Miracle-dz/UniFAR-FTUs huggingface dataset:
New Methods for Numerical Simulation of Welding of Large Thin Structures

Welding of thin structures often leads to distortions that must be controlled. Whereas numerical simulation of small structures is relatively easy, severe difficulties are encountered in the simulation of large ones. Indeed the mesh must be considerably refined in the heat affected zone, and this leads to huge simulations and prohibitive computation times. Three alternative methods are presented here to circumvent this problem. The first one consists of using only shell elements. The second method consists of using shell elements far from the heat source and a mobile local 3D mesh close to it. The third method is a “local/global” approach which consists of first performing a local 3D simulation of a short portion of the welding bead, and then introducing inelastic strains into some global shell simulation of the full structure. These methods are critically assessed by comparing their results to those of a full 3D simulation in the typical case of a welded plate.
Compact band‐notched ultra‐wideband antenna using defected ground structure

A compact printed monopole ultra‐wideband (UWB) antenna with the band‐notched function is proposed. The antenna consists of a fan‐shaped metal patch and a trapeziform ground with a 50 Ω tapered coplanar waveguide (CPW) transmission line. By simply adjusting the length of the U‐shaped defected ground structure (DGS) in the ground plane, the band‐rejected filtering properties for the WLAN band is achieved. The proposed antenna is successfully simulated, designed, and measured, which shows an ultra‐wide matched impedance band from 3 to 15 GHz for VSWR ≤2 with a stop‐band of 5–6 GHz. The stable radiation patterns are also obtained. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 286–289, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24946
Methodology to Calculate Sight Distance Available to Drivers at Skewed Intersections

A methodology was developed to calculate sight distance available to drivers at skewed intersections of minor roads that are controlled by stop signs. The methodology considers the fact that the sight distance may vary depending on the position of the driver and the different lines of sight given to the driver by different types of vehicles. Through field observations, factors are found that affect the sight distance available to drivers. The factors include intersection geometry, the vehicle’s dimension, and the driver’s field of view. With the sight triangle properly drawn, equations were developed for calculating the available sight distance considering these factors. Values of sight distance were compared with stopping-sight distance of vehicles on the crossroads by varying design speeds and intersection angles. Nomographs were developed that can be used by road designers or operators to check if a skewed intersection satisfies the sight-distance requirement.
Rough wall heat flux augmentation analysis in the Framework of the ExoMars project

Surface roughness, especially if enhanced due to ablative form change, increases skin friction drag and convective heat transfer over re-entry vehicles. Although the corresponding heat flux augmentation is usually lower compared to increased friction, careful consideration in the prediction of the resulting heat load levels is required. Within the European Mars mission ExoMars, the potential roughness impact on the thermal protection system of the descent module has been analyzed based on analytical predictions, numerical calculations and dedicated experimental campaigns. This paper describes the experimental efforts in the compressible flow regime to study the impact of roughness at representative conditions. The data is discussed based on comparisons with prediction methods and results of other investigators. Based on this data the numerical predictive capabilities within the ExoMars program is characterized and validated.
Evaluation of Measurement Techniques for Asphalt Pavement Density and Permeability

A pavement quality indicator device developed through an NCHRP project, the Corelok device, and laboratory and field permeability index devices were evaluated for their potential to improve the Virginia Department of Transportation’s density specification or to be designated for use in a replacement specification. Fifteen samples were taken from six projects representing three nominal maximum aggregate sizes. Densities measured by a nuclear gauge correlated well with core densities measured in accordance with AASHTO T166 and by the Corelok device. Pavement quality indicator readings appeared to be repeatable but did not correlate with the densities measured in accordance with AASHTO T166 or with the Corelok device. A fair correlation was obtained for two projects. Laboratory permeability and field permeability indices were correlated with pavement density. A good correlation was found between the laboratory permeability and field permeability indices. The relationship appears to be linear in the range agencies typically specify.
Bipolar resistive switching in Cu/AlN/Pt nonvolatile memory device

Highly stable and reproducible bipolar resistive switching effects are reported on Cu/AlN/Pt devices. Memory characteristics including large memory window of 103, long retention time of >106 s and good endurance of >103 were demonstrated. It is concluded that the reset current decreases as compliance current decreases, which provides an approach to suppress power consumption. The dominant conduction mechanisms of low resistance state and high resistance state were verified by Ohmic behavior and trap-controlled space charge limited current, respectively. The memory effect is explained by the model concerning redox reaction mediated formation and rupture of the conducting filament in AlN films.
Ballistic Applications of Glass and Kevlar Fibre Vinylester Composites

