bluuebunny/crossref_metadata_2025 huggingface dataset:
Comparison of Full-Area Simulation Method and Separated Simulation Method of Motor Temperature Field
Authors: Wang Wenjie , Suo Shuangfu , Hao Jinshun , Wang Yang
Published: November 2019

Permanent magnet motor has become the main research direction of high power density motor, and the heat dissipation capability of the motor has become an important factor restricting the increase of motor power density. High-power density motor generates higher temperature when it works, and high temperature may cause motor insulation burnout, even irreversible demagnetization of permanent magnets. Therefore, thermal analysis and optimal design of cooling structure are very important for high power density motors. In this paper, a 3-D model of thermal simulation of permanent magnet motor is established, and the temperature field is calculated by two methods. 1. The fluid-solid coupling method is used to calculate the global temperature field of the motor and the cooling structure. 2. The fluid-solid coupling method is used to calculate the convective heat transfer coefficient of the cooling structure, then the heat transfer model is used to calculate the temperature field of the motor body. These two methods are introduced and compared in this paper, and the second method is considered to be well suited for optimal design of motor cooling structures.
Seismic Performance Analysis of Highway Subgrade Retaining Structure
Authors: Lin Tao , Li Jinbei , Zhang Yang
Published: November 2019

Subgrade retaining structure is the most common structure of highway, once it is damaged by earthquake, its damage is universal. Under the action of seismic load, whether the subgrade retaining structure cracks or collapses, and the failure mechanism is one of the key problems in the design of retaining structure in earthquake area. Therefore, it is necessary to systematically study the typical failure mode, failure mechanism and seismic earth pressure of highway retaining structures. In this paper, through the investigation and analysis of earthquake damage law and failure mode of highway retaining structure, combined with numerical model test, the seismic damage mode of highway retaining structure is summarized, and effective seismic reinforcement method is put forward, which provides a certain basis for post-disaster reconstruction of highway structure.
Research on Improving the Success Rate of Electricity Information Acquisition System by Using Medium Voltage Power Line Carrier Communication Technology
Authors: Kang Liyan , Shang Ying , Zhang Muxin , Liu Xinran , Wu Xiaoguang
Published: November 2019

This paper studies the application of medium voltage power line carrier in Electricity Information Acquisition System, discusses the main application scenarios of medium voltage power line carrier, compares three upstream communication modes of medium voltage power line carrier, optical fiber and wireless public network, and summarizes the investment cost, construction and maintenance of medium voltage power line carrier. The field operation proves that the medium voltage carrier communication technology can improve the success rate of Electricity Information Acquisition System.
A small-size and multi-band wearable antenna with coplanar structure
Authors: Jin Xinghui , Zhu Mingmin , Wei Wenjiao , Yu Guoliang , Zhou Haomiao
Published: November 2019

A small-size multi-band wearable antenna with coplanar coupling of radiation patch and ground plane for 4G mobile communication is proposed and discussed in this paper. A coupling strip, a C-shaped slot made of copper foil and a shorting strip are combined to form the proposed wearable antenna with a simple structure and small size of 25×32 mm2. The proposed antenna operates over two frequency ranges, 2308-2841 MHz and 5092-5887 MHz suitable for LTE 2300/2500 MHz, WLAN 2.4/5.2 GHz and ISM 5.8 GHz applications. In addition, the proposed antenna has better stability and it also can cover five frequency bands when the curvature radius is 45 mm and 25 mm in comparison with traditional conductive fabric wearable antennas. The designed antenna is easy to fabricated, small in volume and wide in frequency band that is applicable to most wearable electronic devices in the future.
Functional Location Analysis of Inertia Support and Primary Frequency Modulation of Virtual Synchronous Generator in Power System
Authors: Han Zijiao , Ge Yanfeng , Li Zhengwen , Wang Chenqi , Wang baoshi , Wei Jiapeng
Published: November 2019

With the continuous improvement of renewable energy penetration, the inertia and primary frequency modulation capability of synchronous power grid are declining. If the virtual synchronous generator (VSG) technology is used for renewable energy generation, it can make due contribution to reducing the frequency variation and frequency deviation of the system under the impact of high power gap. The inertia support and primary frequency modulation function positioning in VSG research are not clear. In this paper, the inertia support function of VSG and its physical significance are analyzed, the expression of inertia support power of VSG is deduced, the location distinction between inertia support function of VSG and primary frequency modulation function is analyzed, and the different control function pairs of VSG in the process of large synchronous power grid frequency accident are simulated and analyzed,and study the effect of system frequency variation.
Mobile Digital TV Induction Array Four Helix Antenna
Authors: Pan Yilang , Li Zhenchang , Tang Di , Yan Yipeng , Chen Linpeng , Li Huiru
Published: November 2019

According to the performance requirements of the mobile digital TV system, the present paper originally combines polygonal four helix antenna, induction array antenna, dielectric constant gradient film, graphene conductive ink and nano silver conductive ink, designed a mobile digital TV inductive array four helix antenna. The result of test indicates that this antenna has completely covered the frequency band of the mobile digital TV system. This antenna has strong corrosion resistance and damage resistance, stable physical and mechanical performance and radiation performance, small size, thin thickness and large working bandwidth, so it has broad application prospects.
Design of Broadband Micro-Power Wireless Communication Test System Based on TTCN-3
Authors: Tian Le , Chang Suhua
Published: November 2019

