Subjects: Geosciences >> Geography submitted time 2024-03-01 Cooperative journals: 《干旱区研究》
Abstract： To address the challenges of fresh water shortage and soil quality decline in northern Xinjiang, a field experiment was conducted, investigating the effects of different irrigation water salinity levels and biochar application on the soil hydrothermal conditions, soil salinity, and cotton growth in cotton fields. Four biochar application levels (B0: 0 t·hm- 2, B1:20 t·hm- 2, B2:40 t·hm- 2, B3:60 t·hm- 2) and three irrigation water salinitylevels (S1:1 g·L- 1, S2:3 g·L- 1, S3:5 g·L- 1) were established. A two-factor completely randomized combination test was used to analyze the effects of these treatments on soil water and salt temperature distribution, cotton growth index, dry matter accumulation, yield, and water use efficiency. The findings indicated that increased biochar and irrigation water salinity levels raised soil water and salt content. Higher biochar application increased the average soil temperature, while irrigation water salinity notably influenced the average soil temperature (P <0.01). B2S2 treatment increased the cotton plant height, leaf area index, and aboveground dry matter. Optimal yield and water use efficiency occurred in the B2S2 treatment. In contrast, the B0S3 treatment displayed the lowest values, 18.50% and 26.87% lower in yield and water use efficiency, respectively, compared to the B2S2 treatment. A multiple regression equation, combined with normalization and spatial analysis, was established. The optimal biochar amount and irrigation water salinity range based on cotton yield and water use efficiency were 26-46 t·hm-2 and 2.45-3.04 g·L-1, respectively.
Subjects: Information Science and Systems Science >> Systematic Application of Information Technology submitted time 2022-10-26 Cooperative journals: 《桂林电子科技大学学报》
Abstract： The rise of a new generation of information technology and the rapid development of the internet industry have led
to an explosive growth in the amount of data. In order to meet the needs of billions of users to obtain effective information
from massive data quickly, it is of great significance to improve the retrieval quality and query efficiency of search engines,
but it also faces challenges. On the one hand, the query words of users are becoming more and more complex, and the characteristics
of the morphological variation of language vocabulary lead to the diversification of search words, while existing
stemming algorithms generally suffer from under stemming and unsatisfactory stemming accuracy; On the other hand, it is
a very time-consuming task to retrieve document results that meet user query requirements from massive data, and existing
methods of dividing documents into multiple servers to handle query latency often suffer from tail latency problems. In view
of the above problems, in the text preprocessing stage, the word form normalization algorithm APS (advanced porter stemmer)
is designed, the rule function is recoded, and the feature word extraction is optimized; In the related ranking stage, the
anytime ranking algorithm SAR (SAAT anytime ranking) is designed based on the score-at-a-Time query processing strategy,
which can terminate the query process in advance after a given time budget or processing a specified number of inverted
segments and control the query delay effectively. Experiments are carried out on multiple real datasets to verify the effectiveness of the APS algorithm in improving the accuracy of stemming and the authenticity of the SAR algorithm in controlling
query latency.
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