Buried Si<sub>3</sub>N<sub>4</sub> layer is formed by hitrogen ion implanted silicoh with high energy （400Key） and high dose (1×10<sup>18</sup>/cm<sup>2</sup>). T...Buried Si<sub>3</sub>N<sub>4</sub> layer is formed by hitrogen ion implanted silicoh with high energy （400Key） and high dose (1×10<sup>18</sup>/cm<sup>2</sup>). The unimplanted single crystal zone is used as seed crystal. Seed inducing recrystallization is carried out by autoscanning Nd: YAG CW laser annealing. We got a large area SOI structure sample.展开更多
As ion implanted damage of silicon was removed by Rapid ThermalAnnealing(RTA)using Model KST-1 RTA appakatus.Removal ofdamage and dopant redistribution were investigated by RutherfordBackscattering Spectra(RBS)and Ext...As ion implanted damage of silicon was removed by Rapid ThermalAnnealing(RTA)using Model KST-1 RTA appakatus.Removal ofdamage and dopant redistribution were investigated by RutherfordBackscattering Spectra(RBS)and Extended Resistance.Sheet resistanceand carrier Hall mobility was mesaured by Van der Panw method.展开更多
In this paper, damages and annealing effects of X,Y and Z cut LiNbO-3 implanted by 350keV high energy Ti (1.5 x 10<sup>17</sup> / cm<sup>2</sup>) are studied. The surface damages of X,Y cut pla...In this paper, damages and annealing effects of X,Y and Z cut LiNbO-3 implanted by 350keV high energy Ti (1.5 x 10<sup>17</sup> / cm<sup>2</sup>) are studied. The surface damages of X,Y cut plates are nearly amorphous, but the surface damage of Z cut does not reach saturation. Radiation damage is mainly due to Nb moving atoms and Ti atoms occupy the interstitial sites. By annealing the sample at 1000℃, most damage is removed from the boundary between implanted layer and LiNbO<sub>3</sub> base to surface.展开更多
In this study,Mg-based composites,by the addition of ZnO,Ca_(2)ZnSi_(2)O_(7),Ca_(2)MgSi_(2)O_(7),and CaSiO_(3)as bioactive agents,were fabricated using friction stir processing.The microstructure and in vitro assessme...In this study,Mg-based composites,by the addition of ZnO,Ca_(2)ZnSi_(2)O_(7),Ca_(2)MgSi_(2)O_(7),and CaSiO_(3)as bioactive agents,were fabricated using friction stir processing.The microstructure and in vitro assessment of bioactivity,biodegradation rate,and corrosion behavior of the resultant composites were investigated in simulated body fluid(SBF).The results showed that during the immersion of composites in SBF for 28 d,due to the release of Ca^(2+)and PO_(4)^(3-)ions,hydroxyapatite(HA)crystals with cauliflower shaped morphology were deposited on the surface of composites,confirming good bioactivity of composites.In addition,due to the uniform distribution of bioceramic powders throughout Mg matrix,grain refinement of the Mg matrix,and uniform redistribution of secondary phase particles,the polarization resistance increased,and the biodegradation rate of composites significantly reduced compared to monolithic Mg matrix.The polarization corrosion resistance of Mg-ZnO increased from 0.216 to 2.499 kΩ/cm^(2)compared to monolithic Mg alloy.Additionally,Mg-ZnO composite with the weight loss of 0.0217 g after 28 d immersion showed lower weight loss compared to other samples with increasing immersion time.Moreover,Mg-ZnO composite with the biodegradation rate of 37.71 mm/a exhibited lower biodegradation rate compared to other samples with increasing immersion time.展开更多
