zul kifli | Universitas Sari Mutiara Indonesia (original) (raw)
Papers by zul kifli
Penelitian ini dilakukan pada PT. Bio Nusantara Teknologi dan PT. Agri Andalas di Kabupaten Bengk... more Penelitian ini dilakukan pada PT. Bio Nusantara Teknologi dan PT. Agri Andalas di Kabupaten Bengkulu Utara. Kedua perusahaan tersebut dipilih untuk diteliti karena PT. Bio Nusantara Teknologi sebagai wakil dari perusahaan perkebunan yang besar dan PT. Agri Andalas sebagi wakil dari perusaan perkebunan yang kecil yang berada di Kabupaten Bengkulu Utara. Permasalahan yang diangkat adalah Produktivitas tenaga kerja buruh perkebunan sawit, hal ini disebabkan karena produktivitas tenaga kerja buruh perkebunan sawit sangat penting bagi perusahaan yang bersangkutan dalam usaha memenuhi kebutuhan bahan baku perusahaan. Produktivitas tenaga kerja buruh pada perusahaan perkebunan sawit di Kabupaten Bengkulu Utara masih rendah karena belum dicapinya standar produktivitas oleh buruh yang ditetapkan perusahaan. Hanya sebagian buruh yang mampu mencapai produktivitas lebih dari standar. Rendahnya produktivitas tenaga kerja buruh dipengaruhi oleh faktor umur, pengalaman, pendidikan dan insentif. Karena keempat variabel tersebut diduga sangat menentukan hasil produksi. Tujuan penelitian ini adalah untuk mengetahui pengaruh umur, pengalaman, pendidikan dan insentif terhadap produktipitas tenaga kerja buruh perkebunan sawit. Data yang digunakan adalah data primer, yang dikumpulkan melalui penyebaran kuesioner pada buruh PT. Bio Nusantara Teknologi dan PT. Agri Andalas, jumlah responden sebanyak 42 orang buruh pemetik buah sawit. Data yang dikumpulkan dan diolah dengan regresi linier berganda diketahui bahwa umur, pengalaman, pendidikan dan insentif berpengaruh positif secara signifikan terhadap produktivitas tenaga kerja buruh perkebunan sawit. Selain itu dengan metode wawancara diketahui bahwa faktor peralatan, cuaca, kondisi perkebunan, dan tingginya batang sawit juga mempengaruhi produktivitas tenaga kerja buruh perkebunan sawit di Kabupaten Bengkulu Utara.
FIKRUNA
abstrak sex education
The purpose of this study was to find solutions for problems related to the quality of accounting... more The purpose of this study was to find solutions for problems related to the quality of accounting information systems, accounting information quality when connected with management commitment, user competency and organizational culture. This research was conducted through deductive analysis supported the phenomenon then sought evidence through empirical facts, especially about the effect of management commitment, competence and users of organizational culture on the quality of accounting information systems and their impact on the quality of accounting information. This research was conducted at the State-Owned Enterprises (SOEs).
Physical Chemistry Chemical Physics, 2021
The diffusion coefficient of palladium varies with hydrogen content due to filling of antibonding... more The diffusion coefficient of palladium varies with hydrogen content due to filling of antibonding states and softening of lattice modes.
Journal of Guangxi University, 2001
With a particularlydesigned apparatus,the impact force was determined in cases of rigid impacting... more With a particularlydesigned apparatus,the impact force was determined in cases of rigid impacting and flexible impacting with rubber cushion.Models for calculating impact force were regressed.In case of rigid impacting, impact force is proportional to mass of impacting body,impacting kinetic energy and the square of impacting velocity,their relationships can be described as liner mathematic models, and steel cushion cannot buffer impact.In case of flexible impacting with rubber cushion, the buffering effect varies only with the thickness of rubber cushion ,which can be expressed as exponential equation.
