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Pencemaran air raksa (Hg) sebagai dampak pengolahan bijih emas di Sungai Ciliunggunung, Waluran, Kabupaten Sukabumi Widodo, Widodo
Indonesian Journal on Geoscience Vol 3, No 3 (2008)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (529.163 KB) | DOI: 10.17014/ijog.v3i3.55

Abstract

http://dx.doi.org/10.17014/ijog.vol3no3.20083Gold ore mining at Waluran Subregency, Sukabumi Regency was carried out by an underground mining method, and only rock that contains high enough gold ore would be taken (selective mining). The gold ore from the mining was processed with a direct amalgamation method, so it produced low gold concentrate, but the concentrate of mercury discarded to the river was high enough. Monitoring result of water and sedimentation in Ciliunggunung River in 2004, showed that the river was contamined by mercury (Hg), and the contamination was above the value limit. This happened especially in August 2005 where the Hg content was about 0.218 mg/l on the Ciliunggunung River in CLG.07. The chemical analysis result of heavy metals for the water of the Ciliunggunung River in CLG.07 was known to contain Fe above the standard drinking water criteria, meanwhile Mn, Cu, Pb, and As were still under the maximum drinking water criteria value. To decrease the mercury contamination, it is suggested the process of gold ore from the amalgamation direct method to be changed to the amalgamation indirect method. The indirect gold ore amalgamation process consists of: removing fine particles by washing, grinding ore, and the amalgamation phase. The total impact of the indirect amalgamation method will increase the tying of gold by mercury, so the losing of mercury will be decreased and the gain of gold will be optimum.  
Experiment of Industrial Waste Absorption using Activated Carbon from Coal of Tanjung Tabalong, South Kalimantan Gani, M. Ulum; Widodo, Widodo
Indonesian Journal on Geoscience Vol 6, No 4 (2011)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1047.147 KB) | DOI: 10.17014/ijog.v6i4.130

Abstract

DOI: 10.17014/ijog.v6i4.130Activated carbon made from Tanjung Tabalong coal was investigated its absorption capability to organic and inorganic elements in industrial waste. Coal was carbonized at low temperature of 600C to produce semicoke, and then was activated at temperature of 700C with activation time of 120 minutes with water steam flow. The absorption capability of activated carbon to chemical oxygen demand (COD) was performed using 2.5 and 9.0 g activated carbon for 250 ml and 300 ml COD waste respectively. The agitation time of each experiment were 30, 60, and 90 minutes. Atomic absorption spectrophotometer (AAS) was used to analyze the COD waste. The result shows that 2.5 g activated carbon could absorb COD waste ranging from 6.9-67.5 %, while the utilization of 9 g could absorb COD waste ranging from 88.9 - 100 %. The more activated carbon and the longer time of agitation used in this experiment, the more the absorption of COD waste.
EKSPERIMENTASI MODEL PEMBELAJARAN KOOPERATIF TIPE JIGSAW DENGAN GUIDED DISCOVERY LEARNING PADA MATERI BANGUN RUANG SISI DATAR DITINJAU DARI LOCUS OF CONTROL Widodo, Widodo; Sujadi, Imam; Riyadi, Riyadi
Jurnal Pembelajaran Matematika Vol 3, No 3 (2015): Pembelajaran Matematika
Publisher : Jurnal Pembelajaran Matematika

