scholarly journals Choosing the right strategy: cryogrinding vs. ball milling – comparing apples to apples

2021 ◽  
Author(s):  
Julia L. Shamshina ◽  
Robin S. Stein ◽  
Noureddine Abidi

Despite many reports on ball milling (BM) of chitin, the effect of cryomilling of chitin has not yet been reported, even though it is a solventless and environmentally-friendly method for the processing of chitin polymer.

2006 ◽  
Vol 2006 (5) ◽  
pp. 342-344 ◽  
Author(s):  
Hanakere R. Girisha ◽  
Gejjalagere R. Srinivasa ◽  
D. Channe Gowda

2021 ◽  
Vol 409 ◽  
pp. 128228
Author(s):  
Xiaoqin Wang ◽  
Shuhui Li ◽  
Jianying Huang ◽  
Jiajun Mao ◽  
Yan Cheng ◽  
...  

Author(s):  
Lavia Lavia ◽  
Petrus Rudi Kasimun

The condition of a child who does not have parents or a guide in life will be difficult to develop and grow well. It takes the right place for children to study together regardless of race, economy, and other problems. A place that becomes a home for children to learn and play together with the right people and understand very well about children's problems. Even parents always hope that their children can grow up to be children who have good and healthy personalities. But of course parents themselves are not perfect creatures who can teach it all. Because humans have their own skills and talents. Respectively Even having parents, there is no guarantee that parents really understand the child's condition. Very often parents do not understand or even pay less attention which of course affects the child's growth and development. Because humans naturally need other people to be role models or examples in their life. One solution that can address this problem is by designing a halfway house for street children that has appropriate facilities for child development, is environmentally friendly, and is located close to where street children are. Street children generally earn money on streets close to public transportation locations. some street children have been handled by an orphanage. However, the facilities and the number of orphanages are not proportional to the number of street children. So that not all street children can be handled properly. Designs are made not only for theoretical learning but also for developing other types of children's intelligence. The process of form and space is made according to the needs that will be needed by children in terms of health, hobby distribution, social interaction, and education. So that children can feel learning is not just a theory but can also be channeled into other forms of activity. Keywords: develop and grow well; house for street children; personalitites AbstrakKondisi anak yang tidak memiliki orangtua maupun penuntun dalam hidupnya akan sulit untuk berkembang dan tumbuh dengan baik. Diperlukan tempat yang tepat untuk anak dapat belajar bersama tanpa memandang ras, ekonomi, dan masalah lainnya. Tempat yang menjadi rumah untuk anak belajar dan bermain bersama dengan orang yang tepat dan paham betul tentang persoalan anak.  Orangtua sekalipun selalu berharap anaknya dapat tumbuh menjadi anak yang memiliki kepribadian baik dan sehat. Tetapi tentunya orangtua sendiri bukan mahkluk sempuran yang dapat mengajarkan itu semua. Karena manusia memiliki keahlian dan bakat masing – masing. Bahkan memiliki orangtua sekalipun tidak ada jaminan orangtua mengerti betul tentang kondisi anak. Sering sekali orangtua kurang memahami atau bahkan kurang memberikan perhatian yang tentu saja berpengaruh terhadap tumbuh kembang anak. Karena sewajarnya manusia memerlukan orang lain untuk menjadi panutan atau contoh dalam hidupnya. Salah satu solusi yang dapat menangani masalah tersebut dengan merancang rumah singgah untuk anak jalanan yang memiliki fasilitas yang sesuai untuk perkembangan anak ,ramah lingkungaan, serta letaknya dekat dengan dimana anak jalanan berada. Anak jalanan pada umumnya mencari uang dijalan berdekatan dengan lokasi transpotasi umum. beberapa anak jalanan sudah di tangani oleh panti asuhan. Akan tetapi, fasilitas serta jumlah panti asuhan tidak sebanding dengan jumlah anak jalanan. Sehingga tidak semua anak jalanan dapat tertangani dengan baik. Rancangan dibuat tidak hanya untuk belajar secara teori melainkan mengembangkan jenis kecerdasaaan anak lainnya. Proses bentuk dan ruang dibuat menyesuaikan dengan kebutuhan yang  akan dibutuhkan anak dari segi kesehatan, penyaluran hobi, interaksi sosial, dan edukasi.  Sehingga anak dapat merasakan belajar tidak hanya sekedar teori akan tetapi juga dapat disalurkan dalam bentuk aktivitas lainnya. 


Synlett ◽  
2021 ◽  
Author(s):  
Maki Minakawa ◽  
Keisuke Minami ◽  
Yuya Sato

AbstractA simple and environmentally friendly method to prepare S-heterocycles by cyclization of aromatic thiols and diols with H2O as a byproduct is described. The Sc(OTf)3-catalyzed dehydrative cyclizations of aromatic thiols and diols provided the corresponding thiopyran and thiophene derivatives. Control experiments were also performed to obtain insights into the reaction pathway


2018 ◽  
Vol 2018 ◽  
pp. 1-8 ◽  
Author(s):  
Stefany Fanelli ◽  
Alexander Zimmermann ◽  
Eliane Gandolpho Totóli ◽  
Hérida Regina Nunes Salgado

Amoxicillin is an antimicrobial agent that belongs to the penicillin compounds. Its bactericidal action causes a destruction of the cell wall of bacteria. It is widely used in clinical practice, and it belongs to the Brazilian National List of Essential Drugs (RENAME). In literature, there are some green analytical methods for the amoxicillin analysis; however, none of them is focused on its quantification in capsules. Therefore, the aim of this study was to validate an environmentally friendly analytical method for the analysis of this antimicrobial action in capsules, using spectrophotometry in the mid-infrared region. The analyses were performed in the spectral range of 1815–1736 cm−1, and the samples were analyzed as potassium bromide pellets. The method was validated according to the ICH guidelines and Brazilian legislation. Linearity, selectivity, precision, accuracy, and robustness were evaluated and showed adequate results for method validation, in a concentration range of 0.5–1.5 mg/pellet. Thus, it is concluded that the validated spectrophotometric method is able to quantify amoxicillin in capsules. In addition, it is a fast, economical, and environmentally friendly method, since it does not use organic solvents, and it can be used for quality control of routine analysis of this drug.


2017 ◽  
Vol 18 ◽  
pp. 01021
Author(s):  
Dorota Kopyto ◽  
Wit Baranek ◽  
Zbigniew Myczkowski ◽  
Katarzyna Leszczyńska-Sejda ◽  
Michał Drzazga ◽  
...  

Etching of copper with acidic CuCl2 solution is a widely used chemical method in printed circuits production. During the process, the solution is enriched in Cu(I) ions, resulting in reduction and then loss of etching bath capacity. In order to ensure the required etching kinetics, the solution is regenerated by oxidation of Cu(I) to Cu(II). The industrially applied Cu(I) oxidants are, e.g.: Cl2, chlorates. Their application is expensive and associated with drawbacks related to health, safety and environmental hazards (e.g. Cl2 emission). In the result of long-standing cooperation between the IMN and MATUSEWICZ Budowa Maszyn, an innovative, original and environmentally friendly method of acidic solutions regeneration used during printed circuits etching was developed. A new-type reactor equipped with oxidation monitoring-control systems using oxygen or oxygen-enriched air was applied. The reactor construction enables to run the process with oxygen circulation in the reactor, ensures full oxygen utilisation in the regeneration process, achievement of the required performance and process rate, and eliminates expensive, hazardous and often toxic reagents. This is an innovative method, and since there are no analogous technologies currently known and used in Europe and worldwide, the presented method is technologically, economically and ecologically unrivalled.


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