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RECOVERY GARAM LITHIUM DARI AIR ASIN (BRINE) DENGAN METODA PRESIPITASI Sumarno, Sumarno; Ratnawati, Ratnawati; A. Nugroho, A. Nugroho
TEKNIK Volume 33, Nomor 2, Tahun 2012
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (51.65 KB) | DOI: 10.14710/teknik.v33i2.4387

Abstract

Lithium demand increases as it is widely used as raw material for rechargeable battery, alloy for airplane, andfuel for fusion nuclear reactor. Lithium is an extremely reactive element, that it is never found as free element innature. Lithium compounds are found in earth crust, with very small concentration (20 – 70 ppm) and totalcontent of more than 20 million tons. The biggest lithium reserve is in seawater (0,14 – 0,25 ppm) andgeothermal water (7 ppm) with total amount of 230 billion tons. There is no industry applies the technology torecover lithium from seawater. Having a vast sea area and abundant geothermal sources, Indonesia needs todevelop a technology to recover lithium from both sources. This research is aimed to recover lithium fromgeothermal water. The experiment was conducted using synthetic and geothermal water with lithiumconcentration range of 220 – 400 ppm, temperature range of 20 – 40°C, and mixing time range of 1 – 4 hours.The experiment was designed with 2 level factorial design. The results show that the most influencing variable ismixing time, while significant interaction amongst variables is not observed. Further experiment usinggeothermal water from Bledug Kuwu with initial lithium concentration of 400 ppm and temperature 30°Cresulted in optimum mixing time, i.e. 3 hours with 92,5% of the lithium could be recovered
PERAN LABA MEMODERASI HUBUNGAN MODAL KERJA DAN BIAYA EKUITAS (Studi Kasus pada Perusahaan Manufaktur di Bursa Efek Indonesia) Ratnawati, Ratnawati
Students Journal of Economic and Management Vol 1, No 1 (2012): VOL. 1 NO. 1 EDISI PERTAMA 2012
Publisher : Students Journal of Economic and Management

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Abstract

This study aimed to examine the effect of Nibe to Working Capital Gain and equity costs of case studies on the effects of manufacturing companies on Bursa Efek  Indonesia (BEI). The samples used in this research is a group of companies manufacturing the category of companies whose shares are actively traded on the Stock Exchange always during peeode observations (2007-2010). The number of samples obtained by category amounted to 19 companies over a period of 4 years. Secondary data was obtained from the Indonesia Stock excange (IDX) annual statistics for the period 2007 to 2010. The analysis used in this study is multiple regression techniques (multiple regression) to test the hypothesis t-test and F-test at the 5% level of significance (α = 0.05). Hypothesis test results indicate that the variable income and variable working capital Nibe together equally significant effect on the cost of equity. This result indicates that these two variables are jointly able to significantly influence the cost of equity. The test results also found that working capital and cost of equity has a negative and significant effect, because it has the value of the Standardized Beta Coefficiens 0000 0601 and its significance is greater than alpha (0.05). Keywords: Nibe earnings, working capital, cost of equity
Analysis of Culture Shock Experienced by The New Students of English Department In Faculty of Letters UMI Makassar Hudriati, Andi; Ratnawati, Ratnawati; Riskawati, Riskawati
Tamaddun Life Vol 16 No 1 (2017): June 2017
Publisher : Fakultas Sastra - Universitas Muslim Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33096/tamaddunlife.v16i1.47

Abstract

This study aimed to know the kinds of culture shock do the new students of English literature find in communication and to find out the kinds of solution to overcome culture shock problems of the new students. The type of this study is qualitative description that is aim to explain about the culture shock experienced by the new students in campus UMI Makassar. Data collected in the form of words in written or oral. The researcher found that there two things in this research. The first are three kinds of culture shock do the new students found in communication, such as, language, culture, and level of context. The second is to find out the kinds of solution to overcome culture shock problems of the new students. Such as, learn the local language, make local friends, be patient, keep an open mind, do things that are familiar to you, and try to accept the condition.
The Description and Meaninings of Proverbs To-Riolo of Buginese Tribe in South Sulawesi ( A Semantical Analysis ) Jannah, Hariratul; Ratnawati, Ratnawati; Fatimah, Sitti
Tamaddun Life Vol 16 No 1 (2017): June 2017
Publisher : Fakultas Sastra - Universitas Muslim Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33096/tamaddunlife.v16i1.45

