Digital Commons Network^™

Experimental Investigation Of Artificial Cavities Effect Of Single-Phase Fluid Flow And Heat Transfer In Single Microchannel, Qahtan Al-Nakeeb, Ekhlas Fayyadh, Moayed Hasan

Engineering and Technology Journal

In this paper, an experimental study has been conducted to investigate the influence of artificial cavities (artificial nucleation sites, ANS) in a single microchannel on the characteristics of flow and heat transfer at a single-phase flow. The experiments were performed with deionized water as a working fluid at 30OC inlet temperature with a range (108.6-2372) of Reynolds numbers. Three models of the straight microchannel (model-1, model-2, and model-3) were manufactured of brass having a rectangular shape with a hydraulic diameter of (0.42 mm). Model-1 has a smooth surface, while model-2 has artificial cavities with a number of 40 ANS located …

Heat Transfer In Electronic Systems Printed Circuit Board: A Review, Mustafa Kadum, Ahmed Imran, Sattar Aljabair

Engineering and Technology Journal

Thermal regulation has now become a staple in the design of electronic devices. As a result of technological advances in the electronic industry, component miniaturization and thermal system management are becoming more and more important. Due to the high demand for device performance and the need for better thermal management, this paper present a detailed theoretical review of heat transfer by conventional methods in electronic devices and equipment such as air cooling, water cooling, etc. to provide an ideal framework for a practical application in electronic cooling. With reference to the possibility of investing unconventional ways to reduce the energy …

Experimental Exergetic And Energetic Analysis Of Different (Pv) Array Configurations, Dalya Omer, Mahmoud Mahdi, Ahlam Shuraiji

Engineering and Technology Journal

It is well known that photovoltaic (PV) can be connected in parallel, series, and parallel series. In this study, four PV panels are connected in four different ways, i.e., 4panels parallel (4p), 3panels parallel*1panel series (3p*1s), 2panels parallel*2panels parallel (2p*2p) connected in series, and 2panels series *2panels series (2s*2s) connected in parallel, to determine the best PV panels configuration for supplying DC power to the Variable Speed Compressor (VSC) with the highest average exergy efficiency and minimum exergy losses under sunny daylight hours. Experimental data is used to calculate the exergy efficiency of the mentioned configurations. The best results are …

A Comparative Experimental Study Analysis Of Solar Based Thermoelectric Refrigerator Using Different Hot Side Heat Sink, Nora Numan, Mahmmoud Mahdi, Majida Ahmed

Engineering and Technology Journal

The heat sink influences heat dissipation at the hot junction of the Peltier module and, hence, affects the performance of the thermoelectric refrigerator. The present work compares the performance of solar-powered thermoelectric refrigerator units with capacity (30 Liter) for two cases by employing two different heat sink types. In case (I) The Peltier module (12706) is connected with a heat sink type of Hot wall air-cooled (HWAC). In case (II) the Same Peltier is connected with a heat sink type of hot wall air-cooled with a heat exchanger (HWACHE). The exergy analysis method can help to determine the exergy losses …

Manufacturing And Calibration Of Conical Springs Lateral Stiffness Meter, Muhammad Tahir, Shakir Hassan, Jumaa Chiad

Engineering and Technology Journal

The spring is an important mechanical part of which widely used in many industrial applications. There is an urgent need to know its stiffness property before use in any application. Since the stiffness varies according to the method of using the spring in this research, it is suggested to calculate the lateral stiffness of spring by the moment effect. the device meter of the lateral stiffness of conical springs has been designed and manufactured working principle applying a torque to the head of the spring and calculating the angle of inclination. This research includes an experimental aspect (tensile test of …

Design And Implementation Of Remote Real-Time Monitor System For Prosthetic Limbs, Hussein Mansoure, Hadeel Abdullah

Engineering and Technology Journal

Persons with Lower-limb amputations experience movement restrictions resulting in worsening their life quality. Wearable sensors are often utilized to evaluate spatial and temporal qualities and kinetic parameters that provide the mechanism to create interactive monitoring of the amputee prosthesis system. Gait events and detection of the gait phase of amputee movement are essential to control the prosthetic devices of lower limbs.  This paper presents real-time monitoring to individuals with lower limb amputation by using a medical wireless sensor. However,  the proposed system used four medical sensor nodes (such as gait, temperature, the pressure of blood, blood oxygenation (SpO2) )for transmitted …

Flow Improvement And Viscosity Reduction For Crude Oil Pipelines Transportation Using Dilution And Electrical Field, Noor Jalal, Raheek Ibrahim, Manal Oudah