The response wavelength of the blocked-impurity-band(BIB)structured infrared detector can reach 200µm,which is the most important very long wavelength infrared astronomical detector.The ion implantation method gr...The response wavelength of the blocked-impurity-band(BIB)structured infrared detector can reach 200µm,which is the most important very long wavelength infrared astronomical detector.The ion implantation method greatly simplifies the fabrication process of the device,but it is easy to cause lattice damage,introduce crystalline defects,and lead to the increase of the dark current of detectors.Herein,the boron-doped germanium ion implantation process was studied,and the involved lattice damage mechanism was discussed.Experimental conditions involved using 80 keV energy for boron ion implantation,with doses ranging from 1×10^(13)cm^(-2)to 3×10^(15)cm^(-2).After implantation,thermal annealing at 450℃was implemented to optimize dopant activation and mitigate the effects of ion implantation.Various sophisticated characterization techniques,including X-ray dif⁃fraction(XRD),Raman spectroscopy,X-ray photoelectron spectroscopy(XPS),and secondary ion mass spec⁃trometry(SIMS)were used to clarify lattice damage.At lower doses,no notable structural alterations were ob⁃served.However,as the dosage increased,specific micro distortions became apparent,which could be attributed to point defects and residual strain.The created lattice damage was recovered by thermal treatment,however,an irreversible strain induced by implantation still existed at heavily dosed samples.展开更多
目的对比药物与支架植入术治疗特发性颅内高压伴静脉窦狭窄患者的疗效。方法回顾性分析2020年1月至2023年6月郑州大学第一附属医院收治的74例特发性颅内高压伴静脉窦狭窄患者的临床资料。采用单纯药物治疗(药物组)35例,支架植入术治疗(...目的对比药物与支架植入术治疗特发性颅内高压伴静脉窦狭窄患者的疗效。方法回顾性分析2020年1月至2023年6月郑州大学第一附属医院收治的74例特发性颅内高压伴静脉窦狭窄患者的临床资料。采用单纯药物治疗(药物组)35例,支架植入术治疗(支架组)39例。治疗前后均行腰椎穿刺术评估颅内压的改善情况,并行眼底检查评估视乳头水肿的改善情况。比较两组患者住院期间视乳头水肿Frisén分级中位数和腰椎穿刺开口压力平均值的变化。比较出院时、出院后6个月和12个月随访时临床症状的改善情况。观察随访期间两组患者的并发症发生情况。结果两组患者除支架组发病至治疗的时间较长(2 vs 1个月,P=0.021),其余基线资料差异均无统计学意义(均P>0.05)。两组患者治疗后均有不同程度的好转(均P>0.05)。但出院时支架组患者乳头水肿Frisén分级中位数更低(1 vs 2,P=0.011);腰椎穿刺开口压力(lumbar punctureopening pressure,LPOP)平均值更低(205.26 vs 248.14 mmH_(2)O,P=0.002)。出院时(74.4%vs 45.7%,P=0.017)、出院后6个月(84.6%vs 48.6%,P=0.001)、12个月(87.2%vs 57.1%,P=0.004)随访时支架组患者无症状和症状改善的患者比例更高。支架组并发症发生率略高,但差异无统计学意义(10.3%vs 8.6%,P=1.000)。结论与药物治疗相比,支架植入术治疗特发性颅内高压伴静脉窦狭窄患者能更快速有效地缓解视乳头水肿、腰椎穿刺开口压力及其相应症状和体征,改善患者预后且安全性相当。展开更多
目的评估人工耳蜗对单侧聋及不对称性听力损失(asymmetric hearing loss,AHL)患者听觉言语质量改善情况。方法选取首都医科大学附属北京同仁医院于2020年8月至2021年9月纳入的16例母语为汉语普通话的成人单侧聋及AHL人工耳蜗患者。其中...目的评估人工耳蜗对单侧聋及不对称性听力损失(asymmetric hearing loss,AHL)患者听觉言语质量改善情况。方法选取首都医科大学附属北京同仁医院于2020年8月至2021年9月纳入的16例母语为汉语普通话的成人单侧聋及AHL人工耳蜗患者。其中,男性8例,女性8例,年龄24~56岁,平均年龄36.9岁。单侧聋患者11例、AHL患者5例。采用言语、空间和音质听觉量表(speech,spatial and qualities of hearing scale,SSQ)评估上述患者在术前和开机两年言语感知、空间听觉和声音聆听质量的改善情况,并对各分量表得分变化进行比较。同时进一步比较单侧聋组和AHL组人工耳蜗术后听觉言语感知获益的差异。结果单侧聋和AHL患者人工耳蜗开机两年后SSQ总分及3个维度得分均较术前提高,且有统计学差异(P<0.05)。单侧聋及AHL患者在涉及言语理解的4个分量表助听前后得分均有显著性提高;在空间听觉方面,对定位、距离和移动的感知也有显著性改善;在声音聆听质量方面,听配能有显著性差异(Z=-2.70,P=0.004),但助听后声音聆听质量和自然度、识别声音和分离声音分量表得分有提高但无显著性差异。单侧聋组和AHL组患者人工耳蜗术后各维度得分的变化情况无显著性差异。结论人工耳蜗植入可帮助多数单侧聋和AHL患者提高言语空间听觉质量,减少听觉疲劳。展开更多
基金The project supported by National Natural Science Foundation of Chinapartly by USTC Foundation
文摘Buried Si<sub>3</sub>N<sub>4</sub> layer is formed by hitrogen ion implanted silicoh with high energy （400Key） and high dose (1×10<sup>18</sup>/cm<sup>2</sup>). The unimplanted single crystal zone is used as seed crystal. Seed inducing recrystallization is carried out by autoscanning Nd: YAG CW laser annealing. We got a large area SOI structure sample.
