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Effect of bean maturity and roasting temperature on chemical content of robusta coffee

IOP Conference Series: Materials Science and engineering 2020年第2期830卷

作者： N L E Wahyuni R Rispiandi T Hariyadi Chemical Engineering Department Politeknik Negeri Bandung Jl. GegerkalongHilir Ds. Ciwaruga Bandung 40559 Indonesia Doctoral Program in Agricultural Sciences Faculty of Agriculture Padjadjaran University Jl Bandung-Sumedang KM 21 Bandung Indonesia

This study aims to determine the effect of roasting temperature on chemical content of coffee beans at various fruit maturity. Robusta coffee was obtained from Karawang Regency, West Java. After picking, sortation, and drying in the sun to 10% moisture content, the coffee beans were roasted at 190°C, 200°C, 210°C for 12 minutes. Physical properties observed were weight loss during the roasting. The chemical content observed were water, caffeine, fat, chlorogenic acid and ash before and after roasting. Chemical content analysis was performed using gravimetric methods, soxhlet extraction, and UV-Vis spectrophotometry. The color, aroma and flavor of roasted bean were conducted by organoleptic test. The results obtained, the ripe coffee bean with roasting temperature of 210°C is the best, which gives the lowest yield. The unripe green beans have the highest water content. The roasting temperature did not provide a significant difference in fat, caffeine, chlorogenic acid, and ash content. Organoleptic test results (color and aroma) showed that the mature beans with roasting temperature of 200-210°C were the most preferred, while the coffee brew most preferred was overripe bean with the roasting temperature of 200°C.

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Unit processes identification of maintenance on rigid and flexible pavement of local road

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IOP Conference Series: Materials Science and engineering 2019年第1期615卷

作者： F S Handayani F P Pramesti A Setyawan Doctoral Program in Civil Engineering Faculty of Engineering Sebelas Maret University Surakarta Indonesia Civil Engineering Department Faculty of Engineering Sebelas Maret University Surakarta Indonesia

Maintenance and rehabilitation as parts of pavement's life cycle become more important since it's an effort to restore the road condition as planned. This process will produce the emission of greenhouse gases that give an impact to the environment. The Live Cycle Assessment (LCA) was used to estimate the GHG's emissions. With LCA we could identify the unit process that will produce the GHG's emissions during maintenance and rehabilitation of road pavement. This research aimed to identify the unit processes of the maintenance and rehabilitation of rigid and flexible pavement and to analyse the amount of GHG emitted during this process. Four local roads in Indonesia were investigated as case studies. The result indicated the amount of energy of the unit processes as well as the GHG amount. This will lead to the identification of the hotspot of flexible and rigid pavement maintenance process. In rigid pavement maintenance activities, the hotspots included the asphalt transport process to asphalt mixing plant, cement transportation to the batching plant, and cement processing. Meanwhile, in flexible pavement maintenance activities, the hotspots were the asphalt transportation to asphalt mixing plant, transportation aggregate, and transportation to site.

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Thermoelectric Properties of Misfit Layered Bismuth-Based Rhodium Oxides, (Bi,Pb)2Sr2Rh2Oy

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Journal of Materials Science and Chemical engineering 2018年第7期6卷 97-103页

作者： Takuya Watanabe Hiroshi Irie Special Doctoral Program for Green Energy Conversion Science and Technology Interdisciplinary Graduate School of Medicine and Engineering University of Yamanashi Yamanashi Japan Clean Energy Research Center University of Yamanashi Yamanashi Japan

