scholarly journals Embedded Resistance Wire Technique for Epoxy Curing and Self-Healing of PET Thermoplastics

Solids ◽  
2021 ◽  
Vol 2 (3) ◽  
pp. 314-330
Author(s):  
Lykourgos C. Kontaxis ◽  
Athanasios Kotrotsos ◽  
Spyros Verbis ◽  
George C. Papanicolaou
Keyword(s):  
Electrical Current ◽  
Fixed Time ◽  
Self Healing ◽  
Three Point Bending ◽  
Resistance Wire ◽  
Thermoset Resins ◽  
Direct Electrical Current ◽  
Epoxy Curing ◽  
Curing Method ◽  
The Right

The aim of the present study is to apply an embedded resistance wire technique for curing of thermosetting resins as well as for the self-healing of thermoplastic polymers. The work consists of two parts. In the first part, Kanthal resistance wires embedded in a resin plate acted as heating elements when direct electrical current was flowing through them (Joule heating). During heating, the temperature was continuously monitored using a thermal camera, and accurate temperature times for fixed position diagrams as well as temperature positions for fixed time diagrams were calculated. The effects of curing with this method were evaluated by studying the three-point bending mechanical behavior of the cured resin, comparing it with the corresponding behavior of the same resin when cured using a conventional oven curing method at the same temperature. In the second part of the present work, the possibility of using the same technique for healing existing notches and flaws in a PET thermoplastic is explored. We examined whether providing energy through the resistance wires created the right amount of heat to heal the thermoplastic, or, more specifically, whether it closed the notches and eliminated the abrasions that were artificially created on the specimens. The technique using embedded resistance wires worked equally well, with interesting and promising preliminary results regarding the curing of thermoset resins and the healing of thermoplastics.

The brain structure and neurosecretory cells of noctuid moth Anadevidia peponis: Noctuidae

1990 ◽  
Vol 48 (3) ◽  
pp. 436-437
Author(s):  
M. Sato ◽  
Y. Ogawa ◽  
M. Sasaki ◽  
T. Matsuo
Keyword(s):  
Biological Clock ◽  
Virgin Female ◽  
Basic Structure ◽  
Fixed Time ◽  
Neurosecretory Cells ◽  
Nerve Cells ◽  
Noctuid Moth ◽  
The Right ◽  
20 Nm ◽  
The Brain

A virgin female of the noctuid moth, a kind of noctuidae that eats cucumis, etc. performs calling at a fixed time of each day, depending on the length of a day. The photoreceptors that induce this calling are located around the neurosecretory cells (NSC) in the central portion of the protocerebrum. Besides, it is considered that the female’s biological clock is located also in the cerebral lobe. In order to elucidate the calling and the function of the biological clock, it is necessary to clarify the basic structure of the brain. The observation results of 12 or 30 day-old noctuid moths showed that their brains are basically composed of an outer and an inner portion-neural lamella (about 2.5 μm) of collagen fibril and perineurium cells. Furthermore, nerve cells surround the cerebral lobes, in which NSCs, mushroom bodies, and central nerve cells, etc. are observed. The NSCs are large-sized (20 to 30 μm dia.) cells, which are located in the pons intercerebralis of the head section and at the rear of the mushroom body (two each on the right and left). Furthermore, the cells were classified into two types: one having many free ribosoms 15 to 20 nm in dia. and the other having granules 150 to 350 nm in dia. (Fig. 1).

scholarly journals Determination of the order of fractional derivative for subdiffusion equations

2020 ◽  
Vol 23 (6) ◽  
pp. 1647-1662
Author(s):  
Ravshan Ashurov ◽  
Sabir Umarov
Keyword(s):  
Fractional Derivative ◽  
Fixed Time ◽  
Time Instant ◽  
Observation Data ◽  
Additional Information ◽  
Fractional Modeling ◽  
Time Fractional Derivative ◽  
The Right ◽  
Right Order

Abstract The identification of the right order of the equation in applied fractional modeling plays an important role. In this paper we consider an inverse problem for determining the order of time fractional derivative in a subdiffusion equation with an arbitrary second order elliptic differential operator. We prove that the additional information about the solution at a fixed time instant at a monitoring location, as “the observation data”, identifies uniquely the order of the fractional derivative.

scholarly journals Maize stalk stiffness and strength are primarily determined by morphological factors

2022 ◽  
Vol 12 (1) ◽  
Author(s):  
Christopher J. Stubbs ◽  
Ryan Larson ◽  
Douglas D. Cook
Keyword(s):  
Material Properties ◽  
Structural Strength ◽  
Biological Activities ◽  
Structural Parameters ◽  
Sensitivity Analyses ◽  
Bioenergy Crops ◽  
Tissue Properties ◽  
Three Point Bending ◽  
X Ray Computed ◽  
The Right

AbstractThe maize (Zea mays) stem is a biological structure that must balance both biotic and structural load bearing duties. These competing requirements are particularly relevant in the design of new bioenergy crops. Although increased stem digestibility is typically associated with a lower structural strength and higher propensity for lodging, with the right balance between structural and biological activities it may be possible to design crops that are high-yielding and have digestible biomass. This study investigates the hypothesis that geometric factors are much more influential in determining structural strength than tissue properties. To study these influences, both physical and in silico experiments were used. First, maize stems were tested in three-point bending. Specimen-specific finite element models were created based on x-ray computed tomography scans. Models were validated by comparison with experimental data. Sensitivity analyses were used to assess the influence of structural parameters such as geometric and material properties. As hypothesized, geometry was found to have a much stronger influence on structural stability than material properties. This information reinforces the notion that deficiencies in tissue strength could be offset by manipulation of stalk morphology, thus allowing the creation of stalks which are both resilient and digestible.

