From practical and theoretical viewpoints, performance analysis of communication systems by using information-theoretic results is important. In this paper, based on our previous work on Multiple Access Channel (MAC) and Multiple Access Relay Channel (MARC), we analyze the impact of a relay on the fundamental wireless communications concept, i. e., Coverage region of MARC, as a basic model for uplink communications between a base station and users with the help of a relay. This analysis includes the Coverage region for the MAC as a special case. Considering rate regions for the Gaussian MARC and fading Gaussian MARC, it is proved that in a fixed transmission rate, the relay extends Coverage region of the MARC. Numerical illustrations confirm our theoretical results.

Background and Aims: Metal-free and fiber-reinforced composite (FRC) restorations have drawn considerable attention and interest in recent years for restoring in the posterior area due to their improved esthetics. Fracture resistance is one of the most important mechanical properties of materials because of 500-600 N load of occlusion. The restorations should tolerate this load. The purpose of this in vitro study was to compare the fracture resistance of FRC with that of zirconia all-ceramic for posterior partial dentures.Materials and Methods: Forty extracted human intact teeth (20 first premolars and 20 first molars) selected for fabricating 10 pairs of fiber-reinforced composite and 10 pairs of zirconia all-ceramic bridges. After receiving standard tooth preparation, the teeth were mounted with 7.5 mm distance between each other. The bridges were made and cemented on the teeth. Then the restorations were stored in 37oC water for 30 days. The fracture resistance was measured using mechanical testing machine with cross-head speed of 1mm/min. Data were evaluated by Independent sample t test.Results: The mean fracture resistance in the ceramic group was 1329.41 N and for the F.R.C group was 1118.528 N with significant differences between them (P=0.034). The failure modes were mainly cohesive at pontic area for ceramic samples, but adhesive for FRC samples at pontic area.Conclusion: Both systems showed sufficient fracture resistance for using in posterior area.

