摘要:
A method and apparatus for the ablation of hard biological material, such hard dental material, using a rapidly pulsed laser employ a crystal disposed in the propagation path of the laser radiation, the crystal being disposed at the laser output and serving as an interface with an optical conductor which conveys the laser radiation to the treatment site. The crystal smooths the time/intensity characteristics of the pulsed laser radiation to the extent that transmission to the treatment site using optical wave guides is possible. Additional protective features are provided to prevent the ablated biological material to destroy the exposed optical end surfaces of the treatment applicator. Additional design features improve the ergonomic efficiency of the handpiece and its ability to be sterilized.
摘要:
A process of controlling the course of a program in form processing by data processing systems for data contents of a form (80, 81, 82) built of fields to be processed. The pictorial illustration (display of the form (80, 81, 82), the reading and fading in of the data relevant for this form, the manipulation of these data by the user and the processing of these data arranged by the user by a firmly assigned form processing program to the form after selection of a form specification. The form processing program is composed here, under predetermination of the actual form specification, according to the available fields, gradually of individual programs which are typical for the field.
摘要:
The invention is a process for the preparation of elastic polyurethane flexible foams having densities from approximately 25 to 60 kg/m.sup.3, and producing molded articles in closed molds at temperatures from 25.degree. to 80.degree. C., comprising reacting(A) an organic polyisocyanate prepolymer having an isocyanate content from 6 to 20 percent by weight prepared by reacting a toluene diisocyanate and/or a diphenylmethane diisocyanate with a di- to tetrafunctional polyether polyol having a hydroxyl number from 20 to 50 and oxyethylene terminal group content of at least 10 to 30 percent by weight(B) a mixture of compounds containing reactive hydrogen atoms, comprising a mixture of(a) from 55 to 89.5 parts by weight of at least one di- to tetrafunctional polyether polyol having a hydroxyl number of from 20 to 80 and less than 10 percent by weight terminal oxyethylene groups,(b) from 0.5 to 20 parts by weight of at least one alkanolamine, and(c) from 10 to 25 parts by weight water, in the presence of(C) a blowing agent,(D) a catalyst, and optionally(E) auxiliaries and/or additives.
摘要翻译:本发明是制备密度为约25至60kg / m 3的弹性聚氨酯柔性泡沫体的方法,并且在封闭模具中在25℃至80℃的温度下生产模制品,其包括使(A)有机多异氰酸酯 预聚物的异氰酸酯含量为6〜20重量%,其通过使甲苯二异氰酸酯和/或二苯基甲烷二异氰酸酯与羟基数为20至50的二至四官能团聚醚多元醇反应制备,氧乙烯基端基含量为至少10至 30重量%(B)含有反应性氢原子的化合物的混合物,其包含(a)55至89.5重量份的至少一种羟基数为20至80的二官能或四官能团聚醚多元醇的混合物,以及 末端氧乙烯基少于10重量%,(b)0.5至20重量份的至少一种链烷醇胺,和(c)10至25重量份的水, (C)发泡剂,(D)催化剂和任选的(E)助剂和/或添加剂。
摘要:
The invention contemplates dose-integrating instrumentation which relies upon continuously monitoring the illuminance level of a small sampling fraction of the total projected-light flux of the field-illuminating system of an operating microscope, the sampling being optionally within the projection system, or taken elsewhere. The sampled illuminance is in the form of an electrical signal which is continuously time-integrated to provide a continuous display of the dosage as it builds in the course of an operative procedure. Provision is made for the surgeon to preset what he chooses to be the safe upper limit of integrated exposure, beyond which he does not wish to go for fear of possible jeopardy to the retina of his patient, and the instrument continuously indicates the remaining time for him to complete his operation, should he continue at the current level of illumination. The instrument also provides a succession of different indications throughout the progress of the operation, as successive predetermined thresholds of building dosage (exposure) are reached.
摘要:
A flat-weft knitting machine for producing a weft-and-warp-knit fabric, e.g., a stitch knitting machine, employs a weft yarn insertion device, which moves backward and forward, for constantly guiding a continuous thread or yarn group. The insertion device transfers one weft yarn group of the yarn group to first and second weft yarn conveyor means. The weft yarn group is then separated from the insertion device and the yarn group. The weft yarn group thus has free ends at both ends and is then conveyed by the weft yarn conveyor means to a looping point, for connection with loop-forming warp yarns to form a fabric.
摘要:
Organic materials which contain from 0.001 to 10% by weight of an aminoreductone I ##STR1## where R.sup.1, R.sup.2 and R.sup.3 are H, methyl or ethyl and R.sup.4 is the radical of a naturally occurring .alpha.- or .beta.-aminoacid or of a C.sub.1 -C.sub.10 -alkyl ester thereof or, in the case of an .alpha.-aminoacid, a lactone having a 2--OH group in the cyclohexenone ring, or R.sup.4 is C.sub.1 -C.sub.20 -alkyl which is unsubstituted or substituted by --OH, C.sub.1 -C.sub.4 -alkoxy or C.sub.1 -C.sub.4 -acyloxy, or is --(CH.sub.2 --CH.sub.2 --O).sub.n H, which may be etherified with a C.sub.1 -C.sub.4 -alkanol or esterified with a C.sub.1 -C.sub.4 -fatty acid, and where n is from 2 to 10, or a mineral salt thereof.Novel compounds Ia differ from I in having the radical R.sup.4a, where R.sup.4a is R.sup.4 with the exception of methyl. Compounds I are prepared by reacting the corresponding 2,3-dihydroxycyclohex-2-en-1-one with an amine HN(R.sup.3)R.sup.4 or a mineral acid salt thereof.
摘要:
A device and method for testing a fiber-composite component, which is to be processed by means of bonding, for the presence of at least one substance out of a selection of possible contaminants. A surface heating device for regional heating of a part-zone of the fiber-composite component to be bonded is performed for desorption of contaminants. A sensor array with a plurality of sensors detects contaminants in the gas phase, and a control device ascertains and signals contaminations which are found. An extractor device can be employed to extract machining dust from the fiber-composite component to a desorption device.
摘要:
Embodiments of the invention provide for polyurethane binders or adhesives that result in an increased amount of renewable resources in the final composite products while yet maintaining the quality of the composite products.
摘要:
Microthruster includes a combustion chamber comprising a substrate material, a fuel inlet, and a gas outlet. A first resistance heater is arranged in the combustion chamber. A catalyst is structured and arranged to decompose fuel entering the combustion chamber. First substrate material sections are heated by the first resistance heater to at least one of a predetermined temperature and a predetermined temperature range.
摘要:
The invention relates to an optical module, comprising a semiconductor element having a surface that is sensitive to electromagnetic radiation and an objective for projecting electromagnetic radiation onto the sensitive surface of the semiconductor element (image sensor or camera chip, in particular CCD or CMOS). The objective preferably comprises at least one lens and one lens retainer.In the optical module, an optical element having two sub-areas is arranged either in the space between the objective and the sensitive surface of the semiconductor element or between individual lenses of the objective in the entire cross-section of the beam path. All electromagnetic radiation that reaches the sensitive surface of the semiconductor element passes through the optical element.A first distance range (e.g. near range) is imaged in a first area of the sensitive surface of the semiconductor element in a focused manner by a first sub-area of the optical element, and a second distance range (e.g. far range) is imaged in a second area of the sensitive surface of the semiconductor element by a second sub-area.