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Discrete multi-step phase hologram for high frequency acoustic modulation
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作者 周梦晴 李照希 +6 位作者 李怡 王业成 张娟 谌东东 全熠 杨银堂 费春龙 《Chinese Physics B》 SCIE EI CAS CSCD 2024年第1期488-495,共8页
Acoustic holograms can recover wavefront stored acoustic field information and produce high-fidelity complex acoustic fields. Benefiting from the huge spatial information that traditional acoustic elements cannot matc... Acoustic holograms can recover wavefront stored acoustic field information and produce high-fidelity complex acoustic fields. Benefiting from the huge spatial information that traditional acoustic elements cannot match, acoustic holograms pursue the realization of high-resolution complex acoustic fields and gradually tend to high-frequency ultrasound applications. However, conventional continuous phase holograms are limited by three-dimensional(3D) printing size, and the presence of unavoidable small printing errors makes it difficult to achieve acoustic field reconstruction at high frequency accuracy. Here, we present an optimized discrete multi-step phase hologram. It can ensure the reconstruction quality of image with high robustness, and properly lower the requirement for the 3D printing accuracy. Meanwhile, the concept of reconstruction similarity is proposed to refine a measure of acoustic field quality. In addition, the realized complex acoustic field at 20 MHz promotes the application of acoustic holograms at high frequencies and provides a new way to generate high-fidelity acoustic fields. 展开更多
关键词 discrete multi-step phase hologram econstruction quality 3D printing accuracy high-fidelity
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Exploring the Evolutionary Path of Digital Financial Inclusion in Guangdong Province,China
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作者 juan zhang 《Proceedings of Business and Economic Studies》 2024年第1期16-26,共11页
This study explores the development trajectory of digital financial inclusion in 21 cities in Guangdong Province through fuzzy-set qualitative comparative analysis(fsQCA).The findings emphasize that the success of dig... This study explores the development trajectory of digital financial inclusion in 21 cities in Guangdong Province through fuzzy-set qualitative comparative analysis(fsQCA).The findings emphasize that the success of digital financial inclusion goes beyond individual dimensions,forming a systematic initiative marked by multifaceted interaction among different disciplines.In the trajectory of high-level digital inclusive finance development,the study identifies economic prosperity and technological innovation as crucial elements,highlighting their centrality,and elucidates the synergistic collaboration between market mechanisms and government guidance.Furthermore,the study emphasizes the government’s pivotal role in supporting market mechanisms and guiding policies,highlighting the need to achieve a nuanced equilibrium in the digital financial inclusion strategy.In contrast,non-high-level development paths of digital inclusive finance show a spectrum of diversities,emphasizing the critical roles played by economic fundamentals,government regulation,market mechanisms,and other contextual factors in different trajectories.Regarding policy implications,the study emphasizes the comprehensive and systemic nature inherent in the development of digital inclusive finance.It proposes four policy recommendations,including integrating development strategies,emphasizing scientific and technological innovation and economic development,achieving a delicate balance between market mechanisms and government guidance,and providing precise policy support.These insights provide valuable lessons for shaping digital inclusive financial policies in Guangdong Province and beyond,offering profound insights for strategically constructing robust digital financial ecosystems. 展开更多
