The ohmmeter works well for large resistances (greater than a few 10s of ohms) and when it is possible for the probes to make good connections to the object. If the resistance is very small, it is difficult to make a good connection, or both, it is necessary to use a more complicated method to properly measure the resistance. The main problem in these two cases is that the resistance in the pro...

The ohmmeter works well for large resistances (greater than a few 10s of ohms) and when it is possible for the probes to make good connections to the object. If the resistance is very small, it is difficult to make a good connection, or both, it is necessary to use a more complicated method to properly measure the resistance. The main problem in these two cases is that the resistance in the pro...

The advantage of this method involves controlling the flow of current through all the connections – especially those used to measure the voltage. The measurement current flows through one set of connections, usually those that are farthest apart. If these connections are resistive (i.e., the connections are poor) there will be significant voltage drop across them. However, this voltage drop doe...

In the wireless sensor networks (WSNs) for electric field measurement system under the High-Voltage Direct Current (HVDC) transmission lines, it is necessary to obtain the electric field distribution with multiple sensors. The location information of each sensor is essential to the correct analysis of measurement results. Compared with the existing approach which gathers the location informatio...

The resistance of dual-gated bilayer graphene is measured as a function of temperature and gating electric fields in the Corbino geometry which precludes edge transport. The temperature-dependent resistance is quantitatively described by a two-channel conductance model including parallel thermal activation and variable range hopping channels, which gives the electric-field-dependent band gap wh...

The advantage of this method involves controlling the flow of current through all the connections – especially those used to measure the voltage. The measurement current flows through one set of connections, usually those that are farthest apart. If these connections are resistive (i.e., the connections are poor) there will be significant voltage drop across them. However, this voltage drop doe...

The ohmmeter works well for large resistances (greater than a few 10s of ohms) and when it is possible for the probes to make good connections to the object. If the resistance is very small, it is difficult to make a good connection, or both, it is necessary to use a more complicated method to properly measure the resistance. The main problem in these two cases is that the resistance in the pro...

The ohmmeter works well for large resistances (greater than a few 10s of ohms) and when it is possible for the probes to make good connections to the object. If the resistance is very small, it is difficult to make a good connection, or both, it is necessary to use a more complicated method to properly measure the resistance. The main problem in these two cases is that the resistance in the pro...

Electric potential measurement technique (tomography) was introduced as a nondestructive method to evaluate concrete properties and durability. In this study, numerical meshless method was developed to solve a differential equation which simulates electric potential distribution for concrete with inclusion in two dimensions. Therefore, concrete samples with iron block inclusion in different loc...