62,413 research outputs found
Off-shell Bethe vectors and Drinfeld currents
In this paper we compare two constructions of weight functions (off-shell
Bethe vectors) for the quantum affine algebra . The
first construction comes from the algebraic nested Bethe ansatz. The second one
is defined in terms of certain projections of products of Drinfeld currents. We
show that two constructions give the same result in tensor products of vector
representations of .Comment: 25 pages, misprints correcte
Why has China grown so fast? The role of physical and human capital formation
Cross-province growth regressions for China are estimated for the reform period. Two research questions are asked. Can the regressions help us to understand why China as a whole has grown so fast? What types of investment matter for China's growth? We address the problem of model uncertainty by adopting two approaches to model selection to consider a wide range of candidate predictors of growth. Starting from the baseline equation, the growth impact of physical and human capital is examined using panel data techniques. Both forms of capital promote economic growth. ‘Investment in innovation’ and private investment are found to be particularly important. Secondary school enrolment contributes to growth, and higher education enrolment even more so
Weight function for the quantum affine algebra
In this article, we give an explicit formula for the universal weight
function of the quantum twisted affine algebra . The
calculations use the technique of projecting products of Drinfeld currents onto
the intersection of Borel subalgebras of different types.Comment: 25 page
Quantum logic for control and manipulation of molecular ions using a frequency comb
Due to their rich level structure, molecules are well-suited for probing time
variation of fundamental constants, precisely measuring parity violation and
time-reversal non-invariance effects, studying quantum mechanical aspects of
chemical reactions, and implementing scalable quantum information processing
architectures. Molecular ions are particularly attractive for these
applications due to their long storage times and the near-perfect isolation
from environment that result in long coherence times required to achieve high
measurement precision and reduce systematic errors. However, the control of
molecular quantum states remains a challenge. Based on quantum logic
techniques, we propose a scheme for preparation, manipulation, and detection of
quantum states of single molecular ions. The scheme relies on coherent coupling
between internal and motional degrees of freedom of the molecular ion via a
frequency comb laser field, while detection and cooling of the motion of ions
is done via a co-trapped atomic ion.Comment: 5 pages, 3 figure
Weight function for the quantum affine algebra
We give a precise expression for the universal weight function of the quantum
affine algebra . The calculations use the technique of
projecting products of Drinfeld currents on the intersections of Borel
subalgebras.Comment: 28 page
Bibliometric cartography of information retrieval research by using co-word analysis
The aim of this study is to map the intellectual structure of the field of Information Retrieval (IR) during the period of 1987-1997. Co-word analysis was employed to reveal patterns and trends in the IR field by measuring the association strengths of terms representative of relevant publications or other texts produced in IR field. Data were collected from Science Citation Index (SCI) and Social Science Citation Index (SSCI) for the period of 1987-1997. In addition to the keywords added by the SCI and SSCI databases, other important keywords were extracted from titles and abstracts manually. These keywords were further standardized using vocabulary control tools. In order to trace the dynamic changes of the IR field, the whole 11-year period was further separated into two consecutive periods: 1987-1991 and 1992-1997. The results show that the IR field has some established research themes and it also changes rapidly to embrace new themes
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