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| 1 | Multi-objective optimization of oil well drilling using elitist non-dominated sorting genetic algorithm显示文摘A multi-objective optimization of oil well drilling has been carried out using a binary coded elitist non-dominated sorting genetic algorithm. A Louisiana offshore field with abnormal formation pressure is considered for optimization. Several multi-objective optimization problems involving two-and three-objective functions were formulated and solved to fix optimal drilling variables. The important objectives are:(i) maximizing drilling depth,(ii) minimizing drilling time and(iii) minimizing drilling cost with fractional drill bit tooth wear as a constraint. Important time dependent decision variables are:(i) equivalent circulation mud density,(ii) drill bit rotation,(iii) weight on bit and(iv) Reynolds number function of circulating mud through drill bit nozzles. A set of non-dominated optimal Pareto frontier is obtained for the two-objective optimization problem whereas a non-dominated optimal Pareto surface is obtained for the three-objective optimization problem. Depending on the trade-offs involved, decision makers may select any point from the optimal Pareto frontier or optimal Pareto surface and hence corresponding values of the decision variables that may be selected for optimal drilling operation. For minimizing drilling time and drilling cost, the optimum values of the decision variables are needed to be kept at the higher values whereas the optimum values of decision variables are at the lower values for the maximization of drilling depth. | Chandan Guria Kiran K Goli Akhilendra K Pathak | 2014 | Petroleum Science2014，11，1： | 10 |
| 2 | Photochemical smog in China:scientific challenges and implications for air-quality policies显示文摘INTRODUCTION Severe air-pollution events in many parts of China pose a major threat to health and ecosystems[1].China’s air pollution is concentrated to economically developed areas,such as Beijing–Tianjin–Hebei(BTH)and Pearl–River–Delta(PRD)[2,3].The situation has received considerable attention in | Mattias Hallquist John Munthe Min Hu Tao Wang Chak K Chan Jian Gao Johan Boman Song Guo Asa M Hallquist Johan Mellqvist Jana Moldanova Ravi K Pathak Jan BC Pettersson Hakan Pleijel David Simpson Marie Thynell | 2016 | National Science Review2016，3，4： | 8 |
| 3 | Human sperm immobilization effect of Carica papaya seed extracts: an in vitro study显示文摘Aim: To examine if the seed extracts of Carica papaya, which showed antispermatogenic/sperm immobilization properties in animal models, could cause human sperm immobilization in vitro. Methods: Chloroform extract, benzene chromatographic fraction of the chloroform extract, its methanol and ethyl acetate sub-fractions and the isolated compounds from the sub-fractions i.e., ECP 1 & 2 and MCP 1 & 2, of the seeds of Cadca papaya were used at concentrations of 0.1%, 0.5%, 1% and 2%. Sperm motility was assessed immediately after addition of extracts and every 5 minutes thereafter for 30 minutes. Results: There were dose-dependent spermicidal effects showing an instant fall in the sperm motility to less than 20 % at 2 % concentration. Isolated compounds ECP 1 & 2 were more effective inducing a motility of less than 10%. Many of the spermatozoa became vibratory on the spot. Total inhibition of motility was observed within 20 - 25 min at all concentrations of all products. Scanning and transmission electron microscopy revealed deleterious changes in the plasma membrane of the head and mid-piece of spermatozoa. Sperm viability test and the number of abnormal spermatozoa after completion of incubation suggested that the spermatozoa were infertile. The effects were spermicidal but not spermiostatic as revealed by the sperm revival test. Conclusion: The results reveal spermicidal activity in vitro of the seed extracts of Carica papaya. | Nirmal K Lohiya Lalit K Kothari B Manivannan Pradyumna K Mishra Neelam Pathak | 2000 | Asian Journal of Andrology2000，2，2： | 6 |
| 4 | Fixed point theorems for weak compatible multi-valued and single-valued mapping显示文摘 | | 1995 | Acta Math Hungar1995，67，12： | 1 |
| 5 | Acupressure wrist bands do not prevent postoperative nausea and vomiting after urological endoscopic surgery显示文摘 | Agarwal A Pathak K Gaur A | 2000 | Can J Anaesth2000，47，4： | 1 |
| 6 | Genetic parameters correlation and selection response for submergence tolerance in rice 显示文摘 | PATHAK P K BORI-I P SHARMA K K | 1998 | Acta Agriculture Universities Henanensis1998，32，3： | 1 |
| 7 | Utilizing guar gum for development of 'tabs in cap' system of losartan potassium for chronotherapeutics 显示文摘 | Gangwar G Kumar A Pathak K | 2015 | Int J Biol Macromol2015，72，： | 1 |
| 8 | Friction and wear properties of bushing bearing of graphite filled short glass composites in dry sliding 显示文摘 | Sravastava V K Pathak J P | 1996 | Wear1996，197，： | 1 |
| 9 | Engine quality producer gas from leucaena leueocephala and selected agricultural residues 显示文摘 | PATHAK B S JAIN A K | 2004 | Journal of Agril Engineering2004，21，3： | 1 |
| 10 | Dicyclohexano-18-Crown-6 in Butanol-Octanol Mixture: A Promising Extractant of Sr( Ⅱ ) From Nitric Acid Medium显示文摘 | Amar K Mohapatra P K Pathak P N | 1997 | Talanta1997，45，： | 1 |
| 11 | Thermal and viscoelastic proper- ties of sequentially polymerized networks composed of benzoxazine,epoxy,and phenalkamine curing agents显示文摘 | RAO B S PATHAK S K | 2006 | J Appl Polym Sci2006，100，5： | 1 |
| 12 | Molecular characterization of a membrane transporter for lactate, pyruvate, and other monocarboxylates: implications for the Cori cycle显示文摘 | GARCIA C K GOLDSTEIN J L PATHAK R K | 1994 | Cell1994，76，： | 1 |
| 13 | A comparative study on parthenogenetic activation and embryo production from in vitro matured caprine oocytes显示文摘 | Pathak J Kharche S D Goel A K | 2013 | Small Ruminant Research2013，113，： | 1 |
| 14 | Empirical modeling of chemoviscosity of hydroxy terminated polybutadiene based solid composite propellant slurry显示文摘 | Mahanta Abhay K Goyal Monika Pathak Devendra D | 2010 | Malaysian Polymer Journal2010，5，1： | 1 |
| 15 | Efficiency of fertilizer ni- trogen in cereal production: retrospects and prospects显示文摘 | Ladlm J K Pathak H Krupnlk T | 2005 | Advances in Agronomy2005，87，： | 1 |
| 16 | Structural effect of phenalkami- nes on adhesive viscoelastic and thermal properties of epoxy networks显示文摘 | PATHAK S K RAO B S | 2006 | J Appl Polym Sci2006，102，5： | 1 |
| 17 | Efficiency of fertilizer nitro- gen in cereal production retrospect and prospects显示文摘 | Ladha J K Pathak H Krupnik T J | 2005 | Advances and Agronomy2005，87，： | 1 |
| 18 | Assessment of LIBS forSpectrochemical An- alysis:A Review显示文摘 | Pathak A K | 2011 | AppliedSpectroscopy Reviews2011，47，1： | 1 |
| 19 | Constituents of the aerial parts of Rumex nepalensis Spreng 显示文摘 | Khetwal K S Manral K Pathak R P | 1987 | lndian Drugs1987，24，7： | 1 |
| 20 | Efficiency of fertilizer nitrogen in cereal production:Retrospects and Prospects显示文摘 | Ladha J K Pathak H Krupnik T J | 2005 | Advances in Agronomy2005，87，： | 1 |
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