169,890 research outputs found
Kesan luluhawa terhadap kekuatan ricih syal lempung dalam penentuan parameter kestabilan cerun
No full textSyal lempung dalam keadaan semula jadi merupakan batuan lempung yang memiliki kekuatan ricih yang tinggi. Syal lempung yang terdedah kepada atmosfera dan hidrosfera menyebabkan kekuatan ricih berkurang dengan ketara. Perkara ini menyebabkan banyak kegagalan cerun berlaku di tanah syal lempung yang mana kaedah piawai untuk permasalahan tersebut masih belum ada. Oleh itu, kajian ini bertujuan menyiasat pengaruh luluhawa terhadap indeks dan ciri-ciri fizikal syal lempung serta penurunan kekuatan ricih puncak dan kekuatan ricih baki. Kajian ini juga bertujuan membangunkan kaedah yang tepat untuk menentukan dan mengaplikasikan parameter kekuatan ricih yang masih belum ada untuk permasalahan kestabilan cerun syal lempung. Pengambilan sampel tak terganggu syal lempung diperolehi daripada ujian galian dengan menggunakan acuan teras terbelah yang belum pernah digunakan. Sampel diuji di makmal untuk menentukan kekuatan ricih baki dan kemudiannya digunakan untuk menilai keadaan kes cerun di tapak pembinaan. Dua jenis hasil ujian ialah kekuatan ricih baki tanpa pelepasan tegasan dan kekuatan ricih baki dengan pelepasan tegasan. Pada kes cerun yang belum berlaku kegagalan, analisis kestabilan cerun menggunakan parameter kekuatan ricih yang sudah dipengaruhi luluhawa memberikan kejelekitan (c) antara 31% hingga 49%, manakala sudut geseran dalam (f) adalah antara 81% hingga 98% daripada keadaan semulajadi. Manakala pada kes cerun yang telah berlaku kegagalan, akan tetapi tidak berlaku penggalian, analisis kestabilan cerun yang menggunakan kekuatan ricih baki tanpa pelepasan tegasan memberikan hasil dengan kejelekitan baki (crp) adalah 21% hingga 28% dari kejelekitan puncak dan sudut geseran dalam (frp) adalah 32% hingga 45% dari sudut geseran dalam puncaknya. Pada kes cerun yang telah berlaku kegagalan, tetapi berlaku penggalian serta penimbunan semula, analisis kestabilan cerun menggunakan kekuatan ricih baki dengan pelepasan tegasan, kejelekitan baki (crf) adalah 2% hingga 9% dari kejelekitan puncak dan sudut geseran dalam (frf) adalah 19% hingga 24% dari sudut geseran dalam puncaknya. Hasil ujian kekuatan ricih baki yang diperolehi di makmal disahkan dengan penentuan kekuatan ricih baki yang berlaku pada kes kegagalan cerun di jalan tol Semarang Bawen STA 19+250. Analisis balik dengan kaedah elemen terhingga (FEM) dan kaedah had keseimbangan (LEM) telah mengesahkan bahawa ujian kekuatan ricih baki yang diperoleh di makmal dengan kaedah yang disyorkan telah membuktikan hasil yang cemerlang. Kajian ini mencadangkan ujian kekuatan ricih melalui proses luluhawa di makmal adalah sesuai untuk kejuruteraan rekabentuk rancangan kestabilan cerun pada tanah syal lempung di masa hadapan
Le temps des Syal : Techniques, vivres et territoires
No full textSAD CT1 "avec la collaboration de Bernadette Leclerc" http://gis-syal.agropolis.fr/Certains systèmes agroalimentaires localisés (Syal) semblent tout à la fois constituer une réponse à la vague de mondialisation et ouvrir des pistes pour affronter les enjeux d'un développement (plus) durable. Ils participent en effet à une dynamique socio-économique locale, valorisent des ressources naturelles tout en les préservant, ou offrent des produits ayant une forte « densité culturelle ». Mais d’où les Syal tiennent-ils ces propriétés ? Vaste question que cet ouvrage explore sous l’angle original des relations entre le changement technique et l’ancrage territorial des activités productives.De la mise en valeur de la race bovine d’Aubrac dans les années 1960 jusqu’au questionnement des modèles techniques de production de légumes dans les Pyrénées-Orientales, en passant par la relance du safran dans le Quercy, la qualification des fromages corses ou du fromage de Cotija des rancheros mexicains, les auteurs analysent de multiples expériences qui dessinent les voies de futurs possibles. Cet ouvrage s’adresse à un public de chercheurs et d’enseignants aussi bien que de responsables politiques ou associatifs, d’animateurs territoriaux et de praticiens du développement
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Le temps des Syal : Techniques, vivres et territoires
No full textSAD CT1 "avec la collaboration de Bernadette Leclerc" http://gis-syal.agropolis.fr/Certains systèmes agroalimentaires localisés (Syal) semblent tout à la fois constituer une réponse à la vague de mondialisation et ouvrir des pistes pour affronter les enjeux d'un développement (plus) durable. Ils participent en effet à une dynamique socio-économique locale, valorisent des ressources naturelles tout en les préservant, ou offrent des produits ayant une forte « densité culturelle ». Mais d’où les Syal tiennent-ils ces propriétés ? Vaste question que cet ouvrage explore sous l’angle original des relations entre le changement technique et l’ancrage territorial des activités productives.De la mise en valeur de la race bovine d’Aubrac dans les années 1960 jusqu’au questionnement des modèles techniques de production de légumes dans les Pyrénées-Orientales, en passant par la relance du safran dans le Quercy, la qualification des fromages corses ou du fromage de Cotija des rancheros mexicains, les auteurs analysent de multiples expériences qui dessinent les voies de futurs possibles. Cet ouvrage s’adresse à un public de chercheurs et d’enseignants aussi bien que de responsables politiques ou associatifs, d’animateurs territoriaux et de praticiens du développement
Mitomycin C in highly myopic eyes - Author reply
No full textOphthalmology. 2005 Feb;112(2):208-18; discussion 219.
