Miracle-dz/UniFAR-FTUs huggingface dataset:
Analysis and Design of PDM Converter with High Frequency Link for HEV Drive System

A discrete pulse density modulation (PDM) converter with high frequency (HF) link is introduced to improve the performance of hybrid electric vehicle (HEV) drive system requiring high power density. The drive system is made of HF resonant inverter, HF transformer and PDM converter. The inverter changes battery DC voltage into AC signal with 20kHz, which is distributed as power sources for different equipments in HEV by the transformer. By mean of zero-voltage switching technique, the PDM converter transfers the HFAC signal into the single phase AC power with low frequency to drive induction motor. Based on the vehicle dynamic characteristics, the mathematic analysis of the PDM converter is presented, the operation principle and control strategy are described. The theory analysis shows that the proposed system has the advantages of higher energy density, flexibility in the choice of voltage levels in the HEV, and freedom from acoustic noise. The simulation results prove that the system has the merit of easy control, faster system response, and the lower switch losses
Fast analysis of maca bioactive compounds for ecotype characterization and export quality control

Maca (Lepidium meyenii Walp.) storage hypocotyls have been used since pre-Columbian times by Andean dwellers due to their high nutritional value and energizing properties, which appear to counteract some of the negative physiological effects of high altitudes. Maca has been propelled to the status of highly successful Peruvian export through reports of its energizing/invigorating properties and its effectiveness against benign prostate hyperplasia. Although studies reporting these effects have been performed using hexane, chloroform, alcohol or aqueous extracts, none have used pure compounds and one cannot pinpoint the biologically active compounds in the plant tissue. Analytical methods are needed which can provide in a reliable, quick and simple fashion the amounts of potential bioactive compounds in export material and also, since maca is exported as the dry hypocotyls, of the quality of the postharvest treatment used to naturally dry the plant tissue. We propose two, possible methods, for the sequential evaluation of bioactive marker compounds in maca. A headspace capture system coupled to a 10 min GC-MS run for the fast analysis of benzylamines, aldehydes, alcohols, isothiocyanates and nitriles and a solid phase extraction method using ion exchange and reverse phase cartridges sequentially followed by LC-MS analysis for total glucosinolates and fatty acid benzylamides. Both methods also allow the direct comparison of maca ecotypes in order to target them in the export market for their various purported physiological effects.
Development of the ornithine cycle in rat liver: Zonation of a metabolic pathway

Ammonia‐fixation in mammalian livers is, via the ornithine cycle and glutamine synthetase, strictly compartmentalized, occurring in a wide upstream periportal compartment and in the very last downstream pericentral hepatocytes, respectively. This conclusion is based on the well‐known distribution patterns of carbamoyl phosphate synthetase I (CPS) and glutamine synthetase in the developing and adult liver. To determine to what extent the expression patterns of the ornithine cycle enzymes are coordinated with that of CPS, we investigated the patterns of expression of the individual messenger RNAs (mRNAs) of the ornithine cycle pathway in developing and adult rat liver. Our results show that, within the liver, all mRNAs of the ornithine cycle pathway are zonated. The patterns of expression of the different mRNAs match almost perfectly, with variations only in the steepness of the gradients of the mRNAs, suggesting that, in the rat, common regulatory factors are involved in the establishment of the zonation pattern.
Dental Material Choices for Pulp Therapy in Paediatric Dentistry

Objective: The purpose of this study was to assess the restorative choices for pulpal therapy by members of the Australian and New Zealand Society of Paediatric Dentistry (ANZSPD). Methods: Members of the ANZSPD were sent an online survey asking about the procedures that they performed and their choice of dental materials. Results: The respondents were 31 general dentists (GD) and 55 specialist paediatric dentists (PD). Materials used for indirect pulp capping included calcium hydroxide [Ca(OH)2] cement (CHC), glass ionomer cement or resin-modified glass ionomer cement (GIC/RMGIC), Ca(OH)2 paste (CHP) and mineral trioxide aggregate (MTA). Materials for direct pulp capping included MTA, CHP and CHC. Materials and techniques used for pulpotomy included MTA, ferric sulphate, formocresol and diathermy, CHP and CHC. GD and PD were similar in their choice of materials. However, there was no preferred product for pulp therapy. Most GD learnt how to use MTA from CPD lectures, while some PD learnt how to use MTA from their postgraduate training as well as CPD lectures. Many GD and PD did not have hands-on training from their education on how to use MTA (GD: 80%, PD: 43%). Most would like to attend hands-on MTA courses (GD: 86%, PD: 65%). Conclusion: There was no clear preferred product for the various types of pulp therapy in paediatric dentistry. Education appears to be the major barrier to the use of MTA rather than the cost of MTA.
Large spatial datasets: Present Challenges, future opportunities

