Littérature scientifique sur le sujet « Metodo 40Ar »
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Articles de revues sur le sujet "Metodo 40Ar"
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Jaya, Ananda Karuna, Caesar Ondolan Harahap et Rahmi Andarini. « Analisis Perhitungan Beban Pendinginan Ruang Dhammasala Vihara Padumuttara menggunakan Metode CLTD ». Ultima Computing : Jurnal Sistem Komputer 12, no 2 (19 novembre 2020) : 57–64. http://dx.doi.org/10.31937/sk.v12i2.1709.
Texte intégralRésumé :
Dhammasala room of Padumuttara Temple has an indoor temperature of 28,56oC and relative humidity of 80,6%. According to SNI 03-6572-2001 and a previous literature study, this temperature is outside the thermal comfort zone for tropical climate. Aiming to improve thermal comfort of Dhammasala room with an HVAC system efficiently, the cooling load of the room is analyzed using the Cooling Load Temperature Difference (CLTD) method. The results are also compared with results from other cooling load calculation sofware. The recommended HVAC System for Dhammasala room of Padumuttara Temple is a chiller with a capacity of 30-40TR.
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Amorta, Diksy Zeta, et Nurhidajah Nurhidajah. « SIFAT KIMIA DAN SENSORI SERBUK BERAS HITAM DENGAN VARIASI METODE PEMASAKAN DAN PENAMBAHAN BUBUK KEDELAI ». Jurnal Pangan dan Gizi 10, no 1 (3 mai 2020) : 64. http://dx.doi.org/10.26714/jpg.10.1.2020.64-77.
Texte intégralRésumé :
Black rice is one of the world's rice varieties, in addition to white rice, brown rice, and brown rice. The content of anthocyanin and its antioxidant activity is greater than other types of rice. Therefore, this research done as one effort to exploit black rice. The general purpose of this study was to determine the levels of anthocyanin, antioxidant activity, sensory properties and determine the best treatment. Cooking methods (roasting and oven) and the addition of soy powder (0, 10gr, 20gr, 30gr, 40gr). This study used a Factorial Completely Randomized Design with anthocyanin and DPPH antioxidant activity. The result of statistical test shows hat cooking method and addition of soybean powder have an effect on anthocyanin content, antioxidant activity and sensory properties. The best treatment was roasting and 10 gr from 10 gr weight of black rice with anthocyanin content 4,67 ppm, antioxidant activity 29,80%, sensory value 2,77 (close to likes) and protein value 14,68% . The value of water content in powdered black rice powder also in accordance with standard water content in powder powder ranges from 3% to 5%.
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Saputro, Sugeng Purwo, Dwi Ratih Purwaningsih et Bambang Priadi. « Peralihan Rezim Tektonik : Implikasinya pada Konsentrasi Torium di Mamasa dan Tana Toraja, Sulawesi-Indonesia ». EKSPLORIUM 41, no 2 (30 novembre 2020) : 87. http://dx.doi.org/10.17146/eksplorium.2020.41.2.6063.
Texte intégralRésumé :
ABSTRAK Mamasa dan Tana Toraja secara geografis merupakan bagian dari lengan barat Pulau Sulawesi. Batuan-batuan mafik di daerah tersebut dan sekitarnya memiliki nilai laju radiasi tinggi dan anomali kandungan torium (Th). Penelitian ini bertujuan untuk mengetahui mekanisme tataan tektonik yang berperan dalam peningkatan konsentrasi Th. Enam sampel batuan dianalisis menggunakan analisis petrografi dan geokimia (AAS, ICP-MS, NA, dan XRF), dilengkapi dengan pentarikhan umur menggunakan metode 40K-40Ar pada sampel batuan terpilih. Pengamatan petrografi memperlihatkan kehadiran mineral plagioklas, olivin, piroksen, hornblenda, nefelin, dan alanit pada batuan yang diidentifikasi sebagai nefelin-basanit, basalt, trakhibasalt, dan gabro. Sejumlah tekstur yang tampak pada batuan tersebut mengindikasikan kontaminasi dan perubahan kondisi tektonik. Analisis geokimia menunjukkan bahwa nefelin-basanit, basalt, trakhibasalt, dan gabro (absarokit) terbentuk pada batas kontinental aktif (ACM) yang sedang mengalami transisi dari subduksi aktif (penunjaman ke arah barat) menjadi post-subduksi. Perubahan tataan tektonik membuat magma membeku pada kondisi yang sangat ekstrim. Proses pembekuan magma diinterpretasikan terjadi pada umur sekitar 13,10-11,02 Ma. Mekanisme tersebut berperan penting terhadap terjadinya peningkatan konsentrasi torium di Mamasa dan Tana Toraja.ABSTRACT Mamasa and Tana Toraja geographically are part of the western arm of Sulawesi Island. The mafic rocks in these areas and their surroundings have high radiation dose rate and thorium (Th) anomaly content. This research aim is to determine tectonic setting mechanism which play the important role on the increasing of Th concentration. Six rock samples were analysed using petrography and geochemical analyses (AAS, ICP-MS, NA, and XRF) completed with the 40K-40Ar dating on selected rock samples. Petrography observations show plagioclase, olivine, pyroxene, hornblende, nepheline, and allanite minerals presence in the rocks which identified as nepheline-basanite, basalt, trachybasalt, and gabbro. Numbers of texture appearances in the rocks indicate contamination and changes on tectonic setting. Geochemistry analysis shows that nepheline-basanite, basalt, trachybasalt, and gabbro (absarokite) were formed at the active continental margin (ACM), which is undergoing active subduction (westward subduction) to post-subduction transition. The changing of tectonic setting made magma solidify in extreme conditions. The magma solidify process is interpreted to occur at the age of 13.10-11.02 Ma. These mechanisms play an important role for the increase of thorium concentration in Mamasa and Tana Toraja.
