Biological factors regulating feed efficiency were investigated in replacement beef heifers to establish factors that differ between efficient and less efficient animals. Feed efficiency, measured as residual feed intake (RFI) adjusted for body ultrasound measurements, was determined in forty-seven cross-bred heifers. Reproductive differences between efficient (low RFI) and less efficient (high RFI) heifers were examined. Low RFI heifers had an earlier age at both sexual maturity (P=0.08) and conception (P=0.08), and delivered heavier calves (P=0.006). The potential of fecal progesterone metabolites (FP4M) as an indicator of sexual maturity was examined. Measurements of FP4M present a promising non-invasive alternative technique for determining the onset of sexual maturity. A subset of 36 heifers was used to determine if plasma triiodothyronine (T3) concentrations could be used to predict feed efficiency. Triiodothyronine concentrations a correlation of 0.58 (P=0.001) to those from a quadratic prediction model of RFI in heifers sampled as yearlings. / Research into reproductive characteristics associated with residual feed intake, and to determine the effectiveness of the thyroid hormones as a screening tool for feed efficient animals. / OMAFRA (Ontario Ministry of Agriculture, Food, and Rural Affairs) through the Farm Innovation Program, Agriculture Canada through the Growing Forward Project, the Canadian Cattlemen’s Association through the Beef Cattle Research Council, and the Ontario Cattlemen’s Association.

This project investigated the effects of process capability, line station operation efficiency, and line balance on the product throughput of a wooden door manufacturing process using time-and-motion study and simulation methods. The problem-solving approach DMAIC was used to identify root causes to the problems and implemented the process improvements for the production line efficiency and throughput based on lean manufacturing concepts. The investigation results indicated that the main operation of the wooden door manufacturing process was based on manual and semi-automatic operations. The process capability of whole operation before implementing process improvements was around 600 doors monthly. The coefficient of variation of process time for manual operation ranged from 12% to 23%. The semi-automatic operation ranged from 2% to 20%. The average station efficiency and throughput was 31% and 20 doors per day respectively. After implementing the removal of obvious motion waste, the processing time of the whole process reduced 22.9%. The reduced process time variation for manual operation ranged from 9% to 14%, and the semi-automatic operations ranged from 3% to 7%. The final product output had a 200% increase and the total process efficiency had 100% improvement after implementing the improved process flow design. Meanwhile, the average station efficiency and output increased to 61% and 65 doors per day, respectively.

Thesis (MScEng)--Stellenbosch University, 2012. / ENGLISH ABSTRACT: In light of the rapid depletion of the world’s oil reserves, concerns about energy security prompted the exploration of alternative sources of liquid fuels for transportation. One such alternative is the production of synthetic fuels with the indirect coal liquefaction process or Coal-To-Liquids (CTL) process. In this process, coal is burned in a gasifier in the presence of steam and oxygen to produce a synthesis gas or syngas, consisting mainly of hydrogen and carbon monoxide. The syngas is then converted to liquid fuels and a variety of useful chemicals in a Fischer Tropsch synthesis reactor. However, the traditional process for syngas production also produces substantial amounts of carbon dioxide. In fact, only about one third of the carbon in the coal feedstock ends up in the liquid fuel product using traditional CTL technology. If additional hydrogen was available, the carbon utilisation of the process could be improved significantly. The high temperature reactor (HTR) is a gas cooled Generation IV nuclear reactor ideally suited to provide electrical power and high temperature heat for the production of carbon neutral hydrogen via high temperature electrolysis. The integration of an HTR into a CTL process therefore provides an opportunity to improve the thermal and carbon efficiency of the CTL process significantly. This thesis presents a possible process flow scheme for a nuclear assisted CTL