In order to optimize the network architecture, narrowband micro-power wireless communication technology is developing towards broadband. In order to ensure the conformance of the functions and protocol standards of the developed broadband micro-power wireless communication module and the interconnection of different manufacturers, it is particularly important to test the products. Based on TTCN-3 and Titan platform, a conformance testing system for broadband micro-power wireless communication protocol is designed. The hardware and software implementation scheme of the conformance testing system is given, and the implementation mechanism and key technologies of each part of the system are described. An interoperability testing platform is constructed to realize the integrated distribution network testing and interoperability testing. Protocol conformance testing cases are designed by using black box testing method. It provides a test basis for the research of broadband micro-power wireless communication.
Study on Outdoor Terminal Box Moisture-proof Measures
Authors: Feng Lei , Wang Zhen
Published: November 2019

The paper analyzes the components of outdoor terminal box, and studies the mechanism of outdoor terminal box moisturizing according to the relationship between temperature and humidity, and proposes the main ideas of moisture-proof outdoor terminal box. Through wide range of investigation, the paper teases out the current moisture-proof measures of outdoor terminal box and analyzes the effect of each measure according to the actual operation. By counting the damp defects of outdoor terminal box, the paper analyzes the hidden danger of outdoor terminal box moisturizing and the reasons why the frequency of some terminal boxes moisturizing is high. Finally the paper proposes some advice for moisture-proof measures of outdoor terminal box in southern area.
Reduced-Dimension DOA and Polarization Parameters Joint Estimation Method for Electromagnetic Vector Sensor Array
Authors: Fu Xinying , Wan Tao , Wang Shixin
Published: November 2019

MUSIC algorithm is a very typical algorithm in the joint estimation of DOA and polarization parameters. But the two spectral peak searches of two-dimensional parameter space in the algorithm cause a damaging effect on calculation, which limits the application of the algorithm in practice. Therefore, this paper proposes a joint estimation algorithm of dimensionality reduction DOA and polarization parameters based on successive MUSIC in the case of uniform linear array arrangement of the electromagnetic vector sensor. The proposed algorithm improves the classical MUSIC algorithm from two two-dimensional parameter searches to four one-dimensional parameter searches in the joint estimation of DOA and polarization parameters, which greatly reduces the computational complexity of the algorithm and can lead to the automatic matching of DOA and polarization parameters. Simulation results show that the computational complexity of the proposed algorithm is reduced by 104 orders of magnitude compared to the classical MUSIC algorithm. And the performance of the polarization parameter estimation of this algorithm is about 72%∼85% higher than that of the ESPRIT algorithm. Therefore, the algorithm is more applicable.
A Design of Ultra-low Phase Noise Frequency Source Based on High Phase Detection Frequency
Authors: Geng Dong , Liu YingKun , Guo WengSheng , Zhang JiaCheng , Zhang XueRen
Published: November 2019

This paper introduces a design of ultra-low phase noise frequency source based on high phase detection frequency. Frequency source is a very important part of modern electronic system. Radar, communication, space technology and so on are inseparable from frequency source. Its performance index directly affects the whole electronic system, and phase noise is one of the most important indicators. In this paper, the scheme of phase-locked technology with high phase detection is mainly used,the phase noise is better than -116dBc/Hz@1kHz, -120dBc/Hz@10kHz, -121dBc/Hz@100kHz when the output frequency is 4.5GHz. The technology of high phase discrimination and low phase noise frequency synthesis in this paper can also be extended to higher and more special frequency bands. It provides a solution of ultra-low phase noise for frequency sources of modern radar, electronic jamming and countermeasure systems.
A 5-15GHz Switchless Broadband Monolithic Integrated Bidirectional Amplifier
Authors: Wang Mengtan , Yao Zhihong , Xu Yongxiang
Published: November 2019

Based on SiGe HBT technology, two broadband monolithic integrated bidirectional amplifiers (BDA) with different operating voltages (1.8V/3.3V) are designed. By adjusting the bias voltage, the transceiver and receiver of the amplifier are switched. At the same time, a temperature compensation bias circuit is added to reduce the high and low temperature gain variation of the amplifier. It is suitable for multi-function transceiver chip or T/R module. The simulation results show that the gain of 1.8V broadband monolithic integrated bidirectional amplifier can reach 9dB in 5-15GHz operating band, the reflection coefficient of input and output ports is less than - 13dB and - 17dB respectively, the output power of 1dB compression point is + 5.5dBm, the working current is 12.2mA, the gain of 3.3V bidirectional amplifier can reach + 10.5dB, and the reflection coefficient of input and output ports is less than -12dB and -13dB. The output power of 1dB compression point is + 10dBm, and the working current is 20.3mA. The core area of the chip is 0.45 × 0.45mm2.
FPGA Implementation of Rake Receiver in Broadband Micro-power Wireless Communication System
Authors: Liu Shaohua
Published: November 2019

Aiming at the problem that receiver performance is seriously degraded by multipath fading in multipath channel, a three-finger Rake receiver design scheme is proposed, based on Chirp spread spectrum technology for multipath search, delay estimation and phase estimation. Firstly, the windowed algorithm is adopted in multipath search to improve the accuracy of multipath search. Secondly, detecting the spacing between multipath peaks can realize the delay estimation of multipath signals. Finally, the multipath signals are merged to enhance the receiving effect, significantly improving the system’s block error rate performance under the multipath channel environment. Matlab simulation shows that adding a Rake receiver in the system can improve performance by about 1.2dB. A multi-switching mechanism is applied in FPGA implementation, in order to reduce the hardware power consumption. FPGA simulation results verify rationality and correctness of the design, indicating that the system meets the requirements of block error rate less than 1% in actual transmission, when the signal-to-noise ratio is -2dB.
A cable partial discharge on-line monitoring method based on GPS clock wireless synchronization
Authors: song Yang , yunbo Wang , jianyou Yu
Published: November 2019