Abstract

The is a scientific work which aims to explain about the meaning of proverbs to-riolo buginese tribe. This research is a qualitative research. The data collected by observation, interview and also research library. The scope of the research is in Watampone bone, South Sulawesi.Proverb to-riolo had four basic (1) bravery (2) wealth (3) honesty and (4) intelligence. The findings of this research after collected data and interviewed other about proverb to-riolo the writer can conclude that proverb to-riolo is a culture of buginese. This Proverb was way how to communication to others and apply the good attitude. The research is meant to preserve and provide additional knowledge and insights of classical literature in South Sulawesi
The Ability of Course Students and Non Course Students at SMPN 19 Moncongloe in Reading Comprehension Halijah, Sitti; Ratnawati, Ratnawati; Ratnasari, Ratnasari
Tamaddun Life Vol 15 No 2 (2016): December 2016
Publisher : Fakultas Sastra - Universitas Muslim Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33096/tamaddunlife.v15i2.43

Abstract

This study aims to determine the differences in learning outcomes between students which follows the course of study with students who do not join the course in terms of. Lessons English lessons are considered difficult by most students. This is caused by many factors diantanya class hours less, the lack of professionalism of teachers, learning styles unpleasant and so forth. To that end, so that more students master the learning should be given an extra hour, one of them with learning course program. The course is a proactive and systematic efforts in facilitating individuals achieve optimal levels of development, the deve opment of effective behavioral, environmental, and an increase in function or benefit of individuals in their environment. The population in this study is the whole class at SMPN 19 MONCONGLOE. sample includes 20 Siwa took courses and 20 students who did not join the course. In the data collection writers do the following things, namely observation, documentation, and giving the test tothe two groups. The results showed that there were differences in learning outcomes in literacy significant with an average of 90% for students who take courses to learn and 80% for students who do not follow the course to determine whether there are differences in the ability to read the learning outcomes of the two groups, the researchers used data analysis is test test, this is because the data obtained from this research is the normal data differences in learning outcomes of reading skills among students who take courses to learn with students who are not taking a course.
STUDI ANALISIS VARIANS RANKING DUA- ARAH FRIEDMAN TERHADAP KOMPETENSI DIMENSI PENGETAHUAN AUDITOR DI KANTOR AKUNTAN PUBLIK JAKARTA Ratnawati, Ratnawati; Samosir, Perak
MAJALAH ILMIAH WIDYA 2012
Publisher : MAJALAH ILMIAH WIDYA

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Abstract

In conducting the auditing, the auditor should have the competence dimension of knowledge. It can be analyzed through therespondents answers to the statements relating to the competence dimension of knowledge of an auditor. The purpose of this studyis to see if there is a statement to the effect of the respondents answer and whether there is a correlation between the grain statements.The method used analysis of auditor competence dimension of knowledge in performing auditing and other data collected byquestinaires distributed to 30 Public Auditor offices in Jakarta. The result showed that no significant differences from respondentsanswers to the statement items relating to the auditor’s competence of knowledge dimension
Hubungan Pengetahuan, Perilaku dan Lingkungan Rumah dengan Kejadian Transmisi Tuberkulosis Paru di Wilayah Kerja Puskesmas Bandarharjo Semarang Zulaikhah, Siti Thomas; Ratnawati, Ratnawati; Sulastri, Neng; Nurkhikmah, Eli; Lestari, Novi Dian
Jurnal Kesehatan Lingkungan Indonesia Vol 18, No 2 (2019): Oktober 2019
Publisher : Master Program of Environmental Health, Faculty of Public Health, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jkli.18.2.81-88

