Multiple Tapes Research Articles

Transverse resistance variations in helically wound 2G ReBCO high-temperature superconducting tape with core under transverse cycling and bending loads

The variations in normalized transverse resistance of 2G HTS tape in a helically wound configuration with the core were measured at room temperature (RT) and 77 K under transverse cyclic and three-point bending loads. The observed experimental phenomena were explained by considering the differences in gap sizes between the superconducting tape and copper core, as well as between the superconducting tapes when multiple tapes are wound during sample preparation and cooling. By analyzing the impact of winding parameters, we offer engineering recommendations to mitigate the increase in transverse resistance and enhance the bearing ability of superconducting tapes under transverse cyclic and three-point bending loads at 77 K. These recommendations include augmenting pre-tension during the winding process, reducing sample placement time before testing, increasing the copper core radius and winding angle, as well as reducing the number of winding tapes.

Analysis and tests of non-uniform wrapping process of tape spring

A tape spring, which has a high ratio of retraction and deployment, is a type of basic deployable member that plays an important role in deployable structures. This paper is focused on the non-uniform wrapping process of a tape spring that the fixed end section preserves the initial shape. A theoretical method is presented to predict the non-uniform wrapping process of a metallic tape spring based on classical theories about the bending behavior of this type of tape spring. There are two possible shapes for a tape spring after the non-uniform wrapping process, namely a polygon or a continuous curve. The boundary lines of the two possible shapes are studied, and it is shown that the shape depends on the radius of the central cylindrical hub. A finite element model is built using the commercial software ABAQUS to verify the reliability of the theoretical model. Experimental measurement is also conducted to record the shape change process of a tape spring. The comparisons of the results of the three different methods show that they are in good agreement with each other, which means that the theoretical model can be used to predict the non-uniform wrapping behavior of the tape spring. Additionally, the behavior of four tape springs during the non-uniform wrapping process is studied, and the results show that the shapes of multiple tape springs in a coiled state correspond to that of a single tape spring.

Ultra-fast Consolidator Machine Development – Individualized Mass Production of Thermoplastic Tailored Blanks based on Laser-assisted Tape Placement with in-situ Consolidation

The new UItra-Fast Consolidator Machine development offers both high flexibility and mass production of tailored thermoplastic laminates with reduced scrap. The machine system can be configurated to achieve fully consolidated multi-layer laminates with different fiber directions and minimized scrap (thermoplastic tailored blanks) produced in cycle times below 5 seconds. This individualized mass production is accomplished by a combination of laser-assisted tape placement with in-situ consolidation and a piece-flow principle, which is state of the art in the printing industry but has not been used in such a way within composite production. The achievable productivity is enhanced to more than 500 kg/hour by this piece-flow principle with carriers moved through multiple application stations which are equipped with multiple tape placement applicators. The new machine is scalable: multiple application stations can be added, e.g. for each layer one station for mass production or for each fiber direction one station with a carrier-conveyor carousel: here the carriers are moved multiple times through the application stations.
 This innovative machine system is a result of an 18-months AZL Joint Partner Project, conducted in 2017-2018 by the research partners AZL Aachen and Fraunhofer IPT Aachen, in cooperation with 12 industrial partner companies including Conbility, Covestro, Engel, Evonik, Fagor Arrasate, Faurecia SE, Laserline, Mitsui Chemicals, Mubea Carbo Tech, Philips Photonics, SSDT and Toyota (in alphabetical order). The system won the international JEC Innovation AWARD 2019 in the category “Industry & Equipment”.

Verification of Composed Web Service Using Synthesized Nondeterministic Turing Model (SNTMM) With Multiple Tapes and Stacks

To verify the composed web services, a general view of what traits of a service need to be identified is still lacking. The existing verification model did not address any mechanism for getting alternative services if we failed to reach the desired service and partially concentrated on the reachability problem for a deterministic and non-deterministic system in sequential. This paper proposes a synthesised non-deterministic turing machine model (SNTMM) by combining the multistacked non-deterministic Turing machine (MSNTM) model and multitaped non-deterministic Turing machine (MTNTM) model to verify the composed web services for both deterministic and non-deterministic systems in parallel. The deceased transition and departed service marking algorithm have been proposed to address each participated service's reachability in composing service for all possible input in parallel. This article shows an example to demonstrate the meticulousness of the model. The experimental results show that the performance of the proposed model is measured efficiently.

