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基于加权Ripley's K-function的多尺度景观格局分析——以江苏盐城滨海湿地为例 被引量:13
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作者 张东菊 左平 邹欣庆 《生态学报》 CAS CSCD 北大核心 2015年第8期2703-2711,共9页
以1987,1992,1997,2002,2007年的遥感影像为例,首次尝试使用加权Ripley's K-function的多尺度格局分析方法,计算了20年来景观异质性在江苏盐城滨海湿地的时间变化和空间分布趋势。通过对研究区的样带划分以及景观类型的点状化处理,... 以1987,1992,1997,2002,2007年的遥感影像为例,首次尝试使用加权Ripley's K-function的多尺度格局分析方法,计算了20年来景观异质性在江苏盐城滨海湿地的时间变化和空间分布趋势。通过对研究区的样带划分以及景观类型的点状化处理,建立滨海湿地样带图层和1987—2007年间各类型景观的点格局数据库,从而分析滨海湿地不同类型景观的空间聚集特征变化。基于加权Ripley's K-function的计算表明,在各级空间尺度和时间变化上,各类型湿地的斑块都呈现出空间聚集分布状态,且1987年以来,不同湿地类型的聚集空间特征尺度和空间分布强度均出现了大幅的增减变化,除互花米草滩之外的自然湿地的聚集空间特征尺度和强度都有明显下降甚至少到无法被检测到,而人工湿地却呈现聚集特征尺度和强度的双增长,且该聚集程度有逐渐增强的趋势。分析表明,既考虑样点的空间位置信息又考虑样点分布范围的加权Ripley's K-function方法能很好地表征湿地景观在多尺度上的变异,且与传统空间景观指数等分析方法的结论在一定程度上保持一致。 展开更多
关键词 盐城滨海湿地 景观空间格局 多尺度空间聚集分析 加权Ripley’s k-function 空间特征尺度 空间分布强度
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泛Clifford分析中的k-向量正则函数与相关算子的性质
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作者 许娜 杨贺菊 李万营 《高校应用数学学报(A辑)》 北大核心 2025年第4期487-500,共14页
该文首先定义了泛Clifford分析的T_(i)算子并研究了T_(i)算子与Dirac算子的交换性质,其次利用Dirac算子和T_(i)算子构造L算子和R算子,定义了取值在泛Clifford代数上的k-向量正则函数,并且研究了k-向量正则函数与其他正则函数类和广义调... 该文首先定义了泛Clifford分析的T_(i)算子并研究了T_(i)算子与Dirac算子的交换性质,其次利用Dirac算子和T_(i)算子构造L算子和R算子,定义了取值在泛Clifford代数上的k-向量正则函数,并且研究了k-向量正则函数与其他正则函数类和广义调和函数的关系.最后给出了泛Clifford代数空间中与R算子和L算子相关的广义的Stokes公式,它是后续找出k-向量正则函数积分表示的重要基础. 展开更多
关键词 泛Clifford代数 L算子 R算子 k-向量正则函数 STOkES公式
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K-凸复合函数的性质
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作者 万莉娟 崔继贤 李晓丹 《高师理科学刊》 2025年第7期8-11,共4页
借助K-凸函数的K-回收映射和K-雅可比映射得到了K-凸复合函数的几个性质。
关键词 k-凸函数 k-回收映射 k-雅可比映射 k-凸复合函数
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一类C-K型方程组Cauchy问题的可解性
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作者 金启胜 《安阳师范学院学报》 2025年第5期6-9,共4页
为了研究一类C-K型方程组Cauchy问题的解析解,首先把高阶非线性C-K型方程组的Cauchy问题简化成一个与它等价的一阶拟线性C-K型方程组的Cauchy问题,然后利用归纳法和强函数方法证明了该Cauchy问题在某个邻域内存在唯一的解析解。
关键词 C-k型方程组 CAUCHY问题 强函数 解析解
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The Non-standard Characteristics of Functional SpacesK(X) and C_0(X) 被引量:1
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作者 陈东立 《Chinese Quarterly Journal of Mathematics》 CSCD 1998年第4期7-9, ,共3页
In this paper,the non standard characteristics of functional spaces K(X) and C 0(X) are presented and proved.