process. The system is evaluated in terms of its thermal or syngas production efficiency (defined as the ratio of the heating value of the produced syngas to the sum of the heating value of the coal plus the HTR heat input) as well as its carbon utilisation. If the hydrogen production plant is sized to produce only enough associated oxygen to supply in the needs of the gasification plant, syngas is produced at about 63% thermal efficiency, while 71.5% of the carbon is utilised in this process. It was found that the optimum HTR outlet temperature to produce hydrogen with a high temperature steam electrolysis process is 850°C. If enough process heat and electrical power are available and process equipment capacities are sufficient, the carbon utilisation of the process could be improved even further to values in excess of 90%. / AFRIKAANSE OPSOMMING: Die uitputting van die wêreld se olie-reserwes, asook kommer oor energiesekuriteit het daartoe gelei dat alternatiewe bronne van vloeibare brandstowwe vir vervoer ondersoek moes word. Een so 'n alternatief is die produksie van sintetiese brandstof d.m.v. die indirekte steenkool vervloeiing proses of sogenaamde Coal-To-Liquids (CTL) proses. In hierdie proses word steenkool in die teenwoordigheid van stoom en suurstof in 'n vergasser gebrand om 'n sintesegas of singas te produseer, wat hoofsaaklik uit waterstof en koolstofmonoksied bestaan. Die sintesegas word daarna omgeskakel na vloeibare brandstowwe en 'n verskeidenheid van nuttige chemikalieë in 'n Fischer-Tropsch-sintese reaktor. Ongelukkig produseer die tradisionele proses vir sintesegas produksie ook 'n beduidende hoeveelheid koolstofdioksied. Trouens, slegs sowat een derde van die koolstof in die steenkool roumateriaal eindig in die vloeibare brandstof produk indien van tradisionele CTL-tegnologie gebruik gemaak word. Indien addisionele waterstof beskikbaar was, kon die koolstofbenutting van die proses aansienlik verbeter word. Die hoë temperatuur reaktor (HTR) is 'n gas-verkoelde Generasie IV kernreaktor wat by uitstek geskik is om elektrisiteit en hoë temperatuur hitte te verskaf vir die produksie van koolstofneutrale waterstof d.m.v. hoë temperatuur elektrolise. Die integrasie van 'n HTR in 'n CTL-proses bied dus 'n geleentheid om die termiese- en koolstofdoeltreffendheid van die CTL-proses aansienlik te verbeter. In hierdie ondersoek word 'n moontlike proses vloeidiagram vir 'n kern-gesteunde CTL-proses voorgestel. Die stelsel is geëvalueer in terme van sy termiese- of sintesegas produksie doeltreffendheid (gedefinieer as die verhouding van die hittewaarde van die geproduseerde sintesegas gedeel deur die som van die hittewaarde van die steenkool en die HTR hitte-insette) sowel as sy koolstof-effektiwiteit. Indien die waterstof produksie-aanleg ontwerp word om net genoeg geassosieerde suurstof te voorsien om in die behoeftes van die vergassing-aanleg te voorsien, word sintesegas teen ongeveer 63% termiese doeltreffendheid vervaardig, terwyl 71.5% van die koolstof in hierdie proses benut word. Daar is bevind dat 850°C die optimum HTR uitlaat temperatuur is om waterstof d.m.v. hoë temperatuur stoom-elektrolise te vervaardig. Indien daar genoeg proses hitte en elektrisiteit beskikbaar is en die proses toerusting kapasiteite voldoende is, sou die koolstof-benutting van die proses tot meer as 90% verbeter kon word.

中國大陸歷經近三十年的努力，經濟發展快速，經濟實力大為提升，成為世界經濟中不可忽視的力量。自2002年中國加入WTO後，與世界經貿關係更為密切，為因應全球經貿的趨勢，外資企業將擴大進軍中國。從微觀及宏觀經濟角度來看，外資的引進對中國國有企業來說，必定受到程度上的競爭衝擊，但外資對中國經濟的生產技術、產業提升發揮正面積極效果，既能夠刺激國有企業的變革、提昇產品品質、擴大國內消費需求。 本文利用2001-2005年中國30個省、市與直轄市的官方統計資料，運用隨機邊界法（stochastic frontier production function）估計中國本資、港澳台資及外資企業的生產效率。 最主要的研究發現為，2001至2005年，投資於中國大陸的港澳台資與外資企業的投資績效均優於本資企業，且港澳台資與外資企業的投資效率值相近，而本資企業則遠低於港澳台資與外資企業。雖然本資企業的效率值在這五年間處於較低的狀態，但與港澳台資、外資企業之間的差距越來越小。在規模報酬方面，本資、港澳台資與外資企業均處於規模報酬遞增階段。 在各省的效率值上，本資、港澳台資與外資企業分佈不盡相同。本資企業在海南、浙江、江蘇、廣東、上海的效率值最高，港澳台資在北京、上海、寧夏、江蘇、河北最高，外資企業則是在上海、北京、陜西、天津、廣東效率值最高。效率值較高的地區分部仍偏重東部沿海地帶。 在影響效率值的因素方面，經濟區位及資本勞動比是影響中國大陸投資效率高低的重點因素。

