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排序方式: 共有189条查询结果,搜索用时 31 毫秒
81.
82.
83.
Athanas M Brower W Masek G Paar HP Gronberg J Kutschke R Menary S Morrison RJ Nakanishi S Nelson HN Nelson TK Qiao C Richman JD Ryd A Tajima H Sperka D Witherell MS Balest R Cho K Ford WT Johnson DR Lingel K Lohner M Rankin P Smith JG Alexander JP Bebek C Berkelman K Bloom K Browder TE Cassel DG Cho HA Coffman DM Crowcroft DS Drell PS Dumas D Ehrlich R Gaidarev P Garcia-Sciveres M Geiser B Gittelman B Gray SW Hartill DL Heltsley BK Henderson S Jones CD Jones SL Kandaswamy J Katayama N Kim PC 《Physical review letters》1994,73(26):3503-3507
84.
Balest R Cho K Ford T Johnson DR Lingel K Lohner M Rankin P Smith JG Alexander JP Bebek C Berkelman K Bloom K Browder TE Cassel DG Cho HA Coffman DM Crowcroft DS Drell PS Dumas D Ehrlich R Gaidarev P Galik RS Garcia-Sciveres M Geiser B Gittelman B Gray SW Hartill DL Heltsley BK Henderson S Jones CD Jones SL Kandaswamy J Katayama N Kim PC Kreinick DL Ludwig GS Masui J Mevissen J Mistry NB Ng CR Nordberg E Patterson JR Peterson D Riley D Salman S Sapper M Würthwein F Urish MM Avery P Freyberger A 《Physical review D: Particles and fields》1995,51(5):2053-2060
85.
Balest R Cho K Ford WT Johnson DR Lingel K Lohner M Rankin P Smith JG Alexander JP Bebek C Berkelman K Bloom K Browder TE Cassel DG Cho HA Coffman DM Crowcroft DS Drell PS Dumas DJ Ehrlich R Gaidarev P Garcia-Sciveres M Geiser B Gittelman B Gray SW Hartill DL Heltsley BK Henderson S Jones CD Jones SL Kandaswamy J Katayama N Kim PC Kreinick DL Ludwig GS Masui J Mevissen J Mistry NB Ng CR Nordberg E Patterson JR Peterson D Riley D Salman S Sapper M Würthwein F Avery P Freyberger A Rodriguez J 《Physical review D: Particles and fields》1995,52(5):2661-2672
86.
Gronberg J Korte CM Kutschke R Menary S Morrison RJ Nakanishi S Nelson HN Nelson TK Qiao C Richman JD Roberts D Ryd A Tajima H Witherell MS Balest R Cho K Ford WT Lohner M Park H Rankin P Smith JG Alexander JP Bebek C Berger BE Berkelman K Bloom K Browder TE Cassel DG Cho HA Coffman DM Crowcroft DS Dickson M Drell PS Dumas DJ Ehrlich R Elia R Gaidarev P Garcia-Sciveres M Gittelman B Gray SW Hartill DL Heltsley BK Henderson S Jones CD Jones SL Kandaswamy J Katayama N Kim PC Kreinick DL Lee T 《Physical review letters》1995,75(18):3232-3236
87.
Alexander JP Bebek C Berger BE Berkelman K Bloom K Cassel DG Cho HA Coffman DM Crowcroft DS Dickson M Drell PS Dumas DJ Ehrlich R Elia R Gaidarev P Gittelman B Gray SW Hartill DL Heltsley BK Jones CD Jones SL Kandaswamy J Katayama N Kim PC Kreinick DL Lee T Liu Y Ludwig GS Masui J Mevissen J Mistry NB Ng CR Nordberg E Patterson JR Peterson D Riley D Soffer A Ward C Avery P Prescott C Yang S Yelton J Brandenburg G Briere RA Liu T Saulnier M Wilson R Yamamoto H Browder TE Li F Rodriguez JL 《Physical review letters》1996,77(25):5000-5004
88.
B. E. Burpitt L. P. Crawford B. J. Davies J. Mistry M. B. Mitchell K. D. Pancholi W. J. Coates 《Journal of heterocyclic chemistry》1988,25(6):1689-1695
Two synthetic routes to the dihydropyridazinone-cyanoguanidine 4 (SK&F 94836) are described, both proceeding via the anilino compound 6. An efficient synthesis of the dihydropyridazinone-pyridone 5 (SK&F 95654) is reported. This synthesis proceeds via the fluoro-keto-acid 24 , with subsequent displacement of the fluoro substituent by 4-pyridone. The surprising effectiveness of water as a solvent in this reaction has been highlighted. 相似文献
89.
A mixture of manganese dioxide and hydrochloric acid has been used for the accurate and precise determination of gold in
various gold-bearing matrices. Results of intermethod comparison studies, F-test on variances, Mann-Whitney U-test, Spearman
rank correlation and regression analyses are presented. The recommended method can be applied to a quality control programme
and for the evaluation of reference materials. Various standard reference materials (SRM) of diverse matrices have been examined
to check the validity of the method and the results were found to be in very good agreement with the certified data. Sample
decomposition is straight forward [1–10 g sample (roasted at 600–700 °C)+5 g of MnO2+30 mL of 2 mol/L HCl]. Gold is coprecipitated with potassium tellurite using tin (II) chloride solution. The precipitate
is extracted into toluene and finally stripped back into aqua-regia solution for final nebulization into an air-acetylene
flame for atomic absorption spectrophotometry. The method is very simple and easily adaptable, and more convenient than conventional
methods involving aqua regia or a hydrobromic acid-bromine water mixture.
Received: 23 October 1995/Revised: 18 March 1996/Accepted: 23 March 1996 相似文献
90.
Ultrasonic irradiation has been found to accelerate the solvolysis of 2-chloro-2-methylpropane in aqueous ethanol mixtures from 20 to 60% w/w in ethanol at temperatures between 10° and 25°. The effects are more marked at lower temperatures and higher alcohol compositions with a 20 fold rate acceleration occurring at 10° and 60% w/w. The results also lend independent support to two previous observations that (a) the position of maximum in solvent structuredness is 50% w/w and (b) a logarithmic relationship exists between solvent vapour pressure and ultrasonically enhanced rate constant. At solvent compositions of 50 and 60% w/w ethanol the absolute rate of reaction under irradiation increases with decreasing reaction temperature below 20°. 相似文献