title METHANE ATR IN A CATALYTIC MICROREACTOR AND INTEGRATION OF A SELF-SUPPORTED PD-MEMBRANE FOR... more title METHANE ATR IN A CATALYTIC MICROREACTOR AND INTEGRATION OF A SELF-SUPPORTED PD-MEMBRANE FOR HYDROGEN SEPARATION Author Dr. Marra , Lucia, TU/e, Eindhoven, Nederland (Presenting author) Co-author(s) Gallucci, F, TU/e, Eindhoven, Nederland Peters, T. A., SINTEF Materials and Chemistry, Oslo, Norway Stange, M, SINTEF Materials and Chemistry, Oslo, Norway Bredesen, R, SINTEF Materials and Chemistry, Oslo, Norway Sint Annaland, M van, TU/e, Eindhoven, Nederland Images View abstract data Background In these years the demand for small-scale pure hydrogen production is growing in many industrial applications. Many efforts are made to obtain compact, efficient and thermally-independent unit for autonomous generation of ultra-pure hydrogen from natural gas. Aims The work focuses on the design of an innovative reactor concept for ATR of methane, which allowed the integration hydrogen separation through selective membranes and effective heat exchange in a single module. We developed a nat...
Rausyan Fikr : Jurnal Pemikiran dan Pencerahan, 2019
Abstrak:Penelitian ini merupakan penelitian kepustakaan dan bersifat deskriptif analitik. Fokus p... more Abstrak:Penelitian ini merupakan penelitian kepustakaan dan bersifat deskriptif analitik. Fokus penelitian diarahkan untuk mengkaji Konsep Pendidikan Islam penelitian ini menyimpulkan bahwa: Pendidikan Islam adalah pendidikan yang memberikan kemampuan sseseorang untuk memimpin kehidupannya sesuai dengan cita-cita dan nilai-nilai Islam yang telah menjiwai dan mewarnai corak kepribadiannya. Kata Kunci: Pendidikan, Pengajaran dan Pembiasaan
Indonesia with raw material limestone abundant, light brick of Autoclaved Aerated Concrete (AAC) ... more Indonesia with raw material limestone abundant, light brick of Autoclaved Aerated Concrete (AAC) is the most important component in the construction of buildings, so that needs light brick AAC qualified in mechanical and thermal properties of acoustic. In the research domain lightweight brick lifting who qualified mechanical properties. Advantages of light brick AAC low density of about 500 to 650 kg/m3, more economical, suitable for multi-storey buildings can reduce the weight of 30 to 40 % compared with conventional brick (clay brick). One of the problems found in the fabrication of lightweight brick is how to determine the composition of raw materials used. The composition of materials in lightweight brick can affect its mechanical properties which are an important parameter for building materials. In this research the prediction of the effect of elements composition and density on compressive strength (AAC) using neural network has been done. Furthermore, the simulation on the e...
Daerah aliran sungai sempaja pada kota samarindaprovinsi kalimantan timur saat ini telah banyak m... more Daerah aliran sungai sempaja pada kota samarindaprovinsi kalimantan timur saat ini telah banyak mengalami perubahan tata guna lahan , baik itu di daerah hulu maupun di daerah hilir DAS. Perubahan yang cukup berarti ini mengakibatkan banjir baik itu daerah hulu maupun daerah hilir DAS.
Masalah yang dibahas pada penelitian ini adalah penggunaan transisi pada novel Bumi Cinta karya H... more Masalah yang dibahas pada penelitian ini adalah penggunaan transisi pada novel Bumi Cinta karya Habiburrahman El Shirazy dan implikasinya pada pembelajaran menulis di SMA. Penelitian ini bertujuan untuk mendeskripsikan penggunaan transisi pada novel Bumi Cinta karya Habiburrahman El Shirazy dan implikasinya pada pembelajaran menulis di SMA. Metode yang digunakan dalam penelitian ini ialah metode deskriptif kualitatif. Sumber data dalam penelitian ini adalah novel Bumi Cinta karya Habiburrahman El Shirazy. Teknik yang digunakan untuk memperoleh data pada penelitian ini adalah teknik dokumentasi. Berdasarkan hasil penelitian pada novel Bumi Cinta karya Habiburrahman El Shirazy, ditemukan penggunaan transisi yang berupa kata dan frasa. Transisi yang ditemukan terdiri atas kata dan frasa transisi yang berupa konjungsi dan bukan konjungsi. Kata dan frasa transisi yang ditemukan tergolong menjadi kata dan Zul Kifli frasa transisi yang berupa konjungsi intrakalimat dan konjungsi antarkalim...
