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Listing 56 - 20 of 2805 results.

Determination of Milk Composition, Bacteriology and Selected Blood Parameters of Dairy Goats Under Different Feeding Systems

Research Article
Author(s):
Journal: Animal Review

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Abstract
This research was carried out at two farms located in the Karacabey region of Turkey: an extensive goat farm (A) and a semi-intensive goat farm (B). A total of 32 Saanen goats (3 years old) at an early stage of their second lactation were selected from Farm A and Farm B. The total DM intake (TDM) values were 1.89 and 1.86 (kg d-1) for goats housed on the A and B farms, respectively. Compared with Farm A, Farm B produced more milk each day (P<0.05; 1.38 -. 1.76 kg day-1). The milk samples taken from Farm A had a higher (P<0.05) milk fat content than the samples from Farm B (milk fat=4.40 and 1.89 %, respectively). The serum creatinine values were significantly higher (P<0.05) in the blood of goats from farm A compared with farm B (1.11 and 0.56 mg dl-1, respectively). Comparison of glucose levels from both farms showed a significantly higher level of glucose in the blood samples from goats at Farm B (P<0.05; 24.23 and 61.43 mg dl-1). Serum parameters for cholesterol, GGT and urea were not affected by the feeding system (P > 0.05).
Contribution/ Originality
This study is one of very few studies which have investigated the milk composition, bacteriology and selected blood parameters of dairy goats under different feeding systems.

Agricultural Sciences » Animal Review » Month: 06-2016 Issue: 2

Genotypic Difference in Growth and Yield Related Traits of Onion (Allium Cepa L.) Varieties at Southern Tigray

Research Article
Author(s):
Journal: Current Research in Agricultural Sciences

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Abstract
Onion (Allium cepa L.) is the most common member of the family Amaryllidaceae (Alliaceae) which grows as a herbaceous biennial vegetable crop with cross pollinated and monocotyledonous behavior having diploid chromosomes number 2n=16. In order to identify Genotypic difference in growth, yield and yield related traits of Onion varieties, the field experiment was carried out at the research station of Mehoni Agricultural Research Center, southern, Ethiopia in the 2013 and 2014 cropping season under irrigation condition. The experiment was consisted of varieties of onion arranged in completely randomized block design with four replications. In 2013 cropping season, days to 50% maturity, bulb diameter and unmarketable were significantly affected by varietal difference. On the other hand, marketable yield, unmarketable yield and total yield were also influenced through varietal effect in 2014. The highest marketable yield (318.52 q ha-1) was obtained from Adama red variety; which, however, it was statistically on par with the marketable yield (289.26 q ha-1) at Nafis variety whereas the lowest marketable yield (222.41 q ha-1) was recorded at Nasik red variety in 2014 cropping season.
Contribution/ Originality
The paper`s primary contribution is finding that to study genotypic difference in growth and yield related traits of onion (Allium cepa L.) varieties at southern Tigray, Ethiopia. Then, it provides concrete information on the best adaptable varieties to the specific agro-ecology for onion growers particularly in the specific study area.  

Agricultural Sciences » Current Research in Agricultural Sciences » Month: 06-2016 Issue: 2

Study on Agronomic Evaluation of Tomato (Lycopersicon Esculentum, Mill.) Varieties for Phonological, Growth and Yield Characters