The key advantages of a well-designed multidimensional database is its ability to allow as many users as possible across an organisation to simultaneously gain access and view of the same data. Large spatial datasets evolve from scientific activities (from recent days) that tends to generate large databases which always come in a scale nearing terabyte of data size and in most cases are multidimensional. In this paper, we look at the issues pertaining to large spatial datasets; its feature (for example views), architecture, access methods and most importantly design technologies. We also looked at some ways of possibly improving the performance of some of the existing algorithms for managing large spatial datasets. The study reveals that the major challenges militating against effective management of large spatial datasets is storage utilization and computational complexity (both of which are characterised by the size of spatial big data which now tends to exceeds the capacity of commonly used spatial computing systems owing to their volume, variety and velocity). These problems fortunately can be combated by employing functional programming method or parallelization techniques.
False match elimination for face recognition based on SIFT algorithm

The SIFT (Scale Invariant Feature Transform) is a well known algorithm used to detect and describe local features in images. It is invariant to image scale, rotation and robust to the noise and illumination. In this paper, a novel method used for face recognition based on SIFT is proposed, which combines the optimization of SIFT, mutual matching and Progressive Sample Consensus (PROSAC) together and can eliminate the false matches of face recognition effectively. Experiments on ORL face database show that many false matches can be eliminated and better recognition rate is achieved.
Study of influence of inductance variation of position sensorless control of SynRM at low speeds by estimating high-frequency extended EMF caused by superimposed current

Synchronous reluctance motors (SynRMs) have attracted attention, because SynRMs have no magnets in the rotor. Position sensorless control at low speeds of SynRMs is now desired, and several methods have been proposed. The new position sensorless control method of SynRMs at low speeds by estimating a high-frequency extended e.m. f. (EEMF) caused by superimposed high-frequency current has been proposed by authors. The feature is that the amplitude of the superimposed high-frequency current is controlled to a small constant value. In this paper, the influence of inductance variation, which is large in the SynRMs, of the proposed position sensorless control method is investigated. And, in the proposed method, it is experimentally shown that the influence of the position estimation caused by the inductance variation is very small and the position sensorless control method is useful.
Analysis of landing behaviour of three layer lines on different perch designs

Abstract 1. The prevalence of keel bone deformities in laying hens is high and is partly associated with unsuitable perch designs, which impose a risk of injury due to an unstable footing. 2. Over two experiments, 9 or 10 hens of each of three layer lines (Lohmann Selected Leghorn (LSL), Lohmann Tradition (LT) and Lohmann Brown (LB)) were filmed while landing on three different perch types, including steel perches of various diameters, a commercial mushroom-shaped plastic perch and a newly developed prototype perch with a soft surface material. 3. Data on landing behaviour (safe vs. unsafe or failed landing) following downward jumps were collected for 25, 50 and 60 cm vertical distances and 75 cm horizontal distance between a wooden start perch and the different destination perches. 4. The highest proportion of safe landings occurred on the prototype perch, whereas least safe landings were observed on steel perches, irrespective of their diameter. The mushroom-shaped perch was intermediate with regard to the safeness of landing. 5. A threshold of 50 cm vertical distance (34° slope) was identified as the optimum for downward jumps on perches in order to reduce the risk of unsafe or failed landings. Above this threshold, the proportion of safe landings declined significantly. 6. Brown shell layer types (LB and LT) had a lower proportion of safe landings compared to the white shell layer type (LSL), whereas no difference was found between LB and LT layer lines. 7. Although steel perches prevail in commercial housing, these perches were found to be least advantageous with regard to landing behaviour. The prototype perch provided the most stable footing on perching and is a promising alternative to replace commercial steel perches, thus helping to reduce the risk of perch-related keel bone injury.
Bifunctional fusion between nerve growth factor and a transferrin receptor antibody

The cDNAs encoding the variable regions of the heavy and light chains of a murine antibody specific for the human TfR were cloned and a human chimera (γ1, κ) was produced. A gene fusion was created by joining the 3′ end of the coding region of the human nerve growth factor (NGF) precursor to the 5′ end of the heavy chain variable region of the chimeric antibody. When expressed with the unmodified light chain in mammalian cells, the protein fusion is properly processed, assembled, and secreted. Subsequent purification and characterization established the uncompromised bifunctional activities of the protein, relative to the unmodified components, as demonstrated by its ability to both bind to the human TfR and induce neurite outgrowth in primary sympathetic or spinal ganglia and in trkA‐transfected pheochromocytoma cells. The ability to generate biologically active NGF fused to a TfR targeting antibody, which was previously shown to cross the blood‐brain barrier, may offer a novel way to deliver NGF and other neurotrophic factors to the central nervous system. J. Neurosci. Res. 47:123–133, 1997. © 1997 Wiley‐Liss, Inc.
High viscosity fluid simulation using particle-based method

