Coil Form Research Articles

DESIGN OF A CABLE PACKAGING SYSTEM CAPABLE OF SECURING CABLE ENDS WITHOUT THE USE OF AUXILIARY MATERIALS

Cable packaging machines are devices that automatically wrap long and thin materials, such as wires, cables, and pipes, into organized packages. These machines play a crucial role in cable production by saving time and labor during the manufacturing process. While there are various types and features of cable packaging machines, their common objective is to ensure that materials are wrapped to the correct size, tightly packed, and easily transported. In this study, the performance of a newly designed and manufactured machine was evaluated. This machine is capable of packaging cables in coil form without the use of auxiliary materials such as twine, stretch film, or straps. The system is composed of seven main sections: the flayer, tension control unit, traverse unit, cable winding heads, clamp group, shrink unit, and the main control panel. A noteworthy feature of the machine is that the cable winding heads can rotate 180°, and the elimination of auxiliary materials in the packaging process reduces costs and minimizes the time lost during cable winding. Experimental results show that the machine is capable of wrapping 12 coils per minute for short-length cables (5 m, 10 m, 15 m, 20 m, 25 m) and 8 coils per minute for long-length cables (50 m, 100 m).

Determination of personal exposure to volatile organic compounds and their health risks after the use of mosquito repellents in residential environments using passive sampling

The ubiquitous use of mosquito repellents in homes across Asia, Africa, and South America is related with human exposure to indoor volatile organic compounds (VOCs). There are three primary types of mosquito repellents: those in the form of coils, mats, and liquids. The repellent mechanisms of these products are distinct, resulting in the generation of varying types of VOCs during the repellent process. In this study, the emission characteristics of commercial coil-, mat-, and liquid-type mosquito repellents were observed in a laboratory chamber using real-time measurement. A previously developed personal passive sampler, ePTFE PS, was used to quantify personal exposure to indoor VOCs while 86 volunteers habitually used those three representative types for 3 h in their residence. Notable increase of indoor benzene was observed for coil- and mat-type mosquito repellents, while α-pinene concentration increased significantly following the use of liquid-type mosquito repellent. The average incremental cancer risks for benzene were 10−6 to 10−4 for adults following the use of coil- and mat-type mosquito repellents. The average non-cancer risks for all chemicals were <1 after the use of three types of mosquito repellents. Considering the potential human health risks associated with byproducts (e.g., particulate matter or carbon monoxide from incomplete combustion) emitted after mosquito coil use, further research on this topic is warranted.

Theoretical investigation on the host−guest interactions in enhanced oil recovery

Supramolecular polymers have great application potential in oilfield production. Therefore, according to the characteristics and production requirements of low-permeability oilfields, developing new supramolecular functional units will be a research trend in the future. In this work, a cyclodextrin-modified Trimellitic acid (TA-β-CD) molecule was designed as the new supramolecular functional units. Then, molecular dynamics (MD) simulations and quantum chemistry (QC) calculations were employed to investigate the TA-βCD and poly acrylamide (pAM-Ad) assembly mechanism, intermolecular interaction and dynamic characteristics. It is found that polyacrylamide supramolecular polymer exists in the form of molecular coils in water. Through the molecular recognition and molecular docking of β-CD and Ad molecules, different molecular coils were linked together by Ad-β-CD supramolecular assembly. Finally, three-dimensional network structure was formed, which greatly increased the viscosity of the system. During this mechanism, the TA-βCD behaves as a "two-way connector", becoming the connection point of the three-dimensional space network. Based on our results, the general rules of supramolecular flooding can be summarized at the molecular level, which helps screen out efficient supramolecular polymers units.

