Path-dependent Vortex Switching in Ferroelectric Nanoplate Junctions Toward a Memory Device Concept

Ferroelectric vortex has attracted much attention as a promising candidate for memories with high density and high stability. It is a crucial problem to precisely manipulate the vortex chirality in order to utilize it to store information. Nevertheless, so far, a practical and direct strategy for vortex switching is still lacking. Moreover, the strong coupling of chirality between neighboring vortices in continuous systems like superlattices limits the application of ferroelectric-vortex-based memories. Here, we design a ferroelectric nanoplate junction to break the strong coupling between neighboring vortices. Phase-field simulation results demonstrate that the vortex chirality of the nanoplates could be efficiently tuned by sweeping local electric and thermal fields in the nanoplate junction. More importantly, the weak coupling between two neighboring nanoplates through the intermediate junction brings a deterministic vortex switching behavior. Based on this, we propose a concept of vortex memory devices. Our study provides an effective way to control the vortex chirality and suggests an opportunity for designing new memory devices based on ferroelectric vortex.

Masalah dan Optimasi Rapid Sand Filter

Rapid Sand Filter is the most popular unit operation in water treatment plant although it has some problems in its operation and maintenance. But this filter is used widely in Indonesia by PDAM, a water company, because of its capability to treat big capacity of water. The crucial problem is backwashing, about the upflow velocity in theoretical and practical aspects.

Effects of The Long-Time Wearing of Gloves by Health Care Workers Managing Covid-19 Assessed by Electrodermal Activity: A Pilot Study

Continues wearing gloves is a crucial problem among health care workers treating patients with coronavirus (COVID-19) infection that may cause skin complications. In the present study, the skin conductance (SC), skin potential (SP) and skin susceptance (SS) were used to identify the effects of long-term wearing gloves among health care workers managing COVID-19. The experimental procedure was repeated 30 times on three subjects recruited as volunteers to wear gloves for 4 hours. The baseline of parameters SC, SP, and SS were recorded at normal conditions without wearing the glove at zero time (To). The parameters were again recorded in the cases of glove-wearing with and without zinc oxide ointment (ZnO) for the same period. Noticeable differences were found in each of SC, SP and SS for subjects who wore gloves when compared to the baseline for 4 h. Results also showed significant differences in each of SP and SS during the same period with applying ZnO comparing to wearing gloves without applying ZnO. The results show that skin hydration is significantly improved by using ZnO. However, changing gloves at least every four hours of continuous wearing is recommended.

SITUATION ANALYSIS OF YACHT FURNITURE SECTOR BUSINESSES

Yacht Industry is one of the important and developing sectors and yacht furniture manufactory is a branch of this sector those are growing day by day. Important that yacht and yacht furniture are both as status symbols and integrate each other. Seeing yachts and furniture as status symbols is important for these two complementary sectors. This importance is even more significant as yacht furniture manufacturing is the second largest cost item in yacht building after engine equipment.Yacht furniture manufactoring has important position in the yacht industry, in the future this importance will be understood better. It is significant to make researches on yacht furniture manufactoring’s technology use, quality, institutionalization, efficiency, employment, added value, branding and design will help to develop and improve our economy. When The Turkish Yacht Furniture Sector is compared to its competitors it has a cheap but qualified workforce and a central location close to all markets. Using results obtained from this study; although companies mostly solve their design and production drawings with architects and engineers in their own design offices, the most important problem is production managment and planning. Also the most crucial problem about production side is that qualified workers do not have sufficient skills. For those problems, the sector should be introduced correctly and yacht educational schools should be increased. In our country, yacht furniture sector which is sub-sector under the yacht building industy that is dynamicly developing in last decate despite the contraction in developed countries.

Preliminary Assessment of Microplastic Pollution Index: A Case Study in Marmara Sea

Marine litter is a crucial problem for marine environment, and this problem is generally based on anthropogenic activities. Even though human-induced activities that cause marine litter are well known, they have not been assessed for the microplastic pollution yet. Here, we present the Microplastic Pollution Index (MPI); a fast, convenient, inexpensive and semi-quantitative tool for assessing land- and marinebased pressures on the sampling area. In this preliminary study, MPI were determined for eight different locations in Marmara Sea. The Marmara Sea is under the effect of several pressures, which can be seen from MPI results. Furthermore, currents and coastline morphology affect the retention time of water at the coastal zone. The highest MPI values were obtained from the Izmit and Bandırma gulfs, whereas the lowest value was found at entrance of the Dardanelle Strait. MPI values and manta net abundance values for each station showed a good linear relation (R2 = 0.58; F = 7.113; DF =1, q = 0.045). No correlation was found between the water column and sediment abundance values. MPI is providing information on microplastic pollution, which is useful to create an effective monitoring strategy. Furthermore, environmental managers can use this information to combat, restore and protect coastal waters against the microplastic pollution.

