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An ultra-compact particle size analyser using a CMOS image sensor and machine learning

Light(Science & Applications) 2020年第1期9卷 1809-1819页

作者： Rubaiya Hussain Mehmet Alican Noyan Getinet Woyessa Rodrigo R.Retamal Marin Pedro Antonio Martinez Faiz M.Mahdi Vittoria Finazzi Thomas A.Hazlehurst Timothy N.Hunter Tomeu Coll Michael Stintz frans muller Georgios Chalkias Valerio Pruneri ICFO-Institut de Ciencies Fotoniques The Barcelona Institute of Science and Technology08860 Castelldefels(Barcelona)Spain Ipsumio B.V. High Tech Campus5656 AEEindhovenNetherlands Department of Photonics Engineering Technical University of DenmarkDK-2800 Kgs LyngbyDenmark Research Group Mechanical Process Engineering Institute of Process Engineering and Environmental TechnologyTechnische Universitat DresdenMunchner Platz 3D-01062 DresdenGermany School of Chemical and Process Engineering University of LeedsLeeds LS29JTUK IRIS Technology Solutions SL08860 Castelldefels(Barcelona)Spain ICREA-Institucio Catalana de Recerca i Estudis Avançats 08010 BarcelonaSpain

Light scattering is a fundamental property that can be exploited to create essential devices such as particle *** most common particle size analyser relies on measuring the angle-dependent diffracted light from a sample illuminated by a laser *** to other non-light-based counterparts,such a laser diffraction scheme offers precision,but it does so at the expense of size,complexity and *** this paper,we introduce the concept of a new particle size analyser in a collimated beam configuration using a consumer electronic camera and machine *** key novelty is a small form factor angular spatial filter that allows for the collection of light scattered by the particles up to predefined discrete *** filter is combined with a light-emitting diode and a complementary metal-oxide-semiconductor image sensor array to acquire angularly resolved scattering *** these images,a machine learning model predicts the volume median diameter of the *** validate the proposed device,glass beads with diameters ranging from 13 to 125μm were measured in suspension at several *** were able to correct for multiple scattering effects and predict the particle size with mean absolute percentage errors of 5.09% and 2.5% for the cases without and with concentration as an input parameter,*** only spherical particles were analysed,the former error was significantly reduced(0.72%).Given that it is compact(on the order of ten cm)and built with low-cost consumer electronics,the newly designed particle size analyser has significant potential for use outside a standard laboratory,for example,in online and in-line industrial process monitoring.

关键词： particle size angular

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Fe_(3)O_(4)对黄铜矿在酸性硫酸铁溶液中铜溶解氧化还原反应的影响

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Transactions of Nonferrous Metals Society of China 2024年第6期34卷 1965-1975页

作者： Kolela J NYEMBWE Elvis FOSSO-KANKEU frans WAANDERS Martin MKANDAWIRE Didier K NYEMBWE Bhekie B MAMBA Water Pollution Monitoring and Remediation Initiatives Research Group School of Chemical and Minerals EngineeringFaculty of EngineeringNorth-West UniversityPotchefstroomSouth Africa Department of Mining Engineering College of Science Engineering and TechnologyUniversity of South AfricaFlorida Science CampusJohannesburgSouth Africa Department of Metallurgy Faculty of Engineering and Built EnvironmentUniversity of JohannesburgDoornfonteinJohannesburgSouth Africa Department of Chemistry School of Science and TechnologyCape Breton UniversityCanada School of Mining Metallurgy and Chemical EngineeringFaculty of Engineering and the Built EnvironmentUniversity of JohannesburgJohannesburgSouth Africa Institute for Nanotechnology and Water Sustainability College of Science Engineering and TechnologyUniversity of South AfricaFlorida Science CampusJohannesburgSouth Africa