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Agnitias, Riska Surya, et Rusiyanto Rusiyanto. « Pengaruh Variasi Kuat Arus Terhadap Lebar Pemotongan dan Kekerasan pada Baja Karbon Sedang dengan CNC Plasma Arc Cutting ». Jurnal Dinamika Vokasional Teknik Mesin 4, no 2 (30 septembre 2019) : 99–104. http://dx.doi.org/10.21831/dinamika.v4i2.27391.
Texte intégralRésumé :
The purpose of this research is to determine the effects of current variation to the cutting kerf and hardness in medium carbon steel cutting process using CNC Plasma Arc Cutting. This research uses experimental methods to study the effect of a given treatment. The electric current was varied for 20, 25, 30, 35, and 40 amps. The test parameters were cutting kerf and hardness. The data were analyzed using descriptive statistics. The test result shows that there are differences in cutting kerf and hardness. The lowest kerf and hardness value was obtained from the 20 amps current, with a kerf of 1.64 mm and a hardness of 707.4 HV. The highest kerf and hardness value were obtained from the 40 amps current test, with a kerf of 2.58 mm and a hardness of 857.7 HV. This research concludes that the variation of electric current in CNC Plasma Arc Cutting process of medium carbon steel affects the kerf (99.59%) and hardness (94.17%). Tujuan penelitian ini adalah untuk mengetahui seberapa besar variasi kuat arus memberikan pengaruh terhadap lebar pemotongan (Kerf Width) dan kekerasan pada proses pemotongan baja karbon sedang dengan menggunakan CNC Plasma Arc Cutting. Metode yang digunakan dalam penelitian ini adalah metode eksperimen dengan tujuan untuk mengetahui pengaruh sebab akibat terhadap perlakuan yang diberikan. Variasi kuat arus yang digunakan dalam proses pemotongan ini adalah 20 A, 25A, 30A, 35A, dan 40A. Pengujian yang di lakukan adalah kekerasan dan lebar pemotongan (Kerf Width). Data yang diperoleh kemudian dianalisis menggunakan teknik analisis statistik diskriptif. Hasil penelitian yang diperoleh menunjukkan bahwa terjadi perubahan nilai lebar pemotongan (Kerf Width) dan nilai kekerasan. Nilai lebar pemotongan (Kerf Width) dan kekerasan terendah diperoleh pada penggunaan arus sebesar 20 A yaitu dengan nilai lebar sebesar 1,64 mm dan kekerasan sebesar 707,4 HV. Nilai lebar pemotongan (Kerf Width) dan kekerasan tertinggi diperoleh pada penggunaan arus sebesar 40A dengan nilai lebar 2,58 mm dan kekerasan sebesar 857,7 HV. Penelitian ini dapat disimpulakan bahwa variasi kuat arus pada proses pemotongan baja karbon sedang menggunakan CNC Plasma Arc Cutting memberi pengaruh sebesar 99,59% terhadap nilai lebar pemotongan (Kerf Width) dan sebesar 94,17% terhadap nilai kekerasan.
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Fridayati, Lucy, Rahmi Holinesti, Anni Faridah et Wirnelis Syarif. « ANALISIS KUALITAS SALA TERASI ». Jurnal Teknologi Pertanian Andalas 21, no 1 (1 mars 2017) : 22. http://dx.doi.org/10.25077/jtpa.21.1.22-27.2017.
Texte intégralRésumé :
Penelitian ini bertujuan untuk menganalisis pengaruh penggunaan terasi terhadap kualitas sala lauak yang dihasilkan. Penelitian ini merupakan eksperimen dengan metode rancangan acak lengkap (RAL), yang terdiri dari 3 perlakuan dan 3 ulangan. Hasil uji organoleptik pada kualitas sala terasi bentuk (bulat) bentuk (bulat) skor tertinggi terdapat pada perlakuan 40gr (X2) dengan kategori berbentuk bulat, kualitas bentuk (seragam) skor tertinggi terdapat pada perlakuan 0gr (X0) dengan kategori seragam, kualitas warna kulit (kuning kecoklatan) skor tertinggi terdapat pada perlakuan 60gr (X4) dengan kategori kuning kecoklatan, kualitas warna isi (kuning kecoklatan) skor tertinggi terdapat pada perlakuan 60gr (X4) dengan kategori mendekati kuning kecoklatan, kualitas aroma (terasi) skor tertinggi terdapat pada perlakuan 60gr (X4) dengan kategori mendekati sangat beraroma terasi, kualitas tekstur kulit (renyah) skor tertinggi terdapat pada perlakuan 60gr (X4) dengan kategori mendekati renyah, kualitas tekstur isi (berongga) skor tertinggi terdapat pada perlakuan 0gr (X0) dan 40 gr (X2) dengan kategori mendekati berongga, kualitas tekstur rasa (gurih) skor tertinggi terdapat pada perlakuan 50gr (X3)dengan kategorigurih, kualitas tekstur rasa (terasi) skor tertinggi terdapat pada perlakuan 60gr (X4) dengan kategori mendekati sangat beraroma terasi.Sala terasi memiliki kadar karbohidrat 32,16%; kadar protein 2,50%; kadar lemak 16,26%; kadar air 45,94%; dan kadar abu 2,54%.
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Noviyanti, Noviyanti, Rahmatina B. Herman et Joserizal Serudji. « Pengaruh Pemberian Air Rendaman Rumput Fatimah (Anastatica Hierochuntica) Terhadap Kadar Hormon Estrogen Pada Tikus Putih (Rattus Norvegicus) Bunting ». AcTion : Aceh Nutrition Journal 2, no 2 (3 novembre 2017) : 109. http://dx.doi.org/10.30867/action.v2i2.63.