关键词 functional space k(X) functional space C 0(X) near standard points remote points
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Application of DDG-3300K Liver Reserve Function Analyzer and Relevant Nursing Procedures at the Department of Infectious Diseases 被引量:1
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作者 Lihua Zheng Cheng Hu +6 位作者 Yubao Zheng Qiong Shu Xiang Yin Hongmei Pan Haotong Xu Beiqian Wu Ying Liu 《Open Journal of Nursing》 2019年第2期120-124,共5页
Objective: To discuss some key points about nursing in the use of DDG-3300K liver reserve function analyzer in patients at the department of infectious diseases. Method: DDG-3300K liver reserve function analyzer was a... Objective: To discuss some key points about nursing in the use of DDG-3300K liver reserve function analyzer in patients at the department of infectious diseases. Method: DDG-3300K liver reserve function analyzer was applied to 5464 patients at the department of infectious diseases. The reasons for failed detection and complications related to the detection were analyzed, and the measures for improving the nursing procedures were proposed. Result: Among the 5464 patients, the detections were successful at the first attempt in 5458 patients;2 patients had leakage of liquid;2 patients were poorly prepared, and 1 case failed because of mistaken selection of CO mode, which led to adverse drug reactions;1 case did not finish the detection due to anaphylactic shock;8 patients had nausea and 6 patients had skin rash on the four limbs and torso during the detection. Conclusion: It is necessary to formulate the nursing procedures for the use of DDG-3300K liver reserve function analyzer. Moreover, preparatory work, health education, refined nursing procedures and skillful operations are closely related to the success rate and accuracy of the detection. 展开更多
关键词 DDG-3300k LIVER RESERVE function ANALYZER LIVER function RESERVE Indocyanine Green (ICG) Nursing
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A Laurent Expansion and Residue Theorems of k-Regular Functions in Clifford Analysis 被引量:2
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作者 KU Min DU Jinyuan 《Wuhan University Journal of Natural Sciences》 CAS 2009年第2期97-102,共6页
In this context, we mainly study the behavior in the neighborhood of finite singular points for k-regular functions in R1^n with values in R0、n. We get a Laurent expansion of them in an open set, prove its uniqueness... In this context, we mainly study the behavior in the neighborhood of finite singular points for k-regular functions in R1^n with values in R0、n. We get a Laurent expansion of them in an open set, prove its uniqueness, give the definitions of k-poles, isolated and essential singular points and removable singularity, discuss some properties, and further obtain the residue theorems. 展开更多
关键词 Clifford algebra k-regular functions Laurent expansion residue theorems SINGULARITY
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Convexity for New Integral Operator on k-uniformly p-valent a-convex Functions of Complex Order 被引量:1
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作者 LI Shu-hai MA Li-na A O-en 《Chinese Quarterly Journal of Mathematics》 CSCD 2014年第1期88-96,共9页
In this paper, we obtain the convexity of new general integral operator on some classes of k-uniformly p-valent a-convex functions of complex order. These results extend some known theorems.
关键词 analytic functions p-valently k-uniformly STARLIkE CONVEX integral operator
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Developing selective PI3K degraders to modulate both kinase and non-kinase functions
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作者 Zimo Yang Yan Tong +4 位作者 Yongbo Liu Qianlong Liu Zhihao Ni Yuna He Yu Rao 《Chinese Chemical Letters》 SCIE CAS CSCD 2024年第11期384-388,共5页
For the first time,proteolysis-targeting chimeras(PROTAC)technology was utilized to achieve the isoform-selective degradation of class I phosphoinositide 3-kinases(PI3Ks)in this study.Through screening and optimizatio... For the first time,proteolysis-targeting chimeras(PROTAC)technology was utilized to achieve the isoform-selective degradation of class I phosphoinositide 3-kinases(PI3Ks)in this study.Through screening and optimization,the PROTAC molecule ZM-PI05 was identified as a selective degrader of p110αin multiple breast cancer cells.More importantly,the degrader can down-regulate p85 regulatory subunit simultaneously,thereby inhibiting the non-enzymatic functions of PI3K that are independent on p110catalytic subunits.Therefore,compared with PI3K inhibitor copanlisib,ZM-PI05 displayed the stronger anti-proliferative activity on breast cancer cells.In brief,a selective and efficient PROTAC molecule was developed to induce the degradation of p110αand concurrent reduction of p85 proteins,providing a tool compound for the biological study of PI3K-αby blocking its enzymatic and non-enzymatic functions. 展开更多
