Garuda - Garba Rujukan Digital

Article Per Year (5 Year)

All

Widyariset

widyariset
Website

Published by Lembaga Ilmu Pengetahuan Indonesia

ISSN : 14117932 EISSN : 24610976 DOI : -

Core Subject : Engineering,

Engineering

Widyariset is a scientific journal which publishes the results of research and development, assessment and systematic thinking about science and technology. The writers of the scientific papers in this journal come from researchers/researcher candidates from various institutions' research and development (R&D), and universities. Widyariset is published regularly three times a year: in April for the issue of Social Sciences and Humanities (IPSK), in August for the issue of Natural Sciences (IPA) and in December for the issue of Engineering Sciences (IPT).

Arjuna Subject : -

Articles 485 Documents

41 42 43 44 45

A STUDY OF STRESS CORROSION CRACKING RESISTANCE FOR COLD FORMING PLASTIC DEFORMED Cu-30Zn ALLOY Gadang Priyotomo; Akhmad Faizal; Rini Riastuti
Widyariset Vol 4, No 1 (2018): Widyariset
Publisher : Pusbindiklat - LIPI

Cu-30Zn alloy has good atmospheric corrosion resistance. It is mainly used as automotive radiator cores, ammunition component, lamp fixture, flashlight shells and kickplates. Cold rolled Cu-30Zn with deformation degree 33,87% at 300OC was tested its Stress Corrosion Cracking (SCC) property. Stress corrosion cracking (SCC) of a Cu–30Zn has been investigated using Mattsson solutions 0,5 M (NH4)2SO4 + 0,05 M CuSO4 in room temperature by using a constant load method. Cu-30Zn has a weakness on stress corrosion cracking in ammonia environment (mattson solution). Scanning electron microscope (SEM) testing indicated the failure of cold roll Cu-30Zn was a transgranular cracking. Furthermore, cracking occued at stress below yield stress. Energy dispersive Spectroscopy (EDS) test exhibited dezincification indication on fracture surface. The visual examination of surface morphology on alloy showed discoloration from yellow to red. Homogenized Cu-30Zn showed better SCC resistance than cold rolled Cu-30Zn.

TRANSPLANTATION OF GIANT GOURAMY (Osphronemus gouramy) TESTICULAR CELLS IN EARLY HATCHING TILAPIA (Oreochromis niloticus) LARVAE Jasmadi Jasmadi; Odang Carman; Alimuddin Alimuddin
Widyariset Vol 2, No 2 (2016): Widyariset
Publisher : Pusbindiklat - LIPI

Cell transplantation technology has been widely developed in mammals, but less implemented in inland aquaculture fish. Giant gouramy (Osphronemus gouramy) is one of important comercial aquaculture commodities that has a relatively long first reproductive cycle compared to the tilapia (Oreochromis niloticus). Tilapia has a faster reproductive cycle and potential as giant gouramy surrogate broodstock. This study was aimed to applicate testicular cell transplantation technology of giant gouramy in tilapia larvae and to evaluate its success rate trough donor cell colonization. Tilapia larvae of 1-2 dph (days post hatching) and 3-4 dph were injected with ±20.000 giant gouramy testicular cells in the peritoneal cavity, and then groomed for two months. Cell colonization of spermatogonium donor was determined by Polymerase Chain Reaction (PCR), using giant gouramy F1-Growth Hormone and R1-Growth Hormone primers. The result of cell dissociation showed that a bigger giant gouramy (827 g) had lower of spermatogonia composition (4.45%) than a smaller gouramy (608 g) (14.96%). Donor cell colonization in 1-2 dph recipient was higher (100%) than in 3-4 dph recipient (75%). Whereas recipient Survival Rate (SR) was 89.34% for 1-2 dph recipient and 98.96% for 3-4 dph recipient respectively. This study suggests that testicular cell transplantation technology of giant gouramy could be appllied to tilapia (Xenotransplantation) and cell transplantation has a better performance in 1-2 dph than in 3-4 dph recipients. With such success, there is a high potential that the giant gouramy cultivation can be increased through the cell transplantation technology.

