Xem 1-20 trên 119 kết quả Mechanical consequences
  • Encounters with Epithelial Cells Over the past decade, many bacterial pathogens have been shown to enter epithelial cells (Fig. 114-2); the bacteria often use specialized surface structures that bind to receptors, with consequent internalization. However, the exact role and the importance of this process in infection and disease are not well defined for most of these pathogens. Bacterial entry into host epithelial cells is seen as a means for dissemination to adjacent or deeper tissues or as a route to sanctuary to avoid ingestion and killing by professional phagocytes.

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  • There are several differences between bamboo and wood. In bamboo, there are no rays or knots, which give bamboo a far more evenly distributed stresses throughout its length. Bamboo is a hollow tube, sometimes with thin walls, and consequently it is more difficult to join bamboo than pieces of wood. Bamboo does not contain the same chemical extractives as wood, and can therefore be glued very well [Jassen 1995].

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  • This book presents a full spectrum of views on current approaches to modeling cell mechanics. The authors of this book come from the biophysics, bioengineering, and physical chemistry communities and each joins the discussion with a unique perspective on biological systems. Consequently, the approaches range from finite element methods commonly used in continuum mechanics to models of the cytoskeleton as a cross-linked polymer network to models of glassy materials and gels.

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  • When man invented the wheel, he very quickly learned that if it wasn’t completely round and if it didn’t rotate evenly about it’s central axis, then he had a problem! The wheel would vibrate, causing damage to itself and it’s support mechanism and in severe cases, be unusable. As the task of manufacturing a replacement was so huge and time consuming, a method had to be found to minimize the problem. Research showed that the wheel and its shaft had to be in a state of balance, i.e.

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  • Tham khảo sách 'the economic crisis and its consequences for the environment', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả

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  • Why do some contaminants remain in soils indefinitely? How much of a threat do they pose to human health or the environment? The need for effective and economic site decontamination arises daily. Geoenvironmental Engineering: Contaminated Soils, Pollutant Fate, and Mitigation discusses why soils remain contaminated, focusing on the development of the factors, properties, characteristics, and parameters of soils and individual contaminants.

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  • Written by a multidisciplinary group of scientists from around the globe Environmental Restoration of Metals-Contaminated Soils provides a summary of the current environmental remediation technology.

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  • Robotics deals with the control of actuators using various types of sensors and control schemes. The availability of precise sensorimotor mappings – able to transform between various involved motor, joint, sensor, and physical spaces – is a crucial issue. These mappings are often highly nonlinear and sometimes hard to derive analytically. Consequently, there

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  • Development of packet-switched data communication networking technologies has been rapid in recent years, a phenomenon made possible by the open standardization process and the potential new territories for intellectual property creation. As a consequence, new ways of creating services have been devised, bringing more flexibility as compared to traditional telecommunications schemes.

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  • Forecasts point to a huge increase in energy demand over the next 25 years, with a direct and immediate impact on the exhaustion of fossil fuels, the increase in pollution levels and the global warming that will have significant consequences for all sectors of society. Irrespective of the likelihood of these predictions or what researchers in different scientific disciplines may believe or publicly say about how critical the energy situation may be on a world level, it is without doubt one of the great debates that has stirred up public interest in modern times....

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  • Risk management is nowadays the way to prevent serious damage or critical consequences from dangerous situations in everyday life. Although, for many years, much has been done in terms of prevention and great efforts are continuously invested into it, the concept of risk as an unforeseen event which can cause danger or a great modification of a previous situation is still an issue to be taken into account.

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  • As discussed in Section I, no prior study examines the relation between corporate governance mechanisms and the likelihood of an earnings restatement. A few studies examine the consequences of earnings restatements. William Kinney and Linda McDaniel analyze the stock price reaction for a sample of 73 firms that restated earnings between 1976 and 1985.18 They find that, on average, stock returns are negative between issuance of erroneous quarterly statements and its corrections.

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  • Although the etimology of the word risk is not certain, two possible sources are truly revealing: riscus and rizq. The mediaeval Latin word riscus signifies a reef or a rock sheer from the sea, evoking a sense of danger for the ships. The Arabic rizq can instead be interpreted as: all that comes from God, the bare essentials, from which an advantage can be taken. These two different meanings reflect the essential aspects of risks. They express the danger of suffering a loss as a consequence of adverse events but they could also relate to the acquisition of some kind of gain....

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  • One redundant characteristic of dismantling operations of nuclear facilities is the lack of exhaustive and accurate data relating to the actual state of the facilities. Most of the time the harsh working conditions (heat, dust, radiological contamination...) are rated far too severe for human workers to carry out the work. As a consequence robots are set to take over from human staff. It is necessary to use flexible, powerful and remotely-operated manipulator arms that are fitted with specially-designed processes and tools for cutting, handling and cleaning-up....

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  • As quantum theory enters its second century, it is fitting to examine just how far it has come as a tool for the chemist. Beginning with Max Planck’s agonizing conclusion in 1900 that linked energy emission in discreet bundles to the resultant black-body radiation curve, a body of knowledge has developed with profound consequences in our ability to understand nature. In the early years, quantum theory was the providence of physicists and certain breeds of physical chemists. While physicists honed and refined the theory and studied...

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  • The Nutrition and HealthTM series of books have, as an overriding mission, to provide health professionals with texts that are considered essential because each includes: (1) a synthesis of the state of the science, (2) timely, in-depth reviews by the leading researchers in their respective fi elds, (3) extensive, up-to-date fully annotated reference lists, (4) a detailed index, (5) relevant tables and fi gures, (6) identifi cation of paradigm shifts and the consequences, (7) virtually no overlap of information between chapters, but targeted, inter-chapter referrals, (8) suggestions o...

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  • The medical consequences of operating outside of the normal boundaries of a well tuned musculo-tendinous system are also poorly understood, although clearly recognized in the persistent atrophy experienced in microgravity despite rigorous exercise programs. Muscle force generation is length and velocity sensitive. The process is repetitive in the sense that muscles will always generate force based on their length-tension and forcevelocity properties, causing tendon deformation.

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  • It is important to note, however, that no matter how or if they change, UN agencies and other global entities can only be as useful as individual governments allow them to be. The agencies serve the governments, which have ultimate responsibility for overseeing service provision for their citizens. Global partners can and should offer extensive support to governments that show a clear interest in developing realistic policies and programmes to reduce vertical transmission.

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  • Sarcopenia Age-Related Muscle Wasting and Weakness: Mechanisms and Treatments P1. Some of the most serious consequences of aging are its effects on skeletal muscle. ‘Sarcopenia’, the progressive age-related loss of muscle mass and associated muscle weakness, renders frail elders susceptible to serious injury from sudden falls and fractures and at risk for losing their functional independence. Not surprisingly, sarcopenia is a significant public health problem throughout the developed world.

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  • All members of the social health insurance scheme are automatically covered by social long- term care insurance. The responsible long-term care insurance funds (Pflegekassen) are affiliated to the corresponding health insurance funds (Krankenkassen). Employees who are not covered by social LTC insurance are permitted to contract with a private long-term care insurance institution as long as they are members of a private health insurance scheme.

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