scholarly journals Optimal Tilt and Orientation Angles in Fixed Flat Surfaces to Maximize the Capture of Solar Insolation: A Case Study in Ecuador

2021 ◽  
Vol 11 (10) ◽  
pp. 4546
Author(s):  
Xavier Serrano-Guerrero ◽  
Eduardo Cantos ◽  
Juan-Javier Feijoo ◽  
Antonio Barragán-Escandón ◽  
Jean-Michel Clairand
Keyword(s):  
Case Report ◽  
Electrical Power ◽  
Computer Application ◽  
Angle Of Incidence ◽  
The Sun ◽  
Solar Insolation ◽  
Flat Surfaces ◽  
Electrical Power Output ◽  
Pv Generation

Due to the increasing attention of PV generation, and to the uncertainty of the real PV electrical power output, power system are facing planning challenges. Hence, this case report proposes a computer application that determines the optimal tilt and orientation angles of flat surfaces to maximize solar insolation capture based on existing mathematical models. The study uses data from different meteorological variables measured and estimated through a typical year from the most populated Ecuador cities. The computer application considers the global, diffuse, direct, reflected radiation, and the angle of incidence of the sun. This analysis reveals the angle of inclination and orientation where the highest percentage of insolation is obtained in Ecuador’s main cities. The results suggest that, in Ecuador, flat solar capture surfaces can be oriented between 20° and 60° concerning north, and with tilt angles between 12° and 19°. This contrasts with the literature, which recommends an orientation to the equator and an inclination equal to the location’s latitude.

The Effects of Photovoltaic Panel’s Temperature towards Photovoltaic Electrical Power Output

2021 ◽  
Vol 02 (02) ◽  
Author(s):  
Nor Izzati Mohd Salleh ◽  
◽  
Ahmad Fateh Mohamad Nor ◽  
Siti Amely Jumaat ◽  
Jabbar Al-Fattah Yahaya ◽  
...  
Keyword(s):  
Band Gap ◽  
Power Output ◽  
Electrical Power ◽  
Open Circuit ◽  
The Sun ◽  
Pv System ◽  
Pv Systems ◽  
Pv Panel ◽  
Electrical Power Output ◽  
Increasing Temperature

Photovoltaic (PV) system is recognized as one of the most current renewable energy types in producing electrical power. The theories that science explain related to the function of the sun is in accordance with what is also described in the Qur'an. There is one ayah Quran related to the Greatness of Allah and The Mercy which is “And from among His Signs are the night and the day, and the sun and the moon. Prostrate yourselves to Allah Who created them, if you (really) worship Him [Fussilat:37]. However, one of the main issues of PV system is that the performance of the system is highly dependent to environmental conditions such as weather and solar irradiance. Increases in temperature reduce the band gap of a semiconductor. The decrease in the band gap of a semiconductor with increasing temperature can be viewed as increasing the energy of the electrons in the material. The parameter most affected by an increase in temperature is the open circuit voltage. Temperature coefficient indicates how much will be the decrement in power output if PV module. Hence, it is important to predict the actual generating output power of PV systems. This study investigates the relationship between the temperatures of the PV panel with the PV power output. The PV systems installed at the rooftop of Mega label SDN. BHD. with type of poly-crystalline 405.72KWP has been chosen as the reference system in this study. The results have shown that the rise of PV panel’s temperature will make the value of the PV electrical power output decreases.

Misophonia: An Evidence-Based Case Report

2020 ◽  
Vol 29 (4) ◽  
pp. 685-690
Author(s):  
C. S. Vanaja ◽  
Miriam Soni Abigail
Keyword(s):  
Quality Of Life ◽  
Case Report ◽  
Case History ◽  
Pure Tone ◽  
Physiological Responses ◽  
Evidence Based ◽  
Management Option ◽  
Pure Tone Audiogram

Purpose Misophonia is a sound tolerance disorder condition in certain sounds that trigger intense emotional or physiological responses. While some persons may experience misophonia, a few patients suffer from misophonia. However, there is a dearth of literature on audiological assessment and management of persons with misophonia. The purpose of this report is to discuss the assessment of misophonia and highlight the management option that helped a patient with misophonia. Method A case study of a 26-year-old woman with the complaint of decreased tolerance to specific sounds affecting quality of life is reported. Audiological assessment differentiated misophonia from hyperacusis. Management included retraining counseling as well as desensitization and habituation therapy based on the principles described by P. J. Jastreboff and Jastreboff (2014). A misophonia questionnaire was administered at regular intervals to monitor the effectiveness of therapy. Results A detailed case history and audiological evaluations including pure-tone audiogram and Johnson Hyperacusis Index revealed the presence of misophonia. The patient benefitted from intervention, and the scores of the misophonia questionnaire indicated a decrease in the severity of the problem. Conclusions It is important to differentially diagnose misophonia and hyperacusis in persons with sound tolerance disorders. Retraining counseling as well as desensitization and habituation therapy can help patients who suffer from misophonia.

