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Ratna EKASARI(Ratna EKASARI ),Abdul GHOFUR(Abdul GHOFUR ),Donny ARIF(Donny ARIF ) 한국유통과학회 2023 The Journal of Asian Finance, Economics and Busine Vol.10 No.1
MSMEs encountered several issues during the COVID-19 pandemic, including decreased sales and capital, difficulties in distribution, trouble obtaining raw materials, decreased production, and employee layoffs. These issues posed a threat to the national economy. The final effect was the company’s bankruptcy as a result of its failure to survive a pandemic, which led to the company’s downfall. This research aims to find out and analyze MSMEs’ business strategy and innovation to maintain their business during the COVID-19 pandemic in Indonesia. This research is qualitative. Researchers got data using interviews, observation, and documentation. The analysis of this research is descriptive. To draw customers during the COVID-19 pandemic, MSMEs use social media or digital marketing, followed by the delivery of orders, promotions, or discounts and the creation of freebies. MSMEs develop new products as part of their ongoing efforts to expand their businesses while upholding standards for quality, value, and customer service. They also adapt to changing consumer tastes and popular food trends while showcasing some of their most intriguing products.
Ratna, D.,Banthia, Ajit K. The Polymer Society of Korea 2004 Macromolecular Research Vol.12 No.1
Toughening of epoxy resins for improvement of crack resistance has been the subject of intense research interest during the last two decades. Epoxy resins are successfully toughened by blending with a suitable liquid rubber, which initially remains miscible with epoxy and undergoes a phase separation in the course of curing that leads to the formation of a two-phase microstructure, or by directly blending preformed rubbery particle. Unlike the situation for thermoplastics, physical blending is not successful for toughening epoxy resins. Recent advances in the development of various functionalized liquid rubber-based toughening agents and core-shell particles are discussed critically in this review.
Inheritance of Resistance to Nuclear Polyhedrosis Virus in Silkworm, Bombyx mori
( Ratna Sen ),( S. K. Ashwath ),( R. K. Datta ) 한국잠사학회 2001 International Journal of Industrial Entomology Vol.3 No.2
Inheritance pattern of resistance to Bombyx mori nuclear polyhedrosis virus (BmNPV) was studied in an Indian silkworm stock TX by single back-cross test method. The resistant parent [TX], susceptible parent [HM], their Fl, F2, and Fl progeny back-crossed to TX [BC(R)] and HM [BC(S)] were inoculated per os with a fixed concentration of BmNPV (0.5×10(7) PIB/ml) on the first day of second stadium. The cumulative mortality was recorded until day 10th post-inoculation. The results show that the resistance to BmNPV in TX fellow mono Mendelian inheritance pattern. The resistance dominated over the susceptibility at Fl. At F2, the resistant and susceptible offspring segregated in 3:1 ratio whereas at BC(S), the resistant and susceptible offspring segregated in 1:1 ratio. The response of BC(R) was more or less like the resistant parent TX which confirms the involvement of a major dominant gene conferring resistance to BmNPV in TX. The possible mechanism of inheritance of resistance in TX is discussed.
( Ratna Dewi Maduwu ),진호철,이준호,정미진,손동환,( Sabrina Aufar Salma ),김주현 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
A small molecule which has A1-D-A2-D-A1 type of structured consists of electron-deficient benzothiadiazole (BT) (A2) as the core, electronrich thiophene (D) and electron-deficient dicyanomethylene-4H- chromene (CMCN) (A1) moiety, BT-T-CMCN, was synthesized. BT-T- CMCN showed good thermal stability with the onset of decomposition temperatures of 304 °C at 5 wt % loss. The energy levels of the BT-T- CMCN were -5.29 eV/-3.58 eV with the optical band gap of 1.72 eV. The best performance based on BT-T-CMCN/PC71BM in inverted-type of organic solar cells (OSCs) exhibits the PCE of 0.69% with a short-circuit current density (JSC) of 2.03 mA/㎠, VOC of 0.79 V, and fill factor (FF) of 42.7%. Keywords: Organic solar cells, benzothiadiazole, dicyanomethylene-4Hchromene, 2,2'-(1H-indene-1,3(2H)-diylidene)dimalononitrile