Articles

TRADE ACTIVITIES BEHAVIOR OF INTRAHARI IN JAKARTA STOCK EXCHANGE

Jurnal Ilmiah Ekonomi Bisnis Vol 13, No 1 (2008)
Publisher : Universitas Gunadarma

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Abstract

The primary objective of this study is to investigate the pattern of intraday trading within industrial sector which are listed in LQ45 and the domination of telecommuniaction sector in trading activities at the Jakarta Stock Exchange. An examination on the behavior of intraday stock trading activities at the Jakarta Stock Exchange in the period between 2002 and 2003 is accomplished in this study. Trading activities used in this study were volatility of return, volatility of stock price, volume of trading (based on transactions), spread, relative spread, depth, and relative depth (based on order). Approximately 8 millions trading activities were particized into time interval of 30 minutes. Regression analysis with dummy variable for independent variable was applied. Results of the study showed that there were high means of trading activities both at the beginning and the end of trading. This finding is in accordance with a number of theories and results of several empirical studies which indicate that trading behaviors in each capital market are varied. In addition, it was also indicated that trading activities at the Jakarta Stock Exchange, rather thanby telecommunication sector, were dominated by financial sector.Key words: intraday trading; stock trading behavior; capital market.

PERILAKU AKTIVITAS PERDAGANGAN INTRAHARI DI BURSA EFEK JAKARTA

Jurnal Ilmiah Ekonomi Bisnis Vol 13, No 1 (2008)
Publisher : Universitas Gunadarma

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Abstract

The primary objective of this study is to investigate the pattern of intraday tradingwithin industrial sector which are listed in LQ45 and the domination oftelecommuniaction sector in trading activities at the Jakarta Stock Exchange. Anexamination on the behavior of intraday stock trading activities at the Jakarta StockExchange in the period between 2002 and 2003 is accomplished in this study. Tradingactivities used in this study were volatility of return, volatility of stock price, volume oftrading (based on transactions), spread, relative spread, depth, and relative depth(based on order). Approximately 8 millions trading activities were particized into timeinterval of 30 minutes. Regression analysis with dummy variable for independentvariable was applied. Results of the study showed that there were high means oftrading activities both at the beginning and the end of trading. This finding is inaccordance with a number of theories and results of several empirical studies whichindicate that trading behaviors in each capital market are varied. In addition, it wasalso indicated that trading activities at the Jakarta Stock Exchange, rather than bytelecommunication sector, were dominated by financial sector.

PERILAKU AKTIVITAS PERDAGANGAN INTRAHARI DI BURSA EFEK JAKARTA

Jurnal Ilmiah Ekonomi Bisnis Vol 13, No 1 (2008)
Publisher : Universitas Gunadarma

Show Abstract | Original Source | Check in Google Scholar | Full PDF (72.038 KB)

Abstract

The primary objective of this study is to investigate the pattern of intraday tradingwithin industrial sector which are listed in LQ45 and the domination oftelecommuniaction sector in trading activities at the Jakarta Stock Exchange. Anexamination on the behavior of intraday stock trading activities at the Jakarta StockExchange in the period between 2002 and 2003 is accomplished in this study. Tradingactivities used in this study were volatility of return, volatility of stock price, volume oftrading (based on transactions), spread, relative spread, depth, and relative depth(based on order). Approximately 8 millions trading activities were particized into timeinterval of 30 minutes. Regression analysis with dummy variable for independentvariable was applied. Results of the study showed that there were high means oftrading activities both at the beginning and the end of trading. This finding is inaccordance with a number of theories and results of several empirical studies whichindicate that trading behaviors in each capital market are varied. In addition, it wasalso indicated that trading activities at the Jakarta Stock Exchange, rather than bytelecommunication sector, were dominated by financial sector.