Engineering and Technology Journal

One of the great challenges in pipeline transportation of heavy crude oil is the effect of viscosity on flow rate. By using viscosity reduction techniques, crude oil flow ability can be enhanced. However, the dual effect of dilution and electric fields on crude oil flow ability is still not well addressed. The main goal of this study is to reduce viscosity and improve the flow rate of heavy crude oil through pipelines using dual techniques of electrical field and dilution. The optimization technique was used to investigate the interaction effects of experimental variables on the objective function. As compared to …

Optimization Process For Biodiesel Production From Waste Cooking Of Vegetable Oil By Microwave Irradiation, Raheek Ibrahim, Ahmed Reja, Abeer Kadhim

Engineering and Technology Journal

Biodiesel is the main alternative to diesel fuel today. The waste cooking vegetable oil can be used as a basic material in its preparation. Microwave irradiation is used in its production and it is considered one of the effective methods that do not consume much power. In this study, biodiesel is produce and determine the factors affecting the quality and quantity of production also investigated using experimental design technique. The effecting of operating variables power, time, and oil-to-ethanol molar ratio were studied, as well as the effect of interaction between operating variables on the quality of production. The optimum conditions …

Design And Implementation Of An Electromechanical Brake System, Haider Faisal, Farag Mohammed, Jamal Mohammed

Engineering and Technology Journal

Nowadays, hydraulic brakes are already being replaced by electromechanical brakes (EMB) to improve quick-response brakes, efficient fuel consumption, environmentally sound, simple maintenance, and enhanced safety design. It is suggested that the electromechanical brake will be one of the most important brake systems in the future. This study focuses on designing and implementing an electromechanical brake based on a brushless DC (BLDC) motor and position controller to generate and control the required braking force at a variable friction coefficient between disc and pad. A feedback controller equipped with a measuring sensor is usually utilized to control this type of brake. Thus, …

The Combining Effect Of Inclination Angle, Aspect Ratio And Thermal Loading On The Dynamic Response Of Clamped-Clamped Pipe Conveying Fluid, Jabbar Mohmmed, Mauwafak Tawfik, Qasim Atiyah

Engineering and Technology Journal

The investigation of the vibration of pipes containing flowing fluid is very essential to obtain an understanding of their dynamic behavior and prevent their catastrophic failure due to fatigue. Pipelines are subjected to environmental static and dynamic loading including self-weight, restoring, and Carioles forces. This research aims to investigate the vibrations of pipeline structures for examining their structural integrity under these conditions. A linear Euler-Bernoulli beam model is used to analyze the dynamic response of flexible, inclined, and fixed ends pipe conveying fluid made of polypropylene random-copolymer. Closed-form expression for dynamic response is presented by using combining of finite Fourier …

Corn Oil Performance’S A Bio Cooling Fluid In Electric Distribution Transformer, Ahmed Khudhair, Mohammed Jabal, Samar Ismail

Engineering and Technology Journal

Biodegradable (Vegetable) fluids are considered as environmentally friendly fluids and possess an abundant benefit, they are wildly available by means of renewable sources compared to different kinds of mineral-oil.  Given the occurrence of environmental pollution and health problems from mineral oils.  This paper investigates the effect of utilizing the corn oil for the cooling performing features of distribution electric transformer, and making a comparison with the cooling performance of the electric transformer whith cooling by the commercial mineral fluid. This investigation is done by using the four- ball machine and electric transformers. Each experiment that was executed complies with ASTM …

Elevated Temperature Corrosion Of Mechanical Properties And Fatigue Life Of 7025 Aluminum Alloy, Mohammed Alwan, Hussain Al-Alkawi, Ghada Aziz

Engineering and Technology Journal

Aluminum alloys are widely used in aircraft industry where good corrosion resistance, light weight and high strength are the primary requirements. In the present study, attempts have been made to extend the application of mechanical and fatigue properties of AA7025 in laboratory with corrosive environment of media and combined corrosive at elevated temperature (ET) 150⁰C. The experimental results and analysis of corrosion and corrosion - elevated temperature mechanical and fatigue behavior of the samples showed that the 3.5%NaCl corrosive media and corrosion - elevated temperature (ET) greatly decrease the properties mentioned. The Ultimate Tensile Strength (UTS) and Yield stress YS …

Thermal Performance Of An Evacuated-Tube Solar Collector Using Nanofluids And An Electrical Curtain Controlled By An Artificial Intelligence Technique, Hussam Rashid, Khalid Sultan, Hosham Anead

Engineering and Technology Journal

This paper studies the improvement of an evacuated tube solar collectors(ETSCs) performance in two way. The first is by adding a finned electronic curtain in front of the solar collector. While the second is by using a nanofluid instead of pure water. The purpose of the curtain is to increase the amount of solar radiation reflected toward the collector. The curtain is distinguished by its self-ability to track the sun's rays automatically. The electronic curtain is also closed to shade the tubes depending on the movement of the electronic curtain's fins and the nanofluid's temperatures. MATLAB algorithm has been used …

