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Distinct Superconducting Gap on Two Bilayer-Split Fermi Surface Sheets in Bi2Sr2CaCu2O8+δ Superconductor
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作者 艾平 高强 +13 位作者 刘静 张玉晓 李聪 黄建伟 宋春尧 闫宏涛 林赵 刘国东 顾根大 张丰丰 杨峰 彭钦军 许祖彦 周兴江 《中国物理快报:英文版》 SCIE CAS CSCD 2019年第6期66-74,共9页
High resolution laser-based angle-resolved photoemission measurements are carried out on an overdoped superconductor Bi2Sr2CaCu2O8+with ac of 75 K.Two Fermi surface sheets caused by bilayer splitting are clearly ident... High resolution laser-based angle-resolved photoemission measurements are carried out on an overdoped superconductor Bi2Sr2CaCu2O8+with ac of 75 K.Two Fermi surface sheets caused by bilayer splitting are clearly identified with rather different doping levels:the bonding sheet corresponds to a doping level of 0.14,which is slightly underdoped while the antibonding sheet has a doping of 0.27 that is heavily overdoped,giving an overall doping level of 0.20 for the sample.Different superconducting gap sizes on the two Fermi surface sheets are revealed.The superconducting gap on the antibonding Fermi surface sheet follows a standard d-wave form while it deviates from the standard d-wave form for the bonding Fermi surface sheet.The maximum gap difference between the two Fermi surface sheets near the antinodal region is~2 meV.These observations provide important information for studying the relationship between the Fermi surface topology and superconductivity,and the layer-dependent superconductivity in high temperature cuprate superconductors. 展开更多
关键词 DISTINCT Superconducting Gap Bilayer-Split FERMI Surface SHEETS Bi2Sr2CaCu2O8+δSuperconductor
Disappearance of Superconductivity and a Concomitant Lifshitz Transition in Heavily Overdoped Bi2Sr2CuO6 Superconductor Revealed by Angle-Resolved Photoemission Spectroscopy
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作者 丁颖 赵林 +22 位作者 闫宏涛 高强 刘静 胡成 黄建伟 李聪 徐煜 蔡永青 戎洪涛 吴定松 宋春尧 周花雪 董晓莉 刘国东 王庆艳 张申金 王志敏 张丰丰 杨峰 彭钦军 许祖彦 陈创天 周兴江 《中国物理快报:英文版》 SCIE CAS CSCD 2019年第1期60-64,共5页
By partially doping Pb to effectively suppress the superstructure in single-layered cuprate Bi2Sr2CuO6+δ (Pb- Bi2201)and annealing them in vacuum or in high pressure oxygen atmosphere,a series of high quality Pb-Bi22... By partially doping Pb to effectively suppress the superstructure in single-layered cuprate Bi2Sr2CuO6+δ (Pb- Bi2201)and annealing them in vacuum or in high pressure oxygen atmosphere,a series of high quality Pb-Bi2201 single crystals are obtained with Tc covering from 17K to non-superconducting in the overdoped region.High resolution angle resolved photoemission spectroscopy measurements are carried out on these samples to investigate the evolution of the Fermi surface topology with doping in the normal state.Clear and complete Fermi surfaces are observed and quantitatively analyzed in all of these overdoped Pb-Bi2201 samples.A Lifshitz transition from hole-like Fermi surface to electron-like Fermi surface with increasing doping is observed at a doping level of -0.35.This transition coincides with the change that the sample undergoes superconducting-to-non-superconducting states. Our results reveal the emergence of an electron-like Fermi surface and the existence of a Lifshitz transition in heavily overdoped Bi2201 samples.This provides important information in understanding the connection between the disappearance of superconductivity and the Lifshitz transition in the overdoped region. 展开更多
