scholarly journals Eksplorasi material daur ulang kantong plastik dengan teknik origami

Author(s):  
Devanny Gumulya

Shopping plastic bag is a thermoplastic type LDPE and HDPE, that can be heated with hotpress. Through this recycling process come new material that can used for product material. The recycle plastic material has a lot of potential to be used as a product application. market research From founded many brands that try to recycle plastic still using another new material to give support to the plastic recycle material. Origami is a paper folding art that is commonly known by everyone. The study tried to apply the origami technique on recycled plastic bag material that has been heated with hotpress machine. With origami technique 90% the product can be made with this material entirely without the help of sewing and other materials. This is seen as an opportunity for the market that still use many new materials to support this material. The folding gives construction to the one sheet material and give new function to the recycle plastic material.  The research uses experimental method. Series of paper origami patterns are applied on the recycle material, till founded several folding that can be apply on the recycle plastic sheet material. The research result is a variety of functional products made with origami techniques that have been egistered design industry copy wright. 

2019 ◽  
Vol 4 (1) ◽  
pp. 13
Author(s):  
Devanny Gumulya

Indonesia has become the second larget plastic waste contributor in the world after China. Saddens by this fact, this research is conducted to recycle plastic bag waste. Fusion technique is a technique to fuse two or more plastic plies by heating them. It is easily done because the equipment need is very easy to find. With fusion technique the plastic waste can be turned into durable and waterproof material. In this research, a card wallet is made out of the recycle material. Carry goods is a commodity that is continuously needed by market. The research used material driven design process, in which tries to explore the recycle material both in technical and experiential qualities. Aside from material exploration, this research also studiesabout user perception regarding this material, this study is needed to remove the waste stigma. From the study founded thatemotional and performative are affecting each other. The three traits that user about plastic fusing material are pattern, contras color and transparency. The results are design recommendation on how to design using this new material and functional products like wallet designed with different style that express the material uniqueness.


Author(s):  
Devanny Gumulya ◽  
Febriyanti Febriyanti ◽  
Fenny Meilani

Currently we are accustomed to disposable packaging, the habit generates a lot of waste because we are used to buying, use and dispose of when the lifespan has been exhausted with a consumption pattern like this, Indonesia has now become the world's second-largest plastic waste-producing country. With the product design approach, the student of Universitas Pelita Harapan (UPH) was tasked to recycle plastic waste in UPH environment into a functional product. Based on the results of observation and interviews, one of the waste plastic accumulated in UPH environment is the plastic shopping bag. LDPE is a thermoplastic. A type of plastic that can be formed repeatedly trough heat. The process starts by collecting, sorting, washing, then began the recycling process by heating it with oven and put them unto the mold.  The purpose is to create new material that has an aesthetic quality and good structure. After the waste is processed into a functional product, the results are socialized to students from other majors in a workshop, where each participant must bring their own plastic waste materials. The result of this research and community service is a reduction in  shopping bags waste that exists in UPH environment by 1%, increases millennials' awareness about plastic waste in UPH, and change their perception that garbage plastic bag shopping is not rubbish that should be discarded, but a material that is ready to be recycle and made into a functional product.  


Author(s):  
György Darvas

The paper makes an attempt to resolve two conceptual mingling: (a) the mingling of the two interpretations of the concept of orderedness applied in statistical thermodynamics and in symmetrology, and (b) the mingling of two interpretations of evolution applied in global and local processes. In conclusion, it formulates a new interpretation on the relation of the emergence of new material qualities in selforganizing processes on the one hand, and the evolution of the universe, on the other. The process of evolution is a sequence of emergence of new material qualities by self-organization processes, which happen in negligible small segments of the universe. Although thermodynamics looks at the universe as a closed (isolated) system, this holds for its outside boundaries only, while the universe has many subsystems inside, which are not isolated (closed), since they are in a permanent exchange of matter, energy, etc. with their environment (with the rest of the universe) through their open boundaries. Any ";;emergence";; takes place, i.e., all new qualities come into being just in these small open segments of the universe. The conditions to apply the second law of thermodynamics are not present here. Therefore, global evolution of the universe is the consequence of local symmetry decreases, local decreases of orderedness, and possible local decreases of entropy.