Texte intégralRésumé :
Angka Kematian Ibu di Indonesia masih tinggi, salah satu penyebabnya adalah partus lama. Hormon estrogen merupakan salah satu hormon pemicu persalinan, defisiensi hormon ini dapat mengakibatkan persalinan menjadi lambat (partus lama). Rumput fatimah (Anastatica Hierochuntica) merupakan tanaman yang sering digunakan untuk memperlancar persalinan. Tujuan penelitian untuk menganalisis pengaruh pemberian air rendaman rumput fatimah terhadap kadar hormon estrogen pada tikus putih bunting. Jenis penelitian, eksperimental dengan desain Post-Test Only Control Group. Sampel terdiri dari 24 ekor tikus putih bunting yang dibagi menjadi 4 kelompok, yaitu kelompok kontrol dan 3 perlakuan P1, P2 dan P3 yang masing-masing diberi 10gr, 20gr dan 40gr rumput fatimah. Penelitian dilaksanakan di Animal house dan di Laboratorium Biomedik Fakultas Kedokteran Universitas Andalas. Hormon estrogen diukur dengan menggunakan metode ELISA. Uji Shapiro Wilk untuk mengetahui normalitas data dilanjutkan Uji One Way ANOVA lalu dilanjutkan dengan uji Multiple Comparisons (post hoc test) jenis Bonferroni. Hasil penelitian ini menunjukkan terdapat perbedaan signifikan (p<0,05) kadar hormon estrogen antara kelompok kontrol (55,51±7,60) dengan kelompok P2 (67,37±7,14) dan P3 (68,13±7,33) dengan dosis 20 gr dan 40 gr. Kesimpulan, terdapat peningkatan signifikan pada kadar hormon estrogen setelah pemberian air rendaman rumput Fatimah pada tikus putih bunting. Kata kunci: Rumput Fatimah (Anastatica Hierochuntica), Hormon Estrogen, Persalinan
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Safitri, Yunni, Afriwardi Afriwardi et Eny Yantri. « Pengaruh Pemberian Air Rendaman Rumput Fatimah (Anastatica Hierochuntica) Terhadap Kadar Hormon Oksitosin dan Hormon Prolaktin Pada Tikus Putih (Rattus Norvegicus) Menyusui Perbandingan ». Jurnal Kesehatan Andalas 8, no 1S (22 janvier 2019) : 31. http://dx.doi.org/10.25077/jka.v8i1s.923.
Texte intégralRésumé :
Rumput fatimah (Anastatica Hierochuntica) mengandung senyawa fitokimia seperti alkaloid, tanin, dan flavonoid yang merupakan bagian fitoestrogen. Tujuan Penelitian ini untuk menganalisis pengaruh pemberian air rendaman rumput fatimah (Anastatica Hierochuntica) terhadap hormon oksitosin dan hormon prolaktin pada tikus putih (Rattus Norvegicus) menyusui. Jenis penelitian ini adalah eksperimental dengan desain Post-Tes Only Control Group. Jumlah sampel 32 tikus menyusui yang dibagi menjadi 4 kelompok, yaitu kelompok kontrol dan 3 kelompok perlakukan P1, P2 dan P3 yang masing–masing diberi 10gr, 20gr dan 40gr rendaman Anastatica Hierochuntica. Penelitian dilakukan di Labor Farmasi dan Biomedik Universitas Andalas. Hormon oksitosin dan hormon prolaktin diukur dengan mengunakan metode ELISA. Uji statistik menggunakan uji Shapiro Wilk untuk mengetahui normalitas data, dilanjutkan One Way ANOVA dan untuk mengetahui perbedaan pada kelompok digunakan uji Multiple Comparisons (post hoc test) jenis Bonferroni. Hasil penelitian ini menunjukkan terdapat perbedaan signifikan (p<0,05) kadar hormon oksitosin antara kelompok kontrol (56,604±10,907) dengan kelompok P2 (44,095±6,117). Pada hormon prolaktin juga berbeda secara bermakna (p<0,05) antara kelompok kontrol (11,794±1,633) dengan kelompok P3 (16,991±3,735). Terdapat perbedaan yang bermakna terhadap pemberian air rendaman rumput fatimah (Anastatica Hierochuntica) terhadap hormon oksitosin dan hormon prolaktin pada tikus putih (Rattus Norvegicus) menyusui.
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A Fahrezi, Irgi, et Liliana Liliana. « Studi Kelayakan Pengaman Input-Output Trafo Distribusi Fuse Cut Out (FCO) dan NH Fuse di Area Payakumbuh ». MSI Transaction on Education 2, no 4 (19 novembre 2021) : 159–68. http://dx.doi.org/10.46574/mted.v2i4.66.
Texte intégralRésumé :
Pada penyalurkan energi listrik, gardu distribusi merupakan salah satu komponen utama. Pengaman yang tidak sesuai standar banyak ditemukan pada gardu distribusi, contoh nya penggunaan pengaman keluaran trafo step-down NH-Fuse melebihi batas standar yang ditentukan dan penggunaan FCO yang tidak sesuai dengan standar. Tujuan dari penulisan penelitian ini adalah mengetahui standar penggunaan pengaman Fuse Cut Out (FCO) dan NH Fuse pada PHB-TR dari sebuah gardu distribusi. Metode yang di gunakan adalah dengan melakukan perhitungan rating Fuse Cut Out (FCO) dan NH Fuse kemudian dibandingkan dengan data yang telah diperoleh lalu di analisis. Berdasarkan hasil perhitungan dan analisa ukuran Fuse Link pada trafo 25 KVA adalah 2A, pada trafo 50 KVA adalah 2A, pada trafo 100 KVA adalah 4A, dan pada trafo 160 KVA adalah 6A. Kemudian berdasarkan hasil perhitungan dan analisa ukuran NH Fuse pada trafo 25 KVA dengan 2 jurusan adalah 20A, pada trafo 50 KVA dengan 2 jurusan adalah 40A, pada trafo 100 KVA dengan 2 jurusan adalah 80A, pada trafo 160 KVA dengan 1 jurusan adalah 250A, dan pada trafo 160 KVA dengan 2 jurusan adalah 125A.
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Holinesti, Rahmi, Anni Faridah, Wirnelis Syarif et Lucy Fridayati. « ANALISIS KUALITAS SALA TERI ». Jurnal Teknologi Pertanian Andalas 21, no 1 (1 mars 2017) : 33. http://dx.doi.org/10.25077/jtpa.21.1.33-39.2017.