We conducted this study in the Agogo Traditional Area of the Ashanti region of Ghana where there are numerous cases of conflicts between crop and animal farmers as a result of insufficient pasture for livestock, especially during the dry seasons. This has drawn the attention of various stakeholders in agriculture to the need for supplement feed through pasture establishment. The study examines farmers’ perception and the financial viability of pasture establishment for small ruminant production. The specific objectives of the study are as follow: to identify the cost and returns for the establishment of an acre of pasture, to assess the financial viability of pasture establishment on ‘cut and sell’ basis, to investigate farmers’ perception of pasture establishment for cattle production, to conduct a SWOT analysis of the establishment of pasture in Agogo. The study purports to analyze in detail, farmers' perceptions about the nature of the proposed 'Fodder Bank' policy and its likely effect on crop and livestock production, and whether the proposed policy could generate adequate monetary returns to induce its adoption at the farm level. The study seeks to provide evidence in support of SDG goals 2 (Zero hunger) and 12 (Responsible consumption and production) of the 2030 agenda for sustainable development. To the authors' best of knowledge, this is envisage to provide valuable information to support policy initiatives intended to tackle the root cause of farmer-herder conflicts. The Asante Akim North Municipal is one of the 27 administrative Districts in the Ashanti region. Its capital is Konongo- Odumasi. The population for this study comprises livestock and crop farmers in Agogo. Asante Akim North Municipal was purposively selected for the study because it is noted for its agrarian abilities and massive production of food in the Ashanti region. The multi stage sampling was employed in this study. At the first stage, Asante Agogo traditional area was selected purposively due to the fact that majority of the inhabitants engage in agricultural activities (GSS 2010). At the second stage, three communities in Agogo namely, Hwidiem, Ananekrom and Bebuso were selected purposively. At the third stage, quota sampling was used to obtain a specific number of farmers from each of the three communities to sum up to 150 respondents as shown in table. Simple random sampling technique was then used to engage the selected farmers in these communities. A sample size of 150 respondents were obtained using the Slovin’s formulae which is a scientific method of obtaining the sample size for a given population. Structured questionnaires consisting of open and close ended questions were used to gather primary data from respondents through face-to-face interviews. Interviews were conducted using the local dialect mostly to enhance communication and to clear all language barriers but English was used where the respondents could give accurate answers in English Language. Data per the questionnaires from respondents were concerning their perception of pasture establishment and the assessment of the strengths, weaknesses, opportunities and threats of pasture establishment. Secondary data was sought from books, journals, dissertations and the internet. Useful and relevant information on the appropriate materials and their costs for establishing pasture was also obtained from the Agogo MoFA office, and the KNUST Department of Animal Science. Descriptive statistics such as percentages, tables and means were used to analyze the socio-economic characteristics of respondents. It was revealed in the study that majority of crop farmers have had their crops destroyed by ruminants especially cattle at least once. Additionally, the study showed that pasture establishment is one way through which crop farms destruction by livestock can be prevented as about 99% of farmers responded in the affirmative. The results for the financial viability of the venture under the assumptions used gave relevant results with BCR of 1.18 and NPV of GHC 3,160. The Internal Rate Return of the venture is estimated at 40.1% and a Pay Back period of 2.61 years. Therefore, it will be economically prudent for investors to commit resources towards establishing pasture. The perception index for commercial, economic and financial concerns of pasture establishment was 3.7 which is skewed toward agree. The statement that had the highest positive perception index was about the fact that pasture establishment will increase the quality of meat. This implies that respondents perceive that the commercial, economic and financial results of pasture establishment will be positive. The perception index for the social category was 3.66. The statement with the highest positive assertion by respondents is the fact that pasture establishment will help control the movement of animals. The perception index of 3.66 which is skewed towards agree means that pasture establishment will attract the support from the community and also bring more benefits to the society. In the category of technical concerns of pasture establishment, the overall perception index for this category is 3.15, which means that the respondents perceive they have a fair technical know- how concerning pasture establishment even though the venture requires technical know-how. In the category of institutional concerns, support and involvement in pasture establishment, the statement with the highest perception index is that MoFA will support farmers with the necessary resources in its capacity. With reference to the chi-square test, the study can conclude that there is a significant relationship between the type of farmer and the perception that support can be drawn from farmer-based associations, and the perception that pasture establishment will increase livestock production as well as the general sales of farmers. Lastly, the study revealed that there is a significant relationship between the educational background of the farmer and the perception that it is not difficult to select planting materials for pasture establishment. Farmers in Asante Akim Agogo should adopt the establishment of pasture since it is financially viable. The establishment of pasture in Asante Akim Agogo should be encouraged since it has the potency to reduce the farmer - herder conflicts and ensure food security. For successful pasture establishment, technical know-how is essential.

Identifying the constraining factors of production and yield gap is very important. Therefore; this research was performed to identify the production constraining factors of local rice cultivars. All management practices from nursery preparation to harvesting stages for 100 paddy fields of local rice cultivars were recorded through field studies, in Sari, from 2015-2016. In the CPA, the actual and calculated potential yield were 4495 and 5703 kg/ha, respectively and the gap was 1221 kg/ha. The yield gap caused by number of top-dressing variables was 324 kg/ha, equal to 27% of the total yield gap. The yield gap related to previous year of legumes cultivation was 218 kg ha-1, equal to 18% of the total yield variation. Among the 10 variables entered in the CPA model, the effects of top-dress fertilizer application and its application frequency and foliar application were remarkable, which could compensate a significant part of the yield gap (444 kg/ha, 37% of total) in the farmers’ fields by managing these variables. According to boundary line analysis (BLA) finding, actual yield mean on the basis of optimal limit related to 12 variables under study was 5369 kg/ha, with 881 kg/ha yield gap . Mean relative yield and relative yield gap for 12 variables (transplanting date, seedling age, number of seedlings per hill, planting density, nitrogen and phosphorous per hectare, nitrogen before transplanting, harvesting date, lodging problem, pest problem, diseases problem and weeds problem) were 83.64 and 16.35 kg/ha, respectively. Based on the finding, it can be stated that the model precision is appropriate and can be applied for both estimation of the quantity of yield gap and determining the portion of each restricting yield variables.

