Four-corner arthrodesis using the 4Fusion® quadripodal shape memory staple: a long-term review

We investigated the reliability of the 4Fusion® quadripodal memory staple in a consecutive series of 59 four-corner arthrodeses in a single centre. Forty-one patients (46 wrists) had a radiological and clinical assessment at a mean follow-up of 7.4 years. Thirteen patients (13 wrists) were lost to follow-up. Bone union was achieved in all but one patient. Seven patients were reoperated, six for device removal and one for nonunion. Most patients were satisfied, had a functional range of wrist mobility, good strength and were free of pain, comparable with the best previously reported series. Level of evidence: IV

Study on Spinning Process Parameters of the Copper Bushing by Tribological Properties and Physical Testing

The bushing is a kind of ring sleeve which acts as a liner outside the mechanical parts, which needs good strength, hardness and fatigue resistance. In this paper, the copper bushing was prepared by spinning forming method, and the process parameters of spinning were explored. According to the results of material thermal simulation and test, the conclusion is that the spinning process of copper bushing needs to be carried out in two passes by reverse spinning method. The thinning rate is 30% and 25% respectively. The gap between the mandrel and the roller is 10mm, the feed ratio is 1mm/r, and the spinning temperature is 250°C.

Behavior Increase Body Immunity

Covid-19 has spread to several countries including Indonesia. Responding to the growing trend of spreading and contagion of Covid-19, which has continued to increase, since April 2020. The Covid-19 pandemic has become a disruption so we need to recognize, overcome, and prevent this uncertainty so that this uncertainty will end soon To provide advice to all levels of society to be alert to the Covid-19 outbreak as an effort to reduce the spread of the Covid-19 outbreak, one of which is to increase body immunity. The method used in this study is a survey method used to analyze the role of employees of Cibinong Sentra Medika Hospital in increasing body immunity. The survey results showed that the average "yes" answer was above 70% on the understanding and knowledge employees of Cibinong Sentra Medika Hospital about the Covid-19 virus and how to increase body immunity. The knowledge employees of Cibinong Sentra Medika Hospital about Covid 19 and community behavior regarding the prevention and transmission of Covid-19 is in a good category. This condition has become a good strength for employees of Cibinong Sentra Medika Hospital in the Covid-19 handling program. Efforts to prevent and monitor the spread of Covid-19 must continue to be carried out by various parties, in various locations/office environments or community associations/public places, including their respective communities/individuals so that there is no increase in the number of serious cases. The public is advised not to stress easily in the face of this uncertain situation during the Covid-19 pandemic

Protective Systems Ensuring Durability of Wooden Structures

Wood is a versatile material able to be used in a wide variety of situations and applications. Wood has also very good strength to weight ratio. Problem is degradation of wood due to bad external conditions. The protection of wood takes many forms including proper design detailing. The majority are directed towards the prevention of moisture access and weathering. However, there are also some design details that can also assist in reducing the risk of biological attack. Our work provides a background on a number of important subjects related to good performance of wooden structures. This paper deals with durability of wood, design for durability of wooden structures, surface modification of wood and also evaluation and monitoring of wooden structures.

Cardboard Architecture

Explorations in the use of cardboard products in architecture exist since the 1940s. However, it was not until the early 1990s, when Shigeru Ban's work emerged when cardboard products became a potential material for architecture. Since then, cardboard use in architecture has been continuously growing worldwide, and Ban's cardboard buildings have now achieved important recognition. This article reviews cardboard architecture works in academic research and professional architectural practice in the last eight decades to lay a foundation for designers to get ahead in cardboard for architecture. Cardboard products could contribute to increase more environmentally friendly and affordable architecture because they are recyclable, low-priced, and have relatively good strength to sustain loads, among other potential advantages for construction. The study summarizes the fundamentals of cardboard architectural design and diverse strategies proposed by different authors to decrease cardboard strength degradation due to the material's weaknesses.

Palm Oil Clinker As Noise Control Materials

Palm oil clinker (POC) is a waste from the production process of palm oil, a hard and porous materials. Many studies have focused on the effect of POC use on strength while this study discusses the ability of POC in concrete to absorb sound and its relationship with concrete properties. The study was done by replacing natural river sand in stages of 25, 50, 75 and 100 percent in a mixture of 1: 4 (cement: sand). Sound absorption coefficient (SAC), strength and physical properties affect the SAC were measured. Although POC significantly reduced the compressive strength but all specimens poses good strength more than 5 N/mm2. An interesting result is that POC reduces interconnected porosity and total porosity when replacement is 100% but increases interconnected and total porosity when replacement is between 50 and 75%. SAC at 315 Hz was found has good relationship with percentage of POC and density. It is obtained that POC 50% yield good strength and sufficient SAC that can address the middle frequency range problem, thus can be further suggested to be used for masonry block application for noise control materials.

A review on tribo-mechanical properties of micro- and nanoparticulate-filled nylon composites

Nylon composites are of evolving interest due to their good strength, toughness, and low coefficient of friction. Various fillers like micro- and nanoparticulates of metals and metal compounds were used to enhance the mechanical and tribological properties of nylons for many years by researchers. In this paper, an overall understanding of composites, filler materials, especially particulate filler materials, application areas of polymer composites, wear of polymers, and the effect of various fillers on tribo-mechanical properties of nylons have been discussed. The detailed review is limited to micro- and nanoparticulate fillers and their influence on the mechanical and tribological properties of various nylon matrices.

On Rough Set Theory on Achieving High Quality Cable Material Production by Green Low Carbon Technology

As the second largest machinery industry, the energy-intensive cable industry not only creates a lot of economic value but also consumes a lot of energy. It is an inevitable requirement to promote the technological development of the industry in the new era to improve the quality and efficiency and realise industrial energy-saving and consumption reduction. In order to obtain good strength and conductivity, the metal rods of cable are usually heat-treated for several hours or even several days after the rods are extruded, this is a major energy consuming process in traditional production. Based on the background, this study adopted the energy-saving equal-channel angular pressing (ECAP) technology to replace the traditional heating treatment process, and converted the simple heat conduction with thermo-mechanical energy transfer, so as to realise the good strength and conductivity matching of the cable aluminum alloy material. In this study, energy-saving ECAP technology is used to replace the traditional heat treatment process, and heat-mechanical energy transfer is used to replace the simple heat conduction, so as to achieve good strength and conductivity matching of cable aluminum alloy material. The results show that the suitable ECAP process routes can improve the microstructure of aluminum alloy with higher strength and conductivity than the traditional heating process. The research results can be used for technology upgrading and low carbon production in cable industry due to the significantly time reduction of the energy-consuming heat treatment and the high-efficient obtainment of high-quality production.