检索结果-南通市图书馆

Absorption of light in InP nanowire arrays

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Nano Research 2014年第6期7卷 816-823页

作者： nicklas Anttu Alireza Abrand Damir Asoli Magnus Heurlin Ingvar Aberg Lars Samuelson Magnus Borgstrom Division of Solid State Physics and the Nanometer Structure Consortium at Lund University (nmC@LU) Lund University Box 118 Lund 22100 Sweden Sol Voltaics AB Ideon Science Park Scheelevagen 17 Lund 22370 Sweden

An understanding of the absorption of light is essential for efficient photovoltaic and photodetection applications with III-V nanowire arrays. Here, we correlate experiments with modeling and verify experimentally the predicted absorption of light in InP nanowire arrays for varying nanowire diameter and length. We find that 2,000 nm long nanowires in a pitch of 400 nm can absorb 94% of the incident light with energy above the band gap and, as a consequence, light which in a simple ray-optics description would be travelling between the nanowires can be efficiently absorbed by the nanowires. Our measurements demonstrate that the absorption for long nanowires is limited by insertion reflection losses when light is coupled from the air top-region into the array. These reflection losses can be reduced by introducing a smaller diameter to the nanowire-part closest to the air top-region. For nanowire arrays with such a nanowire morphology modulation, we find that the absorptance increases monotonously with increasing diameter of the rest of the nanowire.

关键词： indium phosphide semiconductor nanowire absorption of light

The Rise of Private Tutoring in Denmark:An Entrepreneur's Perspectives and Experiences

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

ECNU Review of Education 2021年第3期4卷 630-639页

作者： nicklas Kany MentorDanmark

This article sheds light on the emergence of private tutoring in *** from the perspective of a tutoring entrepreneur,it discusses the challenges and opportunities faced by a fledgling tutoring company in present-day Danish *** article is a personal narrative of the author's experience with establishing the first major Danish tutoring *** enthusiastic response by parents to the services offered by the author's company shows that there has long existed a hitherto unmet need for private tutoring in ***,the author also argues that the political turmoil surrounding the 2013 Danish school reform made parents increasingly sceptical that mainstream schools could effectively address the needs of their *** thereby prepared the ground for launching a private tutoring *** is only in the last decade that private tutoring has emerged in *** article provides a unique insider's perspective on this largely unexplored development.

关键词： COVID-19 crisis Denmark MentorDanmark mentoring private tutoring

Surface-enhanced Raman scattering on dual-layer metallic gratingstructures

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Science Bulletin 2010年第24期55卷 2643-2648页

作者： GUAN ZhiQiang HAKANSON Ulf ANTTU nicklas WEI Hong XU HongQi MONTELIUS Lars XU HongXing Nanoscale Physics and Devices Laboratory Institute of Physics Chinese Academy of Sciences Beijing 100190 China Division of Solid State Physics/The Nanometer Structure Consortium Lund University Lund S-221 00 Sweden

Dual-layer Metallic grating(DMG)structures as surface-enhanced Raman scattering(SERS)substrates are studied using benzenethiol as the probe *** DMG structure consists of a SiO2 grating and 100-nm-thick gold coating *** enhancement factor of 105 is achieved by optimizing the SiO 2 grating height within the range from 165 to 550 *** enhancement factor dependence on the SiO2 grating height is due to the surface plasmon excitation,which is dependent on the polarization of the incident light,and confirmed by finite difference time domain *** study demonstrates the advantages of high uniformity,reproducibility and sensitivity in the DMG structures for SERS applications.

关键词：表面增强拉曼散射光栅结构双层金属表面增强拉曼光谱二氧化硅表面等离子体有限差分模拟增强因子

Selecting and applying quantification models for ecosystem services to forest ecosystems in South Korea

在线全文

学校读者我要写书评

暂无评论

Journal of Forestry Research 2016年第6期27卷 1373-1384页

作者： Hyun-Ah Choi Woo-Kyun Lee Cholho Song nicklas Forsell Seongwoo Jeon Joon Soon Kim So Ra Kim Department of Environmental Science and Ecological Engineering Korea University Seoul 02841 Republic of Korea Ecosystems Services and Management Program International Institute for Applied Systems AnalysisSchlossplatz 1 2361 Laxenburg Austria Department of Forest Management Kangwon National University Chuncheon 24341 Republic of Korea Korea Forest Conservation Association 186 Dongjak-daeroSeocho-gu Seoul 06559 Republic of Korea

