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Techno-economic feasibility assessment of a diesel exhaust heat recovery system to preheat mine intake air in remote cold climate regions

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International Journal of Mining Science and Technology 2020年第4期30卷 517-523页

作者： marco antonio Rodrigues de Brito Durjoy Baidya Seyed Ali Ghoreishi-Madiseh Norman B.Keevil Institute of Mining Engineering The University of British ColumbiaVancouverBC V6T 1Z4Canada

Underground mines in Arctic and Subarctic regions require the preheating of mine intake air during *** cold fresh air of those remote areas can be as severe as40℃ and commonly needs to be heated to around+3℃.This extensive amount of heating is usually provided by employing large-size air heaters,fueled by diesel,propane,natural gas,or heavy oil,leading to high energy costs and large carbon *** the same time,the thermal energy content of a diesel generator sets(gen-sets)exhaust is known to be one-third of the total heating value of its combusted *** heat recovery from diesel gen-sets is a growing technology that seeks to mitigate the energy costs by capturing and redirecting this commonly rejected exhaust heat to other applications such as space heating or pre-heating of the mine intake *** present study investigated the possibility of employing a simple system based on off-theshelf heat exchanger technology,which can recover the waste heat from the exhaust of the power generation units(diesel gen-sets)in an off-grid,cold,remote mine in Canada for heating of the mine intake *** from a real mine was used for the analysis along with environmental data of three different location-scenarios with distinct *** developing a thermodynamic model,the heat savings were calculated,and an economic feasibility evaluation was *** proposed system was found highly viable with annual savings of up to C$6.7 million and capable enough to provide an average of around 75%of the heating demand for mine intake air,leading to a payback period of about eleven months or less for all *** of seasonal thermal energy storage has also been recommended to mitigate the mismatch between supply and demand,mainly in summertime,possibly allowing the system to eliminate fuel costs for intake air heating.

关键词： Exhaust heat recovery Mine energy management Mine heating Alternative energy Intake air heating

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Video over IP using standard-compatible multiple description coding: an IETF proposal

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2006年第5期7卷 668-676页

作者： VITALI Andrea L BORNEO antonio FUMAGALLI marco RINALDO Roberto ST Microelectronics Strategy and System Technology Agrate Brianza (MI) 20041 Italy Center of Excellence for Research Innovation Education and Industrial Labs Partnership Milan 20133 Italy Department of Electrical Management and Mechanical Engineering University of Udine Udine 33100 Italy

Standard-compatible multiple description coding (MDC) and layered coding (LC) are efficient ways to ensure erasure resilient, scalable transmission of encoded multimedia sources via RTP, allowing a gradual degradation of the application quality with increasing packet loss rate and decreasing bandwidth/throughput on the network. In this paper we review the stan- dard-compatible framework proposed to IETF. Alternative techniques such as robust source coding and channel coding techniques (ARQ: automatic repeat request, FEC: forward error correction) are presented; their integration into the proposed framework is also discussed. The performances of MDC and LC either coupled with channel coding or not, are summarized by reference to current literature. Typical cases and examples are illustrated.

关键词： Video streaming, Robust coding, Multiple description coding, Layered coding, Loss/error resilience

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A Finite Element Study of the Influence of Graphite Nodule Characteristics on a Subsurface Crack in a Ductile Cast Iron Matrix under a Contact Load

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Computer Modeling in Engineering & Sciences 2018年第10期117卷 59-71页

作者： Guilherme Suguinoshita Carlos Henrique da Silva marco antonio Luersen Department of Mechanical Engineering Federal University of Technology-Parana(UTFPR)Rua Deputado Heitor Alencar Furtado5000CEP 81280-340CuritibaBrazil

This paper describes a study of the effects of graphite nodule characteristics on a subsurface crack in austempered ductile iron(ADI).A representative specimen of ADI,subjected to sliding contact load,is modeled using finite elements aiming to obtain the shear stress intensity factor(KII).The parameters varied were(i)the nodule diameter(two different values were considered),(ii)the distance between the nodule and the tip of the crack and(iii)the position of the load relative to the tip of the *** results of the numerical simulations show that the smaller diameter nodule has a larger influence on KII,suggesting a higher contact fatigue crack propagation rate in the material with the smaller *** results are the opposite of those observed in experimental studies and would appear to indicate that other factors should be also considered to ensure realistic estimates of the contact fatigue strength of ADI.

关键词： Austempered ductile iron subsurface crack stress intensity factor finite element analysis graphite nodule

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Branched chain amino acids in hepatic encephalopathy and sarcopenia in liver cirrhosis:Evidence and uncertainties

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World Journal of Gastroenterology 2023年第19期29卷 2905-2915页

作者： Giuseppe Marrone Amato Serra Luca Miele marco Biolato antonio Liguori antonio Grieco antonio Gasbarrini Medical and Surgical Sciences Fondazione Policlinico Universitario A.Gemelli-IRCCSUniversita Cattolica del Sacro CuoreRome 00168Italy

Liver cirrhosis is commonly associated with nutritional alterations,reported in 20% of patients with compensated disease and over 60% of patients with decompensated *** disturbances are associated with a worse prognosis and increased risk of *** levels of branched-chain amino acids(BCAAs)are decreased in patients with liver *** imbalance of amino acids levels has been suggested to be associated with the development of complications,such as hepatic encephalopathy and sarcopenia,and to affect the clinical presentation and prognosis of these *** studies investigated the efficacy of BCAAs supplementation as a therapeutic option in liver cirrhosis,but uncertainties remain about the real efficacy,the best route of administration,and dosage.