Membranes, 2018
Dense metal membranes that are based on palladium (Pd) are promising for hydrogen separation and ... more Dense metal membranes that are based on palladium (Pd) are promising for hydrogen separation and production due to their high selectivity and permeability. Optimization of alloy composition has normally focused on bulk properties, but there is growing evidence that grain boundaries (GBs) play a crucial role in the overall performance of membranes. The present study provides parameters and analyses of GBs in the ternary Pd-Ag-Cu system, based on first-principles electronic structure calculations. The segregation tendency of Cu, Ag, and vacancies towards 12 different coherent ∑ GBs in Pd was quantified using three different procedures for relaxation of supercell lattice constants, representing the outer bounds of infinitely elastic and stiff lattice around the GBs. This demonstrated a clear linear correlation between the excess volume and the GB energy when volume relaxation was allowed for. The point defects were attracted by most of the GBs that were investigated. Realistic atomic-s...
Strength of Materials, 1975
Because welded joints are widely used it is essential to make a careful study of their fitness fo... more Because welded joints are widely used it is essential to make a careful study of their fitness for work and to establish well-founded criteria for calculating their carrying power. A new concept of fracture criteria for materials developed at the beginning of the fifties. In particular, Irwin [1] proposed a method, supplemented by Brown and Srawley [2], the essence of which was that the stress and the linear size of the crack should be determined at the so-called critical instant of loading, i.e., at the instant when the equilibrium between the energy of formation of the plastic zone and the new surfaces and the elastic energy which is released when the crack develops is disturbed.
Journal of Membrane Science, 2016
Abstract In the current article we present the long-term performance of 10 μm-thick Pd 77 Ag 23 m... more Abstract In the current article we present the long-term performance of 10 μm-thick Pd 77 Ag 23 membranes under the exposure to varying concentrations of H 2 S ranging from 5 ppb to 20 ppm at temperatures of 350 and 450 °C. Membranes are exposed to H 2 S during 265 hours followed by either a H 2 flux recovery study, or rapid quenching allowing for post-process characterisation. The results show that the magnitude of the H 2 flux inhibition is largely influenced by the H 2 S level. Up to 30% reduction in H 2 flux is seen during long-term exposure to 2 ppm of H 2 S at 450 °C, a level below the thermodynamic level for sulphide formation. After H 2 S removal, close to full H 2 flux recoveries are seen. At H 2 S levels above 5 ppm, the level where Pd 4 S formation is thermodynamically expected on pure Pd at 450 °C, the H 2 flux is largely inhibited, and sulphide formation is confirmed by XRD and XPS analysis of long-term exposed membrane films. In addition, we have experimentally evaluated the H 2 permeation and recovery under exposure to upset (10 minute) H 2 S concentrations between 2 and 20 ppm H 2 S at 450 °C. Short exposures (10-min) to H 2 S result as well in a large inhibition of the H 2 flux: e.g. a 10-min exposure to 20 ppm H 2 S inhibits the H 2 flux by more than 80%. Despite the large inhibition full H 2 flux recoveries are obtained, even for membrane films exposed to H 2 S concentrations above the thermodynamic limit for sulphide formation (5–20 ppm).
