Diagnosis of compound faults of rolling bearings through adaptive maximum correlated kurtosis deconvolution

Guiji Tang,Xiaolong Wang,Yuling He 대한기계학회 2016 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.30 No.1

This paper proposes a new diagnosis method based on Adaptive maximum correlated kurtosis deconvolution (AMCKD) for accurateidentification of compound faults of rolling bearings. The AMCKD method combines the powerful capability of cuckoo search algorithmfor global optimization with the advantage of Maximum correlated kurtosis deconvolution (MCKD) for impact signal extraction. In contrastto traditional methods, such as direct envelop spectrum, Discrete wavelet transform (DWT), and empirical mode decomposition, theproposed method extracts each fault signal related to the single failed part from the compound fault signals and effectively separates thecoupled fault features. First, the original signal is processed using AMCKD method. Demodulation operation is then performed on theobtained single fault signal, and the envelope spectrum is calculated to identify the characteristic frequency information. Verification isperformed on simulated and experimental signals. Results show that the proposed method is more suitable for detecting compound faultsin rolling bearings compared with traditional methods. This research provides a basis for improving the monitoring and diagnosis precisionof rolling bearings.

Mechanistic Insight into Phenolic Compounds Toxicity and State-of-the-art Strategies for Enhancing the Tolerance of Escherichia coli to Phenolic Compounds

Lina Liu,Xiaolong Ma,Muhammad Bilal,Linlin Wei,Shijie Tang,Hong-zhen Luo,Yuping Zhao,Xuguo Duan 한국생물공학회 2022 Biotechnology and Bioprocess Engineering Vol.27 No.4

Efficient use of lignocellulosic biomass is a prerequisite for sustainable biofuel production while simultaneously contributing to environmental protection. However, phenolic compounds produced during the chemical treatment of lignocellulose inhibit the growth and metabolism of microorganisms, such as Escherichia coli, which is one of the ideal strains for producing target products by microbial fermentation. To provide new ideas for studying microbial tolerance to environmental stress and providing technical support for constructing the engineering strains with high yields of phenolic compounds, this review elucidates the inhibition mechanism of phenols to E. coli. Secondly, a comprehensive and systematic review of current approaches for improving the phenolic-tolerance of E. coli is provided, including strain domestication, random mutagenesis, regulating the expression of outer membrane proteins, changing the composition of membrane fatty acids, accelerating the efflux of phenolic compounds, engineered bacterial biofloc formation, and transcriptome analysis. Finally, this review ends with some questions that still exist today, and prospective strategies are outlined for further improving the phenols-tolerance of E. coli. This review provided a theoretical basis for research into microbial tolerance to environmental stress and the development of engineered strains with high yield of phenolic compounds.

Visible-light driven efficient elimination of organic hazardous and Cr (VI) over BiOCl modified by Chinese Baijiu distillers’ grain-based biochar

Xingyun Jin,Xiaolong Tang,Huan Li,Xiaoqian Tang,Jian zhang Li,Jun bo Zhong,Shulin Zhang,Dongge Ma 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.107 No.-

In this paper, distillers’ grains biochar (DGBC) was facilely gained by processing the distillers’ grains producedin Chinese Baijiu brewing, and the DGBC was used to modify BiOCl. The prepared DGBC/BiOCl compositephotocatalysts show elevated visible light-driven catalytic performance. X-ray diffraction (XRD)and scanning electron microscope (SEM) suggest the presence of DGBC affects the crystal growth andmicroscopic morphology of BiOCl. The low-temperature electron paramagnetic resonance (EPR) testaffirms more oxygen vacancies (OVs) exist in the DGBC/BiOCl composite photocatalysts. The 0.75-DGBC/BOC photocatalyst holds the highest efficiency for removal of rhodamine B (RhB), tetracycline(TC) and Cr (VI) compared with BiOCl, commercial TiO2 (P25) and other DGBC/BiOCl composites. Giventhe experimental results, the enhanced visible light responsive performance originates from the richOVs introduced by the modification of BiOCl with DGBC and the higher separation rate of photoexcitedcarriers.

