Hydrogen Production by Hybrid photovoltaic Thermal System

Hydrogen fuel is a good alternative to fossil fuels. It can be produced using a clean energy without contaminated emissions. This work is concerned with experimental study on hydrogen production via solar energy. Hybrid photovoltaic thermal system (PV/T) is used to convert solar radiation to electrical and thermal energy. The electrical energy  is used to analyze water into hydrogen and oxygen by using alkaline water electrolyzer with stainless steel electrodes. The absorbed  thermal energy is used to heat  circulating water inside the  copper serpentine pipe fixed on  the  back surface of the PV panel. A perforated pipe connected on the upper edge of PV panel is used  to  spray  a thin layer of water on  the  PV panel surface for auxiliary cooling and improve the generated electrical power. The hydrogen production system is tested at different temperature of electrolysis water (40, 45, 50, 55, 60)˚C. The experimental results show that the PV module electrical efficiency is improved by (14.31)%. while the power generated was enhanced by (3.94 to 15.40)%. The maximum hydrogen production rate is 153.3 ml/min, the efficiency of the system is 20.88% and the total amount of hydrogen produced in one day is 220.752 liter

Intracisternal papaverine toxicity in anterior circulation aneurysm clipping surgery: A literature review

Introduction. Cerebral vasospasm is a major cause of mortality in patients with subarachnoid haemorrhage. Irrigation of intracisternal papaverine has been adopted as a strategy to reduce the incidence of aneurysm-surgery-associated vasospasm. Aim. The aim of this literature review is to summarize the reported complications associated with intracisternal papaverine administration. Patients and Methods. We searched the following databases: PubMed, Google Scholar, Cochrane Library, Clinical Key, Embase, Emerald, Health Business Elite, MEDLINE at OVID, EBM Reviews and Research Gate. The following keywords were used: Intracisternal papaverine, topical papaverine, direct papaverine, a vasodilator for aneurysm surgery, papaverine in aneurysm clipping, papaverine complications and papaverine side effects. The search criteria included all articles published between 1980-2019, in the English language. Results. Our search yielded a total of 19 articles describing 43 cases. The most common reported complication was ipsilateral oculomotor nerve palsy. Other local complications included: Bilateral oculomotor nerve palsy, ipsilateral facial nerve palsy, and monocular blindness. Although less common, reports pointing to papaverine systemic toxicity did exist. Examples of such complications included: Profound hypotension, bradycardia, hypertension and tachycardia, hyperthermia and metabolic acidosis, cardiac arrest and even death. Conclusion. Intracisternal papaverine irrigation is an effective strategy in reducing peri-operative vasospasm associated with aneurysm surgery. Although uncommon, both local and systemic side effects have been linked to papaverine use, calling for careful dosing and close monitoring to enhance its safety profile

Hypotension and Bradycardia Following Papaverine Installation During Intracranial Aneurysm Surgery: A Report of Three Cases

Introduction One of the major complications of intracranial aneurysm surgery is vasospasm. Papaverine is an effective vasodilator that can be instilled directly onto the vessels in the operative field with the aim of preventing intraoperative and postoperative vasospasm. Several case reports of hemodynamic instability in general and of hypotension, in particular, were reported after the use of topical papaverine during aneurysm clipping surgery

Spontaneous intracerebral haemorrhage as an initial presentation of a choriocarcinoma: A case report

Introduction: Choriocarcinoma is a rare gestational trophoblastic neoplasm with a high risk of pulmonary, hepatic, and, rarely, cerebral metastasis. We report a rare case of intracerebral haemorrhage as an initial manifestation of metastatic choriocarcinoma.  Case presentation: A 33-year-old female with a history of multiple abortions, ectopic pregnancy, and complete hydatidiform mole presented with a disturbed level of consciousness. Emergency brain computed tomography (CT) scan revealed an intraventricular haemorrhage (IVH) and a left frontoparietal, non-traumatic intracerebral haemorrhage (ICH) with a significant midline shift. The patient underwent emergency evacuation of the hematoma and histological evaluation revealed choriocarcinoma. Later investigations revealed evidence of systemic metastasis. The patient underwent chemoradiotherapy and recovered well.  Conclusion: Metastatic choriocarcinoma should always be in the differential of non-traumatic intracerebral haemorrhage in a female child-bearing age. Also, the pathological diagnosis should always be performed in cases of ICH of an unknown source.        &nbsp

