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Search Results: 1 - 10 of 4437 matches for " Neufeldt Henry "
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Geoecological drivers of cerrado heterogeneity and 13C natural abundance in oxisols after land-use change
Neufeldt, Henry;
Revista Brasileira de Ciência do Solo , 2006, DOI: 10.1590/S0100-06832006000500015
Abstract: the 13c natural abundance technique was applied to study c dynamics after land-use change from native savanna to brachiaria, pinus, and eucalyptus in differently textured cerrado oxisols. but due to differences in the d13c signatures of subsoils under native savanna and under introduced species, c substitution could only be calculated based on results of cultivated soils nearby. it was estimated that after 20 years, pinus c had replaced only 5 % of the native c in the 0-1.2 m layer, in which substitution was restricted to the top 0.4 m. conversely, after 12 years, brachiaria had replaced 21 % of cerrado c to a depth of 1.2 m, where substitution decreased only slightly throughout the entire profile. the high d13c values in the subsoils of the cultivated sites led to the hypothesis that the natural vegetation there had been grassland rather than cerrado sensu stricto, in spite of the comparable soil and site characteristics and the proximity of the studied sites. the hypothesis was tested using aerial photographs of 1964, which showed that the cultivated sites were located on a desiccated runoff head. the vegetation shift to a grass-dominated savanna formation might therefore have occurred in response to waterlogging and reduced soil aeration. a simple model was developed thereof, which ascribes the different cerrado formations mainly to the plant-available water content and soil aeration. soil fertility is considered of minor significance only, since at the studied native savanna sites tree density was independent of soil texture or nutrient status.
Reducing subsistence farmers’ vulnerability to climate change: evaluating the potential contributions of agroforestry in western Kenya
Thorlakson Tannis,Neufeldt Henry
Agriculture & Food Security , 2012, DOI: 10.1186/2048-7010-1-15
Abstract: Subsistence farmers are among the people most vulnerable to current climate variability. Climate models predict that climate change will lead to warmer temperatures, increasing rainfall variability, and increasing severity and frequency of extreme weather events. Agroforestry, or the intentional use of trees in the cropping system, has been proposed by many development practitioners as a potential strategy to help farmers reduce their vulnerability to climate change. This study explores whether and, if so, how agroforestry techniques can help subsistence farmers reduce their vulnerability to climate change. From field research conducted in western Kenya, we find that households are not currently coping with climate-related hazards in a sustainable way. Farmers are aware of this, and believe that the most effective way to adapt to climate-related shocks is through improving their general standard of living. We evaluated agroforestry as one possible means of improving farmers’ well-being. By comparing farmers engaged in an agroforestry project with a control group of neighboring farmers, we find that involvement in agroforestry improves household’s general standard of living via improvements in farm productivity, off-farm incomes, wealth and the environmental conditions of their farm. We conclude that agroforestry techniques can be used as an effective part of a broader development strategy to help subsistence farmers reduce their vulnerability to climate-related hazards.
Free Secondary Education and the Changing Roles of the Heads of Public Schools in Tanzania: Are They Ready for New Responsibilities?  [PDF]
Henry Godda
Open Journal of Social Sciences (JSS) , 2018, DOI: 10.4236/jss.2018.65001
This study investigated the management capacity of heads of public secondary schools in the implementation of Free Secondary Education (FSE) policy in Singida municipality. The study was descriptive research survey which employed both qualitative and quantitative research designs. Questionnaires and interviews were used to collect data from 200 teachers, 10 school heads and 5 municipal secondary education officers. The findings indicated that heads of public secondary schools in Singida municipality possessed managerial skills to run their schools effectively despite of being faced by several challenges, like inadequate funds to cater for some of the school needs, misconception by parents that FSE policy catered for all the fees and rapid increase of student enrollment. The findings further revealed that school heads use informal and formal coping strategies like community participation and informal peer coaching to manage the challenges of FSE.