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Abstract: The aims of the research were to determine the effect of learning models on learning achievement viewed from the students locus of control (LOC). The learning models compared were Jigsaw by using Guided Discovery Learning (GDL), jigsaw and direct learning. The type of this research were aquasi-experimental research with the factorial design 3x3. The population were the students of the VIII class of SMP Negeri Ponorogo Regency in the academic year of 2013/2014. The samples of the research consisted of 263 students and were taken through stratified cluster random sampling. The proposed hypothesis of the research were tested by using the two-way analysis of variance with unbalanced cells. The conclusions of this research were as follows. (1) Jigsaw-GDL provided better learning achievement than jigsaw and direct instruction, while jigsaw provided better learning achievement than direct instruction, (2) the students with high LOC had better learning achievement than medium and low LOC, students with medium LOC had better learning achievement than low LOC, (3) in students with high LOC, the use of jigsaw-GDL provided learning achievement as good as jigsaw, the use of Jigsaw provided learning achievement as good as direct instruction, the use of Jigsaw-GDL provided the better learning achievement than direct instruction, in students with medium and low LOC, there were no difference in learning achievement in each learning model, (4) in Jigsaw-GDL learning model, there were no difference in learning achievement between students with high LOC and medium LOC, and both of them had better learning achievement than students with low LOC, in Jigsaw and direct learning model, there were no difference in learning achievement in each level of LOC.Keywords:  Jigsaw-GDL, Jigsaw,  Locus of Control, and Learning Achievement
APLIKASI MIKROFOTOGRAFI UNTUK MENGEKSPLORASI JENIS-JENIS CYANOPHYTA Widodo, Widodo
Jurnal Florea Vol 1, No 2 (2014)
Publisher : Jurnal Florea

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Archiving and dissemination of data , techniques, and observations of Cyanophyta required for optimization of succesfully low plant systematics studies. This paper aims to present the preparation techniques and the results of Cyanophyta algae observing with light microscope and digitaly camera. Sources accurate specimen was also informed by the author repeatedly experience in organizing learning plant systematics. Preparation and microscopic observation Cyanophyta consists of preparation of accurate source of specimens , microscopic observation to obtain optimum picture of the object and focus , shooting or recording images using a digital camera. The image files are stored and are equipped with a scale.Results of preparation , observation and shooting showed that cells and colonies all Cyanophyta (Oscillatoria , Anabaena , Nostoc ) has a similar size range that requires preparation to optimize the use of the same light microscop . Cells of Cyanophyta colonies can be seen clearly in the eyepiece magnification of 10x and 40x objective. Less than that magnification, The thalus of Cyanophyta difficult to observe because of the relatively small cell size compared to the size of eukaryotic cells. By shooting with digitaly camera, microscopy observation images can be captured as digital specimen. Observing the digitaly specimen does not change depending on season and time. The digital images can also be analyzed and studied further. Keyword : microphotography, digitaly specimen, cyanophyta , low plant systematics
MODEL PENGEMBANGAN HUMAN CAPITAL DALAM KONTEKS MODAL SOSIAL Widodo, Widodo
Benefit Volume 13 No 2 Desember 2009
Publisher : Universitas Muhammadiyah Surakarta

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Abstract

This study aims to examine the effect of in the learning orientation , commitment, the influence of human capital  on the performance of organization , the influence of commitment to human resource performance and increase in performance of organization in the context of environmental adaptability.The sampling method is purposive sampling and the number of samples is 120. The data analysis technique in this study used the Structural Equation Modelling (SEM) of the software package AMOS 4.0The study shows that when the orientation of the higher learning, the higher the commitment of human resources, if the orientation of the higher learning, the higher the intensity of human capital., When the commitment to the consensus of the higher, the higher the intensity of human capital, Human capital When the higher, the more high-performance organization, the context of high social capital moderates the structure of the equation that makes human capital influence on organizational performance
FAKTOR-FAKTOR YANG MEMPENGARUHI HARGA DAN KETERSEDIAAN BERAS DI TINGKAT NASIONAL Widodo, Widodo
SEPA - Jurnal Sosial Ekonomi Pertanian dan Agribisnis Vol 10, No 2 (2014)
Publisher : SEPA - Jurnal Sosial Ekonomi Pertanian dan Agribisnis

