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Butterflies and moths have difficulty adjusting to a rapidly changing climate
climate change biodiversity species
2021/8/4
Climate change exerts great pressure for change on species and biodiversity. A recent study indicates that the few moth and butterfly species (Lepidoptera) capable of adjusting to a changing climate b...
New method may resolve difficulty in measuring universe's expansion（图）
New method difficulty measuring universe
2019/10/23
Astronomers using National Science Foundation radio telescopes have demonstrated how a combination of gravitational-wave and radio observations, along with theoretical modeling, can turn the mergers o...
On the Difficulty of Hiding the Balance of Lightning Network Channels
Bitcoin Blockchain Network Security
2019/4/1
The Lightning Network is a second layer technology running on top of Bitcoin and other Blockchains. It is composed of a peer-to-peer network, used to transfer raw information data. Some of the links i...
Relative difficulty of understanding foreign accents as a marker of proficiency
Foreign accent L2 learners
2017/8/30
Foreign-accented speech is generally harder to understand than native-accented speech. This difficulty is reduced for non-native listeners who share their first language with the non-native speaker. I...
Revisiting Difficulty Control for Blockchain Systems
proof-of-work blockchain difficulty adjustment
2017/8/2
The Bitcoin whitepaper states that security of the system is guaranteed as long as honest miners control more than half of the current total computational power. The whitepaper assumes a static diffic...
Bitcoin’s innovative and distributedly maintained blockchain data structure hinges on the adequate degree of difficulty of so-called “proofs of work,” which miners have to produce in order for transac...
Ethnographic fieldwork can be a time of intense vulnerability for PhD students. Often alone and in an unfamiliar context, they may face challenges that their pre-fieldwork training has done little to ...
On the Difficulty of Securing Web Applications using CryptDB
CryptDB database integrity query integrity
2016/1/4
CryptDB has been proposed as a practical and secure middleware to protect databases deployed on semi-honest cloud servers. While CryptDB provides sufficient protection under Threat-1, here we demonstr...
The Difficulty With Difference in Teacher Education: Toward a Pedagogy of Compassion
Teacher Education Compassion
2015/9/24
In this article we consider possibilities for addressing the dilemmas and difficulties that often arise in preparing beginning teachers for culturally diverse classrooms. Based on our research and per...
Prior Cognitive Task Analysis of Test Item Difficulty
test item difficulty cognitive task analysis prior diffculty
2015/7/29
The pass rate of a test item often serves as an index of its difficulty. This posterior index, though easy to obtain and definite, is susceptible to students' learning level. It cannot play a leading ...
Olfactory Neuroblastoma:Diagnostic Difficulty
Olfactory neuroblastoma Nasal cavity Immunohistochemistry
2015/7/21
Olfactory neuroblastoma is an uncommon malignant tumor of sinonasal tract arising from the olfactory neuro epithelium. The olfactory neuroblastomas presenting with divergent histomorphologies like, ep...
Robustness of Lord’s Formulas for Item Difficulty and Discrimination Conversions Between Classical and Item Response Theory Models
Lord’s Formulas Item Difficulty Discrimination Conversions Between Classical Item Response Theory Models
2015/6/30
Lord (1980) proposed formulas that provide direct relationships between IRT discrimination and difficulty parameters and conventional item statistics. The purpose of the present study was to determine...
Calving difficulty as related to body weights and measurements of cows and calves in a herd of Gascon breed
beef cattle course of parturition pelvic measurements calving difficulty
2015/6/5
This study was conducted to evaluate the body weights and measurements of 86 Gascon calves and their dams. The effects of the course of parturition, parity of the dams, sex of the calves, and live- or...
Analysis of non-genetic factors affecting calving difficulty in the Czech Holstein population
calving process gestation length age at first calving preceding calving interval dairy cattle
2015/6/5
The objective of this study was to analyze the effects of non-genetic factors affecting calving difficulty in the Holstein population of the Czech Republic for subsequent compilation of the model for ...
Increased Pain Intensity Is Associated with Greater Verbal Communication Difficulty and Increased Production of Speech and Co-Speech Gestures
Increased Pain Intensity Greater Verbal Communication Difficulty Speech Co-Speech Gestures
2015/5/6
Effective pain communication is essential if adequate treatment and support are to be provided. Pain communication is often multimodal, with sufferers utilising speech, nonverbal behaviours (such as f...