6,991 research outputs found
The Role of Chaos in One-Dimensional Heat Conductivity
We investigate the heat conduction in a quasi 1-D gas model with various
degree of chaos. Our calculations indicate that the heat conductivity
is independent of system size when the chaos of the channel is strong enough.
The different diffusion behaviors for the cases of chaotic and non-chaotic
channels are also studied. The numerical results of divergent exponent
of heat conduction and diffusion exponent are in consistent with the
formula . We explore the temperature profiles numerically and
analytically, which show that the temperature jump is primarily attributed to
superdiffusion for both non-chaotic and chaotic cases, and for the latter case
of superdiffusion the finite-size affects the value of remarkably.Comment: 6 pages, 7 figure
Function Analysis of Industrial Robot under Cubic Polynomial Interpolation in Animation Simulation Environment
In order to study the effect of cubic polynomial interpolation in the trajectory planning of polishing robot manipulator, firstly, the articular robot operating arm is taken as the research object, and the overall system of polishing robot operating arm with 7 degrees of freedom is constructed. Then through the transformation of space motion and pose coordinate system, Denavit-Hartenberg (D-H) Matrix is introduced to describe the coordinate direction and parameters of the adjacent connecting rod of the polishing robot, and the kinematic model of the robot is built, and the coordinate direction and parameters of its adjacent link are described. A multi-body Dynamic simulation software, Automatic Dynamic Analysis of Mechanical Systems (ADAMS), is used to analyze the kinematic simulation of the robot operating arm system. Finally, the trajectory of the robot manipulator is planned based on the cubic polynomial difference method, and the simulation is verified by Matrix Laboratory (MATLAB). Through calculation, it is found that the kinematic model of polishing robot operating arm constructed in this study is in line with the reality; ADAMS software is used to generate curves of the rotation angles of different joint axes and the displacement of end parts of the polishing robot operating arm changing with time. After obtaining relevant parameters, they are put into the kinematic equation constructed in this study, and the calculated position coordinates are consistent with the detection results; moreover, the polishing robot constructed in this study can realize the functions of deburring, polishing, trimming, and turning table. MATLAB software is used to generate the simulation of the movement trajectory of the polishing robot operating arm, which can show the change curve of angle and angular velocity. The difference between the angle at which the polishing robot reaches the polishing position, the change curve of angular velocity, and the time spent before and after the path optimization is compared. It is found that after path optimization based on cubic polynomial, the change curve of the polishing robot's angle and angular velocity is smoother, and the time is shortened by 17.21s. It indicates that the cubic polynomial interpolation method can realize the trajectory planning of the polishing robot operating arm, moreover, the optimized polishing robot has a continuous and smooth trajectory, which can improve the working efficiency of the robot
Controlling the Intrinsic Josephson Junction Number in a Mesa
In fabricating intrinsic Josephson
junctions in 4-terminal mesa structures, we modify the conventional fabrication
process by markedly reducing the etching rates of argon ion milling. As a
result, the junction number in a stack can be controlled quite satisfactorily
as long as we carefully adjust those factors such as the etching time and the
thickness of the evaporated layers. The error in the junction number is within
. By additional ion etching if necessary, we can controllably decrease
the junction number to a rather small value, and even a single intrinsic
Josephson junction can be produced.Comment: to bu published in Jpn. J. Appl. Phys., 43(7A) 200
Medium effects on the selection of sequences folding into stable proteins in a simple model
We study the medium effects on the selection of sequences in protein folding
by taking account of the surface potential in HP-model. Our analysis on the
proportion of H and P monomers in the sequences gives a direct interpretation
that the lowly designable structures possess small average gap. The numerical
calculation by means of our model exhibits that the surface potential enhances
the average gap of highly designable structures. It also shows that a most
stable structure may be no longer the most stable one if the medium parameters
changed.Comment: 4 pages, 4 figure
Panoptic Scene Graph Generation with Semantics-prototype Learning
Panoptic Scene Graph Generation (PSG) parses objects and predicts their
relationships (predicate) to connect human language and visual scenes. However,
different language preferences of annotators and semantic overlaps between
