2,838 research outputs found
LITHIUM ISOTOPIC CONSTRAINTS ON THE ORIGIN OF I- AND A-TYPE GRANITES FROM EAST JUNGGAR (NW CHINA) OF THE CENTRAL ASIAN OROGENIC BELT: IMPLICATIONS FOR LI ISOTOPIC FRACTIONATION DURING CRUSTAL ANATEXIS
Though Li isotope fractionation during mantle melting and differentiation of basaltic melts have been proved insignificant, Li isotopic systems during crustal processes remain unclear. To study this, we report combined petrological, Nd-Sr and Li isotopic data for the late Paleozoic coexisting I- and A-type granites in the East Junggar orogen of the Central Asian Orogenic Belt. The granites were formed responding to underplating of mafic magmas in the lower crust in a postcollisional, extensional regime, and intruded into the Paleozoic foldbelts that formed due to extensive oceanic subduction-accretion processes.Though Li isotope fractionation during mantle melting and differentiation of basaltic melts have been proved insignificant, Li isotopic systems during crustal processes remain unclear. To study this, we report combined petrological, Nd-Sr and Li isotopic data for the late Paleozoic coexisting I- and A-type granites in the East Junggar orogen of the Central Asian Orogenic Belt. The granites were formed responding to underplating of mafic magmas in the lower crust in a postcollisional, extensional regime, and intruded into the Paleozoic foldbelts that formed due to extensive oceanic subduction-accretion processes
Evaluating Feynman integrals by the hypergeometry
The hypergeometric function method naturally provides the analytic
expressions of scalar integrals from concerned Feynman diagrams in some
connected regions of independent kinematic variables, also presents the systems
of homogeneous linear partial differential equations satisfied by the
corresponding scalar integrals. Taking examples of the one-loop and
massless functions, as well as the scalar integrals of two-loop vacuum
and sunset diagrams, we verify our expressions coinciding with the well-known
results of literatures. Based on the multiple hypergeometric functions of
independent kinematic variables, the systems of homogeneous linear partial
differential equations satisfied by the mentioned scalar integrals are
established. Using the calculus of variations, one recognizes the system of
linear partial differential equations as stationary conditions of a functional
under some given restrictions, which is the cornerstone to perform the
continuation of the scalar integrals to whole kinematic domains numerically
with the finite element methods. In principle this method can be used to
evaluate the scalar integrals of any Feynman diagrams.Comment: 39 pages, including 2 ps figure
Hadronic production of the doubly charmed baryon via the proton-nucleus and the nucleus-nucleus collisions at the RHIC and LHC
We present a detailed discussion on the doubly charmed baryon
production at the RHIC and LHC via the proton-nucleus (-N) and
nucleus-nucleus (N-N) collision modes. The extrinsic charm mechanism via the
subprocesses and together with the
gluon-gluon fusion mechanism via the subprocess
have been taken into consideration, where the intermediate diquark is in
-state or -state, respectively.
Total and differential cross sections have been discussed under various
collision energies. To compare with the production via proton-proton
collision mode at the LHC, we observe that sizable events can also
be generated via -N and N-N collision modes at the RHIC and LHC. For
examples, about and events can be
accumulated in -Pb and Pb-Pb collision modes at the LHC within one operation
year.Comment: 10 pages, 6 figure
Recommended from our members
Eradication of unresectable liver metastasis through induction of tumour specific energy depletion.
Treatment of liver metastasis experiences slow progress owing to the severe side effects. In this study, we demonstrate a strategy capable of eliminating metastatic cancer cells in a selective manner. Nucleus-targeting W18O49 nanoparticles (WONPs) are conjugated to mitochondria-selective mesoporous silica nanoparticles (MSNs) containing photosensitizer (Ce6) through a Cathepsin B-cleavable peptide. In hepatocytes, upon the laser irradiation, the generated singlet oxygen species are consumed by WONPs, in turn leading to the loss of their photothermally heating capacity, thereby sparing hepatocyte from thermal damage induced by the laser illumination. By contrast, in cancer cells, the cleaved peptide linker allows WONPs and MSNs to respectively target nucleus and mitochondria, where the therapeutic powers could be unleashed, both photodynamically and photothermally. This ensures the energy production of cancer cells can be abolished. We further assess the underlying molecular mechanism at both gene and protein levels to better understand the therapeutic outcome
Memory augment is All You Need for image restoration
Image restoration is a low-level vision task, most CNN methods are designed
as a black box, lacking transparency and internal aesthetics. Although some
methods combining traditional optimization algorithms with DNNs have been
proposed, they all have some limitations. In this paper, we propose a
three-granularity memory layer and contrast learning named MemoryNet,
specifically, dividing the samples into positive, negative, and actual three
samples for contrastive learning, where the memory layer is able to preserve
the deep features of the image and the contrastive learning converges the
learned features to balance. Experiments on Derain/Deshadow/Deblur task
demonstrate that these methods are effective in improving restoration
performance. In addition, this paper's model obtains significant PSNR, SSIM
gain on three datasets with different degradation types, which is a strong
proof that the recovered images are perceptually realistic. The source code of
MemoryNet can be obtained from https://github.com/zhangbaijin/MemoryNe
Is ChatGPT a Good Multi-Party Conversation Solver?
Large Language Models (LLMs) have emerged as influential instruments within
the realm of natural language processing; nevertheless, their capacity to
handle multi-party conversations (MPCs) -- a scenario marked by the presence of
multiple interlocutors involved in intricate information exchanges -- remains
uncharted. In this paper, we delve into the potential of generative LLMs such
as ChatGPT and GPT-4 within the context of MPCs. An empirical analysis is
conducted to assess the zero-shot learning capabilities of ChatGPT and GPT-4 by
subjecting them to evaluation across three MPC datasets that encompass five
representative tasks. The findings reveal that ChatGPT's performance on a
number of evaluated MPC tasks leaves much to be desired, whilst GPT-4's results
portend a promising future. Additionally, we endeavor to bolster performance
through the incorporation of MPC structures, encompassing both speaker and
addressee architecture. This study provides an exhaustive evaluation and
analysis of applying generative LLMs to MPCs, casting a light upon the
conception and creation of increasingly effective and robust MPC agents.
Concurrently, this work underscores the challenges implicit in the utilization
of LLMs for MPCs, such as deciphering graphical information flows and
generating stylistically consistent responses.Comment: Accepted by Findings of EMNLP 202
DiffuSIA: A Spiral Interaction Architecture for Encoder-Decoder Text Diffusion
Diffusion models have emerged as the new state-of-the-art family of deep
generative models, and their promising potentials for text generation have
recently attracted increasing attention. Existing studies mostly adopt a single
encoder architecture with partially noising processes for conditional text
generation, but its degree of flexibility for conditional modeling is limited.
In fact, the encoder-decoder architecture is naturally more flexible for its
detachable encoder and decoder modules, which is extensible to multilingual and
multimodal generation tasks for conditions and target texts. However, the
encoding process of conditional texts lacks the understanding of target texts.
To this end, a spiral interaction architecture for encoder-decoder text
diffusion (DiffuSIA) is proposed. Concretely, the conditional information from
encoder is designed to be captured by the diffusion decoder, while the target
information from decoder is designed to be captured by the conditional encoder.
These two types of information flow run through multilayer interaction spirally
for deep fusion and understanding. DiffuSIA is evaluated on four text
generation tasks, including paraphrase, text simplification, question
generation, and open-domain dialogue generation. Experimental results show that
DiffuSIA achieves competitive performance among previous methods on all four
tasks, demonstrating the effectiveness and generalization ability of the
proposed method.Comment: Work in Progres
- …