基金The Project Supported by Nationnl Natural Science Foundation of China
文摘As ion implanted damage of silicon was removed by Rapid ThermalAnnealing(RTA)using Model KST-1 RTA appakatus.Removal ofdamage and dopant redistribution were investigated by RutherfordBackscattering Spectra(RBS)and Extended Resistance.Sheet resistanceand carrier Hall mobility was mesaured by Van der Panw method.
文摘In this paper, damages and annealing effects of X,Y and Z cut LiNbO-3 implanted by 350keV high energy Ti (1.5 x 10<sup>17</sup> / cm<sup>2</sup>) are studied. The surface damages of X,Y cut plates are nearly amorphous, but the surface damage of Z cut does not reach saturation. Radiation damage is mainly due to Nb moving atoms and Ti atoms occupy the interstitial sites. By annealing the sample at 1000℃, most damage is removed from the boundary between implanted layer and LiNbO<sub>3</sub> base to surface.
文摘In this study,Mg-based composites,by the addition of ZnO,Ca_(2)ZnSi_(2)O_(7),Ca_(2)MgSi_(2)O_(7),and CaSiO_(3)as bioactive agents,were fabricated using friction stir processing.The microstructure and in vitro assessment of bioactivity,biodegradation rate,and corrosion behavior of the resultant composites were investigated in simulated body fluid(SBF).The results showed that during the immersion of composites in SBF for 28 d,due to the release of Ca^(2+)and PO_(4)^(3-)ions,hydroxyapatite(HA)crystals with cauliflower shaped morphology were deposited on the surface of composites,confirming good bioactivity of composites.In addition,due to the uniform distribution of bioceramic powders throughout Mg matrix,grain refinement of the Mg matrix,and uniform redistribution of secondary phase particles,the polarization resistance increased,and the biodegradation rate of composites significantly reduced compared to monolithic Mg matrix.The polarization corrosion resistance of Mg-ZnO increased from 0.216 to 2.499 kΩ/cm^(2)compared to monolithic Mg alloy.Additionally,Mg-ZnO composite with the weight loss of 0.0217 g after 28 d immersion showed lower weight loss compared to other samples with increasing immersion time.Moreover,Mg-ZnO composite with the biodegradation rate of 37.71 mm/a exhibited lower biodegradation rate compared to other samples with increasing immersion time.