Abstract

Latar belakang: Tuberkulosis paru adalah penyakit menular yang disebabkan oleh bakteri mycobacterium tuberculosis masih menjadi masalah kesehatan. Tingginya angka kejadian TB paru dapat dikarenakan adanya faktor tingkat pengetahuan yang rendah, perilaku kesehatan yang buruk dan lingkungan rumah seperti ventilasi, pencahayaan, kelembaban, kepadatan hunianyang tidakmemenuhi syarat. Tujuan penelitian ini untuk mengetahui variabel paling dominan berhubungan dengan transmisi kejadian TB paru di Wilayah Kerja Puskesmas Bandarharjo Kota Semarang.Metode: Desain penelitian observasional dengan pendekatan case control. Subjek penelitian terdiri dari 40 kasus dan 40 kontrol. Kasus merupakan penderita TB paru di Puskesmas Bandarharjo yang didiagnosis secara klinis dan laboratorik BTA positif dan tercatat dalam medical record dari bulan Agustus 2016 sampai Agustus 2017,kontrol merupakan tetangga kasus yang tidak terdiagnosis TB paru BTA positif dan anggota keluarga tidak menderita TB paru BTA positif. Teknik sampling menggunakan proporsional random sampling. Data yang terkumpul dianalisis dengan uji univariat menggunakan distribusi frekuensi, uji bivariat menggunakan Chi Square, uji Multivariat menggunakan Regresi logistik ganda. Hasil : Hasil uji bivariat variabel lingkungan yang terdiri dari luas ventilasi (p=0,000); kepadatan hunian (p=0,000); kelembaban (p=0,001); pencahayaan (p=0,001); suhu (p=0,001), sedang hasil variabel pengetahuan (p=0,002) dan perilaku (p=0,005). Hasil analisis multivariat variabel pengetahuan (OR=3,776); kepadatan hunian (OR=4,476); kelembaban (OR=4,030); pencahayaan (OR=3,635); suhu (OR=3,064); pengetahuan (OR=6,374); perilaku (OR=3,525).Simpulan: Lingkungan rumah, pengetahuan dan perilaku berhubungan dengan kejadian TB paru di wilayah kerja puskesmas Bandarharjo Semarang dan faktor yang paling dominan berhubungan adalah pengetahuan. ABSTRACTTitle: Relationship Knowledge, Behavior and Household Environmentwith the Transmission Insidence Pulmonary Tuberculosis in the Work Area of Bandarharjo Health Center SemarangBackground: Pulmonary tuberculosis, an infectious disease caused by the bacterium Mycobacterium tuberculosis remains a health problem. A higher incidence of pulmonary TB has been associated with low level of knowledge, poor health behavior and household environment such as ventilation, lighting, humidity, residential density. The purpose of this study was to identify the most dominant factor associated with the transmission pulmonary TB in the Bandarharjo Health Center in Semarang.Methods: The research was an observational one with a case control study. The case and the control of this research were both using 40 respondents. The case was patients clinically diagnosed with pulmonary TB and has a laboratory BTA+ and documented in the medical record from August 2016 to August 2017. The control was a neighbor of cases with no BTA+ (acid resistant bacilli) pulmonary TB and history of family no BTA+ of pulmonary TB. The proportional random sampling was applied. The collected data were analyzed using univariate test of frequency distribution, bivariateof Chi Square, multivariate oflogistic regression.Results: Bivariate test of environmental variables consisting of ventilation area (p = 0.000); occupancy density (p = 0.000); humidity (p = 0.001); lighting (p = 0.001); temperature (p = 0.001), while the results of the knowledge variable (p = 0.002) and behavior (p = 0.005). The multivariate analysis showed variable of knowledge (OR = 3.776); residential density (OR = 4.476); humidity (OR = 4.030); lighting (OR= 3.635); temperature (OR = 3.064); knowledge (OR = 6.374); behavior (OR = 3.525).Conclusion: The household environment, knowledge and behavior were related to the transmission incidence of pulmonary tuberculosis in the working area of Bandarharjo health center and the most dominant factor was knowledge.
DEVELOPING THEMATIC ENGLISH MULTIMEDIA FOR TEACHING VOCABULARY TO YOUNG LEARNERS Ratnawati, Ratnawati
Language Circle: Journal of Language and Literature Vol 9, No 1 (2014): October 2014
Publisher : Faculty of Languages ​​and Arts, State University of Semarang

