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| 1 | Are current Chinese national ambient air quality standards on 24-hour averages for particulate matter sufficient to protect public health?显示文摘With rapid economic development and urbanization in recent decades, China has experienced the worsening of ambient air quality. For better air quality management to protect human health, Chinese government revised national ambient air quality standards(NAAQS) for particulate matter(PM) in 2012(GB3095-2012). To assess the effectiveness of current NAAQS for PM on public health in Chinese population, we conducted a metaanalysis on published studies examining the mortality risk of short-term exposure to PM with aerodynamic diameters less than 10 and 2.5 μm(PM_(10) and PM_(2.5)) in China. The reported24-hour concentrations of PM_(10) and PM_(2.5) in studies ranged from 43.5 to 150.1 μg/m^3 and 37.5 to 176.7 μg/m^3. In the pooled excess, mortality risk estimates of short-term exposure to PM.In specific, per 10 μg/m^3 increase in PM_(10), we observed increases of 0.40%(95%CI: 0.33%,0.47%), 0.57%(95%CI: 0.44%, 0.70%) and 0.49%(95%CI: 0.40%, 0.58%) in total, respiratory and cardiovascular mortality, per 10 μg/m^3 increase in PM_(2.5), we observed increases of 0.51%(95%CI: 0.38%, 0.63%), 0.62%(95%CI: 0.52%, 0.73%) and 0.75%(95%CI: 0.54%, 0.95%) in total,respiratory and cardiovascular mortality. Finally, we derived 125 μg/m^3 for PM_(10) and 62.5 μg/m^3 for PM_(2.5) as 24-hour recommendation values based on the pooled estimates. Our results indicated that current Chinese NAAQS for PM could be sufficient in mitigating the excess mortality risk from short-term exposure to ambient PM. However, future research on longterm exposure cohort studies in Chinese population is also essential in revising annual averages for PM in Chinese NAAQS. | Rongshan Wu Xiaoming Song Yingchen Bai Jie Chen Qian Zhao Shuo Liu Hongbing Xu Baihuan Feng Yi Zhang Liuju Zhong Xuemei Wang Pengchang Wu Wei Huang | 2018 | Journal of Environmental Sciences2018，30，9： | 2 |
| 2 | Comparison of dominant frequency attenuation of blasting vibration for different charge structures显示文摘Dominant frequency attenuation is a significant concern for frequency-based criteria of blasting vibration control.It is necessary to develop a concise and practical prediction equation describing dominant frequency attenuation.In this paper,a prediction equation of dominant frequency that accounts for primary parameters influencing the dominant frequency was proposed based on theoretical and dimensional analyses.Three blasting experiments were carried out in the Chiwan parking lot for collecting blasting vibration data used to conduct regression analysis of the proposed prediction equation.The fitting equations were further adopted to compare the reliability of three different types of dominant frequencies in the proposed equation and to explore the effects of different charge structures on the dominant frequency attenuation.The apparent frequency proved to be more reliable to express the attenuation law of the dominant frequency.The reliability and superiority of the proposed equation employing the apparent frequency were verified by comparison with the other five prediction equations.The smaller blasthole diameter or decoupling ratio leads to the higher initial value and corresponding faster attenuation of the dominant frequency.The blasthole diameter has a greater influence on the dominant frequency attenuation than the decoupling ratio does.Among the charge structures applied in the experiments,the charge structure with decoupling ratio of 1.5 and blasthole diameter of 48 mm results in the greatest initial value and corresponding fastest attenuation of the dominant frequency. | Pengchang Sun Wenbo Lu Junru Zhou Xincheng Huang Ming Chen Qi Li | 2022 | Journal of Rock Mechanics and Geotechnical Engineering2022，14，2： | 2 |
| 3 | High performance silicon/carbon composite prepared by in situ carbon-thermal reduction for lithium ion batteries显示文摘 | Xuelin Yang Pengchang Zhang Zhaoyin Wen Lulu Zhang | 2010 | Journal of Alloys and Compounds2010，，1： | 1 |