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Abstract

Abstract: The objectives of this study were: (1) to understand the development of domestic rice prices at the national level, (2) to identify factors that influence the domestic rice prices at the national level, and (3) to determine the factors that affect the availability of rice at the national level. The data used in this research was secondary data obtained from the BPS, BULOG, and FAO statistics. The data obtained were systematically recording in the form of a time series data since 1979 until 2008 at the national level. The model used in this research is simple regression equation or the Ordinary Least Square (OLS). This model was used to identify trends and the factors affecting the price and availability of rice nationwide. Regression equations estimated to test the functionality of R2, the F-test, t-test, and D-W.The results of this study indicate: (1) the rate of growth of retail rice prices at the national level has increased in the positive trend, (2) the domestic rice prices at the national level is influenced by the base price of grain and world rice prices, and (3) the availability of long-term national from the year 1979-2008 rice prices was influenced by domestic supply, exchange rate farmers, the harvested area, and the availability of rice before and after the moneter crisis. The availability of rice in the short term before and after the crisis were influenced significantly by harvested area, at the time of pre-crisis (1979-1997) and by domestic supply, farmers exchange rate, and the harvested area, on the time after the crisis (1997-2008).
IDENTIFIKASI KETAHANAN PLASMA NUTFAH KARET IRRDB 1981 TERPILIH TERHADAP PENYAKIT GUGUR DAUN CORYNESPORA BERDASARKAN AKTIVITAS TOKSIN CASSICOLIN Oktavia, Fetrina; Sudarsono, Sudarsono; Kuswanhadi, Kuswanhadi; Dinarty, Dini; Widodo, Widodo
Jurnal Penelitian Karet JPK : Volume 34, Nomor 1, Tahun 2016
Publisher : Pusat Penelitian Karet - PT. Riset Perkebunan Nusantara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22302/ppk.jpk.v34i1.225

Abstract

Salah satu penyakit pada tanaman karet adalah penyakit gugur daun Corynespora (PGDC) yang disebabkan oleh jamur Corynespora cassiicola. Patogen tersebut dapat menyerang semua tahap pertumbuhan tanaman karet yang menyebabkan terjadinya penurunan hasil lateks yang cukup signifikan dan bahkan dapat menyebabkan kematian tanaman. Penggunaan klon-klon tahan sebagai bahan tanam merupakan cara yang paling efektif dan ekonomis untuk mencegah terjadinya serangan PGDC. Karena itu identifikasi klon-klon resisten merupakan strategi utama dalam manajemen PGDC. Penelitian ini bertujuan untuk mengidentifikasi tingkat ketahanan 50 genotipe terpilih plasma nutfah IRRDB 1981 (PN’81) terhadap PGDC. Enam klon karet yang berasal dari populasi Wickham digunakan sebagai pembanding (BPM 24, BPM 1, GT 1, RRIC 600, PB 260 dan RRIM 600). Empat isolat C. cassiicola (CC-01, CC-20, CC-22, dan CC-23) diinokulasikan masing-masing pada daun muda tahap pertumbuhan B2C, dan intensitas kelayuan daun dihitung berdasarkan estimasi kehilangan air akibat aktifitas patogenisitas toksin. Hasil penelitian menunjukkan bahwa 12 genotipe tergolong sangat tahan, 13 genotipe tergolong tahan, 23 genotipe tergolong rentan dan 8 genotipe tergolong sangat rentan. Genotipe PN 451, PN 494 dan PN 604 menunjukkan tingkat ketahanan yang lebih baik terhadap PGDC dibandingkan dengan populasi Wickham sehingga ketiga genotipe tersebut berpotensi digunakan sebagai sumber gen ketahanan dalam program pemuliaan tanaman karet. Diterima : 13 Maret 2016 / Direvisi : 29 Juli 2016 / Disetujui : 2 Agustus 2016 How to Cite : Oktavia, F., Sudarsono, S., Kuswanhadi, K., Dinarty, D., & Widodo, W. (2016). Identifikasi ketahanan plasma nutfah karet IRRDB 1981 terpilih terhadap penyakit gugur daun Corynespora berdasarkan aktivitas toksin Cassicolin. Jurnal Penelitian Karet, 34(1), 35-48. Retrieved from http://ejournal.puslitkaret.co.id/index.php/jpk/article/view/225
GAYA BAHASA HIPERBOLA DAN ASIDENTON PANATACARA PESISIR Widodo, Widodo
SASINDO Vol 1, No 1 Januari (2013): SASINDO
Publisher : SASINDO

