检索结果-南通市图书馆

A visual analytics workflow for probabilistic modeling

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Visual Informatics 2023年第2期7卷 72-84页

作者： Julien Klaus Mark Blacher Andreas Goral Philipp lucas Joachim Giesen Friedrich Schiller University Jena Germany

Probabilistic programming is a powerful means for formally specifying machine learning *** inference engine of a probabilistic programming environment can be used for serving complex queries on these *** of the current research in probabilistic programming is dedicated to the design and implementation of highly efficient inference *** less research aims at making the power of these inference engines accessible to non-expert *** programming means writing *** many potential users from promising application areas such as the social sciences lack programming *** prompted recent efforts in synthesizing probabilistic programs directly from ***,working with synthesized programs still requires the user to read,understand,and write some code,for instance,when invoking the inference engine for answering ***,we present an interactive visual approach to synthesizing and querying probabilistic programs that does not require the user to read or write code.

关键词： Probabilistic inference Bayesian network Structured query language Table-based visualization

On the impact of grinding conditions in the flotation of semi-soluble salt-type mineral-containing ores driven by surface or particle geometry effects?

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Mining Science and Technology 2023年第7期33卷 855-872页

作者： lucas Pereira Nathalie Kupka Duong Huu Hoang Bruno Michaux Sondos Saquran Doreen Ebert Martin Rudolph Helmholtz-Zentrum Dresden-Rossendorf Helmholtz Institute Freiberg for Resource TechnologyFreiberg 09599Germany Maelgwyn Mineral Services Ltd Cardiff CF244PAUnited Kingdom

Grinding and flotation processes are often studied independently, despite the well-established grinding influence on flotation performance, which affects not only particle size and thus liberation but also shape and leads to complex changes in pulp chemistry affecting the particle surface properties relevant for selective bubble attachment. Yet, no study jointly investigated these possible causes and many are limited to single mineral flotation. We relate grinding conditions to changes in pulp chemistry and particle surface properties and assess their impact on upgrading. We studied three non-sulfide ores with different feed grades and valuables: scheelite, apatite, and fluorite. These were dry-, wet-, and wet conditionedground before flotation in a laboratory mechanical cell. Results were evaluated with bulk-and particle-specific methodologies. The selectivity of the process is higher after dry grinding for the fluorite and apatite ores and irrelevant for the scheelite ore. Variations in flotation kinetics of individual particles associated to their size and shape are not sufficient to explain these results. The higher concentration of Ca2+and Mg2+observed in the pulp after wet grinding, altering particle surface properties, better explains the phenomenon. Additionally, we demonstrate how particle shape impacts are system specific and related to both entrainment and true flotation.

关键词： Grinding-flotation interactions Semi-soluble salt-type minerals Geometallurgy Particle-based separation modelling Surface interactions

The Global Leprosy Assessment Index(GLAI):A new approach for measuring the severity of disease in Brazil

在线全文

学校读者我要写书评

暂无评论

Infectious Medicine 2023年第2期2卷 128-135页

作者： lucas Silva Thiago Rocha Dalson Figueiredo Filho Department of Medicine Universidade Estadual de Ciências da Saúde do Estado de AlagoasMaceio 57010-382ALBrazil Department of Political Science Universidade Federal de PernambucoRecife 50670-901PEBrazil

Background:In Brazil,the Ministry of Health(MH)monitors leprosy using 15 indicators,with the aim of imple-menting and evaluating evidence-based public ***,an excessive number of variables can compli-cate the definition of objectives and verification of epidemiological ***:In this paper,we develop the Global Leprosy Assessment Index(GLAI),a composite measure that integrates two key dimensions for the control the disease:epidemiological and *** a confirmatory factor analysis model to examine 2020 state-level data,we have standardized GLAI to a range of 0 to ***:Higher values within this range indicate a greater severity of the *** mean value of the GLAI was 0.67,with a standard deviation of *** has the highest value,followed by Paraíba with 0.88 while Tocantins records the lowest value of the indicator,followed by Mato Grosso with *** epidemiological and operational indicators have a positive but statistically insignificant correlation(r=0.25;p-value=0.20).Conclusions:The development of evidence-based public policies depends on the availability of valid and reliable *** GLAI presented in this paper is easily reproducible and can be used to monitor the disease with disaggregated ***,the GLAI has the potential to serve as a more robust parameter for evaluating the impact of actions designed to eradicate leprosy in Brazil.

