Search

ObjectivesElectromagnetic pulse can seriously affect and even destroy naval shipborne electronic information systems, weapons, equipment and so on. Due to the complexity of the antenna port load circuit, it is necessary to formulate a numerical method which can easily obtain the antenna load current.MethodsThe induced current of the terminal is obtained on the basis of the finite-difference time-domain (FDTD) and Holland model. According to the Thévenin equivalent circuit, the conductor is equivalent to the voltage source to realize decoupling between the conductor and load end, and the load circuit is solved using Simulink software.ResultsCompared with the traditional terminal model, this method is simple and feasible for high-order circuit processing. The effectiveness of the model is verified using non-linear elements and parallel capacitors and resistors as the load respectively. The results show that the calculation results of this method are consistent with those of the traditional methods. Finally, the antenna of the end-connected protector is calculated. The results show that the lead inductance caused by the installation of the protector is an important factor affecting the protection performance.ConclusionsThe method proposed in this paper can greatly reduce the simulation complexity of the coupling current of an antenna with a complex load, giving it useful reference value for the field of ship electromagnetic pulse protection design.

In order to test the effects of the crude extracts from Rhodobacter sphaeroides (CCRS) on the volatile flavor substances and flavor amino acids of sausages during storage, the sausages were respectively processed with addition of CCRS at higher, medium and lower concentrations. Sausage processed without addition of CCRS was used as control. The volatile flavor substances and free amino acids were respectively analyzed using headspace solid-phase micro-extraction gas chromatography mass spectrometry (HS-SPME-GC-MS) and amino acid analyzer. The experimental results showed that a total of 36 volatile flavor substances were detected by GC-MS, including 17 alcohols, 1 ester, 10 aldehydes, 2 acids, 3 alkanes and 3 other components, among which 8 substances were considered the main flavor substances. Multivariate statistical analysis showed that the content and types of alcohols in sausages added CCRS were lower than those in control after 3 months storage. After 6 months storage, the alcohol content in the sausages with CCRS was higher than that of the control. However, the aldehyde content of the sausages with CCRS was lower than that of the control. Moreover, the CCRS promoted the production of ethenyl hexanoate, which was the only one ester in the sausages. On the other hand, the addition of low concentration of CCRS reduced the content of heptaldehyde, octanoic acid and other odor substances. Amino acid analysis suggested that the CCRS increased the proportion of delicate and sweet amino acids. The taste activity value (TAV) analysis indicated that the histidine TAV value was the strongest and had the greatest impact on sausage taste. The present study would provide a theoretical basis and technical support for enhancing the flavor quality of Chinese traditional sausages based on the metabolites of Rhodobacter sphaeroides.

In order to investigate the effect of natural air-drying on the quality and flavor of raw mustard roots, the moisture content, water activity, hardness, crispness, protein content, amino acid nitrogen content, total plate count and total lactic acid bacteria were measured and compared before and after air-drying of the raw mustard roots. The changes of volatile flavor substances were analyzed by solid-phase microextraction gas chromatography-mass spectrometry (SPME-GC-MS). The results showed that the hardness of mustard roots after natural air-drying was significantly enhanced and the crispness was reduced (P1, P

To solve the wear problem of stamping dies in high-speed machining，cathodic multi-arc ion plating is often used to improve surface properties，and the surface quality of cathode multi-arc ion plated coating is one of main factors affecting the life of stamping dies.In this paper，the effects of the DC bias voltage，flow rate of nitrogen and arc current on the surface quality of CrAlN coating were studied by the orthogonal experiments.The significance of the effects of DC bias voltage，flow rate of nitrogen and arc current on the surface quality of the CrAlN coating was analyzed by the extreme-range method and variance method.Results showed that the surface quality of the CrAlN coating was affected most significantly by the flow rate of nitrogen，and the DC bias voltage also influenced the number of large particles on the surface of the CrAlN coating.When the DC bias voltage was 160 V，the nitrogen flow rate was 1 600 mL/min，and the arc source current was 120 A，the as-prepared coating possessed the minimum number of large particles on the surface (42.5 per 10，000 μm2) and the optimal surface quality.

