Effects of tailwater depth on spillway aeration

Hydraulic structures such as spillways or weirs with their water-air controlling mechanisms are not only important for their structural properties but also for their effects on downstream ecology. Tailwater depth is an important factor affecting dissolved oxygen transfer and aeration rates of spillways. In this study, effects of tailwater depths and discharge values on the aeration efficiencies of laboratory-model smooth and stepped spillways were investigated. Changes of tailwater depths affect the dissolved oxygen transfer rates and aeration efficiencies are affected more than 100%, resulting in supersaturated dissolved oxygen concentrations. Tailwater depth is a significant parameter in the design of the spillway and the stilling basin of dams. Therefore, this value should be estimated correctly

Community Structure of Mangrove Vegetation in Mengkapan Village Sungai Apit District of Siak

The research was conducted in January-February 2017 in Mengkapan Village, Sungai Apit, District of Siak. The purpose of study was to determine the structure community of mangrove in Mengkapan Village. The method used in the research was survey method. The stations were determined based on human activity. Each station was determined in three transects set along 100 m from the sea toward the land. The number of plots was 27, with the size of 10 x 10 m2 for tree criteria, 5 x 5m2 for sapling criteria, and 2 x 2m2 for the seedlings criteria. The results of this study found 10 species of mangrove. The vegetation was dominated by species of R. apiculata with value 155.71%. The status of mangrove vegetation in Mengkapan Village, Sungai Apit was in bad condition, with the average density of 607.40 ind/ha

Determination of Physiological, Biochemical and Molecular Effects of Zinc Stress on the Growth of Sunflower Seedlings (Helianthus annuus L.)

Heavy metal contamination is an important environmental problem all over the world. High concentrations of heavy metals cause permanent damage stocells and tissues. In this study, the toxic effects of zincheavy metal in sunflower plant in population and molecular parameters were investigated. The effects of zincheavymetalon sunflower seedlings were determined using the changes in population parameters; rootlength, dry weight, and total solubleprotein content. Total protein content of sunflower plants was determined in a relationship in the opposite direction increasing the amount of metal concentrations. Genotoxic effects of heavymetal of zinc on sunflower plants were revealed by using changes in genomic template stability (GTS). According to analyses, serious changes in genomic template stability were detected and these results were compared with the growth, dry weight and total soluble protein content of the seedlings grown at various zinc concentrations. Also, it was seen that the genomic template stability significantly affected the primary root length, root dry weight and root total soluble protein content. Positive correlations were observed between physiological, biochemical and molecular parameters in sunflower seedlings under zinc stress.In conclusion, a comparison between physiological, biochemical and molecular parameters shows that zinc is a genotoxic agent for sunflower plants

Analysis of Biomass and Carbon Stock on Mangrove Forest Ecosytem in North Coastal Area of Rupat Island Riau Province

Analysis of biomass and carbon stock on mangrove forest ecosytem in coastal area of North Rupat Riau Province has been conducted in January 2016. The method used in this study is a survey method with purposive sampling technique. The study showed that the potential mangrove biomass was directly proportional to mangrove carbon stocks. The average yield of biomass, carbon stocks of soil organic carbon and CO2 sequestration on mangrove forest was reserves amounted to 68,64 tons/ha , 904,75 tons/ha and 251,39 tons/ha, while the average yield of total carbon stocks was 973,31 tons/ha

Structure Community of Mangrove in the Village a Pantai Cermin Kiri Districts Pantai Cermin Regency of Serdang Bedagai the Province of North Sumatra

Study was conducted in february 2017. This report aims to understand structure community of mangrove in the village Pantai Cermin kiri in the Pantai Cermin North Sumatra. Methods used in research is method of surveying. The research station based on human activity. In every station divided into 3 transects with long transects 50 m lead from the sea to land. The number of a plot used by 27, with each size 10 x 10 m2 to tree level, 5 x 5 m m2 to the saplings, and 2 x 2m2 to level seedling. The result of this research found 7 mangrove species in the village Pantai Cermin kiri. Vegetation that dominated is Rhizophora apiculata with INP of 300 %. A condition of vegetation in the village Pantai Cermin Kiri in the shore Pantai Cermin mangrove are forest area is still in good with the density of of 2377,78 tree / ha

