Creat membership Creat membership
Sign in

Forgot password?

Confirm
  • Forgot password?
    Sign Up
  • Confirm
    Sign In
home > search

Now showing items 81 - 96 of 79599

  • Review of "Practical Epilepsy," by Aatif M. Husain

    Kaur, Inrundeep  

    Download Collect
  • Temporal Stress Changes Caused by Earthquakes: A Review

    Hardebeck, Jeanne L.   Okada, Tomomi  

    Download Collect
  • Book Review: Alamein . By Simon Ball

    Kabalek, Kobi  

    Download Collect
  • Book Review: Alamein . By Simon Ball

    Kabalek, Kobi  

    Download Collect
  • Software architecture review by association

    Antony Tang   Man F. Lau  

    Highlights • The objective of this paper is to help designers review the causal relationships between software design elements. • In Design Association Theory, causal relationship is the basis of associating architectural design concerns, design problems and design solutions. • We propose an association-based five-step review procedure to systematically identify design reasoning issues. • We studied three industrial software architecture design cases, and found design reasoning issues in all three cases. • We generalize reasoning failures into eight different design reasoning failure scenarios. Abstract During the process of software design, software architects have their reasons to choose certain software components to address particular software requirements and constraints. However, existing software architecture review techniques often rely on the design reviewers’ knowledge and experience, and perhaps using some checklists, to identify design gaps and issues, without questioning the reasoning behind the decisions made by the architects. In this paper, we approach design reviews from a design reasoning perspective. We propose to use an association-based review procedure to identify design issues by first associating all the relevant design concerns, problems and solutions systematically; and then verifying if the causal relationships between these design elements are valid. Using this procedure, we discovered new design issues in all three industrial cases, despite their internal architecture reviews and one of the three systems being operational. With the newly found design issues, we derive eight general design reasoning failure scenarios.
    Download Collect
  • Review on metals additively manufactured by SEBM

    Wang, J.   Tang, H.  

    Selective electron beam melting (SEBM) is a typical powder bed fusion based additive manufacturing (AM) technology. Compared with other AM technologies for metals, SEBM offers two distinct advantages: high vacuum environment and low residual stresses. Since the appearance of the technique in 1992, a number of strong improvements have been made to SEBM, and a wide variety of metallic materials have been processed and evaluated. To date, SEBM has proved to be competent in the manufacturing of complex metallic parts with excellent mechanical properties. As a result, it is being increasingly adopted by industry. However, from the point of research and industrial applications, the fundamental research of the technique is not enough and theoretical study of the metallurgical process is of particular importance. Meanwhile, developing advanced systems, new structures and alloys special for SEBM should be important for the future development.
    Download Collect
  • Review of elemental mercury (Hg0) removal by CuO-based materials

    Dong YE   Xiao-xiang WANG   Run-xian WANG   Xin LIU   Hui LIU   Hai-ning WANG  

    Mercury emission has become a great environmental concern because of its high toxicity, bioaccumulation, and persistence. Adsorption is an effective method to remove Hg0 from coal-fired flue gas, with adsorbents playing a dominant role. Extensive investigations have been conducted on the use of CuO-based materials for Hg0 removal, and some fruitful results have been obtained. In this review, we summarize advances in the application of CuO-based materials for Hg0 capture. Firstly, the fundamentals of CuO, including its crystal information and synthesis methods, are introduced. Then, the Hg0 removal capability of some typical CuO-based adsorbents is discussed. Considering that coal-fired flue gas also contains a certain amount of NO, SO2, H2O, NH3, and HCl, the impacts of these species on adsorbent Hg0 removal efficiency are summarized next. By generalizing the mechanisms dominating the Hg0 removal process, the rate-determining step and the key intermediates can be discovered. Apart from Hg0, some other air pollutants, such as CO, NOx, and volatile organic compounds (VOCs), account for a certain portion of flue gas. In view of their similar abatement mechanisms, simultaneous removal of Hg0 and other air pollutants has become a hot topic in the environmental field. Considering the Hg0 re-emission phenomena in wet flue gas desulfurization (WFGD), mercury capture performance under different conditions in this device is discussed. Finally, we conclude that new adsorbents suitable for long-term operation in coal-fired flue gas should be developed to realize the effective reduction of mercury emissions.
    Download Collect
  • 3D printing of glass by additive manufacturing techniques:a review

    Dao ZHANG   Xiaofeng LIU   Jianrong QIU  

    Additive manufacturing (AM),which is also known as three-dimensional (3D) printing,uses computer-aided design to build objects layer by layer.Here,we focus on the recent progress in the development of techniques for 3D printing of glass,an important optoelectronic material,including fused deposition modeling,selective laser sintering/melting,stereolithography (SLA) and direct ink writing.We compare these 3D printing methods and analyze their benefits and problems for the manufacturing of functional glass objects.In addition,we discuss the technological principles of 3D glass printing and applica-tions of 3D printed glass objects.This review is finalized by a summary of the current achievements and perspec-tives for the future development of the 3D glass printing technique.
    Download Collect
  • Sorption of Organic Pollutants by Humic Acids: A Review

    Chianese, Simeone   Fenti, Angelo   Iovino, Pasquale   Musmarra, Dino   Salvestrini, Stefano  

    Download Collect
  • Nanomaterials by Design: A Review of Nanoscale Metallic Multilayers

    Sáenz-Trevizo, Angelica   Hodge, Andrea Maria  

    Download Collect
  • Review: Scale and the Incas, by Andrew James Hamilton

    Guernsey, Julia  

    Download Collect
  • Preparation of metal foam by different methods: A review

    Kulshreshtha, Anurag   Dhakad, S.K.  