Modification for helical turbulator to augment heat transfer behavior of nanomaterial via numerical approach

Energy demand makes a noteworthy concern in these days. In engineering fields, heat exchangers were utilized for cooling purpose and to improve the efficiency, tapes with various configurations can be installed. Utilizing multi helical tape (MHT) is main purpose of current context. In current turbulent simulation, transportation of nanomaterial within a tube has been scrutinized. To augment flow blockage, helical tape (HT) was employed with various width ratio (BR). Multiple tapes make the flow more disturber and increase the resistance. Widths of MHT and inlet velocity were supposed as main variables and outputs were illustrated in view of contours and bar charts. Due to increase of velocity gradient, Sgen,f (frictional entropy) increases by about 58.9% with augment of width of tapes. The increased Sgen,f with augment of Reynolds number (Re) is attributed to greater secondary flow with augment of pumping power. Reduction of temperature of wall with rise of width of tapes results in higher Nusselt number. Moreover, Nusselt number (Nu) for maximum inlet velocity is around 2.3 times greater than that of minimum inlet velocity. Sgen,th (thermal irreversibility) reduces about 89.95% with augment of pumping power at BR = 0.098. Lower surface temperature causes exergy drop to decline as a result of augmenting in Re.

Evaluation and improvement of protein extraction methods for analysis of skin proteome by noninvasive tape stripping

Analysis of the human skin proteome is key to understand molecular mechanisms maintaining health or leading to diseases of this important organ. For minimal invasive sampling of skin proteomes, the use of self-adhesive tape strips has been successfully applied. However, the methods previously presented were evaluated on different types of skin samples (e.g. healthy, diseased) and used a variety of cell lysis/protein extraction methods, which renders a systematic comparison and thus the identification of the most efficient protocols difficult.Here, we present a study comparing five different approaches for cell lysis and protein extraction from single tape strip biopsies. Extraction using a detergent mix or 1% SDS proved to be most efficient. Further, we replaced protein precipitation by single-pot, solid-phase-enhanced sample preparation (SP3), which strongly enhanced the number of identified proteins. This fully LC-MS compatible methodology provides a fast and reproducible approach for minimal invasive sampling of human skin proteomes. Biological significanceFast and reproducible minimal invasive sampling of human skin proteomes is a major prerequisite for clinical proteomics studies aiming to decipher molecular mechanisms involved in the homeostasis as well as in the development of diseases. By optimization of tape strip sampling, e.g. the introduction of SP3 sample cleanup prior to LC-MS analysis, the presented protocol leads to yet not reported numbers of protein identifications from healthy human skin. Further, due to its efficiency it allows analysis from minimal sample amounts, e.g. from single tape strips, while established protocols relied on pooling of multiple tape strips. This provides the opportunity to perform spatially (lateral) resolved proteome analyses from different depths of the skin by analysis of consecutive strips.

Competition between delamination and tearing in multiple peeling problems.

Adhesive attachment systems consisting of multiple tapes or strands are commonly found in nature, for example in spider web anchorages or in mussel byssal threads, and their structure has been found to be ingeniously architected in order to optimize mechanical properties: in particular, to maximize dissipated energy before full detachment. These properties emerge from the complex interplay between mechanical and geometric parameters, including tape stiffness, adhesive energy, attached and detached lengths and peeling angles, which determine the occurrence of three main mechanisms: elastic deformation, interface delamination and tape fracture. In this paper, we introduce a formalism to evaluate the mechanical performance of multiple tape attachments in different parameter ranges, where an optimal (not maximal) adhesion energy emerges. We also introduce a numerical model to simulate the multiple peeling behaviour of complex structures, illustrating its predictions in the case of the staple-pin architecture. Finally, we present a proof-of-principle experiment to illustrate the predicted behaviour. We expect the presented formalism and the numerical model to provide important tools for the design of bioinspired adhesive systems with tuneable or optimized detachment properties.