关键词 Digital inclusive finance Impact pathways Economic development level Technological innovation Fuzzy-set qualitative comparative analysis(fsQCA)
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混合教学模式在仪器分析课程中的实践运用——以“气相色谱分析法”为例 被引量:5
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作者 张娟 刘庆普 +3 位作者 雷敬卫 谢彩侠 纪永升 麻秋娟 《大学化学》 CAS 2023年第5期13-20,共8页
在仪器分析课程中设计混合教学模式,包含前端分析、课前线上学习、线上线下联结、线下课堂教学、课后指导、学习评价。以“气相色谱分析法”为例,通过全面分析学情、梳理教学内容、设计线上线下教学过程、突出过程性学习评价,充分探究... 在仪器分析课程中设计混合教学模式,包含前端分析、课前线上学习、线上线下联结、线下课堂教学、课后指导、学习评价。以“气相色谱分析法”为例,通过全面分析学情、梳理教学内容、设计线上线下教学过程、突出过程性学习评价,充分探究混合教学模式在仪器分析课程中的实践运用。通过教学反思,探讨混合教学模式的应用优势及存在问题。 展开更多
关键词 仪器分析 混合教学 气相色谱分析法 教学实践
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DNA损伤修复基因胚系突变乳腺癌新辅助化疗疗效分析 被引量:2
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作者 刘婧思 陈久安 +4 位作者 孙洁 姚璐 张娟 解云涛 徐晔 《中国肿瘤临床》 CAS CSCD 北大核心 2023年第10期497-503,共7页
目的:分析携带DNA损伤修复(DNA damage repair,DDR)相关基因突变的乳腺癌患者对基础蒽环类新辅助化疗方案(anthracycline,A)、蒽环联合紫杉类新辅助化疗方案(anthracycline-taxane,A-T)、蒽环联合紫杉和铂类新辅助化疗方案(anthracyclin... 目的:分析携带DNA损伤修复(DNA damage repair,DDR)相关基因突变的乳腺癌患者对基础蒽环类新辅助化疗方案(anthracycline,A)、蒽环联合紫杉类新辅助化疗方案(anthracycline-taxane,A-T)、蒽环联合紫杉和铂类新辅助化疗方案(anthracycline-taxane/carboplatin,A-TP)的疗效反应。方法:2003年10月至2015年5月,105例携带DDR基因胚系突变(非BRCA)的原发性乳腺癌患者在北京大学肿瘤医院分别接受A(n=69)、A-T(n=19)、A-TP(n=17)3种新辅助化疗方案。通过χ2检验或Fisher精确检验比较3组患者的病理完全缓解(pathological complete remission,pCR)率;采用Kaplan-Meier生存分析和Cox回归模型分析患者的乳腺癌特异生存(breast cancer-specific survival,BCSS)及无复发生存(recurrence-free survival,RFS)。结果:93.3%(98/105)的患者接受了4~8个周期的新辅助化疗。接受A、A-T、A-TP新辅助方案的3组患者的pCR率分别为11.6%、21.1%和35.3%。A-TP组pCR率显著高于A组(P=0.028),A-TP组pCR率也高于A-T组,但未达到统计学差异。经过65.6个月的中位随访,A-TP组的BCSS(HR=0.50,95%CI:0.09~2.73,P=0.41)和RFS(HR=0.51,95%CI:0.15~1.74,P=0.27)略优于A-T组,但无统计学差异。结论:DDR基因胚系突变患者应用A-TP新辅助化疗方案可显著提高pCR率,加入铂类药物或可提高患者的药物反应性及预后。 展开更多
关键词 乳腺癌 DNA 损伤修复基因 新辅助化疗 病理完全缓解
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ZmMs33 promotes anther elongation via modulating cell elongation regulators,metabolic homeostasis,and cell wall remodeling in maize
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作者 Ziwen Li Taotao Zhu +7 位作者 Shuangshuang Liu Lina Zhao Xueli An Yan Long Xun Wei juan zhang Zhenying Dong Xiangyuan Wan 《The Crop Journal》 SCIE CSCD 2023年第2期361-373,共13页
Plant cell elongation depends on well-defined gene regulations,adequate nutrients,and timely cell wall modifications.Anther size is positively correlated with the number and viability of pollen grains,while little is ... Plant cell elongation depends on well-defined gene regulations,adequate nutrients,and timely cell wall modifications.Anther size is positively correlated with the number and viability of pollen grains,while little is known about molecular mechanisms underlying anther cell elongation.Here,we found that properly activated cell elongation regulators at transcriptional levels in loss-of-function ZmMs33 mutant(ms33-6038)anthers failed to promote maize anther elongation.ZmMs33 deficiency disrupted metabolic homeostasis mainly by inhibiting both photosynthesis in anther endothecium and lipid accumulation in anther tapetum.Importantly,ms33-6038 anthers displayed ectopic,premature and excessive secondary cell wall thickening in anther middle layer,which constrained cell elongation structurally and blocked nutrient flows across different anther wall layers.The metabolic disorder was only found in ms33-6038 mutant rather than several representative male-sterility lines at transcriptional and post-translational levels.Collectively,the disordered metabolisms and blocked nutrient flows defeated the activated cell elongation regulators,and finally inhibited anther elongation and growth with a unique‘‘idling effect”in ms33-6038 mutant. 展开更多
