483 research outputs found
Left-symmetric algebroids
In this paper, we introduce a notion of a left-symmetric algebroid, which is
a generalization of a left-symmetric algebra from a vector space to a vector
bundle. The left multiplication gives rise to a representation of the
corresponding sub-adjacent Lie algebroid. We construct left-symmetric
algebroids from -operators on Lie algebroids. We study phase spaces
of Lie algebroids in terms of left-symmetric algebroids. Representations of
left-symmetric algebroids are studied in detail. At last, we study deformations
of left-symmetric algebroids, which could be controlled by the second
cohomology class in the deformation cohomology.Comment: 21 page
Two new species of Coniopteryx Curtis from China (Neuroptera, Coniopterygidae)
Two new species of Coniopterygidae, Coniopteryx (Coniopteryx) tenuisetosa sp. nov., and Coniopteryx (Coniopteryx) serrata sp. nov., are described from China. Both species differ from congeners in characters of the male genitalia. Coniopteryx (Coniopteryx) alticola Sziraki, 2002, is recorded from China for the first time. A key to species of the genus Coniopteryx from China is presented
Higher achievers? Mobility programmes, generic skills and academic learning: a UK case study
The received wisdom is that mobility programmes considerably contribute to students in terms
of the development of generic skills, language and multicultural competence and competitive
advantage in global labour market. Surprisingly, the impacts of mobility programmes on
academic learning have received very limited research interest in the literature. This study uses
students enrolled on international management and modern languages degrees in a British
university to investigate the benefits of a yearlong study abroad programme, on the
development of linguistic and multicultural skills measured by their academic results pre- and
post- international mobility. Using a control group of students who stay on campus, quantitative
data drawn from a longitudinal study over eight years conclusively suggest that study abroad
students academically outperform control group students after controlling for gender, domicile,
ethnicity, socio-economic status, prior academic performance and age. The implications of
these results on higher education and policy making are discussed
ET3D: Efficient Text-to-3D Generation via Multi-View Distillation
Recent breakthroughs in text-to-image generation has shown encouraging
results via large generative models. Due to the scarcity of 3D assets, it is
hardly to transfer the success of text-to-image generation to that of
text-to-3D generation. Existing text-to-3D generation methods usually adopt the
paradigm of DreamFusion, which conducts per-asset optimization by distilling a
pretrained text-to-image diffusion model. The generation speed usually ranges
from several minutes to tens of minutes per 3D asset, which degrades the user
experience and also imposes a burden to the service providers due to the high
computational budget.
In this work, we present an efficient text-to-3D generation method, which
requires only around 8 to generate a 3D asset given the text prompt on a
consumer graphic card. The main insight is that we exploit the images generated
by a large pre-trained text-to-image diffusion model, to supervise the training
of a text conditioned 3D generative adversarial network. Once the network is
trained, we are able to efficiently generate a 3D asset via a single forward
pass. Our method requires no 3D training data and provides an alternative
approach for efficient text-to-3D generation by distilling pre-trained image
diffusion models
Two new species of Coniopteryx Curtis from China (Neuroptera, Coniopterygidae)
Two new species of Coniopterygidae, Coniopteryx (Coniopteryx) tenuisetosa sp. nov., and Coniopteryx (Coniopteryx) serrata sp. nov., are described from China. Both species differ from congeners in characters of the male genitalia. Coniopteryx (Coniopteryx) alticola Sziraki, 2002, is recorded from China for the first time. A key to species of the genus Coniopteryx from China is presented
Electronic, magnetic and optical properties of oxide surfaces, heterostructures and interfaces: role of defects
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