An analysis is given for the deformation of a cantilever made from a rigid-plastic material struck transversely at its tip by a moving mass. Two special cases are found to be of interest: mass of striker large, and mass of striker small. Experiments were carried out on model mildsteel cantilevers under these two extreme conditions: in the one case the striker was a falling weight, in the other a rifle bullet. The theoretical and experimental results are compared, and it is shown that there is good agreement at points remote from the impact, but that prediction of local damage depends on accurate definition of the conditions of striking.


1999 ◽  
Vol 583 ◽  
Author(s):  
L. Hansen ◽  
A. Ankudinov ◽  
F. Bensing ◽  
J. Wagner ◽  
G. Ade ◽  
...  

AbstractUp to 1011 cm−2 InAs quantum dots (QD) can be grown on Silicon(001) by molecular beam epitaxy. This very new material system is on the one hand interesting with regard to the integration of optoelectronics with silicon technology on the other hand it offers new insight into the formation of QDs. We report on RHEED, TEM and Raman studies about (in-) coherence of the QDs and on an according to our knowledge so far unknown dewetting transition in this material system. The results are being discussed on the basis of a thermodynamic model, assuming a liquid-like behavior of a strained adlayer.


Plant Disease ◽  
2010 ◽  
Vol 94 (2) ◽  
pp. 276-276 ◽  
Author(s):  
D. B. Marcum ◽  
K. Perez ◽  
R. M. Davis

In August of 2009, powdery mildew was observed on peppermint (Mentha piperita L.) in several commercial fields in the Fall River Valley of eastern Shasta County, California. Plant growth was apparently reduced by the disease, but its impact on yield was unknown. White fungal growth was restricted to the adaxial surfaces, where colonies were thin and effused. Heavily infected leaves developed a reddish tint as growth prematurely ceased. Doliform conidia ([26.6-] 29.2 [-31.7] × [13.2-] 15.6 [-16.8] μm) were produced in chains of approximately six conidia. Foot cells were cylindrical ([41.3-] 55.2 [-75.0] × [11.2-] 12.0 [-12.8] μm). Immature chasmothecia were yellowish brown and approximately 100.0 μm in diameter with flexuous, mycelium-like appendages up to 200 μm long. All these features were consistent with those of Golovinomyces biocellatus. Asci were not observed. To confirm the identity of the fungus, nuclear rDNA internal transcribed spacer (ITS) regions were amplified by PCR with universal primers ITS4 and ITS5. The sequence (537 bp) was an exact match for several submissions of G. biocellatus in GenBank (e.g., Accession No. EU035602, a sequence of the fungus from mint in Australia [1]). Pathogenicity was confirmed by brushing spores from naturally infected leaves onto three rooted cuttings of M. piperita ‘Black Mitchum’. After the plants were covered with a plastic bag for 36 h to maintain high humidity, they were kept on a greenhouse bench at 23 to 28°C. Three noninoculated plants, which served as controls, were placed in another greenhouse in similar conditions. The experiment was repeated once. All inoculated plants developed signs of powdery mildew within 7 days of inoculation whereas noninoculated plants remained disease free. The fungus on inoculated leaves was morphologically indistinguishable from the one used to inoculate the plants. To our knowledge, this is the first report of G. biocellatus on peppermint in California. References: (1) J. R. Liberato and J. H. Cunnington. Australas, Plant Dis. Notes 2:38, 2007.


2020 ◽  
Vol 3 (2) ◽  
pp. 50
Author(s):  
Anisa Anisa

The aim of this study was to test the effect of capital structure on firm value. Meanwhile, ‘profitability’ served as the mediating variable on the mining companies which have been go public and registered in Indonesia Stock Exchange. This study belonged to quantitative research and it was expected to successfully measure the effects between the variables. Data collection was performed by using secondary data from the official website of Indonesia Stock Exchange (BEI), which is IDX, related to the 21 mining companies registered in BEI, of which these companies achieved profits in a period of three years (2016, 2017 and 2018). Data processing was performed by using a program so-called Smart Pls 3.0. The first result of this study implied that the variable namely ‘profitability’ was the one that partially mediated the effect of the capital structure on the firm value. The second result was that no direct effect was found between capital structure and firm value. As for the next research result, profitability has no impact on the firm value. The companies with the ever growing risks would lead the creditor to increase the interest rates, resulting in the increment of the company’s average capital costs. The companies who possessed big amount of debts tended to had higher average capital costs so the values of the companies were rather falling off.       Keywords : capital structure, firm value, profitability  