Texte intégralRésumé :
Peningkatan kualitas dari sala lauak yang bisa dilakukan adalah dengan cara memvariasikan rasa, salah satunya menggunakan teri. Penelitian ini bertujuan untuk menganalisis pengaruh penggunaan teri sebanyak 0gr, 20gr, 40gr, 60gr dan80gr terhadap kualitas bentuk, warna, aroma, tekstur dan rasa pada salateri yang dihasilkan. Penelitian ini termasuk ke dalam jenis eksperimen murni (trueeksperimen) dengan metode Rancangan Acak Lengkap.Penelitian ini dilakukan di workshop Tata Boga, Jurusan IKK, FPP, UNP. Variabel dalam penelitian terbagi dua yaitu, variabel X (penggunaan teri) dan variabel Y (kualitas sala teri). Data yang digunakan adalah data primer yang didapat langsung dari 30 orang panelis dengan cara mengisi angket. Data yang sudah diperoleh kemudian ditabulasikan dalam bentuk tabel dan dilakukan AnalisaVarian (ANAVA), jika berbeda nyata dilanjutkan dengan Uji Duncan. Hasil penelitian menunjukkan bahwa terdapat perbedaan pengaruh terhadap penggunaan teri dengan kualitas warna kulit, warna isi, aroma teri, dan rasa gurih. Sedangkan untuk kualitas bentuk bulat, bentuk seragam, aroma harum,tekstur kulit dan tekstur isi tidak terdapat perbedaan pengaruh yang signifikan karena Fh<Ft. Hasil analisis data diperoleh skor pencapain tertinggi secara keseluruhan yaitu kualitas bentuk (bulat) 3,19 (X3), kualitas bentuk (seragam) 2,98 (X3), kualitas warna kulit (kuning keemasan) 3,08 (X1), kualitas warna isi (kuning) 3,17 (X1), kualitas aroma (teri) 3,44 (X4), kualitas aroma (harum) 3,07 (X4), kualitas rasa (gurih) 3,22 (X4) kualitas tekstur kulit (renyah) 2,98 (X3) dan kualitas tekstur isi (berongga) 2,78 (X3). Sala teri memiliki kadar karbohidrat 36,37%; kadar protein 3,11%; kadar lemak 14,05%; kadar air 45,19%; dan kadar abu 1,70%.
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Ramadani, Risky, et Benteng H. Sihombing. « Pengaruh Pemberian ZPT Growtone Terhadap Pertumbuhan Stek Pucuk Dari Tunas Pucuk Tanaman Jambu Air Madu (Sizygium aqueum) ». Jurnal Akar 8, no 1 (29 mai 2020). http://dx.doi.org/10.36985/jar.v8i1.115.
Texte intégralRésumé :
Abstrak Penelitian ini bertujuan untuk mengetahui Pengaruh Pemberian ZPT Growtone Terhadap Pertumbuhan Stek Pucuk Dari Tunas Pucuk Tanaman Jambu Air Madu (Sizygium aqueum). Penelitian dilaksanakan di rumah kaca Fakultas Pertanian Universitas Simalungun terhitung dari bulan Juni sampai dengan Agustus 2018. Metode penelitian menggunakan Rancangan Acak Lengkap (RAL), dengan menggunakan Growtone sebagai ZPT, perlakuan Growtone sebanyak 4 aras, yaitu : P1 = 0.1 M, P2 = 0.2 M, P3 = 0.3 M, P4 = 0.4 M. Yang diulang sebanyak 3 kali dan tiap-tiap parameter yang diamati adalah persen stek hidup, jumlah tunas, dan tinggi tunas. Dari hasil penelitian, diketahui bahwa setiap perlakuan P1, P2, P3 dan P4 pada 4 MST, 8 MST dan 12 MST, persen hidup stek tidak berpengaruh nyata, dan untuk setiap perlakuan P1, P2, P3, dan P4, pada 4 MST, 8 MST dan 12 MST, jumlah tunas juga tidak berpengaruh nyata, begitu pun pada tinggi tunas didapatkan hasil yang tidak berpengaruh nyata pada perlakuan P1, P2, P3, dan P4, pada 4 MST, 8 MST dan 12 MST. Dari hasil penelitian disimpulkan dan direkomendasikan agar dalam melakukan perbanyakan tanaman secara vegetatif melalui stek pucuk untuk kualitas, agar memilih stek pucuk jambu madu dan memberi zat perangsang tumbuh bagi tanaman dengan konsentrasi Growtone 0.04 M, 40gr/100 ml air dan direndam selama 15 menit. Perlakuan terbaik untuk masing-masing parameter sebagai berikut : Perlakuan terbaik untuk persen stek hidup jambu air madu adalah 20 gr/100 ml air Perlakuan terbaik untuk jumlah tunas jambu air madu adalah 40 gr/100 ml air Perlakuan terbaik untuk tinggi tunas jambu air madu adalah 40 gr/100 ml air.
Thèses sur le sujet "Metodo 40Ar"
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MONTEMAGNI, CHIARA. « Geochronology and kinematics of crustal scale shear zones in the Himalayan collisional belt ». Doctoral thesis, Università degli Studi di Milano-Bicocca, 2020. http://hdl.handle.net/10281/269277.
Texte intégralRésumé :
L’Himalaya è classicamente considerata una catena orogenica strutturalmente cilindrica per l’impressionante continuità laterale, da ovest ad est, delle principali unità lito-tettoniche e zone di taglio, caratteristica peculiare di questa catena collisionale. L’esumazione del cuore metamorfico della catena, il Greater Himalayan Sequence (GHS), è favorita dall’attività di due zone di taglio regionali a cinematica opposta: la Main Central Thrust zone (MCTz) a cinematica compressiva e il South Tibetan Detachment System (STDS) a cinematica normale, rispettivamente alla base e al tetto del GHS stesso.