Intensive Stuttering Therapy With Telepractice Follow-up: A Case Study

2011 ◽  
Vol 21 (1) ◽  
pp. 11-21 ◽  
Author(s):  
Farzan Irani ◽  
Rodney Gabel
Keyword(s):  
Case Report ◽  
Therapeutic Intervention ◽  
Intensive Therapy ◽  
Positive Outcome ◽  
Eclectic Approach

This case report describes the positive outcome of a therapeutic intervention that integrated an intensive, residential component with follow-up telepractice for a 21 year old male who stutters. This therapy utilized an eclectic approach to intensive therapy in conjunction with a 12-month follow-up via video telepractice. The results indicated that the client benefited from the program as demonstrated by a reduction in percent stuttered syllables, a reduction in stuttering severity, and a change in attitudes and feelings related to stuttering and speaking.

Sun Load Analysis and Testing on Automotive Front Lighting Products

2020 ◽  
pp. 116-122
Author(s):  
Emre Öztürk ◽  
Mehmet Aktaş ◽  
Tunç Şenyüz
Keyword(s):  
Prolonged Exposure ◽  
Hot Spot ◽  
Load Test ◽  
Angle Of Incidence ◽  
The Sun ◽  
Solar Simulator ◽  
Automotive Lighting ◽  
Inclination Angles ◽  
Plastic Parts ◽  
Load Simulation

The purpose of this research is to reach good correlation between sun load simulation and solar focusing test for exterior automotive lighting products. Light coming from sun is highly collimated (parallel rays) and focusable from lenses with concave structure. Focusing incidence leads to a hot spot on lens surrounding plastic parts which may cause melting failures at high temperature zones. Sun load simulation is performing to eliminate risk of discoloration, deformation, out gassing, coating failures and fire with prolonged exposure from field. Irradiance values in W/m2 defined in simulation as heat source depending of an angle of incidence of the sun radiation. At first step, simulation is performing with 5 degree intervals to define the critical zones then intervals decreased to 2 degree to detect the critical azimuth and inclination angles. Critical azimuth and inclination angles is checking with ray trace analysis to check the bouncing of sun rays and possible solution to eliminate focuses with design solutions. After numerical analysis to release and validate the automotive lighting products regarding the sun load test, measurement with first parts is necessary. Measurement is performing for all critical angles which have been detected at simulation with thermal camera under ultra high-collimation solar simulator. Measured temperatures are settled according to environment conditions and correlation is checking with simulations.

A Pleasing Odour for Yahweh

2018 ◽  
Vol 2 (1) ◽  
pp. 7-24
Author(s):  
Anne Katrine De Hemmer Gudme
Keyword(s):  
Hebrew Bible ◽  
Sacred Space ◽  
Ancient World ◽  
Hellenistic Period ◽  
The Sun ◽  
The West ◽  
Sense Of Smell ◽  
The Temple ◽  
Crucial Part

This article investigates the importance of smell in the sacrificial cults of the ancient Mediterranean, using the Yahweh temple on Mount Gerizim and the Hebrew Bible as a case-study. The material shows that smell was an important factor in delineating sacred space in the ancient world and that the sense of smell was a crucial part of the conceptualization of the meeting between the human and the divine.  In the Hebrew Bible, the temple cult is pervaded by smell. There is the sacred oil laced with spices and aromatics with which the sanctuary and the priests are anointed. There is the fragrant and luxurious incense, which is burnt every day in front of Yahweh and finally there are the sacrifices and offerings that are burnt on the altar as ‘gifts of fire’ and as ‘pleasing odors’ to Yahweh. The gifts that are given to Yahweh are explicitly described as pleasing to the deity’s sense of smell. On Mount Gerizim, which is close to present-day Nablus on the west bank, there once stood a temple dedicated to the god Yahweh, whom we also know from the Hebrew Bible. The temple was in use from the Persian to the Hellenistic period (ca. 450 – 110 BCE) and during this time thousands of animals (mostly goats, sheep, pigeons and cows) were slaughtered and burnt on the altar as gifts to Yahweh. The worshippers who came to the sanctuary – and we know some of them by name because they left inscriptions commemorating their visit to the temple – would have experienced an overwhelming combination of smells: the smell of spicy herbs baked by the sun that is carried by the wind, the smell of humans standing close together and the smell of animals, of dung and blood, and behind it all as a backdrop of scent the constant smell of the sacrificial smoke that rises to the sky.

