Miracle-dz/UniFAR-FTUs huggingface dataset:
Modelado de diodos Schottky para aplicaciones a frecuencias de terahercios

Schottky diodes fabricated by the University of Virginia in USA have been subject of intense recent investigation and have emerged as attractive candidates at THz frequencies. Single Schottky diodes have junctions with extremely low junction capacitance, and low series resistance which makes them extremely well-suited for commutating mixer circuits in which ideal switching behaviour is highly desirable [1]. Schottky diodes also offer lower forward voltage compared to an otherwise equivalent p-n junction diode. This permits Schottky diodes to detect lower amplitude signals than a p-n junction. In this paper we describe a procedure to extract the parameters of a high performance THz Schottky diode. Model extraction is done using a combination of dc and small-signal RF measurements. The results show that the proposed method is suitable to determine parameters of diode model with the excellent fit between measured and calculated I-V DC and Sparameter. I. INTRODUCCION Los diodos Schottky se han utilizado durante varias decadas como elementos clave en la mezcla de frecuencias y la deteccion de potencia en radiofrecuencia. En 1938 Walter Schottky, hijo del matematico aleman Friedrich Shottky [2], explico la manera en la que un compuesto formado por metal y un semiconductor dopado puede rectificar. El diodo Schottky es el resultado de este trabajo. Los diodos Schottky fabricados en Arseniuro de Galio (GaAs) tienen una barrera de potencial baja, lo que se traduce en una alta sensibilidad, caracteristica muy importante para dispositivos que tienen que detectar senales muy debiles. El modelo fisico de un diodo esta basado en las caracteristicas fisicas del dispositivo, lo que permite reproducir el comportamiento del mismo para cualquier tipo de senal de entrada. El modelo circuital de diodo esta basado en la topologia clasica que tiene en cuenta los mecanismos fisicos observables en un diodo Schottky, como son la emision termoionica [3], mecanismo que explica la corriente que fluye a traves de la union. Este articulo plantea un procedimiento de obtencion del modelo circuital equivalente lineal y no lineal de un diodo Schottky, por ser el elemento clave de los detectores mezcladores, multiplicadores, etc. de altas frecuencias. La extraccion del modelo se basa en dos tipos de medidas. Se realizara el modelado en continua del diodo, tambien se obtendra el comportamiento en AC del diodo, mediante el modelado de los parametros de Scattering hasta 45 GHz. II. MODELADO DEL DIODO SCHOTTKY EN CONTINUA (DC) En este trabajo se mostrara la caracterizacion del diodo Schottky modelo W Bande Single Anode de la Universidad de Virginia. En la figura 1 se muestra una foto del diodo, [4]. Fig. 1. Foto Del Diodo Schottky Single El modelo total se conseguira mediante la combinacion de medidas en continua y alterna, que nos permiten obtener la caracterizacion corriente-tension (I/V) especifica del diodo y los parametros [S]. El modelo de equivalente gran senal del diodo es el representado en la figura 2 [5]: Fig. 2. Modelo Equivalente Gran Senal del Diodo Lp
Self-assembling manifolds in single-cell RNA sequencing data

Analysis of single-cell transcriptomes remains a challenge in that subtle differences of cell types are difficult to resolve. Here we present the self-assembling manifolds (SAM) algorithm, which dynamically rescales gene expression to amplify differences between cells. We demonstrate its advantage over other methods by analyzing stem cells from Schistosoma, a parasite that infects >250 million people. Benchmarking on another 47 datasets, SAM consistently improves cell clustering and marker gene identification.
A Systematic Review of Persuasive Strategies in Stress Management Apps

Stress is a widespread problem that impacts physical, mental and emotional health. Mobile health (mHealth) apps are being used to promote self-regulation and stress coping. Although existing literature has conducted reviews on the persuasiveness of various mHealth apps, stress management apps have rarely been examined from persuasion standpoint. Therefore, we deconstruct the per-suasive strategies employed in 60 stress management apps using the primary task support category of the Persuasive Systems Design (PSD) framework. This systematic review aims to uncover the persuasive strategies employed in these apps, how they were implemented, and the relationship between the number of employed strategies and app effectiveness. The results of the app review by two researchers reveal that personalization is the most commonly employed strategy (n=53) overall, followed by self-monitor ing (n=39), simulation (n=19), and tailoring (n=14). We discuss the implication of our findings, and also proposed some design recommendations that can improve the persuasiveness of stress management apps based on our results.
Soil physicochemical properties drive the variation in soil microbial communities along a forest successional series in a degraded wetland in northeastern China