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Abstract

Gaya bahasa hiperbola dan asidenton Panatacara pesisir terletak pada penyimpanganpenyimpangankonotatif bahasa panatacara yang hadir melalui tuturan dalam peristiwapawiwahan. Gaya bahasa tersebut untuk menciptakan kekhasan bahasa pesisir. Hiperbola danasidenton menjadi salah satu ciri pembeda gaya bahasa di pesisiran dengan gaya bahasaSurakarta dan Yogyakarta. Selain itu, gaya bahasa hiperbola dan asidenton panatacara dalamprosesi pawiwahan adat budaya Jawa pesisiran untuk membangun makna. Hasil penelitian inimendiskripsi aspek-aspek pilihan kata yang digunakan dalam gaya bahasa hiperbola danasidenton panatacara dalam pawiwahan Jawa pesisir.Kata kunci: gaya bahasa hiperbola, asidenton , panatacara pesisir
MONITORING OF PATIENT WITH DIABETES MELLITUS Widodo, Widodo
Jurnal Ilmiah Kedokteran Wijaya Kusuma Vol 3, No 2 (2014): edisi Oktober 2014
Publisher : Universitas Wijaya Kusuma Surabaya

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Abstract

Diabetes mellitus is a disease characterized by hyperglycemia, which is caused by impaired insulin secretion, impaired insulin action, or both. Chronic hyperglycemia will lead to dysfunction and damage to various organs, such as the eyes, kidneys, nerves, heart, and blood vessels. This paper discusses the monitoring of patients with diabetes mellitus according to the laboratory tests, to know when the results of therapy has reached the optimum point as well as the prevention of complications that can occur.  
Studi Penggunaan Hidrogen Peroksida Pada Pelarutan Bijih Emas Sukabumi Selatan Dengan Larutan Sianida Supriadidjaya, Achdia; Widodo, Widodo
Jurnal Teknologi Mineral dan Batubara Vol 5, No 14 (2009)
Publisher : Puslitbang tekMIRA