Correlation Between TNF- α and Degree of Gastritis

The Indonesian Journal of Gastroenterology, Hepatology, and Digestive Endoscopy Vol 19, No 1 (2018): VOLUME 19, NUMBER 1, April 2018
Publisher : The Indonesian Journal of Gastroenterology, Hepatology, and Digestive Endoscopy

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Abstract

Background: TNF- α is a cytokine that plays an active role in the pathogenesis of gastritis. The correlation of TNF-α levels in the gastric mucosa with the severity of gastritis has long been known. However, few studies have assessed TNF-α levels in serum of gastritis patients. This study aims to evaluate correlation between serum TNF-α level with the degree of gastritis based on histopathology.Method: A cross sectional study on eighty gastritis patients that fulfilled the inclusion criteria underwent serum TNF-α examination, endoscopy, and biopsy. Rapid urease test was used for diagnosis of H. pylori infection. The severity of gastritis based on lymphocyte infiltration, neutrophil infiltration, atrophy, and intestinal metaplasia according to Updated Sydney System. Univariate and bivariate analysis (Chi-square, fishers exact, spearman correlation, and independent T-test) were done using SPSS version 22.Results: There were 41.25% patients infected with Helicobacter pylori. Serum TNF-α levels in the infected group were significantly higher compared to negative H. pylori (p < 0.05). There was significant positive correlation between serum TNF-α levels and degree of gastritis based on lymphocyte infiltration (r = 0.333; p = 0.003).Conclusion: There was a significant positive correlation between serum TNF-α level with the severity of gastritis based on lymphocyte infiltration.

Adsorption of Anion Dye from Aqueous Solution by Activated Carbon Coated Monolith in a Batch System

Jurnal Rekayasa Kimia & Lingkungan Vol 7, No 4 (2010): Jurnal Rekayasa Kimia & Lingkungan
Publisher : Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia

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Abstract

The adsorption of an anion dye, methyl orange, from aqueous solutions on polymer based carbon coated monolith was studied in a batch system. The kinetics of adsorption with respect to the initial dye concentration was investigated. Langmuir and Freundlich isotherms were applied to describe the experimental data. Equilibrium data fitted well to the Freundlich model for concentration range (0 – 160 mg/L). The maximum adsorption capacity of the carbon with BET surface area of 431 m2/g obtained from the Freundlich model was 36.72 (mg/g) (L/mg)1/n. The pseudo-first-order and pseudo-second-order kinetic models were employed to describe the kinetic data. The experimental data fitted well to the pseudo-second-order kinetic model with constant rates 5.42x10-4 and 2.22x10-4 g/(min-mg) for initial concentrations 50 and 100 mg/L, respectively. Keywords: adsorption, anion dye, carbon coated monolith

Pengolahan Limbah Cair Laundry Menggunakan Membran Selulosa Diasetat Berbasis Selulosa Pulp Kayu Sengon (Paraserianthes falcataria)

Jurnal Rekayasa Kimia & Lingkungan Vol 9, No 3 (2013): Jurnal Rekayasa Kimia & Lingkungan
Publisher : Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia

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Abstract

The improvement of laundry activity brought a negative effect on the environment because laundry wastewater have a high content pollutants such as phosphate, surfactants, mineral, nitrogen, COD and other components, so the treatment is needed before being discharged into terristorial water. Laundry wastewater treatment has been conducted by membrane technology. Preparation of cellulose diacetate  membranes with ultrafiltration process had be done by phase inversion using dimethylformamide (DMF) as a solvent. The filtration experiment showed that the highest membrane flux was 77,408 L/m2.h at TMP 3 bar. While the lowest flux at TMP 1 bar was 55.649 L/m2.h. Rejection of membrane ultrafiltration for parameters of COD, phosphate, and surfactant were 67%, 72%, and 63% respectively.Keywords: cellulose diacetate membranes, laundry wastewater, flux, rejection

Linear Driving Force Model for Adsorption onto Activated Carbon Monolith

Jurnal Rekayasa Kimia & Lingkungan Vol 5, No 1 (2006): Jurnal Rekayasa Kimia & Lingkungan
Publisher : Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia

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Abstract

A mathematical model on carbon coated   monolith   using the  linear driving force model is develop. The computer program is writted in MATLAB and simulation using data from [4] for cell density 200 cpsi was used to studies the effect of different variables on breakthrough profiles.  The result showed that the breakthrough curve of the monolith is very sharp. Because of its an open structure and  lower pressure drop,   monolith  is an attractive alternative internals for separation.Keywords:  Adsorption, modeling, simulation, carbon coated monolith, breakthrough

Pengolahan Limbah Cair Pabrik Pupuk Urea Menggunakan Advanced Oxidation Processes

