bluuebunny/crossref_metadata_2025_split huggingface dataset:
Decomposing the performance metrics of coconut cultivation in the South Indian States
Authors: Kappil Shine Raju , Aneja Ranjan , Rani Poonam 
Published: May 2021

AbstractCoconut (Cocos nucifera) is extensively cultivated and used as a staple ingredient in Indian cuisines, especially in the South Indian cuisines. In India, other than edible purposes, coconut is widely used in religious practices and, it is considered as symbol of prosperity. Despite these facts, several upturns and downturns occurring in the growth trends of coconut in recent periods irrespective of geographical differences. This study attempts to decipher the growth trends in the area, the production and yield of coconut in major coconut producing states in India from 2000–2001 to 2017–2018. Kerala, Tamil Nadu and Karnataka are the states in India where coconut palms are extensively cultivated and produced in large quantities. These states together contribute to approximately 84 per cent of the total area for cultivation of coconut and account for over 87 per cent of total production in the country. We analyse the growth trends in coconut cultivation using appropriate growth equations to estimate the growth rates and instabilities in growth trends. Besides, we use decomposition analysis to find the role of area, price, yield and crop mix effects on coconut production. The results reveal that Karnataka secured high growth in coconut production and its productivity and recorded better acceleration but fluctuated heavily between the phases of years under investigation. It shows that the price effect and yield effect play a crucial role in the total change of coconut production among the selected states. Based on the results, we recommend the local governments and other dedicated authorities to ensure that coconut growers have better access to modern technology, quality inputs, marketing and credit facilities following local necessity. Eventually, these measures can attract and encourage many new farmers into coconut cultivation and thereby achieving better advances in coconut farming.
Observation of gain operation mode in Ge:B BIB THz detector
Authors: Pan Changyi , Yin Ziwei , Mou Hao , Kang Tingting , Deng Huiyong , Wu Huizhen , Dai Ning 
Published: May 2021

Blocked impurity band (BIB) detectors play an important role in astronomical detection from the mid-infrared to THz region. We demonstrated the field dependence of the photoresponse in BIB detectors using both experimental results and theoretical calculations. It was found that there is a gain operation region between the saturation voltage of the photocurrent and the breakdown voltage of the dark current. The photoconduction gain in the gain operation region is several orders of magnitude larger than that in the other voltage range. Considering the field-assisted thermal ionization process and the photon-assisted impact ionization process, the gain operation mode can be well explained. Utilizing the gain operation mode, Ge:B BIB detectors can even detect the objects with a temperature as low as 10 K. We provide a theoretical basis to optimize BIB detectors and further improve their detection performance.
Rigid germs of finite morphisms of smooth surfaces and rational Belyi pairs
Authors: Kulikov Vik. S. 
Published: May 2021

Abstract
In the paper “On rigid germs of finite morphisms of smooth surfaces” (Sb. Math., 211:10 (2020), 1354–1381), we defined a map

from the set

of equivalence classes of rigid germs of finite morphisms branched in germs of curves having

singularity types onto the set

of rational Belyi pairs

, considered up to the action of

. In this article the inverse images of this map are investigated in terms of monodromies of Belyi pairs.
Bibliography: 7 titles.
Neural indicators of articulator-specific sensorimotor influences on infant speech perception
Authors: Choi Dawoon , Dehaene-Lambertz Ghislaine , Peña Marcela , Werker Janet F. 
Published: May 2021

Significance
In the adult brain, multimodal speech perception that interfaces with a bidirectional interaction of perception and production speech systems is increasingly accepted. Speech perception in infancy is already highly multisensory, suggesting an early emerging representation for speech across sensory modalities. We provide electrophysiological evidence for sensorimotor influences on auditory speech discrimination responses in 3-mo-old infants who are several months away from producing canonical babbling. Auditorily, infants discriminated both contrasts tested. However, a tongue-tip articulatory inhibition diminished the /ɗa/-/ɖa/ discrimination (both phones involve the tongue-tip movement as a place of articulation), whereas accentuating the /ba/-/ɗa/ discrimination (different articulators involved in the articulation of the two phones). These findings suggest that prebabbling infants’ speech perception is more robustly multisensory than previously considered.
Hydrocotyle ranunculoides (floating pennywort).
Authors: Djeddour Djami 
Published: May 2021

