scholarly journals Thermic Characteristics Of Rice Husk And Polyurethane Composite Materias As Insulation In Fish Cold Storage

2021 ◽  
Vol 6 (2) ◽  
pp. 145-153
Author(s):  
Irwansyah ◽  
Balkhaya ◽  
Nuzuli Fitriadi ◽  
Herdi Susanto
Keyword(s):  
Thermal Conductivity ◽  
Volume Ratio ◽  
Appropriate Technology ◽  
Cold Chain ◽  
Test Results ◽  
Rice Husks ◽  
Cold Temperatures ◽  
Polyurethane Composite ◽  
Storage Place

The process of freezing fish always requires a cooler as a temporary storage place for fish. The ability of the storage to maintain cold temperatures is a serious problem to be considered so that the freshness of the fish can be maintained. Therefore, an appropriate technology is required to support the cold chain system so that fish quality can be maintained. The purpose of this study was to test the thermal conductivity of composite materials for fish storage insulation from a mixture of rice husks and polyurethane so that the price of the box can be reduced but still maintain the quality of the fish. The composition of the composite material was made with a volume ratio of 1:0.5, 1:1, 1:1.5, and 1:2. The thermal conductivity test of the material uses the ASTM E1225-99 standard. All test results were compared with 100% polyurethane material. The results of testing the thermal conductivity of 100% polyurethane material obtained 0.023 W/m.C. From all the test results, the material that is most likely to be applied to fish cooler box insulation is a 1:1 composition having a thermal conductivity value of 0.067W/m.C. Materials with this composition do not affect the expansion of the polyol and isocyanate reactions. This composition is the most economical to be used as insulation for fish storage boxes which can save the use of polyurethane by 50%.

scholarly journals Removal of organic matter from the underground water—a pilot scale technological research

2021 ◽  
Vol 11 (9) ◽  
Author(s):  
Alina Pruss ◽  
Małgorzata Komorowska-Kaufman ◽  
Paweł Pruss
Keyword(s):  
Organic Matter ◽  
Pilot Scale ◽  
Underground Water ◽  
Appropriate Technology ◽  
Test Results ◽  
Treatment Technology ◽  
Technological Research ◽  
Bivalent Iron ◽  
Physical And Chemical

AbstractThe aim of the study was to select an appropriate technology for the treatment of groundwater with particular emphasis on the effectiveness of organic matter removal. The technological research was carried out on a pilot scale for 6 weeks. The pilot station was supplied with groundwater taken from two wells with different physical and chemical composition and mixtures of the two waters. The installation of the pilot station enabled different configuration of technological processes and continuous water sampling past each device. The following parameters were determined for the water samples: temperature, pH, alkalinity, colour, turbidity, COD KMnO4, TOC and dissolved oxygen, total and bivalent iron and manganese. On the basis of the analysis of the test results, it was found that the treatment technology based on natural aeration and rapid filtration processes was effective for water from well no. 2 and the mixtures of waters from well no. 1 and well no. 2, and the quality of treated water was in accordance with the limits specified in the Regulation of the Polish Minister of Health.

Study on Thermal Conductivity of Reinforced Concrete Plate

2013 ◽  
Vol 438-439 ◽  
pp. 321-328 ◽  
Author(s):  
Shun Bo Zhao ◽  
Su Yang ◽  
Xue Zhen Feng ◽  
Mei Jun Lu
Keyword(s):  
Thermal Conductivity ◽  
Reinforced Concrete ◽  
Volume Fraction ◽  
Volume Ratio ◽  
Test Results ◽  
Concrete Plate ◽  
Steel Bar ◽  
Building Envelop ◽  
Steel Bars ◽  
Composite Wall

