Humanity already possesses the fundamental scientific, technical, and industrial know-how to solve the carbon and climate problem for the next half-century. A portfolio of technologies now exists to meet the world's energy needs over the next 50 years and limit atmospheric CO2 to a trajectory that avoids a doubling of the preindustrial concentration. Every element in this portfolio has passed beyond the laboratory bench and demonstration project; many are already implemented somewhere at full industrial scale. Although no element is a credible candidate for doing the entire job (or even half the job) by itself, the portfolio as a whole is large enough that not every element has to be used.

“Stabilization wedges: Solving the climate problem for the next 50 years with current technologies” from science magazine (2004)

Recent progress of surface coating on cathode materials for high-performance lithium-ion batteries

Magnetorheological elastomers (MREs) are a class of recently emerged smart materials whose moduli are largely influenced when exposed to an external magnetic field. The MREs are particulate composites, where micro-sized magnetic particles are dispersed inside a non-magnetic polymeric matrix. These elastomers are known for changing their mechanical and rheological properties in the presence of a magnetic field. This change in properties is widely known as the magnetorheological (MR) effect. The MR effect depends on a number of factors such as type of matrix materials, type, concentration and distribution of magnetic particles, use of additives, working modes, and magnetic field strength. The investigation of MREs’ mechanical properties in both off-field and on-field (i.e. absence and presence of a magnetic field) is crucial to deploy them in real engineering applications. The common magneto-mechanical characterization experiments of MREs include static and dynamic compression, tensile, and shear tests in both off-field and on-field. This review article aims to provide a comprehensive overview of the magneto-mechanical characterizations of MREs along with brief coverage of the MRE materials and their fabrication methods.

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A review on magneto-mechanical characterizations of magnetorheological elastomers

textCurrently, companies spend a great deal of effort on Corporate Social Responsibility (CSR) disclosures. CSR disclosure relates to the provision of information on companies' environmental and social performance. From an economic perspective, companies might disclose this information to avoid or decrease potential political costs. We construct a CSR disclosure index based on the Global Reporting Initiative (GRI) guidelines. Using content analysis, we analyze 130 listed German companies' CSR disclosures (470 firm-year observations) to investigate the determinants of these voluntary disclosure activities. Our results show that, consistent with the political cost theory, German companies' disclosures of all CSR issues are affected by their visibility, shareholder structure, and relationship with their US stakeholders. In addition, higher profitability is associated with more environmental disclosures. Finally, size and industry membership affect the amount of CSR disclosure.

Determinants of voluntary CSR disclosure: Empirical evidence from Germany

/pdf/a-review-on-the-fused-deposition-modeling-fdm-3d-printing-stu4vuyk9r.pdf

A review on the fused deposition modeling (FDM) 3D printing: Filament processing, materials, and printing parameters

This study proposes the design and fabrication of a natural rubber-based magnetorheological elastomer (NR-MRE) engine mount as a new device in absorbing the vibration originated from the automotive engine. The conceptual design was performed through a simulation process by Finite Element Method Magnetics to analyze the magnetic field distribution. The simulation result had indicated that the device was capable of generating an equivalent magnetic field density of 0.31 T at the effective area. The MRE was prepared by utilizing 60 wt% of carbonyl iron particles (CIPs), and the cavity was filled by compression molding. The MRE compound was tested based on its basic mechanical properties, while the MRE engine mounts were tested under a static compression load at off- and on-state conditions. It was observed that the compound possessed a good tensile strength for a load bearer matrix with an average of 12.65 MPa. Subsequently, the results of the static compression load had showed that the MRE engine mounts recorded an increase of 12% in the force generated as compared to conventional engine mounts at an off-state condition. Meanwhile, at an on-state condition of 2.4 A, the MRE engine mounts recorded an increase in the force generated with 106%. The study has demonstrated that the proposed device can be one of the potential candidates for vibration control applications due to its stiffness controllability.

