253 research outputs found
Convex functions on Grassmannian manifolds and Lawson–Osserman problem
No full textAbstractWe derive estimates of the Hessian of two smooth functions defined on Grassmannian manifold. Based on it, we can derive curvature estimates for minimal submanifolds in Euclidean space via Gauss map as in [Y.L. Xin, Ling Yang, Curvature estimates for minimal submanifolds of higher codimension, arXiv: 0709.3686; 24]. In this way, the result for Bernstein type theorem done by Jost and the first author could be improved
Proceeding of the consultans group discussion on the resistance to soil-borne diseases of legumes
No full textvii+167hlm.;28c
Sustainable agriculture: future hope for developing countries
No full textAided by a political resolve, the dedication of their scientists, and strong international support, many developing
countries made remarkable progress in achieving self-sufficiency in food and natural fiber during the last two decades.
However, increasing population and commercialization of agriculture in these countries have put enormous pressure on the
resources needed for a sustained growth in agricultural production. Limited arable lands are being overexploited reducing their
productivity. Erosion-prone marginal lands are being brought under cultivation. Faulty irrigation practices, coupled with poor
drainage, have made many areas less productive than before. Several time-tested stable cropping systems have been given up in
favor of new, unstable systems to obtain higher yields per unit area. Indiscriminate use of fertilizers and pesticides has led to serious
unforeseen problems adversely affecting the stability of crops. In spite of these setbacks, there is hope of achieving sustainable
growth in agricultural production. This can be done by improving land and water management practices; discovering stable,
high-productivity farming systems including crops and livestock; evolving better, environment-friendly crop health management
practices', using new biotechnology tools; supporting international agricultural research centers sponsored by the Consultative
Group for International Agricultural Research; involving nongovernmental organizations and government agencies in efforts to
educate and support farmers; and most important of all, implementing innovative programs to reduce population growth rates with
the total commitment of the concerned governments
Exploring fine sediment dynamics and the uncertainties associated with sediment fingerprinting in the Nene river basin, UK
No full textTo comply with the European Union Water Framework Directive (2000), National Governments are required to achieve good chemical and ecological status of freshwater bodies. Fine sediment has been shown to be a major cause of the degradation of lakes and rivers, and as a result research in geomorphology has been directed towards the understanding of fine sediment dynamics. It was identified by a review of published literature that at present a paucity of information on sediment dynamics existed for the East Midlands, UK. The use of tracers within a sediment fingerprinting framework has recently become a heavily used technique to investigate the sources of fine sediment pressures. However, uncertainties associated with tracer behaviour have been cited as major potential limitations to sediment fingerprinting methodologies. At present few studies have quantified the uncertainties associated with tracer use, or the exact reasons why different tracers are producing different sediment provenance results. This thesis had two aims based on these gaps in published literature. First, to assess the impact of sediment sampling methodology, tracer selection, particle size corrections and organic enrichment corrections on a fine sediment fingerprinting study. Secondly, to develop a partial sediment budget for the Upper Nene river basin and its major tributaries. The results of this thesis were presented in two parts. The first part investigated Aim 1 when fingerprinting; historically deposited sediment, suspended sediment and recently deposited sediment. The second part investigated Aim 2 by constructing a fine sediment budget for the Nene river basin, consisting of; sediment yield, sediment provenance, floodplain sediment accumulation and channel bed sediment storage. A mean difference of 24.1% between the predicted contributions of sediment originating from channel banks was found when using nine different tracer groups to fingerprint the river sediment samples. When fingerprinting contributions from urban street dusts mean differences between tracer group predictions were lower, at between 8% and 11%. There was little indication that organic matter content and / or particle size caused differences between tracer group predictions. Within-source variability in tracer concentrations, and small contrasts between the tracer concentrations of the sediment source groups, were identified as probable causes of inherent uncertainty present in the fingerprinting analysis. It was determined that the ratio of the percentage difference between median tracer concentrations in the source groups and the average within-source tracer concentration coefficient of variation could indicate the likely uncertainty in model predictions prior to tracer use. When fingerprinting historically deposited sediment, a reservoir core was fingerprinted with the least uncertainty, with tracer group provenance predictions ~28% apart and with consistent down-core trends. When fingerprinting an on-line lake core and four floodplain cores, differences between tracer group predictions were as large as 100%; the down-core trends in changing sediment provenance were also different. The differences between tracer group predictions could be attributed to the organic matter content and particle size of the sediment. There was also evidence of the in-growth of bacterially