Understanding the Relationship Between Shrinking Cities and Land Prices:Spatial Pattern,Effectiveness,and Policy Implications

Urban shrinkage has emerged as a widespread phenomenon globally and has a significant impact on land,particularly in terms of land use and price.This study focuses on 2851 county-level cities in China in 2005–2018(excluding Hong Kong,Macao,Taiwan,and‘no data’areas in Qinhai-Tibet Plateau)as the fundamental units of analysis.By employing nighttime light(NTL)data to identify shrinking cities,the propensity score matching(PSM)model was used to quantitatively examine the impact of shrinking cities on land prices,and evaluate the magnitude of this influence.The findings demonstrate the following:1)there were 613 shrinking cities in China,with moderate shrinkage being the most prevalent and severe shrinkage being the least.2)Regional disparities are evident in the spatial distribution of shrinking cities,especially in areas with diverse terrain.3)The spatial pattern of land price exhibits a significant correlated to the economic and administrative levels.4)Shrinking cities significantly negatively impact on the overall land price(ATT=–0.1241,P<0.05).However,the extent of the effect varies significantly among different spatial regions.This study contributes novel insights into the investigation of land prices and shrinking cities,ultimately serving as a foundation for government efforts to promote the sustainable development of urban areas.

Generating Sets of the Complete Semigroup of Binary Relations Defined by Semilattices of the Class Σ8(X, 5)

In this article, we study generating sets of the complete semigroups of binary relations defined by X-semilattices of unions of the class Σ8(X, 5). Found uniquely irreducible generating set for the given semigroups and when X is finite set formulas for calculating the number of elements in generating sets are derived.

Tunable dispersion relations manipulated by strain in skyrmion-based magnonic crystals

We theoretically investigate the propagation characteristics of spin waves in skyrmion-based magnonic crystals. It is found that the dispersion relation can be manipulated by strains through magneto-elastic coupling. Especially, the allowed bands and forbidden bands in dispersion relations shift to higher frequency with strain changing from compressive to tensile,while shifting to lower frequency with strain changing from tensile to compressive. We also confirm that the spin wave with specific frequency can pass the magnonic crystal or be blocked by tuning the strains. The result provides an advanced platform for studying the tunable skyrmion-based spin wave devices.

Enhancing Data Forwarding Efficiency in SIoT with Multidimensional Social Relations

Effective data communication is a crucial aspect of the Social Internet of Things(SIoT)and continues to be a significant research focus.This paper proposes a data forwarding algorithm based on Multidimensional Social Relations(MSRR)in SIoT to solve this problem.The proposed algorithm separates message forwarding into intra-and cross-community forwarding by analyzing interest traits and social connections among nodes.Three new metrics are defined:the intensity of node social relationships,node activity,and community connectivity.Within the community,messages are sent by determining which node is most similar to the sender by weighing the strength of social connections and node activity.When a node performs cross-community forwarding,the message is forwarded to the most reasonable relay community by measuring the node activity and the connection between communities.The proposed algorithm was compared to three existing routing algorithms in simulation experiments.Results indicate that the proposed algorithmsubstantially improves message delivery efficiency while lessening network overhead and enhancing connectivity and coordination in the SIoT context.

Explanation of Two Important Empirical Relations for Galaxies

The phenomenon of “missing mass” in galaxies has triggered new theoretical exploration, forming a competition between dark matter assumption, modified Newtonian dynamics and modified gravity. Over the past forty years, various versions of the modified scenario have been proposed to simulate the effects of missing mass. These schemes replace the dynamic effect of dark matter by introducing some tiny extra force terms in the dynamic equations. Such extra forces have mainly interactions on large scales of galaxies, such as fitting the Tully-Fisher relation or asymptotically flat rotation curves. The discussion in this paper shows that the evidence of taking the modified schemes as fundamental theory is still insufficient. In this paper, we display a system of simplified galactic dynamical equations derived from weak field and low-speed approximations of Einstein field equations, and then we use it to discuss two important empirical relations in galactic dynamics, namely the Faber-Jackson relation and Tully-Fisher relation, as well as the related fundamental plane. These discussions provide a reference scheme for improving the dispersion of the empirical relations, and also provide a theoretical foundation to analyze the properties of dark matter and galactic structures.

