The chemical effect of ultrasound on cyanide solutions

An experimental study was undertaken to investigate the chemical effects of high intensity ultrasonic radiation on cyanide solutions. The effects of aeration, concentration of cyanide and temperatures on the reaction rate are investigated. The experiment was preformed in a 30 mm pyrex tube immersed at a fixed height in a constant volume water bath. Ultrasonic energy was applied through the use of a transducer epoxied at the bottom of the water bath. The power inputs to the transducer were 40W (27KHz) and 100W (21KHz). At a power of 40W, ultrasound had no chemical effect on cyanide solutions. At 100W, hydrogen peroxide formed during the process and reacted with the cyanide. The mechanism of reaction is assumed to include both oxidation and hydrolysis of the cyanide in solution. However, the catalytic effect of hydrogen peroxide under these (conditions increased leading to substantial hydrolysis of cyanide. As a result, the overall reaction yield increased by, 200 - 300% over the yield normally obtained from equal amounts of hydrogen per oxide in conventional cyanide - peroxide reactions

Passenger ship stability and fire safety

When I started writing my project about Chapter I, ll-I and 11-2 of SOLAS 74 as amended, I was confused about what to mention and discuss in my thesis due to the extent and the difficulties of the chapters. Finally I confined myself to the provisions concerning surveys to which passenger ships are subject. The project describes the minimum knowledge which a surveyor should have in order to carry out the surveys specified in the international provisions and regulations. This paper is an attempt to produce a booklet for surveyors. I have to remind the reader that this work is limited to Chapter 1,11-1,11-2 with the hope that this booklet will be completed by the future MSA students of the World Maritime University

The Effective Aerodynamic Forces on the Blade and the Rotor of the Wind Turbine

Betz theory presents the output power from the disk of wind turbine but the density of the power on the disk (the density of the forces along the blade) isn't cleared. Designing the profile of a wind turbine blade involves determining the aerodynamics and distribution of the lift forces along the blade. There is new method to calculate the relative velocity depending on knowing values ? Wake rotational speed and ? Blade rotational speed [3], by this method the relative velocity will be known and the lift force will be known theoretically so knowing the efficient lift at particular parts of the blade will help engineers to develop design solutions for improving wind turbine output. This paper studies the distribution of relative velocity and the lift forces along the blade, this values will be calculated depended on several values of the tip speed ratio (TSR) for every situation

Study of the Role of ZOOM Platform in Collaborative Learning from the Perspective of the Kabul University Lecturers

This paper examines the different qualities of the Zoom platform with a focus on its advantages and disadvantages in a collaborative learning style from Kabul University’s lecturers’ perspective. The study explored the role of both humans and technology in shaping the higher education system. The descriptive methodology is used to collect data through a questionnaire with sixteen questions. The statistical population is Kabul University, and the target population is the professors of Journalism, Computer Science, Psychology, Social Sciences and Agriculture faculties who were selected by cluster sampling method. The findings of this research indicate that the majority of the participants of this study believe that the use of Zoom can facilitate the process of collaborative learning and can increase the interaction between students and professors. Participants of this study considered sharing in discussions easily and cheaply as one of the noteworthy advantages of Zoom technology

Evaluation of Cerebral Hemodynamics in Cirrhotic Patients by Transcranial Doppler Ultrasonography and its Relation to Hepatic Encephalopathy

