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Left-Invariant Minimal Unit Vector Fields on the Solvable Lie Group

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Chinese Annals of Mathematics,Series B 2023年第1期44卷 67-80页

作者： Shaoxiang ZHANG ju tan College of Mathematics and Systems Science Shandong University of Science and TechnologyQingdao 266590ShandongChina School of Microelectronics and Data Science Anhui University of TechnologyMaanshan 243032AnhuiChina

Bozek(1980)has introduced a class of solvable Lie groups Gn with arbitrary odd dimension to construct irreducible generalized symmetric Riemannian space such that the identity component of its full isometry group is *** this article,the authors provide the set of all left-invariant minimal unit vector fields on the solvable Lie group Gn,and give the relationships between the minimal unit vector fields and the geodesic vector fields,the strongly normal unit vectors respectively.

关键词： Solvable Lie groups Lagrangian multiplier method Minimal unit vector fields Geodesic vector fields Strongly normal unit vectors

Isoparametric Hypersurfaces Induced by Navigation in Lorentz Finsler Geometry

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Acta Mathematica Sinica,English Series 2023年第8期39卷 1547-1564页

作者： Ming XU ju tan Na XU School of Mathematical Sciences Capital Normal UniversityBeijing 100048P.R.China School of Microelectronics and Data Science Anhui University of TechnologyMaanshan 243032P.R.China

Using a navigation process with the datum(F,V),in which F is a Finsler metric and the smooth tangent vector field V satisfies F(−V(x))>1 everywhere,a Lorentz Finsler metric F˜can be *** functions and isoparametric hypersurfaces with or without involving a smooth measure can be defined for F˜.When the vector field V in the navigation datum is homothetic,we prove the local correspondences between isoparametric functions and isoparametric hypersurfaces before and after this navigation *** these correspondences,we provide some examples of isoparametric functions and isoparametric hypersurfaces on a Funk space of Lorentz Randers type.

关键词： Finsler metric homothetic vector field isoparametric function isoparametric hypersurface Lorentz Finsler metric Zermelo navigation

非甲烷总烃分析仪专用Co_(3)O_(4)/Al_(2)O_(3)催化剂的制备及性能研究

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湖北大学学报（自然科学版） 2024年第3期46卷 347-355页

作者：谭聚杨琴琴何瑜湖北大学化学化工学院湖北武汉430062

挥发性有机化合物(volatile organic compounds,VOCs)是引发霾和光化学烟雾等环境问题的重要原因,达到一定浓度会对人类健康造成威胁。非甲烷总烃(non-methane hydrocarbon,NMHC)作为VOCs总量统计的重要指标,在一定程度上可以简单、直... 详细信息

挥发性有机化合物(volatile organic compounds,VOCs)是引发霾和光化学烟雾等环境问题的重要原因,达到一定浓度会对人类健康造成威胁。非甲烷总烃(non-methane hydrocarbon,NMHC)作为VOCs总量统计的重要指标,在一定程度上可以简单、直观地反映VOCs污染状况,因此,监控NMHC对保护环境与人类健康具有重要意义。本文中制备了层状结构、球形结构和立方体结构3种不同形貌的Co_(3)O_(4)纳米材料,将纳米材料均匀负载于活性Al_(2)O_(3)颗粒表面作为NMHC分析专用催化剂。通过XRD、FESEM、BET和XPS技术对制备的Co_(3)O_(4)催化剂进行表征;并将催化剂用于NMHC的检测,对不同形貌催化剂的催化性能进行评价。结果表明,当煅烧温度为400℃、煅烧时间为3 h,催化剂具有较高的催化活性,其中立方体结构催化剂具有最高的催化活性,能在236℃将NMHC完全降解,层状结构与球形结构催化剂分别在261℃与257℃将NMHC完全降解。升高煅烧温度有助于催化活性的提高,因为煅烧温度的升高增大了催化剂中Co_(3)O_(4)的相对结晶度与O_(ads)/O_(latt)摩尔比,使得气体转移速度加快,因而使催化剂具有更高的催化活性。催化剂经过耐水性、热失重测试与催化循环测试后仍能保持较高的催化活性。

关键词： Co_(3)O_(4)/Al_(2)O_(3)催化剂非甲烷总烃色谱-催化氧化法形貌

不同方法测定口服五维赖氨酸葡萄糖中盐酸赖氨酸含量的研究

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化学工程师 2024年第5期38卷 20-25页

作者：何虹刘庄蔚蒋洁谭菊英广西壮族自治区药品检验研究院广西南宁530021

目的分别建立氨基酸分析仪测定法、高效液相色谱测定法测定口服五维赖氨酸葡萄糖中盐酸赖氨酸的含量,比较两种分析方法的适用性。方法氨基酸分析仪法:钠系统,程序洗脱,LCAK06/Na色谱柱分离,茚三酮溶液衍生显色,测定波长570nm;高效液相... 详细信息