| 4 | Prediction of Intrinsically Disordered Proteins Based on Deep Neural Network-ResNet18显示文摘Accurately,reliably and rapidly identifying intrinsically disordered(IDPs)proteins is essential as they often play important roles in various human diseases;moreover,they are related to numerous important biological activities.However,current computational methods have yet to develop a network that is sufficiently deep tomake predictions about IDPs and demonstrate an improvement in performance.During this study,we constructed a deep neural network that consisted of five identical variant models,ResNet18,combined with an MLP network,for classification.Resnet18 was applied for the first time as a deep model for predicting IDPs,which allowed the extraction of information fromIDP residues in greater detail and depth,and this information was then passed through the MLP network for the final identification process.Two well-known datasets,MXD494 and R80,were used as the blind independent datasets to compare their performance with that of our method.The simulation results showed that Matthew’s correlation coefficient obtained using our deep network model was 0.517 on the blind R80 dataset and 0.450 on the MXD494 dataset;thus,our method outperformed existing methods. | Jie Zhang Jiaxiang Zhao Pengchang Xu | 2022 | Computer Modeling in Engineering & Sciences2022，，5： | 1 |
| 5 | Coupled-ridge waveguide quantum cascade laser array lasing at λ~5μm显示文摘In this work,we demonstrated high-power quantum cascade laser(QCL)arrays lasing at λ~5μm by employing an optimized coupled-ridge waveguide(CRW)structure.Five-element QCL arrays were simulated and fabricated through a two-step etching method to extend the CRW structure to a mid-wave infrared regime.A lateral far-field with the main peak near a diffraction-limited intensity curve of about 10°was observed by properly designing a geometric shape of the ridges and interspaces.By introducing a buried 2nd-order distributed feedback(DFB)grating,substrate emission with a radiation power above 1 W at 25℃ is achieved.Single longitudinal mode operation is obtained by changing the temperature of the heatsink with a good linear wavelength tuning coefficient of -0.2 cm^(-1)/K. | Pengchang Yang Jinchuan Zhang Zenghui Gu Chuanwei Liu Yue Zhao Fengmin Cheng Shenqiang Zhai Ning Zhuo Junqi Liu Lijun Wang Shuman Liu Fengqi Liu | 2021 | Journal of Semiconductors2021，42，9： | 1 |
| 6 | 显示文摘 | Xue Pengchang LU Ran LI Dongmei | 2004 | Langmuir2004，20，25： | 1 |
| 7 | High performance silicon/carboncomposite prepared by in situ carbon - ther-mal reduction for lithium ion batteries 显示文摘 | Xuelin Yang Pengchang Zhang ZhaoyinWen | 2010 | Journal of Alloys and Compounds2010，496，12： | 1 |
| 8 | Sanxingdui Cultural Relics Recognition Algorithm Based on Hyperspectral Multi-Network Fusion显示文摘Sanxingdui cultural relics are the precious cultural heritage of humanity with high values of history,science,culture,art and research.However,mainstream analytical methods are contacting and detrimental,which is unfavorable to the protection of cultural relics.This paper improves the accuracy of the extraction,location,and analysis of artifacts using hyperspectral methods.To improve the accuracy of cultural relic mining,positioning,and analysis,the segmentation algorithm of Sanxingdui cultural relics based on the spatial spectrum integrated network is proposed with the support of hyperspectral techniques.Firstly,region stitching algorithm based on the relative position of hyper spectrally collected data is proposed to improve stitching efficiency.Secondly,given the prominence of traditional HRNet(High-Resolution Net)models in high-resolution data processing,the spatial attention mechanism is put forward to obtain spatial dimension information.Thirdly,in view of the prominence of 3D networks in spectral information acquisition,the pyramid 3D residual network model is proposed to obtain internal spectral dimensional information.Fourthly,four kinds of fusion methods at the level of data and decision are presented to achieve cultural relic labeling.As shown by the experiment results,the proposed network adopts an integrated method of data-level and decision-level,which achieves the optimal average accuracy of identification 0.84,realizes shallow coverage of cultural relics labeling,and effectively supports the mining and protection of cultural relics. | Shi Qiu Pengchang Zhang Xingjia Tang Zimu Zeng Miao Zhang Bingliang Hu | 2023 | Computers, Materials & Continua2023，77，12： | 0 |