Struktur Komunitas Makrozoobentos di Daerah Padang Lamun Muara Sungai Riau Kota Tanjungpinang Provinsi Kepulauan Riau

This research was conducted in June 2013 at Riau River Estuary inTanjungpinang City Riau Islands Province. This research aimed to find out themacrozoobenthos community structure and its relationship to seagrass vegetation.The method on the research was survey method. The existence of macrozoobenthosin this area showed the dynamic symbiosis among seagrass and marine organisms.The results also showed seagrass ecosystem had the high potential to be managed andused by communities and also increasing the fisheries productivity on coastal area.Species composition of macrozoobenthos in the area consisted of 8 species, i.e.Strombus sp, Cerithidea quadrata, Pina bicolor, Anadara sp, Anadara inflata,Atactodea striata, Asteroidea sp and Diadema sitosum. Two species of seagrassvegetation were found in this area, those were Enhalus acoroides, and Halophilaovalis. T-test analysis showed that the average of macrozoobenthos abundance oneach station differed unsignificantly (p>0,05). The regression analysis showed thatrelationship among seagrass vegetation diversity and macrozoobenthos abundancewas at r=0,35

Abundance And Distribution Pattern Of Mangrove Snail Telescopium Telescopium In The Darul Aman Coastal Of Rupat, Bengkalis District, Riau

The research was conducted on September to October 2014. The study aims were to determine the abundance, size distribution and distribution pattern of mangrove snail (T. telescopium) in the Darul Aman Coastal Bengkalis Regency. The method used was a survey method. Samples of snail population and sediment were collected by a single visit during low tide. Location of study was divided into 3 stations. Station I have grow rare mangrove, residential community and coastal abrasion, station II have dense and closely mangrove, station III have close with river estuary, rarely struck high tide because higher dan mangrove grow rarely than. The sample analysis carried out in Marine Biologi Laboratory of Fishery and Marine Science Faculty of Riau University.The results of the study show that the highest abundance of snail was at the station III (2,05 ind/m2) and the lowest was at the station I (0,6 ind/m2). The most dominant of size distribution is 81 – 90 mm. Distribution pattern in this area is uniform with Id between 0,88 – 0,98

Arte y moda: ¿fusión o encuentro? Reflexiones filosóficas

La moda se encuentra con el arte como expresión de una densidad estética que muchas veces la inspira y atraviesa. Sin embargo, el arte de hoy no sólo es una influencia sustantivapara la moda sino que, muchas veces, se fusiona con aquel en una desesperada búsqueda denuevos escenarios de seducción y de venta. En este sentido, moda y museo parecen tener dinámicas concordantes. Por otra parte, la evolución de las industrias culturales condiciona losmodos de relación entre arte y moda, y cuestiona a la belleza como la categoría fundamentalpara el encuentro.Fashion meets art as an expression of aesthetic density that often inspires and crosses. However, today's art is not only a substantial influence for fashion but often merges withthat in a desperate search for new scenes of seduction and selling. In this sense, fashion andmuseum seem to have consistent dynamics. Moreover, the development of cultural industries determines the forms of relationship between art and fashion, and questions the beauty as thefundamental category for the meetingA moda se encontra com a arte como expressão de uma densidade estética que muitasvezes a inspira e atravessa. Sem embargo, a arte de hoje não só é uma influência substantivapara a moda senão que, muitas vezes, se fusiona com aquela numa desesperada procura denovos cenários de sedução e de venda. Neste sentido, moda e museu parecem ter dinâmicasconcordantes. Por outro lado, a evolução das indústrias culturais condiciona os modos de relação entre arte e moda, e questiona à beleza como a categoria fundamental para o encontro

