scholarly journals Performance de l’association mixte sorgho-niébé sur les productivités du sorgho et des sols en zone Soudano-Sahélienne du Burkina Faso

2021 ◽  
Vol 15 (3) ◽  
pp. 987-1005
Author(s):  
Koulibi Fidèle Zongo ◽  
Edmond Hien ◽  
Boussa Tockville Mare ◽  
Daouda Guebre
Keyword(s):  
Burkina Faso ◽  
High Efficiency ◽  
Cropping System ◽  
Northern Region ◽  
Organic Substrate ◽  
Organic Substrates ◽  
Mixed Cropping ◽  
Significant Performance ◽  
The Many ◽  
Sahelian Zone

Dans la zone soudano-sahélienne du Burkina Faso, la performance des associations mixtes sorgho-niébé reste faible bien que les nombreux services écosystémiques rendus par les associations céréales-légumineuses soient connus. L’objectif de la présente étude a été de comprendre la performance des associations mixtes sorgho-niébé sur la productivité du sorgho et du sol. L’étude a consisté à conduire des tests multi-locaux avec de petits agriculteurs familiaux de la région Nord du Burkina Faso. Des traitements à base de zaï simple (ZS), zaï + 9 t ha-1 de substrats organiques (ZF) et zaï + 9 t ha-1 de substrats organiques + 50 kg ha-1 d’urée (ZFN) ont été testés en 2013, chaque traitement étant répété 9 fois. En 2014, le traitement ZFN a été remplacé par le traitement zaï + 9 t ha-1 de substrat organique + 600 kg ha-1 de Burkina Phosphate (ZFP). Chaque parcelle élémentaire a abrité l’association mixte sorgho-niébé et la monoculture du sorgho. Les résultats ont montré que l’association mixte sorgho-niébé a généralement entrainé une dépréciation des rendements du sorgho par rapport à la monoculture du sorgho. Par contre, une performance significative de +58% en 2014 et un accroissement de +10% en 2013 des rendements totaux grains de sorgho et de niébé ont été enregistrés par rapport à la monoculture du sorgho. Une grande efficacité d’acquisition des nutriments par le sorgho associé au niébé a été enregistrée en comparaison à la monoculture du sorgho. Pour une meilleure performance des cultures mixtes sorgho-niébé, les traitements ZS et ZF sont à recommander pour augmenter les rendements totaux grains de niébé et de sorgho ainsi que l’acquisition de N dans les grains du sorgho ; les traitements ZFN et ZFP sont, quant à eux, sont à recommander pour améliorer la fertilité résiduelle en N et P des sols dans la région Nord du Burkina Faso. English title: Performance of sorghum-cowpea mixed cropping system on sorghum and soils productivities in the Sudano-Sahelian zone of Burkina Faso In Sudano-Sahelian zone of Burkina Faso, the performance of sorghum and cowpea mixed cropping system remains low although the many ecosystems provided associated by cereal and legume mixed or intercropping system are known. The objective of this study was to understand the performance of these sorghum and cowpea mixed cropping system on the productivities of sorghum and soils. The study consisted to multi-local tests with small family farmers in the northern region of Burkina Faso. Treatments based on simple zaï (ZS), zaï + 9 t ha-1 of organic substrates (ZF) and zaï + 9 t ha-1 of organic substrates + 50 kg ha-1 of urea (ZFN) were tested in 2013, each treatment being replicated at 9 times. In 2014, the ZFN treatment was replaced by the zaï + 9 t ha-1 of organic substrate + 600 kg ha-1 of Burkina Phosphate (ZFP). Each elementary plot was occupied by sorghum and cowpea mixed cropping system and monocropping sorghum. The results showed that the yields of sorghum mixed by cowpea generally lowered than the yields of monocropping sorghum. In contrast, a significant performance of +58% in 2014 and an increase of +10% in 2013 on total sorghum and cowpea grains yields were recorded compared to monocropping sorghum. The high efficiency of nutrient acquisition by sorghum in mixed cropping system with cowpea was recorded compared to monocropping sorghum. For better performance of sorghum and cowpea mixed cropping system, ZS and ZF treatments are recommended to increase total sorghum and cowpea grains yields, the N acquisition in sorghum grains, and ZFN and ZFP treatments were suggested to improve residual N and P fertility of soils in the northern region Burkina Faso.

