The perfect hybrid vector vortex beam(PHVVB)with helical phase wavefront structure has aroused significant concern in recent years,as its beam waist does not expand with the topological charge(TC).In this work,we inve...The perfect hybrid vector vortex beam(PHVVB)with helical phase wavefront structure has aroused significant concern in recent years,as its beam waist does not expand with the topological charge(TC).In this work,we investigate the spatial quantum coherent modulation effect with PHVVB based on the atomic medium,and we observe the absorption characteristic of the PHVVB with different TCs under variant magnetic fields.We find that the transmission spectrum linewidth of PHVVB can be effectively maintained regardless of the TC.Still,the width of transmission peaks increases slightly as the beam size expands in hot atomic vapor.This distinctive quantum coherence phenomenon,demonstrated by the interaction of an atomic medium with a hybrid vector-structured beam,might be anticipated to open up new opportunities for quantum coherence modulation and accurate magnetic field measurement.展开更多
Vector beams with spiral phase and spatially varying polarization profiles have many applications from optical micromanipulation to materials processing. Here, we propose and demonstrate an atomic spatial mode extract...Vector beams with spiral phase and spatially varying polarization profiles have many applications from optical micromanipulation to materials processing. Here, we propose and demonstrate an atomic spatial mode extracting scheme for the vector beam based on polarization-dependent absorption in the atom vapor. By employing the linear polarization pump beam which induces polarization sensitive absorption in the atomic ensemble, a counter-propagated weak probe vector beam is extracted by spatial absorption, and extracted part still maintains the original polarization and the vortex phase.The topological charges of the extracted mode are verified by interfering with the Gaussian beam, and it can be found that the orbital angular momentum is conserved in the extracting process. Our work will have potential applications in non-destructive spatial mode identification, and is also useful for studying higher-dimensional quantum information based on atomic ensembles.展开更多
Nine Chinese yak breeds （Maiwa, Tianzhu White, Qinghai Plateau, Sibu, Zhongdian, Pali, Tibetan High Mountain, Jiulong, and Xinjiang） and Gayal were analyzed by means of 16 microsatellite markers to determine the lev...Nine Chinese yak breeds （Maiwa, Tianzhu White, Qinghai Plateau, Sibu, Zhongdian, Pali, Tibetan High Mountain, Jiulong, and Xinjiang） and Gayal were analyzed by means of 16 microsatellite markers to determine the level of genetic variation within populations, genetic relationship between populations, and population structure for each breed. A total of 206 microsatellite alleles were observed. Mean F-statistics （0.056） for 9 yak breeds indicated that 94.4% of the genetic variation was observed within yak breeds and 5.6% of the genetic variation existed amongst breeds. The Neighbor-Joining phylogenetic tree was constructed based on Nei＇s standard genetic distances and two clusters were obtained. The Gayal separated from the yaks far away and formed one cluster and 9 yak breeds were grouped together. The analysis of population structure for 9 yak breeds and the Gayal showed that they resulted in four clusters; one cluster includes yaks from Tibet Autonomous Region and Qinghai Province, one cluster combines Zhongdian, Maiwa, and Tianzhu White, and Jiulong and Xinjiang come into the third cluster. Pali was mainly in the first cluster （90%）, Jiulong was mainly in the second cluster （87.1%）, Zhongdian was primarily in the third cluster （83%）, and the other yak breeds were distributed in two to three clusters. The Gayal was positively left in the fourth cluster （99.3%）.展开更多