关键词： Leprosy Transmissible disease control Public health policy Health indicator Factor analysis

Rice Germination and Its Impact on Technological and Nutritional Properties:A Review

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Rice science 2022年第3期29卷 201-215页

作者： lucasÁvila do NASCIMENTO Abhilasha ABHILASHA Jaspreet SINGH Moacir Cardoso ELIAS Rosana COLUSSI Department of Agroindustrial Science and Technology Federal University of PelotasPelotasUniversity Campuss/n96010-900PelotasRSBrazil Riddet Institute and Massey Institute of Food Science and Technology Massey UniversityPalmerston NorthNew Zealand Center for Chemical Pharmaceutical and Food SciencesFederal University of PelotasPelotasUniversity Campuss/n96010-900PelotasRSBrazil

Grain germination is a process involving numerous factors that influence the biochemical processes inside the plant *** review covered the abiotic factors that lead to the germination and significantly impact the nutritional properties and digestion behavior of rice *** macro-and micro-nutrients can be changed depending on the intensity of the applied variables during *** instance,germination time can increase the protein content in the grain and concurrently reduce its protein *** most cases,the number of bioactive compounds present in rice grains are increased regardless of germination *** can promote the complexation of nutrients and thus negatively interfere with the digestibility of *** review highlighted the influence of the germination process on the nutritional quality of rice grains,providing information about the germination conditions and their impacts on the anabolic and catabolic reactions of the grain,emphasizing the health benefits.

关键词： germinated rice nutritional aspect germination condition digestibility advantage

Short-term changes in soil properties after prescribed fire and mulching with fern in Mediterranean forests

在线全文

学校读者我要写书评

暂无评论

Journal of Forestry Research 2022年第4期33卷 1271-1289页

作者： Bruno Gianmarco Carra Giuseppe Bombino Manuel Esteban lucas-Borja Adele Muscolo Federico Romeo Demetrio Antonio Zema AGRARIA Department Mediterranean University of Reggio CalabriaLoc.Feo di Vito89122 Reggio CalabriaItaly Department of Agroforestry Technology and Science and Genetics School of Advanced Agricultural and Forestry EngineeringThe University of Castilla-La ManchaCampus Universitario s/n02071 AlbaceteSpain

Prescribed fire,although having low intensity and being able to reduce the risk of wildfire may modify soil properties in the short term,with possible increases in runoffand erosion *** mulching with vegetation residues is one of the most common post-fire management *** of fern,which is abundant on the Mediterranean forest floor,may be used to replace straw for mulching fireaffected ***,the effects of prescribed fires are not completely understood,and there is no data regarding the use of fern to protect soil after fire in the *** fill this gap,selected soil chemical parameters were analyzed,on a comparative basis,in three Mediterranean forests(pine,oak and chestnut)in Calabria(Southern Italy).These parameters were measured immediately and one year after fire in unburned,burned and not treated,and burned and mulched *** in soil chemical properties among the different treatments were significant,and the effects of the prescribed fire and mulching were dependent on the time elapsed from their application and forest *** general,mulching was not effective in limiting the changes in the monitored soil properties compared to the pre-fire *** forest species showed different temporal trends in changes of soil properties.

关键词： Organic matter Nutrients Macro-elements Vegetation cover Post-fire management

Toxicological effects of mining hazard elements

在线全文

学校读者我要写书评

暂无评论

Energy Geoscience 2022年第3期3卷 255-262页

作者： Leonardo lucas da Silva-Rego Leonardo Augusto de Almeida Juciano Gasparotto Instituto de Ciencias Biomedicas-Universidade Federal de Alfenas AlfenasMinas GeraisRua Gabriel Monteiro da Silva700CEP:37130-001Centro-Alfenas/MGBrazil

Mining plays a prominent role in the economy worldwide since human efforts have been more concentrated in extraction than recycling of natural *** composed of various minerals vary according to the geological *** are raw materials for the conventional industries or fossil fuels for power *** can also be used in new *** mining industry triggers intense environmental *** exposure to multiple small particles from mining effluent,such as dust,uranium,iron,lead,zinc,silicon,titanium,sulfur,nitrogen,platinum,chromium,vanadium,manganese,and mercury,is a health *** elements can have several pathological effects,such as respiratory and cardiovascular,multiple chronic inflammation,and neurodegenerative ***,mining results in severe soil,water(surface and aquifer),and air contamination,reaching large areas far away from the *** of mining companies,with the recovery of ancient mined areas during the early development of environmental laws and regulations,compromises environmental integrity for more extended periods,increasing coverage of the affected *** review evaluates the toxicological effects on humans exposed to the mining wastes and the impact of these compounds on the *** results of our evaluation can be used by the government,manufacturers,scientists,private environmental organizations,decision-makers,and readers from different areas of knowledge to explore the potential risk of mining to the ecosystem and human health.

关键词： Mining operation Toxicology Environmental impact Ecosystem Human health

Success rates and predictors of outcomes of type I tympanoplasty performed by residents in a teaching tertiary hospital

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

中华耳科学杂志:英文版 2023年第4期18卷 214-219页

作者： lucas Resende Lucinda Mangia Nicole Tassia Amadeu Maurício da Silva Oliveira lucas Santin Patzer Eduardo de Souza Somensi Rogerio Hamerschmidt Department of Otolaryngology and Head and Neck Surgery Complexo Hospital de Clínicas-Universidade Federal Do Parana(CHC-UFPR)CuritibaBrazil Complexo Hospital de Clínicas-Universidade Federal Do Parana(CHC-UFPR) Curso de MedicinaCuritibaBrazil