Comprehensive review of data exchange in vehicle-to-pedestrian communications: State of the art

Pedestrian safety is a serious problem in transportation systems because pedestrian and vehicle crashes often result in fatalities amongst vulnerable road users. A vehicle-to-pedestrian (V2P) communication system allows data exchange between pedestrians and vehicles to prevent or minimise potential dangers of accidents from happening. This work aimed to analyse and review the previous work associated with information exchange in the V2P communication system and classify the existing technology utilized for this purpose. Motivation, accessible problems confronting researchers, and suggestions posed to researchers to develop this critical area of study have been among the reasons considered to enhance awareness of the field's numerous qualitative facets in reported investigations and properties. All of the papers have been divided into four categories: growth, analysis, and survey, FRAMEWORK, and data exchange in the V2P communication system. V2P communication is an area that necessitates automated solutions, instruments, and techniques that allow pedestrian detection and prediction. Pedestrian identification and data sharing on V2P have been the subject of several experiments in order to support pedestrian protection techniques. The reasons, open barriers that hinder the technology's usefulness, and authors' suggestions have been used to identify the essential characteristics of this evolving sector. This study is intended to provide researchers with new resources and enable them to focus on the holes that have been found

Posterior auricular artery

Introduction: The posterior auricular artery (PAA) is the preterminal branch of the external carotid artery (ECA), arising superiorly to the occipital artery (OA). The PAA has quite a few anatomical variations and established neurosurgical applications. We conducted this study as an overview to illustrate all neurosurgical aspects regarding this artery, its reconstructive uses, and anatomical variation. Method:  We performed a literature review in Google Scholar and PubMed medical databases for studies discussing the PAA, its anatomical variations, and neurosurgical applications. Results: We identified 30 articles that discuss the anatomical variations and neurosurgical applications of the PAA. While reviewing the available articles and original works regarding PAA. Conclusion: The PAA has considerable anatomical variations regarding its origin, course, branches, and length. The related neurosurgical applications of PAA include bypass, embolization, aneurysm, AVM, and reconstruction flaps

Deep motor cortex cavernoma resection supported by navigational intraoperative monitoring: A case report

Introduction: Cavernomas are benign hamartomas of cerebral and spinal vessels, accounting for less than 1% of all arteriovenous malformations. In general, surgical resection is the treatment of choice for enlarging cavernomas or those associated with medically refractory seizures. Herein, we report a case of an enlarged deep precentral gyrus cavernoma, with a discussion of the surgical approach and the impact of intra-operative neurophysiological monitoring on the preservation of motor function. Case description: A 30-year-old male was referred to our hospital due to 2-month history of focal seizures. Initial magnetic resonance imaging revealed right precentral cavernoma with minimal right parietal subarachnoid haemorrhage. Revealed the location of the cavernoma deep in the right primary motor cortex. Surgery was performed, trans-sulcal dissection was done with the aid of intraoperative ultrasonography neuro-navigation. The cortical motor map was localized by functional mapping with intra-operative neurophysiological monitoring, including somatosensory evoked potentials (SEP) and motor evoked potentials (MEP). Post-operatively, the left side weakness grade was 4/5, and the Glasgow coma scale was 15. Postoperative imaging confirmed successful resection of the cavernoma and associated hemosiderin ring with no SAH. Conclusion: The use of preoperative MRI and intraoperative ultrasonography supplemented by neurophysiological monitoring utilizing SEP, MEP, and cortical mapping is essential for the safe resection of paracentral cavernomas

