Kontribusi Sarana Proses Belajar dan Kemampuan Berpikir Siswa terhadap Kompetensi Keterampilan Instalasi Jaringan Lokal

The aim of this research is to determine the contribution of facility learning process and student thinking skill towards skill competencies of local area network installation in private vocational students computer engineering and network in Malang City. Type and data analysis of this research is using a quantitative approach. The samples used are as many as 232 students. Data collection for facility learning process and thingking skill is using questionnaire, while data collection for skill competencies of local area network installation is using value documentation. Data analysis included descriptive and regression. The results showed that: (1) the contribution of facility learning process towards skill competencies of local area network installation by 22,3%; (2) the contribution of student thingking skill towards skill competencies of local area network installation by 35,1%; and (3) the contribution of facility learning process and student thingking skill simultaneously towards skill competencies of local area network installation by 44,1%. Penelitian ini bertujuan untuk mengetahui kontribusi sarana proses belajar dan kemampuan berpikir siswa terhadap kompetensi keterampilan instalasi jaringan lokal siswa TKJ di SMK Negeri Kota Malang. Jenis dan data analisis penelitian ini termasuk dalam penelitian kuantitatif. Jumlah sampel yang digunakan sebanyak 232 siswa. Pengumpulan data untuk variabel sarana proses belajar dan kemampuan berpikir siswa dilakukan dengan angket, sedangkan untuk variabel kompetensi keterampilan instalasi jaringan lokal dilakukan dengan dokumentasi nilai. Analisis data meliputi deskriptif dan regresi. Hasil penelitian menunjukkan: (1) kontribusi sarana proses belajar terhadap kompetensi keterampilan instalasi jaringan lokal siswa sebesar 22,3%; (2) kontribusi kemampuan berpikir siswa terhadap kompetensi keterampilan instalasi jaringan lokal siswa sebesar 35,1%; dan (3) kontribusi sarana proses belajar dan kemampuan berpikir siswa secara simultan terhadap kompetensi keterampilan instalasi jaringan lokal siswa sebesar 44,1%

The Effect of Temperature and Addition of Cao to Hydrogen Production From Pattukku Coal Char Gasification

Hydrogen is an environment-friendly fuel and has a high caloric value. Hydrogen as a molecule is not found in nature, but it is found in compounds with other elements. Besides catalytic steam reforming of natural gas, hydrogen can also be produced from thermochemical processes such as combustion, pyrolysis, and gasification. The process of gasification using steam as gasification agent can increase the yield of H2 in the gas products. The objectives of this research are to study the influence of temperature and the addition of CaO on H2 production. This research was conducted in an up-draft reactor for 60 minutes with three different temperatures; i.e. 600, 700, and 800 oC and ratio of CaO:char of 0 and 0.5. Based on this study, the rise of temperature will improve the yield of H2 and CO2 in the gas products. At gasification temperature of 800 oC, the yield of H2 and CO2 is maximum. Moreover, the addition of CaO can improve the char conversion and reduce the concentration of CO2 in the gas products

The Synthesis of Glycerol Carbonate From Biodiesel by Product Glycerol and Urea Over Amberlyst 15

The growing utilization of biodiesel as a renewable fuel has generated a large surplus of glycerol as a major byproduct. The prices of glycerol continue to drop in such an oversaturated market. Therefore, new uses are being developed for glycerol to produce value-added chemicals. Among those chemicals, glycerol carbonate has many application in various fields. Glycerol carbonate is mostly used as a solvent in cosmetic and pharmacheutical industries due to its low toxicity, high boiling point, and low vapor pressure. The synthesis of glycerol carbonate from glycerol and urea using Amberlyst15 as a catalyst was being conducted in this study. The reaction was carried out using a batch reactor for 5 hours with the condition of the reaction temperature was around 120oC, mole ratios of reactant of urea:glycerol were 0.8:1, 0.9:1, 1:1, and 1.2:1 , catalyst concentrations were 2%, 2,5%, 3%, and 4%, and mixing speeds were 370 rpm, 525 rpm, and 700 rpm. It is found that the optimum conversion of glycerol was obtained at 120oC with 5 hours of reaction using an equimolar amount of glycerol and urea with catalyst load of 3%. Mixing speed did not affect glycerol conversion. Amberlyst15 as catalyst was also stable enough to be reused at least for three times

Perencanaan Perbaikan Sungai Babon Kota Semarang

Flooding is a situation where areas not normally inundated with water becomes stagnant. And very adverse circumstances moriil both material as well as inhibition of transport impact on the rate of the economy of a region. Flooding problems that occurred in the city of Semarang is partly due to overflowing, one of the river is the river layer. Babon river have a length of about 17 km starting from Pucang Gading Dam downstream to the estuary through Karang Roto Dam. Babon river conditions experienced narrowing and shallowing flow leads to reduced capacity to cross the river flood discharge flow. Babon river can no longer accommodate the flood discharge that occurs especially in the rainy season so that commemorate the area around the river layer. In addition, the floods also caused the creek bank that opened for the access road so the water from the river could easily overflow. From studies and calculations have been done, solving this problem is to conduct repairs on the Babon River, by improving the flow and cross the river and make retrofitting Babon River on slopes / riverbanks prone to landslides. So as to reduce the level of flooding in the city of Semarang

