bluuebunny/crossref_metadata_2025_split huggingface dataset:
Fabrication of Microchannels by Using the CO2 Galvo Laser Marking Machine and Thermo-mechanical Sealing Method
Authors: Anh Tam Ho , Viet Hung Nguyen , Huu Duc Nguyen , Thi Huong Giang Do 
Published: June 2019

Abstract: Microchannel in microtechnology is a channel with a hydraulic diameter below 1 mm. Microchannels are primarily used in biomedical devices and microfluidic applications. Fabrication of microchannels has always been a complex task even at the world centres of excellence. This article addresses the fabrication techniques for creating microchannels using a 40W CO2 Galvo laser marking machine. It was able to control the channel dimensions by changing the power, scanning speed, and scanning time of the laser source. The results show that the created channel width increased as the laser power increased and the scanning speed decreased. Similarly, the channel depth increased as the laser power increased. Successfully tested in the laminar flow and droplet modes, the created microchannels were sealed using the thermo-mechanical method at 220oC. This is a new method for faster and cheaper production of microdevices that could be explored for sustainable development in the industry. The article concludes that with an appropriate solution, microchannels with minimal width and depth dimensions of 50 µm × 50 µm can be developed with channel roughness of 2-3µm.
Keywords: Microfluidics, microchannels, CO2 marking machine, Galvo, mechanical sealing method.
References:
[1] G. Satish Kandlikar, Heat transfer and fluid flow in minichannels and microchannels. Amsterdam, The Netherlands: Elsevier B.V. (2006) p. 450. ISBN 978-0-08-044527-4. [2] D.B. Tuckerman and R.F.W. Pease, (1981). High-performance heat sinking for VLSI. IEEE Electron device letters, 2(5) (1981) 126-129. https://dx.doi. org/10.1109/EDL.1981.25367 [3] M.R. Salimpour, A.T. Al-Sammarraie, A. Forouzandeh and M. Farzaneh, Constructal design of circular multilayer microchannel heat sinks. Journal of Thermal Science and Engineering Applications, 11(1) (2019)011001. https://dx.doi. org/10.1115/1.4041196[4] Petra S. Dittrich, Lab-on-a-chip: microfluidics in drug discovery Nature, 442 (2016) 210-224.[5] D. Mark, Microfluidic Lab-on-a-Chip Plastforms: Requirements, Characteristics and Applications, NAPSA, 24 (2010) 305.[6] Shashi Prakash and Subrata Kumar, Fabrication of microchannels: A review, Proc IMechE Part B: J Engineering Manufacture, Vol. 229(8) (2015) 1273–1288[7] George M. Whitesides, The origins and the future of microfluidics, Nature, 442 (2006) 368-384.[8] Chee M.B. Ho, 3D printed microfluidics for biological applications, LabChip1, 5 (2015) 3627.[9] B. Ekstrom, G. Jacobsson, O. Ohman, et al. Microfluidic structure and process for its manufacturing. Patent WO 91/16966, 1990[10] Dong Qin, Soft lithography for micro and nano patterning, NatureProtocals, 5 (2010) 491-510.[11] Shashi Prakash, Experimental and theoretical analysis of defocused CO2 laze microchanneling on PMMA for enhanced surface finish, JMM, 27 (2016) 250.[12] Beat Jaeggi, Time-optimized laze micro machining by using a new high dynamic and high precision galvo scanner, Proceedings, (2016) 9735.
PERENCANAAN PENGUMPULAN DAN PENGANGKUTAN SAMPAH DI KECAMATAN TANGERANG, KOTA TANGERANG
Authors: . Ratnaningsih , Purwaningrum Pramiati , Pusparani Amelia 
Published: June 2019