In questa tesi ho studiato l’evoluzione strutturale e geocronologica del STDS e della MCTz, con particolare focus su quest’ultima, in due transetti nell’Himalaya indiana occidentale: le valli dell’Alaknanda – Dhauli Ganga e la valle del Bhagirathi – Gangotri nella regione del Garhwal.
A questo scopo, ho adottato un approccio multidisciplinare che combina studi microstrutturali, chimici e geocronologici e stime di vorticità cinematica.
Poiché le miche sono ubiquitarie nelle zone di taglio, il metodo geocronologico 40Ar/39Ar su biotitie e muscovite è stato ampiamente utilizzato in passato e viene utilizzato tutt’oggi per vincolare l’età della deformazione per taglio.
Il metodo 40Ar/39Ar step-heating, il più adatto per questo tipo di studi, è un metodo chiave per risolvere complessità petrologiche e chimiche grazie al riconoscimento di età differenti dovute a un differente rilascio dell’Ar caratterizzato da diversi rapporti Cl/K e Ca/K. Ho applicato questo metodo, combinato con una nuova procedura, l’Ar Differential Release Plot (DRP), che permette di identificare chiaramente l’influenza della coesistenza di fillosilicati nel trend di rilascio dell’Ar durante gli step di riscaldamento, permettendo di selezionare gli step ottimali che corrispondono al degassamento delle miche in senso stretto. Questa nuova procedura permette di determinare l’età in modo molto più accurato in rocce polideformate come quelle studiate. I risultati ottenuti con il metodo 40Ar/39Ar supportano la diacronicità della MCTz e del STDS nelle aree studiate, suggerendo che i modelli di esumazione del GHS dovrebbero tener conto della mancanza di contemporaneità tra queste due strutture.
Inoltre, è stato sviluppato un nuovo approccio tridimensionale basato sulla X-ray micro Computed Tomography (microCT) e applicato per lo studio della vorticità cinematica usando il metodo dei porfiroclasti stabili. Un esame dei dati di letteratura ha dimostrato che il nostro approccio nello studio di vorticità usando il metodo dei porfiroclasti stabili non era mai stato applicato prima. Questo metodo è stato applicato a rocce provenienti dalla MCTz nella valle del Bhagirathi e i risultati suggeriscono che l’esumazione del GHS sia stata guidata da una variazione di deformazione all’interno della MCTz da un deformazione dominata da taglio semplice a cui è seguita una deformazione dominata da taglio puro, coerentemente con i dati di letteratura lungo la catena.
Riassumendo, combinando studi meso e microstrutturali con analisi chimiche e geocronologia 40Ar/39Ar, i risultati della mia tesi indicano che la MCTz e il STDS non sono coevi nei transetti studiati e che la MCTz mostra una variazione di regime deformativo durante la sua evoluzione.The Himalaya is commonly regarded as a cylindrical belt from west to east due to the impressive lateral continuity of the main litho-tectonic units and faults/shear zones, which is a peculiar feature of this mountain range. The exhumation of the metamorphic core of the belt, the Greater Himalayan Sequence (GHS), was favored by two regional scale opposite-kinematics ductile to brittle shear zones: the contractional Main Central Thrust zone (MCTz) at the bottom and the normal-sense South Tibetan Detachment System (STDS) at the top of the GHS itself. In this thesis, I investigated the structural and geochronological evolution of the STDS and the MCTz, with a particular focus on the latter, in two transects in the Indian Western Himalaya: the Alaknanda – Dhauli Ganga Valleys and the Bhagirathi – Gangotri Valley in the Garhwal region. To this aim, I used a multidisciplinary approach, which combines microstructural, chemical and geochronological studies, as well as a kinematic estimate. As micas are ubiquitous in strongly deformed shear zones, the 40Ar/39Ar geochronological method on biotite and muscovite has commonly been employed to constrain the ages of mylonitization. The 40Ar/39Ar step-heating approach, the most useful for the present study, is a key procedure to unravel petrological and chemical complexities because of the recognition of different ages due to different steps of Ar release characterized by different Cl/K and Ca/K ratios. I applied this method, combined with a new methodological approach first developed in detail during this Ph.D. thesis work, to rocks coming from the bounding shear zones of the GHS. This new procedure, named Ar Differential Release Plot (DRP), that allows to clearly identify the influence of the co-existence of phyllosilicates on the trend of Ar release during the heating steps, allowing to select the optimal steps corresponding to the degassing of micas sensu stricto, which leads to more reliable age determinations in such metamorphic polydeformed rocks. The results of 40Ar/39Ar method support the diachroneity of the MCTz and the STDS in the studied areas, suggesting that the models of exhumation of the GHS should account for their lack of contemporaneity. Moreover, a new three-dimensional approach based on the X-ray micro Computed Tomography (microCT) has been developed and applied for the study of the kinematic vorticity using the stable porphyroclasts method. A close examination of literature data shows that our study approach in the study of kinematic vorticity using the microCT has never been applied before. This method has been applied to MCTz rocks from the Bhagirathi valley and the results suggest that the exhumation of the GHS has been affected by a shift of deformation within the MCTz from simple to pure shear dominated flow, coherent with literature data all along the belt. In summary, combining meso‐ and micro‐structural studies as well as chemical analyses and 40Ar/39Ar geochronology, my thesis results points out how MCTz and STDS are not coeval in the studied structural transects and that the MCTz shows a shift in deformation regime during its evolution.
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Knezevic, David J. « Analysis and implementation of numerical methods for simulating dilute polymeric fluids ». Thesis, University of Oxford, 2008. http://ora.ox.ac.uk/objects/uuid:b54ad447-86ff-40af-a83e-022f2f0cbabb.
