121 research outputs found
Treatment of Soft Soils by Dynamic Compaction
This paper reports a case study on treatment of soft days by dynamic compaction. A special technique adopted in this project allowed massive stiff columns to be formed under the impact locations, and the soils between these impact locations to be replaced and mixed with granular fills, hence creating a composite foundation. The comprehensive field investigation showed that the allowable bearing capacity of the treated ground (as a composite foundation) was 350 kPa, a significant increase compared with that of untreated ground (70 kPa). The achieved stiffness modulus of the composite foundation was 24 MPa
Prompt-Enhanced Software Vulnerability Detection Using ChatGPT
With the increase in software vulnerabilities that cause significant economic
and social losses, automatic vulnerability detection has become essential in
software development and maintenance. Recently, large language models (LLMs)
like GPT have received considerable attention due to their stunning
intelligence, and some studies consider using ChatGPT for vulnerability
detection. However, they do not fully consider the characteristics of LLMs,
since their designed questions to ChatGPT are simple without a specific prompt
design tailored for vulnerability detection. This paper launches a study on the
performance of software vulnerability detection using ChatGPT with different
prompt designs. Firstly, we complement previous work by applying various
improvements to the basic prompt. Moreover, we incorporate structural and
sequential auxiliary information to improve the prompt design. Besides, we
leverage ChatGPT's ability of memorizing multi-round dialogue to design
suitable prompts for vulnerability detection. We conduct extensive experiments
on two vulnerability datasets to demonstrate the effectiveness of
prompt-enhanced vulnerability detection using ChatGPT. We also analyze the
merit and demerit of using ChatGPT for vulnerability detection.Comment: 13 Pages, 4 figure
Improving Knowledge-aware Dialogue Generation via Knowledge Base Question Answering
Neural network models usually suffer from the challenge of incorporating
commonsense knowledge into the open-domain dialogue systems. In this paper, we
propose a novel knowledge-aware dialogue generation model (called TransDG),
which transfers question representation and knowledge matching abilities from
knowledge base question answering (KBQA) task to facilitate the utterance
understanding and factual knowledge selection for dialogue generation. In
addition, we propose a response guiding attention and a multi-step decoding
strategy to steer our model to focus on relevant features for response
generation. Experiments on two benchmark datasets demonstrate that our model
has robust superiority over compared methods in generating informative and
fluent dialogues. Our code is available at https://github.com/siat-nlp/TransDG.Comment: Accepted by AAAI-202
A New Caspase-8 Isoform Caspase-8s Increased Sensitivity to Apoptosis in Jurkat Cells
Caspase-8 is a key initiator of death receptor-induced apoptosis. Here we report a novel short isoform of caspase-8 (caspase-8s), which encodes the first (Death Effector Domain) DED and part of the second DED, missing the C-terminal caspase domain. In vivo binding assays showed that transfected caspase-8s bound to (Fas-associated death domain protein) FADD, the adaptor protein in (death-induced signal complex) DISC. To investigate the potential effects of caspase-8s on cell apoptosis, Jurkat cells were stably transfected with caspase-8s. Overexpression of caspase-8s increased sensitivity to the apoptotic stimuli, Fas-agonistic antibody CH11. These results suggest that caspase-8s may act as a promoter of apoptosis through binding to FADD and is involved in the regulation of apoptosis. In addition, the results also indicate that the first DED was an important structure mediating combination between caspase-8 and FADD
Type-II Ising Pairing in Few-Layer Stanene
Spin-orbit coupling has proven indispensable in realizing topological
materials and more recently Ising pairing in two-dimensional superconductors.
This pairing mechanism relies on inversion symmetry breaking and sustains
anomalously large in-plane polarizing magnetic fields whose upper limit is
expected to diverge at low temperatures, although experimental demonstration of
this has remained elusive due to the required fields. In this work, the
recently discovered superconductor few-layer stanene, i.e. epitaxially strained
-Sn, is shown to exhibit a new type of Ising pairing between carriers
residing in bands with different orbital indices near the -point. The
bands are split as a result of spin-orbit locking without the participation of
inversion symmetry breaking. The in-plane upper critical field is strongly
enhanced at ultra-low temperature and reveals the sought for upturn
Interaction and Regulation of Carbon, Nitrogen, and Phosphorus Metabolisms in Root Nodules of Legumes
Members of the plant family Leguminosae (Fabaceae) are unique in that they have evolved a symbiotic relationship with rhizobia (a group of soil bacteria that can fix atmospheric nitrogen). Rhizobia infect and form root nodules on their specific host plants before differentiating into bacteroids, the symbiotic form of rhizobia. This complex relationship involves the supply of C4-dicarboxylate and phosphate by the host plants to the microsymbionts that utilize them in the energy-intensive process of fixing atmospheric nitrogen into ammonium, which is in turn made available to the host plants as a source of nitrogen, a macronutrient for growth. Although nitrogen-fixing bacteroids are no longer growing, they are metabolically active. The symbiotic process is complex and tightly regulated by both the host plants and the bacteroids. The metabolic pathways of carbon, nitrogen, and phosphate are heavily regulated in the host plants, as they need to strike a fine balance between satisfying their own needs as well as those of the microsymbionts. A network of transporters for the various metabolites are responsible for the trafficking of these essential molecules between the two partners through the symbiosome membrane (plant-derived membrane surrounding the bacteroid), and these are in turn regulated by various transcription factors that control their expressions under different environmental conditions. Understanding this complex process of symbiotic nitrogen fixation is vital in promoting sustainable agriculture and enhancing soil fertility
Spin-glass ground state in a triangular-lattice compound YbZnGaO
We report on comprehensive results identifying the ground state of a
triangular-lattice structured YbZnGaO to be spin glass, including no
long-range magnetic order, prominent broad excitation continua, and absence of
magnetic thermal conductivity. More crucially, from the ultralow-temperature
a.c. susceptibility measurements, we unambiguously observe frequency-dependent
peaks around 0.1 K, indicating the spin-glass ground state. We suggest this
conclusion to hold also for its sister compound YbMgGaO, which is confirmed
by the observation of spin freezing at low temperatures. We consider disorder
and frustration to be the main driving force for the spin-glass phase.Comment: Version as accepted to PR
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