Abstract

H. ranunculoides is a perennial, aquatic plant native to the Americas. It was introduced outside of its native range through the aquatic nursery trade and has since naturalized in many countries around the world. Like many aquatic weeds, H. ranunculoides possesses a number of characteristics which contributes to its invasiveness: high growth rates, adaptability to prevailing nutrient conditions, very effective vegetative propagation, plasticity in growth response, overwintering to avoid low temperature stress, resistance to herbivory, resistance to chemical control, and absence of specific pests and diseases in introduced environments. Its rapid growth means that H. ranunculoides can produce dense, interwoven floating mats across slow-flowing waters. These mats restrict the light available for submerged macrophytes, decreases oxygen levels and therefore decrease the overall biodiversity of an area. It can also increase the risk of flooding and block channels. H. ranunuloides is considered a serious invader in Belgium, the Netherlands, and the UK in particular and was added to the EPPO alert list in 2004 (EPPO, 2004) and Schedule 9 of the Wildlife and Countryside Act in the UK. It is also banned from sale in the Netherlands. It has spread into water bodies in a number of other European countries including France, Belgium, Germany and Italy. In 2016, the European Commission's Implementing Regulation (2016/1141) was published, which includes H. ranunculoides among the list of 14 invasive alien plant species of Union concern.
Solanum elaeagnifolium (silverleaf nightshade).
Authors: Datiles Marianne Jennifer , Acevedo-Rodríguez Pedro 
Published: May 2021

Abstract

S. elaeagnifolium is a deep-rooted summer-growing perennial plant, native to the Americas, but now widely naturalized beyond its native range in extra-tropical regions. It is considered a tenacious weed in many arid to semi-arid places including India, Australia, South Africa, the Pacific Islands, and the USA (Holm et al., 1979; Wagner et al., 1999; Randall, 2012; USDA-ARS, 2014). It is known to be invasive in Cuba (Oviedo-Prieto et al., 2012) and Hawaii (PIER, 2014), a principal weed in India (Holm et al., 1979), and an agricultural weed in Java (Randall, 2012). It has been declared a noxious weed in the U.S. states of Arkansas, California, Idaho, Nevada, and Washington, and an "A" designated weed for quarantine in Oregon and Washington (USDA-NRCS, 2014). The species competes with crops, interferes with livestock, acts as a host for insects and plant diseases, and spreads by forming dense colonies from its extensive root system as well as by propagation of seeds (Boyd et al., 1984; Wagner et al., 1999; EPPO, 2007; PIER, 2014). The species is difficult to control without chemicals (UC Davis Weed Research and Information Center, 2013) and it is essential to keep it out of uncontaminated areas (EPPO, 2007). The species is known to be toxic to cattle, causing damage to intestinal tract and nervous systems and, in severe cases, can cause hallucinations, paralysis, and death (Mas and Lugo-Torres, 2013).
Carbon dioxide footprint reduction by retrofitting regional heating boilers from gaseous to biogenic fuels
Authors: Antonescu N. , Stanescu D. P. 
Published: May 2021

