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Power Flow Analytical Solutions and Multi-dimensional Voltage Stability Boundaries Based on Multivariate Quotient-difference Method

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CSEE Journal of Power and Energy Systems 2024年第3期10卷 1168-1178页

作者： Chengxi Liu Qiupin lai School of Electrical Engineering and Automation Wuhan UniversityWuhan 430072China Hubei Engineering and Technology Research Center for AC/DC Intelligent Distribution Network Wuhan 430072China IEEE

This paper proposes a novel Multivariate Quotient-Difference(MQD)method to obtain the approximate analytical solution for AC power flow ***,in the online environment,the power flow solutions covering different operating conditions can be directly obtained by plugging values into multiple symbolic variables,such that the power injections and consumptions of selected buses or areas can be independently *** method first derives a power flow solution through a Multivariate Power Series(MPS).Next,the MQD method is applied to transform the obtained MPS to a Multivariate Pad´e Approximants(MPA)to expand the Radius of Convergence(ROC),so that the accuracy of the derived analytical solution can be significantly *** addition,the hypersurface of the voltage stability boundary can be identified by an analytical formula obtained from the coefficients of *** direct method for power flow solutions and voltage stability boundaries is fast for many online applications,since such analytical solutions can be derived offline and evaluated online by only plugging values into the symbolic variables according to the actual operating *** proposed method is validated in detail on New England 39-bus and IEEE 118-bus systems with independent load variations in multi-regions.

关键词： Analytical power flow solution multivariate power series multivariate Padéapproximants multivariate quotient-difference multi-dimensional voltage stability boundary

Speckle-type POZ protein mutations interrupt tumor suppressor function of speckle-type POZ protein in prostate cancer by affecting androgen receptor degradation

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Asian Journal of Andrology 2014年第5期16卷 659-660页

作者： John lai Cancer Program Institute of Health and Biomedical Innovation Queensland University of Technology Brisbane Queensland Australia Australian Prostate Cancer Research Centre-Queensland Translational Research Institute Queensland University of Technology Brisbane Queensland Australia

Large scale exome sequencing studies have ＇revealed regions of the genome, which contribute to the castrate resistant prostate cancer （CRPC） phenotype.1-3 Such studies have identified mutations in genes, which may have diagnostic/prognostic potential, or which may be targeted therapeutically. Two of these genes include the androgen receptor （AR） and speckle-type POZ protein （SPOP） genes. However, the findings from these exome sequencing studies can only be translated therapeutically once the functional consequences of these mutations have been determined. Here, we highlight the recent study by An et al.4 which investigated the functional effects of mutations in the SPOP gene that were identified in the aforementioned exome sequencing studies, particnlarly in the context of SPOP-mediated degradation of the AR.

关键词： Speckle-type POZ protein

Molecular nature of sulfhydryl modification by hydrogen peroxide on type 1 ryanodine receptor

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Acta Pharmacologica Sinica 2006年第7期27卷 888-894页

作者： Anthony F lai Cardiff CF14 4XN Cardiff University UK Wales Heart Research Institute Wales College of Medicine

Aim:To elucidate the molecular nature of sulfhydryl modification by hydrogenperoxide on type 1 ryanodine receptor(RyR1).Methods:Rabbit skeletal musclesarcoplasmic reticulum was treated with hydrogen peroxide,then RyR1 complexwas *** proteins in the complex were analysed by electrophoresis,Western blot and electron ***:(1)Hydrogen peroxide inducesinter-subunit cross-linking within the tetrameric RyR1 molecule;(2)in parallel tointer-subunit cross-linking,the RyR1 molecule changes morphology;(3)the chemi-cal and morphological changes are reversible:upon reduction by reducing agents,the RyR1 molecule regains its original ***:These findings suggestthat the molecular mechanism of RyR1 channel activity in sarcoplasmic reticulumregulated by hydrogen peroxide is through inter-subunit cross-linking within thetetrameric RyR1 molecule,which in turn induces structural changes of RyR1.

