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Alternative beneficiation of tantalite and removal of radioactive oxides from Ethiopian Kenticha pegmatite–spodumene ores

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International Journal of Minerals,Metallurgy and Materials 2017年第7期24卷 727-735页

作者： Berhe Goitom Gebreyohannes velázquez del rosario alberto Abubeker Yimam Girma Woldetinsae Bogale Tadesse School of Materials Science and Engineering Jimma Institute of Technology Jimma University P.O. Box 378 Jimma Ethiopia Chemistry Department College of Natural and Computational Science Mekelle University P.O. Box 823 Mekelle Ethiopia School of Chemical and Bio Engineering AAiT Addis Ababa University P.O. Box 1176 Addis Ababa Ethiopia Research and Development Directorate Federal Democratic Republic of Ethiopia Ministry of Mines Petroleum and Natural Gas P.O. Box 486 Addis Ababa Ethiopia Department of Mining Engineering and Metallurgical Engineering Western Australian School of Mines Curtin University Egan St Kalgoorlie WA 6430 Australia

The beneficiation methods for Ethiopian Kenticha pegmatite–spodumene ores were assessed through mineralogical and quantitative analyses with X-ray diffraction（XRD） and energy-dispersive X-ray fluorescence（EDXRF）. The tantalite in the upper zone of the Kenticha pegmatite–spodumene deposit is 58.7wt% higher than that in the inner zone. XRD analysis revealed that the upper zone is dominated by manganocolumbite, whereas the inner zone is predominantly tantalite-Mn. Repeated cleaning and beneficiation of the upper-zone ore resulted in concentrate compositions of 57.34wt% of Ta_2O_5 and 5.41wt% of Nb_2O_5. Washing the tantalite concentrates using 1vol% KOH and 1 M H_2SO_4 led to the removal of thorium and uranium radioactive oxides from the concentrate. The findings of this study suggest that the beneficiation and alkaline washing of Kenticha pegmatite–spodumene ores produce a high-grade export-quality tantalite concentrate with negligible radioactive oxides.

关键词： beneficiation manganocolumbite pegmatite-spodumene radioactive oxides tantalite

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Refractive outcomes after V4c Toric collamer lens implantation over 1y of follow-up

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International Journal of Ophthalmology(English edition) 2024年第7期17卷 1322-1330页

作者： Humberto Carreras-Díaz Josefina Reñones de Abajo María del rosario Carreras-Díaz Amalia Lorente-velázquez Vithas Eurocanarias Las Palmas de Gran Canaria 35004Spain University Hospital of Girona Doctor Josep Trueta Gerona 17007Spain Departament of Optometry and Vision Faculty of Optics and OptometryComplutense University of MadridMadrid 28040Spain

AIM:To evaluate refractive outcomes and corneal astigmatism changes after Toric implantable collamer lens with a central port(V4c T-ICL)implantation over 1y of ***:A retrospective study was performed including 50 eyes of 50 patients that underwent V4c T-ICL ***(UDVA)and corrected(CDVA)distance visual acuities,refraction,refractive and corneal astigmatism changes and corneal coupling correction were evaluated preoperatively,1 and 12mo *** analysis was used for astigmatism *** of adjustment(CAdj)was calculated for corneal coupling ***:The mean UDVA achieved was 0.03 logMAR at 1mo and remained unchanged throughout the whole follow-up(P=0.193).At the last visit,84%of the eyes achieved a CDVA of 0.00 logMAR or *** spherical equivalent refraction(SEQ),96%of eyes were ranges of±1.00 D and 84%of them within±0.50 ***,94%of eyes had a remaining refractive cylinder within±1.00 D and 78%of them within±0.50 ***,SEQ and refractive cylinder,remain stable over the postoperative follow-up(P=1.000 and P=0.660,respectively).In terms of surgically induced astigmatism(SIA),no statistically significant differences were found over the follow-up(P=0.102)and under correction was found with a correction index lower than the unit at each visit.A keratometric astigmatism induced of 0.59±0.53(vector mean:0.26×73º)D was reached at the last *** significant changes in terms of corneal astigmatism orientation were reported over post-surgery visits(P=0.129 and P=0.097 at 1 and 12mo respectively).No clinical significance was found for CAdj on with-the-rule *** postoperative complications resulting from the surgery were ***:Refractive outcomes suggest that the V4c T-ICL implantation for correction of myopic astigmatism was satisfactory in terms of effectiveness,safety,and stability during 1y of *** astigmatism induced by the incision around 0.5 D is achieved

关键词： V4c Toric collamer lens corneal astigmatism surgically induced astigmatism corneal coupling

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The differences in carbon dynamics between boreal dwarf shrubs and Scots pine seedlings in a microcosm study

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Journal of Plant Ecology 2018年第5期11卷 709-716页

作者： Liisa Kulmala Maria del rosario Dominguez Carrasco Jussi Heinonsalo Department of Forest Sciences University of HelsinkiLatokartanonkaari 700014 HelsinkiFinland Department of Food and Environmental Sciences University of HelsinkiViikinkaari 900014 HelsinkiFinland

