Abstract:
Adenosine and xanthine derivatives, and compositions comprising those compounds, are potent selective agonists and antagonists of adenosine receptors. The derivatives and compositions are used to treat conditions, including certain cardiac arrhythmias.
Abstract:
A pressure gauge is provided comprising a sensor housing (1) closed by a cover (7). The sensor housing (1) is connected to a tube (3) containing the pressure to be measured. The space defined by the sensor housing (1) and the cover (7) is hermetically divided by a sensor housing cover (9) in such a way that inside a front measurement volume (11) a pressure sensor means (15) is placed. This pressure sensor means has a substantially flat shape. It is connected to the interior walls of the front volume by means of tubes (23) which are slender or slim, that is have a small section in relation to the area of the pressure sensor means (15). The carrying means (23) are preferably realized as metal tubes and in their interior the electrical connections (31) for the pressure sensor means pass. By this construction the exterior surface of the whole of the pressure sensor means (15) will be subjected to the measuring pressure. Further an attachment to the pressure sensor housing is provided only allowing a slight convection of heat and in addition the measuring volume does not contain any chemically unstable materials. The electrical connections are also well protected against corrosion by the measurement medium and obtain an electrical shielding.
Abstract:
A chemical heal pump includes a reactor part (1) that contains an active substance and an evaporator/condenser part (3) that contains that portion of volatile liquid that exists in a condensed state and can be absorbed by the active substance. A channel (4) interconnects the reactor part and the evaporator/condenser part, In at least the reactor part a matrix (13) is provided for the active substance so that the active substance both in its solid state and its liquid state or its solution phase is hold or carried by or bonded to the matrix. The matrix is advantageously an inert material such as aluminium oxide and has pores, which are permeable for the volatile liquid and in which the active substance is located. In particular, a material can be used that has a surface or surfaces, at which the active substance can be bonded in the liquid state thereof. For example, the matrix can be a material comprising separate particles such as a powder or a compressed fibre material.
Abstract:
A capacitive vacuum measuring cell includes first and second ceramic housing bodies (1, 4) joined by an edge seal (3). A thin ceramic membrane (2) is supported between first and second housing bodies (1, 4) by the edge seal (3) at a small distance from the first housing body (1) creating a reference vacuum chamber (25) therebetween. An electrically conductive material (7) coats opposing surfaces of the first housing body (1) and the membrane (2) to form a capacitor. A measurement vacuum chamber (26) is provided between the membrane (2) and the second housing body (4). A port (5) communicates with the second housing body (4) to connect the measurement vacuum chamber (26) of the measuring cell to the medium to be measured. The membrane (2) is made from an Al2O3 slurry that is sintered in a first heating step, cooled, and then reheated to smooth the membrane.
Abstract translation:电容式真空测量单元包括通过边缘密封件(3)连接的第一和第二陶瓷壳体(1,4)。 薄壁陶瓷膜(2)通过边缘密封(3)在与第一壳体(1)相距很小的距离处被支撑在第一和第二壳体(1,4)之间,从而在它们之间形成参考真空室(25)。 导电材料(7)涂覆第一壳体(1)和膜(2)的相对表面以形成电容器。 在膜(2)和第二壳体(4)之间设置测量真空室(26)。 端口(5)与第二壳体(4)连通,将测量室的测量真空室(26)连接到待测介质。 膜(2)由在第一加热步骤中烧结的Al 2 O 3浆料制成,冷却,然后再加热以使膜平滑。
Abstract:
A capacity pressure sensor having a housing and a diaphragm. The housing and the diaphragm are substantially flat and are connected to each other at an upstanding border at the periphery of the housing. In the hermetically closed space between the housing and said diaphragm a reference pressure is applied. In a pressure measurement the diaphragm is bent inwards relative to said housing depending on the pressure acting on the surface of said diaphragm. This bending inwards is a primary output signal which capacitively can be converted to an electrical signal. Inside the pressure sensor on the inner surfaces of said housing and said diaphragm there are arranged, for the detection of the position of said diaphragm relative to said housing, capacitor plates connected to an electrical measuring circuit for detection of the capacity of the capacitor formed thereby. To enhance the linearity of the measuring capacitor the outer flat surfaces of the pressure sensor are coated with conducting layers connected to earth. Furthermore, in the housing a recess is arranged which when given suitable dimensions further reduces the deviation of the pressure sensor from the desired linear characteristic.
Abstract:
A chemical heat pump includes a reactor part (1) that contains an active substance and an evaporator/condenser part (3) that contains that portion of volatile liquid that exists in a condensed state and can be absorbed by the active substance. A channel (4) interconnects the reactor part and the evaporator/condenser part. To heat the reactor part, a portion of this wall is arranged as a solar energy collector, which can result in a very compact structure. In at least the reactor part a matrix (13) is provided for the active substance so that the active substance both in its solid state and its liquid state or its solution phase is held or carried by or bonded to the matrix. The matrix is advantageously an inert material such as aluminium oxide and has pores, which are permeable for the volatile liquid and in which the active substance is located. In particular, a material can be used that has a surface or surfaces, at which the active substance can be bonded in its liquid state thereof. For example, the matrix can be a material comprising separate particles such as a powder or a compressed fibre material.
Abstract:
In a chemical heat pump a substance is used which within the temperature range for which the heat pump is intended has a transition between a solid phase and a solution phase. The substance can for a solar driven chemical heat pump comprise magnesium chloride hexahdrate. In an accumulator part of the heat pump a heat exchanger (21) is provided enclosed by a net (23). The solid phase is primary located inside the net in contact with the heat exchanger while the solution phase flow out of the net and is collected in space (24′) below the heat exchanger. From this space the solution phase is pumped and sprayed over the heat exchanger from a spray bar (25). Thereby, all the time equilibrium is maintained. The advantage including the constant temperature step and the relatively large energy content of solid substance is thereby combined with the high power of liquid substances. Such a chemical heat pump is among other things suitable for converting low grade heat energy such as solar energy to cooling and in some cases also for a simultaneous production of heat.
Abstract:
Adenosine and xanthine deriviatives, and compositions comprising those compounds, are potent selective agonists of adenosine receptors. The derivatives and compositions are used to treat conditions, including certain cardiac arrhythmias.
Abstract:
Adenosine and xanthine derivatives, and compositions comprising those compounds, are potent selective agonists and antagonists of adenosine receptors. The derivatives and composition are used to treat conditions, including certain cardiac arrhythmias.
Abstract:
A space is cooled by gasifying or vaporizing a first, preferably liquid substance in a first container located in said space. The gas or vapor thus formed is conducted into a second container located outside the space and containing a second substance generating a lower gas pressure than said first substance at the same temperature, preferably by being chemically bound thereby. Said gas or vapor is absorbed by the second substance, which shall possess the quality of forming a porous, substantially rigid body in its container after heating or regeneration in vacuum. The second substance is comprised of sodium sulphide, at least as its major ingredient.Additionally an apparatus for carrying out this method comprises a first container which contains a gasifiable or vaporizable substance and is located in a space to be cooled, at least one second container which is located outside this space, and conduits which comprise a shut off valve and connect said first container with said second container which contains a second substance, which generates a lower gas pressure than said first substance at the same temperature and has the ability of absorbing gas emitted or generated by said first substance. The second substance is comprised of sodium sulphide, at least as its major ingredient.