由于钝化层的形成,黄铜矿(CuFeS_(2))在氧化条件下浸出通常具有溶解速率缓慢的特点。为了将黄铜矿浸出过程中的钝化效应降至最低并提高铜的回收率,研究了CuFeS_(2)在不同pH值(1.0、1.5和1.8)和温度(25和50℃)条件下浸出时,向Fe_(2)(SO_(... 详细信息

由于钝化层的形成,黄铜矿(CuFeS_(2))在氧化条件下浸出通常具有溶解速率缓慢的特点。为了将黄铜矿浸出过程中的钝化效应降至最低并提高铜的回收率,研究了CuFeS_(2)在不同pH值(1.0、1.5和1.8)和温度(25和50℃)条件下浸出时,向Fe_(2)(SO_(4))_(3)−H_(2)SO_(4)浸出剂中添加磁铁矿(Fe_(3)O_(4))对铜溶解速率的影响。结果表明,溶液pH值、电位和温度在溶解过程中起着关键作用。在pH 1.8、50℃和400 mV的条件下,Fe_(3)O_(4)−CuFeS_(2)混合体系中铜的回收率达到最大值(70%),而未添加Fe_(3)O_(4)时,CuFeS_(2)中铜的回收率较低(48%)。添加Fe_(3)O_(4)有助于维持较高的氧化还原值。添加Fe_(3)O_(4)还使活化能从79.04 kJ/mol降低到53.69 kJ/mol。这表明,当Fe_(3)O_(4)存在时,由于形成了更易溶解的中间体斑铜矿(Cu_(5)FeS_(4))和辉铜矿(Cu_(2)S),CuFeS_(2)更易被氧化。两种溶解过程都受到矿物表面的化学控制。此外,对浸出残渣的矿物学分析表明,当无Fe_(3)O_(4)存在时,作为表面钝化物的黄钾铁矾浓度较高。因此,添加Fe_(3)O_(4)减少了钝化层的形成,提升了铜的回收率。

关键词：黄铜矿溶解磁铁矿电偶钝化

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A comprehensive review of genetic causes of obesity

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World Journal of Pediatrics 2024年第1期20卷 26-39页

作者： Marcio Jose Concepcion-Zavaleta Juan Eduardo Quiroz-Aldave Maria del Carmen Durand-Vasquez Elman Rolando Gamarra-Osorio Juan del Carmen Valencia de la Cruz Claudia Mercedes Barrueto-Callirgos Susan Luciana Puelles-Leon Elena de Jesus Alvarado-Leon frans Leiva-Cabrera Francisca Elena Zavaleta-Gutierrez Luis Alberto Concepcion-Urteaga Jose Paz-Ibarra Universidad Cientifica del Sur Bolivar 2150 AvenuePueblo Libre15084LimaPeru Division of Medicine Hospital de Apoyo ChepénChepenPeru Division of Family Medicine Hospital de Apoyo ChepénChepenPeru Division of Endocrinology Hospital Victor Lazarte EchegarayTrujilloPeru Division of Pediatrics Hospital de Apoyo ChepenChepenPeru Division of Internal Medicine Hospital de Apoyo ChepenChepenPeru Division of Genetics Universidad Nacional de TrujilloTrujilloPeru Division of Neonatology Hospital Belen de TrujilloTrujilloPeru Division of Internal Medicine Universidad Nacional de TrujilloTrujilloPeru Department of Medicine School of MedicineUniversidad Nacional Mayor de San MarcosLimaPeru