Abstract The Sanjiang Plain is the biggest freshwater wetland locating in northeastern China. Due to climate change and human activities, that wetland has degraded to a successional gradient from the original flooded wetland to dry shrub vegetation and a forest area with lower ground water level, which may result in changes in soil microbiologic structure and functions. The present study investigated the microbial diversity and community structure in relation to soil properties along that successional gradient. The soil physico‐chemical properties changed significantly with degradation stage. The Shannon diversity index of both soil bacteria (5.90–6.42) and fungi (1.7–4.19) varied significantly with successional stage (both p < .05). The community structures of soil bacteria and fungi in the early successional stages (i.e., the wetland) were significantly determined by water content, total nitrogen, and available nitrogen concentrations in soils, while those in the later successional stages (i.e., forests) were significantly structured by soil organic carbon, soil pH, and available phosphorus concentrations. These results suggest that the soil microbial structure is mainly determined by soil properties rather than by plant community such as plant species composition along successional stages.
Road Distress Measurements Using UAV

Yolun bakimi ve iyilestirilmesi cok onemli eylemlerdir. Bu nedenle, bu eylemler yapilmadan once yol kosullari dogru bir sekilde incelenmelidir. Arazideki manuel ve gorsel olarak yapilan inceleme, yol durumunu izlemek icin geleneksel olarak kullanilan yontemdir. Ancak, bu, zaman alici, yogun emek isteyen ve maliyetli bir yontemdir. Buna ek olarak, geleneksel inceleme yontemi sadece denetleyiciler icin degil ayni zamanda yayalar ve suruculer gibi yolun birincil kullanicilari icin de guvenlik problemi olusturur. Bu calismada, yol durumunun incelenmesi icin insansiz hava araci (IHA) kullanilmaktadir. IHA teknolojisi, verileri verimli ve dogru bir sekilde toplamak icin onemli bir arac haline gelmektedir. Onerilen yontem uc adimdan olusur. Ilk olarak, IHA ucusundan bircok goruntu elde edilir. Daha sonra, goruntuler, uc boyutlu (3B) nokta bulutu, sayisal yuzey modeli ve ortomozaik olusturmak icin kullanilir. Son olarak, iki boyutlu (2B) ve 3B verilerden yol bozukluklari tespit edilir ve olculur. Onerilen metodolojiden elde edilen olculer, geleneksel inceleme yonteminden alinan olculerle karsilastirilmistir. Her iki olcumden de nispeten benzer sonuclar elde edilmistir. Sonuc olarak, IHA olcum tekniginin kullanimi yol bozukluklarini tespit etmek icin uygundur. Onerilen yontemin avantajlari goz onune alindiginda, geleneksel inceleme yontemi yerine IHA'nin kullanilabilecegi sonucuna varmak oldukca guvenilirdir.
A Review On Nanocrystals In Drug Delivery

Throughout the last 20 years, several trendy technologies are established within the pharmaceutical analysis and development space. The automation of the drug drug discovery method by technologies like high output screening, combinatorial chemistry and computer aided drug design is resulting in a huge range of drug candidates possessing a very good efficacy. Unfortunately, several of drug candidates are a unit exhibiting poor liquid solubility. The use of drug nanocrystal is an universal formulation approach to extend the therapeutic performance of those medication in any route of administration. Drug nanocrystals are crystals with a size range in the nanometer range, meaning that they are nanoparticles with a crystalline character. This review describes the chemistry properties of drug nanocrystals, production method and potential clinical advantages. Poorly soluble medication are usually difficult drawback in drug formulation. Reducing the particle size of a drug to a nono-scale leads to an increased in surface area-to-volume ratio, increased dissolution velocity and improved in vivo performance of poorly soluble drugs.
Automated patient position in CT examination using a Kinect camera

