粉末型硅烷／有机硅添加剂在水泥基材中的应用

介绍了有机硅作为憎水剂在水泥基材料中的作用,介绍了有机硅粉状憎水剂的主要组分及其性能。通过实验证明,有机硅粉状添加剂SHP50及SHP60是一种高效的憎水剂,应用于水泥基干混材料中,赋予了砂浆良好的疏水特性。     

Natural Antifungal Peptides/Proteins as Model for Novel Food Preservatives

A large range of ingredients for food and food products are subject to fungal contamination, which is a major cause of destruction of crops, exposure of animals and humans to invasive mycotoxins, and food spoilage. The resistance of fungal species to common preservation methods highlights the necessity of new ways to increase the shelf life of raw material for food and food products. Antimicrobial peptides and proteins (AMPs) are essential members of the immune system of most living organisms. Due to their broad range of activity and their stability to commonly used food processes, they represent promising alternatives to traditional preservatives. However, despite the growing number of reports of potential food applications of these AMPs, the number of approved peptides is low. Poor solubility, toxicity, and a time‐consuming extraction are hurdles that limit their application in food products. Thanks to a deep understanding of the key determinants of their activity, the development of optimized synthetic peptides has reduced these drawbacks. This review presents natural and synthetic antifungal peptides/proteins (AFPs), effective against food‐related fungi, with particular emphasis on AFPs from plant sources. The design of novel antifungal peptides via key elements of antifungal activity is also reviewed. The potential applications of natural and synthetic AFPs as novel antifungal food preservatives are finally discussed.     

Fungal dyes for textile applications: testing of industrial conditions for wool fabrics dyeing

Natural dyes and pigments have been proposed as an eco-friendly alternative to artificial pigments. Among the diverse organisms able to synthesize natural dyes and pigments, several wood inhabiting fungi produce extracellular compounds which have been tested to dye fabrics at laboratory conditions with good results. However, the dyeing conditions used at laboratory level not necessary meet the real conditions in which dyeing of fabrics is conducted at industrial level. In this work, yellow and red dyes producing fungi, Penicillium murcianum and Talaromyces australis, respectively, were isolated from wood samples and used to dye wool fabrics at conditions of temperature, pH, additives, and equipment similar to those used at industrial level. After dyeing treatments, color fastness to washing, wet and dry rubbing, and tensile strength were tested. Satisfactory results were found when the dyes were used individually and mixed to different proportions. According to the results, natural dyes synthesized by these two wood inhabiting fungi have great potential to be used for dyeing of wool at industrial level.     

An investigation on thermal, metallurgical and mechanical states in weld cracking of Inconel 738LC superalloy

The influence of various conditions of Inconel 738 superalloy welding or deposition welding has been studied in order to shed light on the coupling between thermal, metallurgical and mechanical states in the heat affected zone (HAZ) in which cracking may occur particularly during welding and post-weld heat treatment. Predominant crack controlling factors have been highlighted thanks to different pre-weld and post-weld heat treatments, in addition to various welding rates and pre-heating prior to welding. These factors are mainly the material ductility related to the morphology and volume fraction of intermetallic precipitates and thermally induced residual stress. It has appeared that reducing thermally induced residual stress could be more effective for preventing cracking than controlling the material ductility in the related zones thanks to adjustment of pre-weld and post-weld heat treatments. With the objective of cracking remediation, welding on preheated parts leads to lower weld power, to reduce significantly thermal gradients, decreases thermally induced stress and impedes cracks formation despite some localized and temporary decrease in alloy ductility.     

Gonadotrophin hormone releasing hormone agonist in cases of severe paraphilia: a lifetime treatment?

Six patients with severe paraphilia were treated with a long-acting gonadotrophin hormone releasing hormone analogue (GnRH-a). In five cases, the antiandrogen treatment ended their deviant sexual behaviour and markedly decreased their sexual fantasies and activities without significant side-effects. The beneficial effects of this treatment were maintained for 7 years in the patient where there was the longest follow-up. Two patients abruptly withdrew front their antiandrogen treatment at the end of the first and third year, respectively. Both relapsed within 8-10 weeks. One of them asked for resumption of antiandrogen treatment. In another case, in order to phase out antiandrogen treatment, testosterone (T) was added to the GnRH-a. In spite of normal T levels, and of resumption of normal sexual activities and deviant fantasies, deviant sexual behaviour did not return. A smoother phasing out of GnRH-a treatment is thought to be better than an abrupt withdrawal. However, the duration of antiandrogen treatment necessary to ensure a complete disappearance of deviant sexual behaviour remains uncertain, but is at least 4 years.     

Lightweight PUF based authentication scheme for fog architecture

Fog computing improves efficiency and reduces the amount of bandwidth to the cloud. In many use cases, the internet of things (IoT) devices do not know the fog nodes in advance. Moreover, as the fog nodes are often placed in open publicly available places, they can be easily captured. Therefore, it should be ensured that even if the key material is leaked from the fog devices, the previously generated session keys and the identity of the devices can be kept secret, i.e. satisfying anonymity, unlinkability, perfect forward secrecy and resistance against stolen devices attack. Such demands require a multi-factor authentication scheme, which is typically done by providing input of the user with password or biometric data. However, in real use case scenarios, IoT devices should be able to automatically start the process without requiring such manual interaction and also fog devices need to autonomously operate. Therefore, this paper proposes a physical unclonable function (PUF) based mutual authentication scheme, being the first security scheme for a fog architecture, capable of providing simultaneously all these suggested security features. In addition, we also show the resistance against other types of attacks like synchronization and known session specific temporary information attack. Moreover, the scheme only relies on symmetric key based operations and thus results in very good performance, compared to the other fog based security systems proposed in literature.

     

Contactless functional testing of grating-coupled evanescent wave (bio)chemical sensors

The contactless measurement of the sole modulus of the reflection coefficient of a grating-coupled slab waveguide sensor at three definite points of the reflection spectrum gives all necessary information for the determination of the complete set of phenomenological parameters of a waveguide grating (bio)chemical sensor thanks to a physically meaningful representation of the resonant reflection of a free space wave in the form of a circle in the complex plane. This property leads to a simple, non-destructive, wafer-scale functional testing methodology for grating-coupled (bio)chemical sensor chips.     

An iterated local search heuristic for multi-capacity bin packing and machine reassignment problems

This paper proposes an efficient Multi-Start Iterated Local Search for Packing Problems (MS-ILS-PPs) metaheuristic for Multi-Capacity Bin Packing Problems (MCBPP) and Machine Reassignment Problems (MRP). The MCBPP is a generalization of the classical bin-packing problem in which the machine (bin) capacity and task (item) sizes are given by multiple (resource) dimensions. The MRP is a challenging and novel optimization problem, aimed at maximizing the usage of available machines by reallocating tasks/processes among those machines in a cost-efficient manner, while fulfilling several capacity, conflict, and dependency-related constraints. The proposed MS-ILS-PP approach relies on simple neighborhoods as well as problem-tailored shaking procedures. We perform computational experiments on MRP benchmark instances containing between 100 and 50,000 processes. Near-optimum multi-resource allocation and scheduling solutions are obtained while meeting specified processing-time requirements (on the order of minutes). In particular, for 9/28 instances with more than 1000 processes, the gap between the solution value and a lower bound measure is smaller than 0.1%. Our optimization method is also applied to solve classical benchmark instances for the MCBPP, yielding the best known solutions and optimum ones in most cases. In addition, several upper bounds for non-solved problems were improved.