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Petrology and geochemical characteristics of Precambrian granitic basement complex rocks in the southernmost part of North-Central Nigeria

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Chinese Journal Of Geochemistry 2009年第4期28卷 377-385页

作者： Obiora s.C. ukaegbu V.u. National Geophysical Research Institute Geological Studies DivisionUppal Road Hyderabad-500007 India Department of Geology University of NigeriaNsukka Nigeria Department of Geology University of Port HarcourtPort Harcourt Nigeria

The Precambrian basement complex in the southernmost part of North-Central Nigeria is underlain by migmatitic banded gneisses, granitic intrusions and dykes of dolerite, rhyolite porphyry and pegmatite. The rocks are generally felsic, containing modal and normative hypersthene, as well as normative corundum. The basement complex has experienced high-grade regional metamorphism as indicated by the presence of hypersthene and plagioclase of andesine composition. Anatectic melting is suggested by the occurrence of ptygmatic folds, folded gneissose foliation, numerous quartzo-feldspathic veins and lenses of dark-colured, micaceous schistose rocks. Geochemically, the rocks have magnesian, calc-alkalic and strongly peraluminous characteristics. Their overall characteristics suggest derivation from progressive (fractional) partial melting of pelitic rocks during high-grade regional metamorphism, possibly associated with intense hydrothermal activities. The magnesian characteristics reflect close affinity to relatively hydrous, oxidizing melts and source regions in settings broadly related to subduction.

关键词：岩石地球化学特征前寒武纪基底尼日利亚花岗岩中央区域变质作用流纹斑岩叶状结构

Effectiveness of 3,4-Dimethylpyrazole Phosphate as Nitrification Inhibitor in soil as Influenced by Inhibitor Concentration,Application Form, and soil Matric Potential

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Pedosphere 2008年第3期18卷 378-385页

作者： G.BARTH s.VON TuCHER u.sCHMIDHALTER Chair of Plant Nutrition Technical University MunichD-85350 Freising-Weihenstephan(Germany)

The efficacy of nitrification inhibitors depends on soil properties and environmental conditions. The nitrification inhibitor 3.4-dimethylpyrazole phosphate （DMPP） was investigated in a sandy loam and a loamy soil to study its effectiveness as influenced by inhibitor concentration, application form, and soil matric potential. DMPP was applied with concentrations up to 34.6 mg DMPP kg^-1 soil as solution or as ammonium-sulfate/ammonium-nitrate granules formulated with DMPP. DMPP inhibited the oxidation of ammonium in both soils, but this effect was more pronounced in the sandy loam than in the loamy soil. When applied as solution, increasing DMPP concentrations up to 7 mg DMPP kg^-1 soil had no influence on the inhibition. The effectiveness of DMPP formulated as fertilizer granules was superior to the liquid application of DMPP and NH4^＋, particularly in the loamy soil. Without DMPP, a decline in soil matric potential down to -600 kPa decreased nitrification in both soils, but this effect was more pronounced in the sandy loam than in the loamy soil. DMPP was most effective in the sandy loam particularly under conditions of higher soil moisture, i.e., under conditions favorable for nitrate leaching.

关键词： 3,4-dimethylpyrazole phosphate DMPP fertilizer granules nitrification inhibitor

Impact of payment source, referral site, and place of residence on outcomes after allogeneic transplantation in Mexico

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World Journal of Transplantation 2024年第2期14卷 76-87页

作者： Andrés Gómez-De León Yesica A López-Mora Valeria García-Zárate Ana Varela-Constantino sergio u Villegas-De Leon Xitlaly J González-Leal Raúl del Toro-Mijares Anna C Rodríguez-Zúñiga Juan F Barrios-Ruiz Victor Mingura-Ledezma Perla R Colunga-Pedraza Olga G Cantú-Rodríguez César H Gutiérrez-Aguirre Luz Tarín-Arzaga Elías E González-López David Gómez-Almaguer Hematology service Universidad Autónoma de Nuevo LeónFacultad de Medicina y Hospital Universitario Dr.JoséEleuterio GonzálezMonterrey 64460Nuevo LeónMexico Hemato-logy service Clínica Gómez AlmaguerMonterrey 64710Nuevo LeónMexico Hematology service Instituto Tecnológico de Estudios Superiores de MonterreyTec SaludEscuela de Medicina Ignacio SantosMonterrey 64710Nuevo LeónMexico