<p>Kecamatan Tangerang mempunyai luas wilayah sekitar 1.578,5 Ha, dengan jumlah penduduk sebesar 148.771 jiwa, Berdasarkan data Dinas Kebersihan dan Pertamanan Kota Tangerang, total timbulan sampah di Kecamatan Tangerang <br />pada tahun 2010 sebesar 333,25 m 3 /hari dan yang terangkut sebesar 239,94 m 3 /hari, sehingga tingkat pelayanan di Kecamatan Tangerang sebesar 72%. Tujuan dari penelitian ini adalah untuk merencanakan suatu sistem pengumpulan <br />dan pengangkutan sampah yang lebih efektif dan efisien dengan mencari alternatif dari sistem pengelolaan sampah. Terdapat 2 alternatif yang direncanakan untuk pengelolaan sampah. Alternatif I, yaitu dengan menghitung dump truck sesuai dengan kebutuhan yang diperlukan. Sedangkan, alternatif II dengan perubahan jalur angkut dan pembangunan TPST. Periode perencanaan direncanakan untuk 10 tahun mendatang hingga tahun 2020 yang dibagi dalam 2 (dua) tahap, yaitu Tahap I (Tahun 2014) tingkat pelayanan 76% dan Tahap II (Tahun 2019) tingkat pelayanan menjadi 83%. Pemilahan direncanakan dilakukan di sumber dengan membedakan sampah organik dan anorganik. Pola pengumpulan sampah untuk permukiman dengan rumah permanen kategori A menggunakan pola individual langsung dan pola individual tidak langsung. Untuk permukiman dengan rumah permanen kategori B dan permanen kategori C <br />menggunakan pola komunal tidak langsung dan pola individual tidak langsung. Untuk non permukiman menggunakan pola individual langsung. Pengangkutan sampah berdasarkan jalur jalan armada yang sudah ditentukan. Sampah yang <br />telah terkumpul dari pola individual langsung maupun pola individual tidak langsung dibawa ke TPA Rawa Kucing. Pada perencanaan ini direncanakan pembangunan TPST untuk pengolahan sampah. Pembangunan TPST tersebut <br />berlokasi di Kelurahan Cikokol, dikarenakan masih adanya lahan kosong untuk tempat pengolahan. Sampah yang akan diolah di TPST sebesar 40% dari total timbulan sampah. Tujuan Pembangunan TPST ini juga berupaya mengurangi <br />sampah yang dibuang ke TPA Rawa Kucing di Kecamatan Tangerang.</p><p>Keywords: waste, collection, transportation, TPST</p>
STUDI PENGOLAHAN LUMPUR INSTALASI PENGOLAHAN AIR MINUM TAMAN KOTA - JAKARTA BARAT
Authors: Alfa Julian Dedi , Lindu Muhammad , . Winarni 
Published: June 2019

<p>Instalasi pengolahan air minum (IPA) Taman Kota, Jakarta Barat, memiliki kapasitas disain 200 liter/detik, dan air baku berasal dari Cengkareng Drain dan terdapat unit prasedimentasi sebelum air baku masuk ke IPA. Digunakan IPA konvensional yang dilengkapi dengan unit bio filter untuk mengabsorbsi zat organik di air baku. Lumpur berasal dari unit sedimentasi yang dibuang secara rutin setiap 10 menit dengan volume lumpur rerata 144,93 m3/hari dan pada kondisi maksimum 628,30 m3/hari, unit biofilter yang dibuang secara berkala saat dilakukan pengurasan bak yaitu 150,10 m3/hari, serta unit saringan pasir cepat yang membuang air bekas backwash filter secara berkala dan dalam waktu yang singkat sebesar 468,86 m3/hari. Mempertimbangkan perbedaan karakteristik lumpur yang dihasilkan, direncanakan 2 unit tanki penampung (ekualisasi) terpisah yaitu tanki pertama menerima lumpur sedimentasi serta tanki kedua menerima lumpur pengurasan bio filter dan air bekas backwash filter. Memperhatikan luas lahan yang tersedia, maka lumpur sedimentasi yang terkumpul di tanki penampung dipompa menuju ke unit thickener dan selanjutnya ke unit dewatering mekanik. Studi perbandingan dilakukan terhadap 3 opsi peralatan dewatering mekanik dengan mempertimbangkan volume lumpur yang dapat direduksi, biaya investasi, serta biaya operasional dan energi. Peralatan dewatering mekanik terpilih adalah belt filter press yang mereduksi lumpur sedimentasi menjadi 4,20 m3/hari, dan pada kondisi maksimum menjadi 18,20 m3/hari. </p><p>Keywords: water treatment plant, sludges, backwashed water, dewatering</p>
ESTUDO SOCIOAMBIENTAL DA BACIA DO RIO PARDO: IRRIGAÇÃO, MONOCULTURAS E CRISE HÍDRICA
Authors: Cunha Joaci De Sousa , Oliveira Gilca Garcia , Andrade Maicon Leopoldino de 
Published: June 2019