Weaker variants of infinite time Turing machines

Infinite time Turing machines represent a model of computability that extends the operations of Turing machines to transfinite ordinal time by defining the content of each cell at limit steps to be the \(\limsup \) of the sequences of previous contents of that cell. In this paper, we study a computational model obtained by replacing the \(\limsup \) rule with an ‘eventually constant’ rule: at each limit step, the value of each cell is defined if and only if the content of that cell has stabilized before that limit step and is then equal to this constant value. We call these machines weak infinite time Turing machines (wITTMs). We study different variants of wITTMs adding multiple tapes, heads, or bidimensional tapes. We show that some of these models are equivalent to each other concerning their computational strength. We show that wITTMs decide exactly the arithmetic relations on natural numbers.

Implementing Strategies to Identify and Mitigate Adverse Safety Events: A Case Study with Unplanned Extubations

Patient safety events result from failures in complex health care delivery processes. To ensure safety, teams must implement ways to identify events that occur in a nonrandom fashion and respond in a timely manner. To illustrate this, one children's hospital's experience with an outbreak of unplanned extubations (UEs) in the neonatal ICU (NICU) is described. The quality improvement team measured UEs using three complementary data streams. Interventions to decrease the rate of UE were tested with success. Three statistical process control (SPC) charts (u-chart, g-chart, and an exponentially weighted moving average [EWMA] chart) were used for real-time monitoring. From July 2015 to May 2016, the UE rate was stable at 1.1 UE/100 ventilator days. In early June 2016, a cluster of UEs, including four events within one week, was observed. Two of three SPC charts showed special cause variation, although at different time points. The EWMA chart alerted the team more than two weeks earlier than the u-chart. Within days of discovering the outbreak, the team identified that the hospital had replaced the tape used to secure endotracheal tubes with a nearly identical product. After multiple tape products were tested over the next month, the team selected one that returned the system to a state of stability. Ongoing monitoring using SPC charts allowed early detection and rapid mitigation of an outbreak of UEs in the NICU. This highlights the importance of continuous monitoring using tools such as SPC charts that can alert teams to both improvement and worsening of processes.

Optimised trajectory calculation for the automated layup of wide lightning protection tapes on double-curved fuselage sections

Lighting strike protection is not intrinsically provided on modern composite built aircraft due to the lower electrical conductivity of composite materials. A highly conductive copper foil is manually applied onto the fuselage in multiple overlapping tapes. Known automation processes are not adequate for wide tapes particularly in the case of large double-curved surfaces. One key technology for enabling an automated process is tape trajectory generation with a focus on automation constraints. We are introducing a new tape application mechanism for a single wide tape. Our algorithm generates geometry induced layup trajectories, taking into account geometric conditions. We experimentally demonstrate a wrinkle-free automated application. Based on the first algorithm, a second algorithm addresses the challenging issue of an optimised surface coverage with multiple tapes for a fuselage section. A tape application fitness criterion is defined and implemented. We point out that a computer-based algorithm is advantageous for determining the proper arrangement of multiple tapes. It is thus now possible to create a multiple tape design that can be applied with an automation process. In addition, the optimisation leads to a reduction of consumed and wasted tape material in the fuselage production process.

Experimental Study of the New Type of HTS Elements for Current Leads to be Applied to the Nuclear Fusion Devices

This paper describes new kind of HTS (High Temperature Superconducting) element for current leads, which can transfer large electric current in the nuclear fusion system. Since the HTS tapes have no resistance and the generated Joule heat is also very small compared to the conventional current leads, cooling costs of the current leads can be reduced. For this reason, the various feasibility researches for HTS current leads have been promisingly progressed in the superconducting power applications. However, there is a limitation on the capability of current carrying for single HTS tape. In addition, the cross-sectional area of the current leads should be small enough to minimize the heat conducted through the HTS current leads. In order to improve the current carrying capacity of the current leads, multiple HTS tapes are required. In this paper, we proposed several structures of compact HTS current leads and compare them other 2 kA class current leads. We report on the calculated characteristics of stabilized HTS current leads and on the performance measured during critical current measurement tests.