Void-free E-glass and Kevlar-49 fibre reinforced vinylester laminates prepared under compression moulding were found to have Charpy impact strength of 576 KJlm2 and 304 KJlm2, respectively. Ballistic immunisation tests carried out on the glass reinforced vinylester laminates with thickness ranging from 12 mm to 54 mm against 7.62 mm rifle bullets produced an exponential relationship between the per cent attenuation in bullet velocity and the areal density of the laminates; whereas the relationship was linear for 9 mm carbine fire with laminate thicknessvarying from 5.5 mm to 12 mm .
Metabolite profiling, distribution of secretory structures, and histochemistry in Curculigo orchioides Gaertn. and Curculigo latifolia Dryand. ex W.T.Aiton

Abdul Halim UMAR, Diah RATNADEWI*, Mohamad RAFI, Yohana Caecilia SULISTYANINGSIH, Hamim HAMIM Graduate School of Plant Biology, Department of Biology, Faculty of Mathematics and Natural Sciences, IPB University, Bogor, Indonesia College of Pharmaceutical Sciences Makassar, Sekolah Tinggi Ilmu Farmasi (STIFA) Makassar, Makassar, Indonesia Academy Pharmacy of Kebangsaan Makassar, Akademi Farmasi (AKFAR) Kebangsaan Makassar, Makassar, Indonesia Department of Biology, Faculty of Mathematics and Natural Sciences, IPB University, Bogor, Indonesia Department of Chemistry, Faculty of Mathematics and Natural Sciences, IPB University, Bogor, Indonesia Advance Research Laboratory, Institute of Research and Community Services, IPB University, Bogor, Indonesia
Analytical Model for the Design of HSFC and UHSFC Jackets with Various Steel Fiber Volume Fraction Ratios for the Retrofitting of RC Beam-Column Joints

High-strength steel fiber-reinforced concrete (HSFC) and ultra-high strength steel fiber-reinforced concrete (UHSFC) jackets have been proved experimentally to be much more effective with respect to other strengthening schemes in improving the hysteresis performance of existing substandard reinforced concrete (RC) structural members. In this paper, an existing analytical model for the prediction of the shear capacity of RC beam-column joints strengthened with a HSFC or UHSFC jacket is extended to provide design formulation of these innovative HSFC and UHSFC jackets. An authoritative validation of the proposed formulation is also achieved by comparisons of experimental results of 50 beam-column joint specimens with the analytical predictions of the model. Test data used for verification have been collected from the literature based on experimental studies of the authors and other researchers. The merits of the HSFC and UHSFC jacketing technique are also highlighted in the state of practice. Design and application of the proposed fiber-reinforced concrete jackets in deficient existing RC beam-column joints provides a sustainable strengthening technique by contributing to the reduction in the cost and to labor-intensive procedures of common jackets by completely replacing the installation of reinforcement.
Does School District Board Type Affect Fiscal Conditions? Examining Debt Positions

Abstract In the United States, the question of which is a better form of governance and leadership – elected or appointed – is considered to be a relevant issue in public administration. Many studies have advocated the appointed form in terms of professional management and fiscal performance. However, there is limited knowledge about the application of this form of government to school districts that are the main issuers in the municipal bond market, but financially rely on state governments. We discuss whether the type of education board in the school district (i.e. appointed or elected boards) affect debt positions. We expect school districts with citizen-elected boards to be more likely to reduce debt positions due to the reelection concerns of board members. Using a panel dataset of New Jersey school districts from 1997 to 2016, we are able to estimate the impact of board type on the cumulative debt of a board. The findings offer evidence that, when compared to appointed school boards, elected school boards are more likely to reduce their long-term debt and interest payments, as well as long-term debt as a percentage of own-source revenue.
Effects of pre-emptive analgesia on efficacy of buccal infiltration during pulpotomy of mandibular primary molars: a double-blinded randomized controlled trial

Abstract Objective: To assess the effect of preoperative administration of ibuprofen and acetaminophen on the efficacy of buccal infiltration for pulp therapy in mandibular primary molars. Materials and methods: A randomized controlled trial with an ID no. NCT03423329 in Clinical-Trials.gov was conducted in the outpatient clinic of Paediatric Dentistry Department at Ain Shams University. The study was designed with two test arms where either ibuprofen or acetaminophen was administered to children whereas in the control arm a multivitamin placebo was used. Children's self-reported pain responses were recorded using Wong–Baker FACES pain scale. For statistical analysis, Chi-square test or Fisher’s exact test was used to compare between the three groups whereas Friedman’s test was used to study changes within each group. Results: In a sample of 60 children, a significant decrease in the mean pain rating scores was detected in all groups where success rates ranged from 40% with ibuprofen to 55% and 65% with acetaminophen and placebo, respectively. However, there was no statistically significant difference between the three groups regarding severity of pain during access cavity preparation. Conclusions: Both analgesics have no clinical advantage over the placebo in increasing the efficacy of buccal infiltration during pulp therapy in mandibular primary molars.
Organizational structure, employee problem solving, and lean implementation