关键词 ZmMS33 Anther cell elongation Metabolic homeostasis Secondary cell wall thickening Male sterility MAIZE
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Contamination and human health risk assessment of heavy metal(loid)s in topsoil and groundwater around mining and dressing factories in Chifeng,North China
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作者 Di Zhao Qiang Wu +9 位作者 Yifan Zeng juan zhang Aoshuang Mei Xiaohui zhang Shuai Gao Hanyuan Wang Honglei Liu Yong zhang Shuai Qi Xu Jia 《International Journal of Coal Science & Technology》 EI CAS CSCD 2023年第1期33-47,共15页
Chifeng is a concentrated mining area for non-ferrous metal minerals,as well as a key prevention and control area for heavyduty enterprises.This situation necessitates an efective ecological and human health risk asse... Chifeng is a concentrated mining area for non-ferrous metal minerals,as well as a key prevention and control area for heavyduty enterprises.This situation necessitates an efective ecological and human health risk assessment of heavy metal(loid)s driven by the wide distribution of metal ore processing,mining,and smelting factories in Hexigten Banner and Bairin Left Banner.We conducted surveys to assess the levels of heavy metal(loid)s(Cr,As,Pb,Cd,and Hg)in the topsoil and groundwater of the areas.The results indicated that the concentrations of As,Cd,and Pb in partial soil samples exceeded the environmental quality standards of Grade II.Based on contamination assessments,such as geoaccumulation indices and pollution indices,we inferred that Cd,Pb,and As were primary pollutants in topsoil.Potential ecological risks when considered as part of the average risk indices(RI)are up to 1626.40 and 2818.76,respectively,in the two areas.Comparative analysis revealed that Cd posed a very high potential ecological risk,followed by As.Moreover,the evaluation showed that the three exposure pathways of carcinogenic and non-carcinogenic risk followed a descending order:inhalation>ingestion>dermal contact,except for Pb.Arsenic in topsoil posed a potential non-carcinogenic risk to human health,while there were no adverse efects of As in groundwater.In addition,the average total carcinogenic risk for As in the two areas,as well as the risk of Pb in the topsoil of Bairin Left Banner and all the fve heavy metal(loid)s in groundwater,exceeded human tolerance.Pb–Zn mines caused higher human health risks.In addition,the tandem contamination of heavy metal(loid)s in soil and groundwater was not obvious.This research study provides a basis for pollution remediation to control heavy industry-induced ecological and health risks of heavy metal(loid)s. 展开更多
关键词 Heavy metal(loid)s Contamination indices Ecological risks Human health risks Chifeng
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Cancer risk in relatives of BRCA1/2 pathogenic variant carriers in a large series of unselected patients with breast cancer
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作者 Jiaming Liu Lu Yao +5 位作者 Jie Sun Li Hu Jiuan Chen juan zhang Ye Xu Yuntao Xie 《Cancer Biology & Medicine》 SCIE CAS CSCD 2023年第2期147-154,共8页
