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The Spin Measurement of MAXI J0637-430:a Black Hole Candidate with High Disk Density

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Research in Astronomy and Astrophysics 2023年第7期23卷 277-287页

作者： Nan Jia Ye Feng yu-Jia Song jun Yang Jieun yuh pei-jun Huang Li-jun Gou Key Laboratory for Computational Astrophysics National Astronomical ObservatoriesChinese Academy of SciencesBeijing 100101China School of Astronomy and Space Sciences University of Chinese Academy of SciencesBeijing 100049China Shanghai American School Puxi Campus Shanghai 201107China Shenzhen Yaohua Experimental School Shenzhen 518034China

The Galactic black hole candidate MAXI J0637-430 was first discovered by MAXI/GSC on 2019 November *** study the spectral properties of MAXI J0637-430 by using the archived NuSTAR data and Swift/XRT *** fitting the eight spectra by using a disk component and a powerlaw component model with absorption,we select the spectra with relatively strong reflection components for detailed X-ray reflection *** the most state-of-art reflection model,relxillCp,the spectral fitting measures a black hole spin a_(*)>0.72 and the inclination angle of the accretion disk i=46.1_(-5.3)^(+4.0)degrees,at a 90%confidence *** addition,the fitting results show an extreme supersolar iron *** with the fitting results of reflection model reflionx_hd,we consider that this unphysical iron abundance may be caused by a very high-density accretion disk(n_(e)>2.34×10^(21)cm^(-3))or a strong Fe K_(α) emission *** soft excess is found in the soft state spectral fitting results,which may be an extra free-free heating effect caused by high density of the accretion ***,we discuss the robustness of black hole spin obtained by X-ray reflection *** result of relatively high spin is self-consistent with broadened Fe K_(α) *** abundance and disk density have no effect on the spin results.

关键词： black hole physics X-rays:binaries accretion accretion disks

Temperature-Dependent SRS Behavior of 316L and Its Constitutive Model

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Acta Metallurgica Sinica(English Letters) 2018年第3期31卷 234-244页

作者： Jian Peng Jian Peng Kai-Shang Li jun-Feng pei Chang-yu Zhou School of Mechanical Engineering Changzhou UniversityChangzhou 213164 China Jiangsu Key Laboratory of Green Process Equipment Changzhou University Changzhou 213164 China School of Mechanical and Power Engineering Nanjing TechUniversity Nanjing 210009 China

The strain rate sensitivity（SRS）and temperature sensitivity（TS）of 316L austenitic stainless steel were investigated by constant strain rate test（CSRT）and strain rate jump test（SRJT）under four temperatures（293,373,473 and 573 K）and four strain rates（5 ×10^-4/s,1 × 10^-3/s,5 × 10^-3/s and 1 × 10^-2/s）.The results show that temperature sensitivity（TS）indexes at different strain rates are coincidence to be negative,related to temperature *** the contrary,SRS indexes change from positive to negative with the increase in temperature associated with dynamic strain aging（DSA）.Moreover,based on the comparison between CSRT and SRJT,SRS and TS indexes obtained by two methods agree *** proves that the SRJT can describe the SRS and TS phenomenon of 316L ***,the effects of tem-perature and strain rate on fracture mechanism were *** last,an improved Johnson-Cook model was proposed to consider the temperature-dependent SRS behavior of 316L.