Management of brain aneurysm neck-avulsion during clipping surgery: Illustrative case and literature review

Background. Intra-operative rupture (IOR) of intracranial aneurysms is a critical event affecting the operation course and the patient’s outcome. However, A rupture induced by an avulsion in the aneurysmal neck is exceedingly challenging, as sealing the neck tear by clip application might result in ischemic injury due to parent vessel occlusion. Here we reviewed the literature regarding the intraoperative avulsion of the aneurysmal neck with an illustrative case to provide explanations of its surgical management intricacies. Methods. A Midline PubMed literature review was performed using the following keywords; (Aneurysm) AND (neck) AND (surgery or clipping) AND (tear OR avulsion). Fifty-three results were found initially. After excluding non-human subject studies, and non-English studies, two independent researchers examined the title and the abstract for the cases of neck tear or avulsion with its management. Results. Fourteen articles were found to be included in this study. The average age of the cases is around 57 years. The percentages of females in the review were 62% (8/13), and among the males, 38% (5/13). Regarding the locations, PcomA and AcomA were both 23% (3/13) of the cases; other locations include ACA, 15%, and MCA, 15%. The surgical techniques that opted from the literature include the cotton clip method, clip wrapping, parallel clipping and micro-suturing Conclusion. IOR due to aneurysmal neck avulsion is a devastating surgical complication, and its management may differ according to the extent of the rupture. Choosing the most convenient technique depends on the surgeon’s knowledge and experience

Management of brain aneurysm neck-avulsion during clipping surgery

Background. Intra-operative rupture (IOR) of intracranial aneurysms is a critical event affecting the operation course and the patient’s outcome. However, A rupture induced by an avulsion in the aneurysmal neck is exceedingly challenging, as sealing the neck tear by clip application might result in ischemic injury due to parent vessel occlusion. Here we reviewed the literature regarding the intraoperative avulsion of the aneurysmal neck with an illustrative case to provide explanations of its surgical management intricacies. Methods. A Midline PubMed literature review was performed using the following keywords; (Aneurysm) AND (neck) AND (surgery or clipping) AND (tear OR avulsion). Fifty-three results were found initially. After excluding non-human subject studies, and non-English studies, two independent researchers examined the title and the abstract for the cases of neck tear or avulsion with its management. Results. Fourteen articles were found to be included in this study. The average age of the cases is around 57 years. The percentages of females in the review were 62% (8/13), and among the males, 38% (5/13). Regarding the locations, PcomA and AcomA were both 23% (3/13) of the cases; other locations include ACA, 15%, and MCA, 15%. The surgical techniques that opted from the literature include the cotton clip method, clip wrapping, parallel clipping and micro-suturing Conclusion. IOR due to aneurysmal neck avulsion is a devastating surgical complication, and its management may differ according to the extent of the rupture. Choosing the most convenient technique depends on the surgeon’s knowledge and experience

Produced Water Treatment Using Ultrafiltration and Nanofiltration Membranes

The application of ultrafiltration (UF) and nanofiltration (NF) processes in the handling of raw produced water have been investigated in the present study. Experiments of both ultrafiltration and nanofiltration processes are performed in a laboratory unit, which is operated in a cross-flow pattern. Various types of hollow fiber membranes were utilized in this study such as poly vinyl chloride (PVC) UF membrane, two different polyether sulfone (PES) NF membranes, and poly phenyl sulfone PPSU NF membrane. It was found that the turbidity of the treated water is higher than 95 % by using UF and NF membranes. The chemical oxygen demand COD (160 mg/l) and Oil content (26.8 mg/l) were found after treatment according to the allowable limits set by means of world health organization WHO water quality standards. The final composition of SO4-2 (110 mg/l) and NO3 (48.4 mg/l) components within the produced water after treatment were agreed with the permissible limits of WHO, whereas Cl-1 (8900 mg/l) component is not in the allowable limits. Finally by the use of PVC, PES and PPSU hollow fiber membranes; this method is seen to be not sufficient to remove the salinity of the produced water