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Correction to Hawking Radiation Characteristics of Stationary Demianski-Newman Black Hole

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Communications in Theoretical Physics 2006年第6期45卷 1026-1030页

作者： jiang Qing-quan YANG Shu-Zheng Institute of Theoretical Physics China West Normal University Nanchong 637002 China

The pure thermal spectrum in dragging coordinate system and the tunneling radiation characteristics across the event horizon for stationary Demianski-Newman black hole are researched. The result shows that the tunneling rate of the particle is relevant to Bekenstein-Hawking entropy, and the derived radiate spectrum is not strictly pure thermal, but is consistent with underlying unitary theory. Finally, we use the obtained results to reduce to stationary Kerr black hole and static Schwarzschild black hole, and lind that only when ignoring the spectrum at higher energies is the tunneling radiation spectrum consistent with Hawking pure thermal one.

关键词： Demianski-Newman black hole energy conservation angular momentum conservation tunneling rate Bekenstein-Hawking entropy

Unique method for removal of knotted lumbar epidural catheter: A case report

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World Journal of Clinical Cases 2024年第10期12卷 1824-1829页

作者： nian-Hua Deng Xiao-Cong Chen Shou-Bo quan Anesthesia and Surgery Center Dongguan Songshan Lake Central HospitalDongguan 523326Guangdong ProvinceChina

BACKGROUND Combined spinal-epidural(CSE)anesthesia is the preferred anesthesia method for cesarean *** use of an epidural catheter is essential for administering additional drugs intraoperatively and managing postoperative ***,the insertion of epidural catheters is associated with various complications,such as total spinal anesthesia,symptoms indicative of spinal nerve root irritation,and challenges in epidural catheter *** SUMMARY We present a case report of a challenging epidural catheter removal due to *** lumbar computed tomography scan results revealed that the catheter formed a tight knot in the epidural *** used a novel extubation method and successfully removed the *** The operator can use opposite forces to"spiral"apart the spinal joints by positioning the patient's body in a specific *** findings indicate that,when combined with imaging examination results,this method is effective for the removal of epidural catheters.

关键词： Epidural catheter Knotting Challenging extubation Case report

Spatio-temporal measurements of overshoot phenomenon in pulsed inductively coupled discharge

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Chinese Physics B 2021年第4期30卷 369-375页

作者： Xiang-Yun Lv Fei Gao quan-Zhi Zhang You-nian Wang Key Laboratory of Materials Modification by Laser Ionand Electron Beams(Ministry of Education)School of PhysicsDalian University of TechnologyDalian 116024China

Pulse inductively coupled plasma has been widely used in the microelectronics industry,but the existence of overshoot phenomenon may affect the uniformity of plasma and generate high-energy ions,which could damage the *** overshoot phenomenon at various spatial locations in pulsed inductively coupled Ar and Ar/CF_(4) discharges is studied in this *** electron density,effective electron temperature,relative light intensity,and electron energy probability function(EEPF) are measured by using a time-resolved Langmuir probe and an optical probe,as a function of axial and radial *** the initial stage of pulse,both electron density and relative light intensity exhibit overshoot phenomenon,i.e.,they first increase to a peak value and then decrease to a convergent *** overshoot phenomenon gradually decays,when the probe moves away from the ***,a delay appears in the variation of the electron densities,and the effective electron temperature decreases,which may be related to the reduced strength of electric field at a distance,and the consequent fewer high-energy electrons,inducing limited ionization and excitation *** overshoot phenomenon gradually disappears and the electron density decreases,when the probe moves away from reactor *** Ar/CF_(4) discharge,the overshoot phenomenon of electron density is weaker than that in the Ar discharge,and the plasma reaches a steady density within a much shorter time,which is probably due to the more ionization channels and lower ionization thresholds in the Ar/CF_(4) plasma.

关键词： pulse inductively coupled plasma overshoot spatial distribution

V551 Aur,an oEA binary with g-mode pulsations?