稀疏图的r-动态染色

通过分析极小反例的结构性质,运用权转移的方法,研究了对于mad(G)<14/5的稀疏图G的r-动态染色数,证明了对于满足mad(G)<14/5的图G,若r≥9,则χr(G)≤r+2.研究结果推广了稀疏图r-动态染色的已知结果.

miR-25a-5p促进乳腺癌蒽环类药物治疗所致的心肌损伤

目的:探讨蒽环类药物诱导心肌毒性的机制和新的治疗靶点。方法:106例乳腺癌患者根据超声心动图检查鉴别出肿瘤治疗相关心功能障碍,分为心功能障碍组及对照组。通过微阵列技术高通量筛选两组患者差异表达miRNA。体外构建蒽环类药物诱导H9C2心肌细胞损伤模型,通过调控miR-25a-5p的表达,观察miR-25a-5p在蒽环类药物诱导H9C2心肌细胞损伤中的作用。结果:乳腺癌患者中9例发生肿瘤治疗相关心功能障碍,并从两组患者中鉴定出9个差异表达的miRNA。其中8个miRNA在体外模型中进一步得到验证,尤其是miR-25a-5p。通过上调miR-25a-5p,可进一步加重蒽环类药物诱导心肌细胞氧化损伤。结论:miR-25a-5p促进蒽环类药物诱导的心肌损伤,可能是新的生物标志物及治疗靶点。

Preliminary results on a near-real-time rock slope damage monitoring system based on relative velocity changes following the September 5,2022 M_(S) 6.8 Luding,China earthquake

Relative seismic velocity change(dv/v)is important for monitoring changes in subsurface material properties and evaluating earthquake-induced rock slope damage in a geological disaster-prone region.In this paper,we present a rapid damage assessment on three slow-moving rock slopes by measuring dv/v decrease caused by the 2022 M_(S) 6.8 Luding earthquake in Southwest China.By applying the stretching method to the cross-correlated seismic wavefields between sensors installed on each slope,we obtain earthquake-induced dv/v decreases of~2.1%,~0.5%,and~0.2%on three slopes at distances ranging from~86 to~370 km to the epicenter,respectively.Moreover,based on seismic data recorded by 16 sensors deployed on the rock slope at a distance of~370 km away from the epicenter,a localized dv/v decease region was observed at the crest of the slope by calculating the spatial dv/v images before and after the earthquake.We also derive an empirical in situ stress sensitivity of -7.29×10^(-8)/Pa by relating the dv/v change to the measured peak dynamic stresses.Our results indicate that a rapid dv/v assessment not only can help facilitate on-site emergency response to earthquakeinduced secondary geological disasters but also can provide a better understanding of the subsurface geological risks under diverse seismic loadings.

血清miR-130a表达水平与COPD急性加重期患者近期预后不良的临床关系

目的 探讨慢性阻塞性肺疾病急性加重期(AECOPD)患者血清微小核糖核酸-130a(miR-130a)表达水平及其与近期预后不良的关系。方法 选取2019年6月—2021年6月武汉市第三医院收治的85例AECOPD患者和门诊随诊的66例慢性阻塞性肺疾病(COPD)稳定期患者,分别设为AECOPD组和COPD组,另同期选取70例健康者设为对照组,三组均检测血清miR-130a表达水平。根据AECOPD患者入院28 d预后情况将其分为预后良好组及预后不良组,分析血清miR-130a表达水平与AECOPD患者预后的关系及其预测价值。结果 AECOPD组和COPD组血清miR-130a表达水平均高于对照组(P<0.05),且AECOPD组血清miR-130a表达水平高于COPD组(P<0.05);85例AECOPD患者入院28 d预后不良发生率为41.18%;年龄大、吸烟史、合并冠心病、动脉氧分压低、血清miR-130a表达水平高及机械通气均是AECOPD患者近期预后不良的危险因素(P<0.05);血清miR-130a表达水平预测AECOPD近期预后不良的灵敏度、特异度、曲线下面积分别为85.71%、74.00%、0.813。结论 AECOPD患者血清miR-130a水平呈高表达,与近期预后密切相关,是近期预后不良的危险因素,并对近期预后不良具有一定的预测价值。