FORMULATION OF CHITOSAN MEMBRANE COMPOSITION AND STIRRING OPTIMIZATION FOR REDUCING TOTAL SOLID OF PALM OIL MILL EFFLUENT Sri Wahyuni; Siswanto Siswanto; Soekarno Miswana Putra
Widyariset Vol 3, No 1 (2017): Widyariset
Publisher : Pusbindiklat - LIPI

Palm oil mill effluent (POME) is palm oil industry wastewater with high solid content. Waste filtration using chitosan membrane has been investigated to decrease the solid waste, but the final value does not meet the quality standards. Therefore, further development on formulation and optimization of the membrane manufacturing process (composition and stirring speed) are needed. The purpose of this study was to determine the effect of composition and stiring speed on the performance of the membrane in decreasing solid content of POME. Chitosan membrane was prepared by phase inversion method with two supporting materials, namely Poly Ethylene Glycol (PEG) and Poly Vinyl Alcohol (PVA). The variables of this experiment were Chitosan:PVA ratio (40:60, 45:55, 50:50, 55:45 and 60:40 (v/v)) and stiring speed (200 rpm and 250 rpm). Chitosan composite membrane was tested in a cross flow reactor system. The result showed that the highest rejection values of TSS and TDS generated by the membrane on the chitosan and PVA ratio of 50:50 (v: v) at agitation speed of 250 rpm were 96.84% and 97.23%, respectively.

Abstrak Inggris admin admin
Widyariset Vol 3, No 2 (2017): Widyariset
Publisher : Pusbindiklat - LIPI

THE EFFECT OF EL-NINO 2015 ON THE RUBBER PLANT (HEVEA BRASILIENSIS) GROWTH IN THE EXPERIMENTAL FIELD SEMBAWA RESEARCH CENTRE Jamin Saputra; Charlos Togi Stevanus; Andi Nur Cahyo
Widyariset Vol 2, No 1 (2016): Widyariset
Publisher : Pusbindiklat - LIPI

Dry season is a fator affecting plant growth. If climate anomaly El-Nino that causing prolonged dry season happens, the effect on the plant growth will be bigger. On 2015, El-Nino is happening. The presence of climate anomaly like La-Nina and El-Nino can be predicted by SOI (South Oscilation Index) released by Australian Bureau of Meteorology. Continued positive SOI value indicates symptomps of La-Nina climate anomaly and continued negative SOI value indicates symptomps of El-Nino climate anomaly. This research was aimed to determine the effect of El-Nino climate anomaly that causing prolonged dry season on the growth of PB 260 clone in Sembawa Research Centre Experimental Field. This research was conducted by comparing the growth of PB 260 clone during wet season and prolonged dry season. The result shows that under condition of 2015 El-Nino phenomenon, the growth rate of PB260 clone was decreased until 75%. The attemps to minimalize the effect of El-Nino on the growth of rubber clone was by selecting appropriate clone and location where the clone was planted, water conservation, and K fertilization with double dosage.

THE EFFECT OF INDUCTOR RESISTANCE ON DEFIBRILLATION ENERGY FROM ELECTROCARDIOGRAPH ENDURANCE TEST SYSTEM Irawan Sukma; Siddiq Wahyu Hidayat; Wuwus Ardiatna
Widyariset Vol 3, No 1 (2017): Widyariset
Publisher : Pusbindiklat - LIPI

Electrocardiograph endurance test system has two work processes like defibrillator. Charging process produces energy stored in capacitor (ES) and discharges process produce defibrillation energy. Defibrillation energy without connect to electrocardiograph (E2) at test system is influenced by the resistance values of inductor (RL). In previous research, test system only produces E2 = 19,83 joule, this is caused by the inductor used with value RL = 72 Ω. The purpose of this research is to select inductor resistance value to get good and efficient value E2. Range value RLused in test system was 1–10 Ω, based on standar International Electrotechnical Commission (IEC) 60601-2-27 clause 201.8.5.5.2. Voltage measured in point 100 Ω every time interval (∆t) 0,02 ms obtained from multisim software simulation. The result of simulation indicated if peak voltage increased, then value RL was used approach zero. In other side, measured Voltage data was used as parameter to calculate total E2in every range of RLvalue, then result E2total was compared to ES value to get energy ratio value. Value RL= 1 Ω was the most efficient because has ratio energy value 98,45% with E2 = 393,80 joule, while energy ratio when RL= 10 Ω was not efficient because only had energy ratio value 89,58% with E2 = 358,33 joule.