Rhodium oxides, including a misfitlayered structure with alternate stacking of a rock salttype layer and a hexagonal RhO2 layer, are expected to have good thermoelectric properties. Among them, the thermoelectric properties (electrical conductivity (σ), Seebeck coefficient (S), Figure of merit (ZT) and calculated thermal conductivity (κ) by S, σ, ZT, and absolute temperature (T)) of bismuth-based rhodium oxides ((Bi1-x,Pbx) 2Sr2Rh2Oy, x = 0 and 0.02, hereafter BSR and BPSR, respectively) were investigated. In comparison with Bi2Sr2Co2Oy (BSC) at 700°C, S and κ enhanced (increased S, 110 (BSR) and 105 μV K-1 (BPSR) from 85 μV K-1 (BSC) and decreased κ, 0.32 (BSR) and 0.50 W m-1 K-1 (BPSR) from 1.75 W m-1 K-1 (BSC)), whereas σ decreased (15 (BSR) and 31 S cm-1 (BPSR) from 70 S cm-1 (BSC)). BPSR reached the highest ZT value of 0.067 at 700°C, compared to those of 0.056 (BSR) and 0.027 (BSC).

关键词： Electroceramics Layered Rhodium Oxide Misfit Layer Structure Thermoe-lectric Material Harman Method

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Human Papillomavirus Infection Increases Risk of New-Onset Prurigo Nodularis: A Multi-Center Retrospective Cohort Study Using Global and US Electronic Medical Records of TriNetX network

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Journal of the American Academy of Dermatology 2025年

作者： Shuo-Yan Gau Shao-Wei Lo Yung-Fang Tu Wen-Chieh Liao Yu-Jung Su Hui-Chin Chang Torsten Zuberbier Martin Metz Shiu-Jau Chen Department and Graduate Institute of Business Administration National Taiwan University Taipei Taiwan Evidence-based Medicine Center Chung Shan Medical University Hospital Taichung Taiwan Department of Pharmacology Chung Shan Medical University Taichung Taiwan. Electronic address: sixsamurai.shien15@***. Harvard T.H. Chan School of Public Health Boston Massachusetts USA. Department of Biostatistics Harvard T.H. Chan School of Public Health Boston Massachusetts USA. Department of Post-Baccalaureate Medicine College of Medicine National Chung Hsing University Taichung Taiwan Doctoral Program in Tissue Engineering and Regenerative Medicine College of Medicine Taichung Taiwan. Orthopedics Department Chi-Mei Medical Center Tainan Taiwan. School of Medicine Chung Shan Medical University Taichung Taiwan Library Chung Shan Medical University Hospital Taichung Taiwan. Electronic address: sixsamurai.shien15@***. Institute of Allergology Charité-Universitätsmedizin Berlin Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin Berlin Germany Fraunhofer Institute for Translational Medicine and Pharmacology Immunology and Allergology Berlin Germany. Department of Neurosurgery Mackay Memorial Hospital Taipei Taiwan Department of Medicine Mackay Medical College New Taipei City Taiwan.

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Biogasoline production via catalytic cracking process using zeolite and zeolite catalyst modified with metals: a review

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IOP Conference Series: Materials Science and engineering 2020年第1期801卷

作者： Nina Haryani H. Harahap Taslim Irvan Doctoral Program Universitas Sumatera Utara dr. Mansur street USU Campus Medan 20155 Chemical Engineering Department Faculty of Engineering University of Sriwijaya Raya Palembang Prabumulih street Indralaya (OI) 30662 Sumatera Selatan Chemical Engineering Department Faculty of Engineering Universitas Sumatera Utara dr. Mansur street USU Campus Medan 20155

Biogasoline as an alternative fuel from vegetable oil is increasingly being studied by universities, research institutions, governments and others. The fact that the low yield of biogasoline is produced, the length of reaction time, how much energy is needed during the reaction, the high reaction temperature and expensive operating costs is a challenge in the scientific world to improve and develop further research. An appropriate process technology is needed in order to produce biogasoline fuel which is equivalent to the results of petroleum fractionation. Catalytic cracking process is one of the processes that are widely studied to produce biogasoline. Along with the development of biogasoline production, the use of catalysts in the cracking process has become increasingly diverse. It is in this paper that various biogasoline production with cracking processes using catalysts focused on zeolite and zeolite catalysts modified with metals will be reviewed, including an overview of cracking raw materials, types and characteristics of zeolite catalysts, operating conditions, and how the performance of each catalyst. Zeolite catalyst which is a heterogeneous catalyst is considered to have a good ability in selectivity, activity, and ease of modification so it is very influential on cracking results. Some zeolite catalysts modified with metals such as Zn/Zeolite, Au/HZSM-5, Ni-Mo/zeolite, Pd/HZSM-5, Pt/HZSM-5 are reported to be able to provide good performance to increase biogasoline yield and certainly become a useful new catalyst in the scientific world.

