SOIL IMPROVEMENT METHODS USING MINIPILE FOR REDUCING SETTLEMENT VALUE IN HIGHWAY TOLL KERTOSONO – KEDIRI

A highway toll project is an urgent need in this modernization era, especially in our country, which currently has a population of around 250 million people. From the population that has been increasing, In the current era the need for transportation is also growing rapidly, Therefore, a safe and comfortable transportation is needed. Relationship with the occurred of soft soil in the STA. 18 + 000 to STA. 20 + 300, the authors need to provide an analyzing way of handling the soft soil in order to meet the criteria for the settlement criteria. Meanwhile, the purpose of making analysis soft soil improvement using minipile is to find out a technical point still meets the requirements stated in the design criteria. To achieve this goal, analysis of the soft soil improvement in carrying out the analysis and calculations was taken from the results analysis of the N-SPT value and laboratory testing material from the soil investigation of the borehole. The calculation results obtained are in the soil improvement methods at the location which was originally using a minipile it can reduce settlement value < 20 mm/years, safety factor in earthquake condition > 1.10 and time schedule for implementation pilling work on site 1 month faster than the time required when using another methods for each location that has of soft soil content, especially in the section STA. 18 + 000 to STA. 20 + 300.

The Development of an Online Guided Inquiry-based Biology Practicum Guide Using the Geschool Application for Students Grade XI

The problem faced in the world of education is the weakness of the learning process, that is, students are not encouraged to develop thinking skills. This affects their understanding and skills in the learning process. Practical activities are laboratory activities that are an integral part of learning biology. The implementation of practicum activities in XI MAN 2 Pesisir Selatan was not optimal. This is due to the unavailability of practical guides and pandemic conditions which have resulted in practicum activities: not being able to be carried out in schools. This research aims to develop an online guided inquiry-based biology practicum guide by using the Geschool Application. The application of guided inquiry in learning allows students to have the opportunity to broaden their knowledge and help develop conceptual understanding. This research is a developmental research using the Plomp model. The object of this research was the students Grade XI MAN 2 Pesisir Selatan. The sample was taken by using a random sampling technique. The material developed was the transport substance and food testing material. The results showed that the practicum guide developed met the criteria of validity, practicality, and effectiveness. Inquiry learning is a learning strategy that emphasizes the development of the cognitive, affective, and psychomotoraspects in a balanced manner.

Investigation of the effect of nanomaterials on the process of germination of corn

The purpose of the research was to identify the nature of the effect of carbon nanomaterials on seedlings of plants. The work used biological methods, in particular biotesting. The corn produced in Kazakhstan was used as testing material. For this several soil samples containing carbon, nanomaterials were prepared. In the experiment, we have monitored the growth of the seeds planted directly to soil samples. According to the results of the study, it became evident that carbon nanomaterials in the form of nanotubes applied to the deposited material, due to their properties, stimulate the growth of plants during the process. This explains the wide range of applications of carbon nanomaterials.

Optimum Tick Collection Material and Design for Autonomous Tick Collection Robot

This paper discusses the design and testing material utilized to collect ticks from rugged terrain in remote areas via a mobile robot using a mast system, focusing on locating the ideal design and material to ensure maximum tick collection without impacting mobility. Drags are used to collect ticks from short grass, and flags, in the air along the side of the robot, are used to collect ticks from tall grass and shrubs. The design was tested in the field and a laboratory. Cotton and sponge cloth materials were evaluated, along with the shape of the material. The optimum design uses strips of rough sponge cloth to collect ticks. The roughness and fibrous nature of the material increase the number of ticks collected and performed the best of all materials tested. Seams in the sponge cloth allow them to tear away from the robot, if they become tangled in brush, to prevent the robot from being incapacitated. The thickness and weight of the sponge cloth also discourage the material from knotting and entangling with the robot or the environment. The flag attachment points are adjustable horizontally to allow the rearrangement of strips for optimum tick collection. Each strip is designed for independent removal to contain ticks easily and replace strips quickly. Attaching sponge cloth flagging and dragging strips to a mobile robot for tick collection protects humans from a potential illness from bugs and insects carrying disease pathogens, injury from traveling across rough ground, and harm due to exposure to the elements; productivity is also increased. The collection strips should capture ticks despite adverse conditions, be easily interchangeable, and not hinder the tick collection and removal process.

