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| 1 | Effects of initial particle gradation and rock content on crushing behaviors of weathered phyllite fills——A case of eastern Ankang section of Shiyan—Tianshui highway,China显示文摘The objective of this paper is to investigate the effects of initial particle gradation and rock content on the crushing behavior(i.e.grain size before and after crushing) of weathered phyllite fills.Compaction tests were conducted on weathered phyllite fills with rock contents of 35%,45%,55%,65% and 75%(by weight).First,the particle size distributions(PSDs) were observed before and after compaction,and then the particle breakage of weathered phyllite fills was analyzed by fractal dimension.Relative fractal dimension was proposed to evaluate the effects of initial rock content and initial gradation on the particle breakage.It was found that the fractal dimension method can well characterize the crushing behaviors of the weathered phyllite fills.The finer the fills were,the more they were compacted.That is,after the first compaction,the relative fractal dimension of the weathered phyllite fills increased as the rock content increased,reaching the values of 0.013,0.016,0.024,0.037 and 0.08,respectively.After the second compaction,these relative fractal dimension values,dominated by the initial particle gradation,became 0.059,0.072,0.052,0.095 and 0.118,respectively.In conclusion,the weathered phyllite fills with 55% rock content exhibited the least breakage and were most suitable for filling the subgrade.Findings in this paper will provide significant guidance for the construction of weathered phyllite filling subgrade in future projects. | Feifei Liu Xuesong Mao Yushuo Fan Linping Wu Wei Victor Liu | 2020 | Journal of Rock Mechanics and Geotechnical Engineering2020，12，2： | 2 |
| 2 | Real-time observation of vortex mode switching in a narrow-linewidth mode-locked fiber laser显示文摘Temporal and spatial resonant modes are always possessed in physical systems with energy oscillation.In ultrafast fiber lasers,enormous progress has been made toward controlling the interactions of many longitudinal modes,which results in temporally mode-locked pulses.Recently,optical vortex beams have been extensively investigated due to their quantized orbital angular momentum,spatially donut-like intensity,and spiral phase front.In this paper,we have demonstrated the first to our knowledge observation of optical vortex mode switching and their corresponding pulse evolution dynamics in a narrow-linewidth mode-locked fiber laser.The spatial mode switching is achieved by incorporating a dual-resonant acousto-optic mode converter in the vortex mode-locked fiber laser.The vortex mode-switching dynamics have four stages,including quiet-down,relaxation oscillation,quasi mode-locking,and energy recovery prior to the stable mode-locking of another vortex mode.The evolution dynamics of the wavelength shifting during the switching process are observed via the time-stretch dispersion Fourier transform method.The spatial mode competition through optical nonlinearity induces energy fluctuation on the time scale of ultrashort pulses,which plays an essential role in the mode-switching dynamic process.The results have great implications in the study of spatial mode-locking mechanisms and ultrashort laser applications. | Jiafeng Lu Fan Shi Linghao Meng Longkun Zhang Linping Teng Zhengqian Luo Peiguang Yan Fufei Pang Xianglong Zeng | 2020 | Photonics Research2020，8，7： | 2 |
| 3 | Long-term effect of chemical fertilizer, straw, and manure on soil chemical and biological properties in northwest China显示文摘 | Enke Liu Changrong Yan Xurong Mei Wenqing He So Hwat Bing Linping Ding Qin Liu Shuang Liu Tinglu Fan | 2010 | Geoderma2010，，3： | 1 |
| 4 | Long-term effect of chemical fertilizer, straw, and manure on soil chemical and biological properties in northwest China显示文摘 | Enke Liu Changrong Yan Xurong Mei Wenqing He So Hwat Bing Linping Ding Qin Liu Shuang Liu Tinglu Fan | 2010 | Geoderma2010，，3： | 1 |
| 5 | Factors associated with dysglycemia and its post-surgical resolution in patients with pheochromocytomas显示文摘Dear Editor,Pheochromocytomas are rare neuroendocrine tumors originating from chromaffin cells in the adrenal medulla(Neumann et al., 2019). A number of case reports and small cohorts have reported the association between dysglycemia and pheochromocytomas(Elenkova et al., 2020;Khatiwada et al., 2020;Krumeich et al., 2021). However, there are few large sample studies reporting the outcomes of dysglycemia in patients with pheochromocytomas after resection. | Lin Zhao Xu Meng Qiongyu Zhang Yi Zhou Ting Zhang Tao Tian Hua Fan Huadong Zhu Yecheng Liu Fang Luo Linping Wang Weixian Yang Xianliang Zhou | 2023 | Science China(Life Sciences)2023，66，2： | 0 |
| 6 | Spatiotemporal variations of ambient air pollutants and meteorological influences over typical urban agglomerations in China during the COVID-19 lockdown显示文摘To investigate the air quality change during the COVID-19 pandemic,we analyzed spatiotemporal variations of six criteria pollutants in nine typical urban agglomerations in China using ground-based data and examined meteorological influences through correlation analysis and backward trajectory analysis under different responses.Concentrations of PM2.5,PM10,NO2,SO2 and CO in urban agglomerations respectively decreased by 18%–45%(30%–62%),17%–53%(22%–39%),47%-64%(14%–41%),9%–34%(0%–53%)and 16%-52%(23%–56%)during Lockdown(Post-lockdown)period relative to Pre-lockdown period.PM2.5 pollution events occurred during Lockdown in Beijing-Tianjin-Hebe(BTH)and Middle and South Liaoning(MSL),and daily O3 concentration rose to gradeⅡstandard in Post-lockdown period.Distinct from