Background Obesity is a multifactorial chronic disease with a high,increasing worldwide *** causes account for 7%of the cases in children with extreme *** sources This narrative review was conducted by searching for papers published in the PubMed/MEDLINE,Embase and SciELO databases and included 161 *** search used the following search terms:"obesity","obesity and genetics","leptin","Prader-Willi syndrome",and"melanocortins".The types of studies included were systematic reviews,clinical trials,prospective cohort studies,cross-sectional and prospective studies,narrative reviews,and case *** The leptin-melanocortin pathway is primarily responsible for the regulation of appetite and body ***,several important aspects of the pathophysiology of obesity remain *** causes of obesity can be grouped into syndromic,monogenic,and polygenic causes and should be assessed in children with extreme obesity before the age of 5 years,hyperphagia,or a family history of extreme obesity.A microarray study,an analysis of the melanocortin type 4 receptor gene mutations and leptin levels should be performed for this *** are three therapeutic levels:lifestyle modifications,pharmacological treatment,and bariatric *** Genetic study technologies are in constant development;however,we are still far from having a personalized approach to genetic causes of obesity.A significant proportion of the affected individuals are associated with genetic causes;however,there are still barriers to its approach,as it continues to be underdiagnosed.

关键词： Leptin Melanocortin Obesity Prader-Willi syndrome Precision medicine

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Fever without a source in children:international comparison of guidelines

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World Journal of Pediatrics 2023年第2期19卷 120-128页

作者： Sanne Graaf Maya Wietske Keuning Dasja Pajkrt frans Berend Plötz Department of Pediatrics Tergooi HospitalRijksstraatweg 11261 ANBlaricumThe Netherlands Department of Pediatrics Amsterdam University Medical CentersLocation Academic Medical CenterUniversity of AmsterdamAmsterdamThe Netherlands Department of Pediatric Infectious Diseases Amsterdam University Medical CentersLocation Academic Medical CenterUniversity of AmsterdamAmsterdamThe Netherlands

Background Fever without a source(FWS)in children poses a diagnostic *** distinguish a self-limiting infection from a serious infection,multiple guidelines have been developed to aid physicians in the management of ***,there is no comparison of existing FWS *** This comparative review describes consistencies and differences in guideline definitions and diagnostic and therapeutic recommendations.A literature search was performed to include secondary care FWS guidelines of high-income countries,composed by national or regional pediatric or emergency care associations,available in English or *** Ten guidelines of five high-income countries were included,with varying age ranges of children with *** children younger than one month with FWS,the majority of the guidelines recommended laboratory testing,blood and urine culturing and antibiotic treatment irrespective of the clinical condition of the *** for blood culture and antibiotic treatment varied for children aged 1–3 *** children aged above three months,urine culture recommendations were inconsistent,while all guidelines consistently recommended cerebral spinal fluid testing and antibiotic treatment exclusively for children with a high risk of serious *** We found these guidelines broadly consistent,especially for children with FWS younger than one *** variation was seen most in the targeted age ranges and in recommendations for children aged 1–3 months and above three months of *** findings of the current study can assist in harmonizing guideline development and future research for the management of children with FWS.

关键词： Children Fever Guideline

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Reducing potassium deficiency by using sodium fertilisation

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Stress Biology 2022年第1期2卷 151-160页

作者： Sarah J.Thorne frans J.M.Maathuis Department of Biology University of SheffieldSheffield S102TNUK Department of Biology University of YorkYork YO15DDUK

Potassium(K)is the most abundant cation in the vast majority of *** is required in large quantities which,in an agronomic context,typically necessitates application of K in the form of potash or other K ***,the price of K fertiliser has risen dramatically,a situation that is paralleled by increasing K deficiency of soils around the globe.A potential solution to this problem is to reduce crop K fertiliser dependency by replacing it with sodium(Na)fertiliser which carries a much smaller price *** this paper we discuss the physiological roles of K and Na and the implications of Na fertilisation for crop cultivation and soil *** using greenhouse growth assays we show distinct growth promotion after Na fertilisation in wheat,tomato,oilseed and *** results also show that up to 60%of tissue K can be substituted by Na without growth *** on these data,simple economic models suggest that(part)replacement of K fertiliser with Na fertiliser leads to considerable savings.