Abstract
Carbon dioxide footprint reduction can be reached by switching fossile combustible consumers to biogenic fuels. Using biogenic fuels, mainly cellulosic ones, requires burner replacement and most often a complete change of burning process by introducing pre-burning chambers. The boiler response is also to be studied because the changes in flue gases composition, debits and temperatures. The paper analyses the necessary burning installation retrofitting for the case of switching a local boiler from gaseous fuel functioning to cellulosic fuel functioning (sawdust or pellets). It is presented a calculation method for boiler functioning verification (determining the functioning parameters considering an existing boiler used in other than nominal conditions) with the aim of determining the parametrical and performances variations when using other fuels. The nominal functioning regime, for witch there are available experimental data, is used to validate the model and the computational program. Conclusions are drawn regarding the possibility and results for retrofitting regional heating boilers from gaseous to biogenic fuels.
An alternative solution for insulating a burning chamber with high temperature walls
Authors: Tacutu Laurentiu , Antonescu Nicolae 
Published: May 2021

Abstract
Usually, the industrial halls, who are in most cases poorly insulated and have high permeability, are heated with hot air generators or convecto-radiators. Using convecto-radiators is improper and hot air generators, although it is more appropriate, it consumes a very high amount of energy. This paper continues the topic discussed in a previous article [1] in which we presented an alternative heating solution to the existing ones. The heating system mentioned uses an environmentally friendly and cheap fuel (biomass). This paper presents an alternative solution to insulate a burning chamber (BC) with high temperature walls that uses pellets as fuel. This technical solution has the benefit of supplying heating agents to various types of heat consumers and to optimize the construction costs through the materials used. The BC is design with external ribs on here longitudinal direction. For insulating and cooling the BC, a metallic case was design through which atmospheric air is circulated. Three constructive solutions of BCs were analysed. The paper presents the modelling results of the constructive solutions and the calculation method. The calculation was made applying the physical laws that govern this type of heat transfer and was made with discretization segments. Determining the parameters of each segment will allow the user to optimize the equipment design. The main purpose of the study is to conceive an alternative technical solution for insulating the BC, that should be cheaper, easy to implement and able to prepare a second thermal agent for heating.
Thermal energy storage system applicable to vehicles
Authors: Banyai D V , Opruta D , Marcu I L , Merca C G 
Published: May 2021

Abstract
The paper presents the state of the art for thermal energy accumulators using the latent heat phase change usable in cars with either internal combustion engine or electric. The new materials with high storage capacity are presented and the most important achievements in this field of thermal energy storage on vehicles. The case study presented in the paper brings some information necessary for the development of thermal accumulators, with phase change materials, showing the important parameters and characteristics and what values they must have (e.g.: required and accumulated energy; charging and discharging time; latent heat, geometric characteristics). The paper presents a possible classification of these types of batteries, thus facilitating the development of products specific to the applications in which they are included. The work will continue with numerical and experimental studies on models developed based on the case study described here. If at present, in the case of electric cars, a reduction of approx. 20% of electricity was obtained by implementing thermal batteries with phase change material, then studies or research become necessary to accelerate their development on an industrial scale in competitive economic conditions.
Health Assessment and Indoor Environmental Quality in Multiple Romanian Rural Schools
Authors: Ghita S A , Catalina T , Lungu C 
Published: May 2021

Abstract
The current study was realized in three schools located in regional Romania. The results of this article draw upon the diversity of school’s typologies analyzed: new, existing refurbished and old. The analysis was carried using answers given by 138 children to a survey that covered questions related to their learning environment and health problems. Children were asked to rank the perceived quality of several indoor environment parameters (IAQ, outdoor air quality, illumination, noise), the stressful and friendly nature of the schools, and their overall satisfaction. The survey was accompanied by experimental measurements of air temperature, humidity, noise and illuminance levels, CO2 concentration and dust particles. The most prevalent symptoms experienced at school were sneezes (34.1%), fatigue (18.9%), runny nose (14.5%), stuffed/blocked nose (11.6%), and headache (8.7%). Out of the five main health symptoms reported at school, the majority has been recorded in the renovated school.
Mixture Between Fire and Mist Jets Characteristics for Flame Extinguish
Authors: Pavel D , Cozma P , Dimitriu S , Chisacof A , Safta C A 
Published: May 2021