<p class="Padro">Resultado de pesquisa realizada pelo Centro de Estudos e Ação Social, o presente relatório expoe de forma direta, sem maiores análises, os resultados da investigação realizada por seus autores a respeito da problemática socioambiental na bacia hidrográfica do rio Pardo, especialmente em suas porções média, no sudoeste da Bahia, e alta, no norte de Minas Gerais.</p><p class="Padro">De Porto de Santa Cruz, em Cândido Sale saté, até desaguar em Canavieiras, o rio Pardo percorre 345 km em terras baianas do seu trajeto total de 565 km. É verdade que a cada período com menos água. Não por causa exclusiva da redução das chuvas. Mas porque agora suas águas têm dono, ou será que poderíamos dizer expropriadores?...</p>
High-Temperature Synthesis of CdSe-Based Core/Shell, Core/Shell/Shell, and Core/Graded-Shell Nanoplatelets for Stable and Efficient Narrowband Emitters
Authors: Rossinelli Aurelio A. , Rojo Henar , Mule Aniket S. , Aellen Marianne , Cocina Ario , De Leo Eva , Schäublin Robin , Norris David J. 
Published: June 2019

Colloidal semiconductor nanoplatelets exhibit exceptionally narrow photoluminescence spectra. This occurs because samples can be synthesized in which all nanoplatelets share the same atomic-scale thickness. As this dimension sets the emission wavelength, inhomogeneous linewidth broadening due to size variation, which is always present in samples of quasi-spherical nanocrystals (quantum dots), is essentially eliminated. Nanoplatelets thus offer improved, spectrally pure emitters for various applications. Unfortunately, due to their non-equilibrium shape, nanoplatelets also suffer from low photo-, chemical, and thermal stability, which limits their use. Moreover, their poor stability hampers the development of efficient synthesis protocols for adding high-quality protective inorganic shells, which are well known to improve the performance of quantum dots. Herein, we report a general synthesis approach to highly emissive and stable core/shell nanoplatelets with various shell compositions, including CdSe/ZnS, CdSe/CdS/ZnS, CdSe/CdxZn1–xS, and CdSe/ZnSe. Motivated by previous work on quantum dots, we find that slow, high-temperature growth of shells containing a compositional gradient reduces strain-induced crystal defects and minimizes the emission linewidth while maintaining good surface passivation and nanocrystal uniformity. Indeed, our best core/shell nanoplatelets (CdSe/CdxZn1–xS) show photoluminescence quantum yields of 90% with linewidths as low as 56 meV (19.5 nm at 655 nm). To confirm the high quality of our different core/shell nanoplatelets for a specific application, we demonstrate their use as gain media in low-threshold ring lasers. More generally, the ability of our synthesis protocol to engineer high-quality shells can help further improve nanoplatelets for optoelectronic devices.
Asymptotic Behavior of the Hartree-exchange and Correlation Potentials for Fractional Electron Numbers in Atoms
Authors: Gould Tim , Pittalis Stefano , Toulouse Julien , Kraisler Eli , Kronik Leeor 
Published: June 2019