Research Article
Author(s):
Journal: Current Research in Agricultural Sciences

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Abstract
The field experiment was carried out at the research station of Mehoni Agricultural Research Center, Fachagama, Ethiopia in 2013 and 2014 cropping season under irrigation and in 2014 for rain fed experiment only. The experiment consisted of four commercial tomato varieties arranged in a completely randomized block design with four replications. In the 2013 cropping season, days to 50% flowering and maturity, plant height, fruit length, fruit diameter, number of fruits per plant, marketable yield, unmarketable yield and total yield were significantly influenced by varietal difference. Likewise, it was also observed that variety exerted a significance effect on establishment percentage, days to 50% maturity, plant height, number of fruits/plant and marketable yield under both irrigation and rain fed and on unmarketable yield under irrigation conditions of the 2014 cropping year. Under irrigation, the highest marketable yield (414.58 q ha-1) was obtained at Chali variety followed by Miya variety (289.17 q ha-1) in 2014 while the lowest value (110.83 q ha-1) was obtained from Melka sholla in the 2013 cropping season. Whereas the highest (295.58 q ha-1) and lowest marketable yields (283.33 q ha-1) were observed at Chali and Melksa sholla varieties under rain fed condition of the 2014 cropping season.
Contribution/ Originality
The paper`s primary contribution is finding that to study the agronomic evaluation of tomato (Lycopersicon esculentum, Mill) varieties for phonological, growth and yield related characters. In that case it provides tangible information and addresses the issues of best adaptable varieties to the specific agro-ecology for tomato growers.  

Agricultural Sciences » Current Research in Agricultural Sciences » Month: 06-2016 Issue: 2

Preliminary Study of Activated Carbon Filters for Pollutants Removal in Diesel Engines

Research Article
Author(s):
Journal: International Journal of Sustainable Energy and Environmental Research

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Abstract
Pollutants removal from combustion gases during diesel engines operation is one of the most widely known environmental applications of activated carbons. In order to guarantee the successful removal of contaminants and pollutants on activated carbons, the development of new adsorbents has been increasing in the last few years. This paper presents a systematic study for cleaning diesel engines of CO, SO2, NO2 and H2S using the process of physical adsorption on novel adsorbents obtained from tropical biomasses. The combustion gases were qualitative and quantitative analyzed by Gas Chromatography. The use of this simple method is a valuable alternative to meet emission standards in Developing Countries. It was demonstrated that the agricultural wastes studied here are a feasible alternative for granular activated carbons preparation for pollutants removal during diesel engines operation, approaching its efficiency to the commercial Catalytic Converters.
Contribution/ Originality
This study is one of a few studies which have investigated the use of agricultural wastes as alternative source for activated carbons preparation. The products synthetized trough this systematic investigation has the adequate adsorbent properties for environmental applications like pollutants removal during diesel engines operation.

Energy & Environmental Sciences » International Journal of Sustainable Energy and Environmental Research » Month: 06-2016 Issue: 2

Common Health Concerns in African Immigrants in the Us- Implications for the Family Physician

Research Article
Author(s):
Journal: International Journal of Medical and Health Sciences Research

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Abstract
African immigrants in the US encounter many issues on arrival to the US over time. The healthy immigrant effect (HIE) is a phenomenon that should be explored as many African immigrants lose their HIE on adoption of the ‘American lifestyle’. Family medicine practices in the US encounter a significant African immigrant population from different African countries, which is an underserved population. Highlighting their health issues will enable the family physician to become aware of their unique needs and manage these patients in their clinical practices. African immigrants tend to be viewed as ‘all from Africa’ when indeed Africa is a continent with 54 countries. Some of these unique health problems, though suffered by Americans may be differently manifested and therefore may require special management. Africans continue to migrate to the US and family medicine practitioners that are the first point of contact need to be educated to holistically manage them. Barriers to seeking health care and issues of physician patient relationship are important areas that also need to be explored in this special population.
Contribution/ Originality
This paper’s primary contribution is making family physicians aware of the individual needs of African immigrants from different countries. It emphasizes that unique medical conditions may present in different ways in this special population. It also emphasizes how respective African cultures may impact access to healthcare in the US.

