Study on the Influence of Inserting Clearance on the Voltage Standing Wave Ratio in RF Connector

RF (Radio Frequency) connector has been extensively applied in the field of communication for it is a key device of transmitting microwave signals. If he RF connector end is designed improperly in dimension, a clearance will be observed after inserting, resulting in an abnormal phenomenon in the voltage standing wave ratio (VSWR) of the RF connector. This paper studied the influence of the inserting clearance of RF connector on the voltage standing wave ratio through theoretical analysis and performance simulation. Moreover, the solution to the abnormal voltage standing wave ratio was also proposed. At last, the abnormal phenomenon of voltage standing wave ratio of the connector in the inserting process was handled by means of carrying out optimization design and test validation on the RF connector.

Pedestrian mortality in Russia: a continuous decline over the last 25 years?

Using different data sources (HCoD, IRTAD, UNECE statistical database, police data), our research shows that the significant excess of pedestrian mortality over motor vehicle occupant mortality in 1988-1999 in Russia, according to RusFMD, is an abnormal phenomenon that most likely never occurred. Police data is preferable for assessing mortality levels by road user types in Russia. According to Russian police data, pedestrian mortality never exceeded motor vehicle occupant mortality. The steady decline of pedestrian mortality began in 2003, not in 1993, as vital statistics show. In 2008, pedestrian mortality for the first time reached the minimum level of the Soviet period. After significant fluctuations, motor vehicle occupant mortality dropped to the level of the early 1970s only in 2015-2017. The use of vital statistics is possible if it is necessary to differentiate road traffic mortality by sex, age, and type of settlements. Categorisation by road user types should be done with caution, using the following data sources: HCoD data from 1988 and RusFMD data from 1970 to 1988 and after 1999. It is suggested that difficulties in analysing long-term mortality by road user types based on vital statistics may occur in post-Soviet countries, where the Soviet abridged classification of causes of death (SC) was used. The prevalence of deaths coded by unspecified V-codes (V89) should also be considered.

The modern epidemic of school suicides in Russia

Suicide is a profoundly abnormal phenomenon. That is why every case of him involuntarily attracts general attention even in our time, when a person's life has fallen so low in value. But if what has just been said is true in relation to suicide in general, all the more it matters when it comes to children.

RESEARCH AND DEVELOPMENT OF ONLINE-REALTIME SUPERVISING SYSTEM FOR LOW VOLTAGE GRIDS

This paper presents some results of fabrication and experiment of an online-realtime supervising system for low voltage grids. The experiment results show that, for the proposed system, important operating parameters of the low voltage grid such as voltage, current, power, temperatures of oil, cable are supervised and analyzed. Additionally, alarming messages are sent to operators immediately when there are abnormal phenomenon occurring at the grid. This proposed system can help improve reliability of electric supply and reduce SAIDI, SAIFI, as well as enhance safety of human being and equipment.

LMDI decomposition analysis of total electricity consumption growth in Hunan province

In the past decade, as an important driving force of economic growth, the China’s electricity consumption growth rate has been decoupled from GDP growth rate. The economic reasons behind this abnormal phenomenon are worthy of further study. Based on the LMDI method, this paper built a model to decompose the total electricity consumption in Hunan province from 2010 to 2017 from the industrial and residential perspective. The results showed that: integrally, scale effect was the main driving factor of electricity consumption growth, intensity effect was the main inhibiting factor, and structure effect had no obvious influence; there are significant differences between the results of industrial and residential sectors, for the industry, the productive consumption intensity effect was the most significant factor that inhibited the growth of electricity consumption, while all the effects of residential sector were shown as promotion, and the increase of electricity consumption in the residential sector played a key role in the growth rate of electricity consumption in Hunan province.

Study on Gas Drainage Technology of Opening Closed Roadway

In order to ensure the safe and rapid emission of high concentration gas when the mine opens the closed roadway, the gas emission method of the measure hole on the closed wall of the roadway and the extraction hole through the head of the roadway are studied. It solved the problems of difficult control of air volume, long gas emission time, easy overrun of return air flow gas concentration and large influence range in closed roadway gas emission. The practical results show that after the closed wall of -580 m track stone gate roadway is opened, the gas concentration in the airflow is 0.18 %, and the gas emission time is 2 min, which greatly shortens the gas emission time. There is no abnormal phenomenon in the segmented gas emission, and the safe gas emission is realized.