Effect of non-solvent additives on the structure and performance of PVDF hollow fiber membrane contactor for CO2 stripping

Microporous polyvinylidene fluoride (PVDF) hollow fiber membranes with various non-solvent additives, i.e. lithium chloride, glycerol, polyethylene glycol (PEG-400), methanol and phosphoric acid, were fabricated for CO2 stripping via membrane contactors. The membranes were characterized in terms of liquid entry pressure, contact angle, gas permeation and morphology analysis. CO2 stripping performance was investigated by using an in-house made stainless steel module with CO2-preloaded aqueous diethanolamine as the liquid absorbent. Hydrophobicity and gas permeability of the membranes reduced with the addition of a non-solvent additive in the polymer dope but increase in liquid entry pressure was observed as more sponge-like structures developed in the inner layer of the fibers. It was found that PVDF/PEG-400 membrane produced the highest stripping flux of 4.03×10-2 mol m-2 s-1 which can be correlated to its high gas permeation and high effective surface porosity. The result of long-term stripping operation indicated an approximatly 80% stripping flux reduction which can be related to the interaction of polymer membrane and amine solution at high temperature

Evaluasi Penerapan Sistem Budidaya Padi Organik di Kecamatan Petarukan, Kabupaten Pemalang

The organic agriculture system is a sustainable farming practice that has a promising solution for the sake of both food and the environment. Nevertheless, the adoption of organic systems in rice cultivation has been slowly developing due to some constraints for the lower yield than that of conventional systems. Rice production in the Pemalang region has mainly been cultivated in the district of Petarukan where some farmer grows in an organic system. This study was conducted to compare soil chemical properties i.e. pH, C-organic, N, P, and K in organic, conventional, and conversion systems of rice cultivation. In addition to the survey for collecting soil samples, the history of land management was investigated through farmer interviews. Soil samples were collected from each management type in 5 different locations using the composite sampling technique. The observed soil chemical parameters were statistically analyzed using one-way ANOVA and Tukey-test for further comparison. The result shows that the C-organic, pH, and N-total of three different cultivation systems were not different. On the other side, there was a difference among cultivation systems in P and K of the soil. This result indicates that there is a gap to fill to improve organic rice yield through enhancing soil organic matter

APPLICATION OF SMART ENVIRONMENT WITH FUZZY LOGIC METHOD BASED ON INTERNET OF THINGS

In Indonesia, air pollution is a very concern, many risks are resulting from air pollution, including the risk of blood cancer. But many people are not aware of this as a result, many are affected by respiratory infections, asthma, and lung cancer due to air pollution. Along with technological developments, a new concept emerged, namely the Internet of things, from the development of the Internet of Things, which resulted in many discoveries, one of which was the Smart Environment. With Smart Environment we can monitor the quality level of an environment, one of which is air quality. The amount of information related to air pollution is the reason for the author to make a tool that uses the Nodemcu microcontroller-based MQ7 sensor which is expected to help reduce the risk generated from air pollution, especially carbon monoxide (CO). This tool also applies the concept of the internet of things so that the results of sensor readings can be monitored online from anywhere and anytime in realtime. There is a classification of air pollution levels in this tool including healthy air, unhealthy air, and dangerous air, healthy air is in the value range 0-100 PPM, unhealthy air is in the value range of 100-200 PPM, and dangerous air is in the value range> 200 PPM. Fuzzy logic was chosen as the method in this research because this method is suitable for most real-time problems such as making decisions to determine the level of air pollution that is uncertain and changing. The results of the MQ7 sensor detection of carbon monoxide are monitored through the Indonesian-made Internet of Things platform, Antares.id

Peningkatan Perilaku Berkarakter Dan Keterampilan Berpikir Kritis Siswa Kelas IX Mtsn Model Padang Pada Mata Pelajaran Ipa-fisika Menggunakan Model Problem Based Instruction

Problems are often encountered in learning science Physics in class IX of MTsN Model Padang is the process of learning science Physics is less meaningful because the matter is less related to problems in daily life. This indicates that the behavior of character and critical thinking skills students in grade IX is still low. In addition, variations in the model / learning methods are applied to teachers in the classroom learning process is still lacked. The purpose of this study is to improve character\u27s behavior and critical thinking skills of students in grade IX MTsN Model Padang on Physics science use Problem Based Instruction model. This type of study is classroom action research. The research was carried out in class IX. 9 MTsN Model Padang in two cycles that began in November 2011 to December 2011. Data obtained through the research instrument, namely: the behavior observation sheet character, character\u27s behavior is limited questionnaire given to students each end of the cycle, and critical thinking skills test is conducted every meeting and analyzed by percentage analyze techniques (%). The study found there was an increase of 15.39% characterized the behavior of the criteria began to develop into 45.61% of students are on begins to develop criteria (MB), and 21.84% on the custom criteria (MK). Analysis of the character\u27s behavior questionnaire also showed that an increase of 38.71% criteria began to grow (MB) and 1.79% in the custom criteria (MK) to 59.15% in the criteria began to grow (MB) and 7.84% the criteria into the habit (MK). The analysis of critical thinking skills showed that there was an increase from 54.62 to 11.37 percentage completeness with a percentage of 75.14% to 63.91% completeness. Based on the research results can be concluded that the application of the model problem based instruction can improve students\u27 behavior that characterized the impact on critical thinking skills

