摘要:
A method for determining the concentration of sugar in the presence of interfering foreign substances, particularly for determining glucose in a body fluid, by means of an electrocatalytic sugar sensor which has a measuring electrode in which the measuring electrode is alternatingly set potentiostatically to a reactivation and a measuring potential and the current flowing during the measuring period is evaluated as the measurement signal. To prevent foreign substances from exerting an interfering influence and thereby permit a sensitive sugar determination which is reliable over an extended period of time, a hydrophilic diaphragm is arranged in front of the measuring electrode to impede the resupply of the interfering foreign substances to the measuring electrode so that a diffusion limit current adjusts itself during the reactivation phase in the oxidation of the foreign substances; and the current is evaluated with a time delay relative to the start of the measuring period.
摘要:
A method for determining the concentration of sugar in the presence of interfering foreign substances, by means of a test electrode with a membrane placed in front of it, the electrode being contained in an electrocatalytic sugar sensor, whereby the test electrode is set potentiostatically to a reactivation potential and to a test potential and the current flowing during the set test period is evaluated as a test signal. The invention formulates a method such that with varying concentrations of urea a sensitive determination of sugar concentration which is reliable over a long term is achieved. The invention discloses the method which includes the step that after the reactivation potential and prior to the test potential a third potential that is more negative than the test potential is applied to the test electrode. The technique proposed in the invention is particularly appropriate for the determination of the concentration of glucose in body fluids.
摘要:
For determining the urea concentration in liquids in continuous operation, with a high sensitivity and reliable determination of the urea content over an extended period of time, an electrode which is separated from the urea containing liquid by means of a diaphragm with a diffusion coefficient of less than 10.sup.-7 cm.sup.2 s.sup.-1 for urea has impressed on it potentiostatically and cyclically, two potential values, the more positive potential being between 0.9 and 2.0. V/H.sub.2 rev, and the more negative potential being lower than 0.6 V/H.sub.2 rev, and at the more positive potential, the current flowing within a predetermined time interval is evaluated as the measuring signal.
摘要翻译:为了在连续操作中确定液体中的尿素浓度,在长时间内具有高灵敏度和可靠地测定尿素含量的电极,通过具有扩散系数较小的膜片与含尿素的液体分离的电极 对于尿素来说,10-7 cm2 s-1对电位和周期性影响,两个潜在值,正电位在0.9和2.0之间。 V / H2rev,负电位低于0.6V / H2rev,在正电位下,将在预定时间间隔内流动的电流作为测量信号。
摘要:
For determining the urea concentration in liquids in continuous operation, with high sensitivity and reliable determination of the urea content over an extended period of time, an electrode which is separated from the urea containing liquid by means of a diaphragm with a diffusion coefficient of less than 10.sup.-7 cm.sup.2 s.sup.-1 for urea has impressed on it potentiostatically and cyclically, two potential values, the more positive potential being between 0.9 and 2.0. V/H.sub.2 rev and the more negative potential being lower than 0.6 V/H.sub.2 rev, and at the more positive potential, the current flowing within a predetermined time interval is evaluated as the measuring signal.
摘要翻译:为了在连续操作中确定液体中的尿素浓度,在长时间内具有高灵敏度和可靠地测定尿素含量的电极,通过具有扩散系数小于10nm的膜片与含尿素的液体分离的电极 对于尿素,10-7 cm2 s-1对其进行了静电和循环印迹,有两个潜在值,正电位介于0.9和2.0之间。 V / H2rev,负电位低于0.6V / H2rev,在正电位下,将在预定时间间隔内流动的电流作为测量信号。
摘要:
A method for the manufacture of electrodes for electrochemical cells, is provided in which a Raney rare-metal catalytic layer is disposed on a metallic support structure in layer form. According to the invention, the Raney rare-metal catalytic layer is prepared by dissolving the inactive component of a layer, disposed on the support structure, of a homogeneous alloy of at least one of the metals of the platinum group of the periodic system of the elements as the active component and at least one of the metals of the iron group of the periodic system of the elements as the inactive component; the content of inactive component being at least 65 atom-percent.
摘要:
A turbomachine has a first process control element, a second process control element, and a test system for testing the first process control element. The first process control element and the second process control element influence the same process variable. To test the first process control element, the test system changes the process variable by means of the second process control element. This change in the process variable caused by the second process control element is compensated again by means of the first process control element.
摘要:
A process is provided for protecting stored operating data of machinery or similar equipment. The operating data are stored by means of a computer system belonging to a control system or by means of a similar computer system belonging to the equipment and wherein the operating data are acquired continuously in the form of data sets and stored in a data storage medium for later analysis. A security code is generated with the storage of a data set from the currently stored operating data on the basis of parameters (k, l, m, n) of a preset determination rule and stored in the computer system. A comparison code is determined in at preset time intervals on the basis of the same determination rule from the operating data currently recorded in the data storage medium for verifying the operating data currently present in the data storage medium. The comparison code is compared with the security code generated originally, and a warning signal is generated or a protective action is triggered in a fourth step in case of a deviation between the comparison code and the security code generated originally.
摘要:
Discharging the reaction water from the novel PEM fuel cells does not require humidification of the reaction gases or an increase in the gas pressure. This is attained in that a hydrophobic layer on the cathode side is used which has a smaller pore size than the layer on the anode side. The reaction water is removed via the anode during the operation of the fuel cell.
摘要:
A method and a device are provided for specifying, in the context of the image generation of ISAR processing, the determination of the aspect angle course subject to which the radar illuminates the vehicle during the exposure and subject to which the vehicle echoes are reflected back to the radar. Using the distance between the radar sensor and the vehicle as well as the change in distance, both of which are determined from the radar data, the position and the velocity of the vehicle are determined at any time during the exposure through linkage with available road information. The aspect angle is then determined from the positions of the sensor and of the vehicle as well as from the direction of movement of the vehicle. The required road information can be acquired from digital maps or images (e.g. aerial photographs, SAR-images).
摘要:
A digital arrangement for controlling a gas or steam turbine in which operating parameters of the turbine are sensed at a regular rate. Control parameters are then calculated from the operating parameters by at least one control and regulating program with predetermined reference values. The turbine is controlled and monitored in operation, in accordance with the calculated control parameters for the purpose of safeguarding against excess speed or surging. At least two computer systems are operated in parallel and at different speeds, and communications prevail between these two computer systems. The first of the computer systems is operated at a substantially rapid rate and with a limited supply of commands, together with an individual control and regulating program having a set of reference values. The second computer system is operated at a slower rate than the first computer system and with a greater supply of commands. The second computer system is operated with a plurality of control and regulating approaches and sets of reference values. Predetermined operating parameters are acquired by the first computer system for calculating control parameters and transmitting the calculated control parameters to the turbine. A new control and regulating program is selected by the second computer system when operation of the turbine is changed.