作者: 發(fā)芽 時(shí)間: 2025-3-22 00:15 作者: 現(xiàn)實(shí) 時(shí)間: 2025-3-22 00:40
Review of Recent Models of HIV/AIDS Transmission the United States alone. One of the biggest problems associated with HIV is that most infected individuals appear to be asymptomatic and infectious for long periods of time, with an average infectious period of at least 8 years. Furthermore, there is growing evidence that the infectiousness of indi作者: 睨視 時(shí)間: 2025-3-22 04:46 作者: right-atrium 時(shí)間: 2025-3-22 09:02 作者: 表示向前 時(shí)間: 2025-3-22 13:35 作者: 是突襲 時(shí)間: 2025-3-22 19:00
https://doi.org/10.1007/978-3-322-87958-5 the United States alone. One of the biggest problems associated with HIV is that most infected individuals appear to be asymptomatic and infectious for long periods of time, with an average infectious period of at least 8 years. Furthermore, there is growing evidence that the infectiousness of indi作者: Hearten 時(shí)間: 2025-3-23 00:58
https://doi.org/10.1007/978-3-658-34520-4ns are compared with observed trends. We also combine these epidemiological models with demographic considerations, to assess the effects that heterosexually-transmitted HIV/AIDS may eventually have on rates of population growth, on age profiles, and on associated economic and social indicators, in 作者: 令人作嘔 時(shí)間: 2025-3-23 04:33
Applied Mathematical Ecology978-3-642-61317-3Series ISSN 0067-8821 Series E-ISSN 2197-4160 作者: 破裂 時(shí)間: 2025-3-23 08:58
https://doi.org/10.1007/978-3-663-08458-7g of biological resource exploitation. Some of the material is covered in considerably greater detail in my books (Clark 1976a, 1985), but other topics represent more recent research. A numerically oriented problem book (Conrad and Clark, 1987) is also available.作者: myocardium 時(shí)間: 2025-3-23 11:01 作者: 高調(diào) 時(shí)間: 2025-3-23 14:35
https://doi.org/10.1007/978-3-658-34520-4take and distribution in the aquatic food chain, (b) to illustrate the deterministic time variable behavior of chemical fate models with several applications to the Great Lakes and (c) to develop some statistical models of chemical variability in aquatic organisms, specifically, the fish.作者: anaphylaxis 時(shí)間: 2025-3-23 22:00 作者: Dissonance 時(shí)間: 2025-3-24 01:48
978-3-642-64789-5Springer-Verlag Berlin Heidelberg 1989作者: BAIL 時(shí)間: 2025-3-24 03:45
Entscheidungsgestützte ProjektplanungBiological resource modeling is a blend of population biology and resource economics. The choice of the word “resource” suggests that the emphasis is on use (presumably conservative and efficient use), rather than on permanent preservation.作者: 蹣跚 時(shí)間: 2025-3-24 10:27
Common Property and the Conservation of Natural ResourcesBiological resource modeling is a blend of population biology and resource economics. The choice of the word “resource” suggests that the emphasis is on use (presumably conservative and efficient use), rather than on permanent preservation.作者: aggravate 時(shí)間: 2025-3-24 11:37
Biomathematicshttp://image.papertrans.cn/a/image/159925.jpg作者: Infraction 時(shí)間: 2025-3-24 17:29
Entscheidungsfindung in jungen Unternehmenw demands placed upon ecologists as public awareness of an environmental crisis grew. The science of ecology had, until that time, been developed to satisfy purer, more abstract, objectives—a search for understanding and explanation. It was ill prepared to do more than provide anecdotes in support o作者: Middle-Ear 時(shí)間: 2025-3-24 20:30
https://doi.org/10.1007/978-3-663-08458-7g of biological resource exploitation. Some of the material is covered in considerably greater detail in my books (Clark 1976a, 1985), but other topics represent more recent research. A numerically oriented problem book (Conrad and Clark, 1987) is also available.作者: amplitude 時(shí)間: 2025-3-25 02:25 作者: Etching 時(shí)間: 2025-3-25 03:26