the nationwide slump of NO2 during Lockdown period,a rebound(~40%)in Post-lockdown period was observed in Cheng-Yu(CY),Yangtze River Middle-Reach(YRMR),Yangtze River Delta(YRD)and Pearl River Delta(PRD).With slightly higher wind speed compared with 2019,the reduction of PM2.5(51%–62%)in Post-lockdown period is more than2019(15%–46%)in HC(Harbin-Changchun),MSL,BTH,CP(Central Plain)and SP(ShandongPeninsula),suggesting lockdown measures are effective to PM2.5 alleviation.Although O3 concentrations generally increased during the lockdown,its increment rate declined compared with 2019 under similar sunlight duration and temperature.Additionally,unlike HC,MSL and BTH,which suffered from additional(>30%)air masses from surrounding areas after the lockdown,the polluted air masses reaching YRD and PRD mostly originated from the long-distance transport,highlighting the importance of joint regional governance. | Linping Fan Shuang Fu Xin Wang Qingyan Fu Haohao Jia Hao Xu Guimei Qin Xue Hu Jinping Cheng | 2021 | Journal of Environmental Sciences2021，33，8： | 0 |
| 7 | Effects of electrostimulation and administration of succinylcholine on the expression of Fos protein in mesencephalic periaqueductal gray matter of rats after simulated weightlessness显示文摘BACKGROUND: Expression of Fos in neurons of periaqueductal gray (PAG) is used to reflect the excitability. However, changes of expression of Fos in neurons of PAG are caused by injured electrostimulation after simulated weightlessness, and the relationship between pretreatment and injection of succinylcholine has not been determined yet. OBJECTIVE: To investigate the changes of expression of Fos in PAG induced by injured electrostimulation, pretreatment and injection of succinylcholine at 2 weeks after simulated weightlessness. DESIGN: Observational and controlled animal study. SETTING: Department of Physiology, Medical School, Xi’an Jiaotong University; Key Laboratory of Environment and Genes Related to Diseases, Ministry of Education. MATERIALS: A total of 24 adult female SD rats, of clean grade and weighing 180-220 g, were selected in this study. METHODS: The experiment was completed in the Experimental Animal Center of Xi’an Jiaotong University. ① All rats were randomly divided into 2 groups according to body mass: simulated weightlessness group and control group with 12 in each group. And then, each group was also divided into 3 subgroups: electrostimulation group, succinylcholine-pretreatment group and succinylcholine-injection group with 4 in each subgroup. ② The model of weightlessness was simulated by tail-suspended female rats, which were described and modified by Cheng Jie. Rats in normal control group were given the same interventions as simulated weightlessness group except for tail-suspended. ③ Experimental method: The rats in electrostimulation group were given nociceptive stimulus by a pair of subcutaneous electrodes inserted into 1 and 5 claw of left hindlimb. The stimulus (current: 10 mA; duration: 1 ms; interval: 1 s) lasted for 30 minutes. The rats in succinylcholine-pretreatment group received stimulus after intravenous administration of succinylcholine, rats in succinylcholine-injection group were not given stimulus, just received succinylcholine. ④ All rats were perfused and fixed after 2 hours from the end of stimulation. The brains were removed, and serial frozen sections of midbrain were stained using immunocytochemical method, observed and taken photos under light-microscope. The number and morphological characters of Fos-immunoreactive (Fos-IR) neurons in ventrolateral part of PAG were investigated. MAIN OUTCOME MEASURES: The alterations in number and morphological characters of Fos-IR neurons in ventrolateral PAG of all rats. RESULTS: A total of 24 rats were involved in the final analysis. ① The morphological changes of Fos-IR neurons: The expressions of Fos in ventrolateral part of PAG were observed in both control and simulated weightlessness groups rats after being given nociceptive stimulus. As compared with control group, Fos-IR neurons in simulated weightlessness group were dyed lightly, cellular integrity was impaired, and cellular verge was unclear. ② The numbers of Fos-IR neurons: In control group, the numbers of Fos-IR neurons in ventrolateral part of PAG in simulated weightlessness group were obviously lower than succinylcholine-pretreatment group, but obviously higher than succinylcholine-injection group (46.94±3.38, 71.06±8.96 and 35.04±4.62, respectively, P < 0.05). In 14-day simulated weightlessness group, the numbers of Fos-IR neurons in electrostimulation group were also obviously lower than succinylcholine-pretreatment group, and obviously higher than succinylcholine-injection group (27.77±3.27, 32.91±2.99 and 11.75±1.00, respectively, P < 0.05). The numbers of Fos-IR neurons in all subgroups in control group were obviously higher than those subgroups in simulated weightlessness group. Compared with electrostimulation group, the percentage of expression of Fos in ventrolateral part of PAG responsed to nociceptive stimulus after administration of succinylcholine (SCH) was increased to 51.83% in control group and 18.51% in simulated weightlessness group. CONCLUSION: ① The expression of Fos in neurons in ventrolateral part of PAG were increased by the pretreatment of SCH before nociceptive stimulus. ② Nociceptive stimulus could increase the expression of Fos in neurons in ventrolateral part of PAG. ③ The numbers of Fos-IR neurons in ventrolateral part of PAG were decreased obviously after 2-week simulated weightlessness. | Yongjin Zhu Sudi Wu Xiaoli Fan Xinai Song Linping Xu | 2006 | Neural Regeneration Research2006，1，1： | 0 |
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