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| 1 | A discrete model for prediction of radon flux from fractured rocks显示文摘Prediction of radon flux from the fractured zone of a propagating cave mine is basically associated with uncertainty and complexity. For instance, there is restricted access to these zones for field measurements, and it is quite difficult to replicate the complex nature of both natural and induced fractures in these zones in laboratory studies. Hence, a technique for predicting radon flux from a fractured rock using a discrete fracture network(DFN) model is developed to address these difficulties. This model quantifies the contribution of fractures to the total radon flux, and estimates the fracture density from a measured radon flux considering the effects of advection, diffusion, as well as radon generation and decay. Radon generation and decay are classified as reaction processes. Therefore, the equation solved is termed as the advection-diffusion-reaction equation(ADRE). Peclet number(Pe), a conventional dimensionless parameter that indicates the ratio of mass transport by advection to diffusion, is used to classify the transport regimes. The results show that the proposed model effectively predicts radon flux from a fractured rock. An increase in fracture density for a rock sample with uniformly distributed radon generation rate can elevate radon flux significantly compared with another rock sample with an equivalent increase in radon generation rate. In addition to Pe, two other independent dimensionless parameters(derived for radon transport through fractures) significantly affect radon dimensionless flux.Findings provide insight into radon transport through fractured rocks and can be used to improve radon control measures for proactive mitigation. | K.M. Ajayi K. Shahbazi R Tukkaraja K. Katzenstein | 2018 | Journal of Rock Mechanics and Geotechnical Engineering2018，10，5： | 4 |
| 2 | Numerical investigation of the effectiveness of radon control measures in cave mines显示文摘Ventilation is one of the radon control measures in an underground working environment.However,the dynamics related to the cave mining methods particularly in block/panel cave mines,complicate the design of effective ventilation system,and implementation.Events such as hang ups(in the drawbells),leakage from old workings,and changes in cave porosity lead to differing response of an existing ventilation designs.However,it is difficult to investigate these conditions at the mine or with a laboratory scale study.Therefore,this study develops a discrete model to investigate the impact of different radon control measures in cave mines using computational fluid dynamics techniques.We considered two ventilation conditions for a fully developed cave:with and without the undercut ventilation.For each of the two conditions,we studied four parameters:airflow distribution through the production drifts,radon distribution through the production drifts,the effect of increasing airflow on radon concentration,and the effect of a cave top negative pressure on radon distribution.The results show that:the undercut ventilation significantly increases the radon concentration in the production drift;the growth of radon concentration through the production drift is nonlinear(oscillating pattern);maintaining a negative pressure on top of the cave is more effective at mitigating radon exposure,when the undercut ventilation is active;and increase in air volume flow rate decreases radon concentration in most regions,however,there might be regions with significant radon accumulation due to pressure variation across the drifts.These findings provide vital information for designing an effective ventilation system and for proactive implementation of radon control measures in cave mines. | Kayode Ajayi Khosro Shahbazi Purushotham Tukkaraja Kurt Katzenstein | 2019 | International Journal of Mining Science and Technology2019，29，3： | 3 |