A numerical study on homogeneity and central field with axial spacing between DP coils of HTS magnet at 65 K

A numerical study is performed with COMSOL multi-physics, to analyze the effect of axial spacing between double pancake (DP) coils on central magnetic field and field homogeneity of High temperature Superconducting (HTS) magnet. The magnet is wound in the form of DP coils having, inner winding diameter as 100 mm and is operated at 65 K. The field homogeneity is calculated over a Diameter of Spherical Volume (DSV) of 40 mm for the entire study. The analysis is carried out by considering a constant length of HTS tape of 750 m and varying the number of DP coils from 4 to 14. The number of turns in all the DP coil is equal for a given set of DP coils to maintain the length of HTS tape to be constant. The coil separation within DP coils is of constant gap from 0.5 to 2 mm, while the axial spacing between the DP coils is varied from 0 to 50 mm for all the set of DP coils. The optimum gap between DP coils was evaluated using Exhaustive search optimization techniques and decreased with the number of DP coils. The best field homogeneity of 662.5 ppm was achieved with 14 DP coils having gDP=20.3 mm and gSP=2 mm for the chosen solenoid configuration.

An ATP-free packaging of T4 DNA

Packaging of viral DNA into a capsid with liquid crystalline density is a crucial step in viral reproduction. DNA packaging with an adenosine triphosphate (ATP)-fueled molecular motor is an established viral DNA packaging mechanism system. On the other hand, DNA is compacted by the conformational change attributable to multivalent cations exclusively at valences higher than three. The conformational change of DNA was not considered as a mechanism of DNA packaging of viruses. Here, T4 DNA, ejected from a capsid in the ambient concentration of phosphate corresponding to the intra-cell concentration, is packaged into the capsid when the phosphate concentration decreases to the extra-cell concentration in coexistence with divalent cations, that is, Ca2+ and Mg2+. The compaction and packaging processes coincide with the conformational change of DNA. Divalent cations can compact T4 DNA when the counter anion is phosphate. The DNA-packaged and re-generated virions showed equivalent infective ability with the original populations. Fluorescent microscopy distinguished the conformational changes of DNA between compact forms and coil forms. Packaged or unpackaged DNA was confirmed enzymatically. Plaque-forming unit (Pfu) was used as the measure of infectious ability of virions. The concentration of ATP was measured by the luminometric method. The packaging process was proceeded in picomolar or lower concentration of ATP. This series of procedures may constitute a new ATP-free or low-ATP approach to packaging viral DNA with DNA conformational change underpinning the process. The results from this study may disclose an undiscovered facet of T4 life cycle.

Dynamic stabilisation of magnetic fields measured inside a magnetically shielded room using an external coil system *

Magnetoencephalography (MEG) system based on optically pumped magnetometers (OPMs) requires a magnetically shielded room (MSR) to establish a stable near-zero field environment. Affected by external environmental electromagnetic interference, the magnetic noise in the MSR will become very severe. In order to overcome this problem, this paper proposes a method for dynamic stabilisation of magnetic fields measured inside a MSR using an external coil system. Firstly, the field form of the external compensation coil was analysed by taking the AC characteristics of the material into consideration. Then, the linear characteristic of the control system is studied and a high performance magnetic noise suppression controller is designed based on the environment noise characteristics. Finally, simulation and experimental are carried out through a self-developed 1250 mm × 1250 mm × 2100 mm MSR, which indicates that the proposed method can effectively suppress dynamic magnetic fluctuation and noise.

Synthesis and Characterization of Graphitic Carbon Nanostructures from Cellulose Extraction of Durian Peel Waste

The synthesis of graphitic carbon nanostructures from cellulose extraction of durian peel waste has been successfully carried out in this study. This study aim to produce the graphitic carbon nanostructures to give innovative solutions to the renewable energy storage challenge. Durian peel cellulose was synthesized into graphitic carbon nanostructures through catalytic graphitization method. 4.8 grams of durian peel cellulose was hydrocharred at 200°C for 4 hours, then impregnated using Fe(NO3).9H2O and ethanol for 90 minutes. The sample was then precipitated for 12 hours and dried at 60°C. The sample was pyrolysed at 900°C for 3 hours. Characterization was carried out using TEM and XRD. Characterization TEM showed the morphological characteristics of graphitic carbon nanostructures in the form of coils in uneven amounts with the avarage diameter size is 24.9134 nm. In addition, the XRD characterization results also strengthen the characteristic phase of graphitic carbon nanostructures at 2θ 26.5° and 44.7°, although nanoparticles from Fe catalysis are visible in the sample due to the absence of reflux.