By the heat flow meter method, the thermal conductivity of reinforced concrete was experimental studied for the energy conservation design of reinforced concrete composite wall as building envelop. The steel bars were arranged as horizontal one-way, horizontal two-way and vertical in the reinforced concrete plates with different reinforcement volume ratio. Based on the test results, the effects of arrangement of steel bar and reinforcement volume ratio on thermal conductivity of reinforced concrete were analyzed. It can be concluded that the thermal conductivity of reinforced concrete was higher than that of concrete and increased with the reinforcement volume fraction, the steel bars in horizontal two-way arrangement brought the reinforced concrete with greater thermal conductivity than that in one-way arrangement, the vertical steel bar made the reinforced concrete with significantly higher thermal conductivity. The series-parallel model and parallel-series model are proposed for predicating the thermal conductivity of reinforced concrete with horizontal steel bars.

scholarly journals ANALISIS KONDUKTIVITAS PANAS PADA MATERIAL ALTERNATIF SEBAGAI INSULASI DINDING RUANG AKOMODASI KAPAL BERBASIS LIMBAH AMPAS TEBU DAN SERBUK KAYU

2020 ◽  
Vol 5 (2) ◽  
pp. 17-21
Author(s):  
Aurista Miftahatul Ilmah Aurista
Keyword(s):  
Thermal Conductivity ◽  
Mineral Wool ◽  
Heat Propagation ◽  
Insulation Material ◽  
Cooling Load ◽  
Wood Powder ◽  
Test Results ◽  
Plastic Foam ◽  
Natural Materials ◽  
Storage Place

The accommodation room on the ship is used as a resting place for the crew and as a storage place for goods on the ship so insulation is needed in each room to withstand the heat propagation on the ship. One type of insulation material on a ship is mineral wool which is made from polyurethane. Polyurethane is a plastic foam that is a mixture of polyol and isocynate and one of the ingredients is polymer which can be obtained from natural materials that contain lots of cellulose such as bagasse and sawdust. the addition of sawdust and bagasse that can be done is 40% of the total volume of the mixture. Then it is carried out to get the thermal conductivity value of each mixture of sawdust, bagasse, and polyurethane with various dosing ratios on the sawdust, to further calculate the cooling load. The test results show the best conductivity value is the mixing of wood powder 0.2 gr which is 2.65 w / mk which can withstand the rate of heat up to 311.59 KW.

Implementasi Voip Server Berbasis IPV6 Dengan Raspberry PI

2019 ◽  
Vol 9 (01) ◽  
pp. 47-54
Author(s):  
Rabbai San Arif ◽  
Yuli Fitrisia ◽  
Agus Urip Ari Wibowo
Keyword(s):  
Internet Protocol ◽  
Wireless Transmission ◽  
Raspberry Pi ◽  
Test Results ◽  
Average Delay ◽  
Ipv6 Network ◽  
Ip Network ◽  
Selection Of ◽  
Better Than

Voice over Internet Protocol (VoIP) is a telecommunications technology that is able to pass the communication service in Internet Protocol networks so as to allow communicating between users in an IP network. However VoIP technology still has weakness in the Quality of Service (QoS). VOPI weaknesses is affected by the selection of the physical servers used. In this research, VoIP is configured on Linux operating system with Asterisk as VoIP application server and integrated on a Raspberry Pi by using wired and wireless network as the transmission medium. Because of depletion of IPv4 capacity that can be used on the network, it needs to be applied to VoIP system using the IPv6 network protocol with supports devices. The test results by using a wired transmission medium that has obtained are the average delay is 117.851 ms, jitter is 5.796 ms, packet loss is 0.38%, throughput is 962.861 kbps, 8.33% of CPU usage and 59.33% of memory usage. The analysis shows that the wired transmission media is better than the wireless transmission media and wireless-wired.