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Transcription control engineering and applications in synthetic biology

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Synthetic and Systems Biotechnology 2017年第3期2卷 176-191页

作者： Michael D.Engstrom Brian F.Pfleger Genetics-Biotechnology Center University of Wisconsin-Madison School of Medicine and Public HealthUSA Department of Chemical and Biological Engineering University of Wisconsin-Madison College of EngineeringUSA Microbiology Doctoral Training Program University of Wisconsin-MadisonUSA

In synthetic biology,researchers assemble biological components in new ways to produce systems with practical *** of these practical applications is control of the flow of genetic information(from nucleic acid to protein),*** *** is critical for optimizing protein(and therefore activity)levels and the subsequent levels of metabolites and other cellular *** central dogma of molecular biology posits that information flow commences with transcription,and accordingly,regulatory tools targeting transcription have received the most attention in synthetic *** this mini-review,we highlight many past successes and summarize the lessons learned in developing tools for controlling *** particular,we focus on engineering studies where promoters and transcription terminators(cis-factors)were directly engineered and/or isolated from DNA *** also review several well-characterized transcription regulators(trans-factors),giving examples of how cis-and trans-acting factors have been combined to create digital and analogue switches for regulating transcription in response to various ***,we provide examples of how engineered transcription control systems have been used in metabolic engineering and more complicated genetic *** most of our mini-review focuses on the well-characterized bacterium Escherichia coli,we also provide several examples of the use of transcription control engineering in non-model *** approaches have been applied outside the bacterial kingdom indicating that the lessons learned from bacterial studies may be generalized for other organisms.

关键词： Promoter Transcription Synthetic biology Bacteria Termination Metabolic engineering

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Correction to: Use of meat resources in the Early Pleistocene assemblages from Fuente Nueva 3 (Orce, Granada, Spain)

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Archaeological and Anthropological Sciences 2022年第5期14卷 1-1页

作者： Yravedra, José Solano, José Antonio Courtenay, Lloyd A. Saarinen, Juha Linares‑Matás, Gonzalo Luzón, Carmen Serrano‑Ramos, Alexia Herranz‑Rodrigo, Darío Cámara, José Miguel Ruiz, Auxiliadora Titton, Stefania Rodríguez‑Alba, Juan José Mielgo, Clara Blain, Hugues‑Alexandre Agustí, Jordi Sánchez‑Bandera, Christian Montilla, Eva Toro‑Moyano, Isidro Fortelius, Mikael Oms, Oriol Barsky, Deborah Jiménez‑Arenas, Juan Manuel Department of Prehistory Ancient History and Archaeology Complutense University of Madrid Madrid Spain C.A.I. Archaeometry and Archaeological Analysis Complutense University Madrid Spain Department of Prehistory and Archaeology University of Sevilla Seville Spain Department of Cartographic and Land Engineering Higher Polytechnic School of Avila University of Salamanca Avila Spain Department of Geosciences and Geography University of Helsinki Helsinki Finland School of Archaeology St. Hugh’s College University of Oxford Oxford UK History and Arts Doctoral Program University of Granada Granada Spain GEOREC Master Program University of Granada Granada Spain Department d’Historia i Historia de l’Art Universitat Rovira I Virgili (URV) Tarragona Spain Institut Català de Paleoecologia Humana I Evolució Social Tarragona Spain Institució Catalana de Recerca I Estudis Avançats (ICREA) Barcelona Spain Museum of the First Settlers of Europe “Josep Gibert” Granada Spain Archaeological and Ethnological Museum of Granada Granada Spain Department of Geology Unitat d’Estratigrafia University of Barcelona Barcelona Spain Department of Prehistory and Archaeology University of Granada Granada Spain Institute of Peace and Conflict Research University of Granada Granada Spain