Dynamics of phosphorus and organic substrates in anaerobic and aerobic phases of a sequencing batch reactor

1994 ◽  
Vol 30 (6) ◽  
pp. 237-246 ◽  
Author(s):  
A. Carucci ◽  
M. Majone ◽  
R. Ramadori ◽  
S. Rossetti
Keyword(s):  
Sequencing Batch Reactor ◽  
Municipal Wastewater ◽  
Batch Reactor ◽  
General Assumption ◽  
Organic Substrate ◽  
Operating Conditions ◽  
Phosphate Removal ◽  
Substrate Uptake ◽  
Organic Substrates ◽  
Polyphosphate Metabolism

This paper describes a lab-scale experimentation carried out to study enhanced biological phosphate removal (EBPR) in a sequencing batch reactor (SBR). The synthetic feed used was based on peptone and glucose as organic substrate to simulate the readily biodegradable fraction of a municipal wastewater (Wentzel et al., 1991). The experimental work was divided into two runs, each characterized by different operating conditions. The phosphorus removal efficiency was considerably higher in the absence of competition for organic substrate between P-accumulating and denitrifying bacteria. The activated sludge consisted mainly of peculiar microorganisms recently described by Cech and Hartman (1990) and called “G bacteria”. The results obtained seem to be inconsistent with the general assumption that the G bacteria are characterized by anaerobic substrate uptake not connected with any polyphosphate metabolism. Supplementary anaerobic batch tests utilizing glucose, peptone and acetate as organic substrates show that the role of acetate in the biochemical mechanisms promoting EBPR may not be so essential as it has been assumed till now.

Studying National Commemoration and Political Celebrations in Africa: The Online Archive African Independence Days

2020 ◽  
Vol 2019 ◽  
pp. vii-xxviii
Author(s):  
Marie-Christin Gabriel ◽  
Carola Lentz
Keyword(s):  
Burkina Faso ◽  
Comparative Research ◽  
Democratic Republic ◽  
Nation Building ◽  
African Countries ◽  
Research Project ◽  
Online Archive ◽  
Republic Of The Congo ◽  
History Of ◽  
The Many

AbstractThe Department of Anthropology and African Studies (ifeas) at Johannes Gutenberg University Mainz hosts a comprehensive archive on African Independence Day celebrations. Created in 2010, the archive is one of the outcomes of a large comparative research project on African national days directed by Carola Lentz. It offers unique insights into practices of as well as debates on national commemoration and political celebrations in Africa. The archive holds more than 28,000 images, including photographs, newspaper articles, documents, and objects from twelve African countries: Benin, Burkina Faso, Cameroon, Côte d'Ivoire, Democratic Republic of the Congo, Gabon, Ghana, Madagascar, Mali, Namibia, Nigeria, and Tanzania. It primarily consists of an online photo and newspaper archive (https://bildarchiv.uni-mainz.de/AUJ/; https://www.blogs.uni-mainz.de/fb07-ifeas-eng/departmental-archives/online-archive-african-independence-days/); some of the material is also stored in the physical archive on African Independence Days at ifeas as well as in the department's ethnographic collection (https://www.blogs.uni-mainz.de/fb07-ifeas-eng/ethnographic-collection/). Most of the material concerns recent celebrations, but the collection has been complemented by some documentation of earlier festivities. Archives hold many stories while they also have a story to tell in their own right. This article discusses both aspects. It first traces the history of the Online Archive African Independence Days at ifeas. It then provides an overview of the different categories of material stored in the archive and tells a few of the many stories that the photos, texts and objects contain. We hope to demonstrate that the archive holds a wealth of sources that can be mined for studies on national commemoration and political celebrations in Africa, and, more generally, on practices and processes of nation-building and state-making.

scholarly journals Deriving the skyrmion Hall angle from skyrmion lattice dynamics