The study aimed at Aim evaluation the cerebral hemodynamics in cirrhotic patients by transcranial Doppler ultrasonography and its relation to hepatic encephalopathy. This study is a prospective study , 50 subjects attended El Hussein university hospital, inpatient and outpatient clinic are classified into three groups, group I(10 subjects as a healthy control),group II (20 subjects with liver cirrhosis without hepatic encephalopathy) and group III(20 subjects with liver cirrhosis with hepatic encephalopathy). All patients included in the study underwent a full history taking,complete physical examination, liver functions tests,blood ammonia level,C.B.C,blood urea and serum creatinine and pelvi-abdominal ultarasonography. Transcranial Doppler done for all patients participated in the study using a 2 MHz transducer. The results showed that as regard Trans cranial Doppler ultrasound parameters, we found a statistical significant difference between the three groups as regard Pulsatility Index (P ˂ 0.001), Breath-Holding Index (P ˂ 0.001) ) , Maximum Flow Velocity(P ˂ 0.001) and Mean (P ˂ 0.001), whereas Pulsatility Index, , Maximum Flow Velocity and Mean are higher in patient with Hepatic Encephalopathy, but Breath-holding index is low, there is no statistical significant difference (P > 0.05) between them as regard Minimum Flow Velocity. Conclusion: Transcranial doppler ultrasonography is easy, rapidly done not invasive method for evaluation of cerebral hemodynamic in cirrhotic patient and predection of hepatic encephalopathy. Keywords: Transcranial doppler, Hepatic encephalopathy, Cirrhosis

Molecular diagnosis in recessive pediatric neurogenetic disease can help reduce disease recurrence in families.

BackgroundThe causes for thousands of individually rare recessive diseases have been discovered since the adoption of next generation sequencing (NGS). Following the molecular diagnosis in older children in a family, parents could use this information to opt for fetal genotyping in subsequent pregnancies, which could inform decisions about elective termination of pregnancy. The use of NGS diagnostic sequencing in families has not been demonstrated to yield benefit in subsequent pregnancies to reduce recurrence. Here we evaluated whether genetic diagnosis in older children in families supports reduction in recurrence of recessive neurogenetic disease.MethodsRetrospective study involving families with a child with a recessive pediatric brain disease (rPBD) that underwent NGS-based molecular diagnosis. Prenatal molecular testing was offered to couples in which a molecular diagnosis was made, to help couples seeking to prevent recurrence. With this information, families made decisions about elective termination. Pregnancies that were carried to term were assessed for the health of child and mother, and compared with historic recurrence risk of recessive disease.ResultsBetween 2010 and 2016, 1172 families presented with a child a likely rPBD, 526 families received a molecular diagnosis, 91 families returned to the clinic with 101 subsequent pregnancies, and 84 opted for fetal genotyping. Sixty tested negative for recurrence for the biallelic mutation in the fetus, and all, except for one spontaneous abortion, carried to term, and were unaffected at follow-up. Of 24 that genotyped positive for the biallelic mutation, 16 were electively terminated, and 8 were carried to term and showed features of disease similar to that of the older affected sibling(s). Among the 101 pregnancies, disease recurrence in living offspring deviated from the expected 25% to the observed 12% ([95% CI 0·04 to 0·20], p = 0·011).ConclusionsMolecular diagnosis in an older child, coupled with prenatal fetal genotyping in subsequent pregnancies and genetic counselling, allows families to make informed decisions to reduce recessive neurogenetic disease recurrence

An integrative comparative study between ultrasound-guided regional anesthesia versus parenteral opioids alone for analgesia in emergency department patients with hip fractures: A systematic review and meta-analysis

BackgroundEmergency physicians play a major role in managing patients with hip fractures. The most commonly used pain management option is parenteral opioids. However, parenteral opioids are subjected to several adverse effects. New pain management techniques such as regional anesthesia are used as alternatives to parenteral opioids. Anatomical landmarks were used to administer regional anesthesia; however, ultrasound guidance has shown promising results with regional anesthesia. Objectiveof the Review: The present study compares the efficacy of ultrasound-guided regional anesthesia (USGRA) to parenteral opioids in analgesia of hip fractures patients. MethodsA literature search for original and relevant articles carried out through six electronic databases, yielded 710 articles which were then assessed using the eligibility criteria resulting in 8 studies eligible for inclusion. ResultsA Meta-analysis of the seven studies showed that ultrasound-guided femoral nerve block was more effective than parenteral opioids in relieving pain. Similarly, meta-analysis of data from two studies shows that US-guided FICB significantly reduced pain scores than parenteral opioids. A subgroup analysis of adverse events showed no significant difference in nausea/vomiting and respiratory complications. However, a subgroup analysis on hypotension showed that the incidence of hypotension was significantly lower in USGRA than parenteral opioids. The present study also revealed that patients in the USGRA group required less frequent rescue analgesia than the patients in the parenteral opioids group. ConclusionResults of the present study show that USGRA is superior to parenteral opioids in reducing pain and the need for rescue analgesia in patients with hip fractures.The publication of this article is funded by the Qatar National Library