关键词 ANGULAR RESOLVED light emission spectrometry CONCOMITANT Lifshitz Transition Bi2Sr2CuO6
Evolution of incommensurate superstructure and electronic structure with Pb substitution in(Bi2-xPbx)Sr2CaCu2O8+δ superconductors
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作者 刘静 赵林 +24 位作者 高强 艾平 张璐 谢涛 黄建伟 丁颖 胡成 闫洪涛 宋春尧 徐煜 李聪 蔡永青 戎洪涛 吴定松 刘国东 王庆艳 黄元 张丰丰 杨峰 彭钦军 李世亮 杨槐馨 李建奇 许祖彦 周兴江 《中国物理B:英文版》 SCIE EI CAS CSCD 2019年第7期102-110,共9页
High-quality Bi2-xPbxSr2 CaCu2O8+δ(Bi2212) single crystals have been successfully grown by the traveling solvent floating zone technique with a wide range of Pb substitution(x = 0–0.8).The samples are characterized ... High-quality Bi2-xPbxSr2 CaCu2O8+δ(Bi2212) single crystals have been successfully grown by the traveling solvent floating zone technique with a wide range of Pb substitution(x = 0–0.8).The samples are characterized by transmission electron microscope(TEM) and measured by high resolution laser-based angle-resolved photoemission spectroscopy(ARPES) with different photon energies.A systematic evolution of the electronic structure and superstructure with Pb substitution has been revealed for the first time.The superstructure shows a significant change with Pb substitution and the incommensurate modulation vector(Q) decreases with increasing Pb substitution.In the meantime, the superstructure intensity from ARPES measurements also decreases dramatically with increasing Pb concentration.The superstructure in Bi2212 can be effectively suppressed by Pb substitution and it nearly disappears with a Pb substitution of x = 0.8.We also find that the superstructure bands in ARPES measurements depend sensitively on the photon energy of lasers used;they can become even stronger than the main band when using a laser photon energy of 10.897 eV.These results provide important information on the origin of the incommensurate superstructure and its control and suppression in bismuth-based high temperature superconductors. 展开更多
关键词 Bi2-xPbxSr2CaCu2O8+δ SUPERSTRUCTURE electronic structure angle-resolved PHOTOEMISSION spectroscopy(ARPES) modulation
Quantitative and Spatially Resolved Measurement of Atomic Potassium in Combustion Using Diode Laser
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作者 高强 翁武斌 +1 位作者 李博 李中山 《中国物理快报:英文版》 SCIE CAS CSCD 2018年第2期21-24,共4页
关键词 二极管激光 测量线 原子 燃烧 空间 激光吸收 光谱学
老年股骨转子间骨折术前康复训练效果研究 预览 被引量:2
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作者 王妙维 陈宝玉 +1 位作者 高强 何成奇 《中国现代医学杂志》 2018年第15期92-95,共4页
目的研究老年股骨转子间骨折(IFF)术前开始康复训练的治疗效果。方法回顾性分析2014年1月-2016年10月该院接受闭合复位防旋股骨近端髓内钉内固定术手术治疗的老年IFF患者110例。根据患者是否术前接受康复训练分为术前训练组和对照组,... 目的研究老年股骨转子间骨折(IFF)术前开始康复训练的治疗效果。方法回顾性分析2014年1月-2016年10月该院接受闭合复位防旋股骨近端髓内钉内固定术手术治疗的老年IFF患者110例。根据患者是否术前接受康复训练分为术前训练组和对照组,两组术后康复训练计划相同。比较两组并发症的发生情况,入院、出院时疼痛评分(VAS),术后早期离床活动率,出院及术后3个月Barthel指数评分,住院天数和住院费用。结果术前训练组术后并发症发生人数少于对照组,而术后早期离床活动率高于对照组(P〈0.05);出院术前训练组VAS低于对照组(P〈0.05),而Barthel指数评分高于对照组(P〈0.05);住院天数有缩短,住院费用降低。患者出院后门诊随访3~6个月,失访7例。术前训练组术后3个月Barthel指数评分高于对照组(P〈0.05)。结论老年IFF围手术期进行康复干预,物理治疗师术前开始对患者进行康复训练的效果优于术后开始康复训练。 展开更多
关键词 康复 股骨转子间骨折 创伤