We present a new particle-based method for high viscosity fluid simulation. In the method, a new elastic stress term, which is derived from a modified form of the Hooke's law, is included in the traditional Navier-Stokes equation to simulate the movements of the high viscosity fluids. Benefiting from the Lagrangian nature of Smoothed Particle Hydrodynamics method, large flow deformation can be well handled easily and naturally. In addition, in order to eliminate the particle deficiency problem near the boundary, ghost particles are employed to enforce the solid boundary condition. Compared with Finite Element Methods with complicated and time-consuming remeshing operations, our method is much more straightforward to implement. Moreover, our method doesn't need to store and compare to an initial rest state. The experimental results show that the proposed method is effective and efficient to handle the movements of highly viscous flows, and a large variety of different kinds of fluid behaviors can be well simulated by adjusting just one parameter.
An Efficient Real Time Method of Fingertip Detection

Fingertips detection has been used in many applications, and it is very popular and commonly used in the area of Human Computer Interaction these days. This paper presents a novel time efficient method that will lead to fingertip detection after cropping the irrelevant parts of input image. Binary silhouette of the input image is generated using HSV color space based skin filter and hand cropping done based on histogram of the hand image. The cropped image will be used to figure out the fingertips.
Reflexive hybrid approach to provide precise answer of user desired frequently asked question

To answer consumers' queries as per their expectation has become a need and requirement in today's scenario. On the other end, it is a challenging problem to handle and acquire precise answer of everyone's query. In several commercial systems question-answer section has become a reflexive and robotic system which handles answers associated to users questions with a newfangled idea. In today's scenario frequent asked question section are not static questions and answer as in earlier system, therefore system has to answer every query by matching the most similar question from the archives or provide relevant content from website. Same issue has been attended here and proposed a novel approach in order to improve its ability and overcome the challenging task of finding similar questions from the knowledge base of files of publicly available frequently asked questions accurately. In the proposed approach, we extract lexical, structural and semantic behavior of the user query and provide a hybrid approach which is basically combination of term frequency-Inverse document frequency with POS tagging and Word2Vec to retrieve most similar answer corresponding to entered user query. These techniques include methods taken from the natural language processing and information retrieval. We have also compared our approaches using cosine similarity as an evaluation metric along with considering the time complexity. Experimental results shows that our proposed hybrid approach gives better performance as compared to other individual techniques.
Linear time algorithms for approximating the facility terminal cover problem

In this paper, we consider an interesting generalization of the weighted vertex cover problem, called the Facility Terminal Cover (FTC) problem. In the FTC problem, each vertex is associated with a positive weight, each edge is associated with a positive demand, and the objective is to determine a subset of vertices and a capacity for each selected vertex so that the demand of each edge is covered by the capacity of one of its two endpoints and the total weighted capacity of all selected vertices is minimized. The FTC problem is motivated by several key network optimization problems, such as the power assignment problem in ad hoc networks, and could be used as a subroutine to solve such problems. No quality‐guaranteed solution is previously known for the FTC problem. In this paper, we present two linear time approximation algorithms for this problem. Our first algorithm achieves deterministically an approximation ratio of 8 by using an interesting rounding technique and a lower‐bounding technique. Based on interesting randomization techniques, our second algorithm further improves the approximation ratio to 2e, where e is the natural logarithmic base. The second algorithm can be easily derandomized in quadratic time. Our algorithms are relatively simple and can be easily implemented for networking applications. Experiments show that the two algorithms behave rather similarly, especially in large‐size graphs, indicating that the solutions yielded by one or both algorithms are much closer to the optimum. © 2007 Wiley Periodicals, Inc. NETWORKS, Vol. 50(1), 118–126 2007
Spectra of clinical CT scanners using a portable Compton spectrometer.

PURPOSE Spectral information of the output of x-ray tubes in (dual source) computer tomography (CT) scanners can be used to improve the conversion of CT numbers to proton stopping power and can be used to advantage in CT scanner quality assurance. The purpose of this study is to design, validate, and apply a compact portable Compton spectrometer that was constructed to accurately measure x-ray spectra of CT scanners. METHODS In the design of the Compton spectrometer, the shielding materials were carefully chosen and positioned to reduce background by x-ray fluorescence from the materials used. The spectrum of Compton scattered x-rays alters from the original source spectrum due to various physical processes. Reconstruction of the original x-ray spectrum from the Compton scattered spectrum is based on Monte Carlo simulations of the processes involved. This reconstruction is validated by comparing directly and indirectly measured spectra of a mobile x-ray tube. The Compton spectrometer is assessed in a clinical setting by measuring x-ray spectra at various tube voltages of three different medical CT scanner x-ray tubes. RESULTS The directly and indirectly measured spectra are in good agreement (their ratio being 0.99) thereby validating the reconstruction method. The measured spectra of the medical CT scanners are consistent with theoretical spectra and spectra obtained from the x-ray tube manufacturer. CONCLUSIONS A Compton spectrometer has been successfully designed, constructed, validated, and applied in the measurement of x-ray spectra of CT scanners. These measurements show that our compact Compton spectrometer can be rapidly set-up using the alignment lasers of the CT scanner, thereby enabling its use in commissioning, troubleshooting, and, e.g., annual performance check-ups of CT scanners.
Estimating effective dose from 3D imaging with interventional fluoroscopy systems using limited exposure data