BACKGROuND The impact of social determinants of health in allogeneic transplant recipients in low-and middle-income countries is poorly *** observational study analyzes the impact of place of residence,referring institution,and transplant cost coverage(out-of-pocket vs government-funded vs private insurance)on outcomes after allogeneic hematopoietic stem cell transplantation(alloHsCT)in two of Mexico's largest public and private *** To evaluate the impact of social determinants of health and their relationship with outcomes among allogeneic transplant recipients in *** In this retrospective cohort study,we included adolescents and adults≥16 years who received a matched sibling or haploidentical transplant from *** were selected without regard to their diagnosis and were sourced from both a private clinic and a public university Hospital in *** payment groups were compared:Out-of-pocket(OOP),private insurance,and a federal universal healthcare program“seguro Popular”.Outcomes were compared between referred and institution-diagnosed patients,and between residents of Nuevo Leon and *** outcomes included overall survival(Os),categorized by residence,referral,and payment *** outcomes encompassed early mortality,event-free-survival,graft-versus-host-relapse-free survival,and non-relapse-mortality(NRM).statistical analyses employed appropriate tests,Kaplan-Meier method,and Cox proportional hazard regression *** software included sPss and R with tidycmprsk *** Our primary outcome was overall *** included 287 patients,n=164 who lived out of state(57.1%),and n=129 referred from another institution(44.9%).The most frequent payment source was OOP(n=139,48.4%),followed by private insurance(n=75,26.1%)and universal coverage(n=73,25.4%).No differences in Os,event-free-survival,NRM,or graft-versus-host-relapse-free survival were observed for patients dia

关键词： Hematopoietic cell transplant social determinants of health Geography Haploidentical Out-of-pocket Financial toxicity survival Health services and outcomes Hematopoietic malignancy Aplastic anemia

Future u.s.-Russian Relations

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Contemporary International Relations 2008年第2期18卷 69-81页

作者： Wei Zonglei research fellow and Deputy Director of the Center for u.s.-European studies,CICIR. the Center for u.s.-European

Presidential changes in Russia and the *** open new opportunities for improving increasingly important bilateral relations,but expectations are not *** the elapse of the so-called Putin autocracy and the Bush unilateralism,u.s.-Russian relations are overshadowed by a new'Cold Word War,'if not a Cold *** *** continue to accuse Russia of running an autocracy in order to justify its own invasive foreign conduct and gain the moral *** two powers will be involved in a bitter struggle,alternating between offensives and defensives, containment and cooperation.

关键词：美国俄罗斯国际关系外交策略

Impact of sex on the outcomes of deceased donor liver transplantation

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World Journal of Transplantation 2024年第1期14卷 120-129页

作者： Oya M Andacoglu Isabel s Dennahy Nicole C Mountz Luisa Wilschrey Arzu Oezcelik Division of Transplantation and Advanced Hepatobiliary surgery University of UtahSalt Lake CityUT 84112United States Department of surgery University of EssenEssen D-45122Germany Department of surgery The University of Oklahoma Health Sciences CenterOklahoma CityOK 73117United States Department of surgery University of Oklahoma College of MedicineOklahoma CityOK 73117United States

BACKGROuND Data examining the impact of sex on liver transplant(LT)outcomes are *** is clear that further research into sex-related differences in transplant patients is necessary to identify areas for *** of these differences may help to identify specific areas of focus to improve on the organ matching process,as well as the peri-and post-operative care of these *** To utilize data from a high-volume Eurotransplant center to compare characteristics of male and female patients undergoing liver transplant and assess association between sex-specific variables with short-and long-term post-transplant *** A retrospective review of the university of Essen’s transplant database was performed with collection of baseline patient characteristics,transplant-related data,and short-term *** of these data were made with shapiro-Wilk,Mann-Whitney u,χ2 and Bonferroni tests applied where appropriate.A P value ofs accepted as statistically *** Of the total 779 LT recipients,261(33.5%)were *** patients suffered higher incidences of acute liver failure and lower incidences of alcohol-related or viremic liver disease(P=0.001).Female patients were more likely to have received an organ from a female donor with a higher donor risk index score,and as a high urgency offer(all Pseline characteristics of male and female recipients were also significantly *** multivariate hazard regression analysis,recipient lab-Model for End-stage Liver Disease score and donor cause of death were associated with long-term outcomes in ***-operative diagnosis of hepatocellular carcinoma,age at time of listing,duration of surgery,and units transfused during surgery,were associated with long-term outcomes in *** of complications was associated with long-term outcomes in both *** survival was similar in both males and females;however,when stratified by age,females<50 y

关键词： Liver transplant Outcomes survival Peri-and post-operative care

Drilling study on lightweight structural Mg/siC composite for defence applications

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Defence Technology（防务技术） 2019年第4期15卷 557-564页

