The invention relates to a greenhouse, specifically a closed greenhouse environment suitable for use in dry environments which regulates the conditions of the growing environment whilst minimising heat and water loss. The greenhouse is especially suitable for use with macrophyte growing systems.

The agricultural material includes a cellulose acylate layer and a polymer layer. The cellulose acylate layer is formed of cellulose acylate. The polymer layer is provided on a first CA surface, which is one surface of the cellulose acylate layer. The polymer layer has a moisture permeation resistance of at most 7.510.sup.4 m.sup.2.Math.day/g per 1 m of thickness and is formed of a polymer different from cellulose acylate. The agricultural material has a tear strength of at least 0.10 N.

Example implementations include a system and method of using plastic from bodies of water and creating a floating platform by collecting plastic from a body of water, cleaning the collected plastic, melting and compacting the plastic, molding a plurality of hexagonal blocks from the compacted plastic, stacking the plurality of hexagonal blocks, wherein a system of springs and an energy storage device is provided between each of the plurality of hexagonal blocks, and coating the stacked blocks with a non-toxic material. Through the use of various onboard functionalities, energy may be generated to regulate temperature and provide electricity, oxygen may be supplied, and water may be purified.

The friction clamp includes a cylindrical body of elongate form between ends and with a slot into which a tubular item is snapped. Lateral connectors such as a receiver with a cylindrical recess therein receive an end of a tubular member, such as a member similar to that which snaps into the slot. As an alternative to the receiver, a tab is provided extending from the clamp laterally. The tab includes a hole through which hardware is placed, and an item having a similar tab is placed adjacent to the tab extending from the clamp and the hardware tightened for fixation at a desired rotational orientation. As another alternative to the receiver, a small friction clamp connector is provided on an exterior of the friction clamp. A small rod (or other item) snaps into the small clamp. The small clamp and rod can be provided separate from the friction clamp.

To provide a polycarbonate resin having an excellent hue and high heat stability, and a production method and a film thereof. The polycarbonate resin has a carbonate constituent unit represented by the following formula (A), wherein the resin contains a terminal group represented by the following formula (1) or (2) and 0.1 to 500 ppm of an aromatic monohydroxy compound. ##STR00001## (In the formula (1), R.sub.1 is an alkyl group having 6 to 15 carbon atoms which may be substituted.) ##STR00002## (In the formula (2), R.sub.2 and R.sub.3 are each independently an alkylene group having 1 to 12 carbon atoms which may be substituted. R.sub.4 is a hydrogen atom or alkyl group having 1 to 12 carbon atoms which may be substituted. n is an integer of 1 to 20.)

Greenhouse comprised of a ridge beam extending some distance above its roof defining two elongated side zones at either side of the ridge beam. The ridge beam is comprised of one or more elongated hollow spaces and with one or more closable openings in both side zones. The openings fluidly connect the exterior of the greenhouse with its interior and may be closed at one side and opened at its other side depending on the direction of the wind.

A resin composition contains an ethylene-vinyl alcohol copolymer (A) in which an ethylene unit content is from 10 to 60 mol %, a hindered amine-based compound (B) having a 2,2,6,6-tetraalkylpiperidine ring structure and having an alkoxy group bonded to a nitrogen atom in the structure, and a hindered phenol-based compound (C) having an ester bond or an amide bond. The resin composition contains 0.1 to 5 parts by mass of the hindered amine-based compound (B) and 0.2 to 5 parts by mass of the hindered phenol-based compound (C) with respect to 100 parts by mass of the ethylene-vinyl alcohol copolymer (A), and a mass ratio (C)/(B) is from 0.2 to 3.6.

An agricultural fluorine-resin film and a greenhouse that can increase yield of crops even in high-eave houses are provided.

In the agricultural fluorine-resin film containing fluorine-resin, one surface has an uneven surface 1a, a transmittance at a wavelength of from 300 to 800 nm is from 20% to 70%, and a transmittance T.sub.2 below is 75% or more.

Transmittance T.sub.2: Transmittance of a laminate at a wavelength of from 300 to 800 nm, obtained by laminating the resin film and a test film, in which the uneven surface 1a of the resin film is completely filled with water, and the test film which has a thickness of 50 m, is formed of only an ethylene-tetrafluoroethylene copolymer, and has a transmittance at a wavelength of from 300 to 800 nm of 94% and an arithmetic average roughness Ra of both surfaces of 0.04 m is laminated on the resin film.

A greenhouse has a roof including a plurality of substantially parallel crossbeams, at least two longitudinal sections which are mounted to the crossbeams and extend at a distance from each other in transverse direction of the crossbeams, a transparent foil which is mounted to the longitudinal sections at respective foil attachment locations thereof so as to form a cover between the longitudinal sections. The roof also includes a displacement mechanism for displacing one of the longitudinal sections with respect to the other between a non-foil-stretching position and a foil-stretching position. The distance between the respective foil attachment locations is larger in the foil-stretching position than in the non-foil-stretching position. The displacement mechanism can be operated and is lockable at an upper side of the roof.

A growing device for propagation and germination of plants, the device having a transparent dome positioned over a transparent propagation tray contained within an opaque catch tray and a locking mechanism for rigidly connecting the transparent dome with both the transparent propagation tray and the catch tray.