Miracle-dz/UniFAR-FTUs huggingface dataset:
Development of a Nondestructive Testing Technique to Determine Flaw Criticality

Abstract : The report presents the findings of a study to develop a nondestructive testing technique to determine flaw criticality based upon stress-wave emission. The research included an evaluation of various sensors and instrumentation systems, and several materials and material conditions tested to failure in rising load and low-cycle, high-stress-intensity fatigue. The fracture testing utilized a linear-elastic fracture-mechanics approach. Acoustic emission was the basis of the nondestructive inspection technique. The stress-wave-analysis technique (SWAT) was shown to be a highly sensitive nondestructive inspection method, capable of detecting growing defects at least an order of magnitude smaller than any other known NDI method and, with a computerized system, capable of locating one or more defects in real time.
Compositional Effect on Thermal Properties and Opportunities of Milk Powder Stickiness Phenomena

Stickiness in the production of food powders can cause low yield, operational problems of equipment, powder-handling problems and fire hazards. It may result from the appearance of attractive forces between particles including static electricity. Stickiness in food systems often appears when the surface viscosity of amorphous particle components decreases and particles adhere. Increasing adhesion forces between particles causing stickiness and caking depends on the material properties, storage and processing conditions. Stickiness is a serious problem in spray drying of sugar-rich and fat-rich products, such as milk and juice. Solids composition affects structure formation and changes of foods during processing and storage. Powders containing high sugar contents show high adhesion of powder particles with increasing temperatures and water contents as a result of surface plasticization and the formation of liquid bridges. The stickiness of milk powders resulted from liquid flow of amorphous non-fat solids components, such as lactose and other hydrophilic components. They are plasticized by water, which is one of the dominant factors that control glass transition of amorphous solids. Glass transition is relation to stickiness and the SPT at 20 °C above the Tg. Increasing molecular mobility of molecules occurs above glass transition with concomitant appearance of viscous liquid-like characteristics, which are relative to the development of stickiness in amorphous particles. Although several researchers have indicated the relationships of stickiness and glass transition, the relaxation times and molecular mobility still remain as challenging areas in the glass transition research. Increased molecular mobility is related to decreased relaxation times and a lower viscosity above the glass transition. Changes in solid structure around the glass transition of amorphous systems can be measured from molecular motions using various techniques, such as dielectric analysis (DEA) and dynamic-mechanical analysis (DMA). The primary α-relaxation appears in measurements of dielectric and mechanical properties since the molecules gain translational mobility and long-range molecular motions around the glass transition. However, the stickiness behavior and molecular mobility of milk solids systems with different solids compositions (carbohydrate-carbohydrate and carbohydrate-protein) has not been either well addressed. Therefore, the present review emphasized the solids compositional effect on relaxations and molecular mobility around the glass transition in relation to stickiness behavior.
Polybenzoxazine nanocomposites containing 3,13-Diglycidyl double-decker silsesquioxane

3,13-Diglycidyloxypropyloctaphenyl double-decker silsesquioxane (3,13-diglydidyl DDSQ) was synthesized via hydrosilylation between 3,13-dihydrooctaphenyl double-decker silsesquioxane (3,13-dihydro DDSQ) and allyl glycidyl ether. This novel difunctional polyhedral oligomeric silsesquioxanes (POSS) macromer was incorporated into polybenzoxazine (PBZ) thermosets to obtain the organic–inorganic nanocomposites. Compared to control PBZ, the organic–inorganic nanocomposites displayed the enhanced glass transition temperatures (Tg's). Under the identical condition, the organic–inorganic nanocomposites exhibited the stable rubbery plateaus in the measurements by dynamic mechanical thermal analysis, which was in marked contrast to control PBZ thermoset. The enhanced Tg's and improved dynamic mechanical properties are attributable to the formation of the additional crosslinking between PBZ and the difunctional POSS macromer and the nanoreinforcement of POSS cages on PBZ networks. Thermogravimetric analysis indicates that the organic–inorganic nanocomposites displayed improved thermal stability. POLYM. COMPOS. , 38:827–836, 2017. © 2015 Society of Plastics Engineers
Compression performance of integrated 3D composite sandwich structures

