12 research outputs found
Characterization of the Sludge of Batna (Algeria) Waste Water Treatment Plant for Its Valorization
No full textCHARACTERIZATION AND THERMAL STUDY OF SEWAGE SLUDGE FROM THE MUNICIPAL WASTEWATER TREATMENT PLANT OF EL EULMA, ALGERIA
No full textThe continuous produce of sewage sludge generated by the treatment of wastewater in wastewater treatment plants poses a serious environmental problem. The characterization of sewage sludge before its reuse in safe way becomes very important. The aim of this study is the characterization of sludge and calcined sludge in different temperatures in the range of 200 °C - 1100 °C. Qualitative and quantitative analysis were achieved using X-ray diffraction (XRD) and X-ray fluorescence (XRF). Thermal behavior of sludge was studied using thermo gravimetric analysis (TGA), differential thermal analysis (DTA) and differential scanning calorimetry (DSC). Loss in mass, carbonates rate, pH, chemical oxygen demand (COD) and nitrate contents are also measured. Results show that major mineral constituents in our sludge and calcined sludge are, Al2O3, SiO2, CaCO3 and Fe2O3. Thermal behavior of sludge indicates three important losses in mass, first with a value of 8.24 % in temperature lower than 250 °C, the second with a value of 43.79 % between 230 °C and 700 °C and above 700 °C until 1100 °C a loss of 13.77 %. pH measurements values of different calcined samples are in the range from
6.3 to 11.1. Measurement of COD and nitrates contents reveals the values
2474 mg·L-1 and 134 mg·L-1 respectively
Diaquabis[5-(2-pyrazin-2-yl)tetrazolato]copper(II)–pyrazine-2-carbonitrile (1/2)
No full textThe title compound, [Cu(C5H3N6)2(H2O)2]·2C5H3N3, is a 1:2 co-crystal between the mononuclear complex diaquabis[5-(pyrazin-2-yl)tetrazolato]copper(II) and the reagent pyrazine-2-carbonitrile which was used in the synthesis. The CuII atom is located on an inversion centre and has a distorted octahedral [4 + 2]-coordination environment formed by four N atoms of two chelating bidentate 5-(pyrazin-2-yl)tetrazolate ligands at shorter distances and two water O atoms at longer distances. The CuII complex molecules are held together by O—H...N hydrogen bonds and π–π stacking interactions [centroid–centroid distance 3.6139 (8) Å], forming layers parallel to (100). These layers alternate with layers of pyrazine-2-carbonitrile molecules and both are held together via C—H...N hydrogen bonds and further π–π stacking interactions
Bibliometric Analysis and Systematic Literature Review in Management Practices & Artificial Intelligence
No full textArtificial Intelligence (AI) has emerged as a transformative technology to reshape different practices of management, such as decision-making processes, organizational performance, and human interactions in business settings. The purpose of this study is to map out the intersection between Artificial Intelligence and Management practices. Several studies of relevant scholarly articles have been carried out to identify the interaction of AI on the three main Management practices through a comprehensive review analysis using Scopus database. This bibliometric study offers insights into scientific trends, author patterns and thematic field advancement. In addition to pointing out the gaps in the literature and suggesting directions for future research such as the ethical issues surrounding the use of AI. The results of the systematic literature review are eventually mapped out on VOSviewer and presented by visualization techniques demonstrating key research clusters. This study is subject to limitations as it solely depends on the Scopus database. Future studies could grant from merging additional sources like PubMed, Crossref, among others
North African Mosaic: A Cultural Reappraisal of Ethnic and Religious Minorities
No full textDavid Crawford is a contributing author, Making Imazighen: Rural Berber Women, Household Organization, and the Production of Free Men , pp 329-346.
Book description: This book’s ambition is to offer the most recent scholarship on North African cultures at a time when the very notion of culture is being re-evaluated in the shifting tides that both associate and divorce the forces of nationalism, globalism and neo-liberalism. Another ambition is to be a readable document about the past and the potential of North African civilizations. Those which have been crystallized into a polysemic voice from centuries of occupations, exchanges and what is now commonly called hybridizations. In this work the collective position of the authors, with their different fields of experience, is that the languages, musics, and the many expressions of common life in North Africa continue to flourish. That they are a bridge between sub-Saharan peoples and Europe. That they are a necessary antidote to the anemic political discourses that have prevailed since decolonization. That they are seminal for the future of the African continent as it begins its true voyage into democracy. It is difficult, at this juncture, to measure the distance that, in the decades to come, will be achieved on that voyage. It is, however, less difficult to evaluate the importance of North Africa on tomorrow’s world. If the past is an indicator, it will be an important force in the cross-flow of trade, ideas and of global destinies.https://digitalcommons.fairfield.edu/sociologyandanthropology-books/1005/thumbnail.jp
Remote blue whale call detection using a passive version of the stochastic matched filter paper
No full textInternational audienceis an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. This is an author-deposited version published in: https://sam.ensam.eu Handle IDMore than 30 years after the institution of the moratorium on commercial whaling by the International Whaling Commission, one of the biggest challenges in whale monitoring, e.g. Antarctic Blue Whales (ABW), is assessing populations to evaluate their recovery from persecution by mankind. To do this, passive acoustic monitoring is widely used all around the globe focusing on call detection of vocalizing whales. It has been demonstrated that ultra low frequency Ocean Bottom Seismometer hydrophones (OBSh) provide high quality data for whale monitoring, especially because of their large covering areas. Due to high energy seismic noise, previously developed autonomous methods based on signal cross-correlation are not suitable for this kind of approach. As a first step to ABW monitoring, a new method is used, based on a passive application of the Stochastic Matched Filter (SMF). This is an extension of the matched filter for degraded signals in colored noise. The SMF has been adjusted to perform ABW Z-call detection in noisy environments (seismic broadband noise, boat direct tonal spectrum, other whale calls…).In addition, its properties allow degraded calls (frequency dependent attenuation, multipath distortion) to be detected, covering large ranges. This new method is applied on a representative dataset -in terms of noise environment and signal variety- recorded by an OBSh in the [0-50]Hz frequency band, deployed at 4000 m depth on a mid-ocean ridge in the South West Indian ocean (RHUM-RUM project). The SMF’s robustness against noise is compared to the classical Matched Filter: the output’s SNR is maximized and the false alarm drastically decreases. It can then be arranged to provide call time of arrival as an input to a localization algorithm, even for remote calls