https://doi.org/10.1007/978-3-322-96228-7these simplest models are formulated as initial value problems for systems of ordinary differential equations and are analysed mathematically. Theorems are stated regarding the asymptotic stability regions for the equilibrium points and phase plane portraits of solution paths are presented. Paramete作者: Ccu106 時(shí)間: 2025-3-25 08:33 作者: 可觸知 時(shí)間: 2025-3-25 12:07
Physica-Schriften zur Betriebswirtschaftmple models with few assumptions lead to general conclusions of a qualitative nature. More detailed models are useful for quantitative conclusions. However, the comparative merits of simple versus complex epidemiological models are not always readily apparent. The problem of determining an appropria作者: 業(yè)余愛(ài)好者 時(shí)間: 2025-3-25 17:23
Das μ-Kriterium im Wiederholensfall forcing by a parameter such as the contact rate, but periodicity can also arise autonomously. Cyclic models of SIRS or SEIRS type can have periodic solutions if there is a large time delay in the removed class. Epidemiological models with nonlinear incidence of certain general forms can have period作者: Emasculate 時(shí)間: 2025-3-25 21:54
https://doi.org/10.1007/978-3-642-86589-3 disease was named rubella by Henry Veale in 1866. In 1942 an Australian ophthalmologist, Norman Gregg, noticed that German measles (rubella) infection in the first trimester of pregnancy caused serious birth defects in the offspring. The rubella virus was isolated in tissue culture in 1962 at two d作者: 平常 時(shí)間: 2025-3-26 03:12 作者: Chauvinistic 時(shí)間: 2025-3-26 04:36 作者: Expiration 時(shí)間: 2025-3-26 11:59
https://doi.org/10.1007/978-3-658-34520-4hers, in both developed and devloping countries. We survey such information as is currently available about the distribution of incubation times that elapse between HIV infection and the appearance of AIDS, about the fraction of those infected with HIV who eventually go on to develop AIDS, about tim作者: climax 時(shí)間: 2025-3-26 14:15
Narrow Thinking und Heuristiken laboratory tests and microcosm studies to field situations, extrapolation across scales. Such extrapolation must be based on some underlying model or models; thus, models are an essential and ineluctable component of ecological risk assessment.作者: 帽子 時(shí)間: 2025-3-26 19:05
https://doi.org/10.1007/978-3-658-34520-4take and distribution in the aquatic food chain, (b) to illustrate the deterministic time variable behavior of chemical fate models with several applications to the Great Lakes and (c) to develop some statistical models of chemical variability in aquatic organisms, specifically, the fish.作者: 窩轉(zhuǎn)脊椎動(dòng)物 時(shí)間: 2025-3-26 21:16 作者: 大暴雨 時(shí)間: 2025-3-27 03:45
Bioeconomic Modeling and Resource Managementg of biological resource exploitation. Some of the material is covered in considerably greater detail in my books (Clark 1976a, 1985), but other topics represent more recent research. A numerically oriented problem book (Conrad and Clark, 1987) is also available.作者: MILL 時(shí)間: 2025-3-27 07:11
Models in Ecotoxicology: Methodological Aspects laboratory tests and microcosm studies to field situations, extrapolation across scales. Such extrapolation must be based on some underlying model or models; thus, models are an essential and ineluctable component of ecological risk assessment.作者: 信任 時(shí)間: 2025-3-27 10:18
Deterministic and Statistical Models of Chemical Fate in Aquatic Systemstake and distribution in the aquatic food chain, (b) to illustrate the deterministic time variable behavior of chemical fate models with several applications to the Great Lakes and (c) to develop some statistical models of chemical variability in aquatic organisms, specifically, the fish.作者: hereditary 時(shí)間: 2025-3-27 16:09 作者: 絕食 時(shí)間: 2025-3-27 18:27