predicates lead to biased predicate annotations in the dataset, i.e. different
predicates for same object pairs. Biased predicate annotations make PSG models
struggle in constructing a clear decision plane among predicates, which greatly
hinders the real application of PSG models. To address the intrinsic bias
above, we propose a novel framework named ADTrans to adaptively transfer biased
predicate annotations to informative and unified ones. To promise consistency
and accuracy during the transfer process, we propose to measure the invariance
of representations in each predicate class, and learn unbiased prototypes of
predicates with different intensities. Meanwhile, we continuously measure the
distribution changes between each presentation and its prototype, and
constantly screen potential biased data. Finally, with the unbiased
predicate-prototype representation embedding space, biased annotations are
easily identified. Experiments show that ADTrans significantly improves the
performance of benchmark models, achieving a new state-of-the-art performance,
and shows great generalization and effectiveness on multiple datasets
Effect of PPARγ agonist (rosiglitazone) on the secretion of Th2 cytokine in asthma mice
AbstractObjectiveTo explore the effect of PPARγ agonist (rosiglitazone) on the secretion of Th2 cytokines and the proportion of immune cell subsets in asthma mice.MethodsOvalbumin (OVA)-sensitized mice were used to build asthma models. Those mice were divided into the normal control group, model group and rosiglitazone group. Differences of the changes in lung histopathology of mice in the three groups were observed through hematoxylin and eosin (HE) strain, and the numbers of the total cells, eosinophils and neutrophils in BALF of mice in the three groups were compared. ELISA and real-time PCR were employed to detect the protein levels of interleukin (IL)-5, IL-13, IL-4 and IL-10 and mRNA level, respectively. Flow cytometry number was implied to analyze the proportion of immune cell subsets in peripheral blood of mice.ResultsCompared with the mice in the control group, and mice of the model group, the infiltration of inflammatory cells in BALF increased, bronchial smooth muscle became thickened, a large amount of collagen deposited, the secretion of Th2 cytokine increased significantly, the ratio of regulatory T cells (Treg) decreased, the ratio of T17 cells rose distinctly; while in mice of the rosiglitazone group, the changes of their lung histopathology were improved obviously, the number of infiltration of inflammatory cells declined, the thickened smooth muscle relieved, the deposition of collagen decreased, the secretion of Th2 cytokine was inhibited, the ratio of Treg went up, and the increased of the ratio of T17 cells was inhibited but still not return to normal level.ConclusionsRosiglitazone can regulate the proportion of Treg and Th17 cells and inhibit the secretion of Th2 cytokines, which inhibit the airway inflammatory response for asthma mice effectively
(meso-5,7,7,12,14,14-Hexamethyl-1,4,8,11-tetraÂazacycloÂtetraÂdeca-4,11-diene)nickel(II) bisÂ[O,O′-bis(4-methylÂphenÂyl) dithioÂphosphate]
In the title compound, [Ni(C16H32N4)](C14H14O2PS2)2 or [Ni(trans[14]dien)][S2P(OC6H4Me-4)2]2, where trans[14]dien is meso-5,7,7,12,14,14-hexaÂmethyl-1,4,8,11-tetraÂazacycloÂtetraÂdeca-4,11-diene, the NiII ion lies across a centre of inversion and is four-coordinated in a relatively undistorted square-planar arrangement by the four N atoms of the macrocyclic ligand trans[14]dien. The two O,O′-di(4-methylÂphenÂyl)dithioÂphosÂphates act as counter-ions to balance the charge. Important geometric data include Ni—N = 1.9135 (16) and 1.9364 (15) Å
THiFLY Research at SemEval-2023 Task 7: A Multi-granularity System for CTR-based Textual Entailment and Evidence Retrieval
The NLI4CT task aims to entail hypotheses based on Clinical Trial Reports
(CTRs) and retrieve the corresponding evidence supporting the justification.
This task poses a significant challenge, as verifying hypotheses in the NLI4CT
task requires the integration of multiple pieces of evidence from one or two
CTR(s) and the application of diverse levels of reasoning, including textual
and numerical. To address these problems, we present a multi-granularity system
for CTR-based textual entailment and evidence retrieval in this paper.
Specifically, we construct a Multi-granularity Inference Network (MGNet) that
exploits sentence-level and token-level encoding to handle both textual
entailment and evidence retrieval tasks. Moreover, we enhance the numerical
inference capability of the system by leveraging a T5-based model, SciFive,
which is pre-trained on the medical corpus. Model ensembling and a joint
inference method are further utilized in the system to increase the stability
and consistency of inference. The system achieves f1-scores of 0.856 and 0.853
on textual entailment and evidence retrieval tasks, resulting in the best
performance on both subtasks. The experimental results corroborate the
effectiveness of our proposed method. Our code is publicly available at
https://github.com/THUMLP/NLI4CT.Comment: Accepted by SemEval202
- …