Objective:The spectrum and risk of cancer in relatives of BRCA1/2 pathogenic variant carriers in the Chinese population have not been established.Methods:A family history of cancer in 9903 unselected breast cancer pat... Objective:The spectrum and risk of cancer in relatives of BRCA1/2 pathogenic variant carriers in the Chinese population have not been established.Methods:A family history of cancer in 9903 unselected breast cancer patients was retrospectively analyzed.BRCA1/2 status was determined for all patients and relative risks(RRs)were calculated to evaluate cancer risk in relatives of the patients.Results:The incidences of breast cancer in female relatives of BRCA1 carriers,BRCA2 carriers,and non-carriers were 33.0%,32.2%,and 7.7%,respectively.The corresponding incidences of ovarian cancer were 11.5%,2.4%,and 0.5%,respectively.The incidences of pancreatic cancer in male relatives of BRCA1 carriers,BRCA2 carriers,and non-carriers were 1.4%,2.7%,and 0.6%,respectively.The corresponding incidences of prostate cancer were 1.0%,2.1%,and 0.4%,respectively.The risks of breast and ovarian cancers in female relatives of BRCA1 and BRCA2 carriers were significantly higher than female relatives of non-carriers(BRCA1:RR=4.29,P<0.001 and RR=21.95,P<0.001;BRCA2:RR=4.19,P<0.001 and RR=4.65,P<0.001,respectively).Additionally,higher risks of pancreatic and prostate cancers were noted in male relatives of BRCA2 carriers than non-carriers(RR=4.34,P=0.001 and RR=4.86,P=0.001,respectively).Conclusions:Female relatives of BRCA1 and BRCA2 carriers are at increased risk for breast and ovarian cancers,and male relatives of BRCA2 carriers are at increased risk for pancreatic and prostate cancers. 展开更多
关键词 BRCA1 variant BRCA2 variant cancer risk in relatives Chinese breast cancer patients family history of cancer
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Optimizing band structure of CoP nanoparticles via rich-defect carbon shell toward bifunctional electrocatalysts for overall water splitting
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作者 Juncheng Wu Zhe‐Fan Wang +7 位作者 Taotao Guan Guoli zhang juan zhang Jie Han Shengqin Guan Ning Wang Jianlong Wang Kaixi Li 《Carbon Energy》 SCIE CSCD 2023年第3期112-125,共14页
Transition-metal phosphides(TMPs)with high catalytic activity are widely used in the design of electrodes for water splitting.However,a major challenge is how to achieve the trade-off between activity and stability of... Transition-metal phosphides(TMPs)with high catalytic activity are widely used in the design of electrodes for water splitting.However,a major challenge is how to achieve the trade-off between activity and stability of TMPs.Herein,a novel method for synthesizing CoP nanoparticles encapsu-lated in a rich-defect carbon shell(CoP/DCS)is developed through the self-assembly of modified polycyclic aromatic molecules.The graft and removal of high-activity C-N bonds of aromatic molecules render the controllable design of crystallite defects of carbon shell.The density functional theory calculation indicates that the carbon defects with unpaired electrons could effectively tailor the band structure of CoP.Benefiting from the improved activity and corrosion resistance,the CoP/DCS delivers outstanding difunctional hydrogen evolution reaction(88 mV)and oxygen evolution reaction(251 mV)performances at 10 mA cm^(−2)current density.Furthermore,the coupled water electrolyzer with CoP/DCS as both the cathode and anode presents ultralow cell voltages of 1.49 V to achieve 10 mA cm^(−2)with long-time stability.This strategy to improve TMPs electrocatalyst with rich-DCS and heterogeneous structure will inspire the design of other transition metal compound electrocatalysts for water splitting. 展开更多
关键词 band structure bifunctional electrocatalysts CoP nanoparticles overall water splitting rich‐defect carbon
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化妆品中防腐剂的应用现状及检测技术研究进展