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In this thesis we develop, analyse and implement a number of numerical methods for simulating dilute polymeric fluids. We use a well-known model in which the polymeric fluid is represented by a suspension of dumbbells in a Newtonian solvent. This model is governed by a coupled Navier–Stokes–Fokker–Planck system of partial differential equations, in which the Fokker–Planck equation is posed on a high-dimensional domain. We first thoroughly analyse a Galerkin spectral method for the Fokker–Planck equation in configuration space, before combining this method with a finite element scheme in physical space to obtain an alternating-direction method for the high-dimensional Fokker–Planck equation. Alternating-direction methods have been considered previously in the literature for this problem, but this approach has not been subject to rigorous numerical analysis before. We develop many theoretical results for our numerical algorithms, and we focus particularly on establishing stability and convergence estimates. The numerical methods we develop are fully-practical, and we present a range of numerical results demonstrating their accuracy and efficiency. We also introduce a coupled numerical algorithm for the Navier–Stokes–Fokker–Planck system, which we use to simulate polymeric fluid flow problems of physical interest. The numerical method for the high-dimensional Fokker–Planck equation is the most computationally intensive part of this coupled algorithm, but it is well suited to implementation on a parallel computer, and we exploit this fact to make large-scale computations feasible.
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Robertson, Eleanor Rachel. « Tribal differences in the post-operative handover : a mixed-methods study ». Thesis, University of Dundee, 2017. https://discovery.dundee.ac.uk/en/studentTheses/37fc79d1-9096-40ab-a68a-f6ba00fee578.
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The provision of ultra-safe healthcare relies upon investment in robust systems of work. The transition of care between healthcare providers has been shown to contribute significant risk to patients, so much so that the improvement in handover was listed as one of the top five priorities for the World Health Organisation in 2014. Current handover practices have been evaluated in medicine using numerous techniques on the qualitative – quantitative continuum. The systematic evaluation of published literature revealed a paucity of evidence in relation to the optimal transfer of patient care. As a consequence, the post-operative handover was evaluated by first undertaking semi-structured interviews of anaesthetic, recovery and surgical staff. Differences of opinion were discovered between professional groups involved in the post-operative handover. These differences have the potential to fuel inter-professional conflict. The handover process was seen as being vulnerable to the effects of outside agencies, with time pressure being most to blame. The post-operative handover was observed and a novel handover intervention was introduced, with the primary objective of reducing multi-tasking and improving information accuracy. The intervention combined education of handover error alongside standardisation of the process. The introduction of a bed-side aide memoire to separate the transfer of equipment from standardised information transfer was introduced with staff involvement. Prior to the introduction of the handover intervention, core information points such as the patient’s name and allergies were frequently omitted and the process was often beset with distraction from concomitant activities. Both of these factors improved following the introduction of the intervention. These findings support previous revelations in handover that transitions are frequently not optimised to reduce risk in the patient pathway. However, it is feasible to ameliorate this risk by introducing a low cost quality improvement intervention which aims to standardise what can otherwise be haphazard working practice.
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Lassauniere, Alexandre. « New music technology systems and methods to assist teachers ». Thesis, University of Portsmouth, 2003. https://researchportal.port.ac.uk/portal/en/theses/new-music-technology-systems-and-methods-to-assist-teachers(33fbcff2-9cb0-40a9-a976-4812c890f2dd).html.
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This dissertation describes the creation of new music technology and information systems: electronic music interfaces, keyboard and audio networks, a novel information system called an electronic student assessment and data management system and new intelligent tutoring systems. Keyboard systems are used by music teachers. Existing systems offered a range of useful features using a number of technologies. However, they also had drawbacks, which prevented users from performing efficiently. Students had to use the new systems with portable keyboards for their lessons and were required to learn how to play the keyboard by the national curriculum. However, student's music and keyboard playing skills varied. A new intelligent tutoring system was created to overcome this problem by delivering customised tutoring on music and keyboard skills through the new systems. A broad base of research was completed and the following were the tangible research successes. The new music technology systems consisted of a network of new electronic music interfaces that could be remotely controlled from a computer using a new communication protocol. New object oriented control structures to interface with non-computer networks were defined to enable the accurate setting and display of system status, as well as management of communication-problems and abnormalities. The novel information system was a new three-tier information system created to help teachers manage students and their work. The new music technology and information systems used a new ergonomic graphical user interface. A new mobile teaching system using these systems (tablet PCs, software remote control and local station control) allowed teachers to perform their teaching anywhere. These systems were used as a test bed to implement artificial intelligence. A new habits capturer, using a new stamping method was created to anticipate user's actions from monitored activity. Also, a new computer aided instruction system to teach basic music-keyboard skills was created. This new system used the new music technology systems (through a novel interfacing method using keylighting, text-to-speech and key capturing technologies), and a new music=keyboard skills expert used as a music concept translator. The computer aided instruction system formed the base for the creation of a new intelligent computer aided instruction system (also called intelligent tutoring system) to tech basic music-keyboard skills in a custom way. This new intelligent system used a new methodology. The new methodology showed that a tutor module that gathered knowledge, expertise and assessment functions was viable. The new intelligent system also used a new generic tutoring base. Finally, a new learning curves plotter was created to display student modelling information from the new intelligent system.
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Osuala, Chima I. « Modifying Lamb/Mutton Flavors in Processed Meat Products by Smoking, Curing, Spicing, Starter Cultures and Fat Modification. Investigating the Use of the Technicon InfraAlyzer 400R as a Rapid Method for Proximate Analysis ». DigitalCommons@USU, 1985. https://digitalcommons.usu.edu/etd/5298.
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Mutton meat was tested in different products in order to obtain prototype products in which mutton can effectively be used without the objectionable mutton off flavor. Mutton flavor reduction was achieved in the processed meat products by: (a) lowering mutton fat to a level of 10% or less, (b) using spices, smoking and/or curing, (c) substituting fat from beef or pork for mutton fat, and (d) the action of microbial starter cultures. Four taste panel sessions were set up to rate these products against an all beef or all pork control for consumer acceptability. Taste panel results indicate that flavor had the greatest effect on overall acceptability of these products, compared to texture and appearance. Proximate meat analysis for fat, protein, moisture and ash were performed using the Technicon InfraAlyzer 400R and the results were compared with values obtained by reference AOAC methods. Correlation coefficients of 0.992, 0.867, 0.992 and 0.511 were obtained for fat, protein, moisture and ash respectively. The two methods were not significantly different (p = .05). These results indicate that the InfraAlyzer may be used as a rapid method for proximate analysis of fat, protein and moisture.