Chemischer Informationsdienst. Organische Chemie, 1970
Energy Procedia, 2017
Palladium (Pd) membranes are a promising enabling technology for power generation and hydrogen pr... more Palladium (Pd) membranes are a promising enabling technology for power generation and hydrogen production with CO 2 capture. SINTEF has developed and patented a flexible technology to produce Pd-alloy membranes that significantly improves flux and thereby reduces material costs. Reinertsen AS and SINTEF aim to demonstrate the Pd membrane technology for H 2 separation on a side stream of the Statoil Methanol Plant at Tjeldbergodden, Norway. In the present article, we present the upscaling of the membrane manufacturing process, together with the membrane module and skid design and construction.
The Problem discussed in this research is question discourse in discussion on character developme... more The Problem discussed in this research is question discourse in discussion on character development of Indonesan Subject (MPK) at Mathematics Department of FMIPA of Lampung University in academic year 2012/2013. This research is intended to describe question discourse in discussion on Indonesian MPK at Mathematics Department of FMIPA of Lampung University in academic year 2012/2013. The method that is used in this research is qualitative descriptive method. The subject in this research is 68 students majoring Mathematic of FMIPA of Lampung University on Indonesian MPK, academic year 2012/2013. The observational object in this reasearch is question discourse in discussion on Indonesian MPK at Mathematics Department in the academic year 2012/2013. Data collecting technique that is used in this research is recording technique or audiovisual, Technique of Simak Bebas Libat Cakap (SBLC), and field note. Collected data was analised by using of heuristic analysis. The result of the observation shows that question discourse found was in form of directive speech. Based on its communicative function, question discourse was found in form of; speech act of question , speech act of anger, speech act of ensuring, speech act of limiting, speech act of commanding , speech act of asking for, speech act of asking for reason, speech act of asking for permit, speech act of asking for explanation, speech act of asking for comment, speech act of allowing, speech act of questioning, speech act of adding, speech act of recalling, speech act of explaining, speech at of blaming, speech at of intimidating, speech act of Zul Kifli hesitating, speech act of revising, speech act of despising, and speech act of convincing. Based on its discourse directness, question discourse was found in form of direct speech acts on target and with argument , and indirect speech acts. Question discourse found in form of direct speech acts was one direct speech acts on objective and direct speech acts with argument. Question discourse found in form of direct speech acts with argument were divided into two; those that have argument in the beginning/its reason lies at startup and those that have argument in the end. Based on the conversation principles, question discourse was found in form of ; those that fulfill the collaboration principle and the politeness principle; those that fulfill the collaboration principle but don't fulfill the politeness principle; those that don’t fulfill the collaboration principle but fulfill the politeness principle; and those that don't fulfill both the collaboration principle and politeness principle.
Journal of Membrane Science, 2016
Ceramic-ceramic composite (cercer) membranes of (Mo-doped) lanthanum tungstate, La27(W,Mo)5O55.5-... more Ceramic-ceramic composite (cercer) membranes of (Mo-doped) lanthanum tungstate, La27(W,Mo)5O55.5-δ, and lanthanum chromite, La0.87Sr0.13CrO3-δ, have recently been shown to exhibit H2 permeabilities among state-of-the-art. The present work deals with the long-term stability of these cercer membranes in line with concern of flux degradation and phase instability observed in previous studies. The H2 permeability of disc shaped membranes with varying La/W ratio in the lanthanum tungstate phase (5.35≤La/W≤5.50) was measured at 900 and 1000 °C with a feed gas containing 49% H2 and 2.5% H2O for up to 1500 hours. It was observed that the H2 permeability decreased by a factor of up to 5.3 over 1500 hours at 1000 °C. Post-characterization of the membranes and similarly annealed samples was performed by SEM, STEM and XRD, and segregation of La2O3 was observed. The decrease in H2 permeability was ascribed to the compositional instability of the cation-disordered lanthanum tungstate under the measurement conditions. Equilibration of the La/W ratio by segregation of La2O3 leads to a lower ionic conductivity according to the materials inherent defect chemistry. Partial decomposition and reduction of the lanthanum tungstate phase, presumably to metallic tungsten, was also observed after exposure to nominally dry hydrogen.