关键词： Deficiency Fertiliser Nutrient Potassium Salinity Sodium

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Revisiting HPV infection pattern among urban Indonesian women in general population and its implication on health burden:A cross-sectional analysis from Indonesian Noncommunicable Disease Research 2016

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Asian Pacific Journal of Tropical Medicine 2023年第12期16卷 558-564,I0014页

作者： frans Dany Kindi Adam Sarwo Handayani Holy Arif Wibowo Rita Marleta Dewi Natalie Laurencia Kipuw Khariri Widoretno Center for Biomedical Research Research Organization for HealthNational Research and Innovation AgencyJln Raya BogorKm 46Cibinong 16911West JavaIndonesia Health Policy Agency Ministry of HealthRepublic of IndonesiaJln Percetakan Negara No 23ACentral Jakarta 10560JakartaIndonesia Nottingham University NottinghamUnited Kingdom

Objective:To identify circulating HPV types among urban Indonesian women and their specific co-infection patterns in bid to curb HPV infection in the general population and minimize its ***:Urban Indonesian women from general population were selected as sample *** size and distribution across regions were determined by the Indonesian Bureau of Statistics(Badan Pusat Statistik,BPS),which represented the national *** to 35408 cervical swab specimens were collected from August to September 2016 in 34 Indonesian provinces,categorized into six regions based on the development criteria set by the Ministry of National Development Planning(Badan Perencanaan Pembangunan Nasional,BAPPENAS).From all 1874 samples identified as HPV-positive,hybrid capture was implemented to evaluate type-specific *** study analyzed descriptive data to determine the core-cluster of HPV ***-occurrence HPV network was assessed using‘qgraph’package version 1.6.3 and computed in R version ***-HPV association was analyzed in logistic regression using bias-reduction generalized linear model(brglm2)package version 0.5.1 adjusted by age and six main Indonesian ***:The logistic regression analysis demonstrated that HPV type 52 had rare relationship despite its common co-occurrence,cementing its role in single HPV *** type 16 and 18 tended to form infection cluster and were strongly associated with other ***:HPV type 52 was the most frequent HPV type among urban Indonesian women and accounted for most single infection ***,HPV 16 and HPV 18 accounted for most multiple infection cases and had strong tendency to attract other types,which may add further ***,due to lack of cytology and histological examination and information for other potential determinants,further in-depth studies are necessary to confirm whether these infection patterns truly connect to certain clinical outcomes.

关键词： Human papilloma virus HPV Infection pattern Urban women Indonesia

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Interpreting forest diversity-productivity relationships:volume values,disturbance histories and alternative inferences

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Forest Ecosystems 2020年第1期7卷 64-75页

作者： Douglas Sheil frans Bongers Faculty of Environmental Sciences and Natural Resource Management(MINA) Norwegian University of Life Sciences(NMBU)Box 50031432 AsNorway Forest Ecology and Forest Management Group Wageningen University&ResearchPO Box 476700 AA WageningenThe Netherlands

Understanding the relationship between stand-level tree diversity and productivity has the potential to inform the science and management of *** shows that plant diversity-productivity relationships are challenging to interpret—and this remains true for the study of forests using non-experimental field *** we highlight pitfalls regarding the analyses and interpretation of such *** examine three themes:1)the nature and measurement of ecological productivity and related values;2)the role of stand history and disturbance in explaining forest characteristics;and 3)the interpretation of any *** show that volume production and true productivity are distinct,and neither is a demonstrated proxy for economic *** stand characteristics,including diversity,volume growth and productivity,vary intrinsically with succession and stand *** should be characterising these relationships rather than ignoring or eliminating *** to do so may lead to misleading *** illustrate,we examine the study which prompted our concerns—Liang et al.(Science 354:aaf8957,2016)—which developed a sophisticated global analysis to infer a worldwide positive effect of biodiversity(tree species richness)on“forest productivity”(stand level wood volume production).Existing data should be able to address many of our *** evaluations will improve understanding.