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Abstract

Pengayaan oksigen pada pelindian emas menggunakan larutan sianida telah dicoba di laboratorium dengan bantuan larutan hidrogen peroksida (H2O2). Tujuan penelitian ini adalah untuk meningkatkan jumlah oksigen terlarut, menghemat pemakaian sianida, dan mempersingkat waktu pelindihan. Pelindihan dilakukan menggunakan larutan natirum sianida (NaCN) dalam gelas kimia 1.000 ml dan dilakukan secara terbuka. Konsentrasi emas hasil pelarutan dianalisis dengan spektrometer serapan atom (SSA) dan perolehan dihitung berdasarkan kadar asal. Hasil percobaan menunjukkan bahwa perolehan emas maksimum  sebesar 82,70 % Au dengan waktu pelindihan selama dua jam dengan menggunakan 0,1 g/l H2O2, 0,6 g/l garam timah hitam [Pb(NO3)2] dan 0,6 g/l natrium sianida (NaCN). Kata kunci: sianidasi, pelindian, sianida, oksidator, waktu pelindian
Co-Authors A.A. Ketut Agung Cahyawan W Abd. Rasyid Syamsuri Abdul Ghofur Abdul Hakim Abie, Tian Faoztina Abu Bakar, Kosasih Ali Achdia Supriadidjaya, Achdia Aditama, Iqbal Fauzi Aditiawardana Aditiawardana, Aditiawardana Aditya Kurniawan Admiasri, Admiasri Agus Cahyono Agus Ridwan Ahmad Romadhoni Surya Putra Ahmad Zakarsyi Alakhyar, Alakhyar Amalia Karyanto, Siti Anindya Putri Permatasari, Anindya Putri Appleton, William Ardityo R Ardhany, Ardityo R Aris Slamet Widodo Ariska, Fera Aristia, Firda Artaria Tjempakasari, Artaria Asih Kurniawati Bagus Susetyo Bandono, Adi Bangsawan, Merah Bayu Nugroho Bela Yunita, Bela Boni Pahlanop Lapanporo Cahyani, Arini Dwi Candra, Ronald Chandra Irwanadi, Chandra Dewi, Rafiqa Dhonny, Chusniati Diana Wibowo, Diana Dini Dinarty, Dini Djanggan Sargowo Djoko Santoso Dwi Hanto Dwi Sarbini Edy Waliyo Effendi, Widia Endah Kusuma Rastini Fajar Wahyono Faradila, Annisa Fatma Hetami Fatmasari, Meilita Febbiyanti, Tri Rapani FETRINA OKTAVIA Fora, Rony HR Ghaitsa, Ghaitsa Gunarti Dwi Lestari Guntur Maruto, Guntur Gusti Gina Permata Sari, Gusti Gina Hardina, dini Hardyanto Hardyanto Hasan, Husni Hulwah, Dennia Oktavia Zahidah I Ketut Atmaja Johny Artha I Nengah Tanu K Ichrom Nahzi, Muhammad Yanuar Idris HM Noor, Idris HM Iflah, Dinie Muthia Imam Sujadi indarsih, Indarsih IRA DARMAWANTI Ishafit Ishafit Islah Hayati Istanti, Rini Jazuli, Muhamad Joko Sukoyo Joko Wiyoso Kamardiani, Diah Rina Kartika Chrysti Suryandari Kharisma, Novia Nur Kirom, Dina Ashlikhatul Kudang Boro Seminar Kusharjanto, Bram Kuswanhadi Kuswanhadi, Kuswanhadi Laifa Rahmawati, Laifa Lasse, David Aroschi Lathifah, Riskhi Lathifasari, Meisera Fika Lies Mira Yusiati Limbong, Pricila Fitriasih Lis Noer Aini, Lis Noer M Thaha, M M. Ulum Gani Madjid, M. Adnan Malika, Siska Marlin, Marlin Merdeko Utomo, Verry Hendarto Mita Wahyuni Mohammad Saifur Rohman Muhammad Ishak Jumarang Muhammad Syukur Muhammad Yoga Arie Yunanto, Muhammad Yoga Mujimin - Mulyadi Mulyadi mumtazah, gita Muntasir, Adib Murhan, Al Murtiyoso, Onang Ninda Sahriyani Nugroho, Yusro Edi Nunuk Mardiana, Nunuk Nur Rahmawati Nurahman, Arip Nusantara, Widya Ochtaviani, Diana Elvira Pradipta, Monica Sonia Indri pranawa pranawa, pranawa Prastiwi, Suci Pujiastuti, Titik Pungut, Pungut Purnomo, Sucipto Hadi Puspita, Ariati Dina putra, I wayan agus suardiana R.F, Rony Haendra Rahman Hakim Rina Rina Riyadi Riyadi Rizki Hadi, Rizki Rosihan Adhani, Rosihan Rubiyanto, Cahyo Wisnu Rusdin, Muhamad Epi Ryanti W. Savitri Safitri, Rani Nur Samudra, Ami Anggraini Samudro, Eko G. Sari, Dia Novita Saulon, Butch O. Siburian, Theresia Siti Nur Aisyah Sobir Sobir Soekarba, Siti Rohmah Souhaly, Jantje Wiliem Sri Harimurti SRI HENDRASTUTI HIDAYAT Sri Rahayu Sri Sumijati, Sri Sudarsono Sudibyo Sudibyo SUDIRMAN YAHYA Suparno, Nano Suryo Wiyono Susanti Mugi Lestari Syafutri, Eka Tanu, Lenny Octaviani Titi A W Toni Kus Indratno Tri P Asmarawati, Tri P Tri Rapani Febbiyanti, Tri Rapani Triyani, Devi Tukiran Tukiran Udi Utomo Wadiyo - Wahyudi W. Parnadi wahyuni wahyuni Walton, Susan Waslaluddin MT Wati, Ira Pergiwo Wayan Tunas Artama Widiasih Widyaswari, Monica Wijaya, Oki Winarno Winarno WIWIN YULIANINGSIH Yasim, Ahmad Yudhiakto Pramudya Yundari, Yundari Zakia, Rahma zumaroh, siti Zustiyantoro, Dhoni