Miracle-dz/UniFAR-FTUs huggingface dataset:
Numerical Investigation Of The Leakage Flows In Twin Screw Compressor Rotors

Screw compressors are complex flow systems, but operate upon simple considerations: they are positive displacement machines consisting of meshing rotors contained in a casing to form a working chamber, whose volume depends only on the angle of rotation. Although the basic operation of twin screw compressors is well understood and the analytical methods for performance prediction are well established, the CFD analysis of such machines is still in its early days and requires more research in order to mature to the level of standardised application, as is the case with most turbomachinery applications. The performance of screw compressors is highly affected by leakages, which are dependent on various clearances and the pressure differences across these clearances. The numerical simulation of the leakage flows is the challenging aspect of running CFD in screw compressors, as the flow domain reduces in tip areas to the order of several microns. Commercial grid generators struggle in reproducing the flow path with good quality elements and user defined meshing techniques are currently available to allow the remeshing of the rotors domain to capture the modified aspect of the compression chamber at the start of each time step. This technique allows the full compressor performance prediction by means of CFD but does not allow for local mesh refinement in the tip area, where the turbulent character of the flow requires adequate boundary layer considerations. This is the area of concern in the present paper, where several means of investigating the flow in the very tight tip clearance area are proposed: 1) a three-dimensional model of all interacting compression chambers to investigate the effects of employing meshdeforming techniques for the compressor simulation; 2) a simplified two-dimensional leakage model to identify the mesh refinement requirements for appropriate turbulence modelling.
Memanfaatkan Layanan Web

9 Vol.2 No.1 2017 @2017 kitektro Rancang Bangun Aplikasi Rekam Medis untuk Praktik Pribadi Dokter Berbasis Android dan Memanfaatkan Layanan Web Iwansyah Putra , Rahmad Dawood , Roslidar 3) 1,2,3) Jurusan Teknik Elektro dan Komputer, Universitas Syiah Kuala Jl. Tgk. Syech Abdul Rauf No. 7, Darussalam, Banda Aceh 23111 Indonesia iwansyahp@mhs.unsyiah.ac.id rahmad.dawood@unsyiah.ac.id roslidar@unsyiah.ac.id
PENGARUH JENIS PAHAT, KECEPATAN SPINDEL, DAN KEDALAMAN PEMAKANAN TERHADAP TINGKAT KEKASARAN DAN KEKERASAN PERMUKAAN BAJA ST. 42 PADA PROSES BUBUT KONVENSIONAL

Proses pengerjaan logam adalah salah satu hal terpenting dalam pembuatan komponen mesin, terutama proses pengerjaan logam dengan mesin bubut. Sehingga diperlukan inovasi yang terus menerus untuk meningkatkan kualitas hasil produksi. Ada beberapa cara yang bisa dilakukan, misalnya dengan pemilihan jenis pahat, kedalaman pemakanan, dan kecepatan spindel yang tepat. Dari penggunaan beberapa cara tersebut muncul permasalahan bagaimana pengaruh perbedaan jenis pahat, kecepatan spindel dan kedalaman pemakanan terhadap tingkat kekasaran dan kekerasan permukaan benda kerja pada proses bubut konvensional. Penelitian yang dilakukan ini adalah penelitian eksperimen. Dalam penelitian ini benda kerja yang digunakan sebanyak 27 buah yang mendapatkan perlakuan berbeda dalam proses pengerjaannya, yaitu dengan variasi jenis pahat, kecepatan spindel dan kedalaman pemakanan. Kemudian dari ke 27 benda kerja tersebut masing – masing benda kerja ditentukan 3 titik untuk dilakukan uji kekasaran dan 3 titik untuk dilakukan uji kekerasan. Dari hasil pengujian yang diperoleh kemudian dilakukan analisis tabel. Hasilnya kekasaran permukaan baja terbaik atau terendah adalah 3,28 μm yang diperoleh dari jenis pahat (Bohler), kecepatan spindel tertinggi (750 rpm), dan kedalaman pemakanan terendah (0,4 mm). Sedangkan kekerasan permukaan baja terbaik atau tertinggi adalah 51,5 Kg/mm2 yang diperoleh dari jenis pahat (Jck), kecepatan spindel terendah (300 rpm), dan kedalaman pemakanan paling tinggi (0,8 mm).
Influence of Rogers' technological attributes on Internet Diffusion Dynamics: the case of Piedmont Region