We report on previously unnoticed features of the exact Hartree-exchange and correlation potentials for atoms with fractional electron numbers. We show that these potentials, when treated separately, can reach non-vanishing asymptotic constant values in the outer region of spherical, spin unpolarized atoms. In the next leading order, the potentials resemble Coulomb potentials created by effective charges which have the peculiarity of not behaving as piecewise constants as a function of the electron number. We provide analytical derivations and complement them with numerical results using the inversion of the Kohn-Sham equations for interacting densities obtained by accurate quantum Monte Carlo calculations. The present results expand on the knowledge of crucial exact properties ofKohn-Sham systems, which can guide development of advanced exchange-correlation approximations.
Desain Propeller Kapal Selam 29 meter Dengan Menggunakan Propeller B-Series
Authors: Kusuma Cahya , Ariana I Made 
Published: June 2019

Kapal selam mini 29 meter dengan diameter hull 3 meter dan displacement 130T sangat cocok untuk perairan Indonesia barat yang dangkal karena memiliki beberapa kelebihan. Perhitungan powering terutama tahanan kapal dilakukan dengan menggunakan metode MIT dan metode kapal pembanding untuk mendapatkan koefisien Admiral. Berdasar dari hasil perhitungan kedua metode tersebut dilakukan perancangan propeller. Propeller didesain dengan menggunakan Propeller B series. Penggunaan propeller B-series lebih disebabkan karena kelengkapan data dan informasi performa serie tersebut bila dibandingkan dengan seri propeller lainnya. Dari analisa kebutuhan thrust dan ketersediaan daya mesin, maka propeller B5-60 ternyata layak dipakai sebagai propulsor kapal selam mini 29 m.
Kajian Pemanfaatan Energi Arus Laut Di Indonesia
Authors: Kasharjanto Afian , Rahuna Daif , Rina Rina 
Published: June 2019

Masih belum banyak lembaga penelitian yang melakukan kegiatan penelitian tentang potensi energi arus laut di Indonesia. Tetapi mengingat cadangan sumber energi fosil yang semakin lama akan terus berkurang, maka penelitian tentang potensi energi ini harus terus dilakukan .Untuk tujuan tersebut, Pemerintah telah mengeluarkan sejumlah kebijakan agar penelitian mulai lebih fokus pada pengembangan energi terbarukan khususnya dari laut, mengingat Indonesia sebagai Negara Kepulauan yang memiliki banyak Selat.Pemerintah telah berkomitmen untuk dapat meningkatkan kontribusi Energi Baru Nasional dari 17% saat ini menjadi 23 % pada tahun 2025 nanti. Turut berkontribusi dalam semangat tersebut,Balai Teknologi Hidrodinamika (BTH) telah meng-inisiasi kegiatan penelitian sumber energi arus laut melalui penelitian berbagai tipe turbin Poros vertikal sejak tahun 2006. Terakhir pada tahun 2017 telah dilakukan uji kinerja Turbin Ganda (twin turbine) di Jembatan Suramadu.Meskipun belum mencapai hasil maksimal, tetapi hasilpenelitian tersebut diharapkan dapat meng-inisiasi dan dijadikan sebagai referensi bagi kegiatan penelitian Turbin arus laut lainnya. Penelitian juga telah menghasilkan dua buah sertifikat Paten. Paper ini hanyalah sebagai informasi perkembangan penelitian energi arus laut di BTH dan prospek ke depannya bagi pengembangan penelitian di Indonesia
Optimalisasi Penempatan Sensor Untuk Pengukuran Distribusi Tekanan Model Kapal Bersayap
Authors: Nasir Muchammad , Syafiul Ahmad 
Published: June 2019

Efek fenomena hidrodinamika yang perlu dikaji dalam perancangan operasional proses pendaratan model WISE (Kapal bersayap) di air adalah masalah hydrodynamic impact pada konfigurasi badan (main hull) dan pontoon, untuk itu perlu dilakukan uji model proses landing pada model kapal bersayap tersebut. Untuk mengetahui hydrodynamic impact pada main hull dan pontoon model kapal bersayap di pasang beberapa sensor tekanan. Sebelum dilakukan Pemasangan sensor perlu dilakukan Simulasi pemodelan dengan menggunakan program komputer dengan menggunakan metode elemen hingga (FEM). Pada simulasi pemodelan ini main hull dan pontoon model kapal bersayap digambarkan dalam bentuk 3 Dimensi. Dari hasil simulasi dapat diperoleh distribusi tekanan yang terjadi pada main hull dan pontoon pada saat model dijatuhkan ke air, sehingga dapat digunakan sebagai acuan untuk optimalisai penempatan sensor tekanan pada model kapal bersayap.
Where is QDA hiding? An analysis of the discoverability of qualitative research support on academic library websites
Authors: Cain Jonathan , Cooper Liz , Demott Sarah , Montgomery Alesia 
Published: June 2019

