scholarly journals Redesign Mata Bor Tanah Untuk Pembuatan Lubang Biopori Di Desa Puron, Kecamatan Bulu, Kabupaten Sukoharjo

2020 ◽  
Vol 19 (2) ◽  
pp. 60
Author(s):  
Zainal Arifin ◽  
Dominicus Danardono Dwi Prija Tjahjana ◽  
Rendy Adhi Rachmanto ◽  
Suyitno Suyitno ◽  
Singgih Dwi Prasetyo ◽  
...  
Keyword(s):  
Maximum Stress ◽  
Reaction Force ◽  
Drill Bit ◽  
Soil Environment ◽  
Software Application ◽  
Drill Bits ◽  
Catchment Areas ◽  
Quality Product ◽  
Steel Cast

<p><em>The lack of rainfall and the absence of catchment areas are the main factors of the lack of water in Puron Village. Making biopori becomes solutive because it is useful for water absorption, reducing standing water, composting containers, and fertilizing the soil. Artificial biopores are made by making holes in the ground using tools such as crowbars or using ground drilling machines. The use of aids model adapted to the drill bit based on the state of the soil contour. This research is focused on classifying drill bits and redesigning which is in accordance with the condition of the soil environment in Puron Village, Bulu District, Sukoharjo Regency. So that biopori holes can be created more effectively and efficiently. The research method was carried out through the classification of tool drill bits through the house of quality product (HOQ) and redesign using Autodesk Fusion 360 software application. It was found that the design with a screw drill model with a pointed spiral has a high product quality value and can applied in puron Village. The design of the drill bit by adjusting the contours of the Puron Village can make a 100 mm diameter biopori hole. The design specifications of the drill bit with steel cast with 12 spiral plates with a length of 1300 mm with a diameter of 115 mm can be driven with a 10 HP engine. The design results have maximum stress, displacement, reaction force and strain of 3.62 MPa, 0.00081 mm, 0.35 N, and 0.000015.</em></p>

The effects of intensive rainfalls (flash floods) on the development on the landforms in the Kőszeg Mountains (Hungary)

2012 ◽  
Vol 4 (1) ◽  
Author(s):  
Márton Veress ◽  
István Németh ◽  
Roland Schläffer
Keyword(s):  
Catchment Area ◽  
Flash Floods ◽  
Steep Slope ◽  
High Density ◽  
Alluvial Fans ◽  
Channel Changes ◽  
Great Thickness ◽  
Superficial Deposit ◽  
Catchment Areas

AbstractThe effects of the intensive rainfall episodes in the years 2009 and 2010 in the Kőszeg Mountains were investigated. Channel profiles were constructed at various times during these periods, which were used to describe the channel changes. We measured the length of the incised and filled sections on multiple occasions. We could establish the degree and the direction of the changes using this data. The sediment veneer that developed in the area of Kőszeg town was mapped and its conditions of development were examined. The erosion and accumulation landforms developed during these years were classified and described. These forms are the following: rills, gullies, alluvial fans and sediment veneer. We distinguished and characterised those which had previously formed, but they were changed or increased (the channels). We established the conditions under which the sediment veneer can develop, furthermore those conditions which can increase the chance of the formation of this landform. These conditions are the following: the high density of roads in the catchment areas of valleys leading to settlements, the great thickness of superficial deposit, and the steep slope of the surface of the catchment area. We created theoretical classification of the morphological environment where the development of sediment veneer may happen and identified settlements with structures which promote or prevent the development of the sediment veneer. We determined the probability of the development of the sediment veneer at some settlements in Kőszeg, and suggestions have been given to decrease the chance of the development of this sediment veneer.

THEORETICAL STUDIES OF THE VELOCITIES OF THE VIBRATIONS OF DRILL BITS WOODWORKING DRILLING MACHINES

Akustika ◽  
2021 ◽  
pp. 124
Author(s):  
Dmitry Ruslyakov
Keyword(s):  
Sound Pressure ◽  
Natural Frequencies ◽  
Theoretical Studies ◽  
Drill Bit ◽  
Acoustic Models ◽  
Drill Bits ◽  
Sound Pressure Levels ◽  
O 10 ◽  
Noise Spectra

On woodworking machines of the drilling group, drill bits of the following diameters (mm) are used at rotation speeds: SvP2 and SvA-2-ø 50 mm, n = 3000 rpm 4500 rpm; Sv8, Sv12-ø 10-16 mm, n = 2800 rpm; SGVP-ø up to 35 mm, n = 2800 rpm. Acoustic models are described in detail in [1] as can be seen from the analytical dependences of sound pressure levels to calculate the noise spectra, it is necessary to determine the oscillation velocities of the drill bit at their natural frequencies.

scholarly journals The vulnerability analysis of catchment areas using rapid assessment method (case study in Universitas Indonesia, Depok)

2018 ◽  
Vol 192 ◽  
pp. 02033
Author(s):  
Eva Rolia ◽  
Dwita Sutjiningsih ◽  
Fitria Fitria
Keyword(s):  
Catchment Area ◽  
Rapid Assessment ◽  
Buffer Zone ◽  
Assessment Method ◽  
Rapid Assessment Method ◽  
Catchment Areas ◽  
High Level ◽  
Initial Classification

