187 research outputs found
Intersection-free Robot Manipulation with Soft-Rigid Coupled Incremental Potential Contact
This paper presents a novel simulation platform, ZeMa, designed for robotic
manipulation tasks concerning soft objects. Such simulation ideally requires
three properties: two-way soft-rigid coupling, intersection-free guarantees,
and frictional contact modeling, with acceptable runtime suitable for deep and
reinforcement learning tasks. Current simulators often satisfy only a subset of
these needs, primarily focusing on distinct rigid-rigid or soft-soft
interactions. The proposed ZeMa prioritizes physical accuracy and integrates
the incremental potential contact method, offering unified dynamics simulation
for both soft and rigid objects. It efficiently manages soft-rigid contact,
operating 75x faster than baseline tools with similar methodologies like
IPC-GraspSim. To demonstrate its applicability, we employ it for parallel grasp
generation, penetrated grasp repair, and reinforcement learning for grasping,
successfully transferring the trained RL policy to real-world scenarios
Insulin resistance predicts progression of de novo atherosclerotic plaques in patients with coronary heart disease: a one-year follow-up study
BACKGROUND: The aim of our study was to explore and evaluate the relationship between insulin resistance and progression of coronary atherosclerotic plaques. With the great burden coronary heart disease is imposing on individuals, healthcare professionals have already embarked on determining its potential modifiable risk factors in the light of preventive medicine. Insulin resistance has been generally recognized as a novel risk factor based on epidemiological studies; however, few researches have focused on its effect on coronary atherosclerotic plaque progression. METHODS: From June 7, 2007 to December 30, 2011, 366 patients received their index coronary angiogram and were subsequently found to have coronary atherosclerotic plaques or normal angiograms were consecutively enrolled in the study by the department of cardiology at the Ruijin Hospital, which is affiliated to the Shanghai Jiaotong University School of Medicine. All patients had follow-up angiograms after the 1-year period for evaluating the progression of the coronary lesions. The modified Gensini score was adopted for assessing coronary lesions while the HOMA-IR method was utilized for determining the state of their insulin resistance. Baseline characteristics and laboratory test results were described and the binomial regression analysis was conducted to investigate the relationship between insulin resistance and coronary atherosclerotic plaque progression. RESULTS: Index and follow-up Gensini scores were similar between the higher insulin lower insulin resistant groups (9.09 ± 14.33 vs 9.44 ± 12.88, p = 0.813 and 17.21 ± 18.46 vs 14.09 ± 14.18, p =0.358). However the Gensini score assessing coronary lesion progression between both visits was significantly elevated in the higher insulin resistant group (8.13 ± 11.83 versus 4.65 ± 7.58, p = 0.019). Multivariate logistic binomial regression analysis revealed that insulin resistance (HOMA-IR > 3.4583) was an independent predictor for coronary arterial plaque progression (OR = 4.969, p = 0.011). We also divided all the participants into a diabetic (n = 136) and a non-diabetic group (n = 230), and HOMA-IR remained an independent predictor for atherosclerosis plaque progression. CONCLUSIONS: Insulin resistance is an independent predictor of atherosclerosis plaque progression in patients with coronary heart disease in both the diabetic and non-diabetic population
Resonant Quantum Principal Component Analysis
Principal component analysis has been widely adopted to reduce the dimension
of data while preserving the information. The quantum version of PCA (qPCA) can
be used to analyze an unknown low-rank density matrix by rapidly revealing the
principal components of it, i.e. the eigenvectors of the density matrix with
largest eigenvalues. However, due to the substantial resource requirement, its
experimental implementation remains challenging. Here, we develop a resonant
analysis algorithm with the minimal resource for ancillary qubits, in which
only one frequency scanning probe qubit is required to extract the principal
components. In the experiment, we demonstrate the distillation of the first
principal component of a 44 density matrix, with the efficiency of
86.0% and fidelity of 0.90. This work shows the speed-up ability of quantum
algorithm in dimension reduction of data and thus could be used as part of
quantum artificial intelligence algorithms in the future.Comment: 10 pages, 7 figures, have been waiting for the reviewers' responses
for over 3 month
Integrated multi-omics of the gastrointestinal microbiome and ruminant host reveals metabolic adaptation underlying early life development
publishedVersio
High-fidelity single-shot readout of single electron spin in diamond with spin-to-charge conversion
High fidelity single-shot readout of qubits is a crucial component for
fault-tolerant quantum computing and scalable quantum networks. In recent
years, the nitrogen-vacancy (NV) center in diamond has risen as a leading
platform for the above applications. The current single-shot readout of the NV
electron spin relies on resonance fluorescence method at cryogenic temperature.
However, the the spin-flip process interrupts the optical cycling transition,
therefore, limits the readout fidelity. Here, we introduce a spin-to-charge
conversion method assisted by near-infrared (NIR) light to suppress the
spin-flip error. This method leverages high spin-selectivity of cryogenic
resonance excitation and high flexibility of photonionization. We achieve an
overall fidelity 95% for the single-shot readout of an NV center electron
spin in the presence of high strain and fast spin-flip process. With further
improvements, this technique has the potential to achieve spin readout fidelity
exceeding the fault-tolerant threshold, and may also find applications on
integrated optoelectronic devices
- …