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Research in Astronomy and Astrophysics 2012年第6期12卷 671-677页

作者： nian Liu Xiao-Bin Zhang An-Bin Ren Li-Cai Deng Zhi-quan Luo Institute of Theoretical Physics China West Normal University Nanchong 637002 China National Astronomical Observatories Chinese Academy of Sciences Beijing 100012 China

We present time-series CCD photometry of V551 Aur, an eclipsing binary located in the open cluster NGC 2126 that shows δ Scuti-like pulsations. Complete covered light curves in theBand V bands were obtained with high-precision over nine nights. Based on them, a revised orbital period and the first photometric solutions were determined. Our eclipsing light-curve synthesis reveals a detached configura- tion for the binary system with a mass-ratio of about 0.73, and the mean density of the pulsating primary component was deduced to be about （0.532±0.005）ρ. A fre- quency analysis of the eclipse-subtracted light curve yields two reliable frequencies at f1=7.727013（c/d） and f2=15.45403（c/d）, respectively. With the help of the derived mean density, mode identification was performed. The result suggests that the primary component of V551 Aur is very probably g-mode oscillations.

关键词： stars: binaries: eclipsing -- stars: oscillations -- stars: individual (V551Aur) -- open cluster: individual (NGC 2126)

Tribological evaluation of environmentally friendly ionic liquids derived from renewable biomaterials

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Friction 2018年第2期6卷 208-218页

作者： Cheng jiang Weimin LI Jingyan nian Wenjing LOU Xiaobo WANG State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical Physics Chinese Academy of Sciences Qingdao Center of Resource Chemistry & New Materials

Unlike most of the conventional ionic liquids(ILs) derived from non-renewable resources, five environmentally friendly ILs([Ch][AA] ILs) derived from amino acids(AAs) and choline(Ch) were synthesized using biomaterials by a simple, green route: acid–base reaction of Ch and AAs. The thermal and corrosion properties, as well as viscosity, of the prepared ILs were examined. The results revealed that the anion structure of ILs plays a dominant role in their thermal and viscosity behavior. These ILs exhibited less corrosion toward copper, related to their halogen-, sulfur-, and phosphorus-free characteristics. The tribological behavior of the synthesized ILs was examined using a Schwingungs Reibung und Verschleiss tester, and the results indicated that these ILs exhibit good friction-reducing and anti-wear properties as lubricants for steel/steel contact. Results from energy-dispersive spectroscopy and X-ray photoelectron spectroscopy indicated that the good tribological properties of [Ch][AA] ILs are related to the formation of a physically adsorbed film on the metal surface during friction.

关键词： choline amino acids ionic liquids lubricant tribological behavior environmentally friendly

Demonstration of Inverse Scattering Transform for DNLS Equation

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Communications in Theoretical Physics 2007年第2X期48卷 299-303页

作者： YANG Chun-Nuan YU Jia-Lu WANG Qu-quan HUANG nian-Ning Department of Physics Wuhan University Wuhan 430072 China

Since the Jost solutions of the DNLS equation does not tend to the free Jost solutioins as ｜λ｜→∞, the usual inverse scattering transform （IST） must be revised. Beside the Kaup and Newell＇s approach, we propose a simple revision in constructing the equations of IST, where the usual Zakharov-Shabat kern is revised by multiplying λ^-2 or λ^-1. To justify the revision we show that the Jost solutions obtained do satisfy the pair of compatibility equations.

关键词： inverse scattering transform soliton solutions Liouville theorem

Reliability analysis of slopes considering spatial variability of soil properties based on efficiently identified representative slip surfaces

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Journal of Rock Mechanics and Geotechnical Engineering 2020年第3期12卷 642-655页

作者： Bin Wang Leilei Liu Yuehua Li quan jiang State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan430071China University of Chinese Academy of Sciences Beijing100049China Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring Ministry of EducationSchool of Geosciences and Info-PhysicsCentral South UniversityChangsha410083China Hunan Key Laboratory of Nonferrous Resources and Geological Hazards Exploration Changsha410083China School of Geosciences and Info-Physics Central South UniversityChangsha410083China