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
R. Brearton ◽  
L. A. Turnbull ◽  
J. A. T. Verezhak ◽  
G. Balakrishnan ◽  
P. D. Hatton ◽  
...  
Keyword(s):  
High Efficiency ◽  
Magnetic Field Gradient ◽  
Real Space ◽  
Magnetic Multilayer ◽  
Multilayer Systems ◽  
Space Technique ◽  
Hall Angle ◽  
Lattice State ◽  
The Many ◽  
Magnetic Skyrmions

AbstractMagnetic skyrmions are topologically non-trivial, swirling magnetization textures that form lattices in helimagnetic materials. These magnetic nanoparticles show promise as high efficiency next-generation information carriers, with dynamics that are governed by their topology. Among the many unusual properties of skyrmions is the tendency of their direction of motion to deviate from that of a driving force; the angle by which they diverge is a materials constant, known as the skyrmion Hall angle. In magnetic multilayer systems, where skyrmions often appear individually, not arranging themselves in a lattice, this deflection angle can be easily measured by tracing the real space motion of individual skyrmions. Here we describe a reciprocal space technique which can be used to determine the skyrmion Hall angle in the skyrmion lattice state, leveraging the properties of the skyrmion lattice under a shear drive. We demonstrate this procedure to yield a quantitative measurement of the skyrmion Hall angle in the room-temperature skyrmion system FeGe, shearing the skyrmion lattice with the magnetic field gradient generated by a single turn Oersted wire.

scholarly journals Study on evaluating the effectiveness of compost fertilizer from jackfruit peel and fiber with various local agricultural materials on Green Mustard (Brassica juncea)

2021 ◽  
Vol 332 ◽  
pp. 07001
Author(s):  
Thanh Tran ◽  
Van Thi ◽  
Tran Thi Bich Phuong ◽  
Loc Huu Ho ◽  
Le Thi Anh Hong
Keyword(s):  
Germination Rate ◽  
Organic Fertilizer ◽  
Control Sample ◽  
Organic Substrate ◽  
National Standards ◽  
Organic Carbon Content ◽  
Organic Substrates ◽  
Coconut Fiber ◽  
Three Samples ◽  
Agricultural Materials

In recent years, jackfruit production in Vietnam has been growing very strongly in both quantity and quality. However, most of the jackfruit is harvested and processed for meat, the rest is the jackfruit peels, and fibers are discarded, which will affect environmental sanitation. The study aims to enhance the value of jackfruit by taking advantage of nutrient ingredients in the peel and fiber of jackfruit to blend into organic fertilizer. Initial results show that the compost substrate samples mixed with rice husk ash and coir and the organic substrate sample mixed with coconut fiber had the best quality. Tested nutritional ingredients include including humidity is 76.1%, total organic carbon content is 27.3%, fulvic acid is 0.9%, humid acid is 0.9%, total nitrogen is 0.85%, total phosphorus is 0.57% after 35 days of incubation. Their quality meets the national standards of QCVN 01-189: 2019/BNNPTNT on fertilizer quality. After testing all three samples of organic substrates on the green mustard with germination rate (%), a number of branches, and total fresh weight (g), the results showed that test plants are grown with the compost from the shell - jackfruit fiber mixed with coconut fiber developed better than the control sample.

Low Stress Under Bump Metallizations for Direct Chip Attach

1998 ◽  
Vol 555 ◽  
Author(s):  
P. Su ◽  
T. M. Korhonen ◽  
S. J. Hong ◽  
M. A. Korhonen ◽  
C. Y. Li
Keyword(s):  
Flip Chip ◽  
Semiconductor Industry ◽  
Organic Substrate ◽  
Organic Substrates ◽  
Under Bump Metallization ◽  
Interfacial Failure ◽  
Stress Measurements ◽  
Rapid Reaction

AbstractIn order to use a flip chip method for bonding the Si chip directly to an organic substrate, compatible under bump metallization (UBM) must be available. Conventional schemes with a copper-based solderable layer are not well compatible with the high-tin solders (such as eutectic Pb-Sn) used with organic substrates. This is due to the rapid reaction between Sn and Cu which depletes the UBM of copper. Ni-based schemes exhibit slower reaction with the solder and have been identified by the semiconductor industry as preferable replacements to Cu-based UBM's. However, Ni-containing metallurgies are often associated with high stresses, which results in poor practical adhesion between the silicon chip and the metallization, leading to interfacial failure during fabrication or service. In this research, several nickel-containing UBM schemes are studied experimentally. Stress measurements are made for each metallization before patterning of UBM pads. An optimal Ni concentration for the UBM is suggested based on the results from this study.