PENGENDALIAN LARVA NYAMUK Culex pipiens DENGAN EKSTRAK BIJI SRIKAYA (Annona squamosa L)

The Culex pipiens mosquito is one of the insects that carries diseases, especially filariasis. Mosquito control can be done using insecticides, either in the form of mosquito coils, electricity, or anti-mosquito lotion. However, the safety of insecticides on the market needs to be questioned because they contain chemicals. Therefore, alternative methods based on natural ingredients are needed, one of which is srikaya seeds. Therefore, this research was carried out to measure the biolarvicidal activity of sugar apple seed extract against Culex pipiens mosquito larvae. This research is an experimental study with treatment in the form of a concentration of srikaya seed extract, consisting of 0%, 3%, 6%, 9%, 12% and 15% with 3 repetitions. The data obtained was the average number of Culex pipiens mosquito larvae that died as a result of the treatment given. The percentage of larval death data was then calculated and the data was analyzed statistically using one-way anova with calculations using SPSS 23 software. The results of the study showed that differences in the concentration of sugar apple seed extract had a significant influence on the mortality of Culex pipiens mosquito larvae, where a concentration of 15% gave the highest average larval death. but not significantly different from concentrations of 12%, 9%, and 6%.

Метафора дыма: реконструкция культурных смыслов (на материале якутской лингвокультуры)

The paper examines the linguistic and cultural semantics of the Yakut word buruo (smoke) by exploring its metaphorical manifestations in vocabulary, phraseology, and folklore. The folklore text is analyzed using a structural-semiotic approach to examine language as a cultural verbal code. For the first time, the smoke metaphor is recognized as a source of riddles, proverbs, good wishes, incantations, euphemisms, and others. Otherwise, the metaphor is found to have meaning- and text-forming functions. In the Yakut linguoculture, the smoke metaphor creates a micro paradigm of linguistic units with the general semantics of “descendants, a continuation of the family.” The metaphor under study is suggested to be a cultural element of the Sakha people’s folklore, specifically related to the patriarchal family structure and the roles of sons and daughters in procreation. The smoke metaphor, a tool for creating new concepts and pictorial means in language and culture, proves to be an element of the informational structures of oral collective memory. It preserves the principle of patrilineage, gender stereotypes, and traditional ideas of the Sakha people about the succession of generations and procreation, understood as “development, advancement through stages of development.” A significant finding is that a polysemous word, phraseology, paremy, epithet, folklore formula, symbol, and others can preserve considerable information in a coiled form and serve as an optimal way of its oral transmission in time and space. To conclude, folklore text metaphors are not only emotionally rich but also involve “condensed” meaning, with a symbol representing the information compression.

Unraveling the potential of non-thermal ultrasonic contact drying for enhanced functional and structural attributes of pea protein isolates: A comparative study with spray and freeze-drying methods

The challenge of preserving the quality of thermal-sensitive polymeric materials specifically proteins during a thermal drying process has been a subject of ongoing concern. To address this issue, we investigated the use of ultrasound contact drying (USD) under non-thermal conditions to produce functionalized pea protein powders. The study extensively examined functional and physicochemical properties of pea protein isolate (PPI) in powder forms obtained through three drying methods: USD (30 °C), spray drying (SD), and freeze drying (FD). Additionally, physical attributes such as powder flowability and color, along with morphological properties, were thoroughly studied. The results indicated that the innovative USD method produced powders of comparable quality to FD and significantly outperformed SD. Notably, the USD-PPI exhibited higher solubility across all pH levels compared to both FD-PPI and SD-PPI. Moreover, the USD-PPI samples demonstrated improved emulsifying and foaming properties, a higher percentage of random coil form (56.2 %), increased gel strength, and the highest bulk and tapped densities. Furthermore, the USD-PPI displayed a unique surface morphology with visible porosity and lumpiness. Overall, this study confirms the effectiveness of non-thermal ultrasound contact drying technology in producing superior functionalized plant protein powders, showing its potential in the fields of chemistry and sustainable materials processing.