Purpose – The aim of this study was to understand the relationship between organizational structure and lean implementation success and to explore the impact of a lean implementation on the development of employee problem-solving skills. Organizations that implement lean manufacturing strategies experience widely differing results, with unexpected outcomes for some organizations. Design/methodology/approach – This study was conducted using qualitative research methodologies. Specifically, a case study was performed at an electronics manufacturer in the northwestern USA over a three-month time period. The researchers collected data from a variety of sources at the manufacturing site. Findings – Two significant findings emerged. First, the lack of dedicated personnel for the lean implementation inhibited the widespread adoption of lean practices. Second, evidence supported the role of the lean implementation in positively affecting employee problem-solving skills. Research limitations/implications – This pa.
A Study of Manning Coefficient Related With Vegetation Density along the Vegetated Channel

Experiments are conducted to study the change of Manning coefficient of reed population along the channel in gradually varied flow. Water depth and velocity are investigated under various reed densities, corresponding to a set of discharge values. The corresponding Manning coefficients along the channel and the functional relationships with vegetation density are studied. The results show that the Manning coefficient is more volatile in vegetation zone and the average Manning coefficient exhibits a linear relationship with the vegetation density. The conclusions can provide some guidance and reference for cofferdam design in natural and constructed wetland and the research on vegetated channel erosion.
The Maximum Factor by Which Forced Vibration of Blades Can Increase Due to Mistuning

In 1966 it was shown that the maximum factor by which the amplitude of forced vibration of blades can increase due to mistuning is, with certain assumptions, 1/2(1 + √N), where N is the number of blades in the row. This report gives a further investigation of the circumstances when this factor can be obtained. These are small damping, and a relationship must hold between the mistuning distribution y(s) and the interblade coupling function c(r), where r is the mode number. The mistuning distribution must be symmetric about the blade on which maximum amplitude is to occur, s = 0. The coupling function must be symmetric about r = R, where R is the mode number of the excitation. If the coupling is purely mechanical, additional conditions apply. The coupling function c(r) must consist of a number of identical symmetric substrips. A 1976 result for mechanical coupling is amended.
P‐58: Imaging Polarization Interferometer for Flat Panel Display Characterization

The next generation of MURATest will be able to make a hyper spectral analysis to get a high definition image with adjustable wavelength resolution. This paper introduces the principle of the new system, based on an imaging polarizing interferometer. The phase shift is realized by two symmetrical Wollaston prisms. The system produces an interference pattern directly on the CCD camera. The phase shift is linearly changed for all pixels using a mechanical translation.
Education Quality of Best Public High Schools in South and Central Somalia

The purpose of this study was to explore what nine high school principals did to outperform other schools in the South and Central regions of Somalia. The study highlighted the high school principals’ perception of maintaining education quality concerning curriculum, instruction, and assessment. The study focused on the admission process, teaching, and learning performances of the top nine high schools in South and central Somalia. The methodology of this Qualitative study was descriptive phenomenology. The research design and approach were semi-structured open-ended interview protocol that comprised eight interview questions. Purposeful sampling was the sampling method. Nine principals participated in the study and provided the research data regarding the education quality of nine high schools in Somalia. All nine principals in this study maintained their high schools' education quality using a rigorous admission process. They utilized a government-developed official curriculum. Five principals reported that they employed specialist instructors, while six stated that their students actively participated in the learning process during class time. However, all the participants reported that smartphones hindered student learning. A slight majority of five principals (56%) stated that parental interventions were vital to schools' overall learning achievements. Somalia's public schools are far behind in utilizing effective educational technology. The technological literacy of the teachers is vital to effectively employ the accessible educational technology, which encouraged students to incorporate modern technologies in their learning activities successfully. Rigorous admission process, efficient curriculum, instruction, effective instructional materials, employing professional instructors, and active learning are all important components to maintain education quality.
Test Results for Liquid “Damper” Seals Using a Round-Hole Roughness Pattern for the Stators

Test results are reviewed for two annular liquid seals (L = 34.9 mm; D = 76.5 mm) at two clearances (.1 and .12 mm). The seal stators use hole-pattern-roughened stators that are identical except for hole depths of.28 and 2.0 mm. Tests are conducted at three speeds out to 24,600 rpm and three pressures out to 68 bars. Test data consist of leakage rates and rotordynamic coefficients at centered and eccentric positions with static eccentricity ratios out to 0.5. Test results are consistent with expectations in regard to the reduction of cross-coupled stiffness coefficients due to stator roughness. However, the measured direct stiffness coefficients were unexpectedly low. A partial explanation for these results is provided by measured friction factor data which show an increase in the friction factors for pressure-driven flow with an increase in clearance. A prediction model for rotordynamic coefficients, incorporating the friction-factor data, predicted a substantial loss in direct stiffness but could not explain the very low (or negative) values that were measured. The model did explain the measured drop in cross coupled stiffness (k) and provides an alternative explanation to observed reductions in k values; specifically, an increase in the friction factor with increasing clearance causes a reduction in k irrespective of any parallel reduction in the average circumferential velocity.
A radiographic study for comparison of lower third molar eruption in different Anteroposterior skeletal patterns and age-related groups