miR-10b介导NKG2D调节脑胶质瘤细胞免疫效应的实验研究

目的:观察微小核糖核酸-10b(miR-10b)对脑胶质瘤细胞免疫效应的调节作用并探讨其作用机制。方法:取人脑胶质瘤细胞U251进行培养和传代,获得处于对数生长期的细胞。按照1.0×105个/ml浓度制备细胞悬液,并设置对照组、过表达组、低表达组、空白组,每组6个复孔。对照组、过表达组、低表达组分别采用脂质体转染法转染阴性对照、miR-10b模拟物、miR-10b抑制剂,空白组予以等量无菌生理盐水。分离和培养1例健康志愿者外周血自然杀伤(NK)细胞。MTT法检测不同效靶比时NK细胞的杀伤活性;流式细胞仪检测各组NK细胞表面NK细胞激活受体(NKG2D)表达,并检测各组人脑胶质瘤细胞U251表面主要组织相容性复合物Ⅰ链相关基因A(MICA)、UL16结合蛋白2(ULBP2)、UL16结合蛋白3(ULBP3)表达。结果:对照组、过表达组、低表达组转染效率分别为(93.55±2.05)%、(95.67±3.14)%、(94.18±3.26)%;与对照组和空白组相比,过表达组miR-10b表达升高,低表达组miR-10b表达降低,差异均有统计学意义(P<0.05),且对照组和空白组miR-10b表达差异无统计学意义(P>0.05);与对照组和空白组相比,过表达组NK细胞不同效靶比杀伤活性均降低、NKG2D表达降低,低表达组NK细胞不同效靶比杀伤活性均增高、NKG2D表达增高,差异均有统计学意义(P<0.05),各组NK细胞杀伤活性均随效靶比增加而增高,差异均有统计学意义(P<0.05),且对照组与空白组相比,相同效靶比NK细胞杀伤活性、NKG2D表达差异均无统计学意义(P>0.05);与对照组和空白组相比,过表达组人脑胶质瘤细胞U251表面MICA、ULBP2、ULBP3表达均降低,低表达组人脑胶质瘤细胞U251表面MICA、ULBP2、ULBP3表达均增高,差异均有统计学意义(P<0.05),且对照组与空白组人脑胶质瘤细胞U251表面MICA、ULBP2、ULBP3表达差异均无统计学意义(P>0.05)。结论:抑制miR-10b表达能够增加NK细胞表面NKG2D和人脑胶质瘤细胞U251表面MICA、ULBP2、ULBP3表达,增强NK细胞对人脑胶质瘤细胞U251的杀伤活性。

The surface plasmon polariton dispersion relations in a nonlinear-metal-nonlinear dielectric structure of arbitrary nonlinearity

The analytic surface plasmon polaritons （SPPs） dispersion relation is studied in a system consisting of a thin metallic film bounded by two sides media of nonlinear dielectric of arbitrary nonlinearity is studied by applying a generalised first integral approach. We consider both asymmetric and symmetric structures. Especially, in the symmetric system, two possible modes can exist： the odd mode and the even mode. The dispersion relations of the two modes are obtained. Due to the nonlinear dielectric, the magnitude of the electric field at the interface appears and alters the dispersion relations. The changes in SPPs dispersion relations depending on film thicknesses and nonlinearity are studied.

Influence of slope position and aspect on the vegetation attributes and treewater relations in forests of the central Himalayas

While the need for understanding the effects of topographical factors on forest structure and function is well recognized,comprehensive studies are scarce.This study evaluates the effect of slope aspect and slope position on water relations and forest attributes across six forest types occurring between 400 m and 2600 m altitude in the Central Himalaya(27°-38°N).We found that predawn tree water potential and soil water potential were generally higher on moist north slope aspect(-0.78±0.05 MPa and-3.34±0.18 MPa,respectively)than dry south slope aspect(-0.82±0.18 MPa and-3.77±0.18 MPa,respectively).Across six different forests,these values were higher at hill base(-0.71±0.06 MPa and-2.77±0.19 MPa,tree predawn water potential and soil water potential,respectively)than other topographical positions.The favorable effect of north aspect and hill base was also observed in maintaining soil water and tree water potential during the dry season.Vegetation attributes,such as species richness,unique species and plant density were also generally higher on north slope and hill base than southern aspect and lowest at hill top.Across forest types,the hill base provided shelter to 46 unique species,compared to 16-18 at the other positions,thus emphasizing its importance as refugia for species to survive climate change induced perturbations.The favorable conditions of hill base position not only contribute to increase in alpha diversity,but also to extended species distributional range.

具有中间幂等元的r-宽大半群

讨论了r-宽大半群上的中间幂等元及其相关幂等元的性质.借此,证明了具有弱型A可乘中间幂等元u的r-宽大半群是自然序r-宽大半群,其中u是最大幂等元.

黄花苜蓿MfMYB3R-3基因克隆及结构与功能的生物信息学分析

MYB转录因子是植物中分布最广的转录因子家族之一,在植物响应生物及非生物胁迫,调控逆境胁迫相关基因表达方面起着重要的作用。本研究基于黄花苜蓿转录组数据,鉴定和克隆了黄花苜蓿MfMYB3R-3基因,并进行了生物信息学分析。结果表明,MfMYB3R-3基因CDS区长1701 bp,编码566个氨基酸,具有SANT保守结构域,为MYB3R型转录因子;MfMYB3R-3蛋白化学分子式为C_(2690)H_(4314)N_(796)O_(873)S_(20),理论等电点为8.75,该蛋白是亲水性不稳定偏碱性非分泌蛋白,不具有信号肽,无跨膜结构,亚细胞定位预测在细胞核。系统进化分析发现,黄花苜蓿MfMYB3R-3蛋白与蒺藜苜蓿的MYB3R-3的亲缘关系最近。

BARN:Behavior-Aware Relation Network for multi-label behavior detection in socially housed macaques