PEDIATRICS ◽  
1959 ◽  
Vol 24 (4) ◽  
pp. 637-637
Author(s):  
BARBARA M. KORSCH

This "practical manual for reasonable parents" presents an odd combination of information. On the one hand there are a series of simple practical recommendations for infant care and child rearing through adolescence, based on currently accepted principles from psychology, psychoanalysis and related fields. On the other hand there are a number of condensed theoretic psychoanalytic expositions on topics such as the stages of early psychosexual development and the traditional concept of the oedipal situation. The practical portions of the text concerning feeding schedules and other aspects of infant care as well as the later chapters on parental handling of children of school age and adolescence are non-controversial, but also fail to present any new material or even a new approach.


2005 ◽  
Vol 297-300 ◽  
pp. 622-627 ◽  
Author(s):  
Hyouk Ryeol Choi ◽  
Kwang Mok Jung ◽  
Ja Choon Koo ◽  
Jae Do Nam ◽  
Young Kwan Lee ◽  
...  

ElectroActive Polymers (EAPs) are emerging as new actuating means replacing the existing technologies such as piezoelectric, electrostatic, SMA etc. The dielectric elastomer actuator is regarded as the one of the most practically applicable actuators in the near future among the EAPs. In this paper, we introduce a new material capable of being employed as the dielectric elastomer actuator. The proposed material, which is a kind of the synthetic rubber, produces larger deformation as well as higher enegy efficiency, since it has a much higher dielectric constant compared to the previous ones. Beginning with the method of material synthesis, we give the description of its basic material properties by comparing with those of the existing materials for the dielectric elastomers. Also, the advantages of the proposed material as the actuating means are discussed with the several results of the experiments.


Locke Studies ◽  
2008 ◽  
Vol 8 ◽  
pp. 125-167 ◽  
Author(s):  
Philip Milton

Shortly after Locke’s death, Jean Le Clerc began collecting materials for the short biography he was planning to publish in the periodical he edited, the Bibliothèque Choisie. He had known Locke in Holland but had very little knowledge of his earlier career in England, and he sought information from some of his English friends. One of these was Lady Masham, who sent a long letter detailing what she knew or had been able to find out from some of Locke’s other friends. One of the things she mentioned was that Locke had once received, but had turned down, the offer of a pardon: After the Death of King Charles, Mr. Penn (with whom Mr. Locke had been long before acquainted in the Universitie, and than whom no man did ever more generously make use of Court Favour for the Service of others) undertook to procure a Pardon for Mr. Locke of King James and (as I am told) it was actually offer’d him, but he would not accept of it as not owning that he needed it. Le Clerc was deeply appreciative for information of this kind, and in his biography, published a few months later, he repeated Lady Masham’s account almost word for word: Après la mort du Roi Charles II, qui arriva le 16. de Fevrier 1685. Mr. Penn, que Mr. Locke avoit connu dans l’Université, & qui employa avec beaucoup de génerosité le credit, qu’il avoit alors auprè du Roi Jaques, enterprit d’en obtenir un pardon pour lui, & l’auroit en effet obtenu; si Mr. Locke n’avoit répondu qu’il n’avoit que faire de pardon, puis qu’il n’avoit commis aucun crime. Le Clerc’s account was quickly translated into English and was published the following year. During the remainder of the eighteenth century many further short biographies of Locke were published, but these contained nothing new, in most cases being simply paraphrases or abridgements of Le Clerc’s account. It was not until 1829, when Lord King published The Life and Letters of John Locke, that any new material came to light. King accepted Le Clerc’s account of Penn’s efforts on Locke’s behalf, but he added that Locke had also received similar help from the Earl of Pembroke. In support of this he published, from Locke’s papers, a letter from Pembroke, written in August 1685, which, though it did not specifically mention a pardon, certainly did show that Pembroke had spoken to James II on Locke’s behalf and had received assur- ances from him. King also printed a letter from another of Locke’s friends, David Thomas, which mentioned that James Tyrrell had told him that ‘Will. Penn hath moved the King for a pardon for you, which was as readily granted’. This letter was dated November 1687, but King did not explain how the pardon Locke had now been granted related to the one he had supposedly turned down two years previously.


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