检索结果-南通市图书馆

Agricultural adaptation to climate change in China

在线全文

学校读者我要写书评

暂无评论

Journal of environmental Sciences 2001年第2期13卷 192-197页

作者： YOU Song\|cai(Tokyo Institute of Technology, Japan. e\|mail:you.songcai@nies.go.jp) Tokyo Institute of Technology 日本

This paper presents the study on agriculture adaptation to climate change by adopting the assumed land use change strategy to resist the water shortage and to build the capacity to adapt the expected climate change in the northern China. The cost\|benefit analysis result shows that assumed land use change from high water consuming rice cultivation to other crops is very effective. Over 7 billions m 3 of water can be saved. Potential conflicts between different social interest groups, different regions, demand and supply, and present and future interests have been analyzed for to form a policy to implement the adaptation strategy. Trade, usually taken as one of adaptation strategies, was suggested as a policy option for to support land use change, which not only meets the consumption demand, but also, in terms of resources, imports water resources.

关键词： agriculture adaptation climate change land use change

Impact on dietary intake of a self-directed, gender-tailored diabetes prevention program in men

在线全文

学校读者我要写书评

暂无评论

World Journal of Diabetes 2017年第8期8卷 414-421页

作者： Megan e Rollo elroy J Aguiar Kirrilly M Pursey Philip J Morgan Ronald C Plotnikoff Myles D Young Clare e Collins Robin Callister Priority Research Centre for Physical Activity and Nutrition School of Health Sciences Faculty of Health and Medicine University of Newcastle Callaghan Department of Kinesiology School of Public Health and Health Sciences University of Massachusetts Amherst Priority Research Centre for Physical Activity and Nutrition School of Education Faculty of Education and Arts University of Newcastle Priority Research Centre for Physical Activity and Nutrition School of Biomedical Sciences and Pharmacy Faculty of Health and Medicine University of Newcastle

AIMTo investigate changes in dietary intake following a 6-mo randomised controlled trial of the self-directed, gender-tailored type 2 diabetes mellitus (T2DM) Prevention Using LifeStyle education (PULSe) program in men. MeTHODSMen aged 18-65 years, with a body mass index (BMI) 25-40 kg/m2, and at high risk for developing T2DM were recruited from the Hunter Region of New South Wales, Australia. eligible participants were randomised into one of two groups: (1) waitlist control; or (2) PULSe intervention. Dietary intake was assessed at baseline and immediately post-program using the Australian eating Survey food frequency questionnaire and diet quality measured using the Australian Recommended Food Score (ARFS). ReSULTSOne hundred and one participants (n = 48, control; n = 53, intervention, mean age 52.3 ± 9.7 years, BMI of 32.6 ± 3.3 kg/m2) commenced the study. Following the active phase, differences between groups were observed for proportion of total energy consumed from healthful (core) foods (+7.6%eI, P energy-dense, nutrient-poor foods (-7.6%eI, P et quality (ARFS) (+4.3, P = 0.004), including sub-scales for fruit (+1.1, P = 0.03), meat (+0.9, P = 0.004) and non-meat protein (+0.5, P = 0.03). CONCLUSIONThe PULSe prevention program’s nutrition messages led to significant improvements in dietary intake in men at risk of T2DM.

关键词： Dietary intake Diet quality Men Diabetes prevention program Self-directed

Adaptive Antenna Utilizing Power Inversion and Linearly Constrained Minimum Variance Algorithms

维普期刊数据库评论

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 Journal of Aeronautics 2005年第2期18卷 153-160页

作者： e.A.MOHAMeD 谈展中 School of electronic and Information engineering Beijing University of Aeronautics and Astronautics Beijing 100083 China

This paper presents a new algorithm based on the power inversion （PI） and the linearly constrained minimum variance （LCMV）. This algorithm is capable of adjusting the weights of the antenna array in real time to respond to and improve the global positioning system （GPS） received signals coming from the desired directions and at the same time to highly suppress the jammers coming from the other directions. The simulation is performed for fixed and moving jammers. It indicates that this structure can give deeper nulls, more than 115 dB depths for fixed jammers and more than 94 dB depths for moving jammers.

关键词： adaptive antenna power inversion algorithm LCMV GPS anti-jamming

Low-cost,simple,and scalable self-assembly of DNA origami nanostructures

在线全文

学校读者我要写书评

暂无评论

Nano Research 2019年第5期12卷 1207-1215页

作者： Patrick D.Halley Randy A.Patton Amjad Chowdhury John C.Byrd Carlos e.Castro Department of Chemical and Biomolecular engineering The Ohio State UniversityColumbusOH 43210USA Department of Mechanical and Aerospace engineering The Ohio State UniversityColumbusOH 43210USA Division of Hematology Department of Internal Medicineand OSU Comprehensive Cancer CenterThe Ohio State UniversityColumbusOH 43210USA Biophysics Graduate Program The Ohio State UniversityColumbusOH 43210USA