作者： K. Balamurugan M. uthayakumar s. Thirumalai Kumaran G.s. samy u.T.s. Pillai Department of Mechanical Engineering VFSTR (Deemed to be University) Guntur 522213 India Faculty of Mechanical Engineering Kalasalingam University Krishnankoil 626126 Tamil Nadu India CsIR-NIIsT Material Science and Technology Division Thiruvananthapuram 695019 India

Heat energy generated during machining has been found to have a greater influence on determining the machinability of the *** this work,magnesium-based silicon carbide composite,which has been identified as a suitable lightweight application material,is prepared with the weight ratio of 90:10 by a stir casting *** available Hss drill tools with different diameters of 4,6 and 8 mm are used to perform the drilling operations with governing parameters of spindle speed,feed rate and constant depth of *** image camera of the FLIR E60 series is used to measure the temperature variation in the cutting zone at different operating *** influences of machining temperature on chip morphology,tool wear and surface profile of the machined samples are *** speed has been found to have a significant effect on machining *** spindle speed increases,the diameter of drill tool increases the tool wear and surface profile,*** abrasion and adhesive type of wears are observed in the drill ***,change from abrasion to adhesive wear is noticed with the increase of the diameter of the drill *** plots are drawn with respect to the interaction of governing parameters along with the working temperatures obtained under different machining conditions.

关键词： Magnesium siC Drilling Thermal effect Chip morphology Tool wear

Control strategies of avian influenza pandemic model with time delay

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International Journal of Biomathematics 2017年第7期10卷 219-236页

作者： u. Roman Z. Gul I. saeed u. Hakeem s. shafie Department of Mathematics Bacha Khan University Charsadda Khyber Pakhtunkhwa Pakistan Department of Mathematics University of Malakand Chakdara Dir(Lower) Khyber Pakhtunkhwa Pakistan Department of Mathematics Abdul Wali Khan University Mardan Khyber Pakhtunkhwa Pakistan Department of Mathematical sciences universiti Teknologi Johor Bahru Malaysia

A mathematical model for avian influenza with optimal control strategies is presented as a system of discrete time delay differential equations （DDEs） and its important math-ematical features are analyzed. In alignment to manage this, we develop an optimally controlled pandemic model of avian influenza and insert a time delay with exponential factor. Then we apply two controlled functions in the form of biosecurity of poultry and the education campaign against avian influenza to control the disperse of the dis- ease. Our optimal control strategies will minimize the number of contaminated humans and contaminated birds. We also derive the basic reproduction number to examine the dynamical behavior of the model and demonstrate the existence of the controlled system. For the justification of Our work, we present numerical simulations.

关键词： Time-delay optimal control existence numerical simulation

MODELING A sOLID BOuNDARY As A FLuID OF INFINITE VIsCOsITY

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Chinese Journal of Mechanical Engineering 2000年第1期13卷 2-9页

作者： Gingold Harry Gera Dinesh West Virginia university u. s. A West Virginia university 美国

A new approach to model viscosity in the conservation of momentum equations is presented and discussed. Coefficient of viscosity is modeled in such a way that it reaches asymptotically to infinity at the solid boundary but still yields a finite value for the shear stress at the solid wall. Basic objective of this research is to show that certain combinations of higher order normal velocity gradients become zero at the solid boundary. Malled solutions for the Couette flow and Poiseuille flow between two parallel plates are obtained by modeling the coefficient of viscosity in a novel way. Also, viscous drag computed by our model is expected to yield higher values than the values predicted by the existing models, which matches closely to the experimental data.

关键词： Coefficient of viscosity solid boundary Viscous drag

Magnesium (II) Adsorption from Aqueous solutions on China Clay and the stability Constants for Complex Formation

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Pedosphere 1998年第2期8卷 169-174页

作者： s．BEGuM F．u．KHAN PakistanCouncilofscientificandIndustrialResearchLabs Peshawer（Pakistan） PakistanCouncilofscientifican

China clay was employed as an adsorbent for the removal of Mg 2+ from water at pH 7.0 within the temperature range of 303～328 K. The linearity of the plots indicated Langmuir type isotherms. The reaction was exothermic. A maximum removal of 35% was obtained at 0.50 mmol L -1 metal concentration and a pH of 7.0 at 303 K. The H + rel /Mg 2+ ads ratio changed from a fractional value to 2.5. strong chemical bondings took place between oxygen atom of the surface and Mg 2+ , resulting in a surface complex species. Temperature had a significant effect on H + rel , and the stability constants also increased with increasing temperature.

关键词： H + releasing Mg 2+ adsorption stability constants temperature