COPPER AND LEAD RECOVERY FROM DISCARDED PRINTED CIRCUIT BOARDS BY ELECTROLYSING LEACHED SOLUTION

Results of copper and lead recovery from discarded printing circuit boards (PCB) by acidic dissolution and electrodeposition are presented. A preliminary procedure of the recovery process is proposed with the following steps: disposal of the mounted electrical elements, cleaning, grinding, iron separation for grains screening, metal dissolution, and electrolysis. The composition analysis is performed to define suitable electrochemical parameters for recovery. XRF and AAS techniques are used for preliminary estimation of metal content in leached solution. LSV method is implemented to establish parameters for copper electrodeposition. The product quality is evaluated through XRD analysis. The high recovery efficiencies, 97.61% and 96.59 % for copper (in metallic form) and lead (in dioxide form), respectively, were reached.

Genomic data mining for the computational prediction of small non-coding RNA genes

The objective of this research is to develop a novel computational prediction algorithm for non-coding RNA (ncRNA) genes using features computable for any genomic sequence without the need for comparative analysis. Existing comparative-based methods require the knowledge of closely related organisms in order to search for sequence and structural similarities. This approach imposes constraints on the type of ncRNAs, the organism, and the regions where the ncRNAs can be found. We have developed a novel approach for ncRNA gene prediction without the limitations of current comparative-based methods. Our work has established a ncRNA database required for subsequent feature and genomic analysis. Furthermore, we have identified significant features from folding-, structural-, and ensemble-based statistics for use in ncRNA prediction. We have also examined higher-order gene structures, namely operons, to discover potential insights into how ncRNAs are transcribed. Being able to automatically identify ncRNAs on a genome-wide scale is immensely powerful for incorporating it into a pipeline for large-scale genome annotation. This work will contribute to a more comprehensive annotation of ncRNA genes in microbial genomes to meet the demands of functional and regulatory genomic studies.Ph.D.Committee Chair: Dr. G. Tong Zhou; Committee Member: Dr. Arthur Koblasz; Committee Member: Dr. Eberhard Voit; Committee Member: Dr. Xiaoli Ma; Committee Member: Dr. Ying X

On Building a Community to Exchange and Share Sustainable Fashion Applications

Sustainable development is a standard plan for peace and prosperity for people and the planet, now and in the future, set forth by the 2030 Agenda for Sustainable Development, which was adopted by all United Nations member states and agreed to in 2015. The Sustainable Development Goals (SDGs) are an urgent call to action for all developed and developing countries in relation to global cooperation. Many factors cause environmental pollution, but the fashion industry is considered by the United Nations Conference on Trade and Development (UNCTAD) as the second most polluting industry in the world. It accounts for 10% of global carbon emissions due to the energy used in production, manufacturing, and transportation. In particular, the factors that strongly affect the environment in the fashion industry are the textile materials, the fabric dyeing industry, and the rapid development of fast fashion. The data was collected through an online survey of 101 fashion consumers and interviews with nine target audiences who need to buy and sell used clothes or are interested in buying and selling used clothes or sustainable fashion. Sustainable design is not a new concept, but it is still quite strange to the Vietnamese. Consumer ignorance about sustainable consumption and the harmful effects of the fashion industry on planet Earth is a big reason why consumers constantly plunge into the shopping vortex. The problem of wasteful and unsustainable fashion consumption is a big global problem at a time when the fashion industry is gradually emerging into the sustainable fashion movement. This is an opportunity to build a community by connecting consumers through their essential needs, helping them raise awareness, change their behavior, and make each individual part of a sustainable fashion community. They are thus contributing to sustainable development in the future. Keywords: SDGs, sustainable fashion, sustainable consumption, communit

Red-emitting Ba2Si5N8Eu2+ conversion phosphor: A new selection for enhancing the optical performance of the in-cup packaging MCW-LEDs

In this research, the influence of the red-emitting Ba2Si5N8Eu2+ convention phosphor on the optical performance of the 7,000K and 7,700K in-cup packaging multi-chip white LEDs (MCW-LEDs) is investigated. The effect of the red-emitting Ba2Si5N8Eu2+ convention phosphor is demonstrated based on Mie Theory by Mat Lab and Light Tools software. The research results indicated that the optical performance of MCW-LEDs was crucially affected by the red-emitting Ba2Si5N8Eu2+ phosphor's concentration. This paper provides an essential recommendation for selecting and developing the phosphor materials for MW-LEDs manufacturing.Web of Science51art. no. 148615

