bluuebunny/crossref_metadata_2025 huggingface dataset:
The influence of stress state, density and moisture on the dynamic properties of soil cement samples created by the method of deep soil mixing
Authors: Ter-Martirosyan A Z , Sobolev E S
Published: January 2020

The transformation of the properties of the bases by the method of deep soil mixing allows the construction of buildings and structures on sites with soft soils. As a rule, adverse geological conditions are accompanied by the presence of dynamic effects on the designed buildings. The objective of this research is to forecast changes in the mechanical properties of the base under dynamic loads. The object of study is the propagation velocity of elastic shear waves, since these parameters significantly affect the calculations of deformations and stability of earthquake-resistant industrial and civil buildings and structures, as well as objects of energy and transport construction. The paper contains a review of similar studies, on the basis of which the conclusions obtained during the experiments are further generalized. Based on the analysis of the results of laboratory tests performed by the authors of this work, by the method of low-amplitude torsion vibrations in a resonant column in the anisotropic triaxial compression mode, the influence of the density of soil cement samples, humidity, and additional load on the propagation velocity of elastic transverse waves is estimated. The paper provides a description of the essence of the research method, a review of the equipment on which special laboratory tests were performed. The tests were carried out on samples of unbroken soil cement taken from the base of a nuclear power plant (NPP) under construction. Dried samples of soil cement were investigated, and tests were carried out at full water saturation and at a given humidity. The anisotropic stress state of soil cement samples during triaxial tests in a resonance column was due to the features of the base of the designed NPP. Studies have shown that the most significant factor affecting the shear wave velocity is the additional vertical load. It is noted that with increasing density, the velocity of the shear waves decreases. Humidity is directly related to the density of soil cement and the amount of water in the pores, so the assessment of its effect on the dynamic properties of soil cement is similar to the effect of changes in density.
Vibration reduction techniques for Rapid Impulse Compaction (RIC)
Authors: Dobrzycki Przemysław , Kongar-Syuryun Cheynesh , Khairutdinov Albert
Published: January 2020

New investments on anthropogenic soils bring the necessity for reliable and sustainable soil improvement methods. When the fill contains mainly non-cohesive soils and large thickness of material layers is considered, its physical properties can be improved by means of Rapid Impulse Compaction technology. Large energy of every impulse imposed by the mass of the hammer and drop height (with acceleration) makes it possible for relatively fast completion of works but causes large noise and severe vibrations. Environmental impact on adjacent structures may also cause some destruction and form the basis for legal claims. When serious damages appear in neighbouring buildings and structures, complains and claims are inevitable. Reduction of this negative impact may be achieved by means of technology calibration or other active and passive measures. The paper presents the description of that problem, some literature review and a case study describing how the intensity of vibrations may be to some extent reduced by means of hammer drop height reduction and digging a trench around the worksite.
Comparison of assessing the filtration coefficient from laboratory tests with correlation results determined from CPTu test for coarse-grain soil
Authors: Dudek Nikola , Bagińska Irena
Published: January 2020

Filtration coefficient is a basic parameter to assess hydrogeological features of foundation soil and also the material to be built into geoenginering structures. It can be determined from laboratory testing, empirical formulae based on simple laboratory tests, and also from direct or indirect field tests. Each of these method may lead to different values of filtration coefficient. The paper is focused on determining filtration coefficient of coarse-grain soil with several techniques. Direct results from laboratory testing were referred to the indirect evaluation based on grain size analysis and on static sounding CPTu test.
Mechanical and barrier properties of Tapioca/PVA composite films reinforced with pineapple leaf nanocellulose
Authors: Listyarini A , Fauzia V , Imawan C
Published: January 2020

Studies on mechanical and barrier properties of Tapioca/PVA composites reinforced with pineapple leaf nanocellulose have been done to obtain an alternative new biodegradable label for freshness label of smart packaging for food. The aim of this research is to investigate changes of mechanical and barrier properties of Tapioca/PVA/Nanocellulose compared with Tapioca/PVA composite. Composition of Tapioca/PVA was 50:50 with nanocellulose concentration vary from 1, 3, 6 and 10% in composites. Tensile strength and elongation were used to evaluate the mechanical properties of the films. While for water barrier properties was investigated by vapor transmission rate. The microstructure of the films was evaluated by using FT-IR, and SEM. The results showed that increasing the concentration of nanocellulose decreasing the tensile strength and elongation of composites. The concentration of 1% nanocellulose increased the WVTR and in greater amount will reduce the value of WVTR. Addition of nanocellulose decreased the transparency of the composite films. For further application, it can be used as a label for freshness label of smart packaging with the addition of functional material.
Optimization Ratio of Mixed Metal Soaps (Al-Ca) and Palm Fatty Acid Distillate (PFAD) on Making Grease
Authors: Sukmawati  , Lestari P P
Published: January 2020

Palm Fatty Acid Destilate (PFAD) to be used as a raw material for making oleochemical products, solid lubricant. This is caused by the composition of fatty acids contained in PFAD not much different from the composition of fatty acids found in palm oil. This study aims to determine the formulation of solid lubricants (grease) from PFAD and compound metal soap (Al-Ca) as thickener which has characteristics close to SNI solid lubricants and know the quality of solid lubricants produced. The method used in the manufacture of solid grease (grease) consists of two stages. The first stage is the process of making mixed metal soap (Al-Ca) by mixing PFAD and Al(OH)3-Ca(OH)2 and analyzing the mixed metal soap. The second stage is the manufacture of solid lubricants (grease) from mixed metal soap (Al-Ca) and PFAD as well as analyzing the resulting product.