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Structural behavior of F- in mould flux melt of CaO-SiO2-Al2 O3-Na2O- CaF2 system
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作者 Qiang Gao Yi Min +1 位作者 Cheng-jun Liu Mao-fa Jiang 《钢铁研究学报:英文版》 SCIE EI CAS CSCD 2017年第11期1152-1158,共7页
The influence of fluorine on the structure of CaO-SiO_2-Al_2O_3-Na_2O-CaF_2 continuous-casting-type slag was measured by Raman spectroscopy,and the degree of polymerization of mould flux and the structural behavior of... The influence of fluorine on the structure of CaO-SiO_2-Al_2O_3-Na_2O-CaF_2 continuous-casting-type slag was measured by Raman spectroscopy,and the degree of polymerization of mould flux and the structural behavior of F-in the melt were investigated by classifying and quantifying the structural species of F-ions.The results exhibit that the main structural units of Si-O tetrahedra are Q~0,Q~1 and Q~2,and the actual measured number of non-bridging oxygen ions in the[SiO_4]-tetrahedra(denoted by NBO/T)increases from 2.73 to 3.44 with increasing the molar ratio of F to(F+O)(denoted by X_F/X_((F+O)) from 0.06 to 0.19.It means that the degree of polymerization of melt structure decreases with an increase in X_F/X_((F+O)).In addition,most of F-ions were distributed in Si-O tetrahedra and Al-O tetrahedra.With increasing X_F/X_((F+O)),the complex structural units Al-O tetrahedra are gradually replaced by discrete structural units AlF4-because of the breakage of Al-O bonds in Al-O tetrahedra by F-ions,and the SiO(bridging oxygen)bonds of Si-O tetrahedra are broken to form [SiO_nF_(4-n)]-tetrahedra by F-ions coordinating with Si~(4+). 展开更多
Temperature-induced Lifshitz transition in topological insulator candidate HfTe5
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作者 Yan Zhang Chenlu Wang +21 位作者 Guodong Liu Aiji Liang Lingxiao Zhao Jianwei Huang Qiang Gao Bing Shen Jing Liu Cheng Hu Wenjuan Zhao GenfuChen Xiaowen Jia Li Yu Lin Zhao Shaolong He Fengfeng Zhang Shenjin Zhang Feng Yang Zhimin Wang Qinjun peng Zuyan Xu Chuangtian Chen Xingjiang Zhou 《科学通报:英文版》 SCIE EI CSCD 2017年第13期950-956,共7页
The ongoing discoveries and studies of novel topological quantum materials have become an emergent and important field of condensed matter physics.Recently,HfTe_5 ignited renewed interest as a candidate of a novel top... The ongoing discoveries and studies of novel topological quantum materials have become an emergent and important field of condensed matter physics.Recently,HfTe_5 ignited renewed interest as a candidate of a novel topological material.The single-layer HfTe_5 is predicted to be a two-dimensional large band gap topological insulator and can be stacked into a bulk that may host a temperature-driven topological phase transition.Historically,HfTe_5 attracted considerable interest for its anomalous transport properties characterized by a peculiar resistivity peak accompanied by a sign reversal carrier type.The origin of the transport anomaly remains under a hot debate.Here we report the first high-resolution laser-based angle-resolved photoemission measurements on the temperature-dependent electronic structure in HfTe_5.Our results indicated that a temperature-induced Lifshitz transition occurs in HfTe_5,which provides a natural understanding on the origin of the transport anomaly in HfTe_5.In addition,our observations suggest that HfTe_5 is a weak topological insulator that is located at the phase boundary between weak and strong topological insulators at very low temperature. 展开更多