Squeeze Flow of a Newtonian Fluid under Different Test Speeds

In this paper, the squeeze flow behavior of Newtonian fluid was investigated with a series of squeeze tack laboratory experiments. The Newtonian fluid was squeezed out radially between two parallel and circular plates. From the flow curves obtained in the squeeze tack experiments, rheological parameters such as yield stress in tension and in squeeze, have been investigated. The results indicate that the values of yield stress in squeeze and in tack of the testing material are relatively small. These values gradually decrease with increasing sample thickness. This shows that the squeezing and tacking process does not affect the testing material, glucose in this case. Although the experimental results are not much, a linear relationship can be found between tensile and squeeze stress of Newton fluid in the experiment. This is especially evident at low test speeds

Studi Eksperimental Dan Analisis Elemen Rangka Atap Baja Ringan Komposit Aplus Casting Plaster Pada Batang Tekan

Tekuk merupakan fenomena yang terjadi jika batang memperoleh gaya tekan. Tekuk perlu dihindari agar tidak terjadi kegagalan struktur bangunan. Rangka atap baja ringan merupakan salah satu struktur bangunan yang beresiko tinggi terjadinya tekuk, yang disebabkan karena material yang sangat tipis. Salah satu alternatif untuk meningkatkan tekuk pada rangka baja ringan adalah penggabungan material baru atau yang disebut material komposit. Aplus casting plaster salah satu alternatif material tambahan yang bisa meningkatkan batang kuat terhadap tekuk. Kandungan bahan yang ada pada material tersebut adalah calcium sulfate hemihidrate dan cristaline silica. Material ini bisa diperoleh dipasaran sebagai bahan pembuatan lis plafon. Pada penelitian ini ingin mengetahui beban maksimum dan pola keruntuhan elemen batang komposit dan non komposit pada rangka baja ringan. Jumlah sample masing-masing 18 elemen batang komposit dan non komposit dengan panjang elemen batang masing-masing 400mm, 600mm, 800mm, 1000mm, 1200mm dan 1400mm. Metoda analisis menggunakan SNI 7971-2013 untuk material non komposit dan SNI 1729-2015 untuk material komposit, sedangkan metoda eksperimental dilakukan dengan uji tekan menggunakan alat UTM (Universal Testing Material) dengan pembebanan bertahap sampai elemen batang mengalami keruntuhan. Hasil penelitian menunjukan bahwa elemen batang komposit memiliki kekuatan yang lebih tinggi dari elemen batang non komposit antara 48.35% sampai dengan 108.96% dengan pola keruntuhan yang terjadi tekuk lentur untuk semua elemen batang non komposit dan tekuk lokal pada sebagian elemen batang komposit kecuali pada panjang elemen batang 1200mm dan 1400mm terjadi tekuk lentur.

Analisis Pengaruh Temperatur Pirolisis terhadap Kualitas Bahan Bakar Minyak dari Limbah Plastik Polipropilena

Penelitian ini bertujuan untuk mengetahui pengaruh temperatur pirolisis terhadap kualitas fuel-oil dari limbah Polipropilena. Metode yang digunakan adalah pirolisis cepat (fast-pirolisis) tanpa menggunakan katalis. Analisis fisis yang dilakukan meliputi: densitas, viskositas, dan nilai kalor. Limbah plastik Polipropilena dipirolisis dengan temperatur 450 oC, 500 oC dan 550 oC. Hasil analisis menunjukkan bahwa semua profil temperatur memenuhi standar bbm konvensional yang menyerupai BBM konvensional jenis bensin. Pada masing-masing temperatur pirolisis 450, 500 dan 550 °C diperoleh berturut-turut: rendemen 16; 64 ; 70 %; viskositas 0,76; 0,92; 1,12 cP, densitas 0,750; 0,764; 0.756 gr/ml dan nilai kalornya 11.388; 11.316; 11.356 kkal/kg. Berdasarkan analisis yang telah dilakukan bahan bakar minyak hasil pirolisis limbah plastik polipropilena dapat digunakan sebagai pengganti bahan bakar konvensional karena sudah memenuhi standar karakteristik bahan bakar sesuai American Standard and Testing Material (ASTM).