Pelaksanaan Supervisi Akademik Pengawas Sekolah sebagai Upaya Peningkatan Profesionalisme Guru

Academic supervision is an activity planned to help teachers in the learning process in order to improve students' learning outcomes. This study aimed at investigating the supervision of school's supervisor in improving the professionalism of teachers and improve the quality of education at SMP Negeri 44 Palembang. The type of this research is qualitative and the data were obtained by observation, documentation and interview. The results of this study (1) supervision conducted by applying the official approach, partners, and kinship, and the techniques developed by supervisors in implementing academic supervision vary considerably; (2) supervisory obstacles in carrying out academic supervision is the number of teachers were too many, however it only had limited time; (3) the implementation of general academic supervision is good enough and able to carry out its duties and functions properly; (4) aspects that have been targeted by the supervision of school's supervisors are still limited, not all aspects of academic supervision; (5) the frequency of visits by school's supervisors in conducting academic supervision is considered lack because it is not evenly distributed; teachers receive class visits by supervisors; and (6) efforts made by supervisors in carrying out academic supervision at SMP Negeri 44 Palembang have not been optimal in providing guidance to teachers

Progress towards Bell-type polarization experiment with thermal neutrons

Experimental tests of Bell-type inequalities distinguishing between quantum mechanics and local realistic theories remain of considerable interest if performed on massive particles, for which no conclusive result has yet been obtained. Only two-particle experiments may specifically test the concept of spatial nonlocality in quantum theory, whereas single-particle experiments may generally test the concept of quantum noncontextuality. Here we have performed the first Bell-type experiment with a beam of thermal-neutron pairs in the singlet state of spin, as originally suggested by J. S. Bell. These measurements confirm the quantum-theoretical predictions, in agreement with the results of the well-known polarization experiments carried out on optical photons years ago

Mise au point d’une méthodologie d’étalonnage d’une presse destinée à la fabrication des blocs de terre comprimée

Les paramètres utilisés pour la description des sols entrant dans la fabrication des blocs de terre comprimée sont proposés. La notion de fonction caractéristique d’une presse pour blocs de terre comprimée afin de décrire leur état de fonctionnement est introduite et ses propriétés données. Les effets de certains paramètres sur l’aptitude au compactage des sols sont examinés et les critères utilisables pour la sélection des matières premières pour blocs de terre comprimée sont présentés. Mais les presses à blocs de fabrication camerounaise, ne sont pas utilisées dans des très bonnes conditions ; du fait de l’absence de fiche technique. Pour lever cette lacune, une méthodologie d’étalonnage est proposée et appliquée à une presse de fabrication locale de type Cinva–Ram. Les résultats obtenus indiquent que : pour le sol de référence utilisé, la teneur en eau et la masse totale humide optimales sont de 18,64% et 1,900kg.Mots-clés : blocs de terre, étalonnage, fonction caractéristique, résistance.Development of a methodology for the calibration of compressed earth’s blocks pressIn this article, the parameters used to describe the soils used in the manufacturing of compressed earth blocks are presented. The notion of characteristic function of the compressed earth blocks machines is used to describe their state of functioning and its properties are given. The effects of some parameters, on the capacity of soils to be compacted are examined and the criteria used to select them as raw material for compressed earth blocks are presented. But in Cameroon, earth block machines are not well used because of the lack of technical data on them. In order to reduce this shortcoming, a calibration methodology is proposed and applied to a local Cinva-Ram blocks press. The results obtained indicate that: for the reference soil used, the optimal moisture content and the optimal wet mass are 18.64% and 1.900kg.Keywords : earth block, calibration, characteristic function, resistance

L'activité de butinage des Apoides sauvages (Hymenoptera Apoidea) sur les fleurs de maïs à Yaounde (Cameroon) et réflexions sur la pollinisation des graminées tropicales

The gatering activity of wild bees (Hymenoptera Apoidea) on flowers of maize at Yaound (Cameroon) and further considerations on pollination of the tropical Gramineae. At Nkolbisson (Yaounde, Cameroon), in May 1991, flowers of maize (Zea mays L; Poaceae) were observed for the study of pollen gathering by five different species of wild bees: one Apidae Meliponinae (Dactylurina staudingeri) and four Halictidae Nomiinae (Lipotriches andrei, Lipotriches langi, Lipotriches notabilis and Leuconomia granulata). Each of these Apoidea is well attracted by pollen of maize. The larger number of bees foraging at the same time on a panicle varies from one with Dactylurina staudingeri to four with Lipotriches andrei and Lipotriches notabilis. Generally, bees forage maize during the whole day and during the full flowering period but visits are more numerous in the morning and during the period of intense flowering. Median duration of a visit on a male spikelet varies from 1 sec with Dactylurina staudingeri to 7 sec with Lipotriches andrei. These Apoidea have an elaborated behaviour when gathering pollen of maize. Dactylurina staudingeri however seems less adapted to the floral morphology of Poaceae comparing with Lipotriches. When foraging maize, all these bees are regular visitors to flowers of this plant, even in the presence of other flower species in the vicinity of the crop. Bees studied have a positive impact on the yield of grains due to a complementary action with the well known one of the wind. The influence is indirect as the bees are seldom visiting the stigmates. The explanation is that when the bees are very common on the panicles they shake the anthers, inducing the release of pollen grains in the atmosphere even in the days without wind. The part of wild bees in the increase of yields is estimated to 3/ while the one of the domestic bees (Apis mellifera) is estimated to 21/ in that locality. The authors are reviewing existing literature on grass crop pollination and on Poaceae in general by various species of bees. For a better integrated crop management of maize in Cameroon, it is suggested to conserve the nesting sites of Lipotriches in surrounding areas of crops and to avoid unjustified use of pesticides during the flowering period