In recent years, power cables from 10kV to higher voltage level are widely used in cities for power transmission. As the main power transmission cable of power transmission and distribution, the most important parameter of its running state is the insulation condition of the cable, which can usually be reflected by the magnitude of grounding current, serious partial discharge or loss angle. This paper proposes a cable partial discharge on-line monitoring method based on GPS clock wireless synchronization (CPD-GPS), through introduceing GPS clock wireless synchronization, CPD-GPS can collect data timely and accurately. Experiments show, our method can effective realized the cable fault monitoring and has very important application value for the safe and stable operation of power grid.
Evaluation of the node importance of power communication network based on multi-factor evaluation indicators
Authors: Zhang Ran , Yuan Pengpeng , Feng Weidong , Zhang Geng , Wang Yanan
Published: November 2019

The continuous development of smart grid has promoted the advancement of the power communication network. And what followed was the complexity of the topology of the power communication network being increasing. In order to evaluate the importance of the network node more accurately, an evaluation method based on the multi-factor evaluation indicators is proposed in this paper. This method integrates the service layer and the topology layer of the network, and then combines the node types, the load factors of the nodes and the probability of failure of the nodes and links as a comprehensive factor coefficient to evaluate the importance of the nodes. The simulation results show that the algorithm proposed in the paper can consider the indicators affecting the importance of the node of the power communication network more comprehensively. It can evaluate the importance of the node more effectively which has a good application value.
EMD-CNN model based condition monitoring and fault warning for power overhead optical cable communication
Authors: Ma Le , Zhou Jinyan , Wang Yutong
Published: November 2019

Optical fiber communication has become the main communication mode of power communication in China. As the carrier and foundation, the stability and security of power communication optical cable is directly related to the reliability and security of power communication network in China. In this paper, the idea of in-depth learning is introduced into the condition monitoring of communication optical cable, taking the all-dielectric self-supporting optical cable (ADSS) as an example. By transforming the image into picture set and choosing the appropriate depth neural network model to analyse the picture, the condition monitoring of communication optical cable can be realized.
Design and Implementation of LED Constant Current Drive Circuit Based on Microcontrollers
Authors: Zhou Dengrong
Published: November 2019

In the paper, the LED light operating feature is analyzed, and the design, simulation and test on peak current control of Buck circuit are carried out to improve the reliability for LED drive circuit. Meanwhile, the PWM waveform of DC-DC switch tube and current waveform of LED Light are simulated and analyzed. Through these ways, it is found that the LED light current waveform is constant with small ripple under this modulation.
The development of classification model of peaberry and civet ground roasted coffee using UV-visible spectroscopy and two different compensation methods
Authors: Suhandy D , Yulia M
Published: November 2019

In this research, an investigation on the influence of particle size variation in the authentication of peaberry and civet ground roasted coffee using UV-visible spectroscopy and two different compensation methods was conducted. A total of 398 samples of peaberry and civet coffee with two particle sizes of 1680 μm dan 297 μm (mesh 12 and mesh 50) were prepared. The all coffee samples were extracted using hot distilled water. The extracted aqueous coffee samples were pipetted into 10 mm of cuvette and the spectral data was acquired using a UV-Vis spectrometer in the range of 190-1100 nm. The result of PCA showed that the samples can be clustered based on types of coffee (peaberry and civet) and based on particle size (mesh 12 and mesh 50) using pre-processed spectral data in the range of 250-450 nm. Using the global calibration model of PLS1 and PLS2, the prediction results for prediction sample set at particle size of 1680 μm dan 297 μm (mesh 12 and mesh 50) were excellent with low RMSEP, low SEP and low bias. This result demonstrated the ability of global calibration model (both based on PLS1 and PLS2) to compensate the influence of particle size variation on the authentication of peaberry and civet ground roasted coffee.
The use of probiotic Lactobacillus plantarum and Lactobacillus bifermentans as antidote of mercury metal (Hg) to the mice Rattus norvegicus
Authors: Dwyana Z , Fahruddin  , Haedar N , Ambeng  , Priosambodo D , Alam M R
Published: November 2019

Methyl mercury is a sort of most toxic mercury which was long since used by society in various fields. Methyl mercury is produced by a methilation process of anorganic mercury compound by metanogenic bacteria in aquatic sediment. The existence of excessive methyl mercury in the environment will be dangerous if entering the body of living beings. The aim of this research was to know the potential of probiotic bacteria spesies Lactobacillus plantarum and Lactobacillus bifermentans (in vivo) as antidote of mercury (Hg) poisoning to the experimental mice (Rattus norvegicus L.) after contacting methyl mercury acetate. This research used 5 various treatments where each of them conducted in 3 times repetition. The treatment which was used as follows; aquadest (positive control), mercury acetate 2 ppm (negative control), and probiotic bacteria Lactobacillus bifermentans; Lactobacillus plantarum; and also mixture culture of them. The observed parameter is the concentration of methyl mercury in blood and also through morphology observation qualitatively. The result of research shows that the giving of probiotic bacteria gives the real effect in decreasing the concentration of methyl mercury in blood. The best potential of probiotic bacteria as an antidote is Lactobacillus bifermentans because it can reduce the concentration of giving methyl mercury around 90,7 %.
Potential analysis Persea americana, Allium sativum and Ficus sepatica as anti-cancer uses in silico docking and ADMET prediction
Authors: Sulfahri  , Iskandar I W , Novriyani I , Damayanti P , Arif Afriani N , Sukmawaty S , Iqraini N , Nurhikmah  , Fidhatami I I , Razak R
Published: November 2019