Based on the research that has been done, the optimum solid lubricant obtained according to SNI standards is in the composition of A:B1, A1 is the ratio of Al(OH)3:Ca(OH)2 = 90%:10% and B1 is the ratio of metal soap:PFAD = 90 %:10%, so the density is 0.95gr/ml and the penetration value is 194 (25 °C).
Effect of Temperature on Electrodeposited Nickel Nitride Composite Coatings
Authors: Budi Esmar , Kusumawati Leli , Assita Wahyu Andiani , Indrasari Widyaningrum , Sugihartono Iwan , Teguh Budi Prayitno
Published: January 2020

In the present study, the effect of temperature during electrodeposition of Ni-TiN/Si3N4 composite coatings have been studied. The electrodeposition process was carried out for 15 minutes with a current density of 2.5 mA/cm2. A potensiostat system completed by an electrochemical cell with three electrodes was used for the experiment. Pt wire as the counter electrode, AgCl as the reference electrode and tungsten carbide (WC) as the working electrode. The electrolyte solution used consisted of 0,17 M NiCl2.6H2O, 0,38 M Ni2SO4.6H2O, 6 g/L TiN, 6 g/L AlN, 0,6 g/L Si3N4, 40 g/L H3BO3 and 0,6 g/L Sodium Dodecyl Sulfate (SDS). In this stydy, the temperature variations used were 35°C, 40°C and 45°C. The samples were characterized by using SEM, EDS, XRD and hardness test. The results show that the high electrodeposition temperature produce the smoother morphology and Ni grain refinement and lead to the increase in coating hardness.
The effect of Vanadium Addition on the Characteristics of LaCrO3 nanomaterial
Authors: Situmeang Rudy , Purniasari Lia , Oktavian Harist , Azmi Elsina , Sembiring Simon
Published: January 2020

Lanthanum chromite is a material that plays a large role in the development of fuel cells, catalysts, electronic devices, semiconductors, and magnetics. The application of this compound is determined by the material characteristics. The LaCr1-xVxO3 (where x = 0.01 – 0.03) compound was prepared using a simultaneous method of sol-gel and freeze-drying from salts of chrome, lanthanum, and vanadium in pectin solution. The characterization results using X-ray diffraction, diffuse-reflectance UV-Vis spectrophotometer, and SEM-EDS. X-ray Diffraction analysis showed that the materials formed have the main structure of ABO3 perovskite (such as LaCrO3 and LaVO3) with minor phases of LaVO4 while the band-gap energy of materials due to the addition of vanadium in LaCrO3, it shifts its energy to a lower direction, namely: 2.7; 2.4; 2.6 eV for LaCr1-xVxO3 (where x = 0, 0.01, 0.02, and 0.03) and SEM-EDS micrographs show that the distribution of the crystalline phase is fairly homogeneous, porous and nanorods.
Physicochemical properties of colloidal Ag/PVA nanoparticles synthesized by gamma irradiation
Authors: Wiguna P.A. , Djuhana D. , Imawan C. , Umar A.
Published: January 2020

Silver nanoparticles (Ag NPs) are widely studied because of their superior properties so they are extensively used in various applications. Structural modification with the right synthesis method is the key to obtain superior properties of Ag NPs. In this experiment, gamma irradiation methods have been used to synthesize Ag NPs. The synthesis solution was prepared from a solution of silver metal nitrate salts with a molarity of 10 mM and then mixed in a polyvinyl alcohol (PVA) solution. The irradiation process was carried out in the Cobalt-60 gamma source chamber at a range dose from 0 to 10 kGy with a dose rate of 4.6 kGy/h. This process has caused the solution turns to yellow indicating the formation of Ag/PVA colloidal nanoparticles. The Ag/PVA nanoparticles were characterized using UV-Vis spectrophotometer and Transmission Electron Microscopy. The UV-Vis spectra showed the localized surface plasmon resonance at wavelengths of 420-407 nm. The intensity of the absorption peak increases with increasing gamma dose and reaches a maximum value starting at a dose of 4 kGy. The TEM images showed the shape of Ag NPs is spherical with an average particle size getting bigger with increasing irradiation dose.
Evaluation corrosion behavior on commercial stainless steel SS 304 in Nano fluids water-Al2O3 system at different pH by Electrochemical Impedance Spectroscopy methods
Authors: Djoko Hadi Prajitno , Umar Efrizon , Dani Gustaman Syarif
Published: January 2020