derived magnetite and chemical dissolution affecting the preservation of tracer signatures. Despite the prior indications that organic matter and particle size were causing tracer non-conservatism in historical sediment cores, data corrections were found to often be ineffective at reducing the differences between tracer group predictions. The corrections were found to either have no effect on, or increase the mean differences between, tracer group predictions when fingerprinting river sediment. The sediment budget identified that the annual sediment yield of 13 - 19 t km-2 yr-1 for the Nene is low in comparison to other UK catchments. Channel banks were found to be the dominant sediment source in the Nene, typically contributing between 60% and 100% of the sediment. Rates of sediment accumulation on the Nene’s floodplain was found to be highly variable (920– 7,200 t km-2 yr-1); the presence of flood defences were likely to be a cause of this variability, and have caused a reduction in the accumulation rate since 1963. It was found that large quantities of sediment accumulated on channel beds during periods of low flows (~ 28% of the annual sediment yield), which was flushed from the bed by a series of flood events (leavin
Correction to: A Siamese transformer network for zero-shot ancient coin classification (Journal of Imaging, (2023), 9, 6, (107)
No full textJochen Büttner was not included as an author in the original publication [1]. The corrected Author Contributions statement appears here. Author Contributions: Conceptualization, J.B. (Siamese structure), Z.G. and O.A. (transformer components); methodology, Z.G., O.A. and Y.L.; software, Z.G. and Y.L.; investigation, Z.G. and D.R.; resources, Z.G. and O.A.; data curation, O.A.; writing—original draft preparation, Z.G., O.A., D.R. and Y.L.; writing—review and editing, Z.G. and O.A.; visualization, Z.G.; supervision, O.A.; project administration, O.A.; after initial publication, J.B. has agreed to be added as a co-author. All authors have read and agreed to the published version of the manuscript. The authors state that the scientific conclusions are unaffected. This correction was approved by the Academic Editor. The original publication has also been updated.</p
Author Correction: Differential epigenetic reprogramming in response to specific endocrine therapies promotes cholesterol biosynthesis and cellular invasion
No full textThis Article omits a declaration from the Competing Interests statement, which should have included the following: ‘One of the authors, Y.L., is an editor on the staff of Nature Communications, but was not in any way involved in the journal review process. The other authors declare no competing interests.’ Also, the Article contains an error in the name of the author Alba Rodriguez-Meira, which is incorrectly given as Alba Meira. These errors have not been corrected in either the PDF or HTML versions of the Article. © 2019, The Author(s)
An Investigation into the Authenticity of the Bi-Lin-Lang-Guan Version of Jin Lu-Xiang’s Shang Shu Zhu
No full text金履祥為宋、元之際經學大家，據載金氏關於《尚書》的作品有《尚書表注》一卷、《尚書注》十二卷，又嘗以《尚書》為主，旁採經子諸說，作《通鑑前編》十二卷。近人蔡根祥曾考證其十二卷《尚書注》，當是由《通鑑前編》中將關於《尚書》部份的文字輯出而成，乃後人偽作。不過，事實上今日傳世的金履祥《尚書注》有兩種版本，一為陸心源《十萬卷樓叢書》本，此為流行本，一本則收入清人方功惠《碧琳琅館叢書》當中。兩書內容完全不同，然大部份學者均未詳加分別，以為同本。本文試圖就此一發現發現，由既有文獻資料，整理關於金履祥《尚書注》的歷來著作情形，並對《碧琳琅館叢書》本《金氏尚書注》內容作詳細的探討。經研究後，發現此書的思想、內容均與金履祥時代不合，再進一步考察，得知此本亦是偽作，為後人取元人陳師凱《書蔡傳旁通》為主，並用及相關資料作為〈序〉、〈跋〉、〈附錄〉拼湊而成，當是清代中葉之後的人所偽作。Jin Lu-Xiang is an important scholar in the Sung and the Yuan Dynasties. Allegedly, he is the author of Shang Shu Biao Zhu (Commentaries on the Chronicle in Shang Shu), Shang Shu Zhu (Commentaries on Shang Shu), and Zi Zhi Tong Jian Qian Bian (The History before Zi Zhi Tong Jian). Recently, Tsai Ken-Hsian has found out that Shang Shu Zhu is a fake: it is actually a part of Zi Zhi Tong Jian Qian Bian.
We currently have 2 versions of Jin’s Shang Shu Zhu, one of which is in Lu Xin-Yuan’s Shi-Wan-Juan-Lou Series and the other one is in Fang Gong-Hui’s Bi-Ling-Lang-Guan Series. These 2 versions are totally different, but few scholars have discovered this fact.
With a detailed investigation into all the documents related to Jin’s writing process of Shang Shu Zhu, this study proves that the Bi-Ling-Lang-Guan version is also a fake, because the thoughts that it includes do not exist in Jin’s time. This version is actually Chen Shi-Kai’s Shu Tsai Zhuan Pang Tong in the Yuan Dynasty, combined with related information as its preface, postscript, and appendix. It has been fabricated in the middle period of the Qing Dynasty
Indian Prime Minister's Visit to ICRISAT Center 29 Aug 1992
No full textThe Prime Minister arrived at ICRISAT Center by helicopter. Upon alighting in the cricket field, he was received by Professor Eric H. Roberts, Chairman, ICRISAT
Governing Board. Professor V.L. Chopra, Director General, Indian Council of Agricultural Research, and Vice Chairman of the Board, introduced Professor Roberts to the Prime Minister. Mr Balram jakhar, Honorable Union Minister for Agriculture, and Mr Janardhan Reddy, Chief Minister of Andhra Pradesh, accompanied Mr Rao. After being introduced to the Prime Minister, Director General James G. Ryan presented h im w i t h a handwoven scarf featuring the ICRISAT logo.
Mr Rao was thenintroduced to the Members of the Governing Board and ICRISAT's Administration. Clockwise from above right: Dr William T. Mashler, outgoing Chairman of the Governing Board; Dr Roberta H. Smith (Mr M. Zaki Azam and Dr M.S. Gill are also visible); Dr Stein W. Bie; Dr Y.L. Nene, Deputy Director General; and Dr P.V. Shenoi, Assistant Director General (Liaison)
A single-photon ECAT reconstruction procedure based on a PSF model
No full textElectrical Engineering, Mathematics and Computer Scienc
Not Available
No full textNot AvailableInfluence of cropping systems on Macrophomina phaseolina population of SoilNot Availabl
- …