Cancer has been a major cause of death in several countries, according to a recent report from the International Agency for Research on Cancer (IARC) which more than 300,000 cases diagnosed and killed reaching 145,000 people. Indoensia has provided lots of resources that has capability as anti-cancer. This study aimed to discover bioactivity of potential compound from several Indonesian’s plants i.e Persea americana, Allium sativum and Ficus sepatica to prevent cancer based on reverse docking studies by using PyMOL v1.7.4.5 Software (Schrödinger), the PyRx 0.8 software and SwissAdme Prediction. The seed of Avocado Persea americana has terpenoid that has a potential in cancer inhibitor with Aldo-Keto Reductase family 1 member B10. The main compound of garlic A. sativum is S-allylcysteine and Lysine-specific demethylase as target protein. Ficus sepatica has Antofin as potential compound and Steroid 17-alpha-hydroxylase as the protein. The binding affinity value are -7.8, -5.1 and 8,9 respectively.
Species composition and structure of mangrove in Tamo Rocky Cliff Beach Majene (West Sulawesi, Indonesia)
Authors: Priosambodo D , Juhriah  , Alam M , Al-Anshari M , Putra A W
Published: November 2019

West Sulawesi is locally well known for its rocky cliff beach along the coastline between Majene and Mamuju regency. Dato beach in Majene, for instance, is popular for tourism destination. In the area between Tamo, a small fisherman village and Dato can be found one rocky cliff beach with beautiful scenery. Cliff height varied between 5 m - 60 m. At the base of the rocky cliff stretched a fairly extensive mangrove which is separated from the cliff by the lagoon. This mangrove vegetation is thick, however, the species composition and structure remain unknown. Therefore, research is required to become important information in managing biological resources around the mangrove forest area. The research aims to know the species composition and structure of the mangrove communities in the Tamo rocky cliff beach. The sampling method used purposive sampling with four transects. All transects are combined with nested quadrat. A series of quadrat size, which is 1 x 1 m, 5 x 5 m and 10 x 10 m were used for counting the densities of mangrove seedling, stake, and trees respectively. All transect was set up crossing the mangrove area and perpendicular to the coastline. The result showed that mangrove composition consists of five true mangrove species, such as Avicennia marina, Bruguiera gymnorrhiza, Rhizophora mucronata, Rhizophora stylosa, Sonneratia alba with various associated mangrove species. Diversity and Evenness index was extremely low. In contrast, Simpson and Similarity index was high. Composition and structure of mangrove vegetation in Tamo rocky cliff beach dominated by monoculture stake of Rhizophora stylosa which is an importance value (IV) range between 182.90% - 300%.
Selection of Plastic Degradation Indigenous bacteria Isolated from Tamangapa Landfill Macassar City
Authors: Haedar Nur , Clara Theresia , Fahrudin  , Abdullah As’adi , Fausiah St. , Rapak Meidistria Tandi
Published: November 2019

Plastic is the most widely used polymers in all aspects of human life, including food packaging and pharmaco-cosmetics. The complex structures with long and repetitive chains make plastic difficult to be degraded naturally. Consequently, it will accumulate in landfills and the soil. One solution that can be done to overcome this problem is by biodegradation using microorganisms. This study aims to select bacterial isolates that are able to degrade plastics which are isolated from soil samples at Tamangapa landfill in Makassar City. Sampling of soil containing plastic waste used purposive sampling method at 5 different points at Tamangapa Landfill. Isolation of bacteria was conducted using Nutrient Agar (NA) which added 2% Polyethylene Glycol (PEG) and selection of degradation ability was carried out with liquid Mineral Salt media containing HDPE (High Density Polyethylene) and LDPE (Low Density Polyethylene) media. The degradation ability was observed based on the optical density value (OD) at a wavelength of 600 nm and loss of plastic dry weight for 14 days of incubation. The results of isolation and selection obtained 6 bacterial isolates that were able to degrade HDPE (High Density Polyethylene) and LDPE (Low Density Polyethylene) plastics. T7 isolates showed the highest degradation ability of 6% for 8% HDPE (High Density Polyethylene) plastic and LDPE (Low Density Polyethylene) compared to the other five bacteria isolates.
Viability and role of Beauveria Bassiana as endofit in Corn Bima 11 Tammu Tammu varieties against Aphids sp.
Authors: Daud I D , Agus N , Abdullah T , Dewi V S , Bunga I , Komaria S N , Tuwo M
Published: November 2019