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O'Connell, Nicola. « Functional neurological disorder in acute stroke and mental health services : a mixed methods assessment of experiences, prevalence, associated clinical factors, and treatment ». Thesis, King's College London (University of London), 2018. https://kclpure.kcl.ac.uk/portal/en/theses/functional-neurological-disorder-in-acute-stroke-and-mental-health-services(c6f40fea-3c02-40ac-aed3-2f662107589d).html.
Texte intégralRésumé :
Functional neurological disorders (FND) present as neurological disease for which no organic cause can be found. These disorders are common, debilitating, and patients can present to a range of medical services. Little is known of the prevalence of patients with functional symptoms presenting to stroke settings, their experience once admitted to stroke wards, the demographic and clinical features of functional motor disorder (FMD) patients treated in psychiatric settings, or their response to psychological treatment. This thesis addresses this paucity of evidence. A systematic review and meta-analysis found functional stroke patients consistently present to stroke settings, constituting 1.7% (95% CI: 1.3% - 2.2%) of all patients with suspected stroke, with weakness the most commonly presenting functional symptom. A qualitative study using in-depth interviews with 14 hyper acute stroke clinicians, found participants named a range of potential causes of functional stroke presentations, but many felt unsure in how to discuss a functional diagnosis with patients. In a survey of 120 staff in hyper acute stroke wards in England, 90% of clinicians stated they do not believe there are clear guidelines on how to manage functional patients and 95.8% believed further research is necessary. A qualitative study involving interviews with 30 patients with functional stroke symptoms at one hyper acute stroke ward found many reported strong negative emotions in response to their admission and while on the ward, many believed they had had a stroke. Two months after discharge, many patients were uncertain about the cause of their admission and 40% experienced residual physical symptoms. Many expressed a desire for a more detailed explanation about the potential cause of their symptoms. A case-control study of 322 FMD patients found the disorder more commonly affects women, patients more frequently work in social or health care settings, patients often have carers or are themselves carers, and more frequently have comorbid physical and functional disorders when compared to a random sample of psychiatric patients from South London and the Maudsley NHS Trust. We found no association between experience of childhood sexual or physical abuse and an FMD diagnosis; however tentative evidence suggests patients experience precipitating events that could be defined as ‘disruptions to interpersonal relationships’. Finally, our case-control cognitive behavioural therapy (CBT) study indicates that both FMD patients and patients with organic disease respond to outpatient CBT. Half of the FMD group saw improvements in their physical symptoms, and measures of psychological distress and depression showed significant clinical improvement between first and last treatment sessions. Dropout rates from treatment were comparable between FMD and control patients. We conclude that functional disorder symptoms occur in multiple medical settings and present to newly established hyper acute stroke wards. A lack of understanding amongst clinicians about the nature of FND coupled with increasing financial pressure on the health service may serve to entrench patients’ symptoms, and worsen experiences in medical settings. Within mental health services, FMD appears to have distinct epidemiological characteristics but the fragmentation of neurological and mental health services mean patients are often under-served and lack continuity of care.
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Danillon, Didier. « The impact of client death on cancer-care psychotherapists practicing in hospices : a mixed-methods study ». Thesis, University of Manchester, 2018. https://www.research.manchester.ac.uk/portal/en/theses/the-impact-of-client-death-on-cancercare-psychotherapists-practicing-in-hospices-a-mixedmethods-study(0700cf5e-6f82-40ac-948c-00cfe4662126).html.
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Background and objective: Caring for critically-ill and dying patients is widely recognised as a central stressor in oncology and palliative-care staff. Past research in this area has mostly focused on medical staff, and the impact of patient deaths on other professionals has received only limited attention. This study aimed to explore how psychotherapists experience and cope with the death of the cancer patients in their care, and whether these experiences promote personal and/or professional growth. Methods: an exploratory sequential mixed-methods design was adopted. Participants were psychotherapists working with adult cancer- and palliative-care patients within UK hospices. In the qualitative phase, seven semi-structured interviews were conducted and examined using thematic analysis. In the quantitative phase, 28 participants completed an online questionnaire designed to evaluate the incidence within the target population of the themes identified in the qualitative phase. Findings: Grief appeared as hospice psychotherapists' main immediate response to client deaths. Participants used coping strategies aiming to facilitate emotional closure, and to foster emotional and cognitive processing. These strategies included conducting personal rituals, receiving support from colleagues and clinical supervision. Several factors hindering these coping strategies were identified, but the vast majority were shared by only a small minority of participants (e.g. feeling disenfranchised in their grief for clients). Repeated exposure to client death caused participants to feel emotionally and physically drained (and for some leading to greater fear of illness and dying). It also affected their outlook on life positively, leading to personal growth. Participants managed the negative long-term impact of their work using self-care strategies, which included working in cancer- and palliative-care settings on a part-time basis, and engaging in creative and future-oriented activities promoting a sense of hope, possibilities, and growth. Conclusion and implications: Although many hospice psychotherapists repeatedly experience grief following the deaths of their clients, most appear able to manage the immediate and long-term impacts of their work. Working in proximity to illness and death is seen as deeply challenging but at the same time as promoting personal growth, and to enhance and bring meaning to hospice psychotherapists' lives. Furthermore, the mixed-methods design adopted here provides evidence that while the qualitative methods employed produced rich data, the addition of a simple quantitative survey allowed to put these in perspective about the wider group of hospice psychotherapists. I argue that this finding supports the call, prevalent in the mixed-methods research literature, to question the segregation of qualitative and quantitative methods.