关键词 PI3k PROTAC p110 P85 SELECTIVITY Degradation Non-kinase functions
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Construction of <i>k</i>-Variate Survival Functions with Emphasis on the Case <i>k</i>= 3
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作者 Jerzy K. Filus Lidia Z. Filus 《Applied Mathematics》 2020年第7期678-697,共20页
The purpose of this paper is to present a general universal formula for <span style="font-family:Verdana;"><span style="font-family:Verdana;">k<span style="font-family:Verdana;&... The purpose of this paper is to present a general universal formula for <span style="font-family:Verdana;"><span style="font-family:Verdana;">k<span style="font-family:Verdana;"><span style="font-family:Verdana;">-variate survival functions for arbitrary <span style="font-family:Verdana;"><span style="font-family:Verdana;">k<span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;"> = 2, 3, <span style="font-family:;" "=""><span style="font-family:Verdana;">...<span style="font-family:Verdana;">, given all the univariate marginal survival functions. This universal form of <span style="font-family:Verdana;"><span style="font-family:Verdana;">k<span style="font-family:Verdana;"><span style="font-family:Verdana;">-variate probability distributions was obtained by means of “dependence functions” named “joiners” in the text. These joiners determine all the involved stochastic dependencies between the underlying random variables. However, in order that the presented formula (the form) represents a legitimate survival function, some necessary and sufficient conditions for the joiners had to be found. Basically, finding those conditions is the main task of this paper. This task was successfully performed for the case <span style="font-family:Verdana;"><span style="font-family:Verdana;">k<span style="font-family:Verdana;"><span style="font-family:Verdana;"> = 2 and the main results for the case <span style="font-family:Verdana;"><span style="font-family:Verdana;">k<span style="font-family:Verdana;"><span style="font-family:Verdana;"> = 3 were formulated as Theorem 1 and Theorem 2 in Section 4. Nevertheless, the hypothetical conditions valid for the general <span style="font-family:Verdana;"><span style="font-family:Verdana;">k<span style="font-family:Verdana;"><span style="font-family:Verdana;"> ≥ 4 case were also formulated in Section 3 as the (very convincing) Hypothesis. As for the sufficient conditions for both the <span style="font-family:Verdana;"><span style="font-family:Verdana;">k<span style="font-family:Verdana;"><span style="font-family:;" "=""><span style="font-family:Verdana;"> = 3 and <span style="font-family:Verdana;"><span style="font-family:Verdana;">k<span style="font-family:Verdana;"><span style="font-family:Verdana;"> ≥ 4 cases, the full generality was not achieved since two restrictions were imposed. Firstly, we limited ourselves to the, defined in the text, “continuous cases” (when the corresponding joint density exists and is continuous), and secondly we consider positive stochastic dependencies only. Nevertheless, the class of the <span style="font-family:Verdana;"><span style="font-family:Verdana;">k<span style="font-family:Verdana;"><span style="font-family:Verdana;">-variate distributions which can be constructed is very wide. The presented method of construction by means of joiners can be considered competitive to the <span style="font-family:Verdana;"><span style="font-family:Verdana;">copula<span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;"> methodology. As it is suggested in the paper the possibility of building a common theory of both copulae and joiners is quite possible, and the joiners may play the role of tools within the theory of copulae, and vice versa copulae may, for example, be used for finding proper joiners. Another independent feature of the joiners methodology is the possibility of constructing many new stochastic processes including stationary and Markovian. 展开更多
关键词 Construction of Multivariate Probability Distributions via Joiners Joiner versus Copula Methodology A Possible Fusion of the Two Construction Methods k -Variate Survival function Scheme k = 3 Case