Corn production can be increased by the use of superior varieties both free-range (non-hybrid) and hybrid corn. Hybrid corn can produce higher yields compared to free-roasted corn. Bima-11 Tammu Tammu variety is corn seed from the breeding of B11-126 (female), Mr-15 (male) varieties. One of the pests commonly found in corn plantations is aphids Aphids spp. One of the control alternatives that can be used is applying the entomopathogenic of Beauveria bassiana. The effectiveness of B. bassiana as a control for a number of insect pests has been proven. Damage due to Aphids sp. can be more severe, because these pests can transmit viral diseases to corn plants. This research begins with the preparation of Bima 11 Tammu Tammu varieties, seed viability test, preparation B. bassiana, re-isolation of plant tissue to detect the presence of B. bassiana, and Preparation of Aphids sp. The results showed that endophytic seeds had high viability and B. bassiana as endophytes in corn plants, application of B. bassiana to corn plants proves that it appears that the presence of B. bassiana in corn plants is three weeks after application, and Aphids sp. mortality in endophytic corn plants and in corn plants sprayed with B. bassiana is no different.
Predators effects on mortality of sandfish Holothuria scabra cultured in multitrophic system
Authors: Tresnati J , Yasir I , Syafiuddin  , Aprianto R , Mutmainnah  , Yanti A , Bestari A D , Tuwo A
Published: November 2019

Sandfish Holothuria scabra is a species of high economic value that causes sandfish to be the most captured sea cucumber species, and is an important source of income for fishermen in coastal villages. Sandfish capture causes already over fishing. If the wild population of sandfish is not managed properly, over fishing could cause sandfish extinction. This reason, an alternative efforts are needed to increase sandfish production, such as cultivation and restocking. Sandfish was a species that can live in the estuary region, so that it has the potential to be maintained in brackish water ponds. One of the problems of Sandfish cultivation in the brackish water ponds was the predators attack. This study aims to analyze the predator attack on sandfish. The study was carried out on a microcosm scale by using the tanks. The organism used was Sandfish H. scabra, Nile Tilapia Oreochromis niloticus, and seaweed Gracilaria sp. Mangrove Snail attack can cause death if the sandfish has already eviscerated. The healing process takes one to several weeks, depending on the size of the wound. Nile Tilapia attacks were generally not deadly. Death only occurs if the wound is too deep and causes internal organs to come out, but this was very rare. During the study, only one case occurred in which the sandfish died due to the attack of Nile Tilapia. The sandfish that not injured in the ventral side, and does not suffer from evisceration, the mortality was zero. Sandfish wounds heal within one to three weeks, depending on the surface area of the tegument eaten by Nile Tilapia. Healed wounds appear darker in color.
Non-edible Oil of Cerbera manghas L. Seed From Seram Island - Maluku as Oil Source of Biodiesel Production
Authors: Sutapa I Wayan , Rosmawaty  , Ropa Heni
Published: November 2019

Conversion of the Cerbera manghas L seed oil into biodiesel using homogenous catalys through esterification and transesterification stage have been done. Esterification process was carried out using mole ratio of methanol/oil 1:3, temperature 60-65°C for 2 hours with acid catalyst 1.25% H2SO4. The products were separated between methanol and triglycerides continued by transesterification process using mole ratio of methanol/oil 1:6. Initialy, the methanol have been reacted to NaOH catalyst using the catalyst variation 0.1; 0.2; 0.3; and 0.4%, for 2 hours and the reaction temperature 60-65°C. Biodiesel results were analysed by FTIR, GC-MS, and ASTM. The result show that the optimum biodiesel obtained on weiggt of catalyst is 0.3% NaOH. ASTM the test of results were obtained the propesties of the biodiesel there were: specific density of 0.8808 g/cm3, kinematic viscosity of 6.511 mm2/s, flash point 168°C, pour point 9°C, cloud point 12°C and conradson carbon residual 0.165 wt%.
Synthesis of Poly(Ethyl Eugenyl oxyacetate) as Carrier For Separation of Heavy Metal Ions Fe(III), Cr(III), Cu(II), Ni(II), Co(II), and Pb(II) Using Liquid-Liquid Extraction Method
Authors: Harimu L , Matsjeh S , Siswanta D , Sentosa S J , Sutapa I W
Published: November 2019

Synthesis of poly(ethyl eugenyl oxyacetate), PEEOA, has been conducted. The compound was applied to separate Fe(III), Cr(III), Cu(II), Co(II), and Pb(II) using a liquid-liquid extraction method. The effect of pH, polyeugenyl ethyl oxyacetic ion carrier concentration, extraction time, and metal concentration was optimized to obtain optimum condition. The result showed that the synthesized polyeugenyl ethyl oxyacetic has a yellow color with a melting point 127-1300 °C and yield efficiency of 87%. The formation of polyeugenyl ethyl oxyacetid confirmed with IR spectroscopy and 1H-NMR spectra. The appearance of the absorption band at 1759 cm−1 as stretching vibration of carbonyl (C=O) esther and 1280 and 1373 cm−1 as stretching vibration of carbonyl (C-O-C), chemical shift at 4,74 ppm for proton methylene (CH2-C=0) and chemical shift at 1,27 ppm for proton methyl (O-CH2-CH3). The optimum condition for ion separation has occurred at pH 3-6 for ion Fe(III), pH 5 for ion Cr(III), Ni(II), Co(II), Cu(II), and Pb(II). The carrier volume was optimum at 5 mL (1 × 10−3 M) for Fe (III), 10 mL for Cr(III), Ni(II), and Co(II), and 15 mL for Cu(II), and Pb(II). The optimum extraction time was 2,5 and 20 hours for ion Fe(III) and Cr(III), respectively, and 36 hours for ion Cu(II), Ni(II), Co(II) and Pb(II). The concentration range of metals ion accurately extracted was 0.75 - 5 x 10−4 M for ion Fe(III); 0.75- 2.50 x 10−4 M for Cr(III), Ni(II), and Co(II) and 0.75-1 x 10−4 M for Cu(II) and Pb(II). Compared to other metal ions the respond polyeugenyl oxyacetic acid was best Fe(III) with selectivity order Fe(III) > Cr(III) > Cu(II) > Pb(II) > Ni(II) > Co(II).
Green-route synthesis and characterization of the silver nanoparticles resulted by bio-reduction process
Authors: Roddu A K , Wahab A W , Ahmad A , Taba P
Published: November 2019