关键词 温度诱导 弱拓扑 绝缘体 候选人 凝聚态物理学 反常输运性质 电子能谱测量 载体类型
Effects of Mg on diamond growth and properties in Fe–C system under high pressure and high temperature condition
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作者 黄国锋 郑友进 +5 位作者 李战厂 高强 马卓 史思明 姜宝钢 赵赫 《中国物理B:英文版》 SCIE EI CAS CSCD 2016年第8期417-420,共4页
Diamond crystal crystallized in Fe–Mg–C system with Archimedes buoyancy as a driving force is established under high pressure and high temperature conditions. The experimental results indicate that the addition of t... Diamond crystal crystallized in Fe–Mg–C system with Archimedes buoyancy as a driving force is established under high pressure and high temperature conditions. The experimental results indicate that the addition of the Mg element results in the nitrogen concentration increasing from 87 ppm to 271 ppm in the diamond structure. The occurrence of the {100}plane reveals that the surface character is remarkably changed due to the addition of Mg. Micro-Raman spectra indicate that the half width of full maximum is in a range of 3.01 cm~(-1)–3.26 cm~(-1), implying an extremely good quality of diamond specimens in crystallization. 展开更多
关键词 高温条件 金刚石生长 FE 高压 性能 显微拉曼光谱 金刚石晶体
茶的主要化学成分及药理作用研究进展 预览
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作者 史小四 高强 +2 位作者 胡常菊 季春鹏 张卫伟 《药物化学》 2016年第1期1-9,共9页
本文综述茶的化学成分、药理作用进展。茶对心脑血管、呼吸系统、免疫系统、抗癌、抗辐射、抗氧化等具有显著的药理作用;茶富含茶多酚、茶多糖、茶色素、蛋白质和氨基酸、碳水化合物、矿物质等化学成分,这些化合物与上述的药理作用密切... 本文综述茶的化学成分、药理作用进展。茶对心脑血管、呼吸系统、免疫系统、抗癌、抗辐射、抗氧化等具有显著的药理作用;茶富含茶多酚、茶多糖、茶色素、蛋白质和氨基酸、碳水化合物、矿物质等化学成分,这些化合物与上述的药理作用密切相关。 展开更多
关键词 化学成分 药理作用
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一种高活性、稳定碳载铂钴镍合金的氧还原催化剂(英文)
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作者 郑亚荣 高敏锐 +5 位作者 李会会 高强 Muhammad Nadeem Arshad Hassan A.Albar Tariq R.Sobahi 俞书宏 《中国科学:材料科学(英文版)》 CSCD 2015年第3期179-185,共8页
近年来,质子交换膜燃料电池由于高成本严重阻碍了其商业化进程,而目前催化阴极氧气还原反应最高效的催化剂仍然是昂贵的铂催化剂,因此设计、开发制备少铂、高效、稳定的催化剂是目前此领域研究的热点.本论文利用一种简便的制备方法得到... 近年来,质子交换膜燃料电池由于高成本严重阻碍了其商业化进程,而目前催化阴极氧气还原反应最高效的催化剂仍然是昂贵的铂催化剂,因此设计、开发制备少铂、高效、稳定的催化剂是目前此领域研究的热点.本论文利用一种简便的制备方法得到了碳负载的铂钴镍(摩尔比=1:2:2)三元合金纳米颗粒催化剂,这种合金催化剂在改变铂电子结构的同时,大大降低了贵金属铂的用量.电化学测试结果显示这种多元合金催化剂的半波电势与商业铂碳相比提高了约57 m V,而且优于同体系制备的二元合金催化剂和其他组分三元合金催化剂.此外,在酸性电解质溶液中,此催化剂表现出更优异的稳定性.在燃料电池技术领域,这种多元合金催化剂很可能在将来发展成新电催化剂来替代铂材料. 展开更多
R576吲哚美辛栓剂预防经内镜逆行胰胆管取石术后胰腺炎的疗效观察 预览 被引量:15
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作者 苏秀丽 高强 张英剑 《中国内镜杂志》 北大核心 2015年第4期411-413,共3页
目的明确经内镜行胰胆管造影术(ERCP)取石术后吲哚美辛对胰腺炎的预防作用。方法回顾性分析178例因胆总管结石行ERCP治疗的患者资料,根据是否术后应用吲哚美辛,分为吲哚美辛组(96例)及对照组(82例)。吲哚美辛组患者术后0.5 h使用... 目的明确经内镜行胰胆管造影术(ERCP)取石术后吲哚美辛对胰腺炎的预防作用。方法回顾性分析178例因胆总管结石行ERCP治疗的患者资料,根据是否术后应用吲哚美辛,分为吲哚美辛组(96例)及对照组(82例)。吲哚美辛组患者术后0.5 h使用吲哚美辛100 mg塞肛。比较两组患者术前、术后3 h、12 h和24 h血淀粉酶监测值及胰腺炎发生情况。结果吲哚美辛组96例,术后发生PEP 1例(1.0%)。对照组82例,术后胰腺炎(PEP)8例(9.7%),两组比较差异有显著(P〈0.05)。吲哚美辛组高胰淀粉酶血症明显低于对照组(5.21%比18.29%,P〈0.05)。结论内镜下取石术后使用吲哚美辛栓能够降低术后胰腺炎和高淀粉酶血症的发生率。 展开更多
关键词 内镜逆行胰胆管造影术 术后胰腺炎 高淀粉酶血症 吲哚美辛栓
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Factorial study of moxibustion in treatment of diarrhea-predominant irritable bowel syndrome 预览
