320 research outputs found
Fady Ortiz Roca - Historias de vida
No full textEn esta grabación Fady Ortiz Roca relata sus recuerdos en el sector de Dave Hill; describe a las familias Raizales que vivían en este sector. Además describe cómo fue su crianza dentro de los valores del pueblo Raizal. Relata como fue su participación en diferentes grupos juveniles, al igual que sus aventuras en los bosques. También nos cuenta como fue la perdida de sus amistades por el narcotráfico y su proceso de formación en las universidades públicas.(Min: 00:00 a Min: 08:15) Dave Hill y las familias Raizales - (Min: 08:15 a Min: 10:14) El Huracán Joan - (Min: 17:20 a Min: 20:40) El momento más feliz de mi vida - (Min: 20:40 a Min: 25:43) La universidad - (Min: 25:43 a Min: 28:42) Mi primer trabajo - (Min: 28:42 a Min: 33:53) Consejo a mi versión más joven y mi última volunta
Design and Optimization Loop Filters in Fixed WiMAX PLL Using LMI Method
No full textAchieving an optimal design of phase-locked loop (PLL) is a major challenge in WiMAX technology in order to improve system behavior against noise and to enhance Quality of Service (QoS). A new loop filter design method for PLL is introduced taking into consideration various design objectives such as small settling time, small overshoot and meeting Fixed WiMAX requirements. Optimizing conflicting objectives is accomplished using semi-Definite programming (especially Linear Matrix Inequality (LMI)) in conjunction with appropriate adjustment of certain design parameters. Infinite Impulse Response (IIR) and Finite Impulse Response (FIR), Digital filters are designed by Semi-Definite Programming (SDP) using SeDuMi (self-dual minimization) toolbox software. Design efficiency and performance of the proposed method are illustrated by simulations and comparisons to other design methods. Simulations showed that the IIR digital low pass filter which was designed by SDP is better than the IIR digital low pass filter which Al-Quqa “in [32]” designed by Linear Programming (LP). Simulations show that the FIR digital low pass which was designed by SDP using SeDuMi software is better than the FIR digital low pass filter which was designed in [32] by SDP using CVX (convex optimization tool) software. The minimum-length FIR filter algorithm was used to proof that the order of the FIR filter which was designed using SDP method and simulated using toolbox software (SeDuMi) is optimal for our design specifications
نظام الطاقة الهجين لمركز الحجر الصحي في دير البلح في قطاع غزة ، فلسطين
No full textA new off-grid Hybrid Energy System (HES) for Dier El Balah quarantine center (middle Gaza Strip, Palestine) that was built to host the infected Corona virus (COVID-19) people is studied. The proposed system is made up of three energy sources mainly photovoltaic (PV), wind, and a diesel generator. The HES is proposed to supply a load of 3952 KW/day. Further consideration is given to technical and economic effects. HOMER program is used to develop an optimal system from the practical view point. The simulation results provide suitable HES to power the Dier El Balah quarantine center considering different factors such as environmentally friendly, cost-effective and affordable electricity, as compared to using only diesel generators with lowestCOE equals 0.348 US$/kWh.تمت دراسة نظام طاقة هجين جديد خارج الشبكة لمركز الحجر الصحي في دير البلح (وسط قطاع غزة ، فلسطين) والذي تم إنشاؤه لاستضافة المصابين بفيروس كورونا (COVID-19). يتكون النظام المقترح من ثلاثة مصادر للطاقة بشكل رئيسي الكهروضوئية (PV) وطاقة الرياح ومولد الديزل. يقترح HES لتزويد حمولة 3952 KW / يوم. يتم إيلاء مزيد من الاعتبار للتأثيرات التقنية والاقتصادية. يستخدم برنامج HOMER لتطوير نظام أمثل من وجهة نظر عملية. توفر نتائج المحاكاة HES مناسبة لتشغيل مركز الحجر الصحي في دير البلح مع الأخذ في الاعتبار عوامل مختلفة مثل الكهرباء الصديقة للبيئة والفعالة من حيث التكلفة وبأسعار معقولة ، مقارنة باستخدام مولدات الديزل فقط مع أقل COE يساوي 0.348 دولار أمريكي / كيلووات ساعة
Autodeterminación en el Caribe: el caso del Archipiélago de San Andrés, Providencia y Santa Catalina
