2,986 research outputs found
Simultaneous interplanetary scintillation and Heliospheric Imager observations of a coronal mass ejection
No full textWe describe simultaneous Interplanetary Scintillation (IPS) and STEREO Heliospheric Imager (HI) observations of a coronal mass ejection (CME) on 16 May 2007. Strong CME signatures were present throughout the IPS observation. The IPS raypath lay within the field-of-view of HI-1 on STEREO-A and comparison of the observations shows that the IPS measurements came from a region within a faint CME front observed by HI-1A. This front may represent the merging of two converging CMEs. Plane-of-sky velocity estimates based on time-height plots of the two converging CME structures were 325 kms?1 and 550 kms?1 for the leading and trailing fronts respectively. The plane-of-sky velocities determined from IPS ranged from 420 ± 10 kms?1 to 520 ± 20 kms?1. IPS results reveal the presence of micro-structure within the CME front which may represent interaction between the two separate CME events. This is the first time that it has been possible to interpret IPS observations of small-scale structure within an interplanetary CME in terms of the global structure of the event
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No full textHere is a curious book. Its title-page declares "The Artist's Book of Fables" but its pre-title-page has "Fables, Original and Selected, with a Memoir of the Author." After that title-page, it is identical with "Fables, Original and Selected" as in our copy printed by John Murray in 1833. There is again an AI at the front and an index of engravings and engravers at the back. I found that copy twenty years ago. I had found an inferior copy twenty-two years before that. At that time, I noted Aesopic fables here including "Stone Broth" and "The Mouse and the Oyster."This is a hardbound book (hard cover)James Northcote, R.A
Turbulent entrainment in a shearless mixing layer at the edge of a cloud
No full textThree-dimensional direct numerical simulations which combine the Eulerian description of temperature, vapor content and velocity with a Lagrangian ensemble of cloud water droplets are used to study the turbulent entrainment and subsequent mixing of clear air with a cloudy air filament. The study is conducted in a shearless mixing layer setup which is adjusted to realistic conditions at a cumulus cloud boundary. The magnitude of turbulent velocity fluctuations in- and outside the cloud can be varied independently. We find that the evolution of the cloud water droplet ensemble depends slightly only on the contrast of turbulent velocity fluctuations in- and outside the cloud filament. The buoyancy feedback on the flow via the evaporating droplets causes a transient amplification of all fluctuations before the turbulence eventually decays. We study the evolution of the probability density functions of droplet size as well as of supersaturation, temperature and vorticity at the droplet positions
Flyleaf of The Village Politicians, signed by author and publisher R.A. Parsons, and printed by Guardian Ltd.
No full textNewIntroduction. Flyleaf of the The Village Politicans by R.A. Parsons and printed by Guardian Ltd.DA vol. 15 no.
Non-Linear Time Series Analysis of Deep Groundwater Levels: An application to the Veluwe
No full textThe objective of this study is to improve the simulation of deep groundwater levels by time se- ries models with pre-defined impulse response functions. This is attempted by adding a conceptual non-linear root zone model to simulate the recharge series to the model and by testing the use of a separate response function for the percolation zone. Three root zone models are developed based on two different recharge mechanisms: preferential flow, percolation, and a combination of the two. The performance of these models is compared to a linear model that is commonly used in time se- ries models to simulate the recharge. The approach is applied to groundwater level measurements in the Veluwe, a largely forested area in the Netherlands characterized by thick unsaturated zones. The effect of groundwater extractions and land reclamations is added to the model to further im- prove the simulation of the groundwater levels. The models are tested on three observations wells with increasing thickness of the unsaturated zone, varying from 7 m to 29 m to 49 m. The results show that model performance is improved by the implementation of a non-linear root zone model, particularly in simulating the peaks and lows in the groundwater levels. The recharge fluxes simulated by the non-linear models show different patterns that are physically more realistic than those simulated by the linear model. It is shown that different recharge series result in simulated groundwater levels that are very similar. This is a clear example of equifinality and it is recommended to introduce new sources of information to validate the modelled processes (e.g., water content measurements of the percolation zone or actual evaporation data). For the shallow well, the models with a single response function are selected as the best. The largest improvements for the deeper groundwater levels