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作者 Ji-Meng Zhao Lu-Yi Wu +10 位作者 Hui-Rong Liu Hong-Yi Hu Jia-Ying Wang Ren-Jia Huang Yin Shi Shan-Ping Tao Qiang Gao Ci-Li Zhou Li Qi Xiao-Peng Ma Huan-Gan Wu 《世界胃肠病学杂志:英文版(电子版)》 SCIE CAS 2014年第37期13563-13572,共10页
AIM: To identify an appropriate therapeutic regimen for using aconite cake-separated moxibustion to treat diarrhea-predominant irritable bowel syndrome(D-IBS).METHODS: A factorial design was employed to examine the tw... AIM: To identify an appropriate therapeutic regimen for using aconite cake-separated moxibustion to treat diarrhea-predominant irritable bowel syndrome(D-IBS).METHODS: A factorial design was employed to examine the two factors of moxibustion frequency and number of cones. The two tested frequencies were three or six moxibustion sessions per week, and the two tested doses were one or two cones per treatment. A total of 166 D-IBS patients were randomly divided into four treatment groups, which included each combination of the examined frequencies and doses. The bilateral Tianshu acupoints(ST25) and the Qihai acupoint(RN6) were selected for aconite cake-separated moxibustion. Each patient received two courses of treatment, and each course had a duration of 2 wk. For each group, the scores on the Birmingham irritable bowel syndrome(IBS) symptom questionnaire, the IBS Quality of Life scale, the Self-Rating Depression Scale(SDS), the Self-Rating Anxiety Scale(SAS), the Hamilton Depression(HAMD) scale, and the Hamilton Anxiety(HAMA) scale were determined before treatment, after the first course of treatment, and after the second course of treatment. RESULTS: The symptom, quality of life, SDS, SAS, HAMD, and HAMA scores of the patients in all 4 aconite cake-separated moxibustion groups were significantly lower after the first and second courses of treatment than before treatment(P < 0.001 for all). The symptom, quality of life, SDS, SAS, HAMD, and HAMA scores of the patients in all four aconite cake-separated moxibustion groups were significantly lower after the second course of treatment than after the first course of treatment(P < 0.001 for all). Between-group comparisons after the second course of treatment revealed that the symptom scores for group 1(1 cone, 3 treatments/wk) and group 3(2 cones, 3 treatments/wk) were significantly lower than that for group 2(1 cone, 6 treatments/wk)(5.55 ± 5.05 vs 10.45 ± 6.61, P < 0.001; 5.65 ± 4.00 vs 10.45 ± 6.61, P < 0.001). Regarding the two levels of the two examined factor 展开更多
关键词 Diarrhea-predominant IRRITABLE BOWEL SYNDROME Acon
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Parametric variational solution of linear-quadratic optimal control problems with control inequality constraints 预览 被引量:2
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作者 彭海军 高强 +2 位作者 张洪武 吴志刚 钟万勰 《应用数学和力学:英文版》 SCIE EI 2014年第9期1079-1098,共20页
