摘要:
A divalent metal stannate product having a loss on ignition of 2-17 % by weight, e.g. a product intermediate ZnSn(OH)6 and ZnSnO3 has advantageous flame-retardant properties, for use e.g. in polymer formulations.
摘要:
An aluminium alloy in the AA5XXX series has the composition: Si 0.10-0.25 %; Fe 0.18-0.30 %; Cu up to 0.5 %; Mn 0.4-0.7 %; Mg 3.0-3.5 %; Cr up to 0.2 %; and Ti up to 0.1 %. Rolled and annealed sheet of the alloy is readily formed into shaped components for use in vehicles which components have good strength and resistance to stress corrosion cracking.
摘要:
A stereo-endoscope, by which two perspective views of an objective field are viewed, is provided. A divergent optical arrangement, positioned between the object field and two objective lenses, each of which forms a respective image of the object field, reduces the disparity between corresponding points in the two image fields, where such disparity is caused by distortion of the image formed.
摘要:
There is disclosed a toothpaste comprising as an abrasive an alumina in the form of particles having d10 below 3.5νm, d50 below 1.0νm and a specific surface area below 6m2/g.
摘要:
An aqueous, two component system for coating a substrate includes either a filler incorporated in both components prior to combining the components or an elevated amount of a filler, such as 50% by dry volume, in either component. The filler is preferably calcium carbonate, but may also be selected from titanium dioxide, sand, clay, mica, dolomite, silica, talc, perlite, gypsum, wallastonite, aluminum trihydrate, zinc oxide, barium sulfate, zinc sulfate, and combinations thereof. The first component includes a first polymer containing hydroxyl functional groups or amine functional groups and, optionally, a catalyst, preferably an organotin catalyst. The first polymer is selected from a polyester polyol, an acrylic polyol, a urethane polyol, a polyother polyol, a polyamine, an aldimine, a short oil alkyd, a silicone polyol, a cellulose ester, a vinyl polyol, and combinations thereof and preferably is a polyaspartic ester. The second component includes a second polymer which is polyisocyanate containing isocyanate functional groups. The coating can be applied by applying to the substrate the first component then separately applying the second component shortly thereafter. Alternatively, the components can first be mixed then applied to the substrate as a mixture.
摘要:
There is disclosed an adaptive material (1) comprising a sheet, a plurality of members (4) having regions with different electromagnetic radiation absorbing and/or reflecting properties movably retained on or within the sheet such that portions of the members (4) are visible through apertures (3) in the sheet when the material is viewed in a direction perpendicular to the plane of the sheet and means for moving the members (4) such that different portions thereof become visible through the apertures (3). The overall appearance of the material is thereby changed. Also disclosed is an adaptive material in which the overall permeability of the material can be changed.
摘要:
The present invention describes a method for the selection and temporal expression of heterologous genes. The invention consists of methods to obtain selective and temporal expression of heterologous genes in target tissues. Promoters inducible by photodynamic therapy or heat are used to express genes of interest under conditions of heating or Photodynamic Therapy-(PDT-) induced oxidative stress. Selective and temporal expression of heterologous genes (such as cytokines, toxins, tumor suppressor genes, antisense molecules and anti-angiogenic factors) are of significant therapeutic benefit in the treatment of tumors, vascular proliferation and tissue hypertrophy. Gene therapy targeted by laser induced heating, other heating sources (such as microwave, ultrasound or radiofrequency induced currents), or PDT enhances treatment effectiveness by inducing expression of therapeutic genes in a controlled and localized manner.