Aims The ground level of boreal pine forests consists of a dense layer of eri-caceous shrubs,herbs,grasses,mosses and *** primary prod-uctivity of this forest floor vegetation is notable but the role the most common ericoid dwarf shrub plant species,Calluna vulgaris,Vaccinium myrtillus and Vaccinium vitis-idaea,play in carbon(C)cycling in these ecosystems is poorly ***,we studied their C dynamics in detail using plants of similar size(age 14-19 months)in a microcosm *** We determined the full C balances of these dwarf shrubs for the first time and compared them to those of Pinus sylvestris by using long-term biomass accumulation,^(13)C pulse labelling and CO_(2) ex-change measurements in a controlled laboratory *** Findings Pinus sylvestris had significantly higher biomass-based C fluxes than dwarf shrubs,both aboveground and belowground,but the dwarf shrubs did not differ in the biomass-based *** showed that root respiration of the evergreen ericoid dwarf shrubs was sensitive to the aboveground light conditions as belowground respiration was 50-70%higher under light compared with dark *** light-related dif-ferences were not observed for Scots *** observed differences in C dynamics are important in estimating the origin of belowground CO_(2) fluxes and in evaluating their biological *** results improve current understanding of CO_(2) sources and sinks in boreal ecosystems.

关键词： photosynthesis autotrophic respiration NPP ^(13)C labelling

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Statins decrease the risk of acute pancreatitis after endoscopic ultrasound fine-needle aspiration of pancreatic cysts

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Hepatobiliary & Pancreatic Diseases International 2020年第1期19卷 74-79页

作者： Antonio Facciorusso Vincenzo rosario Buccino Valentina del Prete Matteo Antonino Antonella Contaldo Nicola Muscatiello Gastroenterology Unit Department of Medical Sciences University of Foggia AOU Ospedali Riuniti

Background: Basic and clinical studies suggest that statins may prevent and even ameliorate acute pan- creatitis. The present study was to evaluate whether statin decreases the risk of acute pancreatitis in patients undergoing endoscopic ultrasound-guided ne-needle aspiration of pancreatic cysts. Methods: Out of 456 patients with pancreatic cysts referred to our center between 2006 and 2018, 365 were nally included in analyses: 86 were treated with statins and 279 were not at the time of endo- scopic ultrasound ne-needle aspiration. We compared the acute pancreatitis incidence between the two groups, and we also compared other complications such as bleeding and infections. Results: Median age was 64 years [interquartile range (IQR) 62 69] and median cyst size was 24mm (IQR, 21 29). The most frequent histology was intraductal papillary mucinous neoplasm (45.3% and 42.3% in the two groups, respectively;P =0.98). All 13 patients experiencing post-endoscopic ultrasound acute pancreatitis were from the control group (4.7%), of which 3 were classi ed as severe pancreatitis. None of statin users developed post-procedural acute pancreatitis (odds ratio: 0.15;95% con dence interval: 0.03 0.98;P=0.03). No difference was registered with regard to severe pancreatitis and other complications. Conclusions: Statins exert a bene cial role in preventing acute pancreatitis in patients with pancreatic cysts undergoing endoscopic ultrasound-guided ne-needle aspiration. If con rmed in prospective trials, our ndings may pave the way to an extensive use of statins as prophylactic agents in pancreatic inter- ventional endoscopy.

关键词： Endoscopic ultrasound Fine-needle aspiration Pancreas Lesion

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Seronegative disseminated Bartonella spp. infection in an immunocompromised patient

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Asian Pacific Journal of Tropical Medicine 2016年第12期9卷 1197-1200页

作者： Claudia Weilg Olguita del Aguila Fernando Mazulis Wilmer Silva-Caso Carlos Alva-Urcia rosario Cerpa-Polar Erick Mattos-Villena Juana del Valle Mendoza Medicine School Research Center and Innovation of the Health Sciences FacultyUniversidad Peruana de Ciencias Aplicadas Pediatric Service Hospital Nacional Edgardo Rebagliati Martins Molecular biology laboratory Instituto de Investigación Nutricional Pediatric Hematology Service Hospital Edgardo Rebagliati Martins

An 11 year old, hispanic girl with a history of B-cell acute lymphoblastic leukemia was admitted to the hospital for symptoms compatible with Bartonella henselae infection. The first molecularly diagnosed case of disseminated Bartonella henselae infection was reported in an immunocompromised patient in Lima, Peru. The analysis was confirmed by Polymerase Chain Reaction and automated sequencing of a liver biopsy sample, even though the serologic tests were negative. In conclusion, Bartonella spp. infection should have a particular diagnostic consideration in immunocompromised patients with fever of unknown origin and further investigation regarding the patient's past exposures with cats should also be elicited.

