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Potenziale di coagulazione dei polimeri naturali

Potenziale di coagulazione dei polimeri naturali

Ifeoma Obiora-Okafo; Okechukwu Onukwuli

Edizioni Sapienza
2020
pokkari
Sono state studiate le applicazioni del coagulante Vigna unguiculata (VUC), Telfairia occidentalis coagulante (TOC), Brachystegia eurycoma coagulante (BEC), Vigna coagulante sotterraneo (VSC) e Moringa oleifera coagulante (MOC) per la degradazione del colorante Crystal Ponceau 6 (AR 44). Analisi prossimale, infrarosso trasformato di Fourier (FTIR) e microscopia elettronica a scansione (SEM) sono stati applicati per indagare i potenziali di coagulazione dei precursori. Jar test ha studiato gli effetti dei parametri operativi tra cui pH, dosaggio del coagulante, concentrazione del colorante, tempo di sedimentazione e temperatura. La modellazione matematica di trasferimento di massa studiata mostra buone previsioni per i risultati sperimentali. Le isoterme mostrano l'adsorbimento come strato monomolecolare secondo il meccanismo di chemisorbimento. L'applicazione del modello cinetico di pseudo-secondo ordine convalida il processo come processo di secondo ordine. Metodologia della superficie di risposta, ha valutato con successo le interazioni di quattro parametri influenti.
Potencjal koagulacyjny naturalnych polimerów do degradacji barwników

Potencjal koagulacyjny naturalnych polimerów do degradacji barwników

Ifeoma Obiora-Okafo; Okechukwu Onukwuli

Wydawnictwo Nasza Wiedza
2020
pokkari
Badano zastosowanie koagulantu Vigna unguiculata (VUC), koagulantu Telfairia occidentalis (TOC), koagulantu Brachystegia eurycoma (BEC), koagulantu podziemnego Vigna (VSC) oraz koagulantu Moringa oleifera (MOC) do degradacji barwnika Crystal Ponceau 6 (AR 44). Zastosowano analizę proksymalną, analizę w podczerwieni z transformacją Fouriera (FTIR) oraz skaningową mikroskopię elektronową (SEM) w celu zbadania potencjal w koagulacyjnych prekursor w. W teście Jar'a badano wplyw parametr w operacyjnych, w tym pH, dawki koagulantu, stężenia barwnika, czasu i temperatury osadzania. Badane modelowanie matematyczne przeniesienia masy wykazuje dobre przewidywania do wynik w eksperymentalnych. Izotermy wykazują adsorpcję jako warstwę monomolekularną zgodnie z mechanizmem chemisorpcji. Dopasowanie modelu kinetycznego pseudo-sekundowego rzędu waliduje proces jako proces drugiego rzędu. Metodologia powierzchni odpowiedzi, z powodzeniem ocenila interakcje czterech wplywowych parametr w. Wykresy kontur w nakladek wskazują na przydatnośc stosowania wielu narzędzi do optymalizacji odpowiedzi. Badane koagulanty byly niezwykle skuteczne w usuwaniu barwnika z pąka krystalicznego 6.
Potenciais de Coagulação de Polímeros Naturais

Potenciais de Coagulação de Polímeros Naturais

Ifeoma Obiora-Okafo; Okechukwu Onukwuli

Edicoes Nosso Conhecimento
2020
pokkari
Foram investigadas as aplica es do coagulante Vigna unguiculata (VUC), do coagulante Telfairia occidentalis (TOC), do coagulante Brachystegia eurycoma (BEC), do coagulante Vigna subterr neo (VSC) e do coagulante Moringa oleifera (MOC) para a degrada o do corante Crystal Ponceau 6 (AR 44). An lise de proximidade, infravermelho transformado de Fourier (FTIR) e microscopia eletr nica de varredura (SEM) foram aplicados para investigar os potenciais de coagula o dos precursores. O teste em frasco estudou os efeitos dos par metros operacionais incluindo pH, dosagem do coagulante, concentra o do corante, tempo de assentamento e temperatura. A modelagem matem tica de transfer ncia de massa estudada mostra boas predi es para os resultados experimentais. As isotermas mostram a adsor o como uma camada monomolecular de acordo com o mecanismo de quimioqu mica. O ajuste do modelo cin tico de pseudo-segunda ordem valida o processo como um processo de segunda ordem. A metodologia da superf cie de resposta, avaliou com sucesso as intera es de quatro par metros influentes. Os gr ficos de contorno sobrepostos mostram a adequa o do uso de m ltiplas ferramentas de otimiza o de resposta.
Coagulation Potentials of Natural Polymers for Dye Degradation

