On Zero-free Intervals of Flow Polynomials

This article studies real roots of the flow polynomial $F(G,\lambda)$ of a bridgeless graph $G$. For any integer $k\ge 0$, let $\xi_k$ be the supremum in $(1,2]$ such that $F(G,\lambda)$ has no real roots in $(1,\xi_k)$ for all graphs $G$ with $|W(G)|\le k$, where $W(G)$ is the set of vertices in $G$ of degrees larger than $3$. We prove that $\xi_k$ can be determined by considering a finite set of graphs and show that $\xi_k=2$ for $k\le 2$, $\xi_3=1.430\cdots$, $\xi_4=1.361\cdots$ and $\xi_5=1.317\cdots$. We also prove that for any bridgeless graph $G=(V,E)$, if all roots of $F(G,\lambda)$ are real but some of these roots are not in the set $\{1,2,3\}$, then $|E|\ge |V|+17$ and $F(G,\lambda)$ has at least 9 real roots in $(1,2)$.Comment: 26 pages, 7 figure

γZ\gamma Z Pair Production at the Photon Linear Collider

$\gamma\gamma\to\gamma Z$ scattering at the Photon Linear Collider is considered. Explicit formulas for helicity amplitudes due to $W$ boson loops are presented. It is shown that the $Z\gamma$ pair production will be easily observable at PLC and separation of the $W$ loop contribution will be possible at $e^+e^-$ c.m. energy of 300~GeV or higher.Comment: 9 pages of standard LaTeX + 3 PostScript figures (uuencoded and compressed

Making Dinner

In lieu of an abstract, below is the essay\u27s first paragraph. Dong . . . Dong . . . Dong . . . Dong. The clock in the living room tolled four. It was the middle of December and was beginning to get dark already. Margaret sat in the kitchen peeling potatoes for dinner, while Oprah dragged on about some book that she had read over the weekend in the background

Photon-Photon Scattering at the Photon Linear Collider

Photon-photon scattering at the Photon Linear Collider is considered. Explicit formulas for helicity amplitudes due to $W$ boson loops are presented. It is shown that photon-photon scattering should be easily observable at PLC and separation of the $W$ loop contribution (which dominates at high energies) will be possible at $e^+e^-$ c.m. energy of 500~GeV or higher.Comment: Standard LaTeX. 8 pages+5 figures (available by regular mail). IHEP 93-8

FORECASTING THE WATER QUALITY AND THE CAPACITY OF RECEIVING WASTEWATER OF THE DONG NAI RIVER UP TO 2020

Dong Nai river, the largest river system in the South East region, flows through five provinces in the South East area. Dong Nai river serves water for living, production, irrigation, aquaculture, navigation, and hydropower. It receives a huge impact from the natural and artificial elements, such as municipal wastewater from residential areas and urban centers; industrial wastewater from industrial zones, toxic wastewater from agricultural activities, etc [4, 6, 7, 12]. Therefore, the prediction of water quality change and the capacity of receiving wastewater are very essential in environmental protection for Dong Nai river. The study results showed that the water quality of Dong Nai river is currently achieved to the standard requirement and the using purposes. However, there were some sections where had locally polluted signs and had not be used (such as Dong Nai river in the section 3). Predictably up to 2020, pollutant load will increases, however, the water quality of Dong Nai river is still achieving the fundamental purpose of water supply, except TSS which, water from the area below Tri An damp to Dong Nai bridge, is not reached the regulation permit in the beginning and ending of rainy season. To protect the water of Dong Nai River, the optimal solution is necessary to collect and treat all wastewater from industrial, domestic, livestock and medical activities to get the standard permission before discharged into Dong Nai river. At the same time, considering the capacity of receiving wastewater on the each section of Dong Nai river is conducted to allow new investment projects and license of wastewater dischargement

Are white-beaked dolphins Lagenorhynchus albirostris food specialst? Their diet in the southern North Sea

The white-beaked dolphin Lagenorhynchus albirostris is the most numerous cetacean after the harbour porpoise Phocoena phocoena in the North Sea, including Dutch coastal waters. In this study, the diet of 45 white-beaked dolphins stranded on the Dutch coast between 1968 and 2005 was determined by analysis of stomach contents. Although 25 fish species were identified, the diet was dominated by Gadidae (98.0% by weight, 40.0% in numbers), found in all stomachs. All other prey species combined contributed little to the diet by weight (2.0%W). The two most important prey species were whiting Merlangius merlangus (91.1% frequency of occurrence (FO), 30.5%N, 37.6%W) and cod Gadus morhua (73.3%FO, 7.4%N, 55.9%W). In numbers, gobies were most common (54.6%N), but contributed little to the diet by weight (0.6%W). Three stomachs contained different prey compared to the others: one animal had taken 2250 gobies, accounting for 96.4% of all gobies found; one animal had fed on 29 small sepiolids; and one animal had solely taken haddock Melanogrammus aeglefinus. Squid and haddock were not found in any other stomach. The overall diet showed a lasting predominance of whiting and cod, without clear changes over time (35 years) or differences between sexes or size-classes of dolphins. This study adds to earlier published and unpublished data for Dutch coastal waters and agrees well with studies of white-beaked dolphins from other parts of the species’ range, in the North Sea and in Canadian waters, with Gadidae dominating the diet on both sides of the Atlantic

Perancangan Web-komik Wanorosingo sebagai Media Alternatif Pengenalan Wayang Cek-dong untuk Generasi Muda

Wayang Cek-Dong sebagai asal muasal wujud semua bentuk wayang purwa di Jawa, tidak mampu menyaingi wayang Jawa Tengah (Solo) baik dari segi penyebaran wilayahnya maupun jumlah penonton. Kini keberadaan wayang Purwa Gaya Jawa Timuran (Cek-Dong) sulit menarik minat generasi muda, hal itu dapat dilihat dari minimnya penonton wayang usia muda. Berbagai upaya pemerintah untuk mengenalkan dan mengembangkan wayang purwa Jawa Timuran telah dilakukan, namun masih belum dapat menuai perkembangan positif. Penelitian ini memiliki tujuan utama mencari cara yang tepat pengenalan wayang Cek-dong ke segmen 18-25 tahun yang tepat, Penelitian ini menggunakan model field research dengan pencarian sumber data menggunakan metode kuisioner, wawancara mendalam, dan observasi lapangan. Dari penelitian yang telah dilakukan penulis, berhasil menemukan formula bagaimana mendekatkan wayang Cek-dong ke generasi muda kini. Hal tersebut dapat dilakukan dengan penyesuaian elemen-elemen yang menyusun wayang Cekdong seperti cerita, karakter yang lebih kekinian ke dalam media yang dekat dengan kehidupan generasi muda saat ini. Hal tersebut disajikan sedemikian rupa dalam konsep " Kebangkitan Kemegahan Masa Lalu". Melalui media web-komik yang kini semakin berkembang, memiliki potensi untuk menjadi mediasi antara kebudayaan lokal Indonesia dan generasi muda. Diharapkan dengan adanya komik wayang Cek-Dong mampu menggugah keingintahuan generasi muda akan kebudayaan wayang Cek-Dong