Introduction: Coverage of bone grafts is very important in reconstructive surgery. In edentulous alveolar ridges this Coverage is particularly important for supporting dental prostheses. Here we present the case of a patient with a large deficient maxillary anterior region that was reconstructed with a bilateral palatal sub mucosal periosteal connective tissue flap: a soft tissue reserve for upper jaw reconstructive surgeries. The bilateral pediculated palatal periosteal connective tissue flap was used for Coverage of a large bone graft in the anterior maxillary region.Conclusion: Palatal sub mucosa can be used as a soft tissue reserve in upper jaw reconstructions.

Generally dams are considered as an integral part of the water source management system, which is effective in the regulating surface flows especially in areas with no uniform spatial distribution of rainfall and temporal. Considering the worldwide, developing trend for dam construction, especially in Iran, the necessity of reviewing the environmental impacts of dam construction becomes apparent. The main purpose of this paper is assessment of cultural and environmental impacts of dam on under irrigation and rural drainage network development. The method of research was qualitative and data were collected by interview, observation and transect base on theoretical protocol. Research population consist of council members in villages that covered by the dam irrigation and drainage network (N=48) that were chosen as the census. In order to analysis data were used mind maps and content analysis techniques. Results of content analysis showed that generally dam's cultural impacts are summarized in 6 general categories: cultural exchange, awareness, tourism, entertainment places revival, culture urbanization, destruction of social-cultural attachments. As well as the content analysis of research population, environmental impacts of dam include 4 types: 1-climate change, 2- entry of new species of birds to the region, 3-degraded landscapes and 4- green area.

Recognition and understanding the genetic control of traits, combining ability and genetic structure are directly related to the success of breeding programs. For this purpose, a 7 × 7 one-way diallel design was conducted in a randomized complete block design with three replications. The measured traits were included plant height, height to the first capsule, number of days to 50% and 90% of flowering, number of capsules per plant, number of seeds per capsule, number of days to physiological ripening, number of branches, leaves number and length, 1000-seeds weight, capsule weight, length and width, chlorophyll a, b and total chlorophyll, biological andeconomic yields, harvest index, oil and protein percentage. Analysis of variance showed that there was a significant difference between genotypes and diallel analysis showed that the additive variance of all traits and dominant variance of all traits except height to the first fruit-bearing capsule were significant. The oltan cultivar was the best and Ardestan genotype was the worst genotype in terms of general combining ability. Sabzevar×TS-3 and Sirjan×Fars were the best hybrids in most traits. The general heritability was between 0.90 to 0.96 for biologic yield and number of branches, respectively and narrow heritability was between 0.36 to 0.91 for the number of branches and harvest index, respectively. The analysis of variance by Hayman method confirmed the results of Griffing analysis.

To investigate the effect of weed interference and weed-free periods on Balangu (Lallemantia royleana Benth. in Wall) and to evaluate the critical period of weed control (CPWC) in this oilseed crop, an experiment was conducted as a randomized complete block design with three replications in Naghadeh region in 2018. Experimental consisted of two groups of treatments; weed infestation treatments (infestation for 144.2, 345.9, 574, 848.2, 1147.6 and 1451.3 growing degree day (GDD) after transplanting and then plots were remained weed-free the rest of the growing season) and weed-free treatments (weeding for 144.2, 345.9, 574, 848.2, 1147.6 and 1451.3 GDD after transplanting and then plots were remained infested until harvesting time). In each block, one weed free and weed infested control was for all the growing season. Results indicated that the density and dry biomass of weeds were increased as weed removal was delayed. In contrast, density and dry biomass of weeds were decreased as weeds establishment was delayed. Height, tetrachenes fruits, ripened achenes, 1000-seed weight and biological, seed and relative yields of Balangu were decreased and increased as the duration of weed-infested and weed-free period increased, respectively. Also, logistic and Gompertz curves fitted to data showed that the beginning and end of the CPWC based on a 10% yield loss of relative yield, was estimated to be from 11 to 108 days after transplanting (97 days weed-free period) in order to prevent a noticeable yield loss.