关键词： Ca2+ release channel/ryanodine receptor hydrogen peroxide reactive oxygen redoxsensitive ion channel

A Criterion for Elliptic Curves with Second Lowest 2-Power in L(1)(Ⅱ)

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Acta Mathematica Sinica,English Series 2005年第5期21卷 961-976页

作者： Chun lai ZHAO LMAM School of Mathematical Sciences Peking University Beijing 100871 P. R. China

Let D = p1p2 …pm, where p1,p2, ……,pm are distinct rational primes with p1 ≡p2 ≡3（mod 8）, pi =1（mod 8）（3 ≤ i ≤ m）, and m is any positive integer. In this paper, we give a simple combinatorial criterion for the value of the complex L-function of the congruent elliptic curve ED2 ： y^2 = x^3- D^2x at s = 1, divided by the period ω defined below, to be exactly divisible by 2^2m-2, the second lowest 2-power with respect to the number of the Gaussian prime factors of D. As a corollary, we obtain a new series of non-congruent numbers whose prime factors can be arbitrarily many. Our result is in accord with the predictions of the conjecture of Birch and Swinnerton-Dyer.

关键词： Elliptic curve L-function Congruent number BSD conjecture

Preface to the Special Issue:Additive Manufacturing—Expanding Production Horizon

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Acta Metallurgica Sinica(English Letters) 2024年第1期37卷 1-2页

作者： lai-Chang Zhang Centre for Advanced Materials and Manufacturing School of EngineeringEdith Cowan University270 Joondalup DriveJoondalupPerthWA6027Australia

Additive manufacturing(AM),commonly known as 3D printing,has become a transformative technology that has a profound impact on various industrial *** encompasses a set of techniques for building objects layer by layer from digital *** conventional subtractive manufacturing methods that involve removing material from large blocks,AM adds material incrementally,providing unprecedented design flexibility and efficiency.

关键词： removing printing Expanding

Separability criteria based on a class of symmetric measurements

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Communications in Theoretical Physics 2023年第6期75卷 51-58页

作者： Lemin lai Shunlong Luo Academy of Mathematics and Systems Science Chinese Academy of SciencesBeijing 100190China School of Mathematical Sciences University of Chinese Academy of SciencesBeijing 100049China

Highly symmetric quantum measurements,such as mutually unbiased measurements(MUMs)and general symmetric informationally complete positive-operator-valued measures(GSICPOVMs),play an important role in both foundational and practical aspects of quantum information ***,a broad class of symmetric measurements were introduced[K Siudzińska,(2022)***.A 105,042209],which can be viewed as a common generalization of MUMs and *** this work,the role of these symmetric measurements in entanglement detection is *** specifically,based on the correlation matrices defined via(informationally complete)symmetric measurements,a separability criterion for arbitrary dimensional bipartite systems is *** is shown that the criterion is stronger than the method provided by Siudzińska,meanwhile,it can unify several popular separability criteria based on MUMs or ***,using these(informationally complete)symmetric measurements,two efficient criteria are presented to detect the entanglement of tripartite quantum *** detection power and advantages of these criteria are illustrated through several examples.

关键词： entanglement detection separability criterion symmetric measurement correlation matrix

Coupled effects of climate change and human activities on vegetation dynamics in the Southwestern Alpine Canyon Region of China

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Journal of Mountain Science 2024年第10期21卷 3234-3248页

作者： lai Jinlin QI Shi School of Soil and Water Conservation Beijing Forestry UniversityBeijing 100083China

