检索结果-南通市图书馆

Rainfall Infiltration Return Frequency Estimates

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Atmospheric and Climate Sciences 2013年第4期3卷 595-609页

作者： T. V. hromadka II M. Phillips P. Rao B. Espinosa T. hromadka III California State University Fullerton USA hromadka and associates Rancho Santa Margarita USA United States Military Academy West Point USA

Depth-duration analysis, such as accomplished for rainfall, can be useful in the analysis of infiltration of rainfall. The assessment of infiltration depth-duration in terms of return frequency is of interest. In this paper, depth-duration values of daily rainfall infiltration are estimated using the National Resources Conservation Service (NRCS) Curve Number (CN) approach for estimating daily runoff. The CN methods may be generally applicable to soils that are free draining. From the estimated history of daily infiltration, a depth-duration analysis is accomplished for all duration sizes from 1 day to 365 days. These annual outcomes are then analyzed as to a possible underlying probability distribution. For the rain gages considered, the depth-duration infiltration estimates (using the CN approach) appear to be normally distributed. From the fitted distribution, estimates of rare events of rainfall infiltration may be made, and possible linkage to earth movement events accomplished with respect to return frequency of infiltration, which in turn can aid in the design and risk assessment of fixed works involving soil water accumulation.

关键词： Infiltration Depth-Durations Return Frequency Infiltration Estimates Probability Distributions

Forgotten node:A case report

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2009年第39期15卷 4974-4975页

作者： Patrick M Fratellone Melissa A Holowecki Fratellone Medical associates

Sister Mary Joseph nodule or node refers to a palpable nodule bulging into the umbilicus and is usually a result of a malignant cancer in the pelvis or *** it has been considered a sign of ominous *** malignancies,most commonly gastric,colon and pancreatic cancer account for about 52% of the underlying *** cancers,most commonly ovarian and uterine cancers account for about 28% of the sources.

关键词： Umbilical node Sister Mary Joseph node Gastroenterology Gastric malignancies Endometriosis

Assessment of Ice Volume Changes in the Cryosphere via Simplified Heat Transport Model

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

American Journal of Climate Change 2014年第5期3卷 421-428页

作者： T. V. hromadka II H. D. McInvale M. Phillips B. Espinosa Department of Mathematical Sciences United States Military Academy West Point New York USA hromadka & associates Rancho Santa Margarita CA USA

In order to describe changes in ice volume in the cryosphere, a differential equation mathematical model is used in this paper. The dominating effects of freezing and thawing in the cryosphere enable simplification of the heat transport equations. This results in a mathematical model that can be solved exactly and is useful in investigating other climatic components, which in turn may be similarly analyzed for possible Global Circulation Model (GCM) validation. Data forms representing temperature and ice volume during the Pleistocene are available and can be directly compared with the exact solution of the simplified differential equation used in this paper. The model parameters may then be adjusted to approximate the effects of climate change;the adjusted model then run in reverse time, to develop an alternative history of ice volume of the cryosphere to be compared with the actual data interpretations previously published in the literature. In this fashion, an assessment may be made as to possible climate impacts in the cryosphere.

关键词： Global Climate Change Cryosphere Phase Change Cumulative Departure Method

Sun, climate, hunger, and mass migration

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China Earth Sciences 1998年第5期41卷 449-472页

作者： KennethJ.Hsu Tarim associates AG Zurich Switzerland

Paleoclimatic studies indicate four epochs of global cooling during the last 4 000 years, i.e. during the few centuries before and after 2000 BC, 800 BC, 400 AD, and 1 600 AD; the quasiperiodicity corresponds to cyclic variation of solar activity. Global temperature changes influenced regional precipitation patterns: Northern Europe was wetter while the middle and low latitude lands were more arid during colder epochs. Both sets of cold climatical conditions were unfavorable for agricultural production. Historical records show that large demographic movements in history took place because of crop failures and mass starvation, rather than escaping from war zones. The "wandering" of the Germanic tribes during the first two or three centuries of the Christian Era is one example. Whereas the accelerated release of carbon dioxide from the burning of fossil fuels is ultimately to cause global warming, historical evidence indicates, however, that global warming has been on the whole a blessing to mankind. Global cooling, on the other hand, has curtailed agricultural production and has led to famines and mass migrations of people. Perhaps the most important task at the present is not so much computer modelling of greenhouse effect on global climate, but water management and agricultural researches to insure food supply for an everincreasing world population.

关键词： sun climate hunger mass migration.

MOS Capacitance-Voltage Characteristics Ⅱ.Sensitivity of Electronic Trapping at Dopant Impurity from Parameter Variations

在线全文

学校读者我要写书评

暂无评论

Journal of Semiconductors 2011年第12期32卷 1-11页

作者：揭斌斌薩支唐 Department of Physics Xiamen University CTSAH associates Gainesville

Low-frequency and high-frequency Capacitance-Voltage （C-V） curves of Metal-Oxide- Semiconductor Capacitors （MOSC）, including electron and hole trapping at the dopant donor and acceptor impurities, are presented to illustrate giant trapping capacitances, from 〉 0.01Cox to 〉 10Cox. Five device and materials parameters are varied for fundamental trapping parameter characterization, and electrical and optical signal processing applications. Parameters include spatially constant concentration of the dopant-donor-impurity electron trap, NDD, the ground state electron trapping energy level depth measured from the conduction band edge, Ec - ED, the degeneracy of the trapped electron at the ground state, gD, the device temperature, T, and the gate oxide thickness, xox.

