Study of Homogeneous Chipboard Manufacturing u sing Betung Bamboo (Dendrocalamus Asper) Mixed with Polyethylene Addictive

Bamboo is an evergreen plant native to Asia and America that grows at every altitude, even in unideal climate conditions. Betung bamboo or its scientific name Dendrocalamus Asper is one of the bamboo species that are easily found in peninsular Malaysia. This study examined the characteristics of Betung bamboo and its potential to manufacture chipboard. Several tests were conducted, namely modulus of elastic (MOE), modulus of rupture (MOR), thickness swelling (TS), and water absorption (WA) to evaluate the potential of Betung bamboo as the primary material in the manufacture of chipboard mixed with polyethylene as additive are the parameters considered. This study found that the composition of 70% bamboo and 30% polyethylene was produced optimum chipboard which met BS EN standards (British and European Standard). It was also found that the MOE and MOR values of the resulting chipboard exceeded the medium density board standards. For WA and TS values, the chipboard achieved the standard requirements. Thus, this study concludes that chipboard made of Betung bamboo with the addition of polyethylene is suitable to be applied for internal and external doors, and internal paneling for any commercial or domestic building and furniture.

Perbedaan PERBEDAAN NILAI LEKOSIT ANTARA KOMPONEN DARAH PACKED RED CELLS (PRC) DAN PACKED RED CELLS LEUCODEPLETED (PRC-LD) DI UTD PMI KOTA SURABAYA TAHUN 2019

This leukodepleted PRC (PRC-LD) is considered capable of preventing reactions related to blood transfusions because it contains only a small number of leukocytes. The blood component of PRC-LD has also been shown to prevent or reduce transfusion reactions. Leukodepleted is a procedure to reduce the number of leukocytes in the blood or blood components to be transfused to a minimum of <1x106 leukocytes/unit (European standard) or reduce the number of leukocytes >99%. The purpose of this study was to see the difference in leukocyte values ​​in the PRC and PRC-LD components. The method used is analytic, namely research that aims to determine the relationship between variables within the scope of the laboratory. The method used is a comparative study. This study used 30 samples of PRC products and 30 samples of Leucodepleted PRC products at UTD PMI Surabaya City with 450 cc bags. The study was conducted in October - December 2019. The result was that the leukocyte value in the PRC blood component contained blood quality that did not meet the specifications as many as 30 bags (100%) had leukocyte levels >1x106 per bag. Meanwhile, the blood component of PRC-LD contains blood quality that meets the specifications as many as 30 bags (100%), having leukocyte levels <1x106 per bag. Conclusion The quality of PRC Leukodepleted blood component products, the quality of leukocyte levels that meet the specifications, there are 30 blood bags (100%). Keywords: Packed Red Cells Leukodepleted

A Full-Scale Experimental Investigation of Utility Poles Made of Glass Fibre Reinforced Polymer

Utility poles made of glass fibre-reinforced polymer (GFRP) are becoming increasingly common in European countries. Therefore, it is necessary to accurately examine their structural properties to ensure the integrity and safety of the poles. The purpose of this article is to compare the bending resistance of GFRP composite lighting columns obtained using European standard procedures with full-scale experimental tests. Several composite lighting columns were tested as part of the research study, and coupon tests were performed to assess the material properties required to calculate their bending resistance according to European Standard (EN) 40-3-3. The results obtained differed significantly. Furthermore, it was observed that the current standard rules for obtaining the resistance of GFRP poles based on the limit state method show a higher load capacity of the column in comparison to the capacity obtained from the tests.

A Methodology for the Multi-Point Characterization of Short-Term Temperature Fluctuations in Complex Microclimates Based on the European Standard EN 15757:2010: Application to the Archaeological Museum of L’Almoina (Valencia, Spain)