The Oxford Handbook of the African Sahel

2021 ◽  
Keyword(s):  
Environmental Economic ◽  
Burkina Faso ◽  
The Political ◽  
Holistic View ◽  
Multiple Dimensions ◽  
Wide Range ◽  
Primary Focus ◽  
The Many ◽  
Core Characteristics ◽  
African Sahel

Bringing together a wide diversity of authors based on three continents and from different disciplinary backgrounds, this book offers analyses of a wide range of factors that characterize and that are shaping the future of the African Sahel. In forty chapters, organized in nine sections, the book examines this complex and rapidly changing region on multiple dimensions. Collectively, the book attempts to offer an understanding of the specificity of the Sahel, and to examine its core characteristics as shaped by the geographic, cultural, and political parameters that define it. Following a series of chapters focused on the shaping of the Sahelian space as a region, six chapters explore the distinct national trajectories of the countries of the political Sahel: Senegal, Mali, Niger, Burkina Faso, Mauritania, and Chad. The extraordinary combination of environmental, economic, and political challenges, and the ways in which Sahelian states and societies have responded, are the primary focus of the three subsequent sections, while the various parameters of the lived realities of these societies in motion are explored in the four final sections of the book. Transversally throughout, the chapters aim to offer an interdisciplinary and holistic view of the challenges and the dynamics that are shaping a region at a historical crossroads, and an understanding of the many factors that feed and perpetuate its vulnerabilities and fragilities, as well as its sources of resilience.

Microstructure Observation of Electromigration Behavior in Peripheral C2 Flip Chip Interconnection with Solder Capped Cu Pillar Bump

2011 ◽  
Vol 2011 (1) ◽  
pp. 000828-000836
Author(s):  
Yasumitsu Orii ◽  
Kazushige Toriyama ◽  
Sayuri Kohara ◽  
Hirokazu Noma ◽  
Keishi Okamoto ◽  
...  
Keyword(s):  
Aging Process ◽  
Flip Chip ◽  
Fem Simulation ◽  
Organic Substrate ◽  
Organic Substrates ◽  
Cross Sectional ◽  
Pillar Height ◽  
Cu Pillar ◽  
Fine Pitch ◽  
Low K

The electromigration behavior of 80μm bump pitch C2 (Chip Connection) interconnection is studied and discussed. C2 is a peripheral ultra fine pitch flip chip interconnection technique with solder capped Cu pillar bumps formed on Al pads that are commonly used in wirebonding technique. It allows us an easy control of the space between dies and substrates simply by varying the Cu pillar height. Since the control of the collapse of the solder bumps is not necessary, the technology is called the “C2 (Chip Connection)”. C2 bumps are connected to OSP surface treated Cu substrate pads on an organic substrate by reflow with no-clean process, hence the C2 is a low cost ultra fine pitch flip chip interconnection technology. The reliability tests on the C2 interconnection including thermal cycle tests and thermal humidity bias tests have been performed previously. However the reliability against electromigration for such small flip chip interconnections is yet more to investigate. The electromigration tests were performed on 80μm bump pitch C2 flip chip interconnections. The interconnections with two different solder materials were tested: Sn-2.5Ag and Sn100%. The effect of Ni layers electroplated onto the Cu pillar bumps on electromigration phenomena is also studied. From the cross-sectional analyses of the C2 joints after the tests, it was found that the presence of intermetallic compound (IMC) layers reduces the atomic migration of Cu atoms into Sn solder. The analyses also showed that the Ni layers are effective in reducing the migration of Cu atoms into solder. In the C2 joints, the under bump metals (UBMs) are formed by sputtered Ti/Cu layers. The electro-plated Cu pillar height is 45μm and the solder height is 25μm for 80μm bump pitch. The die size is 7.3-mm-square and the organic substrate is 20-mm-square with a 4 layer-laminated prepreg with thickness of 310μm. The electromigration test conditions ranged from 7 to 10 kA/cm2 with temperature ranging from 125 to 170°C. Intermetallic compounds (IMCs) were formed prior to the test by aging process of 2,000hours at 150°C. We have studied the effect of IMC layers on electromigration induced phenomena in C2 flip chip interconnections on organic substrates. The study showed that the IMC layers in the C2 joints formed by aging process can act as barrier layers to prevent Cu atoms from diffusing into Sn solder. Our results showed potential for achieving electromigration resistant joints by IMC layer formation. The FEM simulation results show that the current densities in the Cu pillar and the solder decrease with increasing Cu pillar height. However an increase in Cu pillar height also leads to an increase in low-k stress. It is important to design the Cu pillar structure considering both the electromigration performance and the low-k stress reduction.