Bakgrund: Dagens industriella marknad möter ständig hård konkurrens. Konkurrensen leder till att företagen måste arbeta med olika typer av förbättringar. OEE (Overall Equipment Effectiveness) är en av de mest använda metoderna för att arbeta med förbättringar. Syftet med OEE är att mäta produktionseffektiviteten för en enskild maskin. Problem: Data som används måste samlas in med effektiva metoder, vara relevant och sedan bearbetas ändamålsenligt. Om problemen kring data inte behandlas, finns en risk att förbättringen försvåras. Använd data måste förstås av hela organisationen. Därför vill studien skapa en logisk arbetsmetod som ökar produktionseffektiviteten med fokus på att involvera människor och data. Syfte: Syftet med studien är att ge en djupare förståelse till synen på produktionseffektivitet samt ta fram en arbetsmetod för ökad produktionseffektivitet. Metod: Studie har använt en abduktiv ansats för att besvara syftet och frågeställningarna. Data har hämtats från en fallstudie på Sandvik AB där även intervjuer har genomförts. Intervjuerna och inhämtad data från fallföretaget har jämförts parallellt med en utförd litteraturstudie. Litteraturstudien har genomförts över områdena OEE-förbättringar, datainsamling och generella förbättringsmetoder. Slutsats: Företag kan genom vår presenterade arbetsmetod säkerställa att människor involveras djupare i förbättringsarbetet kring produktionseffektivitet. Arbetsmetoden ger förutsättningar för trovärdig data som samlas in effektivt och analyseras för att generera välgrundade förbättringsförslag. / Background: Today's industrial market is facing fierce competition. The competition forces companies to work with different types of improvements. OEE (Overall Equipment Effectiveness) is one of the most useful methods of working with improvements in manufacturing. The purpose of OEE is to measure the production efficiency of an individual machine. Problem: Data used must be collected with effective methods, be relevant and then processed appropriately. It will be hard to make improvements if problems concerning data are not addressed. Data used must also be understood by the whole organization. Therefore, the study wants to create a logical working method that increases production efficiency with a focus on involving people and data. Purpose: The aim of the study is to give a deeper understanding of the view of production efficiency and to develop a working method of increasing production efficiency. Method: The study has used an abductive approach to answer the purpose and research questions. Data has been derived from a case study at Sandvik AB where interviews have been conducted. The interviews and collected data from the case company have been compared in parallel with a conducted literature review. The literature review is conducted in the fields of OEE-improvement methods, data collection and general improvement methods. Conclusions: Through our presented working method, companies can ensure that people become more involved in the improvement work on production efficiency. The method provides conditions for efficiently collecting and analyzing credible data to generate wellfounded suggestions for improvement.

隨著二十一世紀的到來，企業將面臨3C時代的衝擊（Customer, Change, Competition），如何快速回應顧客需求，如何保持彈性以因應世界舞台迅速地變化，以及如何有效控制成本、妥善配善資源、提升效率以提高競爭力，便成為企業生存中最重要的課題了。 　　為滿足顧客之需求，企業不斷地在其產品特色上下功夫，而產品多樣化與複雜性的特色亦對生產成本及生產效率造成了一定程度之衝擊。本研究之研究主題一即在探討產品複雜性對生產成本與生產效率之影響。 　　綜觀國內外之企業經營，研究開發投資儼然已成為企業競爭的一項重要指標。但在資源有限的情況下，如何妥善分配資源於生產與研究開發之間，便成為一項有趣的課題。本研究之研究主題二即在探討新產品開發未獨立於正常產品，對生產成本與生產效率造成之影響。 　　在產品少量多樣之產業，如何兼顧客戶需求及設備產能之充分運用，是生產排程人員必須面對的重要課題。生產排程之方式不僅會影響整體之產能運用，更會影響產品生產的作業及資源之耗用，因而本研究之研究主題三即在探討生產排程方式對生產成本與生產效率之影響。 　　本研究採取實地（Field）及實地實證（Field Empirical）研究的方式進行。本研究以國內某鋼鐵廠之煉鋼段為實證對象，並以民國88年5月的生產批次為樣本。為了對個案公司及其產業有足夠的了解，筆者在民國八十七年十月至民國八十八年六月之期間內，每週約花費二至三天的時間，利用訪談、觀察、及閱讀書面資料等方式，重新了解各種產品耗用資源的情況，並以作業制成本制度之精神重新計算各批產品成本。 　　生產成本迴歸分析結果顯示，產品複雜性及新產品開發對生產成本皆有不利之影響性，生產排程方式亦會對生產成本造成影響。 　　關於生產效率分析方面，以效率值為反應變數之迴歸分析結果顯示，產品複雜性及新產品開發對生產效率皆有不利之影響性。而生產排程方式亦會對生產效率造成影響。 　　總上所述，本研究發現，影響生產成本與生產效率之因素眾多，從產品特色到生產流程皆有可能性。而影響製造費用之因素，亦會影響生產效率，故透過對製造費用之控制，可進一步達成對生產效率之改善。 / With 21 century, an enterprise will face the 3C times(Customer, Change, Competition). It has became the most important issues for surviving that how to respond customers rapidly, how to keep flexibility, how to control cost effectively, how to allocate resources appropriately, and how to improve efficiency. 　　The enterprise continues to enhance the features of products to satisfy customers. Then, the diversity and complexity of products will influence production cost and production efficiency. One topic of this research is to explore products diversity how to influence production cost and production efficiency. 　　R&D has became an important index of competitive ability in domestic and overseas enterprises. Because of the restriction of resources, it becomes an interesting issue that how to allocate resources between production and R&D. One topic of this research is to explore R&D that is dependent of normal production how to influence production cost and production efficiency. 　　