| 3 | Prediction of airway resistance in panel cave mines using a discrete and continuum model显示文摘The configuration of an airway(or production drift)in panel cave mines is different from the typical(straight)mine airway designs.The drawpoints are connected to the airway(cross-cuts),which allows airflow from the cave into the airway or air loss from the airway into the cave due to the ventilation approach and cave porosity.These affect airflow in the production drifts,but it is difficult to investigate these conditions from field or laboratory scaled studies.Therefore,this study develops discrete and continuum computational fluid dynamics(CFD)models to study the effects of the ventilation approach and cave porosity on the airway resistance.Our findings show that:with active undercut ventilation,a unique resistance model is required for the airway in panel cave mines;and an increase in cave porosity decreases the drift’s resistance.These findings provide essential tools for a panel cave ventilation design. | Kayode M.Ajayi Khosro Shahbazi Purushotham Tukkaraja Kurt Katzenstein | 2019 | International Journal of Mining Science and Technology2019，29，5： | 2 |
| 4 | Idiopathic pulmonary fibrosis: clinical relevance and pathologic classification 显示文摘 | KATZENSTEIN ALA MYERS JL | 1998 | Am J Respir Crit Care Med1998，157，41： | 1 |
| 5 | Idiopathic pulmonary fibrosis:clinical relevance of pathologic classification显示文摘 | Katzenstein ALA Myers J L | 1998 | Am J Respir Crit Care Med1998，157，41： | 1 |
| 6 | Idiopathic pulmonary fibrosis: clinicalrelerace of pathologic classification显示文摘 | Katzenstein A L Myers J L | 1998 | Am J Respire Crit1998，157，4： | 1 |
| 7 | Idiopathic pulmonary fibrosis ,clinical relevance of pathologic classification 显示文摘 | Katzenstein AL Myers JL | 1998 | Am J Respir Crit Care Med1998，157，41： | 1 |
| 8 | Comparison of FISH, PCR, and immunohistochemistry in assessing EGFR status in lung adenocarcinoma and corre- lation with clinicopathologic features 显示文摘 | EL-ZAMMAR O A ZHANG S KATZENSTEIN A L | 2009 | Diagn Mol Pathol2009，18，3： | 1 |
| 9 | So- called scerosing hemangioma of the lung, evidence for mesothelial origin 显示文摘 | Katzenstein AL Weise DL Fulling K | 1983 | Am JSurgPathol1983，7，： | 1 |
| 10 | Nonspecific interstitial pneumonia/fibrosis:Histologic feature and clinical significance显示文摘 | Katzenstein ALA Fiorelli RF | | 0，，02： | 1 |
| 11 | Competence-driven project portfolio selection, scheduling and staff assignment显示文摘 | Walter J. Gutjahr Stefan Katzensteiner Peter Reiter Christian Stummer Michaela Denk | 2008 | Central European Journal of Operations Research2008，，3： | 1 |
| 12 | Unusual presentation of congenital infantile fibrosarcoma in seven infants with molecular-genetic analysis 显示文摘 | SteelmanC Katzenstein H Parham D | 2011 | Fetal Pediatr Pathol2011，30，5： | 1 |
| 13 | Antiangiogenic therapy inhibits human neuroblastoma growth显示文摘 | Katzenstein HM Salwen HR Nguyen NN | 2001 | Med Pediatr Oncol2001，36，1： | 1 |
| 14 | Laser light scattering in laboratory plasmas显示文摘 | Evans D E Katzenstein J | 1969 | Rep Prog Phys1969，32，： | 1 |
| 15 | Lymphomatoid granulomatosis:evidence of immunophenotypic diversity and relationship to Epstein-Barr virus infection显示文摘 | Myers JL Kurlin PJ Katzenstein AL | 1995 | Am J Surg Pathol1995，19，11： | 1 |
| 16 | Idiopathic pulmonary fibrosis, clinical relevance of pathologic classification显示文摘 | Katzenstein AA | 1998 | Am J Respir Crit Care Med1998，157，： | 1 |
| 17 | Idiopathic pulmonary fibrosis:clinical relevance and pathologic classification显示文摘 | Katzenstein ALA Myers JL | | 0，，01： | 1 |
| 18 | Unusual presentation of Rosai-Dorfman disease(RDD)in the bone in adolescents显示文摘 | Shulman S Katzenstein H Abramowsky C | 2011 | Fetal Pediatr Pathol2011，30，6： | 1 |
| 19 | Undifferentiated embryonal sarcoma of the liver is associated with mesenchymal hamartoma and multiple chromosomal abnormalities: a review of eleven cases 显示文摘 | Shehata BM Gupta NA Katzenstein HM | 2011 | Pediatr Dev Pathol2011，14，2： | 1 |
| 20 | Undifferentiated embryonal sarcoma of the liver is associated with mesenchymal hamartoma and multiple chromosomal abnormalities: a review of eleven cases显示文摘 | Shehata BM Gupta NA Katzenstein HM | 2011 | Pediatr Dev Pathol2011，14，2： | 1 |
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