Catchment area of aquatic system in Universitas Indonesia (UI) campus has a function as groundwater recharge for Depok area, which is the buffer zone of Jakarta. This catchment area has high level of imperviousness as a consequence of increasing population. The high imperviousness implicates in the degradation of the catchment area health. For that reason, the vulnerability assessment of UI catchment area is needed to arrange of restoration recommendation. This research applies Rapid Assessment Method which implements eco-hydrological concepts including aquatic and riparian condition as well as imperviousness of catchment area. Locations of the research are Kenanga and Agathis catchments area. The result of initial classification based imperviousness both catchment areas are categorised as Non-Supporting, where the imperviousness of Kenanga and Agathis is 31,0% and 77,18% respectivelly. Based on the assessment on aquatic and riparian condition as well as future land use, the final classification of both catchment areas is Restorable Non-Supporting catchment area.

scholarly journals Quality Improvement of Iron Ore Jasper by Selective Milling

2017 ◽  
Vol 7 (1) ◽  
pp. 10
Author(s):  
Erivelto Luis de Souza ◽  
Orimar Batista Dos Reis ◽  
Denise Fonseca Pereira
Keyword(s):  
Power Consumption ◽  
Iron Ore ◽  
Consumption Rate ◽  
High Hardness ◽  
Silica Content ◽  
Work Index ◽  
Acceptable Quality ◽  
Quality Product

One of the most important factors during the process of comminution of minerals is their power consumption rate, which is determined by calculating the WI (work index), which in short is to analyze the amount of kWh consumed per ton of material, to reach a certain particle size and achieve the desired. Along with the quality of the ore is defined and use the classification of the ore. Ores of jaspelite type, high hardness, and with lower iron content 60% with silica content above 10.5%, tends to be considered economically unsuitable for merger cases in the Brazilian market. The work presented here consists of a technique that acts by transforming this type of ore at an acceptable quality product and with a lower power consumption than the previously calculated by WI analysis. The procedure presented here recovers a quantity of more than 75% by weight, taking an ore 56% Fe, for an average content of 65% SiO2 and lowering the 10% to 4.5%. Although reducing by 50% the amount of phosphorus present. The procedure presented here using known methods, but with a variation with respect to the operation, which gives you innovative character, acting together with a selective screening.

Loading of bearing retaining pin of tricone drill bit

2020 ◽  
pp. 64-67
Author(s):  
D. I. Simisinov ◽  
◽  
A. I. Afanasiev ◽  
V. S. Shestakov ◽  
N. G. Valiev ◽  
...  
Keyword(s):  
Strain Analysis ◽  
Physical And Mechanical Properties ◽  
Contact Stresses ◽  
Drill Bit ◽  
Ministry Of Education ◽  
Drill Bits ◽  
Bending Loads ◽  
Bearing Assembly ◽  
Engineering Changes ◽  
Cone Drill

Improvement of cone drill bit design is an engineering challenge as it is connected with considerable energy to be transferred via the drill to well bottom in the limited well space. In such conditions, it is difficult to create a full-size bearing assembly, including bearings and lubricating devices, as well as the sufficiently efficient cutting structure of the bits. Moreover, the condition of equal lives of the cutting structure and the bearing assembly is to be fulfilled. The operating practice of tricone drill bits in shothole drilling reveals their low serviceability. The life of a bit ranges from a few hours to a few days subject to physical and mechanical properties of rocks. The main cause of bit failure is damage of the retaining pin shoulder rivet under high contact stresses. Aimed at improvement of cone drill bit design and justification of engineering changes, the stress–strain analysis of the bearing retaining pint is performed, and it is found that the pin shoulder rivet experiences essential contact stresses and bending loads. It is proposed to equip cone drill bits with circulation lubrication system for the bearing assembly. Lubrication improvement can ensure reduction in loading of the bearing assembly components and, consequently, provide higher durability and wear resistance of these parts. The study was supported by the Ministry of Education and Science of Russia according to the state contract with the Ural State Mining University, Contract No. 0833-2020-0007.

Failure Behaviour of Semantan Bamboo Strips Loaded in Bending and Shear

2011 ◽  
Vol 462-463 ◽  
pp. 1176-1181
Author(s):  
Shahril Anuar Bahari ◽  
Mansur Ahmad
Keyword(s):  
Mechanical Properties ◽  
Microscopic Observation ◽  
Maximum Stress ◽  
Failure Modes ◽  
Vascular Bundles ◽  
Failure Behaviour ◽  
Modes Of Failure ◽  
Different Parts

In this study, the classification of modes of failure, the observation of microscopic failures and the mechanical properties of Semantan bamboo strips were investigated. Specimens were loaded in bending and shear parallel to grain. Specimens were taken from internodes and node parts in bottom, middle and top portions of bamboo culms. From the classification, different modes of failure occurred in different parts of Semantan bamboo culms loaded in bending and shear. From the microscopic observation, the failures occurred in both parenchyma and vascular bundles regions for all classified failure modes from all tests, except for Even Splitting Mode from shear. This mode exhibited failure in parenchyma only, without any failure in vascular bundles regions. The Maximum Stress (σml) values between failure modes for both tests were significantly different. Generally, anatomical behaviour at different culm’s parts had influenced the different modes of failure and microscopic failures of Semantan bamboo strips loaded in bending and shear.

Sign in / Sign up

Export Citation Format

Share Document