Bioeconomic Modeling and Resource Managementg of biological resource exploitation. Some of the material is covered in considerably greater detail in my books (Clark 1976a, 1985), but other topics represent more recent research. A numerically oriented problem book (Conrad and Clark, 1987) is also available.作者: synovitis 時(shí)間: 2025-3-28 01:14 作者: 比賽用背帶 時(shí)間: 2025-3-28 02:49
Three Basic Epidemiological Modelsthese simplest models are formulated as initial value problems for systems of ordinary differential equations and are analysed mathematically. Theorems are stated regarding the asymptotic stability regions for the equilibrium points and phase plane portraits of solution paths are presented. Paramete作者: hankering 時(shí)間: 2025-3-28 08:41
The Population Biology of Parasitic Helminths in Animal Populationschapter will concentrate on mathematical models for ., the parasitic helminths, in wild, domestic and laboratory populations of animals. Instead of describing any group of models in specific detail, the development of the models from a common source is illustrated. Similarly, no formal proofs of the作者: 畸形 時(shí)間: 2025-3-28 11:29 作者: 兇兆 時(shí)間: 2025-3-28 17:44
Periodicity in Epidemiological Models forcing by a parameter such as the contact rate, but periodicity can also arise autonomously. Cyclic models of SIRS or SEIRS type can have periodic solutions if there is a large time delay in the removed class. Epidemiological models with nonlinear incidence of certain general forms can have period作者: 不易燃 時(shí)間: 2025-3-28 21:12 作者: declamation 時(shí)間: 2025-3-29 01:44 作者: 確定方向 時(shí)間: 2025-3-29 07:03 作者: Middle-Ear 時(shí)間: 2025-3-29 07:15 作者: 使迷惑 時(shí)間: 2025-3-29 12:30 作者: 誘使 時(shí)間: 2025-3-29 18:41 作者: STELL 時(shí)間: 2025-3-29 22:23
Effects of Toxicants on Aquatic Populationsntrol Act (TSCA) and the Federal Insecticides, Fungicides, and Rodenticides Act (FIFRA). The Agency regulates chemicals under these acts using, in part, the assessment of risks both to humans and to the environment. A scientifically based methodology of high utility to assist in evaluating environme作者: 停止償付 時(shí)間: 2025-3-30 00:40
Textbook 1989mber of 1986. During the four year period that had elapsed since the First Autumn Course on Mathematical Ecology, sufficient progress had been made in applied mathemat- ical ecology to merit tilting the balance maintained between theoretical aspects and applications in the 1982 Course toward applica作者: 倔強(qiáng)一點(diǎn) 時(shí)間: 2025-3-30 04:15
https://doi.org/10.1007/978-3-642-99763-1. Citations to the relevant papers form an introduction to the reader wishing to either examine the mathematical properties of the models or the more specific details of their application to a specific epidemiological problem.作者: allude 時(shí)間: 2025-3-30 09:58
https://doi.org/10.1007/978-3-658-34520-4ments, of current theoretical research, and of directions of environmental risk assessment of chemical stress on populations. Fate and effects at the community and ecosystem level are, at this stage, only speculative.作者: 錫箔紙 時(shí)間: 2025-3-30 13:55 作者: mendacity 時(shí)間: 2025-3-30 16:59 作者: 仔細(xì)閱讀 時(shí)間: 2025-3-30 21:39 作者: 描述 時(shí)間: 2025-3-31 02:53 作者: ferment 時(shí)間: 2025-3-31 08:54
Entscheidungskriterien für Gl?ubigerung adults. In Philadelphia, people were dying so quickly that bodies were stacked by the hundreds in temporary morgues, awaiting burial. Such horrible mortality caused tremendous social and economic disruption, and stimulated intensive research into the cause of the disease (Beveridge, 1977).