Slope reliability analysis considering inherent spatial variability(ISV)of soil properties is timeconsuming when response surface method(RSM)is used,because of the"curse of dimensionality".This paper proposes an effective method for identification of representative slip surfaces(RSSs)of slopes with spatially varied soils within the framework of limit equilibrium method(LEM),which utilizes an adaptive K-means clustering ***,an improved slope reliability analysis based on the RSSs and RSM considering soil spatial variability,in perspective of computation efficiency,is *** detailed implementation procedure of the proposed method is well documented,and the ability of the method in identifying RSSs and estimating reliability is investigated via three slope *** show that the proposed method can automatically identify the RSSs of slope with only one evaluation of the conventional deterministic slope stability *** RSSs are invariant with the statistics of soil properties,which allows parametric studies that are often required in slope reliability analysis to be efficiently achieved with *** is also found that the proposed method provides comparable values of factor of safety(FS)and probability of failure(Pf)of slopes with those obtained from direct analysis and lite rature.

关键词： Slope reliability analysis Spatial variability Representative slip surfaces(RSSs) Response surface method(RSM) Random field simulation

Theoretical verification of the rationality of strain energy storage index as rockburst criterion based on linear energy storage law

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Journal of Rock Mechanics and Geotechnical Engineering 2022年第6期14卷 1737-1746页

作者： Fengqiang Gong Song Luo quan jiang Lei Xu Engineering Research Center of Safety and Protection of Explosion and Impact of Ministry of Education(ERCSPEIME) Southeast UniversityNanjing211189China School of Civil Engineering Southeast UniversityNanjing211189China School of Resources and Safety Engineering Central South UniversityChangsha410083China State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan430071China

The rationality of using strain energy storage index(Wet)for evaluating rockburst proneness was theoretically verified based on linear energy storage(LES)law in this *** LES law is defined as the linear relationship between the elastic strain energy stored inside the solid material and the input strain energy during *** is used to determine the elastic strain energy and dissipated strain energy of rock specimens at various loading/unloading stress *** results showed that the Wetvalue obtained from experiments was close to the corresponding theoretical one from the LES ***,with an increase in the loading/unloading stress level,the ratio of elastic strain energy to dissipated strain energy converged to the peak-strength strain energy storage index(Wp et).This index is stable and can better reflect the relative magnitudes of the stored energy and the dissipated energy of rocks at the whole pre-peak stage than the strain energy storage *** peak-strength strain energy storage index can replace the conventional strain energy storage index as a new index for evaluating rockburst proneness.

关键词： Rockburst criterion Strain energy storage index Linear energy storage(LES)law Peak-strength strain energy storage index

Influence of Er_2O_3 content on microstructure and mechanical properties of ZTA-TiO_2 composites

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Journal of Rare Earths 2019年第3期37卷 299-304页

作者： Yudong Sui Li'na Han Yehua jiang quan Shan School of Materials Science and Engineering Kunming University of Science and Technology

The influence of Er_2 O_3 addition on the phase evolution and mechanical properties of sintered(1600 ℃,4 h) ZTA(yttria stabilized zirconia toughened alumina)-TiO_2 composites was investigated. The SEM and XRD results reveal the formation of a new erbium zirconium oxide,Zr_3 Er_4 O_(12),with a granulate morphology when Er_2 O_3 content is higher than 1 wt%. The grain sizes of both Al_2 O_3 and yttria-stabilized zirconia phases decrease with an increase in the Er_2 O_3 content. The relative density, Vickers hardness and fracture toughness of the composites are found to be strongly dependent on their grain sizes, relative densities and the formation of the Zr_3 Er_4 O_(12) secondary phases. The composite with 5 wt% Er_2 O_3 shows the highest relative density(99.93%), Vickers hardness(1752 HV) and fracture toughness(7.92 MPa·m^(1/2)).

关键词： Er2O3 Microstructure Vickers hardness Fracture toughness ZTA-TiO2 ceramic composite Rare earths