Dynamics of the anaerobic utilization of organic substrates in an anaerobic/aerobic sequencing batch reactor

1995 ◽  
Vol 31 (2) ◽  
pp. 35-43 ◽  
Author(s):  
A. Carucci ◽  
K. Lindrea ◽  
M. Majone ◽  
R. Ramadori
Keyword(s):  
Sequencing Batch Reactor ◽  
Batch Reactor ◽  
Large Population ◽  
Organic Substrate ◽  
Organic Substrates ◽  
Total Carbohydrate ◽  
Fermentation Products ◽  
Virtual Absence ◽  
Floc Structure ◽  
Filamentous Microorganisms

The operation of an anaerobic/aerobic Sequencing Batch Reactor (SBR) with synthetic feed (glucose as the sole organic substrate) demonstrated periods of non-EBPR and EBPR operation in the absence of polyhydroxy alkanoate (PHA) storage. The glucose added as feed disappeared rapidly (within 10 minutes) and none of the normal fermentation products were detected in the supernatant in either mode of operation. Anaerobic/aerobic batch trials using the biomass from the SBR were conducted to examine the processes taking place and a rapid uptake of glucose was confirmed and was accompanied by a fall in pH. The biomass also demonstrated that anaerobic PHB storage occurred when acetate feed was used. The biomass was characterized by a large population of “G” bacteria, the absence of filamentous microorganisms, compact floc structure and high total carbohydrate (ca 40% w/w). The supernatant was characterized by low COD, TOC and the virtual absence of the glucose substrate. The observations indicate that EBPR was possible under circumstances which are not consistent with accepted mechanisms.

Anoxic Phosphate Uptake in the DEPHANOX Process

1999 ◽  
Vol 40 (4-5) ◽  
pp. 177-185 ◽  
Author(s):  
G. Bortone ◽  
S. Marsili Libelli ◽  
A. Tilche ◽  
J. Wanner
Keyword(s):  
Nitrogen Removal ◽  
Simulation Study ◽  
Nutrient Removal ◽  
Phosphate Uptake ◽  
Organic Substrate ◽  
Organic Substrates ◽  
Process Scheme ◽  
Removal Capacity ◽  
Influent Wastewater ◽  
P Removal

The innovative nutrient removal process scheme DEPHANOX proved to be very efficient because it maximises the utilisation of organic substrate for phosphorus and nitrogen removal. The process solves the competition for organic substrates among Poly-P organisms and denitrifiers as well as the problem of overgrowing of slow nitrifiers by faster organotrophs, typical of activated sludge. In experiments, DEPHANOX showed better P removal efficiency than a JHB configuration, working with a very low influent COD/TKN ratio. This paper reports the results of a simulation study that has been carried out to better understand the behaviour of the two configurations with a wide variety of influent wastewater characteristics and under dynamic conditions. The results of the simulation confirmed the high P removal capacity of the DEPHANOX configuration with low influent COD/TKN ratios.

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