ESTIMATION OF HERITABILITY AND BREEDING VALUE OF PIGLET BIRTH WEIGHT Bayu Dewantoro Putro Soewandi; V. M. Ani Nurgiartiningsih; Kuswati Kuswati
Widyariset Vol 3, No 2 (2017): Widyariset
Publisher : Pusbindiklat - LIPI

Piglet birth weight has an economic value and commonly correlated with weaning weigh. Therefore, birth weight traits of piglet needs to be selected for genetic improvement. The purpose of a study was to estimate the genetic improvement of piglet birth weight based on heritability and breeding value. Around 154 heads of offsprings generated from 6 sires and 14 sows were used in this study. The data of piglet birth weight was analyzed for heritability (nested classification), breeding value, selection response, and genetic improvement estimation. The result showed that the heritability (h2) of offsprings was 0.24±0,15. Based on breeding value, sires which had high piglet birth weight can be used for male ranking. Selection of response value was 0.06 kg. According to the selection of response value, improvement of birth weight in piglet based on the sire used can be estimated.

THE EFFECT OF MULBERRY TYPES ON THE PRODUCTIVITY OF COCOON OF TWO Bombyx mori L SILKWORM HYBRIDS Lincah Andadari; Minarningsih Minarningsih; Rosita Dewi
Widyariset Vol 3, No 2 (2017): Widyariset
Publisher : Pusbindiklat - LIPI

Mulberry (Morus sp.) is the only food for silkworm of Bombyx mori L and larvae that is fed with highly nutritious mulberry leaves will have more resistant to disease and able to produce the better cocoon. The study was aimed to determine the effect of mulberry SULI 01, ASI, and Morus cathayana as feedingmaterials for cocoon production from PS 01 and C 301 silkworm hybrids. The study was arranged in Block Randomized Design, with a factorial design of three type of mulberry’s leaf and two hybrids of silkworm. Feed setup and maintenance of a silkworm cocoon until harvest time was carried out at Cipeuteuy village, Kabandungan, Sukabumi district. The determined parameters were rendement of rearing, the weight of cocoon, the weight of cocoon shell, and cocoon shell percentage. The result showed that rendement of rearing to all treatment was not significantly affected, in which all treatment showed average percentage above 90%. The treatments combination of ASI mulberry and PS01 silkworm hybrid gave the best result for parameters of rendement rearingaround 96.6%, the weight of cocoon 1.78 g, and the weight of cocoon shell 0.37 g, while cocoon cell percentage is around 21.18%. The result of a combination between SULI 01 and PS 01 is rendement rearing around 95.20%, the weight of cocoon 1.6 g, the weight of cocoon shell 0.34 g, and cocoon shell around 21.47%.

ZIRCONIUM POLYMER CHARACTERISTIC AS 99Mo / 99mTc GENERATOR ABSORBENT FOR DIAGNOSTIC RADIOPHARMACEUTICALS Umi Nur Sholikhah; Hotman Lubis; Endang Sarmini; Herlina Herlina; Kadarisman Wisnukaton
Widyariset Vol 2, No 1 (2016): Widyariset
Publisher : Pusbindiklat - LIPI

One of the radiopharmaceuticals that were used for diagnostic is conducted by using Technetium-99m (99mTc), which could be obtained from Molybdenum-99 (99Mo) separation. This research was conducted to determine the adsorbent polymer variation effect at two zirconium chromatography systems to obtain 99mTc yield more than 80%. Polymers were used zirconium-TEOS as adsorbents in the first system while the second system used Zirconium-TEOS-methanol. The same method was conducted for both systems. The preparation was done by adding 99Mo on both polymers and heated at 90 °C temperature for three hours. Elution process of 99Mo and 99mTc was conducted by using column chromatographic system, in which the column filled with Alumina is connected to the Zirconium polymer column. The elution process was conducted on the next day until 10th fractions. Both of the systems showed the 99mTc radionuclides were highest eluted at the 3rd fraction then they decline to constant at the 10th fraction. The 99mTc yield in the system 1 was 58% and the system 2 was 96.23%. The elution from the system 1 was not analyzed by Atomic Absorption Spectrometer (AAS) because the 99mTc yield was less than 80%. Analysis results using AAS on the system 2 found out that the system 2 contained Si 1.11 ppm, and no other elements (Mo and Zr) was obtained. Based on Lethal Dose 50 (LD50), it is showed that the elution of system 2 is below the threshold (Mo = 4000 mg /kg, Zr = 489 mg /kg and Si = 22.5mg /kg), therefore it was safe to be used for diagnostic radiopharmaceuticals.