The monitoring and control of thermo-hygrometric indoor conditions is necessary for an adequate preservation of cultural heritage. The European standard EN 15757:2010 specifies a procedure for determining if seasonal patterns of relative humidity (RH) and temperature are adequate for the long-term preservation of hygroscopic materials on display at museums, archives, libraries or heritage buildings. This procedure is based on the characterization of the seasonal patterns and the calculation of certain control limits, so that it is possible to assess whether certain changes in the microclimate can be harmful for the preventive conservation of artworks, which would lead to the implementation of corrective actions. In order to discuss the application of this standard, 27 autonomous data-loggers were located in different points at the Archaeological Museum of l’Almoina (Valencia). The HVAC system (heating, ventilation and air conditioning) at the museum tries to reach certain homogeneous environment, which becomes a challenge because parts of the ruins are covered by a skylight that produces a greenhouse effect in summer, resulting in severe thermo-hygrometric gradients. Based on the analysis of temperatures recorded during 16 months, the air conditions in this museum are discussed according to the standard EN 15757:2010, and some corrective measures are proposed to improve the conservation conditions. Although this standard is basically intended for data recorded from a single sensor, an alternative approach proposed in this work is to find zones inside the museum with a homogeneous microclimate and to discuss next the average values collected in each area. A methodology is presented to optimize the application of this standard in places with a complex microclimate like this case, when multiple sensors are located at different positions.

Experiences using EN 17037 in evaluation of daylighting of dwellings in Slovakia

The daylighting of indoor spaces depends particularly on the urban and architectural parameters of the building environment. The new standard EN 17037, Daylight in Buildings, has brought several changes and uncertainties in design process of daylighting for buildings. The submitted paper is focused on analysis of the philosophy of the new standard criteria in relation to the daylighting of dwellings along with the criteria that have been used in Central European countries for decades. EN 17037 does not distinguish between differences in the functional use of indoor spaces in terms of daylight provision. The new European standard requires at the half of subjectively determined reference plane to achieve the same value of illumination for half of daylight hours per year for any occupied room. The EN standard does not sufficiently respect the specifics of daylighting of dwellings.

Study on inductive method of vibration normalized spectrum of equipment on the communication tower

In today’s society, communication is becoming more and more important. However, communication equipment is subjected to the vibration caused by wind in communication tower for a long time. In this paper, the inductive methods of vibration normalized spectrum for the equipment on the tower are introduced. Combined with the characteristics of communication tower, based on the current national military standards and some related papers, the random vibration environment data from communication tower can be inductive and processed. The energy distribution of the spectrum is compared with that of the European standard. The measured spectrum by induction is used in engineering tests, it also has laid a foundation for improving the reliability of the relevant equipment on the communication tower.

Influence of furniture exploitation on the bending strength of final mountable-dismountable corner joints

The aim of the researches presented in the paper is to show how the exploitation of furniture affect the strength of its connectors, more precisely the bending strength of the final corner dismountable joints for designed furniture – office desk. For studying this influence, 2 office desks were made (from chosen material OSB panels), joined by dismountable connectors, and also from the same material and the same type of connectors, reference test fixtures were made and their bending strength was the value of comparison. Office desks were tested according to European Standard for determining the stability of the structure (EN 527-3:2003 E) and that was simulated exploration of furniture. After that, the final corner compositions were cut off, and its bending strength was compared with the reference test fixtures strength. The research results showed that the exploiting of dismountable furniture has not a significant impact on their compositions strength.

Assessment Of Surface Characteristics Of Coarse Aggregates By Flow Coefficient Method

In this study, for assessment of surface characteristics, the flow coefficient of coarse aggregates was evaluated as an alternative to the widely used crushed and broken surfaces test. It has been proved that visual assessment is not only time consuming but also inaccurate. The European standard EN 933-5 allows to use of a flow coefficient method according to EN 933-6 as an alternative for the assessment of coarse aggregates, but it does not specify any requirements. Therefore, this study aimed to assess the flow coefficient test and if it could replace tradition visual assessment. In total, 28 gravel samples were tested. Following properties and their influence to flow coefficient were evaluated - flakiness, particle size distribution and amount of crushed and rounded surfaces. The results show that the flow coefficient test could be used as an alternative if the boundaries of the granulometric curves are set.

Data-driven prediction of mean wind turbulence from topographic data

This study presents a data-driven model to predict mean turbulence intensities at desired generic locations, for all wind directions. The model, a multilayer perceptron, requires only information about the local topography and a historical dataset of wind measurements and topography at other locations. Five years of data from six different wind measurement mast locations were used. A k-fold cross-validation evaluated the model at each location, where four locations were used for the training data, another location was used for validation, and the remaining one to test the model. The model outperformed the approach given in the European standard, for both performance metrics used. The results of different hyperparameter optimizations are presented, allowing for uncertainty estimates of the model performances.