'Like-With-Like’: A Comparison of Natural and Synthetic Stitching Threads used in Textile Conservation

This paper reports research undertaken to investigate thread types used in textile conservation by quantitatively evaluating tensile strength and damage to conserved samples. A literature review and questionnaire sent to textile conservators were used to establish the most commonly used threads for laid-thread couching treatments and the rationale behind thread choice. Most common threads found were two-ply hair silk and polyester Tetex as well as other fine polyester, silk and cotton varieties. Three natural fibre plain-weave artefact samples conserved by laid-thread couching with five different thread types (lace cotton, hair silk, organsin, Skala and Tetex) were subjected to either tensile strength testing or a fixed-load experiment for two weeks. The tensile strength tests determined that the conservation treatment provided effective support and different thread types did not give statistically different results. The fixed-load experiment determined that longer time periods created more damage, even with lighter loads

R friendly multi-threading in C++

Calling multi-threaded C++ code from R has its perils. Since the R interpreter is single-threaded, one must not check for user interruptions or print to the R console from multiple threads. One can, however, synchronize with R from the main thread. The R package RcppThread (current version 0.5.3) contains a header only C++ library for thread safe communication with R that exploits this fact. It includes C++ classes for threads, a thread pool, and parallel loops that routinely synchronize with R. This article explains the package's functionality and gives examples of its usage. The synchronization mechanism may also apply to other threading frameworks. Benchmarks suggest that, although synchronization causes overhead, the parallel abstractions of RcppThread are competitive with other popular libraries in typical scenarios encountered in statistical computing

A Radio Polarimetric Study of the Galactic Center Threads

Multi-frequency, polarimetric VLA observations of the non-thermal filaments (NTF's), G0.08+0.15, and G359.96+0.09, also known as the Northern and Southern Threads are presented at 20, 6, 3.6 and 2 cm, with high enough spatial resolution to be resolved for the first time at 6 and 3.6 cm. The 20 cm image reveals a wealth of new detail in the radio sources lying within the inner 60 pc of the Galaxy. The Southern Thread has a prominent split along its length, similar to splitting at the ends of previously studied NTF's. With resolutions as fine as 2'', the 3.6 and 6 cm images reveal a high degree of continuity and little substructure internal to the filament. The spectral index of the Northern Thread has been determined over a broad range of frequencies. Its flux density falls with frequency, alpha=-0.5 between 90 and 6 cm, and becomes much steeper (alpha=-2.0) between 6 and 2 cm. The spectral index does not vary significantly along the length of the Northern Thread, which implies either that the diffusion timescale for the emitting electrons is less than their synchrotron lifetime, or that the emitting electrons are reaccelerated continuously at multiple positions along the filament. Because of the lack of spectral index variation, we have not located the source of relativistic electrons. Polarization observations at 6 and 3.6 cm confirm the non-thermal nature of the emission from the Northern Thread. The fractional polarization in the Northern Thread reaches 70% in some regions, although the polarized emission is patchy. Large rotation measures (RM > 2000 rad/m2) have been observed with irregular variations across the filament.The intrinsic magnetic field in the Northern Thread is predominantly aligned along its long axis.Comment: 19 pages, incl. 24 figs; to appear in the Astrophysical Journa

Well-Structured Futures and Cache Locality

In fork-join parallelism, a sequential program is split into a directed acyclic graph of tasks linked by directed dependency edges, and the tasks are executed, possibly in parallel, in an order consistent with their dependencies. A popular and effective way to extend fork-join parallelism is to allow threads to create futures. A thread creates a future to hold the results of a computation, which may or may not be executed in parallel. That result is returned when some thread touches that future, blocking if necessary until the result is ready. Recent research has shown that while futures can, of course, enhance parallelism in a structured way, they can have a deleterious effect on cache locality. In the worst case, futures can incur $\Omega(P T_\infty + t T_\infty)$ deviations, which implies $\Omega(C P T_\infty + C t T_\infty)$ additional cache misses, where $C$ is the number of cache lines, $P$ is the number of processors, $t$ is the number of touches, and $T_\infty$ is the \emph{computation span}. Since cache locality has a large impact on software performance on modern multicores, this result is troubling. In this paper, however, we show that if futures are used in a simple, disciplined way, then the situation is much better: if each future is touched only once, either by the thread that created it, or by a thread to which the future has been passed from the thread that created it, then parallel executions with work stealing can incur at most $O(C P T^2_\infty)$ additional cache misses, a substantial improvement. This structured use of futures is characteristic of many (but not all) parallel applications

Liquid Thread Locking Solution for Machinery Assembly Industry

Anaerobic liquid thread locking adhesives perform where mechanical fasteners fail. Just as snow tires grip the snowy track, liquid thread locking adhesives help fastener threads grip reliably. Based on anaerobic technology, these machinery adhesives do what mechanical methods had been designed to do but could not fulfill; they completely fill up the gap between the interfacing threads. Bolts secured with liquid thread locking adhesives retain clamping force better than mechanical fasteners not only reliably but also economically. A special nut or washer can cost up to five times as much as a liquid thread locking adhesive that reduces the cost of inventory, too

Studi Tentang Kerajinan Sulaman Benang Emas di Nagari Saniangbaka Kecamatan X Koto Singkarak Kabupaten Solok

