The alpha method for solving differential algebraic inequality (DAI) systems

This paper describes an algorithm for ``direct numerical integration'' of the initial value Differential-Algebraic Inequalities (DAI) in a time stepping fashion using a sequential quadratic programming (SQP) method solver for detecting and satisfying active path constraints at each time step. The activation of a path constraint generally increases the condition number of the active discretized differential algebraic equation's (DAE) Jacobian and this difficulty is addressed by a regularization property of the alpha method. The algorithm is locally stable when index 1 and index 2 active path constraints and bounds are active. Subject to available regularization it is seen to be stable for active index 3 active path constraints in the numerical examples. For the high index active path constraints, the algorithm uses a user-selectable parameter to perturb the smaller singular values of the Jacobian with a view to reducing the condition number so that the simulation can proceed. The algorithm can be used as a relatively cheaper estimation tool for trajectory and control planning and in the context of model predictive control solutions. It can also be used to generate initial guess values of optimization variables used as input to inequality path constrained dynamic optimization problems. The method is illustrated with examples from space vehicle trajectory and robot path planning.

Preliminary note on the biochemical composition of meat of dai (Chirocentrus spp) and kati (Opisthopterus spp)

Studies were taken up biochemical composition of Chirocentrus dorab and Opisthopterus sp. The seasonal changes, yield of mince and energy value of the meat were also reported.

Features of wave field, its effect to erosion - deposition processes in the Cua Dai (Hoi An), Cai river mouth (Nha Trang) and Phan Thiet Bay in typical local wind conditions

Based on the hydrodynamic model and Shore Protection Manual (CERC - USA) we have calculated wave field characteristics in the typical wind conditions (wind velocity equal to 13m/s in the high frequency direction of the wind regime). Comparison between measured and calculated wave parameters was presented and these results were corresponded to each other. The following main wave characteristics were calculated: -Pattern of the refraction wave field. -Average wave height field. -Longshore current velocity field in surf zone. From distribution features of wave field characteristics in research areas, it could be summarized as following: - The formation of wave fields in the research areas was unequal because of their local difference of hydrometeorological conditions, river discharge, bottom relief… - At Cuadai (Dai mouth, Hoian) area in the N direction of incident wave field, wave has caused serious variation of the coastline. The coastline in the whole region, especially, at the south of the mouth was eroded and the foreland in the north of the mouth was deposited. - At Cai river mouth (Nhatrang) area in the E direction of incident wave field, wave has effected strongly and directly to the inshore and channel structure. - At Phanthiet bay area in the SW direction of incident wave field, wave has effected strongly to the whole shoreline from Da point to Ne point and caused serious erosion.

An investigation of the mathematical elements of the Dai culture south-west Yunnan province, China

Dai ethnic mathematical culture is an important part of Dai ethnic culture. Mathematical elements show in their daily life. Through a research project of the Yunnan Dehong Dai people in southwest China, We collected the first-hand information, tried to do a small investigative study, and collected mathematics teaching resources that is useful to primary and secondary schools students on mathematics learning  in this minority areas. Keyword: Dai ethnic; Mathematical culture; Primary and secondary schools; Teaching resources.

Napoli dai Camaldoli : [vue générale de la baie de Naples depuis Camaldoli] : [peinture]

Collectionneur : Lesouëf, Auguste (1829-1906)

Napoli dai Pontirossi : [vue générale de la baie de Naples depuis Ponti Rossi] : [peinture]

Collectionneur : Lesouëf, Auguste (1829-1906)

Baia dai Camaldoli : [vue générale de la baie] : [peinture]

Collectionneur : Lesouëf, Auguste (1829-1906)

代數學Dai shu xue.De Morgan's Algebra.

Traduction Chinoise par Alexander Wylie (1815-1887), rédigée par Li Shan lan, de Hai ning. Préface Chinoise par Wylie (1859) ; préface anglaise, écrite par le même à Shang hai (octobre 1859), contenant un historique des mathématiques en Chine. Imprimé en caractères mobiles, dans la maison Mo hai (1859).Livre préliminaire + 13 livres.

代微積拾級Dai wei ji shi ji.Loomis' Analytical Geometry and Differential and Integral Calculus.

Traduction de Wylie, rédigée par Li Shan lan ; préfaces Chinoises des deux traducteurs (1859) ; préface anglaise, écrite à Shang hai par A. Wylie (juillet 1859). Liste de termes techniques en anglais et en Chinois. Gravé à la maison Mo hai (1859).18 livres.

代疑篇Dai yi pian.

Questions sur la religion chrétienne.Par Yang Ting yun. Préface signée de Liang an zi. Dissertation générale par l'auteur, surnom Mi ke zi. Gravé à l'église Ling bao à Pékin.2 livres.Catalogus librorum 25 (Dai yi bian).

代疑續篇Dai yi xu pian.

Suite au Dai yi pian.Par Yang Ting yun Qi yuan. Préface par Wang Zheng (la même que celle du Chinois 7095) ; postface par Zhang Geng (1635). Gravé à l'église Jing jiao, à Jin jiang (1635).2 livres.

Dai yi xu pian.

Copie du précédent, sans préface ni postface.

Dai al PLEI. 'Dale al PLEI'.

Se facilita el enlace a un blog elaborado en el CEIP San Félix de Candás (Asturias) y fruto de la labor realizada por un grupo de trabajo integrado por dieciséis profesores del colegio, que trabajaron en el desarrollo del plan lector del centro. En este blog encontraremos: un vídeo sobre la importancia de las palabras; un poema con ilustraciones sobre la vida de Miguel Hernández; varios vídeos que presentan diversas actividades relacionadas con la animación a la lectura y su aplicación en el aula de inglés; una actividad realizada por un experto en literatura infantil que gira en torno a la lectura elegida en el aula; y finalmente, la presentación de un trabajo documental realizado en la mediateca del centro en torno al tema 'España y las Comunidades'.

El mètode DAI instrument d'avaluació i material curricular. 'El método DAI instrumento de evaluación y material curricular'.

Documento incluído en el volumen 'Experiències d'innovació educativa. Tractament de la diversitat'. Expone una visión general sobre el método DAI publicado en 1992, trabajo de investigación pedagógica catalana realizado en 1990 por J.M Ferran y J. Masip, a partir del esbozo de 1989. Recoge las conclusiones del seminario sobre 'elaboración de recursos y materiales para la integración', a partir de la propia experiencia de los aspectos organizativos y didácticos que favorecen el desarrollo de proyectos innovadores y de las estrategias que se pueden desarrollar para mejorar la calidad de enseñanza e innovar con los recursos de los que dispone el centro. Hace un breve resumen de las perspectivas de futuro y propone acciones formativas e innovadoras que permiten un mejor desarrollo de la implantación de la reforma con las implicaciones en la comunidad educativa y el contexto social.