In order to improve the utilization rate of coal measure kaolinite gangue resources, this paper takes coal measure kaolinite in Heidaigou area of Inner Mongolia as the research object, and studies the iron and titanium removal of coal measure hard kaolinite contained in it. The process mineralogy of coal gangue was analyzed by X-ray diffraction (XRD), X-ray fluorescence (XRF), scanning electron microscope (SEM) and microscope test from the aspects of chemical composition, microstructure and mineral composition. Different magnetic species were used to conduct high-gradient magnetic separation of iron-bearing and titanium-bearing minerals, and the single-factor experiment showed that magnetite powder was superior to artificial ferrite. The orthogonal experiment shows that magnetic separation current 6 A, ore timing 20 s and slurry concentration 45% are the best experimental conditions, and the iron removal rate is 35.63% and the titanium removal rate is 39.29%. The whiteness of the final product is 80.96% after calcination, which meets the whiteness requirement of calcined kaolin used in rubber and plastic industry.

Anaplastic lymphoma kinase (ALK) fusion gene is an important tumor driver gene of non-small cell lung cancer, accounting for about 5% of patients with non-small cell lung cancer, of which 97% are patients with lung adenocarcinoma. Since the first discovery of echinoderm microtubule associated protein-like 4 (EML4)-ALK fusion in patients with lung adenocarcinoma in 2007, a variety of ALK fusion partners have been detected. CLIP1-ALK fusion gene was detected by next generation sequencing (NGS) in this patient with advanced lung squamous cell carcinoma, and Alectinib and Ensartinib were taken orally on May 5, 2021. Aletinib was effective for this patient but the patients died on September 30, 2021. This is a report of lung squamous cell carcinoma patients with CLIP1-ALK fusion gene treated with ALK inhibitors.

Basalt in the Cenozoic period in Datong, Shanxi can be divided into two types: alkaline basalt in the northwest and tholeiite basalt in the southeast. Petrological and geochemical analyses were carried out on the basalts in Datong area. As known from the differences between them, the basalt magma in the two regions come from different mantle source regions. Their respective petrology characteristics were summarized. In terms of geochemistry, Mg isotope was used as a chemical tracer to further study the magmatism process in Datong Basin. The results show that the basalt samples in both regions are micro-porphyritic, but the content and proportion of minerals such as feldspar and precious olivine vary greatly; the distribution curves of rare earth elements in the two regions are also significantly different in slope. The relative strength of the magma melting in the two regions was also compared. In addition, the Mg isotope content in Datong area is obviously low, the δ25 Mg value is between -0.36‰~-0.11‰, and the δ26 Mg value is between -0.69‰~-0.21‰, which is lighter than the normal mantle standard. From the geological and geo chemical properties of the basalt after cooling crystallization the geochemical evolution of deep mantle was inferred. The content of Mg isotopic features was used as the main research direction to discuss its genesis and determine the nature of the mantle source region. This research provides reference to understand the cause mechanism, chemical composition, and other factors of Cenozoic basalts in north China.

Objective: To investigate the depression prevalence of patients with advanced schistosomiasis, as well as their quality of life., Methods: A total of 356 patients with advanced schistosomiasis were investigated with the Self-rating Depression Scale (SDS) and SF-36 scale for their situation of depression and quality of life., Results: Among 356 cases, 306 effective questionnaires were collected. The prevalence of depression was 48.70%. The scores of 8 dimensions of SF-36 of the patients with depression were significantly lower than those of the patients without depression (all P values were less than 0.01), and there were negative correlations between SDS scores and scores of all the dimensions of SF-36 (r values were between -0.839 and -0.182, all P values were less than 0.001)., Conclusions: The prevalence of depression of patients with advanced schistosomiasis is high, and their quality of life is low. Besides active treatment, we should give more attention to their mental health.