(E)-1-[(2,4,6-Tribromophenyl)diazenyl]naphthalen-2-ol
No full textThe title azo molecule, C16H9Br3N2O, adopts a trans conformation with respect to the azo N=N double bond. An intramolecular O—H...N hydrogen bond forms an S(6) ring motif. The dihedral angle between the naphthalene ring system and the benzene ring is 33.80 (16)°. In the crystal, molecules are stacked in columns along the a axis by π–π interactions [centroid–centroid distances = 3.815 (3) and 3.990 (3) Å]
1-[(E)-2-(2-Hydroxy-5-methylphenyl)diazen-2-ium-1-yl]naphthalen-2-olate
No full textThe title zwitterion, C17H14N2O2, crystallizes with two independent molecules in the asymmetric unit, both of which are approximately planar, the dihedral angles between the benzene ring and the naphthalene ring system being 4.39 (12)° in one molecule and 5.83 (12)° in the other, and show an E conformation with respect to the azo double bond. An intramolecular N—H...O hydrogen bond in each molecule helps to establish their near planar conformation. In the crystal, molecules are linked through O—H...O hydrogen bonds into infinite chains running along the a-axis direction. In addition, the chains are stacked along the b axis via π–π interactions between the benzene and the naphthalene rings of adjacent molecules, the centroid–centroid distances being 3.722 (3) and 3.823 (4) Å
(E)-1-(2-Phenyldiazen-2-ium-1-yl)naphthalen-2-olate
No full textIn the title zwitterionic compound, C16H12N2O, the dihedral angle between the phenyl ring and the naphthalene ring system is 17.85 (8)°; an intramolecular N—H...O hydrogen bond occurs. In the crystal, π–π stacking is observed between naphthalene ring systems of adjacent molecules, the centroid–centroid distance being 3.6486 (11) Å
Bifidobacteria on the spot: a genomics approach on population dynamaics and interactions in the intestinal tract
No full textThis thesis combines comprehensive microarray-based studies contributing to a better understanding of the role of bifidobacteria in relation to the human host. It reviews recently described modes of interaction between bifidobacteria and human gastrointestinal cells and highlights the unique characteristics of the genus Bifidobacterium that are indicative for its role in our gut. A microarray platform has been developed that enables genomic comparison of Bifidobacterium species originating from our gastrointestinal tract (GIT). Based on the obtained high-resolution data, species-unique genomic sequences could be identified. A large fraction of these predicted genes encode proteins belonging to the bifidobacterial glycobiome. An unique ability of the microarray platform is to zoom in on the strain level. Direct mapping of genomic hybridization patterns was applied on different B. breve isolates. This revealed a relatively high genomic variation, testifying for the existence of various subspecies within the species B. breve. Clustering of the same hybridization patterns resulted in clear grouping of isolates originating from the same infant, indicating specific niche adaption. Additionally, DNA extracts from Bifidobacterium populations from different infant fecal samples were analyzed. This enabled the analysis of the bifidobacterial population dynamics in breast- and formula-fed infants. The applied microarray platform showed the potential to monitor temporal development and effects of dietary regimens. The observed differences in the composition of bifidobacterial populations could be linked to dietary effects. Additionally, mapping of hybridization patterns enabled monitoring shifts in genomic content within one bifidobacterial species in time. Sequence analysis of DNA fragments showing discriminating hybridization characteristics, resulted in the selection of genes that are either conserved or strain-specific within the species B. breve. Next to studying genomic variation, transcript profiling experiments in both bifidobacterial cells and human intestinal epithelial cell lines were performed. Analysis of bifidobacterial transcriptional responses provided clear proof of transcriptional activity in bifidobacterial cells isolated from infant feces. To the best of our knowledge, this is the first demonstration of in situ activity of bifidobacteria in the human GIT. Furthermore, our results indicate a link between transcription patterns and the infants’ diet, as bifidobacteria in fecal samples from breast-fed infants showed differential transcriptional responses in comparison to those in fecal samples from formula-fed infants. Additionally, transcript sequence analysis revealed expression of genes that are homologous to genes known to be involved in folate production, testifying for the production of this important vitamin in early life. Finally, transcriptome analysis on human intestinal epithelial cells (HIECs) showed species-specific suppression by B. breve M-16V of genes upregulated by TNF-α. Other B. breve strains showed an extreme mild or no effect on TNF-α stimulation. Although we did not observe complete suppression of the TNF effect, we could show that apoptotic and immune regulatory pathways were affected by incubation with cells of B. breve M-16V. In conclusion, the work presented in the thesis, which formed part of a larger IOP Genomics project, contributed to an advanced insight in the interaction between bifidobacteria and the human host. Furthermore, it resulted in the development of genome-based molecular platforms suited for analyzing genomic diversity between and within species, as well as population dynamics in complex microbial communities. We anticipate that the molecular approaches pioneered in this thesis will be instrumental in the further elucidation of the host-microbe interactions in the GIT of human an other animals. <br/
