Unions: Rent Extractors or Creators?

Unions: Rent Extractors or Creators

Success Stories in Asian Aquaculture

The stories presented in this book reflect the unique nature of Asian aquaculture, providing first-time insight into how and why it has become so successful. Overall, the book demonstrates how the resiliency, adaptability, and innovation of small-scale aquaculture farmers have been crucial to this success. It also places aquaculture development in Asia into a wider global context, and describes its relationship to natural systems, social conditions, and economics. The book is unique in its in-depth presentation of primary research on Asian aquaculture, and in demonstrating how aquaculture can have a lasting positive impact on livelihoods, food security, and sustainable development

Multiband tunneling in trilayer graphene

The electronic tunneling properties of the two stable forms of trilayer graphene (TLG), rhombohedral ABC and Bernal ABA, are examined for pn and pnp junctions as realized by using a single gate (SG) or a double gate (DG). For the rhombohedral form, due to the chirality of the electrons, the Klein paradox is found at normal incidence for SG devices while at high energy interband scattering between additional propagation modes can occur. The electrons in Bernal ABA TLG can have a monolayer- or bilayer-like character when incident on a SG device. Using a DG however both propagation modes will couple by breaking the mirror symmetry of the system which induces intermode scattering and resonances that depend on the width of the DG pnp junction. For ABC TLG the DG opens up a band gap which suppresses Klein tunneling. The DG induces also an unexpected asymmetry in the tunneling angle for single valley electrons

Development of an integrated heat pipe-thermal storage system for a solar receiver

The Organic Rankine Cycle (ORC) Solar Dynamic Power System (SDPS) is one of the candidates for Space Station prime power application. In the low Earth orbit of the Space Station approximately 34 minutes of the 94-minute orbital period is spent in eclipse with no solar energy input to the power system. For this period the SDPS will use thermal energy storage (TES) material to provide a constant power output. An integrated heat-pipe thermal storage receiver system is being developed as part of the ORC-SDPS solar receiver. This system incorporates potassium heat pipe elements to absorb and transfer the solar energy within the receiver cavity. The heat pipes contain the TES canisters within the potassium vapor space with the toluene heater tube used as the condenser region of the heat pipe. During the insolation period of the Earth orbit, solar energy is delivered to the heat pipe in the ORC-SDPS receiver cavity. The heat pipe transforms the non-uniform solar flux incident in the heat pipe surface within the receiver cavity to an essentially uniform flux at the potassium vapor condensation interface in the heat pipe. During solar insolation, part of the thermal energy is delivered to the heater tube and the balance is stored in the TES units. During the eclipse period of the orbit, the balance stored in the TES units is transferred by the potassium vapor to the toluene heater tube

Probing the two-scale-factor universality hypothesis by exact rotation symmetry-breaking mechanism

We probe the two-scale factor universality hypothesis by evaluating, firstly explicitly and analytically at the one-loop order, the loop quantum corrections to the amplitude ratios for O($N$) $\lambda\phi^{4}$ scalar field theories with rotation symmetry-breaking in three distinct and independent methods in which the rotation symmetry-breaking mechanism is treated exactly. We show that the rotation symmetry-breaking amplitude ratios turn out to be identical in the three methods and equal to their respective rotation symmetry-breaking ones, although the amplitudes themselves, in general, depend on the method employed and on the rotation symmetry-breaking parameter. At the end, we show that all these results can be generalized, through an inductive process based on a general theorem emerging from the exact calculation, to any loop level and physically interpreted based on symmetry ideas.Comment: 17 pages, 3 figure

NEREU Project: Construction of a Plasma Reactor for Reform of Greenhouse Gases for Treatment of Wastewater of the Marine Farms

The predatory exploitation techniques used for the supply of protein resources have been systematically causing the decrease in seafood. The solution was sought in the form of marine farms, for the purpose of production of fish and seafood. Brazil created an incentive production of seafood in order to increase seafood production. In 1998, the state governments joined the project, encouraging the creation of marine farms without an assessment of the impact on the environment. In 2005, after several records of seafood production in Santa Catarina started an epidemic of white spot shrimp, decimating several fishing farms. In Bahia came the disease lethargic crab, which simply decimated almost 90% of crabs those states. In 2010, the State Government of Bahia invested in research to combat this degradation of mangroves; the project had to in essence deal with the brown mare and help save the fishing industry of the state. It was based on these principles that Nereu project emerged, which provides for the rational and intelligent use of contaminated and hypersaline water of the marine farms from the production area of fish and seafood, in order to neutralize all pathogens and produce pure water with energy cogeneration

Analisa Pengaruh Panjang Pipa Spiral Katalis Hydrocarbon Crack System Untuk Penghemat Bahan Bakar Sepeda Motor 4 Tak Honda Mega Pro Terhadap Waktu Performa Mesin, Temperatur Dan Kebisingan

Sepeda motor yang hemat kaitanya bahan bakar irit. Banyak pabrikan sepeda motor yang mengeluarkan produk paling irit, tetapi mempengaruhi performa daya mesin. Sepeda motor bahan bakar irit dipilih karena harga bahan bakar yang mahal. Maka perlu inovasi pembuatan alat untuk penghematan bahan bakar untuk menaikan kinerja daya mesin. Tujuan penelitian ini membuat desain pipa katalis HCS model spiral dengan memanfaatkan uap bahan bakar pertamax Metode penelitian menggunakan variabel bebas putaran mesin, panjang pipa,dan volume pertamax. Variabel terikat dengan menguji waktu performa mesin, temperatur mesin, kebisingan, dan daya mesin sepeda motor Mega Pro 156.7 cc. Penambahan panjang pipa spiral katalis dan volume pretamax menambah waktu performa mesin. Panjang 500 cm dan 2000 ml volume pretamax pada kecepatan putaran mesin 2000 rpm mampu menghemat bahan bakar selama 27 detik atau 62,7%. Selain waktu performa mesin, desain pipa spiral katalis ini juga mengurangi temperatur 6oC atau 5%, dan kebisingan 4oC atau 5%. Bertambahnya pipa spiral katalis HSC dan volume pretamax dapat meningkatkan kandungan hidrokarbon bahan bakar yang masuk ke ruang pembakaran yang disuplay dari uap pretamax. Panjang pipa spiral katalis HCS 600 cm menurunkan waktu performa mesin, ini disebabkan daya vakum intake manifold berkurang karena panjangnya pipa katalis. Dan Nilai oktan tinggi mempengaruhi pembakaran mesin sempurna, knocking berkurang, temperatur mesin rendah, dan kebisingan menurun