Single-step inkjet-printed paper-origami arrayed air-breathing microfluidic microbial fuel cell and its validation

Microfluidic paper based microbial fuel cells (μP-MFCs) have gained considerable popularity due to their compact, quick and low-cost fluid manipulation paradigm. Compared to conventional technologies, paper as a substrate with advanced nanomaterial electrode material has many distinct advantages from point-of-care monitoring to energy harvesting. As a result, these have been used and are more popular in a variety of fields, such as health diagnostics, environmental and food quality management. By this encouragement, herein a portable microbial fuel cell as an origami array has been demonstrated using custom carbon electrodes with a modified the transition metal oxide MnO₂ nanomaterial. This customized electrode design was first printed using a tabletop PCB inkjet printer where the anode was further modified with synthesized MnO₂ nanoparticles. The entire cell was formed by folding the paper along predefined edges where the fuel, Shewanella putrefaciens, was streamed continuously via inherent capillary cation. Various studies, such as morphological, surface catalyst coating, amount loading and volumetric culture optimization experiments, have also been accomplished to find the most appropriate optimum parameter to enhance power conversion efficiency. The developed origami arrayed microbial fuel generated an open-circuit potential (OCP) for two parallel connected MFCs of 0.534 V and a maximum power density of 15.9 μW/cm² with a maximum current density of 130 μA/cm². In the end, the harvested power was used by powering the digital watch circuit through the ultra-low DC-DC booster board. Such an MFC origami array, with simple electrode manufacturing and modification process, has a great potential and bright future in Internet of Things (IoT) applications by making multiple stacks where the data can be monitored.     

3D printed millireactors for process intensification

The scope of the present research aims at demonstrating the 3D printing use in the manufacturing of microchannels for chemical process applications. A comparison among digital model processing applications for 3D print(slicers) and a print layer thickness analysis were performed. The 3D print fidelity was verified in several devices, including the microchannels' printing with and without micromixer zones. In order to highlight the 3D print potential in Chemical Engineering, the biodiesel synthesis was also carried out in a millireactor manufactured by 3D printing. The millireactor operated under laminar flow regime with a total flow rate of 75.25 ml ? min~(-1)(increment of about 130 times over traditional microdevices used for biodiesel production).The printed millireactor provided a maximum yield of Ethyl Esters of 73.51% at 40 °C, ethanol:oil molar ratio of7 and catalyst concentration of 1.25 wt% and residence time about 10 s. As a result of flow rate increment attained in the millireactor, the number of required units for scaling-up the chemical processes is reduced. Using the approach described in the present research, anyone could produce their own millireactor for chemical process in a simple way with the aid of a 3D printer.     

State of the art in additive manufacturing and its possible chemical and particle hazards—review

Additive manufacturing, enabling rapid prototyping and so-called on-demand production, has become a common method of creating parts or whole devices. On a 3D printer, real objects are produced layer by layer, thus creating extraordinary possibilities as to the number of applications for this type of devices. The opportunities offered by this technique seem to be pushing new boundaries when it comes to both the use of 3D printing in practice and new materials from which the 3D objects can be printed. However, the question arises whether, at the same time, this solution is safe enough to be used without limitations, wherever and by everyone. According to the scientific reports, three-dimensional printing can pose a threat to the user, not only in terms of physical or mechanical hazards, but also through the potential emissions of chemical substances and fine particles. Thus, the presented publication collects information on the additive manufacturing, different techniques, and ways of printing with application of diverse raw materials. It presents an overview of the last 5 years’ publications focusing on 3D printing, especially regarding the potential chemical and particle emission resulting from the use of such printers in both the working environment and private spaces.     

DW6050工程打印机在CAD工程设计中的应用

工程图纸的打印输出历来是CAD工程设计工序中的一道瓶颈、采用高性能的工程打印机是解决这一瓶颈有效方法。dw6050是一种新型高性能工程打印机，笔者结合本单位的应用实际作了大量的调试工作，现已投入CAD工程设计应用。本文对大中型设计院的CAD应用人员有参考借鉴意义。     

Investigating the effect of paper properties on color reproduction of digital printing

Digital printing is affected by several parameters including printer and paper type which determine the final printed color gamut and the quality of reproduction. For investigation of those effects, tests were done on the three types of laser printer and six types of paper with different properties of whiteness, roughness, and gloss. The gamut volume was generated by Eye-One spectrophotometer, ProfileMaker, and ColorThink software. Properties of the different types of paper were measured by the atomic force microscopy, spectrophotometer and, goniophotometer. Results showed that the reproducibility was considerably dependent on the type of printer and type of paper. High whiteness and gloss increased the color gamut volume, while high roughness decreased the reproducibility of the printer. Tests on paper properties showed that whiteness had the most significant effect on color gamut volume.     

变频器在印刷机上的应用研究

介绍变频器在印刷机上的应用。     

智能仪器微型打印记录仪接口电路设计

TPμp-16A是一种微型针式打印机，特别适宜作为智能仪器系统的打印记录仪，论文对应用TPμp-16A的曲线打印方式实现记录曲线打印及应用图形打印方式实现汉字字符打印的软件控制方法进行了详细论述，接口电路设计占用微处理系统资源少，软件控制方便，运行可靠稳定，可推广应用各类智能仪器与收费终端，具有较好的性能价格比。     

针式打印机电源故障分析和检修方法

在打印机正常工作中，电源运行的可靠性成为一个重要环节。根椐打印机电源结构及电源电路分析和维修结果表明：首先应静态观察机内有无明显异常，即打开机壳，观察元件有无过热、烧焦现象，电路中有无脱焊、断线、印刷板有无断裂现象等。断电状态观察打印机未发现异常时，再进行通电检测。检测步骤可以从交流供电端开始逐级往后测试，也可以从电源输出级往前测试，逐步缩小故障范围，查出损坏的元件。     

棉/聚酯混纺纤维织物的蚀刻工艺研究

利用喷墨打印机将硫酸铝水溶液喷涂到棉／聚酯混纺纤维织物表面上后在高温条件下焙烘处理,对其进行图案蚀刻．对喷墨打印机在棉／聚酯混纺纤维织物表面进行图案蚀刻的技术进行了研究,优化确定出了图案蚀刻过程的最佳工艺条件,包括硫酸铝溶液中硫酸铝的质量百分含量,焙烘处理温度,焙烘处理时间等条件．     

加速数字喷墨打印技术的开发与应用——寄望于“全印制电子分会”

文章概述了数字喷墨打印技术在PCB工业中的应用前景。它将给PCB工业带来“革命性的”变革与进步,将会成为PCB生产的主流。