This study explores the discoverability of qualitative research support services, using a purposive sample of academic library websites (n=95). These services were hard to find on most of the websites in our sample. In this paper, we outline the site characteristics that make discoverability easy or hard. Previous studies on qualitative resources at academic libraries have not addressed this topic. Our study fills this gap in the literature. Our aim is to provide information that can help libraries to improve the visibility of their resources for qualitative researchers and their students.
Teste do pezinho: o conhecimento das gestantes quanto a sua importância
Authors: Dos Reis Meillyne Alves , Xavier Silva Constanza Thaise , Carvalho de Sousa Najla Maria , Da Silva Marlucia Moreira 
Published: June 2019

Objetivo: identificar o conhecimento das gestante quanto à importância da realização do teste do pezinho. Método: Trata-se de uma pesquisa quantitativa e qualitativa, do tipo descritivo exploratório, desenvolvido numa instituição filantrópica credenciada ao Projeto Maternidade Segura e Parto Humanizado, na cidade de Anápolis, Goiás. Resultado: A amostra foi composta de 16 gestantes que realizaram o pré-natal, no período de junho a julho de 2014. A faixa etária mais prevalente foi de 29-39 anos de idade com 43,8%. Em relação ao nível de escolaridade a maioria possuia o ensino fundamental com 62,5% e prevaleceu o estado civil com 62,5%. Já em relação à rende familiar a maioria das gestantes, estavam entre 3 salários mínimos perfazendo 50% dos casos. Aanálise das falas das mulheres permitiu identificar que a maioria realizava o acompanhamento pré-natal regularmente e que estavam cientes da importância do teste do pezinho, mais ainda foi evidenciado um grande número de gestantes que desconhece a importância para a sa´´ude do seu recém-nascido. Conclusão: Não basta a penas informar da necessidade de realização do teste é preciso conscientizar e informar a futura mãe que a não realização do teste ocasiona um prejuízo inrreverssível na saúde da criança. Nesse sentido, é necessário salientar a importância da capacitação e o comprometimento dos profissionais de saúde atuantes nesse processo, a fim de repassarem aos pais as informações necessárias dos benefícios, e açoes educativas a cerca do teste do pezinho.
PENGARUH KEPUASAN KERJA TERHADAP KINERJA KARYAWAN (STUDI KASUS KARYAWAN NON MEDIS RS ISLAM SITI KHADIJAH PALEMBANG)
Authors: Damayanti Riski , Hanafi Agustina , Cahyadi Afriyadi 
Published: June 2019

This study aims to know how much the influence of job satisfaction on the Employees performance of Non Medical Employees of Rumah Sakit Islam Siti Khadijah Palembang. Job satisfaction is a happy emotional state or a positive emotion that comes from an assessment of work or a person's work experience that can effect the performance of employees, either directly or indirectly. This research is descriptive research with quantitative approach. The population used was 40 respondens. The result of this study indicate that there is the influence between the job satisfaction on the Employees performance of Non Medical Employees of Rumah Sakit Islam Siti Khadijah Palembang. This was proved by t-count the percentage of (2,309) > t-table (2,024) with a significance of 0,026 smaller than ? 0,05 (0,026 < ? 0,05).Keywords: Job Satisfaction, Performance
THE INFLUENCE OF JOB PROMOTION ON JOB SATISFACTION IN PT PUPUK SRIWIDJAJA PALEMBANG (CASE STUDY IN HUMAN RESOURCE DIVISION)
Authors: Safitri Karistya , Zunaidah Zunaidah , Bakri Supardi A 
Published: June 2019