Efficient Theoretical Screening of Solid Sorbents for CO2 Capture Applications  [PDF]
Yuhua Duan, David Luebke, Henry Henry Pennline
International Journal of Clean Coal and Energy (IJCCE) , 2012, DOI: 10.4236/ijcce.2012.11001
Abstract: By combining thermodynamic database mining with first principles density functional theory and phonon lattice dynamics calculations, a theoretical screening methodology to identify the most promising CO2 sorbent candidates from the vast array of possible solid materials has been proposed and validated. The ab initio thermodynamic technique has the advantage of allowing identification of thermodynamic properties of CO2 capture reactions without any experimental input beyond crystallographic structural information of the solid phases involved. For a given solid, the first step is to attempt to extract thermodynamic properties from thermodynamic databases and the available literatures. If the thermodynamic properties of the compound of interest are unknown, an ab initio thermodynamic approach is used to calculate them. These properties expressed conveniently as chemical potentials and heat of reactions, which obtained either from databases or from calculations, are further used for computing the thermodynamic reaction equilibrium properties of the CO2 absorption/desorption cycles. Only those solid materials for which lower capture energy costs are predicted at the desired process conditions are selected as CO2 sorbent candidates and are further considered for ex- perimental validations. Solid sorbents containing alkali and alkaline earth metals have been reported in several previous studies to be good candidates for CO2 sorbent applications due to their high CO2 absorption capacity at moderate work- ing temperatures. In addition to introducing our computational screening procedure, in this presentation we will sum- marize our results for solid systems composed by alkali and alkaline earth metal oxides, hydroxides, and carbonates/bicarbonates to validate our methodology. Additionally, applications of our computational method to mixed solid systems of Li2O with SiO2/ZrO2 with different mixing ratios, our preliminary results showed that increasing the Li2O/SiO2 ratio in lithium silicates increases their corresponding turnover temperatures for CO2 capture reactions. Overall these theoretical predictions are found to be in good agreement with available experimental findings.
The nature of neuronal words and language  [PDF]
Morris Henry Baslow
Natural Science (NS) , 2010, DOI: 10.4236/ns.2010.23032
Abstract: Individual neurons in the brain possess natural language in the form of energy-dependent ac-tion potentials or spikes (S) operating on a mil-lisecond timescale that, along with pauses (P) between spikes, constitute a two letter (S, P) “alphabet” that is used to generate meaningful frequency-encoded neuronal “words”. These words are then used to transmit information to other neurons in the form of phrases consisting of two or more words that are contained within longer pause-delineated structured declarative sentences. In this article, the nature of neuronal words and language are described, and exam-ples provided that illustrate the way in which neuronal language is used by the brain to in-teract with and interpret both its internal and external environments. It is hoped that a fuller understanding of the language used by neurons to communicate may lead to development of novel treatments for a number of human neu-ropathies.
Water Myths: The Illusion of Canada’s Endless Water Supply  [PDF]
Henry Gordon-Smith
Journal of Water Resource and Protection (JWARP) , 2012, DOI: 10.4236/jwarp.2012.410093
Abstract: This paper explores the common misconception that Canada has an infinite supply of freshwater. The true amount of water availability in Canada is explored, and the location of the majority of Canada’s water supply is described. As a consequence of a more precise assessment of Canada’s actual hydrologic situation the paper seeks to dash the dangerous myth of Canada’s water inexhaustibility, which is straining the country’s precious resource increasingly. Finally, this paper discusses the major threats to Canada’s water supply, which are from both external factors as well as its internal sociopolitical weakness. A solution to these problems is considered.
The Market Effects of Patent Litigation  [PDF]
Matthew D. Henry
Technology and Investment (TI) , 2013, DOI: 10.4236/ti.2013.41007