The spread of Internet technology tends to be slow especially among elderly people in many European countries. This situation appears even more critical if the demographic trends are considered in a context where the aging phenomenon will represent a significant challenge in the next future. This paper aims to investigate the relationship between age and Internet diffusion dynamics in Piedmont Region (Italy), mainly focusing on how people perceive the technological attributes and features of Internet technology. To achieve this objective a specific survey has been undertaken among Piedmont citizens. The questionnaire’s responses show a low propensity exhibited by old age people towards the adoption of Internet. In particular, it emerges that the subjective perceptions of technological attributes and features of Internet that significantly differ between users and not-users may exert a great influence on its diffusion dynamics.
Aggression and Violent Behavior Broadening campus threat assessment beyond mass shootings

Record reviews of public figure, primary/secondary school, and workplace threateners and attackers displayed the importance of noticing pre-incident behaviors and intervening to prevent violence. General crime prevention strategies did not appear applicable. Similarly, campus threat assessment research has considered targeted violence as distinctive and unable to be reviewed within general collegiate samples, which has related to questions about the prevalence, predictiveness, applicability, and reporting of pre-incident behaviors. This article applies general criminological and crime prevention findings to these questions and presents campus threat assessment methodologies informed by these fields. With college student surveys, pre-incident behaviors have appeared predictive of general physical assault, which promotes investigation of the generalizability of campus threat assessment across collegiate bullying, intimate partner, stalking, and workplace violence concerns. In college student surveys, the majority of observed pre-incident behavior has not been reported to campus authorities and has been impacted by students’ personal victimization, assessment of dangerousness, and relationship with the perpetrator. Efforts to enhance reporting in general criminological and crime prevention fields could be applied to improving pre-incident authority notification. Thus, viewing campus threat assessment within the broader violence prevention framework can advance the efficiency, effectiveness, and applicability of the approach.
Nature and association of public and private investment: Public policy implications for South Africa

South Africa has a low investment-to-GDP ratio compared to other developing countries. The share of government investment in the total investment has also been declining. In this context, the paper uses quarterly data from 1960 to 2005 to analyse the nature and relationship between public and private investment in South Africa. The findings of the study have strong policy implications and indicate that although public investment is not “crowding in/out” private investment, it exerts an indirect impact on private investment through the accelerator effect. Hence an increase in government spending on infrastructure and social sectors is likely to enhance private investment in the country. Therefore a more proactive fiscal policy is suggested to increase the investment-GDP ratio which can stimulate higher growth rates. Key words: Crowding in/out, public investment, infrastructure.
AI based design of a fuzzy logic scheme for speed control of induction motors using SVPWM technique

Summary The reliability and performance of the AC drives depends on the progress in power electronics, microelectronics, control methods, artificial intelligent techniques and so on. Fuzzy Logic Concept (FLC), one of the Artificial Intelligent methods has found high applications in most of the nonlinear systems like the electric motor drives. FLC can be used as controller for any system without requirement of the system mathematical model unlike that of the conventional electrical drive control, which uses the mathematical model. Due to the usage of the FLC concept, the efficiency, reliability & performance of the AC drives increases. In view of the previously mentioned concepts, this paper presents a rule-based fuzzy logic controller scheme designed and applied for the speed control of an induction motor by using the Space Vector Pulse Width Modulation (SVPWM) technique. The closed loop speed control of the induction motor using the above technique, thus provides a reasonable degree of accuracy. Instantaneous space voltage vectors applied by the inverter have redundancy characteristics, which provide some flexibility for selecting the inverter switching modes. Simulink based block model of induction motor drive is used for the simulation purposes & its performance is evaluated for the speed control. The inverter duty cycle can also be calculated using the space vector PWM techniques. The proposed method improves the dynamic performance of the induction machine compared to the conventional speed control of induction motor drives & has got a faster response time. The simulation results presented in this paper show the effectiveness of the proposed method, which has got a wide number of advantages.
Circulating oxidized low density lipoprotein and non-high density lipoprotein cholesterol concentrations in metabolic syndrome Egyptian women before and after specific nutritional therapy