Quantification of behaviors in macaques provides crucial support for various scientific disciplines,including pharmacology,neuroscience,and ethology.Despite recent advancements in the analysis of macaque behavior,research on multi-label behavior detection in socially housed macaques,including consideration of interactions among them,remains scarce.Given the lack of relevant approaches and datasets,we developed the Behavior-Aware Relation Network(BARN)for multi-label behavior detection of socially housed macaques.Our approach models the relationship of behavioral similarity between macaques,guided by a behavior-aware module and novel behavior classifier,which is suitable for multi-label classification.We also constructed a behavior dataset of rhesus macaques using ordinary RGB cameras mounted outside their cages.The dataset included 65?913 labels for19 behaviors and 60?367 proposals,including identities and locations of the macaques.Experimental results showed that BARN significantly improved the baseline SlowFast network and outperformed existing relation networks.In conclusion,we successfully achieved multilabel behavior detection of socially housed macaques with both economic efficiency and high accuracy.

Interpersonal Perception in Virtual Groups: Examining Homophily, Identification and Individual Attraction Using Social Relations Model in Network

With the penetration of the Internet, virtual groups have become more and more popular. The reliability and accuracy of interpersonal perception in the virtual environment is an intriguing issue. Using the Social relations model (SRM) [1], this paper investigates interpersonal perception in virtual groups from a multilevel perspective. In particular, it examines the following three areas: homophily, identification, and individual attraction, and explores how much of these directional and dyadic relational evaluations can be attributed to the effect of the actor, the partner, and the relationship.

Solving Arithmetic Word Problems of Entailing Deep Implicit Relations by Qualia Syntax-Semantic Model

Solving arithmetic word problems that entail deep implicit relations is still a challenging problem.However,significant progress has been made in solving Arithmetic Word Problems(AWP)over the past six decades.This paper proposes to discover deep implicit relations by qualia inference to solve Arithmetic Word Problems entailing Deep Implicit Relations(DIR-AWP),such as entailing commonsense or subject-domain knowledge involved in the problem-solving process.This paper proposes to take three steps to solve DIR-AWPs,in which the first three steps are used to conduct the qualia inference process.The first step uses the prepared set of qualia-quantity models to identify qualia scenes from the explicit relations extracted by the Syntax-Semantic(S2)method from the given problem.The second step adds missing entities and deep implicit relations in order using the identified qualia scenes and the qualia-quantity models,respectively.The third step distills the relations for solving the given problem by pruning the spare branches of the qualia dependency graph of all the acquired relations.The research contributes to the field by presenting a comprehensive approach combining explicit and implicit knowledge to enhance reasoning abilities.The experimental results on Math23K demonstrate hat the proposed algorithm is superior to the baseline algorithms in solving AWPs requiring deep implicit relations.

A Testing Time for U.S.-China Relations

While the unipolar world is still orbiting in the sphere of influence of Anglo-American elite and some of their allies,the rest of the world is marching in a different direction.THE year 2022 proved to be a turbulent one for U.S.-China relations.

Picture Fuzzy Relations over Picture Fuzzy Sets

Nowadays, picture fuzzy set theory is a flourishing field in mathematics with uncertainty by incorporating the concept of positive, negative and neutral membership degrees of an object. A traditional crisp relation represents the satisfaction or the dissatisfaction of relationship, connection or correspondence between the objects of two or more sets. However, there are some problems that can’t be solved through classical relationships, such as the relationship between two objects being vague. In those situations, picture fuzzy relation over picture fuzzy sets is an important and powerful concept which is suitable for describing correspondences between two vague objects. It represents the strength of association of the elements of picture fuzzy sets. It plays an important role in picture fuzzy modeling, inference and control system and also has important applications in relational databases, approximate reasoning, preference modeling, medical diagnosis, etc. In this article, we define picture fuzzy relations over picture fuzzy sets, including some other fundamental definitions with illustrations. The max-min and min-max compositions of picture fuzzy relations are defined in the light of picture fuzzy sets and discussed some properties related to them. The reflexivity, symmetry and transitivity of a picture fuzzy relation are described over a picture fuzzy set. Finally, various properties are explored related to the picture fuzzy relations over a picture fuzzy set.

A Study of the Effects of Employee Engagement on Job Satisfaction:Mediating Effect of Labor Relations Climate

With the rapid advancement of new technologies and the transformation of the economic model on a global scale,enterprises are facing unprecedented changes in the external environment and more diversified demands from employees.Therefore,it is essential for enterprises to bolster employee engagement by enhancing employees’job satisfaction,building a stable and harmonious internal climate,and adapting to the dynamic,complex external environment.This study analyzes the positive effects of employee engagement on job satisfaction,explores the mediating effect of labor relations climate in the relationship between the two,and proposes corresponding practical countermeasures and suggestions.