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Synthesis and optical properties of highly efficient Na_(3)KMg_(7)(PO_(4))_(6):Eu^(2+)blue phosphor for full-spectrum white-light-emitting diodes:The role of Li_(2)CO_(3)flux

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Journal of Rare Earths 2024年第7期42卷 1217-1223,I0001页

作者： Zihao wang Sisi Liang Chenyang Zhan kunyuan Xu Jie Hu Dejian Chen Liping Song Haomiao Zhu School of Physics and Materials Science Nanchang UniversityNanchang330000China Ganjiang Innovation Academy Chinese Academy of SciencesGanzhou341000China CAS Key Laboratory of Design and Assembly of Functional Nanostructures and Fujian Key Laboratory of NanomaterialsFujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou350002China Xiamen Key Laboratory of Rare Earth Photoelectric Functional Materials Xiamen Research Center of Rare Earth MaterialsHaixi InstituteChinese Academy of SciencesXiamen361021China

Full-spectrum phosphor-converted white-light-emitting diodes(pc-WLED)are emerging as a mainstream technology in semiconductor ***,high-performance blue phosphor which can be excited efficiently by a 400 nm NUV diode chip is still ***,we present a blue-emitting Na_(3)KMg_(7)(PO_(4))6:Eu^(2+)phosphor synthesized by the solid-reaction ***,we find that the using of Li_(2)CO_(3)as flux can significantly improve the crystal quality and thus the emission efficiency of the ***,the excitation peak of the phosphor shifts from 365 to 400 nm,which is pivotal for efficient NUV(400 nm)diode chip *** practical Eu^(2+)concentration is also enhanced by using Li_(2)CO_(3)as flux,and the absorption efficiency is greatly *** phosphor exhibits superior PL thermal stability,namely retains 94%integrated photoluminescence intensity at 150℃of that at 25℃.As a result,the optimized phosphor shows an emission band peaked at 437 nm with a bandwidth of 40 nm and a high external photoluminescence quantum yield of 51.7%.Finally,a pc-WLED was fabricated by using NKMPO:Eu^(2+)blue,Sr_(2)SiO_(4):Eu^(2+)green,CaAlSiN_(3):Eu^(2+)red phosphors,and a 400 nm NUV diode *** shows a high color rendering index of R_(a)=96.4 and a correlated color temperature of 4358 *** results prove that NKMPO:Eu^(2+)is a promising blue phosphor for full-spectrum WLED based on NUV diode chips.

关键词： Eu^(2+) Blue phosphor Na_(3)KMg_(7)(PO_(4))_(6) Full-spectrum white LEDs Rare earths

Berberine enhances the anti-hepatocellular carcinoma effect of NK92-MI cells through inhibiting IFN-gamma-mediated PD-L1 expression

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Liver Research 2022年第3期6卷 167-174页

作者： kunyuan wang Chengxin Gu Ganxiang Yu Jiaen Lin Zhilei wang Qianting Lu Yangzhi Xu Dan Zhao Xiaofeng Jiang Weijian Mai Shiming Liu Hui Yang Department of Gastroenterology The Second Affiliated Hospital of Guangzhou Medical UniversityGuangzhouGuangdongChina Department of Hepatobiliary Surgery The Second Affiliated Hospital of Guangzhou Medical UniversityGuangzhouGuangdongChina Guangzhou Institute of Cardiovascular Disease The Second Affiliated Hospital of Guangzhou Medical UniversityGuangzhouGuangdongChina