Proper positioning of the patient in the CT examination is important. Patients who are not properly positioned at iso-center can affect the distribution of radiation dose. Every patient is unique, hence matching a center of the patient with the iso-center is not a trivial task. This study has developed a system for automatic patient centering using a Kinect camera located at the right or left side of a patient. A plastic water slab phantom was used for calibrating pixel value and pixel size for various distances. Twenty patients were automatically positioned by the Kinect camera and the results were compared to manually positioning by medical personnel. It was found that the value and size of the pixel depend on the Kinect camera-object distance. The value and size of pixels linearly increase with the increase of distance. The difference between the manual patient positioning by medical personnel and the automatic method by the Kinect camera was 1.80 ± 0.95 cm. The difference for the 6 patients was more than 2 cm, and for the 14 patients was less than 2 cm. Hence, the Kinect camera with automatic software can help in positioning patients automatically and accurately in real-time so that it can reduce time and effort in finding patient centers.
The Attitude of Students towards the Learning of Social Studies and Their Performance: The Case of Accra Metropolitan Assembly in the Greater Accra Region of Ghana

This study sought to examine students’ attitude towards learning of Social Studies and their performance in the Accra Metropolitan Assembly in the Greater Accra Region of Ghana. A sample of seventy-two (72) teachers was used. Methodologically, the study adopted the simple random sampling technique and purposive sampling technique. Questionnaires were used as the main data collection instrument. Kohler’s theory of insight learning served as the theoretical basis for this study. The quantitative data was analyzed using Statistical Package for Social Sciences (SPSS) version 23.0. whereas the qualitative data was transcribed appropriately. It was found that students in the Accra Metropolitan Assembly performed averagely in Social Studies. They also have positive attitudes towards studying Social Studies. It is therefore recommended that Ghana Education Service should recruit professional teachers to teach Social Studies in Senior High schools. This will help the students to improve more with the right knowledge in Social Studies.
Ash Removal from a Sample Coal by Flotation Using Rhamnolipid Biosurfactants

Synthetic chemicals from petroleum origins are now coming to a turning point on their hazardous problems to living organisms. In this regard, biosurfactants are well acknowledged as potential constitute for their chemical counter-part due to structural similarities. In this study, the surface activity and frothability of the rhamnolipid product produced from a Pseudomonas aeruginosa strain were measured. Then, frothing behavior of rhamnolipid as a frothing reagent to a sample coal flotation was evaluated. Rhamnolipid was found to have high surface activity and frothing capacity compared to pine oil as conventional frother in coal flotation practices, due to its higher molecular weight and presence of multiple oxygenated groups in its structure. The overall performance of sample coal flotation decreased as rhamnolipid concentration was increased. The decrease in flotation efficiency can be ascribed to probable depressing action of rhamnolipid to coal particles.
Validity evidences of the Buying Impulsiveness Scale in the Brazilian Context

Abstract The objective of this study was to obtain evidence of validity of an instrument to measure the tendency to buy impulsively. A version adapted to Brazil of a Buying Impulsiveness Scale was applied to 1296 Brazilians from all states of the federation, with a mean age of 35.8 years (SD = 12.8). The results indicated a scale with one-factor structure, just like the original instrument, with an adequate index of internal consistency. Positive correlations were found between impulse buying tendency, normative social influence, and traits of impulsiveness of the consumer. The instrument was also able to differentiate people who make shopping lists from those who do not do them, and people who prefer to go shopping alone from those who prefer to buy accompanied by someone else. The evidences found in the study provide support to the use of the instrument for the Brazilian context.
Decision Making Process in Keystroke Dynamics

Computer system intrusion often happens nowadays. Various methods have been introduced to reduce and prevent these intrusions, however no method was 100% proven to be effective. Therefore, to improve the computer’s security, this writing will explain the application of KD in the application system. The effectiveness of KD could not guarantee one hundred percent to prevent the computer intrusion, but it can be used as a second level of security after the login page in the application system. The pattern and time taken while typing by an individual is the core for the second level of security check after the login page. This writing will elaborate and conclude past studies related to KD on the aspects of decision-making process. Various methods of processing KD data that have been used are listed and the results of the study are compared. The results of this writing are expected to help new researchers in the process of evaluating KD data.
Rancang Bangun Alat Pemotong Kentang Berbentuk Stick Berbasis Mikrokontroller ATMega 328