The corrosion behavior on commercial stainless steel SS 304 in Nano fluids water-Al2O3 system at pH 3 until 7 conditions has been investigated using electrochemical methods. The electrochemical tests were performed with and without the addition chlor to adjust of pH Nano fluid condition. The pH of nano fluid for testing corrosion stainless steel 304 are 3.18,.3.65, and 5. 9. The electrochemical technique used in this study, were open circuit potential (OCP), galvanodynamic polarization and electrochemical impedance spectroscopy (EIS). The results of open circuit potential tests showed that the corrosion potential (Ecorr) values of stainless steel 304 in nanofluid at three pH values are slightly different between pH neutral and acidic. At pH 5.9 corrosion potential more positive compare with at acid pH 3.18. The positive potential of corrosion potential at pH 5.9 due to development of chromium oxide (Cr2O3) film formed on stainless steel is more stable in 5.9 than in acidic with the presence of Cl. However, galvanodynamic polarization of stainless steel SS 304 in nanofluid showed that the lowest corrosion of stainless steel SS 304 in nanofluid at pH 5.9 than stainless steel at condition in acidic pH 3.18 and 3.65. EIS study shows that stainless steel SS 304 in nanofluid showed the higher impedance at higher pH than at in acidic condition at lower pH. The higher impedance indicated that the passive film of Cr2O3 formed on the surface of stainless steel and reduce corrosion rate. In terms of corrosion rate values, stainless steel alloy showed the best corrosion rate in low pH nanofluid compared with high pH value. This shows that the interaction between Nano fluids and the stainless steel have no significant effect onto its corrosion behavior.
Optimization of sputtered Au film on grating structure as SERS substrate for detection of pesticide
Authors: Ulum A H , Destarina L , Aminah N S , Srisuai N , Boonruang S , Nuntawong N , Horprathum M , Djamal M
Published: January 2020

Here, we report an efficient approach to optimize the performance of surface enhanced Raman scattering (SERS) substrate. The geometry of the SERS substrate consists of the Au film deposited on polymer grating. The SERS substrate were fabricated by the laser interference lithography (LIL) and magnetron sputtering of Au thin films. The effect of the Au thin film prepared by magnetron sputtering at different deposition time (5-180 s) and operated pressure (3-5 mTorr). The morphology of the obtained samples was observed by field-emission scanning electron microscopy (FE-SEM). The results indicated that optimal SERS substrate with deposition time of 180 s and 3 mTorr-operated pressure was obtained. The limit of detection for methylene blue (MB) and methyl parathion were evaluated at 10-4 M and 10-2 M, respectively. Moreover, our SERS substrate shows the application of a portable Raman spectrophotometer which also promising for on-site pesticide substance detection.
Design Multi Field Electromagnet Based on Copper Plate with Single Electric Current
Authors: Wardoyo Sony , Djamal Mitra , Budiman Maman , Ming Kian
Published: January 2020

The magnetic fields produced by an electromagnet depends on the amount of current and voltage. A single current source can produce multi-field magnetic fields, the position of the solenoid connected to the electric current source, where there are multi connectors that can be switched based on the composition of the helical coil and from the data obtained that this can proved. This research was carried out in a helical and design of copper plates forming solenoid windings, each part of the partition plate numbered 10, 15, 20, and 30 connected to electric currents of 1.5, 3, and 4.5 Ampere and the switch functioned to flow electric current to the partition based on the number of electromagnet plates. The experimental results obtained that the number of plates can produce multi magnetic field with a single current source with a range 0 to 8 mT which is measured using Gaussmeter. The benefits of this research will have impact on physical and engineering research related to the use of electromagnets that are portable and concise but with a single electric current source with multi magnetic fields, besides the next research has the potential to be developed in order to produce high magnetic fields.
Spatial Correlation between Land Surface Properties and Cloud Characteristics in Indonesia
Authors: Tampubolon Togi , Yanti Jeddah , Liu Chian-Yi
Published: January 2020

The change of surface vegetation also links to the evapotranspiration pattern so that the moisture flux might be affected by the atmospheric stratiform or convective clouds, meant to be important in balancing hydrological cycle and the more analysing is necessary to explain this phenomenon. The aim of this paper to analyze the complex phenomenon that link in spatial correlation of cloud response towards land surface change that ensued from cloud microphysical components. Fourteen years from 2003 to 2016 over Indonesia was applied that issued by Moderate-Resolution Imaging Spectroradiometer (MODIS) level-3 (L3) provides both cloud and land surface products. Cloud microphysical features consist of cloud fraction, cloud top pressure, cloud optical thickness, and cloud effective radius, whereas Normalized Difference Vegetation Index (NDVI) was applied to identify the land surface change. The distribution of spatial correlation and probability distribution function are used as the method to determine each cloud microphysical components response to land surface change. Concerning annual result, desirable connections among correlation between NDVI and cloud parameters is rather widely. Probabilistic approach from statistical analysis in the wet season forms palpably pattern (parabolic pattern) rather than a dry season pattern. Correlation values based on spatial analysis between NDVI anomalies and cloud parameter anomalies have a range of values around -0.8 to 0.8. Throughout Indonesia, every correlation between NDVI anomalies and cloud parameter anomalies has a negative correlation. Sumatra, Kalimantan and Papua have a major role to inject negative correlations. This causes this area to be covered with oil palm plantations.
Development of a glass melting furnace with online control systems
Authors: Wongwan W. , Keawkao J. , Boonin K. , Sa-Ardsin W. , Wongwan W.N.
Published: January 2020

