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Alloy nanocrystals (NCs) provide access and control of the parameters for nanoscale engineering because their physical and optical properties depend on size, shape, and composition. Here, alloy CdS x Se1−x NCs with different shapes were synthesised via a one-pot method using cadmium acetate, sulfur, and selenium as precursors in trioctylphosphine solution. The luminescence and shapes of NCs were characterised by fluorescence spectroscopy and transmission electron microscopy, respectively. It was found that the modification of precursor concentration resulted in NC shape variation, including branched NCs, long and short nanorods. Consequently, a series of alloy CdS x Se1−x NCs with different shape-based light emitting devices (LEDs) were fabricated and their operation characteristics were also compared. The obtained luminance and luminous efficiency showed that the control of NC shape is the key factor for the improvement of LED performance. We anticipate that this work will provide further insight into the design of CdSxSe1−x NCs-based LEDs with shape variation.

Abstract. The basic fuzzy set theory, fuzzy processes and fuzzy model are described in this paper. Following this, the brief of the fuzzy logic control system with different approaches is presented. Finally we discuss the future development of the fuzzy system. LOl N6I DAUTrong m~y chuc nam trb Iai day, cung vOOst! phat tri~n khong 'ngirng cua khoa hoc ve may tinh, tri tl,le nhan tao, cac phirong phap moo ciia dieu khi~n hoc ngay cang diroc nghisn ciru va phat tri~n va d~t diroc nhirng thanh ttrU dang k~. Chung ta deu biet trong nghien cU'Ukhoa hoc, cling nhtr trong mQt s5 linh vl!c khac luon ton tai hai gia tr] logic dung -sai, no kh!ng dinh dieu d~t ra la dung hay dieu d~t ra la sai. The gi&i thuc tai khong ton t~i mQt nghia ch~c chh nhir v~y, cu thg la trong xa hQi loai ngiroi, cac suy nghi va tu' duy cua ho khong bao gier mang inQt khai niem nha:t dinh, hay noi each khac qua trinh dinh hrong trong cac nganh khoa hoc ma ta v~n dung khong sd' dung d~mo ta diroc cac suy nghi va tu duy. 0' day eo th~th~y dieu chung nha:t ciia con ngiroi la eo th~trao dO'isuy nghi va tu duy thong qua ngon ngii', vi du nhtr trOi se rmra, toi se den ... T'+'P MO' vA LOGIC MO'Tu buO'iSO' khai cda qua trinli phat tri~n, Zadeh da. chi ra r~ng: con ngiror eo kha nang phan tich nhirng va:n de khong ra rang, khong cu th~. Trong ngon ngir cua mlnh, nhirng suy nghi va tir duy diroc th€ hi~n th~t day du. Ly thuyet t~p mer ra deri phan nao t d~tinh chung bO'i x, X eo th~la lien tuc ho~rOi rac. X diroc goi la khOng gian tham chidu (vu tru] (universe of discoure), x la cac phan td-ciia X.

PPP investments have been in practice in Vietnam for more than 20 years, yet, many shortcomings and constraints have been revealed. This paper analyzes applicable legal regulations on Public-private partnership contracts of investment in Vietnam, and demonstrates barriers encountered by parties, particularly private sector, including discrepancies and non-coherence among legal documents resulting in losses, wastes of resources; absence of standard agreements/ contracts making negotiations and contract signing hard to conclude; insufficient clarity in provisions about concessioning, and responsibilities, among others. The analysis, hence, suggests how to deal with the situation by amendments, supplements to provisions on the agreements between public and private partners.

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