An algorithm for hybrid regularizers based image restoration with Poisson noise

summary:In this paper, a hybrid regularizers model for Poissonian image restoration is introduced. We study existence and uniqueness of minimizer for this model. To solve the resulting minimization problem, we employ the alternating minimization method with rigorous convergence guarantee. Numerical results demonstrate the efficiency and stability of the proposed method for suppressing Poisson noise

Review of Impacts of Leadership Competence of Project Managers on Construction Project Success

Leadership - Human endeavors play an important role in all areas of socio-economic development for any country in the world. Construction investment projects need more leadership role by their own characteristics. This research aims to give an overview of the theories of project manager leadership competence, the viewpoints of evaluation of the project's success, and the views on the influence of leadership competences and the success of the project. Research on the use of reliable secondary document sources in the world is synthesized from research works, scientific reports in the field of project management. The results of this study show that there is a great deal of research literature on project manager leadership competence and the success of the project in general but not many research papers on construction projects. This research is intended to suggest further studies to determine the specific influences, from that the training direction will increase the project management competence in the field of construction

Heavy p-Block Analogues of Dithiazolyl Radicals

This thesis commences with an introduction to the chemistry and materials properties of dithiazolyl radicals and a review of previous research on the isolobal heterocyclic phosphorus-containing derivatives, particularly dithiaphospholes and diazaphospholes. P-chloro-1,3,2-benzo-dithiaphospholes were prepared from the condensation of PCl3 and 1,2-benzodithiols in good yield. Reduction afforded 2c,2e- P-P s-bonded dimers containing a formal PII oxidation state which were characterised by X-ray diffraction. Re-oxidation generates the crystallographically characterised Phalogeno- 1,3,2-benzo-dithiaphospholes. The synthesis and structural characterisation of the isolobal P-chloro-1,3,2-benzodiazaphospholes, C6H4(NR)2PCl (R = H, Me, Et, COMe, COOMe) is described. The outcome of attempted reductive coupling was found to be sensitive to reaction conditions, affording the PII dimer alongside other decomposition products characterised by Xray diffraction. Functionalisation of the P-chloro group by salt metathesis and/or condensation was used to prepare a series of poly-cyclic structures containing two or more diazaphosphole, dithiaphosphole and dithia-arsole rings linked via bridging units which were characterised by X-ray diffraction. The paddle-wheel molecules N(C7H6S2Pn)3 (Pn = P, As) were prepared by a stepwise condensation of Li[N(SiMe3)2] with P-chloro-dithiaphosphole and As-chloro-dithia-arsole whereas the bis-triamide C6H4(NR[C6H4(NR)2P])2 was prepared from condensation of the P-chloro-diazaphosphole with ortho-C6H4(NHR)2. Treatment of P-chloro-dithiaphospholes or P-chlorochloro-benzodiazaphospholes with MCl3 (M = Al, Ga) generated a series of two-coordinate phosphenium cations whose structures were determined by X-ray crystallography. This methodology was extended to prepare the heavier dithia-arsenium and dithia-stibenium cations and the structure of the first benzodithia-arsenium cation is reported. These cations are Lewis acidic and form a series of 1:1 complexes with Ph3E (E= P, As, Sb) which are characterised by multinuclear NMR. The dithiaphosphenium cation (as its GaCl4 - salt) also forms adducts with dioxane and propylene oxide but is an efficient catalyst for the cationic ring opening polymerisation (CROP) of THF to form poly(THF), [O(CH2)4]n. The conversion rate and yield is sensitive to reaction conditions. Notably the corresponding AlCl4 - salt did not polymerise THF due to reformation of the P-chloro-dithiaphosphole and formation of the adduct, AlCl3·2THF. The related arsenium and stibenium cations show limited activity as reagents for the CROP of THF

マルチユーザMIMO無線通信システムに関する研究

九州工業大学博士学位論文（要旨）学位記番号：情工博甲第325号 学位授与年月日：平成29年3月24