In this research, a small glass melting furnace was built with a dimension of 12 x 12 x 9 cm3. The tracking control and notification systems were developed using the Arduino board running through the internet. The 1.2-mm wires were twisted into the 8.3-mm heating coils with the resistance 12.0. When 11.0-A current was applied to the heating coil, the furnace can be operated at maximum heating rate around 5.7 / min. and max continuous operating temperature at 1200. After the test run of this furnace and control system, it was found that this apparatus can be used as a replacement of a traditional one. Furthermore the cost of this furnace is cheaper than a traditional one up to 17 times.
Gravitational Waves in Minkowski Spacetime Background
Authors: Dewi Wulandari , Triyanta
Published: January 2020

One contribution of Einstein’s equation is the existence of gravitational waves. The weak gravitational waves are solutions of the linearized Einstein’s equation around a Minkowski spacetime. By using a certain coordinate freedom, waves propagate at the speed of light and propagating plane waves in z-direction gives two polarization states. The geodesic equation gives an oscillating proper distance of two rest particles when gravitational wave passes, while for proper time, no time dilatation meaning each particle has the same proper time. The fluctuation effect of gravitational waves causes ripples in spacetime making each particle feels a tidal acceleration.
Improvement of Understanding Physics Concept Using Cooperative Model of STAD Type and Mapping Concept Model
Authors: Henry Dinus Hutabarat , Ferawati Artauli Hasibuan
Published: January 2020

Understanding the concept of physics can be influenced by methods used in the learning process. With the cooperative method of type STAD and mapping concept can be seen the level of understanding of physics concept. Both methods are applied to the physics learning process in SMA Negeri 2 Padangsidimpuan class XI semester 2. This test was conducted on two classes with a total of 64 students. This class is divided into control classes and experimental classes. Samples were taken using purposive sampling. From sampling it can be seen that the average pretest on the experimental class is 71.9 and posttets 77.8. So that the average understanding of students who are given an inkuri treatment method is 28.38%. While the average pretets on the control class 65.8 and posttets 72.19. The average increase in the learning outcomes of students given an expository method is 15.02%. Based on test calculation result of t

Count
> t

Table
, or > 1.677. This means Ha
is acceptable, that is, there is a cooperative influence of the STAD type to understand the physics concept of students.
Natural Red Dyes From Hibiscuss sabdariffa L. Calyxes Extract For Gamma-Rays Detector
Authors: Indah Nursyamsi Handayani , Listyarini Arie , Imawan Cuk
Published: January 2020

Detection of absorbed dose in materials were irradiated is one method for monitoring irradiation processes. Dyes that are sensitive to ionizing radiation has the potential to used as radiation detectors. This article will report on the fabrication of gamma-rays detector using natural red dyes obtained from Hibiscus sabdariffa L. (HS) calyxes extract. The HS extract solution was made using a simple extraction method which was carried out by soaking the dried HS calyxes with double distilled water as a solvent for 24 hours. Gammacell irradiator with Cobalt-60 radiation source was used to test the sensitivity of HS extract solution to gamma radiation with a dose of 1-10 kGy. UV-Vis spectrophotometer was used to the characterization of optical properties of HS extract solution. After gamma irradiation, it was observed the color of the HS extract solution faded slightly from dark red to more transparent red color along with increasing doses. The results of UV-Vis characterization showed maximum absorbance of HS extract solution at 523 nm and a decrease in absorbance of 95% after irradiation at a dose of 10 kGy. The HS extract solution is stable in the conditions of storage is not exposed light and at the refrigerator up to 30 days.
The Preventive Effect of Rome Beauty Variety Apple Skin Extract on Blood Urea Nitrogen (BUN) levels of Rat (Rattus norvegicus) Induced by Lead (Pb)
Authors: Nadhrata G E , Pratama D A O A , Haskito A E P
Published: January 2020

Lead (Pb) is a heavy metal that can cause poisoning in living things. Pb contamination that enters the body through the digestive system will bind to erythrocytes and trigger an increase in ROS the body resulting in a decrease in organ function such as the kidneys followed by an increase in levels of BUN. Apple is an example of a fruit that rich in antioxidant. Apple skin contains flavonoids which act as antioxidants and as chelating agent for metal ion. The parameters observed in this study were BUN levels. This study consist of 5 groups with each group consisting of 4 white rats, namely negative control, positive control with 10 mg Pb / head / day of Pb administration for 14 days, and preventive therapy group with Rome Beauty apple skin extract 28 mg/200g, 56 mg/200g, and 112 mg/200g for 21 days and giving lead at a dose of 10 mg/rat/day for 14 days. BUN levels were analyzed using one way ANOVA method which was followed by Turkey. The results showed that the preventive group of apple skin extract of Rome Beauty variety with a dose of 112 mg/200g was able to prevent an increase in BUN levels.
Pathology change of dropsy syndrome in Koi Fish (Cyprinus carpio) at IBAT Punten Batu
Authors: Haryo A , Nurhidayati R
Published: January 2020