COVID-19 Pandemic: Its Impact On Learning Motivation (The Fluctuation During Three Different Phases)

Education is a critical component that cannot be separated from an individual’s life. One of many important factors that could support, encourage, and give zeal in the learning process is motivation. The COVID-19 pandemic nowadays indirectly triggers a rapid and drastic change in the learning process, one of them being lecture that must be held online. This repeated cross-sectional research aimed to give a description regarding the fluctuation of students’ academic motivation level before, in the beginning, and until one-year after online learning. The data used in this study are primary and secondary data which are collected gradually and analyzed using Summary Independent Sample T-Test. The result of this research showed no significant differences in academic motivation before COVID-19 and during the early days of Learning from Home (µbefore = 4.777; µbeginning = 4.808; sig = 0.432), nevertheless, a significant decrease is observable one year after the online learning (µnow = 4.345; sigbefore = <0.001; sigbeginning = <0.001). The decrease in students’ academic motivation is certainly a crucial problem that is prioritized to be resolved. Hence, lecturers need to adapt with this change and create learning innovation in order to trigger students’ learning motivation.

Effects of Deoxynivalenol and Fumonisins on Broiler Gut Cytoprotective Capacity

Mycotoxins are a crucial problem for poultry production worldwide. Two of the most frequently found mycotoxins in feedstuffs are deoxynivalenol (DON) and fumonisins (FUM) which adversely affect gut health and poultry performance. The current knowledge on DON and FUM effects on broiler responses relevant for gut detoxification, antioxidant capacity, and health is still unclear. The aim of this study was to assess a range of selected molecular intestinal biomarkers for their responsiveness to the maximum allowable European Union dietary levels for DON (5 mg/kg) and FUM (20 mg/kg) in broilers. For the experimental purpose, a challenge diet was formulated, and biomarkers relevant for detoxification, antioxidant response, stress, inflammation, and integrity were profiled across the broiler intestine. The results reveal that DON significantly (p < 0.05) induced aryl hydrocarbon receptor (AhR) and cytochrome P450 enzyme (CYP) expression mainly at the duodenum. Moreover, DON and FUM had specific significant (p < 0.05) effects on the antioxidant response, stress, inflammation, and integrity depending on the intestinal segment. Consequently, broiler molecular responses to DON and FUM assessed via a powerful palette of biomarkers were shown to be mycotoxin and intestinal site specific. The study findings could be highly relevant for assessing various dietary bioactive components for protection against mycotoxins.

SELECTING SUITABLE STUDENTS FOR JOB BASED ON THEIR CAPACITY

Nowadays, digital transformation in education is an important and urgent task in most of universities. This process brings many benefits to both teacher and student, particularly job for a graduate. Consequently, how to help a last-year student has a suitable job becomes a crucial problem. To advise learner to select a suitable job, we need an insightful analysis of learner’s capacity. Thus, in this paper, we propose a method which uses student’s knowledge and skills data to choose the best suitable students for a job requirement. Firstly, learner’s capacity is evaluated by subject marks and activities in school, therefore, both subject and activity are described as the structure of obtainable skills and knowledge. Then, we also describe a job requirement as a set of skills and knowledge. In the next step, we calculate the real capacity of the student. Finally, we find students who have the real capacity meet the job requirement by applying decision making model.

Early Conflict Checking in Two Phase Commit Protocol for Replicated State Machines

Representing an algorithmic workflow as a state machine is a frequently used technique in distributed systems. Replicating a state machine in a fault tolerant way is one of the main application areas under this context. When implementing a replicated state machine, a crucial problem is to maintain consistency among replicas that might handle various different requests arriving at each different replica. This problem requires maintaining a single consistent ordering of the distributed requests handled separately by replicas. Basic consensus protocols such as two phase commit (2PC), can be used to maintain consistency between replicas whenever a request is to be processed. In this study we modify 2PC protocol to take advantage of basic properties of a state machine and detect possible write conflicts earlier. Our experiments on distributed cloud environments show that our modified 2PC protocol increases the throughput and decrease wasted write operations by a significant amount.

EVALUASI PENGELOLAAN SAMPAH DI WILAYAH PESISIR KABUPATEN KEPULAUAN ANAMBAS Waste Management Evalution In Coastal Area Of Anambas Islands

Garbage is still a crucial problem that can pollute and damage the environment in several areas in Indonesia. Anambas Islands Regency which is a coastal area also has the potential to experience marine pollution, so that waste management is needed early on. However, until now, waste management has not become a priority for the attention of the community and local governments. To find out how the condition of the waste management system in general, a study of waste management in the Anambas Islands Regency was carried out. The main factors causing the less than optimal waste management in the Anambas Islands Regency are the lack of infrastructure, the low understanding of the community in managing waste, and the weak application of the Anambas Islands Regency Perda. Therefore, in order to optimize waste management, support in the form of adequate facilities and also the application of a Perda which is strictly implemented from the local government of the Anambas Islands Regency is needed.