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Carrier transport characteristics of H-terminated diamond films prepared using molecular hydrogen and atomic hydrogen

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International Journal of Minerals,Metallurgy and Materials 2017年第7期24卷 850-856页

作者： jin-long Liu liang-xian Chen Yu-ting Zheng jing-jing Wang Zhi-hong Feng Cheng-ming Li Institute for Advanced Materials and Technology University of Science and Technology Beijing Science and Technology on ASIC Laboratory Hebei Semiconductor Research Institute

The H-terminated diamond films, which exhibit high surface conductivity, have been used in high-frequency and high-power electronic devices. In this paper, the surface conductive channel on specimens from the same diamond film was obtained by hydrogen plasma treatment and by heating under a hydrogen atmosphere, respectively, and the surface carrier transport characteristics of both samples were compared and evaluated. The results show that the carrier mobility and carrier density of the sample treated by hydrogen plasma are 15 cm^2·V^（-1）·s^（-1） and greater than 5 × 1012 cm^（-2）, respectively, and that the carrier mobilities measured at five different areas are similar. Compared to the hydrogen-plasma-treated specimen, the thermally hydrogenated specimen exhibits a lower surface conductivity, a carrier density one order of magnitude lower, and a carrier mobility that varies from 2 to 33 cm^2·V^（-1）·s^（-1）. The activated hydrogen atoms restructure the diamond surface, remove the scratches, and passivate the surface states via the etching effect during the hydrogen plasma treatment process, which maintains a higher carrier density and a more stable carrier mobility.

关键词： H-termination diamond film surface conductivity carrier mobility plasma treatment

Is TOL 1326–379 a Prototype ofγ-Ray Emitting FR0 Radio Galaxy?

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Research in Astronomy and Astrophysics 2022年第3期22卷 47-56页

作者： Wen-jing Fu Hai-Ming Zhang jin Zhang Yun-Feng liang Su Yao En-Wei liang Guangxi Key Laboratory for Relativistic Astrophysics School of Physical Science and TechnologyGuangxi UniversityNanning 530004China School of Astronomy and Space Science Nanjing UniversityNanjing 210023China School of Physics Beijing Institute of TechnologyBeijing 100081China Max-Planck-Institute für Radioastronomie Auf dem Hügel 69D-53121 BonnGermany

With the possible spacial association to the Fermi/LAT source 3 FGL J 1330.0-3818,TOL 1326-379 may be the first one that is identified as a 7-ray emitting Fanaroff-Riley type 0 radio galaxy(FRO RG).We analyze the~12 yr Fermi/LAT observation data of thisγ-ray source and examine its association to TOL *** show that theγ-ray source(named as J1331.0-3818)is tentatively detected with a TS value of 28.7,3 FGL J 1330.0-3818 is out of the 95%containment of J1331.0-3818,and their positions are spatially separated~0°.2.4 FGL J1331.3-3818 falls into the 68%containment of J1331.0-3818,suggesting that our result agrees with that reported in the Fourth Fermi LAT Source *** 1326-379 is out of the 95%containment of J1331.0-3818,and their positions are spatially separated~0°.4,indicating that the association between J1331.0-3818 and TOL 1326-379 is quite ***,we do not find other possible potential radio or X-ray counterpart within the circle centered at J1331.0-3818 with a radius of 0°.*** spectral energy distribution(SED)of TOL 1326-379 shows a bimodal feature as seen in theγ-ray emitting *** fit the SED with the one-zone leptonic model and find that the average energy spectrum of J1331.0-3818 agrees with the model *** that J1331.0-3818 is an unidentified 7-ray source,we derive the upper-limit of theγ-ray flux for TOL *** is not tight enough to exclude this possibility with the SED *** on these results,we cautiously argue that theγ-ray source J1331.0-3818 is associated with TOL 1326-379 and its jet radiation physic is similar to thoseγ-ray emitting RGs.

关键词： radiation mechanisms:non-thermal galaxies:active galaxies galaxies:radio jets gamma-rays:galaxies

Colorful liquid metal printed electronics

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Science China(Technological Sciences) 2018年第1期61卷 110-116页

作者： liang ShuTing LIU jing Department of Biomedical Engineering School of Medicine Tsinghua University Beijing Key Laboratory of CryoBiomedical Engineering and Key Laboratory of Cryogenics Technical Institute of Physics and ChemistryChinese Academy of Sciences

Liquid metal based printed electronics was a newly emerging frontier in recent years. However, restricted by the single silver-white appearance of the liquid metal （LM）, the colors of currently available printed electronics were rather limited. Here, a new conceptual LM based colorful printed electronics was proposed where electrical wires and circuits with numerous colors can be made via a straightforward, efficient and accurate printing procedure. Firstly, the LM was printed on the substrate to construct a conductive wire. Then it was frozen to a solid. Subsequently, colorful pigments were coated on the originally printed liquid metal conductive wires, which finally were packaged with PDMS. Such multicolored conductive wire exhibits excellent conductivity, and good temperature resistance （do not fade at high temperature）. Further, the adhesion mechanism of the mineral pigments on the liquid metal layer was disclosed. And the pigment layer was discovered to well protect the LM from the outside environments, and enhance the durability of the LM conductive wire at the same time. These multicolored liquid metal wires take an aesthetic appearance, excellent printability, flexibility, large conductivity and stable performance, which would significantly enhance the sense of beanty and experience when compared to the conventional printed electronics.