Dropsy can be identified from loose scales from the body of a fish. Dropsy fish are having trouble swimming, breathe, and has a bulging belly. Bad water conditions can trigger Dropsy symptom in Koi fish. The method in this examination, make macroscopic observations that are compared with the literature and proceed by making histopathological preparations with daily routine staining which is then observed microscopically. Number of sample is one fish, sampling with a big population. The purpose of this study is to examine macroscopic and microscopic pathological conditions on fish with dropsy syndrome. The organs examined include the gills, skins, and kidney. Pathological changes that occur in these organs are hyperplasia, telangiectasia, dermatitis, and granuloma nephritis. The conclusion of this research, that Koi fish (Cyprinus carpio) positive suspect Dropsy Syndrome.
The effect of ionic silver water (Ag+) toward TNF-α (Tumor Necrosis Factor-α) expression and epidermal thickness in open wound healing rat (Rattus norvegicus) model
Authors: Dewi D P , Purwatiningsih W , Aryani D E , Widodo E , Vidiastuti D
Published: January 2020

Incision wounds are one type of open wounds that occur caused by a sharp instruments such as a result of medical procedure in surgery process. At the time of injury, body will naturally heal that wounds through three phases, inflammation, proliferation, and maturation (remodeling). Ag (silver) solution can accelerate wound healing because it has antibacterial properties and will increase fibroblast cells production. This study aims to determine the effect of Ag (silver) solution based on expression TNF-α (Tumor Necrosis Factor-a) and epidermal thickness in incision wound of the white rat (Rattus norvegicus) Wistar strain. The experimental animals were male white rat Wistar strains weighing 150-250 grams, aged 8-12 weeks divided into 4 groups. Negative control group without treatment. P1 group that is incised and treated by 10%Povidone Iodinewith doses 0,5 ml. P2 group that incised and treated by Ag (silver) solution with doses 0,5 ml. P3 group that incised and treated by combination between 0,5 ml ag (silver) solution and 0,5 mlPovidone Iodine.All treatments was given for seven days. TNF-α expression was measured using the Flowcytometry method and epidermal thickness was observed histopathologically by Haematoxyllen Eosin (HE) staining. Data analysis TNF-α expression was performed by Kruskal Wallis test while epidermal thickness were analyzed by one way ANOVA test and tukey follow-up test with 95% confidence level (α = 0.05). The results of this study showed that combination therapy of Povidone Iodine 10% and Ag solution tends to decrease TNF-α expression and showed increasing cell regeneration of the epidermis in terms of epidermal thickness. The conclusion of this study is that combination therapy can accelerate the wound healing process.
Rush Pin Method For Fracture Os. Femur And Luxatio Reposition Of Caput Femur in A Cat at DNA Animal Clinic Bogor
Authors: Dwirinta M L , Waspada S D , Permanawati  , Satriawan I , Vidiastuti D , Purwatiningsih W
Published: January 2020

Fracture is the severity or destruction of bone continuity and the type of extent that usually caused by trauma. The aim of study was to aplication rush pin for fracture os femur and repocition of luxatio caput femur. Examination methods used to make the diagnose were physical examination, radiography and and cell blood count test. The radiography result showed that transversal fracture distal os. Fermoris and luxatio caput femur, the result of CBC there were no abnormality. Treatment for this case was surgery using the rush pin method to installing intermedulary pins (IM) in condylus os femur. It was used two pins with cross placement. Reposition of luxatio caput femur with simple interupted suture to apotition the caput femur with ligament. After surgery cat was administrated with antibiotic, analgesic, and supplement to support the condition of the cat as post surgery therapy. The conclusion of this study is instalation of pin can repaair transversal fracture os femur, because rush pin keep the bone to right position better than singgle pin and luxatio caput femur was corrected.
Beneficial Effect of Ethanol Extract from Black Rice on Endothelin-1 Expression and Histological Structure of Heart during Pre-eclampsia
Authors: Oktanella Y , Sulistyanigrum I , Aulanni’am  , Oktavianie D A , Firmawati A , Aryani D E , Hendrawan V F , Purwatiningsih W , Vidiastuti D
Published: January 2020

In the case of pre-eclampsia, abnormality form also be found in the heart, which is later can be diagnosed as a particular symptom, hypertension. Endothelin-1, potential vasoconstrictor derived from heart, responsible to the mechanism of indirect impairment utero- spiral arteries into development of generalized endothelial dysfunction. This study was designed to identify the effect of ethanol extract from black rice in pre-eclamptic model rat, specifically related to its ability to maintain physiological activity of cardiovascular system. In this study, animal model was induced by multi-dose of tryponil sulphate 70mg/kgBW at 9th, 10th, 11th day of pregnancy, and the groups were devided into negative and positive control, treatment groups: P1, P2, P3 differed by ethanol extract dosages (12,5mg/kgBW, 25mg/kgBW, 50mg/kgBW respectively). Treatment started from day 12th to 18th of pregnancy, continued by statistical analysis to examined endothelin-1 immunohistochemistry expression using one way ANOVA and Tuckey-Test. This study indicated both the lowest expression of endothelin-1 and the normal structure of heart myofibrils, after histological examination, were identically displayed at P3 (50mg/kgBW ethanol extract) among groups. According to this study, we suggested that the ethanol extract of black rice possibly has certain compound either directly or indirectly induced cardiovascular changes during pre-eclamptic condition.
Preventive potency of sumbawa forest honey on rats exposed by lead acetate based on liver histopathology and AST-ALT level
Authors: Herawati  , Widiarko Olenka P , Permata Fajar S
Published: January 2020