Feasibility Study of a Low Cost Saltwater Lamp for Rural Area

Renewable energy is energy generated from natural resources and cannot be depleted. Solar energy is the fastest growing source of renewable energy but the high installation and maintenance cost of a solar system has restrained the consumers from adopting this technology at their home or commercial building. This is especially true for those in developing countries. A new promising renewable energy source known as saltwater energy that takes advantage of the conductive nature of salt water to generate electricity, has intrigued many people. A study has been conducted to develop and produce saltwater-powered devices especially for rural and remote communities in Malaysia as well as worldwide. To main objective of this study is to determine the factors that affect the performance of the saltwater energy generation such as electrode’s combinations, number of cells and the durability of the electrodes. It was found that the choice of electrodes as anode and cathode does affect the voltage output. However, due to the small power produce, the number of cells must be increased to produce enough power to light up a led light and to provide power to USB port. This paper also conducted a cost analysis of using the saltwater lamp and compared it with a solar system. Although the difference in the cost per hour is very small, there are a number of disadvantages of solar system that need to be aware of. The findings obtained from these experiments will be used to design a prototype of the illumination technology for further product development

Comparative Study: PRP Enhanced Fat Graft Versus Fat Graft Alone in Treatment of Postacne Scars with Clinical and Histopathological Eyes

Fat grafting has a role in rejuvenation owing to its mesenchymal cell precursor content especially with growth factors added. Platelet Rich Plasma (PRP) is known for its high growth factor content. The objective of this study is to compare the effect of PRP when added to fat graft in acne scars. 28 patients were randomly divided into 2 groups. Group A was treated with fat grafting while group B was treated with PRP enhanced fat grafting. All patients received a single treatment session. Assessment was conducted by comparing digital photos and biopsies before and after 6 months of treatment. The results shows that acne scars improved with PRP enhanced fat graft (93%) more than fat graft (64%). The biopsy results also confirmed the significantly better improvement for PRP group (85.7%) than the fat graft group (58%) (p=0.042). PRP has provided an enhancement of fat grafting in treatment of post acne scars. Icepick scars were better treated by fat grafting alone, while rolling and boxcars showed better results with the addition of PRP

Optimal distributed generation in green building assessment towards line loss reduction for Malaysian public hospital

This paper presents an optimization approach for criteria setting of Renewable Distributed Generation (DG) in the Green Building Rating System (GBRS). In this study, the total line loss reduction is analyzed and set as the main objective function in the optimization process which then a reassessment of existing criteria setting for renewable energy (RE) is proposed towards lower loss outcome. Solar photovoltaic (PV)-type DG unit (PV-DG) is identified as the type of DG used in this paper. The proposed PV-DG optimization will improve the sustainable energy performance of the green building by total line losses reduction within accepted lower losses region using Artificial bee colony (ABC) algorithm. The distribution network uses bus and line data setup from selected one of each three levels of Malaysian public hospital. MATLAB simulation result shows that the PV-DG expanding capacity towards optimal scale and location provides a better outcome in minimizing total line losses within an appropriate voltage profile as compared to the current setting of PV-DG imposed in selected GBRS. Thus, reassessment of RE parameter setting and the proposed five rankings with new PV-DG setting for public hospital provides technical justification and give the best option to the green building developer for more effective RE integration