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THE NONLINEAR BOUNDARY VALUE PROBLEM FOR k HOLOMORPHIC FUNCTIONS IN C^(2)
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作者 崔艳艳 李尊凤 +1 位作者 谢永红 乔玉英 《Acta Mathematica Scientia》 SCIE CSCD 2023年第4期1571-1586,共16页
k holomorphic functions are a type of generation of holomorphic functions.In this paper,a nonlinear boundary value problem for k holomorphic functions is primarily discussed on generalized polycylinders in C^(2).The e... k holomorphic functions are a type of generation of holomorphic functions.In this paper,a nonlinear boundary value problem for k holomorphic functions is primarily discussed on generalized polycylinders in C^(2).The existence of the solution for the problem is studied in detail with the help of the boundary properties of Cauchy type singular integral operators with a k holomorphic kernel.Furthermore,the integral representation for the solution is obtained. 展开更多
关键词 k holomorphic functions boundary value problems Cauchy type singular integral operators
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AVERAGE σ-K WIDTH OF CONVOLUTION FUNCTION CLASS OF L_(pq) (R) IN L_q(R)
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作者 Liu Yongping Beijing Normal University. Beijing 《Analysis in Theory and Applications》 1994年第1期34-46,共13页
In this paper. we study the average n-K width of the convolution class B_(pq)(G)(or B_(?)(G)), for which the kernel G(x) is a PF density, in the metric L_q(R)(or L_(qp)(R)) for the case 1≤q<p ≤∞, and obtain some... In this paper. we study the average n-K width of the convolution class B_(pq)(G)(or B_(?)(G)), for which the kernel G(x) is a PF density, in the metric L_q(R)(or L_(qp)(R)) for the case 1≤q<p ≤∞, and obtain some exact results. 展开更多
关键词 IN L_q k WIDTH OF CONVOLUTION function CLASS OF L PQ AVERAGE Math
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Certain Integral Transforms of Generalized k-Bessel Function
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作者 Kottakkaran Sooppy Nisar Waseem Ahmad Khan Mohd Ghayasuddin 《Analysis in Theory and Applications》 CSCD 2018年第2期165-174,共10页
The objective of this note is to provide some(potentially useful) integral transforms(for example, Euler, Laplace, Whittaker etc.) associated with the generalized k-Bessel function defined by Saiful and Nisar [3]. We ... The objective of this note is to provide some(potentially useful) integral transforms(for example, Euler, Laplace, Whittaker etc.) associated with the generalized k-Bessel function defined by Saiful and Nisar [3]. We have also discussed some other transforms as special cases of our main results. 展开更多
关键词 GAMMA function k-Bessel function generalized k-Bessel function INTEGRAL transforms
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Bilayer nicorandil-loaded small-diameter vascular grafts improve endothelial cell function via PI3K/AKT/eNOS pathway
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作者 Zheng Xing Chen Zhao +2 位作者 Chunchen Zhang Yubo Fan Haifeng Liu 《Bio-Design and Manufacturing》 SCIE EI CSCD 2021年第1期72-86,共15页
For the surgical treatment of cardiovascular disease(CVD),there is a clear and unmet need in developing small-diameter(diameter<6 mm)vascular grafts.In our previous work,sulfated silk fibroin(SF)was successfully fa... For the surgical treatment of cardiovascular disease(CVD),there is a clear and unmet need in developing small-diameter(diameter<6 mm)vascular grafts.In our previous work,sulfated silk fibroin(SF)was successfully fabricated as a potential candidate for preparing vascular grafts due to the great cytocompatibility and hemocompatibility.However,vascular graft with single layer is difficult to adapt to the complex internal environment.In this work,polycaprolactone(PCL)and sulfated SF were used to fabricate bilayer vascular graft(BLVG)to mimic the structure of natural blood vessels.To enhance the biological activity of BLVG,nicorandil(NIC),an FDA-approved drug with multi-bioactivity,was loaded in the BLVG to fabricate NIC-loaded BLVG.The morphology,chemical composition and mechanical properties of NIC-loaded BLVG were assessed.The results showed that the bilayer structure of NIC-loaded BLVG endowed the graft with a biphasic drug release behavior.The in vitro studies indicated that NIC-loaded BLVG could significantly increase the proliferation,migration and antioxidation capability of endothelial cells(ECs).Moreover,we found that the potential biological mechanism was the activation of PI3K/AKT/eNOS signaling pathway.Overall,the results effectively demonstrated that NIC-loaded BLVG had a promising in vitro performance as a functional small-diameter vascular graft. 展开更多