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作者 朱海荣 孙胜敏 +3 位作者 张娟 刘爽 刘倩倩 邹惠玲 《日用化学工业(中英文)》 CAS 北大核心 2023年第6期679-685,共7页
化妆品中的防腐剂在抑制微生物生长、延长产品保质期方面发挥了重要作用,但其使用不当会损害人体健康并对环境和生态安全造成潜在危害。随着化妆品安全事件的频发,居民消费安全意识的提升和行业监管法规趋严,防腐剂的添加状况成为社会... 化妆品中的防腐剂在抑制微生物生长、延长产品保质期方面发挥了重要作用,但其使用不当会损害人体健康并对环境和生态安全造成潜在危害。随着化妆品安全事件的频发,居民消费安全意识的提升和行业监管法规趋严,防腐剂的添加状况成为社会各界的关注焦点。文章总结了当前化妆品中防腐剂的使用现状,梳理了近年来常规检测技术在化妆品中防腐剂领域的最新应用,介绍了高效液相色谱-电感耦合等离子体质谱法和激光解吸附离子化质谱等新型检测手段。分析了化妆品中防腐剂的市场发展前景和检测技术发展方向,为今后化妆品中防腐剂的监管和高通量快速检测提供借鉴。 展开更多
关键词 化妆品 防腐剂 应用 检测技术
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Association of traditional Chinese exercises with glycemic responses in people with type 2 diabetes:A systematic review and meta-analysis of randomized controlled trials 被引量:3
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作者 ge song changcheng chen +3 位作者 juan zhang lin chang dong zhu xueqiang wang 《Journal of Sport and Health Science》 SCIE 2018年第4期442-452,共11页
Background: There is increasing evidence showing the health benefits of various forms of traditional Chinese exercises(TCEs) on the glycemic profile in people with type 2 diabetes. However, relatively little is known ... Background: There is increasing evidence showing the health benefits of various forms of traditional Chinese exercises(TCEs) on the glycemic profile in people with type 2 diabetes. However, relatively little is known about the combined clinical effectiveness of these traditional exercises.This study was designed to perform a systematic review and meta-analysis of the overall effect of 3 common TCEs(Tai Ji Quan, Qigong, Ba Duan Jin) on glycemic control in adults with type 2 diabetes.Methods: We conducted an extensive database search in Cochrane Library, EMBASE, Pub Med, Web of Science, EBSCO, and China National Knowledge Infrastructure on randomized controlled trials published between April 1967 and September 2017 that compared any of the 3 TCEs with a control or comparison group on glycemic control. Data extraction was performed by 2 independent reviewers. Study quality was evaluated using the Cochrane Handbook for Systematic Reviews of Interventions, which assessed the risk of bias, including sequence generation, allocation concealment, blinding, completeness of outcome data, and selective outcome reporting. The resulting quality of the reviewed studies was characterized in 3 grades representing the level of bias: low, unclear, and high. All analyses were performed using random effects models and heterogeneity was quantified. We a priori specified changes in biomarkers of hemoglobin A1 c(in percentage) and fasting blood glucose(mmol/L) as the main outcomes and triglycerides, total cholesterol, low-density lipoprotein cholesterol, high-density lipoprotein-cholesterol, 2-h plasma glucose, and fasting plasma glucose as secondary outcomes.Results: A total of 39 randomized, controlled trials(Tai Ji Quan = 11; Qigong = 6; Ba Duan Jin = 22) with 2917 type 2 diabetic patients(aged41à80 years) were identified. Compared with a control or comparison group, pooled meta-analyses of TCEs showed a significant decrease in hemoglobin A1 c(mean difference(MD) = ?0.67%; 95% confidence interval(CI): ?0.86% to ?0.48%; p < 0.00001) and fasting blood glucose(MD = ?0.66 mmol/L; 95%CI: ?0.95 to ?0.37 mmol/L; p < 0.0001). The observed effect was more pronounced for interventions that were medium range in duration(i.e., >3à<12 months). TCE interventions also showed improvements in the secondary outcome measures. A high risk of bias was observed in the areas of blinding(i.e., study participants and personnel, and outcome assessment).Conclusion: Among patients with type 2 diabetes, TCEs were associated with significantly lower hemoglobin A1 c and fasting blood glucose.Further studies to better understand the dose and duration of exposure to TCEs are warranted. 展开更多