Medical Sciences » International Journal of Medical and Health Sciences Research » Month: 04-2016 Issue: 4

Experimental Investigation of Dynamic Behavior of Shallow Foundation Resting on the Reinforced Sand with Embedded Pipes

Research Article
Author(s):
Journal: International Journal of Geography and Geology

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Abstract
One of the major concerns is to do with the foundations, such as compressors, railroads, roads and so forth, which are under the influence of the static and dynamic loads. These foundations which have been affected by the traffic loads are regarded as uniform and differential settlements. Sometimes a number of pipes are laid under these foundations, thereby influencing the related settlements. In this study, it has been shown that an increase in the dynamic load when both the initial static load and the pipe depth are constant leads to an increase in the settlement. As compared to the ordinary condition, the amount of settlement is greater. Also, it was revealed that the amount of soil settlement is reduced by 54%, as compared with the unreinforced soil, considering that the initial static load and the pipe depth are constant, and that the dynamic load has been applied, and that the grid-anchor system has been used. This research has focused mainly on introducing an appropriate and unified strategy to improve soil behavior using the reinforcements, which reduce the soil settlement in these shallow foundations. In addition, this paper presents the equations for both reinforced and unreinforced soil under dynamic loading to prevent such complicated calculation involved in deformation analysis. According to these equations, calculation of the permanent settlement for each foundation with a given size on the grid-anchor reinforced sand with and without embedded pipe is feasible.
Contribution/ Originality


Energy & Environmental Sciences » International Journal of Geography and Geology » Month: 09-2016 Issue: 9

Ultrasonic Effect on the Photodegradation of 2,4-Dichlorophenol Wastewater

Research Article
Author(s):
Journal: The International Journal of Biotechnology

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Abstract
Chlorophenols (CPs) is one of the organic pollutants and are most widespread in aqueous environment. Advanced oxidation processes (AOPs) have been extensively utilized for the decomposition of hazardous or recalcitrant pollutants in the environment. The study combined UV/TiO2 with ultrasonic procedure to degrade 2,4-dichlorophenol (2,4-DCP) wastewater. The effects of factors including pH value, initial concentration of 2,4-DCP and quantities of TiO2, Fe (II), and Fe (III) added on the removal efficiency of 2,4-DCP wastewater were investigated. Experimental results revealed significant additive effect attributed to the combination of two procedures, 13-watt UV irradiation and 10-watt ultrasound, under the pH 10 and 1g L-1 TiO2. In additional, the destruction removal efficiency (DRE) of 2,4-DCP was raised about 10 % when 250 ?M of Fe (II) and Fe (III) were added and this phenomenon was suggested that the Fenton-like reaction occurred.
Contribution/ Originality
This study uses new estimation methodology to combine the advantages of ultrasonic procedure and photodegradation procedure of TiO2 to treat 2, 4-DCP wastewater. In this study, the low ultrasonic energy was used and the Fenton-like reaction occurred to raise about 10 % destruction removal efficiency.

Biological Sciences » The International Journal of Biotechnology » Month: 02-2016 Issue: 2

Remote Sensing of Evapotranspiration in a Southern Mediterranean Forest. Application to Bissa Forest, Algeria

Research Article
Author(s):
Journal: The International Journal of Biotechnology

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Abstract
The Simplified Surface Energy Balance Index (S-SEBI) algorithm was used in this study with four Landsat-5 Thematic Mapper images to assess the evapotranspiration (ET) in Bissa forest, one of the healthiest Algerian forests located south of the Mediterranean Sea. Results showed that ET varies over the different seasons, the highest ET values were reached during the spring due to water availability, whereas, the lowest values were recorded during the summer. The relationship between normalized difference vegetation index (NDVI) and ET showed that the highest ET values coincide always with the highest NDVI except for January where even the lowest NDVI values correspond to higher ET. The intensity of ET was closely related to aspects, southeastern exposures showed the highest ET, whereas, northwestern exposures showed the lowest ET.
Contribution/ Originality
This study uses new estimation methodology of evapotranspiration, one of the most difficult climatic parameter to measure. Several classical approaches were developed to estimate evapotranspiration; in the opposite of these classical approaches we applied a new remote sensing algorithm to solve the energy balance equation in order to estimate evapotranspiration.