Novel Imaging Method to Quantify Stratum Corneum in Dermatopharmacokinetic Studies

Tape stripping the stratum corneum (SC) is used in topical bioequivalence studies. Formulations are compared using drug concentration profiles as a function of relative SC position; both of these parameters require quantification of SC amount removed per tape. Here, a novel imaging method to quantify SC on tape strips is described. Comparisons are made with established SC quantification methods, specifically weighing and UV pseudo-absorption. Six stratum corneum tape strips were measured 15 times by the three methods, which were compared for precision, signal:noise ratio, sample size and speed. Furthermore, 600 tape strips were assayed by each method, and correlations examined. Weighing exhibited low precision, extremely low signal:noise ratio, and was slow. UV pseudo-absorption had high precision, acceptable signal:noise ratio and was quick. However, only a fraction of the total SC removed is analysed, and inhomogeneity can affect the results. The new imaging method was precise, with high signal:noise ratio, and measured the whole SC sample, unaffected by inhomogeneity. In addition, the approach was rapid and has the potential for fast automated scanning of multiple tapes and for further image analysis. The novel imaging method has many advantages over established methods for quantifying SC amount per tape.

Current Distribution in YBCO Coated Conductors of Toroidal Coil Composed of Multiple Double Pancake Coils

We should prevent non-uniform current distribution due to manufacturing errors of tape size, coil size, and conductor deformation in the toroidal coil composed of multiple YBCO double pancake coils. This is because the non-uniform current distribution causes the increase of AC losses and the decrease of critical current in the YBCO tapes. Therefore, we analytically investigated the relationship between the manufacturing error and the current distribution in the toroidal coils composed of the eight series-connected double pancake coils composed of the transposed conductor with two parallel-connected YBCO tapes and the eight sets of two parallel-connected double pancake coils composed of single YBOC tape conductor connected in series. The parallel-connected multiple double pancake coils composed of single tape conductor is much more effective for preventing the non-uniform current distribution than the double pancake coil composed of the transposed conductor with parallel-connected multiple tapes. The non-uniformity of current distribution can be improved by increasing the length of parallel-connected current path by increasing the number of series-connected double pancake coils in each current path.

Suitable Method for Increasing Current Carrying Capacity of HTS Toroidal Coils for SMES and DC Reactor

Non-uniform current distribution in a conductor composed of multiple HTS tapes is one of the important problems for increasing current carrying capacity of a large-scale coil system such as Superconducting Magnetic Energy Storage (SMES) and DC reactor. We focused on a manufacturing error in the HTS tape thickness and analytically investigated the relationship between the manufacturing error and the non-uniform current distribution. Even in a transposed conductor, the non-uniform current distribution is easily occurred by a small error in the tape thickness due to high coupling constant among the tapes. The non-uniformity of the current distribution reduces the current carrying capacity. However, the non-uniform current distribution can be improved by adopting a pancake coil with a large radius and small number of turns. An HTS tape with large thickness is also effective for reducing the non-uniformity of current distribution. Adopting parallel double pancake coils composed of single HTS tape is one of the promising candidates for increasing current carrying capacity effectively without any problems of the non-uniform current distribution. The suitable connecting method among the parallel double pancake coils for uniform current distribution, however, should be developed.

The Application of Cognitive-Behavioral Therapy for Psychosis in Clinical and Research Settings

This study compared the practice of cognitive-behavioral therapy (CBT) for psychosis across research and routine clinical settings. An observer-rated adherence measure was used to compare the content of 40 therapy sessions of clients with positive psychotic symptoms. Twenty therapist-client dyads came from a research setting in the United Kingdom and 20 from three clinical settings, two in the United Kingdom and one in the United States. In the research setting CBT was provided by research clinical psychologists and trained local therapists. In the clinical settings CBT was part of a case management service by trained therapists. Therapist adherence to CBT for psychosis did not differ between the research and clinical settings. However, clinicians in the research settings scored significantly higher on items for schema work (z=-1.98, p<.05), relapse prevention interventions (z=-2.08, p<.05), and formulating a model of relapse (z=-2.61, p<.01). CBT for psychosis conducted in clinical settings was more strongly characterized by assessment of symptoms and work on coping strategies and less so by relapse prevention and schema-level work. Relapse prevention interventions and schema work could be considered more challenging for therapists to undertake. The findings suggest that therapists working in routine clinical settings are able to establish good therapeutic relationships with people with psychosis and to work on assessing and coping with their psychotic symptoms. However, some therapeutic approaches may be more challenging in this context.