scholarly journals Morphologic aspects of the genital tract from Nellore cows undergoing gynecological screening to insertion in the fixed-time artificial insemination (TAI) program

2014 ◽  
Vol 31 (02) ◽  
pp. 118-122
Author(s):  
R. Mello ◽  
M. Mello ◽  
M. Abidu-Figueiredo ◽  
P. Scherer ◽  
H. Palhano
Keyword(s):  
Artificial Insemination ◽  
Genital Tract ◽  
Body Condition Score ◽  
Fixed Time ◽  
The Body ◽  
Morphological Aspects ◽  
Functional Aspects ◽  
Condition Score ◽  
The Right ◽  
Rectal Palpation

Abstract Introduction: This study aimed to evaluate the morphology of the genital tract from 98 Nellore cows by rectal palpation and combine them with the functional aspects for inclusion in a fixed-time artificial insemination (TAI) program. Methods: Were evaluated the ovaries, cervix and vulva, as well as the body condition score (BCS scale 1-5). Results: In relation to the ovaries, there were palpable structures found in 51 (17 CL and 34 FL) in the rights ovarian and 37 palpable structures (06 CL and 31 FL) in the left ovary. Asymmetry was found in 17.3% and uterine cervicitis in 20.4% of examined females. Changes were noted in vulva in 51.0% (40 to 10 papules and hyperemia) and the average of BCS was 3.15. On the basis of morphological aspects founded, 29 females with an average of BCS 2.7 and 01 with metritis were excluded and 07 (BCS-3, 5) inseminated immediately after the exam, with 61 included in the TAI program. These data support the conclusion that of all ovulations occurred, characterized by the presence of CL, most occurred in the right ovary (73.9%). The prevalence rate (51%) of vulvar aspects found, indicate a need for research of reproductive diseases in their flock. Conclusion: The BCS may impacts on the cyclicity and in the pregnancy rate of females included in the program.

scholarly journals Legal Nature and Role of Swap Arrangements and Options as Financial Instruments

2019 ◽  
Vol 57 (4) ◽  
pp. 459-480
Author(s):  
Ružica Petrović ◽  
Tamara Milenković Kerković ◽  
Dragana Radenković Jocić
Keyword(s):  
Interest Rate ◽  
Financial Markets ◽  
Financial Innovation ◽  
Fixed Time ◽  
Financial Derivatives ◽  
Bank Loans ◽  
Bond Issues ◽  
Legal Nature ◽  
The Right ◽  
Exclusive Right

AbstractFinancial derivatives are, in the last forty years, the most important financial innovation that influence the creation of new, very deep and broad financial markets. Their number is constantly increasing. There is a creation of new variants of existing derivative contracts and therefore the subjects have the opportunity to differently manage risk. Although their controversial legal nature, generally accepted view is that they were contracts. Swap is the youngest of all financial derivatives and represents a financial innovation of a later date. Market swaps recorded one of the fastest growth rate among global financial markets. Swap represents a private agreement between the two parties regarding exchange cash flow of the fixed time in the future in accordance with a predetermined pattern. The most common users of swaps are non-financial corporations, which want to receive variable, and to pay a fixed interest rate in order to limit interest expenses on bank loans or bond issues with variable interest rate, as well as banks, the governments of some supranational institutions such as the World Bank. In economic theory emphasized is the view that the comparative advantage is the basis for swaps functioning. Options are contracts in which one party has the exclusive right, while the other contracting party assumes only the obligation to buy or sell assets to which the option is created. In the nationa legislation the option contract is transferable standardized contract binding the buyer has the right to, including the payment obligation of the agreed premium on the day or days of maturity specified in the contract.

Safe control of palmoplantar hyperhidrosis with direct electrical current

2002 ◽  
Vol 41 (9) ◽  
pp. 602-605 ◽  
Author(s):  
Yunus Karakoç ◽  
Ertuğrul H. Aydemir ◽  
M. Tunaya Kalkan ◽  
Gaye Ünal
Keyword(s):  
Electrical Current ◽  
Direct Electrical Current ◽  
Safe Control

scholarly journals Different Types of Maculopathy in Eyes after a High-Voltage Electrical Shock Injury

2019 ◽  
Vol 10 (1) ◽  
pp. 19-23 ◽  
Author(s):  
Hye Rim Choe ◽  
Un Chul Park
Keyword(s):  
Optical Coherence Tomography ◽  
Visual Acuity ◽  
High Voltage ◽  
Electrical Current ◽  
Final Visit ◽  
Electrical Injury ◽  
Electrical Shock ◽  
Retinal Atrophy ◽  
Different Types ◽  
The Right

Background: We report a case of different types of maculopathy in eyes after a high-voltage electrical shock injury. Case Report: A 43-year-old male suffered high-voltage electrical injury through his left arm. He underwent cataract surgery in both eyes 3 months after the injury, but there was no vision improvement. Ocular examination, including spectral domain optical coherence tomography, revealed diffuse retinal atrophy in the left eye which did not change until the final visit. In the right eye, an impending macular hole was observed but regressed spontaneously 9 months after the injury, and the visual acuity improved to 20/32 at the final visit. Conclusion: Two different types of maculopathy can occur in each eye after high-voltage electrical shock injury, and this might be due to asymmetric pathogenesis of the eyes according to the proximity to the route of electrical current.

Stimulation of bone formation by direct electrical current in an orthopedically expanded suture in the rat

2010 ◽  
Vol 40 (2) ◽  
pp. 106 ◽  
Author(s):  
Tancan Uysal ◽  
Mihri Amasyali ◽  
Huseyin Olmez ◽  
Yildirim Karslioglu ◽  
Omer Gunhan
Keyword(s):  
Bone Formation ◽  
Electrical Current ◽  
Direct Electrical Current ◽  
Stimulation Of
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