1,420 research outputs found
Energy-efficient CMOS large-load driver circuit with the complementary adiabatic/bootstrap (CAB) technique for low-power TFT-LCD system applications
No full textDynamic analysis of ring stiffened conical-cylindrical shell combinations with general coupling and boundary conditions
No full textDue to excellent mechanical and physical properties, the conical and cylindrical shell combinations reinforced by ring stiffeners are widely used in practical engineering applications such as missiles, torpedoes, rockets and naval hulls of submarines. Since these structures are usually subjected to the intricate environment as well as dynamic loads resulting in fatigue damage, vibration and radiated noise, thoroughly understanding dynamic behavior of the shell combinations is essential to develop adequate vibration control strategy for their fatigue life at the design stage
Band overlap via chemical pressure control in double perovskite (Sr2-xCax)FeMoO6 (0 ≦ x ≦ 2.0) with TMR effect
No full textFungi genus and concentration in the air of onion fields and its opportunistic action related to mycotic keratitis in southern Taiwan
No full textModelling groundwater systems: Understanding and improving groundwater quantity and quality management
No full textGroundwater is one of the most important natural resources. It is the principal source of drinking water in rural and many urban cities, and widely used for irrigation in most arid and semi-arid countries. However, recently it has become apparent that many human activities are negatively impacting both the quantity and quality of groundwater resources. In many parts of the world, groundwater resources are under increasing threat due to contamination and depletion by excessive pumping.Hydraulic EngineeringCivil Engineering and Geoscience
Is traditional Chinese medicine recommended in Western medicine clinical practice guidelines in China? A systematic analysis
Full text linkBackgroundEvidence-based medicine promotes and relies on the use of evidence in developing clinical practice guidelines (CPGs). The Chinese healthcare system includes both traditional Chinese medicine (TCM) and Western medicine, which are expected to be equally reflected in Chinese CPGs.ObjectiveTo evaluate the inclusion of TCM-related information in Western medicine CPGs developed in China and the adoption of high level evidence.MethodsAll CPGs were identified from the China Guideline Clearinghouse (CGC), which is the main Chinese organisation maintaining the guidelines issued by the Ministry of Health of China, the Chinese Medical Association and the Chinese Medical Doctors’ Association.TCM-related contents were extracted from all the CPGs identified. Extracted information comprised the institution issuing the guideline, date of issue, disease, recommendations relating to TCM, evidence level of the recommended content and references supporting the recommendations.ResultsA total of 604 CPGs were identified, only a small number of which (74/604; 12%) recommended TCM therapy and only five guidelines (7%) had applied evidence grading. The 74 CPGs involved 13 disease systems according to the International Classification of Diseases 10th edition. TCM was mainly recommended in the treatment part of the guidelines (73/74, 99%), and more than half of the recommendations (43/74, 58%) were related to Chinese herbal medicine (single herbs or herbal treatment based on syndrome differentiation).ConclusionsFew Chinese Western medicine CPGs recommend TCM therapies and very few provide evidence grading for the TCM recommendation. We suggest that future guideline development should be based on systematic searches for evidence to support CPG recommendations and involve a multidisciplinary approach including TCM expertise
Data assimilation in particle models for groundwater contamination
No full textElectrical Engineering, Mathematics and Computer Scienc
Large-eddy simulation of kerosene spray combustion in a model scramjet chamber
No full textLarge-eddy simulation (LES) of kerosene spray combustion in a model supersonic combustor with cavity flame holder is carried out. Kerosene is injected through the ceiling of the cavity. The subgrid-scale (SGS) turbulence stress ensor is closed via the Smagorinsky’s eddyviscosity model, chemical source terms are modelled by a finite rate chemistry (FRC) model, and a four-step reduced kerosene combustion kinetic mechanism is adopted. The chamber wallpressure predicted from the LES is validated by experimental data reported in literature. The test case has a cavity length of 77mm and a depth of 8mm. After liquid kerosene is injected through the orifice, most of the droplets are loaded with recirculation fluid momentum inside the cavity. Due to lower velocity of the carrier fluid inside the cavity, sufficient atomization and evaporation take place during the process of droplet transportation, resulting in a rich fuel mixture of kerosene vapour accumulating inside the cavity. These rich fuel mixtures are mixed with fresh air by the approachmixing layer at the front of the cavity and are thus involved in burning accompanied with the approach boundary layer separation extending towards upstream. The combustion flame in the downstream impinges onto the rear wall of the cavity and is then reflected back to the front of the cavity. During the recirculation of hot flow, heat is compensated for evaporation of droplets. The circulation processes mentioned above provide an efficient flame-holdingmechanism to stabilize the flame.Comparisons with results froma shorter length of cavity (cavity length of 45mm) show that, due to insufficient atomization and evaporation of the droplets in the short distance inside the cavity, parts of the droplets are carried out of the cavity through theboundary layer fluctuation and evaporated in the hot flame layer, thus resulting in incomplete air fuel mixing and worse combustion performance. The flow structures inside the cavity play an important role in the spray istribution, thus determining the combustion performance
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