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Abstract

The observed inappropriateness comes from textbooks used in teaching young learners are too difficult, dominated by written form, unspecific, and decontextualized interactive multimedia. Hence, the researcher would like to develop Thematic English Multimedia (TEM) for teaching vocabulary to young learnersat kindergarten B of Islamic Centre Purwodadi, Grobogan. This study employed R&D Design proposed by Borg and Gall (2003:772). Seven stages employed were information and research collecting, planning, developing, validating, revising, try out, and producing final TEM. Observation, interview, validation, performance-based assessment, and pre also post-test were administered to collect data. From results of collected data, they were found that applying TEM got positive perspectives toward teaching and learning process. In line with above statements, TEM is effective and feasible to teach young learners at kindergarten B of Islamic Centre Purwodadi, Grobogan.
PENINGKATAN HASIL BELAJAR KETERAMPILAN MENULIS PUISI DENGAN TEKNIK AKROSTIK MELALUI METODE GALLERY OF LEARNING (GALERI BELAJAR) SISWA KELAS VIII SMP NEGERI SATU ATAP PUNAGA KEC. MANGNGARABOMBANG KABUPATEN TAKALAR Ratnawati, Ratnawati
JKIP (Jurnal Keguruan dan Ilmu Pendidikan) Vol 1 No 2 (2014): JKIP
Publisher : Fakultas Keguruan dan Ilmu Pendidikan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (7.602 KB)

Abstract

Penelitian ini bertujuan untuk meningkatkan keterampilan menulis puisi dengan dengan teknik akrostik pada siswa kelas VIII SMP Negeri Satu Atap Punaga Kec. Mangngarabombang Kab. Takalar. Penelitian ini bersifat deskriptif kulitatif. Jenis penelitian ini adalah penelitian tindakan kelas (Class Action Reaserch) yang terdiri dari dua siklus dimana dua siklus dilaksanakan sebanyak dua kali pertemuan. Prosedur penelitian meliputi perencanaan, pelaksanaan tindakan, observasi dan refleksi. Subjek dalam penelitian ini adalah siswa kelas VIII SMP Negeri satu atap Punaga kec. Mangngarabombang kab. Takalar sebanyak 15 siswa. Hasil penelitian ini menunjukkan bahwa pada siklus pertama yang tuntas secara individual dari 15 siswa hanya 2 siswa dengan persentase 6,06% yang memenuhi ketuntasan kriteria minimal (KKM) atau berada pada kategori rendah. Secara klasikal belum terpenuhi karena nilai rata-rata diperoleh sebesar 59,18%%. Sedangkan pada siklus II dimana dari 15 siswa dengan persentase 100% dan telah memenuhi KKM dan secara klasikal sudah terpenuhi yaitu nilai rata-rata yang diperoleh sebesar 77,54% atau berada pada kategori tinggi. Berdasarkan hasil penelitian tersebut diatas, dapat disimpulkan keterampilan menulis puisi dengan teknik akrostik pada siswa kelas VIII SMP negeri satu atap Punaga kec. Mangngarabombang keb. Takalar melalui metode gallery of  learning mengalami peningkatan.
Modifikasi Pati Sukun (Artocarpus Altilis) dengan Teknik Oksidasi Menggunakan Hidrogen Peroksida Tanpa Katalis Budiyati, Catarina Sri; Kumoro, Andri Cahyo; Ratnawati, Ratnawati; Retnowati, Diah Susetyo
TEKNIK Vol 37, No 1 (2016): (Juli 2016)
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1232.848 KB) | DOI: 10.14710/teknik.v37i1.9832