A new type of 3D composite sandwich structure with foam core reinforced by composite columns, which can be called integrated 3D composite sandwich structure, is designed, fabricated, and studied. The integrated 3D composite sandwich structure inherits the advantages and improves the shortcomings of the traditional foam core composite sandwich structures. All types of the samples with different consisting materials and structural parameters are tested and analyzed under compressive load. The results show that the compressive properties of the integrated 3D composite sandwich structures are obviously better than those of the traditional foam core composite sandwich structures and due to the fact that the composite columns and the foam support each other. Moreover, the support effect is more obvious for the better toughness foam. And the structural parameters have significant influence on the out-of-plane compressive properties, especially the diameter of composite columns and the distance between composite columns. However, the variety of these parameters results in a corresponding change of the mass and then effect the specific compressive properties. Consequently, it is necessary to find a balance among these parameters in order to get the optimal properties.
Spatial correlation and capacity measurements for wideband MIMO channels in indoor office environment

This paper describes a broadband multiple input, multiple output (MIMO) channel characterization platform and capacity measurement results in indoor office environment. The MIMO testbed has been designed for broadband MIMO channel sounding, capacity measurements and for characterizing the directional-multipaths of the radio propagation channel. The MIMO channel data have been collected in 5 GHz band inside a modern office environment. Capacity results from these experiments are discussed for different propagation conditions, including non line-of-sight (NLOS) and LOS propagations with various spacings between array elements. Spatial correlations are analyzed from the measured data and a frequency selective MIMO channel model based on the correlation statistics is validated. Post-processing of the measured data with a sequential ESPRIT (Estimation of Signal Parameters via Rotational Invariance Techniques) algorithm is utilized to extract the directions of departures and arrivals of multipath components at the transmitting and receiving arrays, respectively. A method of obtaining broadband MIMO capacity, indirectly, from a single directional measurement of MIMO propagation channel is also proposed and verified from the measurement results.
Autofrettage to Counteract Coefficient of Thermal Expansion Mismatch in Cryogenic Pressurized Pipes with Metallic Liners

Composite feedlines with metal liners have the potential to reduce weight/cost while providing the same level of permeation resistance and material compatibility of all-metal feedlines carrying cryogenic propellants in spacecraft. The major technical challenges are the large difference in Coefficient of Thermal Expansion between the liner and the composite, and the manufacturing method required to make a very thin liner with the required strength and dimensional tolerance. This study investigates the use of autofrettage (compressive preload) to counteract Coefficient of Thermal Expansion when pre-pressurization procedures cannot be used to solve this problem. Promising materials (aluminum 2219, Inconel 718, nickel, nickel alloy) and manufacturing techniques (chemical milling, electroplating) are evaluated to determine the best liner candidates. Robust, autofrettaged feedlines with a low Coefficient of Thermal Expansion liner (Inconel 718 or nickel alloy) are shown to successfully counteract mismatch at LOX temperature. A new concept, autofrettage by temperature, is introduced for high Coefficient of Thermal Expansion materials (aluminum and pure nickel) where pressure cannot be used to add compressive preload.
Interfacial Reaction of Ni (P)-Sn Coating on Magnesium

Hot dip tin coating was obtained on AZ91D magnesium alloy surface, and interfacial reactions between Sn coating and electroless Ni-P plating was studied. The results show: after 220±5°C, 2h diffusion, the intermetallic compounds possessed corresponding thickness, and Ni3P layer along the interface acted as a good diffusion barrier between Sn and Ni. When Ni3Sn4 spread to the surface, microcracks were observed on the surface. Corrosion resistance of Ni(P)-Sn coating before and after diffusion was investigated with polarization curves. The results show: Ni(P)-Sn coating significantly enhance the corrosion potential of base material, but after the Ni3Sn4 growth to the surface, it caused electrochemical corrosion and decreased the corrosion resistance.
ISA Wars