关键词： Causation Correlation Diversity Inference Productivity Richness Tree-growth Wood-density

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Collaborative multi-agent reinforcement learning based on experience propagation

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Journal of Systems Engineering and Electronics 2013年第4期24卷 683-689页

作者： Min Fang frans C.A. Groen School of Computer Science and Technology Xidian University Informatics Institute University of Amsterdam

For multi-agent reinforcement learning in Markov games, knowledge extraction and sharing are key research problems. State list extracting means to calculate the optimal shared state path from state trajectories with cycles. A state list extracting algorithm checks cyclic state lists of a current state in the state trajectory, condensing the optimal action set of the current state. By reinforcing the optimal action selected, the action policy of cyclic states is optimized gradually. The state list extracting is repeatedly learned and used as the experience knowledge which is shared by teams. Agents speed up the rate of convergence by experience sharing. Competition games of preys and predators are used for the experiments. The results of experiments prove that the proposed algorithms overcome the lack of experience in the initial stage, speed up learning and improve the performance.

关键词： multi-agent Q learning state list extracting experience sharing.

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Gravitational Deflection of Particles of Light by the Earth and by the Sun: A Reconstruction of the Calculations Done by Soldner in 1801

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International Journal of Astronomy and Astrophysics 2022年第1期12卷 147-165页

作者： frans F. van Kampen The Hague The Netherlands

In 1801, the year of the discovery of Ceres, Johann Georg von Soldner calculated with classical means the gravitational deflection of a lightray grazing the surface of the Sun as 0.84”. According to General Relativity (GR) and using present-day data the deflection amounts to 1.75”. The formula for the deflection is derived with a classical method, with GR and as done by Soldner. The GR formula gives twice as large a deflection as the classical formula. It is shown that the formula of Soldner is equivalent to the classical one. Soldner’s numerical calculation of the classical deflection by the Earth comes out a factor 6.9 larger than using present-day data. This discrepancy is for a factor 6.25 due to a mistaken value for the velocity of the grazing lightray. This factor 6.25 can numerically be accounted for by assuming Soldner made a conceptual mistake related to the Axial Tilt of the Earth. The remaining discrepancy is due to the use of data less accurate than the present-day data. Soldner’s numerical calculation of the deflection by the Sun comes out correctly to the data of those days. In case of the Sun he did not give any further information regarding the data he used. A reconstruction reveals that for the surface gravity of the Sun he used a value close to the present-day value.

关键词： Johann von Soldner Gravitational Deflection of Light History of Science

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Qualifying the suitability of living donor livers for pediatric liver transplantation:are we doing the right thing?

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Hepatobiliary Surgery and Nutrition 2023年第3期12卷 462-464页

作者： Henkjan J.Verkade frans C.J.Cuperus Aad P.van den Berg Division of Pediatric Gastroenterology and Hepatology Department of PediatricsUniversity of GroningenBeatrix Children’s HospitalUniversity Medical Center GroningenGroningenThe Netherlands Department of Gastroenterology and Hepatology University of GroningenUniversity Medical Center GroningenGroningenThe Netherlands

Over the last decades,liver transplantation has become the standard care for many forms of end-stage liver disease,both in adults and in *** prognosis after pediatric liver transplantation(pLT)has steadily increased up to a patient survival at 5 years of 85%and an estimated graft half life of 31 years(1,2).In the early days of pLT,the transplanted organ originated from deceased *** 1990,adult-to-child living donor liver transplantation(LDLT)programs have developed,which rapidly gained popularity,particularly in Europe and Asia(2,3).A major stimulus for LDLT has been the limited availability of deceased *** indications for liver transplantation have expanded,particularly for adult patients,at a higher rate than the availability of donor ***,the quality of donor organs has steadily declined,resulting in a decreased utilization of livers from deceased donors for transplantation(4).The limited availability of qualified deceased donor livers has further stimulated LDLT:in Europe,for example,the percentage of living donor organs used for pLT increased from 7%before 2000 to 40%since 2010(1).

关键词： Steatosis graft survival pediatric liver transplantation(pLT) patient survival

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