A parametric variational principle and the corresponding numerical algorithm are proposed to solve a linear-quadratic(LQ)optimal control problem with control inequality constraints.Based on the parametric variational ... A parametric variational principle and the corresponding numerical algorithm are proposed to solve a linear-quadratic(LQ)optimal control problem with control inequality constraints.Based on the parametric variational principle,this control problem is transformed into a set of Hamiltonian canonical equations coupled with the linear complementarity equations,which are solved by a linear complementarity solver in the discrete-time domain.The costate variable information is also evaluated by the proposed method.The parametric variational algorithm proposed in this paper is suitable for both time-invariant and time-varying systems.Two numerical examples are used to test the validity of the proposed method.The proposed algorithm is used to astrodynamics to solve a practical optimal control problem for rendezvousing spacecrafts with a finite low thrust.The numerical simulations show that the parametric variational algorithm is effective for LQ optimal control problems with control inequality constraints. 展开更多
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细乳液聚合制备球形聚丙烯腈乳胶粒子 预览 被引量:1
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作者 沈慧芳 高强 陈焕钦 《高分子材料科学与工程》 EI CAS CSCD 北大核心 2014年第1期6-10,共5页
采用过氧化氢/L-抗坏血酸(H202/L-AA)氧化还原引发荆引发丙烯腈(AN)的细乳液聚合;探讨了乳化剂、单体和引发剂浓度以及聚合温度对聚丙烯腈(PAN)乳胶粒子的粒径、形态的影响,通过扫描电镜(SEM)和X射线衍射(XRD)分析了球形... 采用过氧化氢/L-抗坏血酸(H202/L-AA)氧化还原引发荆引发丙烯腈(AN)的细乳液聚合;探讨了乳化剂、单体和引发剂浓度以及聚合温度对聚丙烯腈(PAN)乳胶粒子的粒径、形态的影响,通过扫描电镜(SEM)和X射线衍射(XRD)分析了球形PAN乳胶粒子的形成机理。在AN质量分数为10%,助稳定剂十六烷(HD)为基于AN质量的4%,乳化剂十二烷基硫酸钠(SUS)和引发剂浓度分别为基于水相的8mmol/L和1.6mmol/L时,制备出了粒径为67.54nm的规则球形PAN乳胶粒子,并发现聚合温度是控制PAN乳胶粒子形态的关键因素。通过与热引发剂体系过硫酸钾(KPS)和偶氮二异丁腈(AIBN)分析比较,进一步表明低温聚合能降低PAN乳胶粒子表面结晶,是PAN乳胶粒子呈现出规则球形的原因。 展开更多
关键词 细乳液聚合 氧化还原引发剂 球形 聚丙烯腈 乳胶粒子 表面结晶
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碳纤维编织复合材料板材热冲压成形的实验和模拟研究 预览
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作者 张琦 高强 蔡进 《中国有色金属学报:英文版》 SCIE EI CAS CSCD 2014年第1期217-223,共7页
提出一种新型的复合材料成形工艺,即热冲压成形,来直接成形复合材料。为了研究复合材料板的成形行为,分析了成形温度对零件的影响,进行了热弯曲和热拉深实验。实验结果表明,编织复合材料板的锁止角为30°,在成形过程中,变形... 提出一种新型的复合材料成形工艺,即热冲压成形,来直接成形复合材料。为了研究复合材料板的成形行为,分析了成形温度对零件的影响,进行了热弯曲和热拉深实验。实验结果表明,编织复合材料板的锁止角为30°,在成形过程中,变形载荷一般小于5 N,并且变形载荷随着温度的升高而降低。成形碳纤维复合材料板的最佳温度是170℃。采用有限元分析软件ABAQUS对模具的温度场分布和复合材料板的变形进行了数值模拟。为了研究碳纤维在成形过程中的运动,采用两节点的三维Truss 单元T2D3对纤维进行网格剖分,模拟结果与试验结果相吻合。 展开更多
关键词 热冲压 碳纤维复合板 剪切角 弯曲 拉深
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Relay selection based on MAP estimation for cooperative communication with outdated channel state information
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作者 Ding Wenrui Fei Li +1 位作者 Gao Qiang Liu Shuo 《中国航空学报:英文版》 SCIE EI CSCD 2013年第3期661-667,共7页
在这份报纸,当在继电器选择使用的隧道状态信息(CSI ) 在数据传播期间不同于那时,我们认为 amplify-and-forward (AF ) 是合作通讯系统,即,在继电器选择使用的 CSI 是过时的。选择继电器不能实际上是最好因为数据传播和合作系统的... 在这份报纸,当在继电器选择使用的隧道状态信息(CSI ) 在数据传播期间不同于那时,我们认为 amplify-and-forward (AF ) 是合作通讯系统,即,在继电器选择使用的 CSI 是过时的。选择继电器不能实际上是最好因为数据传播和合作系统的停止性能将败坏。改进它的表演,我们基于最大值建议继电器选择策略一个 posteriori (地图) 评价,在继电器基于预言的 signal-to-noise 比率(SNR ) 被选择的地方。减少计算复杂性,我们接近 SNR 的 posteriori 概率密度并且基于近似地图评价(RS-AMAP ) 获得靠近形式的预言的 SNR,和继电器选择策略被建议。模拟结果证明这近似从停止概率的观点导致小表演损失。与在文学给的继电器选择策略相比,停止概率为播送力量和 medium-to-high 隧道关联系数的 medium-to-large 主要通过 RS-AMAP 被减少。 展开更多
关键词 信道状态信息 MAP估计 通信继电器 协作 选择策略 中断性能 预测信号 中断概率
Different histological subtypes of parotid gland tumors: CT findings and diagnostic strategy 预览
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作者 Zhi-Feng Xu Fang Yong +5 位作者 Tian Yu Ying-Yu Chen Qiang Gao Tao Zhou Ai-Zhen Pan Ren-Hua Wu 《世界放射学杂志:英文版(电子版)》 2013年第8期313-320,共8页