Abstract

Salah satu sumber bahan pangan lokal yang belum banyak dimanfaatkan adalah buah sukun (Artocarpus Artilis) yang cukup banyak terdapat di Indonesia. Akan tetapi, pemanfaatan buah sukun terkendala pada kurangnya daya simpan buah segar. Oleh karena itu, perlu dilakukan upaya untuk meningkatkan pemanfaatan buah sukun dengan mengolahnya menjadi produk yang lebih luwes dengan daya simpan yang lebih baik, yaitu menjadi pati sukun. Sifat-sifat pati sukun perlu diperbaiki agar dapat digunakan sebagai pengganti tepung terigu. Tujuan dari penelitian ini adalah untuk memodifikasi pati sukun dengan cara oksidasi menggunakan larutan hidrogen peroksida. Dalam penelitian ini dikaji pengaruh konsistensi luluhan, konsentrasi hidrogen peroksida, waktu, dan suhu terhadap karakteristik fisikokimia pati sukun teroksidasi yang dihasilkan dan ditentukan kondisi optimalnya. Hasil penelitian menunjukkan bahwa semua variable yang dikaji tersebut mempengaruhi reaksi oksidasi pati sukun. Oksidasi pada konsistensi luluhan 20%, konsentrasi hidrogen peroksida 2% dan suhu 50°C mampu menghasilkan nilai swelling power dan water solubility yang terbaik. Reaksi oksidasi tidak mengubah struktur dan morfologi pati sukun termodifikasi secara signifikan.   [Title: Modification of Breadfruit (Artocarpus altilis) starch through non-catalytic hydrogen peroxide oxidation] One of local source of food that has not been intensively explored is breadfruit (Artocarpus Artilis). However, the utilization of breadfruit is limited by the poor storage properties of the fresh fruit. Therefore, efforts should be made to improve the utilization of breadfruit to process it into more flexible products with better storability, suach as breadfruit starch. Breadfruit starch properties need to be improved so that it can be used to substitute wheat flour. The aim of this study was to modify the breadfruit starch by oxidation using hydrogen peroxide solution. This work studied examined the influence of consistency of starch slurry, hydrogen peroxide concentration, time, and temperature on the physicochemical properties of the oxidized breadfruit starch. The optimal conditions were also determined. The results showed that all of these variables affected the oxidation of starch breadfruit. The oxidation on starch slurry with consistency 20%, the concentration of hydrogen peroxide of 2%, and temperature of 50°C produced modified starch with best swelling power and water solubility. The oxidation did not significantly change the structure and morphology of the modified starch.
Co-Authors A. Nugroho A. Nugroho A.A. Ketut Agung Cahyawan W Agus Purwanto Amalia, Faradiba Amin Nugroho Amini, Rif'atul Andi Rustandi Andri Cahyo Kumoro Andri Cahyo Kumoro Anggriani, Ruci Aryadi Suwono Aryadi Suwono Asiyah Mumtahanah Khoiruzzahra Budiwati Budiwati Cahyati, Nika Catarina Sri Budiyati Cindi Yasintasia Damin Hartono Dea Julianti Siswoyo Decy Lukitasari Diah Susetyo Retnowati Didih Faridah, Didih Edi Haryanto Eka Budiarto, Eka Eka Sartika, Eka Elis Sofianti Enda Puspitasari Faisal Yunus Fenny Roshayanti Ferliyanti, Herlina Fitri, Alchonity Harika Frista, Rhoito Fuad, Muhammad Ulil H.M Samudro Haliah Batau Halijah, Sitti Handayani, Aniek Sri Hartono, Damin Hasan Basri Hasriani Hasriani, Hasriani Hudriati, Andi Indah Sukmawati Iyus Hendrawan J Morton Jannah, Hariratul Jerniati I. Johannes Leonard Joko Siswanto Khazali, Imam Khoirunnisa, Mega Lestari Kolewora, Yusuf Musafir Kusumah, Rita La Harudu Latukau, Hasni Lestari, Novi Dian Livana Ph, Livana Maelasari, Rika Maharani Ratridewi MEDTRY, Medtry Mia Andinawati Mohamad Djaeni Mohamad Djaeni Mohamad Djaeni Musayyedah Musayyedah nanang nanang Nanang Nanang Nurani, Desi Nurfitriana , Eva Nurkhikmah, Eli Nurrrahmi, Maftuhah P S Thomas Patimah Ulwiyah Perak Samosir Puspita, Mutiara Eka R L Henry Rahma Ayu Maharani Ratnasari Ratnasari Riskawati Riskawati, Riskawati Rita Kartika Sari Rosmiaty Rosmiaty Said Mirza Pahlevi Said Mirza Pahlevi Salam, Rusdiah Saludung, Jokebet Samudro, H.M Santoso, Ririn Setyorini Setyorini Silalahi, Oberlin Siregar, Nursyahid Siti Thomas Zulaikhah Sitti Fatimah Slamet Slamet Sugandi, Kukuh Sugeng, Purwito Sulastri, Neng Sumarno Sumarno Supriyanto, Muhammad Agus Suratsih Suratsih Surdin, Surdin Suryani Yuliyanti, Suryani Suwarly Mobiliu Tarwana, Wawan Tavip Dwi Wahyuni Thoyyibah, Luthfiyatun Tomayahu, Mansyur B. Ulfa Ramadhani Nasution V Nguyen Wenny Pebrianti Widya Apriliah, Widya Yayu Sri Rahayu Yenny Widianty, Yenny yumni, andi Zulkifli N