目的分别建立氨基酸分析仪测定法、高效液相色谱测定法测定口服五维赖氨酸葡萄糖中盐酸赖氨酸的含量,比较两种分析方法的适用性。方法氨基酸分析仪法:钠系统,程序洗脱,LCAK06/Na色谱柱分离,茚三酮溶液衍生显色,测定波长570nm;高效液相色谱法:以Alltima-C_(18)(250mm×4.6mm,5μm)为色谱柱,以5mmol·L^(-1)庚烷磺酸钠溶液(用20%H_(3)PO_(4)溶液调节pH值为2.5)为流动相A,乙腈为流动相B,梯度洗脱,流速为1mL·min^(-1),柱温为40℃,检测波长200nm,进样量为20μL。结果两种方法测定96批口服五维赖氨酸葡萄糖中盐酸赖氨酸的含量,结果经T检验统计分析存在显著性差异(t=4.413,P<0.001)。结论氨基酸分析仪法与高效液相色谱法比较,更适用于口服五维葡萄糖赖氨酸颗粒中盐酸赖氨酸含量的测定,且所建立的方法简单、快捷、专属性好,可以用于本品的质量控制。

关键词：氨基酸分析仪口服五维赖氨酸葡萄糖盐酸赖氨酸高效液相色谱法

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地肤对土壤镉胁迫的生理生化响应

湖南农业科学 2024年第5期 43-50页

作者：黎标郭佳源谭璐王凡杨海君谭菊湖南中拓环境工程有限公司湖南长沙410000 湖南农业大学环境与生态学院湖南长沙410128 长沙环境保护职业技术学院湖南长沙410004 湖南省长沙生态环境监测中心湖南长沙410001

为探究地肤对酸性土壤中重金属镉(Cd)污染的抗性和敏感性,分别在初始土壤pH值6.1(T处理组)、pH值5.0(TS处理组)条件下,设置不同浓度Cd(1.253、1.553、2.153、2.753、4.253和10.253 mg/kg)胁迫盆栽控制试验,研究了2种pH值和不同Cd浓度处... 详细信息

为探究地肤对酸性土壤中重金属镉(Cd)污染的抗性和敏感性,分别在初始土壤pH值6.1(T处理组)、pH值5.0(TS处理组)条件下,设置不同浓度Cd(1.253、1.553、2.153、2.753、4.253和10.253 mg/kg)胁迫盆栽控制试验,研究了2种pH值和不同Cd浓度处理对地肤生理生化指标的影响。结果表明:(1)Cd胁迫对地肤根总长度、总表面积、总体积、平均直径及根尖数影响均不明显,其中1.253~2.753 mg/kg Cd胁迫下的地肤根、茎及全株生物量变化较小,对土壤镉的耐受性较强,且能较好地适应偏酸性土壤环境;T处理组地肤根系生长发育整体上优于TS处理组。(2)土壤镉含量对地肤光合作用的抑制性不明显,但土壤pH值降低会提高地肤叶片光合色素含量。(3)地肤根部SOD、POD活性、MDA含量整体上高于茎部,相同Cd浓度处理下,土壤pH值升高会提高地肤根茎SOD活性,降低MDA含量。地肤的抗氧化酶系统在防御土壤镉污染胁迫方面起到显著保护作用。

关键词： Cd胁迫地肤生理响应抗氧化系统积累分布

NATURALLY REDUCTIVE(α_(1),α_(2))METRICS

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Acta Mathematica Scientia 2023年第4期43卷 1547-1560页

作者：谭举许明 School of Microelectronics and Data Science Anhui University of TechnologyMaanshan 243032China School of Mathematical Sciences Capital Normal UniversityBeijing 100048China

Letting F be a homogeneous(α_(1),α_(2))metric on the reductive homogeneous manifold G/H,we first characterize the natural reductiveness of F as a local f-product between naturally reductive Riemannian ***,we prove the equivalence among several properties of F for its mean Berwald curvature and ***,we find an explicit flag curvature formula for G/H when F is naturally reductive.

关键词： (α_1,α_2)metric homogeneous Finsler space naturally reductive S-curvature

超高效液相色谱-串联质谱检测蔗糖中47种农药残留量的方法

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药物分析杂志 2024年第6期44卷 979-989页

作者：谭菊英蒋洁刘庄蔚何虹杨欣智朱健萍邓鸣徐光辉王健赵庄卢日刚广西壮族自治区药品检验研究院南宁530021 中粮崇左糖业有限公司/广西壮族自治区甘蔗产业链延伸工程研究中心崇左532200 中粮营养健康研究院有限公司/营养健康与食品安全北京市重点实验室北京102209

目的:建立超高效液相色谱-串联质谱(UPLC-MS/MS)同时测定蔗糖中47种农药残留量的方法。方法:蔗糖样品经酸性乙腈提取,氮气吹干浓缩,采用LC-MS/MS进行分析检测,在多反应检测模式(MRM)下,用空白基质标准曲线-内标法进行定量。结果:各待测... 详细信息