Coagulation Potentials of Natural Polymers for Dye Degradation

Ifeoma Obiora-Okafo; Okechukwu Onukwuli

LAP Lambert Academic Publishing
2020
pokkari
The applications of Vigna unguiculata coagulant (VUC), Telfairia occidentalis coagulant (TOC), Brachystegia eurycoma coagulant (BEC), Vigna subterranean coagulant (VSC) and Moringa oleifera coagulant (MOC) for Crystal Ponceau 6 dye (AR 44) degradation were investigated. Proximate analysis, Fourier transformed infrared (FTIR) and Scanning electron microscopy (SEM) were applied to investigate the coagulation potentials of the precursors. Jar test studied the effects of operational parameters including pH, coagulant dosage, dye concentration, settling time and temperature. Mass transfer mathematical modelling studied shows good predictions to the experimental results. The isotherms show adsorption as a monomolecular layer according to the mechanism of chemisorption. The fitting of pseudo-second order kinetic model validates the process as a second-order process. Response surface methodology, successfully evaluated the interactions of four influential parameters. The overlay contour plots show the suitability of using multiple response optimization tools. The coagulants studied were extremely effective in the dye removal from crystal ponceau 6 dye.
An Examination of the Behaviour of Stock Prices on Ex-Dividend Day

An Examination of the Behaviour of Stock Prices on Ex-Dividend Day

Paul Obiora James

LAP Lambert Academic Publishing
2020
pokkari
The study adopted the ex-post facto design. Yearly panel data, quantitative technique, and judgemental sampling technique were used. The study focused on commercial banks that have shown proven evidence of consistent payment of cash dividends. The mathematical tool was used to determine the RPR, MAPR, RPD, MAPD, and MAAR respectively. It was documented that stock price drop / fall more than the dividend amount on the ex-dividend day, thereby creating an abnormal return to short term traders. Also, there exists a strong positive association between ex-div days and dividends and cum-div days. The impact of the economic recession is adverse on stock prices, and this creates downward pressure/ shock on share prices as unstable investors rush to sell their stock ex- or cum-div. We, therefore, suggest that investors should convert their investment into more risk-free securities like gold, government bond, treasury bills, etc.
The Nigeria-Biafra War, OAU and the Politics of Diplomatic Recognition of Biafra, 1967 - 1970
Drawing upon a rich historical methodology that is thematic, chronological, and descriptive, this book delves into one of Africa's most defining conflicts - the Nigeria-Biafra War (1967-1970) - with a particular focus on the Organization of African Unity (OAU) and the politics of recognition extended to Biafra during the Civil War. It explores the factors that motivated four African states to defy the OAU's collective stance by granting de facto recognition to the Biafran regime, examining the nature, dimensions, and far-reaching implications of such actions. Spanning the disciplines of History, International Relations, Political Science, and International Law, this compelling study offers fresh insight into the complex interplay between African diplomacy, national interest, and moral responsibility during a time of continental upheaval. The findings reveal that the recognition of Biafra by four African nations not only prolonged the war but also exposed contradictions within the OAU's charter and Nigeria's internal policy claims. Furthermore, while the blockade and humanitarian crisis galvanized global sympathy for Biafra, the conflict ultimately underscored how power politics and realist interests prevailed over humanitarian ideals. This book is an essential read for scholars, students, and readers seeking to understand the diplomatic dynamics, ideological divides, and moral dilemmas that shaped Africa's response to one of its most tragic wars.
Dealing with Bribery and Corruption in International Commercial Arbitration
International Arbitration Law Library, Volume 65 International commercial arbitration is by no means free from bribery and corruption. Although a plethora of legal scholarship clearly affirms this contention, a thorough study on the particularly important question of the authority and duty of international commercial arbitrators to investigate a suspicion or indication of bribery or corruption sua sponte ¬- that is, on their own initiative - has been surprisingly lacking. This important book fills this gap, inter alia, by locating sua sponte authority in the position of arbitral tribunals in establishing the facts of a case and ascertaining and applying the applicable normative standards. In addition to providing a comprehensive examination of how the issue of bribery and corruption is dealt with in contemporary international commercial arbitration, the book also highlights the role of arbitrators in global efforts to combat transnational commercial bribery and corruption. Among others, the following critical issues are thoroughly investigated: arbitrability of issues of public interests; intermediary contracts; role of arbitrators in the fact-finding process; party autonomy versus overriding mandatory rules; iura novit curia in international commercial arbitration in the context of bribery and corruption; notion of transnational (or 'truly international') public policy; arbitrators' duty to act as guardians of international commerce; investigative tools available to arbitrators; dealing with manifestly recalcitrant parties; possible consequences of violating the obligation to sua sponte investigate; and the view from developing countries. The analysis leans primarily on Swiss law, as Switzerland is one of the most important jurisdictions in international commercial arbitration; Switzerland has also been involved in some of the most famous and controversial arbitration cases wherein bribery and corruption became an issue. However, the study also includes a comparative analysis of the relevant laws, jurisprudence, and doctrine of other major arbitration venues, particularly England, France, and Germany. Not only in the light it sheds on how and whether international commercial arbitrators have hitherto justified the trust States have placed in them regarding the protection of the public interests but also in the practical solutions it offers arbitrators faced with issues of bribery and corruption, this deeply researched book equips arbitration practitioners and arbitration institutions with a hitherto lacking in-depth analysis on the question of sua sponte investigation. It also provides invaluable insights on how this issue might affect the future, legitimacy and expansion of this dispute settlement mechanism. Outside the field of arbitration, the book also provides jurists, legal scholars, in-house counsel for companies doing transnational business and public officials with highly enlightening perspectives on the interaction between international commercial arbitration and public interests.
Moonlight tales