关键词 Bilayer vascular grafts NICORANDIL Sulfated silk fibroin Endothelial cell function PI3k/AkT/eNOS pathway
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Wear State Recognition of Drills Based on K-means Cluster and Radial Basis Function Neural Network 被引量:2
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作者 Xu Yang 《International Journal of Automation and computing》 EI 2010年第3期271-276,共6页
Drill wear not only affects the surface smoothness of the hole, but also influences the life of the drill. Drill wear state recognition is important in the manufacturing process, which consists of two steps: first, d... Drill wear not only affects the surface smoothness of the hole, but also influences the life of the drill. Drill wear state recognition is important in the manufacturing process, which consists of two steps: first, decomposing cutting torque components from the original signals by wavelet packet decomposition (WPD); second, extracting wavelet coefficients of different wear states (i.e., slight, normal, or severe wear) with signal features adapting to Welch spectrum. Finally, monitoring and recognition of the feature vectors of cutting torque signal are performed by using the K-means cluster and radial basis function neural network (RBFNN). The experiments on different tool wears of the multivariable features reveal that the results of monitoring and recognition are significant and effective. 展开更多
关键词 Drill wear state recognition cutting torque signals wavelet packet decomposition (WPD) Welch spectrum energy k-means cluster radial basis function neural network
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维生素K的功能、吸收与代谢研究进展 被引量:2
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作者 王海燕 聂淑慧 +1 位作者 胡贻椿 杨晓光 《营养学报》 北大核心 2025年第1期92-98,共7页
近年来,维生素K除了凝血功能之外,还表现出防治骨质疏松、改善心血管疾病、预防糖尿病及特定癌症等多方面的潜在健康效应。本文从生理功能以及转运转化、吸收利用、储存排泄等方面入手,阐述了维生素K_(1)和维生素K_(2)的异同,并综述了... 近年来,维生素K除了凝血功能之外,还表现出防治骨质疏松、改善心血管疾病、预防糖尿病及特定癌症等多方面的潜在健康效应。本文从生理功能以及转运转化、吸收利用、储存排泄等方面入手,阐述了维生素K_(1)和维生素K_(2)的异同,并综述了维生素K的形式、膳食组成及基因多态性(APOE,VKOR,CYP4F2等)对维生素K代谢的影响,为后续维生素K与相关疾病的研究及膳食参考摄入量的制订提供参考。 展开更多
关键词 维生素k 生理功能 吸收 代谢
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Effects of Taohong Siwu Decoction on coagulation function and PI3K/AKT/mTOR pathway after femoral artery anastomosis in rabbits
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作者 Xin-Jun Xie Xian-Min Xie +7 位作者 Gao-Yan Kuang Xiao-Tong Xu Zi-Chen Li Jian-Ping An Zhe Wang Qi Zhou Kai-Feng Yue Zhuo-Ma Dong-Zhi 《Journal of Hainan Medical University》 2021年第19期7-14,共8页
Objective:To observe the effect of Taohong Siyu Decoction on the coagulation function and the signaling pathway of PI3K(phosphatidylinositol 3-kinase)/AKT(protein kinase B)/mTOR(mammalian target of rapamycin)after fem... Objective:To observe the effect of Taohong Siyu Decoction on the coagulation function and the signaling pathway of PI3K(phosphatidylinositol 3-kinase)/AKT(protein kinase B)/mTOR(mammalian target of rapamycin)after femoral artery anastomosis in rabbits.Methods:30 New Zealand white rabbits were divided into blank control group,model control group,papavine hydrochloride injection group and low,medium and high dose groups of Taohong Siwu decoction by random number table method,with 5 rabbits in each group.The rabbits in the model control group,papavine hydrochloride injection group and low,medium and high dose groups of Taohong Siwu decoction were treated with the femoral artery simple intermittent end-to-end suture model.After the successful modeling,the low,medium and high dose groups of Taohong Siwu decoction were given the Taohong Siwu decoction,while the model control group,the blank control group and papavine hydrochloride injection group were given the same amount of normal saline.APTT(activated partial thromboplastin time),FIB(fibrinogen)and PI3K/AKT/mTOR concentrations were measured in aural venous blood samples from six groups of rabbits 30min before operation and 1d,2D,3D and 7d after operation,respectively.Statistical analysis was conducted on the data of the six groups.Results:Compared with blank control group,APTT of model control group was significantly shortened 1d to 7d after operation(P<0.05),FIB values were significantly increased from 1d to 7d after operation(P<0.05);Compared with model control group,APTT in Taohong Siwu decoction low-dose,medium-dose and high-dose groups were significantly prolonged 1d to 7d after operation(P<0.05),FIB value of Taohong Siwu decoction medium and high dose groups decreased significantly from 1d to 7d after operation(P<0.05),the FIB