AIM:To present computed tomography(CT) findings of different histological subtypes of parotid gland masses in detail and to establish diagnostic strategy.METHODS:From January 2009 to November 2011,56 patients were co... AIM:To present computed tomography(CT) findings of different histological subtypes of parotid gland masses in detail and to establish diagnostic strategy.METHODS:From January 2009 to November 2011,56 patients were collected through the histopathology and Picture Archiving and Communication Systems records,which revealed 5 basal cell adenoma(BCA),16 pleomorphic adenoma(PA),25 Warthin’s tumor(War-T),3 Kimura’s disease(KD) and 7 parotid carcinoma(PCa) cases.All the CT images were retrospectively analyzed by two radiologists in consensus,based on their description of morphology(location,number,size,margin and fibrous capsule) and enhancement patterns of masses.In addition,the diagnostic efficiency of diagnostic strategy is tested.RESULTS:War-T and BCA patients’ mean age was 59.9 ± 12.6 years and 58.4 ± 18.2 years;the significant difference was seen in War-T vs PA and BCA vs PA.About 40% of War-Ts presented with bilateral multifocal lesions,a higher ratio than others.Seventy two percent of War-Ts were limited to the superficial lobe,followed by BCA 60% and PA 40%.Vessel facing sign and enlarged lymph nodes were both frequent in War-T,which respectively accounts for 84% and 76% of cases.Rapid contrast enhancement and decreases were unique for War-T.BCA and PA showed obvious delayed enhancement.The diagnostic strategy of parotid gland tumor had a good diagnostic efficiency,with high accuracy,sensitivity and specificity.CONCLUSION:Determination of the histological subtypes of parotid gland masses might be possible based on CT findings and clinical data.A diagnostic strategy with high diagnostic efficiency was established. 展开更多
关键词 PAROTID GLAND TUMOR PLEOMORPHIC ADENOMA Warthin’s TUMOR Multi SLICE computed tomography
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Fast precise integration method for hyperbolic heat conduction problems 预览
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作者 吴峰 高强 钟万勰 《应用数学和力学:英文版》 SCIE EI 2013年第7期791-800,共10页
A fast precise integration method is developed for the time integral of the hyperbolic heat conduction problem. The wave nature of heat transfer is used to analyze the structure of the matrix exponential, leading to t... A fast precise integration method is developed for the time integral of the hyperbolic heat conduction problem. The wave nature of heat transfer is used to analyze the structure of the matrix exponential, leading to the fact that the matrix exponential is sparse. The presented method employs the sparsity of the matrix exponential to improve the original precise integration method. The merits are that the proposed method is suit- able for large hyperbolic heat equations and inherits the accuracy of the original version and the good computational efficiency, which are verified by two numerical examples. 展开更多
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Effects of anesthetic methods on preserving anti-tumor T-helper polarization following hepatectomy 预览
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作者 Di Zhou Fang-Ming Gu +3 位作者 Qiang Gao Quan-Lin Li Jian Zhou Chang-Hong Miao, 《世界胃肠病学杂志:英文版》 SCIE CAS CSCD 2012年第24期3089-3098,共10页