Moonlight tales

Okoye Johnson Obiora

Morandi s.r.o.
2020
pokkari
Little wonder why animals behave and look the way they are: fishes live in the water, penguins do not fly, cats (leopard, tiger, lion) are distinct, cats hate rats, kites hover over flames of fire, snakes have neither hands nor legs, toads have no tail, women do not grow beard?Moonlight tales is a compilation of twenty fiction and short fantasy tales, nineteen of which are centred on animals. It explores and reveals the genesis and reasons why animals behave and look the way they are. Each tale ends with a simple crossword and questions that could help improve a child's intellect and moral standards. The tales are accompanied by 40 full-page illustrations created by talented artist Tereza Dost lov .It is a children picture book manuscript.
A Past That Breathes

A Past That Breathes

Noel A. Obiora

Rare Bird Books
2021
sidottu
In January 1995, a promising young musician was found murdered in her apartment in West Los Angeles. There were no eyewitnesses to the crime, but someone saw her arguing with her ex-boyfriend, an African American man, the day before she was found dead. With the city in the throes of the O.J. Simpson trial at the time, LAPD was not about to let another African American skip town after killing a white woman. They arrested the ex-boyfriend on circumstantial evidence but ignored other evidence found at the scene of the crime that did not support their case.This collection of evidence, and LAPD's questionable tactics, did not sit well with the younger of two deputy district attorneys assigned to the case. Worse still, the defendant had hired a lawyer with whom the younger deputy district attorney had strong mutual attractions in college and had started seeing again. Caught in a web of the ideals they swore to uphold, an affair that could destroy their careers, and social and systemic racism, the young lawyers, both trying their first murder case, are plunged into the realities of a divided city and their place within it.
Obioma Plays Football

Obioma Plays Football

Chika Unigwe

Cassava Republic Press
2022
nidottu
8 year-old Obioma is a football star. She uses a special stick to score goals and never loses a race in her wheelchair! But when she moves to a new city, she has to go to a new school where she has no friends, and everyone calls her "the girl with the wheelchair". Obioma misses playing football most of all, until one day a girl named Ayana asks her to race. Once they start playing football, everyone joins in and Obioma finds a new team to play with!
Obioma Plays Football

Obioma Plays Football

Chika Unigwe

Cassava Republic Press
2023
sidottu
9 year-old Obioma is a football star. She uses a special stick to score goals and never loses a race in her wheelchair! But when she moves to a new city, she has to go to a new school where she has no friends, and everyone calls her “the girl with the wheelchair”. Obioma misses playing football most of all, until one day a girl named Ayana asks her to race. Once they start playing football, everyone joins in and Obioma finds a new team to play with!
Obioma (Igbo edition)

Obioma (Igbo edition)

Chika Unigwe

Cassava Republic Press
2023
sidottu
8 year-old Obioma is a football star. She uses a special stick to score goals and never loses a race in her wheelchair! But when she moves to a new city, she has to go to a new school where she has no friends, and everyone calls her “the girl with the wheelchair”. Obioma misses playing football most of all, until one day a girl named Ayana asks her to race. Once they start playing football, everyone joins in and Obioma finds a new team to play with!