The aim of this study is to evaluate the predictability of third molar eruption using parameters seen in Orthopantomograms and Lateral cephalograms. 180 lower third molars were evaluated from pre-treatment Orthopantomograms and Lateral cephalograms of 90 patients. These radiographs were grouped based on the Anteroposterior skeletal jaw base as Class I, Class II and Class III with 30 samples each; which were further classified as age-related sub-groups with 15 samples each and impaction related sub-groups. Comparison was done in these groups, using linear and angular measurements. Comparison within age and impaction-related subgroups revealed that the parameters such as RMS(P=0.008,
A numerical evaluation of electromagnetic fields exposure on real human body models until 100 kHz

Purpose – The purpose of this paper is to describe how numerical models of human body have been applied for the evaluation of current density induced by strong magnetic field, to verify the respect of the basic restriction proposed by International Committee Non Ionizing Radiation Protection (ICNIRP) guidelines.Design/methodology/approach – Finite element method has been used in order to compute the induced current density in a suitable human body model and a simplified model – a homogeneous cylinder – due to a time‐varying magnetic field.Findings – In the practical case of a resistance welding equipment, the implemented computational technique has been used in order to evaluate both the magnetic flux density and the induced current density in different tissues. Their values have been also compared with the ones obtained in a homogeneous cylinder.Practical implications – The proposed method can be used in order to evaluate the compliance of the magnetic field produced by resistance welding equipments with.
COMPARISON OF VARIOUS DISTRIBUTIONS USED FOR COLLAGEN FIBRE ORIENTATIONS IN ARTERIAL LAYERS

To consider tissue anisotropy in computational models of arterial wall, information on directions of collagen fibres and their dispersion in the individual layers of the wall is needed. Many papers introduce the assumption of two fibre families although its experimental substantiation is poor. In this paper we analyse data on direction distribution of collagen fibres published in several papers, in contrast to their authors, without any anticipatory assumptions. Histograms and their different mathematical representations are compared by means of coefficient of determination R2 to obtain the best representation of the experimental data. The results show that in most of the analysed cases other distributions give better representation of the experimental data; specifically, the presented bimodal fit was surpassed with uni-, trior quadri-modal distributions or even with isotropic distribution with a large noise. This effect could be even enhanced when information criteria were applied. Finally, the best mathematical representations of the data (the best fits) are transformed into parameters used by anisotropic constitutive models in FEM analyses.
Government Policy and Personal Retirement Saving

Incentives to save for retirement have been an important component of government tax policy since the Revenue Act of 1942 made employer pension contributions tax-deductible. Since that time, pension funds have grown enormously. Private firm pension assets increased from $13 billion in 1950 to $1,836 billion in 1989. But only about half of the work force is covered by a pension plan and thus benefit from this inducement to employers to save for their employees' retirement. To address this inequity and to provide a retirement saving incentive for employees not covered by pension plans, the Individual Retirement Account (IRA) was introduced in 1974. Under this plan, employees without an employer provided pension plan could put up to $1,500 each year in an IRA account. The contribution was tax-deductible and the return on the bal
Experimental Investigation of the Characteristics of a Savonius Wind Turbine

Many tests have been conducted on models in a wind tunnel for an optimum configuration of a Savonius rotor wind turbine. Three types of Savonius rotor have been used (a simple Savonius rotor of mild steel, an overlapped Savonius rotor of mild steel and one overlapped Savonius rotors of aluminium). The effect of different design parameters, namely rotor shape, overlap between rotor blades was studied. The results have corroborated some of the original findings of Savonius.
3D imaging using narrowband bistatic MIMO radar

A new method for three-dimensional (3D) imaging via a narrowband bistatic multiple-input-multiple-output (MIMO) radar with two uniform rectangular arrays is presented. After matched filtering and phase compensation, the method utilises the 2D cross-range images measured by the transmit and receive arrays to reconstruct the 3D image of the target. Compared with the 3D wideband monostatic MIMO imaging, lower hardware cost can be achieved since the narrowband waveforms are employed. In addition, the range alignment in wideband imaging can be avoided for the poor range resolution of the narrowband waveforms.