Selective obturator neurotomy is a commonly used neurosurgical intervention for spastic cerebral palsy with scissors gait. Here we report the use of surface electromyography to assess the accuracy and effect of selective obturator neurotomy procedures. Selective obturator neurotomy was carried out on 18 patients while using intraoperative electromyography. Contractions of adductor muscles were recorded by electromyography before and after neurotomy and assessed using root mean square and integrated electromyography tests. Passive and voluntary movements were recorded for all patients. Our results show that adductor spasms and adductive deformity of hip were improved in all patients with spastic cerebral palsy. Adductor muscle spatiality was improved significantly, confirmed by a significant decrease in the values of root mean square and integrated electromyography in both passive and voluntary movements after surgery. We show that electromyography is an effective tool for accurately and safely targeting nerve tracts during selective obturator neurotomy. Thus, we demonstrate a valuable noninvasive method to objectively evaluate the effect of treatment in spastic cerebral palsy patients.

In order to study the effect of the charge diameter on the slow cook-off (SCO) performance of HMX (cyclotetramerthylenetetranitramine) based explosives, a typical cyclotetramerthylenetetranitramine based explosive was used as the research object, and the effect of the different charge diameters on the slow cook-off performance was studied. The research results show that: the charge diameter has no significant effect on the response level of the cyclotetramerthylenetetranitramine based explosives. The reaction time and ambient temperature increase with the increase of the charge diameter, and the center temperature decreases with the increase of the charge diameter. The ambient temperature and the center temperature change regularly with the increase of the charge diameter.

A testing system was established to measure at 71°C the expansion pressure of a thermoplastic explosive with different charge quantities and of thermoplastic explosives with the same charge quantity but different formulations. It is indicated that the growth of expansion pressure of the thermoplastic explosive is non-linear with the increase rate of the charge quantity. And the expansion pressure has the possibility of decreasing when the charge quantity reaches a certain value. The expansion pressure will vary remarkably with the selection of polymer materials with differed dynamic mechanical properties as additives.

The ignition and detonation process of non-ideal explosives is orders of magnitude different from that of ideal explosives on the time scale, which makes non-ideal explosives have a longer growth distance when subjected to shock stimulation, and the ignition growth process of non-ideal explosives is strongly dependent on external conditions, and the process involves complex physical and chemical changes of explosive materials, and today's technology cannot accurately characterize it. In order to study the ignition growth characteristics of non-ideal explosives below the critical initiation pressure, by measuring the pressure change process in the explosive inside the sample tube during the deformation stage of the shock wave sensitivity, it is found that the internal pressure of the explosive first increases and then decays. Therefore, it is judged that when the critical initiation pressure of the explosive is lower than the critical ignition pressure, the non-ideal explosive still has the next critical ignition pressure. This lower pressure can cause the ignition reaction in the non-ideal explosive to occur locally and form a pressure increase phenomenon in the explosive.