think a loud. Most of student can do critical thinking criteria and then make a group difference based on gender. Based on saturated data that have obtained for each gender, and then take one of them to analyze critical thinking ability. Based on result shows that male student and female student mostly can complete five indicators of critical thinking such as 1) can formulate the core problem; 2) can express fact that requirement to solve the problem; 3) can choose logically argument, relevant, and accurate; 4) can detect different refraction when get different solution; and 5) can determint cause of the statement that it have took as a decision. When solved the problem based on the its phase, showed that female student are more careful and more sistematic than male student.

The Risk Probability Analysis of Oil Spill on Offshore Facilities Based on ETA

2013 ◽  
Vol 864-867 ◽  
pp. 809-814
Author(s):  
Yun Bin Li ◽  
Cheng Gang Tang ◽  
Xian Feng Wang ◽  
Peng Xu
Keyword(s):  
Oil Spill ◽  
Bohai Sea ◽  
Marine Pollution ◽  
Probability Model ◽  
Pollution Prevention ◽  
The Bohai Sea ◽  
The Core ◽  
Eta Model ◽  
Subsea Pipelines ◽  
Core Problem

The oil spill probability is the core problem on studying the risk of oil spill. The oil spill probability model of offshore facilities is established, which based on the ETA model and the oil spill reason analysis of offshore facilities and subsea pipelines. Through a lot of statistics, combined with the actual situation in the Bohai Sea, the probability of various events is calculated. Finally the probability of oil spill for the Bohai Sea oil facilities and subsea pipelines is calculated and providing references for marine pollution prevention and the study of oil spill risks.

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