In the industry of products diversity, production planners must look after customer's needs and equipment's capacity. Production planning will influence not only the use of equipment's capacity, but also production activities and resources used. The other topic is to explore production planning how to influence production cost and production efficiency. 　　The study is field and field empirical study. A steel-making department of a steel plant is our research object, and the production jobs in May are our samples. In order to be familiar with our research object and the industry, we immerse ourselves into the environment two or three days per week, and use interviews, observation, and papers reading to understand each product how to consume resources. We also calculate each product cost in Activity-Based System. 　　The result of production cost regression shows that product complexity and R&D will effect adversely production cost. Production planning also will influence production cost. 　　About production efficiency analysis, the regression with a dependent variable of CCR shows that product complexity and R&D will effect adversely production efficiency. Production planning also will influence production efficiency. 　　In short, the study shows that many factors will influence production cost and production efficiency, and it is possible from product features to production process. The factors that influence overhead also influence production efficiency, so we can improve production efficiency by controlling overhead.

Michael Porter於1991年首先對於以往環保政策會傷害廠商營運的論點提出反對的觀點，Porter認為環保政策可以刺激廠商進行創新及研發，最終將使廠商的營運情況提升，變得更有競爭力。Porter hypothesis(PH)提出之後，許多學者便針對PH的主張進行實證研究，然而至今學者間對於PH的存在與否仍無明確的共識。然而PH的主張對於像是中國大陸等發展中的國家尤為重要，而中國近期的十二五計畫亦將經濟發展及環境保護放在同等重要的位置，因此驗證PH是否成立以了解環保政策對於廠商及至國家經濟發展的影響則有助於政策的制定。本研究以實證分析的方式研究PH的主張是否存在於廠商的生產效率之中，並試圖找出造成過去實證研究矛盾的可能因素。本研究使用中國大陸的面板資料，分析模型對環保政策及廠商生產效率進行分析。

Clinical diagnosis of vitamin B12/cobalt (Co) deficiency is difficult due to the unspecific nature of the clinical symptoms. The apparent increase in vitamin B12 deficiency in New Zealand in the late 1990’s made it clear that health providers were very reliant on plasma reference ranges to diagnose deficiency. However, the lack of quantitative data of what these reference ranges represent in terms of supply of vitamin B12, has prevented a better understanding of the metabolism of vitamin B12 within sheep. This thesis describes the development of an experimental approach to measure vitamin B12 production and absorption in sheep. The model was then used to investigate whether the type of carbohydrate source affects vitamin B12 production and/or absorption. In the first trial (Chapter 4), an adaptation of the repletion technique of Suttle (1974) for copper was used. Previously vitamin B12 depleted sheep were maintained on a diet of 400 g DM meadow hay and 250 g DM crushed barley and which provided a daily intake of 0.03 mg Co. Sheep were intravenously infused with known quantities of vitamin B12 (0 – 200 nmol hydroxycobalamin/d) to determine whether a relationship exists between plasma vitamin B12 concentration and rate of entry of the vitamin into the bloodstream and to quantify the relationship. Eight ewes fitted with rumen and abomasal cannulae were used in a paired 4x4 Latin square design. Four levels of vitamin B12 were infused into the jugular vein for 4 d followed by recovery period of 17 d and the plasma responses measured during this period. Control animals maintained relatively stable plasma levels while levels in treated animals rose sharply within 4 h after the start of infusion. The responses were proportional to infusion rate with a highly significant difference in concentrations observed between treatments (P<0.001). Appearance of vitamin B12 in the plasma was quantified by the relationship Y(pmol/l) = 238 + 102x0.74 where x = infusion rate(nmol B12/d), R² = 0.945. Plasma levels declined rapidly on cessation of infusion and had returned to original pre-treatment levels by the end of the recovery period. The second trial (Chapter 5) quantified plasma responses in relation to dietary Co supply to the rumen. The same eight rumen and abomasal cannulated ewes were used in a paired 4x4 Latin square with 4 levels of intra-ruminal Co infusion in amounts ranging