目的:研究促结缔组织增生性小圆细胞肿瘤(desmoplastic small round cell tumor,DSRCT)的临床病理特征。方法:回顾性分析2012年1月至2019年11月7例首都医科大学附属北京世纪坛医院诊断的DSRCT临床资料,复阅病理切片,并行免疫组织化学法...目的:研究促结缔组织增生性小圆细胞肿瘤(desmoplastic small round cell tumor,DSRCT)的临床病理特征。方法:回顾性分析2012年1月至2019年11月7例首都医科大学附属北京世纪坛医院诊断的DSRCT临床资料,复阅病理切片,并行免疫组织化学法及荧光原位杂交法(fluorescence in situ hybridization,FISH)检测,总结病理特征。结果:患者均为男性,中位年龄29岁,部位均为腹腔,临床症状包括腹胀腹痛、腹水、大便习惯改变、排尿困难。病理大体上表现为大网膜或肠系膜多发灰白结节,组织学上表现为大小不一、形态不规则的小圆细胞巢及增生的纤维结缔组织。免疫组织化学法检测显示肿瘤细胞中的Desmin和Vimentin呈核旁点灶状阳性表达,FISH检测EWSR1-WT1融合基因阳性。中位随访期为15个月,6例生存,1例死亡。结论:DSRCT发病率低,高度恶性,Desmin和Vimentin核旁点灶状阳性表达具有提示意义,EWSR1-WT1融合基因阳性具有确诊意义。展开更多
Genome-wide association studies(GWAS)have identified multiple single nucleotide polymorphisms(SNPs)or small indels robustly associated with schizophrenia;however,the functional risk variations remain largely unknown.W...Genome-wide association studies(GWAS)have identified multiple single nucleotide polymorphisms(SNPs)or small indels robustly associated with schizophrenia;however,the functional risk variations remain largely unknown.We investigated the 10q24.32 locus and discovered a 339 bp Alu insertion polymorphism(rs71389983)in complete linkage disequilibrium(LD)with the schizophrenia GWAS risk variant rs7914558.The presence of the Alu insertion at rs71389983 strongly repressed transcriptional activities in in vitro luciferase assays.This polymorphism may be a target for future mechanistic research.Our study also underlines the importance and necessity of considering previously underestimated Alu polymorphisms in future genetic studies of schizophrenia.展开更多
Ni-based anodes of SOFCs are susceptible to coking, which greatly limits practical application of direct methane-based fuels. An indirect internal reformer is an effective way to convert methane-based fuels into synga...Ni-based anodes of SOFCs are susceptible to coking, which greatly limits practical application of direct methane-based fuels. An indirect internal reformer is an effective way to convert methane-based fuels into syngas before they reach anode. In this work, catalytic activity of a redox-stable perovskite La0.7Sr0.3Cr0.8Fe0.2O3-δ(LSCrFO) for methane conversion was evaluated. The catalyst was fabricated as an anodic protective layer to improve coking resistance of a Ni cermet anode. Using wet CH4 as a fuel, the LSCrFO-modified cell showed excellent power output and good coking resistance with peak power density of 1.59 W cm-2 at 800℃. The cell demonstrated good durability lasting for at least 100 h. While the bare cell without the protective layer showed poor durability with the cell voltage fast dropped from 0.75 V to 0.4 V within 30 min. Under wet coal bed methane (CBM) operation, obvious performance degradation within 35 h (1.7 mV h^-1) was observed due to the influence of heavy carbon compounds in CBM. The pre-and post-mortem microstructures and carbon analysis of the anode surface and catalyst surface were further conducted.展开更多
基金Project supported by the Youth Innovation Promotion Association CASState Key Laboratory of Transient Optics and Photonics Open Topics (Grant No. SKLST202222)
文摘The perfect hybrid vector vortex beam(PHVVB)with helical phase wavefront structure has aroused significant concern in recent years,as its beam waist does not expand with the topological charge(TC).In this work,we investigate the spatial quantum coherent modulation effect with PHVVB based on the atomic medium,and we observe the absorption characteristic of the PHVVB with different TCs under variant magnetic fields.We find that the transmission spectrum linewidth of PHVVB can be effectively maintained regardless of the TC.Still,the width of transmission peaks increases slightly as the beam size expands in hot atomic vapor.This distinctive quantum coherence phenomenon,demonstrated by the interaction of an atomic medium with a hybrid vector-structured beam,might be anticipated to open up new opportunities for quantum coherence modulation and accurate magnetic field measurement.
