نتایج جستجو برای: chiral auxiliaries

تعداد نتایج: 38094  

Journal: :Journal of Raman Spectroscopy 2023

Abstract Coherent anti‐Stokes Raman scattering‐Raman optical activity (CARS‐ROA) is a coherent version of spontaneous ROA spectroscopy, the latter being well‐established chirally sensitive vibrational spectroscopic technique. A central major advantage heterodyne‐detected CARS‐ROA over drastic reduction acquisition times from several hours to approximately 1 min due high ratio chiral signal rela...

Journal: :Journal of clinical orthodontics : JCO 2010
Ken Fischer

I nvisalign* treatment of dental Class II malocclusions in adolescents and young adults is not commonly attempted, even by orthodontists who have significant experience with aligners. Furthermore, the need for auxiliaries such as Class II correctors or elastics makes the technique less appealing to many clinicians. As this article shows, however, there are other successful ways to treat Class I...

2002
Phillip S. Kott

This paper focuses on a design-consistent regression estimator in which the “auxiliaries” are estimated from a stratified cluster sample and the regression coefficients from an arbitrary subsample of the original sample. The reweighted expansion estimator described in Stukel and Kott (1997) is an example of such an estimator. Assuming that the target variable is a linear function of the auxilia...

Journal: :Handelingen 2021

This study about the productivity and near-synonymy of inchoative construction in Peninsular Spanish reveals that at least 25 verbs can enter auxiliary slot. These auxiliaries are recruited from six semantic domains: (1) superlexical inherent verbs, (2) put (3) throw (4) movement (5) manual manipulation (6) destruction. confirms a hierarchical cluster analysis is suited to investigate semantica...

A common approach in resolving enantiomers of chiral basic drugs by capillary electrophoresis (CE) is to use cyclodextrins (especially their anionic derivatives) as chiral selector in the acidic buffer (pH ≤ 3) in normal or reversed (carrier) mode. Then, some organic modifiers are added to the buffer solution if the resolution is not satisfactory. In case of cetirizine (CTN), applying the same ...

In the present paper, the expressions for scalar and vector potentials in lossless isotropic chiral media are analyzed. Propagating eigenvalues of these potentials are then obtained. Furthermore by decomposition of sources and fields in a chiral medium, we introduce the auxiliary right-and left-handed potentials and find the associated fields. These potentials are used to solve the problem of a...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه شهید بهشتی - دانشکده علوم 1377

در این پایان نامه با هدف نهایی تعیین بار فرمیونی سالیتونها، جفت شدگی میدانهای فرمیونی و سالیتونی در نظر گرفته شده است . در فصل اول مفاهیم سالیتون و امواج سالیتاری مورد بررسی قرار گرفته، و در این راستا چنین امواجی با مثالهایی در 1+1 و 1+2 بعد توصیف گردیده اند. در فصل دوم قطبیده شدن خلاء فرمیون (vacuum polarization: vp) در حضور میدان سالیتونی مورد بررسی قرار گرفته. در این زمینه در سال 1994 گوشه و...

A common approach in resolving enantiomers of chiral basic drugs by capillary electrophoresis (CE) is to use cyclodextrins (especially their anionic derivatives) as chiral selector in the acidic buffer (pH ≤ 3) in normal or reversed (carrier) mode. Then, some organic modifiers are added to the buffer solution if the resolution is not satisfactory. In case of cetirizine (CTN), applying the same ...

1999
Anna Kupść

The aim of this paper is to compare the behaviour of Polish and Romance pronominal clitics in tense auxiliary constructions and to account for Polish facts. First, we present the system of Polish auxiliaries, briefly comparing it to Romance. Then, we discuss clitic climbing (CC), the phenomenon well-known in Romance. We contrast Polish CC with CC in Italian and French. Finally, we present a for...

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