The driving effects of climate change and human activities on vegetation change have always been a focal point of ***,the coupling mechanisms of these driving factors across different temporal and spatial scales remain *** Southwestern Alpine Canyon Region of China(SACR),as an ecologically fragile area,is highly sensitive to the impacts of climate change and human *** study constructed a vegetation cover dataset for the SACR based on the Enhanced Vegetation Index(EVI)from 2000 to *** autocorrelation,Theil-Sen trend,and Mann-Kendall tests were used to analyze the spatiotemporal characteristics of vegetation cover *** main drivers of spatial heterogeneity in vegetation cover were identified using the optimal parameter geographic detector,and an improved residual analysis model was employed to quantify the relative contributions of climate change and human activities to interannual vegetation cover *** main findings are as follows:Spatially,vegetation cover exceeds 60%in most areas,especially in the southern part of the study ***,the border area between Linzhi and Changdu exhibits lower vegetation *** factors are the primary drivers of spatial heterogeneity in vegetation cover,with temperature having the most significant influence,as indicated by its q-value,which far exceeds that of other ***,the interaction q-value between the two factors significantly increases,showing a relationship of bivariate enhancement and nonlinear *** terms of temporal changes,vegetation cover shows an overall improving trend from 2000 to 2020,with significant increases observed in 68.93%of the study *** these,human activities are the main factors driving vegetation cover change,with a relative contribution rate of 41.31%,while climate change and residual factors contribute 35.66%and 23.53%,*** thoroughly exploring the coupled mechanisms of vegetation change,this

关键词： Enhanced vegetation index Climate change Human activities Spatial heterogeneity Coupled mechanisms

Relationship between Atmospheric Heat Source over the Tibetan Plateau and Precipitation in the Sichuan–Chongqing Region during Summer

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Journal of Meteorological Research 2017年第3期31卷 555-566页

作者： Xin lai Yuanfa GONG College of Atmospheric Sciences Chengdu University of Information Technology (CUIT)/Plateau Atmosphere and Environment Key Laboratory of Sichuan Provinceand Joint Laboratory of Climate and Environment Change of CUIT

NCEP-NCAR reanalysis data and a 47-yr daily precipitation dataset from a network of 42 rain gauges are used to analyze the atmospheric heat source （〈Q1〉） anomaly over the Tibetan Plateau （TP） and its influence on the summer precipitation anomaly in the Sichuan-Chongqing region. Results show that the vertical advection of 〈Ql〉 over the central TP is a major factor affecting summer precipitation in the Sichuan-Chongqing region. When the vertical ad- vection of〈Q1〉 over the central TP is strengthened, the South Asian high shifts further than normal to the south and east, the western Pacific subtropical high shifts further than normal to the south and west, and the Indian low weak- ens. This benefits the transport of warm moist air from the low latitude oceans to the Sichuan-Chongqing region. Correspondingly, in the high latitudes, two ridges and one trough form, which lead to cool air moving southward. These two air masses converge over the Sicbuan -chongqing region, leading to significant precipitation. In contrast, when the vertical advection of 〈Q1〉 over the central TP is weakened, the South Asian high moves to the north and west, the subtropical high moves eastward and northward, and the Indian low strengthens. This circulation pattern is unfavorable for warm air advection from the south to the Sichuan-Chongqing region, and the cool air further north cannot move southward because of the presence of two troughs and one ridge at high latitude. Thus, ascent over the Sichuan-Chongqing region is weakened, resulting in less precipitation.

关键词： Tibetan Plateau atmospheric heating source/sink Sichuan-Chongqing region precipitation variability

Mathematical modeling of cancer treatment with radiation and PD-L1 inhibitor

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Science China Mathematics 2020年第3期63卷 465-484页

作者： Xiulan lai Avner Friedman Institute for Mathematical Sciences Renmin University of ChinaBeijing 100872China Mathematical Bioscience Institute&Department of Mathematics Ohio State UniversityColumbusOH 43210USA

Radiation therapy is a longstanding cancer treatment. More recently, it has been demonstrated that radiation therapy(RT) elicits anti-cancer immune response. For this reason, there is a growing interest in combining RT with immunotherapy, specifically with checkpoint inhibitors such as anti-CTLA-4 and anti-PDL1. In the present paper, we develop a mathematical model of combination therapy with RT and *** model is used to compare different schedules in clinical trials. Simulations of the model show that applying both RT and anti-PD-L1 at the same week has more benefits than applying them in separate adjacent ***, applying anti-PD-L1 before RT has more benefits than applying RT before anti-PD-L1.

关键词： mathematical model anti-PD-L1 radiotherapy combination therapy scheduling