文摘目的:探讨恶性腹膜间皮瘤(malignant peritoneal mesothelioma,MPM)临床病理特点及预后,寻找影响预后独立指标。方法:收集首都医科大学附属北京世纪坛医院2013年1月至2021年12月手术的100例MPM病例,研究石棉接触、CA125、腹水、腹膜癌指数(peritoneal cancer index,PCI)评分、完全细胞减灭(completeness of cytoreduction,CC)评分、TNM分期、组织学分型、脉管瘤栓、神经侵犯、Ki-67指数,收集随访资料。采用Kaplan-Meier法计算患者生存率;生存预后模型进行单因素和多因素分析,研究独立影响MPM预后的临床病理学因素。结果:本研究男性48例(48%),女性52例(52%),中位年龄54(24~72)岁,有石棉接触史患者19例(19%),腹水患者90例(90%),CA125≥35 U/mL 58例(59%),PCI评分≥25分56例(56%)、CC评分为0~1分49例(49%)、2~3分51例(51%)。上皮样型79例(79%),非上皮样型21例(21%),Ⅰ期患者10例(10%)、Ⅱ期和Ⅲ期患者均为45例(45%)。单因素分析发现影响患者生存主要指标:石棉接触、PCI评分、CA125、组织学类型、Ki-67指数、TNM分期。多因素分析显示,有石棉接触史患者死亡风险是无接触史患者的2.3倍(95%CI:0.233~0.806,P=0.008),PCI评分≥25分患者的死亡风险是<25分患者的2.9倍(95%CI:0.200~0.612,P<0.001),Ki-67指数>10%患者死亡风险是指数≤10%患者的5.90倍(95%CI:0.072~0.401,P<0.001)。上皮样型与非上皮样型MPM的Ki-67指数呈显著性差异(P=0.001)。结论:石棉接触史、PCI评分和Ki-67指数是MPM的独立预后因子。
文摘Vector beams with spiral phase and spatially varying polarization profiles have many applications from optical micromanipulation to materials processing. Here, we propose and demonstrate an atomic spatial mode extracting scheme for the vector beam based on polarization-dependent absorption in the atom vapor. By employing the linear polarization pump beam which induces polarization sensitive absorption in the atomic ensemble, a counter-propagated weak probe vector beam is extracted by spatial absorption, and extracted part still maintains the original polarization and the vortex phase.The topological charges of the extracted mode are verified by interfering with the Gaussian beam, and it can be found that the orbital angular momentum is conserved in the extracting process. Our work will have potential applications in non-destructive spatial mode identification, and is also useful for studying higher-dimensional quantum information based on atomic ensembles.
基金Project(11264024)supported by the National Natural Science Foundation of ChinaProjects(2015MS0102,2015MS0524)supported by Natural Science Foundation of Inner Mongolia,China
文摘Nine Chinese yak breeds （Maiwa, Tianzhu White, Qinghai Plateau, Sibu, Zhongdian, Pali, Tibetan High Mountain, Jiulong, and Xinjiang） and Gayal were analyzed by means of 16 microsatellite markers to determine the level of genetic variation within populations, genetic relationship between populations, and population structure for each breed. A total of 206 microsatellite alleles were observed. Mean F-statistics （0.056） for 9 yak breeds indicated that 94.4% of the genetic variation was observed within yak breeds and 5.6% of the genetic variation existed amongst breeds. The Neighbor-Joining phylogenetic tree was constructed based on Nei＇s standard genetic distances and two clusters were obtained. The Gayal separated from the yaks far away and formed one cluster and 9 yak breeds were grouped together. The analysis of population structure for 9 yak breeds and the Gayal showed that they resulted in four clusters; one cluster includes yaks from Tibet Autonomous Region and Qinghai Province, one cluster combines Zhongdian, Maiwa, and Tianzhu White, and Jiulong and Xinjiang come into the third cluster. Pali was mainly in the first cluster （90%）, Jiulong was mainly in the second cluster （87.1%）, Zhongdian was primarily in the third cluster （83%）, and the other yak breeds were distributed in two to three clusters. The Gayal was positively left in the fourth cluster （99.3%）.