关键词： Branched-chain amino acids Hepatic encephalopathy Sarcopenia Liver cirrhosis

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Are the cerrado and the seasonal forest woody floras assembled by different processes despite their spatial proximity?

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Journal of Plant Ecology 2018年第5期11卷 740-750页

作者： Raquel Carolina Miatto marco antonio Batalha Department of Botany Federal University of São CarlosPO Box 67613565-905São CarlosBrazil Department of Biology University of São Paulo14040-901Ribeirão PretoBrazil

Aims The Brazilian cerrado occupies land that could be occupied by seasonal forest,given current climatic conditions and their spatial *** has been identified as one of the main determinants of cerrado and forest *** tested whether cerrado and seasonal forest woody floras were assembled by different *** postulated that soil nutrient availability would account for dif-ferences in the functional and phylogenetic structure of the cerrado and the seasonal *** In 1005×5 m plots distributed along cerrado and seasonal forest patches in south-eastern Brazil,we sampled five individuals with a basal diameter≥3 cm from 127 species and measured seven of their functional traits(plant height,basal area,tortuosity,leaf size,specific leaf area,leaf dry matter content,and leaf toughness).We constructed a phylogenetic tree and calculated the pairwise mean functional-phy-logenetic distances(MFPDs),an approach that accounts for functional and phylogenetic information both separately and *** also sampled soils to a depth of 5 cm in each plot and had their chem-ical and physical properties *** related the MFPD to soil properties and compared MFPD between cerrado and forest *** Findings Phylogenetic distances were higher than functional distances in both cerrado and seasonal forest communities,suggesting trait convergence in both *** of the importance given to functional or phylogenetic information,most of the com-munities in the cerrado and in the seasonal forest fell within the null expectation,implying either that multiple assembly processes can occur simultaneously along the gradient of soil fertility,or that not all important traits were *** was related to soil nutrient status when only functional distances were *** this case,MFPD was lower in the cerrado than in the forest,indi-cating that soil nutrient availability influenced plant traits,with the low-nutrient soils in

关键词： competition functional traits environmental filter nutrient limitation phylogeny savanna

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Tumor necrosis factor-α inhibitors and chronic hepatitis C:A comprehensive literature review

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World Journal of Gastroenterology 2013年第44期19卷 7867-7873页

作者： Maurizio Pompili marco Biolato Luca Miele antonio Grieco Department of Internal Medicine Università Cattolica del Sacro Cuore 8-00168 Roma Italy

Tumor necrosis factor-α(TNF-α)inhibitors are known to increase reactivation of concurrent chronic hepatitis B,but their impact on the hepatitis C virus(HCV)is *** conditions of immunosuppression,such as liver transplantation,typically cause an increase in the rate of HCV *** of TNF-α,a cytokine involved in the apoptotic signaling pathway of hepatocytes infected by HCV,could potentially increase viral *** available clinical data appear to contradict this hypothesis.A review of medical literature revealed that a total of 216 patients with HCV were exposed to one or more treatments with TNF-αinhibitors,with a median observation time of 1.2 years and 260 cumulative patient-years of *** three cases of drug withdrawal due to suspected HCV liver disease recrudescence were *** with TNF-αinhibitors in patients with HCV infection appears to be safe in the short term,but there are insufficient data to assess their long-term *** screening for HCV before beginning treatment with TNF-αinhibitors is currently *** presence of HCV is not a contraindication to therapy with TNF-αinhibitors,with the exception of cirrhotic *** cases of cirrhosis,the benefit/risk ratio should be evaluated at the individual *** to treatment with TNF-αinhibitors,patients with HCV should be referred to a hepatologist to determine the necessity of hepatic disease assessment,using liver biopsy or noninvasive methods,and the potential indication for antiviral *** patients with HCV infection who are treated with TNF-αinhibitors,liver function monitoring every three months is advised.