Many cattle are kept in near garbage dump and eat waste product. The cattle will exposure free radical of lead. Sumbawa forest honey contains flavonoids as antioxidant that neutralize the excess free radicals in the body. This research aimed to examine the preventive potency of Sumbawa forest honey toward liver histopathology and AST-ALT level on rats induced by lead acetate. The subject research were rats Wistar, male and age 8-12 weeks. The rats divided in 5 different groups, those were negative control group; positive control group that exposed by lead acetate; and preventive therapy groups with Sumbawa forest honey dose of 25 mg/kgBW, 50 mg/kgBW and 75 mg/kgBW for 28 days and administered with lead acetate dose of 10 mg/day for 14 days. AST-ALT levels were measured by spectrophotometer then analyzed statistically by One Way ANOVA and Tukey test (p<0.05). Liver histopathology was examined descriptively on HE stained. The result showed the forest honey Sumbawa dose 75 mg/kg BW was able to prevent ALT-AST elevation significantly (p<0.05) and reduced the injury of liver tissue on rats exposed lead. The conclusion was the Sumbawa forest honey can be used as a preventative to inhibit the liver injury because of Lead exposure.
Cochran Q-Test for Criteria Validation of PeGI Framework
Authors: Napitupulu Darmawan
Published: January 2020

The research objective is to find out the valid criteria of the PeGI framework in evaluating the application of e-Government in Indonesia. The method used was a survey with the Cochran Q-Test approach involving 5 respondents. The results showed that there were 3 invalid PeGI criteria because the Cochran value was greater than the Chie table so that they were eliminated from the list of criteria thus leaving only 32 valid of PeGI criteria. The implications of the research can provide recommendations for government agencies to use the more relevant PeGI framework.
Wireless X-ray Machine Control Based on Arduino with Kv Parameters
Authors: Wijaya Nur Hudha , Budimansyah  , Sukwono Djoko
Published: January 2020

High voltage (kV) on an X-ray machine is the voltage produced by the High Tension Transformer (HTT) which will give a potential difference to the X-ray machine’s tube. Regional General Hospitals (RSUD) in Indonesia still widely use X-ray machines with analog systems as kV selection. This will result in the radiographer being exposed to radiation continuously when running the X-ray machine because they have to operate the tool directly. The many uses of cables on analog systems are still less efficient, therefore a wireless X-ray machine controller is designed that can reduce radiation exposure to radiographers, and reduce the use of cables on X-ray machines. This study uses Personal Computer (PC) as a place to set parameter values, namely kV. Serial communication using Bluetooth HC-05, minimum system uses ATmega 328p IC and data processing on PC using Delphi application. Measurements on the device use a multimeter to determine the input voltage for HTT. The measurement results of the parameters 60 kV, 65 kV, 70 kV, 75 kV, and 80 kV obtained the smallest correction value is 0.15 kV on the 75 kV parameter and the largest is 1.66 kV on the 65 kV parameter. The correction value is still within the tolerance value range of ± 1kV. In the measurement of distance the farthest results obtained by 6 meters with a barrier wall thickness of 9.5 cm.
News Network Information System On Jepara Hari Ini (Jhi) News Portal Based On Contributor Freelance
Authors: Arifin M , Darmanto E , Arifin M
Published: January 2020

Jepara Hari Ini (JHI) is the center of updated information and news facilities. Info on Jepara politics, sports, education, and tourism that focuses on providing information or news well. However, within the limitations of journalists or reporters sometimes making a news information does not work optimally. With this obstacle, an online news agency requires the input of information or news from outside parties, namely the community. The purpose of this study was to design a news network information system on JHI. The results showed that the news network information system in JHI could help the community in giving or seeing the latest information, database, and interface of the resulting application.
Effect of punch velocity on punch force and burnish height of punched holes in punching procces of pure titanium sheet
Authors: Kurniawan Yani , Mahardika Muslim , Suyitno
Published: January 2020

Punch velocity is one of the important parameters in the punching process. The choice of punch velocity is difficult because it has a different influence on each material. Therefore, it is important to know the effect of punch velocity on the material to be worked. The purpose of this study was to investigate the punch velocity effect on punch force and burnish height of the punched holes in the punching process of pure titanium sheets. The punching process used was a pneumatic punch machine with punch velocity of 10, 35, 70 mm/s. The result shows that when punch velocity of 10, 35, 70 mm/s, punch force that occurred each by 357, 408 and 434 N. Burnish height resulted by 0.194, 0.200 and 0.241 respectively. Its indicates that punch velocity affected on punch force and burnish height of punch holes. When punch velocity increased, punch force and burnish height of the punched holes increased.
Conducting heat treatment of the TiNiTa alloy and studying the mechanical properties depending on the heat treatment
Authors: Sergienko K V , Morozova Ya A , Tsareva A M
Published: January 2020

In this work, a TiNiTa wire with a tantalum content of 10% (weight) was obtained, heat treatment of wire samples was carried out at various temperatures in a vacuum furnace, mechanical tests were carried out after heat treatment to determine the optimal heat treatment mode after the final drawing step to remove hardening and obtain the best complex mechanical properties for the use of wire in the manufacture of medical stents.
Creep of high density polyethylene filled with multiwall carbon nanotubes
Authors: Starkova O , Sevcenko J , Stankevich S , Bulderberga O , Aniskevich A
Published: January 2020