Perkembangan zaman saat ini mempengaruhi berbagai aspek kehidupan masyarakat, yang mana gaya hidup di kalangan masyarakat saat ini yang lebih suka mengkonsumsi makanan siap saji. Terutama makanan siap saji dengan bahan dasar kentang yaitu stik kentang. Produk olahan stik kentang banyak dilakukan pada industri rumahan yang masih menggunakan alat produksi secara manual yang tidak dapat memproduksi dalam kapasitas banyak dan membutuhkan waktu yang lebih lama. Dari permasalahan tersebut penulis mencoba merancang sekaligus membuat alat pemotong kentang secara otomatis agar waktu yang dibutuhkan untuk memproduksi relatif lebih singkat dan kapasitas dari hasil yang didapatkan lebih maksimal. Alat ini dibuat dengan meneliti waktu yang dituhkan alat untuk memotong 0,25 Kg kentang. Dalam penelitian ini menggunakan sensor VL53L0X sebagai pendeteksi kentang, pneumatik untuk mendorong kentang ke arah mata pisau yang digerakkan oleh kompresor dengan mengatur tekanan udara menggunakan selenoid valve dan ATMega 328 sebagai pusat kontrol pada sistem kerja alat secara keseluruhan.
Experimenting on simple and flexible top-down approaches for hydrological modelling

<p>Nowadays, a plethora of modelling software on rainfall-runoff and groundwater dynamics are available. Considering the complexity and heterogeneity of natural processes governing the water cycle, many of those models involve physically-based formulations. Inevitably, a large amount of data is also required. However, the available data are often insufficient, while their quality questionable. At the same time, an increasing model complexity also gives rise to high computational requirements. In order to mitigate some of the aforementioned issues, during the past years a simple and flexible top-down approach for distributed rainfall-runoff modelling has been developed (Tran et al., 2018). Essentially, the distributed rainfall-runoff model is built starting from a simple lumped model, whose parameters are then spatially disaggregated. Disaggregation is carried out using conceptual links between model parameters and natural catchment characteristics. </p><p>We now test an extended version of this methodology involving disaggregation relationships for more model parameters. Moreover, we evaluate modelling performance for 2 different configurations. The first starts from the parameters of a lumped conceptual model and is essentially the original approach. The second one starts from the parameters of a uniform distributed conceptual model. The motivation behind the new approach is that it allows a better-integrated routing scheme with less model parameters. In turn, this can further reduce equifinality (denoting the &#8220;phenomenon&#8221; that largely different parameter-sets can often result to largely similar model outcomes). The two approaches are inter-compared and evaluated against flow observations. </p><p>With the disaggregated models as basis, we also experiment on the potential of simple methods for modelling groundwater levels. We approach this challenge by trying to identify links between a) the variations and b) the reference levels of the modelled groundwater storages and observed groundwater levels. For example, we hypothesize that modelled storages can be scaled to the actual level variations via the specific yield, which expresses the amount of interconnected pores in the soil. The modelling methodology is evaluated against groundwater level measurements. </p><p>&#160;</p><p>Tran, Q.Q. , De Niel, J., Willems, P., 2018. Spatially Distributed Conceptual Hydrological Model Building: A Generic Top-Down Approach Starting From Lumped Models. Water Resour. Res. 54, 8064&#8211;8085. </p>
Organocatalysis using bifunctional aminoboronic acids : application to the asymmetric aldol reaction

