Contributions of the seasonal and long term flood patterns of River Niger to the development and control of water hyacinth (Eichhornia crassipes) in Kainji Lake, Nigeria

(6 page document

Protocorks and monopole Floer homology

We introduce and study a class of compact 4-manifolds with boundary that we call protocorks. Any exotic pair of simply connected closed 4-manifolds is related by a protocork twist, moreover, any cork is supported by a protocork. We prove a theorem on the relative Seiberg-Witten invariants of a protocork before and after twisting and a splitting theorem on the Floer homology of protocork boundaries. As a corollary we improve a theorem by Morgan and Szab\'{o} regarding the variation of Seiberg-Witten invariants with an upper bound which depends only on the topology of the data. Moreover we show that for any cork, only the reduced Floer homology of its boundary contributes to the variation of the Seiberg-Witten invariants after a cork twist.Comment: Improved exposition of protocork twist operation, added paragraph on Morgan-Szab\'{o} number, minor modification

Molecular and enological characterization of autochthonous <i>Saccharomyces cerevisiae</i> strains isolated from grape-musts and wines Cannonau

Fermentation by autochthonous yeasts may produce wines with enological properties that are unique of a specific area or variety of grape must. In order to identify yeast starter strains for the production of the Sardinian wine Cannonau DOC, 66 Saccharomyces cerevisiae strains, isolated from musts and wines Cannonau of six vitivinicole areas in Sardinia, were subjected to enological characterization and molecular identification. The RFLP-PCR fingerprinting of the ITS region of rRNA (ITS1-5,8S- ITS2) as well as ethanol, foam, and H2S production were analysed

Total Factor Productivity Growth and Employment: A Simultaneous Equations Model Estimate

This paper provides a structural estimation of the recent model proposed by Pissarides and Vallanti, a simplified equilibrium model which draws heavily on models with frictions and quasi-rents. The structural model is a system of three equations. The estimation method is a three-stage least squares. My empirical results find that although faster TFP growth temporarily decreases employment, most likely be- cause job destruction reacts faster to schocks than job creation does, after the first year I do not find any statistically significant effect of growth on employment

Bridging the Gaps for a ‘Circular’ Bioeconomy: Selection Criteria, Bio-Based Value Chain and Stakeholder Mapping

Bio-products and bio-based value chains have been identified as one of the most promising pathways to attaining a resource-efficient circular economy. Such a “valorization and value-addition” approach incorporates an intricate network of processes and actors, contributing to socio-economic growth, environmental benefits and technological advances. In the present age of limited time and funding models to achieve ambitious sustainable development targets, whilst mitigating climate change, a systematic approach employing two-tier multi-criteria decision analysis (MCDA) can be useful in supporting the identification of promising bio-based value chains, that are significant to the EU plans for the bio-economy. Their identification is followed by an elaborate mapping of their value chains to visualize/foresee the strengths, weaknesses, opportunities and challenges attributable to those bio-based value chains. To demonstrate this methodology, a systematic review of 12 bio-based value chains, prevalent in the EU, sourcing their starting material from biomass and bio-waste, has been undertaken. The selected value chains are mapped to visualize the linkages and interactions between the different stages, chain actors, employed conversion routes, product application and existing/potential end-of-life options. This approach will help chain-actors, particularly investors and policy-makers, understand the complexities of such multi-actor systems and make informed decisions

Marketing and distribution of fish from Lake Chad

This study provides information on fish quantities, economic data and flows of Doro fish market near Baga, Nigeria, known as the major fish market on the Nigeria section of the Lake Cha

ICCSA 2022

Producción CientíficaThe process of economic, social, and cultural development leads to relevant changes in urban areas. Urban transformations usually generate a series of public and private real estate compounds which constitute real obstacles to urban walkability. The growing attention towards the sustainable development goals established on a global scale introduced new contents in urban redevelopment policies, aimed at favoring higher levels of accessibility in the consolidated fabric, particularly that of the pedestrian type. In addition, the recent pandemic has recently reassessed the role of pedestrian mobility as a primary way of moving instead of using other means of transport. As a result, urban walkability has moved at the core of the sustainable city paradigm. More precisely, issues related to accessibility and walkability should be considered when addressing the obstacle generated by those sites that can be properly defined ‘urban enclaves’, especially when abandoned or under redevelopment. These conditions may encourage the gradual reopening of these areas for citizens. Within this framework, the Sustainable Urban Mobility Plan (SUMP) can represent a strategic tool for identifying the critical aspects to face for the creation of a new network of pedestrian routes aimed at improving urban walkability. The objective of this study is to define a set of principles and criteria, both tangible and intangible, for calculating the proximity index (PI). The PI may consequently drive urban regeneration projects also through the design of new paths for crossing the enclaves to improve urban permeability and, therefore, the level of walkabilitySardinia Foundation (CUP F74I19001040007

Comparison of Fertiliztion, Hatchability, Growth and Survival of Clarias Gariepinus from Adamawa and Katsina States

Studies of intra – specific hybridization between Clarias gariepinus from two ecological zones namely Adamawa and Katsina states in North west and North eastern Nigeria, was carried out at fisheries departmental farm of Modibbo Adama University Yola for the period of 3 weeks, to determine the percentage fertilization, hatchability, survival rate and growth performance of hatchlings from the different crosses. Four intra – specific progenies were obtained from the crosses of the two strains of C. gariepinus. Hatchlings were fed with Artemia free cyst and   Coppens for the 3 weeks. The results showed that purebred from Katsina had better fecundity (240,800 eggs) than Yola (125,625    eggs). There was a significant difference (p 0.05) in the weight of right and left lobes of testes (4.5g and 2.7g) and in the length of the right and left lobes of the broodstock from the different strains. KT x KT had the highest percentage fertility (97.7%) followed by YY x YY (97.2%), ♀YY X ♂KT (96%) and the least in ♀KT x ♂YY (93.6%). KT x KT had the highest percentage hatchability (97.3%) followed by ♀YY x ♂KT (96%), ♀KT x ♀YY (95%) and the least was YY x YY (87%). There was a significant difference (p 0.05%) in the fertility and hatchability between purebreds and hybrids. At the end of 3 weeks survival rate was higher in YY x YY (95%) followed by KT x KT (90%), ♀YY x ♂KT (80%) and ♀KT x ♂YY (75%). Keywords: Strain, Fertilization, Hatchability and survival, Clarias gariepinu