Biological Sciences » The International Journal of Biotechnology » Month: 03-2016 Issue: 3

A Simple Criterion for the Non-Existence of Limit Cycles of a Lienard System

Research Article
Author(s):
Journal: International Journal of Mathematical Research

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Abstract
In this paper, as an application in our results, the non-existence of limit cycles for the Liénard system  x ̇ = y –F (x), y ̇=-g(x)  with F (x)=(x^2-x) e^(-x)  (x≥-1)  and 5(x^2+x) e^(x+2)+2e (x≤-1),g(x)=x is discussed by the simple criterion. Graef [1] in 1971 has studied the uniformly boundedness of the solution orbits under the condition (C1) and further proved the existence of limit cycles under the conditions (C1) and (C2) . Recently, Cioni and Villari [2] in 2015 gave the same result as in Graef [1] under the conditions (C1) and (C3) includes (C2). Our aim is to discuss on the case of which (C1) is satisfied, but (C3) is not satisfied. As the result, we shall give the simple criterion for the non-existence of limit cycles for a Liénard system with these conditions.
Contribution/ Originality


Arts and Education » International Journal of Mathematical Research » Month: 02-2016 Issue: 2

Identity in Australia: A Case Study on the Role of Sport in the Ego Identity Formation Process

Research Article
Author(s):
Journal: Journal of Sports Research

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Abstract
This study explored how sport in Australia contributes to and informs the ego identity formation of an individual. A single female participant between the ages of 18 and 25 years participated in a series of interviews. The participant was selected on the basis of their chosen career path (i.e. PD/H/PE teaching) and their constant involvement in sport. Data collected from the interviews was analysed using grounded theory, principles of constant comparative analysis. Findings from the study indicate that identity is a single, multidimensional structure comprised of interrelated dimensions. In addition, further key findings indicate that sports act as a vehicle for individuals to ‘perform’ their identity to society. Through processes of self-enhancement and protection individuals protect their identity from threats, maintaining or enhancing the value placed upon it by others. Their choice of self-enhancement or protection and the consequent behaviour is determined by their self-concept (determined by social comparison) and societal values. The implications of this study lie with those in the education and sporting industries. Sport programs need to be positive, enjoyable and allow students to experience self-determination for optimal identity development and efficient function in society.
Contribution/ Originality


Physical Sciences » Journal of Sports Research » Month: 06-2016 Issue: 2

The Effects of Imagery on Muscle Performance and Pain Perception Associated with Delayed-Onset Muscle Soreness

Research Article
Author(s):
Journal: Journal of Sports Research

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Abstract
Research has indicated that imagery may aid in recovery from injuries and reduce the perception of pain in athletes during and after competitions. There is little research concerning acute pain and soreness, such as delayed-onset muscle soreness (DOMS). The purpose of this investigation was to determine whether the use of guided imagery for healing will affect soreness, pressure pain threshold (PPT), and muscle performance associated with DOMS. It was hypothesized that those who listened to a healing imagery script following inducement of DOMS would report less soreness, higher pain threshold, and have better muscle performance than a control group. Participants (thirty-eight) completed two days of testing with 48 hours between them. At the end of the first day, DOMS was induced by performing 6 sets of 15 reps of isokinetic eccentric exercise at -1.05 rad/sec. 20 participants listened to a healing imagery script 10 times within the 48 hours after inducement of DOMS while 18 listened to relaxing music. Each day consisted of tests of soreness, PPT, vertical jump, and a Wingate test. Healing imagery had no significant impact on perception of soreness, PPT, or vertical jump. The healing imagery group performed significantly better than the control group on the Wingate test in minimum power and power drop results following DOMS. Thus, it appears that imagery could impact long duration anaerobic performance as opposed to short duration explosive performance. Further research is needed to determine if healing imagery can improve performance on longer anaerobic and possibly aerobic activities. Additionally, it is possible that the limited exposure to the imagery in this investigation limited its ability to impact muscle performance and pain perception.
Contribution/ Originality
The paper’s primary contribution is the finding that healing imagery following inducement of DOMS improves anaerobic endurance performance while having no impact on perception of pain and vertical jump.