关键词： liquid metal printed electronics multicolor functional device

Ohmic contact properties of p-type surface conductive layer on H-terminated diamond films prepared by DC arc jet CVD

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International Journal of Minerals,Metallurgy and Materials 2013年第8期20卷 802-807页

作者： jin-long Liu Cheng-ming Li Rui-hua Zhu liang-xian Chen jing-jing Wang Zhi-hong Feng School of Materials Science and Engineering University of Science and Technology Beijing Science and Technology on ASIC Laboratory Hebei Semiconductor Research Institute

With the advantages of high deposition rate and large deposition area, polycrystalline diamond films prepared by direct current （DC） arc jet chemical vapor deposition （CVD） are considered to be one of the most promising materials for high-frequency and high-power electronic devices. In this paper, high-quality self-standing polycrystalline diamond films with the diameter of 100 mm were prepared by DC arc jet CVD, and then, the p-type surface conductive layer with the sheet carrier density of 10^11-10^13 cm-2 on the H-terminated diamond film was obtained by micro-wave hydrogen plasma treatment for 40 min. Ti/Au and Au films were deposited on the H-terminated diamond surface as the ohmic contact electrode, respectively, afterwards, they were treated by rapid vacuum annealing at different temperatures. The properties of these two types of ohmic contacts were investigated by measuring the specific contact resistance using the transmission line method （TLM）. Due to the formation of Ti-related carbide at high temperature, the specific contact resistance of Ti/Au contact gradually decreases to 9.95 × 10^-5 Ω-cm2 as the temperature increases to 820℃. However, when the annealing temperature reaches 850℃, the ohmic contact for Ti/Au is degraded significantly due to the strong diffusion and reaction between Ti and Au. As for the as-deposited Au contact, it shows an ohmic contact. After annealing treatment at 550℃, low specific contact resistance was detected for Au contact, which is derived from the enhancement of interdiffusion between Au and diamond films.

关键词： polycrystalline materials diamond films chemical vapor deposition ohmic contacts contact resistance

Numerical study of creep effect on purging plug performance under cyclic service

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Journal of Iron and Steel Research International 2022年第7期29卷 1119-1128页

作者： Fang-guan Tan Sheng-li jin Zhu He Xiong liang Ya-wei Li jing Li The State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and TechnologyWuhan 430081HubeiChina National-Provincial Joint Engineering Research Center of High Temperature Materials and Lining Technology Wuhan University of Science and TechnologyWuhan 430081HubeiChina Chair of Ceramics Montanuniversitaet Leoben8700 LeobenAustria The Key Laboratory of Chemical Metallurgy Engineering of Liaoning Province and School of Materials and Metallurgy University of Science and Technology LiaoningAnshan 114051LiaoningChina

The service life of the purging plug is one of the fundamental factors that determine the downtime and usage efficiency of the whole *** creep behaviour of the purging plug was thus investigated to identify the possible failure *** first,the creep parameters of the Norton–Bailey strain hardening rule were inversely identified via the results of the creep ***,the thermal-solid coupling model approach was employed to predict the creep behaviour of the purging plug,in which the Norton–Bailey strain hardening rule was *** numerical results show that the temperature of the purging plug presents a cyclic trend after the first service period since the preheating temperature is lower than the temperature of molten ***,the distribution of the creep strain intensity in a layered form could also contribute to a gradual spalling of the purging plug end in ***,the creep strain concentration around the slit can be responsible for the clogging of the purging plug.

关键词： Strain hardening Creep test Creep deformation Purging plug Castable corundum

Thermodynamical and Statistical-Mechanical Entropies of the General Static Spherically Symmetric Black Hole

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Chinese Physics Letters 1998年第4期15卷 240-242页

作者： jing Ji-liang Institute of Physics and Department of Physics Hu’nan Normal UniversityChangsha 410081

The thermodynamical entropy of the general four-dimensional static spherically symmetric black hole is obtained by using the Euclidean path integral approach of Gibbons-Hawking,and its statistical-mechanical entropy is calculated according to the brick wall model of’t *** is shown that the two entropies are not identical in general and the difference between them depends on the area of the horizon and the Ricci scalar curvature on the event horizon.

关键词： entropy curvature Ricci

Quantum Corrections to the Entropy of the Black Hole with a Global Monopole or a Cosmic String

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Chinese Physics Letters 1997年第7期14卷 495-498页

作者： jing Ji-liang Institute of Physics and Department of PhysicsHunan Normal UniversityChangsha 410081

The quantum corrections to the entropy of the static black holes with a global monopole or a cosmic string are studied by two methods:the brick wall and the Euclidean path *** we ignore the usual contribution from the vacuum surrounding the system,then the two approaches give the same *** quantum corrections for the static black holes consist of two parts:One is quadratically divergent term which takes the geometric *** other is a logarithmically divergent term which is not proportional to the horizon *** renormalization of the quadratically and logarithmically divergent is also investigated.