from 0 – 1 mg Co/d as CoSO₄, infused for 4 d followed by a 19 d recovery period. Plasma vitamin B12 response was measured as were concentration of vitamin B12 in abomasal digesta supernatant and digesta liquid flow, the latter using polyethylene glycol as liquid phase marker. Plasma concentration increased from approximately 300 pmol/l to 750 – 800 pmol/l, peaking at day 5 after commencement of infusions. Control animals infused with water maintained base-line plasma vitamin B12 levels around 250 pmol/l. Digesta liquid flow was estimated at 14.6 l/d. The results from Chapters 4 and 5 allowed estimates of vitamin B12 production and absorption. These results are discussed and efficiency of capture of Co into vitamin B12 from dietary Co intake was estimated to decrease from 8.4% to 0.74% as Co intake increased from 0.03 to 1.11 mg Co/d. Absorption coefficient was estimated from the relationships between abomasal vitamin B12 flow and plasma response. The absorption coefficient was calculated to increase from 7 to 10% as abomasal vitamin B12 flow increased from 108 to 142 nmol/d. The current animal model was subsequently used in the final trial (Chapter 6) to investigate whether the type of carbohydrate supplied in the diet influences vitamin B12 production and absorption. The same eight ewes fitted with rumen and abomasal cannulae were used in a 2x4 cross-over design. Half of the ewes were maintained on the basal diet and crushed barley while, for the remainder, the barley was replaced by 250 g of fructose:sucrose in a 80:20 mix during a 7 d period of adaptation. While on their respective diets, both groups were then infused with 0.3 mg Co/d for 6 d, a level chosen to optimise plasma vitamin B12 response. All ewes were then returned to the basal diet and barley for a 15 d recovery period after which treatments were reversed and the procedure repeated. Rumen pH, valeric, propionic, butyric, succinic, and acetic acid and ammonia concentrations were not significantly affected by diet. Digesta flow was 30% greater on a diet enriched with starch compared to sugar-enriched diet. There was an observed difference in vitamin B12 production. However there was no significant diet x time effect on plasma vitamin B12 concentration so any difference in production was negated by a difference in absorption. Carbohydrate supplied as water soluble carbohydrate or starch does not appear to influence plasma vitamin B12 concentration.

Made available in DSpace on 2014-08-20T14:22:09Z (GMT). No. of bitstreams: 1 Dissertacao_Mateus_da_Silveira_Pasa.pdf: 779921 bytes, checksum: e5dd392dabd79e2fe56a2bd98b16bc33 (MD5) Previous issue date: 2011-03-10 / The pear crop is weak in Brazil, although there are regions suitable for cultivation, as the South Region. This mainly due to lack of studies on the most adapted cultivars, the best rootstock x scion, floral abortion and knowledge about bearing habit of the main cultivars. The objective of this study was to evaluate the bearing habit, growth, production and quality of pear of the cultivars Carrick, Packham's Triumph and William's grafted on different quince rootstocks and Pyrus calleryana. In the first part of the study it was evaluated the bearing habit, in which we assessed the following variables: percentage of vegetative spurs, reproductive spurs, vegetative brindles, reproductive brindles and borses and total number of flower buds. In this first part we obtained the following results: the bearing habit of cultivars (cvs) Carrick, Packham's and William's is influenced by different rootstocks; in all cultivars tested, regardless of the rootstock, in general, there was an inverse relationship between the percentage of vegetative spurs and reproductive spurs; the most significant influence of the rootstock is about reproductive spurs formation of the cultivars evaluated; cultural management in the orchards of cvs. Carrick, Packham's and William's, especially on the pruning operation should be oriented according the rootstock used. In the second part of the study it was evaluated production, growth and quality of fruit through the following variables: plant production (kg plant-1), productive efficiency (kg.m-3), total soluble solids (TSS), expressed in ºbrix, firmness (PF), expressed in kilograms; latter two variables were performed using non-destructive analysis trough NIR-Case (SACM); fruit mass (kg); fruit diameter (mm); trunk diameter (mm) and branch length (cm). According