Physical Sciences » Journal of Sports Research » Month: 06-2016 Issue: 2

Empirical Evidence on Municipal Tax Policy and Firm Growth

Research Article
Author(s):
Journal: International Journal of Public Policy and Administration Research

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Abstract
There is relatively little research on whether city business tax structures either attract or repel business activity. Using very precise establishment-level data, the study examines the economic impacts of such taxes on all U.S. cities with populations over 40 thousand. Results indicate that activity-based city business taxes and sales taxes had statistically significant effects on the growths of business establishments and their related employment.
Contribution/ Originality
This is the first study to document overall business taxes paid by firms in U.S. cities. This is also the first study to show that higher levels of such city business taxes reduce employment and the number of establishments in U.S. cities.
Economics » International Journal of Public Policy and Administration Research » Month: 03-2016 Issue: 1

Emotional Workgroup Performance and Group Effectiveness Egyptian Context

Research Article
Author(s):
Journal: International Journal of Business, Economics and Management

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Abstract
This study is an exploratory study that aims to examine the impact of workgroup emotional climates on group effectiveness in Egypt. The paper contains a review of literature on the concept of workgroup emotional climate. The study findings reveal that workgroup emotional climate is correlated with group effectiveness. These findings open up new questions to be explored by future research.
Contribution/ Originality
This research contributes to the extant literature by developing an in-depth understanding of the relationship between workgroup emotional climate and group effectiveness. The study takes account of the features of different cultures, particularly the Egyptian culture. The study determines the explanation power of the Workgroup Emotional Climate (WEC) on group effectiveness.

Economics » International Journal of Business, Economics and Management » Month: 10-2016 Issue: 10

The Effect of Public Debt on Domestic Product and Unemployment (An Empirical Study on the Palestinian Economy)

Research Article
Author(s):
Journal: International Journal of Business, Economics and Management

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Abstract
This study sought to recognize the effect of public debt on unemployment and domestic product. Also, it aimed to identify the developments that occurred in some indices in the Palestinian economy. To achieve the goals of this study, the researchers employed the data covering the period (1999-2014) as well as the simple regression analysis. The findings showed that the percentage of public debt to gross domestic product amounted, on average, by 20%. Furthermore, it was found that there is a connection of statistical effect between the rate of public debt and the independent variable, rate of debt, to gross domestic product. Meanwhile, the findings showed no connection between the rate of public debt and gross domestic product.
Contribution/ Originality
Very few studies sought to tackle the topic of this study, or at least this topic was not dealt with from all angles. This paper is an addition to existing literature as it contributes to recognize the effect of public debt on  unemployment and domestic product. Furthermore, this study is among very few studies that use regression analysis in the period between (1999) and (2014) to highlight the aforementioned relationship.

Economics » International Journal of Business, Economics and Management » Month: 10-2016 Issue: 10

The Hartman-Wintner Law of the Iterated Logarithm for Noncommutative Martingales

Research Article
Author(s):
Journal: International Journal of Mathematical Research

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Abstract
In this study, we prove one of the fundamental strong laws of classical probability theory, the Hartman-Wintner’s law of the iterated logarithm for non-commutative martingale using a simple exponential inequality.
Contribution/ Originality
This study contributes in the existing literature by proving the Hartman-Wintner’s law of the iterated logarithm for non-commutative martingale using a simple exponential inequality as a counterpart of the Kolmogorov’s law of the law iterated logarithm.

