Local matching indicators for transport with concave costs

In this note, we introduce a class of indicators that enable to compute efficiently optimal transport plans associated to arbitrary distributions of $N$ demands and $N$ supplies in $\mathbf{R}$ in the case where the cost function is concave. The computational cost of these indicators is small and independent of $N$. A hierarchical use of them enables to obtain an efficient algorithm

Drug Control in Public Schools

It is unlikely that a completely drug-free environment can be created in schools until solutions are found for the much more serious problems of alcohol and drug abuse in American society as a whole

Local matching indicators for transport problems with concave costs

In this paper, we introduce a class of indicators that enable to compute efficiently optimal transport plans associated to arbitrary distributions of N demands and M supplies in R in the case where the cost function is concave. The computational cost of these indicators is small and independent of N. A hierarchical use of them enables to obtain an efficient algorithm

NO2 jet cooled visible excitation spectrum - Vibronic chaos induced by the X2A1-A2B2 interaction

International audienceSignificant improvements have been obtained on measurements of the NO2 jet cooled excitation spectrum in the 16 300-18 502 cm-1 range, previously obtained by Smalley et al. [J. Chem. Phys. 63,4977 ( 1975), Persch et al. [ Ber. Bunsenges. Phys. Chem. 92,312 ( 1988), and Hiraoka et al. [J. Mol. Spectrosc. 126,427 ( 1987). The improvements concern first the rotational analysis, owing to a better resolution ( 150 MHz) and absolute precision ( 500 MHz), and second the completeness and purity of the resulting vibronic sequence, owing to a better sensitivity. As a result, 159 vibronic energy levels have been observed in the 16 500-18 500 cm-1 energy range, where 210 ± 10 are expected. A detailed comparison with previous results is presented. The statistical analysis of the corresponding energy spacings shows that long range correlations up to 50 mean levels spacings are present, confirming the chaotic behavior of this set of vibronic levels. Furthermore, we analyze the observed rovibronic interactions (or rotational perturbations) that are responsible for the very irregular rotational behavior of the visible absorption spectrum of NO2 at room temperature

Minimum-weight perfect matching for non-intrinsic distances on the line

Consider a real line equipped with a (not necessarily intrinsic) distance. We deal with the minimum-weight perfect matching problem for a complete graph whose points are located on the line and whose edges have weights equal to distances along the line. This problem is closely related to one-dimensional Monge-Kantorovich trasnport optimization. The main result of the present note is a "bottom-up" recursion relation for weights of partial minimum-weight matchings.Comment: 13 pages, figures in TiKZ, uses xcolor package; introduction and the concluding section have been expande

Effects of Reflective Learning Resource Material on Achievement of Mathematics Learning Outcome

This study developed and used a Reflective Learning Resource Material in Grade 9 Mathematics in effort to improve the performance learning outcome. It aimed to determine the effect of the developed learning resource material to the learning outcome in terms of analysis, representation and problem-solving skills. The study used descriptive research design utilizing the pretest/ posttest assessments and survey questionnaire as the main instruments, with 35 Grade 9 students during the school year 2020-2021 as participants of the study. The results revealed that reflective learning resource material is highly effective in the achievement of the Mathematics learning outcome. Further data resulted to a significant difference and an increased Mathematics learning outcome assessment on analysis, representation, and problem-solving skills implying that the use of reflective learning resource material helped the students improve their Mathematics skills. From lower proficiency levels, learners were able to reach advanced and proficient levels, indicating mastery of the competencies. This demonstrates the use of RLRM has a good significant relationship with mathematical skills development. The results suggest that incorporating reflective learning resource material into students’ learning activities can improve Mathematics learning outcome

Application of Task-Based Learning Module in Mathematics V

This study aimed to determine the effectiveness of the task-based learning module in Mathematics in improving the computational skills of Grade V Students. The study used descriptive-experimental research design focused on students’ perception of the lesson structure, evaluation of the module, and its effectiveness in improving the computational skills of the students. Generally, the students perceived the structure of the module in terms of pre-task, task, and review as very well structured. Likewise, the findings showed the evaluation in terms of adaptability, clarity, validity, usability, and aesthetic value to a very great extent. The results also showed a significant difference in the pre-test and post-test scores of the students in computational skills in terms of problem solving, decision making, sequencing, algorithm formation, and quantitative measurement. However, no significant relationship was found between the perceived structure of the lesson and the mean scores of the students in computational skills. Moreover, the perceived evaluation of the module has no significant relations with the computational skills. The study recommends the use of task-based learning module in Mathematics following the structure of pre-task, task, and review to improve the computational skills of the students

Multi-confocal fluorescence correlation spectroscopy in living cells using a complementary metal oxide semiconductor-single photon avalanche diode array

International audienceLiving cells are heterogeneous and rapidly changing biological samples. It is thus desirable to measure molecular concentration and dynamics in many locations at the same time. In this note, we present a multi-confocal setup capable of performing simultaneous fluorescence correlation spectroscopy measurements, by focusing the spots with a spatial light modulator and acquiring data with a monolithic 32 × 32 single-photon avalanche photodiode array. A post-processing method is proposed to correct cross-talk effects between neighboring spots. We demonstrate the applicability of our system by simultaneously measuring the diffusion of free enhanced Green Fluorescent Protein (eGFP) molecules at nine different points in living cells

Dry deposition of nitrogen compounds (NO 2 , HNO 3 , NH 3 ), sulfur dioxide and ozone in west and central African ecosystems using the inferential method

Abstract. This work is part of the IDAF program (IGAC-DEBITS-AFRICA) and is based on the long-term monitoring of gas concentrations (1998–2007) established at seven remote sites representative of major African ecosystems. Dry deposition fluxes were estimated by the inferential method using on the one hand surface measurements of gas concentrations (NO2, HNO3, NH3, SO2 and O3) and on the other hand modeled exchange rates. Dry deposition velocities (Vd) were calculated using the big-leaf model of Zhang et al. (2003b). The bidirectional approach is used for NH3 surface–atmosphere exchange (Zhang et al., 2010). Surface and meteorological conditions specific to IDAF sites have been used in the models of deposition. The seasonal and annual mean variations of gaseous dry deposition fluxes (NO2, HNO3, NH3, O3 and SO2) are analyzed. Along the latitudinal transect of ecosystems, the annual mean dry deposition fluxes of nitrogen compounds range from −0.4 to −0.8 kg N ha−1 yr−1 for NO2, from −0.7 to −1.0 kg N ha−1 yr−1 for HNO3 and from −0.7 to −8.3 kg N ha−1 yr−1 for NH3 over the study period (1998–2007). The total nitrogen dry deposition flux (NO2+HNO3+NH3) is more important in forests (−10 kg N ha−1 yr−1) than in wet and dry savannas (−1.6 to −3.9 kg N ha−1 yr−1). The annual mean dry deposition fluxes of ozone range between −11 and −19 kg ha−1 yr−1 in dry and wet savannas, and −11 and −13 kg ha−1 yr−1 in forests. Lowest O3 dry deposition fluxes in forests are correlated to low measured O3 concentrations, lower by a factor of 2–3, compared to other ecosystems. Along the ecosystem transect, the annual mean of SO2 dry deposition fluxes presents low values and a small variability (−0.5 to −1 kg S ha−1 yr−1). No specific trend in the interannual variability of these gaseous dry deposition fluxes is observed over the study period