with the results obtained, the cvs. Carrick, Packham's and William's are more efficient when grafted onto the rootstock of quince 'Portugal' and 'MC'; 'Adam's', 'D'Angers' and 'Smyrna'; and 'Champion', respectively; the productive efficiency of cvs. Carrick, Packham's and William's, in general, is inversely proportional to the vigor induced by rootstocks; fruits of cvs. Carrick, Packham's and William's tend to accumulate a larger amount of soluble solids (TSS) when grafted on less vigorous rootstocks. . / A cultura da pereira ainda é pouco expressiva no Brasil, embora existam regiões aptas para seu cultivo, como a Região Sul. Isso é devido principalmente à carência de estudos sobre as cultivares mais adaptadas, as melhores combinações copa x porta-enxerto, abortamento floral e o conhecimento do hábito de frutificação das principais cultivares. Objetivou-se com esse trabalho avaliar o hábito de frutificação, crescimento, produção e qualidade de peras das cultivares Carrick, Packham s Triumph e William s, enxertadas sobre diferentes porta-enxertos de marmeleiro e Pyrus calleryana. Na primeira parte do trabalho avaliou-se o hábito de frutificação, em que foram avaliadas: percentagem de dardos, lamburdas, brindilas vegetativas, brindilas floríferas e de bolsas e número total de gemas floríferas. Dessa primeira parte foram obtidos os seguintes resultados: O hábito de frutificação das cultivares Carrick, Packham s e William s é influenciado pelos diferentes porta-enxertos; em todas as cultivares avaliadas, independente do porta-enxerto, em geral, houve uma relação inversa entre a percentagem de dardos e de lamburdas; a influência mais significativa do porta-enxerto é sobre a formação de lamburdas das cultivares avaliadas; o manejo cultural nos pomares das cvs. Carrick, Packham s e William s, principalmente por ocasião da poda, deve ser orientado em função do porta-enxerto utilizado. Na segunda parte do trabalho foram avaliados a produção, crescimento e qualidade de frutas, através das seguintes variáveis: produção por planta (Kg planta- 1); eficiência produtiva (Kg.m-3); sólidos solúveis totais (SST), expresso em o brix; firmeza de polpa (FP), expressa em kg; Estas duas últimas variáveis foram realizadas através de análise não-destrutiva, com o equipamento NIR-Case (SACMI); massa de frutas (Kg); diâmetro da fruta (mm); diâmetro de tronco (mm) e comprimento de ramos (cm). De acordo com os resultados obtidos, as cvs. Carrick, Packham s e William s são mais eficientes quando enxertadas sobre os porta- enxertos de marmeleiro Portugal e MC ; Adam s , D Angers e Smyrna ; e Champion , respectivamente; a eficiência produtiva das cvs. Carrick, Packham s e William s, em geral, é inversamente proporcional ao vigor induzido pelos porta- enxertos avaliados; frutas das cvs. Carrick, Packham s e William s tendem a acumular uma maior quantidade de sólidos solúveis totais (SST) quando enxertadas sobre porta-enxertos menos vigorosos.

El texto completo de este trabajo no está disponible en el Repositorio Académico UPC por restricciones de la casa editorial donde ha sido publicado. / This article proposes a mechanical development of a dry cell in order to obtain HHO through water electrolysis. Calculations and technical specifications of the materials used for implementation are supported by mathematical, physical and chemical formulas and theories (Faraday´s Law, electrolysis process and mechanical design). The importance of mechanical design is focused on achieving efficient use of the energy provided to the cell that allows the H2 and O2 molecules to be separated without overheating the cell, evaporating the water, loss of current due to the geometry of the electrodes (Foucault Current). Moreover, choosing materials for proper implementation and physical robustness is mandatory. In addition, the mechanical design is not justified in different articles. Nevertheless, the mechanical design of the cell and the efficiency in the production of HHO are related. Therefore, the mechanical design and the calculations were performed, as well as the construction of the dry cell to obtain HHO. The results of the implementation and production were placed and compared with what theoretically the dry cell should produce from the law of Faraday. Finally, the volumetric flow of HHO obtained was 2.70 L per minute. It means a production efficiency of 98.68%. It is higher than the majority of the dry cells. / Revisión por pares