Arts and Education » International Journal of Mathematical Research » Month: 02-2016 Issue: 2

Assessing the Catalytic Influence of Modern Information System and Socio-Economic Status on Communities’ Attitude and Awareness to Forest Resource Sustainability in Boki Local Government Area, Nigeria

Research Article
Author(s):
Journal: Review of Environment and Earth Sciences

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Abstract
Man as seriously endangered the forest ecosystem, perhaps due to lack of knowledge on the implications of his activities. This paper assesses the influence of modern information system and socio-economic status, attitude and awareness to forest resource sustainability and conservation in Boki Local Government Areal. Four communities were used of which six hundred copies of questionnaire were administered to residents in the area.  The socio-economic status and the modern information dissemination system were captured in the   questionnaire. Findings from the data collected show that communities with high socio-economic status have positive attitude and awareness to forest resource conservation and sustainability. This result was affirmed in the tested hypotheses which show a high calculated value greater than the critical value.
Contribution/ Originality
This study will help to bridge the gap in the existing literature. New methodology and formula were originated in this study. However, there is still insufficient data on the subject matter. Nevertheless, this paper will provide a baseline information on the effectiveness of information system  in forest resource management.

Energy & Environmental Sciences » Review of Environment and Earth Sciences » Month: 12-2016 Issue: 2

The Lead-Lag Relationships between Construction Investment and GDP: Granger Causality Tests and Impulse Responses Using Japanese Data

Research Article
Author(s):
Journal: The Economics and Finance Letters

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Abstract
This paper analyzes the lead-lag relationships between construction investment and GDP at business-cycle frequency by the tests of Granger causality and the impulse responses in the framework of the vector autoregression, using the annual Japanese data. The analysis find that private construction investment tends to lead GDP, not vice versa, in the Granger sense and is of value in predicting the course of GDP one year ahead. Government construction investment, on the other hand, tends to lag GDP.
Contribution/ Originality
This study is one of very few studies which have investigated empirically whether construction investment preceded the economic growth in business-cycle frequency within the methodological framework of Granger causality.

Economics » The Economics and Finance Letters » Month: 02-2016 Issue: 2

Forecasting-Based Carry Trade Using Pegged Currency: A Case of Omani Rial

Research Article
Author(s):
Journal: The Economics and Finance Letters

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Abstract
This paper examines the profitability of using an emerging country, currency that is pegged to the U.S. dollar in carry trade against floating currencies. It also examines the effect of embedding forecasting techniques in its profitability and risk-adjusted returns. While carry trade is performed largely with currencies that adapt a floating exchange rate system, conducting such a strategy using pegged currency has proven to be very rewarding, especially when the strategy is enhanced with forecasting methods. Carry trade is a speculative strategy where carry traders take advantage of interest rate differential between two currencies. It is conducted by borrowing a low interest rate currency and investing in a high interest rate currency. According to uncovered interest parity (UIP), carry trade should not yield any profit. If investors are both rational and risk-neutral, then exchange rate changes will eliminate any gains arising from the differential in interest rate. But literature has shown that UIP does not hold. This failure has led to unprecedented returns for that strategy matching the returns of the S&P 500 and outperforming it in terms of Sharpe ratio.
Contribution/ Originality
This study contributes to the existing literature on carry trade by examining the feasibility of using pegged currencies in such strategy. This study is one of the few studies which has investigated the effect of embedding forecasting methods in the selection process and its effect on return, risk and risk-adjusted returns.