The synthesis of silver nanoparticles by using the leaves extract of Abelmoschus esculentus as a bio-reductor agent have been conducted. Leaf extract produced by using the boiling process of the leaves in boiling water. Ag+ ions as a source of silver metal formed by dissolving AgNO3 into distilled water. A solution containing Ag+ ions was added to the leaf extract of Abelmoschus esculentus, followed by an incubation process accompanied by stirring at medium speed. Silver nanoparticles formed were characterised by UV-VIS, FT-IR, PSA and SEM. Based on the results known that the highest nanoparticles formed during the incubation period of 6 days with the size of silver nanoparticles mostly less than 100 nm. SEM results show that silver nanoparticles have a non-uniform cubic shape morphology. Band gap energy for each incubation period 1; 2; 3; 6 and 7 days are 2.263 eV; 2.228 eV; 2.227 eV; 2.096 eV; and 2.227 eV respectively.
Toxicological evaluation and antibacterial activity of crude protein extract from endophytic bacteria associated with Algae Eucheuma spinosum
Authors: Sugrani A , Ahmad A , Djide M N , Natsir H
Published: November 2019

This study evaluated the toxicological and antibacterial activity of crude extract of endophytic bacteria’s protein associated with the red algae Eucheuma spinosum which was produced at various incubation times. The external and internal proteins of the potential bacteria were collected on the incubation times which were 18, 24, 30, 36, 42, 48, and 54 hours. The evaluation toxicological of protein used Brine Shrimp Lethality Test (BSLT) method and the antibacterial activity of protein towards E. coli and S. aureus were measured using the diffusion method. Seven bacteria were successful to be isolated from these algae (ES01, ES11, ES21, ES22, ES23, ES24, and ES25), the Isolate ES25 was a genus of Vibrio and its protein had the potential to be produced. External protein levels were higher than internal, so it continued with the next phase. The extracted protein of (PE42) was active towards S. aureus (12.0 mm) while the extracted protein of (PE36) is active toward E. coli (9.0 mm) and also highly toxic to the larvae of Artemia salina Leach (1.596 μg/mL). The external protein of endophytic bacteria ES25 (Vibrio) associated with red alga Eucheuma spinosum was potentially produced in the time of incubation above 36 hours to get the highest toxicity and active antibacterial.
Cloning and characterization of Rv1980c gene encoding MPT64 Protein from Mycobacterium tuberculosis as a new candidate vaccine of tuberculosis
Authors: Ahmad A , Agus R , Massi M N , Handayani I , Karim H
Published: November 2019

Pathogenic mycobacteria are one of the major causes of human mortality in the word. Mycobacterium tuberculosis is an etiological agent of human tuberculosis. Designing new vaccines including recombinant protein vaccines may be considered as a new approach for preventing or reducing tuberculosis epidemics. In order to construct protein recombinant as candidate vaccine, the Rv1980c gene encoding MPT64 protein was amplified from M. tuberculosis H37Rv strain genomic DNA using the PCR method and inserted into the cloning vector pGEM-T Easy. The recombinant plasmid pGEM-T Easy-MPT64 was then transformed into E. coli JM109 and cultivated under standard procedure, followed by plasmid extraction, PCR amplification, and DNA sequencing. The correct Rv1980c gene was confirmed by DNA sequencing and subcloned into expression vector pQE30Xa to yield recombinant plasmid pQE30Xa-MPT64, and transformed into E. coli BL21 strain. Transformed white recombinant colony was selected, cultured, induced with 40 μM IPTG, and identified using SDS-PAGE electrophoresis method. The molecular weight was found to be about 24 kDa and identified as recombinant protein MPT64. The target gene has been cloned into host E. coli BL-21 strain and expressed successfully as a soluble protein. The recombinant fusion recombinant protein MPT64 paves the way for tuberculosis diagnosis and vaccine development in the future, especially in Indonesia.
The potency of protein Hydrolysate from Epiphytic bacteria associated with brown algae Sargassum sp. as anticancer agents
Authors: Asmi N , Ahmad A , Massi M N , Natsir H
Published: November 2019

The object of this study is the protein hydrolysates produced from the epiphytic bacteria associated with brown algae Sargassum sp. Hydrolysate protein for crude extract, F1, F2, F3 and F4 are obtained through hydrolysis using the trypsin enzyme. The conditions of reaction at pH 8.0, 37 ˚C, at an enzyme-substrate ratio of 1: 6 with various hydrolysis time (0, 1, 3, 5, 9 and 11 hours). The degree of hydrolysis was determined by using the TCA method and toxicity assay carried out by Brine Shrimp Lethality Test (BSLT) method using the shrimp larvae of Artemia salina Leach. The results of the study show the highest degree of hydrolysis protein was found on time of 9 hours and the highest activity was shown by the F4 with an LC50 value 27.91µg/mL. These findings suggest that hydrolysate proteins from epiphytic bacteria can be a potential source as anticancer against.
Phytochemical analysis and antioxidant activity of soursop leaf extract (Annona muricata Linn.)
Authors: Hasmila I , Natsir H , Soekamto N H
Published: November 2019