DEVELOPMENT OF A HIGH CAPACITY THREE HEADED COIL-SPOOL WINDING MACHINE

Cable packaging machines are machines that can automatically wrap long and thin materials such as wires, cables and pipes into regular packages. These machines play an important role in cable production and save time and labour in the production process. There are many types of cable packaging machines and they have different features, but in general, all of them ensure that the materials are wrapped in the correct size, tightly packed and transported quickly. In the machine designed and manufactured in this study, cables are packed in perforated spool, slotted spool and coil form. The system consists of 7 sections as unloader, traverse unit, dancer, cable winding heads, spool feeding, pliers group and main control panel. In the designed and manufactured machine, the number of cable winding heads was increased to 3 for the first time and the lost time during the cable winding process was minimized. In the research, the performance of the designed and manufactured machine was tested. As a result of the experiments, it was determined that the machine winds 10-12 coils/min at a cable length of 16,5-25 m and 4,5-5 spools/min at a cable length of 100 m.

Inductive sensor for measuring linear displacement and velocity – Version with stationary magnetic core

The article describes a displacement sensor designed and manufactured in the Rock Deformation Laboratory of the Strata Mechanics Institute of the Polish Academy of Sciences for cooperation with the GTA-10 triaxial cell. This sensor measures the displacement and velocity of the strength machine's piston.The sensor has the form of a single-layer induction coil made of spring steel with a fixed magnetic core cooperating with the LC oscillator. The coil elongates during measurement without friction, causing oscillation frequency changes, unlike the LVDT sensor, where core movements produce a voltage signal. In this way, a displacement-frequency transducer is realised.The presence of the core linearizes the transducer's displacement-frequency characteristic and increases its sensitivity in this case. Moreover, the core increases the inductance of the sensor, which allows the increase in the capacitance of the resonant circuit and thus, the stability of the oscillations, which are influenced by the parasitic capacitances of the connections. In this way, a resolution of the transducer of less than 500 nm was achieved, with a measuring range of 70 mm (relative resolution 105). The new inductive sensor replaced the resistance displacement sensor, which had been used previously.The article shows the mathematical background of the sensor functioning as a displacement-frequency transducer, its structure and examples of its application.

Mixing and demixing arising from compression of two semiflexible polymer chains in nanochannels.

We use molecular dynamics simulation to probe the non-equilibrium physics of two nanochannel-confined semiflexible polymers in a homogeneous flow field. We find that for sufficiently stiff chains the internal organization of the two chains takes the form of interwoven folds and circular coils. This organization can lead to mixing or demixing depending on chain stiffness and flow speed. At low and intermediate flow, the two chains adopt a folded configuration, which favours mixing. At high flow, the two chains adopt a predominantly coiled configuration. The coiled configuration results in demixing when the chains are compressed from an initially demixed condition and mixing when the chains are compressed from an initially mixed condition. We find that the mixing/demixing behaviour is governed by the ratio of the number of folded segments of one chain relative to the other at low flow and by the degree of coiling in both chains at high flow. For decreasing stiffness, the chains start to aggregate locally instead of mixing smoothly at low and intermediate flow. In the limit of completely flexible chains, the two chains either completely segregate at low flow, or adopt a locally demixed configuration consisting of large aggregates of one chain relative to the other that undergo complex stochastic dynamics, diffusing, disintegrating, and reforming at intermediate flow. The transition from complete segregation to the aggregate-dominated configuration occurs when the linear intra-chain ordering breaks down.