Penerapan Proses Keperawatan di Rumah Sakit dalam Meningkatkan Mutu Keperawatan

2020 ◽  
Author(s):  
Kristin Natal Riang Gea
Keyword(s):  
Quality Of Service ◽  
Nursing Care ◽  
Appropriate Technology ◽  
Nursing Process ◽  
General Management ◽  
Management Concepts ◽  
Optimal Health ◽  
Service Standards ◽  
Management Of Care

AbstrakManajemen asuhan keperawatan merupakan suatu proses keperawatan yang menggunakan konsep manajemen secara umum didalamnya seperti perencanaan, pengorganisasian, pengarahan dan pengendalian atau evaluasi. Peningkatan mutu pelayanan adalah derajat memberikan pelayanan secara efisien dan efektif sesuai dengan standar profesi, standar pelayanan yang dilaksanakan secara menyeluruh sesuai dengan kebutuhan pasien, memanfaatkan teknologi tepat guna dan hasil penelitian dalam pengembangan pelayanan kesehatan/ keperawatan sehingga tercapai derajat kesehatan yang optimal. Kualitas pelayanan keperawatan di rumah sakit tidak akan berjalan dengan baik apabila proses keperawatan yang dilaksanakan tidak terstruktur dengan baikKata Kunci : Manajemen Keperawatan, Kualitas Pelayanan,.standar proses keperawatanAbstract Nursing care management is a nursing process that uses general management concepts in it such as planning, organizing, directing and controlling or evaluation. Improving the quality of service is the degree of providing services in an efficient and effective in accordance with professional standards, service standards are implemented thoroughly in accordance with the needs of patients, utilizing appropriate technology and research results in the development of health services / nursing to achieve optimal health. The quality of nursing care in the hospital will not run properly if the nursing process does not properly implemented.Keywords: Management of Care of Nursing, Quality of Service, standard nursing process,

Sinonasal effects of external dacryocystorhinostomy

2021 ◽  
pp. 1-4
Author(s):  
H Eyigor ◽  
E A Cetinkaya ◽  
D T Coban ◽  
G Ozturk ◽  
Ö Erdem
Keyword(s):  
Mucociliary Clearance ◽  
Nasal Symptom ◽  
Ciliary Activity ◽  
Test Results ◽  
Saccharine Test ◽  
Significant Difference ◽  
Symptom Scores ◽  
Endoscopic Score ◽  
External Dacryocystorhinostomy

Abstract Objective External dacryocystorhinostomy is thought to cause mucociliary dysfunction by damaging the mucosa, in turn affecting ciliary activity and mucus quality. This study investigated the effect of external dacryocystorhinostomy on sinonasal function. Methods Patients scheduled for unilateral external dacryocystorhinostomy who underwent endoscopic nasal examination and paranasal sinus computed tomography were included in this study. A saccharine test was performed on the planned surgical side and the mucociliary clearance time was determined. The sinonasal quality of life was measured in all patients, pre-operatively and at six months post-operatively, using the Sino-Nasal Outcome Test-22. The Lund–Kennedy endoscopic score was also determined in all patients, both pre- and post-operatively. Results The study comprised 28 patients (22 females and 6 males). A statistically significant difference was found between the pre- and post-operative saccharine test results (p = 0.006), but not between the pre- and post-operative Sino-Nasal Outcome Test-22 scores (p > 0.05). Conclusion This study is one of only a few to investigate the effect of external dacryocystorhinostomy on sinonasal function. The results showed that external dacryocystorhinostomy impairs mucociliary clearance. The surgical procedure is well tolerated and does not significantly change nasal symptom scores.