/pdf/semi-active-controllable-stiffness-engine-mount-utilizing-q4i1bjvh.pdf

Semi-Active Controllable Stiffness Engine Mount Utilizing Natural Rubber-Based Magnetorheological Elastomers

Background: Community service was carried out to increase household income in the Serdang village, Curug district, Tangerang regency, by breeding and rearing Peking ducks.
Contribution: Peking duck breeding and rearing farming is considered relatively low in maintenance, attainable ducklings, and affordable feed; while the problem of Peking duck breeding and rearing farming is the lack of capital.
Method: The implementation methods consist of: the planning stage, the implementation stage, and the evaluation stage.
Results: The result of this community service is the achievement of total 2,597.9 Kg of ready-to-sell Peking ducks, with the sales profit of Rp 17.950.750 per month. From the total of 1,100 heads initial ducklings reared the mortality rate of 91 occurred at the vulnerable age (5-15 days).
Conclusion: By the end of the second season of community service, 3 (three) participants become self-suffcient Peking duck breeders

/pdf/improve-household-income-through-peking-duck-farming-3hgviv0j.pdf

Improve Household Income Through Peking Duck Farming

This paper aims to find the themes of propagation of Islam Prophet Muhammad in the early spread of Islam that can be used uswah h}asanah by preachers in Indonesia in spreading Islam in accordance with the present context. Letters were used as the data in this study are the letters sent by the Prophet Muhammad to the king superpower in the Roman and Persian kings and their little under the authority of the king of the superpower. The letters are including in these types of letter are ten letters. Stanton thematic theory which states that the theme (theme) is contained in the meaning of a story, become the basic theory in this study. In addition, there is also a theme in the study of the distribution of known theme with theme of major and minor themes. In analyzing the data, before entering the core analysis, the author uses the method of analysis and match with sub-method translational match. In this case, the letters of the Prophet Muhammad first translated into Indonesian, after it analyzed according issues to be answered. The findings of this thematic analysis form the major theme of “propagation of Islam” whose content is tailored to the circumstances of the king recipients. Of the major themes, there are minor themes are used to support the universality of the major themes of these letters, they are: dakwah must be by the name of God, pray forsalvation only to Muslims, Jesus is not the son of God, all the religions of Semitic is unity of God (tawhid), religion God recognized only Islam, and Islam is tolerant religion. Tulisan ini bertujuan untuk mencari tema-tema dakwah Islam Nabi Muhammad pada awal penyebaran Islam yang dapat dijadikan uswah h}asanah oleh para da’i di Indonesia dalam menyebarkan agama Islam yang sesuai dengan konteks kekinian. Surat yang dijadikan data pada penelitian ini adalah surat-surat yang dikirim oleh Nabi Muhammad kepada para raja adidaya di Romawi dan Persi beserta raja-raja kecil yang berada di bawah kekuasaan kedua raja adidaya tersebut. Yang temasuk dalam jenis surat ini sejumlah sepuluh pucuk surat. Teori tematik Stanton dan Kenny yang menyatakan bahwa tema (theme) adalah makna yang dikandung sebuah cerita, menjadi landasan teori dalam penelitian ini. Selain itu, terdapat pula pembagian tema yang dalam kajian tema dikenal dengan tema mayor dan tema minor. Dalam menganalisis data, sebelum masuk pada analisis inti, penulis menggunakan metode analisis padan dengan submetode padan translasional. Dalam hal ini, surat-surat Nabi Muhammad tersebut diterjemahkan terlebih dahulu ke dalam bahasa Indonesia, setelah itu dianalisis sesuai permasalahan yang ingin dijawab. Temuan dari analisis tematik ini berupa tema mayor tentang “dakwah Islam” yang isinya disesuaikan dengan keadaan para raja penerima surat. Dari tema mayor tersebut, terdapat tema-tema minor yang digunakan untuk mendukung keuniversalan tema mayor surat-surat tersebut, yaitu berdakwah harus karena Allah, mendoakan keselamatan hanya untuk muslim, Nabi Isa bukananak Tuhan, seluruh ajaran agama semitik adalah pengesaan Allah, agama yang diakui Allah hanya Islam, dan Islam agama yang toleran.