基金Supported by National Key R&D Program of China(2023YFA1608701)National Natural Science Foundation of China(62274168,11933006,U2141240)Hangzhou Leading Innovation and Entrepreneurship Team(TD2020002)。
文摘The response wavelength of the blocked-impurity-band(BIB)structured infrared detector can reach 200µm,which is the most important very long wavelength infrared astronomical detector.The ion implantation method greatly simplifies the fabrication process of the device,but it is easy to cause lattice damage,introduce crystalline defects,and lead to the increase of the dark current of detectors.Herein,the boron-doped germanium ion implantation process was studied,and the involved lattice damage mechanism was discussed.Experimental conditions involved using 80 keV energy for boron ion implantation,with doses ranging from 1×10^(13)cm^(-2)to 3×10^(15)cm^(-2).After implantation,thermal annealing at 450℃was implemented to optimize dopant activation and mitigate the effects of ion implantation.Various sophisticated characterization techniques,including X-ray dif⁃fraction(XRD),Raman spectroscopy,X-ray photoelectron spectroscopy(XPS),and secondary ion mass spec⁃trometry(SIMS)were used to clarify lattice damage.At lower doses,no notable structural alterations were ob⁃served.However,as the dosage increased,specific micro distortions became apparent,which could be attributed to point defects and residual strain.The created lattice damage was recovered by thermal treatment,however,an irreversible strain induced by implantation still existed at heavily dosed samples.
文摘目的对比药物与支架植入术治疗特发性颅内高压伴静脉窦狭窄患者的疗效。方法回顾性分析2020年1月至2023年6月郑州大学第一附属医院收治的74例特发性颅内高压伴静脉窦狭窄患者的临床资料。采用单纯药物治疗(药物组)35例,支架植入术治疗(支架组)39例。治疗前后均行腰椎穿刺术评估颅内压的改善情况,并行眼底检查评估视乳头水肿的改善情况。比较两组患者住院期间视乳头水肿Frisén分级中位数和腰椎穿刺开口压力平均值的变化。比较出院时、出院后6个月和12个月随访时临床症状的改善情况。观察随访期间两组患者的并发症发生情况。结果两组患者除支架组发病至治疗的时间较长(2 vs 1个月,P=0.021),其余基线资料差异均无统计学意义(均P>0.05)。两组患者治疗后均有不同程度的好转(均P>0.05)。但出院时支架组患者乳头水肿Frisén分级中位数更低(1 vs 2,P=0.011);腰椎穿刺开口压力(lumbar punctureopening pressure,LPOP)平均值更低(205.26 vs 248.14 mmH_(2)O,P=0.002)。出院时(74.4%vs 45.7%,P=0.017)、出院后6个月(84.6%vs 48.6%,P=0.001)、12个月(87.2%vs 57.1%,P=0.004)随访时支架组患者无症状和症状改善的患者比例更高。支架组并发症发生率略高,但差异无统计学意义(10.3%vs 8.6%,P=1.000)。结论与药物治疗相比,支架植入术治疗特发性颅内高压伴静脉窦狭窄患者能更快速有效地缓解视乳头水肿、腰椎穿刺开口压力及其相应症状和体征,改善患者预后且安全性相当。
文摘目的评估人工耳蜗对单侧聋及不对称性听力损失(asymmetric hearing loss,AHL)患者听觉言语质量改善情况。方法选取首都医科大学附属北京同仁医院于2020年8月至2021年9月纳入的16例母语为汉语普通话的成人单侧聋及AHL人工耳蜗患者。其中,男性8例,女性8例,年龄24~56岁,平均年龄36.9岁。单侧聋患者11例、AHL患者5例。采用言语、空间和音质听觉量表(speech,spatial and qualities of hearing scale,SSQ)评估上述患者在术前和开机两年言语感知、空间听觉和声音聆听质量的改善情况,并对各分量表得分变化进行比较。同时进一步比较单侧聋组和AHL组人工耳蜗术后听觉言语感知获益的差异。结果单侧聋和AHL患者人工耳蜗开机两年后SSQ总分及3个维度得分均较术前提高,且有统计学差异(P<0.05)。单侧聋及AHL患者在涉及言语理解的4个分量表助听前后得分均有显著性提高;在空间听觉方面,对定位、距离和移动的感知也有显著性改善;在声音聆听质量方面,听配能有显著性差异(Z=-2.70,P=0.004),但助听后声音聆听质量和自然度、识别声音和分离声音分量表得分有提高但无显著性差异。单侧聋组和AHL组患者人工耳蜗术后各维度得分的变化情况无显著性差异。结论人工耳蜗植入可帮助多数单侧聋和AHL患者提高言语空间听觉质量,减少听觉疲劳。