Improvement of thermal conductivity of rigid polyurethane foams with aluminum nitride filler

2021 ◽  
pp. 026248932198897
Author(s):  
Serife Akkoyun ◽  
Meral Akkoyun
Keyword(s):  
Thermal Conductivity ◽  
Aluminum Nitride ◽  
Polyurethane Foams ◽  
Thermal Transitions ◽  
Rigid Polyurethane Foams ◽  
Noticeable Increase ◽  
Polyurethane Composite ◽  
Composite Foams ◽  
Step Procedure ◽  
Electrical Conductivities

The aim of this work is the fabrication of electrically insulating composite rigid polyurethane foams with improved thermal conductivity. Therefore, this study is focused on the effect of aluminum nitride (AlN) on the thermal and electrical conductivities of rigid polyurethane foams. For this purpose, aluminum nitride/rigid polyurethane composite foams were prepared using a three-step procedure. The electrical and thermal conductivities of the foams were characterized. The thermal transitions, mechanical properties and morphology of the foams were also examined. The results reveal that AlN induces an increase of the thermal conductivity of rigid polyurethane foam of 24% which seems to be a relatively noticeable increase in polymeric foams. The low electrical conductivity of the foams is preserved.

An improved nonlinear model considering relative velocity for the friction behavior between untwisted glass-fiber tow and roller

2021 ◽  
pp. 004051752110308
Author(s):  
Yang Liu ◽  
Zhong Xiang ◽  
Xiangqin Zhou ◽  
Zhenyu Wu ◽  
Xudong Hu
Keyword(s):  
Friction Coefficient ◽  
Glass Fiber ◽  
Relative Velocity ◽  
Friction Model ◽  
Woven Fabric ◽  
Test Results ◽  
Application Process ◽  
Friction Behavior ◽  
Improved Model

Friction between the tow and tool surface normally happens during the tow production, fabric weaving, and application process and has an important influence on the quality of the woven fabric. Based on this fact, this paper studied the influence of tension and relative velocity on the three kinds of untwisted-glass-fiber tow-on-roller friction with a Capstan-based test setup. Furthermore, an improved nonlinear friction model taking both tension and velocity into account was proposed. According to statistical test results, firstly, the friction coefficient was found to be positively correlated with tension and relative velocity. Secondly, tension and velocity were complementary on the tow-on-roller friction behavior, with neither being superior to the other. Thirdly, an improved model was found to present well the nonlinear characteristics between friction coefficient and tension and velocity, and predicational results of the model were found to agree well with the observations from Capstan tests.

scholarly journals A Milk Foodomics Investigation into the Effect of Pseudomonas fluorescens Growth under Cold Chain Conditions

Foods ◽  
2021 ◽  
Vol 10 (6) ◽  
pp. 1173
Author(s):  
Paolo Bellassi ◽  
Gabriele Rocchetti ◽  
Lorenzo Morelli ◽  
Biancamaria Senizza ◽  
Luigi Lucini ◽  
...  
Keyword(s):  
Pseudomonas Fluorescens ◽  
Degradation Products ◽  
Storage Conditions ◽  
Cold Chain ◽  
Lower Sensitivity ◽  
Multivariate Statistical ◽  
Proteolytic Activities ◽  
Quality Of Milk ◽  
Potential Tool

Pseudomonas fluorescens is a psychrotrophic species associated with milk spoilage because of its lipolytic and proteolytic activities. Consequently, monitoring P. fluorescens or its antecedent activity in milk is critical to preventing quality defects of the product and minimizing food waste. Therefore, in this study, untargeted metabolomics and peptidomics were used to identify the changes in milk related to P. fluorescens activity by simulating the low-temperature conditions usually found in milk during the cold chain. Both unsupervised and supervised multivariate statistical approaches showed a clear effect caused by the P. fluorescens inoculation on milk samples. Our results showed that the levels of phosphatidylglycerophosphates and glycerophospholipids were directly related to the level of contamination. In addition, our metabolomic approach allowed us to detect lipid and protein degradation products that were directly correlated with the degradative metabolism of P. fluorescens. Peptidomics corroborated the proteolytic propensity of P. fluorescens-contaminated milk, but with lower sensitivity. The results obtained from this study provide insights into the alterations related to P. fluorescens 39 contamination, both pre and post heat treatment. This approach could represent a potential tool to retrospectively understand the actual quality of milk under cold chain storage conditions, either before or after heat treatments.

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