RISC versus CISC wars raged in the 1980s when chip area and processor design complexity were the primary constraints and desktops and servers exclusively dominated the computing landscape. Today, energy and power are the primary design constraints and the computing landscape is significantly different: Growth in tablets and smartphones running ARM (a RISC ISA) is surpassing that of desktops and laptops running x86 (a CISC ISA). Furthermore, the traditionally low-power ARM ISA is entering the high-performance server market, while the traditionally high-performance x86 ISA is entering the mobile low-power device market. Thus, the question of whether ISA plays an intrinsic role in performance or energy efficiency is becoming important again, and we seek to answer this question through a detailed measurement-based study on real hardware running real applications. We analyze measurements on seven platforms spanning three ISAs (MIPS, ARM, and x86) over workloads spanning mobile, desktop, and server computing. Our methodical investigation demonstrates the role of ISA in modern microprocessors’ performance and energy efficiency. We find that ARM, MIPS, and x86 processors are simply engineering design points optimized for different levels of performance, and there is nothing fundamentally more energy efficient in one ISA class or the other. The ISA being RISC or CISC seems irrelevant.
Role of glutathione in intracellular amyloid‐α precursor protein/carboxy‐terminal fragment aggregation and associated cytotoxicity

Alterations in glutathione (GSH) metabolism are associated with neurodegeneration in Alzheimer's disease (AD), and GSH depletion follows application of exogenous fibrillar amyloid β (Aβ) peptides in experimental systems; these results are commonly cited as evidence of oxidative damage in AD. We used MC65 human neuroblastoma cells that conditionally express carboxy‐terminal fragments of the Aβ precursor protein (Aβ/CTFs) to directly test the hypothesis that GSH is part of the cellular response to stressors associated with Aβ/CTF accumulation and not simply a marker of oxidative damage. Our data showed that Aβ/CTFs accumulated by post‐translational processes and were associated with progressive increases in oxidative damage and cytotoxicity. Ethycrinic acid (EA) or diethyl maleate (DEM), reagents that deplete GSH through non‐specific thiol adduction, gave rise to dose‐dependent cytotoxicity that was independent of Aβ/CTF expression and minimally responsive to α‐tocopherol (AT). In contrast, buthionine sulfoximine (BSO), a selective inhibitor of GSH synthase, not only augmented Aβ/CTF‐associated cell death but unexpectedly potentiated Aβ/CTF accumulation; both outcomes were completely suppressed by AT. These data suggest that antioxidants may serve as ‘Aβ targeting’ therapies that suppress toxic protein aggregation rather than simply acting as downstream radical scavengers.
Automatic Target Word Disambiguation Using Syntactic Relationships

Multiple target translations are due to several meanings of source words, and various target word equivalents depending on the context of the source word. Thus, an automated approach is presented for resolving target-word selection, based on “word-to-sense” and “sense-to-word” source-translation relationships, using syntactic relationships (subject-verb, verb-object, adjectivenoun). Translation selection proceeds from sense disambiguation of source words based on knowledge from a bilingual dictionary with sense profiles and word similarity measures from WordNet, and selection of a target word using statistics from a target corpus. Test results using English to Tagalog translations showed an overall 64% accuracy for selecting word translation with a standardized precision of at least 80% for generating expected translations using 200 sentences with ambiguous words (an average of 4 senses) in three categories: nouns, verbs, and adjectives, using 145,746 word pairs in syntactic relationships, extracted from target corpora (317,113 words).
An Efficient Ant Colony Optimization Algorithm for Multiobjective Flow Shop Scheduling Problem