Hodgkin Disease and Pregnancy - A Case Report

2014 ◽  
Vol 68 (2) ◽  
pp. 104-106
Author(s):  
Aleksandra Pivkova Veljanovska ◽  
Sonja Genadieva Stavrik ◽  
Zlate Stojanoski ◽  
Lazar Cadievski ◽  
Adela Stefanija ◽  
...  
Keyword(s):  
Case Report ◽  
Pregnant Women ◽  
Hodgkin Disease ◽  
Morbidity And Mortality ◽  
Chemotherapy Treatment ◽  
Related Factors ◽  
Hematological Disorder

Abstract The article presents a case with diagnosed Hodgkin disease (HD) during pregnancy. The aim of this case study was to present diagnostic possibilities in determining HD stage during pregnancy and therapeutic dilemmas. The incidence of HD during pregnancy is 3.2% of all cases with this malignant hematological disorder. The treatment of this disease during pregnancy depends on disease-related factors, pregnancy-related factors, as well as possible implications for fetal morbidity and mortality. The need of analysis of the nature of the disease during pregnancy indicates examination of a larger series of pregnant women with HD and the drawn conclusions affect the decision whether chemotherapy treatment should start immediately or it should be postponed for after delivery.

Managament of Bhagandara (Fistula-in-Ano) by Palasha Ksharasutra prepared with Arkaksheera - A Case Report.

2017 ◽  
Vol 2 (1) ◽  
Author(s):  
Ganapathi Rao ◽  
Vijay Kumar ◽  
Ashok Naikar ◽  
Chandrakanth Halli
Keyword(s):  
Quality Of Life ◽  
Case Report ◽  
Success Rate ◽  
Spinal Anesthesia ◽  
Curcuma Longa ◽  
Weekly Interval ◽  
Butea Monosperma ◽  
Fistula In Ano

A standard Ksharasutra is practiced in treatment of Bhagandara (fistula-in-ano) with high success rate and minimum recurrence rate. In previous research it was noted that Pittaja Prakruti patients sometime might cause more perianal irritation due to Apamarga Ksharasutra. So in this study Palasha Ksharasutra prepared in Arkaksheera was prepared by Palasha Kshara (Ash of Butea monosperma), Arka Ksheera (Calotropis gigantic) and turmeric powder (Curcuma longa). This Ksharasutra was prepared as per the API guidelines and preserved in air tight tube. A patient of Pittaja predominant Prakruti with fistula-in ano having two external opening at 6 and 7 O’ clock position of anus was treated with application of Ksharasutra. The Palasha Ksharasutra prepared in Arkaksheera was applied in these two opening under spinal anesthesia. Then Ksharasutra was changed by weekly interval under local xylocaine jelly 2%. The length of thread was measured weekly and noted in the case to assess the unit cutting time (UCT). The unit cutting time (UCT) of first thread was 7.5 days/cm and second one had UCT 6.8 days/cm. During the treatment patient was doing his job regularly without hampering the quality of life. After 2 months patient was free from all symptoms of fistula with normal scar and without any complications. This case study demonstrated the utility of Palasha Ksharasutra prepared in Arkaksheera in multiple fistula-in ano.

scholarly journals Near-field thermophotovoltaics for efficient heat to electricity conversion at high power density

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Rohith Mittapally ◽  
Byungjun Lee ◽  
Linxiao Zhu ◽  
Amin Reihani ◽  
Ju Won Lim ◽  
...  
Keyword(s):  
Power Density ◽  
High Power ◽  
High Efficiency ◽  
Near Field ◽  
Electrical Power ◽  
Photovoltaic Cells ◽  
High Power Density ◽  
Pv Cell ◽  
Electrical Power Output ◽  
Power Densities

AbstractThermophotovoltaic approaches that take advantage of near-field evanescent modes are being actively explored due to their potential for high-power density and high-efficiency energy conversion. However, progress towards functional near-field thermophotovoltaic devices has been limited by challenges in creating thermally robust planar emitters and photovoltaic cells designed for near-field thermal radiation. Here, we demonstrate record power densities of ~5 kW/m2 at an efficiency of 6.8%, where the efficiency of the system is defined as the ratio of the electrical power output of the PV cell to the radiative heat transfer from the emitter to the PV cell. This was accomplished by developing novel emitter devices that can sustain temperatures as high as 1270 K and positioning them into the near-field (<100 nm) of custom-fabricated InGaAs-based thin film photovoltaic cells. In addition to demonstrating efficient heat-to-electricity conversion at high power density, we report the performance of thermophotovoltaic devices across a range of emitter temperatures (~800 K–1270 K) and gap sizes (70 nm–7 µm). The methods and insights achieved in this work represent a critical step towards understanding the fundamental principles of harvesting thermal energy in the near-field.

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