Surgical Options for Appropriate Length of J-Pouch Construction for Better Outcomes and Long-term Quality of Life in Patients with Ulcerative Colitis after Ileal Pouch-Anal Anastomosis

Xu Weimin,Tang Wenbo,Ding Wenjun,Hua Zhebin,Wang Yaosheng,Ge Xiaolong,Cui Long,Wu Xiaojian,Zhou Wei,Ding Zhao,Du Peng 거트앤리버 소화기연관학회협의회 2024 Gut and Liver Vol.18 No.1

Background/Aims: Total proctocolectomy with ileal pouch-anal anastomosis (IPAA) is widely accepted as a radical surgery for refractory ulcerative colitis (UC). Definite results on the appropriate pouch length for an evaluation of the risk-to-benefit ratio regarding technical complications and long-term quality of life (QOL) are still scarce. Methods: Data on UC patients who underwent IPAA from 2008 to 2022 in four well-established pouch centers affiliated to China UC Pouch Center Union were collected. Results: A total of 208 patients with a median follow-up time of 6.0 years (interquartile range, 2.3 to 9.0 years) were enrolled. The median lengths of the patients’ short and long pouches were 14.0 cm (interquartile range, 14.0 to 15.0 cm) and 22.0 cm (interquartile range, 20.0 to 24.0 cm), respectively. Patients with a short J pouch configuration were less likely to achieve significantly improved long-term QOL (p=0.015) and were prone to develop late postoperative complications (p=0.042), such as increased defecation frequency (p=0.003) and pouchitis (p=0.035). A short ileal pouch was an independent risk factor for the development of late postoperative complications (odds ratio, 3.100; 95% confidence interval, 1.519 to 6.329; p=0.002) and impaired long-term QOL improvement (odds ratio, 2.221; 95% confidence interval, 1.218 to 4.050, p=0.009). Conclusions: The length of the J pouch was associated with the improvement in long-term QOL and the development of late post-IPAA complications. A long J pouch configuration could be a considerable surgical option for pouch construction.

Combined adsorption and reduction of Cr(VI) from aqueous solution on polyaniline/multiwalled carbon nanotubes composite

Jiahong Wang,Xiaolong Yin,Wei Tang,Hongrui Ma 한국화학공학회 2015 Korean Journal of Chemical Engineering Vol.32 No.9

Polyaniline/multiwalled carbon nanotube (PANI-MWCNT) was prepared by bounding polyaniline on the surface of oxidized multiwalled carbon nanotube. The structure and surface properties of synthesized composites were characterized by Fourier transformed infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), transmission electron microscope (TEM), and its adsorption capability for aqueous Cr(VI) was also studied. Characterized results showed that polyaniline was successfully anchored on the surface of MWCNT. From adsorption experiments the maximum adsorption amount of Cr(VI) onto PANI-MWCNTs was 28.25, 31.75 and 36.76 mg·g−1 at 15, 25 and 35 oC. Thermodynamic parameters showed that the Cr(VI) adsorption process was endothermic, spontaneous and feasible. Cr(VI) adsorption followed pseudo-second-order kinetics. Cr(VI) adsorption on the adsorbent decreases with increasing solution pH. The presence of anions in solution almost has no effect on Cr(VI) adsorption, indicating good selectivity. XPS analysis confirms that electrostatic interaction, reduction and chelation contribute to enhanced Cr(VI) removal. Cr(VI) loaded absorbent can be readily desorbed in 0.1mol·L−1 of NaOH solution, and the desorption rate was 84.12%.

Coal dust exposure induces proliferation and migration of human bronchial epithelial cells

Li Amin,Zhang Yinci,Wang Ruikai,Xu Ruyue,Ma Yongfang,Song Li,Cao Weiya,Xiaolong Tang 대한독성 유전단백체 학회 2023 Molecular & cellular toxicology Vol.19 No.2

Background Coal dust exposure has caused a variety of lung diseases. In addition to genotoxicity and cytotoxicity, other biological changes caused by coal dust (CD) exposure need further study. Objective To observe the cellular transformation eff ects of CD exposure and explore its underlying molecular mechanism, human bronchial epithelial cells (BEAS-2B) were cultured with continuous CD exposure. Methylthiazolyldiphenyl-tetrazolium bromide (MTT) assay, colony formation assay, wound healing assay, next-generation sequencing (NGS) and western blotting were performed to observe the cell proliferation, migration, genomic transcription and pathological signaling pathways. Results We demonstrated that BEAS-2B cells with long-term chronic CD exposure show accelerated proliferation rate and enhanced migration ability, and have altered gene expression profi les and aberrant activation of EGFR/Raf/ERK and PI3K/ AKT/mTOR pathways. Conclusions The results indicate that chronic CD exposure could induce abnormal proliferation and migration of BEAS-2B cells, lead to the transformation potential of human bronchial epithelial cells.