Struts Framework

EJB, etc.) to do the actual work, because the action class is a Web component. It takes HTTP Request as an argument into its execute() method. Coding business logic in the action class makes it less reusable and difficult to test. Action Form is a Java Bean that holds user input from the HTML form. It has the setter methods that Struts uses to set its properties from the HTTP Request object. It also has getter methods that the action class uses to access these properties. Figure 11.3 illustrates a hypothetical compound registration transaction using the Struts framework. 

Figure 11.3 Compound registration in the Apache Struts framework.

Struts provides an excellent framework for implementing Model 2 MVC. It helps developers make the system easier to maintain and change. The caveat is its learning curve and complexity to people who are new to it. However, if your system is large and complex, the overhead will definitely pay off. For a small project with a handful of JSPs and Java objects, Model 1 MVC might be more cost effective. To learn more about Struts, go to http //stmts.apache.org. Many books on Struts can be found at http //www.amazon.com. Also see Agarwal (2004). 

I. The PLAATO device (Fig. I) was the first device to be implanted in a human LAA in August 2001. Its nitinol framework features a tissue-anchoring system on the struts to maintain the correct position once deployed. The orifice of the LAA is sealed... 

In the past few years, intensive efforts have been made to create novel and original syn thetic oligomers. Many different modifications have been introduced to replace the labil peptide bond. Among the various positive developments in this field, the discovery c molecules with improved pharmacological properties compared to those of natural pep tides can be considered one of the most important. The study of the new conformationt features of these synthetic frameworks can supply additional information on the strut ture-activity relationships. 

In the MOF PIZA-3 (PIZA, porphyrinic Illinois zeolite analog), Mn(III) is found both in the porphyrin struts and as a structural metal node. The framework is structurally stable and is used for the oxidation of cycUc alkanes and alkenes with iodosylbenzene or peracetic acid as the oxidant [117]. Reaction is found to take place at the outer surface, which is justified by the authors by the unfavorable hydrophilic properties of the pore interior. Yields were similar to those obtained with homogeneous Mn(III) porphyrin systems or those immobilized inside inorganic supports as heterogeneous catalysts. Less than 0.1 mM of metalloporphyrin or degradation products were observed in the reaction mixtures, with no loss of oxidation activity observed in a second run when peracetic acid was used. 

A few strategies have already been developed for the preparation of CPs/ MOFs with catalytic properties (i) direct incorporation of metal complexes into the framework or as struts, (ii) incorporation of metal centres in CPs/ MOFs, (iii) encapsulation of catalytically actives species, in the case of MOFs, containing a particular pore system with windows and cages, and (iv) postgrafting of catalytic species, resembling the strategies used for the immobilisation of complexes onto solid supports. ... 

Network interpenetration is energetically favourable as it increases the van der Waals interactions between frameworks and therefore allows space to be packed more efficiently. Frameworks where the node-to-node distance is comparatively large compared to the width of the strut will have space for network interpenetration to occur. Those that have comparatively short struts may inhibit network interpenetration simply due to geometric space considerations. 

The flexibility of the network can also directly influence the degree of network interpenetration. CMPs with long flexible node-struts are able to respond to the local environment through bending of the strut and twisting around the node to allow individual frameworks to find space to pack efficiently in to. 

Figure 4 The Cauchy pentagon is a tensegrity framework, who.se struts (heavy lines) constitute lower bounds, and whose cables are upper bounds, on the associated distances. The upper limit on any one pair of nodes separated by a strut, or the lower limit on any one pair connected by a cable, are tetrangle inequality limits implied by the bounds that correspond to the remaining struts and cables. Such five-point tetrangle inequality limits would not be found by an algorithm that only iterates over all quadruples of atoms as above...

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