Analisis Gaya Spesifik Pemotongan Sabut Kelapa Muda (Cocos Nucifera)

To design a young coconut trimming machine, it's important to analyze the cutting mechanism of young coconut husk. The aim of this study were to analyze the cutting mechanism of young coconut husk and generate mathematical model of specific cutting force. Sharpening angle, cutting angle and sharpened knife were optimized to get the lowest cutting force. Mathematical model has been generated to estimate the maximum cutting force for one side sharpened knife and two side sharpened knife with cutting angle (θ) at 0Oand above 0O. Based on the analysis of this study, the type of knife that require the lowest cutting force is two side sharpened knife with sharpening angle (β) = 10O and cutting angle (θ)= 30O

Carbon Stock in Integrated Field Laboratory Faculty of Agriculture University of Lampung

This study aimed to determine the amount of carbon stock and CO2 plant uptake in the Integrated Field Laboratory (IFL) Faculty of Agriculture University of Lampung. The research was conducted from April to November 2015. The study was arranged in a completely randomized block design (CRBD), consisting of five land units as treatment with four replications for each treatment. Biomass of woody plants was estimated using allometric equation, biomass of understorey plants was estimated using plant dry weight equation, and organic C content in plants and soils were analyzed using a Walkey and Black method. The results showed that land unit consisting of densely woody plants significantly affects total biomass of woody plants, organic C content in woody plants and total carbon content (above and below ground). The highest amount of woody plant biomass was observed in land unit 5, i.e. 1,196.88 Mg ha-1, and above ground total carbon was 437.19 Mg ha-1. IFL Faculty of Agriculture University of Lampung has a total carbon stock of 2,051.90 Mg and capacity to take up total CO2 of 6,656.88 Mg

Non-Hydrolytic β-Lactam Antibiotic Fragmentation by l,d-Transpeptidases and Serine β-Lactamase Cysteine Variants

Enzymes often use nucleophilic serine, threonine, and cysteine residues to achieve the same type of reaction; the underlying reasons for this are not understood. While bacterial d,d‐transpeptidases (penicillin‐binding proteins) employ a nucleophilic serine, l,d‐transpeptidases use a nucleophilic cysteine. The covalent complexes formed by l,d‐transpeptidases with some β‐lactam antibiotics undergo non‐hydrolytic fragmentation. This is not usually observed for penicillin‐binding proteins, or for the related serine β‐lactamases. Replacement of the nucleophilic serine of serine β‐lactamases with cysteine yields enzymes which fragment β‐lactams via a similar mechanism as the l,d‐transpeptidases, implying the different reaction outcomes are principally due to the formation of thioester versus ester intermediates. The results highlight fundamental differences in the reactivity of nucleophilic serine and cysteine enzymes, and imply new possibilities for the inhibition of nucleophilic enzymes

Penerapan Model Creative Problem Solving Terhadap Hasil Belajar Siswa Kelas V Sdi Wae Ciu, Kecamatan Lamba Leda Utara, Kabupaten Manggarai Timur

This research was motivated by the problem of students' learning outcomes at SDI Wae Ciu becaused of the use of conventional learning models. The purpose of the study was to describe the comparison of student learning outcomes through the use of the Creative Problem Solving (CPS) model, and also to describe whether using the Creative Problem Solving (CPS) learning model could improve student learning outcomes. This type of research was quantitative research with experimental methods. Experimental research was causal (causation) where its evidence was obtained through comparisons between the experimental group (which was treated) through the use of the Creative Problem Solving (CPS) learning model, and the control group (which was not treated). Data collection techniques was the test to collect data on student learning outcomes. The data analysis technique used was the t-test, after testing the normality and homogeneity. The results showed that the Creative Problem Solving (CPS) model had a positive influence on student learning outcomes. Based on the results of the Paired Samples T-Test analysis, the posttest results obtained in the experimental class and control class were known that the t-count is 0.05 with a significance of 0.000. The significance value (2-tailed) which showed 0.000 > 0.05, then Ho was rejected and Ha was accepted. The Creative Problem Solving (CPS) learning model also determined the accuracy of the expected goals, learning would be effective, efficient and the expected learning outcomes would be achieved. Based on the research that has been done, there was a significant effect on improving student learning outcomes by using the Creative Problem Solving (CPS) learning model. &nbsp

Penerapan Teknik Boundary Value Analysis untuk Pengujian Aplikasi Penjualan Menggunakan Metode Black Box Testing

Sales application is a financial transaction application, if something goes wrong can be detrimental to the owner, buyer, and employee. Then it needs to be tested to ensure the quality of the resulting application. Testing is a verification process for assessing the quality of a software to see whether the software meets the expected process and direction or not. The process that is not optimal can cause inequality of data to be stored in a database. Applications that have been programmed in such a way must go through a process step to ensure the level of quality of the software itself. Examples of processes that can be said to be good if they have a chance of getting an unknown error. Of the several types of Black Box testing methods one of them is Boundary Value Analysis. The method tests the maximum and minimum number of digits to produce a valid value and is easy enough to test sales applications at PT Global Advindo. In the first stage carried out in this study is to identify the functionality to be processed, ensuring the maximum and minimum number of digits matches the specified order. The result of applying the method used is the quality of the software is in accordance with the function, and can be utilized properly by user