Abstract Aim: To investigate the relation between the metabolic syndrome (MetS), and oxidized low density lipoprotein (ox-LDL) and non-high density lipoprotein cholesterol (non-HDL-C), and to evaluate a dietary therapy composed of a balanced hypocaloric regimen plus a supplement prepared from whole wheat and tigernut flour (Cyperus Esculentus). Material and Methods: Forty two obese Egyptian female volunteers (their mean age was 47.76± 0.90) were given a low caloric balanced diet (900-1000 kcal) for 4 weeks, and then the supplement was used to replace Baladi bread during the next four weeks. The metabolic syndrome was diagnosed according to the International Diabetes Federation criteria. Results: The prevalence rate of MetS was found to be 76.2%. The metabolic syndrome was significantly associated with higher levels of total cholesterol (T.cholesterol), LDL-C, ox-LDL and non HDL-C. Significant and sustained reduction in the levels of fasting blood glucose and HbA1c, normalization of lipid profile, and decrease in the levels of ox-LDL were observed after the end of the two periods of the dietary therapy. Conclusion: Metabolic syndrome is associated with higher levels of circulating ox-LDL and non-HDLC. The use of the dietary therapy composed of balanced hypocaloric regimen plus a supplement rich in antioxidants and anti-inflammatory components, reduced obesity and the risky biochemical markers of the MetS.
Urban land use, mobility and theory of science: exploring the potential for critical realism in empirical research

Academic discussion where the adequacy of positions within theory of science is illustrated by means of examples from empirical research studies seems to be an area of neglect. The purpose of this paper is to contribute to such a debate, using examples from investigations into the relationship between urban structure and travel behaviour. The main research question of these investigations was whether, and to what extent, urban structural conditions are influencing residents' transportation activity. In other words, is there a causal relationship between urban structure and travel behaviour? Furthermore, we asked whether results from studies of the relationship between land use and transport can provide a basis for predictions about the likely consequences of alternative land-use strategies. The methodology and empirical findings of the studies are discussed in the light of the theory of science position labelled ‘critical realism’, in an attempt to relate theory of science to empirical research, but also in order to contribute to the discussion of the usefulness of this specific approach. Copyright © 2002 John Wiley & Sons, Ltd.
MOPSMAP v1.0: a versatile tool for the modeling of aerosol optical properties

Abstract. The spatiotemporal distribution and characterization of aerosol particles are usually determined by remote-sensing and optical in situ measurements. These measurements are indirect with respect to microphysical properties, and thus inversion techniques are required to determine the aerosol microphysics. Scattering theory provides the link between microphysical and optical properties; it is not only needed for such inversions but also for radiative budget calculations and climate modeling. However, optical modeling can be very time-consuming, in particular if nonspherical particles or complex ensembles are involved. In this paper we present the MOPSMAP package (Modeled optical properties of ensembles of aerosol particles), which is computationally fast for optical modeling even in the case of complex aerosols. The package consists of a data set of pre-calculated optical properties of single aerosol particles, a Fortran program to calculate the properties of user-defined aerosol ensembles, and a user-friendly web interface for online calculations. Spheres, spheroids, and a small set of irregular particle shapes are considered over a wide range of sizes and refractive indices. MOPSMAP provides the fundamental optical properties assuming random particle orientation, including the scattering matrix for the selected wavelengths. Moreover, the output includes tables of frequently used properties such as the single-scattering albedo, the asymmetry parameter, or the lidar ratio. To demonstrate the wide range of possible MOPSMAP applications, a selection of examples is presented, e.g., dealing with hygroscopic growth, mixtures of absorbing and non-absorbing particles, the relevance of the size equivalence in the case of nonspherical particles, and the variability in volcanic ash microphysics. The web interface is designed to be intuitive for expert and nonexpert users. To support users a large set of default settings is available, e.g., several wavelength-dependent refractive indices, climatologically representative size distributions, and a parameterization of hygroscopic growth. Calculations are possible for single wavelengths or user-defined sets (e.g., of specific remote-sensing application). For expert users more options for the microphysics are available. Plots for immediate visualization of the results are shown. The complete output can be downloaded for further applications. All input parameters and results are stored in the user's personal folder so that calculations can easily be reproduced. The web interface is provided at https://mopsmap.net (last access: 9 July 2018) and the Fortran program including the data set is freely available for offline calculations, e.g., when large numbers of different runs for sensitivity studies are to be made.
Effect of the diel cycle on production of dimethylsulfoniopropionate in batch cultures of Emiliania huxleyi