Background and aims:Berberine is one of the most promising clinically tested natural alkaloids,and immunotherapy using natural killer(NK)cells is a potentially effective treatment for hepatocellular carcinoma(HCC).This study aims to elucidate the effect of berberine on the anti-HCC effect of NK92-MI *** and methods:Human HCC SMMC-7721 and Hep3B cells were co-incubated with NK92-MI cells,berberine(60 or 80 mmol/L),or their combination for 36 *** evaluate the killing effect of NK92-MI cells on HCC cells,the release of lactate dehydrogenase(LDH)in HCC cells was *** anti-tumor effects of berberine,NK92-MI cells,and their combinations were evaluated by MTS,EdU,Tunel,and Western blot assays.A male BALB/c nude mouse subcutaneous tumor model was used to investigate the anti-HCC effect of berberine and NK92-MI cells in ***:The LDH assay showed that berberine enhanced the cytotoxicity of NK92-MI cells on HCC *** combination of berberine and NK92-MI cells demonstrated more obvious anti-HCC effect than did the berberine or NK92-MI single treatment in inhibiting cell proliferation and inducing apoptosis both in vitro and in ***,the expression of programmed cell death-ligand 1(PD-L1)in HCC cells was upregulated after co-culture with NK-92MI ***-L1 expression was knocked down,thereby inhibiting the proliferation and promoting apoptosis of HCC cells,and inhibited by berberine that blocked the secretion of interferon gamma(IFN-g),thereby enhancing the anti-tumor effect of NK92-MI ***:Current data show that the immunomodulatory role of berberine is to enhance the cytotoxic effect of NK92-MI cells and inhibit tumor immune escape by reducing the expression of *** study provides a rationale for the clinical application of berberine in combination with NK cells for the treatment of HCC.

关键词： Berberine Hepatocellular carcinoma(HCC) NK92-MI cells Interferon gamma(IFN-g) Programmed cell death-ligand 1(PD-L1)

Advancing microarray fabrication:One-pot synthesis and highresolution patterning of UV-crosslinkable perovskite quantum dots

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Nano Research 2024年第9期17卷 8600-8609页

作者： Linfeng Yuan Dejian Chen Kun He Jiamin Xu kunyuan Xu Jie Hu Sisi Liang Haomiao Zhu CAS Key Laboratory of Design and Assembly of Functional Nanostructures and Fujian Key Laboratory of Nanomaterials Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China Fujian Science&Technology Innovation Laboratory for Optoelectronic Information of China Fuzhou 350108China University of Chinese Academy of Sciences Beijing 100049China College of Chemistry and Materials Science Fujian Normal UniversityFuzhou 350007China Xiamen Key Laboratory of Rare Earth Photoelectric Functional Materials Xiamen Research Center of Rare Earth MaterialsHaixi InstituteChinese Academy of SciencesXiamen 361021China

The development of highly efficient,solution-processable,and environmentally stable perovskite quantum dots(PQDs)is crucial for their accurate high-resolution patterning and subsequently enabling the practical deployment of PQD based emissive display *** study presents an innovative strategy for integrating all-inorganic PQDs and ultraviolet(UV)crosslinkable acrylate polymer at a structural and functional *** achievement is accomplished by meticulous design and one-pot synthesis of UV-crosslinkable CsPbX_(3)(X=Cl,Br,I)PQDs solution,which exhibit outstanding environmental *** the solution-processable characteristics of the resulting UV-crosslinkable PQDs,precise patterning of high-resolution(2μm,7608 pixels·in.^(-1))and colorful PQDs microarrays can be readily achieved through inkjet printing and high-throughput photolithography(~2μm in pitch line/space patterning).The UV cross-linked process guarantees a homogeneous distribution of PQDs,effectively mitigating coffee ring effect and improving the overall quality of stereoscopic *** photo-cured PQDs film,which undergoes free radical photopolymerization,displays an impressive photoluminescence quantum yield(PL QY)of up to 89.2%,reaching 98%of the value observed in the solution *** approach outlined in this research is both cost-effective and pragmatic,exhibiting tremendous promise for diverse system-level integrated optoelectronic devices,such as ultra-high-resolution micro-light-emitting device(micro-LED)displays.