| 9 | Dual-mode distributed feedback quantum cascade laser based on stacked 3D monolithic integration for on-chip multi-channel gas sensing显示文摘To facilitate the development of on-chip integrated mid-infrared multi-channel gas sensing systems,we propose a high-power dual-mode(7.01 and 7.5μm)distributed feedback quantum cascade laser based on stacked 3D monolithic integration.Longitudinal mode control is achieved by preparing longitudinal nested bi-periodic compound one-dimensional Bragg gratings along the direction of the cavity length in the confinement layer.Additionally,transverse coherent coupling ridges perpendicular to the cavity length direction are fabricated in the upper waveguide layer to promote the fundamental transverse mode output when all ridges are in phase.Stable dual-wavelength simultaneous emission with a side-mode suppression ratio of more than 20 dB was achieved by holographic exposure and wet etching.The entire spectral tuning range covers nearly 100 nm through joint tuning of the injection current and heat-sink temperature.High peak power and beam quality are guaranteed by the parallel coherent integration of seven-element ridge arrays.The device operates in a fundamental supermode with a single-lobed far-field pattern,and its peak output power reaches 3.36 W in pulsed mode at 20℃.This dual-mode laser chip has the potential for in-situ on-chip simultaneous detection of CH4and C2H6gases in leak monitoring. | XIYU LU YANJIAO GUAN PENGCHANG YANG SHAN NIU YU MA LIJUN WANG NING ZHUO JINCHUAN ZHANG SHENQIANG ZHAI FENGMIN CHENG SHUMAN LIU FENGQI LIU JUNQI LIU | 2023 | Photonics Research2023，11，12： | 0 |
| 10 | Spontaneous Self-healing Bio-inspired Lubricant-infused Coating on Pipeline Steel Substrate with Reinforcing Anti-corrosion,Anti-fouling,and Anti-scaling Properties显示文摘Superhydrophobic surfaces(SHS)and slippery lubricant-infused porous surfaces(SLIPS)attract great attention due to their multiple properties in both industries and our daily lives.Here,we first fabricated the SHS with micro-scale flower-like structures composed of nano-sheets on pipeline steel substrate.Then,we obtained the SLIPS by spin-coating lubricant into gaps of micro-scale flower-like structures,with the air still trapped among gaps of nano-sheets.The SLIPS shows excellent liquid repellency as the SHS.The SLIPS also shows stability after the scour of flowing water.These results of polarization curves(Tafel)and electrochemical impedance spectroscopies deduced the SLIPS with better and more stable anti-corrosion property than the SHS.Compared with the SHS,the lack of attachment and CaCO_(3) on the SLIPS indicates that the SLIPS demonstrates better anti-fouling and anti-scaling properties than the SHS.Moreover,the SLIPS shows promising wear resistance under the abrasion simulated by sandpaper compared with the SHS.Notably,the air trapped among nano-sheets is conducive to the lubricant flowing to the surface quickly,exhibiting spontaneous self-healing in atmosphere,even if part flower-like structures of the SLIPS subject to damage with the lubricant consumed after scratched. | Hao Li Yujie Peng Kai Zhang Pengchang Li Lei Xin Xiaoli Yin Sirong Yu | 2022 | Journal of Bionic Engineering2022，19，6： | 0 |
| 11 | Epidemiologic Features, Radiological Findings and Clinical Outcomes of 19 Patients with COVID-19 in a Single Center in Beijing, China显示文摘Objective To describe the epidemiologic,clinical,laboratory,and radiological characteristics and prognoses of COVID-19 confirmed patients in a single center in Beijing,China.Methods The study retrospectively included 19 patients with nucleic acid-confirmed SARS-CoV^2 infection at our hospital from January 20 to March 5,2020.The final follow-up date was March 14,2020.The epidemiologic and clinical information was obtained through direct communication with the patients or their family members.Laboratory results retrieved from medical records and radiological images were analyzed both qualitatively by two senior chest radiologists as well as quantitatively via an artificial intelligence software.Results We identified 5 family clusters(13/19,68.4%)from the study cohort.All cases had good clinical prognoses and were either mild(3/19)or moderate(16/19)clinical types.Fever(15/19,78.9%)and dry cough(11/19,57.9%)were common symptoms,Two patients received negative results for more than three consecutive viral nucleic acid tests.The longest interval between an initial CT abnormal finding and a confirmed diagnosis was 30 days.One patient's nucleic acid test turned positive on the follow-up examination after discharge.The presence of radiological abnormalities was non-specific for the diagnosis of COVID-19.Conclusions COVID-19 patients with mild or no clinical symptoms are common in Beijing,China.Radiological abnormalities are mostly non-specific and massive CT examinations for COVID-19 screening should be avoided.Analyses of the contact histories of diagnosed cases in combination with clinical,radiological and laboratory findings are crucial for the early detection of COVID-19.Close monitoring after discharge is also recommended. | Lan Song Zhenchen Zhu Ruijie Zhao Pengchang Li Duxue Tian Tiekuan Du Yan Xu Qiwen Yang Wei Cao Wei Song Zhengyu Jin | 2021 | Chinese Medical Sciences Journal2021，36，2： | 0 |
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