Changes in intracellular dimethylsulfoniopropionate (DMSP), nitrogen, carbon, chlorophyll a (chl a), total cell volume and cell numbers were measured during day and night in axenic, exponentially growing batch cultures of the coccolithophorid, Emiliania huxleyi, cultured at 20°C under a 12 h light:12 h dark cycle. Cellular DMSP content in the cultures increased at a specific rate of 0.80 ± 0,10 d -1 (mean ± SE) during the day and 0.53 ± 0.12 d -1 at night. By contrast, cellular carbon and chl a content of the culture and total cell volume increased only during the day (at specific rates of 1.30 ± 0.08 d -1 , 1.54 ± 0.12 d -1 and 1.39 ± 0.12 d -1 , respectively). Cellular nitrogen content of the culture showed a much higher specific rate of increase during the day (1.07 ± 0.07 d -1 ) than at night (0.22 ± 0.03 d -1 ). Because intracellular DMSP had a lower specific rate of synthesis during the day and a higher specific rate at night than specific production rates for the various cell biomass parameters (total cell volume, and cell carbon, nitrogen and chl a), ratios of DMSP to these parameters were highest at the end of the dark period and decreased during the day. The maximum intracellular DMSP concentrations at the beginning of the light period may provide some level of protection from oxidative stress with the daytime initiation of photosynthesis. Significant intracellular production of DMSP during the night contradicts current conventional wisdom, which assumes that no nighttime biosynthesis of DMSP occurs. Previous calculations based on this invalid assumption will need to be reassessed.
RANDOM AMPLIFIED POLYMORPHIC DNA (RAPD) ANALYSIS OF THREE STOCKS OF LABEO FIMBRIATUS FROM INDIAN PENINSULA

The Random Amplified Polymorphic DNA (RAPD) was applied to analyze the genetic variation in three stocks of Labeo fimbriatus representing Cauvery, Vedavathi and Tungabhadra river streams of peninsular India. A total of 8 primers viz., OPA-07, OPP-11, OPB-17, OPF-01, OPF-03, OPF-12, OPD-19, OPP-16 were used to assay the polymorphisms among three stocks. The genetic relationships were studied based on polymorphisms generated by RAPD-PCR. The STATISTICA dendrogram based on the genetic distance matrix revealed a clear grouping of three stocks of fimbriatus into two clusters where in Cauvery and Vedavathi stocks together formed a cluster while Tungabhadra alone formed a separate cluster. It indicates that both Cauvery and Vedavathi are closely related whereas Tu ngabhadra was genetically away from other two stocks. The genetic distance within the stocks of Cauvery, Tungabhadra and Vedavathi stocks was 0.05, 0.12 and 0.11, respectively. It indicates that the Tungabhadra stock indicated higher proportion of heterozy gous genotypes while Cauvery with more homogenate genotypes. Using this technique, only slight differences in genetic diversity were detected. Further, studying using mitochondrial DNA (mt-DNA) analysis, RFLP fingerprinting, or the sequencing of hyper variable regions of the mitochondrial genome may increase the validity of this conclusion.
Robustness Measure of China’s Railway Network Topology Using Relative Entropy