THE EFFECT OF CHARGING CONDITION FOR CONDUCTED EMISSION VALUE OF INFORMATION TECHNOLOGY EQUIPMENT Agung Yanuar Wirapraja; Ika Prawesty Wulandari
Widyariset Vol 4, No 1 (2018): Widyariset
Publisher : Pusbindiklat - LIPI

Currently, IT devices, especially mobile phone and notebook, have become a staple for humans. These devices can’t be separated from human activities. Mobile phone or notebook using those are too often can lead people to conduct any charging process when that device is being used. In general, there are three conditions for any devices when the charging process is being performed, such as: off, standby, and normal use (music on). This research objective is to compare the result on conducted emis- sion testing when mobile phone and notebook at the plugging charge for the conditions: off, stand by, and normal use (music on). Testing method refers to CISPR 22 Standards at Clause Mains Terminal Disturbance Voltage. Testing result for mobile phone and notebook show that all of testing sample perform conducted emission value with quasi peak value meet the requirement of CISPR 22. The amount of 80% testing sample, perform the highest quasipeak margin value when the off condition of devices.

Page 43 of 49 | Total Record : 485

41 42 43 44 45

Filter by Year

2009 2022

Filter By Issues

All Issue Vol 8, No 1 (2022): Widyariset Vol 6, No 2 (2020): Widyariset Vol 6, No 1 (2020): Widyariset Vol 5, No 2 (2019): Widyariset Vol 5, No 1 (2019): Widyariset Vol 4, No 2 (2018): Widyariset Vol 4, No 1 (2018): Widyariset Vol 3, No 2 (2017): Widyariset Vol 3, No 1 (2017): Widyariset Vol 2, No 2 (2016): Widyariset Vol 2, No 1 (2016): Widyariset Vol 18, No 2 (2015): Widyariset Vol 18, No 1 (2015): Widyariset Vol 1, No 1 (2015): Widyariset Vol 17, No 3 (2014): Widyariset Vol 17, No 2 (2014): Widyariset Vol 17, No 1 (2014): Widyariset Vol 16, No 3 (2013): Widyariset Vol 16, No 3 (2013): Widyariset Vol 16, No 2 (2013): Widyariset Vol 16, No 1 (2013): Widyariset Vol 16, No 1 (2013): Widyariset Vol 15, No 3 (2012): Widyariset Vol 15, No 3 (2012): Widyariset Vol 15, No 2 (2012): Widyariset Vol 15, No 1 (2012): Widyariset Vol 14, No 3 (2011): Widyariset Vol 14, No 2 (2011): Widyariset Vol 14, No 1 (2011): Widyariset Vol 13, No 3 (2010): Widyariset Vol 13, No 2 (2010): Widyariset Vol 13, No 2 (2010): Widyariset Vol 13, No 1 (2010): Widyariset Vol 12, No 3 (2009): Widyariset Vol 12, No 1 (2009): Widyariset More Issue

Home Page

OAI Link

Editorial Team

Contact

Reviewer

Google Scholar

Contact Name
-

Contact Email
-

Phone
-

Journal Mail Official
widyariset@mail.lipi.go.id

Editorial Address
Pusbindiklat Peneliti-LIPI (The National Training and Education Center for Researchers Development – Indonesian Institutes of Sciences) Jl. Raya Bogor Km. 46, Cibinong Science Center Cibinong - Bogor 16911

Location
Kota adm. jakarta selatan,

Dki jakarta

INDONESIA

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Home Page

OAI Link

Editorial Team

Contact

Reviewer

Google Scholar

Contact Name -

Contact Email -

Phone -

Journal Mail Official widyariset@mail.lipi.go.id

Editorial Address Pusbindiklat Peneliti-LIPI (The National Training and Education Center for Researchers Development – Indonesian Institutes of Sciences) Jl. Raya Bogor Km. 46, Cibinong Science Center Cibinong - Bogor 16911

Location Kota adm. jakarta selatan, Dki jakarta INDONESIA

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Contact Name
-

Contact Email
-

Phone
-

Journal Mail Official
widyariset@mail.lipi.go.id

Editorial Address
Pusbindiklat Peneliti-LIPI (The National Training and Education Center for Researchers Development – Indonesian Institutes of Sciences) Jl. Raya Bogor Km. 46, Cibinong Science Center Cibinong - Bogor 16911

Location
Kota adm. jakarta selatan,

Dki jakarta

INDONESIA