Gold thread embroidery craft is one of the craft in Saniangbaka villages that have economic value and beauty value which has been handed down and done by women. The purpose of this study was to describe the shape of motifs of gold thread embroidery, materials used for gold thread embroidered, techniques of gold thread embroidery, and types of gold thread embroidery products. This study uses qualitative method. The type of data is primary and secondary data. The technique of collecting data through observation, interview and documentation. The data analysis technique which uses interactive model analysis that is related with subject matter is data reduction model, data presentation, and conclusion. The results of the study are: Shape of gold thread embroidery motifs derived from the naturalistic form of plants and animals, such as florals, leaves, twigs, chicken, bird, and geometric such as triangles, rectangles, circles, from then on stylized motifs into decorative ornament. Materials used are velvet, satin, gold embroidery threads, sewing machine thread, and needles for hand embroidery. Gold thread embroidery techniques in Saningbaka villages use pamedangan legged, namely gold thread laid on the surface of the fabric and embroidered motif followed by way of regular sewing thread pinned gold thread, gold thread embroidery characteristic in this Saniangbaka villages its motive is always full with gold threads, is not only the edge of motive, called the Or nu\u27e techniques. Gold thread embroidery products in Saniangbaka villages produced is for custom fixtures and traditional wedding, while products such as wall hangings, clothing, tablecloths, pillowcases seats, and souvenirs in the form of purses, bags and toys key is a special order from the buyer , is expected to yield gold thread embroidery is to improve the economy and can be preserved

The Puzzle of the Constitutional Home

The home enjoys a special place in American constitutional law. A doctrinal thread runs across the first five amendments that demarcates the home as a realm in which rights enjoy elevated protection. That thread covers rights involving smut, guns, soldiers, searches, and self-incrimination, but inexplicably does not extend to takings. This stark dichotomy between the solicitude of the home for most rights and the opposite for takings produces a deep puzzle.This Article contends that the answer to this fundamental puzzle is that the Court’s takings doctrine, unlike the home-centric doctrines in the Bill of Rights, is infected with post-Lochner v. New York judicial deference to economic regulation. This has influenced the Court’s aversion to a special protections doctrine to homes under the Takings Clause. This Article argues that, as a matter of constitutional coherence theory, which prizes doctrinal symmetry and harmony, the Court should, in limited circumstances, extend the home-centric thread to protect homes in takings that expropriate title to or impact the economic value of homes.This Article also grapples with several broader methodological, doctrinal, and theoretical implications. First, the Court consistently applies atextual methods of interpretation of the home. Second, this atextual interpretive pattern of influence supports this Article’s proposition that the home-centric doctrinal thread should extend to takings. Finally, a congruent home-centric Bill of Rights that extends to takings aligns neatly with constitutional coherence theory

An open structural operational semantics for an object-oriented calculus with thread classes

In this report we present a multithreaded class-calculus featuring \emph{thread classes.} From an observational point of view, considering classes as part of a component makes instantiation a possible interaction between component and environment or observer. For thread classes it means that a component may create external activity, which influences what can be observed. The fact that cross-border instantiation is possible requires that the \emph{connectivity} of the objects needs to be incorporated into the semantics. We extend our prior work not only by adding thread classes, but also in that thread names may be \emph{communicated,} which means that the semantics needs explicitly account for the possible acquaintance of objects with threads. This report formalizes a calculus featuring thread classes, i.e., its syntax, type system, and operational semantics. We furthermore discuss observational aspects of thread classes

A Multilevel Investigation of Participation Within Virtual Health Communities

Virtual health communities are a major channel through which health consumers share health-related knowledge and/or exchange social support with their peers. These virtual environments can be a form of, or a potential component of, integrated Patient-centered e-Health (PCEH) applications, which represent emerging healthcare information systems that emphasize the role of patients and revolve around providing patient-focus, patient-activity, and patient-empowerment services. Because of the collaborative nature of virtual health communities, user participation is a critical factor for community growth and prosperity. In this study, we examine user participation at the individual and group (thread) levels. At the individual level, we investigate the impact of reciprocity and homophily (similarity of user characteristics such as age, gender, and tenure) on user participation within virtual health communities. At the thread level, we study the role of highly active users (power users) as thread initiators as well as the role of thread initiators’ participation on the overall thread vibrancy. To do so, we analyzed 2,176 threads initiated by 130 users and 1,947 messages exchanged between these users and their peers. Our results support short-term reciprocity, but refute the positive relationship associated with long-term reciprocity. Among homophily hypotheses, our results support gender homophily, but not age or tenure homophily. At the thread level our findings suggest that a discussion thread is vibrant if the thread initiator is a power user or participates actively within the thread. These findings have important implications for future research and practice in PCEH applications

RANCANG BANGUN MODIFIKASI DRAWBAR MESIN FREIS ACIERA TIPE F4 AGAR EFISIEN UNTUK MENDUKUNG PRAKTIKUM DI LABORATORIUM PEMESINAN

A milling machine is a machine tool that is in the process of cutting work by cutting the workpiece using a rotating multi-edged cutting tool. The drawbar is part of the milling machine which is useful for attaching a collet adapter or cutter arbor short to the spindle cone hole of the milling machine. The adapter collet can be attached to the milling machine spindle cone hole due to the bonding between the outer thread at the end of the drawbar and the inner thread in the adapter collet through the drawbar tightening resulting in a tensile force. If the procedure for removing the collet adapter is in a state where the threads are not bonded to each other, then wear often occurs starting from the end of the drawbar thread profile winding to the thread profile winding. If this happens then the drawbar replacement must be done, the drawbar available in the market has a complete design from the head to the end of the thread. The purpose of this research is to design and modify the drawbar design into two parts, where the methods used are design, manufacture, and testing. The results obtained are the drawbar by modifying the length with 2 parts, the drawbar can operate properly and the outer diameter of the thread does not suffer for 8 weeks or the equivalent of 448 hours