In this paper an ant colony optimization algorithm is developed to solve the permutation flow shop scheduling problem. In the permutation flow shop scheduling problem which has been vastly studied in the literature, there are a set of machines and a set of jobs. All the jobs are processed on all the machines and the sequence of jobs being processed is the same on all the machines. Here this problem is optimized considering two criteria, makespan and total flow time. Then the results are compared with the ones obtained by previously developed algorithms. Finally it is visible that our proposed approach performs best among all other algorithms in the literature. Keywords—Scheduling, Flow shop, Ant colony optimization, Makespan, Flow time
Unified force and motion control using an open system real-time architecture on a 7 DOF PA-10 robot

The operational space formulation provides a framework for the analysis and control of robotic systems with respect to interactions with their environments. Using the modified PA-10, we implemented unified force and motion control to achieve force and position tracking. Impact control algorithm has also been implemented to remove oscillation when the end-effector comes into contact with stiff environment. The control algorithm uses a PC to perform the required complex realtime computation. Coupled with the modification to the PA-10 controller, we are able to achieve high sampling rates with minimum communication latency which is crucial for our application. A software architecture was also developed which uses the concept of device drivers to achieve modularity in a realtime subsystem environment
Relationship between airborne acoustic and optical emissions during laser welding

This paper describes experimental work directed at understanding the relationship between acoustic and optical emissions from the laser welding process. Laser welds were performed and the emissions were measured with a microphone and photodiode and recorded with a data acquisition system. A time‐domain correlation analysis of the acoustic and optical signals revealed them to be highly related at a phase shift corresponding to the delay time for sound to propagate from the weld area to the microphone. A moving average model which predicted the acoustic signal from light signal measurements was fitted to experimental data using least squares regression. The acoustic signal predicted by the model was found to correspond fairly well to the experimental acoustic data. In addition, the least squares model indicated a very simple relationship between the two signals: the sound pressure predictions were proportional to the time derivative of the light signal samples. This relationship was explained by physical an.
REAL-TIME HAND GESTURE RECOGNITION USING RANGE CAMERAS

In order to enable a more natural communication with virtual reality systems, automatic hand gesture recognition appears as a suitable means. Hand gesture recognition making use of digital images has been a research topic for many years. However, the use of range cameras for automatic gesture recognition is in its infancy. Range cameras, with their capability of simultaneously capturing a full 3D point cloud with an array sensor at video rates, offer great potential for real-time measurement of dynamic scenes. The aim of this research is to build a human-machine interface using the 3D information provided by a range camera for identifying hand gestures. The first application designed recognizes the number of raised fingers that appear in a hand gesture while the second allows manipulating a moving object in a virtual environment with a hand gesture. The first application is a preliminary step towards dynamic hand gesture recognition, the second is a real-time application intended for oil and gas reservoir modelling and simulation. The proposed methodology involves 3D image acquisition, segmentation of the hand information, tracking of the hand blob, recognition of the hand gestures and determination of the position and orientation of the user’s hand. This research demonstrates the capability of a range camera for real-time gesture recognition applications. * Corresponding author.
Accretion disc–corona and jet emission from the radio-loud narrow-line Seyfert 1 galaxy RX J1633.3+4719

We perform X-ray/ultraviolet (UV) spectral and X-ray variability studies of the radio-loud narrow-line Seyfert 1 (NLS1) galaxy RX J1633.3+4719 using XMM–Newton and Suzaku observations from 2011 and 2012. The 0.3–10 keV spectra consist of an ultrasoft component described by an accretion disc blackbody (kTin=39.6+11.2? 5.5 eV) and a power law due to the thermal Comptonization (? =1.96+0.24? 0.31) of the disc emission. The disc temperature inferred from the soft excess is at least a factor of 2 lower than that found for the canonical soft excess emission from radio-quiet NLS1s. The UV spectrum is described by a power law with photon index 3.05+0.56? 0.33. The observed UV emission is too strong to arise from the accretion disc or the host galaxy, but can be attributed to a jet. The X-ray emission from RX J1633.3+4719 is variable with fractional variability amplitude Fvar = 13.5 ± 1.0? per? cent. In contrast to radio-quiet active galactic nuclei (AGN), X-ray emission from the source becomes harder with increasing flux. The fractional rms variability increases with energy and the rms spectrum is well described by a constant disc component and a variable power-law continuum with the normalization and photon index being anticorrelated. Such spectral variability cannot be caused by variations in the absorption and must be intrinsic to the hot corona. Our finding of possible evidence for emission from the inner accretion disc, jet and hot corona from RX J1633.3+4719 in the optical to X-ray bands makes this object an ideal target to probe the disc–jet connection in AGN.
Superplasticity in metals, ceramics, and intermetallics