Soursop (Annona muricata Linn) is one of herbal plants that are widely used as antidiabetic, anti-inflammatory, insecticidal, antimalarial, anticancer, antibacterial and antioxidant. Soursop leaf has many benefits because it contains phytochemical compounds. This research aimed to identify the phytochemical compounds and antioxidant activity of soursop leaf. This research were carried out in a few steps which are extraction, evaporation, phytochemical tests and measurement of antioxidant activity. The result showed that the ethanol extract of soursop leaf was contained steroid, alkaloid, flavonoid, phenolic and saponin. The ethanol extract of soursop leaf has antioxidant activity by scavenging DPPH radical with IC50 of 141,127 μg / mL.
Photodegradation of remazol brilliant blue using Fe2O3 intercalated bentonite
Authors: Suprihatin I E , Sibarani J , Sulihingtyas W D , Ariati K
Published: November 2019

This paper reports the use of Fe2O3 intercalated bentonite as a photocatalyst to degrade remazol brilliant blue. The photodegradation was conducted by irradiating aqueous solution of the coloring agent and Fe2O3 intercalated bentonite with UV ray at 259 nm. The degradation percentages were observed at various pH, photocatalyst mass, and irradiation duration to obtain the optimum condition of the photodegradation. The observation showed that the optimal photodegradation occurred at pH 4, using 100 mg bentonite-Fe2O3, irradiated for 2 hours. The proses can degrade effectively 200 ppm remazol brilliant blue with a percentage of 98.20 ± 0.07%.
Characterization of Polyurethanes from MDI, PEG 400 and Kepok Banana Hump additives with TGA, DTG and LCMS spectrometers
Authors: Budirohmi A , Ahmad A , Firdaus  , Taba P , Tahir D
Published: November 2019

Polyurethanes from methylene diphenyl isocyanate (MDI), polyethylene glycol (PEG) 400 and banana weevil starch have been synthesized. This polymer has been characterized using thermogravimetric analysis (TGA), differential thermogravimetry (DTG), liquid chromatography-mass spectrometry (LCMS), and polyurethane physical tests which include: tensile and strain tests. Thermal properties can be measured using TGA and DTG devices, which aim to determine the weight of the sample under controlled conditions and cooling at a controlled rate as a function of time. TGA and DTG analysis results showed that KBH starch with a concentration of 15% in phase 1 polymerization reaction occurred at a temperature of 78 ° C, then in phase 2 a mass change of 2.87% occurred and in phase 3 saturation occurred marked by a mass loss of 97.03%. Polyurethane physical test results showed a strain of 34.37% GL and an extension of 8.6733 nm. These results indicate that polyurethane has the potential to be applied as an ingredient in the manufacture of medical devices, that operate under heating conditions
Adsorption of metal ion, Co(II) on Eucheuma spinosum
Authors: Taba P , Auliya W , Kasim S , Nafie N L , Hala Y
Published: November 2019

Eucheuma spinosum is one of the seaweed species that found abundantly in Takalar Regency. We used the biomass of the seaweed as an adsorbent for the removal of metal Co(II) ions from an aqueous solution. The adsorption of Co(II) ion by E.spinosum biomass was carried out in various contact time, pH, and concentration. The concentration of metal ion Co(II) before and after adsorption was determined using the Atomic Absorption Spectrophotometer (AAS). The adsorption capacity of Co(II) ions by E. spinosum seaweed was determined using the Langmuir and Freundlich isotherms. The results showed that the optimum time was 20 min, and the optimum pH was 3. Adsorption of metal ion Co(II) using E. spinosum seaweed was in parallel to the Freundlich isothermal model with the adsorption capacity (Qo) of 3.46 mg g−1. The functional group involved in adsorption of Co(II) metal ions was C-OH groups.
Antibacterial and cytotoxic activities assay from the extract of macroalga Halimeda cylindracea from Gulf of Boni, Indonesia
Authors: Dini I , Soekamto N H , Firdaus  , Supratman U
Published: November 2019

This study aimed to find out the antibacterial and cytotoxic activity of n-hexane, ethyl acetate, acetone, and ethanol extracts from macroalgae Halimeda cylindracea that was collected from Gulf of Boni. The antibacterial activity was evaluated against Stapilococcus aureus, Escherichia coli, and Salmonella typhi with the Kirby Bauer method. The cytotoxic activity was evaluated with a Brine Shrimp Lethality test. Extraction was performed successively with n-hexane, ethyl acetate, acetone, and ethanol for 3 x 24 hours with maceration method and evaporated with a rotary evaporator to obtain dry extract. Antibacterial activity was evaluated by inhibition zone where the cytotoxic was observed by LC50 value of each tested extract. The result indicated that ethyl acetate extract showed active to all bacteria test which acetone extract was active against S. aureus and E. coli, n-hexane extract was active against S. aureus, and ethanol extract was not active to all bacteria test. N-hexane, ethyl acetate, acetone, and ethanol extracts of macroalgae H. cylindracea were toxic toward Arthemia salina Leach with moderate toxicity category with LC50 value 134.90, 281.84, 338.84 and 295.12 µg/mL respectively.
Characterization molecularly imprinted polymers as a selective adsorbent in the solid-phase extraction method
Authors: Fauziah St. , Hartina A , Soekamto N H , Budi P , Taba P
Published: November 2019