Further evidence of antibunching of two coherent beams of fermions

We describe an experiment confirming the evidence of the antibunching effect on a beam of non interacting thermal neutrons. The comparison between the results recorded with a high energy-resolution source of neutrons and those recorded with a broad energy-resolution source enables us to clarify the role played by the beam coherence in the occurrence of the antibunching effect.Comment: 4 pages, 3 figure

First results from an aging test of a prototype RPC for the LHCb Muon System

Recent results of an aging test performed at the CERN Gamma Irradiation Facility on a single--gap RPC prototype developed for the LHCb Muon System are presented. The results are based on an accumulated charge of about 0.45 C/cm$^2$, corresponding to about 4 years of LHCb running at the highest background rate. The performance of the chamber has been studied under several photon flux values exploiting a muon beam. A degradation of the rate capability above 1 kHz/cm$^2$ is observed, which can be correlated to a sizeable increase of resistivity of the chamber plates. An increase of the chamber dark current is also observed. The chamber performance is found to fulfill the LHCb operation requirements.Comment: 6 pages, 9 figures, presented at the International Workshop on Aging Phenomena in Gaseous Detectors'', DESY-Hamburg (Germany), October 200

Inhibition of Multidrug-Resistant Gram-Positive and Gram-Negative Bacteria by a Photoactivated Porphyrin

The authors studied the in vitro antibacterial activity of the photo-activated porphyrin meso-tri(N-methyl-pyridyl), mono(N-tetradecyl-pyridyl)porphine (C14) against four multidrug-resistant bacteria: Staphylococcus aureus, Enterococcus faecalis (Gram-positive), Escherichia coli, Pseudomonas aeruginosa (Gram-negative). Using 10 g/ml of porphyrin and 60 sec irradiation we observed the remarkable susceptibility of S. aureus and E. faecalis to treatment while, under the same conditions, E. coli and P. aeruginosa showed very low susceptibility. In a later stage, suspensions of Gram-negative bacteria were processed with EDTA before photo-activation, obtaining a significant decrease in viable counts. In view of the results, if the combination of low porphyrin concentrations and short irradiation times will be effective in vivo also, this approach could be a possible alternative to antibiotics, in particular against localized infections due to multidrug-resistant microorganisms

Preliminary results of an aging test of RPC chambers for the LHCb Muon System

The preliminary results of an aging test performed at the CERN Gamma Irradiation Facility on a single--gap RPC prototype developed for the LHCb Muon System are presented. The results are based on an accumulated charge density of 0.42 C/cm^2, corresponding to about 4 years of LHCb running at the highest background rate. We observe a rise in the dark current and noise measured with source off. The current drawn with source on steadily decreased, possibly indicating an increase of resistivity of the chamber plates. The performance of the chamber, studied with a muon beam under several photon flux values, is found to still fulfill the LHCb operation requirements.Comment: 4 pages, 6 figures, presented at RPC2001, VIth Workshop on Resistive Plate Chambers and Related Detectors, November 26-27 2001, Coimbra, Portuga

Development of a Digital Twin Model for Real-Time Assessment of Collisione Hazards

The AEC industry is nowadays one of the most hazardous industries in the world. The construction sector employees about 7% of the world’s work force but is responsible for 30-40% of fatalities. As statistics demonstrate, interferences between workers-on-foot and moving vehicles have caused several injuries and fatalities over the years. Despite safety organizational measures, passive safety devices imposed by regulations and efforts from training procedures, scarce improvements have been recorded. Recent research studies propose technology driven approaches as the key solutions to integrate standard health and safety management practices. This is motivated by the evidence that the dynamics of complex systems can hardly be predicted; rather a proactive approach to health and safety is more effective. Current technologies installed on construction equipment can usually react according to a strict logic, such as sending proximity alerts when workers and equipment are too close. Nevertheless, these approaches barely do make informed decisions in real-time, e.g. including the level of reactiveness of the endangered worker. In similar circumstances a digital twin of the construction site, updated by real-time data from sensors and enriched by artificial intelligence, can pro-actively support activities, forecasting dangerous scenarios on the base of several factors. In this paper a laboratory mock-up has been assumed as the test case, supported by a game engine, which is able to replicates the job site for the execution of bored piles. In such a scenario populated by an avatar of a sensor-equipped worker and a virtual driller, a Bayesian network, implemented within the game engine and fed in runtime by sensor data, works out collision probability in real-time in order to send warnings and avoid fatal accidents