Adipose-Derived Stem Cells for Facial Rejuvenation

The interest in regenerative medicine is increasing, and it is a dynamically developing branch of aesthetic surgery. Biocompatible and autologous-derived products such as platelet-rich plasma or adult mesenchymal stem cells are often used for aesthetic purposes. Their application originates from wound healing and orthopaedics. Adipose-derived stem cells are a powerful agent in skin rejuvenation. They secrete growth factors and anti-inflammatory cytokines, stimulate tissue regeneration by promoting the secretion of extracellular proteins and secrete antioxidants that neutralize free radicals. In an office procedure, without cell incubation and counting, the obtained product is stromal vascular fraction, which consists of not only stem cells but also other numerous active cells such as pericytes, preadipocytes, immune cells, and extra-cellular matrix. Adipose-derived stem cells, when injected into dermis, improved skin density and overall skin appearance, and increased skin hydration and number of capillary vessels. The main limitation of mesenchymal stem cell transfers is the survival of the graft. The final outcomes are dependent on many factors, including the age of the patient, technique of fat tissue harvesting, technique of lipoaspirate preparation, and technique of fat graft injection. It is very difficult to compare available studies because of the differences and multitude of techniques used. Fat harvesting is associated with potentially life-threatening complications, such as massive bleeding, embolism, or clots. However, most of the side effects are mild and transient: primarily hematomas, oedema, and mild pain. Mesenchymal stem cells that do not proliferate when injected into dermis promote neoangiogenesis, that is why respectful caution should be taken in the case of oncologic patients. A longer clinical observation on a higher number of participants should be performed to develop reliable indications and guidelines for transferring ADSCs.

Footstep Power Generation

Piezoelectric energy harvesting is the new upcoming green and clean energy which works on piezoelectric principle. The lost energies are being captured and restored by the transducer and piezoelectric sensor in to a battery. The vibrations and motions caused by humans and machines will be used and stored in battery are being used by the small and low power electronic component and wireless technology, starts being to develop recently and so, necessary steps are taken to develop and find a new power source from harvesting technique. The power and energy from different sources are commonly used and simple power harvesting circuits will replace the power supplies which is currently used. These materials harvest small amount of energy which are ignored and wasted in the surrounding but this energy can be useful for powering the small electrical components in a system. The research made to accumulate the power through this method and sources so an estimate amount of energy can be produced and stored. At the end of this project, the outcomes should be a stable power source to charge a battery and light a bulb of small watt and further can be used for multiple tasks and applications. Keywords: Energy harvesting, Piezoelectric sensors, Solid works Analysis

Evaluation of Picker Discomfort and Its Impact on Maintaining Strawberry Picking Quality

In this paper, the authors present the relationship between the assumptions of ergonomics in the work of a strawberry picker and quality of picked fruit. The body posture that a person adopts while working has a significant impact on their health, working comfort, and productivity, but also on the quality of the fruit that is harvested. This paper identifies three characteristic picker positions during strawberry harvesting. A synchronized surface electromyography (sEMG) instrument together with the Tekscan® surface pressure measurement system allowed for the determination of the influence of working position on changes in the load of the picker’s musculoskeletal system and the surface pressure exerted on the fruit during manual strawberry picking, which are decisive factors for maintaining fruit quality. In addition, compression tests on whole strawberry fruit were carried out as a benchmark to evaluate and compare the maximum forces as well as the destructive pressures on the fruit. From the tests, we found that the most comfortable position of the worker’s body was determined along with the harvesting technique (position during work) that has the least negative effect on the quality of the harvested fruit. Consequently, the level of dynamic load on the worker was determined.

Optimum energy harvesting model for bidirectional cognitive radio networks

Wireless devices’ energy efficiency and spectrum shortage problem has become a key concern worldwide as the number of wireless devices increases at an unparalleled speed. Wireless energy harvesting technique from traditional radio frequency signals is suitable for extending mobile devices’ battery life. This paper investigates a cognitive radio network model where primary users have their specific licensed band, and secondary users equipped with necessary hardware required for energy harvesting can use the licensed band of the primary user by smart sensing capability. Analytical expressions for considered network metrics, namely data rate, outage probability, and energy efficiency, are derived for uplink and downlink scenarios. In addition, optimal transmission power and energy harvesting power are derived for maximum energy efficiency in downlink and uplink scenarios. Numerical results show that outage probability improves high transmission power in the downlink scenario and high harvested power in the uplink scenario. Finally, the result shows that energy efficiency improves using optimum transmission power and energy harvesting power for downlink and uplink scenarios.

The radial artery: Open harvesting technique

The radial artery is an important conduit in coronary artery surgical revascularization due to its robust long-term clinical outcomes. The use of the radial artery has become popularized in recent times. Therefore it is essential for junior surgeons to master harvest techniques that are safe, reliable, and easy to replicate.

Step-by-step harvesting of various grafts for coronary artery bypass surgery

One of the key aspects to obtain good long-term outcomes after coronary artery bypass grafting is graft quality. Meticulous graft harvesting is an important technical aspect in successfully performing high-quality coronary surgery and is associated with improved long-term graft patency. Hence, developing surgical skills in this necessary surgical step is of utmost importance in coronary bypass surgery. The following video tutorial presents a step-by-step audiovisual description of the skeletonized harvesting technique of the left internal mammary artery, open and endoscopic radial artery harvesting, and open saphenous vein graft harvesting.

SUSTAINABLE WATER AVAILABILITY MODEL WITH RESERVOIR TECHNIQUE BY USING ISM (INTERPRETATIVE STRUCTURAL MODELING) METHOD IN BANGKA ISLAND INDONESIA

The reduced of clean water availability is a problem in almost all parts of the world. This condition is caused by many factors such as population growth, industrialization, urbanization, transportation, etc. The same thing happened in Bangka Island. Based on the research conducted by Hambali (2013) the water balance in Pangkal Pinang was in poor condition (>100%) with a water balance value of 388.13% in 2013, 454% in 2018 and 531.04% in 2023. As the condition of the reduced of clean water availability, especially in Bangka Island, it is necessary to have alternative in providing clean water from other sources as an effort to conserve water to maintain the availability of clean water. One of the water conservation efforts that can be done to maintain the availability of clean water is by using rain harvesting technique. Rainfall source in Bangka Island is possible at reservoir(kulong/embung) of tin mining that has been done. By using the Interpretative Structural Modeling method, it is possible to obtain factor element, institutional element and actor element in sustainable water availability with reservoir technique in Bangka Island. Three key elements were found, namely institutional, social and environmental. Furthermore, the three main institutional elements were 1) regulatory context. 2) trust in community development and 3) positive relation with the community. Meanwhile, the 3 key actors were 1) Technical institution/unit. 2) Financial Institution and 3) Department of Public Works and Housing