Surat dakwah nabi muhammad saw (analisis tematik atas surat-surat nabi muhammad kepada para raja)

It is difficult to obtain suitable fire resistance and mechanical properties for glass-fiber-reinforced polymer (GFRP) roof material in industrial applications. Although some efforts to improve the fire resistance properties of GFRP have been carried out, in practice this sometimes degrades the mechanical properties. Therefore, the base materials, such as filler and reinforcing fiber, must be appropriately combined to simultaneously improve both fire resistance and mechanical properties. The present study examines improvements in GFRP roof material by investigating the effect of aluminium trihydrate (ATH) as a filler and the combination of a chopped strand mat (CSM) with woven roving (WR) and stitched mat (STM) fibers as the reinforcement in a composite GFRP roof structure. The roof samples were prepared following industrial machine standards using the specified materials. The mechanical properties of GFRP were evaluated using tensile, flexural and impact tests, following ASTM D638, ASTM D790 and ASTM D256 standards, respectively. The fire properties were examined through fire tests following the ASTM D635 standard. The results show that the GFRP roof composed of CSM/WR fibers had a 40% higher tensile strength (103.5 MPa) compared with the GFRP roof without CSM fibers (73.8 MPa). The flexural strength of the GFRP roof with CSM/WR fibers was also 57% higher than the roof without fibers, with a ratio of 315.61 MPa to 201 MPa. With the use of CSM/WR fibers, the fire resistance also increased by 23%, resulting in a ratio of 4.31 mm/min to 5.32 mm/min. These results demonstrate that the combination of CSM/WR fibers as a reinforcement would be an excellent option for producing an improved GFRP roof with better industrial properties, especially when producing improved GFRP roofs using a continuous lamination machine.

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Industrial Implementation of Aluminum Trihydrate-Fiber Composition for Fire Resistance and Mechanical Properties in Glass-Fiber-Reinforced Polymer Roofs

Magnetorheological (MR) materials are a group of smart materials used in new technologies with controlled reliability. The development of these materials is expanding, starting from MR fluids, elastomers, grease, and gel. This large number of material types further expands the various applications of MR materials as a creative technology to support performance enhancement. For example, MR fluid is used to improve the performance of shock absorbers such as vehicle suspension, the damping of building structures, and polishing of the workpiece. MR elastomers are used for engine mounting, insulation base, and many other applications with intelligent material properties such as stiffness controllability. However, there are still complexities in the practical implementation of the control system beyond reliability. Many previous studies have focused on the performance improvement and reliability of MR materials as smart materials for application devices and systems. In this review article, the specific discussion related to vibration control strategies in MR material-based systems was thoroughly investigated. To discuss this point, many MR applications including transportation system and vibration isolation were adopted using different types of control strategies. Many different control strategies that have been used for MR applications such as fuzzy logic control, optimal control, and skyhook control are discussed in-depth in terms of the inherent control characteristics of merits and demerits.

/pdf/a-review-on-vibration-control-strategies-using-30jf1o6h.pdf

Ubaidillah Ubaidillah

Papers

Semi-Active Controllable Stiffness Engine Mount Utilizing Natural Rubber-Based Magnetorheological Elastomers

Improve Household Income Through Peking Duck Farming

Surat dakwah nabi muhammad saw (analisis tematik atas surat-surat nabi muhammad kepada para raja)

Industrial Implementation of Aluminum Trihydrate-Fiber Composition for Fire Resistance and Mechanical Properties in Glass-Fiber-Reinforced Polymer Roofs

A Review on Vibration Control Strategies Using Magnetorheological Materials Actuators: Application Perspective