关键词： Strain rate sensitivity Strain rate jump test Improved Johnson-Cook model

Effects of Glucose Addition on N Transformations in Paddy Soils with a Gradient of Organic C Content in Subtropical China

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Agricultural Sciences in China 2010年第9期9卷 1309-1316页

作者： JIA jun-xian LI Zhong-pei LIU Ming CHE yu-ping State Key Laboratory of Soil and Sustainable Agriculture Institute of Soil Science Chinese Academy of Sciences Nanjing 210008 P.R. China Graduate University Chinese Academy of Sciences Beijing 100049 P.R.China College of Art and Science Shanxi Agricultural University Taigu 030801 P.R. China

To better understand the interaction of N transformation and exogenous C source and manage N fertilization, the effects of glucose addition on N transformation were determined in paddy soils with a gradient of soil organic C content. Changes in N mineralization, nitrification and denitrification, as well as their response to glucose addition were measured by incubation experiments in paddy soils derived from Quaternary red clay in subtropical China. Mineralization and denitrification were changed in order of increasing soil fertilities： high 〉 middle 〉 low. During the first week of incubation, net N mineralization and denitrification rates in paddy soil with high fertility were 1.9 and 1.1 times of those in soil with middle fertility and 5.3 and 2.9 times of those in soil with low fertility, respectively. Addition of glucose decreased net N mineralization by approximately 78.8, 109.2 and 177.4% in soils with high, middle and low fertility, respectively. However, denitrification rates in soils with middle and low fertility were increased by 14.4 and 166.2% respectively. The highest nitrate content among the paddy soils tested was 0.62 mg kg-1 and the highest nitrification ratio was 0.33%. Addition of glucose had no obvious effects on nitrate content and nitrification ratio. It was suggested that the intensity of mineralization and denitrification was quite different in soils with different fertility, and increased with increasing soil organic C content. Addition of glucose decreased mineralization, but increased denitrification, and the shifts were greater in soil with low than in soil with high organic C content. Neither addition of glucose nor inherent soil organic C had obvious effects on nitrification in paddy soils tested.

关键词： paddy soils of subtropical China soil fertility glucose addition nitrogen transformation

Accuracy evaluation of a new three-dimensional reproduction method of edentulous dental casts, and wax occlusion rims with jaw relation

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International Journal of Oral Science 2013年第3期5卷 155-161页

作者： Fu-Song yuan yu-Chun Sun Yong Wang pei-jun L Center of Digital Dentistry Peking University School and Hospital of Stomatology & National Engineering Laboratory for Digital and Material Technology of Stomatology & Research Center of Engineering and Technology for Digital Dentistry Ministry of Health

The article introduces a new method for three-dimensional reproduction of edentulous dental casts,and wax occlusion rims with jaw relation by using a commercial high-speed line laser scanner and reverse engineering software and evaluates the method’s accuracy in *** method comprises three main steps：（i）acquisition of the three-dimensional stereolithography data of maxillary and mandibular edentulous dental casts and wax occlusion rims;（ii）acquisition of the three-dimensional stereolithography data of jaw relations;and（iii）registration of these data with the reverse engineering software and completing *** evaluate the accuracy of this method,dental casts and wax occlusion rims of 10 edentulous patients were *** lengths of eight lines between common anatomic landmarks were measured directly on the casts and occlusion rims by using a vernier caliper and on the three-dimensional computerized images by using the software measurement *** direct data were considered as the true *** paired-samples t-test was used for statistical *** mean differences between the direct and the computerized measurements were mostly less than 0.04 mm and were not significant（P.0.05）.Statistical significance among 10 patients was assessed using one-way analysis of variance（P,0.05）.The result showed that the 10 patients were considered statistically no ***,accurate three-dimensional reproduction of the edentulous dental casts,wax occlusion rims,and jaw relations was *** proposed method enables the visualization of occlusion from different views and would help to meet the demand for the computer-aided design of removable complete dentures.