The Molecularly Imprinted Polymers (MIP) synthesis with the precipitation method uses more porogen solvent volume has been carried out. The purpose of this study was to obtain MIP which would be applied as a selective adsorbent against β-Sitosterol. The structural characteristics of MIP were carried out using FTIR, SEM, EDS, BET, and TGA. FTIR spectrum shows that functional groups that play a role in the formation of MIP are functional groups of OH, C=C, and C=O. The surface morphology of the MIP was analyzed by SEM and the analysis of very important elements in the formation of MIP was analyzed by EDS. Surface area, pore-volume, and pore diameter were analyzed by BET, and TG analyzed MIP resistance to heat. MIP is a white polymer granule and has better adsorption ability than NIP. The morphology of the rough and porous surface of MIP based on SEM data and EDS data shows that there is a loss of % carbon atoms and % mass respectively 1.88 % and 2.28 % after extraction of β-sitosterol as a printing molecule. BET data show that the pore diameter of MIP is 3.4 nm which includes mesoporous material. Based on the adsorption ability and structural characterization of MIP_MAA-co-TRIM β-sitosterol it is very good to be applied as an adsorbent in the SPE method and chromatography.
In vitro antibacterial and anticancer activity of Zn(II)Valinedithiocarbamate complexes
Authors: Kartina D , Wahab A W , Ahmad A , Irfandi R , Raya I
Published: November 2019

A new complex of Zn(II) that contain amino acid valine and dithiocarbamate ligands were synthesized and characterized by using Ultraviolet Visible (UV-Vis), Infra Red (IR) spectroscopy, X-Ray Fluoroscence (XRF), X-Ray Diffraction (XRD), melting point and molar conductance. The complex was prepared by “in situ method” and showed that complexes are successfully synthesis. The invitro cytotoxic complexes compound was examined againts MCF-7 (breast cancer) using cis-Pt drug as a control positive and the complexes exhibit very strong invitro cytotoxic againts MCF-7 based on IC50data is 639,35 µg/mL which indicates that the complex can induce the morphological MCF-7 cancer cells changes towards apoptosis. Complexes compound were evaluated as their antibacterial agents activity against ofmycobacterium tuberculosaH37RV using LJ method and results show these complexes are potential as anti-tuberculosis agents. Therefore this complexes compounds can be use to new drugs compound in the treatment againts of MCF-7 and tuberculosis.
Potential of stigmasterol from EtOAc extract Melochia umbellata (Houtt) Stapf var. Visenia as Dengue Antivirus
Authors: Soekamto N H , Firdaus  , Ahmad F , Appa F E
Published: November 2019

Stigmasterol has been isolated from the stem bark extract of Melochia umbellata (Houtt) Stapf var. Visenia. The methods used include multilevel maceration, fractionation, and crystallization. Elusidation structure of compound based on spectroscopy data IR, 1H and 13C NMR. Stigmasterol obtained has the potential as a dengue antiviral agent with IC50 9.11 μg / mL.
Relationship between distribution of dimethyl sulfide (DMS) and plankton community structure in Spermonde, Indonesia
Authors: Armus R , Noor A , Ahmad A , Lukman M
Published: November 2019

Dimethylsulfide (DMS), particulate dimethylsulfoniopropionate (DMSP) and phytoplankton abundance are measured on the surface of the sea and sub-surface in the spermonde area, the Makassar Strait in January 2018. At the mouth of the Tallo River, domestic runoff affects the dominance (D) of phytoplankton from the Makassar city river flow, and the reduction of nutrients from the sea cannot be predicted. Pangkep river estuary abundance of phytoplankton is more dominant than the genus Chaetoceros sp. The location is relatively strong research at the highest flow velocity at the estuary Pangkep is 10.45 cm/sec, and the lowest is located at the estuary Tallo is 5.87 cm/sec. The most abundant phytoplankton abundance in the west are found in sea level comes from Coscinodiscus sp class with the same abundance percentage composition of 71% and zooplankton groups are most often found originated from Temora sp class with composition percentage of 6.2%. The highest abundance of phytoplankton in the substrate Leptocylindricus sp is 73%, while the highest zooplankton abundance was 4.9%. The average value of the diversity index is 1.11; 0.082 and 0.521 while the value of diversity index, uniformity and dominance at sea subsurface 1.14; 0.088 and 0.55.
A Priority Packet Dissemination Scheduling Mechanism in Vehicular Ad-Hoc Networks
Authors: Jeffry  , Usman S , Aziz F
Published: November 2019

One of the vehicle communication technologies in the Intelligent Transport System is the Vehicular Ad-Hoc Networks (VANETs). VANET is a communication technology between one vehicle with other vehicles so as to reduce the impact of traffic accidents. Quality of Service requirements in VANETs communications has been supported by the standard protocol, IEEE 802.11p WAVE (Wireless Access in Vehicular Environment) protocol. The mechanism used in this protocol is CSMA/CA that divides four access categories in the selection of channel access by ensuring the success of more priority packets compared to the low priority ones. However, if another vehicle has the same priority packet to send, then a collision might happen. This paper proposes a packet deployment mechanism based on priority. Priority packets are estimated based on location and traffic conditions of vehicles, and then the AODV protocol is used for data deployment. Experimental results showed that priority based channel access perform better than CSMA/CA with an increasing PDR average about 24%, throughput of about 0.25 Mbit/sec and delay of about 0.0969 seconds.