Despite demonstrating exciting potential for applications such as drug delivery and biosensing,the development of nanodevices for practical applications and broader use in research and education are still hindered by the time,effort,and cost associated with DNA origami *** and robust methods to perform and scale the DNA origami self-assembly process are critical to facilitate broader use and translation to industrial or clinical *** report a simple approach to fold DNA origami nanostructures that is fast,robust,and *** demonstrate fabrication at scales approximately 100-1,500-fold higher than typical *** further demonstrate an approach we termed low-cost efficient annealing (LeAN) self-assembly involving initial heating at 65 ℃ for 10 min,then annealing at 51 ℃ for 2 h,followed by brief quenching at 4 ℃ that leads to effective assembly of a range of DNA origami structures *** contrast to other methods for scaling DNA origami assembly,this approach can be carried out using cheap and widely available equipment (e.g.,hot plates,water baths,and laboratory burners) and uses standard recipes and materials so is readily applied to any existing or new DNA origami *** envision these methods can facilitate device development for commercial applications and facilitate broader use of DNA origami in research and education.

关键词： DNA origami DNA nanotechnology self assembly scalable nanofabrication low cost fabrication nanotechnology education

Introducing a multi-criteria indicator to better evaluate impacts of rare earth materials production and consumption in life cycle assessment

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Rare earths 2014年第3期32卷 288-292页

作者： N.Adibi Z.Lafhaj e.D.Gemechu G.Sonnemann J.Payet -cd2e Rue de Bourgogne - base 11/19 Loos-en-Gohelle 62750 France ecole Centrale de Lille Villeneuve d'Ascq 59651 France University of Bordeaux 1 Talence 33400 France ecole Polytechnique Fédérale de Lausanne Lausanne 1015 Switzerland Cycleco Amberieu

Life cycle assessment （LCA） is based on the basic principles of sustainable development. LCA method demonstrated its efficiency in providing a systematic environmental assessment approach of a product or a process. The effectiveness and efficiency of these methods lies in the fact that they take into account all life cycle stages of a product, from the extraction of raw materials to end of life treatment （recycling, ...） through an assessment covering different impact categories such as climate change, human health, ecosystems and resources. existing LCA indicators reflect different issues surrounding resource depletion, creating inconsistency and moreover confusion among LCA practitioners. The evaluation of different life cycle impacts assessment （LCIA） methods done by eC JRC showed that available models did not address the same parameters： short- vs long-term, stock vs backup technology, etc. It also showed that if the correlation between the methods was sufficient for some resources, others such as rare earth elements showed a high level of inconsistency between methods. It was therefore necessary to develop a relevant indicator and harmonized assessment of impacts on resources in LCA. Furthermore, a resource strategy indicator based on the three pillars of sustainable development （eco- nomic, environmental and social） would better address wider challenges and making it a more powerful decision making tool. This study aimed to introduce an indicator for evaluating the strategy implications of metal resources for products and to compare different ways of production resulting from extraction of raw materials or recycling, with a special focus on rare earth materials. The indicator would assess the impacts based on a reserve-resource vision [BGS NeRC] and the evolution over time and founded over three pa- rameters： technical feasibility, economic viability and political stability （including social and environmental aspects） in representing countries.

关键词： life cycle assessment (LCA) life cycle impacts assessment (LCIA) resource strategy rare earth elements

Neoproterozoic magmatism in eastern Himalayan terrane

在线全文

学校读者我要写书评

暂无评论

Science Bulletin 2017年第6期62卷 415-424页

作者： Yuhua Wang Lingsen Zeng Li-e Gao Chunli Guo Kejun Hou Lifei Zhang Wei Wang Huiyi Sun Institute of Geology Chinese Academy of Geological Sciences Beijing 100037 China Key Lab of Submarine Geosciences and Prospecting Techniques Ministry of Education and College of Marine Geosciences Ocean University of China Qingdao 266100 China Key Laboratory of Orogenic Belts and Crustal evolution School of Earth and Space Sciences Peking University Beijing 100871 China Institute of Mineral Resources Chinese Academy of Geological Sciences Beijing 100037 China Institute of Geology China Earthquake Administration Beijing 100029 China Beijing SHRIMP Centre Chinese Academy of Geological Sciences Beijing 100037 China

Geochronological investigation on gneisses of granitic to leucogranitic compositions in Cuona,south Tibet,reveal that their protoliths formed at 808.8 ± 7.9-816.4 ± 3.4 Ma and 855.8 ± 7.0 Ma,*** rims from the granitic gneiss record a metamorphic age of 739.4 ± 4.3 ***-Hf isotopic analyses on zircon grains with Neoproterozoic ages yield negative ε_(Hf)(t) values from-9.0 to-4.2,and the corresponding two-stage Hf model ages are 1965-2228 ***-rock geochemical data indicate that all granitic gneisses are K-riched calc-alkali *** new data together with literature data show that(1) the Himalayan terrane experienced an episode of Neoproterozoic magmatism at 850-800 Ma;(2) the Neoproterozoic magma of granitic compositions were derived from partial melting of ancient crusts,possibly due to the thermal perturbation related with the breakup of the Rodinia supercontinent.

