美军ROVER V和AN-PRC-117G新型移动视频通信设备

美军2009年开始装备新型移动视频通信设备，包括两种新开发的轻型系统ROVER V和AN-PRC-117G，它能接受来自空中传感器平台的实时图像信息，允许步兵和特种作战部队通过战术通信和数据网络获取和共享视频流，从而将原有的指挥所系统和车载系统交付到连、班一级，其有较强的潜在应用能力和良好的应用前景，本文对这两种设备的技术、基本性能及其应用前景进行了介绍。

炼钢厂G117皮带更换方法优化及应用

皮带运料在转炉炼钢生产上分为平皮带运料和垂直槽型皮带运料两种.由于皮带高负荷、长时间运转、运行环境恶劣,加剧了皮带的胶面老化、断裂、磨损,而皮带的作业方法,作业效率,直接影响到转炉炼钢生产.现对G117皮带更换步骤、方法进行优化,从而缩短作业时间、提高施工效率.

The rate of period change in DAV stars

Grids of DAV star models are evolved by WDEC, taking the element diffusion effect into account. The grid parameters are hydrogen mass log（MH/M＊）, helium mass log（MHe/M＊）, stellar mass M＊and effective temperature T_（eff） for DAV stars. The core compositions are from white dwarf models evolved by MESA. Therefore, DAV star models evolved by WDEC have historically viable core compositions. Based on those DAV star models, we studied the rate of period change（P˙（k）） for different values of H, He, M_＊and Teff. The results are consistent with previous work. Two DAV stars G117-B15A and R548 have been observed for around 40 years. The rates of period change of two large-amplitude modes were obtained through the O-C method. We conducted an asteroseismological study on the two DAV stars and then obtained a best-fitting model for each star. Based on the two best-fitting models,the mode identifications（l, k） of the observed modes for G117-B15A and R548 are consistent with previous work. Both the observed modes and the observedP˙ s can be fitted by calculated ones. The results indicate that our method of evolving DAV star models is feasible.

Vaccines’ Safety and Effectiveness in the Midst of Covid-19 Mutations

We examined the coronavirus classification and evolution through its multiple mutations that have increased its transmissibility rate up to 70% globally, threatening to undermine the promise of a number of emerging vaccines that primarily focus on the immune detection of the Spike trimer. The safety and effectiveness of different vaccination methods are evaluated and compared, including the mRNA version, the Adenovirus DNA, Spike protein subunits, the deactivated virus genres, and the live attenuated coronavirus. Mutations have been long considered as random events, or mistakes during the viral RNA replication. Usually, what can go wrong will go wrong;therefore, repeated transformations lead to the extinction of a virus. On the contrary, the aggregate result of over 300,000 Covid-19 variants has expanded its transmissibility and infectiousness. Covid-19 mutations do not degrade the virus;they empower and facilitate its disguise to evade detection. Unlike other coronaviruses, Covid-19 amino acid switches do not reflect the random unfolding of errors that eventually eradicate the virus. Covid-19 appears to use mutations adaptively in the service of its survival and expansion. We cite evidence that Covid-19 inhibits the interferon type I production, compromising adaptive immunity from recognizing the virus. The deleterious consequences of the cytokine storm where the CD8+ killer cells injure the vital organs of the host may well be a Covid-19 manoeuvring to escape exposure. It is probable that evolution has programmed Covid-19 with an adeptness designed to debilitate key systemic defences to secure its subsistence. To date the infectiousness of the Covid-19 pandemic is exponentially increasing, denoting the possibility of an even more dangerously elusive, inconspicuous, and sophisticated version of the disease.

Covid-19 Mutations and the Effect of Different Vaccines on Immune Memory

We traced the coronavirus classification and evolution,analyzed the Covid-19 composition and its distinguishing characteristics when compared to SARS-CoV and MERS-CoV.Despite their close kinship,SARS-CoV and Covid-19 display significant structural differences,including 380 amino acid substitutions,and variable homology between certain open reading frames that are bound to diversify the pathogenesis and virulence of the two viral compounds.A single amino acid substitution such as replacing Aspartate(D)with Glycine(G)composes the D614G mutation that is around 20%more infectious than its predecessor 614D.The B117 variant,that exhibits a 70%transmissibility rate,harbours 23 mutants,each reflecting one amino acid exchange.We examined several globally spreading mutations,501.V2,B1351,P1,and others,with respect to the specific amino acid conversions involved.Unlike previous versions of coronavirus,where random mutations eventually precipitate extinction,the multiplicity of over 300,000 mutations appears to have rendered Covid-19 more contagious,facilitating its ability to evade detection,thus challenging the effectiveness of a large variety of emerging vaccines.Vaccination enhances immune memory and intelligence to combat or obstruct viral entry by generating antibodies that will prohibit the cellular binding and fusion with the Spike protein,restricting the virus from releasing its contents into the cell.Developing antibodies during the innate response,appears to be the most compelling solution in light of the hypothesis that Covid-19 inhibits the production of Interferon type I,compromising adaptive efficiency to recognize the virus,possibly provoking a cytokine storm that injures vital organs.With respect to that perspective,the potential safety and effectiveness of different vaccines are evaluated and compared,including the Spike protein mRNA version,the Adenovirus DNA,Spike protein subunits,the deactivated virus genres,or,finally,the live attenuated coronavirus that appears to demonstrate the greatest effectiveness,yet,encompass a relatively higher risk.