Coaxial-helix MXene/PANI-based core-spun yarn towards strain-insensitive conductor and supercapacitor

Stretchable electrical conductors hold great promise in the wearable electronic devices, such as flexible display and human-machine interface. Stable conductivity is vital for wearable devices to maintain their stable performance. However, the electrical resistance of most reported yarns dramatically increases when they are deformed. Herein, we propose a design for a coaxial-helix structure by wrapping the polyaniline/MXene-based elastic core-spun yarn on itself in the form of coils. The fabricated coaxial-helix structured yarns (DCSs) exhibit excellent strain-insensitive properties, including low relative resistance change (25.4%), large strain (200%) and high quality factor (17.95). Moreover, the DCSs can be used as the stretchable electrodes for the supercapacitors, and delivers a linear specific capacitance of 256.7 mF cm−1, which is higher than most stretchable yarns. Therefore, the proposed coaxial-helix structure design creates a new approach for the strain-insensitive stretchable conductor, thereby paving the way for the development of stretchy electronics.

BENTHIC FORAMINIFERAL MORPHOGROUPS AND TRACE FOSSILS FROM ALBIAN SHALLOW-MARINE MUDSTONE FACIES OF THE VIKING FORMATION, WESTERN INTERIOR SEAWAY, CANADA

ABSTRACT This study assesses the foraminiferal morphogroup concept as a quantitative tool for interpreting environments of deposition in the geological record. This was achieved by first establishing a solid paleoenvironmental framework based on assessment of trace fossils (Zoophycos, Cruziana, and Phycosiphon ichnofacies, and the unnamed brackish-water association), sedimentology, and facies analysis of shallow-marine siliciclastic units of the upper Albian Viking Formation of the Western Interior Seaway, Canada. Foraminiferal morphogroups were integrated into a framework of six well-defined marine mudstone-dominated facies—estuarine, embayment, prodelta, upper offshore, lower offshore, and marine shelf. Seven morphogroups were recognized, quantified, and labeled using alphanumeric codes—A (tubular), B1 (globular), B2 (coiled, flat), B3 (lenticular), C1 (elongate), C2 (quinqueloculine), and D (trochospiral). Tubular forms (A, Bathysiphon) occur rarely in these shallow-marine facies. Globular forms (B1, Lagenammina) are common in estuarine (33%) and embayment (23%) facies, but also occur elsewhere in low numbers (7–14%). Coiled planar forms (B2, Ammodiscus) occur only rarely (1–8%), but have a minor presence in embayment facies (8%). Lenticular forms (B3, Haplophragmoides) are dominant in estuarine facies (43%) and occur commonly in other environments (9–29%) as well. Elongate forms (C1, Ammobaculites, Reophax, Verneuilinoides) dominate all shallow-marine facies (43–80%), except estuarine (10%). Quinqueloculine forms (C2, Miliammina) have a minor presence in prodelta and marine facies (5%) but are generally rare. Trochoid forms (D, Trochammina) occur rarely, but are relatively common in the prodeltaic facies (15%). Albian foraminiferal morphogroups of the Viking Formation are comparable to those of modern-day offshore environments from water depths of 13 to 160 meters. Foraminiferal morphogroups are objective entities independent of taxonomic determinations. Analysis of their form and function is applicable not only in the shallow-marine facies of the Albian Western Interior Seaway, but in similar facies throughout the geologic record.

Investigation of the Temperature Field Distribution in an EI Type Iron-Cored Coil Using 3D FEM Modeling at Different Load Conditions

In this present paper, results for the temperature distribution in electromagnetic construction in the form of coil coupled with EI-type ferromagnetic core are presented. This construction is typical for small electric transformers (AC operation mode) or chokes—DC or AC operation mode. Investigation has been provided using 3D finite element method computer modeling at various load conditions to simulate power dissipation both in the coil and the core volumes. The results obtained were used to calculate overall thermal resistances toward ambient free air and the thermal resistance between the coil and the core. These results show the important role the thermal resistance between the coil and the core may play for both steady-state and transient device operation.