关键词： perovskite quantum dots microarrays cross-linking strategy Inkjet printing photolithography

Peng-Robinson状态方程计算合氢系统汽液平衡——超临界气体的参数处理

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化工学报 1989年第1期40卷 73-81页

作者：刘昆元汪文川北京化工学院

本文修正了Peng-Robinson 状态方程,使之适用于氢烃二元系统的汽-液平衡计算.对超临界气体氢引入了新的、随温度而变的a表达式和协体积项b的二元交互作用参数.计算了19个二元系统,结果表明本研究较前人为优.尤其是对氢-重烃(C_6-C_(16))... 详细信息

本文修正了Peng-Robinson 状态方程,使之适用于氢烃二元系统的汽-液平衡计算.对超临界气体氢引入了新的、随温度而变的a表达式和协体积项b的二元交互作用参数.计算了19个二元系统,结果表明本研究较前人为优.尤其是对氢-重烃(C_6-C_(16)),亦优于Mathias修正的Redlich-Kwong-Soave状态方程和Chao等人最近提出的立方型转子链状态方程(CCOR状态方程).修正后的a表达式除改进了汽液平衡结果,还可准确地推算氢气的P-V-T关系和第二维里系数.本研究推荐的方法可用于实际工程计算.

关键词：状态方程含氢系统汽液平衡

硅烷化处理的纳米ZSM-5的结构表征及催化性能

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催化学报 2007年第7期28卷 617-621页

作者：王坤院王祥生李钢龙化云大连理工大学催化化学与工程系精细化工国家重点实验室辽宁大连116012

采用多次浸渍法和化学反应沉积法对纳米HZSM-5分子筛外表面进行了硅烷化处理,考察了改性后纳米ZSM-5对甲苯歧化的催化活性.采用改进的Hammett指示剂法和吡啶吸附红外光谱研究了催化剂的酸性位,采用X射线衍射和29Si MASNMR对催化剂的结... 详细信息

采用多次浸渍法和化学反应沉积法对纳米HZSM-5分子筛外表面进行了硅烷化处理,考察了改性后纳米ZSM-5对甲苯歧化的催化活性.采用改进的Hammett指示剂法和吡啶吸附红外光谱研究了催化剂的酸性位,采用X射线衍射和29Si MASNMR对催化剂的结构进行了表征.研究结果表明,硅烷化处理降低了纳米ZSM-5酸性位的浓度,从而降低了纳米ZSM-5的催化活性.硅烷化处理还减少了纳米ZSM-5中Si的Q4物种,降低了纳米ZSM-5的相对结晶度,同时硅烷化处理产生了脱铝作用.骨架铝含量的减少导致催化剂的酸性位减少,催化活性降低.

关键词：纳米ZSM-5沸石硅烷化甲苯歧化

铈离子与乙酰苯胺及其衍生物引发丙烯酰胺聚合动力学的研究

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高分子学报 1989年第3期 355-362页

作者：丘坤元王伟北京大学化学系

以铈离子和酰苯胺引发体系进行丙烯酰胺的聚合,研究了不同结构酰苯胺对聚合的影响。在H_2O-CH_3CN(3∶1)介质中聚合时,乙酰对甲苯胺对聚合的促进作用最为明显,聚合速度可提高一个数量级。测定了聚合反应的表观活化能和聚合动力学方程、... 详细信息

以铈离子和酰苯胺引发体系进行丙烯酰胺的聚合,研究了不同结构酰苯胺对聚合的影响。在H_2O-CH_3CN(3∶1)介质中聚合时,乙酰对甲苯胺对聚合的促进作用最为明显,聚合速度可提高一个数量级。测定了聚合反应的表观活化能和聚合动力学方程、由聚合物的原子发射光谱,UV光谱和端基测定,提出了聚合反应机理。

关键词：引发剂铈/乙酰苯胺丙烯酰胺

番茄综合营养品质指标构建及其对水肥供应的响应

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农业工程学报 2014年第7期30卷 119-127页

作者：吴雪王坤元牛晓丽胡田田西北农林科技大学水利与建筑工程学院杨凌712100 西北农林科技大学食品科学与工程学院杨凌712100

为构建番茄综合营养品质指标,分析其对水肥供应的响应,该文以灌水量和氮、磷、钾肥用量为试验因素,按照四元二次正交旋转组合设计,进行番茄盆栽试验,监测番茄可溶性固形物、可溶性糖、可滴定酸、糖酸比、番茄红素和维生素C 6项单一品质... 详细信息