关键词： Bartonella spp. Bartonella henselae B-cell acute lymphoblastic leukemia Peru

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Toxicity of Mexican native plant extracts against larvae of Aedes aegypti(Diptera: Culicidae)

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Asian Pacific Journal of Tropical Biomedicine 2015年第4期5卷 287-291页

作者： rosario Ruiz-Guerrero Mario alberto Rodríguez-Pérez Mariano Norzagaray-Campos CIITEC-IPN Cerrada de Cecati S/N. Col. Santa Catarina Azcapotzalco Centro de Biotecnología Genómica-IPN Blvd. Del Maestro S/N Colonia Narciso Mendoza CIIDIR-IPN-Sinaloa Bulevar Juan de Dios Bátiz Paredes No 250 Colonia San Joachin. Guasave

Objective: To evaluate five indigenous Mexican plants [Hippocratea excelsa, Hippocratea celastroides, Argemone mexicana(A. mexicana), Tagetes lucida, and Pseudosmodingium perniciosum(P. perniciosum)] toxicity against the fourth instar larvae of the dengue primary vector, Aedes aegypti(A. aegypti).Methods: Each plant part was treated successively with hexane, ethyl acetate, acetone, and methanol to extract potential active components of the plants against the dengue ***: There was a range of toxicity at 24 or 48 h post-exposure for the different plant parts and organic solvent used(LC50 values ranged between 20 and 890 μg/mL). Extracts from seeds of A. mexicana(hexane washing with methanol and acetone) and stem-bark of P. perniciosum(hexane) showed highest toxicity to Ae. aegypti larvae at 48 h post-exposure(LC50 values were80, 50, and 20 μg/mL, respectively), thus making them potential candidates as *** are on-going to characterize the bioactive components of the extracts, through chromatography, for their use as biological tools for the control of the primary dengue ***: A. mexicana and P. perniciosum are good candidates to combat the dengue vector, Ae. aegypti, as they were highly toxic to the larvae.

关键词： Aedes aegypti Dengue Larvicidal activity Plant organic extracts

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Benefits Realization Management Framework to Ensure the Creation and Timely delivery of Public Value in Uruguay

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Belt and Road Initiative Tax Journal 2022年第1期3卷 95-103页

作者： Maria del rosario Rodriguez Barbieri Planning and Management Control Department Direccion General Impositiva Uruguay

The aim of this article is to share the experience in enhancing tax administration capacity building to manage benefits *** 2020 the Uruguayan Tax Administration implemented the Benefits Realization Management framework through the application of the DGI Business Case Preparation Methodology and the DGI Benefits Management General *** article describes the main characteristics of both methodologies,their implementation process,the results obtained,and the actions that have been planned to be carried out to consolidate such practices in the *** also analyzes the relationship between benefits realization,organizational strategy,portfolio management,and public value creation.

关键词： Benefit Realization Management Business Case Tax administration Public value

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Operations Research:Providing Value to Internal and External Clients

Operations Research:Providing Value to Internal and External...

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中国运筹学会第九届学术交流会

作者： Elise del rosario 11 Eastwood Ave Eastwood City Cyberpark LibisQuezon City 1110Philippines

In this paper,the speaker shares extensive experience in tackling management problems through the use of Operations Research tools. Application areas are discussed in the context of an internal OR group serving client...

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Challenges Ahead for the Second 50 years of IFORS and the ORSC

Challenges Ahead for the Second 50 years of IFORS and the OR...

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中国运筹学会第九届学术交流会

作者： Elise del rosario 11 Eastwood Ave Eastwood City Cyberpark LibisQuezon City 1110Philippines

The International Federation of Operational Research Societies(IFORS) celebrates 50 years of service to the OR *** up to develop operations research as a unified science and to advance it in all the nations of the world,the organization sponsors international meetings,facilitates exchange of information on operational research,encourages

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Encephalitis with convulsive status in an immunocompetent pediatric patient caused by Bartonella henselae

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Asian Pacific Journal of Tropical Medicine 2016年第6期9卷 591-594页

作者： rosario Cerpa Polar Gabriela Orellana Wilmer Silva Caso José Sánchez Carbonel Javier Santisteban Juana del Valle Mendoza Javier Santisteban Infectogía Pediátrica Servicio de Pediatría Especializada Hospital Edgardo Rebagliati Martins Neurologia Pediátrica Hospital Edgardo Rebagliati Martins School of Medicne Faculty of Health Sciences Universidad Peruana de Ciencias Aplicadas Faculty of Health Sciences Research Center of the Faculty of Health Sciences Universidad Peruana de Ciencias Aplicadas Clínica Pediatrica Hospital Edgardo Rebagliati Martins

Cat scratch's disease caused by Bartonella henselae, is known to be a self-limited benign process in immunocompetent children. The association with neurologic manifestations is very uncommon especially in patient with no immunologic defects and in cases without specific treatment. A 7 years old male patient, without any immunocromised defect, presented an atypic presentation of the cat scratch disease. The patient came to the hospital in two opportunities in a status epilepticus, in both cases the diagnosis was encephalitis by Bartonella henselae and the evolution with treatment was monitored with PCR(polymerase chain reaction) in cerebrospinal fluid and blood, as well as IFI(IgM, IgG) serology(indirect immunofluorescence). The patient had a favorable clinical and laboratory evolution for 6 months showing no recurrence of the disease.

关键词： Bartonella henselae Encephalitis Immunocompetent Pediatric patient Convulsive status Cat scratch’s disease

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