关键词： accuracy computer-aided design/computer-aided manufacturing complete denture jaw relation line laser scanner reverse engi neeri ng software

Experimental study on simultaneous desulfurization and denitrifi- cation based on highly active absorbent

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Journal of Environmental Sciences 2006年第2期18卷 281-286页

作者： ZHAO Yi XU pei-yao FU Dong HUANG Jian-jun yu Huan-huan School of Environmental Science and Engineering North China Electric Power University Baoding 071003 China

Simultaneous removal of SO2 and NO from flue gas by the highly active absorbent prepared from fly ash, lime and a few oxidizing manganese compound additive was studied using a flue gas circulating fluidized bed （CFB） under different experimental conditions. The effects influencing the removal effiencies were discussed. The optimal flue gas temperature, flue gas humidity, gas velocity of CFB and Ca/（S＋N） molar ratio with this process were approximately 110℃, 6%, 1.8 m/s and 1.05, respectively. Removal efficiencies of 92.3% for SO2 and 60.88% for NO were obtained under the optimal experimental conditions. While the spent absorbent appeared in the form of dry powder, the mechanism of removal for SO2 and NO based on the highly active absorbent was investigated by a scanning electron microscope （SEM）, a X-ray energy spectrometer and the chemical analysis methods. The valuable references can be provided for industrial application by the process. The foreground of application will be vast in China and in the world.

关键词： simultaneous desulfurization and denitrifieation CFB removal efficiency mechanism

Functional analysis of the circadian clock gene timeless in Tribolium castaneum

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Insect Science 2018年第3期25卷 418-428页

作者： Cheng-jun Li Xiao-pei yun Xiao-Juan yu Bin Li Jiangsu Key Laboratory for Biodiversity and Biotechnology College of Life Sciences Nanjing Normal University Nanjing China Institute of Life Sciences School of Food and Biological Engineering Jiangsu University Zhenjiang Jiangsu Province China

Circadian rhythms are endogenous oscillations with a period of about 24 h driven by a circadian clock. So far, variable oscillators have been found in insects. To explore the circadian clock of Tribolium castaneum, we cloned the clock gene timeless （Tctimeless）. Its open reading frame is 3240 bp in length and consists of 10 exons. Tctimeless＇ is highly expressed in the late pupal stage. Tissue-specific expression analysis in late adult stages revealed high expression of Tctimeless in the head, epidermis, fat body and accessory glands. Silencing of Tctimeless by RNA interference （RNAi） at the late larval stages caused a failure to initiate eclosion. Tctimeless knockdown in late pupal stages led to a gender-independent decline in egg production and progeny survival. As a core clock gene, Tctimeless exhibited one expression peak in the middle of the circadian day. Knockdown of Tctimeless disrupted daily expression patterns of Tccycle, Tcclock, Tcperiod and itself, while Tctimeless and Tcperiod expression patterns over the circadian day were also perturbed when Tccycle or Tcclock is suppressed by RNAi. This study identified a complex transcriptional relationship among circadian clock genes in T. castaneum.

关键词： circadian rhythms clock cycle eclosion reproduction timeless

Experimental Study on Sloshing Characteristics in the Elastic Tank Based on Morlet Wavelet Transform

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China Ocean Engineering 2018年第4期32卷 400-412页

作者： JIANG Mei-rong ZHONG Wen-jun yu Jian-xing LIU pei-lin YIN Han-jun WANG Shou-dong MA yu-xiang State Key Laboratory of Hydraulic Engineering Simulation and Safety Tianjin UniversityTianjin 300072China Offshore Oil Engineering Co. Ltd.CNOOCTianjin 300451China CNOOC Research Institute Co. Ltd.CNOOCBeijing 100028China Transport Planning and Research Institute Ministry of TransportBeijing 100028China State Key Laboratory of Coastal and Offshore Engineering Dalian University of TechnologyDalian 116024China

Hydroelastic effect of sloshing is studied through an experimental investigation. Different excitation frequencies are considered with low-fill-depth and large amplitude. Morlet wavelet transform is introduced to analyze the free surface elevations and sloshing pressures. It focuses on variations and distributions of the wavelet energy in elastic tanks. The evolutions of theoretical and experimental wavelet spectra are discussed and the corresponding Fourier spectrums are compared. Afterwards, average values of the wavelet spectra are extracted to do a quantitative study at various points. From the wavelet analysis, sloshing energies are mainly distributed around the external excitation frequency and expanded to high frequencies under violent condition. In resonance, experimental wavelet energy of the elevation in elastic tanks is obviously less than that in the rigid one; for sloshing pressures, the elastic wavelet energy close to the rigid one and conspicuous impulse is observed. It recommends engineers to concern the primary natural frequency and impulsive peak pressures.