Background Estimations of the effective dose from three-dimensional (3D) rotational imaging with interventional fluoroscopy systems are hampered by the fact that not all systems provide individual exposure values for each projection image included in the examination. Purpose To investigate the error in resulting effective dose introduced by not using individual exposure values for each projection image in the dose calculations for 3D rotational imaging with interventional fluoroscopy systems. Material and Methods An interventional fluoroscopy system was used to acquire images of two anthropomorphic phantoms. Calculations of the effective dose were performed using two different methods: 1, using individual exposure values for each projection image; and 2, using the mean tube voltage and the total dose-area product (DAP), evenly distributed over a selection of projection images. The second method was also tested in hypothetical examinations to investigate the effects of worst-case scenarios regarding the effect of exposure asymmetry on the error. Results The error in resulting effective dose obtained when simplifying the dose calculations by using Method 2 instead of Method 1 was within ±14%. The error increased slightly for the worst-case scenarios but was still smaller than ±20%, regardless of anatomical region, tube voltage variation, and patient size. Conclusion Given the uncertainties associated with the effective dose concept as well as of reported DAP values, the present study indicates that dose calculations based on average exposure values distributed over a smaller selection of projection angles can provide reasonably accurate estimations of the radiation doses from 3D imaging using interventional fluoroscopy systems.
AODV-UI with Malicious Node Detection and Removal for Public MANET

A node in Mobile Ad-hoc Network (MANET) solely depends on neighbor nodes for its connectivity to the outer networks. It is completely different with fixed network connection where a central infrastructure is providing connectivity to the outside network for all mobile nodes there. This kind of situation makes MANET easier to build rather than fixed network with certain infrastructure. However, this nature of MANET makes it very vulnerable to various attacks, especially by nodes within the MANET that is called malicious nodes. This paper provides a preliminary result for MANET security enhancement based on AODV-UI routing protocol. In this work we implement an algorithm to detect and remove malicious nodes in AODV-UI routing protocol. We evaluate our work in different scenarios by varying the number of nodes, the number of malicious node, the sending rate of the node in concern, and the type of the attack i.e. route poisoning, black hole, packet spoofing. Our experiment shows that on average, an attack can be completely removed within 0.48 seconds in the worst case, with the traffic rate of 100 kbps, and 0.04 seconds in the best case, with the sending rate of 10 kbps.
Topical Alprostadil for the Treatment of Female Sexual Arousal Disorder

Female sexual dysfunction is a common disorder that is present in over 40% of women in the USA. An evaluation of female sexual dysfunction differs greatly from male erectile dysfunction in that female sexual dysfunction is a very general term that encompasses a variety of sexual complaints in women, rather than a specific physiological disorder. No pharmacological treatment is presently approved for the treatment of the myriad of disorders that are involved in female sexual dysfunction. One of the more common disorders of female sexual dysfunction involves disturbances in objective or subjective sexual arousal. Sexual arousal in women has a central component and a peripheral, or vulvar, component. Disorders in vulvar blood flow and stimulation may lead to decreased genital and central arousal. A logical corollary of this statement is that an improvement in local blood flow by the use of a local or systemic vasodilator may lead to an increase in overall sexual arousal and an increase in sexual satisfaction. This article will explore the use of topical alprostadil as a local vasodilator to improve sexual arousal and sexual satisfaction in women with female sexual arousal disorder.
Formaldehyde concentrations in Wisconsin mobile homes.

Mobile homes utilize a class of prefabricate construction techniques which rely greatly upon the use of particle board and hardwood plywood paneling for structural components. This has resulted In household sources which may emit formaldehyde into the home, since urea-formaldehyde resins are used as the bonding agent in most pressed wood stocks. A series of 137 mobile home households was investigated to determine indoor formaldehyde exposure concentrations. Homes were selected based on the estimated age of the construction components. Homes were studied serially for a nine-month period, with formaldehyde samples obtained on a monthly basis using a modified NIOSH chromotropic acid procedure. Formaldehyde concentrations were found to range from less than 0.10 ppm to 2.84 ppm. The median exposure concentration was 0.39 ppm. Analysis of variance was performed on each home to discern visit and room measurement effects. Eighty-nine percent of the homes exhibited no measurement placement effects, while only 10 p.