关键词： correction quadratic logarithmic

Efficacy and safety of intravitreal ranibizumab with panretinal photocoagulation followed by trabeculectomy compared with Ahmed glaucoma valve implantation in neovascular glaucoma

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International Journal of Ophthalmology(English edition) 2017年第3期10卷 400-405页

作者： jin-Tao Sun Hai-jing liang Meng An Da-Bo Wang Qingdao University Qingdao 266000 Shandong Province China Department of Ophthalmology Qingdao Economic and Technological Development Area First People's Hospital Qingdao 266555 Shandong Province China Department of Ophthalmology Laixi People's Hospital Qingdao 266600 Shandong Province China Department of Ophthalmology Qingdao Traditional Chinese Medical Hospital of Huangdao District Qingdao 266500 Shandong Province China Department of Ophthalmology the Affiliated Hospital of Qingdao University Qingdao 266000 Shandong Province China

AIM：To evaluate the efficacy and safety of intravitreal ranibizumab（IVR）with panretinal photocoagulation（PRP）followed by trabeculectomy compared with Ahmed glaucoma valve（AGV）implantation in neovascular glaucoma（NVG）.METHODS：This was a retrospective comparative *** reviewed the cases of a total of 45 eyes from 45 NVG patients among which 23 eyes underwent AGV implantation and the other 22 underwent trabeculectomy. The causes of neovascular glaucoma included：diabetic retinopathy（25 eyes）,and retinal vein occlusion（20 eyes）.All patients received preoperative IVR combined with postoperative PRP. The mean best-corrected visual acuities（BCVA）were converted to the logarithms of the minimum angle of resolution（log MAR）for the statisitical *** pressure（IOP）,the log MAR BCVA and surgical complications were evaluated before and after *** follow-up period was 12 ***：A total of 39 cases showed complete regression of iris neovascularization at 7d after injection,and 6 cases showed a small amount of residual iris neovascularization. The success rates were 81.8% and 82.6% at 12 mo after trabeculectomy and AGV implantation,respectively. In the trabeculectomy group,the log MAR BCVA improved at the last follow-up in 14 eyes,remained stable in 6 eyes and decreased in 2 eyes. In 4 cases,slight hyphemas developed after trabeculectomy. A shallow anterior chamber developed in 2 cases and 2 vitreous hemorrhages. In the AGV group,the log MAR BCVA improved in 14 eyes,remained stable in 5 eyes and decreased in 4 eyes. Slight hyphemas developed in 3 cases,and a shallow anterior chamber in 3 cases. The mean postoperative IOP was significantly lower in both groups after surgery（F=545.468,P〈0.05）,and the mean postoperative log MAR BCVA was also significantly improved（F=10.964,P〈0.05）with no significant difference between two ***：It is safe and effective to treat NVG with this combined procedure,and we found similar results after IVR＋AGV implantat

关键词： neovascular glaucoma trabeculectomy Ahmed drainage valve implantation ranibizumab panretinal photocoagulation

Geochemistry of Clayey Aquitard Pore Water as Archive of Paleo-Environment, Western Bohai Bay

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Journal of Earth Science 2015年第3期26卷 445-452页

作者： jing Li Xing liang Menggui jin Guoqiang Xiao Jishan He Yandong Pei School of Environment Studies China University of Geosciences State Key Laboratory of Biogeology and Environmental Geology China University of Geosciences Tianjin Institute of Geology and Mineral Resources

The record of paleo-environment in clayey aquitard pore water is much more effective relative to aquifer groundwater owing to the low permeability of clayey aquitard. Oxygen-18（18O）, deuterium（D）, and chemical patterns were determined in pore water samples extracted from two 500 m depth boreholes, G1 and G2, in western Bohai Bay, China. Shallow pore water samples（depth〈102 m） are saline water, with the TDS（total dissolved solids） of 3.69–30.75 g/L, and deeper ones（depth=102–500 m） are fresh water, with the TDS〈1 g/L. Content of major ions（i.e., Cl-, Na＋, K＋, Mg2＋, SO2-4, Ca2＋） is high in marine sediment pore water samples and gradually decrease towards to terrestrial sediment pore water, together with the Cl/Br and Sr/Ba ratios changing significantly in different sedimentary facies along the study profile, indicating that pore water may be paleo-sedimentary water and not replaced by modern water. δ18O profile and positive correlation between δ18O and Cl- of shallow saline pore water indicated diffusion as the main transport mechanism, and distinguished four transgressive layers since Late Quaternary（i.e., Holocene marine unit, two Late Pleistocene marine units and Middle Pleistocene marine unit）, further supporting the finding that pore water retained the feature of paleo-sedimentary water. Climate was identified as the main influence on the isotopic signature of aquitard pore water and four climate periods were determined by δ18O profile.

关键词： aquitard pore water paleo-environment geochemistry Bohai Bay