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| 1 | Fluoroscopy guided percutaneous renal access in prone position显示文摘Percutaneous nephrolithotomy is a very commonly done procedure for management of renal calculus disease. Establishing a good access is the first and probably themost crucial step of this procedure. A proper access is the gateway to success. However, this crucial step has the steepest learning curve for, in a fluoroscopy guided access, it involves visualizing a three dimensional anatomy on a two dimensional fluoroscopy screen. This review describes the anatomical basis of the renal access. It provides a literature review of all aspects of percutaneous renal access along with the advances that have taken place in this field over the years. The article describes a technique to determine the site of skin puncture, the angle and depth of puncture using a simple mathematical principle. It also reviews the common problems faced during the process of puncture and dilatation and describes the ways to overcome them. The aim of this article is to provide the reader a step by step guide for percutaneous renal access. | Gyanendra R Sharma Pankaj N Maheshwari Anshu G Sharma Reeta P Maheshwari Ritwik S Heda Sakshi P Maheshwari | 2015 | World Journal of Clinical Cases2015，3，3： | 5 |
| 2 | A general framework for frequentist model averaging In Celebration of Professor Lincheng Zhao's 75th Birthday显示文摘Model selection strategies have been routinely employed to determine a model for data analysis in statistics, and further study and inference then often proceed as though the selected model were the true model that were known a priori. Model averaging approaches, on the other hand, try to combine estimators for a set of candidate models. Specifically, instead of deciding which model is the 'right' one, a model averaging approach suggests to fit a set of candidate models and average over the estimators using data adaptive weights.In this paper we establish a general frequentist model averaging framework that does not set any restrictions on the set of candidate models. It broaden, the scope of the existing methodologies under the frequentist model averaging development. Assuming the data is from an unknown model, we derive the model averaging estimator and study its limiting distributions and related predictions while taking possible modeling biases into account.We propose a set of optimal weights to combine the individual estimators so that the expected mean squared error of the average estimator is minimized. Simulation studies are conducted to compare the performance of the estimator with that of the existing methods. The results show the benefits of the proposed approach over traditional model selection approaches as well as existing model averaging methods. | Priyam Mitra Heng Lian Ritwik Mitra Hua Liang Min-ge Xie | 2019 | Science China Mathematics2019，62，2： | 3 |
| 3 | Effect of spinel content on the properties of magnesia–spinel composite refractory显示文摘 | A. Ghosh Ritwik Sarkar B. Mukherjee S.K. Das | 2003 | Journal of the European Ceramic Society2003，，7： | 2 |
| 4 | Physicochemical basis of the biologic properties of mineral trioxide aggre- gate显示文摘 | Sarkar N K Caicedo R Ritwik P | 2005 | J Endod2005，31，2： | 1 |
| 5 | Physicochemical basis of the biologic properties of mineral trioxide aggregate 显示文摘 | Sarkar NK Caicedo R Ritwik P | 2005 | J Endod2005，31，2： | 1 |
| 6 | Effect of addition of Cr2O3 on the properties of reaction sintered MgO - Al2O3 spinels 显示文摘 | Sarkar Ritwik Das Samir Kumar Banerjee Goutam | 2002 | Journal of the European Ceramic Society2002，22，8： | 1 |
| 7 | Physicochemical ba-sis of the biologic p roperties of mineral trioxide aggregate显示文摘 | Sarkar NK Caicedo R Ritwik P | 2005 | J Endod2005，31，2： | 1 |
| 8 | Integration of distributed genera- tion in the Volt/VAR management system for active distribu- tion networks 显示文摘 | B JOHANNA M RITWIK | 2015 | IEEE Transactions on Smart Grid2015，6，2： | 1 |
| 9 | Physicochemical basis of the biologie properties of mineral trioxide aggregate显示文摘 | Sarkar NK Caicedo R Ritwik P | 2005 | J Endod2005，31，2： | 1 |
| 10 | Physicochemical basis of the biologic properties of mineral trioxide aggregate 显示文摘 | Sarkar NK Caicedo R Ritwik P | 2005 | J Endod2005，31，2： | 1 |
| 11 | Physicochemical basis of the biologic properties of mineral trioxide aggregate显示文摘 | Sarkar NK Caicedo R Ritwik P | 2005 | J Endod2005，31，2： | 1 |
| 12 | Improvement of Stability and Load Sharing in an Autonomous Microgrid Using Supplementary Droop Control Loop 显示文摘 | Ritwik Majumder Balarko Chaudhuri Arindam Ghosh | 2010 | IEEE Transactions on Power Systems2010，25，2： | 1 |
| 13 | A rare complication in a case of multiple myeloma on therapy with thalidomide and dexamethasone—Reversible posterior lobe leukoencephalopathy显示文摘 | Ritwik Pandey Apurva Patel Sandip Shah Kirti M. Patel Pankaj M. Shah Shilin N. Shukla Bharat J. Parikh Asha Anand Shailesh S. Talati Harsha Panchal Sonia Parikh Sanjay Thrutthel | 2006 | Leukemia & Lymphoma2006，，7： | 1 |
| 14 | Trainable convolution filters and their application to face recogni- tion 显示文摘 | Ritwik K Arunava B Baba C V | 2012 | IEEE Transactions on Pattern Analysis and Machine Intelligence2012，34，7： | 1 |
| 15 | Low-convection-cool- ing slope cast AISi7Mg alloy: A rheological perspective显示文摘 | Ritwik R Prasada Rao A K Dhindaw B K | 2013 | Journal of Materials Engineering and Performance2013，22，9： | 1 |
| 16 | Effect of addition of Cr2O3 on the properties of reaction sintered MgOAl2O3 spinels 显示文摘 | Ritwik Sarkar Kumar Das Samir Goutam Banerjee | 2002 | Journal of the European Ceramic Society2002，22，8： | 1 |
| 17 | Improvement of stability and load sharing in autonomous microgrid using supplementary droop control loop显示文摘 | Ritwik Majumder Balarko Chaudhuri Arindam Ghosh | 2010 | IEEE Trans on Power Systems2010，25，2： | 1 |
| 18 | Risk-based approach to near miss 显示文摘 | Ritwik U | 2002 | Hydro- carbon Processing2002，，10： | 1 |
| 19 | 显示文摘 | Ritwik S Goutam B | 1999 | Journal of the European Ceramic Society1999，19，16： | 1 |
| 20 | Physicochemical basis of thebiologic properties of mineral trioxide aggregate显示文摘 | Sarkar NK Caicedo R Ritwik P | 2005 | J Endod2005，31，2： | 1 |
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