瞄准:在 hepatocellular 在 T 助手(Th ) 房间子集上调查不同麻药技术的影响癌(HCC ) 病人经历 hepatectomy。方法:收到了 hepatectomies 的 61 个 HCC 病人被使随机化进硬膜上的联合一般麻醉(G + E;n = 31 ) 或一般麻醉(G;n = 30 )... 瞄准:在 hepatocellular 在 T 助手(Th ) 房间子集上调查不同麻药技术的影响癌(HCC ) 病人经历 hepatectomy。方法:收到了 hepatectomies 的 61 个 HCC 病人被使随机化进硬膜上的联合一般麻醉(G + E;n = 31 ) 或一般麻醉(G;n = 30 ) 组。血样品被获得在操作(d0 ) 前的早上,并且在上第二(d2 ) 并且第七(d7 ) 在操作以后的白天。Th 房间内容用流动 cytometry,即时反向的抄写聚合酶链反应和连接酶的 immunosorbent 试金被评估。结果:在所有 61 个病人, Th1 和 Th2 房间频率,和干扰素 --(IFN-) mRNA 表示显著地在 d2 上增加了,与 d0 相比。他们在 d7 上稍微恢复了,并且 Th1/Th2 比率在 d7 上显著地增加了,与 d2 相比。相反, Th17,规章的 T 房间(Treg ) ,和 interleukin-17 (IL-17 ) 层次和 FOXP3 mRNA 表示没在 d2 上显示出重要变化,然后显著地在 d7 上减少了。同样, d2 上的血浆 IFN- 集中在 d0 上比那高得多,然后部分在 d7 上恢复了。作为与 G 组相比,在 G + E 组, Th1 房间频率和 Th1/Th2 比率在 d7 上更高在 d2 上并且显著地是稍微更高的当 Th2, Th17,和 Treg 房间频率在 d2 上是稍微更低的,并且显著地在 d7 上降低时。在 d7 上,一致地,在 G + E 的 IFN- mRNA 和蛋白质层次和 IFN-/IL-4 比率组织比在 G 组的那些高。相反, IL-17 mRNA 水平和在 G + E 组的转变生长 factor-1 集中是比在 G 组的那些低的。结论:G + E 比在当减少时,向 Th1 转移 Th1/Th2 平衡的 G 优异 Th17 和 Treg,由支持反肿瘤 Th 的潜在地受益的 HCC 病人极化。 展开更多
关键词 麻醉方法 抗肿瘤 MRNA表达水平 酶联免疫吸附试验 IL-17 肝细胞癌 白细胞介素17 偏振
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Prognostic significance and clinical relevance of Sprouty 2 protein expression in human hepatocellular carcinoma 预览
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《国际肝胆胰疾病杂志:英文版》 SCIE CAS 2012年第2期177-184,共8页
BACKGROUND:In vitro experiments and mice models have confirmed the importance of Sprouty 2(Spry2) in inhibiting tumorigenesis and the progression of human cancer.However,the prognostic value of Spry2 in cancer patien... BACKGROUND:In vitro experiments and mice models have confirmed the importance of Sprouty 2(Spry2) in inhibiting tumorigenesis and the progression of human cancer.However,the prognostic value of Spry2 in cancer patients remains unknown.This study is aimed to investigate the clinical relevance and prognostic significance of Spry2 expression in patients with hepatocellular carcinoma(HCC).METHODS:With samples from 240 randomly-selected HCC patients who underwent surgery,immunohistochemistry was used to investigate Spry2 expression on tissue microarrays.The correlation of Spry2 expression with survival was estimated by the Kaplan-Meier method and univariate/multivariate Cox proportional hazard regression analysis.Spry2,ERK and phospho-ERK expression in HCC cell lines was detected by Western blotting.RESULTS:Among the patients,86.3%(207 of 240) exhibited down-regulation of Spry2 expression.Patients negative for Spry2 showed poorer survival(P=0.002) and increased recurrence(P=0.003).Multivariate analysis further established Spry2 as an independent predictor of postoperative recurrence in HCC patients(HR=1.47;95% CI,1.02-2.08;P=0.037).Downregulation of Spry2 was associated with highly malignant phenotypes like vascular invasion and advanced tumor stages,and was positively correlated with the metastatic potential of HCC cell lines.CONCLUSION:In the era of molecular targeted therapy,the expression of Spry2 in HCC may have relevant clinical significance and turn out to be a key factor in prognostic assessment and in treatment planning. 展开更多
关键词 HEPATOCELLULAR carcinoma SPROUTY 2 TUMOR SUPPRESSOR PROGNOSIS
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