The creep-recovery behaviour of two types of high density polyethylene (HDPE) filled with multiwall carbon nanotubes (MWCNT) is investigated. Nanocomposites with various contents of MWCNT were produced by using a commercially available masterbatch aimed to transfer the gained knowledge to an assessment of properties of industrial-scale products. Nanocomposites are characterized by the improved creep resistance compared to the neat polymers. Incorporation of 10 wt.% of MWCNT into the polymers resulted in a decrease of creep and residual strains for more than 3 and 5 times, respectively. The reinforcing effect of the nanofiller appeared also in a great increase of the elastic modulus (up to 100%) and ultimate strength (up to 60%) as well as a decrease of the coefficient of linear thermal expansion (down to 17%) of HDPE. Carbon nanotubes, being also good heat conductors, greatly contributed to the improvement of polyethylene’s thermal conductivity (up to 60%). Electrical percolation is determined below 2 wt.% of MWCNT. The electrical resistance changes monitored during creep-recovery tests are well correlated with the overall strain changes and residual strains in nanocomposites, that approve their in situ strain sensing capability during inelastic and long-term deformation.
Imprints method for determining the ratio of macro- and microhardness when tested for Vickers hardness
Authors: Adaskin A M , Yu Sapronov I
Published: January 2020

The method has been developed for calculating microhardness values under different loads, with known macro-hardness as well as with macro-hardness and microhardness with a single microhardness value, based on comparing the size of non-recovered and recovered imprints – imprints method (IM). The method correctness test for different materials in a wide range of hardness values –80 … 1500 HV, at different indentation loads, was performed. High accuracy of the developed method is shown.
Study of the contact problem of Bernoulli-Euler nano beams using gradient elasticity theory.
Authors: Apryskin V A , Zhigalov M V
Published: January 2020

A mathematical model of the package for two nano Bernoulli-Euler beams connected through boundary conditions is constructed. Used gradient theory of deformations and the theory of the account of contact interaction of B. Ya. Kantor. The influence of the length dimension parameters on the modes of beam vibrations is studied.
Structural types of graphyne layers formed on the basis of 4-6-12 graphene
Authors: Mavrinskii V V , Belenkov E A
Published: January 2020

The structure of seven new polymorphic varieties of graphyne layers has been calculated using the density functional theory at the generalized gradient approximation. The model of graphyne layers is based on 4-6-12 graphene layer. For graphyne layers the sublimation energy varies in the range from 6.62 to 7.08 eV atom−1, the band gap ranges from 0 to 0.643 eV. The structures of polymorphs of the graphyne are characterized by deformation parameter the value of which correlates well with the sublimation energy.
Numerical experiment with investigation of hydroelastic systems constructions dynamics and strength with according verification
Authors: Kaplunov S M , Vales N G , Dronova E A , Chentsova N A
Published: January 2020

The paper is devoted to the analysis of numerical modeling data exact as it possible to determine hydrodynamic loads on different constructions and objects of the modern energetic machine building with definition of pressure and flow velocities distributions on the surfaces for specified objects and also with special investigation of amplitude-frequency characteristics for the individual construction elements. According to proposed special verification methodical approach it confirms efficiency and correctness of the results obtained by authors. This includes too the application of the main original combined numerical approaches as for calculation process so as for effective verification of these results with support of special experiment analysis and proposed different verification schemes with the cutting of investigation costs. It is really also now that last 10-15 years the role of calculation methods became essentially increased.
Measurement of the strain induced α’ - martensite content by eddy current method in the presence of elastic stresses of austenitic stainless steels
Authors: Klyushnikov V A , Gonchar AV , Mishakin V V , Kurashkin K V
Published: January 2020

The effect of elastic and plastic deformation on the added voltage of eddy current probe under step loading of austenitic steel AISI 321 is investigated. The effect of mechanical stress on the added voltage significantly depends on the amount of residual plastic deformation is shown. This is due to an increase in the volume fraction of the strain induced α' - martensite content. The added voltage decreases at loading in the elastic region. At loading beyond the yield point, the added voltage of eddy current probe increases sharply. Under measuring the strain induced α' - martensite content by eddy current method it is necessary to take into account the influence of mechanical stresses is shown. An algorithm is proposed to reduce the measurement error of the magnetic phase fraction by taking into account the stress-strain state of the material.
Effect of electrospinning solution parameters on the properties of nonvolven fibrous material based on polyhydroxibutyrate
Authors: Olkhov A A , Staroverova O V , Kuherenko E L , Iordanskii A L
Published: January 2020

In the present work, the influence of technological parameters of poly-3-hydroxybutyrate solution on the process of electrospinning of ultrathin fibers has been studied. It was established that the electrical conductivity and viscosity of the polymer solution largely determine the geometry and morphology of ultrathin fibers. Modification of solutions with ionic electrolyte and hydrolytic agent reduces the initial molecular weight of the polymer and leads to an increase in the viscosity of the system. It’s shown that the inputting of CNT leads to theorientation of the polymer macrochains in the amorphous phase. As a result, there are increases in mechanical, sorption properties and resistance to oxidative, thermal-oxidative and hydrolytic degradation. The fibers obtained will find application in biomedicine.
Novel approaches in manufacturing of multicomponent metallic binders for diamond cutting tools
Authors: Loginov P A , Sidorenko D A , Vorotilo S. , Levashov E A
Published: January 2020