Los nuevos aprendizajes del sujeto digital

If we had to quickly trace the evolution of exchanges between information technology and education we should distinguish at least three phases: pioneering experiences, integration and manipulation of digital resources and virtualization. However, this process of appropriation has also been maturing and therefore motivated to reflect on their own teaching practices, pointing limits and possibilities. Today, we are witnessing the entry into another stage of that evolutionary path that could be termed as “post-digital”. Here they are, then, issues that challenge not only the way to educate (comprehensive didactics of knowledge) but also interpret the formation of new cultural habits whose exercise does not recognize mediations or eliminates instances of control. Often it proposes a logic of “direct action” behind which a power that needs to be recognized and measured by its consequences is hidden. The magnitude of this change happened within the “knowledge society” that generates an educational alert requesting our attention on the nascent organization criteria “Curriculum digital intervention”; this is an intervention that has spread already from objects to people. Therefore, the relationship with the devices, platform selection, availability of information, the ubiquity of consultations, intervention and network management, and application development is the new digital environment that requires transdisciplinary approaches and a humanizing approach to avoid the danger of generating a mass of subjects adapted to the paradigms of the XXI century.Si tuviéramos que trazar rápidamente la evolución de los intercambios entre las tecnologías de la información y la educación deberíamos distinguir, al menos, tres fases: las experiencias pioneras, la integración, y la instrumentalización de recursos digitales y virtualización. Sin embargo, ese proceso de apropiación ha sido también de maduración y, por ende, ha motivado una reflexión sobre las propias prácticas docentes, señalando lí- mites y posibilidades. Quizás, hoy asistimos al ingreso en otra etapa de aquella trayectoria evolutiva que se podría denominar como de “post-digitalización”. Aquí aparecen, entonces, cuestiones que desafían no sólo la manera de educar (abarcativa de la didáctica de los saberes) sino que también interpelan la formación de nuevos hábitos culturales cuyo ejercicio no reconoce mediatizaciones, elimina instancias de control y, muchas veces, propone lógicas de “acción directa” detrás de las que se oculta un poder que necesita ser reconocido y medido por sus consecuencias. La magnitud de este cambio sucedido en el seno de la “sociedad del Conocimiento” dispara un alerta educativo que solicita nuestra atención sobre los criterios de organización del naciente “Currículo de intervención digital”; una intervención que se ha extendido –hace tiempo ya– desde los objetos hasta las personas. Por todo ello, la relación con los dispositivos, la selección de plataformas, la disponibilidad de la información, la ubicuidad de las consultas, la intervención y administración de redes, y el desarrollo de aplicaciones constituyen el novedoso ambiente digital que requiere abordajes transdisciplinarios y una mirada humanizadora para no sucumbir al peligro de generar una masificación de los sujetos adaptada a los paradigmas del siglo XXI.Se tivéssemos que delinear a evolução dos intercâmbios entre as tecnologias da informação e a educação deveríamos distinguir ao menos três fases: as experiências pioneiras, a integração e a instrumentação de recursos digitais e virtualização. Contudo, o processo de apropriação foi também de maduração, e, portanto, motivou uma reflexão sobre as próprias práticas docentes, apontando limites e possibilidades. Talvez hoje assistamos ao ingresso em outra etapa de aquela trajetória evolutiva que se poderia denominar como de pós-digitalização. Aqui aparecem, então, questões que desafiam não somente o modo de educar (contida na didática dos saberes) senão que também interpelam a formação de novos hábitos culturais cujo exercício não reconhece mediatizações, elimina instancias de controle e, muitas vezes, propõe lógicas de ação direta detrás das quais se oculta um poder que precisa ser reconhecido e medido por suas conseqüências. A magnitude desta mudança sucedida no interior da sociedade do conhecimento dispara um alerta educativo que precisa de nossa atenção sobre os critérios de organização do novo currículo de intervenção digital, uma intervenção alargada desde os objetos até as pessoas. Por tudo isso, a relação com os dispositivos, a seleção de plataformas, a disponibilidade da informação, a ubiqüidade das consultas, a intervenção e administração de redes, e o desenvolvimento de aplicações constituem o novo ambiente digital que precisa abordagens transdisciplinares e uma mirada humanizante para não sucumbir ao perigo de gerar uma massificação dos sujeitos adaptada aos paradigmas do século XXI