Collaborative and Cooperative Learning in Malaysian Mathematics Education

Collaborative and cooperative learning studies are well recognized in Malaysian mathematics education research. Cooperative learning is used to serve various ability students taking into consideration of their level of understanding, learning styles, sociological backgrounds that develop students' academic achievement and skills, and breeze the social harmony among students of different ethnic backgrounds. Besides academic achievement, process skills and values are required to extend the social harmony among students in today's multiethnic schools. Therefore, teachers are expected to find the pedagogy that enables students to learn academic knowledge and professional skills to face the challenges in their everyday lives. The Malaysian scholars, based on the findings of their cooperative learning studies, emphasized the use of cooperative learning as an effective pedagogy with the aim to improve students' mathematics achievement and communication skills. This paper describes the role of collaborative and cooperative learning to the development of students' mathematics achievement along with their communication skills and with significant integration of values in Malaysian mathematics education

Collaborative and Cooperative Learning in Malaysian Mathematics Education

Collaborative and cooperative learning studies are well recognized in Malaysian mathematics education research. Cooperative learning is used to serve various ability students taking into consideration of their level of understanding, learning styles, sociological backgrounds that develop students' academic achievement and skills, and breeze the social harmony among students of different ethnic backgrounds. Besides academic achievement, process skills and values are required to extend the social harmony among students in today's multiethnic schools. Therefore, teachers are expected to find the pedagogy that enables students to learn academic knowledge and professional skills to face the challenges in their everyday lives. The Malaysian scholars, based on the findings of their cooperative learning studies, emphasized the use of cooperative learning as an effective pedagogy with the aim to improve students' mathematics achievement and communication skills. This paper describes the role of collaborative and cooperative learning to the development of students' mathematics achievement along with their communication skills and with significant integration of values in Malaysian mathematics education

Pengembangan Perangkat Pembelajaran Fisika Menggunakan Model Guided Inquiryyang Dilengkapi Penilaian Portofolio Pada Materi Gerak Melingkar

KTSP in high school physics teaching requires learning device according to the characteristics of the material. In reality not yet available learning devices that require students to think scientifically and found the concept itself. On the other hand, teachers are expected to conduct classroom-based assessments, one of which is the assessment of the portfolio, a collection of works by students that is organized by interest, progress, achievement, and creativity of students in a specified period. How the development of learning physics using guided inquiry equipped models portfolio assessment in a circular motion of matter has not been developed. The research objective is to develop the learning of physics using guided inquiry equipped models portfolio assessment at the circular motion of matter are valid, practical and effective.This type of research is the development of research using model 4-D. Research procedures are define stage set and define the conditions of learning such as analysis of curriculum, learner analysis and concept analysis. Design phase is to prepare the device prototype stage of learning and development is done validity, and effectiveness of the learning practicality. The validity of the data collection instrument is a validation sheet RPP, modules, worksheets and portfolio assessment. Practicality data collection instruments are observation sheets and questionnaires practicality. Effectiveness of data collection instrument is the observation sheet and portfolio assessment.Validity of test results of the study obtained an average percentage value validation RPP was 84.6%, the module is 82% and LKS is 82.8%, this means that the category of learning is very valid, while the conclusion is valid assessment form without revision. Furthermore, the practicality of obtaining test results mean percentage of the value of practicality by a teacher questionnaire on RPP was 98%, the module is 96.5% and LKS was 96% and the percentage of the average value of the practicality of a questionnaire by the students on the module is 87.4% and LKS is 89.8% with the learning tools category that developed very practical. Furthermore, the effectiveness of the test result is the average value of the class students in the cognitive 66.7, affective domains is 61.2, psychomotor domains is 68 and the percentage of the average effectiveness base students activity is 86,3% . Conclusion of research is learning software developed very valid, very practical and effective

Pengaruh Simulasi Awal Data Pengamatan terhadap Efektivitas Prediksi Pasang Surut Metode Admiralty (Studi Kasus Pelabuhan Dumai)

This research to examines the initial variation of observation data based on Hijricalendar, because the initial time of observation data will affect the value of the resultingtidal components. The data was simulated against one hundred and thirty-five variationsof observation time. The result of data analysis shows that the smallest RMSE value fromthe verification result of the simulation data is found on the data of the early date of 12Hijri calendar is when the phase of the first humpback moon. This indicates that the timevariation of the date of the observation of the matching observation data at the study siteis between approaching the full moon phase and after the full moon phase. The F valueindicates that the location of the study entered on the classification of the daily doubletide type (semi diurnal tide)