Penelitian ini dilakukan pada PT. Bio Nusantara Teknologi dan PT. Agri Andalas di Kabupaten Bengk... more Penelitian ini dilakukan pada PT. Bio Nusantara Teknologi dan PT. Agri Andalas di Kabupaten Bengkulu Utara. Kedua perusahaan tersebut dipilih untuk diteliti karena PT. Bio Nusantara Teknologi sebagai wakil dari perusahaan perkebunan yang besar dan PT. Agri Andalas sebagi wakil dari perusaan perkebunan yang kecil yang berada di Kabupaten Bengkulu Utara. Permasalahan yang diangkat adalah Produktivitas tenaga kerja buruh perkebunan sawit, hal ini disebabkan karena produktivitas tenaga kerja buruh perkebunan sawit sangat penting bagi perusahaan yang bersangkutan dalam usaha memenuhi kebutuhan bahan baku perusahaan. Produktivitas tenaga kerja buruh pada perusahaan perkebunan sawit di Kabupaten Bengkulu Utara masih rendah karena belum dicapinya standar produktivitas oleh buruh yang ditetapkan perusahaan. Hanya sebagian buruh yang mampu mencapai produktivitas lebih dari standar. Rendahnya produktivitas tenaga kerja buruh dipengaruhi oleh faktor umur, pengalaman, pendidikan dan insentif. Karena keempat variabel tersebut diduga sangat menentukan hasil produksi. Tujuan penelitian ini adalah untuk mengetahui pengaruh umur, pengalaman, pendidikan dan insentif terhadap produktipitas tenaga kerja buruh perkebunan sawit. Data yang digunakan adalah data primer, yang dikumpulkan melalui penyebaran kuesioner pada buruh PT. Bio Nusantara Teknologi dan PT. Agri Andalas, jumlah responden sebanyak 42 orang buruh pemetik buah sawit. Data yang dikumpulkan dan diolah dengan regresi linier berganda diketahui bahwa umur, pengalaman, pendidikan dan insentif berpengaruh positif secara signifikan terhadap produktivitas tenaga kerja buruh perkebunan sawit. Selain itu dengan metode wawancara diketahui bahwa faktor peralatan, cuaca, kondisi perkebunan, dan tingginya batang sawit juga mempengaruhi produktivitas tenaga kerja buruh perkebunan sawit di Kabupaten Bengkulu Utara.
FIKRUNA
abstrak sex education
The purpose of this study was to find solutions for problems related to the quality of accounting... more The purpose of this study was to find solutions for problems related to the quality of accounting information systems, accounting information quality when connected with management commitment, user competency and organizational culture. This research was conducted through deductive analysis supported the phenomenon then sought evidence through empirical facts, especially about the effect of management commitment, competence and users of organizational culture on the quality of accounting information systems and their impact on the quality of accounting information. This research was conducted at the State-Owned Enterprises (SOEs).
Physical Chemistry Chemical Physics, 2021
The diffusion coefficient of palladium varies with hydrogen content due to filling of antibonding... more The diffusion coefficient of palladium varies with hydrogen content due to filling of antibonding states and softening of lattice modes.
Journal of Guangxi University, 2001
With a particularlydesigned apparatus,the impact force was determined in cases of rigid impacting... more With a particularlydesigned apparatus,the impact force was determined in cases of rigid impacting and flexible impacting with rubber cushion.Models for calculating impact force were regressed.In case of rigid impacting, impact force is proportional to mass of impacting body,impacting kinetic energy and the square of impacting velocity,their relationships can be described as liner mathematic models, and steel cushion cannot buffer impact.In case of flexible impacting with rubber cushion, the buffering effect varies only with the thickness of rubber cushion ,which can be expressed as exponential equation.