In this study, three approaches for the diamond cutting tool binder improvement are shown. They allow to reinforce the binders and enhance their wear resistance, thus making diamond grain retention in the working layer of the tool more reliable. Mechanical alloying methos was used to obtain a homogeneous and nanocrystalline structure of the powder binders. It increases the bending strength of iron- and copper-based binders by 60-100 %, to 2500 and 1200 MPa, respectively. The positive effects achieved by adding different types of nanoparticles are summed up during hybrid modification of the binders. It has been verified, both theoretically and experimentally, that hybrid modification with WC and hBN nanoparticles, as well as carbon nanotubes, simultaneously increases binder strength by 20% and improves binder wear resistance during machining of abrasive materials threefold. Doping iron-based binders with adhesively active elements (titanium, chromium, etc.) enhances the diamond retention capacity due to formation of carbide interlayers at the metal–binder interface.
The effect of various factors on the strength and ignition of the used Ni-Al system
Authors: Seropyan S A , Saikov I V , Salamatov V G , Alymov M I
Published: January 2020

The aim of this work was to obtain structural reactive materials from high-energy mixtures. The effect of various additives on the parameters of the burning rate and the ignition temperature was studied. The object of the study was a powder mixture based on nickel and aluminum in a stoichiometric ratio with a particle size of less than 50 microns. Boron and tungsten fibers were used as reinforcing and energy elements. Mixtures of powders were compacted to a relative density of 0.7 and 0.8. Specimens were made in the form of a parallelepiped. The strength of the samples was studied using three-point bending. It was possible to increase the initial strength of the samples by 9 times when reinforced with tungsten fibers.
Effect of temperature fields and bottom sediments of oil products on the stress-strain state of the design of a vertical steel tank
Authors: Sultanbekov R R , Terekhin R D , Nazarova M N
Published: January 2020

Tanks for storing oil and oil products during operation are exposed to a combination of external, static, low-cycle, temperature, snow and wind loads, bottom sediments, etc., which leads to a decrease in operational reliability and a decrease in the durability of tank structures. Numerical modeling methods, in contrast to standard methods for calculating strength and stability, allow us to create an adequate finite element model at the stage of development of a geometric model. This article describes the analysis of the stress-strain state of the tank taking into account bottom sediments of oil products and the influence of the temperature of the oil product and the environment using the Ansys software package. Based on the analysis of the stress-strain state using finite element modeling on the example of a vertical steel tank, it was shown that the stresses in the zone of the miter weld, as well as in the places of installation of the receiving-distributing branch pipe and the manhole, are maximum. It is in these zones that the influence of bottom sediment and temperature is significant, since they form local elevated stress zones, which increase significantly when the walls are thinned.
Mechanical properties and fractographic analysis of the Ti49.14Ni50.86 alloy in a coarse-grained state during multiple martensitic transformations
Authors: Churakova A A , Kayumova E M
Published: January 2020

The mechanical behavior of the coarse-grained Ti49.14Ni50.86 alloy after multiple martensitic transformations B2-B19’ was investigated. A fractographic analysis of the samples after mechanical tests was carried out. The fracture pattern of the Ti49.14Ni50.86 alloy in the coarse-grained state has a viscous and heterogeneous character with microdepths on the fracture surface, the average size of which decreases as the number of thermal cycles increases.
Fatigue life of damaged rails
Authors: Shur E A , Borts A I , Bazanova L V
Published: January 2020

Experimental studies of the residual static strength of rails with transverse cracks in the head are carried out. The transverse cracks were detected by means of flaw detection in railway track. The average values of the relative area of the crack and the breaking load are determined. In order to verify mathematical models for determining the residual life cycle of rails with cracks in the head, a methodology for fractographic estimation of the speed and duration of fatigue crack propagation has been developed. The methodology was developed on the basis of fractographic analysis and studies of macroline fatigue in a crack that developed in a rail on a single-track section with a regular change in the direction of train movement. A linear part of the graphic dependence of the crack growth rate on the maximum value of stress intensity factors (Paris diagram) for rails under real operating conditions was calculated.
Synchronized cell balancing charging of supercapacitors using PI control
Authors: Rashed M.A , Fahmi M I , Azizan M M , wai C L , Zhe L W , Rosle N F
Published: January 2020

This paper covers the synchronized cell balancing charging of supercapacitors using pi control. The main objective of this project is to design a balanced circuit for supercapacitor and balance the voltage for each supercapacitor in series using pi control. This project aims to introduce a switch resistor design for a supercapacitor to balance the cell. Due to its low cost, easy to implement, and charge/discharge, the switch resistor design was chosen as the balanced circuit. The switch resistor design process was accomplished taking into account all the calculation for the design parameters. Using the pi control given to the circuit the stability and balancing in the voltage. The pi control design process was accomplished with the calculation for the design parameters.