Mitigating Uas Airspace Risks Through Policy Innovation, Christopher Daniel Sidor

Student Research Symposium (SRS)

Uncrewed Aircraft Systems (UAS), commonly known as drones, have become an everyday part of our lives. Once a technology reserved for the defense industry, UAS are now widely available and affordable in the commercial market. These systems have been used for intelligence, surveillance, and reconnaissance (ISR) missions, route mapping, and kinetic deployment of munitions. In modern warfare, drones have been at the forefront, leveraging new tactics, techniques, and procedures to enhance lethality and destruction. The integration of fiber-optic (FO) connected drones, first-person view (FPV) technology, and 3D printed munition-dropping devices in particular demonstrates a dire need for legislative intervention. These …

The Wildlife Intelligence For Aviation Safety (Wild-Ai), Bao Khoa Tran

Student Research Symposium (SRS)

Wildlife strikes pose a significant safety risk and economic burden to the aviation industry. Over 291,000 strikes have been reported in the U.S. since 1990, causing an estimated $248 million in annual losses. The Wild-AI (Wildlife Intelligence for Aviation Safety) project leverages cutting-edge technologies, including large language models (LLMs), machine learning (ML), explainable AI (XAI), and Unmanned Air Vehicles (UAV) imagery, to enhance wildlife hazard management at airports. Wild-AI transforms traditional Wildlife Hazard Assessments (WHAs) by integrating advanced data analytics and UAV monitoring. By utilizing historical wildlife-strike data and ML algorithms, we will identify key predictors of damaging strikes, such …

Full Issue

Newsletter of the Jussi Björling Societies of the USA & UK

No abstract provided.

Bass Mark Elyn Lived Well, And Remembered Jussi Well, Dan Shea

Newsletter of the Jussi Björling Societies of the USA & UK

How many people are there who still can testify that they heard Jussi Björling on many occasions? Mark Elyn was one who heard Jussi in rehearsal and on stage with him, in three major Verdi operas, in rooms large and small, up close and personal. As a young singer himself, fresh from Seattle’s Cornish School of Music, he was eager to learn useful vocal technique and found inspiration from Jussi’s example.

Jussi-Fest In Voxnabruk July 3rd And 4th, Sue Flaster

Newsletter of the Jussi Björling Societies of the USA & UK

The 21st Annual Jussi-Fest in Voxnabruk went off successfully July 3 and 4 despite challenges: Norwegian tenor Bror Magnus Tödenes, who had been scheduled to appear, was forced to cancel due to a death in the family. As arranger Stefan Olmårs noted, you can’t have a Jussi event without a tenor, so he brought along veteran Swedish tenor Sonny Wallentin and his accompanist wife. They both performed valiantly.

Words Of Remembrance Of Jacob Forsell 1942-2023, Janel E. Lundgren

Newsletter of the Jussi Björling Societies of the USA & UK

The eminent photographer and writer Jacob Forsell has died at the age of 81. He has been of great importance both to Jussi Björling’s cause as well as to the Jussi Björling Society. He had a strong connection to Jussi via his close kinship with John Forsell: he was the grandson of the renowned singer and opera director, who meant so much to Björling’s early career. Therefore, he seemed specially sent to be the editor of a luxurious gift and anniversary book with the name: Jussi: the Song, the Man, the Pictures, together with Harald Henrysson and Björn Ranelid. This …

Jussi Björling Societies Planning To Sponsor New Release Of The 1952 Classic Rca Recording Of Il Trovatore In Outstanding Sound, John H. Haley

Newsletter of the Jussi Björling Societies of the USA & UK

The Jussi Björling Societies and I are pleased to announce plans for an upcoming new sponsored release that will be available by November 2023 exclusively through the Societies (ordering details to be provided soon). This release is being prepared through High Definition Tape Transfers (HDTT), a Canadian label, sourced on a very rare reel-to-reel tape release of this recording, which I am restoring. The tape source appears to be much closer to the master tape than all other releases through the years, and it has extraordinary sound quality, such that this new release will sound substantially better than any prior …

Henry Fogel Zoom Presentation For Jbs-Usa On Tuesday, October 24, 2023, On The Topic,, Janel E. Lundgren

Newsletter of the Jussi Björling Societies of the USA & UK

Arts executive extraordinaire Henry Fogel will conclude the JBS-USA Zoom Series for 2023 with a comparative presentation on Jussi’s live performance and studio recordings, drawing on his exceptional collection of recordings for musical examples. The broadcast will air live on Tuesday, October 24 at 7:30 pm ET, and will be repeated on Saturday, October 28 at 12 noon ET. Members and non-members will be able to register to attend this event on our website beginning September 1.