Optimization configuration of scrubber steel wire coils as porous materials for augmenting the performance of hemispherical distillers

BackgroundThe present study aims to improve the productivity of hemispherical solar distillers to overcome the problem of freshwater shortage facing many countries of the world, especially remote countries, due to population increase and climate changes. To achieve this goal, scrubber steel wire coils were incorporated in the basin of a hemispherical distiller as porous materials and energy store materials. To identify the best configuration of installation and form of scrubber steel wire coils that provides the highest thermal efficiency of hemispherical solar distillers (HSDs), two configurations were considered for installing and forming the scrubber steel wire coils inside the basin; spiral form and cake form. MethodsTo examine their performance experimentally, besides to a traditional HSD (THSD), two new HDSs, one containing spiral-shaped coils of scrubber steel wire (HSD-SSCSSW), and one HDS with cake-shaped coils of scrubber steel wire (HSD-CSCSSW) were constructed and studied under same climate weather conditions. Significant findingsOutcomes showed that the HSD-CSCSSW is the best configuration that provides the highest hemispherical distiller performance. Its distillate accumulation reached 7110 mL/m2, while THSD accumulation totaled 4830 mL/m2. The accumulation productivity of the HSD-CSCSSW is 1.472 times higher than the output of THSD. Outcomes proved that utilizing the scrubber steel wire coils in the shape of a cake is a good choice which augments the thermal and exergy efficiencies by 46.47 and 101.1%.

A Mini Review on Working Mechanism, Standard Operating Procedure (SOP) and Preventative Maintenance of Low Temperature Long Term (LTLT) Milk Pasteurizer

A small-scaled batch Low Temperature- Long Term (LTLT) pasteurizer is one of many types of pasteurizers that is being utilized in food-based industries particularly in dairies. It has a capacity of heating up the milk and holding the temperature for a certain amount of time to kill pathogenic microorganisms. The instantaneous heat up is caused by heat exchangers either in the form of plates or metal coils depending on the machine. The coil is circulated within the jacket of the tank where it heats up and holds the temperature. Hot water circulation will be in continuous movement around the milk to heat it up and maintain the desired temperature. After certain period, the efficiency of LTLT pasteurizer starts declining due to cumulated issues. Decline in efficiency will affect the output of the machine too. Instantaneous heat exchanges, leaking, unstable pressure and electrical problem degrades the machine over period if it is not complying with Standard Operating Procedure (SOP) and a proper Preventative Maintenance (PM) plan. The SOP and PM will increase the machine’s lifespan and maintain a good efficiency rate for longer period. This mini review paper will compile the possible PM plan and establish a sustainable SOP for the LTLT Pasteurizer.

Highly Elastic and Conductive Metallic Interconnect with Crystalline–Amorphous Nanolaminate

Nanolaminate with alternating layers of nanocrystalline Cu and amorphous CuZrTi is suggested as highly stretchable and conductive interconnect material in stretchable devices. 50 nm nanocrystalline Cu and 20 nm amorphous CuZrTi are the optimum thicknesses of the constituent layers, which result in an elastic deformation limit of 3.33% similar to that of the monolithic amorphous CuZrTi film and an electrical conductivity of 11.83 S/μm corresponding to 70% of that of the monolithic nanocrystalline Cu film. The enhanced elastic deformability and conductivity of the nanolaminates enable the maintenance of the interconnect performance for cyclic stretching with a tensile strain of 114% in the form of a free-standing serpentine structure and a tensile strain of 30% in the form of an ordinary circular coil on an elastomer substrate.

Variable inductive shape memory spring based multifunctional module for high sensitivity measurements

Shape memory elements as sensing units have promising potential; the prospect of using shape memory alloy coil as a multi-functional module using the inductive principle is assessed in this work. The self-sensing phenomenon in SMA is dominantly explored from the change in electrical resistance, however, the same can be realized from the variation in inductance in its coiled form. This article introduces a unique, variable inductive sensing system using an SMA spring for high sensitivity measurements, performance of which greatly relies on its coil geometry and permeability. The configuration enables the sensing operation at an isothermal condition for testing force, displacement, and as a proximity sensor. Experimental verification of the proof-of-concept for sensitivity enhancement reveals that adding an iron core results in a sensitivity of 0.1 μH/0.1 N and 0.16 μH/mm, for force and displacement sensing respectively which is a twofold increase over the system's sensitivity with an air core.