value of Taohong Siwu decoction low-dose group was significantly decreased from 2d to 7d after surgery(P<0.05);Compared with papaverine hydrochloride injection group,APTT in Taohong Siwu decoction medium dose group was significantly prolonged 2d to 7d after surgery(P<0.05),APTT of Taohong Siwu decoction high-dose group was significantly prolonged on 1d to 7d after operation(P<0.05).FIB in Taohong Siwu decoction medium and high dose groups decreased significantly 1d to 7d after operation(P<0.05);Compared with the blank control group,the expression concentrations of PI3K,Akt and mTOR in serum of the model control group were significantly increased from 1d to 7d after surgery(P<0.05);Compared with the model control group,the expression levels of PI3K,Akt and mTOR in serum were significantly increased in the low dose group of Taohong Siwu decoction and Papaverine Hydrochloride Injection group on postoperative 7 days(P<0.05),Taohong Siwu decoction high-dose group was significantly increased from 1d to 7d after surgery(P<0.05),the expression concentrations of PI3K and Akt in Taohong Siwu decoction medium dose group were significantly increased from 2d to 7d after operation(P<0.05),mTOR expression levels were significantly increased from 3d to 7d after operation(P<0.05);Compared with papaverine hydrochloride injection group,the expression concentrations of PI3K,Akt and mTOR in serum of Taohong Siwu decoction medium dose group were significantly increased from 3d to 7d after operation(P<0.05),the expression concentrations of PI3K and mTOR in Taohong Siwu decoction high-dose group were significantly increased from 1d to 7d after operation(P<0.05),and the expression concentration of Akt increased significantly from 3d to 7d after operation(P<0.05).Conclusion:The Taohong Siwu decoction can improve the coagulation function of rabbit femoral artery anastomosis,prevent thrombosis,activate PI3K/Akt/mTOR signaling pathway,promote angiogenesis,and improve tissue ischemia after artery anastomosis. 展开更多
关键词 Arterial anastomosis Vascular crisis Taohong Siwu decoction Papaverine hydrochloride sodium chloride injection PI3k/AkT/MTOR Blood coagulation function
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Different Solid-state Fermentation technology of Functional Red yeast rice has an effect on the morphological change of MonacolinK
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作者 Lei Lu Yao Li Xiuhe Liu 《科技信息》 2014年第12期62-63,67,共3页
Different technical conditions in the process of solid-state fermentation of red yeast rice has a certain impact on the production of acid-form and lactone form Monacolin K.When cultured in the loose rice medium,the a... Different technical conditions in the process of solid-state fermentation of red yeast rice has a certain impact on the production of acid-form and lactone form Monacolin K.When cultured in the loose rice medium,the acid form Monacolin K accounts for 50%-60%;while the acid form Monacolin K accounts for 80%-90%cultured in the consolidated rice medium.And we also found that the proportion of the acid form and lactone form Monacolin K will decrease with the increase of fermentation time. 展开更多
关键词 functionAL RED YEAST rice Monacolin k the acid for
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A SPECIAL MODULUS OF CONTINUITY AND THE K-FUNCTIONAL
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作者 Nadezhda DOLMATOVA 《Acta Mathematica Scientia》 SCIE CSCD 2016年第5期1531-1540,共10页
We consider the questions connected with the approximation of a real continuous 1-periodic functions and give a new proof of the equivalence of the special Boman-Shapiro modulus of continuity with Peetre’s K-function... We consider the questions connected with the approximation of a real continuous 1-periodic functions and give a new proof of the equivalence of the special Boman-Shapiro modulus of continuity with Peetre’s K-functional. We also prove Jackson’s inequality for the approximation by trigonometric polynomials. 展开更多
关键词 modulus of continuity k-functionAL Jackson's theorem
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On Functions of K-Balanced Matroids
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作者 Talal Al-Hawary 《Open Journal of Discrete Mathematics》 2017年第3期103-107,共5页
In this paper, we prove an analogous to a result of Erd&ouml;s and Rényi and of Kelly and Oxley. We also show that there are several properties of k-balanced matroids for which there exists a threshold function.
关键词 k-Balanced MATROID PROJECTIVE Geometry THRESHOLD function
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