Jurnal Rekayasa Kimia & Lingkungan Vol 10, No 1 (2014): Jurnal Rekayasa Kimia & Lingkungan
Publisher : Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia

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Abstract

Limbah cair pabrik pupuk urea terdiri dari urea dan amonium yang masing-masing mempunyai konsentrasi berkisar antara 1500-10000 ppm dan 400-3000 ppm. Konsentrasi urea yang tinggi di dalam badan air dapat menyebabkan blooming algae dalam ekosistem tersebut yang dapat mengakibatkan kehidupan biota air lain terserang penyakit. Peristiwa ini terjadi karena kurangnya nutrisi bagi biota air dan sedikitnya sinar matahari yang dapat menembusi permukaan air. Disamping kedua hal tersebut di atas, algae juga dapat memproduksi senyawa beracun bagi biota air dan manusia. Penelitian ini bertujuan untuk mengolah urea menggunakan oksidasi konvensional (H2O2) dan Advanced Oxidation Processes (kombinasi H2O2-Fe2+) pada pH 5 dengan parameter yang digunakan adalah variasi konsen-trasi awal H2O2  dan konsentrasi Fe2+. Hasil percobaan menunjukkan bahwa penurunan konsentrasi urea tertinggi diperoleh pada penggunaan reagen fenton (8000 ppm H2O2 dan 500 ppm Fe2+), yaitu dapat menurunkan urea dari konsentrasi awal urea 2566,145 ppm menjadi 0 ppm. Kinetika reaksi dekomposisi urea menjadi amonium dan amonium menjadi nitrit dan nitrat yang diuji mengikuti laju kinetika reaksi orde 1 (satu) terhadap urea dan orde satu terhadap amonium dengan konstanta laju reaksi masing-masing k1 = 0,019 dan k2 = 0,022 min-1.

Perbandingan Kadar IL-5 dan Jumlah Eosinofil Antara Anak dan Orang Dewasa yang Terinfeksi Ascaris Lumbricoides

Jurnal Kesehatan Andalas Vol 4, No 3 (2015)
Publisher : Fakultas Kedokteran Universitas Andalas

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Abstract

Abstrak Ascaris lumbricoides pada umumnya menginfeksi anak, tetapi juga dapat terjadi pada orang dewasa. Respon imun hospes terhadap infeksi cacing dimulai dengan teraktifasinya Th2 dengan peningkatan yang signifikan dari IL-4, IL-5, IL-9, IL-10 dan IL-13. IL-5 yang terbentuk merangsang perkembangan dan aktivasi eosinofil. Tujuan penelitian ini adalah mengetahui perbandingan kadar IL-5 dan jumlah eosinofil antara anak dan orang dewasa yang terinfeksi oleh Ascaris lumbricoides. Telah dilakukan penelitian secara cross sectional terhadap 16 orang anak dan 16 orang dewasa yang terinfeksi Ascaris lumbricoides. Spesimen darah dan serum anak dan orang dewasa diperiksa IL-5 metode ELISA dan jumlah eosinofil metode mikroskopis. Data dianalisis dengan uji t independent dengan hasil statistik bermakna bila p<0,05. Didapatkan rerata kadar IL-5 anak 5,90±3,61 pg/ml dan 4,10±1,98 pg/ml rerata kadar IL-5 pada orang dewasa dengan nilai p=0,092 (p>0,05), sedangkan rerata jumlah eosinofil anak 14,56±7,77% dan 8,81±4,65% rerata jumlah eosinofil orang dewasa dengan nilai p=0,018 (p<0,05). Kadar IL-5 tidak berbeda signifikan antara anak dan orang dewasa, sebaliknya jumlah eosinofil terdapat perbedaan yang signifikan antara anak dan orang dewasa. Kesimpulan hasil penelitian ini ialah jumlah eosinofil anak lebih tinggi dari pada jumlah eosinofil orang dewasa yang terinfeksi Ascaris lumbricoides. Kata kunci: IL-5, jumlah eosinofil, anak, orang dewasa, infeksi Ascaris lumbricoides Abstract The infection of Ascaris lumbricides common infect children, but it also can be occurred to adult. The immune’s host respond to the worm infection begin from the activation of Th2 by the significant increasing from IL-4, IL-5, IL-9 and IL-13. IL-5 which formed stimulate the development and eosinofil’s activation. The objective of this study was to know the comparison IL-5 degree with the total of eosinofil between the child and adult who is infected by Ascaris lumbricides. The research has been done based on the cross sectional to the 16 chidlren ascarisis and 16 adultascarisis. The ascarisis’ sample serum and blood of the child and adult have taken to check IL-5 by ELISA method and the total eosinofil by mikroskopis method. The data was analyzed by t independent test, and the statistic’s result has meaning if can be reached p<0 05. The result’s f inding is the average degree of IL-5 to the child is 5.90±3,61 pg/mL and for adult is 4.10±1.98 pg/mL, with the p score is 0.092 (p>0.05) mean while the total of eosinofil in child is 14. 56±7.77% and for adult is 8.81± 4.65% mean while the total of eosinofil for adult with the p score is 0.018 (p<0.05). Based on the checked IL-5 degree is not available the differences between child and adult. On the contrary based on the totalof eosinofil is available the differences is meaningful between child and adult. It can be concluded that there are the total increasing eosinofil to the child who infected Ascaris lumbricides than in the adult.  Keywords: IL-5, the total of eosinofil, child, adult, Ascaris infection