He Sings In The Spirit Of His Father, Calle Friedner

Newsletter of the Jussi Björling Societies of the USA & UK

It’s a beautiful summer’s day. We are in Jussi Björling’s and his family’s summer paradise on Siarö in the archipelago north of Stockholm, now divided between the two siblings, Ann- Charlotte and Lars. He has built a house of his own and couple of out-buildings in the part of the site where Jussi’s singing studio is situated. Lars is happy: this day he and his wife Leila have been married for exactly seven weeks. We’ll come back to that.

The outdoor temperature is 77 degrees F, but we are sitting talking in the shadow of the trees. Lars says it …

Lars Björling To Speak On “Remembering My Father’S Met Performances, Fall 1959”, Janel E. Lundgren

Newsletter of the Jussi Björling Societies of the USA & UK

JBS-USA is privileged to present Jussi’s son Lars Björling in a special Zoom presentation from Sweden for the Jussi Björling Society USA on Tuesday, August 22, 2023, at 7:30 pm ET, a broadcast which will be repeated on Saturday, August 26 at 12 noon ET. Following the presentation will be a Q & A segment, to which attendees may submit questions.

Lars will recall the fabled performances by his father, on returning to the Met in November of 1959 after an absence of more than 2 ½ years. At Jussi’s first performance of Cavalleria rusticana, according to Harald Henrysson, “his …

Full Issue

Newsletter of the Jussi Björling Societies of the USA & UK

No abstract provided.

The 2022 Jussi Björling Stipendium To Baritone John Lundgren

Newsletter of the Jussi Björling Societies of the USA & UK

Baritone John Lundgren has received the 2022 Jussi Björling Stipendium (Award). This award is given on behalf of The Royal Theatre’s Soloists Foundation, and previous recipients have included soprano Hillevi Martinpelto, violinist Kalle Moraeus and Harald Henrysson. This year’s award was 125,000 kroner (about $12,600 US). Lundgren has also received the Birgit Nilsson Prize in 2006, and was named a Royal Court Singer by King Carl XVI Gustaf in 2021.

Lundgren was educated at Vadstena Academy and in The Opera Academy in Copenhagen. During his studies he joined the ensemble of The Royal Danish Theatre and debuted as Schaunard in …

Thorborg Biography Published, Christer Eklund

Newsletter of the Jussi Björling Societies of the USA & UK

Of the many colleagues who sang with Jussi Björling over the course of his career, Kerstin Thorborg was the closest to him in home ground: she also was born in the province of Dalarna, about 50 miles North of Jussi’s birthplace of Borlänge. In many ways, their careers also were similar, since both had major parts of their professional lives in the United States, centered around the Metropolitan Opera. Thorborg was deeply admired for her vocal range as well as for her acting skills in a wide range of roles.

In 2003 I took over managing the archive of the …

Jussi Björling:, Sue Flaster

Newsletter of the Jussi Björling Societies of the USA & UK

As we announced in the February 2022 issue of the JBS-USA Journal, we are very excited to publish a book this Fall which will describe the founding of the three Jussi Björling Societies, the writing of the four “basic” books about Jussi Björling, and the history and founding of the Jussi Björling Museum, a unique and deeply admired institution. We have taken advantage of the fact that many of the primary members of our various groups are still with us, and have been enthusiastic participants in this project.

The same good fortune applies to the background of the writing of …

The Jussi Björling Museum Emptied

Newsletter of the Jussi Björling Societies of the USA & UK

As was previously announced, the Jussi Björling Museum in Borlänge was closed at the turn of the year 2021/22.

Borlänge municipality had debated the fate of the Museum for years, and a decision was made to move it to, or adjacent to, the municipal library. However, it was not until 10 January 2022 that the Museum Curator was informed that the building was to be emptied by the end of February to serve as an office for the upcoming redevelopment of the nearby Liljan building (for the needs of Dalarna University College). Since no new museum space is available now, …

Remembering Don Goldberg, Walter B. Rudolph

Newsletter of the Jussi Björling Societies of the USA & UK

In my mind, he was a human dynamo. I didn’t know him well, but one couldn’t be around Don Goldberg and not experience who he was. The evening before the official start of our first St. Peter Conference in 2001, everyone around gathered with a few of their favorite recordings. For most of us, this was our introduction to each other. Don was his typical magnetic self, drawing us all together in a manner that left us feeling like we’d known one another for years.

He and I had some natural connection via radio. He had his own show on …

Jussi’S Return To The Metropolitan Opera In 1959, Don Goldberg

Newsletter of the Jussi Björling Societies of the USA & UK

The spring of 1957 was a difficult time for me. I had planned to attend every Bjoerling performance during the 1957-58 season not knowing in the spring of ’57 that those Met performances would be his last ones for two seasons. So the announcement of Jussi’s return to the Met on November 16, 1959 in Cavalleria Rusticana was to begin a special season for me. Getting tickets for that performance involved standing on a long line that stretched down Thirty-ninth Street down to Broadway.