为构建番茄综合营养品质指标,分析其对水肥供应的响应,该文以灌水量和氮、磷、钾肥用量为试验因素,按照四元二次正交旋转组合设计,进行番茄盆栽试验,监测番茄可溶性固形物、可溶性糖、可滴定酸、糖酸比、番茄红素和维生素C 6项单一品质指标,根据主观层次分析法与客观熵权法和基于博弈论的组合赋权法,确定番茄单一营养品质评价指标权重,次序为:番茄红素>糖酸比>维生素C>可溶性糖>可溶性固形物>可滴定酸;通过近似理想解法,构建番茄果实综合营养品质评价指标。在此基础上,通过回归分析建立番茄综合营养品质与水肥因子的数学模型,分析其对水肥因子的响应关系。结果表明,各水肥因子对番茄综合营养品质的主效应表现为:施磷量>施氮量>灌水量>施钾量。当其他因素为中间水平时,番茄营养品质随灌水量或施氮量的增加呈开口向下的抛物线型变化,随磷肥用量的增加线性增加,随施钾量的增加呈开口向上的抛物线型变化。交互作用表现为,灌水量与施氮量、磷与钾肥用量之间存在显著交互作用。表明灌水量、氮肥用量过高不利于番茄综合营养品质的提高,合理增施磷肥和钾肥可有效提高番茄营养品质。

关键词：肥料灌溉层次分析法番茄综合营养品质评价灌水量四元二次正交旋转组合设计

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煤矿长壁开采过程中埋地管道的变形破坏分析

油气储运 2016年第4期35卷 439-443页

作者：王坤园程国明陈剑中国地质大学(北京) 中国地质环境监测院

近年来煤矿开采引起的地面塌陷已影响了油气管道的安全运营,我国煤矿采空区上方埋地管道的安全性评判标准及稳定性量化标准尚不成熟,对长壁开采过程中不同开采阶段引起的管道变形破坏特征尚未研究。利用安全系数的概念反映管道不同部位... 详细信息

近年来煤矿开采引起的地面塌陷已影响了油气管道的安全运营,我国煤矿采空区上方埋地管道的安全性评判标准及稳定性量化标准尚不成熟,对长壁开采过程中不同开采阶段引起的管道变形破坏特征尚未研究。利用安全系数的概念反映管道不同部位的应力情况,基于第四强度理论,应用有限差分软件FLAC3D中的FISH语言输出管道的安全系数,判断管道的稳定性,进而分析了长壁开采过程中不同开采阶段管道的下沉和安全系数的变化规律。研究结果为沉陷区埋地管道的监测和防护提供了理论依据。

关键词：埋地管道长壁开采变形破坏 FLAC^3D

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十年磨一剑:肝细胞癌诊疗新进展

中华肝脏病杂志 2021年第2期29卷 111-115页

作者：刘红艳王坤远樊蓉侯金林南方医科大学南方医院感染内科肝病中心广州510515 南方医科大学深圳医院肝病中心深圳518133

肝细胞癌(HCC)是全世界范围内发病率和死亡率极高的恶性肿瘤之一,肿瘤晚期预后欠佳。近十年来,HCC治疗领域出现的新进展涵盖了外科手术、消融、经血管介入、外放射治疗、系统治疗等方面,其中尤以靶向和免疫检查点药物等系统治疗方面的... 详细信息

肝细胞癌(HCC)是全世界范围内发病率和死亡率极高的恶性肿瘤之一,肿瘤晚期预后欠佳。近十年来,HCC治疗领域出现的新进展涵盖了外科手术、消融、经血管介入、外放射治疗、系统治疗等方面,其中尤以靶向和免疫检查点药物等系统治疗方面的进展尤为突出,显著提高了肝癌患者的五年生存率。此外,针对肝癌患者的管理,尤其是高风险人群的筛查和多学科协作诊疗,提升了肝癌的早诊率和改善了总体治疗效果。考虑到我国国情和现有治疗手段的发展情况,在未来,精准识别高危HCC人群,提高HCC早诊率,制定个性化的HCC治疗策略,将是降低HCC死亡率的最有效手段。

关键词：肝细胞癌筛查早期诊断多学科协作诊疗系统治疗