关键词 繁体中文 糖尿病 随机化 控制 类型 评论 系统 试用
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Red cell distribution width: A predictor of the severity of hypertriglyceridemia-induced acute pancreatitis
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作者 Yong-Cai Lv Yan-Hua Yao +2 位作者 juan zhang Yu-Jie Wang Jing-Jing Lei 《World Journal of Experimental Medicine》 2023年第5期115-122,共8页
BACKGROUND Compared with patients with other causes of acute pancreatitis,those with hypertriglyceridemia-induced acute pancreatitis(HTG-AP)are more likely to develop persistent organ failure(POF).Therefore,recognizin... BACKGROUND Compared with patients with other causes of acute pancreatitis,those with hypertriglyceridemia-induced acute pancreatitis(HTG-AP)are more likely to develop persistent organ failure(POF).Therefore,recognizing the individuals at risk of developing POF early in the HTG-AP process is a vital for improving outcomes.Bedside index for severity in acute pancreatitis(BISAP),a simple parameter that is obtained 24 h after admission,is an ideal index to predict HTG-AP severity;however,the suboptimal sensitivity limits its clinical application.Hence,current clinical scoring systems and biochemical parameters are not sufficient for predicting HTG-AP severity.AIM To elucidate the early predictive value of red cell distribution width(RDW)for POF in HTG-AP.METHODS In total,102 patients with HTG-AP were retrospectively enrolled.Demographic and clinical data,including RDW,were collected from all patients on admission.RESULTS Based on the Revised Atlanta Classification,37(33%)of 102 patients with HTG-AP were diagnosed with POF.On admission,RDW was significantly higher in patients with HTG-AP and POF than in those without POF(14.4%vs 12.5%,P<0.001).The receiver operating characteristic curve demonstrated a good discrim-inative power of RDW for POF with a cutoff of 13.1%,where the area under the curve(AUC),sensitivity,and specificity were 0.85,82.4%,and 77.9%,respectively.When the RDW was≥13.1%and one point was added to the original BISAP to obtain a new BISAP score,we achieved a higher AUC,sensitivity,and specificity of 0.89,91.2%,and 67.6%,respectively.CONCLUSION RDW is a promising predictor of POF in patients with HTG-AP,and the addition of RDW can promote the sensitivity of BISAP. 展开更多
关键词 Red cell distribution width Bedside index for severity in acute pancreatitis Persistent organ failure Hypertriglyceridemia-induced acute pancreatitis
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冷圈套切除术治疗≤1.0cm结直肠息肉的有效性和安全性 被引量:17
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作者 曹婷婷 陶国全 +3 位作者 杨晓钟 张娟 孙素华 戴伟杰 《中国内镜杂志》 2021年第5期1-6,共6页
目的探讨冷圈套切除术(CSP)与热圈套切除术(HSP)治疗直径≤1.0 cm结直肠息肉的有效性和安全性。方法选取2018年6月-2020年3月南京医科大学附属淮安第一医院因结直肠息肉(直径≤1.0 cm)行内镜下切除治疗的1403例患者作为研究对象,分为CSP... 目的探讨冷圈套切除术(CSP)与热圈套切除术(HSP)治疗直径≤1.0 cm结直肠息肉的有效性和安全性。方法选取2018年6月-2020年3月南京医科大学附属淮安第一医院因结直肠息肉(直径≤1.0 cm)行内镜下切除治疗的1403例患者作为研究对象,分为CSP组(n=213)和HSP组(n=1190),比较两组钛夹使用、出血穿孔发生率、术后内镜下止血率和组织学完整切除率等。结果HSP组术后迟发性出血发生率明显高于CSP组(4.9%和0.9%,P=0.003)。HSP组有5例发生术后迟发性穿孔,而CSP组无1例。CSP组息肉组织完整切除率为95.8%(204/213),与HSP组的97.6%(1162/1190)比较,差异无统计学意义。结论CSP治疗直径≤1.0 cm的结直肠息肉术后出血风险低,钛夹使用数少,术后内镜下止血率低,而组织学完整切除率与HSP接近,是一种安全、有效的治疗方式。 展开更多
关键词 结直肠息肉 冷圈套切除术 热圈套切除术 出血 完整切除
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急性脑梗死患者外周血中性粒细胞/淋巴细胞比值与颈动脉易损斑块的关系 被引量:10
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作者 张娟 张春梅 陈伟男 《中国现代医学杂志》 CAS 北大核心 2021年第2期67-71,共5页