关键词： trapping capacitance donor dopant impurity electron trap MOS

MOS Capacitance-Voltage Characteristics Ⅲ.Trapping Capacitance from 2-Charge-State Impurities

在线全文

学校读者我要写书评

暂无评论

Journal of Semiconductors 2011年第12期32卷 12-27页

作者：揭斌斌薩支唐 Department of Physics Xiamen University CTSAH associates Gainesville

Low-frequency and high-frequency capacitance-voltage curves of Metal-Oxide-Semiconductor Capacitors are presented to illustrate giant electron and hole trapping capacitances at many simultaneously present two-charge-state and one-trapped-carrier, or one-energy-level impurity species. Models described include a donor electron trap and an acceptor hole trap, both donors, both acceptors, both shallow energy levels, both deep, one shallow and one deep, and the identical donor and acceptor. Device and material parameters are selected to simu- late chemically and physically realizable capacitors for fundamental trapping parameter characterizations and for electrical and optical signal processing applications.

关键词： MOS silicon trapping capacitance dopant impurities donors acceptors

Vascular disease in the older adult

在线全文

学校读者我要写书评

暂无评论

Journal of Geriatric Cardiology 2016年第9期13卷 727-732页

作者： Andrew P Miller Christopher M Huff Gary S Roubin Cardio Vascular associates Birmingham Alabama USA

1 Introduction Among older adults, incidence and prevalence of aortic disease, peripheral arterial disease （PAD）, and venous thromboembolism （VTE） increase as age-related alterations in vascular structure and function are compounded by longer exposure to cardiovascular disease （CVD） risk factors. This review highlights the unique presentations and treatment strategies for aortic dissection, abdominal aortic aneurysm （AAA）, PAD, and VTE in older adults.

关键词： Aortic diseases Cardiovascular disease Peripheral arterial disease The elderly

Underground mine stream crossing assessment:A multi-disciplinary approach

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Mining Science and Technology 2021年第1期31卷 59-65页

作者： Kevin Andrews Steve Keim Marshall Miller&associates BluefieldVA 24605USA

Underground mine designs typically try to avoid extraction beneath streams and rivers of any significant size,especially when the overburden rock thickness between the stream bed and the mine is *** issues with mining beneath streams include excessive groundwater inflow to the mine,weak ground(roof,floor,and pillar)conditions,horizontal stress effects,as well as stream loss and other potential adverse environmental ***,there are times when crossing beneath a stream or river is necessary to move into a new area of mineral reserve without creating additional mine access points from the ground ***,stream crossings are completed without thorough assessment,potentially resulting in increased costs,decreased safety,and,in some cases,failure to advance the *** of the most favorable location(s)to cross the stream must account for numerous factors and the associated assessment often requires a multi-disciplinary *** crossing investigations often require geological,hydrogeological,geotechnical,and geophysical *** of stream crossing investigations include desktop evaluation of maps and aerial photography,stream bed observations,drilling,detailed rock core logging,downhole geophysical surveying,hydraulic conductivity testing(packer testing),geotechnical laboratory testing,assessment,and *** deliverables from a stream crossing assessment typically include geological,geotechnical,and hydrogeological characterization of potential stream crossing locations,classification of favorable and unfavorable crossing locations,recommendations for entry design and pillar sizing,and recommendations for if,and how,to conduct pre-grouting *** of technical aspects of data collection and assessment are provided based on decades of industry experience conducting stream crossing assessments in various underground mining scenarios.

关键词： Underground mining Geotechnical Stream-crossing Hydrogeology Characterization

REENGAGING THE LAND AT THE GEORGE *** PRESIDENTIAL CENTER

在线全文

学校读者我要写书评

暂无评论

Journal of Green Building 2014年第3期9卷 3-22页

作者： Laura Solano Herb Sweeney IV Michael Van Valkenburgh associates Landscape Architects Senior Associate Michael Van Valkenburgh AssociatesLandscape Architects

In planning the George *** Presidential Center in Dallas,Texas,former First Lady Laura Bush presented a very clear vision of what the Center should epitomize:“Because George was the first president of the new millennium,I wanted it to be forward and modern.”1 For the president and *** this meant making the building and landscape environmentally responsible,beautiful,and *** particular,their love of native Texas landscapes was an important framework for transforming the project’s urban site into a park that was sustainable and experientially rich for *** was addressed from the start with smart planning that privileged contiguous parkland over impermeable surfaces and *** consideration of every landscape component—-stormwater,plants,soil,topography,and more—netted cohesive natural systems that are better able to succeed with short-term establishment and provide enduring long-term health,the ultimate goals for a sustainable landscape.

关键词： presidential libraries parks sustainable landscapes stormwater management cistern irrigation tank forebay bioswale native ecologies native plants prairies meadows planting soil Texas