目的:建立超高效液相色谱-串联质谱(UPLC-MS/MS)同时测定蔗糖中47种农药残留量的方法。方法:蔗糖样品经酸性乙腈提取,氮气吹干浓缩,采用LC-MS/MS进行分析检测,在多反应检测模式(MRM)下,用空白基质标准曲线-内标法进行定量。结果:各待测物质在一定浓度范围内线性良好(r>0.995),检测限为0.01~2.00μg·kg^(-1)。分别在蔗糖样品中添加47种农药标准溶液10、25、50μg·kg^(-1),进行标准添加回收试验,方法回收率为71.0%~106.0%,重复性RSD为0.90%~8.5%。15批蔗糖样品中2批检出噻虫嗪、噻虫胺,其余均未检出。结论:该方法具有前处理简单快捷、灵敏、准确等优点,符合农药残留检测要求,满足蔗糖中农药残留检测需要,可用于蔗糖的质量控制。

关键词：蔗糖农药残留液相色谱-质谱多反应监测模式基质效应内标法

Preclinical evaluation of the safety and effectiveness of a new bioartificial cornea

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Bioactive Materials 2023年第11期29卷 265-278页

作者： Yansha Hao Jingting Zhou ju tan Feng Xiang Zhongliang Qin jun Yao Gang Li Mingcan Yang Lingqin Zeng Wen Zeng Chuhong Zhu Department of Anatomy Engineering Research Center for Organ Intelligent Biological Manufacturing of Chongqingkey Lab for Biomechanics and Tissue Engineering of ChongqingThird Military Medical UniversityChongqing400038China Engineering Research Center of Tissue and Organ Regeneration and Manufacturing Ministry of EducationChongqing400038China State Key Laboratory of Traum1 Burnand Combined InjuryChongqingChina Department of Cell Biology Third Military Army Medical UniversityChongqing400038China Hong Chang Biotechnology Co. LtdGuangzhou510700China Zhong Zhi Yi Gu Research Institute Chongqing Jiukang Medical Research Institute Co.Ltd..China

Cross-linking agents are frequently used to restore corneal properties after decellularization,and it is especially important to select an appropriate method to avoid excessive *** addition,how to promote wound healing and how to improve scar formation require further *** ensure the safety and efficacy of animal-derived products,we designed bioartificial corneas(BACs)according to the criteria for Class III medical *** BACs do not require cross-linking agents and increase mechanical strength via self-cross-linking of aldehyde-modified hyaluronic acid(AHA)and carboxymethyl chitosan(CMC)on the surface of decellularized porcine corneas(DPCs).The results showed that the BACs had good biocompatibility and transparency,and the modification enhanced their antibacterial and anti-inflammatory properties in *** animal studies showed that the BACs can rapidly regenerate the epithelium and restore vision within a *** 3 months,the BACs were gradually filled with epithelial,stromal,and neuronal cells,and after 6 months,their transparency and histology were almost *** addition,side effects such as corneal neovascularization,conjunctival hyperemia,and ciliary body hyperemia rarely occur in ***,these BACs show promise for clinical application for the treatment of infectious corneal ulcers and as a temporary covering for corneal perforations to achieve the more time.

关键词： Decellularization Bioartificial cornea Cross-linking Biocompatibility Transparency

Programming of Regulatory T Cells In Situ for Nerve Regeneration and Long-Term Patency of Vascular Grafts

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Research 2022年第4期2022卷 571-587页

作者： Yanhong Wang Fangchao Xue Yanzhao Li Lin Lin Yeqin Wang Shanlan Zhao Xingli Zhao Yong Liu ju tan Gang Li Haoran Xiao juan Yan Hao Tian Min Liu Qiao Zhang Zhaojing Ba Lang He Wenyan Zhao Chuhong Zhu Wen Zeng Department of Cll Biology Third Military Army Medical UniversityChongqing 400038China Department of Anatomy National and Regional Engineering Laboratory of Tssue EngineeringState and Local Joint Engineering Laboratory for Vascular ImplantsKey Lab for Biomechanics and Tissue Engineering of ChongqingThird Military Medical UniversityChongqing 400038China State Key Laboratory of Trauma Burn and Combined InjuryChongqingChina Departments of Neurology Southwest HospitalThird Military Medical UniversityChongqingChina

Rapid integration into the host tissue is critical for long-term patency after small diameter tissue engineering vascular grafts(sdTEVGs)*** recognition may be required for host integration and functionalization of the ***,immune rejection and inflammation hinder nerve regeneration of ***,a CRISPR/dCas9-nanocarrier was used for targeted programming of regulatory T cells(Treg cells)in situ to promote nerve regeneration of sdTEVGs by preventing excessive *** cells and(C-C chemokine receptor)CCR2+macrophage recruitment occurred after *** nanodelivery system upregulated ten eleven translocation(TET2)in Treg cells in *** Treg cells upregulated anti-inflammatory cytokines and decreased the proportion of CCR2+***-6 concentrations decreased to the levels required for nerve *** of CRISPR/dCas9 nanodelivery system-modified sdTEVGs in rats resulted in Treg cell editing,control of excessive inflammation,and promoted nerve *** 3 months,nerve regeneration was similar to that observed in normal blood vessels;good immune homeostasis,consistency of hemodynamics,and matrix regeneration were *** recognition promotes further integration of the graft into the host,with unobstructed blood vessels without intimal *** findings provide new insights into vascular implant functionalization by the host.

关键词： inflammation homeostasis graft