目的探讨急性脑梗死(ACI)外周血中性粒细胞/淋巴细胞比值(NLR)与颈动脉易损斑块的关系。方法选取2016年9月—2018年1月于哈尔滨医科大学附属第一医院卒中病房住院的ACI患者271例。根据颈动脉超声检查分为无斑块组及有斑块组,其中有斑块... 目的探讨急性脑梗死(ACI)外周血中性粒细胞/淋巴细胞比值(NLR)与颈动脉易损斑块的关系。方法选取2016年9月—2018年1月于哈尔滨医科大学附属第一医院卒中病房住院的ACI患者271例。根据颈动脉超声检查分为无斑块组及有斑块组,其中有斑块组分为稳定斑块组及易损斑块组,比较各组一般资料,中性粒细胞计数、淋巴细胞计数、NLR值的差异。结果斑块组吸烟史、NLR、中性粒细胞计数高于无斑块组,淋巴细胞的计数低于无斑块组(P<0.05)。易损斑块组NLR、中性粒细胞计数及低密度脂蛋白高于稳斑块组,而淋巴细胞的计数低于稳定斑块组(P<0.05)。NLR、低密度脂蛋白是颈动脉易损斑块的独立影响因素(P<0.05),NLR值每增加1个单位,斑块为易损斑块的可能性是原来的1.400(95%CI:1.124,1.744)倍,低密度脂蛋白每增加1个单位,斑块为易损斑块的可能性是原来的2.867(95%CI:1.238,6.640)倍。NLR对ACI患者颈动脉易损斑块的ROC曲线下面积为0.65(95%CI:0.567,0.728),最佳截断点为2.79,此时的敏感性为0.69(95%CI:0.593,0.777),特异性为0.59(95%CI:0.465,0.684)。结论NLR增高对于评估ACI患者颈动脉粥样硬化易损斑块具有一定的参考价值。 展开更多
关键词 脑梗死/脑梗塞 急性病 淋巴细胞 核细胞 颈动脉易损斑块/颈动脉
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紫外拉曼光谱研究FAU到CHA和MFI分子筛的转晶过程(英文) 被引量:3
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作者 张娟 褚月英 +4 位作者 刘小龙 徐好 冯兆池 孟祥举 肖丰收 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2019年第12期1854-1859,共6页
分子筛是一类广泛运用于工业催化的多孔无机微晶材料,尽管其制备方式和晶化机理的报道很多,但是大多局限于无机凝胶合成体系.近年来,分子筛间的转晶生长引起了广泛关注,尤其是以高硅铝比的FAU分子筛作为原料进行转晶,因其结构中含有大... 分子筛是一类广泛运用于工业催化的多孔无机微晶材料,尽管其制备方式和晶化机理的报道很多,但是大多局限于无机凝胶合成体系.近年来,分子筛间的转晶生长引起了广泛关注,尤其是以高硅铝比的FAU分子筛作为原料进行转晶,因其结构中含有大量有序连接的双六元环(D6R)单元,前述研究多认为D6R结构在分子筛间的转晶过程中起着重要作用,但是这种作用并未得到详尽描述.一直以来,紫外拉曼光谱都被认为是表征分子筛结构单元的有力手段,它可用以鉴定分子筛骨架或半骨架结构的特征振动.因此,本文运用紫外拉曼光谱技术监测由FAU分子筛转晶成CHA和MFI的晶化过程,并采用DFT计算进行辅助证明,观察了D6R结构的转晶行为.紫外拉曼光谱结果表明,FAU结构中的D6R物种在分子筛间的转晶过程中对目标分子筛的形成起着关键作用.在FAU转晶成CHA的晶化过程中,紫外拉曼光谱表明FAU和CHA上均出现300 cm-1的振动峰,该峰可归属于D6R结构的弯曲振动.在转化过程中,FAU和CHA的结晶度分别呈现出明显的降低和增长的趋势,而D6R振动峰的强度在实验误差允许范围内基本保持不变,表明尽管体系中存在着FAU溶解和CHA生成的动态平衡,但是D6R结构却始终保持相对稳定,这种现象可归因于二者都含有相同的结构单元D6R,这种结构相似性使得D6R物种更易于保持结构完整性从而进行直接转化.然而,在FAU转晶成MFI的晶化过程中,紫外拉曼光谱表明FAU的300 cm-1振动峰的强度随着晶化时间的延长而不断减弱,与此同时,MFI归属于单六元环(S6R)的289 cm^-1振动峰的强度在短时间内迅速增大到最大值,而归属于四元环(4R)和五元环(5R)的433,475和377 cm^-1振动峰的强度均与MFI结晶度的增长呈现相同趋势.这表明转化过程中FAU结构的D6R物种将更倾向于被分解成两个S6R而非三个4R,4R和5R只能在MFI骨架结构形成后被观察到,即发挥作用的基本结构单元是S6R而非5R,分解出来的S6R再用以进一步组装成MFI结构.为进一步验证D6R结构易于分解成S6R,采用DFT计算对从D6R结构分解成两个S6R和三个4R的生成焓进行了比较.结果表明,分解成两个S6R的生成焓(–16.3 kcal/mol)明显低于分解成三个4R的生成焓(–4.6 kcal/mol),说明D6R生成两个S6R的可能性更大,这恰好与紫外拉曼光谱的结果一致.上述研究将有助于更好地理解分子筛间的转晶行为. 展开更多
关键词 分子筛转晶 紫外拉曼光谱 密度泛函理论计算 双六元环 分解和再组装
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克唑替尼治疗晚期或复发性ALK阳性非小细胞肺癌的疗效和安全性 被引量:11
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作者 李晓燕 许华艳 +5 位作者 高芳 康勋 张娟 赵静 林艺 刘晓晴 《中国肺癌杂志》 CAS CSCD 北大核心 2019年第8期488-493,共6页
背景与目的间变性淋巴瘤激酶(anaplastic lymphoma kinase, ALK)基因在晚期非小细胞肺癌(nonsmall cell lung cancer, NSCLC)中的阳性比例约为5%-7%,ALK酪氨酸激酶抑制剂(tyrosine kinase inhibitor, TKI)为ALK阳性NSCLC患者的标准治疗... 背景与目的间变性淋巴瘤激酶(anaplastic lymphoma kinase, ALK)基因在晚期非小细胞肺癌(nonsmall cell lung cancer, NSCLC)中的阳性比例约为5%-7%,ALK酪氨酸激酶抑制剂(tyrosine kinase inhibitor, TKI)为ALK阳性NSCLC患者的标准治疗。本研究拟评价克唑替尼在ALK阳性的晚期或复发性NSCLC患者中的疗效和安全性。方法用三种方法筛选携带ALK基因融合/倒位的晚期或复发NSCLC患者,免疫荧光原位杂交(flourescence in situ hybridization, FISH)显示阳性者给予克唑替尼口服,250 mg,2次/d。评价客观有效率(objective response rate,ORR)、无进展生存期(progression-free survival, PFS)及安全性。结果共筛选226例患者,其中39例出现ALK融合或倒位,37例入组,35例患者可评价客观疗效,ORR为70.3%,疾病控制率(disease control rate, DCR)为94.6%,中位PFS为11.8个月,主要不良反应为转氨酶升高(1级,91.7%)、转氨酶升高(2级,23.4%)、恶心(1级,75.6%)、贫血(1级-2级,62.3%)、视物障碍(1级,21.8%)、体重减轻(1级,31.4%)、肺炎(2级,3.5%)。结论克唑替尼单药可用于治疗ALK融合/倒位的晚期NSCLC患者,有效率高,耐受性较好。 展开更多
关键词 肺肿瘤 EML4-ALK 克唑替尼
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基于过程性质量的幼儿园生活活动评价指标体系的构建 被引量:4
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作者 杨莉君 张娟 郭念舟 《学前教育研究》 CSSCI 北大核心 2022年第1期10-21,共12页
幼儿园生活活动是幼儿在园的重要活动类型,对幼儿的学习与发展具有重要意义。幼儿园生活活动质量是幼儿园保教质量的有机组成部分,有必要基于过程性质量的视角构建幼儿园生活活动评价指标体系。本研究运用问卷调查、德尔菲专家访谈及文... 幼儿园生活活动是幼儿在园的重要活动类型,对幼儿的学习与发展具有重要意义。幼儿园生活活动质量是幼儿园保教质量的有机组成部分,有必要基于过程性质量的视角构建幼儿园生活活动评价指标体系。本研究运用问卷调查、德尔菲专家访谈及文献分析等方法,首先尝试探索幼儿园生活活动评价初始指标,编制出预测问卷,再经项目质量分析、探索性因子分析以及验证性因子分析,形成正式问卷,最后进行信效度检验。研究结果表明,从生活常规与管理、互动与支持、科学照料3个一级指标及其包含的7个二级指标、32个三级指标对幼儿园生活活动质量进行评价是科学合理的。整个评价指标体系体现了过程性、情境性特点和以“预防为主”的指向,可以为改善幼儿园生活活动质量提供有效依据。 展开更多