Several technical variations of tympanoplasty have been reported,usually involving the type of graft and/or instruments *** studies have focused on the outcome of type-1 tympanoplasty specifically in teaching *** aimed to describe the results of type-1 tympanoplasty performed by residents,and to investigate potential predictive factors of surgical *** do so,we did a retrospective analysis of medical records of patients who underwent type-1 tympanoplasty in a tertiary university *** evaluated the tympanic membrane closure and audiometric outcomes during the first year of follow-up,and compared the results according to some clinical and surgical factors.130 operated ears were included in the *** closure rate reached 84.12%after one month and 72.72%after twelve months of *** mean air-bone gap was 22.98 dB preoperatively,and reached 10.55 dB after *** closure rates were 85%and 57.14%for those operated by endoscopic and microscopic-assisted approaches,respectively(p?0.004).The use of cartilage grafts and time without otorrhea of more than three months prior to surgery were also predictors of surgical success(p?0.002 and 0.041,respectively).Gender,age,perforation size,contralateral disease,operated side,reoperation,and degree of hearing loss did not significantly interfere with *** showed good overall results when performed by residents,although inferior to those reported by experienced *** use of the endoscope,cartilage grafting,and longer preoperative time without otorrhea were predictors of surgical success in this scenario.

关键词： Tympanoplasty Treatment outcome Video-assisted surgery

Acoustic signal dominance in the multimodal communication of a nocturnal mammal

在线全文

学校读者我要写书评

暂无评论

Current Zoology 2022年第5期68卷 592-599页

作者： Chun-Mian Zhang Cong-Nan Sun Jeffrey R lucas Jiang Feng Ting-Lei Jiang Jilin Provincial Key Laboratory of Animal Resource Conservation and Utilization Northeast Normal University2555 Jingyue StreetChangchun 130117China Key Laboratory of Vegetation Ecology of Education Ministry Institute of Grassland ScienceNortheast Normal University2555 Jingyue StreetChangchun 130117China Department of Biological Sciences Purdue UniversityWest LafayetteIN 47907USA College of Life Science Jilin Agricultural University2888 Xincheng StreetChangchun 130118China

Multimodal communication in animals is common,and is particularly well studied in signals that include both visual and auditory *** signals that combine acoustic and olfactory components are less well *** communication plays a crucial role in agonistic interactions in many mammals,but relatively little is known about this type of communication in nocturnal ***,we used male Great Himalayan leaf-nosed bats Hipposideros armiger to investigate multimodal signal function in acoustic and olfactory aggressive *** monitored the physiological responses(heart rate[HR])when *** was presented with 1 of 3 stimuli:territorial calls,forehead gland odors,and bimodal signals(calls+odors).Results showed that *** rapidly increased their HR when exposed to any of the 3 ***,the duration of elevated HR and magnitude of change in HR increased significantly more when acoustic stimuli were presented alone compared with the presentation of olfactory stimuli *** contrast,the duration of elevated HR and magnitude of change in HR were significantly higher with bimodal stimuli than with olfactory stimuli alone,but no significant differences were found between the HR response to acoustic and bimodal *** previous work showed that acoustic and chemical signals provided different types of information;here we describe experiments investigating the responses to those *** results suggest that olfactory and acoustic signals are non-redundant signal components,and that the acoustic component is the dominant modality in male ***,at least as it related to *** study provides the first evidence that acoustic signals dominate over olfactory signals during agonistic interactions in a nocturnal mammal.

关键词： acoustic agonistic interactions heart rate Hipposideros armiger multimodal communication olfaction

New guidance for using t-SNE:Alternative defaults,hyperparameter selection automation,and comparative evaluation

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Visual Informatics 2022年第2期6卷 87-97页

作者： Robert Gove lucas Cadalzo Nicholas Leiby Jedediah M.Singer Alexander Zaitzeff Two Six Technologies USA

We present new guidelines for choosing hyperparameters for t-SNE and an evaluation comparing these guidelines to current *** guidelines include a proposed empirically optimum guideline derived from a t-SNE hyperparameter grid search over a large collection of data *** also introduce a new method to featurize data sets using graph-based metrics called scagnostics;we use these features to train a neural network that predicts optimal t-SNE hyperparameters for the respective data *** neural network has the potential to simplify the use of t-SNE by removing guesswork about which hyperparameters will produce the best *** evaluate and compare our neural network-derived and empirically optimum hyperparameters to several other t-SNE hyperparameter guidelines from the literature on 68 data *** hyperparameters predicted by our neural network yield embeddings with similar accuracy as the best current t-SNE *** our empirically optimum hyperparameters is simpler than following previously published guidelines but yields more accurate embeddings,in some cases by a statistically significant *** find that the useful ranges for t-SNE hyperparameters are narrower and include smaller values than previously reported in the ***,we also quantify the potential for future improvements in this area:using data from a grid search of t-SNE hyperparameters we find that an optimal selection method could improve embedding accuracy by up to two percentage points over the methods examined in this paper.

关键词： Dimensionality reduction Machine learning t-SNE