title METHANE ATR IN A CATALYTIC MICROREACTOR AND INTEGRATION OF A SELF-SUPPORTED PD-MEMBRANE FOR... more title METHANE ATR IN A CATALYTIC MICROREACTOR AND INTEGRATION OF A SELF-SUPPORTED PD-MEMBRANE FOR HYDROGEN SEPARATION Author Dr. Marra , Lucia, TU/e, Eindhoven, Nederland (Presenting author) Co-author(s) Gallucci, F, TU/e, Eindhoven, Nederland Peters, T. A., SINTEF Materials and Chemistry, Oslo, Norway Stange, M, SINTEF Materials and Chemistry, Oslo, Norway Bredesen, R, SINTEF Materials and Chemistry, Oslo, Norway Sint Annaland, M van, TU/e, Eindhoven, Nederland Images View abstract data Background In these years the demand for small-scale pure hydrogen production is growing in many industrial applications. Many efforts are made to obtain compact, efficient and thermally-independent unit for autonomous generation of ultra-pure hydrogen from natural gas. Aims The work focuses on the design of an innovative reactor concept for ATR of methane, which allowed the integration hydrogen separation through selective membranes and effective heat exchange in a single module. We developed a nat...
Rausyan Fikr : Jurnal Pemikiran dan Pencerahan, 2019
Abstrak:Penelitian ini merupakan penelitian kepustakaan dan bersifat deskriptif analitik. Fokus p... more Abstrak:Penelitian ini merupakan penelitian kepustakaan dan bersifat deskriptif analitik. Fokus penelitian diarahkan untuk mengkaji Konsep Pendidikan Islam penelitian ini menyimpulkan bahwa: Pendidikan Islam adalah pendidikan yang memberikan kemampuan sseseorang untuk memimpin kehidupannya sesuai dengan cita-cita dan nilai-nilai Islam yang telah menjiwai dan mewarnai corak kepribadiannya. Kata Kunci: Pendidikan, Pengajaran dan Pembiasaan
Indonesia with raw material limestone abundant, light brick of Autoclaved Aerated Concrete (AAC) ... more Indonesia with raw material limestone abundant, light brick of Autoclaved Aerated Concrete (AAC) is the most important component in the construction of buildings, so that needs light brick AAC qualified in mechanical and thermal properties of acoustic. In the research domain lightweight brick lifting who qualified mechanical properties. Advantages of light brick AAC low density of about 500 to 650 kg/m3, more economical, suitable for multi-storey buildings can reduce the weight of 30 to 40 % compared with conventional brick (clay brick). One of the problems found in the fabrication of lightweight brick is how to determine the composition of raw materials used. The composition of materials in lightweight brick can affect its mechanical properties which are an important parameter for building materials. In this research the prediction of the effect of elements composition and density on compressive strength (AAC) using neural network has been done. Furthermore, the simulation on the e...
Daerah aliran sungai sempaja pada kota samarindaprovinsi kalimantan timur saat ini telah banyak m... more Daerah aliran sungai sempaja pada kota samarindaprovinsi kalimantan timur saat ini telah banyak mengalami perubahan tata guna lahan , baik itu di daerah hulu maupun di daerah hilir DAS. Perubahan yang cukup berarti ini mengakibatkan banjir baik itu daerah hulu maupun daerah hilir DAS.
Masalah yang dibahas pada penelitian ini adalah penggunaan transisi pada novel Bumi Cinta karya H... more Masalah yang dibahas pada penelitian ini adalah penggunaan transisi pada novel Bumi Cinta karya Habiburrahman El Shirazy dan implikasinya pada pembelajaran menulis di SMA. Penelitian ini bertujuan untuk mendeskripsikan penggunaan transisi pada novel Bumi Cinta karya Habiburrahman El Shirazy dan implikasinya pada pembelajaran menulis di SMA. Metode yang digunakan dalam penelitian ini ialah metode deskriptif kualitatif. Sumber data dalam penelitian ini adalah novel Bumi Cinta karya Habiburrahman El Shirazy. Teknik yang digunakan untuk memperoleh data pada penelitian ini adalah teknik dokumentasi. Berdasarkan hasil penelitian pada novel Bumi Cinta karya Habiburrahman El Shirazy, ditemukan penggunaan transisi yang berupa kata dan frasa. Transisi yang ditemukan terdiri atas kata dan frasa transisi yang berupa konjungsi dan bukan konjungsi. Kata dan frasa transisi yang ditemukan tergolong menjadi kata dan Zul Kifli frasa transisi yang berupa konjungsi intrakalimat dan konjungsi antarkalim...