No full textResumen: El derecho a la Autodeterminación de los Pueblos tiene varios niveles de apropiación, el primer nivel se encuentra consignado en la Carta de las Naciones Unidas aunados a la Resoluciones 1514-XV y 1541-XV de 1960 “Declaración sobre la concesión de la independencia a los países y pueblos coloniales” y 1654-XVI de 1961, que creó el Comité de Descolonización y mediante esta apropiación lograron la independencia la mayor parte de los Estados insulares del Caribe. En segundo lugar, la apropiación consagrada en el Convenio 169 de la OIT de 1989 sobre el derecho a la Autodeterminación de los pueblos indígenas y tribales en países independientes, es asumida por los pueblos no coloniales dentro de las fronteras de los Estados, propiamente los pueblos del Caribe centroamericano. De los debates históricos y reivindicaciones del derecho a la Autodeterminación en el Archipiélago de San Andrés, Providencia y Santa Catalina, en especial del pueblo Raizal, se obtiene que existen elementos de apropiación de los dos niveles referidos y de niveles intermedios que son analizados en esta disertación.Abstract: The Right to Self-Determination of Peoples has several levels of ownership, the first level is enshrined in the Charter of the United Nations resolutions combined with the 1514-XV and 1541-XV of 1960 "Declaration on the Granting of Independence to Colonial Countries and Peoples "and 1654-XVI of 1961, which created the Decolonization Committee and through this appropriation most of the Caribbean islands achieved independence. Second, the ownership enshrined in ILO Convention 169 of 1989 on the Right to Self-Determination of Indigenous and Tribal Peoples in Independent Countries, is assumed by non-colonial peoples within the borders of states, most of all in the Caribbean Coast of Central America. From historical debates and claims of the right to self-determination in the Archipelago of San Andres, Providencia and Santa Catalina, specially the Raizal people, we find that there are elements of ownership of two referenced levels and of intermediate levels are analyzed in this dissertation.Maestrí
USING LINEAR MATRIX INEQUALITY METHOD TO DESIGN MINIMUM-LENGHT FINITE IMPULSE RESPONSE LOOP FILTERS IN FIXED WiMAX PLL
No full textWe designed Finite Impulse Response (FIR), digital filters by Semi-Definite Programming (SDP) using SeDuMi (self-dual minimization) toolbox software. The stability is assured using Linear Matrix Inequality (LMI) constraints. The minimum length FIR filter algorithm was used to proof that the order of the FIR filter, which was designed, is optimal for our design specifications. The proposed method gave better result with regard to all specifications of control signal, where we had the faster system and more stable than the other systems
دراسة مسحية لاستخدام الطاقة الشمسية في المنزل من قبل العاملين في مجمع الشفاء الطبي في قطاع غزة
No full textProviding residences of Gaza with electric power for 24 hours/day is one of the keyproblemsthat facing decision-making bodies in energy sector. Most recently, residence in Gaza started to adopt solar energy system as a replacement or as a complementary to the current energy sources.In this paper, we present a survey results that measures the success of using solar energy at homes in Gaza Strip.The study population is the employees of Al-Shifa Medical Complex (about 2000 employees). The questionnaires are distributed to a sample of 10% of the total population. Collected data isanalyzed using SPSS. Results show that gender and job titles have no effect of the decision of adopting solar energy systems. However, income has a direct effect on the decision of adopting solar energy systemsProviding residences of Gaza with electric power for 24 hours/day is one of the keyproblemsthat facing decision-making bodies in energy sector. Most recently, residence in Gaza started to adopt solar energy system as a replacement or as a complementary to the current energy sources.In this paper, we present a survey results that measures the success of using solar energy at homes in Gaza Strip.The study population is the employees of Al-Shifa Medical Complex (about 2000 employees). The questionnaires are distributed to a sample of 10% of the total population. Collected data isanalyzed using SPSS. Results show that gender and job titles have no effect of the decision of adopting solar energy systems. However, income has a direct effect on the decision of adopting solar energy system
تحسين اداء الشبكات الضوئية الخاملة متعددة الاطوال الموجية
No full textPassive Optical Network (PON) introduces a good data transmission rate and large bandwidth. We have demonstrated a bidirectional PON system based on a Fabry-Perot laser diode (FP-LD) with two cascaded array waveguide gratings (AWGs). The downstream data rate equals to 10 Gbps and the upstream data rate equals to 2.5 Gbps. This network is classified to 10GPON Standard. FP-LD is used at optical network unit (ONU) as transmitter so it can re-modulate the downstream signal with upstream data, and then re-sent upstream towards the central office (CO). FP-LD is considered as low cost optical source, it is less costly than other sources like distributed feedback (DFB) laser, vertical cavity surface emitting lasers (VCSELs) and reflective semiconductor optical amplifier (RSOA). The main idea for using AWGs in the system is to increase the capacity, security and privacy. AWGs are used to multiplex and demultiplex different wavelengths in wavelength division multiplexing PON (WDM-PON). Our proposed systems is effective low cost system and the injection locked FP-LD is used as low cost colorless transmitters for high speed optical access exploiting WDM technology