are obtained by the addition of a separate response for the percolation zone. For example, the average deviation from the observed ground- water levels decreased 0.18 m to 0.08 m for the deepest observation well by applying the separate response function. The models with an additional response function were better at simulating the estimated time to peak, the time it takes a recharge pulse to cause a peak in the groundwater levels. The time to peak is introduced in this research as a qualitative indicator to validate the modelled processes. The simulated responses indicate that the groundwater levels respond very quickly to water that leaves the root zone, even though the percolation zone is tens of metres thick. For each of the observations wells it is investigated if adding the effect of groundwater extrac- tions or land reclamations of Flevoland to the models improves the simulation of the groundwater levels. For the shallow well it is concluded that either the effect of land reclamations or groundwater extractions needs to be taken into account. Since these two stresses are correlated, it is concluded that only one of these should be taken into account when no further information is available to con- strain the models. For the medium deep well, the additional stresses did not significantly improve model performance and it is concluded that they do not have to be taken into account for this well. For the deep well, model performance is improved by both stresses. The largest improvements are observed when the effect of groundwater extractions is considered in the model. For implemen- tation of these stresses, the entire simulation period should be used for calibration, or constraints have to be implemented to obtain realistic results.Water ResourcesWater ManagementCivil Engineering and Geoscience
Chemicals from renewable biomass: A renaissance in carbohydrate chemistry
No full textThe conversion of sugars, derived from waste polysaccharide biomass, to commodity chemicals by fermentation or catalytic hydrogenation, oxidation or dehydration or combinations thereof are reviewed.Accepted Author ManuscriptBT/Biocatalysi
KONSEP HARKAT DAN MARTABAT PEREMPUAN DALAM BUKU HABIS GELAP TERBITLAH TERANG KARYA R.A KARTINI DAN RELEVANSINYA TERHADAP PENDIDIKAN ISLAM
No full textThe background of this research originated from the admiration of the author of the book Habis Gelap Terbitlah Terang by R.A. Kartini who has an extraordinary spirit in fighting for the dignity of women. Women who are not valued, are not recognized, and do no have the opportunity to develop themselves during the R.A. Kartini, now has freedom. His dignity and recognition are recognized by the community. But along with the development of the era that was so extraordinary. Book Habis Gelap Terbitlah Terang began to be forgotten by the people. This research included qualitative research and the type of research that the authors do is library research. The research approach used is the historical approach. The method of data collection in this study is adjusted to the type of research conducted, namely the research library, then the right data collection method is the collection and documentation method. Data analysis in this study uses content analysis method. Based on the results of research conducted by the author about the concept of the dignity of women in view of R.A. Kartini can be concluded that the concept of the dignity of women in the view of R.A. Kartini has seven concepts: educated women, virtuous women, skilled women, free women who are civilized and educated, men collaborate with women, women who are knowledgeable about religion, and delete the caste system in society. The seven concepts have a close relationship to Islamic education which is focused on the goal of Islamic education, namely facilitates women to develop themselves, both in the realm of individuals, families, social and in work so that we create human being.Latar belakang penelitian ini berawal dari kekaguman penulis pada buku Habis Gelap Terbitlah Terang karya R.A. Kartini yang memiliki semangat luar biasa dalam memperjuangkan harkat dan martabat perempuan. Perempuan yang tidak dihargai, tidak diakui, dan tidak memiliki kesempatan untuk mengembangkan diri pada masa R.A. Kartini, kini telah memiliki kebebasan. Harkat dan martabatnya terakui oleh masyarakat. Namun seiring perkembangan zaman yang begitu luar biasa. Buku Habis Gelap Terbitlah Terang ini mulai terlupakan oleh masyarakat. Penelitian ini termasuk penelitian kualitatif dan jenis penelitian yang penulis lakukan merupakan penelitian kepustakaan (library research). Pendekatan penelitian yang digunakan yaitu pendekatan sejarah (histori). Metode pengumpulan data dalam penelitian ini disesuaikan dengen jenis penelitian yang dilakukan, yaitu library research maka metode pengumpulan data yang tepat adalah metode pengumpulan dan dokumentasi. Analisis data pada penelitian ini menggunakan metode content analysis. Berdasarkan hasil penelitian yang dilakukan oleh penulis tentang konsep harkat dan martabat perempuan dalam pandangan R.A. Kartini dapat disimpulkan bahwa konsep harkat dan martabat perempuan dalam pandangan R.A. Kartini ada tujuh konsep yaitu: perempuan berpendidikan, perempuan berbudi luhur, perempuan berketerampilan, perempuan bebas yang beradab dan terpelajar, laki-laki bekerjasama dengan perempuan, perempuan yang berpengetahuan ilmu agama, serta menghapus sistem kasta di masyarakat. Ketujuh konsep tersebut memiliki hubungan yang erat terhadap pendidikan Islam yang difokuskan pada tujuan pendidikan Islam yaitu memfasilitasi perempuan untuk mengembangkan diri, baik dalam ranah individu, keluarga, sosial dan dalam berkarya sehingga terciptalah insan kamil