This study measures the value of patents to firms and identifies factors that contribute to that value by observing the abnormal change in firms stock market values following court decisions. Firms lose 0.85% (about $19 million) of their value following a decision that one of their patents is “Invalid”, but only gain about 0.7% following a Valid & Infringed decision. The factors that that affect the expectations of investors as to the enforceability of patent rights are at least as important in determining the contribution of the patent to the firms market value as are characteristics of the patent. Most prominently, this confirms the substantial impact that the creation of the Court of Appeals for the Federal Circuit (CAFC) had on the value of patents. After the creation of the CAFC, “Invalid” decisions resulted in a 0.7% (about $15.5 million) greater loss of firm value. Clearly, patents are more valuable because of this change in the legal landscape.

The Concept of Oncoplastic Breast Surgery Applied in Surgery for a Giant Fibroadenoma  [PDF]
Michael Rose, Henry Svensson
Case Reports in Clinical Medicine (CRCM) , 2014, DOI: 10.4236/crcm.2014.34048

The treatment of a 40-year-old woman with a giant fibroadenoma in her left breast is presented. The fibroadenoma measured 14 × 5 × 3 cm and weighed 170 g. We demonstrate that the surgical strategy and the reconstructive techniques in oncoplastic breast cancer surgery successfully can be applied to the treatment of these rare benign tumours improving the cosmetic and functional outcome.

Quality Assessment of Artemether/Lumefantrine Tablets Sampled from Pharmacies in Accra, Using the MVHimagePCv8.exe Color Software  [PDF]
Ebenezer Adu Nyarko, Henry Nettey
Pharmacology & Pharmacy (PP) , 2013, DOI: 10.4236/pp.2013.48081
Abstract: Background: Widespread resistance has been recorded with the use of monotherapy in the management of malaria. In 2000, Ghana initiated the process of using Artemisinin-based combination therapy (ACT) following the World Health Organization’s (WHO) recommendation. Globally and in Ghana, there stands a high risk of development of resistance to the ACTs due to the act of counterfeiting or substandard drugs. In 2009, there was a report that fake Coartem, an ACT had been found in Ghana by the Drug Quality and Information (DQI) Program; this is a serious national problem that needs redress thus the need to conduct this study to check if there are any substandard or counterfeit Artemether/ Lumefantrine tablets on the Ghanaian market. Method: Using Representative sampling method, a total of nine different brands or samples of artemether/lumefantrine tablets were sampled from nine different Pharmacies in Accra. The samples were analyzed using a validated MVHimagePCv8.exe colour software technology. Results: The International Conference on Harmonization (ICH) and United States Pharmacopoeia (USP) recommend that for assay of tablets, the percentage concentration should fall within 80%-120%. After the analysis, seven out of the nine samples passed the test to varying degrees. Two samples (AL-S4 and AL-S6) however failed the test with AL-S4 recording artemether concentration (126.07%) above and Lumefantrine concentration (78.38%) below the recommended figure while AL-S6’s 51.53% failed to meet the minimum allowable concentration for lumefantrine in a tablet. Conclusion: The results presented show that some Artemether/Lumefantrine tablets on the Ghanaian market still have issues with regards to quality or level of active ingredients. There would therefore be the need for further studies to be conducted into these products especially those that failed the test.
Geographic Information Technologies for the Study of Mass Wasting Hazards  [PDF]
Henry Pacheco, Carlos Suárez
International Journal of Geosciences (IJG) , 2014, DOI: 10.4236/ijg.2014.55048

The purpose of the research was to obtain the mass wasting hazard map for the state of Vargas, central coast of Venezuela, using GIS technology. The work was developed through the heuristic method with the generation of thematic digital maps, univariate statistical treatment, weighting of each variable and quantifying the relationship of each parameter unit regarding mass wasting processes. The algorithm designed to perform map algebra was designed using the variables: surface geology, slope, slope orientation, terrain curvature, moisture topographic index, power index surface flow rate and capacity sediment transport and the rate normalized difference vegetation. The results show a distribution of landslide hazard with the highest values in the west central part of Vargas state, where the dominant lithology is incompetent, and combined with topographic elements, determining high instability, meanwhile the lower hazard areas were found in specific areas such as the middle watershed areas east of the state. The calibration of this model shows a reliability of 80%, so it is highly advisable to use the information generated in this work by governmental and non-governmental organizations in the planning, management and use of land.

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