PROFIL BERPIKIR VISUAL MAHASISWA CALON GURU MATEMATIKA DALAM MEMAHAMI DEFINISI FORMAL BARISAN KONVERGEN BERDASARKAN PERBEDAAN GENDER

Jurnal Penelitian LPPM (Lembaga Penelitian dan Pengabdian kepada Masyarakat) IKIP PGRI MADIUN Vol 3, No 1 (2015)
Publisher : IKIP PGRI MADIUN

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Abstract

The aim of this study was to get profile of visual thinking of prospective teachers of mathematics in understanding formal definitions of convergent sequences based on gender differences. This study focused more on the process than the results. The results of the study are presented in the form of descriptions based on empirical data. Therefore, it used descriptive-exploratory study with a qualitative approach. To get the depth of the data, it selected one male subject and one female subject. Method of task-based interviews with semi-structured format was used to collect the data. The time triangulation is used to validate the data. Reduction, categorization, synthesis, and inferences are used to analyze the data. The results showed that: 1) The male student does four stages or activities to understand the formal definition of convergent sequences, that is: to recognize, to imagine, to show, and to conclude. The activity to show can be categorized into two sub-activities; namely: to show a picture of convergent sequences and to show a picture attribute of the definition. The sequence of activities to understand was carried out by the male student in not a linear fashion. Profile of visual thinking of male prospective teacher of mathematics in understanding formal definitions of convergent sequences is obtained from on the information processing activities that involve mental imagery. Mental imagery processing is done through three stages, namely: to construct mental imagery, to processing mental imagery, and to utilize mental imagery. The stages of processing mental imagery can be categorized into two sub-stages; namely: to determine mental imagery and to refine mental imagery. 2) The female student does four stages or activities to understand the formal definition of convergent sequences, namely: to recognize, to imagine, to show, and to conclude. The activity to show can be categorized into two sub-activities; namely: to show a picture of convergent sequence and to show a picture attribute of the definition. To understand the sequence of activities was performed by female student in a linear fashion. Profile of visual thinking of female prospective teacher of mathematics in understanding formal definitions of convergent sequences is obtained from the information processing activities that involve mental imagery. Mental imagery processing is done through three stages namely: to construct mental imagery, to processing mental imagery, and to utilize mental imagery. The stages of processing mental imagery can be categorized into two sub-stages; namely: to determine mental imagery and to refine mental imagery. 3) Regardless of the differences in the representation and processing sequence as well as the activities and the use of mental imagery, there are similarities in the understanding of the formal definition of convergent sequences. To understand the formal definition of convergent sequences, students do four phases of activities, namely: to recognize, to imagine, to show, and to conclude. The activity to show can be categorized into two sub-activities; namely: to show a picture of convergent sequences and to show a picture attribute of the definition. Mental imagery processing is done through three stages, namely: to construct mental imagery, to processing mental imagery, and to utilize mental imagery. Keywords: visual thinking, understanding, formal definition convergent sequences, prospective