关键词： sloshing elastic tank wavelet transform free surface elevation pressure

Band gaps of elastic waves in 1-D phononic crystals with imperfect interfaces

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International Journal of Minerals,Metallurgy and Materials 2009年第5期16卷 608-614页

作者： Min Zheng pei-jun Wei School of Applied Science University of Science and Technology Beijing Beijing 100083 China

Band gaps of elastic waves in 1-D phononic crystals with imperfect interfaces were studied. By using the transfer matrix method （TMM） and the Bloch wave theory in the periodic structure, the dispersion equation was derived for the periodically lami- nated binary system with imperfect interfaces （the traction vector jumps or the displacement vector jumps）. The dispersion equation was solved numerically and wave band gaps were obtained in the Brillouin zone. Band gaps in the case of imperfect interfaces were compared with that in the case of perfect interfaces. The influence of imperfect interfaces on wave band gaps and some interesting phenomena were discussed.

关键词： phononic crystal transfer matrix band gap imperfect interface Bloch wave

Mechanism of action of Linggui Zhugan Decoction in treating non-alcoholic fatty liver disease using untargeted metabolomics approach

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Traditional Medicine Research 2025年第2期10卷 65-76页

作者： Huan pei Ren-Lin Li Xin-Ran Song Qian-Qian Wan yu-Ming Wang Han-Zhou Li Wei-Quan Xu Jia-Bao Liao Wei-Bo Wen Jing Miao Huan-Tian Cui School of Basic Medicine Yunnan University of Chinese MedicineKunming 650599China School Clinical Medical College Yunnan University of Chinese MedicineKunming 650599China First School of Clinical Medicine Yunnan University of Chinese MedicineKunming 650599China School of Integrative Chinese and Western Medicine Tianjin University of Traditional Chinese MedicineTianjin 301617China Department of Pharmacy Tianjin Second People's HospitalTianjin 300192China

Background:Non-alcoholic fatty liver disease(NAFLD)is a liver disorder characterized by the accumulation and degeneration of fat in the liver cells,a condition that may further deteriorate and lead to cirrhosis and liver *** studies showed that metabolic dysfunction can promote NAFLD *** Zhugan Decoction(LGZGD)has therapeutic effects on *** mechanism of LGZGD still remains *** study was to examine the impact of LGZGD on the metabolic processes involved in the development of ***:A mice model of NAFLD was treated with *** therapeutic potential of LGZGD was evaluated by assessing the activity of transaminases,lipids levels of blood,and pathological changes in the liver of the mice model of ***,this study also evaluated the influence of LGZGD on liver inflammation and oxidative ***:The results of untargeted metabolomics analysis showed that LGZGD reduced the disordered lipid metabolism in NAFLD *** improved the oxidative stress and also reduced the levels of pro-inflammatory cytokines in the *** metabolomics analysis of liver samples revealed that LGZGD treatment improved metabolic disorders,including alanine,aspartate,glutamate,glycerophospholipid metabolism,and citrate *** RT-qPCR and Western blot results showed that LGZGD could regulate the expression of key enzymes in the metabolic pathway of the citrate cycle,including ATP-citrate lyase(ACLY),alanine-glyoxylate aminotransferase-2(AGXT2),phosphatidylethanolamine N-methyltransferase(PEMT),and succinate dehydrogenase(SDH).Conclusion:We found that LGZGD can treat NAFLD by reducing inflammatory responses,inhibiting oxidative stress,regulating alanine,aspartate,glutamate,and glycerophospholipid metabolism,and citrate cycle pathways.

关键词： NAFLD LGZGD untargeted metabolomics glycerophospholipid metabolism citrate cycle