The organocatalytic iminium activation strategy acting cooperatively with a Lewis acidic group has been applied to the development of a novel generation of proline-based aminoboronic acid catalysts. Key steps for their synthesis included (-)-sparteine mediated asymmetric deprotonation of N-Boc-pyrrolidine, copper(I) catalysed borylation of alkylhalides and catalysed hydroboration of alkenes. The evaluation of the first proline-based aminoboronic acids is described in the context of organocatalysed aldol reactions between p-nitrobenzaldehyde and acetone. Enhanced reactivity and enantioselectivity observed in the presence of a boronate ester analogue of the catalyst resulted in further examination regarding the role of the esterification diol in these organocatalytic reactions. Notably, 11B NMR studies have been assessed, allowing the evaluation of different diols in terms of stability and Lewis acid tuning, and plausible identification of the catalytic species present. The feasibility of the catalyst under optimised reaction conditions was demonstrated in the aldol reaction of different substrates. Extended mechanistic studies lead to the proposal of a catalytic cycle in which a highly organised transition state plays a key role for both the reactivity and enantioselectivity observed. Finally, strategies employed to further examine both reactivity and asymmetric induction of the free boronic acid catalyst are discussed, examing the carbon length chain between the secondary amine moiety and the boronic acid group of the catalyst.
Seamounts as hot-spots of large pelagic aggregations

The distribution of four top predators in the Tyrrhenian Sea, a sub-basin of the Mediterranean Sea, was investigated by means of random forest regression considering depth, distance from the coast, seafloor slope, and distance from seamounts as habitat descriptors on a 2x2–nautical mile regular grid. RF results are processed to estimate variable importance and model performance. Random forest architecture reached optimal sensitivity and specificity, thus providing a consistent support tool for identifying suitable habitats. The considered species are characterized as having patched suitable habitats with a number of hot-spot areas where the different species’ habitats overlap. These hot-spot areas’ locations correspond to those of specific seamounts identifying the attraction effect of these topographic structures. The mean features typifying the most attractive seamounts are investigated and found to be shallow peak and base depths but wide base area and high relative elevation.
Impact of Bisphenol A on the Physicochemical and Bacteriological Characteristics of Water in Storage Tanks from various Locations in Salem University Lokoja, Kogi State, Nigeria

This study examined the impact of Bisphenol A (BPA) on the physicochemical and bacteriological characteristics of water in storage tanks in Salem University Lokoja. Borehole water samples were collected from three (3) locations within the University environment and stored in a jerry can for analysis. Total Heterotrophic Bacteria Count (THBC) in water samples ranged from 1.00± 0.30 x10 at week 0 to 8.95±1.00 x10 cfu/ml at week 3, while the total coliform count (TCC) also ranged from 1.30±0.15 x10 to 7.11±0.82 x10 cfu/ml. TCC and THBC were found to be higher than the NSDWQ Standard. The identified isolates from the borehole samples were Escherichia coli, Pseudomonas aeruginosa, Streptococcus faecalis, Bacillus cereus, Staphylococcus epidermidis and Serretia spp. Bisphenol A (BPA) was not detected in week 0, after week 3, components of Bisphenol A detected were methyl chloride, Benzene and Dichlorobenzene and their highest values were 0.054±0.033, 0.021±0.020 and 0.055±0.062 mg/l respectively. The pH, Turbidity, Total suspended solids, BOD and conductivity reduced as storage increased. Magnesium and calcium for sample B were found to have the highest value of 0.31 and 1.73 mg/l respectively. Storage of water for a long period of time should be discouraged as it could trigger increased leaching of BPA into the water which will affect its physicochemical and microbiologically quality. DOI: https://dx.doi. org/10.4314/jasem.v24i2. 5 Copyright: Copyright © 2020 Udochukwu and Olannye. This is an open access article distributed under the Creative Commons Attribution License (CCL), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Dates: Received: 16 November 2019; Revised: 11 January 2020; Accepted: 22 February 2020
Application of VR in Art Design

VR (virtual reality) is a new type of audio-visual integrated information technology which integrates multimedia technology and network technology. The three significant characteristics of VR make it different from other visual technologies are on information interaction, spatial conception and perception comprehensiveness. With the unique presentation and 3D image generation of VR, it is gradually applied to many fields such as architecture, industry, environmental design, etc. VR through data model modeling and precise data calculation can maximize the intuitive display of the scene to be experienced according to the needs of customers, and improve the customer’s feelings and the timeliness of information exchange. At present, the application of VR in the world is more mature in the field of game industry and tourism. With the continuous development of the application, VR brings new vitality and new experience to many industries. This paper makes an in-depth study on the application of VR in art design, studies the change and impact of VR on art design and the feasibility model of VR applied in art design.