There is growing interest in using ecosystem services to aid development of management strategies that target sustainability and enhance ecosystem support to humans. Challenges remain in the search for methods and indicators that can quantify ecosystem services using metrics that are meaningful in light of their high priorities. We developed a framework to link ecosystems to human wellbeing based on a stepwise approach. We evaluated prospective models in terms of their capacity to quantify national ecosystem services of forests. The most applicable models were subsequently used to quantify ecosystem services. The Korea Forest Research Institute model sat- isfied all criteria in its first practical use. A total of 12 key ecosystem services were identified. For our case study, we quantified four ecosystem functions, viz. water storage capacity in forest soil for water storage service, reduced suspended sediment for water purification service, reduced soil erosion for landslide prevention service, and reduced sediment yield for sediment regulation service. Water storage capacity in forest soil was estimated at 2142 t/ha, and reduced suspended sediment was estimated at 608 kg/ ha. Reduced soil erosion was estimated at 77 m^3/ha, and reduced sediment yield was estimated at 285 m^3/ha. These results were similar to those reported by previous studies. Mapped results revealed hotspots of ecosystem services around protected areas that were particularly rich in bio- diversity. In addition, the proposed framework illustrated that quantification of ecosystem services could be sup- ported by the spatial flow of ecosystem services. However, our approach did not address challenges faced when quantifying connections between ecosystem indicators and actual benefits of services described.

关键词： Classification Ecosystem services Quantification Stepwise approach

Absorption through a coupled optical resonance in a horizontal InP nanowire array

在线全文

学校读者我要写书评

暂无评论

Photonics Research 2015年第4期3卷 125-128页

作者： Ali Hosseinnia nicklas Anttu Division of Solid State Physics and The Nanometer Structure Consortium(nmC LU) Lund University

We study through electromagnetic modeling the absorption of light of a given wavelength in an array of horizontal In P nanowires of diameter less than 100 nm. Such absorption is performed most efficiently by using polarized light and by exciting a coupled optical resonance in a sparse array. In that case, we excite a resonance in the individual nanowires and couple the resonances in neighboring nanowires through a lattice resonance of the periodic *** such a resonance, an array with nanowires of 80 nm in diameter can absorb more than eight times more strongly than a tight-packed array, despite containing a seven times smaller amount of the absorbing InP material.

关键词： Absorption through a coupled optical resonance in a horizontal InP nanowire array InP

在线全文

学校读者我要写书评

暂无评论

临海圆环起波澜:格陵兰国家美术馆

中国建筑装饰装修 2011年第6期 142-147页

作者： Daniel Selensky Ji-young Yoon Gul Ertekin Aleksander Tokarz Alessio Zenaro Johan Cool nicklas Antoni rasch BIG建筑事务所

该项目是2011年格陵兰国家美术馆的中标方案，设计获得评委会的一致好评，他们认为这件作品能够激发人们的好奇心和兴趣，通过发人深省的设计使人们获得一种归属感，它将以一种动感的方式来展示国家的历史和现代艺术，它甚至可以被当成... 详细信息

该项目是2011年格陵兰国家美术馆的中标方案，设计获得评委会的一致好评，他们认为这件作品能够激发人们的好奇心和兴趣，通过发人深省的设计使人们获得一种归属感，它将以一种动感的方式来展示国家的历史和现代艺术，它甚至可以被当成一个雕塑和地标艺术来欣赏。

关键词：美术馆格陵兰圆环临海现代艺术中标方案好奇心归属感

A new method for internal cardioversion in patients with persistent atrial fibrillation

在线全文

学校读者我要写书评

暂无评论

Chinese Medical Journal 2002年第2期 139-141页

作者：周京敏 Stefan Sack Frank Heinzel Peter Hunold nicklas Dagres Raimund Erbel 葛均波 Department of Cardiology Zhongshan Hospital Shanghai Institute of Cardiovascular Diseases Fudan University Department of Cardiology University Essen Hospital Essen 45122 Germany

Comparison of Nutrient Density and Nutrient-to-Cost Between Cooked and Canned Beans