Mitomycin C modulation of corneal wound healing after photorefractive keratectomy in highly myopic eyes.
Gambato C, Ghirlando A, Moretto E, Busato F, Midena E.
SourceRefractive Surgery Service and Antimetabolite Therapy Research Unit, Department of Ophthalmology, University of Padova, Padova, Italy.
Abstract
PURPOSE: To evaluate the role of topical mitomycin C in corneal wound healing (CWH) after photorefractive keratectomy (PRK) in highly myopic eyes.
DESIGN: Prospective, double-masked, randomized clinical trial.
PARTICIPANTS: Seventy-two eyes of 36 patients affected by high (>7 diopters) myopia.
METHODS: In each patient, one eye was randomly assigned to PRK with intraoperative topical 0.02% mitomycin C application, and the fellow eye was treated with a placebo. Postoperatively, mitomycin C-treated eyes received artificial tears (3 times daily, tapered in 3 months), whereas the fellow eye was treated with fluorometholone sodium 2% and artificial tears (3 times daily, tapered in 3 months).
MAIN OUTCOME MEASURES: Uncorrected visual acuity (UCVA) and best-corrected visual acuity (BCVA), contrast sensitivity, manifest refraction, and biomicroscopy. Contrast sensitivity was determined using the Pelli-Robson chart. Corneal confocal microscopy documented CWH.
RESULTS: Mean follow-up was 18 months (range, 12-36). No side effects or toxic effects were documented. At 12-month follow-up examination, UCVAs (logarithm of the minimum angle of resolution) were 0.4+/-0.48 and 0.5+/-0.53 (P = .03) in mitomycin C-treated eyes and corticosteroid-treated eyes, respectively. At 1 year, corneal haze developed in 20% of corticosteroid-treated eyes, versus 0% of mitomycin C-treated eyes. At 12, 24, and 36 months, corneal confocal microscopy showed activated keratocytes and extracellular matrix significantly more evident in untreated eyes (Ps = 0.004, 0.024, and 0.046, respectively).
CONCLUSION: Topical intraoperative application of 0.02% mitomycin C can reduce haze formation in highly myopic eyes undergoing PRK.
Comment in
Ophthalmology. 2006 Feb;113(2):357; author reply 357-8
Dispelling the Myths Behind First-author Citation Counts
No full textWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
A Multi-Language Comparison of Influences on Author Verification using Character N-Grams
No full textWe create a new multi-language corpus for author verification based on Wikipedia talkpages, and evaluate the influence that differences in topic and time have on character n-gram author profiles. Topic alignment between two texts is found to increase author verification precision, and an authors writing style is found to change over time, but not more significantly after 3 years than after 1 year.Information ArchitectureWISElectrical Engineering, Mathematics and Computer Scienc
A 0.12mm<sup>2</sup> Wien-Bridge Temperature Sensor with 0.1°C (3σ) Inaccuracy from -40°C to 180°C
No full text Resistor-based temperature sensors can achieve much higher resolution and energy efficiency than conventional BJT-based sensors [1], but they typically occupy more area (> 0.25 mm 2 ) and have lower operating temperatures (le 125 {circ} {C}) [2]-[4]. This work describes a 0.12mm 2 resistor-based sensor that uses a Wien-bridge (WB) filter to achieve 0.1 {circ} {C} (3 sigma) inaccuracy from - 40 {circ} {C} to 180 {circ} {C}. Compared to a state-of-the-art WB sensor [4], it occupies 6 × less area and achieves comparable relative accuracy over a 76% wider operating range. Session 10.3 Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Electronic InstrumentationMicroelectronic
A ±25A Versatile Shunt-Based Current Sensor with 10kHz Bandwidth and ±0.25% Gain Error from -40°C to 85°C Using 2-Current Calibration
No full textAccurate current sensing is critical in many industrial applications, such as battery management and motor control. Precise shunt-based current sensors have been reported with gain errors of less than 1% over the industrial temperature range (-40°C to 85°C) [1]–[4]. However, since they are intended for coulomb counting, their bandwidth is limited to a few tens of Hz, making them unsuitable for battery impedance or motor-current sensing. This paper presents a current sensor with a wide (10kHz) bandwidth and a tunable temperature compensation scheme (TCS), which allows it to be flexibly used with different types of shunts while maintaining high accuracy. A low-cost room-temperature calibration scheme is proposed to optimize gain flatness over temperature by exploiting the shunt's self-heating at large currents. Over the industrial temperature range and a ±25A current range, it achieves state-of-the-art gain error (±0.25%) with both low-cost PCB and stable metal-alloy shunts.Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Electronic InstrumentationMicroelectronic
An Article About Albertus C. Van Raalte, Author Unknown, Except for Parts Taken from an Article by Anna C. Post
No full textAn article about Albertus C. Van Raalte, author unknown, except for parts taken from an article by Anna C. Post. The author knew first generation persons in the Holland settlement and therefore, the article has some value.https://digitalcommons.hope.edu/vrp_1890s/1012/thumbnail.jp
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