Membranes, 2018
Dense metal membranes that are based on palladium (Pd) are promising for hydrogen separation and ... more Dense metal membranes that are based on palladium (Pd) are promising for hydrogen separation and production due to their high selectivity and permeability. Optimization of alloy composition has normally focused on bulk properties, but there is growing evidence that grain boundaries (GBs) play a crucial role in the overall performance of membranes. The present study provides parameters and analyses of GBs in the ternary Pd-Ag-Cu system, based on first-principles electronic structure calculations. The segregation tendency of Cu, Ag, and vacancies towards 12 different coherent ∑ GBs in Pd was quantified using three different procedures for relaxation of supercell lattice constants, representing the outer bounds of infinitely elastic and stiff lattice around the GBs. This demonstrated a clear linear correlation between the excess volume and the GB energy when volume relaxation was allowed for. The point defects were attracted by most of the GBs that were investigated. Realistic atomic-s...
Strength of Materials, 1975
Because welded joints are widely used it is essential to make a careful study of their fitness fo... more Because welded joints are widely used it is essential to make a careful study of their fitness for work and to establish well-founded criteria for calculating their carrying power. A new concept of fracture criteria for materials developed at the beginning of the fifties. In particular, Irwin [1] proposed a method, supplemented by Brown and Srawley [2], the essence of which was that the stress and the linear size of the crack should be determined at the so-called critical instant of loading, i.e., at the instant when the equilibrium between the energy of formation of the plastic zone and the new surfaces and the elastic energy which is released when the crack develops is disturbed.
Journal of Membrane Science, 2016
Abstract In the current article we present the long-term performance of 10 μm-thick Pd 77 Ag 23 m... more Abstract In the current article we present the long-term performance of 10 μm-thick Pd 77 Ag 23 membranes under the exposure to varying concentrations of H 2 S ranging from 5 ppb to 20 ppm at temperatures of 350 and 450 °C. Membranes are exposed to H 2 S during 265 hours followed by either a H 2 flux recovery study, or rapid quenching allowing for post-process characterisation. The results show that the magnitude of the H 2 flux inhibition is largely influenced by the H 2 S level. Up to 30% reduction in H 2 flux is seen during long-term exposure to 2 ppm of H 2 S at 450 °C, a level below the thermodynamic level for sulphide formation. After H 2 S removal, close to full H 2 flux recoveries are seen. At H 2 S levels above 5 ppm, the level where Pd 4 S formation is thermodynamically expected on pure Pd at 450 °C, the H 2 flux is largely inhibited, and sulphide formation is confirmed by XRD and XPS analysis of long-term exposed membrane films. In addition, we have experimentally evaluated the H 2 permeation and recovery under exposure to upset (10 minute) H 2 S concentrations between 2 and 20 ppm H 2 S at 450 °C. Short exposures (10-min) to H 2 S result as well in a large inhibition of the H 2 flux: e.g. a 10-min exposure to 20 ppm H 2 S inhibits the H 2 flux by more than 80%. Despite the large inhibition full H 2 flux recoveries are obtained, even for membrane films exposed to H 2 S concentrations above the thermodynamic limit for sulphide formation (5–20 ppm).