Sintesis Bioaditif Gasoline Melalui Ketalisasi Gliserol Menggunakan Katalisator Padat

Utilization of glycerol side product from biodiesel as waste management application is required for reduced negative effect which possible emerged. Glycerol have three bond of hydroxyde, so its opportunity to utilize to be solketal as bio-additive of gasoline. Indion 225 Na ion exchanger resin is strong acid cation category and low prices, so its potency to use alternatively of solid catalyst to get efficient and economic process. The purpose of this research was focussed to search of the best condition by optimalization indion 225 Na performance as catalyst in glycerol ketalization reaction, by integrated of variables that have effected to reaction for maximize glycerol coversion. To get maximize of reactants molecular interaction and for optimalization indion 255 Na performance, observation conducted in the range variables which widely enough that were reactant ratio of 5:1-6:1 mole of acetone mole/mole of glycerol, diameter size catalyst of 20-40 mesh, catalyst concentration of 3-5% mass of acetone, and reaction temperature of 35-65oC. Result of the research showed that indion 225 Na catalyst have good performance, by glycerol conversion to reach of 51.89%. Glycerol conversion mentioned was obtained at reactant ratio of 6:1 mole of acetone/mole of gycerol, diameter size catalyst of 40 mesh, catalyst concentration of 4% mass of acetone, and reaction temperature of 65oC

Perencanaan Eko-drainase Kawasan Perumahan Tembalang Pesona Asri – Semarang

As the construction rapidly growing in Indonesia, it causes the land decreasing that can be used to absorb water. This phenomenon will cause an often flood in rainy season and drought in dry season. On the other side, the degradation of land infiltrations as the effect of the changing of environment. Before the development of the area, the studied area contributes of flow by 0,167 m3/s and volume of run-off equal to 601,2 m3. After theconstruction of Tembalang Pesona Asri regency , the post-development peak of flow and run-off volume increase to 0,573 m3/s and 2061,8 m3. Eco-drainage is defined as efforts to manage the excess of rainfall water by infiltrating into the ground as much as possible or flowing naturally into the river without exceeding the capacity of the river before. Eco-drainage facilities that offeredin this final task included infiltration wells, and bioretention cell. To restore the flow and volume of runoff around the pre-construction condition, the minimum eco-drainage facilities need 177 units of infiltration wellswith diameter size dimension of 1,5m depth of 3m, 1300 m2 of bioretention cell which 560 m2 located in Blok R and 740 m2 in Blok A. The construction of this Eco-drainage facility in the Tembalang Pesona Asri regency area can decrease runoff of 1220,419 m3 or 83,5 % from the runoff water cause by the regency construction. This construction of the Eco-drainage facility need approximately 3 months of time with total cost Rp. 1.209.126.133,- (one billion two hundred and nine million one hundred twenty-six thousand one hundred and thirty-three rupias). The houses total in Tembalang Pesona Asri Regency are 287 units, so each house's contribution is equal to Rp. 4.212.983,- (four million two hundred twelve thousand nine hundred eighty three

Spontaneous umbilical cord hematoma causing still birth: a case report in Madagascar

Spontaneous umbilical cord hematoma is uncommon complication during delivery. It is responsible for severe fetal distress or death. We report a case of a 28 year-old primigravida Malagasy woman at the 37th weeks of gestation. She was admitted in the delivery room for beat oscillating on the fetal heart monitoring at the beginning of labour. Cesarean section was indicated for acute fetal distress in monitoring at dilation 5cm of the cervix traduced by some decelerations.  But she gives birth to a still born female fetus by vaginal way short time after. A 5,5 cm hematoma was discovered on umbilical cord. This still birth may be due to anoxia during acute compression of the umbilical vessels by the hematoma. So, placental and cord examinations in cases of unexplained fetal hypoxia and stillbirth are very important

ODS-materials for high temperature applications in advanced nuclear systems

AbstractA ferritic ODS-alloy (Fe-14Cr-1W-0.25Ti) has been manufactured by application of the powder metallurgical production route involving at first mechanical alloying of ∼10kg pre-alloyed steel powder together with an Y2O3 addition for 12h in a high energy industrial ball mill under hydrogen atmosphere at the company ZOZ GmbH. As a next step, one part of the alloyed powder was hot extruded into rods while another portion was hot isostatically pressed into plates. Both materials were then heat treated. A characterization program on these ODS-alloy production forms included microstructural and mechanical investigations: SANS and TEM assume the existence of Y2Ti2O7 nano clusters and show a bimodal distribution of ODS-particle sizes in both ODS variants. EBSD maps showed a strong 〈110〉 texture corresponding to the α fiber for the hot extruded ODS and a slight 〈001〉 texture for the hipped ODS material. Fracture toughness tests in different specimen orientations (extruded ODS) with mini 0.2T C(T) specimens together with Charpy impact tests revealed anisotropic mechanical properties: Promising (fracture) toughness levels were obtained in the specimen orientation perpendicular to the extrusion direction, while the toughness levels remained low in extrusion direction and generally for the hipped ODS material at all test temperatures. The fracture toughness tests were performed according to ASTM E 1921 and 1820 standards