    Download Collect
  • Review of Hydrogen Production by Catalytic Aqueous-Phase Reforming

    Vaidya, Prakash D.; Lopez-Sanchez, Jose A.  

    Catalytic aqueous-phase reforming (APR) produces higher quality hydrogen (with less carbon monoxide) and carbon dioxide from weak solutions of bio-carbohydrates in a single reactor at low temperatures. It provides a good opportunity for the effective valorisation of biomass-derived products. It is advantageous than steam reforming because it saves energy by avoiding vaporization of the biofeed and lowers cost by precluding an extra water gas shift reactor. As evident from the numerous published works during the past decade, there is growing academic and industrial interest in the APR process. This review updates recent literature on APR of many biomass surrogates such as glycerol, ethylene glycol, sorbitol, ethanol and glucose. Most works focused on the development of efficient catalysts for selective hydrogen production and they were deliberated comprehensively. Key insights into improved catalysts and reaction conditions were highlighted. New inferences on the thermodynamic, kinetic and reactor engineering aspects of the APR process were analysed too. This thorough appraisal of the current literature, which is hitherto missing, will surely contribute to the development of the next generation of catalysts and reactors for commercial applications of the APR process.
    Download Collect
  • Collagenolytic enzymes produced by fungi: a systematic review

    Maria Carolina de Albuquerque Wanderleya   José Manoel Wanderley Duarte Netoa   José Luiz de Lima Filhoa   Carolina de Albuquerque Limab   José António Couto Teixeirac   Ana Lúcia Figueiredo Portod  

    Specific proteases capable of degrading native triple helical or denatured collagen have been required for many years and have a large spectrum of applications. There are few complete reports that fully uncover production, characterization and purification of fungi collagenases. In this review, authors searched through four scientific on line data bases using the following keywords (collagenolytic OR collagenase) AND (fungi OR fungus OR fungal) AND (production OR synthesis OR synthesize) AND (characterization). Scientific criteria were adopted in this review to classify found articles by score (from 0 to 10). After exclusion criteria, 21 articles were selected. None obtained the maximum of 10 points defined by the methodology, which indicates a deficiency in studies dealing simultaneously with production, characterization and purification of collagenase by fungi. Among microorganisms studied the non-pathogenic fungi Penicillium aurantiogriseum and Rhizoctonia solani stood out in volumetric and specific collagenase activity. The only article found that made sequencing of a true collagenase showed 100% homology with several metalloproteinases fungi. A clear gap in literature about collagenase production by fungi was verified, which prevents further development in the area and increases the need for further studies, particularly full characterization of fungal collagenases with high specificity to collagen.
    Download Collect
  • A review for chromium removal by carbon nanotubes

    Ioannis Anastopoulos   Vasileios A. Anagnostopoulos   Amit Bhatnagar   Athanasios C. Mitropoulos   George Z. Kyzas  

    Water pollution is still a serious problem for the entire world. Adsorption technology is a promising process which is based on the fabrication of novel, cheap, non-dangerous and highly sorptive materials for application in wastewater purification processes. Nanomaterials are functional groups which find use in many important fields such as medicine, food processing and agriculture. This review collects information from published works about the use of carbon nanotubes as efficient and promising adsorbents in chromium removal from (real or synthesised) wastewater. For this purpose, isotherm (Langmuir, Freundlich, etc.), kinetic (pseudo-first-, second-order, etc.), thermodynamic (free-energy Gibbs, enthalpy, entropy) and desorption–regeneration studies were discussed in detail. Moreover, significant factors such as pH, agitation time, temperature, adsorbent dosage and initial dye concentration are also reported extensively. The maximum monolayer adsorption capacities of Cr(III) and Cr(VI) ions were 0.39–238.09 and 1.26–370.3 mg/g, respectively. The absolute values of ΔG0 and ΔH0 ranged 0.237–48.62 and 0.16–58.43 kJ/mol, respectively.
    Download Collect
  • Targeting the Cerebellum by Noninvasive Neurostimulation: a Review

    van Dun, Kim; Bodranghien, Florian; Manto, Mario; Mariën, Peter  

    Transcranial magnetic and electric stimulation of the brain are novel and highly promising techniques currently employed in both research and clinical practice. Improving or rehabilitating brain functions by modulating excitability with these noninvasive tools is an exciting new area in neuroscience. Since the cerebellum is closely connected with the cerebral regions subserving motor, associative, and affective functions, the cerebello-thalamo-cortical pathways are an interesting target for these new techniques. Targeting the cerebellum represents a novel way to modulate the excitability of remote cortical regions and their functions. This review brings together the studies that have applied cerebellar stimulation, magnetic and electric, and presents an overview of the current knowledge and unsolved issues. Some recommendations for future research are implemented as well.
    Download Collect
1 2 3 4 5 6 7 8 9 10

Contact

If you have any feedback, Please follow the official account to submit feedback.

Turn on your phone and scan

Submit Feedback