关键词： Infliximab Etanercept Adalimumab Hepatitis C virus Rheumatoid arthritis Inflammatory bowel disease Psoriasis

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Spatial heterogeneity of factors influencing forest fires size in northern Mexico

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Journal of Forestry Research 2014年第2期25卷 291-300页

作者： Gustavo Perez-Verdin marco antonio Marquez-Linares Maricela Salmeron-Macias Instituto Politecnico Nacional CIIDIR–DGODurangoDgoMexico34220

In Mexico, forest fires are strongly influenced by environmental, topographic, and anthropogenic factors. A government-based database covering the period 2000-2011 was used to analyze the spatial heterogeneity of the factors influencing forest fire size in the state of Durango, Mexico. Ordinary least squares and geographically weighted regression models were fit to identify the main factors as well as their spatial influence on fire size. Results indicate that fire size is greatly affected by distance to roads, distance to towns, precipitation, temperature, and a population gravity index. The geographically weighted model was better than the ordinary least squares model. The improvement of the former is due to the influence of factors that were found to be non-stationary. These results suggest that geographic location determines the influence of a factor on fire size. While the models can be greatly improved with additional information, the study suggests the need to adopt fire management policies to more efficiently reduce the effect of anthropogenic factors. These policies may include more training for landowners who use fire for clearing, closure of roads, application of thinning, prescribed burning, and fire breaks in perimeters adjacent to roads.

关键词： Durango Mexico geographically weighted regression ordinary least squares stationarity

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Minimum platelet count threshold before invasive procedures in cirrhosis:Evolution of the guidelines

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World Journal of Gastrointestinal Surgery 2023年第2期15卷 127-141页

作者： marco Biolato Federica Vitale Tiziano Galasso antonio Gasbarrini antonio Grieco Department of Medical and Surgical Sciences CEMADFondazione Policlinico Universitario Agostino Gemelli IRCCSRome 00168Italy Department of Internal Medicine Catholic University of Sacred HeartRome 00168Italy

Cirrhotic patients with severe thrombocytopenia are at increased risk of bleeding during invasive *** need for preprocedural prophylaxis aimed at reducing the risk of bleeding in cirrhotic patients with thrombocytopenia who undergo scheduled procedures is assessed via the platelet count;however,establishing a minimum threshold considered safe is challenging.A platelet count≥50000/μL is a frequent target,but levels vary by provider,procedure,and specific *** the years,this value has changed several times according to the different guidelines proposed in the *** to the latest guidelines,many procedures can be performed at any level of platelet count,which should not necessarily be checked before the *** this review,we aim to investigate and describe how the guidelines have evolved in recent years in the evaluation of the minimum platelet count threshold required to perform different invasive procedures,according to their bleeding risk.

关键词： Liver disease Thrombocytopenia Avatrombopag Lusutrombopag Transfusion

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Diesel generator exhaust heat recovery fully-coupled with intake air heating for off-grid mining operations:An experimental,numerical,and analytical evaluation

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International Journal of Mining Science and Technology 2022年第1期32卷 155-169页

作者： Durjoy Baidya marco antonio Rodrigues de Brito Agus PSasmito Seyed Ali Ghoreishi-Madiseh Norman B.Keevil Institute of Mining Engineering The University of British ColumbiaVancouver V6T 1Z4Canada Department of Mining and Materials Engineering McGill UniversityMontreal H3A 2A7Canada

The customarily discarded exhaust from the fossil fuel-based power plants of the off-grid mines holds the thermal potential to fulfill the heating requirement of the underground *** present research fills in an important research gap by investigating the coupling effect between a diesel exhaust heat recovery and an intake air heating system employed in a remote *** integrative approach comprising analytical,numerical,and experimental assessment has been *** novel analytical model developed here establishes the reliability of the proposed mine heating system by providing comparative analysis between a coupled and a decoupled *** effect of working fluid variation has been examined by the numerical analysis and the possible improvement has been *** investigations present a demonstration of the successful lab-scale implementation of the concept and validate the numerical and analytical models *** deployment of the fully coupled mine heating system proposed here will assist the mining industry on its journey towards energy-efficient,and sustainable mining practices through nearly 70%reduction in fossil fuel consumption for heating intentions.

关键词： Remote mines Waste heat utilization Diesel exhaust Combined heat and power generation Clean energy in mining Coupled heating system

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How the “seed” prepares the “soil”: the bone/bone marrow pre-metastatic niche

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Journal of Cancer Metastasis and Treatment 2021年第1期7卷 478-496页

作者： antonio Maurizi marco Ponzetti Nadia Rucci Department of Biotechnological and Applied Clinical Sciences University of L’AquilaL’Aquila 67100Italy.

Cancer is one of the leading causes of death in women and men *** fatal outcome usually occurs after metastatic dissemination,and bone is by far the most common site of metastasis for breast and prostate cancer,the highest incidence neoplasia in women and men,***,while this is clear,the mechanisms through which the metastatic preference is established is *** emerging concept in this regard is the pre-metastatic niche(PMN)establishment,i.e.,the process through which tumors can influence the bone microenvironment from the primary site and make it permissive for their engraftment,before they migrate to the blood flow and *** this review,we discuss key microenvironmental players in the bone/bone marrow PMN,including osteoblasts,osteoclasts,and bone marrow *** also describe the known PMN-educating factors,as well as the role of extracellular vesicles as emerging players in the bone/bone marrow *** overview of current therapeutic developments aimed at targeting the bone PMN is also provided.

关键词： Bone metastasis pre-metastatic niche bone microenvironment extracellular vesicles

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