Chapitres de livres sur le sujet "Metodo 40Ar"
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Guillou, Hervé, Sébastien Nomade et Vincent Scao. « The 40K/40Ar and 40Ar/39Ar Methods ». Dans Frontiers in Earth Sciences, 73–87. Cham : Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-24982-3_5.
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Kelley, Simon, Clare Warren et Camilla Wilkinson. « Minerals, (40Ar-39Ar) ». Dans Encyclopedia of Scientific Dating Methods, 1–8. Dordrecht : Springer Netherlands, 2014. http://dx.doi.org/10.1007/978-94-007-6326-5_94-1.
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Wijbrans, Jan R. « Metamorphic Terranes (K–Ar/40Ar/39Ar) ». Dans Encyclopedia of Scientific Dating Methods, 1–8. Dordrecht : Springer Netherlands, 2013. http://dx.doi.org/10.1007/978-94-007-6326-5_44-1.
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McDougall, Ian. « Volcanogenic Sedimentary Rocks (K/Ar, 40Ar/39Ar) ». Dans Encyclopedia of Scientific Dating Methods, 950–55. Dordrecht : Springer Netherlands, 2015. http://dx.doi.org/10.1007/978-94-007-6304-3_265.
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Bachhuber, Jeff, William D. Page et Paul R. Renne. « Evaluation surface-Fault Rupture Risk to a Penstock Using the 40Ar/39Ar Dating Method ». Dans AGU Reference Shelf, 509–15. Washington, D. C. : American Geophysical Union, 2013. http://dx.doi.org/10.1029/rf004p0509.
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Hames, Willis E. « K/Ar and 40Ar/39Ar Dating Methods ». Dans Encyclopedia of Geology, 50–65. Elsevier, 2021. http://dx.doi.org/10.1016/b978-0-08-102908-4.00102-8.
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Herz, Norman, et Ervan G. Garrison. « Applications of Stable Isotopes in Archaeological Geology ». Dans Geological Methods for Archaeology. Oxford University Press, 1998. http://dx.doi.org/10.1093/oso/9780195090246.003.0020.
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Isotopic ratios of elements in natural materials on the earth either have been constant in time and space or have varied as a result of radioactive decay or geochemical fractionation. Elements which show variations in isotopic abundances in different samples and the reasons for these variations have helped resolve many geological and archaeological problems. Radioactive decay has provided absolute dating clocks: for archaeology, the most useful systems have been associated with 14C, 40Ar, and U-disequilibrium series. Variations in isotopic ratios of the stable elements H, C, O, N, S, Sr, and Pb have helped solve problems of provenance, paleoenvironments, and paleodiets. The rationale for isotopic variations of individual elements will determine the types of applications to archaeological geology. The most important applications are the determinations of artifact signatures, paleodiet, and paleoenvironment. Isotopic fractionation of light elements by physical, chemical, and biological processes is controlled by those thermodynamic properties which are determined by atomic weight and electronic configuration. Thermodynamic properties of molecules that are mass and temperature dependent include energy, which decreases with decreasing temperature, and vibrational frequency, which varies inversely in proportion to the square root of the reduced mass. Easily measurable isotopic separation is generally restricted to the lighter elements, that is, with atomic weights less than 40. Because isotopic fractionation is mass dependent, the separation is greater for elements with the greater mass difference between isotopes. The greatest separation is expected for hydrogen (mass 1) versus deuterium (mass 2); the other light elements commonly have isotopic differences closer to 10%. Thus, the lighter isotopes have higher vibrational energy and their chemical bonds are more easily broken. The different reactivity of lighter versus heavier isotopes of an element is responsible for their separation during geochemical and biological processes. Thermodynamic behavior has been considered a principal cause for variations, not in isotopic abundances of the heavier elements Sr and Pb, but rather in abundances of their parent radionuclides: Rb for Sr and U and Th for Pb. Recently, however, P. Budd and others suggested that under nonequilibrium conditions, fractionation could theoretically take place among the lead isotopes.
Actes de conférences sur le sujet "Metodo 40Ar"
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Wang, H. T., C. J. Li, G. J. Yang, C. X. Li, Q. Zhang et W. Y. Li. « Microstructural Characterization of Cold-Sprayed Nanostructured FeAl Intermetallic Compound Coating and its Ball-Milled Feedstock Powder ». Dans ITSC2007, sous la direction de B. R. Marple, M. M. Hyland, Y. C. Lau, C. J. Li, R. S. Lima et G. Montavon. ASM International, 2007. http://dx.doi.org/10.31399/asm.cp.itsc2007p0135.
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Abstract It is difficult to deposit dense intermetallic compound coatings by cold spraying directly using the compound feedstock powders due to their intrinsic low temperature brittleness. A method to prepare intermetallic compound coatings in-situ employing cold spraying was developed using a metastable alloy powder assisted with post-annealing. In this study, a nanostructured Fe/Al alloy powder was prepared by ball-milling process. The cold sprayed Fe/Al alloy coating was evolved in-situ to intermetallic compound coating through a post-annealing treatment. The microstructural evolution of the Fe-40Al powder during mechanical alloying and the effect of the post-annealing on the microstructure of the cold sprayed Fe(Al) coatings were characterized by optical microscopy, scanning electron microscopy and X-ray diffraction analysis. The results showed that the milled Fe-40Al powder exhibits lamellar microstructure. The microstructure of the as-sprayed Fe(Al) coating depends significantly on that of the as-milled powder. The annealing temperature significantly influences the in-situ evolution of the intermetallic compound. The annealing treatment at a temperature of 500oC results in the complete transformation of Fe(Al) solid solution to FeAl intermetallic compound.
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Gornaya, J., I. Selyuzhenkov et A. Taranenko. « ELLIPTIC FLOW OF π− MEASURED WITH THE EVENT PLANE METHOD IN Pb-Pb COLLISIONS AT 40A GeV ». Dans Eighteenth Lomonosov Conference on Elementary Particle Physics. WORLD SCIENTIFIC, 2019. http://dx.doi.org/10.1142/9789811202339_0044.
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