Chemischer Informationsdienst. Organische Chemie, 1970
Energy Procedia, 2017
Palladium (Pd) membranes are a promising enabling technology for power generation and hydrogen pr... more Palladium (Pd) membranes are a promising enabling technology for power generation and hydrogen production with CO 2 capture. SINTEF has developed and patented a flexible technology to produce Pd-alloy membranes that significantly improves flux and thereby reduces material costs. Reinertsen AS and SINTEF aim to demonstrate the Pd membrane technology for H 2 separation on a side stream of the Statoil Methanol Plant at Tjeldbergodden, Norway. In the present article, we present the upscaling of the membrane manufacturing process, together with the membrane module and skid design and construction.
The Problem discussed in this research is question discourse in discussion on character developme... more The Problem discussed in this research is question discourse in discussion on character development of Indonesan Subject (MPK) at Mathematics Department of FMIPA of Lampung University in academic year 2012/2013. This research is intended to describe question discourse in discussion on Indonesian MPK at Mathematics Department of FMIPA of Lampung University in academic year 2012/2013. The method that is used in this research is qualitative descriptive method. The subject in this research is 68 students majoring Mathematic of FMIPA of Lampung University on Indonesian MPK, academic year 2012/2013. The observational object in this reasearch is question discourse in discussion on Indonesian MPK at Mathematics Department in the academic year 2012/2013. Data collecting technique that is used in this research is recording technique or audiovisual, Technique of Simak Bebas Libat Cakap (SBLC), and field note. Collected data was analised by using of heuristic analysis. The result of the observation shows that question discourse found was in form of directive speech. Based on its communicative function, question discourse was found in form of; speech act of question , speech act of anger, speech act of ensuring, speech act of limiting, speech act of commanding , speech act of asking for, speech act of asking for reason, speech act of asking for permit, speech act of asking for explanation, speech act of asking for comment, speech act of allowing, speech act of questioning, speech act of adding, speech act of recalling, speech act of explaining, speech at of blaming, speech at of intimidating, speech act of Zul Kifli hesitating, speech act of revising, speech act of despising, and speech act of convincing. Based on its discourse directness, question discourse was found in form of direct speech acts on target and with argument , and indirect speech acts. Question discourse found in form of direct speech acts was one direct speech acts on objective and direct speech acts with argument. Question discourse found in form of direct speech acts with argument were divided into two; those that have argument in the beginning/its reason lies at startup and those that have argument in the end. Based on the conversation principles, question discourse was found in form of ; those that fulfill the collaboration principle and the politeness principle; those that fulfill the collaboration principle but don't fulfill the politeness principle; those that don’t fulfill the collaboration principle but fulfill the politeness principle; and those that don't fulfill both the collaboration principle and politeness principle.
Journal of Membrane Science, 2016
Ceramic-ceramic composite (cercer) membranes of (Mo-doped) lanthanum tungstate, La27(W,Mo)5O55.5-... more Ceramic-ceramic composite (cercer) membranes of (Mo-doped) lanthanum tungstate, La27(W,Mo)5O55.5-δ, and lanthanum chromite, La0.87Sr0.13CrO3-δ, have recently been shown to exhibit H2 permeabilities among state-of-the-art. The present work deals with the long-term stability of these cercer membranes in line with concern of flux degradation and phase instability observed in previous studies. The H2 permeability of disc shaped membranes with varying La/W ratio in the lanthanum tungstate phase (5.35≤La/W≤5.50) was measured at 900 and 1000 °C with a feed gas containing 49% H2 and 2.5% H2O for up to 1500 hours. It was observed that the H2 permeability decreased by a factor of up to 5.3 over 1500 hours at 1000 °C. Post-characterization of the membranes and similarly annealed samples was performed by SEM, STEM and XRD, and segregation of La2O3 was observed. The decrease in H2 permeability was ascribed to the compositional instability of the cation-disordered lanthanum tungstate under the measurement conditions. Equilibration of the La/W ratio by segregation of La2O3 leads to a lower ionic conductivity according to the materials inherent defect chemistry. Partial decomposition and reduction of the lanthanum tungstate phase, presumably to metallic tungsten, was also observed after exposure to nominally dry hydrogen.