B. C. Wang

A fault diagnosis method with continuous frequency-band indicator embedding and class-aware interpretable feature weighting

Shouxin Du, Qingbin Tong, Xuedong Jiang, B. C. Wang et autres

Neural networks have been extensively applied in mechanical fault diagnosis due to their strong capabilities in feature extraction and classification. However, their limited interpretability and unknown credibility of decision hinder deployment in high-reliability scenarios. To address this issue, a frequency band multi-indicator …

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Adaptive conditional kernel Bures metric learning for bearing cross-device fault diagnosis under small and unbalanced samples

Ziwei Feng, Qingbin Tong, Feiyu Lu, B. C. Wang et autres

Abstract To address the prevalent issues of data distribution shift and class imbalance in cross-device bearing fault diagnosis under industrial environments, this paper proposes a novel adaptive conditional kernel Bures (ACKB) metric learning framework. The method aims to learn domain-invariant features by …

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ACS-DM: Adaptive conditional sampling diffusion model for few-shot machinery fault diagnosis

Qingbin Tong, Ruize Zhu, Feiyu Lu, B. C. Wang et autres

Deep learning has advanced machinery fault diagnosis, yet performance remains constrained by scarce and imbalanced labeled vibration data. We present ACS-DM, an adaptive conditional sampling diffusion framework that synthesizes frequency-faithful yet temporally diverse signals for few-shot regimes. ACS-DM couples a Nested U-Net …

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A time-frequency interpretable framework for bearing fault diagnosis via global channel-region information interaction and weight-CAM

Shouxin Du, Qingbin Tong, Xuedong Jiang, B. C. Wang et autres

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Spectral characteristics and application of multiphoton absorption in cooling single-photon detector

Y.S. Bao, B. C. Wang, Zheng-Mao Wu, Chenguang Tian et autres

We demonstrate the spectral blue-shift of multiphoton absorption in cooling single-photon detector, and obtain the mixture exponent of 2.25 then achieve the blue-shift of 0.18 nm/K with error of ~5.3% related to theoretical result.

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Phenomenological model for mixed multiphoton absorption in bialkali photocathode and application to ultrafast pulse characterization

Zhaohua Li, Xiangkong Zhan, S. C. Wang, B. C. Wang et autres

We propose a phenomenological model composed of concise formulas to describe mixed multiphoton absorption (MPA), revealing its quasi-exponent-function in relation to intensity, complicated spectral features, and polarization dependence, and then demonstrate it perfectly by experiments on a bialkali-cathode photomultiplier-tube (PMT) single-photon detector. …

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High-order actively mode-locked picosecond fiber laser and Poisson single-photon source

H. Y. Wang, Zhaohua Li, Xiangkong Zhan, S. C. Wang et autres

We demonstrate the 200th-order actively mode-locked picosecond fiber laser based on nonlinear polarization rotation in a semiconductor optical amplifier with GHz repetition frequency and 1.63-ps pulse width, which produces a Poisson single-photon source.

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