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Conversion of rubber seed oil into biodiesel with potassium oxide alumina supported by (K2O/Al2O3) catalyst

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IOP Conference Series: Materials Science and engineering 2020年第1期980卷

作者： J A Karo Karo H Husin F Nasution F T Yani S Maliki D D Prayuda F Hasfita Baristan Industri Medan Badan Penelitian dan Pengembangan Industri Kementerian Perindustrian Medan Indonesia Doctoral Program School of Engineering Universitas Syiah Kuala Banda Aceh Indonesia 23111 Reaction Engineering and Catalysis Laboratory Department of Chemical Engineering Universitas Syiah Kuala Banda Aceh Indonesia 23111 Department of Chemical Engineering Malikussaleh University Lhoekseumawe 24300 Aceh Utara Indonesia

In this paper, we report the synthesis of K2O/Al2O3 for its application as a catalyst in the transesterification reaction for biodiesel production from rubber seed oil. So far, biodiesel production has been done through transesterification of vegetable oils through homogeneous catalysts, such as NaOH and KOH. Heterogeneous catalysts are more advantageous because they are easy to separate from the products, have less corrosion, and can be reused. This study aims to investigate the effectiveness of potassium oxide alumina-supported (K2O/Al2O3) solid catalysts to convert rubber seed oil into biodiesel. The K2O/Al2O3 catalyst was synthesized by impregnating KOH on the support of Al2O3 through the inception wetness method. The catalysts were characterized by scanning electron microscopy with energy-dispersive X-ray spectroscopy (SEM/EDX) to detect surface structure, composition, and active phase of the catalyst. EDX analysis indicated that the catalyst consisted of 36.41% potassium, 32.89%, and 30.7% oxygen. The reaction was conducted in a two-neck glass reactor at a temperature of 65°C, methanol to oil ratios of 10:1, during 1.5 h. The yield of biodiesel was achieved up to 96.9% at the ratio KOH: Al2O3 of 7.5: 2.5.

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Estimation of Received Signal Power for 5G-Railway Communication Systems

Estimation of Received Signal Power for 5G-Railway Communica...

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International Conference on Electric Vehicular Technology (ICEVT)

作者： Selvi Lukman Yul Yunazwin Nazaruddin Bo Ai Ruisi He Endra Joelianto Doctoral Program of Engineering Physics Faculty of Industrial Technology Institut Teknologi Bandung Bandung Indonesia Instrumentation and Control Research Group Institut Teknologi Bandung. National Center for Sustainable Transportation Technology Bandung Indonesia State Key Laboratory of Rail Traffic Control and Safety Beijing Jiaotong University Beijing P. R. China

The following topics are dealt with: battery powered vehicles; finite element analysis; lithium compounds; secondary cells; electric vehicles; hybrid electric vehicles; battery management systems; automobiles; electro... 详细信息

关键词： Support vector machines Estimation Machine learning Training Propagation losses Kernel Principal component analysis

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Genome sequence and analysis of Escherichia coli production strain LS5218

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Metabolic engineering Communications 2017年 5卷 78-83页

作者： Rand, Jacqueline M. Gordon, Gina C. Mehrer, Christopher R. Pfleger, Brian F. Department of Chemical and Biological Engineering University of Wisconsin Madison United States Microbiology Doctoral Training Program University of Wisconsin Madison United States

Escherichia coli strain LS5218 is a useful host for the production of fatty acid derived products, but the genetics underlying this utility have not been fully investigated. Here, we report the genome sequence of LS5218 and a list of large mutations and single nucleotide permutations (SNPs) relative to E. coli K-12 strain MG1655. We discuss how genetic differences may affect the physiological differences between LS5218 and MG1655. We find that LS5218 is more closely related to E. coli strain NCM3722 and suspect that small genetic differences between K-12 derived strains may have a significant impact on metabolic engineering efforts. © 2017

关键词： E. coli K-12 Genome sequence Metabolic engineering Polyhydroxyalkanoate

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