文摘目的:研究促结缔组织增生性小圆细胞肿瘤(desmoplastic small round cell tumor,DSRCT)的临床病理特征。方法:回顾性分析2012年1月至2019年11月7例首都医科大学附属北京世纪坛医院诊断的DSRCT临床资料,复阅病理切片,并行免疫组织化学法及荧光原位杂交法(fluorescence in situ hybridization,FISH)检测,总结病理特征。结果:患者均为男性,中位年龄29岁,部位均为腹腔,临床症状包括腹胀腹痛、腹水、大便习惯改变、排尿困难。病理大体上表现为大网膜或肠系膜多发灰白结节,组织学上表现为大小不一、形态不规则的小圆细胞巢及增生的纤维结缔组织。免疫组织化学法检测显示肿瘤细胞中的Desmin和Vimentin呈核旁点灶状阳性表达,FISH检测EWSR1-WT1融合基因阳性。中位随访期为15个月,6例生存,1例死亡。结论:DSRCT发病率低,高度恶性,Desmin和Vimentin核旁点灶状阳性表达具有提示意义,EWSR1-WT1融合基因阳性具有确诊意义。
基金supported by grants from Yunnan Applied Basic Research Projects(2018FB051 to X.X.and 2018FB136to H.C.)Hubei Province Health and Family Planning Scientific Research Project(WJ2015Q033 to N.Q.)+2 种基金Population and Family Planning Commission of Wuhan(WX14B34 to N.Q.)Open Program of Henan Key Laboratory of Biological Psychiatry(ZDSYS2018001 to H.C.)Program for Scientific Research of Yunnan Health and Family Planning Commission(2016NS025 to H.Y.J.)
文摘Genome-wide association studies(GWAS)have identified multiple single nucleotide polymorphisms(SNPs)or small indels robustly associated with schizophrenia;however,the functional risk variations remain largely unknown.We investigated the 10q24.32 locus and discovered a 339 bp Alu insertion polymorphism(rs71389983)in complete linkage disequilibrium(LD)with the schizophrenia GWAS risk variant rs7914558.The presence of the Alu insertion at rs71389983 strongly repressed transcriptional activities in in vitro luciferase assays.This polymorphism may be a target for future mechanistic research.Our study also underlines the importance and necessity of considering previously underestimated Alu polymorphisms in future genetic studies of schizophrenia.
基金supported by the Coal Seam Gas Joint Foundation of Shanxi(2015012016)Shanxi Province Science Foundation(2016011025)+2 种基金Shanxi Scholarship Council of China(2016-010)Shanxi “1331 Project” Key Innovative Research Team(“1331KIRT”)the Open Funding from State Key Laboratory of Materialoriented Chemical Engineering(No.KL16-03)
文摘Ni-based anodes of SOFCs are susceptible to coking, which greatly limits practical application of direct methane-based fuels. An indirect internal reformer is an effective way to convert methane-based fuels into syngas before they reach anode. In this work, catalytic activity of a redox-stable perovskite La0.7Sr0.3Cr0.8Fe0.2O3-δ(LSCrFO) for methane conversion was evaluated. The catalyst was fabricated as an anodic protective layer to improve coking resistance of a Ni cermet anode. Using wet CH4 as a fuel, the LSCrFO-modified cell showed excellent power output and good coking resistance with peak power density of 1.59 W cm-2 at 800℃. The cell demonstrated good durability lasting for at least 100 h. While the bare cell without the protective layer showed poor durability with the cell voltage fast dropped from 0.75 V to 0.4 V within 30 min. Under wet coal bed methane (CBM) operation, obvious performance degradation within 35 h (1.7 mV h^-1) was observed due to the influence of heavy carbon compounds in CBM. The pre-and post-mortem microstructures and carbon analysis of the anode surface and catalyst surface were further conducted.