Abstract
The extinguish process using the water mist jet is one of the most efficient system for hydrocarbon flame accidentally developed. The environmentally friendly of the system is an important challenge. Both free jets characteristics are analysed in aim to have a quick suppression of the flame. The paper is focused on the geometrical shape of the cone realised by every jet (flame and water mist). On this basis the relative position of the jets is decisive in aim to obtain the desired effect. Experimental measurements were made, and the results are presented in the paper including the infrared temperature field. The experimental analysis allows to find the adequate angle between jets for the flame extinction. So, the optimum position of the water mist jet applied on the fire was found. A thermal flame extinguish efficiency evaluation is presented, too. The system is non pollutant and the damages are reduced.
Analyses of wall surface condensation risk, based on CFD model with conventional room radiator
Authors: Ivanov M P , Mijorski S G 
Published: May 2021

Abstract
The presented paper reveals a numerical study of the risk of condensation over exterior wall of a typical residential room. The study is based on CFD methods with implemented conjugate heat transfer. The analysis is contributed by a study of the impact of the heat released from conventional room radiator with various heat loads. This way, the resulting surface and dew point temperature distributions are derived over the simulated exterior wall. The results demonstrate that with the increase of the room relative humidity, the percentage of the external wall area, which might be affected by condensation increases significantly. This effect is observed regardless of the selected increase of the radiator heat load (in this particular study, the range is between 1000 W and 1500 W). For the range of relative humidity values from 40% to 60%, the area with increased risk of condensation increases to above 80%. This result demonstrates the crucial importance of the control of the room relative humidity within occupied premises, especially if condensation mitigation measures must be applied. The presented analyses and assessment method are rather innovative for the presented engineering area and would be in help in the buildings and indoor environment design process.
Study on the behavior of a high reinforced concrete building with different kinds of partitioning masonry walls
Authors: Constantinescu S 
Published: May 2021

Abstract
The paper is a study on different types of masonry partitioning walls in a high rise reinforced concrete walls building. It will be built in Bucharest, Romania. The masonry walls are made of clay bricks for the first 4 cases studied and aerated concrete blocks for the last 2 cases. They are designed to bare the in plane and perpendicular efforts they are subjected to in the elastic stage. The effect these masonry walls have on the structures is shown. They have an important influence over the buildings natural vibration periods and the slabs reinforcement design and shear stresses. The plastic hinges development is shown for all 6 cases. The pushover diagrams are compared separately for directions X and Y.
Experimental study of water losses through a circular leakage hole in PVC pipes
Authors: Hotupan A , Hădărean A 
Published: May 2021

Abstract
The water loss is a phenomenon which attends the water supply system on its operating lifetime and it represents the difference between the water volume measured at the input of a water distribution network and the water volume billed to the end-users. The water loss reduction is an important topic for the water supplying companies and the knowledge of the real water volumes lost from a supply system is an essential element in water balance. The water losses may be classified in “real losses” and “apparent losses”: the apparent losses cannot be quantified, but the real losses can be estimated by calculus. The complexity of this phenomenon lies in the fact that this water losses can’t be calculated with a single equation, generally valid for each real situation. The equations mentioned in the technical literature can be applied to a specific situation. This paper presents an experimental study of the variation of the hydraulic parameters in a PVC water flow pipe in two cases: 1. normal operation and 2. leak simulation, when a circular hole is drilled into a PVC pipe. Furthermore, the results of this study are discussed and analysed in order to calculate the value of the leakage exponent N
1.
Overview of resilience: a concept to assess healthcare infrastructure preparedness against disasters. Evaluation of existing models and applicability to HVAC systems
Authors: Garrido-Píriz P , Botejara-Antúnez M , Sánchez-Barroso G , González-Domínguez J , García-Sanz-Calcedo J 
Published: May 2021