This volume represent the proceedings of the Symposium on Superplasticity in metals, Ceramics, and intermetallics, part of the materials Research Society 1990 Spring Meeting. Topics covered include: fundamentals and theory, superplastic microstructure synthesis and uses, superplastic forming and diffusion bonding, intermetallic superplasticity, metallurgical superplasticity, ceramic superplasticity, and superplastic alloys.
Mutations that abolish the ability of Ha-Ras to associate with Raf-1.

Recent studies have revealed that Ras can associate physically with Raf. In the present study, we tested 34 mutants of Ha-Ras carrying substitution(s) in the region of residues 23-71 for their ability to associate with Raf-1. Mouse Ba/F3 cell lysates were incubated with each mutant Ras protein, in either the guanosine 5'-[gamma-thio]triphosphate (GTP gamma S)- or the guanosine 5'-[beta-thio]diphosphate (GDP beta S)-bound form, and the anti-Ras antibody Y13-238. The immunoprecipitates were analysed for the presence of Raf-1 by Western blotting with an anti-Raf-1 antibody. Six mutants of Ras, E31K, P34G, T35S, D38N, D57A and A59T, failed to bind Raf-1. Mutations N26G, V29A, S39A, Y40W, R41A, V44A, V45E, L56A and T58A partially reduced the ability to bind Raf-1. All the other mutants could associate with Raf-1 with nearly the same efficiency as that of wild-type Ras. Thus, the Raf-I-binding ability of Ras appears to be affected by mutations in the N-terminal region, and in particular, by those in and neighboring the effector region (residues 32-40) and in the region (residues 56-59) flanking the N-terminal of Switch II. The abilities to bind Raf-1 and to induce neurite outgrowth of pheochromocytoma (PC) 12 cells correlate to each other for 22 Ras mutants. However, mutation A59T, which does not reduce the neurite-inducing or transforming activities, abolishes the ability to bind Raf-1. In contrast, mutations Y32F, K42A and L53A, which impair the neurite-inducing activity of Ras, have no effect on the Ras.Raf-1 association. Partially reduced Raf-1-binding ability was observed for mutants V29A, S39A, Y40W, R41A, V44A, L56A and T58A, which exhibit full neurite-inducing activity, and also for mutant V45E, which has no activity of neurite induction.
MobiCom 2010 Poster : Towards an Optimal Malware Defense System for DTN with Heterogeneous Devices

As malware attacks become more popular in mobile handsets formed Delay Tolerant Networks (DTN), deploying an efficient defense system for helping the infected nodes to kill the malwares is important to prevent serious spreading and outbreak. In reality, the handset devices are heterogeneous in terms of operate systems, the malwares infect the targeted system in any opportunistic ways via local and global connectivity, while the to-be-deployed defense system is usually resource-limited. These points makes this problem technically challenging. In this paper, we investigate the problem of optimal malware defense system deployment with realistic assumptions that specific types of malwares can only infect the targeted system and the capacity of the defense system is limited, which are usually ignored in previous analytical work for simplicity reason. Based on the proposed framework of optimizing the anti-malware software allocation for the defense system, we give a greedy algorithm to obtain the optimal solution.