在线全文

学校读者我要写书评

暂无评论

Food and Nutrition Sciences 2011年第2期2卷 66-73页

作者： Michael Zanovec Carol E. O' Neil Theresa A. nicklas 不详

Consumption of nutrient rich foods such as beans and peas is recommended because these foods provide key nutrients and relatively little energy. Many consumers are unfamiliar with dried beans or do not have the time to prepare them. The purpose of this study was to compare nutrient density and nutrient-to-cost among dried cooked, canned (liquid and solids), and canned/drained black, garbanzo, kidney, lima, pinto, white beans, and black-eyed peas. Prices were obtained from 60 grocery stores in January 2009. Nutrient content per 100 g was calculated using the U.S. Department of Agriculture Nutrient Database for Standard Reference, Release 22, and Nutrition Data System for Research (for canned/drained). Nutrient density scores were estimated using the Nutrient Rich Food Index 9.3 (NRF9.3). Nutrient-to-cost ratio (NTCR) was computed as the NRF 9.3 score (per 100 kcal) divided by the cost per half-cup servings per package (12) or per can (3.5). Compared to canned beans, dried cooked beans were significantly more energy dense, contained more protein, fiber, iron, potassium and magnesium;and less sodium than canned beans (p < 0.05 for all). Canned/drained beans contained more sodium than cooked beans (p < 0.05). NRF9.3 scores were 7.3, 2.8, and 4.8 for cooked, canned, and canned/drained beans, respectively. NTCR for cooked, canned, and canned/drained beans was 63.4, 8.9, and 15.2, respectively. Results highlight the benefits of choosing dried beans and also illustrate that canned beans, when drained, provide a healthy alternative. Beans, regardless of type/form, are a nutrient rich food and should be encouraged as part of an overall healthy diet.

关键词： Beans Legumes Nutrient Density Nutrient Cost Food Composition

Almond Consumption Is Associated with Better Nutrient Intake, Nutrient Adequacy, and Diet Quality in Adults: National Health and Nutrition Examination Survey 2001-2010

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Food and Nutrition Sciences 2016年第7期7卷 504-515页

作者： Carol E. O’Neil Theresa A. nicklas Victor L. Fulgoni III Louisiana State University Agricultural Center Baton Rouge LA USA USDA/ARS Children’s Nutrition Research Center Department of Pediatrics Baylor College of Medicine Houston TX USA Nutrition Impact LLC Battle Creek MI USA

Purpose: The purpose of this study was to examine the association between almond consumption, the most widely consumed tree nut in the US, and nutrient intake, nutrient adequacy, diet quality, and weight/adiposity in adults. Methods: Data from adults (N=24,808), 19+ years, participating in the NHANES 2001-2010 were used. The NCI method was used to estimate the usual intake of almonds and selected nutrients. Almond consumers were defined as those consuming any amount of almonds/almond butter. Percentages of the consumers/non-consumers below the Estimated Average Requirement (EAR) or above the Adequate Intake (AI) for select nutrients were determined. To assess significant differences for the percentage of almond consumers vs. non-consumers with intakes less than the EAR or above the AI, a Z-statistic for differences in population proportions was used. Covariate-controlled linear regression was used to determine differences in diet quality, measured by the Healthy Eating Index-2010 (HEI-2010), between the consumer groups. Body mass indices and waist circumference were assessed. P was set at p < 0.01. Results: Almond consumers were more likely to be non-Hispanic white, older, of higher income, more physically active, and were less likely to be a current smoker than non-consumers. Usual intake of almonds among consumers was 29.5 ± 1.5 g/day. Usual intake of protein;dietary fiber;vitamins A, D, E, and C;thiamin;niacin;riboflavin;folate, calcium, copper, magnesium, iron, phosphorus, selenium, zinc, and potassium was higher in almond consumers. Almond consumers were less likely to be below the EAR for protein, vitamins A, D, E, B12, and C;riboflavin;calcium;copper;magnesium;iron;phosphorus;and zinc. They were also more likely to be above the AI for dietary fiber and potassium. Total HEI-2010 scores were approximately 15 points higher in almond consumers. Body mass indices and waist circumference measures were lower in almond consumers. Conclusions: Moderate consumption of

关键词： Almond Consumption Tree Nut Consumption Diet Quality Nutrients Nutrient Adequacy Adults NHANES