关键词 过程性质量 生活活动 教育质量
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超级中学并不“超级”——基于厦门大学本科毕业生学习经历的实证调查 被引量:2
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作者 郭建鹏 张娟 +1 位作者 甘雅娟 柯雅清 《教育与经济》 CSSCI 北大核心 2019年第5期62-70,共9页
基于2017年对厦门大学2616名本科毕业生学习经历的调查数据,采用两水平分层线性模型对比分析超级中学与一般中学生源的学生进入大学四年之后在大学课内外学习体验、学习性投入、学习满意度、核心能力和绩点分数上的差异。结果显示,与毕... 基于2017年对厦门大学2616名本科毕业生学习经历的调查数据,采用两水平分层线性模型对比分析超级中学与一般中学生源的学生进入大学四年之后在大学课内外学习体验、学习性投入、学习满意度、核心能力和绩点分数上的差异。结果显示,与毕业于一般中学的学生相比,毕业于超级中学的学生并未表现出明显优势。超级中学在破坏教育公平和教育生态的同时,并未提高办学效率,应对其进行综合治理,以促进基础教育均衡化、多样化发展。 展开更多
关键词 超级中学 大学生学习经历 教育公平 办学效率 基础教育均衡
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高频振荡通气联合肺表面活性物质治疗新生儿呼吸窘迫综合征的研究 被引量:8
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作者 许冬梅 张小华 +2 位作者 张娟 陈艳艳 季卫刚 《中国现代医学杂志》 CAS 北大核心 2022年第5期13-19,共7页
目的探讨高频振荡通气联合肺表面活性物质治疗新生儿呼吸窘迫综合征的疗效,以及对炎症因子、心肌损伤标志物、microRNA-21(miR-21)、呼吸力学指标、肺功能指标的影响。方法选取南通市妇幼保健院2018年1月-2020年12月收治的新生儿呼吸窘... 目的探讨高频振荡通气联合肺表面活性物质治疗新生儿呼吸窘迫综合征的疗效,以及对炎症因子、心肌损伤标志物、microRNA-21(miR-21)、呼吸力学指标、肺功能指标的影响。方法选取南通市妇幼保健院2018年1月-2020年12月收治的新生儿呼吸窘迫综合征患儿150例,按照治疗方法分为对照组与干预组,每组75例。对照组实施常规通气联合肺表面活性物质治疗,干预组实施高频振荡通气联合肺表面活性物质治疗。采用放射免疫测定肿瘤坏死因子-α(TNF-α)、白细胞介素-6(IL-6)、白细胞介素-8(IL-8)水平;采用酶联免疫吸附试验(ELISA)检测肌酸磷酸激酶同工酶(CK-MB)、氨基末端B型脑钠肽前体(NT-proBNP)水平;采用实时荧光定量聚合酶链反应(qRT-PCR)检测miR-21 mRNA相对表达量;检测并比较两组的呼吸力学指标、肺功能指标,比较两组的临床疗效和并发症总发生率。结果干预组治疗后7 d的TNF-α、IL-6、IL-8、CK-MB、NT-proBNP水平、miR-21 mRNA相对表达量、PaCO_(2)低于对照组(P<0.05);干预组PaO_(2)、氧合指数、每千克体重潮气量(TV)、达峰容积比(TPEF/TE)、达峰时间比(VPEF/VE)高于对照组(P<0.05);两组治疗有效率比较,差异无统计学意义(P>0.05);干预组并发症总发生率(5.33%)低于对照组(16.00%)(P<0.05)。结论高频振荡通气联合肺表面活性物质治疗新生儿呼吸窘迫综合征疗效显著,改善患儿呼吸功能和肺功能,减轻炎症反应,保护心肌细胞,减少并发症。 展开更多
关键词 新生儿呼吸窘迫综合征 高频振荡通气 肺表面活性物质 氨基末端B型脑钠肽前体 白细胞介素-6 MICRORNA-21
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中国BRCA1和BRCA2基因胚系突变乳腺癌的临床病理特征比较 被引量:1
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作者 陈蕾燕 孙洁 +5 位作者 万琪婷 胡丽 姚璐 张娟 徐晔 解云涛 《中国肿瘤临床》 CAS CSCD 北大核心 2022年第23期1224-1229,共6页
目的:比较中国人群中BRCA1和BRCA2基因两种突变状态的乳腺癌患者临床病理特征的差异。方法:收集2003年10月至2015年5月北京大学肿瘤医院收治的8627例连续的、未经家族史和年龄选择的原发性乳腺癌患者资料,经过基因测序共有521例患者携带... 目的:比较中国人群中BRCA1和BRCA2基因两种突变状态的乳腺癌患者临床病理特征的差异。方法:收集2003年10月至2015年5月北京大学肿瘤医院收治的8627例连续的、未经家族史和年龄选择的原发性乳腺癌患者资料,经过基因测序共有521例患者携带BRCA1/2基因致病性胚系突变,其中BRCA1突变患者203例,BRCA2突变患者318例。对这些突变患者的临床病理参数进行回顾性分析。结果:乳腺癌患者中BRCA2基因突变频率(3.7%)高于BRCA1(2.4%)。BRCA1突变者乳腺癌发病年龄比BRCA2突变者早(中位发病年龄:43.0岁vs.47.0岁,P<0.01)。BRCA1突变乳腺癌患者组织学分级Ⅲ级比例显著高于BRCA2突变患者(36.2%vs.18.4%,P<0.01),三阴性乳腺癌(ER-/PR-/HER2-)比例也显著高于BRCA2突变者(59.2%vs.15.4%,P<0.01)。BRCA2突变患者的腋窝淋巴结阳性比例高于BRCA1突变患者(41.8%vs.29.6%,P<0.01)。结论:中国BRCA1和BRCA2胚系突变乳腺癌的临床病理特征存在一定差异,提示BRCA1和BRCA2胚系突变对乳腺癌生物学行为的影响可能不同,为BRCA1和BRCA2胚系突变乳腺癌更加精准的临床管理提供依据。 展开更多
关键词 乳腺癌 BRCA1基因 BRCA2基因 临床病理特征
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超广角眼底自发荧光在Stargardt病中的特征和应用价值 被引量:1
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作者 郑志坤 张娟 +1 位作者 黎铧 李娟娟 《国际眼科杂志》 CAS 北大核心 2021年第12期2191-2194,共4页
目的:探讨超广角眼底自发荧光在Stargardt病中的特征和应用价值。方法:回顾分析2016-05/2020-08在云南省第二人民医院眼科门诊经过多种影像检查及基因测序而确诊的Stargardt病患者38例76眼。使用超广角眼底自发荧光成像检查,并对比传统... 目的:探讨超广角眼底自发荧光在Stargardt病中的特征和应用价值。方法:回顾分析2016-05/2020-08在云南省第二人民医院眼科门诊经过多种影像检查及基因测序而确诊的Stargardt病患者38例76眼。使用超广角眼底自发荧光成像检查,并对比传统眼底彩照、眼底55°自发荧光、光相干断层扫描的影像特征,评估超广角眼底自发荧光在Stargardt病中的影像特征及其临床应用优势。结果:超广角眼底自发荧光检查中76眼(100%)均发生了后极部的高自发荧光,而传统55°自发荧光检查仅有42眼(55%)可见明显的后极部高自发荧光。76眼中66眼(87%)可见不同数量的斑点,从后极部向周边视网膜分布,超广角眼底自发荧光较眼底彩照能显示更为清晰和更多数量的视网膜斑点,更为完整地显示斑点的分布数量和面积。76眼(100%)均可见黄斑中心处RPE萎缩所呈现的卵圆形低自发荧光区域,随病变进展,萎缩区扩大、低荧光区域相应扩大,超广角眼底自发荧光能完整显示萎缩范围和面积,但无法从萎缩深度上进行显示。48眼(63%)超广角眼底自发荧光中可见强背景自发荧光从黄斑处向视盘鼻侧和颞下方扩展,在视盘下方形成一明显的近似垂直的分界线。结论:Stargardt病中的自发荧光变化不仅局限于后极,而且可能在周围延伸得更多,超广角眼底自发荧光成像是评估Stargardt病患者的有用工具。 展开更多
关键词 自发荧光 眼底黄色斑点 STARGARDT病 超广角成像
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