关键词： FGranitic gneiss Neoproterozoic magmatism Zircon U-Pb dating eastern Himalaya

Second-Harmonic Response in Magnetic Nodal-Line Semimetal Fe3GeTe2

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2022年第9期39卷 78-82页

作者： V.D.esin A.A.Avakyants A.V.Timonina N.N.Kolesnikov e.V.Deviatov Institute of Solid State Physics of the Russian Academy of Sciences

We experimentally investigate second-harmonic transverse voltage response to ac electrical current for a magnetic nodal-line semimetal Fe3GeTe2（FGT）. For zero magnetic field, the observed second-harmonic voltage behaves as a square of the longitudinal current, as it should be expected for nonlinear Hall effect. The magnetic field behavior is found to be sophisticated: while the first-harmonic response shows the known anomalous Hall hysteresis in FGT, the second-harmonic Hall voltage is characterized by the pronounced high-field hysteresis and flat（B-independent） region with curves touching at low fields. The high-field hysteresis strongly depends on the magnetic field sweep rate, so it reflects some slow relaxation process. For the lowest rates, it is also accomplished by multiple crossing points. Similar shape of the second-harmonic hysteresis is known for skyrmion spin textures in nonlinear optics. Since skyrmions have been demonstrated for FGT by direct visualization techniques, we can connect the observed high-field relaxation with deformation of the skyrmion lattice. Thus, the second-harmonic Hall voltage response can be regarded as a tool to detect spin textures in transport experiments.

关键词： Hysteresis

蔬菜尾菜的生长猪有效能值和回肠末端氨基酸消化率的测定

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

饲料研究 2024年第13期47卷 32-36页

作者：赵雨杰杨凯李忠张帆王婧谭碧娥印遇龙马晓康湖南农业大学动物科学技术学院湖南长沙410128 中国科学院亚热带农业生态研究所湖南长沙410125

研究旨在测定蔬菜尾菜和发酵蔬菜尾菜的生长猪有效能值和回肠末端氨基酸消化率。试验一:选取18头体重为(24.15±1.60) kg的“杜×长×大”去势公猪,随机分成3组,每组6个重复,每个重复1头猪,各组分别饲喂基础饲粮、蔬菜尾菜饲粮和发酵蔬... 详细信息

研究旨在测定蔬菜尾菜和发酵蔬菜尾菜的生长猪有效能值和回肠末端氨基酸消化率。试验一:选取18头体重为(24.15±1.60) kg的“杜×长×大”去势公猪,随机分成3组,每组6个重复,每个重复1头猪,各组分别饲喂基础饲粮、蔬菜尾菜饲粮和发酵蔬菜尾菜饲粮,采用全收粪法测定其有效能值。试验二:选取18头体重为(25.31±1.40) kg“杜×长×大”去势公猪并装有T型瘘管,随机分成3组,每组6个重复,每个重复1头猪,分别饲喂无氮饲粮、蔬菜尾菜饲粮和发酵蔬菜尾菜饲粮,采用直接法测定回肠末端氨基酸消化率。结果显示:蔬菜尾菜的生长猪消化能值和代谢能值分别为9.46和9.03 MJ/kg;发酵蔬菜尾菜的生长猪消化能值和代谢能值分别为9.67和9.25 MJ/kg。蔬菜尾菜的表观和标准回肠末端氨基酸消化率分别为21.41%~54.50%和30.43%~58.26%;发酵蔬菜尾菜的表观和标准回肠末端氨基酸消化率分别为22.02%~63.28%和26.43%~67.36%。与蔬菜尾菜相比,发酵蔬菜尾菜中的粗蛋白、赖氨酸、蛋氨酸、胱氨酸、缬氨酸、丙氨酸、甘氨酸、酪氨酸标准回肠末端消化率显著提高(P<0.05)。研究表明,发酵蔬菜尾菜的粗蛋白、赖氨酸和蛋氨酸回肠末端消化率高于蔬菜尾菜。

关键词：生长猪蔬菜尾菜发酵蔬菜尾菜有效能氨基酸消化率

维普期刊数据库博看期刊

在线全文

学校读者我要写书评

暂无评论

高温高压下铁热导率的第一性原理研究

原子与分子物理学报 2024年第5期41卷 106-110页

作者：杨陈余柏树焦亩鑫杨学楠胡翠娥曾召益重庆师范大学物理与电子工程学院重庆401331

铁在高压高温下的热导率是研究地球动力学和热演化的关键参数.在以往的研究中,铁的热导率主要归结于电子热导率,我们发现铁在高压下晶格振动对热导率的贡献不可忽略.本文利用晶格动力学和玻尔兹曼输运理论计算了铁的声子色散、Hugoniot... 详细信息

铁在高压高温下的热导率是研究地球动力学和热演化的关键参数.在以往的研究中,铁的热导率主要归结于电子热导率,我们发现铁在高压下晶格振动对热导率的贡献不可忽略.本文利用晶格动力学和玻尔兹曼输运理论计算了铁的声子色散、Hugoniot状态方程和热导率.预测了铁在核幔边界附近温度约为3500 K,在地球内核边界条件约为6500 K.考虑晶格振动的热导率在地球核幔边界附近为112 W/mK,在内核边界条件约为200 W/mK.

关键词：热导率地球内核高温高压第一性原理

维普期刊数据库博看期刊