Characterization of pig farms in Hung Yen, Hai Duong and Bac Ninh provinces

peer reviewedIn order to characterization of pig farms in the Red River Delta, a study was conducted on 90 pig farms in Hung Yen, Hai Duong and Bac Ninh provinces from June to December 2006. Results show that most of the pig farms had been built for five years with a small size (0.5 hectare per farm). The invested capital was about 300-400 millions VND per farm. Four main sow groups used in the farms included crossbred exotic sows (51.1%), crossbred sow between local and exotic breeds (14.4%), purebred Landrace and Yorkshire breeds (15.6 and 18.9%, respectively). The boars were various (Duroc 30%, Yorkshire 21%, Landrace 13%, PiÐtrain × Duroc 36% and others). The pigs farms were faced with several difficulties such as limited land, lack of invested capital, uncontrolled quality of breeding pigs, high costs of feed, poor hygiene condition and diseases

A Survey on Some Parameters of Beef and Buffalo Meat Quality

A survey was carried out on 13 Vietnamese Yellow cattle, 14 LaiSind cattle and 18 buffalos in Hanoi to estimate the quality of longissimus dorsi in terms of pH, color, drip loss, cooking loss and tenderness at 6 different postmortem intervals. It was found that the pH value of longissimus dorsi was not significantly different among the 3 breeds (P>0.05), being reduced rapidly during the first 36 hours postmortem, and then stayed stable. The value was in the range that was considered to be normal. Conversely, the color values L*, a* and b* tended to increase and also stable at 36 hours postmortem, except that for LaiSind cattle at 48 hours. According to L* scale, the meat of Yellow and LaiSind cattle met the normal quality but the buffalo meat was considered to be dark cutters. The tenderness of longissimus dorsi was significantly different among the breeds (P<0.05). The value was highest at 48 hours and then decreased for LaiSind and buffalo, but for Yellow cattle the value decreased continuously after slaughtering In terms of tenderness buffalo meat and Yellow cattle meat were classified as “intermediate”, while LaiSind meat was out of this interval and classified as “tough”. Drip loss ratio was increased with the time of preservation (P<0.05). The cooking loss ratio was lowest at 12 hours and higher at the next period, but there was no significant difference among the periods after 36 hours postmotem.Peer reviewe

Characterization of graphs whose a small power of their edge ideals has a linear free resolution

Let $I(G)$ be the edge ideal of a simple graph $G$. We prove that $I(G)^2$ has a linear free resolution if and only if $G$ is gap-free and reg$I(G) \le 3$. Similarly, we show that $I(G)^3$ has a linear free resolution if and only if $G$ is gap-free and reg$I(G) \le 4$. We deduce these characterizations from a general formula for the regularity of powers of edge ideals of gap-free graphs $${\rm reg}(I(G)^s) = \max({\rm reg} I(G) + s-1,2s),$$ for $s =2,3$.Comment: 14 pages. Update a proof of Theorem 2.13 with a statement for a squarefree monomial ideal. arXiv admin note: text overlap with arXiv:2109.0639

EVOLUTION OF THE HOTEL BUSINESS SECTOR AND SUSTAINABLE TOURISM DEVELOPMENT IN HOTEL BUSINESS: A STUDY IN VIETNAM

In tandem with the global expansion of the hotel industry, the hotel business market in Vietnam is also experiencing significant growth, occupying a pivotal position in the country's economy. According to UNWTO, Vietnam is ranked 6th out of 10 countries with the highest tourist growth rate worldwide, and it has been selected as a leading tourist destination in Asia by WTA. However, this rapid growth comes with adverse effects on resource, environmental, and cultural concerns. These manifestations signify unsustainable development. Consequently, the need for sustainable tourism development, specifically green tourism, has become an imperative requirement. This demands concerted efforts from the Vietnamese tourism industry as a whole and tourism enterprises, including hotels, to achieve this goal. This article delves into the realm of green tourism development and its application within the hotel business sector in Vietnam

Regularity of integral closures of edge ideals of weighted oriented graphs

We prove that the regularity cannot increase when taking the integral closure for edge ideals of arbitrary weighted oriented graphs

Logistics Cost Modeling in Strategic Benchmarking Project : cases: CEL Consulting & Cement Group A

This thesis deals with logistics cost modeling for a benchmarking project as consulting service from CEL Consulting for Cement Group A. The project aims at providing flows and cost comparison of bagged cement of all cement players to relevant markets in Indonesia. The results of the project yielded strategic elements for Cement Group A in planning their penetration strategy with new investments. Due to the specific needs, Cement Group A requested a flexible costing approach taking into account market factors reflecting Indonesian logistics conditions. Such requirement, however, needs a tailor-made approach for cost modeling. Consequently, the cost model conducted for that objective became an essential key element of the project, besides other general activities and studies. The thesis emphasizes the conducting process of the cost model and discusses relevant issues. The method used in this thesis is inductive reasoning within a holistic case study. Field survey as a primary technique combines qualitative and quantitative data collection and analysis procedures. It is worth noticing that a contextual framework is designed as modeling approach facilitating the cost modeling building process. The central feature of this thesis is the architecture of the cost model represented by the excel-based model with road, sea and rail modules, which includes different costing processes, components and key drivers. The thesis is arranged similarly to modeling steps: starting with pre-configuration to determine that transport and warehousing are key activities for costing in this benchmarking project; then moving to the configuration phase where the model’s modules are filled up with relevant costing; and finally ending up with main outputs as model applications. Transport and warehousing are taken for costing as they represent the major costs of total logistics cost concept. Mapping the flows and calculating relevant cost using activity-based method is the basic costing procedure. CEL has practically implemented the model to deliver results for the project. Full upgrading to software has been drawn as recommendations for improvement.The thesis work contains this thesis report and a Excel-based cost model, which is copyright by the author, the co-authors and CEL Consulting and not be shown in public in any mean without further approval by all the related parties

Depth of powers of edge ideals of cycles and trees

Let $I$ be the edge ideal of a cycle of length $n \ge 5$ over a polynomial ring $S = \mathrm{k}[x_1,\ldots,x_n]$. We prove that for $2 \le t < \lceil (n+1)/2 \rceil$, $$\operatorname{depth} (S/I^t) = \lceil \frac{n -t + 1}{3} \rceil.$$ When $G = T_{\mathbf{a}}$ is a starlike tree which is the join of $k$ paths of length $a_1, \ldots, a_k$ at a common root $1$, we give a formula for the depth of powers of $I(T_{\mathbf{a}})$