This study focused on China’s railway network topology issue from a robustness measure perspective. Relative entropy is used in the study as a measurement of robustness of railway network topology. It is found that the entropy-based measure provides more informative analyses compared to a traditional graph measure. The results indicate that the railway network in the 12th five-year plan has improved robustness when compare to 2008 with respect to deliberate and random attacks.
Prediction of the median IDA curve by employing a limited number of ground motion records

A methodology has been proposed which can be used to reduce the number of ground motion records needed for the reliable prediction of the median seismic response of structures by means of incremental dynamic analysis (IDA). This methodology is presently limited to predictions of the median IDA curve only. The reduction in the number of ground motion records needed to predict the median IDA curve is achieved by introducing a precedence list of ground motion records. The determination of such a list is an optimization problem, which is solved in the paper by means of (1) a genetic algorithm and (2) a proposed simple procedure. The seismic response of a simple, computationally non‐demanding structural model has been used as input data for the optimization problem. The presented example is a three‐storey‐reinforced concrete building, subjected to two sets of ground motion records, one a free‐field set and the other a near‐field set. It is shown that the median IDA curves can be predicted with acceptable accuracy by employing only four ground motion records instead of the 24 or 30 records, which are the total number of ground motion records for the free‐field and near‐field sets, respectively. Copyright © 2007 John Wiley & Sons, Ltd.
Effect of pH and moisture content on endophytic colonization of maize roots

9cfu/g root) was observed at pH 11 with SWAN cultivar and the least at pH 6.9 with TZSRY cultivar (1.24 - 1.62 × 10 9 cfu/g root). The highest fungal count (2.6 - 10.4 × 10 4 cfu/g root) was obtained throughout the period of study, at pH 3 with TZSRY. Both the bacterial and fungal populations were significantly different at the pH levels, with consistently higher count for pH 11 and 3, respectively. All the MCs showed a general decrease in bacterial population at the second and fifth week; however, MC (70%) with TZSRY had the highest population (2.0 - 1.02 × 10 9 cfu/g root). MC (30%) with SWAN showed a consistent high fungal population throughout the study at 3.6 - 13.0 × 10 4 cfu/g root. SWAN cultivar generally showed more bacterial and fungal colonization than TZSRY. Bacillus sp. , Saccharomyces sp. , Pseudomonas fluorescens, Bacillus subtilis, Staphylococcus epidermidis and Micrococcus roseus were the common endophytic microorganisms of both maize cultivars. This work shows that there were differences in the bacterial and fungal populations (resistance/susceptibility to environmental factors) in the roots of maize. The cultivars also differed in tolerance to pH and moisture contents implying that plants have influence on the microorganisms in its own rhizosphere.
Dealing with uncertainty in qualitative models with a semi-quantitative approach based on simulations. Application to the Gironde estuarine food web (France)

In the context of ecosystem approach to fisheries, it is a critical issue to build management tools able to predict the possible trajectories of ecosystems under various human pressure or environmental variations, but also capable to point out influent and sensitive components. A major drawback of quantitative models is that they require many data to be implemented, which are often not available. Qualitative modelling with loop analysis needs only few data and offers the possibility to predict effect of sustained perturbations on an ecosystem. It considers direct and indirect interactions by inversing its qualitative community matrix. However, depending on the complexity of the studied ecosystem, predictions can
A Proposal on Cloud based Data Centre using Shared Memory of Mobile Storage by Virtualization

Cloud computing is a broadly used technology which serves users with resources on specific demand enhancing manageability, minimizing the data management and operational cost. Basically, cloud allows users to store their valuable data on the cloud storage so the security of the data center and easy access are considered as focusable parts in cloud computing. In the study we spot light to a new approach of cloud computing where mobile storage is used to build the data center of cloud and easy access having a preferable security. We deliberate that it is possible to lower the cost if the data center is built using user's mobile storage so a 3-tier technology is proposed. Firstly, a layer is user's mobile devices, second layer is server with different virtual machines and last layer is again the user's mobile device which is used to build the data center of cloud (mobile-server-mobile). A mobile app implements the initial security and management issues. Users can oscillate data between first layer and third layer with the help of virtual machines that ensure secure transaction of data, reduction of power consumption, maintenance cost, bandwidth consumption and fast data sharing.