Numerical Study on AC Transport Current Loss Measurement of HTS Assembled Conductor by Pick-Up Loop Without Electrical Contacts

Numerical studies on a AC transport loss measurement method for assembled conductors of multiple HTS tapes in multi-layer polygonal arrangement by using a spiral pick-up loop without electrical contacts are presented in this paper. The previously developed numerical model to analyze the electro-magnetic field distribution and the AC loss in the HTS tape in the polygonally assembled conductor was modified. The AC loss measurement using the spiral pick-up loop for single and multi layered polygonal conductors assembled by this HTS tapes was numerically simulated. The detection properties of the AC transport loss by the spiral pick-up loop were evaluated and the validity of this measurement method was verified.

Numerical Analysis of AC Loss Characteristics of Cable Conductor Assembled by HTS Tapes in Polygonal Arrangement

Numerical studies on AC loss characteristic of a assembled conductors of multiple HTS tapes with high aspect ratio simulating YBCO tape in polygonal arrangement were presented in this paper. We developed a numerical model to analyze the AC loss in the HTS tape in the polygonally assembled conductor based on our previously developed model. The relations between the geometrical configuration and the AC loss properties of the conductor were made clear by the numerical simulation. The numerical results give the important information for the design of the cable conductor assembled by the HTS tapes with high aspect ratio such as YBCO tapes

Heavy Water Labeling of Keratin as a Non-Invasive Biomarker of Skin Turnover In Vivo in Rodents and Humans

Measurement of skin turnover has been problematic in humans. Heavy water (2H2O) labeling has recently been developed as a safe, simple method to study in vivo kinetics of many biosynthetic processes, including DNA and protein synthesis. Here, we apply this approach to the measurement of 2H incorporation into skin keratin and show close agreement between keratin and keratinocyte turnover data in the epidermis of rodents. Elevated turnover rates of both keratin and keratinocytes were observed in the epidermis of the flaky skin mouse, although topical treatments effective in human psoriasis had no effect on either turnover rate in these mice. In humans, keratin turnover was monitored non-invasively by serial tape stripping during and after 2H2O labeling. Kinetic data were consistent with previous estimates of epidermal turnover, with a lag time of 18 days before label appeared at the skin surface and a transit time of 4-5 weeks. Variability in skin keratin turnover rates was present among healthy individuals. In summary, 2H2O labeling of skin keratin represents a non-invasive approach for assessing skin turnover dynamics in pre-clinical models and in human subjects.

Optimal Scheduling Algorithms for Tertiary Storage

The ever growing needs of large multimedia systems cannot be met by magnetic disks due to their high cost and low storage density. Consequently, cheaper and denser tertiary storage systems are being integrated into the storage hierarchies of these applications. Although tertiary storage is cheaper, the access latency is very high due to the need to load and unload media on the drives. This high latency and the bursty nature of I/O traffic result in the accumulation of I/O requests for tertiary storage. We study the problem of scheduling these requests to improve performance. In particular we address the issues of scheduling across multiple tapes or disks as opposed to most other studies which consider only one or two media. We focus on algorithms that minimize the number of switches and show through simulation that these result in near-optimal schedules. For single drive libraries an efficient algorithm that produces optimal schedules is developed. For multiple drives the problem is shown to be NP-Complete. Efficient and effective heuristics are presented for both single and multiple drives. The scheduling policies developed achieve significant performance gains over naive policies. The algorithms are simple to implement and are not restrictive. The study encompasses all types of storage libraries handling removable media, such as tapes and optical disks.

Mechanical properties and in vitro cell compatibility of hydroxyapatite ceramics with graded pore structure

In order to improve the mechanical strength of hydroxyapatite (HA) ceramics used as osteoimplants and to enhance cellular penetration functionally graded ceramics with a transition in porosity from the surface towards the centre were designed. The multilayer structures were prepared by multiple tape casting based on an aqueous HA slurry containing polybutylmethacrylate (PBMA) spheres with diameters ranging from 100 to 300 μm. After burning out the PBMA, pores of 70–200 μm were generated. The pore-graded laminates were sintered at temperatures between 1250°C and 1450°C. Bending strength of the pore-graded ceramics was approximately 50% higher as compared to HA of the same pore volume fraction but without gradient structure. The materials were tested in vitro for attachment and activity of osteoblast-like MC3T3-E1 cells over a period of 3 weeks. Cells formed confluent layers on the ceramic surface, penetrated into the graded porosity ranging from 100–150 μm to 250–300 μm in size and showed increasing alkaline phosphatase activity over 3 weeks. The results demonstrated initial in vitro cell compatibility of the functionally graded HA materials and their potential as osteoimplants.