The transfer matrix method for modal analysis of cracked multistep beam - Vu Thi An NinhIn the present paper a simplified version of the transfer matrix method has been developed for modal analysis of multiple cracked stepped beam based on an explicit expression of mode shape of multiple cracked uniform beam element. The simplification consists of that the beam state needs to be transferred only through steps of beam but not over t...
14 trang | Chia sẻ: honghp95 | Ngày: 01/12/2020 | Lượt xem: 651 | Lượt tải: 0
Effect of the carbonization and activation processes on the adsorption capacity of rice husk activated carbonThe effect of process parameters on the I and MB adsorption capacity have been investigated. The results showed that temperature and retention time of the carbonization and activation process effect significantly to the adsorption capacity. Based on the experimental data, the best conditions were identified for carbonization as temperature of 50...
9 trang | Chia sẻ: honghp95 | Ngày: 01/12/2020 | Lượt xem: 492 | Lượt tải: 0
Fabrication and experiment of an electrical generator for sea wave energy - Nguyen Van HaiIn present paper, we show some results in fabrication and experiment of the electrical generator for sea wave energy. The device works in the vertical direction of sea waves, its generator part is fixed on the bottom of the sea in order to overcome the impact of sea storms as it operates at the sea. The output power of the device is generated up...
13 trang | Chia sẻ: honghp95 | Ngày: 01/12/2020 | Lượt xem: 544 | Lượt tải: 0
Membrane scaling during seawater desalination by direct contact membrane distillationResults from this study demonstrate notable influence of increased feed salinity and membrane scaling on water flux at high water recoveries during the DCMD process of seawater. At water recoveries above 50 %, significant impacts of temperature and concentration polarization effects on water flux were observed, resulting in noticeable deviati...
8 trang | Chia sẻ: honghp95 | Ngày: 01/12/2020 | Lượt xem: 498 | Lượt tải: 0
Synthesis and characterization of polythiophenes from hydrazone derivatives sidegroups - Vu Quoc TrungWe have successfully synthesized a new class of irregioregular polythiophene with hydrazine derivatives sidegroups using the chemical oxidative coupling reaction. Amorphous morphology affected by the irregular structure of the main polymer chain was confirmed by SEM observations. Based the TGA analysis, these polymers exhibit good stability, ...
6 trang | Chia sẻ: honghp95 | Ngày: 01/12/2020 | Lượt xem: 422 | Lượt tải: 0
Electrochemical properties of LiNi0.8Co0.1Mn0.1O2 synthesized by sol-Gel and co-precipitation methods - Mai Thanh TungIn conclusion, we reported high capacity nickelbased LiNi0.8Co0.1Mn0.1O2 cathode materials synthesized by sol–gel and co-precipitation methods. The effects of different synthesis methods on the crystal structure, morphology, and electrochemical properties of the materials have been investigated. The two samples prepared by the different method...
6 trang | Chia sẻ: honghp95 | Ngày: 01/12/2020 | Lượt xem: 504 | Lượt tải: 0
High-Energy ball milling preparation of La0.7Sr0.3MnO3 and (Co,Ni)Fe2O4 nanoparticles for microwave absorption applicationsWe have demonstrated a method of using a high energy mill in combination with conventional solid state reaction synthesis and post-milling heat treatments for fabricating oxide nanoparticles. High quality nanoparticles could be obtained by employing appropriate post-milling heat treatments. This method can produce a large amount of nanoparti...
6 trang | Chia sẻ: honghp95 | Ngày: 01/12/2020 | Lượt xem: 485 | Lượt tải: 0![Structures of 2,5-Diaryl- and 2,3,5,6-tetra[3,2-b]thiophene synthesized by the palladium-catalyzed Suzuki-Miyaura cross-coupling reaction](https://s2.tai-lieu.com/pwz9k16xr4jr01yq7rzg033izykdsbez/thumb/2020/12/03/structures-of-25-diaryl-and-2356-tetra32-bthiophene-synthesi_OScOLhVNf0.jpg)
Structures of 2,5-Diaryl- and 2,3,5,6-tetra[3,2-b]thiophene synthesized by the palladium-catalyzed Suzuki-Miyaura cross-coupling reactionIn conclusion, the crystal structures of a 2,5- diaryl- and a 2,3,5,6-tetraayl derivatives of thieno[3,2-b]thiophene were recorded and analyzed. The results showed that the phenyl rings introduced into the thieno[3,2-b]thiophene core structure undergo a degree of rotation from 30.94 to 66.56 . In addition, π π stacking is the dominant arrang...
6 trang | Chia sẻ: honghp95 | Ngày: 01/12/2020 | Lượt xem: 480 | Lượt tải: 0
Nghiên cứu chế tạo vật liệu cao su nanocompozit trên cơ sở blend cao su thiên nhiên với cao su cloropren gia cường ống nano cacbon bằng phương pháp bán khôBằng các phƣơng pháp trộn hợp CNT với CSTN (trong dung dịch với dung môi toluen và latex CSTN với sự có mặt của chất hoạt động bề mặt CTAB) làm chất chủ rồi phối trộn với CR và các phụ gia trong máy trộn kín đã phân tán đƣợc CNT đều đặn trong nền cao su blend CSTN/CR. Hàm lƣợng tối ƣu của CNT trong blend CSTN/CR (70/30) là 3 %. Tại hàm lƣợng...
5 trang | Chia sẻ: honghp95 | Ngày: 01/12/2020 | Lượt xem: 750 | Lượt tải: 0
Thành phần hóa học và hoạt tính gây độc tế bào của lá cây Vót dạng cơm cháy Viburnum sambucinum (Caprifoliaceae)Từ cặn chiết EtOAc lá cây Vót dạng cơm cháy chúng tôi đã phân lập và thử hoạt tính gây độc tế bào của 10 hợp chất. Kết quả thử hoạt tính gây độc tế bào cho thấy hợp chất 1 và 3 có hoạt tính mạnh trên cả 4 dòng tế bào ung thƣ thử nghiệm. Đây là 2 hợp chất tritecpenoid nordammarane ít gặp trong tự nhiên. Các hợp chất phân lập từ cặn ethyl aceta...
6 trang | Chia sẻ: honghp95 | Ngày: 01/12/2020 | Lượt xem: 687 | Lượt tải: 0