The purpose of this research is to learn and understand the effect of job promotion on job satisfaction in PT Pupuk Sriwidjaja Palembang. The object of this research is employee in Human Resource Division of PT Pupuk Sriwidjaja Palembang with 45 employees as sample. The sampling method used in this research is sensus method. The method used for collecting data is by questionnaire. The data collected are tested by validity test, reliability test, simple linear regression analysis, correletion coefficient (r) and determination coenfficient (R2) and t test by using SPSS version 22. The result of this research shows that job promotion has positive and significant effect to job satisfaction in PT Pupuk Sriwidjaja Palembang. Keywords : Job Promotion, Job Satisfaction
Trissomia 21: Uma Perspetiva Multidisciplinar
Authors: Adrião Mariana , Maia Ana , Magalhães Augusto , Moura Carla , Alegrete Nuno , Casimiro de Andrade David , Correia Cíntia , Rebelo Joana , Tavares Marta , Gonçalves Edite , Guardiano Micaela 
Published: June 2019

INTRODUÇÃO: A trissomia 21 (T21) é a cromossomopatia mais frequente, independentemente do género, etnia ou classe social. Os recém-nascidos apresentam alterações fenotípicas e eventualmente malformações congénitas. O objetivo foi criar um artigo de revisão acessível e ajustado à prática clínica do pediatra para seguimento de crianças e jovens com T21, através de uma visão holística dos cuidados de saúde.
METODOLOGIA: Pesquisa dos artigos publicados em diferentes áreas, incluindo diretrizes de várias associações pediátricas. Revisão da literatura por especialistas em diferentes especialidades médicas com prática no seguimento de crianças e jovens com T21.
CONCLUSÃO: Através de uma avaliação e intervenção holísticas é possível continuar a melhorar os cuidados de saú-de da população pediátrica com T21. Isso reflete-se não só através do aumento da esperança média de vida, mas também na melhoria da qualidade de vida experienciada em todas as idades.
Comparative Toxicity of Neem and Peppermint Oils Nano Formulations against Agrotis ipsilon (Hufn.) Larvae (Lepidoptera: Noctuidae)
Authors: Dimetry Nadia Z. , A.H Amin , A.E Bayoumi , M. A. Abdel-Raheem , Dalia A. Youssef 
Published: June 2019

Applications of nanotechnology in agriculture will result in the development of efficient and potential approaches towards the management of insect pests. The toxicity effects of four essential oils peppermint, thyme, camphor and sage oils were tested against the fourth instar larvae of Agrotis ipsilon to select the most effective essential oil to be converted to the nano form. According to the results obtained, peppermint oil was the most toxic compound, which has been used in the present investigation compared with neem oil. The toxicity of bulk and nano- formulations of neem and pepper mint oils were tested against 2nd and 4th instar larvae of A. ipsilon under laboratory conditions of 25±2 °C& 65 -70 % R.H.relative humidity The results show that the LC50 value (the concentration used which kill 50% of the tested individuals)of loaded neem or pepper mint were lower (0.62 and 36.47 ppm) compared with neem or pepper mint oil nano-emulsion and bulk neem for the second larval instar. The different formulations of neem are more potent than in case of peppermint oil, as LC50 and LC90 values were significantly lower.The same trend was found concerning the 4th larval instar. Age of treated larvae had a detrimental effect on the response to the compounds tested. It was noticed that the younger larvae were much more sensitive to the prepared compounds compared to the older ones. The least LC50 value for loaded neem nano-emulsion was 6.68 ppm compared with the highest value for bulk neem oil (16.68 ppm ). Also, LC90 values followed the same trend as in case ofLC50. Again, the toxicity of loaded peppermint oil had the most insecticidal activity as expressed by the lowest LC50 value (51.9 ppm) with more insecticidal effect than the bulk(125.43 ppm) or nano-emulsion (85.43 ppm). The present results indicated that these novel systems could be used in integrated pest management program for A. ipsilon control.