A Review of Some Updates in the 13th Edition of “Sears and Zemansky’s University Physics with Modern Physics” (Authors: Hugh D. Young and Roger A. Freedman; contributing author, A. Lewis Ford; 2012)
No full textYoung, H.D.; and Freedman, R.A.; Ford, A.L. (contributing author). 2012. Sears and Zemansky’s University Physics with Modern Physics. 13th ed.Pearson Education, Inc., Addison-Wesley, San Francisco, CA, USA
A dynamic and stochastic analysis of fertilizer use in swidden agriculture
No full textThe number of times a crop can be harvested on a cleared parcel of forest land (CPFL) before this land must be fallowed is dependent on the decision to use or not to use fertilizers to enhance soil fertility. As such, we first construct a theoretical model of fertilizer use by a swidden cultivator when this cultivator can choose whether or not to enhance soil fertility by using fertilizers. Second, we analyze two different policies (fertilizer use and no fertilizer use) for overseeing the problem of soil fertility deterioration on the CPFL. Finally, we identify a particular likelihood function and we show that whether the problem of soil fertility impairment is best addressed with a fertilizer use policy or with a no fertilizer use policy depends essentially on this likelihood function.
An international growth strategy for a fast-growing last mile delivery planning company
No full textPlotwise is a tech scale-up that offers continuous planning for last mile delivery. By providing data-driven AI planning software as a service, the company strives to improve the delivery planning process of its customers and thereby allowing them to handle the growth in demand for home delivery. The home delivery market is expanding at an exponential rate. The COVID-19 pandemic has pushed the e-commerce market five years ahead, more packages are delivered every day and this volume is rapidly growing. Online shoppers are reshaping the delivery economy from supply- to demand-driven. They expect their deliveries to be free, fast and convenient. At the same time, logistics operators and (online) retailers strive to find the optimal balance between costs, operational efficiency and customer experience. Improving environmental performance is getting increasingly important as well. This puts significant stress on their planning and delivery process. Plotwise seems successful in terms of its product-market fit. Hence, the management team wants to rapidly scale the company through signing new customers in at least four additional European countries between now and 2022. For this reason, the Head of Sales of Plotwise asked the author of this thesis to design a sales strategy that guides the company in entering European countries with its current product. The author created this sales strategy through performing a literature review, an internal analysis, an external analysis and quantitative market research. Strategic design principles complemented these research methodologies. This thesis presents the results of this research. In the literature review, the author discusses theoretic elements of traditional market entry strategy literature. The review synthesises the findings into a model that guided the development of the sales strategy. An internal analysis on Plotwise’s vision, mission, product, business model and culture shows that the company is fit for international expansion. However, the analysis shows that the sales team faces several challenges that possibly slow down this scaling. To tackle the identified challenges, the author presents three sales tools in combination with a roadmap for 2021 and 2022. The expectation is that these tools will improve the lead conversion, thereby increasing the number of signed customers. The author created a market analysis framework to conduct a quantitative market study. The result of this analysis is a list of most attractive countries to enter; the advice is to enter the UK market first, followed by Sweden, Norway and France. This advice deviates from an initial assumption on entry sequence as made by the management team of Plotwise. Additionally, the author advises to focus on logistic service providers (LSP), third party logistics (3PL) companies, electronics e-tailers, brands and (online) grocery stores as first customer segments. Lastly, the author advises Plotwise to position as “future-proof planning partner for delivery service optimisation”. This positioning resonates with online shopper behaviour and differs from the competition. Moreover, it leverages the core competencies of Plotwise.Strategic Product Desig
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