An electrical energy generation system can include a housing, an electrical generator supported by the housing, a turbine operatively connected to the electrical generator, and a hollow frustum positioned in the housing and spaced apart from the turbine. The frustum can be configured to receive airflow via a lower opening and to direct the airflow toward the turbine with increased velocity. Another electrical energy generation system can include an electrical generator, a turbine operatively connected to the electrical generator, and an enclosed passageway configured to increase a speed of an airflow from an artificial source toward the turbine. The enclosed passageway can be positioned to support the turbine. The systems can include one or more baffle elements to straighten the airflow along a direction aligned with a rotational axis of the turbine. Electrical energy generation systems harvest waste or exhaust air from rooftop vent or fan assemblies.

This heat recovery device replaces the floor drain in a common residential shower. A large circular pan joins flush with the shower stall floor and funnels greywater into the drain piping. The circular pan contains the heat transfer device which preheats the incoming cold water and recovers approximately half of the heat that would otherwise be lost. The incoming cold water travels through a water turbine where it rotates an impeller. The impeller is magnetically coupled with a rotary whisk. The rotary motion continuously washes the draining greywater over a spiral warming coil. The spiral coil transfers the heat to the incoming fresh water as it travels to the shower's mixing valve.

An electricity generator is mounted on an air exhaust port of a cooling tower and contains a delivery pipe and a wind turbine. The delivery pipe includes an air inlet and an air outlet opposite to the air inlet, and the air inlet corresponds to the air exhaust port of the cooling tower. The wind turbine includes a power generation device and a propeller rotatably connected with the power generation device and housed between the air inlet and the air outlet of the delivery pipe. Preferably, the delivery pipe is connected with the air exhaust port so that when the cooling tower operates, hot air exhausts from the air outlet via the air inlet.

A power generation apparatus using a head of wastewater in a building includes an inclined water discharge pipe connected to an end of a wastewater pipe installed in the building through one end thereof, to divert a moving path of wastewater falling through the wastewater pipe, a cavity part coupled to the other end of the inclined water discharge pipe, to receive the wastewater discharged through the other end of the inclined water discharge pipe, and a rotating body installed inside of the cavity part, to be rotated by the wastewater discharged through the other end of the inclined water discharge pipe. Power is generated using a head of wastewater generated in a high-rise building or an apartment, and electricity generated using the wastewater is used as common electricity inside/outside the building. Therefore, smooth power supply can be achieved.

A high building power generation device includes a plurality of water storage tanks and at least one power generation unit. The water storage tanks are arranged at specific floors of a high building so that a predetermined vertical distance is provided between adjacent ones of the water storage tanks. The water storage tanks are connected to each other with pipes. A control valve is mounted at a connection of each water storage tank with the pipes. The power generation unit is arranged at a bottom floor of the high building. The pipes connecting with the water storage tanks have a lower opening that is located above the power generation unit. The water storage tanks accumulate and store used water from multiple floors and the control valves are openable to release the used water to impact and drive the power generation unit to generate electrical power.

An electrical energy generation system can include a housing, an electrical generator supported by the housing, a turbine operatively connected to the electrical generator, and a hollow frustum positioned in the housing and spaced apart from the turbine. The frustum can be configured to receive airflow via a lower opening and to direct the airflow toward the turbine with increased velocity. Another electrical energy generation system can include an electrical generator, a turbine operatively connected to the electrical generator, and an enclosed passageway configured to increase a speed of an airflow from an artificial source toward the turbine. The enclosed passageway can be positioned to support the turbine. The systems can include one or more baffle elements to straighten the airflow along a direction aligned with a rotational axis of the turbine. Electrical energy generation systems harvest waste or exhaust air from rooftop vent or fan assemblies.

Sequence specific DNA amplification and analysis techniques are provided. In some aspects, methods of the embodiments comprise amplifying sequence from two regions of a target sequence in the presence of a blocking oligonucleotide (e.g., such as a phosphorothioate-containing oligonucleotide) that hybridizes to the target sequence between the two regions. In some specific embodiments, a method is provided for detecting bacteria (such as detecting gram-positive or gram-negative bacteria) in a biological sample using polymerase chain reaction (PCR).