Filling in the gaps: Anticipatory control of eye movements in chronic mild traumatic brain injury
No full textA barrier in the diagnosis of mild traumatic brain injury (mTBI) stems from the lack of measures that are adequately sensitive in detecting mild head injuries. MRI and CT are typically negative in mTBI patients with persistent symptoms of post-concussive syndrome (PCS), and characteristic difficulties in sustaining attention often go undetected on neuropsychological testing, which can be insensitive to momentary lapses in concentration. Conversely, visual tracking strongly depends on sustained attention over time and is impaired in chronic mTBI patients, especially when tracking an occluded target. This finding suggests deficient internal anticipatory control in mTBI, the neural underpinnings of which are poorly understood. The present study investigated the neuronal bases for deficient anticipatory control during visual tracking in 25 chronic mTBI patients with persistent PCS symptoms and 25 healthy control subjects. The task was performed while undergoing magnetoencephalography (MEG), which allowed us to examine whether neural dysfunction associated with anticipatory control deficits was due to altered alpha, beta, and/or gamma activity. Neuropsychological examinations characterized cognition in both groups. During MEG recordings, subjects tracked a predictably moving target that was either continuously visible or randomly occluded (gap condition). MEG source-imaging analyses tested for group differences in alpha, beta, and gamma frequency bands. The results showed executive functioning, information processing speed, and verbal memory deficits in the mTBI group. Visual tracking was impaired in the mTBI group only in the gap condition. Patients showed greater error than controls before and during target occlusion, and were slower to resynchronize with the target when it reappeared. Impaired tracking concurred with abnormal beta activity, which was suppressed in the parietal cortex, especially the right hemisphere, and enhanced in left caudate and frontal–temporal areas. Regional beta-amplitude demonstrated high classification accuracy (92%) compared to eye-tracking (65%) and neuropsychological variables (80%). These findings show that deficient internal anticipatory control in mTBI is associated with altered beta activity, which is remarkably sensitive given the heterogeneity of injuries
استخدام الانظمة المتسقة في تقسيم الترددات المتعامدة في انظمة الاتصالات الضوئية
No full textOrthogonal frequency division multiplexing (OFDM) has quickly gained its attraction in optical communications that are evolving towards software-enhanced optical transmissions. Coherent optical OFDM (CO-OFDM) takes advantage of software capabilities of electronic digital signal processing (DSP) to perform sophisticated operations and has demonstrated its easiness of realizing high spectral efficiency and combating various distortions at the same time. Coherent optical OFDM (CO-OFDM) has attracted lots of interest due to its high spectral efficiency (SE) and robustness to fiber dispersion and is considered as a promising candidate for long haul optical fiber transmission systems. In the beginning of this study, we will focus in (OFDM) theoretically with basic initial concepts, then a theoretical study of (CO-OFDM) and Direct detection (DD-OFDM) systems in deep with comparing between them, and identifying the advantages and disadvantages for both systems. Next, a practical study for the previous systems, by using (Optisystem), a special simulation program to simulate and analyze the system. This simulation we will simulate (CO-OFDM) for long-haul transmissions with its analysis such as optical signal to noise ratio (OSNR), RF spectrum, and constellation diagrams .In addition, we will simulate (DD-OFDM) with the same previous parameters and compare between the two systems .Then, we will compare (CO-OFDM) with dispersion compensating fiber (DCF) as a treatment to increase the transmission distance. Finally, we will integrate the wavelength division multiplexing system (WDM) with (CO-OFDM) system, to increase the system performance and achieve high data rates
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