Abstract
Healthcare infrastructures are critical and have elements which are likely to fail or to get collapsed in disaster scenarios (earthquakes, pandemics, etc.). There are many parameters and factors to evaluate their preparedness, but resilience has outstood in recent investigations. Hospitals must not only be prepared for disasters to come, but also to reach the nominal operation in the aftermath as soon as possible, as these infrastructures play a critical role in modern societies. The aim of the study is to evaluate and assess different insights into resilience, as well as marking possible improvements, providing a deeper understanding about the topic and concepts that surround the definition of resilience. The result is the constitution of a new assessment tool based on semi-quantitative and quantitative models. The model can be scaled and applied to internal systems in healthcare infrastructure such as HVAC facilities.
Study of energy consumption in a wastewater treatment plant using logistic regression
Authors: Boncescu C , Robescu L D , Bondrea D A , Măcinic M E 
Published: May 2021

Abstract
The aim of this paper is to predict the energy consumption of a wastewater treatment plant from Romania, taking into account the flowrate, concentration of BOD, TSS, COD and the energy consumption. For the mathematical model the logistic regression was applied. The input data used were from a waste treatment plant in Romania, for a period of 2 years 2015 and 2017, a total of random 403 dataset. The treatment technologies of WWTP consist of advanced biological treatment SBR (nitrification, denitrification, and phosphorus removal), aerobic sludge stabilization, dewatering, storage and chemical disinfection. Octave software was used to build the model. The answer of the model refers to the fact that for a given situation there will be high energy consumption or low energy consumption in the wastewater treatment plant (WWTP). Performance of the model was compared with real value.
Experimental research on a hydrokinetic turbine model
Authors: Nedelcu A , Bunea F , Danca P A , Chihaia R A , Babutanu C A , Marin D , Ciocan G D 
Published: May 2021

Abstract
The renewable energy policy strongly encourages the use of all renewable sources of energy. ICPE-CA starts to develop a new hydrokinetic turbine to be implemented in small rivers or water channels with a low investment cost. In a first step, the characterization of a laboratory reduced scale turbine model is performed. The hydrokinetic turbine model is implemented in a free surface water channel. The produced power for many flow rates and rotation speed of the turbine, as well as the detailed flow characterization (PIV measurements) are presented.
Experimental and numerical investigation of plain concrete columns strengthening by FRCM composite material
Authors: Hasan H , Pascu R , Georgescu D P 
Published: May 2021

Abstract
The Fibre Reinforced Cementitious Matrix (FRCM) composite material is a relatively new retrofitting system which overcomes the limitations related with the use of organic adhesives. FRCM system is used to increase the strength and overall ductility of masonry and concrete structures. This paper presents the results of an experimental program on plain concrete columns strengthened by FRCM under uniaxial compression loading. Six columns of square 30x30 cm cross-section and 100 cm height made of low-strength concrete were cast in place. Two columns without confinement are used as reference, while two columns with one layer of FRCM and two columns with two layers of FRCM are used to investigate the influence of FRCM confinement level. The FRCM system consists of high-strength carbon fibre mesh and cementitious mortar. The performance of FRCM strengthened columns is evaluated in terms of ultimate axial load carrying capacity, ultimate axial deformation, ultimate stress and ultimate strain. The experimental results are also compared with the numerical results obtained according to ACI 549.4R-13 code.
The Reduced Stress Method (EN-1993-1-5) In Designing of The Plated Structural Elements
Authors: Tawfeeq Al-Aqbi Ameer , Popa Nicolae 
Published: May 2021

Abstract
The paper describes the main features and advantages of European standard EN 1993-1-5 in the design of plated structures. Compared to other types of steel structures, plated structures are more prone to local buckling and therefore required design rules to cover such a phenomenon. The concept of the article focuses on The Reduced Stress Method. A steel box girder chooses for numerical example was fabricated of S235 steel, has 7 panels with transverse and longitudinal stiffeners and was tested in 1985 at the Testing Laboratory of the Research Institute for Transportation Engineering, in Bucharest.