马德里卡洛斯三世大学是一所年轻的大学，于1989年建立。为马德里地区七所公立大学之一，与马德里康普顿斯大学、马德里自治大学、马德里理工大学、远程教育国家大学、阿尔卡拉大学与卡洛斯国王大学毗邻。学校的办学理念是重视综合教育，并努力培养“富有责任心、具有敏锐社会问题洞察力、具备超前的 意识、正义感及忍耐力”。创新性是卡洛斯三世大学精神的高度概括，在校学生有18000名。为西班牙第一所将所有的学位课程结合到欧洲高等教育要求的大学。这家大学拥有西班牙最多的双语本科，并且是西班牙第一所提供双学士学位的公立大学。马德里卡洛斯三世大学于2009年被评选为西班牙5所国际优秀校区之一成功跻身西班牙一流大学之列。在经济学及商科领域，该校在全欧洲乃至世界享有极高声誉，在2016年QS全球大学排名位列第51-100名。在最新的2019 QS排名已经上升到全球253名。 大学社区内可享用提供广泛服务的教学设施。大学的设施分布在四个校区内（赫塔菲(Getafe)、莱刚斯(Leganés)、科尔蒙娜尔罗雷霍(Colmenarejo)以及托莱多门(Puerta de Toledo），四个地区都位于马德里自治大区内。赫塔菲校区(Campus de Getafe)包括社会自然科学专业、司法专业、人文专业、通信与音视频数据、莱刚斯校区(Campus de Leganés)则是工程学院及高等理工学院, 科尔蒙娜尔罗雷霍(Campus de Colmenarejo)则是该三项专业的学位教育及学习的地点之一, 而托莱多门校区(Campus de Puerta de Toledo)提供硕士学习。
A new alternative numerical procedure to the Szegő quadrature formulas for the estimation of integrals with respect to a positive Borel measure μ supported on the unit circle is presented. As in many practical situations, we assume that the values of the integrand F are only known at a finite number of points, which we will assume to be equispaced on the unit circle. Our technique consists of obtaining an approximating Laurent polynomial L to F by interpolation in the Hermite sense in a collection of these points that mimic the zeros of a para-orthogonal polynomial with respect to μ, and to use the values of F at the remaining nodes to improve the accuracy of the approximation by a process of simultaneous complex regression. Some numerical examples are carried out.
This article presents a comprehensive verification and validation (V&V) framework for the Laser Interferometer Space Antenna (LISA) drag-free and attitude control system (DFACS). The primary contribution is a structured validation methodology comprising specific test scenarios and an end-to-end campaign that evaluates DFACS performance across the entire operational mode sequence from attitude to science mode. The end-to-end validation considers a statistically relevant and trustworthy Monte Carlo campaign: 1,000 runs in a high-fidelity, nonlinear simulation environment accounting for parametric uncertainties and varying initial conditions during test-mass release. The analysis examines the performance requirements for each operational mode as well as the effects of mode transitions. The proposed framework is applied for the analysis of a DFACS that is composed of a set of robust structured H∞ controllers and uses an operational mode strategy designed to minimize transients due to hardware changes and controllers’ switches. The results demonstrate that the proposed robust-control-based DFACS, combined with the proposed operational mode strategy, ensures smooth transitions to reach the science mode. Furthermore, the findings highlight the advantages of employing a robust control framework in both the design and performance evaluation of LISA’s DFACS.
Personal network size is a versatile and fundamental structural network measure, capturing the total number of personal connections or specific subgroups within an individual’s social environment. In standard sociological methods, such as surveys, personal network size is often indirectly inferred from name generators, which are used to list alters from the respondents’ personal networks. Implicitly, a higher count of named alters is assumed to indicate a larger personal network. We explicitly test this common assumptionand address this imprecise association between network size and number of listed alters by comparing the results from two very distinct approaches to measuring personal network size: alter counts derived from name generators and size estimates obtained from the network scale-up method (NSUM). Using survey data from over 300 participants in Spain, we compute these two independent network measures for the same respondents and assess the strength, significance and robustness of their association, including potential question-order effects on personal network size. Our analyses conclude that the alter counts from name generators primarily reflect participants’ response behaviour and task constraints rather than the underlying personal network size. Finally, our findings highlight critical limitations in the use of free name generators as proxies for personal network size.
The dynamics of a planar premixed flame is analyzed using the Zel'dovich-Li & ntilde;& aacute;n-Dold two-step chemical-kinetic mechanism. The chemistry model involves an initial autocatalytic reaction with large activation energy converts the premixed fuel into intermediate radical species without heat release, followed by a temperature-independent recombination reaction that releases heat and produces the final combustion products. Focusing on low-diffusivity conditions, we revisit the modal stability of planar deflagrations and compare the results with asymptotic predictions obtained in the high-activation-energy limit. To characterize transient amplification mechanisms at finite activation energies, the stability analysis is further extended through pseudospectral and endogeneity analyses, which quantify the intrinsic sensitivity of the system to perturbations and identify the regions that most strongly influence its dynamical behavior. The adjoint-based analysis reveals transient-growth dynamics closely consistent with the optimal-response predictions. In particular, significant transient growth is observed even when the flame is linearly stable for modal disturbances, suggesting the possibility of triggering nonlinear dynamics that may ultimately lead to flame extinction. These findings are further supported by nonlinear time-dependent simulations, which reveal distinct regimes of transient flame evolution, including stable propagation, global instability, and extinction events associated with transient growth phenomena.