Economics » The Economics and Finance Letters » Month: 02-2016 Issue: 2

Assessments of Market Oriented Beef Cattle Fattening System Under Farmer Management Condition in South Omo Zone of Snnpr

Research Article
Author(s):
Journal: Current Research in Agricultural Sciences

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Abstract
A sample survey was conducted in six  districts of three woreda in South Omo zone of SNNPR  to assess smallholder beef cattle fattening and  marketing systems under farmer management condition. Using a purposive sampling technique, a total of 120 households from six districts were included in the survey. The sample respondents indicated that about 97.5% were  castrate their animals for fattening purpose while only 2.5%  didn't. About 25.6%  of the sample respondents  had experience in fattening of uncastrated animals while 74.4% had not experienced in fattening uncastrated animal. About 90.6%  of the fattening system they carry out was outdoors,5.1% was indoor and 4.3% were both indoor and outdoor. About 78.9%  of the sample respondents indicated that the establishment of farmers' cooperative organization could help to exploit the existing livestock potential in a better way while 21.1% didn't think. About 77.9% Of the respondents indicated that although individual farmer tells the selling price for their own product, they were unable to sell at their own selling price. This is because market price setting for the product was by trader ,15.9% was by  negotiation,2.7% was  by farmer individually,1.8% respondents determined prices through involvement of brokers/middlemen-this offers the lowest profit margin for the producer due to the fee paid to the middle men and 0.9% was by both broker and negotiation. According to sample respondents, the majority of individual farmer didn’t set the price for their own product, they were price takers. Cattle marketing in the study area function at two levels, namely village level and primary markets. Market actors were producers, consumers, middlemen, restaurant owners, traders and butchers. The channels of cattle marketing was farmers-to-farmers, farmers-to-consumers, farmers-to-traders and farmers-to-butchers. Most of the feed resources were locally available Therefore, to increase the quality and number of animals fattened, providing farmers with sufficient training and extension services on improved cattle fattening technologies, adaptation and introduction of improved feeds and feeding system, market information are needed. Season and market locations were found to affect price of cattle suggesting the need to plan cattle fattening targeting season and market location to benefit farmers from better price, so that cattle fattening become sustainable.
Contribution/ Originality
The paper's primary contribution is finding that  investigating the existing cattle fattening practices and marketing systems, constraints and opportunities, the main actors in marketing of beef cattle fattening  and locally available feeds used for beef cattle fattening  in order to plan and develop improved cattle fattening and marketing systems.

Agricultural Sciences » Current Research in Agricultural Sciences » Month: 09-2016 Issue: 3

Model for Absorption of Perfluoropropane Intraocular Gas after Retinal Surgeries

Research Article
Author(s):
Journal: International Journal of Medical and Health Sciences Research

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Abstract
Purpose: The intended audience for this paper is retina surgeons who perform retinal detachment (RD) operations, anesthesiologists and dentists who use nitrous oxide, ophthalmologists and optometrists who encounter RD patients, students of ophthalmology and optometry, and RD patients, their families and friends. To help future retinal detachment (RD) and macular hole patients understand imminent eerie visual events, the author developed a mathematical model for the behavior of an injected intraocular C3F8 perfluoropropane gas bubble after an RD operation. Ophthalmologists could use this model to create animations showing patients what to expect. Methods: Our subject had three RD operations with the injection of perfluoropropane gas. After each of these operations, he daily recorded the horizon to gas bubble angle and the radius of curvature of the gas bubble. These data were used to calculate the volume and surface area of the gas bubble. Then formal modeling techniques were applied. Results:One gas bubble, which lasted 73 days, was studied extensively. Fitting the measured data required four geometric submodels, corresponding to the four possible bubble configurations. Conclusions: This model for the absorption of an intraocular gas bubble had two components: the structural component described the four geometric configurations that the bubble went through in its lifecycle and the dynamic component that described the absorption rate of the gas. The model suggests that the gas-bubble absorption-rate is not proportional to either the surface area of the bubble or the surface area between the SF6 gas and the aqueous humour. Rather the gas-bubble absorption-rate is proportional to the surface area of gas in contact with the retina.
Contribution/ Originality
This is the first paper to show the four sequential geometric models of an intraocular perfluoropropane gas bubble after a retinal detachment operation. This bubble is absorbed at a rate proportional to the amount of gas in direct contact with the retinal surface.

Medical Sciences » International Journal of Medical and Health Sciences Research » Month: 05-2016 Issue: 5